CN110955028B

CN110955028B - Image pickup optical lens

Info

Publication number: CN110955028B
Application number: CN201911370714.0A
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: 2019-12-26
Filing date: 2019-12-26
Publication date: 2022-04-26
Anticipated expiration: 2039-12-26
Also published as: CN110955028A

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; and satisfies the following relationships: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; -10.00. ltoreq. R13/R14. ltoreq.1.00; d2/d4 is more than or equal to 1.50 and less than or equal to 4.00. 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 with a good function, a light weight, a small size and a light weight, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market. In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, five-piece, six-piece and seven-piece lens structures gradually appear in the design of the lens. A wide-angle imaging lens having excellent optical characteristics, being ultra-thin and having sufficient chromatic aberration correction is in demand.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of ultra-thinning and wide angle while achieving high imaging performance.

To solve the above technical problem, an embodiment of the present invention provides an imaging optical lens, which includes seven 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 negative refractive power, a fifth lens element, a sixth lens element, and a seventh lens element;

the focal length of the image pickup optical lens is f, the focal length of the second lens is f2, the maximum field angle of the image pickup optical lens is FOV, the curvature radius of the object side surface of the seventh lens is R13, the curvature radius of the image side surface of the seventh lens is R14, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, and 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 following relational expressions are satisfied: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; -10.00. ltoreq. R13/R14. ltoreq.1.00; f2/f is more than or equal to 5.79 and less than or equal to 836.22; d2/d4 is more than or equal to 1.50 and less than or equal to 4.00.

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 first lens is f1, 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 thickness of the first lens is d1, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied: f1/f is not less than-3.62 and not more than-1.04; (R1+ R2)/(R1-R2) is not more than 0.11 and not more than 1.00; d1/TTL is more than or equal to 0.04 and less than or equal to 0.14.

Preferably, the imaging optical lens satisfies the following relational expression: f1/f is more than or equal to-2.26 and less than or equal to-1.30; (R1+ R2)/(R1-R2) is not more than 0.18 and not more than 0.80; d1/TTL is more than or equal to 0.06 and less than or equal to 0.11.

Preferably, the object-side surface of the second lens element is convex in the paraxial region, and the image-side surface thereof is concave in the paraxial region; the focal length of the second lens is f2, the curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, the on-axis thickness of the second lens is d3, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied: f2/f is not less than 3.62 and not more than 1045.28; -46.06 ≤ (R3+ R4)/(R3-R4) ≤ 936.38; d3/TTL is more than or equal to 0.02 and less than or equal to 0.09.

Preferably, the imaging optical lens satisfies the following relational expression: -28.79 ≤ (R3+ R4)/(R3-R4) ≤ 749.10; d3/TTL is more than or equal to 0.03 and less than or equal to 0.07.

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 third lens is f3, the curvature radius of the object-side surface of the third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the on-axis thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL and satisfies the following relation: f3/f is more than or equal to 0.35 and less than or equal to 1.28; (R5+ R6)/(R5-R6) is not more than 0.12 and not more than 0.78; d5/TTL is more than or equal to 0.04 and less than or equal to 0.21.

Preferably, the imaging optical lens satisfies the following relational expression: f3/f is more than or equal to 0.56 and less than or equal to 1.02; (R5+ R6)/(R5-R6) is not more than 0.20 and not more than 0.62; d5/TTL is more than or equal to 0.06 and less than or equal to 0.17.

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: f4/f is not less than 9.94 and not more than-0.70; -7.00 ≤ (R7+ R8)/(R7-R8) 4.94; d7/TTL is more than or equal to 0.02 and less than or equal to 0.15.

Preferably, the imaging optical lens satisfies the following relational expression: f4/f is not less than 6.21 and not more than-0.88; -4.37 ≤ (R7+ R8)/(R7-R8) 3.95; d7/TTL is more than or equal to 0.02 and less than or equal to 0.12.

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 imaging optical lens assembly is TTL, and the following relationships are satisfied: -6.06 ≤ f5/f ≤ 7.47; -1.94 ≤ (R9+ R10)/(R9-R10) 1.71; d9/TTL is more than or equal to 0.02 and less than or equal to 0.15.

Preferably, the imaging optical lens satisfies the following relational expression: -3.79. ltoreq. f 5/f. ltoreq.5.97; -1.21 ≤ (R9+ R10)/(R9-R10) 1.37; d9/TTL is more than or equal to 0.04 and less than or equal to 0.12.

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, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships: 26.24 ≤ f6/f ≤ 1.53; -8.12 ≤ (R11+ R12)/(R11-R12) 1.53; d11/TTL is more than or equal to 0.02 and less than or equal to 0.18.

Preferably, the imaging optical lens satisfies the following relational expression: -16.40. ltoreq. f 6/f. ltoreq.1.22; -5.07 ≤ (R11+ R12)/(R11-R12) 1.22; d11/TTL is more than or equal to 0.03 and less than or equal to 0.14.

Preferably, an image-side surface of the seventh lens element is concave in a paraxial region, a focal length of the seventh lens element is f7, an on-axis thickness of the seventh lens element is d13, and an optical total length of the imaging optical lens system is TTL and satisfies the following relationship: -2.03. ltoreq. f 7/f. ltoreq.8.69; the ratio of (R13+ R14)/(R13-R14) is not more than 1391.79 and not more than 1.23; d13/TTL is more than or equal to 0.05 and less than or equal to 0.25.

Preferably, the imaging optical lens satisfies the following relational expression: -1.27. ltoreq. f 7/f. ltoreq.6.95; -869.87 (R13+ R14)/(R13-R14) is less than or equal to 0.98; d13/TTL is more than or equal to 0.08 and less than or equal to 0.20.

Preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied: f12/f is not less than-4.01 and not more than-1.11.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 8.34 millimeters.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 7.96 millimeters.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.88.

Preferably, the F-number of the imaging optical lens is less than or equal to 2.83.

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 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.

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 zoom lens 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 negative refractive power, a fifth lens element L5, a sixth lens element L6 and a seventh lens element L7. An optical element such as an optical filter (filter) GF may be disposed on the image side of the seventh lens element L7.

The maximum field angle of the image pickup optical lens 10 is defined as FOV (field of view), FOV is greater than or equal to 100.00 and less than or equal to 135.00, and the field angle of the image pickup optical lens 10 is defined, so that ultra-wide-angle image pickup can be realized within the range, and the user experience is improved. Preferably, the angle satisfies 100.00 DEG-135.00 DEG FOV.

The curvature radius of the object side surface of the seventh lens L7 is defined as R13, the curvature radius of the image side surface of the seventh lens L7 is defined as R14, -10.00-R13/R14-1.00, the shape of the seventh lens L7 is defined, and when the curvature radius is within the range, the aberration problem of the off-axis picture angle is favorably corrected along with the development of the lens towards the ultra-thin wide angle.

The axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 is defined as d2, the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 is defined as d4, the distance between the image side surface of the second lens L2/d 4 is defined as being equal to or less than 4.00, and the ratio of the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 to the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 is defined, so that when the distance is within the range, the lens barrel is favorable for being ultrathin.

When the maximum field angle, the on-axis thickness of each lens, and the curvature radius of the optical imaging lens 10 according to the present invention satisfy the above relationship, the optical imaging lens 10 can have high performance and meet the design requirement of low TTL.

In this embodiment, the object-side surface of the first lens element L1 is concave in the paraxial region thereof, and the image-side surface thereof is concave in the paraxial region thereof.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the first lens L1 is f1, and the following relations are satisfied: -3.62. ltoreq. f 1/f. ltoreq. 1.04, 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 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, it satisfies-2.26. ltoreq. f 1/f. ltoreq-1.30.

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: 0.11 ≦ (R1+ R2)/(R1-R2) ≦ 1.00, and the shape of the first lens is reasonably controlled so that the first lens can effectively correct the system spherical aberration; preferably, 0.18. ltoreq. R1+ R2)/(R1-R2. ltoreq.0.80 is satisfied.

The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.04 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 1/TTL. ltoreq.0.11 is satisfied.

In this embodiment, the object-side surface of the second lens element L2 is convex and the image-side surface thereof is concave.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the second lens L2 is f2, and the following relations are satisfied: f2/f 1045.28 is 3.62 ≤ f2/f, and the positive power of the second lens L2 is controlled in a reasonable range to correct aberration of the optical system. Preferably, 5.79. ltoreq. f 2/f. ltoreq. 836.22.

The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relations: 46.06 ≦ (R3+ R4)/(R3-R4) ≦ 936.38, and defines the shape of the second lens L2, and is advantageous for correcting the problem of chromatic aberration on the axis as the lens is made to have a super-thin wide angle within the range. Preferably, it satisfies-28.79 ≦ (R3+ R4)/(R3-R4) ≦ 749.10.

The on-axis thickness of the second lens L2 is d3, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d3/TTL is more than or equal to 0.02 and less than or equal to 0.09, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.07 is satisfied.

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

The focal length of the entire image pickup optical lens 10 is f, the focal length of the third lens L3 is f3, and the following relationships are satisfied: f3/f is more than or equal to 0.35 and less than or equal to 1.28, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.56. ltoreq. f 3/f. ltoreq.1.02 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 satisfy the following relations: the (R5+ R6)/(R5-R6) is not more than 0.12 and not more than 0.78, 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, 0.20. ltoreq. R5+ R6)/(R5-R6. ltoreq.0.62 is satisfied.

The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d5/TTL is more than or equal to 0.04 and less than or equal to 0.21, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 5/TTL. ltoreq.0.17 is satisfied.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fourth lens L4 is f4, and the following relations are satisfied: 9.94 ≦ f4/f ≦ -0.70, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-6.21. ltoreq. f 4/f. ltoreq-0.88.

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: (R7+ R8)/(R7-R8) is 7.00. ltoreq.4.94, and the shape of the fourth lens L4 is defined so that the aberration of the off-axis angle can be easily corrected with the development of an ultra-thin wide angle within the range. Preferably, it satisfies-4.37. ltoreq. (R7+ R8)/(R7-R8). ltoreq.3.95.

The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.15, and ultra-thinning is facilitated. Preferably, 0.02. ltoreq. d 7/TTL. ltoreq.0.12 is satisfied.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fifth lens L5 is f5, and the following relations are satisfied: 6.06 ≦ f5/f ≦ 7.47, the definition of the fifth lens L5 can effectively make the light angle of the camera lens gentle, and reduce tolerance sensitivity. Preferably, it satisfies-3.79. ltoreq. f 5/f. ltoreq.5.97.

The curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relations: -1.94 ≦ (R9+ R10)/(R9-R10) ≦ 1.71, 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, it satisfies-1.21. ltoreq. (R9+ R10)/(R9-R10). ltoreq.1.37.

The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d9/TTL is more than or equal to 0.02 and less than or equal to 0.15, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 9/TTL. ltoreq.0.12 is satisfied.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the sixth lens L6 is f6, and the following relationships are satisfied: 26.24 ≦ f6/f ≦ 1.53, which allows better imaging quality and lower sensitivity of the system by a reasonable distribution of the powers. Preferably, it satisfies-16.40. ltoreq. f 6/f. ltoreq.1.22.

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: the (R11+ R12)/(R11-R12) is not more than 8.12 and not more than 1.53, and the shape of the sixth lens L6 is defined, and when the conditions are within the range, the problem of aberration of off-axis view angle is favorably corrected as the ultra-thin wide angle is developed. Preferably, it satisfies-5.07. ltoreq. (R11+ R12)/(R11-R12). ltoreq.1.22.

The on-axis thickness of the sixth lens L6 is d11, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d11/TTL is more than or equal to 0.02 and less than or equal to 0.18, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 11/TTL. ltoreq.0.14 is satisfied.

In the present embodiment, the image-side surface of the seventh lens L7 is concave in the paraxial region.

The focal length of the entire image pickup optical lens 10 is f, and the focal length of the seventh lens L7 is f7, and the following relations are satisfied: 2.03 ≦ f7/f ≦ 8.69, which allows better imaging quality and lower sensitivity of the system by a reasonable distribution of the powers. Preferably, it satisfies-1.27. ltoreq. f 7/f. ltoreq.6.95.

The curvature radius R13 of the object-side surface of the seventh lens L7 and the curvature radius R14 of the image-side surface of the seventh lens L7 satisfy the following relations: -1391.79 ≦ (R11+ R12)/(R11-R12) ≦ 1.23, and the shape of the seventh lens L7 is specified, which is advantageous for correcting the off-axis aberration of the field angle and the like as the ultra-thin wide angle progresses in a condition range. Preferably, the ratio of-869.87 ≦ (R11+ R12)/(R11-R12) ≦ 0.98 is satisfied.

The on-axis thickness of the seventh lens L7 is d13, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d13/TTL is more than or equal to 0.05 and less than or equal to 0.25, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 13/TTL. ltoreq.0.20 is satisfied.

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 not less than 4.01 and not more than-1.11, so that 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, -2.51. ltoreq. f 12/f. ltoreq-1.39.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 8.34 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 7.96 millimeters.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.88 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 2.83 or less.

With such a design, the total optical length TTL of the entire imaging optical lens 10 can be made as short as possible, and the characteristic of miniaturization can be maintained.

The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. 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 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	1	0.455
P1R2	0
				P2R1	1	0.735
P2R2	0
				P3R1	1	0.515
P3R2	0
				P4R1	0
P4R2	1	0.325
				P5R1	2	0.555	1.055
P5R2	1	0.335
				P6R1	2	0.545	1.415
P6R2	2	1.455	1.635
				P7R1	1	0.505
P7R2	1	0.705

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	1	0.865
P1R2	0
			P2R1	0
P2R2	0
			P3R1	0
P3R2	0
			P4R1	0
P4R2	1	0.645
			P5R1	0
P5R2	1	0.605
			P6R1	1	0.905
P6R2	0
			P7R1	1	0.925
P7R2	1	1.565

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 21 shown later shows values of the respective numerical values in examples 1, 2, 3, 4, and 5 corresponding to the parameters specified in the conditional expressions.

As shown in table 21, the first embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.011mm, a full field height of 3.248mm, a maximum field angle of 100.49 °, a wide angle and a thin profile, and has excellent optical characteristics with a sufficient correction of on-axis and off-axis chromatic aberration.

(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
				P1R1	1	0.315
P1R2	2	1.195	1.365
				P2R1	1	0.735
P2R2	1	0.625
				P3R1	1	0.415
P3R2	0
				P4R1	1	0.425
P4R2	1	1.005
				P5R1	1	1.155
P5R2	0
				P6R1	1	1.365
P6R2	2	0.625	1.525
				P7R1	2	0.575	1.655
P7R2	1	0.755

[ TABLE 8 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	0.565
P1R2	0
				P2R1	0
P2R2	0
				P3R1	1	0.585
P3R2	0
				P4R1	1	0.795
P4R2	0
				P5R1	0
P5R2	0
				P6R1	0
P6R2	2	0.905	1.715
				P7R1	1	1.055
P7R2	1	1.575

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 21, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.066mm, a full field image height of 3.248mm, a maximum field angle of 103.13 °, a wide angle, and a high profile, and has excellent optical characteristics with a sufficient correction of on-axis and off-axis chromatic aberration.

(third embodiment)

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

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

[ TABLE 9 ]

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

[ TABLE 10 ]

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

[ TABLE 11 ]

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	1	0.555
P1R2	0
			P2R1	0
P2R2	0
			P3R1	0
P3R2	0
			P4R1	1	0.345
P4R2	0
			P5R1	1	0.965
P5R2	1	0.105
			P6R1	0
P6R2	0
			P7R1	0
P7R2	1	1.525

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.

As shown in table 21, the third embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.116mm, a full field height of 3.248mm, a maximum field angle of 114.03 °, 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
				P1R1	2	0.335	1.695
P1R2	1	1.195
				P2R1	0
P2R2	0
				P3R1	2	0.635	0.715
P3R2	0
				P4R1	1	0.935
P4R2	1	0.475
				P5R1	2	0.235	1.025
P5R2	0
				P6R1	1	1.505
P6R2	0
				P7R1	0
P7R2	1	0.795

[ TABLE 16 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	0.595
P1R2	0
				P2R1	0
P2R2	0
				P3R1	0
P3R2	0
				P4R1	0
P4R2	1	0.915
				P5R1	2	0.465	1.175
P5R2	0
				P6R1	0
P6R2	0
				P7R1	0
P7R2	1	1.825

Fig. 14 and 15 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 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.

As shown in table 21, the fourth embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.158mm, a full field image height of 3.248mm, a maximum field angle of 103.40 °, a wide angle, and a high profile, and has excellent optical characteristics with a sufficient correction of on-axis and off-axis chromatic aberration.

(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 ]

[ TABLE 20 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	1	0.655
P1R2	0
			P2R1	1	0.705
P2R2	0
			P3R1	0
P3R2	0
			P4R1	1	0.295
P4R2	0
			P5R1	1	0.785
P5R2	1	0.195
			P6R1	1	0.345
P6R2	0
			P7R1	0
P7R2	1	1.465

Fig. 18 and 19 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 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.

As shown in table 21, the fifth embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.887mm, a full field image height of 3.248mm, a maximum field angle of 134.98 °, a wide angle, and a high profile, and has excellent optical characteristics with a sufficiently corrected on-axis and off-axis chromatic aberration.

Table 21 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.

[ TABLE 21 ]

In table 21, FNO is the number of apertures F of the imaging optical lens, and F12 is the 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, comprising seven lenses in total, 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 negative refractive power, a fifth lens element, a sixth lens element, and a seventh lens element;

the focal length of the image pickup optical lens is f, the focal length of the second lens is f2, the focal length of the fifth lens is f5, the maximum field angle of the image pickup optical lens is FOV, the curvature radius of the object-side surface of the seventh lens is R13, the curvature radius of the image-side surface of the seventh lens is R14, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, so that the following relations are satisfied:

100.00°≤FOV≤135.00°；

-10.00≤R13/R14≤1.00；

5.79≤f2/f≤836.22；

-6.06≤f5/f≤7.47；

1.50≤d2/d4≤4.00。

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

the focal length of the first lens is f1, 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 thickness of the first lens is d1, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:

-3.62≤f1/f≤-1.04；

0.11≤(R1+R2)/(R1-R2)≤1.00；

0.04≤d1/TTL≤0.14。

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

-2.26≤f1/f≤-1.30；

0.18≤(R1+R2)/(R1-R2)≤0.80；

0.06≤d1/TTL≤0.11。

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

the curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, the on-axis thickness of the second lens is d3, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:

-46.06≤(R3+R4)/(R3-R4)≤936.38；

0.02≤d3/TTL≤0.09。

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

-28.79≤(R3+R4)/(R3-R4)≤749.10；

0.03≤d3/TTL≤0.07。

6. the imaging optical lens assembly 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, and the total optical length of the imaging optical lens is TTL and satisfies the following relation:

0.35≤f3/f≤1.28；

0.12≤(R5+R6)/(R5-R6)≤0.78；

0.04≤d5/TTL≤0.21。

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

0.56≤f3/f≤1.02；

0.20≤(R5+R6)/(R5-R6)≤0.62；

0.06≤d5/TTL≤0.17。

8. 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:

-9.94≤f4/f≤-0.70；

-7.00≤(R7+R8)/(R7-R8)≤4.94；

0.02≤d7/TTL≤0.15。

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

-6.21≤f4/f≤-0.88；

-4.37≤(R7+R8)/(R7-R8)≤3.95；

0.02≤d7/TTL≤0.12。

10. the image-capturing optical lens unit according to claim 1, wherein 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-capturing optical lens unit is TTL, and the following relationships are satisfied:

-1.94≤(R9+R10)/(R9-R10)≤1.71；

0.02≤d9/TTL≤0.15。

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

-3.79≤f5/f≤5.97；

-1.21≤(R9+R10)/(R9-R10)≤1.37；

0.04≤d9/TTL≤0.12。

12. 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:

-26.24≤f6/f≤1.53；

-8.12≤(R11+R12)/(R11-R12)≤1.53；

0.02≤d11/TTL≤0.18。

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

-16.40≤f6/f≤1.22；

-5.07≤(R11+R12)/(R11-R12)≤1.22；

0.03≤d11/TTL≤0.14。

14. the imaging optical lens of claim 1, wherein the image-side surface of the seventh lens element is concave at the paraxial region, the focal length of the seventh lens element is f7, the on-axis thickness of the seventh lens element is d13, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

-2.03≤f7/f≤8.69；

-1391.79≤(R13+R14)/(R13-R14)≤1.23；

0.05≤d13/TTL≤0.25。

15. the image-pickup optical lens according to claim 14, wherein the image-pickup optical lens satisfies the following relation:

-1.27≤f7/f≤6.95；

-869.87≤(R13+R14)/(R13-R14)≤0.98；

0.08≤d13/TTL≤0.20。

16. 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:

-4.01≤f12/f≤-1.11。

17. 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 8.34 mm.

18. A camera optical lens according to claim 17, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 7.96 mm.

19. 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 2.88.

20. A camera optical lens according to claim 19, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.83.