CN110955027B

CN110955027B - Image pickup optical lens

Info

Publication number: CN110955027B
Application number: CN201911368592.1A
Authority: CN
Inventors: 新田耕二; 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: 2022-03-01
Anticipated expiration: 2039-12-26
Also published as: CN110955027A

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises from an object side to an image side: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative 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 minus 10.00 and less than or equal to minus 1.00; -2.00. ltoreq. f 7/f. ltoreq.5.00; the ratio of (R3+ R4)/(R3-R4) is not less than-10.00 and not more than-3.50. 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-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative 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 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°；

-10.00≤f4/f≤-1.00；

-2.00≤f7/f≤5.00；

-10.00≤(R3+R4)/(R3-R4)≤-3.50。

optionally, a focal length of the first lens element is f1, a radius of curvature of an object-side surface of the first lens element is R1, a radius of curvature of an image-side surface of the first lens element is R2, and an on-axis thickness of the first lens element is d1, an optical total length of the image pickup optical lens is TTL, and the following relationships are satisfied:

-11.83≤f1/f≤-0.89；

-11.64≤(R1+R2)/(R1-R2)≤1.77；

0.03≤d1/TTL≤0.22。

optionally, the imaging optical lens satisfies the following relation:

-7.40≤f1/f≤-1.11；

-7.27≤(R1+R2)/(R1-R2)≤1.42；

0.04≤d1/TTL≤0.17。

optionally, an object-side surface of the second lens element is convex in a paraxial region, and an image-side surface of the second lens element is concave in 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:

2.04≤f2/f≤122.36；

0.02≤d3/TTL≤0.14。

optionally, the imaging optical lens satisfies the following relation:

3.26≤f2/f≤97.88；

0.03≤d3/TTL≤0.11。

optionally, both the object-side surface and the image-side surface of the third lens are convex in 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:

0.37≤f3/f≤2.67；

-0.53≤(R5+R6)/(R5-R6)≤0.31；

0.03≤d5/TTL≤0.19。

optionally, the imaging optical lens satisfies the following relation:

0.60≤f3/f≤2.14；

-0.33≤(R5+R6)/(R5-R6)≤0.25；

0.05≤d5/TTL≤0.15。

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

-3.85≤(R7+R8)/(R7-R8)≤15.33；

0.02≤d7/TTL≤0.09。

optionally, the imaging optical lens satisfies the following relation:

-2.41≤(R7+R8)/(R7-R8)≤12.26；

0.04≤d7/TTL≤0.07。

optionally, the image-side surface of the fifth lens element is convex at the paraxial region;

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, and the total optical length of the imaging optical lens assembly is TTL and satisfies the following relationship:

-58.05≤f5/f≤2.44；

-26.04≤(R9+R10)/(R9-R10)≤1.48；

0.02≤d9/TTL≤0.18。

optionally, the imaging optical lens satisfies the following relation:

-36.28≤f5/f≤1.95；

-16.27≤(R9+R10)/(R9-R10)≤1.18；

0.04≤d9/TTL≤0.15。

optionally, an object-side surface of the sixth lens element is convex at a paraxial region;

the focal length of the sixth lens element is f6, the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, and the total optical length of the imaging optical lens assembly is TTL and satisfies the following relation:

-47.96≤f6/f≤51.57；

-25.91≤(R11+R12)/(R11-R12)≤21.15；

0.04≤d11/TTL≤0.12。

optionally, the imaging optical lens satisfies the following relation:

-29.97≤f6/f≤41.25；

-16.19≤(R11+R12)/(R11-R12)≤16.92；

0.06≤d11/TTL≤0.09。

optionally, the image-side surface of the seventh lens is concave 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:

-10.12≤(R13+R14)/(R13-R14)≤2.58；

0.04≤d13/TTL≤0.19。

optionally, the imaging optical lens satisfies the following relation:

-6.33≤(R13+R14)/(R13-R14)≤2.06；

0.06≤d13/TTL≤0.15。

optionally, the total optical length TTL of the image pickup optical lens is less than or equal to 7.92 millimeters.

Optionally, the total optical length TTL of the image pickup optical lens is less than or equal to 7.56 millimeters.

Optionally, the F-number of the imaging optical lens is less than or equal to 2.32.

Optionally, the F-number of the imaging optical lens is less than or equal to 2.28.

The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, is extremely thin, has a wide angle, and sufficiently corrects chromatic aberration, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens which are configured by an imaging element such as a CCD or a CMOS for high pixel.

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.

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 stop S1, a third lens L3, 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 on the image side of the seventh lens element L7.

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, ultra-wide-angle camera shooting can be realized in the range, and user experience is improved.

The focal length of the whole image pickup optical lens 10 is defined as f, the focal length of the fourth lens element L4 is defined as f4, -10.00 ≤ f4/f ≤ 1.00, and the negative refractive power of the fourth lens element L4 is defined. If the negative refractive power exceeds the upper limit value, the lens is made thinner, but the negative refractive power of the fourth lens element L4 is too strong, which makes it difficult to correct aberrations and the like, and makes it difficult to make the lens wider. On the other hand, if the refractive power exceeds the lower limit predetermined value, the negative refractive power of the fourth lens element L4 becomes too weak, and the lens barrel becomes difficult to be made thinner.

The focal length of the seventh lens element L7 is f7, -2.00. ltoreq. f 7/f. ltoreq.5.00, which defines the refractive power of the seventh lens element L7. When the seventh lens element L7 exceeds the upper limit or the lower limit, the refractive power of the seventh lens element L7 becomes too weak, and the lens barrel becomes difficult to be made thinner.

The curvature radius of the object side surface of the second lens L2 is defined as R3, the curvature radius of the image side surface of the second lens L2 is defined as R4, -10.00 ≦ (R3+ R4)/(R3-R4) ≦ -3.50, and the shape of the second lens L2 is defined, so that problems such as off-axis aberration and the like are favorably corrected as the range is increased to an ultra-thin wide angle.

When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the total optical length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-mentioned relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL, which is the total optical length of the image pickup optical lens, i.e., the on-axis distance from the object-side surface of the first lens L1 to the image plane.

In this embodiment, the first lens element L1 has negative refractive power.

The focal length of the first lens L1 is defined as f1, -11.83 ≦ f1/f ≦ -0.89, and the ratio of the focal length of the first lens L1 to the overall focal length is specified. Within the specified range, the first lens element L1 has a positive refractive power, which is favorable for reducing system aberration and is favorable for the lens to be ultra-thin and wide-angled. Preferably-7.40. ltoreq. f 1/f. ltoreq-1.11.

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: 11.64 ≦ (R1+ R2)/(R1-R2) ≦ 1.77, the shape of the first lens L1 is controlled appropriately so that the first lens L1 can correct the system spherical aberration effectively; preferably, -7.27 ≦ (R1+ R2)/(R1-R2). ltoreq.1.42.

The first lens L1 has an on-axis thickness d1, and satisfies the following relationship: d1/TTL is more than or equal to 0.03 and less than or equal to 0.22, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 1/TTL. ltoreq.0.17.

In this embodiment, the object-side surface of the second lens element L2 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, and has positive refractive power.

The focal length f2 of the second lens L2 satisfies the following relation: 2.04 is less than or equal to f2/f is less than or equal to 122.36, and the positive focal power of the second lens L2 is controlled in a reasonable range, so that the aberration of the optical system can be corrected. Preferably, 3.26 ≦ f2/f ≦ 97.88.

The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.02 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.11.

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

The focal length f3 of the third lens L3 satisfies the following relation: f3/f is more than or equal to 0.37 and less than or equal to 2.67, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.60. ltoreq. f 3/f. ltoreq.2.14.

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 ratio of (R5+ R6)/(R5-R6) is 0.53-0.31, the shape of the third lens L3 can be effectively controlled, the forming 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, -0.33 ≦ (R5+ R6)/(R5-R6) ≦ 0.25.

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 0.19, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 5/TTL. ltoreq.0.15.

In this embodiment, the fourth lens element L4 has negative refractive power.

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: -3.85 ≦ (R7+ R8)/(R7-R8) less than or equal to 15.33, and the shape of the fourth lens L4 is specified, and when the shape is within the range, problems such as aberration of the off-axis angle and the like are easily corrected with the development of an ultra-thin wide angle. Preferably, -2.41 ≦ (R7+ R8)/(R7-R8). ltoreq.12.26.

The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.02 and less than or equal to 0.09, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 7/TTL. ltoreq.0.07.

In the present embodiment, the image-side surface of the fifth lens element L5 is convex at the paraxial region.

The focal length f5 of the fifth lens L5 satisfies the following relation: f5/f 2.44 is more than or equal to-58.05 and less than or equal to 2.44, 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, -36.28. ltoreq. f 5/f. ltoreq.1.95.

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: 26.04 (R9+ R10)/(R9-R10) is 1.48 or less, and the shape of the fifth lens L5 is defined to be advantageous for correcting the off-axis aberration of the field angle as the ultra-thin wide angle is increased within the condition range. Preferably, -16.27 ≦ (R9+ R10)/(R9-R10). ltoreq.1.18.

The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.02 and less than or equal to 0.18, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 9/TTL. ltoreq.0.15.

In the present embodiment, the object-side surface of the sixth lens element L6 is convex at the paraxial region.

The focal length f6 of the sixth lens L6 satisfies the following relation: 47.96 ≦ f6/f ≦ 51.57, which allows better imaging quality and lower sensitivity of the system through a reasonable distribution of powers. Preferably-29.97. ltoreq. f 6/f. ltoreq.41.25.

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: 25.91 ≦ (R11+ R12)/(R11-R12) ≦ 21.15, 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, -16.19 ≦ (R11+ R12)/(R11-R12). ltoreq.16.92.

The on-axis thickness of the sixth lens L6 is d11, and satisfies the following relation: d11/TTL is more than or equal to 0.04 and less than or equal to 0.12, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 11/TTL. ltoreq.0.09.

In the present embodiment, the image-side surface of the seventh lens L7 is concave in the 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: -10.12 ≦ (R13+ R14)/(R13-R14) ≦ 2.58, and the shape of the seventh lens L7 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, -6.33 ≦ (R13+ R14)/(R13-R14). ltoreq.2.06.

The seventh lens L7 has an on-axis thickness d13, and satisfies the following relationship: d13/TTL is more than or equal to 0.04 and less than or equal to 0.19, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 13/TTL. ltoreq.0.15.

In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 7.92 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 7.56 millimeters.

In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.32 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 2.28 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.

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.

Table 1 shows 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, A16, A18, A20 are aspheric coefficients.

y＝(x²/R)/[1+{1-(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶+A18x¹⁸+A20x²⁰ (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	Position of reverse curvature 3
					P1R1	1	0.655
P1R2	1	0.335
					P2R1	1	0.615
P2R2	2	0.125	0.925
					P3R1	2	0.675	1.025
P3R2	1	1.115
					P4R1	1	0.925
P4R2	3	0.415	0.885	1.175
					P5R1	2	0.535	0.945
P5R2	1	1.035
					P6R1	1	1.605
P6R2	0
					P7R1	2	0.285	1.715
P7R2	2	0.625	2.475

[ TABLE 4 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	1.355
P1R2	1	0.605
				P2R1	1	0.965
P2R2	2	0.205	1.095
				P3R1	0
P3R2	0
				P4R1	0
P4R2	0
				P5R1	0
P5R2	1	1.255
				P6R1	0
P6R2	0
				P7R1	1	0.495
P7R2	1	1.275

Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 555nm, and 470nm, respectively, after passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.

Table 17 shown later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1, 2, 3, and 4.

As shown in table 17, the first embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.951mm, a full field height of 3.25mm, a maximum field angle of 100.20 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(second embodiment)

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

Table 5 shows 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	0.645
P1R2	1	1.225
				P2R1	1	0.995
P2R2	0
				P3R1	0
P3R2	0
				P4R1	1	0.905
P4R2	2	0.165	0.795
				P5R1	2	0.045	0.875
P5R2	1	1.145
				P6R1	1	0.035
P6R2	1	1.775
				P7R1	1	1.355
P7R2	2	0.465	2.335

[ TABLE 8 ]

Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 555nm, and 470nm, 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 17, the second embodiment satisfies each conditional expression.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.356mm, a full field image height of 3.25mm, a maximum field angle of 120.01 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

(third embodiment)

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

Table 9 shows 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 stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[ TABLE 11 ]

[ TABLE 12 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	0
P1R2	0
				P2R1	1	0.315
P2R2	2	0.385	0.775
				P3R1	0
P3R2	0
				P4R1	0
P4R2	0
				P5R1	0
P5R2	0
				P6R1	1	0.095
P6R2	1	0.905
				P7R1	2	1.185	2.265
P7R2	1	1.545

Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 555nm, and 470nm, respectively, after passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 30 according to the third embodiment.

Table 17 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.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.975mm, a full field image height of 3.25mm, a maximum field angle of 134.74 °, 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.

Table 13 shows 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 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	1	0.825
P1R2	2	0.475	1.225
				P2R1	1	0.665
P2R2	1	0.515
				P3R1	0
P3R2	0
				P4R1	1	0.935
P4R2	1	0.955
				P5R1	1	0.935
P5R2	1	0.615
				P6R1	1	0.565
P6R2	1	0.935
				P7R1	2	0.205	1.505
P7R2	2	0.625	2.415

[ TABLE 16 ]

	Number of stagnation points	Location of stagnation 1	Location of stagnation 2
				P1R1	1	1.735
P1R2	1	0.825
				P2R1	1	1.055
P2R2	1	0.945
				P3R1	0
P3R2	0
				P4R1	0
P4R2	0
				P5R1	0
P5R2	1	0.985
				P6R1	1	1.055
P6R2	1	1.775
				P7R1	2	0.355	2.075
P7R2	1	1.275

Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 555nm, and 470nm, 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.

In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.659mm, a full field image height of 3.25mm, a maximum field angle of 100.16 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.

[ TABLE 17 ]

Parameter and condition formula	Example 1	Example 2	Example 3	Example 4
					f	3.387	2.909	2.199	3.458
f1	-20.039	-4.324	-2.933	-10.571
					f2	98.023	11.855	179.347	15.480
f3	5.955	2.533	3.917	2.581
					f4	-3.421	-11.635	-21.976	-6.915
f5	2.405	4.730	2.439	-100.351
					f6	-81.214	100.000	-3.396	13.355
f7	-6.791	-2.811	10.982	-5.959
					f12	-25.796	-7.001	-2.991	-37.878
FNO	1.74	2.15	2.26	2.09
					FOV	100.21°	120.01°	134.74°	100.16°
f4/f	-1.01	-4.00	-10.00	-2.00
					f7/f	-2.01	-0.97	5.00	-1.72
(R3+R4)/(R3-R4)	-3.51	-5.00	-10.00	-9.00

FNO is the number of the diaphragm F of the shooting optical lens;

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

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. An imaging optical lens, 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 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 maximum field angle of the imaging optical lens is FOV, the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the fourth lens is f4, the focal length of the seventh lens is f7, the curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, and the image-side surface of the seventh lens is concave along the paraxial region;

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 thickness of the seventh lens is d13, and the total optical length of the photographic optical lens is TTL;

the following relation is satisfied:

100.00°≤FOV≤135.00°；

-10.00≤f4/f≤-1.00；

-2.00≤f7/f≤5.00；

-10.00≤(R3+R4)/(R3-R4)≤-3.50；

-11.83≤f1/f≤-0.89；

3.26≤f2/f≤97.88；

-6.33≤(R13+R14)/(R13-R14)≤2.06；

0.06≤d13/TTL≤0.15。

2. the image-capturing optical lens of claim 1, wherein the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, and the on-axis thickness of the first lens is d1, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:

-11.64≤(R1+R2)/(R1-R2)≤1.77；

0.03≤d1/TTL≤0.22。

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

-7.40≤f1/f≤-1.11；

-7.27≤(R1+R2)/(R1-R2)≤1.42；

0.04≤d1/TTL≤0.17。

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

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

0.02≤d3/TTL≤0.14。

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

0.03≤d3/TTL≤0.11。

6. the imaging optical lens of claim 1, wherein the object-side surface and the image-side surface of the third lens element are convex along the paraxial region;

0.37≤f3/f≤2.67；

-0.53≤(R5+R6)/(R5-R6)≤0.31；

0.03≤d5/TTL≤0.19。

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

0.60≤f3/f≤2.14；

-0.33≤(R5+R6)/(R5-R6)≤0.25；

0.05≤d5/TTL≤0.15。

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

-3.85≤(R7+R8)/(R7-R8)≤15.33；

0.02≤d7/TTL≤0.09。

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

-2.41≤(R7+R8)/(R7-R8)≤12.26；

0.04≤d7/TTL≤0.07。

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

-58.05≤f5/f≤2.44；

-26.04≤(R9+R10)/(R9-R10)≤1.48；

0.02≤d9/TTL≤0.18。

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

-36.28≤f5/f≤1.95；

-16.27≤(R9+R10)/(R9-R10)≤1.18；

0.04≤d9/TTL≤0.15。

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

-47.96≤f6/f≤51.57；

-25.91≤(R11+R12)/(R11-R12)≤21.15；

0.04≤d11/TTL≤0.12。

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

-29.97≤f6/f≤41.25；

-16.19≤(R11+R12)/(R11-R12)≤16.92；

0.06≤d11/TTL≤0.09。

14. a camera optical lens according to claim 1, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 7.92 mm.

15. A camera optical lens according to claim 14, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 7.56 mm.

16. The imaging optical lens according to claim 1, characterized in that an aperture F-number of the imaging optical lens is less than or equal to 2.32.

17. A camera optical lens according to claim 16, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.28.