CN111007651B

CN111007651B - Image pickup optical lens

Info

Publication number: CN111007651B
Application number: CN201911377282.6A
Authority: CN
Inventors: 寺西孝亮; 张磊; 崔元善
Original assignee: Chengrui Optics Changzhou Co Ltd
Current assignee: Chengrui Optics Changzhou Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-07-30
Anticipated expiration: 2039-12-27
Also published as: CN111007651A

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 negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with positive refractive power; and satisfies the following relationships: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; R1/R2 is more than or equal to-30.00 and less than or equal to-15.00; d4/d6 is more than or equal to 0.80 and less than or equal to 5.00. 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) 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 in a form of being excellent in function, light, thin, short and small, 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 conditions that the pixel area of the photosensitive device is continuously reduced and the requirements of the system on the imaging quality are continuously improved, five-piece and six-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 element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with positive refractive power; the imaging optical lens has a maximum field angle FOV, a curvature radius of the object-side surface of the first lens is R1, a curvature radius of the image-side surface of the first lens is R2, an on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, and an on-axis distance from the image-side surface of the third lens to the object-side surface of the fourth lens is d6, and the following relations are satisfied: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; R1/R2 is more than or equal to-30.00 and less than or equal to-15.00; d4/d6 is more than or equal to 0.80 and less than or equal to 5.00.

Preferably, the object-side surface of the first lens element is concave in the paraxial region, and the image-side surface thereof is concave in the paraxial region; the focal length of the image pickup optical lens is f, the focal length of the first lens is f1, the on-axis thickness of the first lens is d1, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f1/f is more than or equal to minus 5.87 and less than or equal to minus 1.22; (R1+ R2)/(R1-R2) is not more than 0.44 and not more than 1.40; d1/TTL is more than or equal to 0.02 and less than or equal to 0.17.

Preferably, the imaging optical lens satisfies the following relational expression: f1/f is not less than-3.67 and not more than-1.52; (R1+ R2)/(R1-R2) is not more than 0.70 and not more than 1.12; d1/TTL is more than or equal to 0.03 and less than or equal to 0.13.

Preferably, the focal length of the image capturing optical lens is f, the focal length of the second lens element is f2, the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, and the on-axis thickness of the second lens element is d3, the total optical length of the image capturing optical lens is TTL, and the following relationships are satisfied: f2/f is more than or equal to 4.65 and less than or equal to 15.86; (R3+ R4)/(R3-R4) is not more than 0.25 and not more than 252.73; d3/TTL is more than or equal to 0.03 and less than or equal to 0.14.

Preferably, the imaging optical lens satisfies the following relational expression: f2/f is more than or equal to 7.44 and less than or equal to 12.69; (R3+ R4)/(R3-R4) is not more than 0.40 and not more than 202.18; d3/TTL is more than or equal to 0.06 and less than or equal to 0.12.

Preferably, the object-side surface of the third lens element is convex in the paraxial region, and the image-side surface thereof is convex in the 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, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f3/f is more than or equal to 0.42 and less than or equal to 1.79; (R5+ R6)/(R5-R6) is not more than 0.04 and not more than 0.51; d5/TTL is more than or equal to 0.05 and less than or equal to 0.19.

Preferably, the imaging optical lens satisfies the following relational expression: f3/f is more than or equal to 0.66 and less than or equal to 1.43; (R5+ R6)/(R5-R6) is not more than 0.06 and not more than 0.41; d5/TTL is more than or equal to 0.08 and less than or equal to 0.16.

Preferably, the object-side surface of the fourth lens element is concave in the paraxial region, and the image-side surface thereof is convex in 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, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f4/f is more than or equal to 2.09 and less than or equal to 194.97; the ratio of (R7+ R8)/(R7-R8) is not more than 193.67 and not more than 1.57; d7/TTL is more than or equal to 0.02 and less than or equal to 0.12.

Preferably, the imaging optical lens satisfies the following relational expression: f4/f is not less than 3.34 and not more than 155.97; -121.04 (R7+ R8)/(R7-R8) is less than or equal to 1.26; d7/TTL is more than or equal to 0.03 and less than or equal to 0.10.

Preferably, the object side surface of the fifth lens is concave at the paraxial region; the focal length of the image pickup optical lens is f, the focal length of the fifth lens element is f5, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, and the on-axis thickness of the fifth lens element is d9, the total optical length of the image pickup optical lens is TTL, and the following relations are satisfied: f5/f is not less than 19.50 and not more than-1.59; -12.38 ≤ (R9+ R10)/(R9-R10) ≤ 0.36; d9/TTL is more than or equal to 0.02 and less than or equal to 0.14.

Preferably, the imaging optical lens satisfies the following relational expression: f5/f is more than or equal to-12.19 and less than or equal to-1.99; -7.73 ≤ (R9+ R10)/(R9-R10) ≤ 0.45; d9/TTL is more than or equal to 0.03 and less than or equal to 0.11.

Preferably, the object-side surface of the sixth 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 image pickup optical lens is f, the focal length of the sixth lens element is f6, the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius of the image-side surface of the sixth lens element is R12, and the on-axis thickness of the sixth lens element is d11, the total optical length of the image pickup optical lens is TTL, and the following relations are satisfied: f6/f is not less than 4.55 and not more than 416.16; (R11+ R12)/(R11-R12) is not more than 5.24 and not more than 19.80; d11/TTL is more than or equal to 0.03 and less than or equal to 0.23.

Preferably, the imaging optical lens satisfies the following relational expression: f6/f is not less than 7.28 and not more than 332.93; (R11+ R12)/(R11-R12) is not more than 8.38 and not more than 15.84; d11/TTL is more than or equal to 0.05 and less than or equal to 0.19.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 8.24 mm.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 7.86 millimeters.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.93.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.87.

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 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: the lens system comprises a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a stop S1, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power and a sixth lens element L6 with positive refractive power. An optical element such as an optical filter (filter) GF may be disposed on the image side of the sixth lens element L6.

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 plastic, and the sixth lens L6 is made of plastic.

The maximum field angle of the whole camera optical lens 10 is defined as FOV, FOV is not less than 100.00 degrees and not more than 135.00 degrees, the maximum field angle of the camera optical lens 10 is specified, ultra-wide-angle camera shooting can be realized within the range, and user experience is improved. Preferably, the FOV is 100.07 DEG.ltoreq. 134.42 deg.

The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2, -30.00-R1/R2-15.00 of the image side surface of the first lens L1 are defined, and the shape of the first lens L1 is defined, so that the problems of aberration and the like of off-axis picture angles can be favorably corrected along with the development of ultra-thin wide angles within a condition range. Preferably, it satisfies-29.75. ltoreq. R1/R2. ltoreq-15.01.

The axial distance between the image-side surface of the second lens L2 and the object-side surface of the third lens L3 is defined as d4, the axial distance between the image-side surface of the third lens L3 and the object-side surface of the fourth lens L4 is defined as d6, the axial distance between 0.80 and d4/d6 is defined as less than or equal to 5.00, and the ratio of the axial distance between the image-side surface of the second lens L2 and the object-side surface of the third lens L3 to the axial distance between the image-side surface of the third lens L3 and the object-side surface of the fourth lens L4 is defined, so that the lens angle is widened within the range. Preferably, 0.80. ltoreq. d4/d 6. ltoreq.4.97 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 the present embodiment, the object-side surface of the first lens element L1 is concave in the paraxial region, and the image-side surface thereof is concave in the paraxial region.

The focal length of the image pickup optical lens 10 is f, the focal length of the first lens is f1, and the following relation is satisfied: -5.87. ltoreq. f 1/f. ltoreq. 1.22, specifying the ratio of the focal length of the first lens L1 to the overall focal length. When the first lens element is within the specified range, the first lens element has appropriate negative refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens. Preferably, it satisfies-3.67. ltoreq. f 1/f. ltoreq-1.52.

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: 0.44 ≦ (R1+ R2)/(R1-R2) ≦ 1.40, and the shape of the first lens L1 is controlled appropriately so that the first lens L1 can effectively correct the system spherical aberration. Preferably, 0.70. ltoreq. (R1+ R2)/(R1-R2). ltoreq.1.12 is satisfied.

The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d1/TTL is more than or equal to 0.02 and less than or equal to 0.17, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 1/TTL. ltoreq.0.13.

The focal length f2 of the second lens L2 satisfies the following relation: 4.65 is less than or equal to f2/f is less than or equal to 15.86, 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, 7.44. ltoreq. f 2/f. ltoreq.12.69.

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, and the following relations are satisfied: the second lens L2 is defined in a shape of 0.25 ≦ (R3+ R4)/(R3-R4) ≦ 252.73, and is advantageous for correcting chromatic aberration on the axis as the lens is made to have a super-thin wide angle in the range. Preferably, 0.40 ≦ (R3+ R4)/(R3-R4). ltoreq. 202.18.

The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.03 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 3/TTL. ltoreq.0.12.

In this embodiment, the object-side surface of the third lens element L3 is convex at the paraxial region, and the image-side surface is convex at the paraxial region.

The focal length f3 of the third lens L3 satisfies the following relation: f3/f is more than or equal to 0.42 and less than or equal to 1.79, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.66. ltoreq. f 3/f. ltoreq.1.43.

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 (R5+ R6)/(R5-R6) is not more than 0.04 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, the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, and the aberration can be effectively reduced. Preferably, 0.06 ≦ (R5+ R6)/(R5-R6). ltoreq.0.41.

The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.05 and less than or equal to 0.19, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 5/TTL. ltoreq.0.16.

In this embodiment, the object-side surface of the fourth lens element L4 is concave in the paraxial region thereof, and the image-side surface thereof is convex in the paraxial region thereof.

The focal length of the fourth lens L4 is f4, and the following relationship is satisfied: 2.09 ≦ f4/f ≦ 194.97, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 3.34. ltoreq. f 4/f. ltoreq. 155.97.

The curvature radius R7 of the object side surface of the fourth lens L4 and the curvature radius R8 of the image side surface of the fourth lens L4 satisfy the following relations: -193.67 ≦ (R7+ R8)/(R7-R8) ≦ 1.57, and the shape of the fourth lens L4 is specified, and when the shape is within the range, problems such as aberration of the off-axis angle are easily corrected with the development of an ultra-thin wide angle. Preferably, -121.04 ≦ (R7+ R8)/(R7-R8). ltoreq.1.26.

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 0.12, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.10.

In the present embodiment, the object-side surface of the fifth lens L5 is concave in the paraxial region.

The focal length f5 of the fifth lens L5 satisfies the following relation: 19.50 is less than or equal to f5/f is less than or equal to-1.59, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, -12.19. ltoreq. f 5/f. ltoreq-1.99.

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: -12.38 ≦ (R9+ R10)/(R9-R10) ≦ -0.36, and the shape of the fifth lens L5 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, -7.73 ≦ (R9+ R10)/(R9-R10) ≦ -0.45.

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 convex at the paraxial region, and the image-side surface thereof is concave at the paraxial region.

The focal length f6 of the sixth lens L6 satisfies the following relation: 4.55 ≦ f6/f ≦ 416.16, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 7.28. ltoreq. f 6/f. ltoreq. 332.93.

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: 5.24 ≦ (R11+ R12)/(R11-R12) ≦ 19.80, 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 view angle and the like as the ultra-thin wide angle progresses. Preferably, 8.38 ≦ (R11+ R12)/(R11-R12). ltoreq.15.84.

The on-axis thickness of the sixth lens L6 is d11, and satisfies the following relation: d11/TTL is more than or equal to 0.03 and less than or equal to 0.23, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 11/TTL. ltoreq.0.19.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 8.24 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image-taking optical lens 10 is less than or equal to 7.86 millimeters.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.93 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 2.87 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.

In this embodiment, the focal length of the image pickup optical lens 10 is f, the combined focal length of the first lens L1 and the second lens L2 is f12, and the following relationship is satisfied: f12/f is more than or equal to-8.88 and less than or equal to-1.36. 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, -5.55. ltoreq. f 12/f. ltoreq-1.70.

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 (on-axis distance from the object side surface of the first lens L1 to the image plane) in units of 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 the meanings of the symbols are as follows:

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.

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, G3R1 and G3R2 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 reverse curvature 1	Position of reverse curvature 2
				P1R1	2	0.215	1.745
P1R2	1	1.235
				P2R1	0
P2R2	0
				G3R1	0
G3R2	0
				P4R1	2	0.085	0.665
P4R2	0
				P5R1	0
P5R2	2	0.705	1.675
				P6R1	1	0.655
P6R2	1	0.855

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	0.365
P1R2	0
				P2R1	0
P2R2	0
				G3R1	0
G3R2	0
				P4R1	2	0.145	0.905
P4R2	0
				P5R1	0
P5R2	1	1.035
				P6R1	1	1.215
P6R2	1	1.825

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 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 1.250mm, a full field image height of 3.25mm, a maximum field angle of 100.14 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its 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 symbols are used as in the first embodiment, and only the differences are listed below:

in this embodiment, the first lens L1 is made of plastic, 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, and the sixth lens L6 is made of plastic.

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 ]

Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients.

y＝(x²/R)/[1+{1-(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶+A18x¹⁸+A20x²⁰ (2)

For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (2). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (2).

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. P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, respectively.

[ TABLE 7 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	1	0.235
P1R2	0
					P2R1	1	0.205
P2R2	1	0.335
					P3R1	1	0.505
P3R2	0
					P4R1	1	0.915
P4R2	3	0.175	0.305	1.085
					P5R1	2	0.165	0.435
P5R2	3	0.955	1.315	1.465
					P6R1	2	0.445	1.435
P6R2	2	0.555	2.615

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	0.395
P1R2	0
				P2R1	1	0.345
P2R2	1	0.595
				P3R1	0
P3R2	0
				P4R1	0
P4R2	0
				P5R1	2	0.375	0.475
P5R2	0
				P6R1	1	0.865
P6R2	1	1.505

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 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 0.832mm, a full field image height of 3.25mm, a maximum field angle of 120.28 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its on-axis and off-axis chromatic aberration sufficiently corrected.

(third embodiment)

The third embodiment is basically the same as the second embodiment, the same reference numerals as in the second 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 ]

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2	Location of stagnation 3	Location of stagnation 4
						P1R1	1	0.375
P1R2	0
						P2R1	0
P2R2	1	0.525
						P3R1	0
P3R2	0
						P4R1	0
P4R2	1	1.055
						P5R1	4	0.305	0.655	0.845	0.965
P5R2	0
						P6R1	2	0.885	2.255
P6R2	1	1.575

Fig. 10 and 11 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 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 0.644mm, a full field image height of 3.25mm, a maximum field angle of 133.83 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 13 ]

FNO is the number of apertures F of the imaging optical lens.

f12 denotes a combined focal length of the first lens L1 and the second lens L2.

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 includes six lenses, in order from an object side to an image side: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with positive refractive power;

the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the maximum field angle of the image pickup optical lens is FOV, the curvature radius of the object-side surface of the first lens is R1, the curvature radius of the image-side surface of the first lens is R2, the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, and the on-axis distance from the image-side surface of the third lens to the object-side surface of the fourth lens is d6, and the following relations are satisfied:

3.34≤f4/f≤155.97；

100.00°≤FOV≤135.00°；

-30.00≤R1/R2≤-15.00；

0.80≤d4/d6≤5.00。

2. the imaging optical lens of claim 1, wherein the object-side surface of the first lens element is concave in the paraxial region and the image-side surface thereof is concave in the paraxial region;

the focal length of the first lens is f1, the on-axis thickness of the first lens is d1, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:

-5.87≤f1/f≤-1.22；

0.44≤(R1+R2)/(R1-R2)≤1.40；

0.02≤d1/TTL≤0.17。

3. the imaging optical lens according to claim 2, wherein the imaging optical lens satisfies the following relationship:

-3.67≤f1/f≤-1.52；

0.70≤(R1+R2)/(R1-R2)≤1.12；

0.03≤d1/TTL≤0.13。

4. the imaging optical lens of claim 1, wherein 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 on-axis thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

4.65≤f2/f≤15.86；

0.25≤(R3+R4)/(R3-R4)≤252.73；

0.03≤d3/TTL≤0.14。

5. the imaging optical lens according to claim 4, wherein the imaging optical lens satisfies the following relation:

7.44≤f2/f≤12.69；

0.40≤(R3+R4)/(R3-R4)≤202.18；

0.06≤d3/TTL≤0.12。

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

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, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:

0.42≤f3/f≤1.79；

0.04≤(R5+R6)/(R5-R6)≤0.51；

0.05≤d5/TTL≤0.19。

7. the imaging optical lens according to claim 6, wherein the imaging optical lens satisfies the following relation:

0.66≤f3/f≤1.43；

0.06≤(R5+R6)/(R5-R6)≤0.41；

0.08≤d5/TTL≤0.16。

8. the imaging optical lens of claim 1, wherein the fourth lens element has a concave object-side surface and a convex image-side surface;

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, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:

-193.67≤(R7+R8)/(R7-R8)≤1.57；

0.02≤d7/TTL≤0.12。

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

-121.04≤(R7+R8)/(R7-R8)≤1.26；

0.03≤d7/TTL≤0.10。

10. the imaging optical lens according to claim 1, wherein an object side surface of the fifth lens element is concave in a paraxial direction;

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, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:

-19.50≤f5/f≤-1.59；

-12.38≤(R9+R10)/(R9-R10)≤-0.36；

0.02≤d9/TTL≤0.14。

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

-12.19≤f5/f≤-1.99；

-7.73≤(R9+R10)/(R9-R10)≤-0.45；

0.03≤d9/TTL≤0.11。

12. the imaging optical lens of claim 1, wherein the sixth lens element has a convex object-side surface and a concave image-side surface;

the focal length of the sixth lens element is f6, the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius 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 total optical length of the imaging optical lens assembly is TTL and satisfies the following relation:

4.55≤f6/f≤416.16；

5.24≤(R11+R12)/(R11-R12)≤19.80；

0.03≤d11/TTL≤0.23。

13. the image-pickup optical lens according to claim 12, wherein the image-pickup optical lens satisfies the following relation:

7.28≤f6/f≤332.93；

8.38≤(R11+R12)/(R11-R12)≤15.84；

0.05≤d11/TTL≤0.19。

14. 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 8.24 mm.

15. A camera optical lens according to claim 14, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 7.86 mm.

16. 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 2.93.

17. A camera optical lens according to claim 16, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.87.