CN115826200A

CN115826200A - Low-cost high-definition vehicle-mounted front-view lens and application thereof

Info

Publication number: CN115826200A
Application number: CN202211671455.7A
Authority: CN
Inventors: 洪坚; 杨成林; 安宁; 杨井留; 李强; 孙振中
Original assignee: Sirtec International Suzhou Co ltd
Current assignee: Sirtec International Suzhou Co ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-03-21

Abstract

The invention provides a low-cost high-definition vehicle-mounted front-view lens and application thereof.A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a parallel flat plate and an image plane IMA are sequentially arranged along the incident direction of an optical axis, wherein the first lens has positive focal power, 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 negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface or a convex surface; the third lens has positive focal power, 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 or a convex surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses; the vehicle-mounted low-cost high-definition front-view lens solves the problems of high cost and complex processing of a glass aspheric surface, has the advantages of small optical field curvature, small distortion, clear imaging and the like, and reduces the production cost.

Description

Low-cost high-definition vehicle-mounted front-view lens and application thereof

Technical Field

The invention relates to the technical field of optical imaging, in particular to a low-cost high-definition vehicle-mounted front-view lens and application thereof.

Background

In recent years, with the development of vehicle-mounted technology, there has been an increasing demand for forward-looking cameras, automatic cruise cameras, automobile data recorders, and vehicle-mounted cameras. The front-view vehicle-mounted lens is an important component in an advanced driver assistance system, and a driver can find out an obstacle in front of the vehicle through the front-view vehicle-mounted lens, so that driving accidents are avoided; the high-definition forward-looking camera lens has a wide application prospect, but the traditional high-definition forward-looking camera lens has the following technical problems:

1) In order to improve the resolution, the traditional high-definition forward-looking camera lens generally uses 1 to 3 aspheric molded glass lenses, has high cost, complex processing and difficult processing and manufacturing, and has the technical problems of large optical field curvature, large distortion, unclear imaging and the like;

2) The traditional high-definition forward-looking camera lens is not beneficial to smoothly carrying and converting light rays, has larger aberration and larger lens sensitivity, and is also not beneficial to reducing the caliber of the lens;

3) The traditional high-definition forward-looking camera lens has large chromatic aberration, so that the imaging quality is poor, the transmittance of the traditional high-definition forward-looking camera lens is poor, and the assembly difficulty is high.

Disclosure of Invention

In order to solve the technical problems, the invention provides a low-cost high-definition vehicle-mounted forward-looking lens and application thereof, which solve the problems of high cost and complex processing of a glass aspheric surface.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a low-cost high-definition vehicular forward-looking lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a parallel flat plate and an image plane I MA along the incident direction of an optical axis, wherein,

the first lens has positive focal power, 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 negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface or a convex surface;

the third lens has positive focal power, 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 or a convex surface;

the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a concave surface or a convex surface;

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

the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface;

the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface or a concave surface, and the image side surface of the seventh lens is a concave surface or a convex surface;

the eighth lens has negative focal power, the object side surface of the eighth lens is a concave surface or a convex surface, and the image side surface of the eighth lens is a concave surface;

the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses.

The invention provides a low-cost high-definition vehicle-mounted forward-looking lens and application thereof, which solve the problems of high cost and complex processing of a glass aspheric surface.

Preferably, at least one of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is a cemented lens.

Preferably, the first lens Nd1 is more than 1.79, vd1 is more than 35, wherein Nd1 refers to the refractive index of the first lens, and Vd1 refers to the Abbe number of the first lens; the second lens Nd2 is more than 1.72, vd2 is less than 29, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens; the third lens Nd3 is more than 1.74, vd3 is less than 53, wherein Nd3 refers to the refractive index of the third lens, and Vd3 refers to the Abbe number of the third lens; the fifth lens Nd5 is less than 1.76, vd5 is less than 53, wherein Nd5 refers to the refractive index of the fifth lens, and Vd5 refers to the Abbe number of the fifth lens; the seventh lens Nd7 is more than or equal to 1.8, vd7 is less than 47, wherein Nd7 refers to the refractive index of the seventh lens, and Vd7 refers to the Abbe number of the seventh lens.

As a preferred technical solution, the high-definition vehicle-mounted front-view lens meets the following conditions:

BFL/TTL≥0.1，

the BFL is the distance from the center of the image side surface of the eighth lens of the high-definition vehicle-mounted forward-looking lens to the imaging surface of the optical lens on the optical axis; and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis.

As a preferred technical solution, the high-definition vehicle-mounted forward-looking lens meets the following conditions:

0.32≤FOV/h/D≤0.38，

wherein the FOV is the maximum field angle of the optical lens;

d is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens; and

h is the image height corresponding to the maximum field angle of the optical lens.

As a preferred technical solution, the following conditional expression is satisfied among the maximum field angle FOV of the high-definition vehicle-mounted forward-looking lens, the entire group of focal length values f of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens:

56≤(FOV×f)/h≤58。

as a preferred technical solution, the high-definition vehicle-mounted forward-looking lens satisfies the conditional expression:

TTL/f≤2.2，

wherein, TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the optical lens, and f is a focal length of the entire group of lenses.

As a preferred technical solution, the high-definition vehicle-mounted front-view lens satisfies the conditional expression: f1/f is more than or equal to 1.75 and less than or equal to 3, f2/f is more than or equal to 4 and less than or equal to-0.6, f3/f is more than or equal to 0.6 and less than or equal to 2.4, f6/f is more than or equal to 0.35 and less than or equal to 0.9, wherein f1, f2, f3 and f6 are focal lengths of the first lens, the second lens, the third lens and the sixth lens in sequence, and f is a focal length of the whole group of lenses.

Preferably, a diaphragm is disposed between the first lens and the second lens.

The invention also provides a low-cost high-definition vehicle-mounted front-view lens which is used as an automobile front-view system and applied to automatic driving.

The invention provides a low-cost high-definition vehicle-mounted front-view lens and application thereof, and the vehicle-mounted front-view lens has the following beneficial effects:

1) The invention provides a low-cost high-definition vehicle-mounted forward-looking lens and application thereof, which solve the problems of high cost and complex processing of using a glass aspheric surface, have the advantages of small optical field curvature, small distortion, clear imaging and the like, and reduce the production cost;

2) The invention provides a low-cost high-definition vehicle-mounted forward-looking lens and application thereof, wherein the first lens has positive focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens is in a meniscus shape, so that light collection is facilitated, and distortion is reduced; the diaphragm is arranged between the first lens and the second lens, so that the aperture of the lens can be reduced; the second lens has negative focal power, so that the reflected light can be smoothly carried, the aberration is reduced, the sensitivity of the lens is reduced, and the aperture of the lens is reduced; the third lens and the sixth lens both have positive focal power, so that light rays can be favorably refracted, and the length of the lens is reduced;

3) The invention provides a low-cost high-definition vehicle-mounted forward-looking lens and application thereof.

Drawings

Fig. 1 is a structural combination diagram of a low-cost high-definition vehicle-mounted front view lens provided in embodiment 1 (an object side is at the leftmost position, and an image side is at the rightmost position);

fig. 2 is a field curvature distortion diagram of the low-cost high-definition vehicular front view lens provided in embodiment 1;

fig. 3 is a structural combination diagram of a low-cost high-definition vehicle-mounted front view lens provided in embodiment 2 (an object side is at the leftmost position, and an image side is at the rightmost position);

fig. 4 is a field curvature distortion diagram of the low-cost high-definition vehicular front-view lens provided in embodiment 2;

fig. 5 is a structural combination diagram of a low-cost high-definition vehicle-mounted front view lens provided in embodiment 3 (an object side is at the leftmost position, and an image side is at the rightmost position);

fig. 6 is a field curvature distortion diagram of the low-cost high-definition vehicular front-view lens provided in embodiment 3;

fig. 7 is a structural combination diagram of a low-cost high-definition vehicle-mounted front view lens provided in embodiment 4 (where an object side is at the leftmost position, and an image side is at the rightmost position);

fig. 8 is a field curvature distortion diagram of a low-cost high-definition vehicular front-view lens provided in embodiment 4;

fig. 9 is a structural combination diagram of a low-cost high-definition vehicle-mounted front view lens provided in embodiment 5 (where an object side is at the leftmost position, and an image side is at the rightmost position);

fig. 10 is a field curvature distortion diagram of the low-cost high-definition vehicular front-view lens provided in embodiment 5;

wherein, 1-a first lens; 2-a second lens; 3-a third lens; 4-a fourth lens; 5-a fifth lens; 6-sixth lens; 7-a seventh lens; 8-an eighth lens; 9-a diaphragm; 10-parallel plates; 11-image plane I MA.

Detailed Description

It should be noted that the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", and "eighth" are used to define the components, and are only used to distinguish the corresponding components, and unless otherwise stated, the terms do not have any special meaning, and therefore, the scope of the present invention should not be construed as being limited.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

It is understood that the invention achieves the objects of the invention by means of some embodiments.

Example 1

As shown in FIG. 1, the present invention provides a low-cost high-definition vehicular front view lens, which is sequentially provided with 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, an eighth lens 8, a parallel flat plate 10 and an image plane I MA11 along an incident direction of an optical axis, wherein,

the first lens 1 has positive focal power, 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 2 has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;

the third lens 3 has positive focal power, 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 4 has positive focal power, and the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;

the fifth lens 5 has negative focal power, 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 element 6 has positive focal power, and has a convex object-side surface and a convex image-side surface;

the seventh lens 7 has positive focal power, and the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface;

the eighth lens 8 has negative focal power, and the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface;

the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all glass spherical lenses; the second lens 2 and the third lens 3 constitute a cemented lens, and the fifth lens 5 and the sixth lens 6 constitute a cemented lens; the first lens 1 has positive focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens 1 is in a meniscus shape, so that light rays can be collected conveniently, and distortion can be reduced; the diaphragm 9 is arranged between the first lens 1 and the second lens 2, so that the aperture of the lens can be reduced; the second lens 2 has negative focal power, so that the reflected light can be smoothly carried, the aberration is reduced, the sensitivity of the lens is reduced, and the aperture of the lens is reduced; the third lens 3 and the sixth lens 6 both have positive focal power, so that light rays can be favorably refracted, and the length of a lens can be reduced; the second lens 2 and the third lens 3 form a cemented lens, the fifth lens 5 and the sixth lens 6 form a cemented lens, at least one group of cemented lenses can reduce or eliminate chromatic aberration, the imaging quality is improved, the cemented lens improves the lens transmittance, and the assembly difficulty is reduced; optical parameters of the low-cost high-definition vehicle-mounted front-view lens provided by the embodiment 1 are shown in a table 1;

table 1 optical parameters of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 1

From table 1, we can observe that the first lens 1Nd1 is 1.880, the first lens 1Vd1 is 40.900, the first lens 1Nd1 > 1.79, and vd1 > 35, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the abbe number of the first lens;

the second lens 2Nd2 is 1.760, the second lens 2Vd2 is 27.500, the second lens 2Nd2 is more than 1.72, vd2 is less than 29, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the Abbe number of the second lens 2;

the third lens 3Nd3 is 1.920, the third lens 3Vd3 is 20.900, the third lens 3Nd3 is more than 1.74, vd3 is less than 53, wherein Nd3 refers to the refractive index of the third lens 3, and Vd3 refers to the Abbe number of the third lens 3;

the fifth lens 5Nd5 is 1.580, the fifth lens 5Vd5 is 41.500, the fifth lens 5Nd5 < 1.76, vd5 < 53, wherein Nd5 refers to the refractive index of the fifth lens 5, and Vd5 refers to the Abbe number of the fifth lens 5;

the number of the seventh lens 7Nd7 is 1.800, the number of the seventh lens 7Vd7 is 46.600, the number of the seventh lens 7Nd7 is more than or equal to 1.8, vd7 is less than 47, wherein Nd7 refers to the refractive index of the seventh lens 7, and Vd7 refers to the Abbe number of the seventh lens;

a specification summary table of the low-cost high-definition vehicle-mounted front-view lens provided in embodiment 1 is shown in table 2;

table 2 summary of specifications of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 1

	f	BFL	TTL	FOV	h	D
							Example 1	15.39	4.1	32.23	34.4	9.252	10.24

From table 2, we can observe that BFL/TTL =0.127, satisfies the following condition: BFL/TTL is more than or equal to 0.1, wherein BFL is the distance from the center of the image side surface of the eighth lens of the high-definition vehicle-mounted forward-looking lens to the imaging surface of the optical lens on the optical axis; and TTL is the distance on the optical axis from the center of the object-side surface of the first lens element 1 to the imaging surface of the optical lens;

further BFL/TTL is more than 0.12, which is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module;

from table 2, we can observe that FOV/h/D =0.363, satisfies the following condition: the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, wherein the FOV is the maximum field angle of the optical lens; d is the maximum clear aperture of the side surface of the first lens object 1 corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens; when the high-definition vehicle-mounted front-view lens meets the following conditions: when the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, the small caliber of the front end lens is favorably realized;

from table 2, we can observe that (FOV × f)/h =57.222, the following conditional expression is satisfied: 56 is less than or equal to (FOV multiplied by f)/h is less than or equal to 58; _{wherein the content of the first and second substances,} FOV is the maximum view field angle of the high-definition vehicle-mounted forward-looking lens, f is the focal length value of the whole group of the optical lens, h is the image height corresponding to the maximum view field angle of the optical lens,

controlling three indexes of FOV, f and h to satisfy the following conditional expression: when the FOV xf/h is more than or equal to 56 and less than or equal to 58, the lens distortion is favorably reduced;

from table 2, we can observe that TTL/f =2.094, the high-definition on-vehicle front-view lens satisfies the conditional expression: TTL/f is less than or equal to 2.2, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the optical lens on the optical axis, and f is the focal length of the whole group of lenses; the miniaturization of the lens is facilitated.

The high-definition vehicle-mounted front-view lens meets the conditional expression: f1/f is more than or equal to 1.75 and less than or equal to 3, f2/f is more than or equal to 4 and less than or equal to-0.6, f3/f is more than or equal to 0.6 and less than or equal to 2.4, f6/f is more than or equal to 0.35 and less than or equal to 0.9, wherein f1, f2, f3 and f6 are focal lengths of the first lens 1, the second lens 2, the third lens 3 and the sixth lens 6 in sequence, and f is a focal length of the whole group of lenses; by reasonably matching the focal length of the lens, the assembly sensitivity is favorably reduced, the drift of the lens is controlled in a small range after high and low temperature, and the requirement of clear imaging is met.

The embodiment also provides a low-cost high-definition vehicle-mounted front-view lens which is used as an automobile front-view system and applied to automatic driving.

As shown in fig. 2, a field curvature distortion diagram of the low-cost high-definition vehicle-mounted front view lens provided in embodiment 1 is shown in the left side, where the left side is a field curvature graph, the ordinate of the field curvature graph is a field angle, the abscissa is a distance from an image point to a paraxial image plane, T represents a meridional field curvature, S represents a sagittal field curvature, and the field curvature graph shows a distance from a current focal plane or an image plane as a function of the field coordinate to the paraxial focal plane, and is divided into a meridional field curvature and a sagittal field curvature; the right image is a distortion curve graph, the ordinate of the distortion graph is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, and reflects the similarity degree of the object image.

Example 2

As shown in fig. 3, the present invention provides a low-cost high-definition vehicular front view lens, which is sequentially provided with 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, an eighth lens 8, a parallel flat plate 10 and an image plane I MA11 along an incident direction of an optical axis, wherein,

the third lens 3 has positive focal power, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

the fourth lens 4 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;

the seventh lens 7 has positive focal power, 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 eighth lens 8 has negative focal power, and the object-side surface of the eighth lens is a convex surface, and the image-side surface of the eighth lens is a concave surface;

the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all glass spherical lenses; the second lens 2 and the third lens 3 constitute a cemented lens, and the fifth lens 5 and the sixth lens 6 constitute a cemented lens; the first lens 1 has positive focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens 1 is in a meniscus shape, so that light collection is facilitated, and distortion is reduced; the diaphragm is arranged between the first lens 1 and the second lens 2, so that the aperture of the lens can be reduced; the second lens 2 has negative focal power, so that the reflected light can be smoothly carried, the aberration is reduced, the sensitivity of the lens is reduced, and the aperture of the lens is reduced; the third lens 3 and the sixth lens 6 both have positive focal power, which is beneficial to folding light rays and reducing the length of the lens; the second lens 2 and the third lens 3 form a cemented lens, the fifth lens 5 and the sixth lens 6 form a cemented lens, at least one group of cemented lenses reduces or eliminates chromatic aberration, the imaging quality is improved, the cemented lens improves the lens transmittance, and the assembly difficulty is reduced; optical parameters of the low-cost high-definition vehicle-mounted front-view lens provided by the embodiment 2 are shown in table 3;

table 3 optical parameters of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 2

From table 3, we can observe that the first lens 1Nd1 is 1.792, the first lens 1Vd1 is 47.500, the first lens 1Nd1 > 1.79, vd1 > 35, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the abbe number of the first lens 1;

the second lens 2Nd2 is 1.730, the second lens 2Vd2 is 28.300, the second lens 2Nd2 is more than 1.72, vd2 is less than 29, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the Abbe number of the second lens 2;

the third lens 3Nd3 is 2.000, the third lens 3Vd3 is 28.300, the third lens 3Nd3 is more than 1.74, vd3 is less than 53, wherein Nd3 refers to the refractive index of the third lens 3, and Vd3 refers to the Abbe number of the third lens 3;

the fifth lens 5Nd5 is 1.650, the fifth lens 5Vd5 is 33.800, the fifth lens 5Nd5 < 1.76, the Vd5 < 53, wherein Nd5 refers to the refractive index of the fifth lens 5, and Vd5 refers to the Abbe number of the fifth lens 5;

the seventh lens 7Nd7 is 1.810, the seventh lens 7Vd7 is 22.700, the seventh lens 7Nd7 is more than or equal to 1.8, vd7 is less than 47, wherein Nd7 refers to the refractive index of the seventh lens 7, and Vd7 refers to the Abbe number of the seventh lens 7;

a specification summary table of the low-cost high-definition vehicle-mounted front-view lens provided in embodiment 2 is shown in table 4;

table 4 summary of specifications of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 2

	f	BFL	TTL	FOV	h	D
							Example 2	15.38	3.2	30.51	34.4	9.252	10.2

From table 4, we can observe that BFL/TTL =0.105, the following condition is satisfied: BFL/TTL is more than or equal to 0.1, wherein BFL is the distance from the center of the image side surface of the eighth lens of the high-definition vehicle-mounted forward-looking lens to the imaging surface of the optical lens on the optical axis; TTL is the distance from the center of the object-side surface of the first lens element 1 to the imaging surface of the optical lens on the optical axis, which is beneficial to increasing the optical back focus of the lens and leaving sufficient space for the module;

from table 4 we can observe that FOV/h/D =0.365, satisfies the following condition: the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, wherein the FOV is the maximum field angle of the optical lens; d is the maximum light-passing aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens; when the high-definition vehicle-mounted front-view lens meets the following conditions: when the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, the small caliber of the front end lens is favorably realized;

from table 4, we can observe that (FOV × f)/h =57.185 satisfies the following conditional expression: 56 is less than or equal to (FOV multiplied by f)/h is less than or equal to 58; the FOV is the maximum view field angle of the high-definition vehicle-mounted forward-looking lens, f is the whole group of focal length values of the optical lens, h is the image height corresponding to the maximum view field angle of the optical lens, and the FOV, the f and the h are controlled to meet the following conditional expression: when the FOV xf/h is more than or equal to 56 and less than or equal to 58, the lens distortion is favorably reduced;

from table 4, we can observe that TTL/f =1.984, the high-definition on-vehicle front-view lens satisfies the conditional expression: TTL/f is less than or equal to 2.2, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the optical lens on the optical axis, and f is the focal length of the whole group of lenses; the miniaturization of the lens is facilitated.

As shown in fig. 4, a field curvature distortion diagram of the low-cost high-definition vehicle-mounted front view lens provided in embodiment 2 is shown in the left side, where the left side is a field curvature graph, the ordinate of the field curvature graph is a field angle, the abscissa is a distance from an image point to a paraxial image plane, T represents a meridional field curvature, S represents a sagittal field curvature, and the field curvature graph shows a distance from a current focal plane or an image plane as a function of a field coordinate to the paraxial focal plane, and is divided into a meridional field curvature and a sagittal field curvature; the right image is a distortion curve graph, the ordinate of the distortion graph is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, and reflects the similarity degree of the object image.

Example 3

As shown in fig. 5, the present invention provides a low-cost high-definition vehicular front view lens, which is sequentially provided with 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, an eighth lens 8, a parallel flat plate 10 and an image plane I MA11 along an incident direction of an optical axis, wherein,

the second lens 2 has negative focal power, 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 fourth lens 4 has positive focal power, and the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface;

the fifth lens 5 has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;

the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all glass spherical lenses; the third lens 3 and the fourth lens 4 constitute a cemented lens, and the fifth lens 5 and the sixth lens 6 constitute a cemented lens; the first lens 1 has positive focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens 1 is in a meniscus shape, so that light collection is facilitated, and distortion is reduced; the diaphragm is arranged between the first lens 1 and the second lens 2, so that the aperture of the lens can be reduced; the second lens 2 has negative focal power, so that the reflected light can be smoothly carried, the aberration is reduced, the sensitivity of the lens is reduced, and the aperture of the lens is reduced; the third lens 3 and the sixth lens 6 both have positive focal power, which is beneficial to folding light rays and reducing the length of the lens; the third lens 3 and the fourth lens 4 form a cemented lens, the fifth lens 5 and the sixth lens 6 form a cemented lens, at least one group of cemented lenses reduces or eliminates chromatic aberration, imaging quality is improved, the cemented lens improves lens transmittance, and assembly difficulty is reduced; optical parameters of the low-cost high-definition vehicle-mounted front-view lens provided by the embodiment 3 are shown in table 5;

table 5 optical parameters of low-cost high-definition vehicular front-view lens provided in embodiment 3

From table 5, we can observe that the first lens 1Nd1 is 1.791, the first lens 1Vd1 is 54.900, the first lens Nd1 > 1.79, and vd1 > 35, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the abbe number of the first lens 1;

the second lens 2Nd2 is 1.920, the second lens 2Vd2 is 20.900, the second lens 2Nd2 is more than 1.72, vd2 is less than 29, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the Abbe number of the second lens 2;

the third lens 3Nd3 is 1.750, the third lens 3Vd3 is 52.300, the third lens 3Nd3 is more than 1.74, vd3 is less than 53, wherein Nd3 refers to the refractive index of the third lens 3, and Vd3 refers to the Abbe number of the third lens 3;

the fifth lens Nd5 is 1.600, the fifth lens Vd5 is 39.200, the fifth lens Nd5 is less than 1.76, the Vd5 is less than 53, wherein Nd5 refers to the refractive index of the fifth lens, and Vd5 refers to the Abbe number of the fifth lens;

the seventh lens Nd7 is 1.820, the seventh lens Vd7 is 46.600, the seventh lens Nd7 is more than or equal to 1.8, vd7 is less than 47, wherein Nd7 refers to the refractive index of the seventh lens, and Vd7 refers to the Abbe number of the seventh lens;

a specification summary table of the low-cost high-definition vehicle-mounted front-view lens provided in embodiment 3 is shown in table 6;

table 6 summary of specifications of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 3

	f	BFL	TTL	FOV	h	D
							Example 3	15.44	3.27	32.5	34.4	9.252	11

From table 6, we can observe that BFL/TTL =0.101, the following condition is satisfied: BFL/TTL is more than or equal to 0.1, wherein BFL is the distance from the center of the image side surface of the eighth lens 8 of the high-definition vehicle-mounted forward-looking lens to the imaging surface of the optical lens on the optical axis; TTL is the distance from the center of the object-side surface of the first lens element 1 to the imaging surface of the optical lens on the optical axis, which is favorable for increasing the optical back focus of the lens and leaving sufficient space for the module;

from table 6, we can observe that FOV/h/D =0.338, satisfying the following condition: the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, wherein the FOV is the maximum field angle of the optical lens; d is the maximum light-passing aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens; when the high-definition vehicle-mounted front-view lens meets the following conditions: when the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, the small caliber of the front end lens is favorably realized;

from table 6, we can observe that (FOV × f)/h =57.408 satisfies the following conditional expression: 56 is less than or equal to (FOV xf)/h is less than or equal to 58; the FOV is the maximum view field angle of the high-definition vehicle-mounted forward-looking lens, f is the whole group of focal length values of the optical lens, h is the image height corresponding to the maximum view field angle of the optical lens, and the FOV, the f and the h are controlled to meet the following conditional expression: when the FOV xf/h is more than or equal to 56 and less than or equal to 58, the lens distortion is favorably reduced;

from table 6, we can observe that TTL/f =2.105, the high-definition on-vehicle front-view lens satisfies the conditional expression: TTL/f is not more than 2.2, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the optical lens on the optical axis, and f is the focal length of the whole group of lenses; the miniaturization of the lens is facilitated.

As shown in fig. 6, a field curvature distortion diagram of the low-cost high-definition vehicle-mounted front view lens provided in embodiment 3 is shown in the left side, where the left side is a field curvature graph, the ordinate of the field curvature graph is the field angle, the abscissa is the distance from the image point to the paraxial image plane, T represents the meridional field curvature, S represents the sagittal field curvature, and the field curvature graph shows the distance from the current focal plane or image plane as a function of the field coordinate to the paraxial focal plane, and is divided into the meridional field curvature and the sagittal field curvature; the right image is a distortion curve graph, the ordinate of the distortion graph is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, and reflects the similarity degree of the object image.

Example 4

As shown in fig. 7, the present invention provides a low-cost high-definition vehicular front view lens, which is sequentially provided with 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, an eighth lens 8, a parallel flat plate 10 and an image plane I MA11 along an incident direction of an optical axis, wherein,

the second lens 2 has negative focal power, 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 fourth lens 4 has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface;

the fifth lens 5 has negative focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;

the seventh lens 7 has positive focal power, 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 first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all glass spherical lenses; the third lens 3 and the fourth lens 4 constitute a cemented lens, and the sixth lens 6 and the seventh lens 7 constitute a cemented lens; the first lens 1 has positive focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens 1 is in a meniscus shape, so that light rays can be collected conveniently, and distortion can be reduced; the diaphragm 9 is arranged between the first lens 1 and the second lens 2, so that the aperture of the lens can be reduced; the second lens 2 has negative focal power, so that the reflected light can be smoothly carried, the aberration is reduced, the sensitivity of the lens is reduced, and the aperture of the lens is reduced; the third lens 3 and the sixth lens 6 both have positive focal power, which is beneficial to folding light rays and reducing the length of the lens; the third lens 3 and the fourth lens 4 form a cemented lens, the sixth lens 6 and the seventh lens 7 form a cemented lens, at least one group of cemented lenses reduces or eliminates chromatic aberration, the imaging quality is improved, the cemented lens improves the lens transmittance, and the assembly difficulty is reduced; optical parameters of the low-cost high-definition vehicle-mounted front-view lens provided by the embodiment 4 are shown in table 7;

table 7 optical parameters of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 4

From table 7, we can observe that the first lens 1Nd1 is 1.800, the first lens 1Vd1 is 42.300, the first lens 1Nd1 > 1.79, and vd1 > 35, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the abbe number of the first lens 1;

the second lens 2Nd2 is 1.810, the second lens 2Vd2 is 22.700, the second lens 2Nd2 is more than 1.72, vd2 is less than 29, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the Abbe number of the second lens 2;

the fifth lens 5Nd5 is 1.750, the fifth lens 5Vd5 is 52.300, the fifth lens 5Nd5 < 1.76, and Vd5 < 53, wherein Nd5 refers to the refractive index of the fifth lens 5, and Vd5 refers to the Abbe number of the fifth lens 5;

the seventh lens 7Nd7 is 2.000, the seventh lens 7Vd7 is 25.400, the seventh lens 7Nd7 is more than or equal to 1.8, vd7 is less than 47, wherein Nd7 refers to the refractive index of the seventh lens 7, and Vd7 refers to the Abbe number of the seventh lens 7;

the specification summary table of the low-cost high-definition vehicle-mounted front-view lens provided in embodiment 4 is shown in table 8;

table 8 summary of specifications of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 4

	f	BFL	TTL	FOV	h	D
							Example 4	15.33	3.9	32.5	34.4	9.252	10.1

From table 8, we can observe that BFL/TTL =0.12, the following condition is satisfied: BFL/TTL is more than or equal to 0.1, wherein BFL is the distance from the center of the image side surface of the eighth lens 8 of the high-definition vehicle-mounted forward-looking lens to the imaging surface of the optical lens on the optical axis; TTL is the distance from the center of the object-side surface of the first lens element 1 to the imaging surface of the optical lens on the optical axis, which is beneficial to increasing the optical back focus of the lens and leaving sufficient space for the module;

from table 8, we can observe that FOV/h/D =0.368, satisfies the following condition: the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, wherein the FOV is the maximum field angle of the optical lens; d is the maximum light-passing aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens; when the high-definition vehicle-mounted front-view lens meets the following conditions: when the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, the small caliber of the front end lens is favorably realized;

from table 8, we can observe that (FOV × f)/h =56.999, the following conditional expression is satisfied: 56 is less than or equal to (FOV xf)/h is less than or equal to 58; the FOV is the maximum view field angle of the high-definition vehicle-mounted forward-looking lens, f is the whole group of focal length values of the optical lens, h is the image height corresponding to the maximum view field angle of the optical lens, and the FOV, the f and the h are controlled to meet the following conditional expression: when the FOV xf/h is more than or equal to 56 and less than or equal to 58, the lens distortion is favorably reduced;

from table 8, we can observe that TTL/f =2.120, the high-definition on-vehicle front-view lens satisfies the conditional expression: TTL/f is not more than 2.2, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the optical lens on the optical axis, and f is the focal length of the whole group of lenses; is beneficial to the miniaturization of the lens.

As shown in fig. 8, a field curvature distortion diagram of the low-cost high-definition vehicle-mounted front view lens provided in embodiment 4 is shown in the left side, where the left side is a field curvature graph, the ordinate of the field curvature graph is the field angle, the abscissa is the distance from the image point to the paraxial image plane, T represents the meridional field curvature, S represents the sagittal field curvature, and the field curvature graph shows the distance from the current focal plane or image plane as a function of the field coordinate to the paraxial focal plane, and is divided into the meridional field curvature and the sagittal field curvature; the right image is a distortion curve graph, the ordinate of the distortion graph is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, and reflects the similarity degree of the object image.

Example 5

As shown in fig. 9, the present invention provides a low-cost high-definition vehicular front view lens, which is sequentially provided with 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, an eighth lens 8, a parallel flat plate 10 and an image plane I MA11 along an incident direction of an optical axis, wherein,

the fourth lens 4 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;

the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all glass spherical lenses; the fourth lens 4, the fifth lens 5 and the sixth lens 6 constitute a cemented lens; the first lens 1 has positive focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens 1 is in a meniscus shape, so that light collection is facilitated, and distortion is reduced; the diaphragm 9 is arranged between the first lens 1 and the second lens 2, and is beneficial to reducing the caliber of the lens; the second lens 2 has negative focal power, so that the reflected light can be smoothly carried, the aberration is reduced, the sensitivity of the lens is reduced, and the aperture of the lens is reduced; the third lens 3 and the sixth lens 6 both have positive focal power, which is beneficial to folding light rays and reducing the length of the lens; the fourth lens 4, the fifth lens 5 and the sixth lens 6 form a cemented lens, at least one group of cemented lenses reduces or eliminates chromatic aberration, imaging quality is improved, the cemented lens improves lens transmittance, and assembly difficulty is reduced; optical parameters of the low-cost high-definition vehicle-mounted front-view lens provided in embodiment 5 are shown in table 9;

table 9 optical parameters of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 5

From table 9, we can observe that the first lens 1Nd1 is 1.910, the first lens 1Vd1 is 35.300, the first lens 1Nd1 > 1.79, vd1 > 35, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the abbe number of the first lens 1;

the second lens 2Nd2 is 1.950, the second lens 2Vd2 is 17.900, the second lens 2Nd2 is more than 1.72, vd2 is less than 29, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the Abbe number of the second lens 2;

the third lens 3Nd3 is 1.810, the third lens 3Vd3 is 40.900, the third lens 3Nd3 is more than 1.74, vd3 is less than 53, wherein Nd3 refers to the refractive index of the third lens 3, and Vd3 refers to the Abbe number of the third lens 3;

the fifth lens 5Nd5 is 1.730, the fifth lens 5Vd5 is 28.300, the fifth lens 5Nd5 < 1.76, and Vd5 < 53, wherein Nd5 refers to the refractive index of the fifth lens 5, and Vd5 refers to the Abbe number of the fifth lens 5;

the seventh lens 7Nd7 is 2.000, the seventh lens 7Vd7 is 28.300, the seventh lens 7Nd7 is more than or equal to 1.8, vd7 is less than 47, wherein Nd7 refers to the refractive index of the seventh lens 7, and Vd7 refers to the Abbe number of the seventh lens 7;

the specification summary table of the low-cost high-definition vehicle-mounted front-view lens provided in embodiment 5 is shown in table 10;

table 10 summary of specifications of low-cost high-definition vehicle-mounted front-view lens provided in embodiment 5

	f	BFL	TTL	FOV	h	D
							Example 5	15.24	3.4	32.5	34.4	9.252	10

From table 10, we can observe that BFL/TTL =0.105, the following condition is satisfied: BFL/TTL is more than or equal to 0.1, wherein BFL is the distance from the center of the image side surface of the eighth lens 8 of the high-definition vehicle-mounted forward-looking lens to the imaging surface of the optical lens on the optical axis; TTL is the distance from the center of the object-side surface of the first lens element 1 to the imaging surface of the optical lens on the optical axis, which is beneficial to increasing the optical back focus of the lens and leaving sufficient space for the module;

from table 10, we can observe that FOV/h/D =0.372, satisfies the following condition: the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, wherein the FOV is the maximum field angle of the optical lens; d is the maximum clear aperture of the object side surface of the first lens 1 corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens; when the high-definition vehicle-mounted front-view lens meets the following conditions: when the FOV/h/D is more than or equal to 0.32 and less than or equal to 0.38, the small caliber of the front end lens is favorably realized;

from table 10, we can observe that (FOV × f)/h =56.664, the following conditional expression is satisfied: 56 is less than or equal to (FOV xf)/h is less than or equal to 58; the FOV is the maximum view field angle of the high-definition vehicle-mounted forward-looking lens, f is the whole group of focal length values of the optical lens, h is the image height corresponding to the maximum view field angle of the optical lens, and the FOV, the f and the h are controlled to meet the following conditional expression: when the FOV xf/h is more than or equal to 56 and less than or equal to 58, the lens distortion is favorably reduced;

from table 10, we can observe that TTL/f =2.133, and the high-definition on-vehicle front-view lens satisfies the conditional expression: TTL/f is less than or equal to 2.2, wherein TTL is the distance between the center of the object side surface of the first lens 1 and the imaging surface of the optical lens on the optical axis, and f is the focal length of the whole group of lenses; the miniaturization of the lens is facilitated.

The high-definition vehicle-mounted forward-looking lens meets the conditional expression: f1/f is more than or equal to 1.75 and less than or equal to 3, f2/f is more than or equal to 4 and less than or equal to-0.6, f3/f is more than or equal to 0.6 and less than or equal to 2.4, f6/f is more than or equal to 0.35 and less than or equal to 0.9, wherein f1, f2, f3 and f6 are focal lengths of the first lens 1, the second lens 2, the third lens 3 and the sixth lens 6 in sequence, and f is a focal length of the whole group of lenses; by reasonably matching the focal length of the lens, the assembly sensitivity is favorably reduced, the drift of the lens is controlled in a small range after high and low temperature, and the requirement of clear imaging is met.

As shown in fig. 10, a field curvature distortion diagram of the low-cost high-definition vehicle-mounted front view lens provided in embodiment 5 is shown in the left side, where the left side is a field curvature graph, the ordinate of the field curvature graph is the field angle, the abscissa is the distance from the image point to the paraxial image plane, T represents the meridional field curvature, S represents the sagittal field curvature, and the field curvature graph shows the distance from the current focal plane or image plane as a function of the field coordinate to the paraxial focal plane, and is divided into the meridional field curvature and the sagittal field curvature; the right image is a distortion graph, the ordinate of the distortion graph is the field angle, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, the similarity degree of the object image is reflected, the optical lens in the embodiment has small optical curvature of field, small distortion and clear image.

2) The invention provides a low-cost high-definition vehicle-mounted forward-looking lens and application thereof, wherein the first lens has positive focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens is in a meniscus shape, so that light collection is facilitated, and distortion is reduced; the diaphragm is arranged between the first lens and the second lens, so that the aperture of the lens can be reduced; the second lens has negative focal power, so that the reflected light is more smoothly carried, the aberration is reduced, the sensitivity of the lens is reduced, and the caliber of the lens is reduced; the third lens and the sixth lens both have positive focal power, so that light rays can be favorably refracted, and the length of the lens is reduced;

It is to be understood that the present invention has been described with respect to certain embodiments, and that various changes, modifications, and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all modifications and equivalents falling within the scope of the appended claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A low-cost high-definition vehicle-mounted forward-looking lens is characterized in that a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a parallel flat plate and an image plane IMA are sequentially arranged along the incident direction of an optical axis,

the sixth lens has positive focal power, and the object-side surface of the sixth lens is a convex surface, and the image-side surface of the sixth lens is a convex surface;

2. The vehicle-mounted low-cost high-definition front view lens according to claim 1, wherein at least one of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is a cemented lens.

3. The low-cost high-definition vehicular front-view lens according to claim 1, wherein the first lens Nd1 is more than 1.79, vd1 is more than 35, wherein Nd1 refers to the refractive index of the first lens, and Vd1 refers to the Abbe number of the first lens; the second lens Nd2 is more than 1.72, vd2 is less than 29, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens; the third lens Nd3 is more than 1.74, vd3 is less than 53, wherein Nd3 refers to the refractive index of the third lens, and Vd3 refers to the Abbe number of the third lens; the fifth lens Nd5 is less than 1.76, vd5 is less than 53, wherein Nd5 refers to the refractive index of the fifth lens, and Vd5 refers to the Abbe number of the fifth lens; the seventh lens Nd7 is more than or equal to 1.8, vd7 is less than 47, wherein Nd7 refers to the refractive index of the seventh lens, and Vd7 refers to the Abbe number of the seventh lens.

4. The low-cost high-definition vehicle-mounted front-view lens according to claim 1, wherein the high-definition vehicle-mounted front-view lens meets the following conditions:

BFL/TTL≥0.1，

5. The low-cost high-definition vehicle-mounted front-view lens according to claim 1, wherein the high-definition vehicle-mounted front-view lens meets the following conditions:

0.32≤FOV/h/D≤0.38，

wherein the FOV is the maximum field angle of the optical lens;

d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens; and

6. The low-cost high-definition vehicle-mounted forward-looking lens according to claim 1, wherein the following conditional expression is satisfied among a maximum field angle FOV of the high-definition vehicle-mounted forward-looking lens, a whole group of focal length values f of the optical lens, and an image height h corresponding to the maximum field angle of the optical lens:

56≤(FOV×f)/h≤58。

7. the low-cost high-definition vehicle-mounted front-view lens according to claim 1, wherein the high-definition vehicle-mounted front-view lens meets the conditional expression:

TTL/f≤2.2，

8. The low-cost high-definition vehicle-mounted front-view lens according to claim 1, wherein the high-definition vehicle-mounted front-view lens meets the conditional expression: f1/f is more than or equal to 1.75 and less than or equal to 3, f2/f is more than or equal to 4 and less than or equal to-0.6, f3/f is more than or equal to 0.6 and less than or equal to 2.4, f6/f is more than or equal to 0.35 and less than or equal to 0.9, wherein f1, f2, f3 and f6 are focal lengths of the first lens, the second lens, the third lens and the sixth lens in sequence, and f is a focal length of the whole group of lenses.

9. The low-cost high-definition vehicle-mounted forward-looking lens according to claim 1, wherein a diaphragm is arranged between the first lens and the second lens.

10. A low-cost high-definition vehicle-mounted front-view lens is applied to automatic driving as an automobile front-view system.