CN218956904U - Optical lens - Google Patents

Abstract

An optical lens of the present utility model sequentially includes, in a direction from an object side to an image side along an optical axis: a first lens (L1) with negative focal power, a second lens (L2), a third lens (L3) with positive focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with negative focal power, a sixth lens (L6) with positive focal power, a seventh lens (L7) with negative focal power and a protective sheet glass (CG), wherein the second lens (L2) is a convex-concave lens, and the center thickness dn of an nth lens with the largest center thickness and the center thickness dm of an mth lens with the smallest center thickness satisfy the following relation: and dn/dm is more than or equal to 2.9 and less than or equal to 5.4. The optical lens provided by the utility model is provided with seven lenses, has the characteristics of simple structure and low cost, and has the characteristics of large aperture, low cost and miniaturization and can meet the use requirements of high-low temperature environments while meeting the requirements of the optical lens on high resolution.

Description

Optical lens

Technical Field

The utility model relates to the field of optical imaging, in particular to a high-resolution and miniaturized optical lens.

Background

With the continuous progress of science and technology and the continuous development of society, in recent years, an optical imaging lens has also been rapidly developed and widely applied to various fields such as intelligent transportation, video conference, vehicle-mounted monitoring, security monitoring and the like, so that the requirements for the optical lens are also higher and higher. Due to the high-speed development of automobile auxiliary driving systems in recent years, optical lenses are increasingly widely used in automobiles, but the existing vehicle-mounted lenses have at least the following defects:

1. in order to improve the resolution of the existing vehicle-mounted lens, a mode of increasing the number of lenses is generally adopted, so that the cost is increased to a certain extent, and the miniaturization characteristic of the lens is seriously affected;

2. the imaging performance of the lens is unstable in various severe environments and under large temperature differences, and the relative illuminance of a common vehicle-mounted lens is low and the imaging is uneven;

3. most vehicle-mounted lenses in the market cannot well ensure clear imaging in high and low temperature environments;

4. the traditional vehicle-mounted lens has large caliber, a large number of lenses and high cost, and is not beneficial to the wide application of the system;

5. at present, the market is in need of an optical lens with high resolution, miniaturization, large aperture, low cost and the like, and stable performance in a high-low temperature environment so as to meet the requirement of in-vehicle monitoring.

Disclosure of Invention

The present utility model has been made to solve the above problems, and an object of the present utility model is to provide an optical lens which has a high resolution (6M), is compact, has a large angle of view, a large aperture, a small total length, and is inexpensive, and is suitable for use in high and low temperature environments.

In order to achieve the above object, the present utility model provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens with negative focal power, a second lens, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power and a protective flat glass, wherein the second lens is a convex-concave lens, and the fifth lens is a biconcave lens;

the center thickness dn of the nth lens having the largest center thickness among the first to seventh lenses and the center thickness dm of the mth lens having the smallest center thickness satisfy the following relationship: and dn/dm is more than or equal to 2.9 and less than or equal to 5.4.

According to an aspect of the present utility model, in a direction from an object side to an image side along an optical axis, the first lens is a convex-concave type lens, an image side surface of the third lens is a convex surface, the fourth lens is a biconvex type lens, the sixth lens is a biconvex type lens, and the seventh lens is a convex-concave type lens.

According to one aspect of the present utility model, at least one inflection point is disposed on the image side of the seventh lens element.

According to one aspect of the present utility model, the radius of curvature R1 of the object side surface and the radius of curvature R2 of the image side surface of the first lens satisfy the following relationship: R1/R2 is more than or equal to 2.4 and less than or equal to 17.0.

According to one aspect of the present utility model, the effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy the following relationship: -2.9.ltoreq.F1/F.ltoreq.1.0.

According to one aspect of the present utility model, the effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy the following relationship: 2.3 is less than or equal to |F2/F is less than or equal to 7.4.

According to one aspect of the utility model, the effective focal length F3 of the third lens and the effective focal length F of the optical lens satisfy the following relationship 1.3.ltoreq.F3/F.ltoreq.4.1.

According to one aspect of the present utility model, the effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy the following relationship: F4/F is less than or equal to 1.3 and less than or equal to 2.5.

According to one aspect of the present utility model, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy the following relationship: F5/F6 is less than or equal to-1.6 and less than or equal to-0.6;

the effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy the following relationship: -5.4.ltoreq.F7/F.ltoreq.2.5.

According to one aspect of the present utility model, the effective focal length F1 of the first lens and the effective focal length F4 of the fourth lens satisfy the following relationship: -2.0.ltoreq.F1/F4.ltoreq.0.4;

the effective focal length F4 of the fourth lens and the effective focal length F7 of the seventh lens satisfy the following relationship: F4/F7 is less than or equal to-1.0 and less than or equal to-0.2.

According to one aspect of the present utility model, the total optical length TLL of the optical lens and the total image height IH of the optical lens satisfy the following relationship: TTL/IH is less than or equal to 1.8 and less than or equal to 1.9.

According to one aspect of the present utility model, the optical total length TLL of the optical lens and the back focal length BFL of the optical lens satisfy the following relationship: BFL/TTL is more than or equal to 0 and less than or equal to 0.3.

According to one aspect of the present utility model, the center thickness d4 of the fourth lens and the center thickness d6 of the sixth lens satisfy the following relationship: d4/d6 is more than or equal to 0.7 and less than or equal to 1.4.

According to one aspect of the present utility model, a distance T67 between the center of the image side of the sixth lens element and the center of the object side of the seventh lens element on the optical axis satisfies the following relationship with the back focal length BFL of the optical lens element: T67/BFL is more than or equal to 0 and less than or equal to 0.1.

According to one aspect of the present utility model, the effective aperture SD21 of the object side surface of the second lens and the effective aperture SD31 of the object side surface of the third lens satisfy the following relationship: SD21/SD31 is more than or equal to 1.2 and less than or equal to 2.1.

According to one aspect of the present utility model, the abbe number Vd1 of the first lens and the abbe number Vd2 of the second lens satisfy the following relationship: the content of the |Vd1-Vd2| is less than or equal to 20 and less than or equal to 40.

According to the optical lens provided by the utility model, seven lenses are arranged, the optical lens has the characteristics of simple structure and low cost, the optical power of each lens is reasonably distributed, the shape of each lens is optimally arranged, and the optical lens has the characteristics of high resolving power (6M), large aperture (FNO less than or equal to 2.2), low cost and miniaturization (the total optical length is less than 14 mm) and meets the use requirements of high and low temperature environments.

Drawings

Fig. 1 is a schematic structural diagram of an optical lens according to embodiment 1 of the present utility model;

fig. 2 is a schematic structural diagram of an optical lens according to embodiment 2 of the present utility model;

fig. 3 is a schematic structural diagram of an optical lens in embodiment 3 of the present utility model;

fig. 4 is a schematic structural diagram of an optical lens in embodiment 4 of the present utility model.

Detailed Description

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

In describing embodiments of the present utility model, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer" and the like are used in terms of orientation or positional relationship based on that shown in the drawings, which are merely for convenience of description and to simplify the description, rather than to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus the above terms should not be construed as limiting the present utility model.

The present utility model will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present utility model are not limited to the following embodiments.

Fig. 1 is a block diagram schematically showing an optical lens according to an embodiment of the present utility model. As shown in fig. 1, the optical lens of the present utility model sequentially includes, along an optical axis from an object side to an image side: the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the protective sheet glass CG.

In the embodiment of the present utility model, preferably, the first lens L1 is a convex-concave lens with negative optical power, and by setting the first lens L1 to be in a meniscus shape facing the object, the light entering the optical system can be prevented from being excessively divergent, which is beneficial to controlling the rear aperture of the optical system, and realizing miniaturization of the optical lens; and can collect the light of large field of view as much as possible and get into the rear of the optical system, thus increase the light flux effectively.

In the embodiment of the present utility model, preferably, the second lens L2 is a convex-concave lens, and by setting the second lens L2 to be in a meniscus shape facing the object side, it is beneficial to further collect light, so that light with a large angle enters the optical system as much as possible, to improve illuminance of the rear optical system, and the image side surface of the second lens L2 is a concave surface, so that it is beneficial to reduce a distance between the first lens L1 and the second lens L2, shorten an overall length, and achieve miniaturization.

In the embodiment of the present utility model, preferably, the image side surface of the third lens L3 is convex and has positive optical power, and the third lens L3 can converge light rays of the front optical system, so that the diverging light rays smoothly enter the rear optical system, which is favorable for reducing the rear optical path, and realizing a shorter overall system length, thereby realizing miniaturization.

The second lens L2 is configured to have a meniscus shape protruding toward the object side, and the third lens L3 is configured to have a meniscus shape protruding toward the image side, which is beneficial to achieving the requirements of miniaturization and large field angle.

In the embodiment of the present utility model, preferably, the fourth lens L4 is a biconvex lens with positive optical power, and can further converge the light rays in the front optical system to shorten the total length of the optical system, and the fourth lens L4 and the third lens L3 are cooperatively disposed to facilitate miniaturization, large field angle and high resolution of the system.

In the embodiment of the present utility model, preferably, the fifth lens L5 is a biconcave lens with negative focal power, which can diverge the light collected by the fourth lens L4, and adjust the light trend, so as to reduce chromatic aberration and improve imaging quality.

In the embodiment of the present utility model, it is preferable that the sixth lens L6 is a biconvex lens having positive power, which is advantageous in smoothing the trend of the light emitted from the front lens, correcting astigmatism and field curvature, improving resolution, and the sixth lens L6 may be configured as an aspherical lens to further improve resolution.

In the embodiment of the present utility model, preferably, the seventh lens L7 is a convex-concave lens with negative focal power, which can smoothly transition the light rays emitted from the first lens L1 to the sixth lens L6 to the imaging plane, reduce the total lens length, and the seventh lens is preferably an aspherical mirror surface, so that aberration can be effectively corrected, resolution can be further improved, and illuminance of the imaging plane is more uniform.

Further, the convex-concave lens is advantageous in workability.

In the present utility model, preferably, the aperture stop is disposed between the second lens L2 and the third lens L3, so that the light entering the optical system can be effectively converged, the total length of the optical system can be shortened, and the aperture of the front lens group and the aperture of the rear lens group can be reduced.

Meanwhile, the lens material adopts the collocation of glass-plastic mixture, so that the cost can be reduced, the difficulty that the focal point of the plastic aspherical lens drifts easily under high and low temperature environments due to large thermal expansion coefficient is overcome, and the use requirement of the lens under high and low temperature environments is met.

In the embodiment of the present utility model, preferably, at least one inflection point is disposed on the image side surface of the seventh lens element L7, which is beneficial to correcting aberration of the system and improving resolution of the system.

In the embodiment of the present utility model, preferably, the radius of curvature R1 of the object side surface and the radius of curvature R2 of the image side surface of the first lens satisfy the following relationship: R1/R2 is more than or equal to 2.4 and less than or equal to 17.0, which is favorable for increasing the angle of view and collecting light rays with large angles.

In the embodiment of the present utility model, it is preferable that the effective focal length F1 of the first lens L1 and the effective focal length F of the optical lens satisfy the following relationship: F1/F less than or equal to 2.9 and less than or equal to-1.0, which is beneficial to more light to enter the optical lens steadily, increases illumination and further improves the resolution of the lens.

In the embodiment of the present utility model, it is preferable that the effective focal length F2 of the second lens L2 and the effective focal length F of the optical lens satisfy the following relationship: 2.3 is less than or equal to |F2/F is less than or equal to 7.4, which is helpful for the optical lens to absorb more light and ensures the light quantity.

In the embodiment of the present utility model, it is preferable that the effective focal length F3 of the third lens L3 and the effective focal length F of the optical lens satisfy the following relationship: F3/F is more than or equal to 1.3 and less than or equal to 4.1, which is beneficial to the optical lens to absorb more light and ensures the light quantity.

In the embodiment of the present utility model, it is preferable that the effective focal length F4 of the fourth lens L4 and the effective focal length F of the optical lens satisfy the following relationship: F4/F is more than or equal to 1.3 and less than or equal to 2.5, which is beneficial to the optical lens to absorb more light and ensures the light quantity.

In the embodiment of the present utility model, it is preferable that the effective focal length F5 of the fifth lens L5 and the effective focal length F6 of the sixth lens L6 satisfy the following relationship: F5/F6 is less than or equal to-1.6 and less than or equal to-0.6;

the effective focal length F7 of the seventh lens L7 and the effective focal length F of the optical lens satisfy the following relationship: F7/F is less than or equal to 5.4 and less than or equal to-2.5, so that the light trend of the rear optical system can be controlled, and the relative illuminance of the rear optical system is improved.

In the embodiment of the present utility model, it is preferable that the effective focal length F1 of the first lens L1 and the effective focal length F4 of the fourth lens L4 satisfy the following relationship: -2.0.ltoreq.F1/F4.ltoreq.0.4;

the effective focal length F4 of the fourth lens L4 and the effective focal length F7 of the seventh lens L7 satisfy the following relationship: F4/F7 is less than or equal to-1.0 and less than or equal to-0.2, so that the stable and clear imaging capability of the lens in high and low temperature environments is ensured, and the back focus variation caused by temperature variation is reduced.

In the embodiment of the present utility model, preferably, the optical total length TLL of the optical lens and the total image height IH of the optical lens satisfy the following relationship: 1.8 is less than or equal to TTL/IH is less than or equal to 1.9, meets the miniaturization requirement, has a large imaging surface, and can be matched with the imaging requirement of a large target surface chip.

In the embodiment of the present utility model, preferably, the optical total length TLL of the optical lens and the back focal length BFL of the optical lens satisfy the following relationship: BFL/TTL is more than or equal to 0 and less than or equal to 0.3, which is beneficial to reducing the total length of the optical system, and the total length TLL of the optical system is not more than 14mm.

In the embodiment of the present utility model, it is preferable that the center thickness d4 of the fourth lens L4 and the center thickness d6 of the sixth lens L6 satisfy the following relationship: the d4/d6 is more than or equal to 0.7 and less than or equal to 1.4, and the symmetrical design of convex, concave and convex is adopted for the fourth lens L4, the fifth lens L5 and the sixth lens L6, so that the aberration of the system can be effectively balanced, the resolution of the system can be improved, and the imaging quality can be improved.

In the embodiment of the present utility model, it is preferable that the distance T67 between the center of the image side of the sixth lens element L6 and the center of the object side of the seventh lens element L7 on the optical axis and the back focal length BFL of the optical lens element satisfy the following relationship: T67/BFL is more than or equal to 0 and less than or equal to 0.1, which is beneficial to improving the resolution quality, increasing the assembly yield of the optical lens, and enabling the optical lens to have enough back focus BFL to place other optical elements so as to increase the design flexibility of the optical lens.

In the embodiment of the present utility model, it is preferable that the center thickness dn of the nth lens having the largest center thickness among the first to seventh lenses L1 to L7 and the center thickness dm of the mth lens having the smallest center thickness satisfy the following relationship: 2.9-dn/dm-5.4, which is beneficial to making the thickness of each lens of the optical lens uniform and the effect stable.

In the embodiment of the present utility model, it is preferable that the effective aperture SD21 of the object side surface of the second lens L2 and the effective aperture SD31 of the object side surface of the third lens L3 satisfy the following relationship: SD21/SD31 is less than or equal to 1.2 and less than or equal to 2.1, and the aperture of the front lens and the aperture of the rear lens of the diaphragm are set to play a good role in light receiving, so that the lens has enough angle of view and ensures the maximum light flux, and the f-number FNo is not more than 2.2.

In the embodiment of the present utility model, it is preferable that the abbe number Vd1 of the first lens L1 and the abbe number Vd2 of the second lens L2 satisfy the following relationship: the chromatic aberration generated by the first lens and the second lens can be effectively compensated by selecting a proper chromatic dispersion coefficient range, and the imaging quality is improved, wherein the chromatic aberration is more than or equal to 20 and less than or equal to |Vd1-Vd2| is more than or equal to 40. An image side surface.

The following sets of embodiments are given to specifically illustrate an optical lens according to the present utility model according to the above-described arrangement of the present utility model. Since the optical lens according to the present utility model has seven lenses in total, 18 surfaces in total are added with the stop STO protection glass CG and the image surface IMA. For convenience of description, the respective face numbers are denoted by S1, S2 to S18. And the aspherical surface satisfies the following formula:

wherein z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a is that ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ … … are aspheric coefficients of four, six, eight, ten, fourteen, sixteen and … …, respectively

Four sets of example data are shown in table 1 below:

TABLE 1

Example 1:

fig. 1 is a schematic structural diagram of an optical lens according to embodiment 1 of the present utility model.

In embodiment 1, the optical power of the second lens L2 is positive, the third lens L3 is a concave-convex lens (in the direction from the object side to the image side along the optical axis), and the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses.

Table 2 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature R value, thickness, refractive index of material, abbe number:

TABLE 2

Table 3 shows the aspherical coefficients of each aspherical lens in the present embodiment, K is the quadric constant of the surface, A ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ Aspheric coefficients of fourth order, sixth order, eighth order, tenth order, fourteen order and sixteen order are respectively adopted.

Face number

K

A 4

A 6

A 8

A 10

A 12

A 14

A 16

S1

-34.144

1.37E-03

-2.69E-04

1.71E-05

-1.89E-06

-7.34E-08

4.07E-08

-1.02E-09

S2

-1.044

1.23E-02

1.83E-03

5.01E-04

-4.57E-05

9.59E-05

2.07E-05

-2.07E-05

S3

-5.603

1.58E-02

6.63E-04

2.79E-04

3.24E-04

1.27E-05

-5.39E-05

-8.04E-06

S4

6.345

7.00E-03

-7.07E-04

2.82E-03

2.66E-04

-6.45E-04

-5.54E-05

1.13E-05

S6

49.169

-1.32E-04

-3.23E-03

3.09E-03

-2.64E-05

-9.61E-04

1.70E-05

1.77E-04

S7

-0.147

-7.09E-03

-1.14E-03

-4.25E-04

7.09E-05

-1.83E-04

6.81E-05

-1.45E-05

S10

13.106

-1.47E-02

2.96E-03

-3.79E-04

-7.10E-06

3.31E-06

-2.14E-07

1.82E-09

S11

-11.989

-5.76E-04

-4.07E-04

1.05E-04

-1.43E-05

-7.91E-08

7.03E-08

-1.54E-09

S12

-30.990

9.75E-03

-3.36E-03

3.32E-04

-1.22E-05

-3.28E-07

3.45E-08

1.31E-09

S13

-2.987

-2.26E-03

-1.44E-04

-5.65E-05

8.63E-06

-3.51E-07

-3.60E-08

4.00E-09

S14

-1.916

-1.12E-02

-8.48E-04

1.51E-04

-6.50E-06

1.07E-08

-1.41E-09

6.37E-11

S15

-2.061

-1.69E-02

1.10E-03

-3.90E-05

4.51E-07

-4.14E-08

1.98E-09

7.28E-13

TABLE 3 Table 3

According to fig. 1 and tables 1 to 3, the present embodiment can provide an optical lens which has a high resolution (6M), is compact, has a large angle of view, a large aperture, has an optical total length of 14mm or less, is low in cost, and is suitable for use in high and low temperature environments.

Example 2:

fig. 2 is a schematic structural diagram of an optical lens according to embodiment 2 of the present utility model.

In embodiment 2, the optical power of the second lens L2 is negative, the third lens L3 is a biconvex lens (in the direction from the object side to the image side along the optical axis), and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

Table 4 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature R value, thickness, refractive index of material, abbe number:

TABLE 4 Table 4

Table 5 shows the aspherical coefficients of each aspherical lens in the present embodiment, K is the quadric constant of the surface, A ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ Aspheric coefficients of fourth order, sixth order, eighth order, tenth order, fourteen order and sixteen order are respectively adopted.

Face number

K

A 4

A 6

A 8

A 10

A 12

A 14

A 16

S3

49.981

5.14E-02

-1.21E-02

3.16E-03

-5.05E-04

2.57E-05

2.51E-07

-1.03E-07

S4

2.788

8.35E-02

-7.31E-03

3.00E-03

3.53E-03

-1.24E-03

-1.08E-04

7.39E-05

S6

-50.000

1.02E-02

-2.71E-03

5.09E-03

-3.38E-03

6.44E-04

6.14E-05

-2.01E-05

S7

-0.447

-5.66E-03

-3.66E-05

-1.41E-04

1.78E-06

1.20E-05

-7.80E-06

-4.23E-07

S10

-6.052

-2.70E-02

2.31E-03

-3.85E-04

1.41E-05

-3.66E-06

4.60E-08

8.60E-09

S11

0.883

-1.50E-02

1.53E-03

-5.01E-05

-4.89E-06

-5.48E-07

-3.88E-08

7.55E-09

S12

-16.563

6.67E-03

-3.09E-03

3.95E-04

-1.87E-05

-2.51E-07

2.01E-08

3.27E-09

S13

-4.245

-4.19E-03

2.05E-04

-1.01E-04

1.63E-05

-7.36E-07

4.14E-09

2.77E-09

S14

-0.801

-2.14E-02

-4.20E-04

1.92E-04

-7.17E-06

-4.79E-08

1.54E-10

2.17E-10

S15

-2.529

-2.26E-02

1.99E-03

-8.38E-05

-4.24E-07

1.27E-07

5.40E-11

2.55E-11

TABLE 5

According to fig. 2, table 1, table 4 and table 5, the present embodiment can provide an optical lens which has a high resolution (6M), is compact, has a large angle of view, has a large aperture, has an optical total length of 14mm or less, is low in cost, and is suitable for use in high and low temperature environments.

Example 3:

fig. 3 is a schematic structural diagram of an optical lens in embodiment 3 of the present utility model.

In embodiment 3, the optical power of the second lens L2 is positive, the third lens L3 is a concave-convex lens (in the direction from the object side to the image side along the optical axis), and the first lens L1, the second lens L2, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

Table 6 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature R value, thickness, refractive index of material, abbe number:

face number	Surface type	R value	Thickness of (L)	Refractive index	Abbe number
						S1	Aspherical surface	29.64	0.86	1.54	56.0
S2	Aspherical surface	1.778	1.51
						S3	Aspherical surface	3.987	1.12	1.64	23.5
S4	Aspherical surface	20.522	1.14
						S5(STO)	Spherical surface	Infinity	0.24
S6	Spherical surface	-13.691	0.96	1.44	95.1
						S7	Spherical surface	-3.501	0.10
S8	Spherical surface	8.327	2.19	1.50	81.6
						S9	Spherical surface	-4.595	0.10
S10	Aspherical surface	-16.822	0.60	1.64	23.5
						S11	Aspherical surface	3.502	0.10
S12	Aspherical surface	3.3	2.17	1.54	56.0
						S13	Aspherical surface	-2.646	0.10
S14	Aspherical surface	4.679	0.90	1.54	56.0
						S15	Aspherical surface	1.97	1.06
S16	Spherical surface	Infinity	0.60	1.52	64.2
						S17	Spherical surface	Infinity	0.20
S18(IMA)	Spherical surface	Infinity	0

TABLE 6

Table 7 shows the aspherical coefficients of each aspherical lens in the present embodiment, K is the quadric constant of the surface, A ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ Aspheric coefficients of fourth order, sixth order, eighth order, tenth order, fourteen order and sixteen order are respectively adopted.

Face number

K

A 4

A 6

A 8

A 10

A 12

A 14

A 16

S1

33.147

4.73E-03

-2.67E-04

3.14E-06

2.27E-07

-5.85E-09

0.00E+00

0.00E+00

S2

-0.802

7.04E-03

1.31E-03

3.92E-04

6.21E-06

-1.95E-05

0.00E+00

0.00E+00

S3

-7.274

9.23E-03

1.17E-04

2.33E-04

-1.32E-04

7.86E-06

0.00E+00

0.00E+00

S4

45.853

1.34E-03

3.19E-03

-1.44E-03

2.90E-04

-2.51E-05

0.00E+00

0.00E+00

S10

50

-1.27E-02

3.98E-03

-8.43E-04

9.52E-05

-3.88E-06

0.00E+00

0.00E+00

S11

-10.415

-5.65E-03

-9.72E-04

2.29E-04

-3.70E-06

-1.28E-06

0.00E+00

0.00E+00

S12

-7.863

5.73E-03

-2.82E-03

3.88E-04

-1.59E-05

-7.25E-08

0.00E+00

0.00E+00

S13

-8.059

2.66E-03

3.46E-04

-1.01E-04

9.57E-06

-9.73E-08

0.00E+00

0.00E+00

S14

-0.0588

-1.20E-02

-7.81E-04

1.63E-04

-6.30E-06

4.38E-08

0.00E+00

0.00E+00

S15

-5.994

-1.04E-02

1.93E-04

-4.40E-06

4.32E-06

-2.01E-07

0.00E+00

0.00E+00

TABLE 7

According to fig. 3, table 1, table 6 and table 7, the present embodiment can provide an optical lens with high resolution (6M) which is compact, has a large angle of view, a large aperture, an optical total length of 14mm or less, is low in cost, and is suitable for use in high and low temperature environments.

Example 4:

fig. 4 is a schematic structural diagram of an optical lens in embodiment 4 of the present utility model.

In embodiment 4, the optical power of the second lens L2 is positive, the third lens L3 is a concave-convex lens (in the direction from the object side to the image side along the optical axis), the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspherical lenses, and the fourth lens L4 is a glass aspherical lens.

Table 8 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature R value, thickness, refractive index of material, abbe number:

face number	Surface type	R value	Thickness of (L)	Refractive index	Abbe number
						S1	Aspherical surface	22.969	0.84	1.54	56.0
S2	Aspherical surface	2.095	0.67
						S3	Aspherical surface	3.808	0.99	1.64	23.5
S4	Aspherical surface	5.121	0.54
						S5(STO)	Spherical surface	Infinity	0.17
S6	Aspherical surface	-10.48	1.37	1.54	56.0
						S7	Aspherical surface	-2.844	0.10
S8	Aspherical surface	6.872	2.17	1.50	81.6
						S9	Aspherical surface	-4.648	0.10
S10	Aspherical surface	-18.533	0.80	1.64	23.5
						S11	Aspherical surface	5.746	0.44
S12	Aspherical surface	127.436	2.42	1.54	56.0
						S13	Aspherical surface	-2.466	0.10
S14	Aspherical surface	2.461	0.80	1.64	23.5
						S15	Aspherical surface	1.557	1.53
S16	Spherical surface	Infinity	0.60	1.52	64.2
						S17	Spherical surface	Infinity	0.20
S18(IMA)	Spherical surface	Infinity	0

TABLE 8

Table 9 shows the aspherical lenses in the present embodimentAspheric coefficient, K is the quadric constant of the surface, A ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ Aspheric coefficients of fourth order, sixth order, eighth order, tenth order, fourteen order and sixteen order are respectively adopted.

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TABLE 9

According to fig. 4, table 1, table 8 and table 9, the present embodiment can provide an optical lens which has a high resolution (6M), is compact, has a large angle of view, has a large aperture, has an optical total length of 14mm or less, is low in cost, and is suitable for use in high and low temperature environments.

The utility model is provided with seven lenses, has the characteristics of simple structure and lower cost, optimizes the shape of each lens by reasonably distributing the focal power of each lens, has the characteristics of low cost, large field angle and large aperture FNO less than or equal to 2.2 while meeting the requirement that the optical lens has higher resolving power, and has the optical total length within 14mm and is suitable for high and low temperature environments.

The above description is only one embodiment of the present utility model and is not intended to limit the present utility model, and various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (15)

1. An optical lens comprising, in order along an optical axis from an object side to an image side: a first lens (L1) with negative focal power, a second lens (L2), a third lens (L3) with positive focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with negative focal power, a sixth lens (L6) with positive focal power, a seventh lens (L7) with negative focal power and a protective sheet glass (CG), wherein the second lens (L2) is a convex-concave lens, and the fifth lens (L5) is a biconcave lens;

the center thickness dn of the nth lens having the largest center thickness among the first to seventh lenses (L1) to (L7) and the center thickness dm of the mth lens having the smallest center thickness satisfy the following relationship: and dn/dm is more than or equal to 2.9 and less than or equal to 5.4.

2. The optical lens according to claim 1, wherein the first lens (L1) is a convex-concave type lens, the image side surface of the third lens (L3) is a convex surface, the fourth lens (L4) is a biconvex type lens, the sixth lens (L6) is a biconvex type lens, and the seventh lens (L7) is a convex-concave type lens, in a direction from the object side to the image side of the optical axis.

3. The optical lens according to any one of claims 1 to 2, wherein a radius of curvature R1 of an object side surface and a radius of curvature R2 of an image side surface of the first lens satisfy the following relationship: R1/R2 is more than or equal to 2.4 and less than or equal to 17.0.

4. The optical lens according to any one of claims 1 to 2, characterized in that the effective focal length F1 of the first lens (L1) and the effective focal length F of the optical lens satisfy the following relationship: -2.9.ltoreq.F1/F.ltoreq.1.0.

5. The optical lens according to any one of claims 1 to 2, characterized in that the effective focal length F2 of the second lens (L2) and the effective focal length F of the optical lens satisfy the following relationship: 2.3 is less than or equal to |F2/F is less than or equal to 7.4.

6. The optical lens according to any one of claims 1 to 2, characterized in that the effective focal length F3 of the third lens (L3) and the effective focal length F of the optical lens satisfy the following relationship: F3/F is less than or equal to 1.3 and less than or equal to 4.1.

7. The optical lens according to any one of claims 1 to 2, characterized in that the effective focal length F4 of the fourth lens (L4) and the effective focal length F of the optical lens satisfy the following relationship: F4/F is less than or equal to 1.3 and less than or equal to 2.5.

8. The optical lens according to any one of claims 1 to 2, characterized in that the effective focal length F5 of the fifth lens (L5) and the effective focal length F6 of the sixth lens (L6) satisfy the following relationship: F5/F6 is less than or equal to-1.6 and less than or equal to-0.6;

an effective focal length F7 of the seventh lens (L7) and an effective focal length F of the optical lens satisfy the following relationship: -5.4.ltoreq.F7/F.ltoreq.2.5.

9. The optical lens according to any one of claims 1 to 2, characterized in that the effective focal length F1 of the first lens (L1) and the effective focal length F4 of the fourth lens (L4) satisfy the following relationship: -2.0.ltoreq.F1/F4.ltoreq.0.4;

an effective focal length F4 of the fourth lens (L4) and an effective focal length F7 of the seventh lens (L7) satisfy the following relationship: F4/F7 is less than or equal to-1.0 and less than or equal to-0.2.

10. The optical lens according to any one of claims 1 to 2, wherein an optical total length TLL of the optical lens and a total image height IH of the optical lens satisfy the following relationship: TTL/IH is less than or equal to 1.8 and less than or equal to 1.9.

11. The optical lens according to any one of claims 1 to 2, characterized in that the optical total length TLL of the optical lens and the back focal length BFL of the optical lens satisfy the following relationship: BFL/TTL is more than or equal to 0 and less than or equal to 0.3.

12. The optical lens according to any one of claims 1 to 2, characterized in that the center thickness d4 of the fourth lens (L4) and the center thickness d6 of the sixth lens (L6) satisfy the following relationship: d4/d6 is more than or equal to 0.7 and less than or equal to 1.4.

13. The optical lens according to any one of claims 1 to 2, wherein a separation distance T67 on the optical axis from the center of the image side of the sixth lens (L6) to the center of the object side of the seventh lens (L7) satisfies the following relationship with the back focal length BFL of the optical lens: T67/BFL is more than or equal to 0 and less than or equal to 0.1.

14. The optical lens according to any one of claims 1 to 2, wherein the effective aperture SD21 of the object side surface of the second lens (L2) and the effective aperture SD31 of the object side surface of the third lens (L3) satisfy the following relationship: SD21/SD31 is more than or equal to 1.2 and less than or equal to 2.1.

15. Optical lens according to any one of claims 1 to 2, characterized in that the abbe number Vd1 of the first lens (L1) and the abbe number Vd2 of the second lens (L2) satisfy the following relation: the content of the |Vd1-Vd2| is less than or equal to 20 and less than or equal to 40.

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