CN111025548B

CN111025548B - Image pickup optical lens

Info

Publication number: CN111025548B
Application number: CN201911335884.5A
Authority: CN
Inventors: 司丛芳
Original assignee: Chengrui Optics Changzhou Co Ltd
Current assignee: Chengrui Optics Changzhou Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2021-09-24
Anticipated expiration: 2039-12-23
Also published as: CN111025548A

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element, a fifth lens element, a sixth lens element with positive refractive power, and a seventh lens element with negative refractive power; and satisfies the following relationships: d2/d4 is more than or equal to 4.00 and less than or equal to 10.00; d12/d13 is more than or equal to 0.00 and less than or equal to 0.30; f3/f is not less than 4.00 and not more than-1.00; 1.00-5.00 (R3+ R4)/(R3-R4). The imaging optical lens of the invention has good optical performance such as large aperture, wide angle, ultra-thin and the like.

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 three-piece, four-piece, or even five-piece or six-piece lens structures. However, with the development of technology and the increasing demand of diversified users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system for the imaging quality is continuously improved, the seven-piece lens structure gradually appears in the lens design, although the common seven-piece lens has good optical performance, the focal power, the lens pitch and the lens shape setting still have certain irrationality, so that the design requirements of large aperture, ultra-thinning and wide-angle cannot be met while the lens structure has good optical performance.

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

the focal length of the imaging optical lens is f, the focal length of the third lens is f3, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, the on-axis distance from the image-side surface of the sixth lens to the object-side surface of the seventh lens is d12, the on-axis thickness of the seventh lens is d13, 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, and the following relations are satisfied: d2/d4 is more than or equal to 4.00 and less than or equal to 10.00; d12/d13 is more than or equal to 0.00 and less than or equal to 0.30; f3/f is not less than 4.00 and not more than-1.00; 1.00-5.00 (R3+ R4)/(R3-R4).

Preferably, the focal length of the second lens is f2, and the following relation is satisfied: f2/f is more than or equal to 1.00 and less than or equal to 5.00.

Preferably, the focal length of the first lens element is f1, the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied: f1/f is more than or equal to 0.93 and less than or equal to 3.29; -5.82 ≤ (R1+ R2)/(R1-R2) ≤ 1.20; d1/TTL is more than or equal to 0.03 and less than or equal to 0.11.

Preferably, the on-axis thickness of the second lens is d3, the total optical length of the image pickup optical lens is TTL, and the following relation is satisfied: d3/TTL is more than or equal to 0.03 and less than or equal to 0.13.

Preferably, the curvature radius of the object-side surface of the third lens element is R5, the curvature radius of the image-side surface of the third lens element is R6, the on-axis thickness of the third lens element is d5, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship: -0.68 ≤ (R5+ R6)/(R5-R6) 2.01; d5/TTL is more than or equal to 0.02 and less than or equal to 0.07.

Preferably, 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, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied: 39.54 ≦ f4/f ≦ 59.42; -25.41 (R7+ R8)/(R7-R8) is less than or equal to-0.66; d7/TTL is more than or equal to 0.02 and less than or equal to 0.07.

Preferably, 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, 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 relationships are satisfied: -254.21 ≤ f5/f ≤ 9.30; (R9+ R10)/(R9-R10) is less than or equal to 30.37; d9/TTL is more than or equal to 0.05 and less than or equal to 0.21.

Preferably, 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, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f6/f is more than or equal to 0.39 and less than or equal to 2.20; (R11+ R12)/(R11-R12) is not more than 0.07 but not more than 1.01; d11/TTL is more than or equal to 0.04 and less than or equal to 0.22.

Preferably, the focal length of the seventh lens element is f7, the radius of curvature of the object-side surface of the seventh lens element is R13, the radius of curvature of the image-side surface of the seventh lens element is R14, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f7/f is not less than 2.49 and not more than-0.61; 1.46-5.26 of (R13+ R14)/(R13-R14); d13/TTL is more than or equal to 0.04 and less than or equal to 0.19.

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 0.37 and less than or equal to 2.25.

The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical performance, has characteristics of a large aperture, a wide angle of view, and an ultra-thin profile, and is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are constituted by high-pixel imaging elements such as CCDs and CMOSs.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

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 of FIG. 9;

fig. 13 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment of the present invention;

fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;

fig. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 13;

fig. 16 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 13;

fig. 17 is a schematic configuration diagram of an imaging optical lens according to a fifth embodiment of the present invention;

fig. 18 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 17;

fig. 19 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 17;

fig. 20 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 17;

fig. 21 is a schematic configuration diagram of an imaging optical lens according to a sixth embodiment of the present invention;

fig. 22 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 21;

fig. 23 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 21;

fig. 24 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 21.

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: the third lens element comprises a first lens element L1 with positive refractive power, a stop S1, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 with positive refractive power, and a seventh lens element L7 with negative refractive power. An optical element such as an optical filter (filter) GF may be disposed between the seventh lens L7 and the image plane Si.

Defining an on-axis distance d2 from an image-side surface of the first lens L1 to an object-side surface of the second lens L2, and an on-axis distance d4 from an image-side surface of the second lens L2 to an object-side surface of the third lens L3, the following relations are satisfied: 4.00-d 2/d 4-10.00, when d2/d4 meets the condition, the thicknesses of the first lens and the second lens can be effectively distributed, and lens processing and lens assembly are facilitated.

Defining an on-axis distance d12 from an image-side surface of the sixth lens L6 to an object-side surface of the seventh lens L7, an on-axis thickness d13 of the seventh lens L7, the following relationship is satisfied: d12/d13 is more than or equal to 0.00 and less than or equal to 0.30, and when d12/d13 meets the condition, the total length of the system can be effectively compressed, and the ultra-thinning of the system is facilitated.

Defining the focal length f of the entire image pickup optical lens 10 and the focal length f3 of the third lens L3, the following relations are satisfied: f3/f is more than or equal to 4.00 and less than or equal to-1.00, and the ratio of the focal length of the third lens to the total focal length is specified, so that the conditional expression range is favorable for balancing aberration and improving the imaging quality.

The curvature radius of the object side surface of the second lens L2 is defined as R3, the curvature radius of the image side surface of the second lens L2 is defined as R4, and the following relational expressions are satisfied: 1.00-5.00 (R3+ R4)/(R3-R4), and the shape of the second lens can alleviate the deflection degree of light rays passing through the lens within the range specified by the conditional expression, thereby effectively reducing aberration.

Defining the focal length f of the entire image pickup optical lens 10 and the focal length f2 of the second lens L2, the following relations are satisfied: f2/f is more than or equal to 1.00 and less than or equal to 5.00, when f2/f meets the condition, the focal power of the second lens can be reasonably distributed, the aberration of the optical system is corrected, and the imaging quality is improved.

Defining the focal length f of the entire image pickup optical lens 10 and the focal length f1 of the first lens L1, the following relations are satisfied: f1/f is more than or equal to 0.93 and less than or equal to 3.29, and the ratio of the positive refractive power to the overall focal length of the first lens element L1 is defined. When the first lens element is within the specified range, the first lens element has proper positive refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens. Preferably, 1.49. ltoreq. f 1/f. ltoreq.2.63 is satisfied.

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, and the following relational expression is satisfied: -5.82 ≦ (R1+ R2)/(R1-R2) ≦ -1.20, and the shape of the first lens L1 is controlled appropriately so that the first lens L1 can correct the system spherical aberration effectively. Preferably, it satisfies-3.64 ≦ (R1+ R2)/(R1-R2). ltoreq.1.50.

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 relationship is satisfied: d1/TTL is more than or equal to 0.03 and less than or equal to 0.11, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.05. ltoreq. d 1/TTL. ltoreq.0.08 is satisfied.

Defining the on-axis thickness of the second lens L2 as d3, the total optical length of the image pickup optical lens 10 as TTL, and satisfying the following relation: d3/TTL is more than or equal to 0.03 and less than or equal to 0.13, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.05. ltoreq. d 3/TTL. ltoreq.0.10 is satisfied.

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 are defined, and the following relations are satisfied: 0.68-2.01 (R5+ R6)/(R5-R6), which is favorable for the molding of the third lens L3, and can alleviate the deflection degree of the light rays passing through the lens and effectively reduce the aberration. Preferably, it satisfies-0.42 ≦ (R5+ R6)/(R5-R6). ltoreq.1.61.

The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d5/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.03. ltoreq. d 5/TTL. ltoreq.0.05 is satisfied.

Defining the focal length f of the entire image pickup optical lens 10 and the focal length f4 of the fourth lens L4, the following relations are satisfied: 39.54 ≦ f4/f ≦ 59.42, which specifies the ratio of the focal length of the fourth lens to the focal length of the system, and contributes to the improvement of the optical system performance within the conditional range. Preferably, it satisfies-24.71. ltoreq. f 4/f. ltoreq.47.54.

The curvature radius of the object side surface of the fourth lens L4 is R7, the curvature radius of the image side surface of the fourth lens L4 is R8, and the following relational expression is satisfied: the value of (R7+ R8)/(R7-R8) is not more than-1.85 in the range of-25.41, and the shape of the fourth lens L4 is defined, so that the problem of aberration of the off-axis angle is favorably corrected with the development of an ultra-thin wide angle in the range. Preferably, it satisfies-15.88 ≦ (R7+ R8)/(R7-R8) ≦ -0.83.

The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.05 is satisfied.

Defining the focal length f of the image pickup optical lens 10 and the focal length f5 of the fifth lens L5, the following relations are satisfied: f5/f 9.30 is more than or equal to-254.21 and less than or equal to 9.30, and the definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, it satisfies-158.88 ≦ f5/f ≦ 7.44.

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 relation: (R9+ R10)/(R9-R10) is not more than-8.85, the shape of the fifth lens L5 is specified, and the problems of aberration of off-axis picture angle and the like are favorably corrected along with the development of ultra-thin wide-angle under the condition range. Preferably, the (R9+ R10)/(R9-R10) ≦ 24.30.

The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d9/TTL is more than or equal to 0.05 and less than or equal to 0.21, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.08. ltoreq. d 9/TTL. ltoreq.0.16 is satisfied.

Defining the focal length f of the image pickup optical lens 10 and the focal length f6 of the sixth lens L6, the following relations are satisfied: 0.39 ≦ f6/f ≦ 2.20, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power within the conditional range. Preferably, it is 0.62. ltoreq. f 6/f. ltoreq.1.72.

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 expression is satisfied: the (R11+ R12)/(R11-R12) is 0.07-1.01, defines the shape of the sixth lens L6, and is advantageous for correcting the aberration of the off-axis picture angle and the like as the ultra-thin wide angle is developed within the range. Preferably, 0.11. ltoreq. R11+ R12)/(R11-R12. ltoreq.0.81 is satisfied.

The on-axis thickness of the sixth lens element L6 is d11, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d11/TTL is more than or equal to 0.04 and less than or equal to 0.22, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 11/TTL. ltoreq.0.17 is satisfied.

Defining the focal length of the image pickup optical lens 10 as f, and the focal length of the seventh lens L7 as f7, the following relations are satisfied: -2.49 ≦ f7/f ≦ -0.61, and the system has better imaging quality and lower sensitivity through reasonable distribution of power within the conditional range. Preferably, it satisfies-1.56. ltoreq. f 7/f. ltoreq-0.76.

The curvature radius of the object side surface of the seventh lens L7 is R13, the curvature radius of the image side surface of the seventh lens L7 is R14, and the following relational expression is satisfied: 1.46 ≦ (R13+ R14)/(R13-R14) ≦ 5.26, and the shape of the seventh lens L7 is specified, and when the conditions are within the range, it is advantageous to correct the problems such as off-axis picture angle aberration with the development of ultra-thin wide-angle. Preferably, 2.34. ltoreq. (R13+ R14)/(R13-R14). ltoreq.4.21 is satisfied.

The on-axis thickness of the seventh lens L7 is d13, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d13/TTL is more than or equal to 0.04 and less than or equal to 0.19, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.06. ltoreq. d 13/TTL. ltoreq.0.16 is satisfied.

In the present embodiment, the image height of the entire imaging optical lens 10 is IH, and the total optical length of the imaging optical lens 10 is TTL, and the following conditional expressions are satisfied: TTL/IH is less than or equal to 1.35, thereby realizing ultra-thinning.

In the present embodiment, the number of apertures FNO of the imaging optical lens 10 is 1.90 or less. The large aperture is large, and the imaging performance is good.

In the present embodiment, the wide-angle FOV of the imaging optical lens 10 is equal to or greater than 100 °. Wide-angle performance is achieved.

In the present embodiment, the focal length of the imaging optical lens 10 is f, and the combined focal length of the first lens L1 and the second lens L2 is f12, which satisfy the following relation: f12/f is more than or equal to 0.37 and less than or equal to 2.25, and within the range of the conditional expression, the aberration and distortion of the image pickup optical lens 10 can be eliminated, and the back focal length of the image pickup optical lens 10 can be suppressed, so as to keep the miniaturization of the image lens system. Preferably, 0.59. ltoreq. f 12/f. ltoreq.1.80 is satisfied.

When the focal length of the image pickup optical lens 10, the focal length of each lens and the curvature radius satisfy the above relational expression, the image pickup optical lens 10 can have good optical performance, and design requirements of a large aperture, a wide angle and ultra-thinness can be satisfied; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.

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 each symbol has the following meaning.

S1: an aperture;

r: the radius of curvature of the optical surface and the radius of curvature of the lens as the center;

r1: the radius of curvature of the object-side surface of the first lens L1;

r2: the radius of curvature of the image-side surface of the first lens L1;

r3: the radius of curvature of the object-side surface of the second lens L2;

r4: the radius of curvature of the image-side surface of the second lens L2;

r5: the radius of curvature of the object-side surface of the third lens L3;

r6: the radius of curvature of the image-side surface of the third lens L3;

r7: the radius of curvature of the object-side surface of the fourth lens L4;

r8: the radius of curvature of the image-side surface of the fourth lens L4;

r9: a radius of curvature of the object side surface of the fifth lens L5;

r10: a radius of curvature of the image-side surface of the fifth lens L5;

r11: a radius of curvature of the object side surface of the sixth lens L6;

r12: a radius of curvature of the image-side surface of the sixth lens L6;

r13: a radius of curvature of the object side surface of the seventh lens L7;

r14: a 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: 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: 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: 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;

nd 7: the refractive index of the d-line of the seventh lens L7;

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;

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 the first embodiment of the present invention.

[ TABLE 2 ]

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

IH: image height

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

For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).

Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, and P7R1 and P7R2 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 ]

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	1.105
				P2R1	0
P2R2	0
				P3R1	0
P3R2	1	0.785
				P4R1	1	0.555
P4R2	1	0.495
				P5R1	0
P5R2	0
				P6R1	1	2.115
P6R2	2	0.685	2.715
				P7R1	1	2.165
P7R2	1	2.615

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, 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.

The following table 25 shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1, 2, 3, 4, 5, and 6.

As shown in table 25, the first embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.389mm, a full field height of 5.146mm, a diagonal field angle of 100.13 °, 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.

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	0.985
P1R2	1	0.745
					P2R1	0
P2R2	0
					P3R1	1	0.125
P3R2	2	0.475	1.605
					P4R1	1	0.295
P4R2	3	0.345	1.585	1.805
					P5R1	2	1.365	1.925
P5R2	2	1.535	2.125
					P6R1	2	1.435	3.005
P6R2	3	0.355	1.735	3.765
					P7R1	2	1.025	3.815
P7R2	2	0.975	4.445

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	1.125
				P2R1	0
P2R2	0
				P3R1	1	0.205
P3R2	1	0.805
				P4R1	1	0.495
P4R2	1	0.555
				P5R1	0
P5R2	0
				P6R1	1	2.165
P6R2	2	0.685	2.655
				P7R1	1	2.145
P7R2	1	2.625

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm 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 25, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.367mm, a full field image height of 5.146mm, a diagonal field angle of 100.40 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(third embodiment)

The third embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.

Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.

[ TABLE 9 ]

Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[ TABLE 10 ]

Tables 11 and 12 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[ TABLE 11 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	1	1.035
P1R2	1	0.765
					P2R1	0
P2R2	0
					P3R1	0
P3R2	1	0.455
					P4R1	1	0.355
P4R2	2	0.315	1.575
					P5R1	1	1.355
P5R2	2	1.525	2.175
					P6R1	2	1.425	2.895
P6R2	3	0.415	1.685	3.415
					P7R1	3	0.945	3.315	3.485
P7R2	2	0.975	4.185

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	1.135
				P2R1	0
P2R2	0
				P3R1	0
P3R2	1	0.785
				P4R1	1	0.585
P4R2	1	0.515
				P5R1	1	1.945
P5R2	0
				P6R1	1	2.055
P6R2	2	0.805	2.375
				P7R1	1	2.005
P7R2	1	2.675

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm 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 25 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 2.401mm, a full field height of 5.146mm, a diagonal field angle of 100.14 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(fourth embodiment)

The fourth embodiment is basically the same as the first embodiment, and the same reference numerals as in the first embodiment, and only different points will be described below.

Tables 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

[ TABLE 13 ]

Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[ TABLE 14 ]

Tables 15 and 16 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[ TABLE 15 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	1	1.055
P1R2	1	0.755
					P2R1	0
P2R2	0
					P3R1	0
P3R2	1	0.295
					P4R1	1	1.515
P4R2	1	1.635
					P5R1	2	1.415	1.965
P5R2	1	1.535
					P6R1	3	1.685	3.245	3.795
P6R2	3	0.365	1.825	3.825
					P7R1	1	1.035
P7R2	1	1.005

[ TABLE 16 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	1.115
				P2R1	0
P2R2	0
				P3R1	0
P3R2	1	0.525
				P4R1	0
P4R2	0
				P5R1	0
P5R2	0
				P6R1	2	2.605	3.745
P6R2	2	0.715	2.795
				P7R1	1	2.145
P7R2	1	2.745

Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 40 according to the fourth embodiment.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.294mm, a full field height of 5.146mm, a diagonal field angle of 100.35 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(fifth embodiment)

The fifth 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 17 and 18 show design data of the imaging optical lens 50 according to the fifth embodiment of the present invention.

[ TABLE 17 ]

Table 18 shows aspherical surface data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[ TABLE 18 ]

Tables 19 and 20 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[ TABLE 19 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	1	1.065
P1R2	1	0.765
					P2R1	0
P2R2	0
					P3R1	0
P3R2	1	0.415
					P4R1	1	0.375
P4R2	2	1.555	1.835
					P5R1	2	1.315	1.925
P5R2	2	1.515	2.145
					P6R1	2	1.395	2.925
P6R2	3	0.385	1.725	3.815
					P7R1	2	0.925	3.625
P7R2	2	0.925	4.135

[ TABLE 20 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	1.125
				P2R1	0
P2R2	0
				P3R1	0
P3R2	1	0.775
				P4R1	1	0.635
P4R2	0
				P5R1	0
P5R2	0
				P6R1	1	2.075
P6R2	2	0.745	2.515
				P7R1	1	2.005
P7R2	2	2.555	4.525

Fig. 18 and 19 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 50 according to the fifth embodiment. Fig. 20 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 50 according to the fifth embodiment.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.388mm, a full field height of 5.146mm, a diagonal field angle of 100.09 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(sixth embodiment)

The sixth embodiment is basically the same as the first embodiment, and the same reference numerals as in the first embodiment, and only different points will be described below.

Tables 21 and 22 show design data of the imaging optical lens 60 according to the sixth embodiment of the present invention.

[ TABLE 21 ]

Table 22 shows aspherical surface data of each lens in the imaging optical lens 60 according to the sixth embodiment of the present invention.

[ TABLE 22 ]

Tables 23 and 24 show the inflection points and stagnation point design data of each lens in the imaging optical lens 60 according to the sixth embodiment of the present invention.

[ TABLE 23 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2	Position of reverse curvature 3
					P1R1	2	0.955	1.375
P1R2	2	0.595	1.195
					P2R1	1	1.085
P2R2	0
					P3R1	0
P3R2	1	0.325
					P4R1	1	0.415
P4R2	2	0.465	1.675
					P5R1	1	1.365
P5R2	1	1.725
					P6R1	3	1.645	3.035	3.425
P6R2	3	0.565	1.785	3.565
					P7R1	3	0.885	3.385	3.515
P7R2	3	0.945	4.245	4.395

[ TABLE 20 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	1	0.925
				P2R1	0
P2R2	0
				P3R1	0
P3R2	1	0.635
				P4R1	1	0.785
P4R2	1	0.855
				P5R1	0
P5R2	0
				P6R1	1	2.285
P6R2	2	1.155	2.335
				P7R1	1	1.725
P7R2	1	2.695

Fig. 22 and 23 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 60 according to the sixth embodiment. Fig. 24 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 60 according to the sixth embodiment.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.223mm, a full field height of 5.146mm, a diagonal field angle of 100.09 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 25 ]

Parameter and condition formula	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6
							d2/d4	5.85	4.00	9.92	9.92	9.98	9.89
d12/d13	0.19	0.18	0.03	0.30	0.15	0.05
							f3/f	-2.07	-3.99	-2.20	-3.99	-1.00	-3.74
(R3+R4)/(R3-R4)	1.10	1.08	1.14	2.00	1.19	4.90
							f	4.419	4.379	4.441	4.244	4.418	4.113
f1	9.096	9.614	8.870	8.654	8.249	8.020
							f2	6.539	8.757	6.859	8.487	4.418	21.338
f3	-9.147	-17.469	-9.783	-16.932	-4.423	-15.384
							f4	42.849	173.465	32.436	-83.906	13.109	21.282
f5	25.629	27.164	-564.484	12.789	18.111	-52.553
							f6	5.644	5.113	5.546	5.702	6.476	3.212
f7	-4.730	-4.596	-5.533	-4.632	-4.682	-3.742
							f12	4.199	4.962	4.278	4.690	3.267	6.156
Fno	1.85	1.85	1.85	1.85	1.85	1.85

Where Fno is the F-number of the diaphragm of the imaging optical lens.

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, comprising seven lens elements in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element, a fifth lens element, a sixth lens element with positive refractive power, and a seventh lens element with negative refractive power;

the imaging optical lens system comprises an imaging optical lens, a third lens, a first lens, a second lens, a third lens and a sixth lens, wherein the imaging optical lens system comprises an imaging optical lens, the third lens and the sixth lens, the imaging optical lens system comprises a focal length f, a focal length f3, an on-axis distance from an image side surface of the first lens to an object side surface of the second lens is d2, an on-axis distance from an image side surface of the second lens to an object side surface of the third lens is d4, an on-axis distance from an image side surface of the sixth lens to an object side surface of the seventh lens is d12, an on-axis thickness of the seventh lens is d13, a curvature radius of an object side surface of the second lens is R3, a curvature radius of an image side surface of the second lens is R4, a curvature radius of an object side surface of the third lens is R5, a curvature radius of an image side surface of the third lens is R6, and the following relational expressions are satisfied:

4.00≤d2/d4≤10.00；

0.00≤d12/d13≤0.30；

-4.00≤f3/f≤-1.00；

1.00≤(R3+R4)/(R3-R4)≤5.00；

-0.68≤(R5+R6)/(R5-R6)≤2.01。

2. the imaging optical lens according to claim 1, wherein the second lens has a focal length f2 and satisfies the following relationship:

1.00≤f2/f≤5.00。

3. the imaging optical lens of claim 1, wherein the first lens has a focal length of f1, a radius of curvature of an object-side surface of the first lens is R1, a radius of curvature of an image-side surface of the first lens is R2, an on-axis thickness of the first lens is d1, and an optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:

0.93≤f1/f≤3.29；

-5.82≤(R1+R2)/(R1-R2)≤-1.20；

0.03≤d1/TTL≤0.11。

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

0.03≤d3/TTL≤0.13。

5. a photographic optical lens according to claim 1, wherein the on-axis thickness of the third lens element is d5, the total optical length of the photographic optical lens is TTL, and the following relationship is satisfied:

0.02≤d5/TTL≤0.07。

6. the image-capturing optical lens unit according to claim 1, wherein the fourth lens element has a focal length f4, a radius of curvature of an object-side surface of the fourth lens element is R7, a radius of curvature of an image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:

-39.54≤f4/f≤59.42；

-25.41≤(R7+R8)/(R7-R8)≤-0.66；

0.02≤d7/TTL≤0.07。

7. the image-capturing optical lens unit according to claim 1, wherein the fifth lens element has a focal length f5, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, an on-axis thickness of the fifth lens element is d9, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:

-254.21≤f5/f≤9.30；

(R9+R10)/(R9-R10)≤30.37；

0.05≤d9/TTL≤0.21。

8. the image-capturing optical lens unit according to claim 1, wherein the sixth lens element has a focal length f6, a radius of curvature of an object-side surface of the sixth lens element is R11, a radius of curvature of an image-side surface of the sixth lens element is R12, an on-axis thickness of the sixth lens element is d11, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:

0.39≤f6/f≤2.20；

0.07≤(R11+R12)/(R11-R12)≤1.01；

0.04≤d11/TTL≤0.22。

9. the image-capturing optical lens unit according to claim 1, wherein the seventh lens element has a focal length f7, a radius of curvature of the object-side surface of the seventh lens element is R13, a radius of curvature of the image-side surface of the seventh lens element is R14, and the image-capturing optical lens unit has a total optical length TTL satisfying the following relationships:

-2.49≤f7/f≤-0.61；

1.46≤(R13+R14)/(R13-R14)≤5.26；

0.04≤d13/TTL≤0.19。

10. 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: f12/f is more than or equal to 0.37 and less than or equal to 2.25.