CN105866933A - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN105866933A CN105866933A CN201510034753.9A CN201510034753A CN105866933A CN 105866933 A CN105866933 A CN 105866933A CN 201510034753 A CN201510034753 A CN 201510034753A CN 105866933 A CN105866933 A CN 105866933A
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- imaging lens
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Abstract
The invention provides an imaging lens. The imaging lens includes a first lens with positive focal power, a diaphragm, a second lens with negative focal power, a third lens with positive focal power or negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and an image sensing device which are sequentially distributed from an object side to an image side; and the imaging lens meets the conditional expression that 0.1<(0.5*p/D)<1.5, wherein D is the diameter of the diaphragm, and p the pixel size of the image sensing device.
Description
Technical field
The present invention relates to imaging technique, particularly to a kind of imaging lens.
Background technology
Along with gradually popularizing of numerical monitor, imaging lens is had higher requirement by instant video device.Such as, high zoom multiplying power, miniaturization and high imaging quality are the major trends of current varifocal imaging camera lens development.Therefore, under relatively low illumination, still ensure that high imaging quality is the major subjects of current varifocal imaging lens design.
Summary of the invention
In view of this, it is necessary to a kind of speaker that can solve problem above is provided.
In view of this, it is necessary to the imaging lens still ensuring that high imaging quality under a kind of relatively low illumination is provided.
A kind of imaging lens, it includes the first eyeglass of the positive light coke having, aperture the most successively, has the second eyeglass of negative power, has positive light coke or the 3rd eyeglass of negative power, has the 4th eyeglass of positive light coke, has the 5th eyeglass and CIS of negative power；Described imaging lens satisfies the following conditional expression: 0.1
< (0.5 * p/D) < 1.5, wherein, D is the diameter of described aperture, and p is the Pixel Dimensions of described CIS.
A kind of imaging lens, it includes aperture, first eyeglass with positive light coke the most successively, has the second eyeglass of negative power, has positive light coke or the 3rd eyeglass of negative power, has the 4th eyeglass of positive light coke, has the 5th eyeglass and CIS of negative power；Described imaging lens satisfies the following conditional expression: 0.1
< (0.5 * p/D) < 1.5, wherein, D is the diameter of described aperture, and p is the Pixel Dimensions of described CIS.
Compared with prior art, conditional 0.1 < (0.5 * p/D) < 1.5 is by optimizing the relation between diameter and the Pixel Dimensions of CIS of aperture scale, being adjusted into the light of aperture and can make object in the case of low-light (level) (Low Luminosity), described imaging lens still can meet image quality.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the imaging lens of first embodiment of the invention.
Fig. 2 is the spherical aberration performance diagram of the imaging lens of Fig. 1.
Fig. 3 is the curvature of field performance diagram of the imaging lens of Fig. 1.
Fig. 4 is distortion (distortion) performance diagram of the imaging lens of Fig. 1.
Fig. 5 is the schematic diagram of the imaging lens of second embodiment of the invention.
Fig. 6 is the spherical aberration performance diagram of the imaging lens of Fig. 5.
Fig. 7 is the curvature of field performance diagram of the imaging lens of Fig. 5.
Fig. 8 is the distortion performance curve chart of the imaging lens of Fig. 5.
Fig. 9 is the schematic diagram of the imaging lens of third embodiment of the invention.
Figure 10 is the spherical aberration performance diagram of the imaging lens of Fig. 9.
Figure 11 is the curvature of field performance diagram of the imaging lens of Fig. 9.
Figure 12 is distortion (distortion) performance diagram of the imaging lens of Fig. 9.
Main element symbol description
| Imaging lens | 100,200,300 |
| Aperture | 20,201,301 |
| First eyeglass | 10 |
| Second eyeglass | 30 |
| 3rd eyeglass | 40 |
| 4th eyeglass | 50 |
| 5th eyeglass | 60 |
| CIS | 80 |
| Infrared fileter | 70 |
| Surface | S1, S3, S5, S7, S9S2, S4, S6, S8, S10 |
Following detailed description of the invention will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Detailed description of the invention
The speaker provided the technical program below in conjunction with drawings and Examples is described in further detail.
Refer to the imaging lens 100 that Fig. 1, Fig. 1 provide for first embodiment of the invention.30, one, the second eyeglass that described imaging lens 100 includes the most successively, 20, one, 10, aperture of the first eyeglass with positive light coke has negative power has 40, one, the 3rd eyeglass of positive light coke or negative power and has 50, the 5th eyeglass 60, optical filter 70 and CIS 80 with negative power of the 4th eyeglass of positive light coke.
Described first eyeglass 10 includes first surface S1 and the second surface S2 towards image side towards thing side, and described aperture 20 is arranged at the 3rd S3 position, surface, and described aperture 20 is for controlling the luminous flux by the second eyeglass 30.Described optical filter 70 is for filtering the Infrared in the light of the 5th eyeglass 60, it is to avoid when normal photographing, infrared ray is incident to CIS 80, interferes thus produces noise, may be used to protect the image sensor surface of CIS 80 simultaneously.
Described second eyeglass 30 includes the 3rd surface S3 towards thing side and the 4th surface S4 towards image side；Described 3rd eyeglass 40 includes the 5th surface S5 towards thing side and the 6th surface S6 towards image side；Described 4th eyeglass 50 includes the 7th surface S7 towards thing side and the 8th surface S8 towards image side；Described 5th eyeglass 60 includes the 9th surface S9 towards thing side and the tenth surface S10 towards image side.
First surface S1 protrudes to thing side, and second surface S2 protrudes to thing side.3rd surface S3 protrudes to thing side, and the 7th surface S7 is to thing side convex.9th surface S9 caves in image side.
Described first surface S1, second surface S2, the 3rd surface S3, the 4th surface S4, the 5th surface S5, the 6th surface S6, the 7th surface S7, the 8th surface S8, the 9th surface S9 and the tenth surface S10 are sphere or aspheric surface, in the present embodiment, described first surface S1, second surface S2, the 3rd surface S3, the 4th surface S4, the 5th surface S5, the 6th surface S6, the 7th surface S7, the 8th surface S8, the 9th surface S9 and the tenth surface S10 are sphere, and meet aspheric type formula:
(a)
。
Wherein, z is to make with reference to the shift value away from optical axis with surface vertices along optical axis direction in the position that height is h, and c is radius of curvature, and h is lens height, K be circular cone fixed number (Coin Constant), Ai be asphericity coefficient (the i-th order Aspherical of i time
Coefficient).Represent AihiCumulative, i is natural number.By the data of table 1, table 2, (referring to hereafter) are substituted into above-mentioned expression formula, the aspherical shape of each lens surface in the imaging lens 100 of first embodiment of the invention can be obtained.In table 1, L1, L2, L3, L4, L5 represent the first eyeglass the 10, second eyeglass the 30, the 3rd eyeglass the 40, the 4th eyeglass 50 and the 5th eyeglass 60 respectively；Thickness with the first eyeglass 10 that L1 refers to the thickness value of a line, thickness with the second eyeglass 30 that L2 refers to the thickness value of a line, thickness with the 3rd eyeglass 40 that L3 refers to the thickness value of a line, with the thickness of the 4th eyeglass 50 that L4 refers to the thickness value of a line, with the thickness of the 5th eyeglass 60 that L5 refers to the thickness value of a line；Represent with the one-tenth-value thickness 1/10 of a line with airspace is the spacing distance of adjacent two optical elements (between eyeglass and aperture 20, between eyeglass and eyeglass or between optical filter and CIS).Such as in table 1, thickness 0.77mm refers to the distance between the central point between the central point of second surface and aperture, distance between the center on centre distance the 3rd surface that thickness-0.36mm refers to aperture, then the thickness of the airspace between the first eyeglass 10 and the second eyeglass 30 is 0.77+(-0.36)=0.41mm；In table 1,0.13mm refers to the thickness of the airspace between the 4th surface and the 5th surface；0.85mm refers to the thickness of the airspace between the 6th surface and the 7th surface, the like.(table 3 of the second embodiment, the data of the table 5 of the 3rd embodiment also can be joined table 1 and be explained).
Table 1
Table 2
During described imaging lens 100 imaging, light, from thing side incidence imaging lens 100, converges (imaging) in CIS 80 through the first eyeglass 10, aperture the 20, second eyeglass the 30, the 3rd eyeglass the 40, the 4th eyeglass the 50, the 5th eyeglass 60 successively after optical filter 70.
For still there being the demand of preferable image quality when low-light (level), the present invention is by optimizing the Pixel Dimensions (pixel of described CIS 80
Size) relation and between described aperture 20 diameter, makes imaging lens 100 meet conditional:
(1) 0.1
< ( 0.5 * p / D) < 1.5；
Wherein, D is the diameter of described aperture 20, and p is the Pixel Dimensions of described CIS 80, and Pixel Dimensions p refers to the size of each photosensitive unit on image sensor 80, and Pixel Dimensions p determines the photon numbers that CIS 80 is able to receive that.Under normal conditions, the diameter D of aperture 20 is the biggest, and the most by the light of aperture 20 in the unit interval (time of a shutter), the light entering CIS device 80 is the most, and the picture quality that imaging lens 100 is shot is the best.And the environment of low-light (level) to represent the light energy that unit interval CIS 80 can receive relatively low, when light energy deficiency, when Pixel Dimensions is improper, the quality of the image that imaging lens 100 is shot will be poor.Therefore, here, by the relation between the Pixel Dimensions p and the diameter D of aperture 20 of optimization CIS, make imaging lens 100 when low-light (level), still can guarantee that image quality.
In the present embodiment, described imaging lens 100 is the most satisfied:
(2) 0.02
< (t2/f ) < 0.3；
Wherein, t2Being the center thickness of the second eyeglass 30, f is focal length (the effective focal of this imaging lens 100
length)；Formula (2), by optimizing the relation between thickness and the focal distance f of imaging system 100 of the second eyeglass 30, can effectively reduce the integral thickness of imaging lens.
(3) 0.8 < Vd1/Vd2
< 3；
Wherein, Vd1It is the Abbe number (Abbe Number) of the first eyeglass 10, Vd2Being the Abbe number of the second eyeglass 30, formula (3) is for eliminating the spherochromatism of imaging lens 100.
(4) 0.2 <
R1/f< 0.9；
Wherein, R1 is the radius of curvature of first surface S1, and f is the focal length of imaging lens 100.Formula (4) optimizes the relation between the radius of curvature of first surface S1 and the focal length of imaging lens 100, thus for revising the spherical aberration of imaging lens 100, coma.
(5) 1.5 < f3/f
< 5；F3 eyeglass is the focal length of the 3rd eyeglass 40.
Formula (5) ensure that the focal power of the 3rd eyeglass 40 ratio in optical system, it is possible to decrease the spherical aberration of imaging lens 100.
Refer to Fig. 2-4, shown in Fig. 2-4, be respectively the spherical aberration characteristic curve of imaging lens 100 of the first embodiment, curvature of field characteristic curve and distortion figure line.
As shown in Figure 2, curve g, F, e, d and C is respectively g light (wavelength is 435.8 nanometers, lower same), F light (wavelength is 486.1 nanometers, lower same), (wavelength is 546.1 nanometers to e light, lower with), the spherical aberration characteristic curve (lower with) that produces of d light (wavelength is 588 nanometers) and C light (wavelength is 656.3 nanometers, lower with) imaged camera lens 100.Visible, the spherical aberration that visible ray (400-700 nanometer) is produced by the imaging lens 100 of the first embodiment is controlled between-0.08mm ~ 0.08mm.
Fig. 3 is curvature of field performance diagram.Wherein, curve T and S is respectively meridianal curvature of field (tangential
Field curvature) characteristic curve and Sagittal field curvature (sagittal field curvature) characteristic curve.In the range of the meridianal curvature of field value of this imaging lens 100 and Sagittal field curvature value are controlled in-0.10mm ~ 0.10mm as seen from Figure 3.Curve shown in Fig. 4 is the distortion performance curve of imaging lens 100, it is seen then that amount of distortion is controlled between-3% ~ 3%.
Referring to Fig. 5, the imaging lens 200 that the second embodiment provides is essentially identical with the imaging lens 100 that first embodiment provides, and its difference is: described aperture 201 is arranged at second surface S2, and the 8th surface S8 protrudes to image side.By the data of table 3, table 4 is substituted into above-mentioned expression formula (a), would know that the aspherical shape of each lens surface in the imaging lens 200 of second embodiment of the invention.
Table 3
Table 4
Imaging lens 200 also meets following formula (1)-(5):
(1) 0.1
< ( 0.5 * p / D) < 1.5；
(2) 0.02
< (t2/f ) < 0.3；
(3) 0.8
< Vd1/Vd2< 3；
(4) 0.2
< R1/f< 0.9；
(5) 1.5
< f3/f < 5。
Wherein, D is the diameter of described aperture 20, and p is the Pixel Dimensions of described CIS 70；Wherein t2Being the center thickness of the second eyeglass 30, f is the focal length of this imaging lens 100；Wherein Vd1It is the Abbe number of the first eyeglass 10, Vd2It it is the Abbe number of the second eyeglass 30；Wherein R1 is the radius of curvature of first surface S1, and f is the focal length of imaging lens 100, and f3 eyeglass is the focal length of the 3rd eyeglass 40.
The spherical aberration characteristic curve of imaging lens 200 of the second embodiment, curvature of field characteristic curve and distortion figure line it is respectively shown in Fig. 6-8.
As shown in Figure 6, the spherical aberration value that as can be seen from the figure visible ray (wave-length coverage is between 400 nm-700 nm) is produced by the imaging lens 200 of the second embodiment controls in the range of-0.05mm ~ 0.05mm.
Curve T and S is respectively meridianal curvature of field (tangential field curvature) characteristic curve and Sagittal field curvature (sagittal field curvature) characteristic curve.In the range of the meridianal curvature of field value of this imaging lens 200 and Sagittal field curvature value are controlled in-0.10mm ~ 0.10mm as seen from Figure 7.In Fig. 7, curve g, F, e, d and C is respectively g light (wavelength is 435.8 nanometers, lower same), F light (wavelength is 486.1 nanometers, lower same), (wavelength is 546.1 nanometers to e light, lower with), the spherical aberration characteristic curve (lower with) that produces of d light (wavelength is 588 nanometers) and C light (wavelength is 656.3 nanometers, lower with) imaged camera lens 200.Visible, the spherical aberration that visible ray (400-700 nanometer) is produced by the imaging lens 200 of the second embodiment is controlled between-0.06mm ~ 0.06mm.
Further, the curve shown in Fig. 8 is distortion (Distortion) characteristic curve of imaging lens 200, it is seen then that the amount of distortion of above-mentioned 5 kinds of light is controlled between-3% ~ 3%.
Referring to Fig. 9, the imaging lens 300 that the 3rd embodiment provides includes aperture 301 the most successively, the first eyeglass 10 of the positive light coke that has, have the second eyeglass 30 of negative power, have positive light coke or the 3rd eyeglass 40 of negative power, have the 4th eyeglass 50 of positive light coke, the 5th eyeglass 60 with negative power and CIS 70.
By the data information of table 5, table 6 is substituted into above-mentioned expression formula (a), would know that the aspherical shape of each lens surface in the imaging lens 300 of third embodiment of the invention.Imaging lens 300 also meets:
(1) 0.1
< ( 0.5 * p / D) < 1.5；
(2) 0.02
< (t2/f ) < 0.3；
(3) 0.8
< Vd1/Vd2< 3；
(4) 0.2
< R1/f< 0.9；
(5) 1.5
< f3/f < 5。
Wherein, D is the diameter of described aperture 20, and p is the Pixel Dimensions of described CIS 70；Wherein t2Being the center thickness of the second eyeglass 30, f is the focal length of this imaging lens 100；Wherein Vd1It is the Abbe number of the first eyeglass 10, Vd2It it is the Abbe number of the second eyeglass 30；Wherein R1 is the radius of curvature of first surface S1, and f is the focal length of imaging lens 100, and f3 eyeglass is the focal length of the 3rd eyeglass 40.
Table 5
Table 6
The spherical aberration characteristic curve of imaging lens 300 of the 3rd embodiment, curvature of field characteristic curve and distortion figure line it is respectively shown in Figure 10-12.
As shown in Figure 10, the spherical aberration value that as can be seen from the figure visible ray (wave-length coverage is between 400 nm-700 nm) is produced by the imaging lens 300 of the 3rd embodiment controls in the range of-0.05mm ~ 0.05mm.
Curve T and S is respectively meridianal curvature of field (tangential field curvature) characteristic curve and Sagittal field curvature (sagittal field curvature) characteristic curve.In the range of the meridianal curvature of field value of this imaging lens 100 and Sagittal field curvature value are controlled in-0.10mm ~ 0.10mm as seen from Figure 11.In Figure 11, curve g, F, e, d and C is respectively g light (wavelength is 435.8 nanometers, lower same), F light (wavelength is 486.1 nanometers, lower same), (wavelength is 546.1 nanometers to e light, lower with), the spherical aberration characteristic curve (lower with) that produces of d light (wavelength is 588 nanometers) and C light (wavelength is 656.3 nanometers, lower with) imaged camera lens 300.Visible, the spherical aberration that visible ray (400-700 nanometer) is produced by the imaging lens 300 of the 3rd embodiment is controlled between-0.08mm ~ 0.08mm.
Further, the curve shown in Figure 12 is distortion (Distortion) characteristic curve of imaging lens 300, it is seen then that the amount of distortion of above-mentioned 5 kinds of light is controlled between-3% ~ 3%.
In sum, conditional 0.1 < (0.5 * p/D) < 1.5 is by optimizing the relation between diameter and the Pixel Dimensions of CIS of aperture scale, being adjusted into the light of aperture and can make object in the case of low-light (level) (Low Luminosity), described imaging lens still can meet image quality.
Iting is noted that above-mentioned embodiment is only the better embodiment of the present invention, those skilled in the art also can do other change in spirit of the present invention.These changes done according to present invention spirit, within all should being included in scope of the present invention.
Claims (10)
1. an imaging lens, it includes the first eyeglass of the positive light coke having, aperture the most successively, has the second eyeglass of negative power, has positive light coke or the 3rd eyeglass of negative power, has the 4th eyeglass of positive light coke, has the 5th eyeglass and CIS of negative power；Described imaging lens satisfies the following conditional expression:
0.1 < (
0.5 * p/D) < 1.5,
Wherein, D is the diameter of described aperture, and p is the Pixel Dimensions of described CIS.
2. imaging lens as claimed in claim 1, it is characterised in that described first eyeglass includes the first surface towards thing side and the second surface towards image side, and described first surface is convex surface, and described aperture is arranged on this second surface.
3. imaging lens as claimed in claim 1, it is characterised in that described second eyeglass includes the 3rd surface towards thing side and the 4th surface towards image side, and described aperture is arranged on the 3rd surface.
4. the imaging lens as described in claim 2 or 3, it is characterised in that this imaging lens also meets conditional:
0.02 < (t2/f
) < 0.3,
Wherein, t2Being the center thickness of the second eyeglass, f is the focal length of described imaging lens.
5. imaging lens as claimed in claim 4, it is characterised in that
Described imaging lens is the most satisfied: 0.8 < Vd1/Vd2 < 3,
Wherein, Vd1 is the Abbe number of described first eyeglass, and Vd2 is the Abbe number of described second eyeglass.
6. imaging lens as claimed in claim 5, it is characterised in that
Described imaging lens is the most satisfied: 0.2 < R1/f<
0.9, wherein, R1 is the radius of curvature of first surface, and f is the focal length of described imaging lens.
7. imaging lens as claimed in claim 6, it is characterised in that
Described imaging lens meets: 1.5 < f3/f
< 5,
Wherein f3It it is the focal length of the 3rd eyeglass.
8. an imaging lens, it includes aperture, first eyeglass with positive light coke the most successively, has the second eyeglass of negative power, has positive light coke or the 3rd eyeglass of negative power, has the 4th eyeglass of positive light coke, has the 5th eyeglass and CIS of negative power；Described imaging lens satisfies the following conditional expression:
0.1 < (
0.5 * p/D) < 1.5,
Wherein, D is the diameter of described aperture, and p is the Pixel Dimensions of described CIS.
9. imaging lens as claimed in claim 8, it is characterised in that this imaging lens also meets conditional:
0.02 < (t2/f
) < 0.3,
0.8 <
Vd1/Vd2 < 3,
Wherein, wherein, t2Being the center thickness of the second eyeglass, f is the focal length of described imaging lens；Vd1For the Abbe number of described first eyeglass, Vd2Abbe number for described second eyeglass.
10. imaging lens as claimed in claim 9, it is characterised in that described imaging lens is the most satisfied:
0.2 < R1/f<
0.9, with
1.5 <
F3/f < 5,
Wherein, R1 is the radius of curvature of first surface, f3It it is the focal length of the 3rd eyeglass.
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|---|---|---|---|
| CN201510034753.9A CN105866933A (en) | 2015-01-24 | 2015-01-24 | Imaging lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510034753.9A CN105866933A (en) | 2015-01-24 | 2015-01-24 | Imaging lens |
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|---|---|
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Family
ID=56624162
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110412736A (en) * | 2019-06-30 | 2019-11-05 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
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Effective date of registration: 20181207 Address after: 048026 No. 1216 Lanhua Road, Jincheng Economic Development Zone, Shanxi Province Applicant after: Sanyingchao Precision Photoelectric (Jincheng) Co., Ltd. Address before: 518109, No. two, No. tenth, East Ring Road, Pinus tabulaeformis Industrial Zone, Longhua Town, Baoan District, Guangdong, Shenzhen, 2 Applicant before: Hongfujin Precise Industry (Shenzhen) Co., Ltd. Applicant before: Hon Hai Precision Industry Co., Ltd. |
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Application publication date: 20160817 |