1. The wide-angle lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens and a fourth lens in sequence from an object side to an image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;

the first lens has negative diopter, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens has positive diopter, and the object side surface of the second lens is a concave surface and the image side surface of the second lens is a convex surface;

the third lens has negative diopter, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;

the fourth lens has positive diopter, and the object side surface and the image side surface of the fourth lens are convex surfaces;

the fifth lens has negative diopter, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;

the sixth lens has positive diopter, and the object side surface and the image side surface of the sixth lens are convex surfaces;

the seventh lens has negative diopter, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface;

the optical imaging lens only has the seven lenses with the refractive indexes;

and the lens satisfies: (FOV x f)/h is more than or equal to 70, wherein FOV is the angle of view of the lens, f is the focal length value of the whole lens, and h is the designed image height of the lens.

2. A wide-angle lens as claimed in claim 1, characterized in that the following condition is satisfied: 0 < | f1/f2| < 1, where f1 is the focal length value of the first lens and f2 is the focal length value of the second lens.

3. The wide-angle lens of claim 1, wherein the first lens and the second lens are crescent aspheric lenses.

4. A wide-angle lens as claimed in claim 1, characterized in that the following condition is satisfied: vd1-Vd2 is more than 30, wherein Vd is the Abbe coefficient of the first lens, and Vd2 is the Abbe coefficient of the second lens.

5. A wide-angle lens as claimed in claim 1, characterized in that the following condition is satisfied: vd4-Vd5 is more than 30, and Vd4 is more than 60, wherein Vd4 is the Abbe coefficient of the fourth lens, and Vd5 is the Abbe coefficient of the fifth lens.

6. The wide-angle lens of claim 1, further comprising an aperture stop disposed between the fourth lens and the fifth lens.

7. The wide-angle lens as claimed in claim 1, wherein the fourth lens is a glass aspheric lens, and the remaining lenses are plastic aspheric lenses.

8. A wide-angle lens as claimed in claim 1, characterized in that the following condition is satisfied: TTL/h is less than or equal to 3, wherein TTL is the distance between the first lens and the imaging surface on the optical axis.

9. A wide-angle lens as claimed in claim 8, characterized in that the following condition is satisfied: TTL is less than 13 mm.

Background

With the continuous progress of science and technology and the continuous development of society, in recent years, the optical imaging lens is also rapidly developed, and the optical imaging lens is widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, machine vision systems and the like. However, the wide-angle lens in the current market has at least the following disadvantages:

1. the resolution of a wide-angle lens is not high in general, and the resolution is worse particularly in the edge area.

2. The chromatic aberration of a general wide-angle lens is large, especially in an edge area, the chromatic aberration is difficult to control, and purple fringing is easily caused.

3. The general wide-angle lens has large volume and long total length, which is not beneficial to the miniaturization of the lens.

4. The CRA of a general wide-angle lens is small, and is not matched with the existing sensor, so that color cast is easily caused.

Disclosure of Invention

It is an object of the present invention to provide a wide-angle lens to solve at least one of the above problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side in sequence along an optical axis, wherein the first lens, the second lens and the fourth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;

the first lens has negative diopter, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens has positive diopter, and the object side surface of the second lens is a concave surface and the image side surface of the second lens is a convex surface;

the third lens has negative diopter, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;

the fourth lens has positive diopter, and the object side surface and the image side surface of the fourth lens are convex surfaces;

the fifth lens has negative diopter, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;

the sixth lens has positive diopter, and the object side surface and the image side surface of the sixth lens are convex surfaces;

the seventh lens has negative diopter, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface;

the optical imaging lens only has the seven lenses with the refractive indexes;

and the lens satisfies: (FOV x f)/h is more than or equal to 70, wherein FOV is the angle of view of the lens, f is the focal length value of the whole lens, and h is the designed image height of the lens.

Preferably, the lens complies with the following conditional expression: 0 < | f1/f2| < 1, where f1 is the focal length value of the first lens and f2 is the focal length value of the second lens.

Preferably, the first lens and the second lens are both crescent aspheric lenses.

Preferably, the lens complies with the following conditional expression: vd1-Vd2 is more than 30, wherein Vd is the Abbe coefficient of the first lens, and Vd2 is the Abbe coefficient of the second lens.

Preferably, the lens complies with the following conditional expression: vd4-Vd5 is more than 30, and Vd4 is more than 60, wherein Vd4 is the Abbe coefficient of the fourth lens, and Vd5 is the Abbe coefficient of the fifth lens.

Preferably, the lens barrel further comprises a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth lens.

Preferably, the fourth lens is a glass aspheric lens, and the rest lenses are plastic aspheric lenses.

Preferably, the lens complies with the following conditional expression: TTL/h is less than or equal to 3, wherein TTL is the distance between the first lens and the imaging surface on the optical axis.

Preferably, the lens complies with the following conditional expression: TTL is less than 13 mm.

After adopting the technical scheme, compared with the background technology, the invention has the following advantages:

1. the invention adopts seven lenses along the direction from the object side to the image side, and the arrangement design is carried out on the refractive index and the surface type of each lens, the MTF value is still larger than 0.4 when the spatial frequency of the lens reaches 113lp/mm, the control on a transfer function is good, the resolution is high, the lens has high resolution, and compared with the lens with the same specification focal length, the lens has wider visual field.

2. The invention adopts 436nm-656nm visible broad spectrum design, the later color is controlled within 4um, the color reducibility of the image is good, and the blue-violet side color difference of the picture can not occur.

3. The TTL of the lens is less than 13mm, and compared with other lenses, the TTL of the lens under the same imaging plane is shorter, so that the whole lens is small in size and compact in structure, conforms to the trend of miniaturization of the current flat lens, and can be better suitable for various application places.

4. The CRA of the lens is more than 32 degrees, the curve matching degree with the CRA of the sensor is within +/-2 degrees, and the problem of color cast or low edge illumination of the lens is solved.

Drawings

FIG. 1 is an optical block diagram of the present invention;

FIG. 2 is a graph of MTF of the lens according to the first embodiment under the condition of 436nm-656nm visible light;

FIG. 3 is a graph of field curvature and distortion under 546nm in a lens according to an embodiment;

FIG. 4 is a graph of lateral chromatic aberration of the lens in the first embodiment under the condition of 436nm-656nm of visible light;

FIG. 5 is a graph of MTF of the lens of example two under the condition of 436nm-656nm visible light;

FIG. 6 is a graph of the field curvature and distortion under 546nm in a second embodiment;

FIG. 7 is a lateral chromatic aberration curve of the lens of the second embodiment under the condition of 436nm-656nm of visible light;

FIG. 8 is a graph of MTF of the lens of the third embodiment in the range of 436nm to 656 nm;

FIG. 9 is a graph of field curvature and distortion under 546nm in a third embodiment;

FIG. 10 is a graph of lateral chromatic aberration of the lens of the third embodiment in the visible light range of 436nm-656 nm;

FIG. 11 is a graph of MTF of the lens of the fourth embodiment in the visible light range from 436nm to 656 nm;

FIG. 12 is a graph of the field curvature and distortion under 546nm in the fourth embodiment;

FIG. 13 is a graph of lateral chromatic aberration of the lens of the fourth embodiment in the visible light range of 436nm-656 nm.

Description of reference numerals:

the lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a diaphragm 8 and a filter 9.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

In the present specification, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by the gauss theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.

The invention discloses a wide-angle lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the seventh lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;

the first lens has negative diopter, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens has positive diopter, and the object side surface of the second lens is a concave surface and the image side surface of the second lens is a convex surface;

the third lens has negative diopter, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;

the fourth lens has positive diopter, and the object side surface and the image side surface of the fourth lens are convex surfaces;

the fifth lens has negative diopter, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;

the sixth lens has positive diopter, and the object side surface and the image side surface of the sixth lens are convex surfaces;

the seventh lens has negative diopter, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface;

the optical imaging lens only has the seven lenses with the refractive indexes;

and the lens satisfies: (FOV multiplied by f)/h is more than or equal to 70, wherein FOV is the field angle of the lens, f is the focal length value of the whole lens, h is the designed image height of the lens, large-angle resolution can be realized, and a wider field angle can be realized in the same focal length section.

Preferably, the lens complies with the following conditional expression: 0 < | f1/f2| < 1, wherein f1 is the focal length value of the first lens, and f2 is the focal length value of the second lens, the focal power can be balanced, and the system performance can be improved.

Preferably, the first lens and the second lens are both crescent aspheric lenses, which can better correct distortion.

Preferably, the lens complies with the following conditional expression: vd1-Vd2 is more than 30, wherein Vd is the Abbe coefficient of the first lens, and Vd2 is the Abbe coefficient of the second lens, and the off-axis chromatic aberration can be corrected and the resolution can be improved by combining two high-low dispersion lenses.

Preferably, the lens complies with the following conditional expression: vd4-Vd5 > 30 and Vd4 > 60, wherein Vd4 is the Abbe coefficient of the fourth lens, Vd5 is the Abbe coefficient of the fifth lens, and the fourth lens and the fifth lens can help to eliminate the influence of chromatic aberration, reduce field curvature and correct coma aberration, and meanwhile, residual chromatic aberration is used for balancing the whole chromatic aberration of the optical system, so that the system is compact as a whole and meets the miniaturization requirement.

Preferably, the lens barrel further comprises a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth lens.

Preferably, the fourth lens is a glass aspheric lens, and the rest of the lenses are plastic aspheric lenses, and the aspheric lenses have the advantages of improving field curvature and astigmatism, so that the imaging quality of the lens is improved, the overall weight of the system is reduced, and the miniaturization of the lens is facilitated. The equation for the object-side and image-side curves of an aspheric lens is expressed as follows:

wherein:

z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);

c: the curvature of the aspheric vertex (the vertex curvature);

k: cone coefficient (Conic Constant);

radial distance;

r_n: normalized radius (normalysis radius (NRADIUS));

u：r/r_n；

a_m: mth order Q^conCoefficient (is the m)^thQ^concoefficient)；

Q_m ^con: mth order Q^conPolynomial (the m)^thQ^con polynomial)。

Preferably, the lens complies with the following conditional expression: the TTL/h is less than or equal to 3, wherein the TTL is the distance between the first lens and the imaging surface on the optical axis, the miniaturization of the optical lens can be realized, and the TTL is shorter under the same imaging surface compared with other lenses.

Preferably, the lens complies with the following conditional expression: TTL is less than 13 mm.

The wide-angle lens of the present invention will be described in detail below with specific embodiments.

Example one

Referring to fig. 1, the present embodiment discloses a wide-angle lens, which includes, in order from an object side a1 to an image side a2 along an optical axis, first to seventh lenses 1 to 7, wherein each of the first to seventh lenses 1 to 7 includes an object side surface facing to the object side a1 and allowing passage of imaging light and an image side surface facing to the image side a2 and allowing passage of imaging light;

the first lens 1 has negative diopter, and the object side surface of the first lens 1 is a convex surface and the image side surface is a concave surface;

the second lens element 2 has a positive refractive power, and the object-side surface of the second lens element 2 is a concave surface and the image-side surface is a convex surface;

the third lens 3 has negative diopter, and the object side surface of the third lens 3 is a convex surface and the image side surface is a concave surface;

the fourth lens 4 has positive diopter, and the object side surface and the image side surface of the fourth lens 4 are convex surfaces;

the fifth lens 5 has a negative diopter, and the object-side surface of the fifth lens 5 is a convex surface and the image-side surface is a concave surface;

the sixth lens element 6 has a positive refractive power, and an object-side surface and an image-side surface of the sixth lens element 6 are convex surfaces;

the seventh lens element 7 has a negative refractive power, and an object-side surface of the seventh lens element 7 is a concave surface and an image-side surface thereof is a convex surface;

the optical imaging lens only has the seven lenses with the refractive indexes; and the lens satisfies: (FOV x f)/h is more than or equal to 70, wherein FOV is the angle of view of the lens, f is the focal length value of the whole lens, and h is the designed image height of the lens.

The diaphragm 8 is arranged between the fourth lens 4 and the fifth lens 5, the fourth lens 4 is a glass aspheric lens, and the rest lenses are plastic aspheric lenses.

Detailed optical data of this embodiment are shown in table 1.

Table 1 detailed optical data of example one

Surface of		Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
								0	Shot object surface	Infinity	Infinity
1	First lens	-10.988	1.207	Plastic material	1.535037	55.7107	-3.98
								2		2.755	2.244
3	Second lens	-7.020	2.719	Plastic material	1.639729	23.5288	5.52
								4		-2.726	0.312
5	Third lens	39.536	0.648	Plastic material	1.661417	20.4122	-13.64
								6		7.366	0.086
7	Fourth lens	4.439	1.452	Glass	1.496997	81.6084	3.48
								8		-2.533	0.114
9	STO	Infinity	0.096
								10	Fifth lens element	6.972	0.382	Plastic material	1.661	20.412	-2.95
11		1.504	0.045
								12	Sixth lens element	2.120	1.286	Plastic material	1.535037	55.7107	3.02
13		-5.452	0.525
								14	Seventh lens element	4.231	0.863	Plastic material	1.535037	55.7107	-15.12
15		2.584	0.299
								16	Optical filter	Infinity	0.210	Glass	1.516798	64.1983	Infinity
17		Infinity	0.495
								18	Image plane	Infinity

For detailed data of the aspheric surfaces of the first lens 1 to the seventh lens 7, refer to the following table:

surface of

K

A4

A6

A8

A10

A12

A14

A16

1

3.59E-03

-8.68E-05

1.23E-06

-4.25E-09

1.20E-12

2

-1.51E-02

-1.18E-02

9.51E-04

-3.98E-06

-3.80E-08

3

2.00E-01

-1.86E-02

4.05E-03

-4.66E-04

2.27E-05

4

-1.86E-04

2.72E-02

-4.69E-03

1.19E-03

-1.58E-04

1.11E-05

5

-5.65E+01

7.30E-03

3.87E-03

-3.56E-03

3.13E-03

-1.27E-03

2.83E-04

-2.47E-05

6

-9.93E+01

-1.41E-02

1.26E-02

4.17E-03

-1.36E-02

1.19E-02

-4.59E-03

7.71E-04

7

-1.71E-01

-3.88E-02

4.07E-02

-3.89E-02

1.59E-02

-2.11E-03

8

7.33E-02

9.00E-02

-1.01E-01

7.59E-02

-3.31E-02

6.08E-03

9

10

4.97E+01

-7.42E-02

9.85E-02

-3.36E-01

5.16E-01

-3.19E-01

11

3.19E-02

-2.62E-01

4.84E-01

-9.52E-01

9.58E-01

-3.91E-01

12

1.94E+00

-1.26E-01

4.00E-01

-8.31E-01

7.62E-01

-2.79E-01

13

-4.87E+01

-3.16E-02

7.23E-02

-1.22E-02

-1.01E-03

2.86E-05

14

-2.98E+01

-8.88E-02

2.65E-02

-4.76E-03

5.80E-04

-5.67E-06

15

-1.32E-01

-9.63E-02

2.38E-02

-5.79E-03

8.15E-04

-5.42E-05

-6.01E-08

16

17

18

In this specific embodiment, the focal length f of the lens is 1.69mm, f1/f2 is = -0.72, the clear light FNO =2.3, the field angle FOV =136 °, the target surface size IMH =5.88mm, the total optical length TTL =12.98mm, the CRA > 32 °, and the matching degree with the CRA curve of the sensor ± 2 °.

Please refer to fig. 2, it can be seen that the MTF curve of the lens under the 436nm-656nm visible light has good control over the function, high resolution, and the MTF value is still greater than 0.4 when the spatial frequency of the lens reaches 113lp/mm, so as to meet the requirement of image definition. Referring to fig. 3, it can be seen that the optical distortion is controlled at about-30%, and the distortion of the image is small. Please refer to fig. 4, which shows that the later color is smaller than 4um in the visible 436nm-656nm wide spectral band, which ensures that the blue-violet side color difference does not occur on the picture and the color reducibility of the image is good.

Example two

As shown in fig. 5 to 7, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.

The detailed optical data of this embodiment are shown in table 2.

Table 2 detailed optical data of example two

Surface of		Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
								0	Shot object surface	Infinity	Infinity
1	First lens	-10.926	1.198	Plastic material	1.535037	55.7107	-3.96
								2		2.742	2.238
3	Second lens	-6.976	2.685	Plastic material	1.639729	23.5288	5.47
								4		-2.701	0.310
5	Third lens	40.270	0.649	Plastic material	1.661417	20.4122	-13.36
								6		7.268	0.087
7	Fourth lens	4.379	1.449	Glass	1.496997	81.6084	3.44
								8		-2.503	0.112
9	STO	Infinity	0.102
								10	Fifth lens element	7.060	0.386	Plastic material	1.661	20.412	-2.90
11		1.488	0.043
								12	Sixth lens element	2.123	1.286	Plastic material	1.535037	55.7107	3.00
13		-5.298	0.538
								14	Seventh lens element	4.255	0.854	Plastic material	1.535037	55.7107	-14.77
15		2.576	0.296
								16	Optical filter	Infinity	0.210	Glass	1.516798	64.1983	Infinity
17		Infinity	0.490
								18	Image plane	Infinity

For detailed data of the aspheric surfaces of the first lens 1 to the seventh lens 7, refer to the following table:

surface of

K

A4

A6

A8

A10

A12

A14

A16

1

3.58E-03

-8.72E-05

1.24E-06

-4.22E-09

-5.81E-13

2

-1.40E-02

-1.16E-02

9.58E-04

-3.30E-06

8.85E-08

2.51E-08

3

1.89E-01

-1.84E-02

4.01E-03

-4.71E-04

2.34E-05

-6.15E-10

4

-3.62E-04

2.75E-02

-4.75E-03

1.19E-03

-1.57E-04

1.11E-05

5

-6.97E+01

7.18E-03

3.91E-03

-3.53E-03

3.08E-03

-1.27E-03

2.86E-04

-2.51E-05

6

-9.91E+01

-1.40E-02

1.26E-02

4.16E-03

-1.37E-02

1.20E-02

-4.64E-03

7.80E-04

7

-2.16E-01

-3.87E-02

4.04E-02

-3.87E-02

1.59E-02

-2.12E-03

8

2.20E-02

8.94E-02

-1.01E-01

7.64E-02

-3.35E-02

6.13E-03

9

10

4.90E+01

-7.55E-02

9.87E-02

-3.33E-01

5.17E-01

-3.20E-01

6.91E-03

11

3.60E-02

-2.64E-01

4.80E-01

-9.55E-01

9.62E-01

-3.93E-01

-3.01E-03

12

1.93E+00

-1.24E-01

3.99E-01

-8.31E-01

7.54E-01

-2.76E-01

-1.17E-03

13

-4.89E+01

-3.17E-02

7.29E-02

-1.21E-02

-1.06E-03

-4.28E-06

2.02E-05

14

-2.93E+01

-8.85E-02

2.66E-02

-4.81E-03

5.80E-04

-4.89E-06

-3.28E-07

15

-1.08E-01

-9.85E-02

2.34E-02

-5.76E-03

8.16E-04

-5.43E-05

-2.48E-08

16

17

18

In this specific embodiment, the focal length f of the lens is 1.69mm, f1/f2 is = -0.72, the clear light FNO =2.3, the field angle FOV =136 °, the target surface size IMH =5.88mm, the total optical length TTL =12.93mm, the CRA > 32 °, and the matching degree with the CRA curve of the sensor is ± 2 °.

Please refer to fig. 5, which shows that the MTF curve of the lens under the 436nm-656nm visible light has good control over the function, high resolution, and the MTF value is still greater than 0.4 when the spatial frequency of the lens reaches 113lp/mm, thereby satisfying the requirement of image definition. Referring to fig. 6, it can be seen that the optical distortion is controlled at about-30%, and the distortion of the image is small. Please refer to fig. 7, which shows that the later color is smaller than 4um in the visible 436nm-656nm wide spectral band, so as to ensure that the blue-violet side color difference does not occur on the picture and the color reducibility of the image is good.

EXAMPLE III

As shown in fig. 8 to 10, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.

The detailed optical data of this embodiment are shown in table 3.

Table 3 detailed optical data of example three

Surface of		Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
								0	Shot object surface	Infinity	Infinity
1	First lens	-10.941	1.195	Plastic material	1.535037	55.7107	-3.96
								2		2.741	2.236
3	Second lens	-6.975	2.684	Plastic material	1.639729	23.5288	5.47
								4		-2.701	0.309
5	Third lens	40.377	0.649	Plastic material	1.661417	20.4122	-13.34
								6		7.260	0.087
7	Fourth lens	4.380	1.448	Glass	1.496997	81.6084	3.44
								8		-2.503	0.112
9	STO	Infinity	0.101
								10	Fifth lens element	7.062	0.386	Plastic material	1.661	20.412	-2.90
11		1.488	0.042
								12	Sixth lens element	2.123	1.287	Plastic material	1.535037	55.7107	3.00
13		-5.294	0.539
								14	Seventh lens element	4.262	0.855	Plastic material	1.535037	55.7107	-14.66
15		2.572	0.296
								16	Optical filter	Infinity	0.210	Glass	1.516798	64.1983	Infinity
17		Infinity	0.491
								18	Image plane	Infinity

For detailed data of the aspheric surfaces of the first lens 1 to the seventh lens 7, refer to the following table:

surface of

K

A4

A6

A8

A10

A12

A14

A16

1

3.58E-03

-8.72E-05

1.24E-06

-4.24E-09

-1.66E-12

2

-1.39E-02

-1.16E-02

9.58E-04

-3.20E-06

1.22E-07

2.85E-08

3

1.88E-01

-1.84E-02

4.01E-03

-4.71E-04

2.34E-05

1.90E-09

4

-3.95E-04

2.75E-02

-4.75E-03

1.19E-03

-1.57E-04

1.11E-05

5

-7.05E+01

7.18E-03

3.91E-03

-3.53E-03

3.08E-03

-1.27E-03

2.86E-04

-2.51E-05

6

-9.92E+01

-1.40E-02

1.26E-02

4.16E-03

-1.37E-02

1.20E-02

-4.64E-03

7.80E-04

7

-2.12E-01

-3.87E-02

4.04E-02

-3.87E-02

1.59E-02

-2.12E-03

8

2.21E-02

8.94E-02

-1.01E-01

7.63E-02

-3.36E-02

6.19E-03

9

10

4.90E+01

-7.55E-02

9.86E-02

-3.34E-01

5.17E-01

-3.20E-01

7.91E-03

11

3.64E-02

-2.64E-01

4.80E-01

-9.54E-01

9.62E-01

-3.93E-01

-8.17E-03

12

1.93E+00

-1.24E-01

3.99E-01

-8.31E-01

7.55E-01

-2.77E-01

-5.30E-03

13

-4.88E+01

-3.17E-02

7.29E-02

-1.21E-02

-1.06E-03

-1.16E-05

4.18E-05

14

-2.92E+01

-8.85E-02

2.66E-02

-4.81E-03

5.81E-04

-4.79E-06

-3.34E-07

15

-1.08E-01

-9.83E-02

2.35E-02

-5.76E-03

8.16E-04

-5.43E-05

-3.04E-08

16

17

18

In this specific embodiment, the focal length f of the lens is 1.69mm, f1/f2 is = -0.72, the clear light FNO =2.3, the field angle FOV =136 °, the target surface size IMH =5.88mm, the total optical length TTL =12.93mm, the CRA > 32 °, and the matching degree with the CRA curve of the sensor is ± 2 °.

Please refer to fig. 8, it can be seen that the MTF curve of the lens under the 436nm-656nm visible light is well controlled for the lens, the resolution is high, and when the spatial frequency of the lens reaches 113lp/mm, the MTF value is still larger than 0.4, which satisfies the requirement of the image definition. Referring to fig. 9, it can be seen that the optical distortion is controlled at about-30%, and the distortion of the image is small. Please refer to fig. 10 for a vertical axis chromatic aberration diagram of a lens under 436nm-656nm visible light, and it can be seen from the diagram that a later color is less than 4um in a visible 436nm-656nm wide spectral band, so as to ensure that blue-violet side chromatic aberration does not occur on the picture and the color reducibility of the image is good.

Example four

As shown in fig. 11 to 13, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.

The detailed optical data of this embodiment are shown in table 4.

Table 4 detailed optical data for example four

Surface of		Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
								0	Shot object surface	Infinity	Infinity
1	First lens	-10.963	1.193	Plastic material	1.535037	55.7107	-3.96
								2		2.738	2.239
3	Second lens	-6.976	2.682	Plastic material	1.639729	23.5288	5.47
								4		-2.701	0.309
5	Third lens	40.651	0.648	Plastic material	1.661417	20.4122	-13.31
								6		7.258	0.087
7	Fourth lens	4.381	1.447	Glass	1.496997	81.6084	3.44
								8		-2.502	0.112
9	STO	Infinity	0.100
								10	Fifth lens element	7.065	0.386	Plastic material	1.661	20.412	-2.90
11		1.489	0.041
								12	Sixth lens element	2.124	1.290	Plastic material	1.535037	55.7107	3.00
13		-5.292	0.539
								14	Seventh lens element	4.266	0.857	Plastic material	1.535037	55.7107	-14.39
15		2.556	0.297
								16	Optical filter	Infinity	0.210	Glass	1.516798	64.1983	Infinity
17		Infinity	0.492
								18	Image plane	Infinity

For detailed data of the aspheric surfaces of the first lens 1 to the seventh lens 7, refer to the following table:

surface of

K

A4

A6

A8

A10

A12

A14

A16

1

3.58E-03

-8.72E-05

1.25E-06

-4.25E-09

-2.88E-12

2

-1.38E-02

-1.16E-02

9.57E-04

-3.20E-06

1.87E-07

3.94E-08

3

1.87E-01

-1.84E-02

4.01E-03

-4.71E-04

2.34E-05

2.90E-09

4

-5.28E-04

2.75E-02

-4.75E-03

1.19E-03

-1.57E-04

1.11E-05

5

-7.26E+01

7.18E-03

3.91E-03

-3.53E-03

3.08E-03

-1.27E-03

2.86E-04

-2.51E-05

6

-9.92E+01

-1.40E-02

1.26E-02

4.16E-03

-1.37E-02

1.20E-02

-4.64E-03

7.79E-04

7

-2.09E-01

-3.87E-02

4.04E-02

-3.87E-02

1.59E-02

-2.13E-03

8

2.20E-02

8.94E-02

-1.01E-01

7.62E-02

-3.37E-02

6.36E-03

9

10

4.90E+01

-7.55E-02

9.85E-02

-3.34E-01

5.16E-01

-3.20E-01

9.45E-03

11

3.71E-02

-2.64E-01

4.81E-01

-9.54E-01

9.63E-01

-3.93E-01

-1.51E-02

12

1.93E+00

-1.24E-01

4.00E-01

-8.30E-01

7.55E-01

-2.77E-01

-8.21E-03

13

-4.84E+01

-3.17E-02

7.29E-02

-1.22E-02

-1.11E-03

-2.55E-05

8.30E-05

14

-2.94E+01

-8.85E-02

2.66E-02

-4.81E-03

5.82E-04

-4.84E-06

-4.47E-07

15

-1.13E-01

-9.83E-02

2.35E-02

-5.75E-03

8.16E-04

-5.44E-05

-4.78E-08

16

17

18

In this specific embodiment, the focal length f of the lens is 1.70mm, f1/f2 is = -0.72, the clear light FNO =2.3, the field angle FOV =136 °, the target surface size IMH =5.90mm, the total optical length TTL =12.93mm, the CRA > 32 °, and the matching degree with the CRA curve of the sensor is ± 2 °.

Please refer to fig. 11, which shows that the MTF curve of the lens under the 436nm-656nm visible light has good control over the function, high resolution, and the MTF value is still greater than 0.4 when the spatial frequency of the lens reaches 113lp/mm, thereby satisfying the requirement of image definition. Referring to fig. 12, it can be seen that the optical distortion is controlled at about-30%, and the distortion of the image is small. Please refer to fig. 13, which shows that the later color is smaller than 4um in the visible 436nm-656nm wide spectral band, so as to ensure that the blue-violet side color difference does not occur on the picture and the color reducibility of the image is good.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.