CN111025542B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025542B CN111025542B CN201911334970.4A CN201911334970A CN111025542B CN 111025542 B CN111025542 B CN 111025542B CN 201911334970 A CN201911334970 A CN 201911334970A CN 111025542 B CN111025542 B CN 111025542B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power; and satisfies the following relationships: f1/f is more than or equal to 0.70 and less than or equal to 0.95; BF/TTL is more than or equal to 0.35 and less than or equal to 0.55. The imaging optical lens of the present invention has good optical properties such as a large aperture, a long focal length, and an ultra-thin profile.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
Background
In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-oxide semiconductor (CMOS) Device, and due to the refinement of semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed with a good function, a light weight, a small size, and a light weight, and thus, the miniaturized camera lenses with good imaging quality are the mainstream in the current market. In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, five-piece, six-piece and seven-piece lens structures gradually appear in the design of the lens. There is a strong demand for a long-focus imaging lens having excellent optical characteristics, being ultra-thin, and sufficiently correcting chromatic aberration.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of a large aperture, ultra-thin, and long focal length while achieving high imaging performance.
To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;
the focal length of the image pickup optical lens is f, the total optical length of the image pickup optical lens is TTL, the focal length of the first lens is f1, the on-axis distance from the image side surface of the sixth lens to the image surface is BF, and the following relational expression is satisfied:
0.70≤f1/f≤0.95；
0.35≤BF/TTL≤0.55。
preferably, the radius of curvature of the object-side surface of the fourth lens element is R7, and the radius of curvature of the image-side surface of the fourth lens element is R8, which satisfy the following relationships:
-10.00≤(R7+R8)/(R7-R8)≤-1.50。
preferably, the focal length of the sixth lens is f6, and the following relation is satisfied:
-0.80≤f6/f≤-0.50
preferably, the focal length of the first lens is f1, the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, the on-axis thickness of the first lens is d1, and the following relationship is satisfied:
0.35≤f1/f≤1.42；
-8.26≤(R1+R2)/(R1-R2)≤-2.59；
0.05≤d1/TTL≤0.20。
preferably, the focal length of the second lens is f2, the curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, the on-axis thickness of the first lens is d3, and the following relationship is satisfied:
0.42≤f2/f≤1.68；
-7.47≤(R3+R4)/(R3-R4)≤-1.10；
0.01≤d3/TTL≤0.10。
preferably, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, and the on-axis thickness of the third lens is d5, which satisfy the following relations:
-1.30≤f3/f≤-0.36；
0.62≤(R5+R6)/(R5-R6)≤2.47；
0.01≤d5/TTL≤0.06。
preferably, the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, and the following relation is satisfied:
0.88≤f4/f≤9.13；
0.02≤d7/TTL≤0.14。
preferably, the focal length of the fifth lens is f5, the curvature radius of the object-side surface of the fifth lens is R9, the curvature radius of the image-side surface of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, and the following relationship is satisfied:
0.41≤f5/f≤1.58；
1.23≤(R9+R10)/(R9-R10)≤4.13；
0.02≤d9/TTL≤0.14。
preferably, the radius of curvature of the object-side surface of the sixth lens element is R11, the radius of curvature of the image-side surface of the sixth lens element is R12, and the on-axis thickness of the sixth lens element is d11, which satisfy the following relation:
-1.11≤(R11+R12)/(R11-R12)≤0.34；
0.01≤d11/TTL≤0.08。
preferably, the F-number of the imaging optical lens is less than or equal to 3.50.
The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, and has characteristics of a large aperture, a long focal length, and an ultra-thin thickness, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens which are constituted by imaging elements such as a CCD and a CMOS for high pixel.
Drawings
Fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment of the present invention;
FIG. 2 is a schematic axial aberration diagram of the imaging optical lens of FIG. 1;
fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;
FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens of FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment of the present invention;
FIG. 6 is a schematic axial aberration diagram of the imaging optical lens of FIG. 5;
fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;
FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens of FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment of the present invention;
fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;
fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;
fig. 12 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(first embodiment)
Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An optical element such as an optical filter (filter) GF may be disposed between the sixth lens L6 and the image plane Si.
The first lens L1 is made of glass, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of plastic.
Defining the focal length f of the entire image pickup optical lens 10 and the focal length f1 of the first lens L1, the following relationships are satisfied: f1/f is 0.70-0.95, and the ratio of the focal length f1 of the first lens L1 to the total focal length is specified. And the system is favorable to be ultra-thin within the condition range.
The total optical length of the image pickup optical lens is defined as TTL, the axial distance from the image side surface of the sixth lens L6 to the image surface is BF, BF/TTL is more than or equal to 0.35 and less than or equal to 0.55, and when the BF/TTL meets the conditions, assembly of the system and the electronic device is facilitated. Preferably, 0.37. ltoreq. BF/TTL. ltoreq.0.55 is satisfied.
The curvature radius of the object side surface of the fourth lens L4 is defined as R7, the curvature radius of the image side surface of the fourth lens L4 is defined as R8, -10.00 ≦ (R7+ R8)/(R7-R8) ≦ -1.50, and the shape of the fourth lens L4 is defined, so that the deflection degree of light rays passing through the lens can be alleviated within the range defined by the conditional expression, and the aberration can be effectively reduced. Preferably, it satisfies-9.98 ≦ (R7+ R8)/(R7-R8) ≦ -1.52.
The focal length of the sixth lens L6 is defined as f6, -0.80 ≤ f6/f ≤ 0.50, and the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the system is defined, which contributes to the improvement of the optical system performance within the conditional expression. Preferably, it satisfies-0.79. ltoreq. f 6/f. ltoreq-0.50.
When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the optical total length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL.
In this embodiment, the object-side surface of the first lens element L1 is convex in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof, and has positive refractive power.
The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relations: the shape of the first lens L1 is regulated to be not less than 8.26 and not more than (R1+ R2)/(R1-R2) and not more than-2.59, and when the shape is in a range regulated by a conditional expression, the problem of chromatic aberration on the axis is favorably corrected as the lens is advanced to be ultra-thin and long in focal length. Preferably, -5.16. ltoreq. R1+ R2)/(R1-R2. ltoreq-3.24.
The first lens L1 has an on-axis thickness d1, and satisfies the following relationship: d1/TTL is more than or equal to 0.05 and less than or equal to 0.20, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 1/TTL. ltoreq.0.16.
In this embodiment, the object-side surface of the second lens element L2 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, and has positive refractive power.
The focal length of the second lens L2 is f2, and the following relation is satisfied: f2/f is more than or equal to 0.42 and less than or equal to 1.68, and the positive focal power of the second lens L2 is controlled in a reasonable range, so that the aberration of the optical system can be corrected. Preferably, 0.67. ltoreq. f 2/f. ltoreq.1.34 is satisfied.
The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relations: the shape of the second lens L2 is regulated to be not less than 7.47 and not more than (R3+ R4)/(R3-R4) and not more than-1.10, and the problem of chromatic aberration on the axis is favorably corrected as the lens is advanced to be ultra-thin and long in focal length within the range. Preferably, -4.67 ≦ (R3+ R4)/(R3-R4) ≦ -1.37.
The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.01 and less than or equal to 0.10, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 3/TTL. ltoreq.0.08.
In this embodiment, the object-side surface of the third lens element L3 is convex at the paraxial region thereof and the image-side surface thereof is concave at the paraxial region thereof, and has negative refractive power.
The third lens L3 has a focal length f3, and satisfies the following relationship: 1.30 ≦ f3/f ≦ -0.36, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, -0.81. ltoreq. f 3/f. ltoreq-0.45.
The curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relations: the shape of the third lens is regulated to be not less than 0.62 and not more than (R5+ R6)/(R5-R6) and not more than 2.47, and the deflection degree of the light rays passing through the lens can be alleviated within the range regulated by the conditional expression, so that the aberration can be effectively reduced. Preferably, 0.99 ≦ (R5+ R6)/(R5-R6). ltoreq.1.98.
The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.01 and less than or equal to 0.06, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 5/TTL. ltoreq.0.05.
In this embodiment, the object-side surface of the fourth lens element L4 is convex in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof, and has positive refractive power.
The focal length f4 of the fourth lens L4 satisfies the following relation: f4/f is more than or equal to 0.88 and less than or equal to 9.13, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 1.40. ltoreq. f 4/f. ltoreq.7.31.
The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.02 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 7/TTL. ltoreq.0.11.
In this embodiment, the object-side surface of the fifth lens element L5 is concave at the paraxial region thereof, and the image-side surface thereof is convex at the paraxial region thereof, and has positive refractive power.
The focal length f5 of the fifth lens L5 satisfies the following relation: f5/f is more than or equal to 0.41 and less than or equal to 1.58, and the definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, 0.65. ltoreq. f 5/f. ltoreq.1.27.
The curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relations: 1.23 ≤ (R9+ R10)/(R9-R10) ≤ 4.13, and the shape of the fifth lens L5 is determined, and the lens can be used for correcting aberration of off-axis view angle with the development of ultra-thin long focal length under the condition. Preferably, 1.97 ≦ (R9+ R10)/(R9-R10). ltoreq.3.31.
The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.02 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 9/TTL. ltoreq.0.11.
In this embodiment, the object-side surface of the sixth lens element L6 is concave in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof, and has negative refractive power.
The curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relations: -1.11 ≦ (R11+ R12)/(R11-R12) ≦ 0.34, and the shape of the sixth lens L6 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis angle and the like as the ultra-thin long focal length progresses. Preferably, -0.69 ≦ (R11+ R12)/(R11-R12). ltoreq.0.27.
The on-axis thickness of the sixth lens L6 is d11, and satisfies the following relation: d11/TTL is more than or equal to 0.01 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 11/TTL. ltoreq.0.07.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 3.50 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 3.43 or less.
With such a design, the total optical length TTL of the entire imaging optical lens 10 can be made as short as possible, and the characteristic of miniaturization can be maintained.
The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of reverse curvature and position of stagnation point is mm.
TTL: the total optical length of the camera optical lens is mm;
preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.
Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 1 ]
Wherein each symbol has the following meaning.
S1: an aperture;
r: the radius of curvature of the optical surface and the radius of curvature of the lens as the center;
r1: the radius of curvature of the object-side surface of the first lens L1;
r2: the radius of curvature of the image-side surface of the first lens L1;
r3: the radius of curvature of the object-side surface of the second lens L2;
r4: the radius of curvature of the image-side surface of the second lens L2;
r5: the radius of curvature of the object-side surface of the third lens L3;
r6: the radius of curvature of the image-side surface of the third lens L3;
r7: the radius of curvature of the object-side surface of the fourth lens L4;
r8: the radius of curvature of the image-side surface of the fourth lens L4;
r9: a radius of curvature of the object side surface of the fifth lens L5;
r10: a radius of curvature of the image-side surface of the fifth lens L5;
r11: a radius of curvature of the object side surface of the sixth lens L6;
r12: a radius of curvature of the image-side surface of the sixth lens L6;
r13: radius of curvature of the object side of the optical filter GF;
r14: the radius of curvature of the image-side surface of the optical filter GF;
d: an on-axis thickness of the lenses and an on-axis distance between the lenses;
d 0: the on-axis distance of the stop S1 to the object-side surface of the first lens L1;
d 1: the on-axis thickness of the first lens L1;
d 2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;
d 3: the on-axis thickness of the second lens L2;
d 4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
d 5: the on-axis thickness of the third lens L3;
d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;
d 7: the on-axis thickness of the fourth lens L4;
d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;
d 9: the on-axis thickness of the fifth lens L5;
d 10: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;
d 11: the on-axis thickness of the sixth lens L6;
d 12: the on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the optical filter GF;
d 13: on-axis thickness of the optical filter GF;
d 14: the on-axis distance from the image side surface of the optical filter GF to the image surface;
nd: the refractive index of the d-line;
nd 1: the refractive index of the d-line of the first lens L1;
nd 2: the refractive index of the d-line of the second lens L2;
nd 3: the refractive index of the d-line of the third lens L3;
nd 4: the refractive index of the d-line of the fourth lens L4;
nd 5: the refractive index of the d-line of the fifth lens L5;
nd 6: the refractive index of the d-line of the sixth lens L6;
ndg: the refractive index of the d-line of the optical filter GF;
vd: an Abbe number;
v 1: abbe number of the first lens L1;
v 2: abbe number of the second lens L2;
v 3: abbe number of the third lens L3;
v 4: abbe number of the fourth lens L4;
v 5: abbe number of the fifth lens L5;
v 6: abbe number of the sixth lens L6;
vg: abbe number of the optical filter GF.
Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 2 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric coefficients.
IH: image height
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16 (1)
For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
| Number of points of inflection | Position of |
Position of reverse curvature 2 | Position of |
|
| P1R1 | ||||
| P1R2 | ||||
| P2R1 | ||||
| | ||||
| P3R1 | ||||
| P3R2 | ||||
| 1 | 1.395 | |||
| | ||||
| P4R2 | ||||
| 3 | 0.665 | 1.045 | 1.315 | |
| | ||||
| P5R2 | ||||
| 1 | 1.445 | |||
| | ||||
| P6R2 | ||||
| 1 | 0.325 |
[ TABLE 4 ]
| Number of stagnation points | Location of |
|
| P1R1 | ||
| P1R2 | ||
| P2R1 | ||
| P2R2 | ||
| P3R1 | ||
| P3R2 | ||
| P4R1 | ||
| P4R2 | ||
| P5R1 | ||
| | ||
| P6R1 | ||
| P6R2 | ||
| 1 | 0.575 |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, after passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.
Table 13 shown later shows values of various numerical values in examples 1, 2, and 3 corresponding to the parameters specified in the conditional expressions.
As shown in table 13, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.247mm, a full field image height of 2.502mm, a diagonal field angle of 19.53 °, a long focal length, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 7 ]
[ TABLE 8 ]
| Number of stagnation points | Location of |
|
| P1R1 | ||
| P1R2 | ||
| P2R1 | ||
| P2R2 | ||
| P3R1 | ||
| | ||
| P4R1 | ||
| P4R2 | ||
| 1 | 0.575 | |
| P5R1 | ||
| | ||
| P6R1 | ||
| P6R2 | ||
| 1 | 0.935 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, after passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 13, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.182mm, a full field image height of 2.502mm, a diagonal field angle of 19.96 °, a long focal length, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(third embodiment)
The third embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 10 ]
Tables 11 and 12 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 11 ]
| Number of points of inflection | Position of |
|
| | ||
| P1R2 | ||
| 1 | 1.635 | |
| P2R1 | ||
| P2R2 | ||
| | ||
| P3R2 | ||
| P4R1 | ||
| 1 | 1.475 | |
| |
1 | 0.795 |
| | ||
| P5R2 | ||
| P6R1 | ||
| 1 | 1.215 | |
| P6R2 |
[ TABLE 12 ]
| Number of stagnation points | Location of |
|
| P1R1 | ||
| P1R2 | ||
| P2R1 | ||
| P2R2 | ||
| P3R1 | ||
| | ||
| P4R1 | ||
| P4R2 | ||
| 1 | 1.415 | |
| P5R1 | ||
| P5R2 | ||
| P6R1 | ||
| P6R2 |
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, after passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.818mm, a full field image height of 2.502mm, a diagonal field angle of 17.11 °, a long focal length, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 13 ]
| Parameter and condition formula | Example 1 | Example 2 | Example 3 |
| f | 14.440 | 14.220 | 16.382 |
| f1 | 11.402 | 13.466 | 11.516 |
| f2 | 13.876 | 15.887 | 13.736 |
| f3 | -8.427 | -9.228 | -8.901 |
| f4 | 52.748 | 24.916 | 99.747 |
| f5 | 13.015 | 15.017 | 13.316 |
| f6 | -9.650 | -10.946 | -8.272 |
| f12 | 6.928 | 8.135 | 6.800 |
| FNO | 3.40 | 3.40 | 3.40 |
| f1/f | 0.79 | 0.95 | 0.70 |
| BF/TTL | 0.51 | 0.39 | 0.54 |
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. An imaging optical lens, comprising six lens elements in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;
the object-side surface of the first lens element is convex at the paraxial region, the image-side surface of the first lens element is concave at the paraxial region, the object-side surface of the second lens element is convex at the paraxial region, the image-side surface of the second lens element is concave at the paraxial region, the object-side surface of the third lens element is convex at the paraxial region, the image-side surface of the fourth lens element is concave at the paraxial region, the object-side surface of the fifth lens element is concave at the paraxial region, the image-side surface of the fifth lens element is convex at the paraxial region, the object-side surface of the sixth lens element is concave at the paraxial region, and the image-side surface of the sixth lens element is concave at the paraxial region;
the focal length of the image pickup optical lens is f, the total optical length of the image pickup optical lens is TTL, the focal length of the first lens is f1, the axial distance from the image side surface of the sixth lens to the image surface is BF, the focal length of the third lens is f3, and the following relational expression is satisfied:
0.70≤f1/f≤0.95；
0.35≤BF/TTL≤0.55；
-1.30≤f3/f≤-0.36。
2. the imaging optical lens according to claim 1, wherein a radius of curvature of an object-side surface of the fourth lens element is R7, and a radius of curvature of an image-side surface of the fourth lens element is R8, and the following relational expressions are satisfied:
-10.00≤(R7+R8)/(R7-R8)≤-1.50。
3. an imaging optical lens according to claim 1, wherein a focal length of the sixth lens element is f6, and the following relationship is satisfied:
-0.80≤f6/f≤-0.50。
4. the imaging optical lens according to claim 1, wherein a radius of curvature of the object-side surface of the first lens is R1, a radius of curvature of the image-side surface of the first lens is R2, an on-axis thickness of the first lens is d1, and the following relationship is satisfied:
-8.26≤(R1+R2)/(R1-R2)≤-2.59；
0.05≤d1/TTL≤0.20。
5. the imaging optical lens according to claim 1, wherein the second lens has a focal length f2, a radius of curvature of an object-side surface of the second lens is R3, a radius of curvature of an image-side surface of the second lens is R4, and an on-axis thickness of the first lens is d3, and the following relationship is satisfied:
0.42≤f2/f≤1.68；
-7.47≤(R3+R4)/(R3-R4)≤-1.10；
0.01≤d3/TTL≤0.10。
6. the imaging optical lens of claim 5, wherein the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, and the on-axis thickness of the third lens is d5, satisfying the following relationship:
0.62≤(R5+R6)/(R5-R6)≤2.47；
0.01≤d5/TTL≤0.06。
7. the image-capturing optical lens according to claim 1, wherein the fourth lens has a focal length f4, an on-axis thickness d7, and satisfies the following relationship:
0.88≤f4/f≤9.13；
0.02≤d7/TTL≤0.14。
8. the imaging optical lens according to claim 1, wherein the fifth lens has a focal length f5, a radius of curvature of an object-side surface of the fifth lens is R9, a radius of curvature of an image-side surface of the fifth lens is R10, an on-axis thickness of the fifth lens is d9, and the following relationship is satisfied:
0.41≤f5/f≤1.58；
1.23≤(R9+R10)/(R9-R10)≤4.13；
0.02≤d9/TTL≤0.14。
9. the imaging optical lens according to claim 1, wherein a radius of curvature of the object-side surface of the sixth lens is R11, a radius of curvature of the image-side surface of the sixth lens is R12, and an on-axis thickness of the sixth lens is d11, and the following relationship is satisfied:
-1.11≤(R11+R12)/(R11-R12)≤0.34；
0.01≤d11/TTL≤0.08。
10. the imaging optical lens according to claim 1, characterized in that an aperture F-number of the imaging optical lens is less than or equal to 3.50.
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| CN204302563U (en) * | 2014-07-02 | 2015-04-29 | 株式会社光学逻辑 | Pick-up lens |
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| KR20180032058A (en) * | 2016-09-21 | 2018-03-29 | 삼성전자주식회사 | Optical lens assembly and electronic apparatus having the same |
| CN112147755A (en) * | 2019-06-27 | 2020-12-29 | 华为技术有限公司 | Optical lens group, camera and terminal equipment |
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| CN204302563U (en) * | 2014-07-02 | 2015-04-29 | 株式会社光学逻辑 | Pick-up lens |
| CN105044880A (en) * | 2015-03-11 | 2015-11-11 | 瑞声声学科技(深圳)有限公司 | Camera lens system |
| CN106168702A (en) * | 2015-05-22 | 2016-11-30 | 先进光电科技股份有限公司 | Optical imaging system |
| CN107515456A (en) * | 2016-06-16 | 2017-12-26 | 大立光电股份有限公司 | Optical image lens assembly, image capturing device and electronic device |
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