CN111025567B

CN111025567B - Image pickup optical lens

Info

Publication number: CN111025567B
Application number: CN201911367111.5A
Authority: CN
Inventors: 阪口貴之; 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: 2022-01-07
Anticipated expiration: 2039-12-26
Also published as: CN111025567A

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens element with negative refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element, a sixth lens element and a seventh lens element; and satisfies the following relationships: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees, f4/f is more than or equal to 1.00 degrees and less than or equal to 15.00 degrees, f7/f is more than or equal to 2.00 degrees and less than or equal to 5.00 degrees; the ratio of (R3+ R4)/(R3-R4) is not less than 7.00 and not more than 1.00. 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) Sensor, and due to the advanced semiconductor manufacturing process technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed with a good function, a light weight, a small size and a light weight, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market. In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, the seven-piece lens structure gradually appears in the design of the lens. A wide-angle imaging lens having excellent optical characteristics, being ultra-thin and having sufficient chromatic aberration correction is in demand.

Disclosure of Invention

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

To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens element with negative refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element, a sixth lens element and a seventh lens element; the imaging optical lens has a maximum field angle FOV, a focal length f4, a focal length f7, a radius of curvature R3 of the object-side surface of the second lens, and a radius of curvature R4, which satisfy the following relationships: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees, f4/f is more than or equal to 1.00 degrees and less than or equal to 15.00 degrees, f7/f is more than or equal to 2.00 degrees and less than or equal to 5.00 degrees; the ratio of (R3+ R4)/(R3-R4) is not less than 7.00 and not more than 1.00.

Preferably, the imaging optical lens satisfies the following relation: f4/f is more than or equal to 1.01 and less than or equal to 15.00, and f7/f is more than or equal to 1.99 and less than or equal to 5.00; the ratio of (R3+ R4)/(R3-R4) is not more than-6.99 and not more than-1.01.

Preferably, the image-side surface of the first lens is concave at 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, and the total optical length of the imaging optical lens is TTL and satisfies the following relational expression: f1/f is not less than 3.35 and not more than-0.91; (R1+ R2)/(R1-R2) is not more than 0.22 and not more than 2.63; d1/TTL is more than or equal to 0.02 and less than or equal to 0.06.

Preferably, the imaging optical lens satisfies the following relation: f1/f is not less than-1.13 and is not less than-2.09; (R1+ R2)/(R1-R2) is not more than 0.36 and not more than 2.10; d1/TTL is more than or equal to 0.03 and less than or equal to 0.05.

Preferably, the object-side surface of the second lens element is concave at the paraxial region, and the image-side surface thereof is convex at the paraxial region; the focal length of the second lens is f2, the on-axis thickness of the second lens is d3, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied: f2/f is more than or equal to-21.09 and less than or equal to-2.11, and d3/TTL is more than or equal to 0.02 and less than or equal to 0.07.

Preferably, the imaging optical lens satisfies the following relation: f2/f is more than or equal to-13.18 and less than or equal to-2.64, and d3/TTL is more than or equal to 0.03 and less than or equal to 0.05.

Preferably, the object side surface of the third lens is convex at the paraxial region; the focal length of the third lens element is f3, 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, and the total optical length of the image pickup optical lens system is TTL and satisfies the following relationship: f3/f is more than or equal to 0.45 and less than or equal to 3.76, and (R5+ R6)/(R5-R6) is more than or equal to-0.11; d5/TTL is more than or equal to 0.03 and less than or equal to 0.16.

Preferably, the imaging optical lens satisfies the following relation: f3/f is more than or equal to 0.72 and less than or equal to 3.01, and (R5+ R6)/(R5-R6) is more than or equal to-0.14; d5/TTL is more than or equal to 0.05 and less than or equal to 0.13.

Preferably, the image-side surface of the fourth lens is convex at the paraxial region; the focal length of the fourth lens is f4, the curvature radius of the object-side surface of the fourth lens is R7, the curvature radius of the image-side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL and satisfies the following relation: f4/f is more than or equal to 0.51 and less than or equal to 22.48; -1.02 ≤ (R7+ R8)/(R7-R8) ≤ 36.86; d7/TTL is more than or equal to 0.02 and less than or equal to 0.12.

Preferably, the imaging optical lens satisfies the following relation: f4/f is more than or equal to 0.81 and less than or equal to 17.99; -0.64 ≦ (R7+ R8)/(R7-R8) ≦ 29.49; d7/TTL is more than or equal to 0.04 and less than or equal to 0.10.

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: f5/f is more than or equal to 0.55 and less than or equal to 1.87; -2.91 ≤ (R9+ R10)/(R9-R10) 1.94; d9/TTL is more than or equal to 0.03 and less than or equal to 0.12.

Preferably, the imaging optical lens satisfies the following relation: f5/f is more than or equal to 0.88 and less than or equal to 1.50; -1.82 ≤ (R9+ R10)/(R9-R10) 1.55; d9/TTL is more than or equal to 0.06 and less than or equal to 0.09.

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 not less than 3.52 and not more than-0.49; -2.41 ≤ (R11+ R12)/(R11-R12) 4.00; d11/TTL is more than or equal to 0.02 and less than or equal to 0.08.

Preferably, the imaging optical lens satisfies the following relation: f6/f is not less than 2.20 and not more than-0.61; -1.51 ≤ (R11+ R12)/(R11-R12) 3.20; d11/TTL is more than or equal to 0.03 and less than or equal to 0.06.

Preferably, the object side surface of the seventh lens is convex at the paraxial region; the curvature radius of the object-side surface of the seventh lens element is R13, the curvature radius of the image-side surface of the seventh lens element is R14, the on-axis thickness of the seventh lens element is d13, and the total optical length of the imaging optical lens system is TTL and satisfies the following relation: -14.02 (R13+ R14)/(R13-R14) is 2.47 or more, and d13/TTL is 0.04 or less and 0.18 or less.

Preferably, the imaging optical lens satisfies the following relation: (R13+ R14)/(R13-R14) is not less than 8.76 and not more than 1.97, and d13/TTL is not less than 0.07 and not more than 0.14.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 8.25 millimeters.

Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 7.87 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 shown in fig. 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.

(first embodiment)

Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an image pickup optical lens 10 according to a first embodiment of the present invention, and the image pickup optical lens 10 includes seven lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a first lens L1, a second lens L2, a third lens L3, a stop S1, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter (filter) GF may be disposed between the seventh lens L7 and the image plane Si.

The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic.

The maximum field angle of the camera optical lens is defined as FOV, the FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees, the field angle of the camera optical lens 10 is defined, ultra-wide-angle camera shooting can be achieved within the range, and user experience is improved.

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: f4/f is more than or equal to 1.00 and less than or equal to 15.00, the ratio of the focal length of the fourth lens to the focal length of the system is specified, and the performance of the optical system is improved in a conditional expression range.

The focal length of the whole shooting optical lens 10 is defined as f, the focal length of the seventh lens L7 is defined as f7, -2.00 ≤ f7/f ≤ 5.00, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power within the conditional expression range.

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: the shape of the second lens L2 is defined to be not less than 7.00 (R3+ R4)/(R3-R4) and not more than-1.00, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is brought to an ultra-thin wide angle within the range.

When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the on-axis thickness, and the radius of curvature of the lens according to the present invention satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirements of an ultrathin, wide-angle, and large aperture.

In this embodiment, the first lens element with negative refractive power has a concave image-side surface at a paraxial region. The focal length of the whole shooting optical lens 10 is defined as f, the focal length of the first lens L1 is defined as f1, f1/f is more than or equal to-3.35 and less than or equal to-0.91, and the ratio of the negative refractive power of the first lens L1 to the whole focal length is defined. When the first lens element is within the specified range, the first lens element has appropriate negative refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens. Preferably, it satisfies-2.09. ltoreq. f 1/f. ltoreq-1.13.

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 0.02 and less than or equal to 0.06, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 1/TTL. ltoreq.0.05.

In this embodiment, the second lens element with negative refractive power has a concave object-side surface and a convex image-side surface.

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: 21.09. ltoreq. f 2/f. ltoreq. 2.11, and correction of aberration of the optical system is facilitated by controlling the negative power of the second lens L2 to a reasonable range. Preferably-13.18. ltoreq. f 2/f. ltoreq-2.64.

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 0.07, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.05.

In this embodiment, the third lens element with positive refractive power has a convex object-side surface at a paraxial region.

The focal length of the whole shooting optical lens 10 is defined as f, the focal length of the third lens L3 is defined as f3, f3/f is more than or equal to 0.45 and less than or equal to 3.76, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 0.72. ltoreq. f 3/f. ltoreq.3.01.

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: 9.06 ≦ (R5+ R6)/(R5-R6) ≦ -0.11, and defines the shape of the third lens, and within the range defined by the conditional expression, the degree of deflection of the light rays passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, -5.66 ≦ (R5+ R6)/(R5-R6) ≦ -0.14.

The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.03 and less than or equal to 0.16, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 5/TTL. ltoreq.0.13.

In this embodiment, the fourth lens element with positive refractive power has a convex image-side surface at a paraxial region.

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: -1.02 ≦ (R7+ R8)/(R7-R8) ≦ 36.86, and defines the shape of the fourth lens L4, which is advantageous for correcting the aberration of the off-axis angle and the like with the development of an ultra-thin wide angle in the range. Preferably, -0.64 ≦ (R7+ R8)/(R7-R8). ltoreq.29.49.

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 0.12, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 7/TTL. ltoreq.0.10.

In this embodiment, the fifth lens element has positive refractive power.

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: f5/f is more than or equal to 0.55 and less than or equal to 1.87, 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, 0.88. ltoreq. f 5/f. ltoreq.1.50.

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: the shape of the fifth lens L5 is defined to be (R9+ R10)/(R9-R10) to be (1.94) 2.91 or more, and the shape is advantageous for correcting the aberration of the off-axis angle and the like with the development of an ultra-thin wide angle in the range. Preferably, -1.82 ≦ (R9+ R10)/(R9-R10). ltoreq.1.55.

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 0.03 and less than or equal to 0.12, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 9/TTL. ltoreq.0.09.

In this embodiment, the sixth lens element has negative refractive power.

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: 3.52 ≦ f6/f ≦ -0.49, and the system has better imaging quality and lower sensitivity through reasonable distribution of power within the conditional range. Preferably, -2.20. ltoreq. f 6/f. ltoreq-0.61.

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: -2.41 ≦ (R11+ R12)/(R11-R12) ≦ 4.00, and the shape of the sixth lens L6 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, -1.51 ≦ (R11+ R12)/(R11-R12) ≦ 3.20.

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 0.08, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 11/TTL. ltoreq.0.06.

In this embodiment, the object-side surface of the seventh lens element is convex at a paraxial region.

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: 14.02 ≦ (R13+ R14)/(R13-R14) ≦ 2.47, and the shape of the sixth lens L6 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, the ratio of-8.76 to (R13+ R14)/(R13 to R14) is 1.97.

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 0.04 and less than or equal to 0.18, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 13/TTL. ltoreq.0.14.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 8.25 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 7.87.

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: total optical length (on-axis distance from the object-side surface of the first lens L1 to the image plane) in mm;

preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.

Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[ TABLE 1 ]

Wherein each symbol has the following meaning.

S1, diaphragm;

r is the curvature radius of the optical surface and the central curvature radius when the lens is used;

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

r2 radius of curvature of image side surface of first lens L1;

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

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

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

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

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

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

r9 radius of curvature of object-side surface of fifth lens L5;

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

r11 radius of curvature of object-side surface of sixth lens L6;

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

r13 radius of curvature of object-side surface of seventh lens L7;

r14 radius of curvature of the image-side surface of the seventh lens L7;

r15 radius of curvature of the object side of the optical filter GF;

r16 radius of curvature of image side of optical filter GF;

d is the on-axis thickness of the lenses and the on-axis distance between the lenses;

d 0: the on-axis distance of the stop S1 to the object-side surface of the first lens L1;

d1: the on-axis thickness of the first lens L1;

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

d3: the on-axis thickness of the second lens L2;

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

d5: the on-axis thickness of the third lens L3;

d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d 7: the on-axis thickness of the fourth lens L4;

d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;

d 9: the on-axis thickness of the fifth lens L5;

d 10: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;

d 11: the on-axis thickness of the sixth lens L6;

d 12: an on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d 13: the on-axis thickness of the seventh lens L7;

d 14: the on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the optical filter GF;

d 15: on-axis thickness of the optical filter GF;

d 16: the on-axis distance from the image side surface of the optical filter GF to the image surface;

nd is the refractive index of the d line;

nd1 refractive index of d-line of the first lens L1;

nd2 refractive index of d-line of the second lens L2;

nd3 refractive index of d-line of the third lens L3;

nd4 refractive index of d-line of the fourth lens L4;

nd5 refractive index of d-line of the fifth lens L5;

nd 6: the refractive index of the d-line of the sixth lens L6;

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

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

vd is Abbe number;

v 1: abbe number of the first lens L1;

v 2: abbe number of the second lens L2;

v 3: abbe number of the third lens L3;

v 4: abbe number of the fourth lens L4;

v 5: abbe number of the fifth lens L5;

v 6: abbe number of the sixth lens L6;

v 7: abbe number of the seventh lens L7;

vg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[ TABLE 2 ]

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

IH image height

y＝(x²/R)/[1+{1-(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴ (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, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, respectively. 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	0.565
P1R2	0
				P2R1	2	0.355	1.155
P2R2	1	0.255
				P3R1	1	0.815
P3R2	1	0.455
				P4R1	1	0.755
P4R2	1	1.075
				P5R1	1	0.805
P5R2	1	0.945
				P6R1	1	0.445
P6R2	2	0.775	1.355
				P7R1	2	0.295	1.725
P7R2	1	0.685

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1
			P1R1	1	0.995
P1R2	0
			P2R1	1	0.615
P2R2	1	0.445
			P3R1	0
P3R2	1	0.775
			P4R1	0
P4R2	0
			P5R1	1	1.055
P5R2	0
			P6R1	1	0.765
P6R2	0
			P7R1	1	0.515
P7R2	1	1.375

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification after light having wavelengths of 656nm, 588nm and 486nm passes 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 588nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.

Table 13 shown later shows values of various numerical values in examples 1, 2, and 3 corresponding to the parameters specified in the conditional expressions.

As shown in table 13, the first embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.376mm, a full field image height of 3.38mm, a maximum field angle of 100.10 °, a wide angle and a thin profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(second embodiment)

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

Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[ TABLE 5 ]

Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention. The object side surface of the first lens is a spherical surface.

[ 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. 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, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, respectively. 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 20. 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 image pickup optical lens 20.

[ TABLE 7 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	0
P1R2	1	1.235
				P2R1	2	0.345	0.905
P2R2	1	0.035
				P3R1	1	0.865
P3R2	0
				P4R1	1	0.455
P4R2	0
				P5R1	2	0.695	1.155
P5R2	2	0.575	1.125
				P6R1	2	1.195	1.325
P6R2	2	1.165	1.735
				P7R1	2	0.765	2.145
P7R2	2	0.905	2.705

[ TABLE 8 ]

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification after light having wavelengths of 656nm, 588nm and 486nm passes 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 588nm after passing through the imaging optical lens 20 according to the second embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.

As shown in table 13, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.165mm, a full field image height of 3.61mm, a maximum field angle of 134.90 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its on-axis and off-axis chromatic aberration sufficiently corrected.

(third embodiment)

The third embodiment is basically the same as the 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. The object side surface of the first lens is a spherical surface.

[ 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. 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, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, respectively. 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 30. The data corresponding to the "stagnation point position" field is the vertical distance from the stagnation point set on the surface of each lens to the optical axis of the image pickup optical lens 30.

[ TABLE 11 ]

	Number of points of inflection	Position of reverse curvature 1	Position of reverse curvature 2
				P1R1	0
P1R2	1	1.325
				P2R1	2	0.425	0.945
P2R2	1	0.295
				P3R1	1	0.665
P3R2	0
				P4R1	1	0.665
P4R2	0
				P5R1	1	1.105
P5R2	2	0.835	1.165
				P6R1	2	1.005	1.195
P6R2	2	0.965	1.685
				P7R1	2	0.725	1.965
P7R2	2	0.275	0.895

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	0
				P2R1	2	0.815	1.025
P2R2	1	0.505
				P3R1	0
P3R2	0
				P4R1	0
P4R2	0
				P5R1	0
P5R2	2	1.145	1.175
				P6R1	0
P6R2	1	1.465
				P7R1	2	1.675	2.225
P7R2	2	0.505	1.135

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification after passing through the imaging optical lens 30 according to the third embodiment, respectively, for light having wavelengths of 656nm, 588nm, and 486 nm. Fig. 10 is a schematic view showing curvature of field and distortion of light having a wavelength of 588nm after passing through the imaging optical lens 30 according to the third embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 11.

Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.165mm, a full field image height of 3.62mm, a maximum field angle of 117.50 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 13 ]

Parameter and condition formula	Example 1	Example 2	Example 3
				f	3.852	3.263	3.263
f1	-5.571	-4.432	-5.461
				f2	-40.629	-10.324	-11.790
f3	9.654	2.953	4.056
				f4	3.891	48.915	26.106
f5	4.800	3.925	3.579
				f6	-6.780	-3.420	-2.405
f7	-7.625	16.285	4.898
				f12	-4.900	-2.967	-3.612
FNO	2.80	2.80	2.80
				FOV	100.10	134.90	117.50
f4/f	1.01	14.99	8.00
				f7/f	-1.98	4.99	1.50
(R3+R4)/(R3-R4)	-6.98	-1.02	-4.00

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

the imaging optical lens has a maximum field angle FOV, a focal length f3, a focal length f4, a focal length f7, a radius of curvature of the object-side surface of the second lens element R3, and a radius of curvature of the image-side surface of the second lens element R4, and satisfies the following relationships:

100.00°≤FOV≤135.00°，

1.00≤f4/f≤15.00，

-2.00≤f7/f≤5.00；

-7.00≤(R3+R4)/(R3-R4)≤-1.00；

0.45≤f3/f≤3.76。

2. the imaging optical lens of claim 1, wherein the image side surface of the first lens is concave at 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, and the total optical length of the imaging optical lens is TTL and satisfies the following relational expression:

-3.35≤f1/f≤-0.91；

0.22≤(R1+R2)/(R1-R2)≤2.63；

0.02≤d1/TTL≤0.06。

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

-2.09≤f1/f≤-1.13；

0.36≤(R1+R2)/(R1-R2)≤2.10；

0.03≤d1/TTL≤0.05。

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

the focal length of the second lens is f2, the on-axis thickness of the second lens is d3, the total optical length of the shooting optical lens is TTL, and the following relational expression is satisfied:

-21.09≤f2/f≤-2.11，

0.02≤d3/TTL≤0.07。

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

-13.18≤f2/f≤-2.64，

0.03≤d3/TTL≤0.05。

6. the imaging optical lens of claim 1, wherein the object-side surface of the third lens element is convex at paraxial region;

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, and the total optical length of the imaging optical lens system is TTL and satisfies the following relation:

-9.06≤(R5+R6)/(R5-R6)≤-0.11；

0.03≤d5/TTL≤0.16。

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

0.72≤f3/f≤3.01，

-5.66≤(R5+R6)/(R5-R6)≤-0.14；

0.05≤d5/TTL≤0.13。

8. the imaging optical lens of claim 1, wherein the image-side surface of the fourth lens element is convex at the paraxial region;

the curvature radius of the object-side surface of the fourth lens element is R7, the curvature radius of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, and the total optical length of the imaging optical lens system is TTL and satisfies the following relation:

-1.02≤(R7+R8)/(R7-R8)≤36.86；

0.02≤d7/TTL≤0.12。

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

-0.64≤(R7+R8)/(R7-R8)≤29.49；

0.04≤d7/TTL≤0.10。

10. 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:

0.55≤f5/f≤1.87；

-2.91≤(R9+R10)/(R9-R10)≤1.94；

0.03≤d9/TTL≤0.12。

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

0.88≤f5/f≤1.50；

-1.82≤(R9+R10)/(R9-R10)≤1.55；

0.06≤d9/TTL≤0.09。

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:

-3.52≤f6/f≤-0.49；

-2.41≤(R11+R12)/(R11-R12)≤4.00；

0.02≤d11/TTL≤0.08。

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

-2.20≤f6/f≤-0.61；

-1.51≤(R11+R12)/(R11-R12)≤3.20；

0.03≤d11/TTL≤0.06。

14. the imaging optical lens of claim 1, wherein the object-side surface of the seventh lens element is convex at the paraxial region;

the curvature radius of the object-side surface of the seventh lens element is R13, the curvature radius of the image-side surface of the seventh lens element is R14, the on-axis thickness of the seventh lens element is d13, and the total optical length of the imaging optical lens system is TTL and satisfies the following relation:

-14.02≤(R13+R14)/(R13-R14)≤2.47，

0.04≤d13/TTL≤0.18。

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

-8.76≤(R13+R14)/(R13-R14)≤1.97，

0.07≤d13/TTL≤0.14。

16. 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 8.25 mm.

17. A camera optical lens according to claim 16, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 7.87 mm.

18. 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.

19. A camera optical lens according to claim 18, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.83.