CN108983392B

CN108983392B - Image pickup optical lens

Info

Publication number: CN108983392B
Application number: CN201810923414.XA
Authority: CN
Inventors: 生沼健司; 张磊; 王燕妹; 黄子轩
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2018-08-14
Filing date: 2018-08-14
Publication date: 2020-07-17
Anticipated expiration: 2038-08-14
Also published as: CN108983392A

Abstract

the invention relates to the field of optical lenses, and discloses a photographic optical lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side, wherein the second lens has negative refractive power, the third lens has negative refractive power, the first lens is made of plastic, the second lens is made of plastic, the third lens is made of glass, the fourth lens is made of plastic, the fifth lens is made of glass, and the sixth lens is made of plastic, and satisfies the following relational expressions of f1/f being more than or equal to 0.5 and less than or equal to 5, n3 being more than or equal to 1.7 and less than or equal to 2.2, n5 being more than or equal to 1.7 and less than or equal to 2.2, and d3/TT L being more than or equal to 0.15.

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, and a sixth lens; the second lens element with negative refractive power and the third lens element with negative refractive power;

The first lens is made of plastic, the second lens is made of plastic, the third lens is made of glass, the fourth lens is made of plastic, the fifth lens is made of glass, and the sixth lens is made of plastic;

the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the refractive index of the third lens is n3, the refractive index of the fifth lens is n5, the on-axis thickness of the second lens is d3, the total optical length of the image pickup optical lens is TT L, and the following relational expression is satisfied:

0.5≤f1/f≤5；

1.7≤n3≤2.2；

1.7≤n5≤2.2；

0.03≤d3/TTL≤0.15。

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 imaging optical lens satisfies the following relations of 0.681 ≤ f1/f ≤ 3.116, 1.779 ≤ n3 ≤ 2.061, 1.706 ≤ n5 ≤ 1.986, and 0.036 ≤ d3/TT L ≤ 0.099.

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 element is R1, the radius of curvature of the image-side surface of the first lens element is R2, and the on-axis thickness of the first lens element is d1, and the following relations of-3.55 ≦ (R1+ R2)/(R1-R2) ≦ -0.72, and 0.04 ≦ d1/TT L ≦ 0.16.

preferably, the photographic optical lens satisfies the following relational expression of-2.22 ≦ (R1+ R2)/(R1-R2) ≦ -0.90, and 0.06 ≦ d1/TT L ≦ 0.13.

Preferably, the object-side surface of the second lens element is convex in the paraxial region, and the image-side surface thereof is concave in the paraxial region. The focal length of the second lens is f2, the radius of curvature of the object side surface of the second lens is R3, the radius of curvature of the image side surface of the second lens is R4, and the following relations are satisfied: f2/f is more than or equal to minus 20.8 and less than or equal to minus 1.55; 1.60-19.96 percent (R3+ R4)/(R3-R4).

preferably, the photographic optical lens satisfies the following relational expressions of-13.00 ≤ f2/f ≤ 1.94, 2.56 ≤ (R3+ R4)/(R3-R4) ≤ 15.97, and 0.03 ≤ d3/TT L ≤ 0.06.

preferably, the object side surface of the third lens is concave at the paraxial region, and the image side surface of the third lens is convex at the paraxial region, 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, the on-axis thickness of the third lens is d5, and the following relations are satisfied, wherein f3/f is more than or equal to 7.92 and less than or equal to-1.21, R5+ R6)/(R5-R6 is more than or equal to-1.37, and d5/TT L is more than or equal to 0.02 and less than or equal to 0.07.

preferably, the photographic optical lens satisfies the following relational expressions of-4.95 ≤ f3/f ≤ 1.51, -3.12 ≤ (R5+ R6)/(R5-R6) ≤ 1.72, and 0.03 ≤ d5/TT L ≤ 0.05.

preferably, the fourth lens element has positive refractive power, the object-side surface of the fourth lens element is convex on the paraxial region, the focal length of the fourth lens element is f4, the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, and the following relationships are satisfied, wherein f4/f is 0.91 or more and is 24.23 or less, f 7 and R8)/(R7-R8) is-12.96 or more and is 0.27 or less, and d7/TT L is 0.05 or more and is 0.15 or less.

Preferably, the imaging optical lens satisfies the following relational expression: f4/f is more than or equal to 1.45 and less than or equal to 19.38;

-8.10≤(R7+R8)/(R7-R8)≤-0.34；0.07≤d7/TTL≤0.12。

preferably, the fifth lens element with positive refractive power has a convex image-side surface along the paraxial region, the focal length of the fifth lens element is f5, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, and the following relationships of 0.32 ≦ f5/f ≦ 1.29, 0.39 ≦ (R9+ R10)/(R9-R10) ≦ 1.60, and 0.05 ≦ d9/TT L ≦ 0.18 are satisfied.

preferably, the imaging optical lens satisfies the following relations of 0.51. ltoreq. f 5/f. ltoreq.1.03, 0.63. ltoreq. R9+ R10)/(R9-R10. ltoreq.1.28, and 0.08. ltoreq. d9/TT L. ltoreq.0.14.

preferably, the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface, the object-side surface of the sixth lens element is paraxial, the focal length of the sixth lens element is f6, 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, the on-axis thickness of the sixth lens element is d11, and the following relationships are satisfied, wherein f6/f is more than or equal to-0.32, R11+ R12)/(R11-R12) is more than or equal to-0.38, and d11/TT L is more than or equal to 0.02 and less than or equal to 0.08.

preferably, the photographic optical lens satisfies the following relational expressions of-0.77 ≤ f6/f ≤ 0.40, -0.79 ≤ (R11+ R12)/(R11-R12) ≤ 0.47, and 0.04 ≤ d11/TT L ≤ 0.06.

Preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied: f12/f is more than or equal to 0.61 and less than or equal to 2.01.

Preferably, the imaging optical lens satisfies the following relational expression: f12/f is more than or equal to 0.97 and less than or equal to 1.61.

preferably, the total optical length TT L of the imaging optical lens is less than or equal to 5.75 mm.

preferably, the total optical length TT L of the imaging optical lens is less than or equal to 5.49 mm.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.27.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.22.

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 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 imaging optical lens 10, fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, where the imaging optical lens 10 includes six lenses, specifically, the imaging optical lens 10 includes, in order from an object side to an image side, an aperture stop 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, and optical elements such as an optical filter GF (filter) may be disposed between the sixth lens L6 and an image plane Si.

the first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of glass, the fourth lens L4 is made of plastic, the fifth lens L5 is made of glass, and the sixth lens L6 is made of plastic.

the second lens element L2 with negative refractive power and the third lens element L3 with negative refractive power;

here, the focal length of the entire imaging optical lens 10 is defined as f, the focal length of the first lens element L1 is defined as f1, 0.5 f1/f 5 defines the positive refractive power of the first lens element L1, and when the lower limit value is exceeded, the lens is advantageous for the reduction in thickness, but the positive refractive power of the first lens element L1 is too strong to correct the aberration and the like, and is disadvantageous for the reduction in angle, whereas when the upper limit value is exceeded, the positive refractive power of the first lens element is too weak to reduce the thickness, and preferably 0.681 f1/f 3.116 is satisfied.

the refractive index of the third lens L3 is defined as n3, 1.7. ltoreq. n 3. ltoreq.2.2, and the refractive index of the third lens L3 is defined within the range, which is more advantageous for the development of ultra-thin lenses and correction of aberration, preferably, 1.779. ltoreq. n 3. ltoreq. 2.061 is satisfied.

the refractive index of the fifth lens L5 is defined as n5, 1.7. ltoreq. n 5. ltoreq.2.2, and the refractive index of the fifth lens L5 is defined within the range, which is more advantageous for the development of ultra-thinness and correction of aberration, preferably, 1.706. ltoreq. n 5. ltoreq.1.986 is satisfied.

the on-axis thickness of the second lens L2 is defined as d3, the optical total length of the shooting optical lens is TT L, d3/TT L is greater than or equal to 0.03 and less than or equal to 0.15, the ratio of the on-axis thickness of the 2 nd lens L2 to the optical total length TT L of the shooting optical lens 10 is specified, and therefore ultra-thinning is facilitated, and preferably, d3/TT L is greater than or equal to 0.036 and less than or equal to 0.099.

when the focal length of the image pickup optical lens 10, the focal length of each lens, the refractive index of the relevant lens, the optical total length of the image pickup optical lens, the on-axis thickness and the curvature radius satisfy the above relational expressions, the image pickup optical lens 10 can have high performance and satisfy the design requirement of low TT L.

in this embodiment, the object-side surface of the first lens element L1 is convex at the paraxial region, and the image-side surface thereof is concave at the paraxial region, and has positive refractive power.

the curvature radius of the object side surface of the first lens L1 is R1, the curvature radius of the image side surface of the first lens L1 is R2, the following relation is satisfied, the curvature radius is-3.55 ≦ (R1+ R2)/(R1-R2) ≦ -0.72, the shape of the first lens is reasonably controlled, so that the first lens can effectively correct the system spherical aberration, and the curvature radius is preferably-2.22 ≦ (R1+ R2)/(R1-R2) ≦ -0.90.

the on-axis thickness of the first lens L1 is d1, and the following relational expression that d1/TT L is more than or equal to 0.04 and less than or equal to 0.16 is satisfied, so that the ultra-thinning is favorably realized, and preferably, d1/TT L is more than or equal to 0.06 and less than or equal to 0.13.

in this embodiment, the object-side surface of the second lens element L2 is convex at the paraxial region, and the image-side surface is concave at the paraxial region.

the focal length of the whole photographic optical lens 10 is f, the focal length of the second lens L2 is f2, and the following relational expression of-20.8 ≦ f2/f ≦ -1.55 is satisfied, and the spherical aberration generated by the first lens L1 having positive power and the field curvature of the system are balanced reasonably and effectively by controlling the negative power of the second lens L2 within a reasonable range, preferably-13.00 ≦ f2/f ≦ -1.94.

the curvature radius of the object side surface of the second lens L2 is R3, the curvature radius of the image side surface of the second lens L2 is R4, the following relational expression is satisfied, 1.60 ≦ (R3+ R4)/(R3-R4) ≦ 19.96, the shape of the second lens L2 is defined, and the problem of chromatic aberration on the axis is hard to be corrected as the lens barrel progresses to an ultra-thin wide angle at the outside of the range, preferably 2.56 ≦ (R3+ R4)/(R3-R4) ≦ 15.97.

in this embodiment, the object-side surface of the third lens element L3 is concave in the paraxial region, and the image-side surface thereof is convex in the paraxial region;

the on-axis thickness of the third lens L3 is d5, and the following relational expression that d5/TT L is more than or equal to 0.02 and less than or equal to 0.07 is satisfied, so that the ultra-thinning is favorably realized, preferably, d5/TT L is more than or equal to 0.03 and less than or equal to 0.05.

the focal length of the whole pick-up optical lens 10 is f, the focal length f3 of the third lens L3 satisfies the following relational expression that-7.92 is equal to or more than f3/f is equal to or more than-1.21, which is beneficial to the system to obtain good ability of balancing curvature of field so as to effectively improve the image quality, preferably-4.95 is equal to or more than f3/f is equal to or more than-1.51.

the curvature radius of the object side surface of the third lens L3 is R5, the curvature radius of the image side surface of the third lens L3 is R6, and the following relational expression is satisfied, wherein the curvature radius is-4.99 (R5+ R6)/(R5-R6) is not more than-1.37, the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, and the generation of molding failure and stress caused by the excessive surface curvature of the third lens L3 is avoided, preferably, -3.12 (R5+ R6)/(R5-R6) is not more than-1.72.

in this embodiment, the object-side surface of the fourth lens element L4 is convex at the paraxial region, and the image-side surface thereof is convex at the paraxial region, and has positive refractive power.

the focal length of the whole shooting optical lens 10 is f, the focal length f4 of the fourth lens L4 meets the following relational expression that f4/f is more than or equal to 0.91 and less than or equal to 24.23, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power, preferably, f4/f is more than or equal to 1.45 and less than or equal to 19.38.

the radius of curvature R7 of the object-side surface of the fourth lens L4 and the radius of curvature R8 of the image-side surface of the fourth lens L4 satisfy the following relations of-12.96 ≦ (R7+ R8)/(R7-R8) ≦ -0.27, and the shape of the fourth lens L4 is specified, and when out of range, it is difficult to correct the off-axis aberration of the off-axis angle with the development of an ultra-thin wide angle, and it is preferable that-8.10 ≦ (R7+ R8)/(R7-R8) ≦ -0.34.

the on-axis thickness of the fourth lens L4 is d7, and the following relational expression that d7/TT L is more than or equal to 0.05 and less than or equal to 0.15 is satisfied, so that the ultra-thinning is favorably realized, and preferably, d7/TT L is more than or equal to 0.07 and less than or equal to 0.12.

in this embodiment, the object-side surface of the fifth lens element L5 is concave at the paraxial region and the image-side surface thereof is convex at the paraxial region, and has positive refractive power.

the focal length of the whole shooting optical lens 10 is f, the focal length of the fifth lens L5 is f5, the following relational expression is satisfied, f5/f is more than or equal to 0.32 and less than or equal to 1.29, the limitation to the fifth lens L5 can effectively lead the light angle of the shooting lens to be flat, and the tolerance sensitivity is reduced, preferably, f5/f is more than or equal to 0.51 and less than or equal to 1.03.

the radius of curvature of the object-side surface of the fifth lens L5 is R9, the radius of curvature of the image-side surface of the fifth lens L5 is R10, and the following relationships of 0.39. ltoreq. R9+ R10)/(R9-R10. ltoreq.1.60, and the shape of the fifth lens L5 are defined, and when the conditions are out of the range, it becomes difficult to correct the off-axis angular aberration due to the development of an ultra-thin wide angle, and the like, and preferably 0.63. ltoreq. R9+ R10)/(R9-R10. ltoreq.1.28.

the on-axis thickness of the fifth lens L5 is d9, and the following relational expression that d9/TT L is more than or equal to 0.05 and less than or equal to 0.18 is satisfied, so that the ultra-thinning is favorably realized, and preferably, d9/TT L is more than or equal to 0.08 and less than or equal to 0.14.

in this embodiment, the object-side surface of the sixth lens element L6 is concave in the paraxial region, and the image-side surface thereof is concave in the paraxial region, and has negative refractive power.

the focal length of the whole pick-up optical lens 10 is f, the focal length f6 of the sixth lens L6 meets the following relations that-1.24 ≦ f6/f ≦ -0.32, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power, preferably-0.77 ≦ f6/f ≦ -0.40.

the curvature radius of the object-side surface of the sixth lens L6 is R11, the curvature radius of the image-side surface of the sixth lens L6 is R12, and the following relational expressions of-1.26. ltoreq. (R11+ R12)/(R11-R12). ltoreq. -0.38, and the shape of the sixth lens L6 are defined, and when the conditions are out of the range, it is difficult to correct the off-axis angular aberration accompanying the development of an ultra-thin wide angle, and the like, and preferably, -0.79. ltoreq. (R11+ R12)/(R11-R12). ltoreq.0.47.

the on-axis thickness of the sixth lens L6 is d11, and the following relational expression that d11/TT L is more than or equal to 0.02 and less than or equal to 0.08 is satisfied, so that the ultra-thinning is favorably realized, preferably, d11/TT L is more than or equal to 0.04 and less than or equal to 0.06.

In this embodiment, the focal length of the image pickup optical lens is f, the combined focal length of the first lens element and the second lens element is f12, and the following relation is satisfied: f12/f is more than or equal to 0.61 and less than or equal to 2.01. Therefore, the aberration and distortion of the shooting optical lens can be eliminated, the back focal length of the shooting optical lens can be suppressed, and the miniaturization of the image lens system group is maintained. Preferably, 0.97. ltoreq. f 12/f. ltoreq.1.61.

in the present embodiment, the total optical length TT L of the imaging optical lens 10 is less than or equal to 5.75 mm, which is advantageous for achieving ultra-thinning, and preferably, the total optical length TT L of the imaging optical lens 10 is less than or equal to 5.49 mm.

In the present embodiment, the imaging optical lens 10 has a large aperture, and the F number of the aperture is 2.27 or less, which is excellent in image forming performance. Preferably, the F-number of the imaging optical lens 10 is 2.22 or less.

with such a design, the optical total length TT L 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.

TT L is the optical length (distance on the axis from the object side surface of the 1 st lens L1 to the imaging surface) in 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, 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 the object-side surface of the first lens L1;

R2 radius of curvature of the image-side surface of the first lens L1;

R3 radius of curvature of the object-side surface of the second lens L2;

R4 radius of curvature of the image-side surface of the second lens L2;

R5 radius of curvature of the object-side surface of the third lens L3;

R6 radius of curvature of the image-side surface of the third lens L3;

R7 radius of curvature of the object-side surface of the fourth lens L4;

R8 radius of curvature of the image-side surface of the fourth lens L4;

R9 radius of curvature of the object-side surface of the fifth lens L5;

R10 radius of curvature of the image-side surface of the fifth lens L5;

R11 radius of curvature of the object-side surface of the sixth lens L6;

R12 radius of curvature of the image-side surface of the sixth lens element L6;

R13 radius of curvature of the object side of the optical filter GF;

R14 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;

d0 on-axis distance from stop S1 to the object-side surface of the first lens L1;

d1 on-axis thickness of the first lens L1;

d2 on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3 on-axis thickness of the second lens L2;

d4 on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5 on-axis thickness of the third lens L3;

d6 on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7 on-axis thickness of the fourth lens L4;

d8 on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9 on-axis thickness of the fifth lens L5;

d10 on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

d11 on-axis thickness of the sixth lens L6;

d12 axial 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 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;

nd6, refractive index of d-line of the sixth lens L6;

ndg, refractive index of d-line of optical filter GF;

vd is Abbe number;

v1 Abbe number of the first lens L1;

v2 Abbe number of the second lens L2;

v3 Abbe number of the third lens L3;

v4 Abbe number of the fourth lens L4;

v5 Abbe number of the fifth lens L5;

v6 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 image pickup 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 the stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention, where P1R1 and P1R2 represent the object side surface and the image side surface of the first lens P1, respectively, 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, respectively, 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, respectively, and P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6, respectively, and the "inflection point position" field correspondence data indicates the vertical distance between the inflection point of each lens surface and the optical axis of the imaging optical lens 10.

[ TABLE 3 ]

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	0
			P2R1	0
P2R2	0
			P3R1	0
P3R2	1	1.055
			P4R1	1	0.665
P4R2	0
			P5R1	0
P5R2	0
			P6R1	0
P6R2	1	1.655

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470.0nm, 555.0nm, and 650.0nm, 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 555.0nm after passing through the imaging optical lens 10 according to the first embodiment, where S in fig. 4 is curvature of field in the sagittal direction, and T is curvature of field in the tangential direction.

Table 13 appearing later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1, 2, and 3.

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 1.848mm, a full field height of 3.918mm, a diagonal field angle of 88.37 °, a wide angle, 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.

Fig. 5 shows an imaging optical lens 20 according to a first embodiment of the present invention.

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 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	1	0.905
P1R2	1	0.425
					P2R1	0
P2R2	1	0.935
					P3R1	0
P3R2	1	0.665
					P4R1	3	0.255	1.035	1.215
P4R2	2	0.235	1.355
					P5R1	2	0.505	1.945
P5R2	2	1.295	1.675
					P6R1	1	1.595
P6R2	2	0.665	3.025

[ TABLE 8 ]

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470.0nm, 555.0nm, and 650.0nm, 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 555.0 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 1.942mm, a full field image height of 3.918mm, a diagonal field angle of 85.51 °, a wide angle, and a high profile, and has excellent optical characteristics with a sufficient correction of on-axis and off-axis chromatic aberration.

(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.

Fig. 9 shows an imaging optical lens 30 according to a first embodiment of the present invention.

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 ]

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	0
P1R2	1	0.565
			P2R1	0
P2R2	0
			P3R1	0
P3R2	1	0.905
			P4R1	1	0.535
P4R2	1	0.345
			P5R1	1	0.655
P5R2	0
			P6R1	0
P6R2	1	1.225

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 470.0nm, 555.0nm, and 650.0nm, 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 555.0nm 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 1.960mm, a full field height of 3.918mm, a diagonal field angle of 85.20 °, a wide angle, and a thin profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 13 ]

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

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, and a sixth lens; the first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with negative refractive power, the fourth lens element with positive refractive power, the fifth lens element with positive refractive power, and the sixth lens element with negative refractive power;

the focal length of the imaging optical lens is f, the focal length of the first lens is f1, 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 refractive index of the third lens is n3, the refractive index of the fifth lens is n5, the on-axis thickness of the second lens is d3, and the total optical length of the imaging optical lens is TT L, and the following relational expressions are satisfied:

0.5≤f1/f≤5；

1.7≤n3≤2.2；

1.7≤n5≤2.2；

-12.96≤(R7+R8)/(R7-R8)≤-0.27；

0.03≤d3/TTL≤0.15。

2. The imaging optical lens according to claim 1, wherein the imaging optical lens satisfies the following relational expression:

0.681≤f1/f≤3.116；

1.779≤n3≤2.061；

1.706≤n5≤1.986；

0.036≤d3/TTL≤0.099。

3. The image capturing optical lens assembly of claim 1, wherein 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:

-3.55≤(R1+R2)/(R1-R2)≤-0.72；

0.04≤d1/TTL≤0.16。

4. The imaging optical lens according to claim 3, characterized in that the imaging optical lens satisfies the following relation:

-2.22≤(R1+R2)/(R1-R2)≤-0.90；

0.06≤d1/TTL≤0.13。

5. The imaging optical lens assembly of claim 1, wherein the second lens element has a convex object-side surface and a concave image-side surface;

The focal length of the second lens is f2, the radius of curvature of the object side surface of the second lens is R3, the radius of curvature of the image side surface of the second lens is R4, and the following relations are satisfied:

-20.8≤f2/f≤-1.55；

1.60≤(R3+R4)/(R3-R4)≤19.96。

6. The imaging optical lens according to claim 5, characterized in that the imaging optical lens satisfies the following relation:

-13.00≤f2/f≤-1.94；

2.56≤(R3+R4)/(R3-R4)≤15.97。

7. The imaging optical lens assembly of claim 1, wherein the third lens element has a concave object-side surface and a convex image-side surface;

The third lens has a focal length of f3, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, an on-axis thickness of the third lens is d5, and the following relationships are satisfied:

-7.92≤f3/f≤-1.21；

-4.99≤(R5+R6)/(R5-R6)≤-1.37；

0.02≤d5/TTL≤0.07。

8. The image-pickup optical lens according to claim 7, wherein the image-pickup optical lens satisfies the following relation:

-4.95≤f3/f≤-1.51；

-3.12≤(R5+R6)/(R5-R6)≤-1.72；

0.03≤d5/TTL≤0.05。

9. The imaging optical lens of claim 1, wherein the fourth lens element with positive refractive power has a convex object-side surface at paraxial region;

The fourth lens has a focal length of f4, an on-axis thickness of d7, and satisfies the following relationship:

0.91≤f4/f≤24.23；

0.05≤d7/TTL≤0.15。

10. The image-pickup optical lens according to claim 9, wherein the image-pickup optical lens satisfies the following relation:

1.45≤f4/f≤19.38；

-8.10≤(R7+R8)/(R7-R8)≤-0.34；

0.07≤d7/TTL≤0.12。

11. The image capturing optical lens assembly according to claim 1, wherein the fifth lens element with positive refractive power has a convex image-side surface at paraxial region;

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 relational expression is satisfied:

0.32≤f5/f≤1.29；

0.39≤(R9+R10)/(R9-R10)≤1.60；

0.05≤d9/TTL≤0.18。

12. The image-pickup optical lens according to claim 11, wherein the image-pickup optical lens satisfies the following relationship:

0.51≤f5/f≤1.03；

0.63≤(R9+R10)/(R9-R10)≤1.28；

0.08≤d9/TTL≤0.14。

13. The image capturing optical lens assembly of claim 1, wherein the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface;

The sixth lens has a focal length f6, a radius of curvature of an object-side surface of the sixth lens is R11, a radius of curvature of an image-side surface of the sixth lens is R12, an on-axis thickness of the sixth lens is d11, and the following relationships are satisfied:

-1.24≤f6/f≤-0.32；

-1.26≤(R11+R12)/(R11-R12)≤-0.38；

0.02≤d11/TTL≤0.08。

14. The image-pickup optical lens according to claim 13, wherein the image-pickup optical lens satisfies the following relationship:

-0.77≤f6/f≤-0.40；

-0.79≤(R11+R12)/(R11-R12)≤-0.47；

0.04≤d11/TTL≤0.06。

15. The imaging optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied:

0.61≤f12/f≤2.01。

16. The image-pickup optical lens according to claim 15, wherein the image-pickup optical lens satisfies the following relation:

0.97≤f12/f≤1.61。

17. the image-taking optical lens according to claim 1, characterized in that an optical total length TT L of the image-taking optical lens is less than or equal to 5.75 mm.

18. the image-taking optical lens according to claim 17, characterized in that an optical total length TT L of the image-taking optical lens is less than or equal to 5.49 mm.

19. 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 2.27.

20. A camera optical lens according to claim 19, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.22.