CN116107055B

CN116107055B - High-performance optical lens and high-precision laser radar

Info

Publication number: CN116107055B
Application number: CN202211166599.7A
Authority: CN
Inventors: 邢圆圆; 刘凯; 方勇军; 邓志吉; 朱奇峰; 丁乃英
Original assignee: Zhejiang Dahua Technology Co Ltd
Current assignee: Zhejiang Dahua Technology Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-07-07
Anticipated expiration: 2042-09-23
Also published as: CN116107055A

Abstract

The application discloses a high-performance optical lens and a high-precision laser radar, wherein the high-performance optical lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a diaphragm, a lens group, a fourth lens with positive focal power and a fifth lens with negative focal power in sequence from an object side to an image side along an optical axis; the lens group is used for eliminating chromatic aberration; through the mode, the high-performance optical lens has good imaging quality.

Description

High-performance optical lens and high-precision laser radar

Technical Field

The application relates to the technical field of optics, in particular to a high-performance optical lens and a high-precision laser radar.

Background

Due to the high-speed development of automatic driving in recent years, optical lenses are increasingly applied in the field of automatic driving, particularly in the fields of vehicle-mounted lenses, laser radars and the like, and besides the requirements of high pixels and small volume, other requirements of the lenses are also increasingly increased, such as large field angle, long focal length, small FNO, high illumination intensity, small distortion and the like, and the optical lenses need special requirements of performance according to different applications.

However, at present, it is often difficult to achieve better effects at the same time for some performances of the optical lens.

Disclosure of Invention

The technical problem that this application mainly solves is to provide a high performance optical lens and high accuracy laser radar, can make high performance optical lens have better imaging quality.

In order to solve the technical problems, one technical scheme adopted by the application is as follows: providing a high-performance optical lens comprising a first lens having positive optical power sequentially from an object side to an image side along an optical axis; a second lens having positive optical power; a third lens having negative optical power; a diaphragm; a lens group for eliminating chromatic aberration; a fourth lens having positive optical power; a fifth lens having negative optical power.

The lens group is formed by bonding a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side, wherein the sixth lens is a negative focal power lens, and the seventh lens is a positive focal power lens.

The first lens, the second lens, the third lens, the sixth lens and the seventh lens are meniscus lenses, the fourth lens is a biconvex lens, and the fifth lens is a biconcave lens.

Wherein, the structure of at least one lens among the first lens, the second lens, the third lens, the sixth lens and the seventh lens is: the surface close to the object side is a convex surface, and the surface close to the image side is a concave surface.

The first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are spherical lenses, and the fourth lens is an aspherical lens; and/or the abbe number of the sixth lens is less than or equal to 21; and/or the abbe number of the seventh lens is less than or equal to 30.

The preset operation result of the focal length ratio of the lens group and the high-performance optical lens and the function value of the field angle is between 3 and 4, the function value of the field angle is a preset trigonometric function value of a preset multiple of the field angle of the high-performance optical lens, wherein the preset trigonometric function value is a tangent value and the preset operation result is a product, or the preset trigonometric function value is a cotangent value and the preset operation result is a quotient.

Wherein the preset multiple is 2; and/or, the preset operation result is more than or equal to 3.8 and less than or equal to 4.4.

Wherein a ratio of a difference between the second central radius of curvature of the object side surface of the third lens and the first central radius of curvature of the image side surface of the second lens to a sum of the first central radius of curvature and the second central radius of curvature is less than or equal to 0.45; and/or the refractive index of the second lens is less than or equal to 1.7; and/or the refractive index of the third lens is less than or equal to 1.8; and/or the ratio of the focal length of the second lens to the focal length of the high-performance optical lens is less than or equal to 1.6; and/or, the focal length of the first lens is less than or equal to 31.3; and/or, the focal length of the fourth lens is less than or equal to 10.8; and/or, the focal length of the fifth lens is less than or equal to-14.6.

The high-performance optical lens further comprises an optical filter and an imaging surface which are sequentially arranged from an object side to an image side along an optical axis, wherein the optical filter is arranged on one surface of the fifth lens, which is close to the image side; and/or the diaphragm is an aperture diaphragm.

In order to solve the technical problems, another technical scheme adopted by the application is as follows: there is provided a high-precision lidar including the high-performance optical lens and the image sensor described above.

According to the technical scheme, through planning and setting of the lenses in the high-performance optical lens, the high-performance optical lens can be ensured to have high resolution capability and good imaging quality, and the high-performance optical lens can have good distortion control characteristics; in addition, the number of lenses constituting the high-performance optical lens is small, the total length of the high-performance optical lens is shortened, the size of the high-performance optical lens is shortened, and miniaturization of the high-performance optical lens is realized.

Drawings

FIG. 1 is a schematic diagram of a high performance optical lens according to an embodiment of the present disclosure;

FIG. 2 is a graph of the optical transfer function at ambient temperature in the visible light band for example 1 provided herein;

FIG. 3 is a graph of the optical transfer function at ambient temperature in the visible light band for example 2 provided herein;

FIG. 4 is a graph of curvature of field and distortion in the visible light band for example 1 provided herein;

FIG. 5 is a graph of curvature of field and distortion in the visible light band for example 2 provided herein;

FIG. 6 is a transverse fan diagram of example 1 provided herein in the visible light band;

FIG. 7 is a transverse fan diagram of example 2 provided herein in the visible light band;

FIG. 8 is a dot column diagram of example 1 provided herein in the visible light band;

fig. 9 is a dot column diagram of example 2 provided in the present application in the visible light band.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is only for descriptive purposes, and is not to be construed as indicating or implying relative importance or implying that the number of technical features indicated is indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a high performance optical lens provided in the present application. The high performance optical lens 100 includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a STOP, a lens group G1, a fourth lens L4, and a fifth lens L5; wherein, the first lens L1, the second lens L2 and the fourth lens L4 have positive optical power, the third lens L3 and the fifth lens L5 have negative optical power, and the lens group G1 can play a role in eliminating chromatic aberration. By planning and setting the lenses in the high-performance optical lens 100, the high-performance optical lens 100 can be ensured to have high resolution capability and good imaging quality, and the high-performance optical lens 100 can have good distortion control characteristics; in addition, the number of lenses constituting the high-performance optical lens 100 is small, the total lens length of the high-performance optical lens 100 is shortened, the size of the high-performance optical lens 100 is shortened, and the miniaturization of the high-performance optical lens 100 is realized; in addition, the high-performance optical lens 100 provided by the application can support the use of a large-target-surface image Sensor (Sensor) and a large aperture, and compared with a small-target-surface Sensor, the large-target-surface Sensor has a larger single pixel size and a higher pixel number, so that a shot picture is clearer, the imaging quality of the high-performance optical lens 100 is improved, and the high-performance optical lens 100 can receive more light rays at one time due to the use of the large aperture, so that the high-performance optical lens 100 can adapt to shooting requirements under low-light or dim light conditions; in addition, the high-performance optical lens 100 provided by the application can be suitable for being used in various temperature environments, and the application range is wider.

The optical power represents the ability of the optical system to deflect light, and is equal to the difference between the convergence of the light beam at the image side and the convergence of the light beam at the object side; when the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. The optical power may be suitable for characterizing a refractive surface of a lens (i.e., a surface of a lens), or may be suitable for characterizing a lens, or may be suitable for characterizing a high performance optical lens 100 formed by a plurality of lenses together.

With continued reference to fig. 1, since the first lens L1 has positive focal power, the positive focal power lens converges light, so that the first lens L1 can collect light in the field of view and make the light enter other lenses behind.

In an embodiment, the first lens L1 is a meniscus lens, which can better collect the light in the field of view, and the meniscus lens is convenient to process and has low cost, thereby reducing the cost of the high performance optical lens 100. In an embodiment, the first lens L1 is a meniscus lens, a surface of the first lens L1 near the object side is a convex surface, and a surface of the first lens L1 near the image side is a concave surface, and the arrangement of the first lens L1 near the convex surface of the object side is beneficial to collect light in the field of view into the high-performance optical lens 100 as much as possible; on the other hand, the convex surface is also beneficial to adapting to the outdoor use scene of the high-performance optical lens 100, for example, outdoor water drops or water vapor can slide along the convex surface, so as to reduce the influence of outdoor environmental factors on the imaging quality of the high-performance optical lens 100. It can be appreciated that, in other embodiments, the first lens L1 is a meniscus lens, a surface of the first lens L1 near the object side is a concave surface and a surface of the first lens L1 near the image side is a convex surface, and the arrangement of the concave surface of the first lens L1 near the object side is beneficial to reducing the front end caliber of the high performance optical lens 100, thereby reducing the size of the high performance optical lens 100. It is to be understood that, in other embodiments, the first lens L1 may also be a lens in a biconvex or plano-convex form, which is not specifically limited herein; when the first lens L1 is a lens in a plano-convex form, the convex surface of the first lens L1 may be disposed near the object side or near the image side, which is not particularly limited herein.

In an embodiment, the focal length of the first lens L1 is less than or equal to 31.3, for example, the focal length of the first lens L1 is 31.24, 31.14, etc. The first lens L1 has a longer focal length, and can collect more light for focusing, so as to improve the light flux entering the high-performance optical lens 100. The specific inequality corresponding to the focal length of the first lens L1 is as follows:

wherein, the liquid crystal display device comprises a liquid crystal display device,

the focal length of the first lens L1 is indicated.

In one embodiment, the first lens L1 is a spherical lens. Of course, in other embodiments, the first lens L1 may be an aspherical lens or the like, and is not particularly limited herein. The lens used for the first lens L1 may be a plastic lens or a glass lens, and is not particularly limited herein. Because the thermal expansion coefficient of the plastic lens is larger, when the environmental temperature used by the lens is changed greatly, the plastic lens can have a larger influence on the overall performance of the high-performance optical lens 100; the glass lens can reduce the influence of temperature on the overall performance of the high-performance optical lens 100, reduce the tolerance sensitivity of the first lens L1 and facilitate the heat difference elimination treatment, so that the high-performance optical lens 100 can be suitable for different temperature environments, thereby improving the overall performance of the high-performance optical lens 100.

With continued reference to fig. 1, since the second lens L2 has positive focal power, the lens with positive focal power converges light, so that the second lens L2 can further converge light passing through the first lens L1, on one hand, the convergence of light is enhanced, and the light is prevented from being excessively diverged, so that the light smoothly enters the lens at the rear; on the other hand, the aperture of the third lens L3 is advantageously reduced.

In an embodiment, the second lens L2 is a meniscus lens, which can better collect the light collected by the first lens L1, and the meniscus lens is convenient for processing and has low cost, so as to reduce the cost of the high-performance optical lens 100. In an embodiment, the second lens L2 is a meniscus lens, a surface of the second lens L2 near the object side is a convex surface, and a surface of the second lens L2 near the image side is a concave surface, so that the second lens L2 near the convex surface of the object side is beneficial to collecting the light collected by the first lens L1 as much as possible; in addition, when the first lens L1 is a meniscus lens and the surface of the first lens L1 close to the object side is a convex surface and the surface of the second lens L2 close to the image side is a concave surface, the distance between the first lens L1 and the second lens L2 can be reduced, so that the physical overall length of the high-performance optical lens 100 can be shortened, and the high-performance optical lens 100 can be miniaturized. It is understood that in other embodiments, the second lens L2 is a meniscus lens, and the second lens L2 may be disposed with a concave surface near the object side and a convex surface near the image side. It is to be understood that, in other embodiments, the second lens L2 may also be a lens in a biconvex or plano-convex form, which is not specifically limited herein; when the second lens L2 is a lens in a plano-convex form, the convex surface of the second lens L2 may be disposed near the object side or near the image side, which is not particularly limited herein.

In an embodiment, the ratio between the focal length of the second lens L2 and the focal length of the high-performance optical lens 100 is less than or equal to 1.6, for example, the ratio between the focal length of the second lens L2 and the focal length of the high-performance optical lens 100 is 1.54 or 1.38. When the ratio between the focal length of the second lens L2 and the focal length of the high-performance optical lens 100 is less than or equal to 1.6, on the one hand, the imaging quality of the high-performance optical lens 100 can be improved; on the other hand, the overall structure of the high-performance optical lens 100 can be made compact, and miniaturization of the high-performance optical lens 100 can be realized; and, the cost overhead can be reduced. The specific inequality corresponding to the ratio between the focal length of the second lens L2 and the focal length of the high-performance optical lens 100 is as follows:

representing the focal length of the second lens L2;

representing the focal length of the high performance optical lens 100.

In an embodiment, the refractive index of the second lens L2 is less than or equal to 1.7, and the refractive index of the second lens L2 is smaller, so that the light can be more smoothly transferred to the third lens L3. The specific inequality corresponding to the refractive index of the second lens L2 is as follows:

the refractive index of the second lens L2 is shown.

In an embodiment, a ratio of a difference between the second central radius of curvature of the object-side surface of the third lens L3 and the first central radius of curvature of the image-side surface of the second lens L2 to a sum of the first central radius of curvature and the second central radius of curvature is less than or equal to 0.45, e.g., a ratio of a difference between the second central radius of curvature of the object-side surface of the third lens L3 and the first central radius of curvature of the image-side surface of the second lens L2 to a sum of the first central radius of curvature and the second central radius of curvature is 0.44 or 0.34, etc. By disposing the center radii of curvature of the second lens L2 and the third lens L3, aberrations of the high-performance optical lens 100 can be reduced, and distortion can be reduced. The specific inequality corresponding to the ratio of the difference between the second central radius of curvature of the object side surface of the third lens L3 and the second central radius of curvature of the image side surface of the second lens L2 to the sum of the first central radius of curvature and the second central radius of curvature is as follows:

a second center radius of curvature representing an object-side surface of the third lens L3;

the first central radius of curvature of the image side of the second lens L2 is indicated. The object side surface of the lens is a surface of the lens facing the object side, and the image side surface of the lens is a surface of the lens facing the image side.

In one embodiment, the second lens L2 is a spherical lens. Of course, in other embodiments, the second lens L2 may be an aspherical lens or the like, and is not particularly limited herein. The lens used for the second lens L2 may be a plastic lens or a glass lens, and is not particularly limited herein. Because the thermal expansion coefficient of the plastic lens is larger, when the environmental temperature used by the lens is changed greatly, the plastic lens can have a larger influence on the overall performance of the high-performance optical lens 100; the glass lens can reduce the influence of temperature on the overall performance of the high-performance optical lens 100, reduce the tolerance sensitivity of the second lens L2 and facilitate the heat difference elimination treatment, so that the high-performance optical lens 100 can be suitable for different temperature environments, thereby improving the overall performance of the high-performance optical lens 100.

With continued reference to fig. 1, since the third lens L3 has negative optical power, the negative optical power lens diverges light, and the third lens L3 is configured to properly diverge light converged by the second lens L2, so as to smoothly transition the collected light into the following lens.

In an embodiment, the third lens L3 is a meniscus lens, which can better collect the light converged by the second lens L2 and smoothly transition to the rear lens, and the meniscus lens is convenient to process and has low cost, thereby reducing the cost of the high-performance optical lens 100. In an embodiment, the third lens L3 is a meniscus lens, a surface of the third lens L3 near the object side is a convex surface, and a surface of the third lens L3 near the image side is a concave surface, so that the light collected by the second lens L2 is collected as much as possible due to the arrangement of the third lens L3 near the convex surface of the object side; in addition, when the second lens L2 is a meniscus lens and the surface of the second lens L2 close to the object side is a convex surface and the surface of the third lens L3 close to the image side is a concave surface, the distance between the second lens L2 and the third lens L3 can be reduced, so that the physical overall length of the high-performance optical lens 100 can be shortened, and the high-performance optical lens 100 can be miniaturized. It is to be understood that, in other embodiments, the third lens L3 is a meniscus lens, and the third lens L3 may be disposed with a concave surface near the object side and a convex surface near the image side. It is to be understood that, in other embodiments, the third lens L3 may be a lens in a biconvex or plano-convex form, which is not particularly limited herein; when the third lens L3 is a lens in a plano-convex form, the convex surface of the third lens L3 may be disposed near the object side or near the image side, which is not particularly limited herein.

In an embodiment, the refractive index of the third lens L3 is less than or equal to 1.8, for example, the refractive index of the third lens L3 is 1.72, 1.73, or the like. The third lens L3 has a smaller refractive index, and can more smoothly transition light rays to the lens group G1. The specific inequality of the refractive index of the third lens L3 is as follows:

the refractive index of the third lens L3 is shown.

In an embodiment, the third lens L3 is a spherical lens. Of course, in other embodiments, the third lens L3 may be an aspherical lens or the like, and is not particularly limited herein. The lens used for the third lens L3 may be a plastic lens or a glass lens, and is not particularly limited herein. Because the thermal expansion coefficient of the plastic lens is larger, when the environmental temperature used by the lens is changed greatly, the plastic lens can have a larger influence on the overall performance of the high-performance optical lens 100; the glass lens can reduce the influence of temperature on the overall performance of the high-performance optical lens 100, reduce the tolerance sensitivity of the third lens L3 and facilitate the heat difference elimination treatment, so that the high-performance optical lens 100 can be suitable for different temperature environments, thereby improving the overall performance of the high-performance optical lens 100.

With continued reference to fig. 1, a STOP is disposed between the third lens L3 and the lens group G1, where the STOP is used for converging the light entering the high-performance optical lens 100, so as to further improve the imaging quality of the high-performance optical lens 100 and reduce the aperture of the lens in the high-performance optical lens 100. In one embodiment, STOP may be an aperture STOP; of course, in other embodiments, the STOP may be a field STOP or the like, and is not particularly limited herein.

With continued reference to fig. 1, a lens group G1 is disposed behind the STOP, so that on one hand, aberration generated by the front lens can be corrected, and chromatic aberration can be eliminated, and tolerance sensitivity of the high-performance optical lens 100 can be reduced, thereby improving imaging quality of the high-performance optical lens 100; on the other hand, the total length of the high-performance optical lens 100 can be shortened and the aperture of the lens in the high-performance optical lens 100 can be reduced. In an embodiment, the lens group G1 is formed by bonding a sixth lens L6 and a seventh lens L7 sequentially disposed from the object side to the image side, so that the distance between the sixth lens L6 and the seventh lens L7 is shortened, and the overall size of the high-performance optical lens 100 is reduced, so that the overall structure of the high-performance optical lens 100 is compact, and miniaturization of the high-performance optical lens 100 is achieved; the sixth lens L6 is a negative power lens, and the seventh lens L7 is a positive power lens, so that the lens group G1 can not only eliminate chromatic aberration, but also converge light rays again, that is, can increase the aperture of the high-performance optical lens 100, shorten the total length of the high-performance optical lens 100, and make the high-performance optical lens 100 more compact.

In an embodiment, the preset operation result of the focal length ratio and the field angle function of the lens group G1 and the high performance optical lens 100 is between 3 and 4, and the field angle function value is a preset trigonometric function value of a preset multiple of the field angle of the high performance optical lens 100; the preset trigonometric function value is a tangent value and the preset operation result is a product, or the preset trigonometric function value is a cotangent value and the preset operation result is a quotient. By specifically configuring the relationship between the focal length ratio and the angle of view of the lens group G1 and the high-performance optical lens 100, the high-performance optical lens 100 can achieve long focus and a large angle of view, and the high resolution, large target surface, low cost, large aperture, and other characteristics of the high-performance optical lens 100 can be achieved.

When the field angle function is a sine function, the field angle function value is a tangent value corresponding to a field angle of a preset multiple, and the preset operation result of the focal length ratio of the lens group G1 and the high-performance optical lens 100 and the field angle function is a product of the focal length ratio of the lens group G1 and the high-performance optical lens 100 and the tangent value corresponding to the field angle of the preset multiple. When the angle of view function is a cosine function, the angle of view function value is a cotangent value corresponding to a preset multiple of angle of view, and the preset operation result of the focal length ratio of the lens group G1 and the high-performance optical lens 100 and the angle of view function at this time is a quotient of the focal length ratio of the lens group G1 and the high-performance optical lens 100 and the cotangent value corresponding to the preset multiple of angle of view.

In one embodiment, the predetermined multiple is 2. Of course, in other specific embodiments, the preset multiple may be 2.5, 3, etc., which is not limited herein. In one embodiment, the predetermined operation result is greater than or equal to 3.8 and less than or equal to 4.4.

When the preset operation result of the angle of view function is greater than or equal to 3.8 and less than or equal to 4.4, the angle of view function value is a tangent value 2 times the angle of view of the high-performance optical lens 100, and the preset operation result is a product, the focal length ratio of the lens group G1 and the high-performance optical lens 100 and the angle of view function satisfy the following relationship:

a focal length ratio of the lens group G1 to the high-performance optical lens 100;

the field angle of the high performance optical lens 100 is shown.

In an embodiment, the abbe number of the sixth lens L6 is less than or equal to 21, for example, the abbe number of the sixth lens L6 is 17.98, 20.36, or the like. The sixth lens L6 has a higher abbe number, which is advantageous in reducing the overall chromatic aberration of the high-performance optical lens 100. In an embodiment, the abbe number of the seventh lens L7 is less than or equal to 30, for example, the abbe number of the seventh lens L7 is 25.46, 29.13, or the like. The seventh lens L7 has a high abbe number, and is useful for reducing the overall chromatic aberration of the high-performance optical lens 100. In a specific embodiment, the abbe number of the sixth lens L6 is less than or equal to 21 and the abbe number of the seventh lens L7 is less than or equal to 30, the abbe number of the seventh lens L7 with positive optical power is higher than the abbe number of the sixth lens L6 with negative optical power, and the matching of high and low abbe numbers is beneficial to the rapid transition of the front light, increases the caliber of the STOP, and meets the night vision requirement; in addition, the use of the lens group G1 in which the sixth lens L6 and the seventh lens L7 are cemented can make the overall structure of the high-performance optical lens 100 compact, and can reduce chromatic aberration of the high-performance optical lens 100.

The specific inequality corresponding to the abbe numbers of the sixth lens L6 and the seventh lens L7 is as follows:

an abbe number of the sixth lens L6;

the abbe number of the seventh lens L7.

It is to be understood that, in other embodiments, the sixth lens L6 and the seventh lens L7 may also form the lens group G1 in other manners, which is not particularly limited herein. It will be appreciated that in other embodiments, the lens group G1 may be formed by gluing three or four equal lenses or by other means, and is not particularly limited herein.

In an embodiment, the sixth lens L6 and the seventh lens L7 are meniscus lenses, and the meniscus lenses are easy to process and have low cost, thereby reducing the cost of the high performance optical lens 100. In one embodiment, the sixth lens element L6 and the seventh lens element L7 are meniscus lenses, wherein a surface of the sixth lens element L6 close to the object side is convex and a surface of the seventh lens element L7 close to the image side is concave. It is to be understood that, in other embodiments, the sixth lens L6 and the seventh lens L7 are meniscus lenses, the sixth lens L6 is disposed with a concave surface on a side close to the object side and a convex surface on a side close to the image side, and the seventh lens L7 is disposed with a concave surface on a side close to the object side and a convex surface on a side close to the image side. It is to be understood that, in other embodiments, the sixth lens L6 and the seventh lens L7 may be plano-convex or plano-concave lenses, which are not particularly limited herein.

In one embodiment, the sixth lens L6 and the seventh lens L7 are spherical lenses. Of course, in other embodiments, the sixth lens L6 and the seventh lens L7 may be aspherical lenses, and are not particularly limited herein. In one embodiment, the lenses used for the sixth lens L6 and the seventh lens L7 may be plastic lenses or glass lenses, and are not particularly limited herein. Because the thermal expansion coefficient of the plastic lens is larger, when the environmental temperature used by the lens is changed greatly, the plastic lens can have a larger influence on the overall performance of the high-performance optical lens 100; the glass lens can reduce the influence of temperature on the overall performance of the high-performance optical lens 100, reduce the tolerance sensitivity of the sixth lens L6 and the seventh lens L7, and facilitate the heat difference elimination treatment, so that the high-performance optical lens 100 can be suitable for different temperature environments, thereby improving the overall performance of the high-performance optical lens 100.

With continued reference to fig. 1, since the fourth lens element L4 has positive optical power, the lens element with positive optical power converges light, and the fourth lens element L4 is configured to converge light passing through the lens group G1, so as to shorten a distance from a center of an object-side surface of the first lens element L1 of the high-performance optical lens 100 to an image-side surface of the high-performance optical lens 100, and to facilitate controlling an aperture of the high-performance optical lens 100.

In one embodiment, the fourth lens L4 is a biconvex lens. By setting the fourth lens L4 as a biconvex lens, on the one hand, it is possible to achieve converging of marginal rays transiting via the lens group G1, thereby shortening the distance from the center of the object side face of the first lens L1 of the high-performance optical lens 100 to the image side face of the high-performance optical lens 100 while facilitating control of the aperture of the high-performance optical lens 100; on the other hand, the front light can be quickly converged to the rear lens, so that the imaging quality and the imaging speed are improved. It is to be understood that, in other embodiments, the fourth lens L4 may be a plano-convex lens, a meniscus lens, or the like, which is not specifically limited herein, and may be specifically set according to actual use needs.

In an embodiment, the fourth lens L4 is an aspherical lens, and the curvature of the aspherical lens continuously varies from the center of the lens to the periphery, and the aspherical lens has a better radius of curvature characteristic, and has the advantages of improving distortion aberration and astigmatism, and can eliminate aberration occurring during imaging as much as possible, unlike a spherical lens having a constant curvature from the center of the lens to the periphery, thereby improving the imaging quality of the high performance optical lens 100. Therefore, configuring the fourth lens L4 as an aspherical lens can improve aberration, reduce distortion, and thereby improve imaging quality of the high-performance optical lens 100. It is to be understood that in other embodiments, the fourth lens L4 may be a spherical lens or the like, which is not particularly limited herein.

In an embodiment, the focal length of the fourth lens L4 is less than or equal to 10.8, for example, the focal length of the fourth lens L4 is 10.67, 10.78, etc. By setting the focal length of the fourth lens L4 to 10.8 or less, the imaging quality of the high-performance optical lens 100 can be improved. The specific inequality corresponding to the focal length of the fourth lens L4 is as follows:

the focal length of the fourth lens L4 is indicated.

In order to enhance the performance of the high-performance optical lens 100 in the high-low temperature environment, in an embodiment, the fourth lens L4 may be made of a material having a large dn/dt coefficient. It will be appreciated that in other embodiments, the performance of the high performance optical lens 100 in high and low temperature environments may be enhanced by performing other treatments or using other materials on the fourth lens L4.

With continued reference to fig. 1, since the fifth lens L5 has negative focal power, the lens with negative focal power diverges light, and the arrangement of the fifth lens L5 can properly diverge light converged by the fourth lens L4, so as to smoothly transition light for matching with a large-sized chip, which is helpful for achieving higher resolution and a larger adjustable focusing range.

In an embodiment, the fifth lens L5 is a biconcave lens. By setting the fifth lens L5 as a biconcave lens, it is possible to achieve appropriate divergence of the light rays transited via the fourth lens L4 to match a large-sized chip, improving imaging quality and imaging speed. It is to be understood that, in other embodiments, the fifth lens L5 may be a plano-concave or meniscus lens, etc., which is not specifically limited herein, and may be specifically set according to actual use needs.

In an embodiment, the focal length of the fifth lens L5 is less than or equal to-14.6, e.g., the focal length of the fifth lens L5 is-14.70, -14.89, etc. Setting the focal length of the fifth lens L5 to-14.6 or less can improve the imaging quality of the high-performance optical lens 100. The specific inequality corresponding to the focal length of the fifth lens L5 is as follows:

the focal length of the fifth lens L5 is indicated.

In one embodiment, the fifth lens L5 is a spherical lens. Of course, in other embodiments, the fifth lens L5 may be an aspherical lens or the like, and is not particularly limited herein. In one embodiment, the lens used for the fifth lens L5 may be a plastic lens or a glass lens, and is not particularly limited herein. Because the thermal expansion coefficient of the plastic lens is larger, when the environmental temperature used by the lens is changed greatly, the plastic lens can have a larger influence on the overall performance of the high-performance optical lens 100; the glass lens can reduce the influence of temperature on the overall performance of the high-performance optical lens 100, reduce the tolerance sensitivity of the fifth lens L5 and facilitate the heat difference elimination treatment, so that the high-performance optical lens 100 can be suitable for different temperature environments, thereby improving the overall performance of the high-performance optical lens 100.

With continued reference to fig. 1, in an embodiment, the high performance optical lens 100 further includes an optical filter and an imaging plane sequentially disposed from an object side to an image side along an optical axis, the optical filter is disposed on a surface of the fifth lens L5 near the image side, and the optical filter can absorb certain wavelengths, so that the optical filter can filter out light that affects the imaging quality of the high performance optical lens 100, thereby improving the imaging quality of the high performance optical lens 100.

The following illustrates the effects of the high-performance optical lens 100 in the present embodiment.

Example 1:

table 1 table of related parameters of high performance optical lens

Note that, in the schematic structural diagram of the high-performance optical lens 100 shown in fig. 1, the mirror numbers in table 1 are the numbers of the lenses from left to right.

TABLE 2 polynomial coefficients of each order of aspherical surfaces

Mirror number

A

B

C

D

E

F

11

1.085E-04

-3.221E-05

7.206E-07

6.996E-10

5.367E-10

-6.097E-11

12

-2.455E-04

-5.090E-06

-2.535E-07

1.625E-08

2.361E-10

-2.501E-11

In embodiment 1, the high performance optical lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a STOP, a lens group G1, a fourth lens L4, a fifth lens L5, the lens group G1 being cemented with a sixth lens L6 and a seventh lens L7 arranged in order from the object side to the image side; the first lens L1, the second lens L2, the third lens L3, the sixth lens L6 and the seventh lens L7 are meniscus lenses, the fourth lens L4 is a biconvex lens, and the fifth lens L5 is a biconcave lens; the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, and the seventh lens L7 have convex surfaces on the object side and concave surfaces on the image side.

In embodiment 1, the sixth lens L6 and the seventh lens L7 are cemented into the lens group G1, and the focal length of the lens group G1 is

The high performance optical lens 100 has a focal length of

The angle of view of the high performance optical lens 100 is FOV, which satisfies

The method comprises the steps of carrying out a first treatment on the surface of the First center radius of curvature of image side of second lens L2 of high-performance optical lens 100

Second center radius of curvature with object side surface of third lens L3

Satisfies the requirements therebetween

The method comprises the steps of carrying out a first treatment on the surface of the Focal length of the second lens L2

Focal length with high performance optical lens 100

Satisfies the requirements therebetween

The method comprises the steps of carrying out a first treatment on the surface of the Focal length of first lens L1 of high-performance optical lens 100

Satisfy the following requirements

The method comprises the steps of carrying out a first treatment on the surface of the Focal length of fourth lens L4

Satisfy the following requirements

The method comprises the steps of carrying out a first treatment on the surface of the Focal length of fifth lens L5

Satisfy the following requirements

The method comprises the steps of carrying out a first treatment on the surface of the Abbe number of sixth lens L6 of high-performance optical lens 100

Satisfy the following requirements

The method comprises the steps of carrying out a first treatment on the surface of the Abbe number of seventh lens L7

Satisfy the following requirements

The method comprises the steps of carrying out a first treatment on the surface of the Refractive index of second lens L2 of high-performance optical lens 100

Satisfy the following requirements

The method comprises the steps of carrying out a first treatment on the surface of the Refractive index of third lens L3

Satisfy the following requirements

. In addition, in embodiment 1, the high-performance optical lens 100 further has the following optical specifications: the total optical length is TTL less than or equal to 28.95mm; focal length of high performance optical lens 100

20mm; the field angle FOV of the high performance optical lens 100 is 29.6 °; the optical distortion of the high performance optical lens 100 is 6.88%; the aperture of the high-performance optical lens 100 is FNO less than or equal to 1.6; the image plane size of the high performance optical lens 100 is phi 11.2mm.

In embodiment 1, the fourth lens L4 in the high-performance optical lens 100 is an aspherical lens, and the aspherical lens may be defined by the following aspherical formula, but is not limited to the following method:

wherein Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the radius of curvature of the center; k is a fitting cone coefficient; a-F are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th order coefficients of the aspherical polynomial, as shown in table 2.

Example 2:

table 3 table of related parameters of high performance optical lens

Note that, in the schematic structural diagram of the high-performance optical lens 100 shown in fig. 1, the mirror numbers in table 3 are the numbers of the lenses from left to right.

TABLE 4 polynomial coefficients of the order of the aspherical surfaces

Mirror number

A

B

C

D

E

F

11

1.037E-04

-3.195E-05

6.590E-07

2.780E-09

3.084E-10

-5.898E-11

12

-2.572E-04

-5.392E-06

-2.732E-07

1.545E-08

1.456E-10

-2.432E-11

In embodiment 2, the high performance optical lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a STOP, a lens group G1, a fourth lens L4, a fifth lens L5, the lens group G1 being cemented with a sixth lens L6 and a seventh lens L7 arranged in order from the object side to the image side; the first lens L1, the second lens L2, the third lens L3, the sixth lens L6 and the seventh lens L7 are meniscus lenses, the fourth lens L4 is a biconvex lens, and the fifth lens L5 is a biconcave lens; the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, and the seventh lens L7 have convex surfaces on the object side and concave surfaces on the image side.

In embodiment 2, the sixth lens L6 and the seventh lens L7 are cemented into the lens group G1, and the focal length of the lens group G1 is

The high performance optical lens 100 has a focal length of

Second center radius of curvature with object side surface of third lens L3

Satisfies the requirements therebetween

Focal length with high performance optical lens 100

Satisfies the requirements therebetween

Satisfy the following requirements

Satisfy the following requirements

Satisfy the following requirements

Satisfy the following requirements

Satisfy the following requirements

Satisfy the following requirements

Satisfy the following requirements

. In addition, in embodiment 2, the high-performance optical lens 100 further has the following optical specifications: the total optical length is TTL less than or equal to 31.5mm; focal length of high performance optical lens 100

22mm; the field angle FOV of the high performance optical lens 100 is 27.1 °; the optical distortion of the high performance optical lens 100 is 6.26%; the aperture of the high-performance optical lens 100 is FNO less than or equal to 1.6; the image plane size of the high performance optical lens 100 is phi 11.2mm.

In embodiment 2, the fourth lens L4 in the high-performance optical lens 100 is an aspherical lens, and the aspherical lens may be defined by the following aspherical formula, but is not limited to the following method:

wherein Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the radius of curvature of the center; k is a fitting cone coefficient; a-F are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th order coefficients of the aspherical polynomial, as shown in table 4.

Combining example 1 and example 2, table 5 was obtained, as follows:

further, the high performance optical lens 100 in embodiment 1 and embodiment 2 was subjected to a correlation test.

Referring to fig. 2 and 3, fig. 2 is a graph of an optical transfer function of example 1 provided in the present application at normal temperature in the visible light band, and fig. 3 is a graph of an optical transfer function of example 2 provided in the present application at normal temperature in the visible light band. The optical transfer function (MTF) is a more accurate, intuitive and common way to evaluate the imaging quality of a high performance optical lens 100, and the higher and smoother the curve, which indicates that the better the imaging quality of the high performance optical lens 100, the better the correction of various aberrations (e.g., spherical aberration, coma, astigmatism, field curvature, axial chromatic aberration, vertical chromatic aberration, etc.). As shown in fig. 2 and 3, the optical transfer function curve graph of the high-performance optical lens 100 in the normal temperature state of the visible light part is smoother and more concentrated, and the MTF average value of the full field of view (half image height Y' =5.6 mm) reaches more than 0.4. As can be seen, the high performance optical lens 100 provided in the present application can achieve higher imaging requirements.

Referring to fig. 4 and 5, fig. 4 is a graph of curvature of field and distortion in the visible light band for example 1 provided in the present application, and fig. 5 is a graph of curvature of field and distortion in the visible light band for example 2 provided in the present application. The curvature of field of the high performance optical lens 100 is controlled within + -0.04 mm, the field Qu Youchen is "curvature of field", when the high performance optical lens 100 is in curvature of field, the intersection point of the whole light beam does not coincide with an ideal image point, and although a clear image point can be obtained at each specific point, the whole image plane is a curved surface. In the figure, T represents meridian field curvature, and S represents sagittal field curvature; the field curvature curve shows the distance of the current focal plane or image plane to the paraxial focal plane as a function of the field coordinates, the meridian field curvature data being the distance measured along the Z-axis from the currently determined focal plane to the paraxial focal plane and being measured on the meridian (YZ-plane); the sagittal field curvature data measures the distance measured in a plane perpendicular to the meridian plane, the base line in the diagram being on the optical axis, the top of the curve representing the maximum field of view (angle or height), and no units being placed on the longitudinal axis, since the curve is always normalized by the maximum radial field of view.

In addition, as can be seen from fig. 4 and 5, the high performance optical lens 100 provided in the present application has better distortion control, which is within 7%. In general, the distortion of the high performance optical lens 100 is actually a generic term for perspective distortion inherent to the optical lens, that is, distortion due to perspective, which is very unfavorable for the imaging quality of a photograph, and after all, the purpose of photographing is to reproduce, not exaggerate, but because it is inherent characteristics of the lens (convex lens converging light, concave lens diverging light), it cannot be eliminated and can only be improved. As can be seen from fig. 4, the distortion of the fixed focus lens in embodiment 1 is only 6.88%, and the distortion of the fixed focus lens in embodiment 2 is only 6.26%, so that the distortion is set to balance the focal length, the angle of view and the size of the corresponding camera target surface, and the deformation caused by the distortion can be corrected by post image processing.

Referring to fig. 6 and 7, fig. 6 is a cross-sectional view of embodiment 1 provided in the present application in the visible light band, and fig. 7 is a cross-sectional view of embodiment 2 provided in the present application in the visible light band. As can be seen from fig. 6 and 7, the curves in the optical fan diagrams are concentrated, and the spherical aberration and chromatic dispersion of the high-performance optical lens 100 provided by the present application are also well controlled.

Referring to fig. 8 and 9, fig. 8 is a point chart of example 1 provided in the present application in the visible light band, and fig. 9 is a point chart of example 2 provided in the present application in the visible light band. As can be seen from fig. 8 and 9, the high-performance optical lens 100 provided in the present application has a smaller spot radius, is also relatively concentrated, and has good corresponding aberration and coma aberration.

In contrast to the prior art, the present application provides a high performance optical lens including, in order from an object side to an image side along an optical axis, a first lens having positive optical power, a second lens having positive optical power, a third lens having negative optical power, a stop, a lens group, a fourth lens having positive optical power, and a fifth lens having negative optical power; wherein, the lens group is used for eliminating chromatic aberration. Through planning and setting the lenses in the high-performance optical lens, the high-performance optical lens can be ensured to have high resolution capability and good imaging quality, and the high-performance optical lens can have good distortion control characteristics; in addition, the number of lenses forming the high-performance optical lens is small, the total length of the high-performance optical lens is shortened, the size of the high-performance optical lens is shortened, and the miniaturization of the high-performance optical lens is realized; in addition, the high-performance optical lens can support the use of the sensor with the large target surface and the large aperture, and compared with the sensor with the small target surface, the sensor with the large target surface has larger single pixel size and higher pixel number, so that a shot picture is clearer, the imaging quality of the high-performance optical lens is improved, and the use of the large aperture can enable the high-performance optical lens to receive more light rays at one time, so that the high-performance optical lens can adapt to shooting requirements under low-light or dim-light conditions; in addition, the high-performance optical lens can be suitable for being used in various temperature environments, and the application range is wider.

The application also provides a high-precision laser radar. The high-precision lidar includes the high-performance optical lens 100 and the image sensor in any of the above embodiments. Due to the planning and setting of the lenses in the high-performance optical lens 100, the high-performance optical lens 100 can be ensured to have high resolution capability and good imaging quality, and the high-performance optical lens 100 can have good distortion control characteristics; in addition, the number of lenses constituting the high-performance optical lens 100 is small, the total lens length of the high-performance optical lens 100 is shortened, the size of the high-performance optical lens 100 is shortened, and the miniaturization of the high-performance optical lens 100 is realized; in addition, the high-performance optical lens 100 provided by the application can support the use of the sensor with a large target surface and the large aperture, and compared with the sensor with a small target surface, the sensor with the large target surface has larger single pixel size and higher pixel number, so that a shot picture is clearer, the imaging quality of the high-performance optical lens 100 is improved, and the use of the large aperture can enable the high-performance optical lens 100 to receive more light rays at one time, so that the high-performance optical lens 100 can adapt to shooting requirements under low-light or dim-light conditions; in addition, the high-performance optical lens 100 provided by the application can be suitable for being used in various temperature environments, and the application range is wider. The high-precision laser radar provided by the application also has the above effects correspondingly.

If the technical scheme of the application relates to personal information, the product applying the technical scheme of the application clearly informs the personal information processing rule before processing the personal information, and obtains independent consent of the individual. If the technical scheme of the application relates to sensitive personal information, the product applying the technical scheme of the application obtains individual consent before processing the sensitive personal information, and simultaneously meets the requirement of 'explicit consent'. For example, a clear and remarkable mark is set at a personal information acquisition device such as a camera to inform that the personal information acquisition range is entered, personal information is acquired, and if the personal voluntarily enters the acquisition range, the personal information is considered as consent to be acquired; or on the device for processing the personal information, under the condition that obvious identification/information is utilized to inform the personal information processing rule, personal authorization is obtained by popup information or a person is requested to upload personal information and the like; the personal information processing rule may include information such as a personal information processor, a personal information processing purpose, a processing mode, and a type of personal information to be processed.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims

1. A high performance optical lens comprising 7 lenses of specific optical power, in order from an object side to an image side along an optical axis:

a first lens having positive optical power;

a second lens having positive optical power;

a third lens having negative optical power;

a diaphragm;

the lens group is formed by gluing a sixth lens and a seventh lens which are sequentially arranged from the object side to the image side, the sixth lens is a negative focal power lens, the seventh lens is a positive focal power lens, and the lens group is used for eliminating chromatic aberration; wherein the focal length ratio and the field angle function of the lens group and the high-performance optical lens satisfy the following relationship:

，/>

representing the focal length ratio of the lens group to the high performance optical lens, < >>

Representing a field angle of the high performance optical lens;

a fourth lens having positive optical power;

a fifth lens having negative optical power.

2. The high performance optical lens of claim 1 wherein,

3. The high performance optical lens of claim 2 wherein,

the structure of at least one of the first lens, the second lens, the third lens, the sixth lens and the seventh lens is as follows: the surface close to the object side is a convex surface, and the surface close to the image side is a concave surface.

4. The high performance optical lens of claim 1 wherein,

the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are spherical lenses, and the fourth lens is an aspherical lens;

and/or, the abbe number of the sixth lens is less than or equal to 21;

and/or, the abbe number of the seventh lens is less than or equal to 30.

5. The high performance optical lens of claim 1 wherein,

a ratio of a difference between a second central radius of curvature of an object side surface of the third lens and a first central radius of curvature of an image side surface of the second lens to a sum of the first central radius of curvature and the second central radius of curvature is less than or equal to 0.45;

and/or the refractive index of the second lens is less than or equal to 1.7;

And/or, the refractive index of the third lens is less than or equal to 1.8;

and/or the ratio between the focal length of the second lens and the focal length of the high-performance optical lens is less than or equal to 1.6;

and/or, the focal length of the first lens is less than or equal to 31.3;

and/or, the focal length of the fourth lens is less than or equal to 10.8;

and/or, the focal length of the fifth lens is less than or equal to-14.6.

6. The high performance optical lens of claim 1 wherein,

the high-performance optical lens further comprises an optical filter and an imaging surface which are sequentially arranged from the object side to the image side along the optical axis, and the optical filter is arranged on one surface of the fifth lens close to the image side;

and/or the diaphragm is an aperture diaphragm.

7. A high-precision laser radar is characterized in that,

the high-precision lidar comprising the high-performance optical lens of any of claims 1-6 and an image sensor.