CN101493571B - Zoom lens and image pickup apparatus equipped with same - Google Patents

Zoom lens and image pickup apparatus equipped with same Download PDF

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Publication number
CN101493571B
CN101493571B CN2009100023534A CN200910002353A CN101493571B CN 101493571 B CN101493571 B CN 101493571B CN 2009100023534 A CN2009100023534 A CN 2009100023534A CN 200910002353 A CN200910002353 A CN 200910002353A CN 101493571 B CN101493571 B CN 101493571B
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lens
zoom
zoom lens
lens unit
wide
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CN101493571A (en
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左部校之
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Olympus Corp
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Olympus Imaging Corp
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Priority claimed from JP2008001661A external-priority patent/JP2009163068A/en
Priority claimed from JP2008001640A external-priority patent/JP5075644B2/en
Priority claimed from JP2008001649A external-priority patent/JP5075645B2/en
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Abstract

The present invention provides a zoom lens and an image pickup apparatus equipped with the same. The zoom lens includes, in order from the object side thereof, a first lens unit G1 having a positive refracting power, a second lens unit G2 having a negative refracting power, and a third lens unit G3 having a positive refracting power, wherein zooming is performed by changing distances between the lens units, the second lens unit has two negative lens elements and one positive lens element, and the lens element located closest to the object side is a negative lens element. The zoom lens satisfies the following conditions: 0.60<Sigmad2G/Imw<1.95 (1-1) and 1.830<N2ave<2.000 (1-2) where the term 'lens element' refers to an optical member that satisfies 0.1<L/Imw.

Description

Zoom lens and the image pick-up device that is equipped with these zoom lens
Technical field
The present invention relates to zoom lens and the image pick-up device that is equipped with these zoom lens.
Background technology
In recent years, use the digital camera that picks up subject image such as the image pick-up element of CCD or cmos sensor to replace film camera and become main flow.In addition, developed the digital camera of the plurality of classes of the advanced types video camera that uses from the miniature camera of popular price to the professional.The present invention especially is absorbed in this classification of miniature camera of popular price.
The user of the digital camera of this popular price usually hopes at any time to enjoy in the various shot region (shooting situation) Anywhere easily and simple shooting.Reason for this reason, these users like small-sized digital camera, especially less at thickness direction and the video camera that can in pocket or bag, carry easily.Therefore, need the size of capture lens system further to dwindle.On the other hand, the pixel quantity of image pick-up element increases, and the more high optical property that need match with the increase of image pick-up element pixel quantity.In addition, for the ease of a large amount of productions, must make that the degeneration of optical property is very little to the sensitivity of making and assembling the manufacturing mistake that occurs during the camera lens.Have 5 to 7 or the zoom lens of bigger high zoom ratios catch on because they can be used for the more shot region of wide range of types.When needs further increase zoom ratio, also need increase field angle.In order to satisfy these needs, various types of zoom-lens systems have been developed.
As prior art; The higher relatively compact zoom lens of zoom ratio that has known type promptly comprises first lens unit, second lens unit with negative index with positive refractive index in order, has the 3rd lens unit of positive refractive index and has the zoom lens of the 4th lens unit of positive refractive index from its thing side.Such zoom lens are open in following patent documentation.
Patent documentation 1: TOHKEMY 2006-171055 communique,
Patent documentation 2: japanese kokai publication hei 11-52244 communique,
Patent documentation 3: japanese kokai publication hei 11-6958 communique,
Patent documentation 4: japanese kokai publication hei 8-271788 communique,
Patent documentation 5: TOHKEMY 2005-326743 communique and
Patent documentation 6: TOHKEMY 2005-78979 communique.
Yet disclosed zoom lens are inappropriate for the size of dwindling zoom lens in the document 1, because the whole length of lens combination is very big.In document 2 to 4 in the disclosed zoom lens, be approximately 60 degree in the field angle of wide-angle side, and they do not have good performance in the angle of aberration.Disclosed zoom lens have and are approximately 5 zoom ratio in the document 5 and 6, and this is not enough big.We can say that these zoom-lens system neither ones are the whole length of balance zoom ratio, optical property and lens well.
Summary of the invention
Consider that the problems referred to above make the present invention; The purpose of this invention is to provide a kind of zoom lens and device; Its help realizing more high zoom ratios and more Wide-angle to satisfy the user for than the needs of a broader category of shot region in the past; Be suitable for using, and realize the preferable image quality with having no problem with the electronic image pickup device of for example CCD or cmos sensor.
Zoom lens according to the first kind of the present invention comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom,
Said second lens unit comprises two negative lens elements and a positive element, and in said second lens unit is negative lens element near the lens element of thing side, and
The said zoom lens expression formula that meets the following conditions:
0.60＜∑d 2G/I mw＜1.95…(1-1)
1.830＜N 2ave＜2.000…(1-2)
∑ d wherein 2GBe the thickness of said second lens unit on optical axis, I MwBe the maximum image height degree of the wide-angle side of said zoom lens, and N 2aveBe all lens elements in said second lens unit to the mean value of the refractive index of d line, wherein, term " lens element " refers to satisfy 0.1＜L/I MwOptics, wherein L is the thickness of optics on optical axis of said second lens unit.
Zoom lens according to second type of the present invention comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom,
Said first lens unit comprises a negative lens element and at least one positive element, and
The said zoom lens expression formula that meets the following conditions:
2.00＜nd 1n＜2.30…(2-1)
13.0＜vd 1n＜30.0…(2-2)
Nd wherein 1nBe negative lens element in said first lens unit to the refractive index of d line, and vd 1nIt is the Abbe number of the negative lens element in said first lens unit.
Zoom lens according to the 3rd type of the present invention comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom, and
Said second lens unit comprises at least one positive element of the expression formula that meets the following conditions:
-0.50＜f 2/f t＜-0.03…(3-1)
2.00＜nd 2p＜2.30…(3-2)
13.0＜vd 2p＜30.0…(3-3)
F wherein 2Be the focal length of said second lens unit, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end, nd 2pBe positive element in said second lens unit to the refractive index of d line, and vd 2pIt is the Abbe number of the positive element in said second lens unit.
Zoom lens according to the 4th type of the present invention comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom,
Said first lens unit is made up of a negative lens element and a positive element, and
The said zoom lens expression formula that meets the following conditions:
0.1＜f 1/f t＜1.05…(4-1)
1.70＜nd 1p＜2.20…(4-2)
F wherein 1Be the focal length of said first lens unit, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and nd 1pBe that positive element in said first lens unit is to the refractive index of d line.
Description of drawings
Figure 1A to 1E be according to the zoom lens of first embodiment of the invention therein zoom lens respectively in wide-angle side (Figure 1A), at the first middle focal length state (Figure 1B), at zoom state (Fig. 1 C) in the middle of second, at zoom state (Fig. 1 D) in the middle of the 3rd with taking the photograph far-end (Fig. 1 E) and focus on the sectional view under the state on the object point at infinity;
Fig. 2 A is to be similar to illustrate the sectional view according to the zoom lens of second embodiment of the invention of Figure 1A to 1E to 2E;
Fig. 3 A is to be similar to illustrate the sectional view according to the zoom lens of third embodiment of the invention of Figure 1A to 1E to 3E;
Fig. 4 A is to be similar to illustrate the sectional view according to the zoom lens of four embodiment of the invention of Figure 1A to 1E to 4E;
Fig. 5 A is to be similar to illustrate the sectional view according to the zoom lens of fifth embodiment of the invention of Figure 1A to 1E to 5E;
Fig. 6 A is to be similar to illustrate the sectional view according to the zoom lens of sixth embodiment of the invention of Figure 1A to 1E to 6E;
Fig. 7 A is to be similar to illustrate the sectional view according to the zoom lens of seventh embodiment of the invention of Figure 1A to 1E to 7E;
Fig. 8 A is to be similar to illustrate the sectional view according to the zoom lens of eighth embodiment of the invention of Figure 1A to 1E to 8E;
Fig. 9 A is to be similar to illustrate the sectional view according to the zoom lens of nineth embodiment of the invention of Figure 1A to 1E to 9E;
Figure 10 A is to be similar to illustrate the sectional view according to the zoom lens of tenth embodiment of the invention of Figure 1A to 1E to 10E;
Figure 11 A is to be similar to illustrate the sectional view according to the zoom lens of eleventh embodiment of the invention of Figure 1A to 1E to 11E;
Figure 12 A is to be similar to illustrate the sectional view according to the zoom lens of twelveth embodiment of the invention of Figure 1A to 1E to 12E;
Figure 13 A is to be similar to illustrate the sectional view according to the zoom lens of thirteenth embodiment of the invention of Figure 1A to 1E to 13E;
Figure 14 A is to be similar to illustrate the sectional view according to the zoom lens of fourteenth embodiment of the invention of Figure 1A to 1E to 14E;
Figure 15 A is to be similar to illustrate the sectional view according to the zoom lens of fifteenth embodiment of the invention of Figure 1A to 1E to 15E;
Figure 16 A, 16B and 16C be according to the zoom lens of first embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 17 D and 17E be according to the zoom lens of first embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 18 A, 18B and 18C be according to the zoom lens of second embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 19 D and 19E be according to the zoom lens of second embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 20 A, 20B and 20C be according to the zoom lens of the 3rd embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 21 D and 21E be according to the zoom lens of the 3rd embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 22 A, 22B and 22C be according to the zoom lens of the 4th embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 23 D and 23E be according to the zoom lens of the 4th embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 24 A, 24B and 24C be according to the zoom lens of the 5th embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 25 D and 25E be according to the zoom lens of the 5th embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 26 A, 26B and 26C be according to the zoom lens of the 6th embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 27 D and 27E be according to the zoom lens of the 6th embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 28 A, 28B and 28C be according to the zoom lens of the 7th embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 29 D and 29E be according to the zoom lens of the 7th embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 30 A, 30B and 30C be according to the zoom lens of the 8th embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 31 D and 31E be according to the zoom lens of the 8th embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 32 A, 32B and 32C be according to the zoom lens of the 9th embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 33 D and 33E be according to the zoom lens of the 9th embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 34 A, 34B and 34C be according to the zoom lens of the tenth embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 35 D and 35E be according to the zoom lens of the tenth embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 36 A, 36B and 36C be according to the zoom lens of the 11 embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 37 D and 37E be according to the zoom lens of the 11 embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 38 A, 38B and 38C be according to the zoom lens of the 12 embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 39 D and 39E be according to the zoom lens of the 12 embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 40 A, 40B and 40C be according to the zoom lens of the 13 embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 41 D and 41E be according to the zoom lens of the 13 embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 42 A, 42B and 42C be according to the zoom lens of the 14 embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 43 D and 43E be according to the zoom lens of the 14 embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 44 A, 44B and 44C be according to the zoom lens of the 15 embodiment therein zoom lens focus on the aberration diagram under the state on the object point of unlimited distance;
Figure 45 D and 45E be according to the zoom lens of the 15 embodiment therein zoom lens focus on another aberration diagram under the state on the object point of unlimited distance;
Figure 46 is the figure that distortion correction is shown;
Figure 47 illustrates the front elevation that is equipped with according to the outward appearance of the digital camera of zoom lens of the present invention;
Figure 48 is the rear view of said digital camera;
Figure 49 is the sectional view of said digital camera; With
Figure 50 is the block diagram of internal circuit of the major part of said digital camera.
Embodiment
Zoom lens according to a first aspect of the invention comprise from its thing side in order: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index; Wherein carry out zoom through the distance that changes between these lens units; Second lens unit has two negative lens elements and a positive element; In second lens unit is negative lens element near the lens element of thing side, and these zoom lens expression formula that meets the following conditions:
0.60＜∑d 2G/I mw＜1.95…(1-1)
1.830＜N 2ave＜2.000…(1-2)
∑ d wherein 2GBe the thickness of second lens unit on optical axis, I MwBe the maximum image height degree of the wide-angle side of zoom lens, and N 2aveBe all lens elements in second lens unit to the mean value of the refractive index of d line, wherein term " lens element " refers to satisfy 0.1＜L/I MwOptics, wherein L is the thickness of optics on optical axis of second lens unit.
Below, with describing reason and the advantage thereof that adopts said structure why.
In the structure that first aspect present invention adopts; Zoom lens comprise by the order from the thing side: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index; And, carry out zoom through the distance that changes between these lens units.Through this structure, the convergent-divergent variation that between lens unit, disperseed (or sharing) effectively makes that thus the variation of aberration is less during zoom.In addition, prevented that the mobile quantitative change of each lens unit is big, this makes the optical system miniaturization.
In addition, through negative index being distributed to two negative lens elements, can second lens unit be designed to have higher relatively negative index.
Lens unit up front has in the zoom lens of type of positive refractive index, and second lens unit with negative index is often very big along the thickness of optical axis.The increase of the thickness of second lens unit on optical axis possibly make the diameter of the lens unit of winning increase.Consider this situation, make second lens unit thin as much as possible in order to make lens unit thinner and littler at thickness direction under the state that lens barrel folds, to it is highly important that in diametric(al).Specifically, the expression formula (1-1) that preferably satisfies condition.If do not surpass the upper limit of conditional expression (1-1), prevented that then the thickness of second lens unit on optical axis from becoming excessive, this helps the size of reducing glass system.If do not surpass the lower limit of conditional expression (1-1), prevented that then the thickness of lens from becoming too small, and therefore needed refractive index is provided easily.In addition, the manufacturing of lens (or processing) becomes easily, and this makes it possible to reduce the manufacturing cost of lens.
Comprise first lens unit in the zoom lens structure, have second lens unit of negative index and have under the situation of the 3rd lens unit of positive refractive index with positive refractive index; If when making size less, make field angle bigger, then need second lens unit to have the strong refraction rate.On the other hand, in order to make the thickness of second lens unit littler, must reduce the thickness of each lens element in second lens unit and make that the paraxial radius-of-curvature of each lens surface is bigger.Yet this makes second lens unit be difficult to have needed refractive index.If select the glass material of the lens element in second lens unit so that each lens element has high index of refraction by the mode of the expression formula that satisfies condition (1-2), the thickness of then having realized simultaneously reducing and enough multiplying powers.
The increase of the negative index of second lens unit makes the paraxial radius-of-curvature of negative lens element to reduce.The spherical aberration in far-end and knee, visual field and the coma aberration (coma) of wide-angle side are especially taken the photograph in the increase that reduces to cause a last aberration and off-axis aberration of the paraxial radius-of-curvature of the negative lens element in second lens unit, and this is unwelcome.Can increase the paraxial radius-of-curvature of the negative lens element in second lens unit through the refractive index that increases negative lens element.In order to obtain good aberration characteristic through the aberration characteristic of eliminating negative lens element and positive element; The glass material of selecting positive element as follows is desirable: it is compared with the glass material of negative lens element, have bigger refractive index and Geng Gao dispersity.In this article, if therefore the expression formula that satisfies condition (1-2) then can make that aberration amount is minimum so that the paraxial radius-of-curvature of the negative lens element in second lens unit is bigger.
For above-mentioned reason, design zoom lens through mode by the expression formula that satisfies condition (1-2), can easily provide have wide visual field angle, the compact optical system of high zoom ratios and favorable optical performance.
More preferably, the top conditional expression that provides (1-1) is revised as following conditional expression (1-1 '), and satisfies this amended conditional expression (1-1 '):
0.90＜∑d 2G/I mw＜1.80…(1-1’)。
In addition, more preferably, conditional expression (1-1) is revised as following conditional expression (1-1 "), and satisfies this further amended conditional expression (1-1 "):
1.30＜∑d 2G/I mw＜1.60…(1-1”)。
Only the upper limit of conditional expression (1-1) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-1 ') or (1-1 ").
More preferably, the top conditional expression that provides (1-2) is revised as following conditional expression (1-2 '), and satisfies this amended conditional expression (1-2 '):
1.840＜N 2ave＜1.965…(1-2’)。
In addition, more preferably, conditional expression (1-2) is revised as following conditional expression (1-2 ") and satisfies this further amended conditional expression (1-2 "):
1.855＜N 2ave＜1.930…(1-2”)。
Only the upper limit of conditional expression (1-2) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-2 ') or (1-2 ").
Preferably, can select the multiplying power of second lens unit by the mode of the expression formula that meets the following conditions:
0.02＜|f 2/f t|＜0.05…(1-3)
Wherein, f 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
This conditional expression relates to balance or the compromise between dimension shrinks and the aberration correction.
If do not surpass the upper limit of conditional expression (1-3), prevented that then the multiplying power of second lens unit from dying down, and prevented that the size of whole lens combination from becoming big.If surpass the lower limit of conditional expression (1-3), then prevented the multiplying power grow of second lens unit, this helps reducing off-axis aberration that produces in wide-angle side and the spherical aberration of taking the photograph the far-end generation.
More preferably, the top conditional expression that provides (1-3) is revised as following conditional expression (1-3 '), and satisfies this amended conditional expression (1-3 '):
0.05＜|f 2/f t|＜0.31…(1-3’)。
In addition, more preferably, conditional expression (1-3) is revised as following conditional expression (1-3 "), and satisfies this further amended conditional expression (1-3 "):
0.09＜|f 2/f t|＜0.16…(1-3”)。
Only the upper limit of conditional expression (1-3) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-3 ') or (1-3 ").
In order to make the size of second lens unit less, preferably, the expression formula that meets the following conditions (1-4) and (1-5):
-0.65＜f 2/R 22f＜0.35…(1-4)
-0.65＜f 2/R 23r＜0.35…(1-5)
F wherein 2Be the focal length of second lens unit, R 22fBe the paraxial radius-of-curvature of second in second lens unit near the thing side surface of the lens element of thing side, R 23rBe the paraxial radius-of-curvature of the 3rd in second lens unit near the picture side surface of the lens element of thing side.
If do not surpass the upper limit of conditional expression (1-4), prevented that then the paraxial curvature on associated lens surface from becoming big on negative direction.Therefore, the concavity of lens can not deepen, and has prevented that the thickness of second lens unit from becoming big.In addition, can prevent Petzval and deterioration.
If do not surpass the lower limit of conditional expression (1-4), prevented that then the paraxial curvature on associated lens surface from becoming big on positive dirction.At this lens element is under the situation of positive element, has prevented that the thickness of lens element from becoming big so that the adequate thickness at rims of the lens place to be provided, and has prevented that thus the thickness of second lens unit from becoming big.At this lens element is under the situation of negative lens element, has prevented the deficiency of negative index, and obtains enough refractive indexes.
If do not surpass the upper limit of conditional expression (1-5), prevented that then the paraxial curvature on associated lens surface from becoming big on negative direction.At this lens element is under the situation of positive element, has prevented that lens thickness from becoming big so that the adequate thickness at rims of the lens place to be provided, and has prevented that thus the thickness of second lens unit from becoming big.At this lens element is under the situation of negative lens element, has prevented the deficiency of negative index, and obtains enough refractive indexes.If do not surpass the lower limit of conditional expression (1-5), prevented that then the paraxial curvature on associated lens surface from becoming big on positive dirction.Therefore, the concavity of lens can not deepen, and has prevented that the thickness of second lens unit from becoming big.
More preferably, the top conditional expression that provides (1-4) is revised as following conditional expression (1-4 ') and satisfies this amended conditional expression (1-4 '):
-0.45＜f 2/R 22f＜0.19…(1-4’)。
In addition, more preferably, conditional expression (1-4) is revised as following conditional expression (1-4 ") and satisfies this further amended conditional expression (1-4 "):
-0.2＜f 2/R 22f＜0.1…(1-4”)。
Only the upper limit of conditional expression (1-4) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-4 ') or (1-4 ").
More preferably, the top conditional expression that provides (1-5) is revised as following conditional expression (1-5 ') and satisfies this amended conditional expression (1-5 '):
-0.45＜f 2/R 23r＜0.25…(1-5’)。
In addition, more preferably, conditional expression (1-5) is revised as following conditional expression (1-5 ") and satisfies this further amended conditional expression (1-5 "):
-0.25＜f 2/R 23r|＜-0.03…(1-5”)。
Only the upper limit of conditional expression (1-5) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-5 ') or (1-5 ").
In must optimal design second lens unit near the shape of the negative lens element of thing side, to be distributed to its two lens surfaces and enough refractive indexes to be provided and to keep favourable aberration state through under the situation of well balanced, bearing multiplying power.Specifically, the expression formula (1-6) that preferably meets the following conditions:
0.4＜SF 21＜1.5…(1-6)
SF wherein 21By SF 21=(R 21f+ R 21r)/(R 21f-R 21r) definition, R 21fBe in second lens unit near the paraxial radius-of-curvature of the thing side surface of the negative lens element of thing side, R 21rBe in second lens unit near the paraxial radius-of-curvature of the picture side surface of the negative lens element of thing side.
If do not surpass the upper limit of conditional expression (1-6), then obtain enough negative multiplying powers, and the amount of movement of second lens unit during zoom can be not excessive, this helps making that the size of optical system is less.In addition, the effect of refracted ray can not reduce on the thing side surface.Therefore, prevented that the light height in first lens unit from becoming big.This helps reducing in diametric size.If do not surpass the lower limit of conditional expression (1-6), prevented that then the paraxial curvature of the thing side surface of this lens element from becoming big.This helps proofreading and correct rightly in the bending of the visual field of wide-angle side.
More preferably, the top conditional expression that provides (1-6) is revised as following conditional expression (1-6 ') and satisfies this amended conditional expression (1-6 '):
0.60＜SF 21＜1.20…(1-6’)。
In addition, more preferably, conditional expression (1-6) is revised as following conditional expression (1-6 ") and satisfies this further amended conditional expression (1-6 "):
0.84＜SF 21＜0.96…(1-6”)。
Only the upper limit of conditional expression (1-6) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-6 ') or (1-6 ").
In order to obtain the further improvement of optical property, preferably, at least one negative lens element in second lens unit has aspheric surface.When will with zoom lens design when having small size, high zoom ratios and wide visual field angle, needing second lens unit have strong negative multiplying power, this causes producing a large amount of negative aberrations.If use aspheric surface at least one negative lens element in second lens unit, aberration correction advantageously then.Through in second lens unit, using aspheric surface near the thing side surface of the negative lens element of thing side with as in the side surface one or two, coma aberration and the visual field that can advantageously proofread and correct wide-angle side are crooked.In addition, through using aspheric surface in the most approaching lens surface in second lens unit, can advantageously proofread and correct spherical aberration and the coma aberration of taking the photograph far-end as side.Therefore, can obtain the further improvement of optical property.
Second lens unit can be made up of three lens, and this is the minimum lens numbers in the angle of attenuate lens and aberration correction.This helps reducing size and cost.
Preferably, first lens unit by two or still less lens form.Through constituting first lens unit, can obtain the miniaturization on optical axis direction and the diametric(al) by a spot of like this lens.Preferably, first lens unit has negative lens element and positive element.
Negative lens element in first lens unit and positive element can be engaged with each other.Use the lens of this joint to help effectively chromatic aberation on the axis calibration, this axle is gone up chromatic aberation and is harmful to when the focal length of taking the photograph far-end increases along with the increase of zoom ratio.In addition, use the lens that engage to make it possible to reduce the centrifugal relatively optical performance degradation that causes of the lens element that causes owing to assembly error, therefore help to improve turnout and reduce cost.
Negative lens element in first lens unit can be the lens element of asynthetic each other independence (or separation) with positive element.This structure helps more effectively proofreading and correct the distortion and the coma aberration of wide-angle side and the coma aberration of taking the photograph far-end.
Preferably, select the refractive index of first lens unit by the mode of the expression formula that meets the following conditions:
0.2＜f 1/f t＜1.6…(1-7)
F wherein 1Be the focal length of first lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If do not surpass the upper limit of conditional expression (1-7), then first lens unit can have enough refractive indexes.This helps making that the whole length of zoom lens is short and make lens barrel less.If do not surpass the lower limit of conditional expression (1-7), then prevented the refractive index grow.This helps reducing taking the photograph the generation of the spherical aberration and the coma aberration of far-end, to obtain the good optical performance.
More preferably, the top conditional expression that provides (1-7) is revised as following conditional expression (1-7 ') and satisfies this amended conditional expression (1-7 '):
0.40＜f 1/f t＜0.95…(1-7’)。
In addition, more preferably, conditional expression (1-7) is revised as following conditional expression (1-7 ") and satisfies this further amended conditional expression (1-7 "):
0.62＜f 1/f t＜0.68…(1-7”)。
Only the upper limit of conditional expression (1-7) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-7 ') or (1-7 ").
Zoom lens according to first aspect present invention can be made up of following four lens units from thing side arranged in sequence: have positive refractive index first lens unit, have second lens unit of negative index, the 4th lens unit that has the 3rd lens unit of positive refractive index and have positive refractive index.In this case, preferably, in this Zoom lens optical system, aperture diaphragm is provided; And during from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; The 4th lens unit moves, and aperture diaphragm moves.
Zoom lens according to first embodiment of the invention can be made up of following five lens units from thing side arranged in sequence: have positive refractive index first lens unit, have negative index second lens unit, have the 3rd lens unit of positive refractive index, the 5th lens unit that has the 4th lens unit of negative index and have positive refractive index.In this case, preferably, in this Zoom lens optical system, aperture diaphragm is provided; And during from wide-angle side to the zoom of taking the photograph far-end, first lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end with it, and second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end with it; The 4th lens unit moves, and the 5th lens unit moves, and aperture diaphragm moves.
Through moving all lens units as described above, can for providing convergent-divergent, each lens unit change function effectively, therefore, even when field angle and zoom ratio increase, also can obtain excellent properties.Move aperture diaphragm and make the chromatic aberation that effectively to proofread and correct convergent-divergent and distortion so that the advantage on the performance to be provided, and can suitably control the position of entrance pupil and the position of emergent pupil.Therefore; Can obtain wide-angle side from the light height of Axial Bundle and take the photograph far-end from the well balanced between the light height of Axial Bundle, and the external diameter that can under the situation of well balanced, make the lens unit of winning is with the most less near the external diameter of the lens unit that looks like side.Specifically, the external diameter of first lens unit reduce advantageously cause lens to reduce in the size of the thickness direction direction of optical axis (that is, along).In addition; Because can be controlled in the variation of exit pupil position during the zoom or can make that it is less; So can the incident angle of light on CCD or cmos sensor etc. be remained in the proper range, and can prevent in the outer regions of picture region, to occur brightness decline (or concealment).This is favourable when zoom lens use with the electronic image pickup device.
Preferably, form by nine or still less lens element according to the zoom lens of first aspect present invention.The increase of number of lens elements will cause the cost of zoom lens and the increase of size.
Preferably, according to the zoom lens of the first aspect present invention expression formula that meets the following conditions:
4.0＜f t/f w＜20.0…(1-8)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end, f wBe the focal length of whole zoom-lens system in wide-angle side.
If surpass the upper limit of conditional expression (1-8), then be difficult to through adopting structure to obtain enough optical properties according to first aspect present invention.If surpass the lower limit of conditional expression (1-8), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost angle that joins with structurally associated according to first aspect present invention.
More preferably, the top conditional expression that provides (1-8) is revised as following conditional expression (1-8 ') and satisfies this amended conditional expression (1-8 '):
5.5＜f t/f w＜15.0…(1-8’)。
In addition, more preferably, conditional expression (1-8) is revised as following conditional expression (1-8 ") and satisfies this further amended conditional expression (1-8 "):
7.0＜f t/f w＜12.0…(1-8”)。
Only the upper limit of conditional expression (1-8) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-8 ') or (1-8 ").
Preferably, according to the zoom lens of the first aspect present invention expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00…(1-9)
I wherein MwBe the maximum image height degree of the wide-angle side of zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
If surpass the upper limit of conditional expression (1-9), then be difficult to through adopting structure to obtain enough optical properties according to first aspect present invention.If surpass the lower limit of conditional expression (1-9), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost angle that joins with structurally associated according to first aspect present invention.
More preferably, the top conditional expression that provides (1-9) is revised as following conditional expression (1-9 ') and satisfies this amended conditional expression (1-9 '):
0.60＜I mw/f w＜0.95…(1-9’)。
In addition, more preferably, conditional expression (1-9) is revised as following conditional expression (1-9 ") and satisfies this further amended conditional expression (1-9 "):
0.70＜I mw/f w＜0.80…(1-9”)。
Only the upper limit of conditional expression (1-9) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (1-9 ') or (1-9 ").
Be beneficial to the electronic image pickup apparatus that reduces size and acquisition high zoom ratios and wide visual field angle when keeping the excellent picture quality of institute's captured image no through using the picture that zoom lens are formed to convert the image pick-up element of electric signal into, can providing difficultly.
In addition, preferably, image pick-up device is provided with image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by zoom lens is the picture signal of wherein having proofreaied and correct distortion.Therefore, allow in the picture that zoom lens form, to leave distortion.This provides the quantity that reduces the lens element in the zoom lens and has made the littler further advantage of size of zoom lens.
In order to satisfy the user for needs than a broader category of shot region of the past; The present invention can provide a kind of zoom lens and device according to its first aspect; These zoom lens help obtaining higher zoom ratio and wideer field angle with device; And be suitable for using, and can have no to provide image with excellent picture quality with electronic image pickup device such as CCD or cmos sensor difficultly.
Zoom lens according to second aspect present invention comprise from its thing side in order: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index; Wherein carry out zoom through the distance that changes between these lens units; First lens unit is made up of a negative lens element and at least one positive element, and these zoom lens expression formula that meets the following conditions:
2.00＜nd 1n＜2.30…(2-1)
13.0＜vd 1n＜30.0…(2-2)
Nd wherein 1nBe negative lens element in first lens unit to the refractive index of d line, and vd 1nIt is the Abbe number of the negative lens element in first lens unit.
Below, with describing reason and the advantage thereof that adopts said structure why.
In the structure that second aspect present invention adopts; Zoom lens comprise from the thing side in order: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index, and carry out zoom through the distance that changes between these lens units.Through this structure, the convergent-divergent variation that between lens unit, disperseed (or sharing) effectively makes that thus the variation of aberration is less during zoom.In addition, prevented that the mobile quantitative change of each lens unit is big, this makes the optical system miniaturization.In addition, in first lens unit, has a negative lens element and a positive element makes it possible to carry out well aberration correction.
Comprise first lens unit in order from the thing side in the zoom lens structure, have second lens unit of negative index and have under the situation of the 3rd lens unit of positive refractive index with positive refractive index; If make that the size of zoom lens is less, then need first lens unit to have the strong refraction rate.In order to proofread and correct the aberration that is associated with positive refractive index, the refractive index that must make negative lens element greatly to a certain degree.Reason for this reason, negative lens element often has less paraxial radius-of-curvature.In having first lens unit of positive refractive index, usually negative lens element is designed to have higher relatively dispersity to satisfy the needs of correcting colour aberration.If the paraxial radius-of-curvature of negative lens element is less, the more aberration of high-order then possibly appear.Specifically, owing to the influence of high chromatic dispersion, the more high-order chromatic aberation of convergent-divergent often appears.The amount of the chromatic aberation that the amount of consequent chromatic aberation will produce above positive element causes the remarkable deterioration of the picture quality of institute's captured image.The amount of chromatic aberation increases when leaving optical axis, and its harmful effect is along with in the increase of the field angle of wide-angle side and increase.Therefore, be difficult to obtain the convergent-divergent chromatic aberation in wide-angle side with take the photograph the well balanced between the far-end.
Consider above situation, the glass material of suitably selecting the negative lens element in first lens unit is very important.Specifically, preferably, can select the glass material of negative lens element by expression formula that satisfies condition (2-1) and mode (2-2).
If do not surpass the upper limit of conditional expression (2-1), then can use some suitable glass material.If surpassed the upper limit of conditional expression (2-1), then almost can not use glass material, because for example be difficult to find the glass material that satisfies conditions needed.If do not surpass the lower limit of conditional expression (2-1), needn't make that then the paraxial radius-of-curvature of negative lens element is very little of to obtain enough negative indexes.This helps reducing aberration, for example convergent-divergent from axial chromatic aberration.In addition, negative lens element can have enough negative indexes, and this helps proofreading and correct by the for example spherical aberration of positive element generation and the various aberrations of coma aberration.
Design negative lens element by the mode of the upper limit that is no more than conditional expression (2-1) and help chromatic aberation on the axis calibration.If surpass the lower limit of conditional expression (2-2), then the partial dispersion of glass material can be not excessive than (or relative partial dispersion), and can make that the amount of the chromatic aberation that in relatively short wavelength coverage, produces is less.This helps the secondary spectrum of correcting colour aberration.For above-mentioned reasons, if the expression formula that satisfies condition (2-1) and (2-2) then can not have the compact optical system that realizes having wide visual field angle, high zoom ratios and favorable optical performance difficultly.
More preferably, the top conditional expression that provides (2-1) is revised as following conditional expression (2-1 ') and satisfies this amended conditional expression (2-1 '):
2.04＜nd 1n＜2.25…(2-1’)。
In addition, more preferably, conditional expression (2-1) is revised as following conditional expression (2-1 ") and satisfies this further amended conditional expression (2-1 "):
2.08＜nd 1n＜2.20…(2-1”)。
Only the upper limit of conditional expression (2-1) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-1 ') or (2-1 ").
More preferably, the top conditional expression that provides (2-2) is revised as following conditional expression (2-2 ') and satisfies this amended conditional expression (2-2 '):
14.0＜vd 1n＜25.0…(2-2’)。
In addition, more preferably, conditional expression (2-2) is revised as following conditional expression (2-2 ") and satisfies this further amended conditional expression (2-2 "):
15.0＜vd 1n＜20.0…(2-2”)。
Only the upper limit of conditional expression (2-2) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-2 ') or (2-2 ").
Preferably, the negative lens element in first lens unit has the concaveconvex shape of convex surface towards the thing side.Through this characteristic, feasible less from the incident angle of axial ray on its lens surface, can reduce the generation of aberration thus.In this case, the expression formula that preferably meets the following conditions:
1.0＜SF 1n＜15.0…(2-3)
SF wherein 1nBy SF 1n=(R 1nf+ R 1nr)/(R 1nf-R 1nr) definition, R 1nfBe the paraxial radius-of-curvature of the thing side surface of the negative lens element in second lens unit, and R 1nrIt is the paraxial radius-of-curvature of the picture side surface of the negative lens element in first lens unit.
If do not surpass the upper limit of conditional expression (2-3), needn't make that then the paraxial radius-of-curvature on two surfaces of lens is all very little of to obtain suitably negative multiplying power.This helps reducing the more chromatic aberation of high-order.If do not surpass the lower limit of conditional expression (2-3), then negative lens element has enough refractive indexes.This helps eliminating the aberration that is produced by the positive element in this lens unit.
More preferably, the top conditional expression that provides (2-3) is revised as following conditional expression (2-3 ') and satisfies this amended conditional expression (2-3 '):
4.0＜SF 1n＜12.0…(2-3’)。
In addition, more preferably, conditional expression (2-3) is revised as following conditional expression (2-3 ") and satisfies this further amended conditional expression (2-3 "):
7.5＜SF 1n＜9.3…(2-3”)。
Only the upper limit of conditional expression (2-3) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-3 ') or (2-3 ").
Preferably, make the thickness of the lens unit of winning as much as possible little in proper range.This makes it possible to reduce under the folding state of lens barrel zoom lens in the size of thickness direction.In addition, this also makes it possible to reduce to be incident on the light height on the zoom lens, and this causes reducing in diametric size.Specifically, the expression formula that preferably meets the following conditions:
0.40＜∑d 1G/I mw＜3.00…(2-4)
∑ d wherein 1GBe the thickness of first lens unit on optical axis, I MwIt is the maximum image height degree of the wide-angle side of zoom lens.
Mode by not surpassing the upper limit of conditional expression (2-4) designs thickness and the diameter thereof that zoom lens help reducing lens frame (or lens barrel) under the state that lens barrel folds.If do not surpass the upper limit of conditional expression (2-4), then can easily each lens element that constitutes first lens unit be designed to have enough refractive indexes.In addition, can prevent each lens element on optical axis thickness and in the less thick of its edge.This helps easily processing (or manufacturing) lens element.
More preferably, the top conditional expression that provides (2-4) is revised as following conditional expression (2-4 ') and satisfies this amended conditional expression (2-4 '):
0.70＜∑d 1G/I mw＜2.10…(2-4’)。
In addition, more preferably, conditional expression (2-4) is revised as following conditional expression (2-4 ") and satisfies this further amended conditional expression (2-4 "):
1.05＜∑d 1G/I mw＜1.25…(2-4”)。
Only the upper limit of conditional expression (2-4) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-4 ') or (2-4 ").
First lens unit can be by comprising that a negative lens element and a positive element two or lens element still less form.Constitute first lens unit through lens, can make at optical axis direction and diametric size less with such smallest number.In this case, preferably first lens unit is constituted and comprise negative lens element and positive element.Therefore, negative lens element can be proofreaied and correct the aberration that is produced by positive element satisfactorily.
Negative lens element in first lens unit and positive element can be bonded with each other.Use the lens of this joint to make it possible to effectively chromatic aberation on the axis calibration, this axle is gone up chromatic aberation and is harmful to when the focal length of taking the photograph far-end increases along with the increase of zoom ratio.In addition, use the lens that engage to make it possible to reduce the centrifugal relatively optical performance degradation that causes of the lens element that causes owing to assembly error, therefore help to improve turnout and reduce cost.
Negative lens element in first lens unit can be mutual asynthetic independence (or separation) lens subassembly with positive element.This structure makes it possible to more effectively proofread and correct the distortion and the coma aberration of wide-angle side and the coma aberration of taking the photograph far-end.
Under the situation that first lens unit is made up of two lens elements therein; In order when first lens unit being designed to have stronger relatively positive refractive index, to reduce monochromatic aberration and chromatic aberation to obtain good aberration performance; Preferably; Make that the refractive index of negative lens element and positive element is big as far as possible, and make that the Abbe number of these lens elements is big as far as possible.On the other hand, the Abbe number of glass material is big more, and its refractive index is often more little.
Consider this situation, preferably, meet the following conditions expression formula (2-5) and (2-6) of the glass material of negative lens element and positive element:
0.20＜nd 1n-nd 1p＜0.55…(2-5)
20.0＜vd 1p-vd 1n＜55.0…(2-6)
Nd wherein 1nBe that negative lens element in first lens unit is to the refractive index of d line, vd 1pBe the Abbe number of the positive element in first lens unit, nd 1pBe positive element in first lens unit to the refractive index of d line, and vd 1nIt is the Abbe number of the negative lens element in first lens unit.
If surpass the upper limit of conditional expression (2-5), then the refractive index of the positive element in first lens unit become higher in, its Abbe number correspondingly becomes less.In this case, positive element and negative lens element are not having enough difference each other on the Abbe number, and obtain the correction of chromatic aberation unsatisfactorily.If surpass the lower limit of conditional expression (2-5), the refractive index step-down of positive element then, and therefore need make that the radius-of-curvature of lens surface is less.In this case, produce a large amount of coma aberrations, especially taking the photograph far-end.
If surpass the upper limit of conditional expression (2-6), then the Abbe number of the positive element in first lens unit become bigger in, it is lower that its refractive index correspondingly becomes.Therefore, need make that the radius-of-curvature of lens surface is less.In this case, produce a large amount of coma aberrations, especially taking the photograph far-end.If surpass the lower limit of conditional expression (2-6), then the chromatic aberation in first lens unit becomes not enough.
More preferably, the top conditional expression that provides (2-5) is revised as following conditional expression (2-5 ') and satisfies this amended conditional expression (2-5 '):
0.25＜nd 1n-nd 1p＜0.50…(2-5’)。
In addition, more preferably, conditional expression (2-5) is revised as following conditional expression (2-5 ") and satisfies this further amended conditional expression (2-5 "):
0.30＜nd 1n-nd 1p＜0.45…(2-5”)。
Only the upper limit of conditional expression (2-5) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-5 ') or (2-5 ").
More preferably, the top conditional expression that provides (2-6) is revised as following conditional expression (2-6 ') and satisfies this amended conditional expression (2-6 '):
25.0＜vd 1p-vd 1n＜47.0…(2-6’)。
In addition, more preferably, conditional expression (2-6) is revised as following conditional expression (2-6 ") and satisfies this further amended conditional expression (2-6 "):
31.0＜vd 1p-vd 1n＜38.0…(2-6”)。
Only the upper limit of conditional expression (2-6) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-6 ') or (2-6 ").
Preferably, select the refractive index of first lens unit by the mode of the expression formula that meets the following conditions:
0.2＜f 1/f t＜1.0…(2-7)
F wherein 1Be the focal length of first lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If surpass the upper limit of conditional expression (2-7), a little less than the refractive index that has then prevented first lens unit became, this helped making that the whole length of whole zoom-lens system is short and make that the size of lens barrel is less.If surpass the lower limit of conditional expression (2-7), prevented that then the refractive index of first lens unit from becoming strong, this helps proofreading and correct spherical aberration and coma aberration and the acquisition good optical performance of taking the photograph far-end.
More preferably, the top conditional expression that provides (2-7) is revised as following conditional expression (2-7 ') and satisfies this amended conditional expression (2-7 '):
0.40＜f 1/f t＜0.75…(2-7’)。
In addition, more preferably, conditional expression (2-7) is revised as following conditional expression (2-7 ") and satisfies this further amended conditional expression (2-7 "):
0.62＜f 1/f t＜0.68…(2-7”)。
Only the upper limit of conditional expression (2-7) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-7 ') or (2-7 ").
Preferably, select the focal length of second lens unit by the mode of the expression formula that meets the following conditions:
0.02＜|f 2/f t|＜0.50…(2-8)
F wherein 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
Conditional expression (2-8) relate to that size reduces and the aberration performance between balance.If surpass the upper limit of conditional expression (2-8), a little less than the refractive index that has then prevented second lens unit became, this helped reducing the size of whole lens combination.If surpass the lower limit of conditional expression (2-8), prevented that then the refractive index of second lens unit from becoming strong, this helps reducing in the off-axis aberration of wide-angle side and is taking the photograph the spherical aberration of far-end.
More preferably, the top conditional expression that provides (2-8) is revised as following conditional expression (2-8 ') and satisfies this amended conditional expression (2-8 '):
0.08＜|f 2/f t|＜0.36…(2-8’)。
In addition, more preferably, conditional expression (2-8) is revised as following conditional expression (2-8 ") and satisfies this further amended conditional expression (2-8 "):
0.12＜|f 2/f t|＜0.16…(2-8”)。
Only the upper limit of conditional expression (2-8) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-8 ') or (2-8 ").
Zoom lens according to second aspect present invention can be made up of following four lens units from thing side arranged in sequence: have positive refractive index first lens unit, have second lens unit of negative index, the 4th lens unit that has the 3rd lens unit of positive refractive index and have positive refractive index.In this case, preferably, aperture diaphragm is provided in Zoom lens optical system; And during from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; The 4th lens unit moves, and aperture diaphragm moves.During moving, first lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.Second lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.The 3rd lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the protruding track of thing side.The 4th lens unit can more move near the mode of thing side than in wide-angle side taking the photograph far-end by it, and perhaps it can be by taking the photograph far-end than more moving near the mode as side in wide-angle side.The 4th lens unit can dull move, and perhaps it can be along moving towards the thing side or as the track of side protrusion.
Zoom lens according to second aspect present invention can be made up of following five lens units from thing side arranged in sequence: have positive refractive index first lens unit, have second lens unit of negative index, the 3rd lens unit, the 5th lens unit that has the 4th lens unit of negative index and have positive refractive index with positive refractive index.In this case, preferably, aperture diaphragm is provided in Zoom lens optical system; And during from wide-angle side to the zoom of taking the photograph far-end, first lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; The 4th lens unit moves, and the 5th lens unit moves, and aperture diaphragm moves.During moving, first lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.Second lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.The 3rd lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the protruding track of thing side.The 4th lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.The 5th lens unit can more move near the mode of thing side than in wide-angle side taking the photograph far-end by it, and perhaps it can be by taking the photograph far-end than more moving near the mode as side in wide-angle side.The 5th lens unit can dull move, and perhaps it can be along moving towards the thing side or as the track of side protrusion.
Preferably, aperture diaphragm is arranged between second lens unit and the 3rd lens unit, and aperture diaphragm and the 3rd lens unit move integratedly during zoom.Through this characteristic, can make the entrance pupil position more near the thing side, and can make the exit pupil position further from the picture plane.Because aperture diaphragm is arranged in from the lower position of the height of axial ray,, and can make that the dead zone (dead space) of moving aperture diaphragm is very little so that the size of aperture diaphragm does not need is very big.Can replace aperture diaphragm by shutter unit.
Through moving all lens units as described above, can for providing convergent-divergent, each lens unit change function effectively, therefore, even when field angle and zoom ratio increase, also can obtain excellent properties.Move aperture diaphragm and make the chromatic aberation that effectively to proofread and correct convergent-divergent and distortion so that the advantage on the performance to be provided, and can suitably control the position of entrance pupil and the position of emergent pupil.This means can obtain wide-angle side from the light height of Axial Bundle and take the photograph far-end from the well balanced between the light height of Axial Bundle, and the external diameter that can under the situation of well balanced, make the lens unit of winning is with the most less near the external diameter of the lens unit that looks like side.Specifically, in wide-angle side, the reducing of the external diameter of first lens unit advantageously causes lens to reduce in the size of the thickness direction direction of optical axis (that is, along).In addition; Because can be controlled in the variation of exit pupil position during the zoom (be convergent-divergent change) or can make that it is less; So can the incident angle of light on CCD or cmos sensor etc. be remained in the proper range, thereby can prevent in the outer regions of picture region, to occur brightness decline (or concealment).Therefore, these zoom lens are suitable for using with the electronic image pickup device.
Preferably, form by nine or still less lens element according to the zoom lens of second aspect present invention.The increase of number of lens elements will cause the cost of zoom lens and the increase of size.
Preferably, according to the zoom lens of the second aspect present invention expression formula that meets the following conditions:
4.0＜f t/f w＜20.0…(2-9)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and f wBe the focal length of whole zoom-lens system in wide-angle side.
If surpass the upper limit of conditional expression (2-9), then be difficult to through adopting structure to obtain enough optical properties according to second aspect present invention.If surpass the lower limit of conditional expression (2-9), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost angle that joins with structurally associated according to second aspect present invention.
More preferably, the top conditional expression that provides (2-9) is revised as following conditional expression (2-9 ') and satisfies this amended conditional expression (2-9 '):
6.5＜f t/f w＜15.0…(2-9’)。
In addition, more preferably, conditional expression (2-9) is revised as following conditional expression (2-9 ") and satisfies this further amended conditional expression (2-9 "):
9.5＜f t/f w＜12.0…(2-9”)。
Only the upper limit of conditional expression (2-9) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-9 ') or (2-9 ").
Preferably, according to the zoom lens of the second aspect present invention expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00…(2-10)
I wherein MwBe the maximum image height degree of the wide-angle side of zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
If surpass the upper limit of conditional expression (2-10), then be difficult to through adopting structure to obtain enough optical properties according to second aspect present invention.If surpass the lower limit of conditional expression (2-10), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost angle that joins with structurally associated according to second aspect present invention.
More preferably, the top conditional expression that provides (2-10) is revised as following conditional expression (2-10 ') and satisfies this amended conditional expression (2-10 '):
0.60＜I mw/f w＜0.95…(2-10’)。
In addition, more preferably, conditional expression (2-10) is revised as following conditional expression (2-10 ") and satisfies this further amended conditional expression (2-10 "):
0.70＜I mw/f w＜0.80…(2-10”)。
Only the upper limit of conditional expression (2-10) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-10 ') or (2-10 ").
Preferably, confirm the whole length of zoom lens by the mode of the expression formula that meets the following conditions:
5.0＜L t/I mw＜17.5…(2-11)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of zoom lens.
If surpass the upper limit of conditional expression (2-11), can make that then the whole length of zoom-lens system is shorter, this helps reducing the size of the lens frame under the state that lens barrel folds.If surpass the lower limit of conditional expression (2-11), prevented that then the refractive index of each lens unit from becoming strong, this helps reducing the amount of the aberration that their produce.
More preferably, the top conditional expression that provides (2-11) is revised as following conditional expression (2-11 ') and satisfies this amended conditional expression (2-11 '):
8.0＜L t/I mw＜16.8…(2-11’)。
In addition, more preferably, conditional expression (2-11) is revised as following conditional expression (2-11 ") and satisfies this further amended conditional expression (2-11 "):
14.0＜L t/I mw＜16.0…(2-11”)。
Only the upper limit of conditional expression (2-11) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (2-11 ') or (2-11 ").
Be beneficial to the electronic image pickup apparatus that reduces size and acquisition high zoom ratios and wide visual field angle when keeping the excellent picture quality of institute's captured image no through using the picture that zoom lens are formed to convert the image pick-up element of electric signal into, can providing difficultly.
In addition, preferably, image pick-up device is provided with image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by zoom lens is the picture signal of wherein having proofreaied and correct distortion.Therefore, allow in the picture that zoom lens form, to leave distortion.This provides the quantity that reduces the lens element in the zoom lens and has made the littler further advantage of size of zoom lens.
Further preferably, image pick-up device is provided with image transitions portion, and it is the picture signal of wherein having proofreaied and correct the color imbalance that is caused by the convergent-divergent chromatic aberation that this image transitions portion will represent the electrical signal conversion of the picture of zoom lens formation through Flame Image Process.The chromatic aberation of the convergent-divergent through proofreading and correct zoom lens electronically can obtain excellent image.
As will know understanding according to top description; According to a second aspect of the invention; A kind of zoom lens and device can be provided; These zoom lens and device help realizing the reducing of video camera size, higher zoom ratio and wideer field angle, and are suitable for using with the electronic image pickup device such as CCD or cmos sensor, and can have no to provide the image with excellent picture quality difficultly.Thus, these zoom lens have satisfied the user for the needs than a broader category of shot region of the past with device, and can not damage portability.
Zoom lens according to third aspect present invention comprise from its thing side in order: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index; Wherein carry out zoom, and second lens unit comprises at least one positive element of the expression formula that meets the following conditions through the distance that changes between these lens units:
-0.50＜f 2/f t＜-0.03…(3-1)
2.00＜nd 2p＜2.30…(3-2)
13.0＜vd 2p＜30.0…(3-3)
F wherein 2Be the focal length of second lens unit, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end, nd 2pBe positive element in second lens unit to the refractive index of d line, and vd 2pIt is the Abbe number of the positive element in second lens unit.
In the structure that adopts by third aspect present invention; Zoom lens comprise by the order from the thing side: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index, and carry out zoom through the distance that changes between these lens units.Through this structure, the convergent-divergent variation that between lens unit, disperseed (or sharing) effectively makes that thus the variation of aberration is less during zoom.In addition, prevented that the mobile quantitative change of each lens unit is big, this makes the optical system miniaturization.
If when making the zoom lens size less, make the field angle broad, then often need first lens unit and second lens unit to have the strong refraction rate.Because second lens unit especially provides the lens unit of the main amount that convergent-divergent changes, so the aberration that must reduce by second lens unit as much as possible is to obtain the good optical performance in whole zooming range.In order to realize this point, preferably, select the refractive index of second lens unit by the mode of the expression formula that satisfies condition (3-1).This conditional expression relate to that size reduces and the aberration performance between balance (or compromise).If do not surpass the upper limit of conditional expression (3-1), prevented that then the refractive index of second lens unit from becoming strong, this helps reducing the off-axis aberration that produces in wide-angle side and taking the photograph the spherical aberration that far-end produces.If surpass the lower limit of conditional expression (3-1), a little less than the refractive index that has then prevented second lens unit became, this helped preventing that the size of whole lens combination from becoming big and obtaining enough field angle.
More preferably, the top conditional expression that provides (3-1) is revised as following conditional expression (3-1 ') and satisfies this amended conditional expression (3-1 '):
-0.30＜f 2/f t＜-0.07…(3-1’)。
In addition, more preferably, conditional expression (3-1) is revised as following conditional expression (3-1 ") and satisfies this further amended conditional expression (3-1 "):
-0.16＜f 2/f t＜-0.12…(3-1”)。
Only the upper limit of conditional expression (3-1) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-1 ') or (3-1 ").
Conditional expression (3-2) and (3-3) relate to the glass material of the positive element in second lens unit.
As stated, second lens unit has stronger negative index relatively.Therefore, produce a large amount of aberrations by negative lens element probably.In order to eliminate aberration that negative lens element produces, preferably, positive element is provided in second lens unit and suitably selects the glass material of this positive element to obtain effective aberration correction.Specifically, the expression formula (3-2) that preferably satisfies condition.
If do not surpass the upper limit of conditional expression (3-2), then guaranteed to use glass material, prevent the cost increase, and helped its a large amount of productions.If do not surpass the lower limit of conditional expression (3-2), then do not need lens element thicker so that required multiplying power to be provided, prevented to increase the size of lens combination thus.In addition, can make that off-axis aberration (for example the coma aberration of wide-angle side and visual field the are crooked and spherical aberration of taking the photograph far-end) is less, and can obtain the good optical performance.
Conditional expression (3-3) relates to the correction of chromatic aberation.If do not surpass the upper limit of conditional expression (3-3), then can proofread and correct chromatic aberation effectively for C line and F line.If surpass the lower limit of conditional expression (3-3), can make that then the partial dispersion ratio in the relatively short wavelength coverage is very little, can reduce remaining secondary spectrum thus.
More preferably, the top conditional expression that provides (3-2) is revised as following conditional expression (3-2 ') and satisfies this amended conditional expression (3-2 '):
2.05＜nd 2p＜2.25…(3-2’)。
In addition, more preferably, conditional expression (3-2) is revised as following conditional expression (3-2 ") and satisfies this further amended conditional expression (3-2 "):
2.08＜nd 2p＜2.15…(3-2”)。
Only the upper limit of conditional expression (3-2) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-2 ') or (3-2 ").
More preferably, the top conditional expression that provides (3-3) is revised as following conditional expression (3-3 ') and satisfies this amended conditional expression (3-3 '):
14.0＜vd 2p＜25.0…(3-3’)。
In addition, more preferably, conditional expression (3-3) is revised as following conditional expression (3-3 ") and satisfies this further amended conditional expression (3-3 "):
15.0＜vd 2p＜20.0…(3-3”)。
Only the upper limit of conditional expression (3-3) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-3 ') or (3-3 ").
In addition, in above-mentioned zoom lens, preferably adopt any one in the following characteristic according to third aspect present invention.
Preferably, second lens unit is by comprising that two negative lens elements and a positive element three or lens element still less form.Be distributed to two negative lens elements through negative multiplying power, prevented that each the radius-of-curvature in these lens elements is too small, can prevent to produce a large amount of aberrations thus second lens unit.Little to three or help reducing the size of zoom-lens system less than the quantity of three lens element.
Second lens unit can be made up of first negative lens element, positive element and second negative lens element by the order from the thing side.Arrange through this, improved the symmetry of lens arrangement, in second lens unit, can realize effective aberration correction thus.
In this case, for the aberration that further reduces to produce in second lens unit, preferably, design the shape of the positive element in second lens unit by the mode of the expression formula that meets the following conditions:
0.2＜SF 2p1＜3.50…(3-4)
SF wherein 2p1By SF 2p1=(R 2pf1+ R 2pr1)/(R 2pf1-R 2pr1) definition, R 2pf1Be the paraxial radius-of-curvature of the thing side surface of the positive element of between first negative lens element and second negative lens element, arranging in second lens unit, and R 2pr1It is the paraxial radius-of-curvature of the picture side surface of the positive element of between first negative lens element and second negative lens element, arranging in second lens unit.
If do not surpass the upper limit of conditional expression (3-4), then the positive lens surface has enough refractive indexes, and this helps proofreading and correct spherical aberration and the coma aberration that negative lens element produces.If surpass the lower limit of conditional expression (3-4), prevented that then the curvature on two surfaces of positive element from uprising, prevented that thus the spherical aberration of positive element generation and the amount of coma aberration from becoming big on the contrary.Design positive element by the mode that does not surpass the upper and lower bound of conditional expression (3-4) and help improving optical property.
More preferably, the top conditional expression that provides (3-4) is revised as following conditional expression (3-4 ') and satisfies this amended conditional expression (3-4 '):
0.50＜SF 2p1＜2.50…(3-4’)。
In addition, more preferably, conditional expression (3-4) is revised as following conditional expression (3-4 ") and satisfies this further amended conditional expression (3-4 "):
0.80＜SF 2p1＜1.40…(3-4”)。
Only the upper limit of conditional expression (3-4) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-4 ') or (3-4 ").
Second lens unit can be made up of first negative lens element, second negative lens element and positive element by the order from the thing side.This structure helps when keeping suitable refractive index, increasing zoom ratio and attenuate second lens unit along the thickness of optical axis direction, is provided for carrying out enough spaces that convergent-divergent changes thus.
In this case, for the aberration amount that further reduces in second lens unit, to produce, preferably, design the shape of second lens unit by the mode of the expression formula that meets the following conditions:
-4.5＜SF 2p2＜-0.5…(3-5)
SF wherein 2p2By SF 2p2=(R 2pf2+ R 2pr2)/(R 2pf2-R 2pr2) definition, R 2pf2Be in second lens unit near the paraxial radius-of-curvature of the thing side surface of the positive element of picture side, and R 2pr2It is the paraxial radius-of-curvature as side surface of the positive element of the most approaching picture side in second lens unit.
If do not surpass the upper limit of conditional expression (3-5), prevented that then the curvature on two surfaces of positive element from uprising, prevented that thus the quantitative change of spherical aberration and coma aberration is big.If do not surpass the lower limit of conditional expression (3-5), then the positive lens surface has enough refractive indexes, and this helps proofreading and correct spherical aberration and the coma aberration that negative lens element produces.Design positive element by the mode that does not surpass the upper and lower bound of conditional expression (3-5) and help improving optical property.
More preferably, the top conditional expression that provides (3-5) is revised as following conditional expression (3-5 ') and satisfies this amended conditional expression (3-5 '):
-3.0＜SF 2p2＜-0.7…(3-5’)。
In addition, more preferably, conditional expression (3-5) is revised as following conditional expression (3-5 ") and satisfies this further amended conditional expression (3-5 "):
-1.7＜SF 2p2＜-0.9…(3-5”)。
Only the upper limit of conditional expression (3-5) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-5 ') or (3-5 ").
Zoom lens according to third aspect present invention can be made up of following four lens units from thing side arranged in sequence: the first positive lens unit, the second negative lens unit, positive the 3rd lens unit and the 4th positive lens unit.In this case, preferably, aperture diaphragm is provided in Zoom lens optical system; And during from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; The 4th lens unit moves, and aperture diaphragm moves.During moving, first lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.Second lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.The 3rd lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the protruding track of thing side.The 4th lens unit can more move near the mode of thing side than in wide-angle side taking the photograph far-end by it, and perhaps it can be by taking the photograph far-end than more moving near the mode as side in wide-angle side.The 4th lens unit can dull move, and perhaps it can be along moving towards the thing side or as the track of side protrusion.
Zoom lens according to third aspect present invention can be made up of following five lens units from thing side arranged in sequence: the first positive lens unit, the second negative lens unit, positive the 3rd lens unit, negative the 4th lens unit and the 5th positive lens unit.In this case, preferably, aperture diaphragm is provided in Zoom lens optical system; And during from wide-angle side to the zoom of taking the photograph far-end, first lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; The 4th lens unit moves, and the 5th lens unit moves, and aperture diaphragm moves.During moving, first lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.Second lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.The 3rd lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the protruding track of thing side.The 4th lens unit can be only towards the thing side shifting, and perhaps it can be along moving towards the thing side or as the track of side protrusion.The 5th lens unit can more move near the mode of thing side than in wide-angle side taking the photograph far-end by it, and perhaps it can be by taking the photograph far-end than more moving near the mode as side in wide-angle side.The 5th lens unit can dull move, and perhaps it can be along moving towards the thing side or as the track of side protrusion.
Preferably, between second lens unit and the 3rd lens unit, arrange aperture diaphragm, and aperture diaphragm and the 3rd lens unit move integratedly during zoom.Through this characteristic, can make the entrance pupil position more near the thing side, and can make the exit pupil position further from the picture plane.Because aperture diaphragm is arranged in from the lower position of the height of axial ray, thus do not need the size of aperture diaphragm very big, and can make that the dead zone of moving aperture diaphragm is less.Can replace aperture diaphragm by shutter unit.
Through moving all lens units as described above, can provide convergent-divergent to change function to each lens unit effectively, even and therefore when field angle and zoom ratio increase, also can obtain excellent properties.Moving the aperture stop so that not only can effectively correct chromatic aberration and distortion scaled to provide advantages in performance, and can properly control the position and into the pupil position of the exit pupil.
This means can obtain wide-angle side from the light height of Axial Bundle and take the photograph far-end from the well balanced between the light height of Axial Bundle, and the external diameter that can under the situation of well balanced, make the lens unit of winning is with the most less near the external diameter of the lens unit that looks like side.Particularly at the wide-angle side place, the reducing of the external diameter of first lens unit advantageously causes lens to reduce in the size of the thickness direction direction of optical axis (that is, along).In addition; Because can be controlled in zoom (promptly; The convergent-divergent change) variation of exit pupil position perhaps can make that it is less during; So can the incident angle of light on CCD or cmos sensor etc. be remained in the proper range, can prevent easily that thus the brightness in the outer regions of picture region from descending (or covering).Therefore, these zoom lens are suitable for using with the electronic image pickup device.
Preferably, according to the zoom lens of the third aspect present invention expression formula that meets the following conditions:
4.0＜f t/f w＜20.0…(3-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If do not surpass the upper limit of conditional expression (3-6), then through adopting structure can easily obtain enough optical properties according to third aspect present invention.If surpass the lower limit of conditional expression (3-6), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost angle that joins with this structurally associated according to third aspect present invention.
More preferably, the top conditional expression that provides (3-6) is revised as following conditional expression (3-6 ') and satisfies this amended conditional expression (3-6 '):
5.5＜f t/f w＜15.0…(3-6’)。
In addition, more preferably, conditional expression (3-6) is revised as following conditional expression (3-6 ") and satisfies this further amended conditional expression (3-6 "):
7.0＜f t/f w＜12.0…(3-6”)。
Only the upper limit of conditional expression (3-6) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-6 ') or (3-6 ").
Preferably, according to the zoom lens of the third aspect present invention expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00…(3-7)
I wherein MwBe the maximum image height degree of the wide-angle side of zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
If do not surpass the upper limit of conditional expression (3-7), then through adopting structure can easily obtain enough optical properties according to third aspect present invention.If surpass the lower limit of conditional expression (3-7), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost angle that joins with this structurally associated according to third aspect present invention.
More preferably, the top conditional expression that provides (3-7) is revised as following conditional expression (3-7 ') and satisfies this amended conditional expression (3-7 '):
0.60＜I mw/f w＜0.95…(3-7’)。
In addition, more preferably, conditional expression (3-7) is revised as following conditional expression (3-7 ") and satisfies this further amended conditional expression (3-7 "):
0.70＜I mw/f w＜0.80…(3-7”)。
Only the upper limit of conditional expression (3-7) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-7 ') or (3-7 ").
Preferably, first lens unit is made up of two or still less lens element.Constitute first lens unit through lens element, can obtain the miniaturization on optical axis direction and the diametric(al) by such small number.
Preferably, first lens unit has negative lens element and positive element.
Negative lens element in first lens unit and positive element can be bonded with each other.Use the lens that engage like this to make it possible to effectively chromatic aberation on the axis calibration, chromatic aberation is harmful on this axle when the focal length of taking the photograph far-end increases along with the increase of zoom ratio.In addition, use the lens that engage to make it possible to reduce the centrifugal relatively optical performance degradation that causes of the lens element that causes owing to assembly error, therefore help to improve turnout and reduce cost.
Negative lens element in first lens unit can be mutual asynthetic independence (or separation) lens element with positive element.This structure makes it possible to more effectively proofread and correct the distortion and the coma aberration of wide-angle side and the coma aberration of taking the photograph far-end.
In order to reach the balance between miniaturization and the optical property, preferably, select the refractive index of first lens unit by the mode of the expression formula that meets the following conditions:
0.40＜f 1/f t＜1.30…(3-8)
F wherein 1Be the focal length of first lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If surpass the upper limit of conditional expression (3-8), the refractive index that has then prevented first lens unit excessively a little less than, and prevented that the whole length of whole zoom-lens system from becoming big.This helps reducing the size of lens barrel.
If do not surpass the lower limit that condition is expressed (3-8), then prevented the refractive index grow of first lens unit, and can reduce in the spherical aberration of taking the photograph far-end and coma aberration.This helps obtaining the good optical performance.
More preferably, the top conditional expression that provides (3-8) is revised as following conditional expression (3-8 ') and satisfies this amended conditional expression (3-8 '):
0.50＜f 1/f t＜1.00…(3-8’)。
In addition, more preferably, conditional expression (3-8) is revised as following conditional expression (3-8 ") and satisfies this further amended conditional expression (3-8 "):
0.60＜f 1/f t＜0.70…(3-8”)。
Only the upper limit of conditional expression (3-8) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-8 ') or (3-8 ").
Can select the refractive index of the 3rd lens unit by the mode of the expression formula that meets the following conditions:
0.10＜f 3/f t＜0.75…(3-9)
F wherein 3Be the focal length of the 3rd lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If surpass the upper limit of conditional expression (3-9), prevented that then the refractive index of the 3rd lens unit from dying down, and can make that the amount of movement that is used for the convergent-divergent variation is less.If surpass the lower limit of conditional expression (3-9), prevented that then paraxial picture convergent-divergent is too small, it is excessive to have prevented to be used for the amount of movement that convergent-divergent changes thus.This helps aberration correction.
More preferably, the top conditional expression that provides (3-9) is revised as following conditional expression (3-9 ') and satisfies this amended conditional expression (3-9 '):
0.15＜f 3/f t＜0.50…(3-9’)。
In addition, more preferably, conditional expression (3-9) is revised as following conditional expression (3-9 ") and satisfies this further amended conditional expression (3-9 "):
0.20＜f 3/f t＜0.25…(3-9”)。
Only the upper limit of conditional expression (3-9) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-9 ') or (3-9 ").
Preferably, in zoom lens, the lens unit GR that will have positive refractive index is arranged as the most approaching picture side.Through this characteristic, can suitably control the exit pupil position, thus can be so that light incides on the electronic image pickup device such as CCD or cmos sensor effectively.
Preferably, select the refractive index of this lens unit GR by the mode of the expression formula that meets the following conditions:
0.10＜f R/f t＜0.50…(3-10)
F wherein RBe the focal length of the lens unit of the most approaching picture side in the whole zoom-lens system, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If do not surpass the upper limit of conditional expression (3-10), prevented that then the refractive index of lens unit GR from dying down, this helps correcting astigmatism and distortion in whole zooming range.If do not surpass the lower limit of conditional expression (3-10), then prevented the refractive index grow of lens unit GR, on whole zoom position, prevented to occur overcorrect thus to astigmatism and distortion.
More preferably, the top conditional expression that provides (3-10) is revised as following conditional expression (3-10 ') and satisfies this amended conditional expression (3-10 '):
0.15＜f R/f t＜0.40…(3-10’)。
In addition, more preferably, conditional expression (3-10) is revised as following conditional expression (3-10 ") and satisfies this further amended conditional expression (3-10 "):
0.20＜f R/f t＜0.30…(3-10”)。
Only the upper limit of conditional expression (3-10) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (3-10 ') or (3-10 ").
In the above-mentioned pattern according to third aspect present invention, more preferably, adopting simultaneously can optional some condition and characteristic.In modification (or further restriction), can only make amendment to higher limit or lower limit for the numerical range of each conditional expression.In addition, can be by any possible combined with above-mentioned various characteristics.
Be beneficial to the electronic image pickup apparatus that reduces size and acquisition high zoom ratios and wide visual field angle when keeping the excellent picture quality of institute's captured image no through using the picture that zoom lens are formed to convert the image pick-up element of electric signal into, can providing difficultly.
In addition, preferably, image pick-up device is provided with image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by zoom lens is the picture signal of wherein having proofreaied and correct distortion.Therefore, allow in the picture that zoom lens form, to leave distortion.This provides the quantity that reduces the lens element in the zoom lens and has made the littler further advantage of size of zoom lens.
In order to satisfy the user for than the in the past needs of the shot region of kind and do not damage portability widely; The present invention can provide a kind of zoom lens and device according to its third aspect; These zoom lens and device help obtaining the reducing of video camera size, higher zoom ratio and wideer field angle; And be suitable for using, and can not have the image with excellent picture quality is provided difficultly with electronic image pickup device such as CCD or cmos sensor.
Zoom lens according to fourth aspect present invention comprise from its thing side in order: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index; Wherein carry out zoom through the distance that changes between these lens units; First lens unit has a negative lens element and a positive element, and the zoom lens expression formula that meets the following conditions:
0.1＜f 1/f t＜1.05…(4-1)
1.70＜nd 1p＜2.20…(4-2)
F wherein 1Be the focal length of first lens unit, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and nd 1pBe that positive element in first lens unit is to the refractive index of d line.
Below, with describing reason and the advantage thereof that adopts said structure why.
In the structure that fourth aspect present invention adopts; Zoom lens comprise by the order from the thing side: have first lens unit of positive refractive index, the 3rd lens unit that has second lens unit of negative index and have positive refractive index, and carry out zoom through the distance that changes between these lens units.Through this structure, the convergent-divergent variation that between lens unit, disperseed (or sharing) effectively makes that thus the variation of aberration is less during zoom.In addition, prevented that the mobile quantitative change of each lens unit is big, this makes the optical system miniaturization.In addition, in first lens unit, has a negative lens element and a positive element makes it possible to carry out well aberration correction.
First lens unit is by two lens elements, and promptly a negative lens and a positive lens are formed.Constitute first lens unit through lens element, can make along the thickness of optical axis direction lessly, and can make that lens frame is less under the folding state of lens barrel by such smallest number.Because make the entrance pupil position more near the thing side in this case, so can make the light height on the lens surface of winning lower, this helps reducing in diametric size.
Comprise first lens unit by order in the zoom lens structure, have second lens unit of negative index and have under the situation of the 3rd lens unit of positive refractive index with positive refractive index from the thing side; If make that the size of zoom lens is less, then need first lens unit to have the strong refraction rate.For reach that size reduces and the aberration performance between balance, preferably, the focal length of first lens unit expression formula that meets the following conditions:
0.1＜f 1/f t＜1.05…(4-1)
F wherein 1Be the focal length of first lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If surpass the upper limit of conditional expression (4-1), the refractive index that has then prevented first lens unit excessively a little less than, this helps making the size that the whole length of whole zoom-lens system is short and reduce lens barrel.If surpass the lower limit of conditional expression (4-1), prevented that then the refractive index of first lens unit is strong excessively, this helps reducing taking the photograph spherical aberration and coma aberration and the acquisition good optical performance that far-end produces.
More preferably, the top conditional expression that provides (4-1) is revised as following conditional expression (4-1 ') and satisfies this amended conditional expression (4-1 '):
0.3＜f 1/f t＜0.8…(4-1’)。
In addition, more preferably, conditional expression (4-1) is revised as following conditional expression (4-1 ") and satisfies this further amended conditional expression (4-1 "):
0.4＜f 1/f t＜0.68…(4-1”)。
Only the upper limit of conditional expression (4-1) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-1 ') or (4-1 ").
Because the present invention is intended to reduce size, as stated, so the refractive index of the positive element in first lens unit is often stronger, and therefore aberration maybe be bigger.In this case, making that the refractive index of lens is high as far as possible helps obtaining enough aberration performances.This makes that the curvature of lens surface is littler and makes it possible to suppress in minimum, needed refractive index to be provided in the generation with aberration.
Specifically, the expression formula (4-2) that preferably meets the following conditions:
1.70＜nd 1p＜2.20…(4-2)
Nd wherein 1pBe that positive element in first lens unit is to the refractive index of d line.
If do not surpass the upper limit of conditional expression (4-2), can make that then the cost of glass material is lower, and can make that the availability of glass material is higher.If surpass the lower limit of conditional expression (4-2), prevented that then the refractive index of the positive element in first lens unit is low excessively, and prevented that the curvature of lens surface of this positive element is too high.This helps reducing aberration, is especially taking the photograph spherical aberration and the coma aberration that far-end produces.
More preferably, the top conditional expression that provides (4-2) is revised as following conditional expression (4-2 ') and satisfies this amended conditional expression (4-2 '):
1.71＜nd 1p＜1.90…(4-2’)。
In addition, more preferably, conditional expression (4-2) is revised as following conditional expression (4-2 ") and satisfies this further amended conditional expression (4-2 "):
1.74＜nd 1p＜1.78…(4-2”)。
Only the upper limit of conditional expression (4-2) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-2 ') or (4-2 ").
In addition, in above-mentioned zoom lens, more preferably, adopt in the following characteristic one or some according to fourth aspect present invention.
In order to obtain enough aberration performances, preferably, the lens element in first lens unit is designed to have the shape of following appointment.Preferably, the negative lens element in first lens unit has the concave surface towards the picture side, and positive element has the convex surface towards the thing side.Therefore through these characteristics, can make that the incident angle of light on positive element is less, and can make that off-axis aberration (for example bending of the coma aberration of wide-angle side and visual field and spherical aberration and the coma aberration of taking the photograph far-end) is less.In this case, preferably meet the following conditions expression formula (4-3) and (4-4):
0.5＜R 1pf/f 1p＜10.0…(4-3)
-2.0＜R 1nr/f 1n＜-0.10…(4-4)
R wherein 1pfBe the paraxial radius-of-curvature of the thing side surface of the positive element in first lens unit, and f 1pBe the focal length of the positive element in first lens unit, R 1nrBe the paraxial radius-of-curvature of the picture side surface of the negative lens element in first lens unit, and f 1nIt is the focal length of the negative lens element in first lens unit.
If surpass the upper limit of conditional expression (4-3), then prevented the curvature step-down of the thing side surface of positive element, and it can have enough positive refractive index, this helps reducing the whole length of zoom lens.If surpass the lower limit of conditional expression (4-3), prevented that then curvature from uprising, this helps reducing off-axis aberration, for example bending of the coma aberration of wide-angle side and visual field and spherical aberration and the coma aberration of taking the photograph far-end.
If do not surpass the upper limit of conditional expression (4-4), then prevented the curvature step-down of the picture side surface of the negative lens element in first lens unit.This quantitative change that helps preventing the aberration that negative lens element produces must be greater than eliminating the needed amount of aberration that positive element produces.If do not surpass the lower limit of conditional expression (4-4), then negative lens element can have enough negative indexes.This helps eliminating satisfactorily the aberration that the positive element in first lens unit produces.
More preferably, the top conditional expression that provides (4-3) is revised as following conditional expression (4-3 ') and satisfies this amended conditional expression (4-3 '):
0.65＜R 1pf/f 1p＜6.0…(4-3’)。
In addition, more preferably, conditional expression (4-3) is revised as following conditional expression (4-3 ") and satisfies this further amended conditional expression (4-3 "):
0.77＜R 1pf/f 1p＜1.6…(4-3”)。
Only the upper limit of conditional expression (4-3) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-3 ') or (4-3 ").
More preferably, the top conditional expression that provides (4-4) is revised as following conditional expression (4-4 ') and satisfies this amended conditional expression (4-4 '):
-1.00＜R 1nr/f 1n＜-0.19…(4-4’)。
In addition, more preferably, conditional expression (4-4) is revised as following conditional expression (4-4 ") and satisfies this further amended conditional expression (4-4 "):
-0.32＜R 1nr/f 1n＜-0.22…(4-4”)。
Only the upper limit of conditional expression (4-4) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-4 ') or (4-4 ").
The lens that negative lens element in first lens unit and positive element can be bonded with each other and engage to constitute.Use the lens that engage like this to make it possible to effectively chromatic aberation on the axis calibration, chromatic aberation possibly be harmful on this axle when the focal length of taking the photograph far-end increases along with the increase of zoom ratio.In addition, use the lens that engage to make it possible to reduce the centrifugal relatively optical performance degradation that causes of the lens element that causes owing to assembly error, therefore help to improve turnout and reduce cost.
Negative lens element in first lens unit can be mutual asynthetic independence (or separation) lens element with positive element.This structure makes it possible to more effectively proofread and correct the distortion and the coma aberration of wide-angle side and the coma aberration of taking the photograph far-end through utilizing the air lens that form between these two lens.
Zoom lens according to fourth aspect present invention can be made up of following four lens units from thing side arranged in sequence: have positive refractive index first lens unit, have second lens unit of negative index, the 4th lens unit that has the 3rd lens unit of positive refractive index and have positive refractive index.In this case, preferably, aperture diaphragm is provided in Zoom lens optical system; And during from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; The 4th lens unit moves, and aperture diaphragm moves.
Zoom lens according to fourth aspect present invention can be made up of following five lens units from thing side arranged in sequence: have positive refractive index first lens unit, have second lens unit of negative index, the 3rd lens unit, the 5th lens unit that has the 4th lens unit of negative index and have positive refractive index with positive refractive index.In this case, preferably, aperture diaphragm is provided in Zoom lens optical system; And during from wide-angle side to the zoom of taking the photograph far-end, first lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; The 4th lens unit moves, and the 5th lens unit moves, and aperture diaphragm moves.
Through moving all lens units as described above, can provide convergent-divergent to change function to each lens unit effectively, even and therefore when field angle and zoom ratio increase, also can obtain excellent properties.Move aperture diaphragm and make the chromatic aberation that effectively to proofread and correct convergent-divergent and distortion being provided at the advantage on the performance, and can suitably control the position of entrance pupil and the position of emergent pupil.This means can obtain wide-angle side from the light height of Axial Bundle and take the photograph far-end from the well balanced between the light height of Axial Bundle, and the external diameter that can under the situation of well balanced, make the lens unit of winning is with the most less near the external diameter of the lens unit that looks like side.Particularly at the wide-angle side place, the reducing of the external diameter of first lens unit advantageously causes lens to reduce in the size of the thickness direction direction of optical axis (that is, along).In addition; Because can be controlled in the variation of exit pupil position during the zoom (be convergent-divergent change) or can make that it is less; So can the incident angle of light on CCD or cmos sensor etc. be remained in the proper range, can prevent brightness in the outer regions of picture region descend (or concealment) thus.Therefore, zoom lens are suitable for using with the electronic image pickup device.
For reach that size reduces and the aberration performance between balance, preferably, second lens unit expression formula that meets the following conditions:
0.02＜|f 2/f t|＜0.50…(4-5)
F wherein 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If surpass the upper limit of conditional expression (4-5), the refractive index that has then prevented second lens unit excessively a little less than, this helps reducing the size of whole lens combination.If do not surpass the lower limit of conditional expression (4-5), prevented that then the refractive index of second lens unit is strong excessively, this helps reducing the off-axis aberration and the spherical aberration of taking the photograph far-end of wide-angle side.
More preferably, the top conditional expression that provides (4-5) is revised as following conditional expression (4-5 ') and satisfies this amended conditional expression (4-5 '):
0.08＜|f 2/f t|＜0.36…(4-5’)。
In addition, more preferably, conditional expression (4-5) is revised as following conditional expression (4-5 ") and satisfies this further amended conditional expression (4-5 "):
0.10＜|f 2/f t|＜0.16…(4-5”)。
Only the upper limit of conditional expression (4-5) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-5 ') or (4-5 ").
Preferably, form by nine or still less lens element according to the zoom lens of fourth aspect present invention.The increase of number of lens elements will cause the cost of zoom lens and the increase of size.
Preferably, according to the zoom lens of the fourth aspect present invention expression formula that meets the following conditions:
5.0＜f t/f w＜30.0…(4-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
If surpass the upper limit of conditional expression (4-6), then be difficult to through adopting structure to obtain enough optical properties according to fourth aspect present invention.If surpass the lower limit of conditional expression (4-6), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost that joins with structurally associated according to fourth aspect present invention.
More preferably, the top conditional expression that provides (4-6) is revised as following conditional expression (4-6 ') and satisfies this amended conditional expression (4-6 '):
6.5＜f t/f w＜20.0…(4-6’)。
In addition, more preferably, conditional expression (4-6) is revised as following conditional expression (4-6 ") and satisfies this further amended conditional expression (4-6 "):
9.0＜f t/f w＜15.0…(4-6”)。
Only the upper limit of conditional expression (4-6) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-6 ') or (4-6 ").
Preferably, the zoom lens according to fourth aspect present invention satisfy following conditional expression:
0.50＜I mw/f w＜1.00…(4-7)
I wherein MwBe the maximum image height degree of the wide-angle side of zoom lens, and f wBe the focal lengths of zoom lens in wide-angle side.
If surpass the upper limit of conditional expression (4-7), then be difficult to through adopting structure to obtain enough optical properties according to fourth aspect present invention.If surpass the lower limit of conditional expression (4-7), then available simpler structure realizes the object of the invention, and therefore can not enjoy the advantage on size and cost that joins with structurally associated according to fourth aspect present invention.
More preferably, the top conditional expression that provides (4-7) is revised as following conditional expression (4-7 ') and satisfies this amended conditional expression (4-7 '):
0.60＜I mw/f w＜0.95…(4-7’)。
In addition, more preferably, conditional expression (4-7) is revised as following conditional expression (4-7 ") and satisfies this further amended conditional expression (4-7 "):
0.70＜I mw/f w＜0.80…(4-7”)。
Only the upper limit of conditional expression (4-7) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-7 ') or (4-7 ").
In order to realize that size reduces and good aberration performance, preferably, according to the zoom lens of the fourth aspect present invention expression formula that meets the following conditions:
5.0＜L t/I mw＜22.5…(4-8)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of zoom lens.
If surpass the upper limit of conditional expression (4-8), prevented that then the whole length of zoom-lens system is long, this helps reducing the size of lens frame under the state that lens barrel folds.If do not surpass the lower limit of conditional expression (4-8), prevented that then the refractive index of each lens unit is strong excessively, this helps obtaining good aberration correction.
More preferably, the expression formula that meets the following conditions:
8.0＜L t/I mw＜17.5…(4-8’)。
More preferably, the expression formula that meets the following conditions:
11.5＜L t/I mw＜14.5…(4-8”)。
Only the upper limit of conditional expression (4-8) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-8 ') or (4-8 ").
Be beneficial to the electronic image pickup apparatus that reduces size and acquisition high zoom ratios and wide visual field angle when keeping the excellent picture quality of institute's captured image no through using the picture that will form to convert the image pick-up element of electric signal into, can providing according to the zoom lens of fourth aspect present invention difficultly.
Be similar to situation according to the zoom lens of fourth aspect present invention; Positive element in first lens unit only comprises under the situation about having relatively than a positive element of strong refraction rate; Preferably; The glass material that will have high index of refraction is used for this positive element, so that the filtergram residual quantity is less, as previously mentioned.
On the other hand, from the angle of correcting colour aberration, use glass material disadvantageous often with high index of refraction.This be because, in the existing glass material, exist the refractive index of glass material high more, its Abbe number is more little trend just, and be difficult to provide between positive element and the negative lens element in first lens unit enough difference of Abbe number.For the enough difference of Abbe number is provided between positive element in first lens unit and the negative lens element, can in negative lens element, use glass material with littler Abbe number.Yet the Abbe number of glass material is more little, and its partial dispersion is higher more than often.Therefore, use this glass material to cause the increase of the chromatic aberation in the relative shorter wavelength scope that negative lens element produces.For example, though feasible less with respect to the d line for the chromatic aberation of c line and f line, also very big for the chromatic aberation of g line.
Specifically, the chromatic aberation of convergent-divergent possibly be significant problem, and its deleterious effect increases the feasible thus convergent-divergent chromatic aberation and the well balanced of taking the photograph the convergent-divergent chromatic aberation of far-end that is difficult to obtain wide-angle side along with the increase of the field angle of wide-angle side.
Consider this situation; In order to obtain to have the image that improves picture quality; Preferably, image transitions portion is provided, its electrical signal conversion that will represent the picture of zoom lens formation is the picture signal of wherein having proofreaied and correct the color imbalance that is caused by the convergent-divergent chromatic aberation through Flame Image Process.It is fuzzy and improve resolution that the electronic calibration of this chromatic aberation to zoom lens makes it possible to reduce color in institute's captured image.
In common electronic still video camera, be the image of three primary colours (i.e. first primary colours, second primary colours and three primary colours) with the separation of images of object, and through calculating each output signal that superposes, thereby reproduce coloured image.Zoom lens have under the situation of convergent-divergent chromatic aberation therein, if the image of first primary lights is used as benchmark, the image of second primary lights and three primary colours light formation position will be shifted with the image formation position of first primary lights to some extent so.
For the chromatic aberation of the convergent-divergent of correcting image electronically, can be based on about the information of zoom lens aberration and in advance obtaining the displacement of the picture position of second primary lights and three primary colours light with respect to the picture position of first primary lights for each pixel of image pick-up element.Can come to carry out coordinate transform with respect to the mode of the displacement of the picture position of first primary lights by correction for each pixel of institute's captured image.For example; Image is exported under the situation that signals form by red (R) passage, green (G) passage and blueness (B) passage three therein; Can be in advance for the displacement of the picture position in each pixel acquisition R and the B passage apart from the picture position in the G passage; And can carry out the displacement of coordinate transform, and R and B signal after the exportable correction to institute's captured image with the picture position in the correction distance G passage.
Because depending on zoom position, focal position and stop value, the chromatic aberation of convergent-divergent changes; So preferably, will be stored in the memory storage as correction data for the picture position of second and the three primary colours of each lens position (being zoom position, focal position and stop value) displacement with respect to the picture position of first primary colours.Can come with reference to this correction data according to zoom position.Therefore, exportable second and the tristimulus signals of having proofreaied and correct with respect to the displacement of first primary colour signal.
Optical aberration correction and the electronics aberration correction in the video camera in the cooperation ground use zoom lens is effective in the following manner.Can in positive element, use glass material so that monochromatic aberration is less with high index of refraction.In this lens element, use glass material to cause the Abbe number less with high index of refraction.For reducing of the difference that compensates the Abbe number between positive element and the negative lens element, can in negative lens element, use glass material, so that the enough difference with respect to the Abbe number of positive element to be provided thus with littler Abbe number.Therefore, can in zoom lens, proofread and correct the chromatic aberation of the convergent-divergent about wavelength coverage admirably from the c line to the f line.Near and the convergent-divergent chromatic aberation that is shorter than in the wavelength coverage (wherein owing in negative lens element, use the increase of the partial dispersion ratio that glass material with little Abbe number causes will produce a large amount of convergent-divergent chromatic aberations) of g line can mainly proofread and correct by the electronics mode.Therefore, can when reducing size and increasing zoom ratio, obtain the good optical performance.
Each passage of image pick-up element is sensitive in the wavelength coverage of certain width.For example; Under the situation of the CCD with primary colours filtrator; The R passage is sensitive in about wavelength coverage from 550nm to 700nm, and the G passage is sensitive in about wavelength coverage from 450nm to 600nm, and B passage sensitivity in about wavelength coverage from 400nm to 500nm.If in these wavelength coverages, fail chromatic aberation is corrected to a certain degree optically,, can not realize the minimizing that color is fuzzy or the improvement of resolution as expected even then carry out electronic calibration.Consider this situation, preferably, in zoom lens, carry out optical correction the convergent-divergent chromatic aberation by the mode of the expression formula that meets the following conditions:
2.0＜|Δc 07-Δf 07|/p＜15.0…(4-9)
2.0＜|Δg 10|/p＜15.0…(4-10)
Δ c wherein 07, Δ f 07, and Δ g 07Be respectively at 70% the image height degree c of place line, f line and the g line that equal maximum diagonal angle image height degree amount, Δ g with respect to the convergent-divergent chromatic aberation of d line 10Be that the image height degree g of place line is with respect to the amount of the convergent-divergent chromatic aberation of d line at maximum diagonal angle, and p is the pel spacing of image pick-up element.
If above the conditional expression (4-9) and the upper limit (4-10), then in each passage, obtain enough chromatic aberations and proofread and correct, this obtains to reduce color advantage fuzzy and improvement resolution for enjoyment through electronic calibration is preferred.If surpass conditional expression (4-9) and lower limit (4-10), then need not carry out electronic calibration to the chromatic aberation of convergent-divergent.
More preferably, the top conditional expression that provides (4-9) is revised as following conditional expression (4-9 ') and satisfies this amended conditional expression (4-9 '):
2.5＜|Δc 07-Δf 07|/p＜12.0…(4-9’)。
In addition, more preferably, conditional expression (4-9) is revised as following conditional expression (4-9 ") and satisfies this further amended conditional expression (4-9 "):
3.0＜|Δc 07-Δf 07|/p＜5.0…(4-9”)。
Only the upper limit of conditional expression (4-9) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-9 ') or (4-9 ").
More preferably, the top conditional expression that provides (4-10) is revised as following conditional expression (4-10 ') and satisfies this amended conditional expression (4-10 '):
2.5＜|Δg 10|/p＜12.0…(4-10’)。
In addition, more preferably, conditional expression (4-10) is revised as following conditional expression (4-10 ") and satisfies this further amended conditional expression (4-10 "):
3.0＜|Δg 10|/p＜7.0…(4-10”)。
Only the upper limit of conditional expression (4-10) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-10 ') or (4-10 ").
In relatively short wavelength coverage, the amount of the chromatic aberation of convergent-divergent often increases along with the position becomes away from optical axis tempestuously.In order to be implemented in through simple algorithm near proofreading and correct the convergent-divergent chromatic aberation under the convergent-divergent chromatic aberation at the image height degree place of intermediary image height and the situation near well balanced between the convergent-divergent chromatic aberation at the image height degree place of maximum image height degree; Preferably, make that the variation of amount of the convergent-divergent chromatic aberation between the different image height degree is as far as possible little.Specifically, preferably in lens unit, proofread and correct the chromatic aberation of convergent-divergent by the mode of the expression formula that meets the following conditions:
|Δg 10-Δg 07|/p＜12.0…(4-11)
Δ g wherein 07Be at the convergent-divergent colour residual quantity of 70% the image height degree g of the place line that equals maximum diagonal angle image height degree with respect to the d line, Δ g 10Be that the image height degree g of place line is with respect to the convergent-divergent colour residual quantity of d line at maximum diagonal angle, and p is the pel spacing (pixel pitch) of image pick-up element.
If surpass the upper limit of conditional expression (4-11), then can make near the chromatic aberation of the convergent-divergent at the image height degree place of intermediary image height and less near the difference between the convergent-divergent chromatic aberation at the image height degree place of maximum image height degree.This helps simplifying the algorithm that is used for the electron gain correcting value.This also helps and reduces the circuit size that is used to proofread and correct, helps reducing the load of computing, and helps improving processing speed.
More preferably, the top conditional expression that provides (4-11) is revised as following conditional expression (4-11 ') and satisfies this amended conditional expression (4-11 '):
|Δg 10-Δg 07|/p＜8.0…(4-11’)。
In addition, more preferably, conditional expression (4-11) is revised as following conditional expression (4-11 ") and satisfies this further amended conditional expression:
|Δg 10-Δg 07|/p＜5.0…(4-11”)。
Only the upper limit of conditional expression (4-11) or lower limit can be replaced by the upper limit or the lower limit of conditional expression (4-11 ') or (4-11 ").
In addition, image transitions portion is provided preferably, the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by the zoom lens according to fourth aspect present invention is the picture signal of wherein having proofreaied and correct distortion.Therefore, allow in the picture that zoom lens form, to leave distortion.This provides the quantity that reduces the lens element in the zoom lens and has made the littler further advantage of size of zoom lens.
In order to satisfy the user for than the in the past needs of the shot region of kind widely; The present invention can provide a kind of zoom lens and device according to its fourth aspect; These zoom lens and device help obtaining the reducing of video camera size, higher zoom ratio and wideer field angle; And be suitable for using, and can not have the image with excellent picture quality is provided difficultly with electronic image pickup device such as CCD or cmos sensor.
Below, with the embodiment that is described in detail with reference to the attached drawings according to zoom lens of the present invention and image pick-up device.Yet, should be appreciated that to the invention is not restricted to these embodiments.
Below, with the first to the 15 embodiment of describing according to zoom lens of the present invention.Figure 1A, 1B, 1C, 1D and 1E are that zoom lens according to the first to the 15 embodiment focus at zoom lens under the state on the object point of unlimited distance respectively in wide-angle side (Figure 1A is to 15A), at (Figure 1B is to 15B) under the first middle focal length state, at (Fig. 1 C is to 15C) under the second middle focal length state, under the 3rd middle focal length state (Fig. 1 D is to 15D) and at the sectional view of taking the photograph far-end (Fig. 1 E is to 15E) to 15A, 15B, 15C, 15D and 15E.In 15E, first lens unit is represented that by G1 second lens unit is represented by G2 at Figure 1A; Aperture diaphragm is represented by S; The 3rd lens unit is represented that by G3 the 4th lens unit is represented by G4, has applied on it to cover or reduce infrared light and has been represented by F with the face parallel-plate that the wavelength coverage that constitutes optical low-pass filter limits coating; The face parallel-plate that constitutes the cover glass of electronic image pickup device is represented by C, and is represented by I as the plane.Cover plate C can be coated with the laminated coating that is used for the wavelength coverage restriction in its surface.Can cover plate C be designed to have the function of optical low-pass filter.
All numeric datas given below all are to focus on the state on the object of unlimited distance to zoom lens wherein.In these numeric datas, diameter is that unit and angle expenditure are unit with mm (millimeter).In all embodiments, focus near lens unit as side through moving.In first to the 9th embodiment all, image height degree IH is 3.88mm.Will be in wide-angle side (WE), provide the zoom data at first to the 3rd middle focal length state (being respectively ST1, ST2 and ST3) and at the state of taking the photograph far-end (TE).
Like Figure 1A to shown in the 1E; Zoom lens according to first embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used in two surfaces, the second lens unit G2 of the double-concave negative lens among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Fig. 2 A to shown in the 2E; Zoom lens according to second embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used in two surfaces, the second lens unit G2 of the double-concave negative lens among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Fig. 3 A to shown in the 3E; Zoom lens according to the 3rd embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
By the order from the thing side, the first lens unit G1 is made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface.By the order from the thing side, the second lens unit G2 is made up of towards the positive concave-convex lens and the double-concave negative lens of picture side double-concave negative lens, convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used in two surfaces, the second lens unit G2 of the double-concave negative lens among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Fig. 4 A to shown in the 4E; Zoom lens according to the 4th embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near among two surfaces of the double-concave negative lens of thing side, the second lens unit G2 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Fig. 5 A to shown in the 5E; Zoom lens according to the 5th embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near among two surfaces of the double-concave negative lens of thing side, the second lens unit G2 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Fig. 6 A to shown in the 6E; Zoom lens according to the 6th embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By order from the thing side; The second lens unit G2 is made up of two following joint lens: first engages lens is made up of towards the positive concave-convex lens of thing side double-concave negative lens and convex surface, and second joint lens is made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used for convex surface among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 in the picture side surface of the positive concave-convex lens of thing side, the second lens unit G2 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have seven aspheric surfaces.
Like Fig. 7 A to shown in the 7E; Zoom lens according to the 7th embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The move mode of each lens unit is not limited to those above-mentioned modes.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near among two surfaces of the double-concave negative lens of thing side, the second lens unit G2 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Fig. 8 A to shown in the 8E; Zoom lens according to the 8th embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 is only towards the thing side shifting, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The move mode of each lens unit is not limited to those above-mentioned modes.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of biconvex positive lens and double-concave negative lens.By the order from the thing side, the 3rd lens unit G3 is made up of towards the negative meniscus lens of thing side biconvex positive lens and convex surface.The 4th lens unit G4 is made up of towards the positive concave-convex lens of picture side convex surface.
Aspheric surface is used in two surfaces, the second lens unit G2 of the double-concave negative lens among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near the picture side surface of the double-concave negative lens of picture side, two surfaces, the convex surface among the 3rd lens unit G3 of biconvex positive lens among the 3rd lens unit G3 towards the picture side surface of the negative meniscus lens of thing side and the convex surface among the 4th lens unit G4 towards the picture side surface of the positive concave-convex lens of picture side, promptly have eight aspheric surfaces.
Like Fig. 9 A to shown in the 9E; Zoom lens according to the 9th embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end; The first lens unit G1 is only towards the thing side shifting; The second lens unit G2 is along moving towards the protruding track of thing side, and the 3rd lens unit G3 is only towards the thing side shifting, and the 4th lens unit G4 is only towards the picture side shifting.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens of thing side double-concave negative lens and convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near two surfaces of the double-concave negative lens of thing side, the picture side surface, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3 of positive concave-convex lens among the second lens unit G2, promptly have eight aspheric surfaces.
Like Figure 10 A to shown in the 10E; Zoom lens according to the tenth embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of picture side towards the positive concave-convex lens and the convex surface of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of biconvex positive lens and double-concave negative lens.The 4th lens unit G4 is made up of the biconvex positive lens.
Promptly there are eight aspheric surfaces in two surfaces, the convex surface among the second lens unit G2 that aspheric surface are used for the double-concave negative lens among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 towards the picture side surface of the negative meniscus lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3.
Like Figure 11 A to shown in the 11E; Zoom lens according to the 11 embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used in two surfaces, the second lens unit G2 of the double-concave negative lens among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Figure 12 A to shown in the 12E; Zoom lens according to the 12 embodiment have: have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, have the 3rd lens unit G3 of positive refractive index, the 5th lens unit G5 that has the 4th lens unit G4 of negative index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end; The first lens unit G1 is only towards the thing side shifting; The second lens unit G2 is along moving towards the protruding track of thing side, and the 3rd lens unit G3 is only towards the thing side shifting, and the 4th lens unit G4 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 5th lens unit G5 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.The 3rd lens unit G3 is made up of the biconvex positive lens.The 4th lens unit G4 engages lens and forms, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 5th lens unit G5 is made up of the biconvex positive lens.
Aspheric surface is used in two surfaces, the second lens unit G2 of the double-concave negative lens among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 5th lens unit G5 of biconvex positive lens among the 3rd lens unit G3, promptly exist eight non-balls to.
Like Figure 13 A to shown in the 13E; Zoom lens according to the 13 embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near among two surfaces of the double-concave negative lens of thing side, the second lens unit G2 near the picture side surface of the double-concave negative lens of picture side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have eight aspheric surfaces.
Like Figure 14 A to shown in the 14E; Zoom lens according to the 14 embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of with the joint lens towards the negative meniscus lens of thing side convex surface, and said joint lens are made up of towards the positive concave-convex lens and the double-concave negative lens of picture side convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the negative meniscus lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used for the picture side surface of the double-concave negative lens of convex surface among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1, two surfaces of the biconvex positive lens among the 3rd lens unit G3 and two surfaces of the biconvex positive lens among the 4th lens unit G4, promptly has eight aspheric surfaces towards two surfaces of the negative meniscus lens of thing side, among the second lens unit G2.
Like Figure 15 A to shown in the 15E; Zoom lens according to the 15 embodiment have: the 4th lens unit G4 that have the first lens unit G1 of positive refractive index, the second lens unit G2 with negative index, aperture diaphragm S, has the 3rd lens unit G3 of positive refractive index and have positive refractive index, they are arranged by said sequence from the thing side.
During from wide-angle side to the zoom of taking the photograph far-end, the first lens unit G1 is only towards the thing side shifting, and the second lens unit G2 moves along the track towards thing side convexity, and the 3rd lens unit G3 is only towards the thing side shifting.During the zoom of wide-angle side zoom position in the middle of certain, the 4th lens unit G4 is along towards moving as the protruding track of side, and during from this centre zoom position to the zoom of taking the photograph far-end, it moves along the track towards thing side convexity.
The first lens unit G1 forms by engaging lens, and said joint lens are made up of towards the negative meniscus lens and the biconvex positive lens of thing side convex surface by the order from the thing side.By the order from the thing side, the second lens unit G2 is made up of double-concave negative lens and joint lens, and said joint lens are made up of towards the positive concave-convex lens of thing side double-concave negative lens and convex surface.By the order from the thing side, the 3rd lens unit G3 is made up of biconvex positive lens and joint lens, and said joint lens are made up of towards the negative meniscus lens of thing side towards the positive concave-convex lens and the convex surface of thing side convex surface.The 4th lens unit G4 is made up of the biconvex positive lens.
Aspheric surface is used among picture side surface, the second lens unit G2 of biconvex positive lens of the first lens unit G1 near in two surfaces of the double-concave negative lens of thing side, the thing side surface, the second lens unit G2 of another (or adjacent) double-concave negative lens among the second lens unit G2 near the convex surface of picture side towards the picture side surface of the positive concave-convex lens of thing side, two surfaces and two surfaces of the biconvex positive lens among the 4th lens unit G4 of biconvex positive lens among the 3rd lens unit G3, promptly have nine aspheric surfaces.
The numeric data of each above-mentioned embodiment is shown below.Except above-mentioned symbol, f representes the focal length of whole zoom-lens system, F NOExpression F numbering, ω representes half image angle, WE representes wide-angle side; ST representes intermediateness; TE representes to take the photograph far-end, each r1, r2 ... represent the radius-of-curvature of each lens surface, each d1, d2 ... the distance between two lens represented; Each nd1, nd2 ... represent the refractive index of each lens to the d line, and each vd1, vd2 ... the Abbe number of each lens represented.
Be through back focus being added to the whole length of the lens combination of describing subsequently from first lens surface length that obtains of the distance of lens surface to the last.BF (back focus) be from last lens surface up to the distance on paraxial picture plane based on the air unit that (air conversion) represent that converts.
When make x be with the direction of propagation of light for the optical axis of just (direction) and to make y be along perpendicular to the direction of this optical axis the time, through following expression formula aspheric shape is described.
x＝(y 2/r)/[1+{1-(K+1)(y/r) 2} 1/2]+A 4y 4+A 6y 6+A 8y 8+A 10y 10+A 12y 12
Wherein, r representes paraxial radius-of-curvature, and K representes circular cone coefficient, A 4, A 6, A 8, A 10, and A 12The asphericity coefficient of representing quadravalence, six rank, eight rank, ten rank and ten second orders respectively.And, in asphericity coefficient, " e-n " (wherein, n is an integer) expression " 10 -n".
In addition, in order to remove or to cover the harmful light that possibly cause mirage phantom, lens flare etc., except aperture diaphragm, spuious diaphragm (flare stop) can be provided also.
Said spuious diaphragm can be arranged on the thing side of first lens unit, between first lens unit and second lens unit, between second lens unit and the 3rd lens unit, between the 3rd lens unit and the 4th lens unit, between the 4th lens unit and the 5th lens unit, or between the lens unit and picture plane near the picture side.Can adopt members of frame to remove spurious rays.Alternatively, independent parts can be provided for this purpose.Can spuious diaphragm be provided through direct printing, coating or through pasting thin slice on the parts of optical system.The aperture of spuious diaphragm can have different shape, and for example circle, ellipse, rectangle or polygon perhaps, can define the shape in aperture through the curve by the mathematical function appointment.Spuious diaphragm not only can be removed harmful light beam, and can remove the light beam of the coma aberration dazzle in the outer regions that possibly cause picture region.
It is desirable to, through moving the most approaching focusing that is used to regulate the focal position as the lens unit of side.Because the weight near the lens unit of picture side is the lightest, make that the load of motor is littler so focus on by this lens unit.In addition, focus on by this lens unit and to help making the lens frame miniaturization, because the whole length of zoom lens does not change and drive motor can be arranged in the lens frame during focusing on.Although preferably by focusing near lens unit, also can focus on as stated by the first, second, third or the 4th lens unit as side.Alternatively, can focus on through moving a plurality of lens units.Alternatively, can focus on through advancing whole lens combination.Alternatively, can focus on through movable part lens forward or backward.
Can be through moving brightness in the outer regions that lenticule in the ccd sensor reduce image descend (or concealment).For example, can change the lenticular design in the ccd sensor according to the incident angle of light at corresponding image height degree place.
Can come the brightness in the outer regions of correcting image to descend through Flame Image Process.
In the 16 to the 30 embodiment, be respectively applied for the image pick-up device of function according to the zoom lens of the first to the 15 embodiment with electronic calibration distortion, wherein, the shape of AP picking region changes during zoom.Therefore, in the 16 to the 30 embodiment, the image height degree of zoom position and field angle are different from image height degree and the field angle in each corresponding embodiment.Each image pick-up device is equipped with following zoom lens: these zoom lens have the angle of half field-of view ω greater than 34 degree in wide-angle side.In the 16 to the 30 embodiment, proofread and correct the barrel distortion that occurs in the wide-angle zoom position electronically, and write down or show and carried out the image of proofreading and correct thus.
In the zoom lens according to these embodiments, in wide-angle side, on rectangle photoelectricity conversion table face barrel distortion appears.Yet, taking the photograph far-end and, suppressing distortion at zoom position near the middle focal length state.For correcting distortion electronically, the AP picking region is designed to have barrel-shaped and have rectangular shape at the middle focal length state with taking the photograph far-end in wide-angle side.In addition, through using the image transitions of Flame Image Process, convert the AP picking region that is provided with in advance into reduced distortion rectangular image information.Image height degree IH with wide-angle side wBe designed to image height degree IH less than the middle focal length state sWith the image height degree IH that takes the photograph far-end t
In the 16 to the 30 embodiment; Design effective image pickup zone as follows: make the size than short side direction of AP picking region of wide-angle side equal the size than minor face on opto-electronic conversion surface, and remaining about-3% distortion Flame Image Process after.Certainly, can be set to the AP picking region less than the barrel-shaped zone of above-mentioned zone, but and recoding/reproduction convert this zone into rectangular area and the image that produces.
Can anti-reflection coating be coated to each lens element to reduce mirage phantom and dazzle.It preferably applies the overbrushing layer, because can reduce mirage phantom and dazzle effectively.In addition, can with infrared cutting coating be coated on the lens surface or the cover plate surface first-class.
In addition, for preventing mirage phantom and dazzle, usually anti-reflection coating is coated to the surface of the lens that contact with air.
On the other hand, on the composition surface that engages lens, the refractive index of bonding agent is very high than the refractive index of air.Therefore, in many cases, reflection coefficient is the rank of signal layer coating or lower originally, and under situation seldom applying coating.Yet,, and obtain more gratifying image even when butt joint is closed face and also applied anti-reflection coating energetically, can further reduce mirage phantom and dazzle.
Specifically, recently, in the optical system of video camera, used glass material widely, so that aberration correction is produced bigger effect with high index of refraction.Yet when the glass material that will have high index of refraction was used as the joint lens, the reflection on the composition surface became very important.In this case, it is especially effective on the composition surface, applying anti-reflection coating.
Open the 2001-324676 communique japanese kokai publication hei 2-27301 communique, spy, the spy opens the effective use that discloses the composition surface coating in No. 7116482 patent of the 2005-92115 communique and the U.S..In these patent documentations; Described the joint lens surface coating in first lens unit of positive aforementioned zoom-lens system, and can implement as disclosed joint lens surface coating in these patent documentations the joint lens surface in first lens unit with positive multiplying power of the present invention.
As the coating material that will use, according to the refractive index of adhesive material with as the refractive index of the lens of substrate, the coating material that can suitably select to have relative high index, for example Ta 2O 5, TiO 2, Nb 2O 5, ZrO 2, HfO 2, CeO 2, SnO 2, In 2O 3, ZnO and Y 2O 3, and the coating material with relatively low refractive index, for example MgF 2, SiO 2And Al 2O 3, and it is set to satisfy the film thickness of phase condition.
Naturally, be similar to the lip-deep coating of the lens of ingress of air, also can make the coating on the composition surface is laminated coating.Through suitably making up coating material and the film thickness that is no less than two-layer film number, can further reduce reflectivity and control spectral characteristic and angular characteristics.
And self-evident, for the lens composition surface the lens in first lens unit, it is effective based on similar thought coating being coated on the composition surface.
Embodiment 1
The mm of unit
Surface data
Surface number r d nd vd
1 24.448 0.80 2.00170 20.64
2 17.142 3.62 1.77250 49.60
3 *-205.108 is variable
4 * -255.591 0.80 1.83481 42.71
5 * 6.840 2.60
6 -173.737 1.63 2.10225 16.79
7 -18.519 0.80 1.83481 42.71
8 *49.763 it is variable
9(S) ∞ 0.30
10 * 5.805 2.49 1.69350 53.21
11 * -19.622 0.13
12 5.459 1.46 1.49700 81.54
13 37.187 0.78 2.00330 28.27
14 3.624 is variable
15 * 31.175 2.98 1.74330 49.33
16 *-14.538 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝6.81891e-06，A6＝2.74618e-09，A8＝-2.00369e-10，A10＝1.08689e-12
The 4th surface
k＝9.661，A4＝-1.41838e-05，A6＝-5.59393e-07，A8＝1.82188e-08，A10＝-1.50719e-10
The 5th surface
k＝0.420，A4＝3.41139e-05，A6＝5.52480e-06，A8＝-3.10379e-07，A10＝2.53040e-09
The 8th surface
k＝-1.493，A4＝-3.62339e-04，A6＝-2.34270e-06，A8＝1.00616e-07，A10＝-6.28966e-09
The tenth surface
k＝1.006，A4＝-1.09878e-03，A6＝-2.81148e-05，A8＝-2.28722e-06，A10＝5.34921e-10
The 11 surface
k＝-5.208，A4＝3.43986e-04，A6＝9.45047e-06，A8＝-2.32836e-06，A10＝2.56249e-07
The 15 surface
k＝0.000，A4＝5.71049e-05，A6＝-2.81592e-06
The 16 surface
k＝0.000，A4＝1.31030e-04，A6＝-5.22363e-06，A8＝4.69431e-08
The unit focal length
f1＝31.94 f2＝-7.24 f3＝10.92 f4＝13.72
Zoom data W E ST1 ST2 ST3 TE
f(mm) 5.09 8.84 15.85 28.34 49.20
FNO. 3.22 4.16 4.92 5.67 6.00
2ω(°) 81.22 47.23 26.86 15.39 8.96
BF 5.43 4.79 5.10 4.78 4.65
Total length 42.84 46.75 52.04 56.78 57.56
d3 0.18 3.42 8.37 12.73 16.17
d8 16.03 12.14 8.57 5.70 1.75
d14 2.81 8.01 11.62 15.18 16.59
d16 3.98 3.33 3.64 3.32 3.19
Embodiment 2
The mm of unit
Surface data
Surface number r d nd vd
1 24.750 0.80 2.10225 16.79
2 19.118 3.62 1.76802 49.24
3 *-178.118 is variable
4 * -285.349 0.80 1.83481 42.71
5 * 6.941 2.47
6 -267.977 1.78 2.10225 16.79
7 -18.223 0.80 1.83481 42.71
8 *40.283 it is variable
9(S) ∞ 0.30
10 * 5.411 2.57 1.69350 53.21
11 * -22.837 0.02
12 5.448 1.46 1.49700 81.54
13 34.274 0.62 2.00330 28.27
14 3.582 is variable
15 * 36.560 3.31 1.76802 49.24
16 *-14.197 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light-receiving plane)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝7.60141e-06，A6＝-6.14494e-10，A8＝-1.66413e-10，A10＝9.96800e-13
The 4th surface
k＝9.661，A4＝-6.41121e-05，A6＝-3.75130e-07，A8＝3.89598e-08，A10＝-3.76958e-10
The 5th surface
k＝0.420，A4＝-2.06875e-05，A6＝4.78893e-06，A8＝-5.64122e-07，A10＝1.10339e-08
The 8th surface
k＝-1.493，A4＝-3.76904e-04，A6＝7.91618e-07，A8＝1.71181e-08，A10＝-5.12772e-09
The tenth surface
k＝0.971，A4＝-1.16819e-03，A6＝-2.45336e-05，A8＝-3.08002e-06，A10＝2.76241e-08
The 11 surface
k＝-4.177，A4＝6.64728e-04，A6＝3.58772e-05，A8＝-4.27344e-06，A10＝6.89037e-07
The 15 surface
k＝0.000，A4＝4.94926e-05，A6＝-3.22056e-06
The 16 surface
k＝0.000，A4＝1.33322e-04，A6＝-5.96091e-06，A8＝5.14652e-08
The unit focal length
f1＝31.90 f2＝-7.23 f3＝10.90 f4＝13.70
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.09 8.86 15.82 28.26 49.13
FNO. 3.22 4.13 4.89 5.54 6.00
2ω(°) 81.16 47.13 26.91 15.41 8.99
BF 5.48 4.97 5.21 4.97 4.65
Total length 42.76 46.51 51.93 56.47 57.47
d3 0.18 3.38 8.35 12.85 16.11
d8 15.93 11.89 8.46 5.56 1.74
d14 2.63 7.72 11.35 14.54 16.42
d16 4.02 3.52 3.76 3.52 3.19
Embodiment 3
The mm of unit
Surface data
Surface number r d nd vd
1 24.863 0.80 2.00170 20.64
2 17.312 0.10
3 17.210 3.62 1.77250 49.60
4 *-191.434 is variable
5 * -246.633 0.80 1.83481 42.71
6 * 6.889 2.58
7 -335.277 1.62 2.10225 16.79
8 -19.220 0.10
9 -17.266 0.80 1.83481 42.71
10 *57.203 it is variable
11(S) ∞ 0.30
12 * 5.805 2.49 1.69350 53.21
13 * -19.580 0.12
14 5.460 1.46 1.49700 81.54
15 36.680 0.78 2.00330 28.27
16 3.621 is variable
17 * 30.856 2.96 1.74330 49.33
18 *-14.638 is variable
19 ∞ 0.40 1.54771 62.84
20 ∞ 0.50
21 ∞ 0.50 1.51633 64.14
22 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 4th surface
k＝0.000，A4＝7.34610e-06，A6＝3.10401e-09，A8＝-2.13114e-10，A10＝1.21240e-12
The 5th surface
k＝9.661，A4＝1.06284e-05，A6＝-1.57115e-06，A8＝3.70202e-08，A10＝-2.77466e-10
The 6th surface
k＝0.420，A4＝2.60126e-05，A6＝4.72986e-06，A8＝-4.04118e-07，A10＝3.41610e-09
The tenth surface
k＝-1.493，A4＝-3.50300e-04，A6＝-1.64241e-06，A8＝1.22037e-07，A10＝-6.35735e-09
The 12 surface
k＝1.007，A4＝-1.10618e-03，A6＝-2.77540e-05，A8＝-2.42568e-06，A10＝9.10635e-09
The 13 surface
k＝-5.208，A4＝3.37105e-04，A6＝9.77823e-06，A8＝-2.56919e-06，A10＝2.74290e-07
The 17 surface
k＝0.000，A4＝6.21981e-05，A6＝-2.54082e-06
The 18 surface
k＝0.000，A4＝1.38383e-04，A6＝-5.28746e-06，A8＝5.23493e-08
The unit focal length
f1＝31.90 f2＝-7.24 f3＝10.92 f4＝13.74
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.09 8.83 15.82 28.27 49.16
FNO. 3.23 4.16 4.93 5.67 6.00
2ω(°) 80.92 47.17 26.89 15.43 8.98
BF 5.45 4.81 5.13 4.82 4.68
Total length 42.97 46.89 52.18 56.91 57.69
d4 0.18 3.42 8.36 12.73 16.17
d10 16.03 12.14 8.57 5.70 1.75
d16 2.80 7.98 11.59 15.14 16.56
d18 3.99 3.36 3.67 3.36 3.22
Embodiment 4
The mm of unit
Surface data
Surface number r d nd vd
1 24.339 0.80 2.00170 20.64
2 17.110 3.62 1.77250 49.60
3 *-202.575 is variable
4 * -177.740 0.80 1.83481 42.71
5 * 6.950 2.59
6 -163.766 1.61 2.10225 16.79
7 -18.781 0.80 1.83481 42.71
8 *50.365 it is variable
9(S) ∞ 0.30
10 * 5.888 2.49 1.69350 53.21
11 * -20.595 0.13
12 5.424 1.46 1.49700 81.54
13 32.252 0.78 2.00330 28.27
14 3.641 is variable
15 * 27.021 2.98 1.74330 49.33
16 * -14.981 0.00
17 ∞ are variable
18 ∞ 0.40 1.54771 62.84
19 ∞ 0.50
20 ∞ 0.50 1.51633 64.14
21 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝6.92624e-06，A6＝-4.15511e-09，A8＝-1.07707e-10，A10＝6.92597e-13
The 4th surface
k＝9.661，A4＝-5.69038e-06，A6＝-7.03182e-07，A8＝2.57624e-08，A10＝-2.53661e-10
The 5th surface
k＝0.420，A4＝7.71420e-05，A6＝6.38529e-06，A8＝-3.31172e-07，A10＝4.46651e-09
The 8th surface
k＝-1.493，A4＝-3.79273e-04，A6＝-4.05713e-06，A8＝2.48706e-07，A10＝-9.23062e-09
The tenth surface
k＝1.109，A4＝-1.12706e-03，A6＝-3.54246e-05，A8＝-1.41383e-06，A10＝-7.53254e-08
The 11 surface
k＝-6.647，A4＝3.14775e-04，A6＝-7.34049e-06，A8＝8.54655e-07，A10＝3.16244e-08
The 15 surface
k＝0.000，A4＝7.18255e-05，A6＝-2.29705e-06
The 16 surface
k＝0.000，A4＝1.37632e-04，A6＝-3.98775e-06，A8＝3.38066e-08
The unit focal length
f1＝31.73 f2＝-7.24 f3＝11.12 f4＝13.37
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.08 8.75 16.50 28.17 49.11
FNO. 3.26 4.19 5.21 5.68 6.00
2ω(°) 81.52 47.76 25.91 15.46 8.96
BF 5.52 4.92 4.27 4.86 4.65
Total length 42.88 46.89 51.74 56.92 57.54
d3 0.18 3.43 8.19 12.76 16.17
d8 16.03 12.20 8.42 5.75 1.75
d14 2.80 7.97 12.29 15.17 16.59
d17 4.06 3.46 2.81 3.40 3.19
Embodiment 5
The mm of unit
Surface data
Surface number r d nd vd
1 26.484 0.80 1.94595 17.98
2 19.039 3.57 1.76802 49.24
3 *-142.037 is variable
4 * -83.779 0.80 1.85135 40.10
5 * 7.043 2.45
6 -209.901 1.82 1.94595 17.98
7 -14.409 0.70 1.76802 49.24
8 *59.068 it is variable
9(S) ∞ 0.30
10 * 5.492 2.38 1.69350 53.21
11 * -18.302 0.10
12 5.217 1.46 1.49700 81.54
13 34.074 0.51 2.00330 28.27
14 3.421 is variable
15 * 25.754 2.63 1.76802 49.24
16 *-16.836 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝7.85007e-06，A6＝6.48772e-10，A8＝-1.78686e-10，A10＝9.92964e-13
The 4th surface
k＝9.661，A4＝3.86707e-05，A6＝-9.71266e-07，A8＝4.00322e-08，A10＝-4.59818e-10
The 5th surface
k＝0.487，A4＝3.15015e-05，A6＝6.21890e-06，A8＝-5.15861e-07，A10＝1.52931e-08
The 8th surface
k＝-1.686，A4＝-3.65583e-04，A6＝-2.14376e-06，A8＝9.39262e-08，A10＝-8.53029e-09
The tenth surface
k＝1.266，A4＝-1.65072e-03，A6＝-5.88005e-05，A8＝-5.46088e-06，A10＝-2.59951e-07
The 11 surface
k＝-6.076，A4＝1.19118e-04，A6＝4.57799e-06，A8＝-7.41918e-06，A10＝5.32189e-07
The 15 surface
k＝0.000，A4＝7.57492e-05，A6＝-5.18922e-07
The 16 surface
k＝0.000，A4＝1.02405e-04，A6＝-1.89883e-06，A8＝2.69622e-08
The unit focal length
f1＝31.70 f2＝-7.19 f3＝10.94 f4＝13.62
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.12 8.76 15.93 28.29 48.96
FNO. 3.30 4.23 5.00 5.62 6.01
2ω(°) 80.52 47.40 26.73 15.35 9.02
BF 5.40 4.85 5.16 4.86 4.82
Total length 42.12 46.19 51.75 56.15 56.94
d3 0.22 3.62 8.54 13.19 16.42
d8 15.50 11.82 8.18 5.41 1.39
d14 3.49 8.39 12.35 15.18 16.80
d16 3.94 3.40 3.71 3.40 3.36
Embodiment 6
The mm of unit
Surface data
Surface number r d nd vd
1 26.198 0.80 2.00170 20.64
2 17.942 3.62 1.77250 49.60
3 *-154.362 is variable
4 -144.967 0.60 1.81600 46.62
5 5.980 0.30 1.63494 23.22
6 * 7.011 2.75
7 -89.617 1.36 2.10225 16.79
8 -20.683 0.70 1.83481 42.71
9 *148.535 it is variable
10(S) ∞ 0.30
11 * 5.462 2.38 1.69350 53.21
12 * -20.953 0.10
13 5.602 1.46 1.49700 81.54
14 39.362 0.70 2.00330 28.27
15 3.555 is variable
16 * 22.339 2.63 1.76802 49.24
17 *-18.692 is variable
18 ∞ 0.40 1.54771 62.84
19 ∞ 0.50
20 ∞ 0.50 1.51633 64.14
21 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝6.47947e-06，A6＝-1.14895e-10，A8＝-7.34270e-11，A10＝2.62802e-13
The 6th surface
k＝0.487，A4＝6.04053e-05，A6＝7.39262e-06，A8＝-3.44043e-07，A10＝2.04347e-09
The 9th surface
k＝-2.956，A4＝-3.38640e-04，A6＝-8.97078e-07，A8＝6.18615e-08，A10＝-5.19623e-09
The 11 surface
k＝0.983，A4＝-1.18677e-03，A6＝-3.05018e-05，A8＝-3.05952e-06，A10＝5.76584e-08
The 12 surface
k＝-9.993，A4＝4.92954e-04，A6＝2.24028e-05，A8＝-3.36465e-06，A10＝5.75191e-07
The 16 surface
k＝0.000，A4＝6.91126e-05，A6＝-1.44097e-06
The 17 surface
k＝0.000，A4＝9.80410e-05，A6＝-3.86622e-06，A8＝4.27893e-08
The unit focal length
f1＝32.98 f2＝-7.48 f3＝11.03 f4＝13.63
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.12 8.82 15.93 28.29 49.12
FNO. 3.31 4.22 5.07 5.81 6.00
2ω(°) 80.02 47.02 26.78 15.44 8.97
BF 5.15 4.76 4.95 4.80 4.71
Total length 42.77 46.29 51.85 56.78 57.16
d3 0.20 3.69 8.52 13.20 17.05
d9 16.21 12.00 8.32 5.37 1.25
d15 3.53 8.15 12.37 15.72 16.45
d17 3.69 3.30 3.49 3.34 3.25
Embodiment 7
The mm of unit
Surface data
Surface number r d nd vd
1 25.246 0.80 2.00170 20.64
2 17.504 3.62 1.77250 49.60
3 *-153.282 is variable
4 * -305.214 0.80 1.83481 42.71
5 * 6.969 2.49
6 -113.524 1.41 2.10225 16.79
7 -17.342 0.80 1.83481 42.71
8 *47.705 it is variable
9(S) ∞ 0.30
10 * 5.785 2.49 1.69350 53.21
11 *-18.928 is variable
12 5.454 1.46 1.49700 81.54
13 39.519 0.75 2.00330 28.27
14 3.569 is variable
15 * 23.547 2.89 1.74330 49.33
16 *-15.630 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝7.44440e-06，A6＝-8.33092e-09，A8＝-3.71821e-11，A10＝2.91551e-13
The 4th surface
k＝9.661，A4＝-4.32718e-05，A6＝-6.38714e-07，A8＝1.71954e-08，A10＝-9.58527e-11
The 5th surface
k＝0.420，A4＝4.73224e-05，A6＝4.90359e-06，A8＝-3.23846e-07，A10＝-8.16179e-09
The 8th surface
k＝-1.493，A4＝-3.78547e-04，A6＝-4.88735e-06，A8＝4.57516e-07，A10＝-1.06817e-08
The tenth surface
k＝1.107，A4＝-1.22603e-03，A6＝-4.54873e-05，A8＝-1.89979e-06，A10＝-8.94718e-08
The 11 surface
k＝-5.742，A4＝2.69445e-04，A6＝-1.08481e-05，A8＝-9.14413e-07，A10＝1.47216e-07
The 15 surface
k＝0.000，A4＝7.97694e-05，A6＝-1.04934e-06
The 16 surface
k＝0.000，A4＝1.25993e-04，A6＝-1.93046e-06，A8＝1.76452e-08
The unit focal length
f1＝31.77 f2＝-7.19 f3＝6.66 f4＝-7.01 f5＝13.05
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.11 8.74 15.91 28.38 49.06
FNO. 3.27 4.16 5.05 5.70 6.00
2ω(°) 80.17 47.41 26.71 15.33 8.98
BF 5.47 4.86 4.80 4.62 4.72
Total length 42.62 46.19 51.27 56.36 57.18
d3 0.18 3.42 8.11 12.68 16.18
d8 16.03 12.06 8.40 5.72 1.74
d11 0.11 0.21 0.32 0.28 0.26
d14 3.03 7.84 11.83 15.27 16.48
d16 4.01 3.40 3.34 3.16 3.26
Embodiment 8
The mm of unit
Surface data
Surface number r d nd vd
1 21.904 0.80 1.92286 18.90
2 15.598 3.50 1.74320 49.34
3 *-364.392 is variable
4 * -65.692 0.80 1.83481 42.71
5 * 4.791 2.33
6 29.098 1.54 1.94595 17.98
7 -17.375 0.60 1.83481 42.71
8 *23.863 it is variable
9(S) ∞ 0.30
10 * 4.239 2.70 1.49700 81.54
11 * -11.441 0.10
12 6.648 0.70 2.00170 20.64
13 *4.236 it is variable
14 -33.457 1.50 1.74320 49.34
15 * -12.642 0.00
16 ∞ are variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝8.76629e-06，A6＝-1.37971e-08
The 4th surface
k＝0.000，A4＝1.11297e-03，A6＝-5.43425e-05，A8＝1.17052e-06，A10＝-1.01620e-08
The 5th surface
k＝0.000，A4＝1.54233e-03，A6＝5.60992e-05，A8＝-3.36931e-06，A10＝-1.08279e-08
The 8th surface
k＝0.000，A4＝-7.67930e-04，A6＝-1.87891e-05，A8＝-1.16081e-07，A10＝-8.50836e-10
The tenth surface
k＝0.000，A4＝-1.24286e-03，A6＝-7.89741e-05，A8＝-3.23347e-06，A10＝-7.17385e-08
The 11 surface
k＝0.000，A4＝-3.26412e-04，A6＝-1.72582e-05，A8＝1.59265e-06，A10＝-3.09326e-08
The 13 surface
k＝0.000，A4＝1.41264e-03，A6＝9.83944e-05
The 15 surface
k＝0.000，A4＝3.00000e-05
The unit focal length
f1＝30.55 f2＝-5.35 f3＝9.32 f4＝26.40
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 4.94 8.39 14.40 26.69 47.06
FNO. 3.50 4.47 5.15 4.73 6.00
2ω(°) 82.28 49.93 29.25 16.04 9.36
FB 8.12 7.65 7.28 6.45 5.64
Total length 36.78 40.30 47.08 52.79 58.36
d3 0.36 2.69 8.20 13.65 15.58
d8 10.46 7.06 5.31 3.56 1.37
d13 2.98 8.03 11.42 14.25 20.90
d16 7.04 6.58 6.21 5.39 4.58
Embodiment 9
The mm of unit
Surface data
Surface number r d nd vd
1 26.824 0.80 1.94595 17.98
2 19.346 3.57 1.76802 49.24
3 *-154.401 is variable
4 * -128.260 0.80 1.85135 40.10
5 * 6.303 2.50
6 -279.380 0.70 1.72916 54.68
7 18.472 1.06 2.10225 16.79
8 *76.616 it is variable
9(S) ∞ 0.30
10 * 5.755 2.38 1.69350 53.21
11 * -18.998 0.10
12 5.340 1.46 1.49700 81.54
13 22.667 0.51 2.00330 28.27
14 3.587 is variable
15 * 22.674 2.63 1.76802 49.24
16 *-20.422 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝7.12229e-06，A6＝9.11239e-09，A8＝-2.77095e-10，A10＝1.37494e-12
The 4th surface
k＝0.000，A4＝-1.91222e-05，A6＝-8.95933e-07，A8＝3.48869e-08，A10＝-3.07714e-10
The 5th surface
k＝0.000，A4＝1.45289e-04，A6＝1.20898e-05，A8＝-5.45063e-07，A10＝5.13417e-09
The 8th surface
k＝0.000，A4＝-2.92513e-04，A6＝-2.92168e-06，A8＝1.95347e-07，A10＝-4.02860e-09
The tenth surface
k＝0.000，A4＝-5.66147e-04，A6＝-5.92936e-06，A8＝-1.97982e-06，A10＝1.47438e-07
The 11 surface
k＝0.000，A4＝3.01744e-04，A6＝4.10563e-06，A8＝-3.64960e-06，A10＝3.09816e-07
The 15 surface
k＝0.000，A4＝4.35091e-05，A6＝-2.12004e-06
The 16 surface
k＝0.000，A4＝5.32277e-05，A6＝-4.48825e-06，A8＝4.83770e-08
The unit focal length
f1＝32.43 f2＝-7.23 f3＝11.02 f4＝14.37
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.11 8.76 15.96 28.39 49.04
FNO. 3.35 4.30 5.16 5.72 6.00
2ω(°) 81.05 47.66 26.67 15.26 8.96
BF 5.49 4.89 4.57 4.61 4.67
Total length 41.64 45.80 51.92 56.19 56.76
d3 0.24 3.70 8.89 13.71 17.14
d8 15.50 11.75 8.65 5.56 1.48
d14 3.60 8.64 12.99 15.50 16.66
d16 4.03 3.43 3.11 3.16 3.21
Embodiment 10
The mm of unit
Surface data
Surface number r d nd vd
Object plane ∞ ∞
1 26.057 0.90 1.92286 20.88
2 20.324 3.80 1.58913 61.14
3 *-90.043 is variable
4 * -228.052 0.80 1.85135 40.10
5 * 6.471 3.38
6 -49.444 1.78 1.94595 17.98
7 -13.033 0.70 1.74320 49.34
8 *-200.000 is variable
9(S) ∞ 0.00
10 * 6.084 3.32 1.59201 67.02
11 * -14.229 0.14
12 8.776 1.88 1.49700 81.54
13 -6.821 0.39 1.61293 37.00
14 4.070 is variable
15 * 22.340 2.72 1.52542 55.78
16 * -16.652 0.00
17 ∞ are variable
18 ∞ 0.40 1.51633 64.14
19 ∞ 0.50
20 ∞ 0.50 1.51633 64.14
21 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
K＝0.000
A4＝7.76723e-06，A6＝-5.17775e-09，A8＝-3.05628e-11，A10＝3.05364e-13，A12＝-1.22198e-15
The 4th surface
K＝0.000
A4＝5.91800e-05，A6＝-2.71411e-06，A8＝2.98672e-08，A10＝-2.27323e-10
The 5th surface
K＝0.000
A4＝2.01000e-04，A6＝7.54437e-06，A8＝-3.08734e-07，A10＝1.56410e-08，A12＝-8.56105e-10
The 8th surface
K＝0.000
A4＝-2.82631e-04，A6＝-6.23538e-06，A8＝4.00871e-07，A10＝-1.47767e-08，A12＝2.95296e-10
The tenth surface
K＝0.000
A4＝-4.86039e-04，A6＝-8.24264e-06，A8＝6.61180e-07，A10＝-7.89566e-08，A12＝2.77593e-09
The 11 surface
K＝0.000
A4＝3.02859e-04，A6＝-7.10097e-06，A8＝1.24832e-06，A10＝-1.31994e-07，A12＝5.25802e-09
The 15 surface
K＝0.000
A4＝5.85000e-05，A6＝-1.20206e-06，A8＝-7.74180e-28
The 16 surface
K＝0.000
A4＝2.70961e-05，A6＝-2.27806e-06，A8＝3.88946e-28
The unit focal length
f1＝39.37 f2＝-7.56 f3＝11.52 f4＝18.60
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.09 8.84 15.45 28.06 49.11
FNO. 3.24 4.30 5.17 5.65 6.02
2ω(°) 81.12 47.49 27.60 15.37 8.88
Image height degree 3.88 3.83 3.83 3.83 3.83
BF 6.12 4.96 5.51 5.74 5.43
Total length 44.97 48.88 55.42 62.74 65.89
d3 0.30 3.56 9.14 16.53 21.35
d8 15.75 11.28 7.52 4.79 1.64
d14 2.98 9.27 13.44 15.87 17.67
d17 4.59 3.47 4.02 4.24 3.91
Embodiment 11
The mm of unit
Surface data
Surface number r d nd vd
1 23.150 0.80 2.10225 16.79
2 18.554 3.50 1.69350 53.21
3 *-123.339 is variable
4 * -90.927 0.80 1.83481 42.71
5 * 7.048 2.48
6 -1266.286 1.64 2.10225 16.79
7 -20.159 0.80 1.83481 42.71
8 *45.980 it is variable
9(S) ∞ 0.30
10 * 5.509 2.74 1.69350 53.21
11 * -20.746 0.02
12 5.150 1.46 1.49700 81.54
13 21.650 0.40 2.00330 28.27
14 3.456 is variable
15 * 46.848 3.28 1.76802 49.24
16 * -14.048 0.00
17 ∞ are variable
18 ∞ 0.40 1.54771 62.84
19 ∞ 0.50
20 ∞ 0.50 1.51633 64.14
21 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝9.42966e-06，A6＝-1.39631e-09，A8＝-1.83250e-10，A10＝1.09250e-12
The 4th surface
k＝0.000，A4＝1.82511e-05，A6＝1.01175e-07，A8＝-2.98947e-09
The 5th surface
k＝0.420，A4＝5.25802e-05，A6＝6.14527e-06，A8＝-3.73155e-07，A10＝9.45056e-09
The 8th surface
k＝0.000，A4＝-3.62054e-04，A6＝1.24874e-07，A8＝-1.06766e-07，A10＝-2.94196e-09
The tenth surface
k＝0.000，A4＝-5.73729e-04，A6＝-4.44838e-06，A8＝-2.33375e-06，A10＝1.73331e-07
The 11 surface
k＝0.000，A4＝3.93312e-04，A6＝3.45965e-06，A8＝-3.57062e-06，A10＝3.52884e-07
The 15 surface
k＝0.000，A4＝4.51650e-05，A6＝-3.05790e-06
The 16 surface
k＝0.000，A4＝1.02788e-04，A6＝-5.60166e-06，A8＝5.10869e-08
The unit focal length
f1＝32.05 f2＝-7.30 f3＝11.00 f4＝14.41
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.85 15.85 28.27 49.16
FNO. 3.21 4.14 4.88 5.58 6.00
2ω(°) 80.70 47.19 26.94 15.48 9.03
BF 5.67 4.91 5.27 4.94 4.67
Total length 42.89 46.71 51.83 56.40 57.43
d3 0.18 3.40 8.39 12.86 16.21
d8 16.12 12.18 8.48 5.59 1.72
d14 2.71 8.00 11.47 14.80 16.62
d17 4.21 3.45 3.82 3.48 3.21
Embodiment 12
The mm of unit
Surface data
Surface number r d nd vd
1 24.764 0.80 2.10225 16.79
2 19.124 3.62 1.76802 49.24
3 *-179.186 is variable
4 * -285.754 0.80 1.83481 42.71
5 * 7.075 2.43
6 -181.865 1.66 2.10225 16.79
7 -18.046 0.80 1.83481 42.71
8 *37.195 it is variable
9(S) 0.30
10 * 5.451 2.54 1.69350 53.21
11 *-22.369 is variable
12 5.367 1.46 1.49700 81.54
13 44.307 0.59 2.00330 28.27
14 3.586 is variable
15 * 27.914 3.24 1.76802 49.24
16 *-15.386 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝7.40763e-06，A6＝-4.51297e-09，A8＝-1.21322e-10，A10＝8.60726e-13
The 4th surface
k＝9.661，A4＝-9.35774e-05，A6＝1.71199e-06，A8＝2.91403e-09，A10＝-1.86109e-10
The 5th surface
k＝0.420，A4＝-2.83857e-05，A6＝4.80878e-06，A8＝-5.87642e-07，A10＝1.52660e-08
The 8th surface
k＝-1.493，A4＝-3.69280e-04，A6＝2.24600e-06，A8＝1.60947e-08，A10＝-6.38051e-09
The tenth surface
k＝1.063，A4＝-1.24122e-03，A6＝-3.06956e-05，A8＝-3.12274e-06，A10＝-4.08825e-08
The 11 surface
k＝-4.382，A4＝6.02183e-04，A6＝2.88488e-05，A8＝-4.06429e-06，A10＝6.22236e-07
The 15 surface
k＝0.000，A4＝7.41118e-05，A6＝-2.05696e-06
The 16 surface
k＝0.000，A4＝1.27914e-04，A6＝-3.62263e-06，A8＝2.93175e-08
The unit focal length
f1＝31.95 f2＝-7.11 f3＝6.57 f4＝-6.99 f5＝13.35
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.74 15.79 28.13 49.31
FNO. 3.25 4.10 4.89 5.55 6.00
2ω(°) 80.48 47.63 26.96 15.47 8.95
BF 5.60 5.08 5.08 4.91 4.65
Total length 42.89 46.13 51.35 56.24 57.49
d3 0.18 3.38 8.19 12.78 16.12
d8 16.00 11.81 8.28 5.55 1.80
d11 0.04 0.16 0.26 0.25 0.27
d14 2.84 7.46 11.29 14.52 16.42
d16 4.14 3.62 3.63 3.45 3.19
Embodiment 13
The mm of unit
Surface data
Surface number r d nd vd
1 24.090 0.80 2.00170 20.64
2 16.881 3.62 1.77250 49.60
3 *-237.720 is variable
4 * 19139.546 0.80 1.83481 42.71
5 * 7.022 2.48
6 -246.009 1.43 2.10225 16.79
7 -18.939 0.80 1.83481 42.71
8 *36.202 it is variable
9(S) 0.30
10 * 5.737 2.49 1.69350 53.21
11 * -75.021 0.37
12 7.276 1.46 1.65160 58.55
13 6.906 0.79 2.10225 16.79
14 3.848 is variable
15 * 33.027 2.99 1.74330 49.33
16 *-13.749 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝6.30333e-06，A6＝2.48277e-09，A8＝-1.15085e-10，A10＝5.00853e-13
The 4th surface
k＝9.661，A4＝-6.45703e-05，A6＝-3.41266e-07，A8＝2.96809e-08，A10＝-2.94996e-10
The 5th surface
k＝0.420，A4＝2.39561e-05，A6＝4.75914e-06，A8＝-4.61329e-07，A10＝1.26489e-08
The 8th surface
k＝-1.493，A4＝-3.85138e-04，A6＝-1.26117e-06，A8＝6.50838e-09，A10＝-5.27597e-09
The tenth surface
k＝1.007，A4＝-7.28139e-04，A6＝-8.13409e-06，A8＝-1.80592e-06，A10＝1.36333e-07
The 11 surface
k＝-10.317，A4＝9.53729e-04，A6＝4.31457e-05，A8＝-1.37217e-06，A10＝6.57763e-07
The 15 surface
k＝0.000，A4＝4.17738e-05，A6＝-1.04874e-06
The 16 surface
k＝0.000，A4＝1.13058e-04，A6＝-2.39178e-06，A8＝2.38835e-08
The unit focal length
f1＝32.01 f2＝-7.24 f3＝11.03 f4＝13.43
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.78 15.75 28.21 49.21
FNO. 3.27 4.19 4.94 5.67 6.00
2ω(°) 81.26 47.58 27.12 15.52 8.99
BF 5.44 4.88 5.26 4.84 4.54
Total length 43.00 46.88 52.10 56.83 57.45
d3 0.18 3.45 8.37 12.76 16.18
d8 16.03 12.17 8.49 5.69 1.76
d14 3.02 8.04 11.65 15.20 16.64
d16 3.98 3.42 3.80 3.38 3.09
Embodiment 14
The mm of unit
Surface data
Surface number r d nd vd
1 24.090 0.80 2.00170 20.64
2 16.881 3.62 1.77250 49.60
3 *-237.720 is variable
4 * 19139.546 0.80 1.83481 42.71
5 * 7.022 2.48
6 -246.009 1.43 2.10225 16.79
7 -18.939 0.80 1.83481 42.71
8 *36.202 it is variable
9(S) 0.30
10 * 5.737 2.49 1.69350 53.21
11 * -75.021 0.37
12 7.276 1.46 1.65160 58.55
13 6.906 0.79 2.10225 16.79
14 3.848 is variable
15 * 33.027 2.99 1.74330 49.33
16 *-13.749 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝6.30333e-06，A6＝2.48277e-09，A8＝-1.15085e-10，A10＝5.00853e-13
The 4th surface
k＝9.661，A4＝-6.45703e-05，A6＝-3.41266e-07，A8＝2.96809e-08，A10＝-2.94996e-10
The 5th surface
k＝0.420，A4＝2.39561e-05，A6＝4.75914e-06，A8＝-4.61329e-07，A10＝1.26489e-08
The 8th surface
k＝-1.493，A4＝-3.85138e-04，A6＝-1.26117e-06，A8＝6.50838e-09，A10＝-5.27597e-09
The tenth surface
k＝1.007，A4＝-7.28139e-04，A6＝-8.13409e-06，A8＝-1.80592e-06，A10＝1.36333e-07
The 11 surface
k＝-10.317，A4＝9.53729e-04，A6＝4.31457e-05，A8＝-1.37217e-06，A10＝6.57763e-07
The 15 surface
k＝0.000，A4＝4.17738e-05，A6＝-1.04874e-06
The 16 surface
k＝0.000，A4＝1.13058e-04，A6＝-2.39178e-06，A8＝2.38835e-08
The unit focal length
f1＝32.01 f2＝-7.24 f3＝11.03 f4＝13.43
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.78 15.75 28.21 49.21
FNO. 3.27 4.19 4.94 5.67 6.00
2ω(°) 81.26 47.58 27.12 15.52 8.99
BF 5.44 4.88 5.26 4.84 4.54
Total length 43.00 46.88 52.10 56.83 57.45
d3 0.18 3.45 8.37 12.76 16.18
d8 16.03 12.17 8.49 5.69 1.76
d14 3.02 8.04 11.65 15.20 16.64
d16 3.98 3.42 3.80 3.38 3.09
Embodiment 15
The mm of unit
Surface data
Surface number r d nd vd
1 126.649 0.80 1.94595 17.98
2 19.024 3.57 1.76802 49.24
3 *-131.627 is variable
4 * -76.902 0.80 1.85135 40.10
5 * 6.873 2.45
6 * -49.076 0.70 1.76802 49.24
7 18.933 1.76 2.10225 16.79
8 *226.488 it is variable
9(S) 0.30
10 * 5.456 2.38 1.69350 53.21
11 * -19.210 0.10
12 5.302 1.46 1.49700 81.54
13 27.733 0.51 2.00330 28.27
14 3.419 is variable
15 * 25.975 2.63 1.76802 49.24
16 *-16.829 is variable
17 ∞ 0.40 1.54771 62.84
18 ∞ 0.50
19 ∞ 0.50 1.51633 64.14
20 ∞ 0.37
Picture plane (light receiving surface)
Aspherical surface data
The 3rd surface
k＝0.000，A4＝7.94392e-06，A6＝5.89517e-09，A8＝-2.47525e-10，A10＝1.30153e-12
The 4th surface
k＝0.000，A4＝9.88808e-06，A6＝-2.28574e-06，A8＝7.63451e-08，A10＝-6.47994e-10
The 5th surface
k＝0.000，A4＝2.28618e-04，A6＝1.24535e-05，A8＝-5.66191e-07，A10＝4.27110e-08
The 6th surface
k＝0.000，A4＝3.04014e-04，A6＝-7.11000e-07，A8＝8.93657e-07，A10＝-1.62614e-08
The 8th surface
k＝0.000，A4＝-9.92982e-05，A6＝-2.54438e-06，A8＝4.71636e-07，A10＝-1.99720e-08
The tenth surface
k＝0.000，A4＝-6.50584e-04，A6＝-1.72392e-05，A8＝-1.40723e-06，A10＝4.91904e-08
The 11 surface
k＝0.000，A4＝3.18580e-04，A6＝-1.69612e-05，A8＝-1.30044e-06，A10＝1.11576e-07
The 15 surface
k＝0.000，A4＝6.38253e-05，A6＝-1.25797e-06
The 16 surface
k＝0.000，A4＝8.12873e-05，A6＝-2.41254e-06，A8＝2.35806e-08
The unit focal length
f1＝31.53 f2＝-7.19 f3＝10.99 f4＝13.66
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.11 8.70 15.87 28.19 49.05
FNO. 3.29 4.22 4.99 5.61 6.00
2ω(°) 81.29 47.79 26.84 15.41 9.00
BF 5.46 4.92 5.21 4.89 4.74
Total length 42.11 46.17 51.75 56.11 56.88
d3 0.25 3.62 8.56 13.20 16.42
d8 15.50 11.83 8.20 5.41 1.40
d14 3.44 8.35 12.33 15.15 16.86
d16 4.00 3.46 3.75 3.43 3.29
The zoom lens that use in the 16 embodiment are with identical according to the zoom lens of first embodiment.
The zoom lens that use in the 17 embodiment are with identical according to the zoom lens of second embodiment.
The zoom lens that use in the 18 embodiment are with identical according to the zoom lens of the 3rd embodiment.
The zoom lens that use in the 19 embodiment are with identical according to the zoom lens of the 4th embodiment.
The zoom lens that use in the 20 embodiment are with identical according to the zoom lens of the 5th embodiment.
The zoom lens that use in the 21 embodiment are with identical according to the zoom lens of the 6th embodiment.
The zoom lens that use in the 22 embodiment are with identical according to the zoom lens of the 7th embodiment.
The zoom lens that use in the 23 embodiment are with identical according to the zoom lens of the 8th embodiment.
The zoom lens that use in the 24 embodiment are with identical according to the zoom lens of the 9th embodiment.
The zoom lens that use in the 25 embodiment are with identical according to the zoom lens of the tenth embodiment.
The zoom lens that use in the 26 embodiment are with identical according to the zoom lens of the 11 embodiment.
The zoom lens that use in the 27 embodiment are with identical according to the zoom lens of the 12 embodiment.
The zoom lens that use in the 28 embodiment are with identical according to the zoom lens of the 13 embodiment.
The zoom lens that use in the 29 embodiment are with identical according to the zoom lens of the 14 embodiment.
The zoom lens that use in the 30 embodiment are with identical according to the zoom lens of the 15 embodiment.
Image height degree in the 16 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.09 8.84 15.85 28.34 49.20
FNO. 3.22 4.16 4.92 5.67 6.00
2ω(°) 78.29 47.23 26.86 15.39 8.96
Image height degree 3.70 3.88 3.88 3.88 3.88
Image height degree in the 17 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.09 8.86 15.82 28.26 49.13
FNO. 3.22 4.13 4.89 5.54 6.00
2ω(°) 78.23 47.13 26.91 15.41 8.99
Image height degree 3.70 3.88 3.88 3.88 3.88
Image height degree in the 18 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.09 8.83 15.82 28.27 49.16
FNO. 3.23 4.16 4.93 5.67 6.00
2ω(°) 78.19 47.17 26.89 15.43 8.98
Image height degree 3.71 3.88 3.88 3.88 3.88
Image height degree in the 19 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.08 8.75 16.50 28.17 49.11
FNO. 3.26 4.19 5.21 5.68 6.00
2ω(°) 78.59 47.76 25.91 15.46 8.96
Image height degree 3.70 3.88 3.88 3.88 3.88
Image height degree in the 20 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.12 8.76 15.93 28.29 48.96
FNO. 3.30 4.23 5.00 5.62 6.01
2ω(°) 77.87 47.40 26.73 15.35 9.02
Image height degree 3.71 3.88 3.88 3.88 3.88
Image height degree in the 21 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.12 8.82 15.93 28.29 49.12
FNO. 3.31 4.22 5.07 5.81 6.00
2ω(°) 77.71 47.02 26.78 15.44 8.97
Image height degree 3.73 3.88 3.88 3.88 3.88
Image height degree in the 22 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.11 8.74 15.91 28.38 49.06
FNO. 3.27 4.16 5.05 5.70 6.00
2ω(°) 77.93 47.41 26.71 15.33 8.98
Image height degree 3.74 3.88 3.88 3.88 3.88
Image height degree in the 23 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 4.94 8.39 14.40 26.69 47.06
FNO. 3.50 4.47 5.15 4.73 6.00
2ω(°) 79.88 49.93 29.25 16.04 9.36
Image height degree 3.73 3.88 3.88 3.88 3.88
Image height degree in the 24 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.11 8.76 15.96 28.39 49.04
FNO. 3.35 4.30 5.16 5.72 6.00
2ω(°) 78.14 47.66 26.67 15.26 8.96
Image height degree 3.70 3.88 3.88 3.88 3.88
Image height degree in the 25 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.09 8.84 15.45 28.06 49.11
FNO. 3.24 4.30 5.17 5.65 6.02
2ω(°) 75.59 47.47 27.59 15.36 8.88
Image height degree 3.52 3.83 3.83 3.83 3.83
Image height degree in the 26 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.85 15.85 28.27 49.16
FNO. 3.21 4.14 4.88 5.58 6.00
2ω(°) 78.05 47.19 26.94 15.48 9.03
Image height degree 3.72 3.88 3.88 3.88 3.88
Image height degree in the 27 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.74 15.79 28.13 49.31
FNO. 3.25 4.10 4.89 5.55 6.00
2ω(°) 78.00 47.63 26.96 15.47 8.95
Image height degree 3.72 3.88 3.88 3.88 3.88
Image height degree in the 28 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.78 15.75 28.21 49.21
FNO. 3.27 4.19 4.94 5.67 6.00
2ω(°) 78.14 47.58 27.12 15.52 8.99
Image height degree 3.69 3.88 3.88 3.88 3.88
Image height degree in the 29 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.10 8.78 15.75 28.21 49.21
FNO. 3.27 4.19 4.94 5.67 6.00
2ω(°) 78.14 47.58 27.12 15.52 8.99
Image height degree 3.69 3.88 3.88 3.88 3.88
Image height degree in the 30 embodiment is as follows with the data of total image angle.
The zoom data
WE ST1 ST2 ST3 TE
f(mm) 5.11 8.70 15.87 28.19 49.05
FNO. 3.29 4.22 4.99 5.61 6.00
2ω(°) 78.19 47.79 26.84 15.41 9.00
Image height degree 3.68 3.88 3.88 3.88 3.88
Figure 16 A is that zoom lens according to the first to the 15 embodiment focus on the aberration diagram under the state on the object point of unlimited distance at zoom lens to 45E.These aberration diagrams are in spherical aberration (SA), astigmatism (AS), distortion (DT) and convergent-divergent chromatic aberation (CC) that wide-angle side has been shown in the 44A with Figure 16 A of suffix " A " numbering; Figure 16 B with suffix " B " numbering has illustrated spherical aberration (SA), astigmatism (AS), distortion (DT) and the convergent-divergent chromatic aberation (CC) under the first middle focal length state in 44B; Figure 16 C with suffix " C " numbering has illustrated spherical aberration (SA), astigmatism (AS), distortion (DT) and the convergent-divergent chromatic aberation (CC) under the second middle focal length state in 44C; Figure 17 D with suffix " D " numbering has illustrated spherical aberration (SA), astigmatism (AS), distortion (DT) and the convergent-divergent chromatic aberation (CC) under the 3rd middle focal length state in 45D, and in 45E, spherical aberration (SA), astigmatism (AS), distortion (DT) and the convergent-divergent chromatic aberation (CC) of taking the photograph far-end has been shown at Figure 17 E with suffix " E " numbering.In these figure, symbol " ω " is represented angle of half field-of view.
Conditional expression (1-1) is as follows to the value of (1-9).
Embodiment 1 embodiment 2 embodiment 3 embodiment 4 embodiment 5
(1-1)∑d2G/I mw
1.503 1.508 1.519 1.494 1.486
(1-2)N 2ave 1.924 1.924 1.924 1.924 1.855
(1-3)f 2/f t 0.147 0.147 0.147 0.147 0.147
(1-4)f 2/R 22f 0.042 0.027 0.022 0.044 0.034
(1-5)f 2/R 23r -0.146 -0.180 -0.127 -0.144 -0.122
(1-6)SF 21 0.948 0.953 0.946 0.925 0.845
(1-7)f 1/f t 0.649 0.649 0.649 0.646 0.647
(1-8)f t/f w 9.664 9.648 9.661 9.675 9.564
(1-9)I mw/f w 0.762 0.762 0.763 0.764 0.758
Embodiment 6 embodiment 7 embodiment 8 embodiment 9 embodiment 10
(1-1)∑d2G/I mw
1.471 1.417 1.359 1.306 1.742
(1-2)N 2ave 1.918 1.924 1.879 1.894 1.847
(1-3)f 2/f t 0.152 0.147 0.114 0.147 0.154
(1-4)f 2/R 22f -1.251 0.063 -0.184 0.026 0.153
(1-5)f 2/R 23r 0.362 -0.151 -0.224 -0.094 0.038
(1-6)SF 21 0.921 0.955 0.864 0.906 0.945
(1-7)f 1/f t 0.671 0.648 0.649 0.661 0.801
(1-8)f t/f w 9.596 9.606 9.524 9.596 9.654
(1-9)I mw/f w 0.758 0.760 0.785 0.759 0.752
Embodiment 16 embodiment 17 embodiment 18 embodiment 19 embodiment 20
(1-1)∑d2G/I mw
1.576 1.581 1.588 1.567 1.553
(1-2)N 2ave 1.924 1.924 1.924 1.924 1.855
(1-3)f 2/f t 0.147 0.147 0.147 0.147 0.147
(1-4)f 2/R 22f 0.042 0.027 0.022 0.044 0.034
(1-5)f 2/R 23r -0.146 -0.180 -0.127 -0.144 -0.122
(1-6)SF 21 0.948 0.953 0.946 0.925 0.845
(1-7)f 1/f t 0.649 0.649 0.649 0.646 0.647
(1-8)f t/f w 9.664 9.648 9.661 9.675 9.564
(1-9)I mw/f w 0.727 0.726 0.729 0.729 0.725
Embodiment 21 embodiment 22 embodiment 23 embodiment 24 embodiment 25
(1-1)∑d2G/I mw
1.529 1.471 1.414 1.370 1.742
(1-2)N 2ave 1.918 1.924 1.879 1.894 1.847
(1-3)f 2/f t 0.152 0.147 0.114 0.147 0.154
(1-4)f 2/R 22f -1.251 0.063 -0.184 0.026 0.153
(1-5)f 2/R 23r 0.362 -0.151 -0.224 -0.094 0.038
(1-6)SF 21 0.921 0.955 0.864 0.906 0.945
(1-7)f 1/f t 0.671 0.648 0.649 0.661 0.801
(1-8)f t/f w 9.596 9.606 9.524 9.596 9.654
(1-9)I mw/f w 0.729 0.732 0.755 0.724 0.691
Conditional expression (2-1) is as follows to the value of (2-11).Below, " Ex. " means " embodiment ".
Ex.2 Ex.11 Ex.12 Ex.17 Ex.26 Ex.27
(2-1)nd ln 2.102 2.102 2.102 2.102 2.102 2.102
(2-2)vd ln 16.79 16.79 16.79 16.79 16.79 6.79
(2-3)SF ln 7.79 9.07 7.78 7.79 9.07 7.78
(2-4)∑d 1G/I mw 1.139 1.108 1.139 1.195 1.157 1.187
(2-5)nd ln-nd 1p 0.334 0.409 0.334 0.334 0.409 0.334
(2-6)vd 1p-vd ln 32.45 36.42 32.45 32.45 36.42 32.45
(2-7)f 1/f t 0.649 0.652 0.648 0.649 0.652 0.648
(2-8)|f 2/f t| 0.147 0.148 0.144 0.147 0.148 0.144
(2-9)f t/f w 9.648 9.644 9.660 9.648 9.644 9.660
(2-10)I mw/f w 0.762 0.761 0.760 0.726 0.729 0.729
(2-11)L t/I mw 14.893 14.883 14.899 15.622 15.535 15.528
Conditional expression (3-1) is as follows to the value of (3-10).
Embodiment 1 embodiment 2 embodiment 3 embodiment 4 embodiment 13
(3-1)f 2/f t 0.147 -0.147 -0.147 -0.147 -0.147
(3-2)nd 2p 2.10225 2.10225 2.10225 2.10225 2.10225
(3-3)vd 2p 16.79 16.79 16.79 16.79 16.79
(3-4)SF 2p1 1.239 1.146 1.122 1.259 1.167
(3-5)SF 2p2 - - - - -
(3-6)f t/f w 9.664 9.648 9.661 9.646 9.650
(3-7)I mw/f w 0.762 0.762 0.763 0.764 0.760
(3-8)f 1/f t 0.649 0.649 0.649 0.646 0.650
(3-9)f 3/f t 0.222 0.222 0.222 0.226 0.224
(3-10)f R/f t 0.279 0.279 0.279 0.272 0.273
Embodiment 14 embodiment 9 embodiment 15 embodiment 7
(3-1)f 2/f t -0.147 -0.147 -0.147 -0.147
(3-2)nd 2p 2.10225 2.10225 2.10225 2.10225
(3-3)vd 2p 16.79 16.79 16.79 16.79
(3-4)SF 2p1 1.167 - - 1.361
(3-5)SF 2p2 - -1.635 -1.182 -
(3-6)f t/f w 9.642 9.596 9.607 9.606
(3-7)I mw/f w 0.760 0.759 0.760 0.760
(3-8)f 1/f t 0.650 0.661 0.643 0.648
(3-9)f 3/f t 0.224 0.225 0.224 0.136
(3-10)f R/f t 0.273 0.293 0.279 0.266
Embodiment 16 embodiment 17 embodiment 18 embodiment 19 embodiment 28
(3-1)f 2/f t -0.147 -0.147 -0.147 -0.147 -0.147
(3-2)nd 2p 2.10225 2.10225 2.10225 2.10225 2.10225
(3-3)vd 2p 16.79 16.79 16.79 16.79 16.79
(3-4)SF 2p1 1.239 1.146 1.122 1.259 1.167
(3-5)SF 2p2 - - - - -
(3-6)f t/f w 9.664 9.648 9.661 9.675 9.642
(3-7)I mw/f w 0.727 0.726 0.729 0.729 0.723
(3-8)f 1/f t 0.649 0.649 0.649 0.646 0.650
(3-9)f 3/f t 0.222 0.222 0.222 0.226 0.224
(3-10)f R/f t 0.279 0.279 0.279 0.272 0.273
Embodiment 29 embodiment 24 embodiment 30 embodiment 22
(3-1)f 2/f t -0.147 -0.147 -0.147 -0.147
(3-2)nd 2p 2.10225 2.10225 2.10225 2.10225
(3-3)vd 2p 16.79 16.79 16.79 16.79
(3-4)SF 2p1 1.167 - - 1.361
(3-5)SF 2p2 - -1.635 -1.182 -
(3-6)f t/f w 9.642 9.596 9.607 9.606
(3-7)I mw/f w 0.723 0.724 0.722 0.732
(3-8)f 1/f t 0.650 0.661 0.643 0.648
(3-9)f 3/f t 0.224 0.225 0.224 0.136
(3-10)f R/f t 0.273 0.293 0.279 0.266
Conditional expression (4-1) is as follows to the value of (4-11).
Embodiment 1 embodiment 2 embodiment 3 embodiment 4 embodiment 5
(4-1)f 1/f t 0.649 0.649 0.649 0.646 0.647
(4-2)nd 1p 1.773 1.768 1.773 1.773 1.768
(4-3)R 1pf/f 1p 0.83 0.84 0.84 0.83 0.86
(4-4)R lnr/f ln -0.28 -0.23 -0.29 -0.28 -0.25
(4-5)|f 2/f t 0.147 0.147 0.147 0.147 0.147
(4-6)f t/f w 9.664 9.648 9.661 9.675 9.564
(4-7)I mw/f w 0.762 0.762 0.763 0.764 0.758
(4-8) L t/ I Mw(in air)
13.412 13.384 13.448 13.335 13.338
(4-9)|Δc 07-Δf 07|/p
4.35 4.95 4.40 4.30 4.20
(4-10)|Δg 10|/p 3.90 5.85 3.85 4.15 6.50
(4-11)|Δg 10-Δg 07|/p
3.65 4.30 3.65 3.65 4.55
Embodiment 6 embodiment 7 embodiment 8 embodiment 9
(4-1)f 1/f t 0.671 0.648 0.648 0.661
(4-2)nd 1p 1.773 1.773 1.747 1.768
(4-3)R 1pf/f 1p 0.85 0.85 0.78 0.86
(4-4)R lnr/f ln -0.30 -0.29 -0.25 -0.25
(4-5)|f 2/f t| 0.152 0.147 0.113 0.147
(4-6)f t/f w 9.596 9.606 9.540 9.596
(4-7)I mw/f w 0.758 0.760 0.785 0.759
(4-8) L t/ I Mw(in air) 13.363 13.214 12.134 13.381
(4-9)|Δc 07-Δf 07|/p 4.35 3.80 3.20 4.50
(4-10)|Δg 10|/p 4.75 5.55 6.35 5.35
(4-11)|Δg 10-Δg 07|/p 4.50 4.50 2.80 3.65
Embodiment 16 embodiment 17 embodiment 18 embodiment 19 embodiment 20
(4-1)f 1/f t 0.649 0.649 0.649 0.647 0.645
(4-2)nd 1p 1.773 1.768 1.773 1.773 1.768
(4-3)R 1pf/f 1p 0.83 0.84 0.84 0.83 0.86
(4-4)R lnr/f ln -0.28 -0.23 -0.29 -0.28 -0.25
(4-5)|f 2/f t| 0.147 0.147 0.147 0.148 0.146
(4-6)f t/f w 9.603 9.604 9.606 9.630 9.606
(4-7)I mw/f w 0.723 0.723 0.725 0.726 0.725
(4-8) L t/ I Mw(in air)
14.063 14.039 14.058 13.986 13.942
(4-9)|Δc 07-Δf 07|/p
4.35 4.95 4.40 4.30 4.20
(4-10)|Δg 10|/p 3.90 5.85 3.85 4.15 6.50
(4-11)|Δg 10-Δg 07|/p
3.65 4.30 3.65 3.65 4.55
Embodiment 21 embodiment 22 embodiment 23 embodiment 24
(4-1)f 1/f t 0.671 0.646 0.627 0.661
(4-2)nd 1p 1.773 1.773 1.747 1.768
(4-3)R 1pf/f 1p 0.85 0.85 0.78 0.86
(4-4)R lnr/f 1n -0.30 -0.29 -0.25 -0.25
(4-5)|f 2/f t| 0.152 0.146 0.110 0.147
(4-6)f t/f w 9.607 9.612 9.625 9.593
(4-7)I mw/f w 0.729 0.730 0.736 0.723
(4-8) L t/ I Mw(in air)
13.898 13.715 12.626 14.038
(4-9)|Δc 07-Δf 07|/p
4.35 3.80 3.20 4.50
(4-10)|Δg 10|/p 4.75 5.55 6.35 5.35
(4-11)|Δg 10-Δg 07|/p 4.50 4.50 2.80 3.65
(correction of distortion)
In addition, when using zoom-lens system of the present invention, carry out figure adjustment electronically to image distortion.Key concept for the figure adjustment of image distortion will be described below.
For example, as shown in Figure 46, be the center with the intersection point on optical axis and image pickup plane, will fix with the convergent-divergent on the circumference (image height degree) of the radius R that connects in the longer sides of AP pick-up plane, and make the benchmark of this circumference for proofreading and correct.Next, roughly move each point on the circumference (image height degree) of any radius r (ω) except radius R, and (ω) carry out correction so that radius becomes r ' through on concentric circles, moving by radiation direction.
For example, in Figure 46, will be positioned at any radius r of inboard of the circle of radius R 1Some P on the circumference (ω) 1Center towards circle moves to the radius r that will proofread and correct 1Some P on ' (ω) the circumference 2And, will be positioned at any radius r in the outside of the circle of radius R 2Some Q on the circumference (ω) 1Direction towards leaving from the center of circle moves to the radius r that will proofread and correct 2Some Q on ' (ω) the circumference 2
Here, r ' (ω) can be expressed as as follows.
r′(ω)＝α·f·tan ω(0≤α≤1)
Wherein, ω is that half image angle and the f of object are the focal lengths of imaging optical system (zoom-lens system among the present invention).
Here, when making the desirable image height degree corresponding be Y, so with the circle (image height degree) of radius R
α＝R/Y＝R/(f·tanω)。
It is desirable to, optical system is with respect to optical axis rotation symmetry.In other words, distortion is also by occurring with respect to the rotational symmetric mode of optical axis.Therefore; As stated; Under the situation of calibrating optical distortion electronically; On the angle of data volume and calculated amount, can think favourable when carrying out timing through following processing; Said processing comprises: the convergent-divergent on the circumference (image height degree) of the radius R that in the intersection point with optical axis on the reproduced image and image pickup plane is the longer sides of fixing and AP pick-up plane under the situation at center, connects, roughly move each point on the circumference (image height degree) of any radius r (ω) except radius R by radiation direction, and on concentric circles, move so that radius becomes r ' (ω).
In addition, optical image no longer is continuous amount (because sampling) at the time point by electronic image pickup device captured image.Therefore, as long as the pixel on the electronic image pickup device is not to arrange radially, the circle of the radius R of on optical imagery, accurately describing is accurate circle no longer just.
In other words, about the shape correction of the view data represented to each discrete coordinates point, do not exist can be fixedly scaling circle.Therefore, (Xi Yj), can use the method that confirm to move destination coordinate (Xi ', Yj ') for each pixel.(Xi when Yj) moving to coordinate (Xi ', Yj '), gets the mean value of the value of each pixel when two or more points.And when not having the point that moves, the value of coordinate that can be through using some surrounding pixels (Xi ', Yj ') is inserted in carrying out.
When in the electronic image pickup apparatus that particularly has zoom-lens system, making with respect to the distortion of optical axis very significantly owing to the foozle of optical system or electronic image pickup device etc.; And when the circle of the radius R of on optical image, describing was asymmetric, this method was effective for correction.And when in image pick-up element or various output unit, signal reproduction geometric distortion being occurred during for image, it is effective for correction.
In electronic image pickup apparatus of the present invention; For calculation correction amount r ' (ω)-r (ω), can be provided with as follows: with the relation between r (ω) (i.e. half image angle) and the image height degree, or true image height degree r and desirable image height degree r '/α between the recording medium of relation record in being built in electronic image pickup apparatus in.
For the extreme deficiency of light quantity can not appear in the two ends place of the image after the distortion correction on short side direction, the radius R expression formula that can meet the following conditions.
0≤R≤0.6Ls
Wherein, Ls is the length that AP picks up the minor face of face.
Preferably, the radius R expression formula that meets the following conditions.
0.3Ls≤R≤0.6Ls
In addition, bestly be to make the radius of the radius R and the inscribed circle of the short side direction of AP pick-up plane roughly consistent.Under near near (promptly the axle) radius R=0 fixedly scaling correction situation, some is unfavorable from the angle of substantial image quantity, even but can guarantee to add the effect that wide angle makes that also size is less.
The focal length interval that needs to proofread and correct is divided into a plurality of focus areas.And near the correcting value that available as taking the photograph in the focus area of being cut apart meets the following conditions the far-end under the situation of correcting result of expression formula is basically carried out correction:
r′(ω)＝α·f·tanω
Yet in this case, the wide-angle side in the focus area of being cut apart has to a certain degree residual in the barrel distortion of the wide-angle side of the focus area of being cut apart.And, when the quantity in the zone of being cut apart increased, the needs of the necessary particular data of correction appearred in recording medium, keeping extraly.Therefore, the quantity of increase institute cut zone is not preferred.Therefore, calculate in advance with the focus area of being cut apart in one or more coefficients of being associated of each focal length.Can be based on confirming these coefficients through simulation or through the measurement of physical device.
Can calculate the correcting value under the situation of taking the photograph near the basic correcting result that concerns below the satisfying far-end in the focus area of being cut apart:
r′(ω)＝α·f·tanω
And can make it become final correcting value through the coefficient that multiply by each focal length to this correcting value uniformly.
In addition, when not having distortion in the picture that obtains through imaging (forming picture) to the object of unlimited distance, below relation establishment:
f＝y/tanω
Here; The picture point of representing y leaves the height (image height degree) of optical axis; F representes the focal length of imaging system (zoom-lens system among the present invention), and ω representes to be connected to the angle (object half image angle) of the corresponding object point direction of the picture point of position of y with respect to optical axis with center from the image pickup plane.
When in imaging system, having barrel distortion, relation becomes
f＞y/tanω。
In other words, as focal distance f and the image height degree y of imaging system fixedly the time, it is very big that the value of ω becomes.
(digital camera)
Figure 47 to 49 is concept maps of structure of wherein above-mentioned zoom-lens system being incorporated into the digital camera of photographing optical system 141 according to of the present invention.Figure 47 is the front elevation that the outward appearance of digital camera 140 is shown, and Figure 48 is the rear view of digital camera 140, and Figure 49 is the schematic cross sectional view that the structure of digital camera 140 is shown.In Figure 47 and Figure 49, show the not folded state of photographing optical system 141.Under the situation of this embodiment; Digital camera 140 comprises: have the photographing optical system 141 of taking light path 142, the finder optical system 143 with view finder light path 144, shutter release button 145, flashlamp 146, LCD 147, focal length change button 161 and change switch 162 etc. is set; And; Under the not folded state of photographing optical system 141; Through slip cover 160, cover photographing optical system 141, finder optical system 143 and flashlamp 146 by lid 160.In addition; When lid 160 is opened and be arranged at digital camera in the state of taking pictures; The not folded state that photographing optical system 141 adopts as shown in Figure 47; When pressing the shutter release button 145 on the top that is arranged in digital camera 140, with pressing synchronously of shutter release button 145, photographing optical system 141 (the for example zoom-lens system in first embodiment) is taken pictures.The object picture that photographing optical system 141 forms limits optical low-pass filter and the cover plate C of coating and is formed on the image pickup surface of CCD 149 via using wavelength region may it on.Through treating apparatus 151, will be presented on the LCD 147 as electronic image as the object picture of light-receiving by CCD 149, this LCD 147 is arranged on the back side of digital camera 140.And pen recorder 152 is connected to treating apparatus 151, and it also can write down captured electronic image.Pen recorder 152 can be provided with treating apparatus 151 discretely, perhaps can write down and forms pen recorder 152 through writing floppy disk, storage card or MO etc. electronically.And, can video camera be formed and wherein be furnished with the silver salt video camera that silver salt film comes replaced C CD 149.
In addition, view finder objective lens optical system 153 is arranged on the view finder light path 144.View finder objective lens optical system 153 is made up of a plurality of lens units (being three unit among this figure) and two prisms, and is processed by the varifocal optical system that the zoom-lens system of its mid-focal length and photographing optical system 141 synchronously changes.The object that is formed by view finder objective lens optical system 153 looks like to be formed on the field frame 157 as the erecting prism 155 of erect image element.At the dorsal part of erecting prism 155, be furnished with the eyepiece optical system 159 that erect image is directed to beholder's eyeball.Exiting side at eyepiece optical system 159 is furnished with cap member 150.
Because the digital camera 140 that constitutes by this way has according to photographing optical system 141 of the present invention; Under folded state, has minimum thickness; And be placed on the imaging performance that has stabilizer pole in the whole zoom area, so can realize high-performance, small size and wide visual field angle by high-shrinkage.
(internal circuit configuration)
Figure 50 is the structured flowchart of internal circuit of the critical piece of digital camera 140.In the following description, above-mentioned treating apparatus 151 for example comprises CDS/ADC portion 124, temporary storage 117 and image processing part 118, and memory storage 152 for example is made up of storage medium portion 119.
As shown in Figure 50, digital camera 140 comprises operating portion 112, is connected to the control part 113 of operating portion 112, the temporary storage 117 and the image that are connected to the control signal output ends mouth of control part 113 via bus 114 and bus 115 form driving circuit 116, image processing part 118, storage medium portion 119, display part 120 and information storage part 121 is set.
Temporary storage 117, image processing part 118, storage medium portion 119, display part 120 and be provided with that information storage part 121 is constructed to can be via bus 122 mutual input and output data.And CCD 149 is connected to image with CDS/ADC portion 124 and forms driving circuit 116.
Operating portion 112 comprises various load buttons and switch, and is from outside (by the user of the digital camera) circuit via the event information of these load buttons and switch input to the control part notice.
Control part 113 is CPU (CPU), and has not shown built-in computer program memory.Control part 113 is computer programs of storing according in this computer program memory, when receiving the video camera user via the instruction of operating portion 112 input and order, controls the circuit of whole digital camera 140.
CCD 149 receives the object picture via photographing optical system 141 formation according to the present invention as light.CCD 149 is following image pick-up element: it forms driving circuit 116 drivings and control by image, and will convert electric signal into and output to CDS/ADC portion 124 to the amount of the light of each pixel of object picture.
CDS/ADC portion 124 is following circuit: it amplifies the electric signal from CCD 149 inputs; And execution analog/digital conversion; And will be only output to temporary storage 117 through the original image data (uncorrected data below is called " raw data ") of amplifying and convert numerical data into.
Temporary storage 117 is the buffers that for example comprise SDRAM (Synchronous Dynamic Random Access Memory), and is the memory storage of interim storage from the raw data of CDS/ADC portion 124 outputs.Image processing part 118 is following circuit: it reads in the temporary storage 117 raw data of storage in raw data or the storage medium portion 119 of storage; And the image quality parameter based on control part 113 appointments carries out various Flame Image Process electronically, comprises distortion correction.
Storage medium portion 119 is by the card of for example removably installing that comprises flash memory or the recording medium of bar form.Storage medium portion 119 is control circuits of device, wherein record and maintain raw data of passing on from temporary storage 117 and the view data of image processing part 118, having carried out Flame Image Process in cassette flash memory and bar type flash memory.
Display part 120 comprises LCD, and is the circuit of display image and actions menu on LCD.Information storage part 121 is set comprises ROM portion that has wherein stored various image quality parameters in advance and the RAM portion that has stored the image quality parameter of the image quality parameter that reads from ROM portion, selecting through the input operation on the operating portion 112.Information storage part 121 be set be the input that controls to storer and from the circuit of the output of storer.
The digital camera 140 of structure has according to photographing optical system 141 of the present invention by this way; This photographing optical system 141 is placed on the imaging performance that has stabilizer pole in the whole zoom area in the structure with enough wide-angle zones and miniaturization simultaneously by high-shrinkage.Therefore, can realize high-performance, small size and wide visual angle.And, can and take the photograph far-end in wide-angle side and carry out focusing operation rapidly.
Industrial applicability
As understanding from aforementioned, zoom lens according to the present invention help obtaining high zoom ratios and wide visual field angle, to satisfy the user for than the demand of a broader category of shot region (can take situation) in the past.In addition, these zoom lens are suitable for using with the electronic image pickup device such as CCD or cmos sensor, because can there not be the excellent picture quality that obtains institute's captured image difficultly.

Claims (116)

1. zoom lens, these zoom lens comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom,
Second lens unit comprises two negative lens elements and a positive element, and in second lens unit is negative lens element near the lens element of thing side, and
The said zoom lens expression formula that meets the following conditions:
0.60＜∑d 2G/I mw＜1.95 ...(1-1)
1.830＜N 2ave＜2.000 ...(1-2)
∑ d wherein 2GBe the thickness of second lens unit on optical axis, I MwBe the maximum image height degree of the wide-angle side of said zoom lens, and N 2aveBe all lens elements in second lens unit to the mean value of the refractive index of d line, wherein term " lens element " refers to satisfy 0.1＜L/I MwOptics, wherein L is the thickness of said optics on optical axis in second lens unit.
2. zoom lens according to claim 1, wherein, the said zoom lens expression formula that meets the following conditions:
0.02＜|f 2/f t|＜0.05 ...(1-3)
F wherein 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
3. zoom lens according to claim 1, wherein, the said zoom lens expression formula that meets the following conditions:
-0.65＜f 2/R 22f＜0.35 ...(1-4)
-0.65＜f 2/R 23r＜0.35 ...(1-5)
F wherein 2Be the focal length of second lens unit, R 22fBe the paraxial radius-of-curvature of second in second lens unit near the thing side surface of the lens element of thing side, and R 23rBe the paraxial radius-of-curvature of the 3rd in second lens unit near the picture side surface of the lens element of thing side.
4. zoom lens according to claim 1, wherein, the said zoom lens expression formula that meets the following conditions:
0.4＜SF 21＜1.5 ...(1-6)
SF wherein 21By SF 21=(R 21f+ R 21r)/(R 21f-R 21r) definition, R 21fBe in second lens unit near the paraxial radius-of-curvature of the thing side surface of the negative lens element of thing side, and R 21rBe in second lens unit near the paraxial radius-of-curvature of the picture side surface of the negative lens element of thing side.
5. zoom lens according to claim 1 wherein, use aspheric surface at least one surface of the lens element in second lens unit.
6. zoom lens according to claim 1, wherein, second lens unit is made up of three lens elements.
7. zoom lens according to claim 1, wherein, first lens unit is made up of two or still less lens element.
8. zoom lens according to claim 1, wherein, the said zoom lens expression formula that meets the following conditions:
0.2＜f 1/f t＜1.6 ...(1-7)
F wherein 1Be the focal length of first lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
9. zoom lens according to claim 1, wherein, said zoom lens from its thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index; With
The 4th lens unit with positive refractive index.
10. zoom lens according to claim 9, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves, and aperture diaphragm moves.
11. zoom lens according to claim 1, wherein, said zoom lens from its thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index;
The 4th lens unit with negative index; With
The 5th lens unit with positive refractive index.
12. zoom lens according to claim 11, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves; The 5th lens unit moves, and aperture diaphragm moves.
13. zoom lens according to claim 1, these zoom lens are made up of nine or still less lens element on the whole.
14. zoom lens according to claim 9, these zoom lens are made up of nine or still less lens element on the whole.
15. zoom lens according to claim 11, these zoom lens are made up of nine or still less lens element on the whole.
16. zoom lens according to claim 1, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ..(1-8)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and f wBe the focal length of whole zoom-lens system in wide-angle side.
17. zoom lens according to claim 9, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(1-8)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and f wBe the focal length of whole zoom-lens system in wide-angle side.
18. zoom lens according to claim 11, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(1-8)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and f wBe the focal length of whole zoom-lens system in wide-angle side.
19. zoom lens according to claim 1, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(1-9)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
20. zoom lens according to claim 9, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(1-9)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
21. zoom lens according to claim 11, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(1-9)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
22. an image pick-up device, this image pick-up device comprises:
Zoom lens as claimed in claim 1; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
23. an image pick-up device, this image pick-up device comprises:
Zoom lens as claimed in claim 9; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
24. an image pick-up device, this image pick-up device comprises:
Zoom lens as claimed in claim 11; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
25. image pick-up device according to claim 22; This image pick-up device also comprises image transitions portion, and this image transitions portion will comprise the electrical signal conversion of the distortion that is caused by said zoom lens for wherein having proofreaied and correct the picture signal of distortion through Flame Image Process.
26. image pick-up device according to claim 23; This image pick-up device also comprises image transitions portion, and this image transitions portion will comprise the electrical signal conversion of the distortion that is caused by said zoom lens for wherein having proofreaied and correct the picture signal of distortion through Flame Image Process.
27. image pick-up device according to claim 24; This image pick-up device also comprises image transitions portion, and this image transitions portion will comprise the electrical signal conversion of the distortion that is caused by said zoom lens for wherein having proofreaied and correct the picture signal of distortion through Flame Image Process.
28. zoom lens, these zoom lens comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom,
First lens unit comprises a negative lens element and at least one positive element, and
The said zoom lens expression formula that meets the following conditions:
2.00＜nd 1n＜2.30 ...(2-1)
13.0＜vd 1n＜30.0 ...(2-2)
Nd wherein 1nBe negative lens element in first lens unit to the refractive index of d line, and vd 1nIt is the Abbe number of the negative lens element in first lens unit.
29. zoom lens according to claim 28, wherein, the negative lens element in first lens unit has convex surface towards the concaveconvex shape of thing side and the expression formula that meets the following conditions:
1.0＜SF 1n＜15.0 ...(2-3)
SF wherein 1nBy SF 1n=(R 1nf+ R 1nr)/(R 1nf-R 1nr) definition, R 1nfBe the paraxial radius-of-curvature of the thing side surface of the negative lens element in second lens unit, and R 1nrIt is the paraxial radius-of-curvature of the picture side surface of the negative lens element in first lens unit.
30. zoom lens according to claim 28, wherein, the said zoom lens expression formula that meets the following conditions:
0.40＜∑d 1G/I mw＜3.00 ...(2-4)
∑ d wherein 1GBe the thickness of first lens unit on optical axis, I MwIt is the maximum image height degree of the wide-angle side of said zoom lens.
31. zoom lens according to claim 28, wherein, first lens unit is made up of a negative lens element and a positive element.
32. zoom lens according to claim 31, wherein, the said zoom lens expression formula that meets the following conditions:
0.20＜nd 1n-nd 1p＜0.55 ...(2-5)
20.0＜vd 1p-vd 1n＜55.0 ...(2-6)
Nd wherein 1nBe that negative lens element in first lens unit is to the refractive index of d line, vd 1pBe the Abbe number of the positive element in first lens unit, nd 1pBe positive element in first lens unit to the refractive index of d line, and vd 1nIt is the Abbe number of the negative lens element in first lens unit.
33. zoom lens according to claim 28, wherein, the said zoom lens expression formula that meets the following conditions:
0.2＜f 1/f t＜1.0 ...(2-7)
F wherein 1Be the focal length of first lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
34. zoom lens according to claim 28, wherein, the said zoom lens expression formula that meets the following conditions:
0.02＜|f 2/f t|＜0.50 ...(2-8)
F wherein 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
35. zoom lens according to claim 28, wherein, said zoom lens from its thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index; With
The 4th lens unit with positive refractive index.
36. zoom lens according to claim 35, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves, and aperture diaphragm moves.
37. zoom lens according to claim 28, wherein, said zoom lens from its thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index;
The 4th lens unit with negative index; With
The 5th lens unit with positive refractive index.
38. according to the described zoom lens of claim 37, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves; The 5th lens unit moves, and aperture diaphragm moves.
39. zoom lens according to claim 28, wherein, said zoom lens are made up of nine or still less lens element.
40. zoom lens according to claim 35, wherein, said zoom lens are made up of nine or still less lens element.
41. according to the described zoom lens of claim 37, wherein, said zoom lens are made up of nine or still less lens element.
42. zoom lens according to claim 28, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(2-9)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and f wBe the focal length of whole zoom-lens system in wide-angle side.
43. zoom lens according to claim 35, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(2-9)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and f wBe the focal length of whole zoom-lens system in wide-angle side.
44. according to the described zoom lens of claim 37, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(2-9)
F wherein tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and f wBe the focal length of whole zoom-lens system in wide-angle side.
45. zoom lens according to claim 28, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(2-10)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
46. zoom lens according to claim 35, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(2-10)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
47. according to the described zoom lens of claim 37, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(2-10)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
48. zoom lens according to claim 28, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜L t/I mw＜17.5 ...(2-11)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of said zoom lens.
49. zoom lens according to claim 35, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜L t/I mw＜17.5 ...(2-11)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of said zoom lens.
50. according to the described zoom lens of claim 37, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜L t/I mw＜17.5 ...(2-11)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of said zoom lens.
51. an image pick-up device, this image pick-up device comprises:
Zoom lens as claimed in claim 28; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
52. an image pick-up device, this image pick-up device comprises:
Zoom lens as claimed in claim 35; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
53. an image pick-up device, this image pick-up device comprises:
Zoom lens as claimed in claim 37; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
54. according to the described image pick-up device of claim 51; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
55. according to the described image pick-up device of claim 52; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
56. according to the described image pick-up device of claim 53; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
57. according to the described image pick-up device of claim 51; This image pick-up device also comprises image transitions portion, and this image transitions portion will represent the electrical signal conversion of the picture that is formed by said zoom lens for wherein having proofreaied and correct the picture signal of the color imbalance that is caused by the convergent-divergent chromatic aberation through Flame Image Process.
58. according to the described image pick-up device of claim 52; This image pick-up device also comprises image transitions portion, and this image transitions portion will represent the electrical signal conversion of the picture that is formed by said zoom lens for wherein having proofreaied and correct the picture signal of the color imbalance that is caused by the convergent-divergent chromatic aberation through Flame Image Process.
59. according to the described image pick-up device of claim 53; This image pick-up device also comprises image transitions portion, and this image transitions portion will represent the electrical signal conversion of the picture that is formed by said zoom lens for wherein having proofreaied and correct the picture signal of the color imbalance that is caused by the convergent-divergent chromatic aberation through Flame Image Process.
60. zoom lens, these zoom lens comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom, and
Second lens unit comprises at least one positive element of the expression formula that meets the following conditions:
-0.50＜f 2/f t＜-0.03 ...(3-1)
2.00＜nd 2p＜2.30 ...(3-2)
13.0＜vd 2p＜30.0 ...(3-3)
F wherein 2Be the focal length of second lens unit, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end, nd 2pBe positive element in second lens unit to the refractive index of d line, and vd 2pIt is the Abbe number of the positive element in second lens unit.
61. according to the described zoom lens of claim 60, wherein,
Second lens unit is made up of two or still less negative lens element and a positive element.
62. according to the described zoom lens of claim 61, wherein, second lens unit from the thing side in order by forming with lower component: first negative lens element, positive element and second negative lens element.
63. according to the described zoom lens of claim 62, wherein, the said zoom lens expression formula that meets the following conditions:
0.2＜SF 2p1＜3.50 ...(3-4)
SF wherein 2p1By SF 2p1=(R 2pf1+ R 2pr1)/(R 2pf1-R 2pr1) definition, R 2pf1Be the paraxial radius-of-curvature of the thing side surface of the positive element of between first negative lens element and second negative lens element, arranging in second lens unit, and R 2pr1It is the paraxial radius-of-curvature of the picture side surface of the positive element of between first negative lens element and second negative lens element, arranging in second lens unit.
64. according to the described zoom lens of claim 61, wherein, second lens unit from the thing side in order by forming with lower component: first negative lens element, second negative lens element and positive element.
65. according to the described zoom lens of claim 64, wherein, the said zoom lens expression formula that meets the following conditions:
-4.5＜SF 2p2＜-0.5 ...(3-5)
SF wherein 2p2By SF 2p2=(R 2pf2+ R 2pr2)/(R 2pf2-R 2pr2) definition, R 2pf2Be in second lens unit near the paraxial radius-of-curvature of the thing side surface of the positive element of picture side, and R 2pr2It is the paraxial radius-of-curvature as side surface of the positive element of the most approaching picture side in second lens unit.
66. according to the described zoom lens of claim 60, wherein, said zoom lens from the thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index; With
The 4th lens unit with positive refractive index.
67. according to the described zoom lens of claim 66, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves, and aperture diaphragm moves.
68. according to the described zoom lens of claim 60, wherein, said zoom lens from the thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index;
The 4th lens unit with negative index; With
The 5th lens unit with positive refractive index.
69. according to the described zoom lens of claim 68, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves; The 5th lens unit moves, and aperture diaphragm moves.
70. according to the described zoom lens of claim 60, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(3-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
71. according to the described zoom lens of claim 66, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(3-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
72. according to the described zoom lens of claim 68, wherein, the said zoom lens expression formula that meets the following conditions:
4.0＜f t/f w＜20.0 ...(3-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
73. according to the described zoom lens of claim 60, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(3-7)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
74. according to the described zoom lens of claim 66, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(3-7)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
75. according to the described zoom lens of claim 68, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(3-7)
I wherein MwBe the maximum image height degree of the wide-angle side of said zoom lens, and f wBe the focal length of whole zoom-lens system in wide-angle side.
76. an image pick-up device, this image pick-up device comprises:
Zoom lens as claimed in claim 60; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
77. an image pick-up device, this image pick-up device comprises:
Like the described zoom lens of claim 66; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
78. an image pick-up device, this image pick-up device comprises:
Like the described zoom lens of claim 68; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
79. according to the described image pick-up device of claim 76; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
80. according to the described image pick-up device of claim 77; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
81. according to the described image pick-up device of claim 78; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
82. zoom lens, these zoom lens comprise from its thing side in order:
First lens unit with positive refractive index;
Second lens unit with negative index; With
The 3rd lens unit with positive refractive index, wherein
Distance through changing between these lens units is carried out zoom,
First lens unit is made up of a negative lens element and a positive element, and
The said zoom lens expression formula that meets the following conditions:
0.1＜f 1/f t＜1.05 ...(4-1)
1.70＜nd 1p＜2.20 ...(4-2)
F wherein 1Be the focal length of first lens unit, f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end and nd 1pBe that positive element in first lens unit is to the refractive index of d line.
83. 2 described zoom lens according to Claim 8, wherein, first lens unit is made up of towards the positive element of thing side towards the negative lens element and the convex surface of picture side concave surface from the thing side in order, and the said zoom lens expression formula that meets the following conditions:
0.5＜R 1pf/f 1p＜10.0 ...(4-3)
-2.0＜R 1n/f 1n＜-0.10 ...(4-4)
R wherein 1pfBe the paraxial radius-of-curvature of the thing side surface of the positive element in first lens unit, and f 1pBe the focal length of the positive element in first lens unit, R 1nrBe the paraxial radius-of-curvature of the picture side surface of the negative lens element in first lens unit, and f 1nIt is the focal length of the negative lens element in first lens unit.
84. 2 described zoom lens according to Claim 8, wherein, negative lens element in first lens unit and positive element constitute and engage lens.
85. 2 described zoom lens according to Claim 8, wherein, negative lens element in first lens unit and positive element are mutual asynthetic separate lenses elements.
86. 2 described zoom lens according to Claim 8, wherein, said zoom lens from the thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index; With
The 4th lens unit with positive refractive index.
87. 6 described zoom lens according to Claim 8, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves; The 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves, and aperture diaphragm moves.
88. 2 described zoom lens according to Claim 8, wherein, said zoom lens from the thing side in order by forming with lower component:
First lens unit with positive refractive index;
Second lens unit with negative index;
The 3rd lens unit with positive refractive index;
The 4th lens unit with negative index; With
The 5th lens unit with positive refractive index.
89. 8 described zoom lens according to Claim 8, wherein, said zoom lens comprise aperture diaphragm, and
During from wide-angle side to the zoom of taking the photograph far-end; First lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it; Second lens unit moves, and the 3rd lens unit more moves near the mode of thing side than in wide-angle side taking the photograph far-end by it, and the 4th lens unit moves; The 5th lens unit moves, and aperture diaphragm moves.
90. 2 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
0.02＜|f 2/f t|＜0.50 ...(4-5)
F wherein 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
91. 6 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
0.02＜|f 2/f t|＜0.50 ...(4-5)
F wherein 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
92. 8 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
0.02＜|f 2/f t＜0.50 ...(4-5)
F wherein 2Be the focal length of second lens unit, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
93. 2 described zoom lens according to Claim 8, wherein,
Said zoom lens are made up of nine or still less lens element.
94. 6 described zoom lens according to Claim 8, wherein,
Said zoom lens are made up of nine or still less lens element.
95. 8 described zoom lens according to Claim 8, wherein,
Said zoom lens are made up of nine or still less lens element.
96. 2 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜f t/f w＜30.0 ...(4-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
97. 6 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜f t/f w＜30.0 ...(4-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
98. 8 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜f t/f w＜30.0 ...(4-6)
F wherein wBe the focal length of whole zoom-lens system in wide-angle side, and f tBe that whole zoom-lens system is being taken the photograph the focal length of far-end.
99. 2 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(4-7)
I wherein MwBe the maximum image height degree of the wide-angle side of zoom lens, and f wBe the focal lengths of zoom lens in wide-angle side.
100. 6 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(4-7)
I wherein MwBe the maximum image height degree of the wide-angle side of zoom lens, and f wBe the focal lengths of zoom lens in wide-angle side.
101. 8 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
0.50＜I mw/f w＜1.00 ...(4-7)
I wherein MwBe the maximum image height degree of the wide-angle side of zoom lens, and f wBe the focal lengths of zoom lens in wide-angle side.
102. 2 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜L t/I mw＜22.5 ...(4-8)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of zoom lens.
103. 6 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜L t/I mw＜22.5 ...(4-8)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of zoom lens.
104. 8 described zoom lens according to Claim 8, wherein, the said zoom lens expression formula that meets the following conditions:
5.0＜L t/I mw＜22.5 ...(4-8)
L wherein tBe that whole zoom-lens system is being taken the photograph the whole length of far-end and I MwIt is the maximum image height degree of the wide-angle side of zoom lens.
105. an image pick-up device, this image pick-up device comprises:
Like the described zoom lens of claim 82; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
106. an image pick-up device, this image pick-up device comprises:
Like the described zoom lens of claim 86; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
107. an image pick-up device, this image pick-up device comprises:
Like the described zoom lens of claim 88; With
Image pick-up element, it converts the picture that said zoom lens form into electric signal.
108. according to the described image pick-up device of claim 105; This image pick-up device also comprises image transitions portion, and this image transitions portion will represent the electrical signal conversion of the picture that is formed by said zoom lens for wherein having proofreaied and correct the picture signal of the color imbalance that is caused by the convergent-divergent chromatic aberation through Flame Image Process.
109. according to the described image pick-up device of claim 106; This image pick-up device also comprises image transitions portion, and this image transitions portion will represent the electrical signal conversion of the picture that is formed by said zoom lens for wherein having proofreaied and correct the picture signal of the color imbalance that is caused by the convergent-divergent chromatic aberation through Flame Image Process.
110. according to the described image pick-up device of claim 107; This image pick-up device also comprises image transitions portion, and this image transitions portion will represent the electrical signal conversion of the picture that is formed by said zoom lens for wherein having proofreaied and correct the picture signal of the color imbalance that is caused by the convergent-divergent chromatic aberation through Flame Image Process.
111. according to the described image pick-up device of claim 108, wherein, this image pick-up device expression formula that in whole zooming range, meets the following conditions:
2.0＜|Δc 07-Δf 07|/p＜15.0 ...(4-9)
2.0＜|Δg 10|/p＜15.0 ...(4-10)
|Δg 10-Δg 07|/p＜12.0 ...(4-11)
Δ c wherein 07, Δ f 07, and Δ g 07Be respectively at 70% the image height degree c of place line, f line and the g line that equal maximum diagonal angle image height degree amount, Δ g with respect to the convergent-divergent chromatic aberation of d line 10Be that the image height degree g of place line is with respect to the amount of the convergent-divergent chromatic aberation of d line at maximum diagonal angle, and p is the pel spacing of image pick-up element.
112. according to the described image pick-up device of claim 109, wherein, this image pick-up device expression formula that in whole zooming range, meets the following conditions:
2.0＜|Δc 07-Δf 07|/p＜15.0 ...(4-9)
2.0＜|Δg 10|/p＜15.0 ...(4-10)
|Δg 10-Δg 07|/p＜12.0 ...(4-11)
Δ c wherein 07, Δ f 07, and Δ g 07Be respectively at 70% the image height degree c of place line, f line and the g line that equal maximum diagonal angle image height degree amount, Δ g with respect to the convergent-divergent chromatic aberation of d line 10Be that the image height degree g of place line is with respect to the amount of the convergent-divergent chromatic aberation of d line at maximum diagonal angle, and p is the pel spacing of image pick-up element.
113. according to the described image pick-up device of claim 110, wherein, this image pick-up device expression formula that in whole zooming range, meets the following conditions:
2.0＜|Δc 07-Δf 07|/p＜15.0 ...(4-9)
2.0＜|Δg 10|/p＜15.0 ...(4-10)
|Δg 10-Δg 07|/p＜12.0 ...(4-11)
Δ c wherein 07, Δ f 07, and Δ g 07Be respectively at 70% the image height degree c of place line, f line and the g line that equal maximum diagonal angle image height degree amount, Δ g with respect to the convergent-divergent chromatic aberation of d line 10Be that the image height degree g of place line is with respect to the amount of the convergent-divergent chromatic aberation of d line at maximum diagonal angle, and p is the pel spacing of image pick-up element.
114. according to the described image pick-up device of claim 105; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
115. according to the described image pick-up device of claim 106; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
116. according to the described image pick-up device of claim 107; This image pick-up device also comprises image transitions portion, and the electrical signal conversion that this image transitions portion comprises representative through Flame Image Process the picture of the distortion that is caused by said zoom lens is the picture signal of wherein having proofreaied and correct distortion.
CN2009100023534A 2008-01-08 2009-01-07 Zoom lens and image pickup apparatus equipped with same Expired - Fee Related CN101493571B (en)

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JP2008001661A JP2009163068A (en) 2008-01-08 2008-01-08 Zoom lens and imaging apparatus using the same
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JP2008-001640 2008-01-08
JP2008001640A JP5075644B2 (en) 2008-01-08 2008-01-08 Zoom lens and image pickup apparatus using the same
JP2008001649A JP5075645B2 (en) 2008-01-08 2008-01-08 Zoom lens and image pickup apparatus using the same
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