CN107942483B - Image pickup optical lens - Google Patents

Image pickup optical lens Download PDF

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Publication number
CN107942483B
CN107942483B CN201710974748.5A CN201710974748A CN107942483B CN 107942483 B CN107942483 B CN 107942483B CN 201710974748 A CN201710974748 A CN 201710974748A CN 107942483 B CN107942483 B CN 107942483B
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China
Prior art keywords
lens
image
focal length
curvature
equal
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CN201710974748.5A
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CN107942483A (en
Inventor
石荣宝
张磊
王燕妹
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AAC Technologies Pte Ltd
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AAC Technologies Pte Ltd
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Priority to CN201710974748.5A priority Critical patent/CN107942483B/en
Priority claimed from JP2017231001A external-priority patent/JP6366151B1/en
Publication of CN107942483A publication Critical patent/CN107942483A/en
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045Miniaturised 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/06Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; and satisfies the following relationships: f1/f is more than or equal to 1.51 and less than or equal to 2.5, n1 is more than or equal to 1.7 and less than or equal to 2.2, and f3/f4 is more than or equal to 2; -10 ≤ (R13+ R14)/(R13-R14) is ≤ 2; d1/TTL is more than or equal to 0.01 and less than or equal to 0.2. The imaging optical lens can obtain high imaging performance and low TTL.

Description

Image pickup optical lens
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) Sensor, and due to the advanced semiconductor manufacturing process 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, so that 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. A wide-angle imaging lens having excellent optical characteristics, being ultra-thin and having sufficient chromatic aberration correction is in demand.
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 ultra-thinning and wide angle 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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the refractive index of the first lens is n 1; the on-axis thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, the curvature radius of the object-side surface of the seventh lens is R13, and the curvature radius of the image-side surface of the seventh lens is R14, and the following relational expression is satisfied:
1.51≤f1/f≤2.5,1.7≤n1≤2.2,-2≤f3/f4≤2;
-10≤(R13+R14)/(R13-R14)≤2;
0.01≤d1/TTL≤0.2。
compared with the prior art, the embodiment of the invention utilizes the arrangement mode of the lenses and utilizes the common cooperation of the lenses with specific relation on data of focal length, refractive index, total optical length, axial thickness and curvature radius of the shooting optical lens, so that the shooting optical lens can meet the requirements of ultra-thinning and wide angle while obtaining high imaging performance.
Preferably, the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface;
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, and the on-axis thickness of the first lens is d1, and the following relationships are satisfied:
-8.05≤(R1+R2)/(R1-R2)≤-2.33;
0.17≤d1≤0.85。
preferably, the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface;
the focal length of the image pickup optical lens is f, 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 second lens is d3, and the following relational expression is satisfied:
-7.12≤f2/f≤-2.24;
3.48≤(R3+R4)/(R3-R4)≤12.30;
0.09≤d3≤0.44。
preferably, the third lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the third lens is f3, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, the on-axis thickness of the third lens is d5, and the following relations are satisfied:
0.55≤f3/f≤1.74;
0.14≤(R5+R6)/(R5-R6)≤0.51;
0.30≤d5≤0.90。
preferably, the fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the fourth lens is R7, the curvature radius of the image side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the following relational expression is satisfied:
-4.84≤f4/f≤-1.47;
-2.76≤(R7+R8)/(R7-R8)≤-0.88;
0.12≤d7≤0.35。
preferably, the fifth lens element with positive refractive power has a convex object-side surface and a concave image-side surface;
the focal length of the image pickup optical lens is f, 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 relations are satisfied:
7.45≤f5/f≤106.09;
-129.12≤(R9+R10)/(R9-R10)≤-4.93;
0.15≤d9≤0.45。
preferably, the sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, the curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, and the following relations are satisfied:
0.52≤f6/f≤1.69;
-0.39≤(R11+R12)/(R11-R12)≤-0.06;
0.23≤d11≤0.79。
preferably, the seventh lens element with negative refractive power has a convex object-side surface and a concave image-side surface;
the focal length of the image pickup optical lens is f, the focal length of the seventh lens is f7, the on-axis thickness of the seventh lens is d13, and the following relational expression is satisfied:
-1.49≤f7/f≤-0.49;
0.13≤d13≤0.38。
preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 4.94 mm.
Preferably, the F-number of the imaging optical lens is less than or equal to 1.87.
The invention has the advantages that the optical camera lens has excellent optical characteristics, is ultrathin, has wide angle and can fully correct chromatic aberration, and is particularly suitable for mobile phone camera lens components and WEB camera lenses which are composed of high-pixel CCD, CMOS and other camera elements.
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 shown in fig. 5.
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 image pickup optical lens 10 according to a first embodiment of the present invention, and the image pickup optical lens 10 includes seven 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, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter (filter) GF may be disposed between the seventh lens L7 and the image plane Si. The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic.
Here, it is defined that the focal length of the entire imaging optical lens 10 is f, the focal length of the first lens L1 is f1, the focal length of the third lens L3 is f3, the focal length of the fourth lens L4 is f4, the refractive index of the first lens L1 is n1, the on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens is TTL, the radius of curvature of the object-side surface of the seventh lens L7 is R13, and the radius of curvature of the image-side surface of the seventh lens L7 is R14. The imaging optical lens 10 satisfies the following relational expression: f1/f is more than or equal to 1.51 and less than or equal to 2.5, n1 is more than or equal to 1.7 and less than or equal to 2.2, and f3/f4 is more than or equal to 2; -10 ≤ (R13+ R14)/(R13-R14) is ≤ 2; d1/TTL is more than or equal to 0.01 and less than or equal to 0.2.
F1/f is not less than 1.51 and not more than 2.5, which defines the positive refractive power of the first lens element L1. When the value exceeds the lower limit, the lens is advantageous for the ultra-thin lens, but the positive refractive power of the first lens element L1 is too strong to correct the aberration, and the lens is not advantageous for the wide angle. On the other hand, if the refractive power exceeds the upper limit predetermined value, the positive refractive power of the first lens element is too weak, and the lens barrel is difficult to be made thinner. Preferably, 1.52. ltoreq. f 1/f. ltoreq.2.02 is satisfied.
N1 is 1.7-2.2, and the refractive index of the first lens L1 is defined, so that the lens is more favorable for the development of ultra-thinness and correction of aberration. Preferably, 1.72. ltoreq. n 4. ltoreq.1.97 is satisfied.
F3/f4 is less than or equal to 2, and the ratio of the focal length f3 of the third lens L3 to the focal length f4 of the fourth lens L4 is regulated, so that the sensitivity of the optical lens group for shooting can be effectively reduced, and the imaging quality is further improved. Preferably, it satisfies-1.248. ltoreq. f3/f 4. ltoreq. 0.761.
-10 ≦ (R13+ R14)/(R13-R14) ≦ 2, and the shape of the seventh lens L7 is defined, and when out of range, it becomes difficult to correct off-axis aberration of the angle of view and the like as the range progresses to ultra-thin wide-angle. Preferably, it satisfies-4.17 ≦ (R13+ R14)/(R13-R14). ltoreq.1.88.
D1/TTL is more than or equal to 0.01 and less than or equal to 0.2, the ratio of the on-axis thickness of the first lens L1 to the total optical length TTL of the shooting optical lens 10 is specified, and ultra-thinning is favorably realized. Preferably, 0.043. ltoreq. d 7/TTL. ltoreq.0.163 is satisfied.
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 at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, with positive refractive power; the focal length of the entire image-taking optical lens is f, the focal length of the first lens L1 is f1, the radius of curvature of the object-side surface of the first lens L1 is R1, the radius of curvature of the image-side surface of the first lens L1 is R2, and the on-axis thickness d1 of the first lens L1 satisfies the following relational expression: 8.05 ≦ (R1+ R2)/(R1-R2) ≦ -2.33, the shape of the first lens is controlled appropriately so that the first lens can correct the system spherical aberration effectively; d1 is more than or equal to 0.17 and less than or equal to 0.85, which is beneficial to realizing ultra-thinning. Preferably, -5.03 ≦ (R1+ R2)/(R1-R2) ≦ -2.91; d1 is more than or equal to 0.27 and less than or equal to 0.68.
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, with negative refractive power; the focal length f of the entire image-taking optical lens 10, the focal length f2 of the second lens L2, the radius of curvature R3 of the object-side surface of the second lens L2, the radius of curvature R4 of the image-side surface of the second lens L2, and the on-axis thickness d3 of the second lens L2 satisfy the following relations: 7.12 ≦ f2/f ≦ -2.24 for reasonably and effectively balancing the spherical aberration produced by the first lens L1 having positive power and the amount of curvature of field of the system by controlling the negative power of the second lens L2 to a reasonable range; 3.48 ≦ (R3+ R4)/(R3-R4) ≦ 12.30, defines the shape of the second lens L2, and when out of range, it becomes difficult to correct the problem of chromatic aberration on the axis as the lens progresses to an ultra-thin wide angle; d3 is more than or equal to 0.09 and less than or equal to 0.44, which is beneficial to realizing ultra-thinning. Preferably, -4.45. ltoreq. f 2/f. ltoreq-2.81; (R3+ R4)/(R3-R4) is not more than 5.58 and not more than 9.84; d3 is more than or equal to 0.15 and less than or equal to 0.35.
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 convex at the paraxial region thereof, and has positive refractive power; the focal length f of the entire image-taking optical lens 10, the focal length f3 of the third lens L3, the radius of curvature R5 of the object-side surface of the third lens L3, the radius of curvature R6 of the image-side surface of the third lens L3, and the on-axis thickness d5 of the third lens L3 satisfy the following relations: f3/f is more than or equal to 0.55 and less than or equal to 1.74, which is beneficial to the system to obtain good ability of balancing field curvature so as to effectively improve the image quality; the ratio of (R5+ R6)/(R5-R6) is not less than 0.14 and not more than 0.51, the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, and the generation of poor molding and stress caused by the overlarge surface curvature of the third lens L3 is avoided; d5 is more than or equal to 0.30 and less than or equal to 0.90, which is beneficial to realizing ultra-thinning. Preferably, 0.87 ≦ f3/f ≦ 1.39; (R5+ R6)/(R5-R6) is not more than 0.22 and not more than 0.41; d5 is more than or equal to 0.48 and less than or equal to 0.72.
In this embodiment, the object-side surface of the fourth lens element L4 is concave at the paraxial region thereof, and the image-side surface thereof is convex at the paraxial region thereof, with negative refractive power; the focal length f of the entire image-taking optical lens 10, the focal length f4 of the fourth lens L4, the radius of curvature R7 of the object-side surface of the fourth lens L4, the radius of curvature R8 of the image-side surface of the fourth lens L4, and the on-axis thickness d7 of the fourth lens L4 satisfy the following relations: 4.84 ≦ f4/f ≦ -1.47, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power; -2.76 ≦ (R7+ R8)/(R7-R8) ≦ -0.88, and the shape of the fourth lens L4 is specified, and when out of range, it is difficult to correct the aberration of the off-axis angle with the development of ultra-thin and wide-angle angles; d7 is more than or equal to 0.12 and less than or equal to 0.35, which is beneficial to realizing ultra-thinning. Preferably, -3.03. ltoreq. f 4/f. ltoreq-1.84; -1.72 ≤ (R7+ R8)/(R7-R8) ≤ 1.11; d7 is more than or equal to 0.18 and less than or equal to 0.28.
In this embodiment, the object-side surface of the fifth lens element L5 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 f of the entire image-taking optical lens 10, the focal length f5 of the fifth lens L5, the radius of curvature R9 of the object-side surface of the fifth lens L5, the radius of curvature R10 of the image-side surface of the fifth lens L5, and the on-axis thickness d9 of the fifth lens L5 satisfy the following relations: f5/f is not less than 7.45 and not more than 106.09, the limitation on the fifth lens L5 can effectively enable the light ray angle of the camera lens to be smooth, and the tolerance sensitivity is reduced; 129.12 ≦ (R9+ R10)/(R9-R10) ≦ -4.93, and the shape of the fifth lens L5 is specified, and when the condition is out of the range, it is difficult to correct the aberration of the off-axis angle and the like with the development of ultra-thin wide-angle; d9 is more than or equal to 0.15 and less than or equal to 0.45, which is beneficial to realizing ultra-thinning. Preferably, 11.91 ≦ f5/f ≦ 84.87; 80.70-6.16 percent (R9+ R10)/(R9-R10); d9 is more than or equal to 0.23 and less than or equal to 0.36.
In this embodiment, the object-side surface of the sixth lens element L6 is convex 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 f of the entire image-taking optical lens 10, the focal length f6 of the sixth lens L6, the radius of curvature R11 of the object-side surface of the sixth lens L6, the radius of curvature R12 of the image-side surface of the sixth lens L6, and the on-axis thickness d11 of the sixth lens L6 satisfy the following relations: f6/f is more than or equal to 0.52 and less than or equal to 1.69, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power; -0.39 ≦ (R11+ R12)/(R11-R12) ≦ -0.06, and the shape of the sixth lens L6 is specified, and when the condition is out of the range, it is difficult to correct the aberration of the off-axis angle with the development of ultra-thin wide-angle; d11 is more than or equal to 0.23 and less than or equal to 0.79, which is beneficial to realizing ultra-thinning. Preferably, 0.83 ≦ f6/f ≦ 1.35; -0.24 ≤ (R11+ R12)/(R11-R12) ≤ 0.08; d11 is more than or equal to 0.36 and less than or equal to 0.63.
In this embodiment, the object-side surface of the seventh lens element L7 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, with negative refractive power; the focal length f of the entire imaging optical lens 10, the focal length f7 of the seventh lens L7, and the on-axis thickness d13 of the seventh lens L7 satisfy the following relationships: -1.49 ≦ f7/f ≦ -0.49, allowing better imaging quality and lower sensitivity of the system through a reasonable distribution of optical power; d13 is more than or equal to 0.13 and less than or equal to 0.38, which is beneficial to realizing ultra-thinning. Preferably, -0.93. ltoreq. f 7/f. ltoreq-0.61; d13 is more than or equal to 0.20 and less than or equal to 0.31.
In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 4.94 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 4.72.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 1.87 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 1.83 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. Distance, radius and center thickness are in mm.
TTL optical length (on-axis distance from the object-side surface of the 1 st lens L1 to the image plane);
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.
The following shows design data of the image pickup optical lens 10 according to the first embodiment of the present invention, the units of focal length, distance, radius, and center thickness being mm.
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, diaphragm;
r is the curvature radius of the optical surface and the central curvature radius when the lens is used;
r1 radius of curvature of object-side surface of first lens L1;
r2 radius of curvature of image side surface of first lens L1;
r3 radius of curvature of object-side surface of second lens L2;
r4 radius of curvature of the image-side surface of the second lens L2;
r5 radius of curvature of object-side surface of third lens L3;
r6 radius of curvature of the image-side surface of the third lens L3;
r7 radius of curvature of object-side surface of fourth lens L4;
r8 radius of curvature of image side surface of the fourth lens L4;
r9 radius of curvature of object-side surface of fifth lens L5;
r10 radius of curvature of the image-side surface of the fifth lens L5;
r11 radius of curvature of object-side surface of sixth lens L6;
r12 radius of curvature of the image-side surface of the sixth lens L6;
r13 radius of curvature of object-side surface of seventh lens L7;
r14 radius of curvature of the image-side surface of the seventh lens L7;
r15 radius of curvature of the object side of the optical filter GF;
r16 radius of curvature of image side of optical filter GF;
d is the on-axis thickness of the lenses and the 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;
d1: the on-axis thickness of the first lens L1;
d2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;
d3: the on-axis thickness of the second lens L2;
d4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
d5: 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: an on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;
d 13: the on-axis thickness of the seventh lens L7;
d 14: the on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the optical filter GF;
d 15: on-axis thickness of the optical filter GF;
d 16: the on-axis distance from the image side surface of the optical filter GF to the image surface;
nd is the refractive index of the d line;
nd1 refractive index of d-line of the first lens L1;
nd2 refractive index of d-line of the second lens L2;
nd3 refractive index of d-line of the third lens L3;
nd4 refractive index of d-line of the fourth lens L4;
nd5 refractive index of d-line of the fifth lens L5;
nd 6: the refractive index of the d-line of the sixth lens L6;
nd 7: the refractive index of the d-line of the seventh lens L7;
ndg, refractive index of d-line of optical filter GF;
vd is 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;
v 7: abbe number of the seventh lens L7;
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 embodiment 1 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 embodiment 1 of the present invention. Wherein, R1 and R2 represent the object-side surface and the image-side surface of the first lens L1, R3 and R4 represent the object-side surface and the image-side surface of the second lens L2, R5 and R6 represent the object-side surface and the image-side surface of the third lens L3, R7 and R8 represent the object-side surface and the image-side surface of the fourth lens L4, R9 and R10 represent the object-side surface and the image-side surface of the fifth lens L5, R11 and R12 represent the object-side surface and the image-side surface of the sixth lens L6, and R13 and R14 represent the object-side surface and the image-side surface of the seventh lens L7, 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 reverse curvature 1 Position of reverse curvature 2
R1 0
R2 0
R3 1 0.925
R4 0
R5 0
R6 0
R7 0
R8 0
R9 1 0.325
R10 2 0.265 1.215
R11 1 0.625
R12 2 0.245 0.695
R13 2 0.285 1.315
R14 2 0.495 2.225
[ TABLE 4 ]
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 555nm, 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 470nm 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 9 appearing later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1 and 2.
As shown in table 9, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2mm, a full field height of 2.9335mm, a diagonal field angle of 77.20 °, a wide angle and a thin 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 embodiment 2 of the present invention.
[ TABLE 7 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2
R1 0
R2 0
R3 1 0.915
R4 0
R5 0
R6 0
R7 0
R8 0
R9 1 0.295
R10 2 0.235 1.175
R11 1 0.635
R12 2 0.245 0.695
R13 2 0.285 1.295
R14 2 0.485 2.195
[ TABLE 8 ]
Number of stagnation points Location of stagnation 1 Location of stagnation 2
R1 0
R2 0
R3 0
R4 0
R5 0
R6 0
R7 0
R8 0
R9 1 0.535
R10 1 0.395
R11 1 0.995
R12 2 0.465 0.875
R13 1 0.495
R14 1 1.145
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470nm, 555nm, 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 470nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 9, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2mm, a full field height of 2.9335mm, a diagonal field angle of 77.01 °, a wide angle and a thin profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 9 ]
Parameter and condition formula Example 1 Example 2
f 3.615 3.630
f1 5.536 5.560
f2 -12.170 -12.929
f3 4.191 3.960
f4 -8.750 -8.000
f5 255.676 54.059
f6 3.756 4.092
f7 -2.659 -2.713
f3/f4 -0.479 -0.495
(R1+R2)/(R1-R2) -3.496 -4.023
(R3+R4)/(R3-R4) 6.969 8.200
(R5+R6)/(R5-R6) 0.280 0.339
(R7+R8)/(R7-R8) -1.380 -1.327
(R9+R10)/(R9-R10) -64.560 -7.389
(R11+R12)/(R11-R12) -0.195 -0.092
(R13+R14)/(R13-R14) 1.664 1.764
f1/f 1.531 1.532
f2/f -3.367 -3.562
f3/f 1.159 1.091
f4/f -2.420 -2.204
f5/f 70.726 14.893
f6/f 1.039 1.127
f7/f -0.736 -0.747
d1 0.341 0.564
d3 0.295 0.188
d5 0.600 0.600
d7 0.230 0.230
d9 0.293 0.300
d11 0.524 0.456
d13 0.255 0.250
Fno 1.808 1.815
TTL 4.489 4.491
d1/TTL 0.076 0.126
n1 1.7300 1.7300
n2 1.6400 1.6400
n3 1.5440 1.5440
n4 1.6400 1.6400
n5 1.6400 1.6400
n6 1.5440 1.5440
n7 1.5350 1.5350
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, in order from an object side to an image side, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with positive refractive power, the fourth lens element with negative refractive power, the fifth lens element with positive refractive power, the sixth lens element with positive refractive power, and the seventh lens element with negative refractive power;
the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the refractive index of the first lens is n 1; the on-axis thickness of the first lens is d1, the total optical length of the imaging optical lens is TTL, the curvature radius of the object-side surface of the seventh lens is R13, and the curvature radius of the image-side surface of the seventh lens is R14, and the following relational expression is satisfied:
1.51≤f1/f≤2.5,1.7≤n1≤2.2,-2≤f3/f4≤2;
-10≤(R13+R14)/(R13-R14)≤2;
0.01≤d1/TTL≤0.2。
2. the imaging optical lens of claim 1, wherein the first lens object-side surface is convex at the paraxial region and the first lens image-side surface is concave at the paraxial region;
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, and the on-axis thickness of the first lens is d1, and the following relationships are satisfied:
-8.05≤(R1+R2)/(R1-R2)≤-2.33;
0.17mm≤d1≤0.85mm。
3. the imaging optical lens of claim 1, wherein the second lens object-side surface is convex at the paraxial region and the second lens image-side surface is concave at the paraxial region;
the focal length of the image pickup optical lens is f, 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 second lens is d3, and the following relational expression is satisfied:
-7.12≤f2/f≤-2.24;
3.48≤(R3+R4)/(R3-R4)≤12.30;
0.09mm≤d3≤0.44mm。
4. the imaging optical lens assembly of claim 1, wherein the third lens object-side surface is convex in a paraxial region and the third lens image-side surface is convex in a paraxial region;
the focal length of the image pickup optical lens is f, the focal length of the third lens is f3, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, the on-axis thickness of the third lens is d5, and the following relations are satisfied:
0.55≤f3/f≤1.74;
0.14≤(R5+R6)/(R5-R6)≤0.51;
0.30mm≤d5≤0.90mm。
5. the imaging optical lens of claim 1, wherein the fourth lens object-side surface is concave at the paraxial region and the fourth lens image-side surface is convex at the paraxial region;
the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the fourth lens is R7, the curvature radius of the image side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the following relational expression is satisfied:
-4.84≤f4/f≤-1.47;
-2.76≤(R7+R8)/(R7-R8)≤-0.88;
0.12mm≤d7≤0.35mm。
6. the imaging optical lens of claim 1, wherein the fifth lens object-side surface is convex at the paraxial region and the fifth lens image-side surface is concave at the paraxial region;
the focal length of the image pickup optical lens is f, 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 relations are satisfied:
7.45≤f5/f≤106.09;
-129.12≤(R9+R10)/(R9-R10)≤-4.93;
0.15mm≤d9≤0.45mm。
7. the imaging optical lens of claim 1, wherein the sixth lens object-side surface is convex at the paraxial region and the sixth lens image-side surface is convex at the paraxial region;
the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, the curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, and the following relations are satisfied:
0.52≤f6/f≤1.69;
-0.39≤(R11+R12)/(R11-R12)≤-0.06;
0.23mm≤d11≤0.79mm。
8. the imaging optical lens of claim 1, wherein the seventh lens object-side surface is convex at the paraxial region and the seventh lens image-side surface is concave at the paraxial region;
the focal length of the image pickup optical lens is f, the focal length of the seventh lens is f7, the on-axis thickness of the seventh lens is d13, and the following relational expression is satisfied:
-1.49≤f7/f≤-0.49;
0.13mm≤d13≤0.38mm。
9. a camera optical lens according to claim 1, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 4.94 mm.
10. A camera optical lens according to claim 1, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 1.87.
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