CN116203700A

CN116203700A - Optical lens and electronic device

Info

Publication number: CN116203700A
Application number: CN202111450593.8A
Authority: CN
Inventors: 裘文伟; 王一峰; 王东方; 丁健; 别寻; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2023-06-02

Abstract

The application discloses an optical lens and electronic equipment comprising the same. The optical lens sequentially comprises from a first side to a second side along an optical axis: a first lens with negative focal power, wherein a first side surface of the first lens is a convex surface, and a second side surface of the first lens is a concave surface; a second lens with negative focal power, wherein the first side surface of the second lens is a concave surface; a third lens having positive optical power, the second side of which is convex; a fourth lens having positive optical power, the first side of which is convex; a fifth lens; a sixth lens; a seventh lens; and an eighth lens having positive optical power, the first side of which is convex.

Description

Optical lens and electronic device

Technical Field

The present disclosure relates to the field of optical elements, and more particularly, to an optical lens and an electronic device.

Background

The optical lens is used as a key component for acquiring external information of the automobile auxiliary driving system, and is widely applied to the automobile auxiliary driving system such as a vehicle-mounted reversing visual system, a vehicle recorder, an automatic parking and panoramic parking system, a road searching system and the like.

With the rapid development of automatic driving auxiliary systems, the performance requirements on the vehicle-mounted side-view optical lens are also higher and higher, and the development is towards high resolution, large field of view, small distortion and miniaturization. Meanwhile, as the requirements of the automatic driving auxiliary system on night driving are gradually increased, the requirements on night vision functions of the vehicle-mounted optical lens are also gradually increased.

Therefore, there is a need in the market for an optical lens with a large aperture, high relative illuminance and miniaturization, so as to meet the requirements of side-view application of the automobile.

Disclosure of Invention

In one aspect, an optical lens is provided. The optical lens includes: the optical axis comprises, in order from a first side to a second side: a first lens with negative focal power, wherein a first side surface of the first lens is a convex surface, and a second side surface of the first lens is a concave surface; a second lens with negative focal power, wherein the first side surface of the second lens is a concave surface; a third lens having positive optical power, the second side of which is convex; a fourth lens having positive optical power, the first side of which is convex; a fifth lens; a sixth lens; a seventh lens; and an eighth lens having positive optical power, the first side of which is convex.

In some embodiments, the first side of the third lens is convex or concave.

In some embodiments, the second side of the fourth lens is convex or concave.

In some embodiments, the fifth lens has positive optical power, the first side of which is convex, and the second side of which is convex; and the sixth lens has negative focal power, the first side surface of the sixth lens is concave, and the second side surface of the sixth lens is convex.

In some embodiments, the fifth lens has a negative optical power, the first side of which is convex, and the second side of which is concave; and the sixth lens has positive focal power, wherein the first side surface is a convex surface, and the second side surface is a convex surface.

In some embodiments, the seventh lens has a negative optical power, the first side of which is concave and the second side of which is convex.

In some embodiments, the seventh lens has positive optical power with a convex first side and a convex or concave second side.

In some embodiments, the second side of the eighth lens is convex or concave.

In some embodiments, the fifth lens and the sixth lens form a cemented lens.

In some embodiments, the effective focal length F8 of the eighth lens and the total effective focal length F of the optical lens satisfy: F8/F is more than or equal to 0.1.

In some embodiments, the radius of curvature R32 of the second side of the third lens and the radius of curvature R41 of the first side of the fourth lens satisfy: R32/R41 is less than or equal to-0.05.

In some embodiments, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: F4/F is more than or equal to 0.1.

In some embodiments, the radius of curvature R21 of the first side of the second lens and the total effective focal length F of the optical lens satisfy: R21/F is less than or equal to-0.1.

In some embodiments, the radius of curvature R51 of the first side of the fifth lens and the radius of curvature R62 of the second side of the sixth lens satisfy: R51/R62 is less than or equal to-0.05.

In some embodiments, the total length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: TTL/F is less than or equal to 12.

In some embodiments, the total length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle satisfy: TTL/H/FOV is less than or equal to 0.05.

In some embodiments, the total length TTL of the optical lens, the maximum field angle θ of the optical lens expressed in radians, and the image height H corresponding to the maximum field angle satisfy: TTL/H/θ is less than or equal to 2.6.

In some embodiments, the maximum field angle FOV of the optical lens, the maximum light passing aperture D of the first lens corresponding to the maximum field angle, and the image height H corresponding to the maximum field angle satisfy: the D/H/FOV is less than or equal to 0.025.

In some embodiments, the maximum field angle θ of the optical lens expressed in radian values, the maximum light passing aperture D of the first lens corresponding to the maximum field angle, and the image height H corresponding to the maximum field angle satisfy: D/H/θ is less than or equal to 1.5.

In some embodiments, the total effective focal length F of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle satisfy: (FOV×H)/F is not less than 150.

In some embodiments, the total effective focal length F of the optical lens, the maximum field angle θ of the optical lens expressed in radians, and the image height H corresponding to the maximum field angle satisfy: (θ×H)/F is not less than 3.

In some embodiments, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F/ENPD is less than or equal to 1.8.

In some embodiments, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: F1/F is less than or equal to-0.1.

In some embodiments, the radius of curvature R81 of the first side of the eighth lens and the total effective focal length F of the optical lens satisfy: R81/F is more than or equal to 1.5.

In some embodiments, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: F2/F is less than or equal to-0.1.

In some embodiments, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: F3/F is more than or equal to 0.2.

In some embodiments, the effective focal length F2 of the second lens and the effective focal length F3 of the third lens satisfy: F2/F3 is less than or equal to-5 and less than or equal to-0.02.

In some embodiments, the total effective focal length F of the optical lens, the maximum field angle θ of the optical lens expressed in radians, and the image height H corresponding to the maximum field angle satisfy: and the I (H-Fxθ)/(Fxθ) I is less than or equal to 1.5.

In some embodiments, the radius of curvature R11 of the first side of the first lens and the total effective focal length F of the optical lens satisfy: R11/F is less than or equal to 1.5 and less than or equal to 50.

Another aspect of the present application also provides an optical lens. The optical lens includes: the optical axis comprises, in order from a first side to a second side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein the first lens and the second lens have negative optical power; the third lens, the fourth lens and the eighth lens have positive focal power; the maximum field angle FOV of the optical lens, the maximum light passing aperture D of the first lens corresponding to the maximum field angle, and the image height H corresponding to the maximum field angle satisfy: the D/H/FOV is less than or equal to 0.025.

In some embodiments, the first side of the first lens is convex and the second side is concave.

In some embodiments, the first side of the second lens is concave and the second side is concave;

in some embodiments, the first side of the third lens is convex or concave and the second side is convex.

In some embodiments, the first side of the fourth lens is convex and the second side is convex or concave.

In some embodiments, the first side of the eighth lens is convex and the second side is convex or concave.

In some embodiments, the fifth lens and the sixth lens form a cemented lens.

In some embodiments, the total length TTL of the optical lens satisfies: TTL/H/FOV is less than or equal to 0.05.

In some embodiments, the maximum field angle θ of the optical lens expressed in radians satisfies: TTL/H/θ is less than or equal to 2.6.

In some embodiments, the maximum field angle θ of the optical lens expressed in radians satisfies: D/H/θ is less than or equal to 1.5.

In some embodiments, the total effective focal length F of the optical lens satisfies: (FOV×H)/F is not less than 150.

In some embodiments, the total effective focal length F of the optical lens, the maximum field angle θ of the optical lens in radians, satisfies: (θ×H)/F is not less than 3.

In some embodiments, the total effective focal length F of the optical lens, the maximum field angle θ of the optical lens in radians, satisfies: and the I (H-Fxθ)/(Fxθ) I is less than or equal to 1.5.

Another aspect of the present application also provides an electronic device including an optical lens provided according to the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

The eight lenses are adopted, and the shape, the focal power and the like of each lens are optimally arranged, so that the optical lens has at least one beneficial effect of high resolution, small caliber, miniaturization, large aperture, high relative illuminance, small distortion, large field angle and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic diagram showing the structure of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic diagram showing the structure of an optical lens according to embodiment 2 of the present application;

fig. 3 is a schematic diagram showing the structure of an optical lens according to embodiment 3 of the present application;

fig. 4 is a schematic diagram showing the structure of an optical lens according to embodiment 4 of the present application;

fig. 5 is a schematic view showing the structure of an optical lens according to embodiment 5 of the present application;

fig. 6 is a schematic diagram showing the structure of an optical lens according to embodiment 6 of the present application;

fig. 7 is a schematic view showing the structure of an optical lens according to embodiment 7 of the present application;

fig. 8 is a schematic diagram showing the structure of an optical lens according to embodiment 8 of the present application;

fig. 9 is a schematic diagram showing the structure of an optical lens according to embodiment 9 of the present application; and

Fig. 10 is a schematic diagram showing the structure of an optical lens according to embodiment 10 of the present application.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is referred to as the first side of the lens, the surface of each lens closest to the second side is referred to as the second side of the lens, and the surface of the optical lens closest to the second side is referred to as the second side of the optical lens. Illustratively, the first side may be an object side and the second side may be an image side; alternatively, the first side may be the imaging side and the second side may be the image source side.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The features, principles, and other aspects of the present application are described in detail below.

In an exemplary embodiment, the optical lens includes, for example, eight lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The eight lenses are arranged in sequence along the optical axis from the first side to the second side.

In an exemplary embodiment, the optical lens provided herein may be used as, for example, a vehicle-mounted side view lens. At this time, the first side of the optical lens may be an object side, and the second side may be an image side. The light from the object side may be imaged at the image side, and the second side of the optical lens may be an imaging surface of the optical lens.

In an exemplary embodiment, the optical lens provided herein may be used as, for example, a projection lens or a lidar transmitting end lens. At this time, the second side of the optical lens may be an image source side, and the first side may be an image forming side. Light from the image source side can be imaged on the imaging side. The second side of the optical lens may be an image source surface of the optical lens.

In an exemplary embodiment, the optical lens may further include a photosensitive element disposed at the second side. Alternatively, the photosensitive element disposed on the second side may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

In an exemplary embodiment, the first lens may have negative optical power, and may have a convex-concave shape. The first lens has negative focal power, has a divergent effect on light rays passing through the first lens, and can keep rising trend of the light rays exiting through the first lens. Under the same angle of view, the light rays emitted through the second side surface of the first lens can enable the rear optical system to have a larger light ray receiving surface. The first side surface of the first lens is convex, so that light can reach the rear optical system through the first lens at a smaller incident angle on the first side surface of the first lens, and the large angle of view is facilitated. Meanwhile, under the condition of the same field angle, the corresponding image height can be increased, so that the light rays with larger angles can be received, and the distortion is reduced. In addition, in practical application, the first side of the first lens is a convex surface, so that the sliding of water drops is facilitated, and the influence on imaging is reduced.

In an exemplary embodiment, the second lens may have negative optical power, and may have a biconcave shape. The second lens has negative focal power, can collect the light that passes through first lens, is favorable to mild place ahead light trend, is favorable to promoting resolution. Meanwhile, the second lens with negative focal power has a divergent effect on light rays, and under the condition of the same field angle, the light rays emitted from the second side face of the second lens can enable the rear optical system to have a larger light ray receiving surface, so that on one hand, the expansion of an image surface is facilitated, on the other hand, the physical aperture of a diaphragm can be enlarged, the aperture can be enlarged, further, larger light inlet quantity can be realized, and the brightness of the image surface can be increased. The first side of the second lens is a concave surface, and can be matched with the first lens with the concave surface on the second side so as to change the trend of marginal rays, thereby being beneficial to realizing a large view field, reducing the caliber of the front end of the optical lens, reducing the volume and realizing miniaturization and cost reduction. In addition, the concave surface on the first side of the second lens can also make the light ray have obvious turning after entering the second lens, thereby being beneficial to changing the trend of the light ray with large angle.

In an exemplary embodiment, the third lens may have positive optical power, and the third lens may have a biconvex type or a concavo-convex type. The third lens has positive focal power, so that light can be smoothly transited to the rear lens, and the resolution capability is improved. The second side of the third lens is convex, and meanwhile, the fourth lens with the convex first side is matched to collect light, so that the light scattered in front can smoothly enter the rear optical system, and the position of the light incident into the rear optical system can be depressed, thereby being beneficial to reducing the caliber of the rear end of the optical lens. In addition, the shape of the second side of the third lens and the shape of the first side of the fourth lens may have a significant difference, so that the profile of the light ray may be significantly changed. Meanwhile, under the condition that the caliber of the first side face of the third lens is the same, the front end caliber of the optical lens can be reduced, and the purpose of miniaturization of the optical lens is achieved.

In an exemplary embodiment, the fourth lens may have positive optical power, and the fourth lens may have a biconvex type or a convex-concave type. The fourth lens has positive focal power, can further converge light rays, can enable the light rays to be smoothly transited to a rear optical system after passing through the third lens and the fourth lens, improves the resolution capability, and can further reduce the rear end caliber of the optical lens due to the convergence of the fourth lens on the light rays. In addition, when the second side of the third lens is convex and the first side of the fourth lens is convex, the optical beam profile of the fourth lens can be obviously changed. Under the condition that the caliber of the fourth lens is the same, the front end caliber of the optical lens can be reduced, and the purpose of miniaturization of the optical lens is achieved. When the fourth lens is in a meniscus shape with a convex-concave surface, the light entering through the third lens can be collected, and meanwhile, the positive focal power is favorable for converging the light, so that the light trend is smoothly transited into a rear optical system, and the resolution capability is improved.

In an exemplary embodiment, the fifth lens may have negative optical power, and may have a convex-concave shape. Because the front of the fifth lens comprises at least two lenses with positive focal power, larger aberration can be possibly brought while the trend of light rays is changed, the fifth lens has negative focal power, the light rays have a divergent effect, and various aberrations brought by the front positive focal power lens can be effectively corrected by controlling the focal length of the fifth lens, so that the imaging quality is improved. In addition, the first side surface of the fifth lens is convex, which can further play a role of converging light, so that the light smoothly transits to the rear lens after passing through the third lens and the fourth lens. Meanwhile, when the focal power of the cemented lens formed by the fifth lens and the sixth lens is positive, the converging action on the light is favorable for further reducing the rear end caliber of the optical lens.

In an exemplary embodiment, the fifth lens may have positive optical power, and may have a biconvex type. The fifth lens has positive focal power, plays a role in converging light rays, and can further reduce aberration and improve imaging quality by reasonably setting the focal power of the fifth lens. Meanwhile, the light rays can be effectively and stably converged, and the light rays can reach an image plane stably. In addition, the first side surface of the fifth lens is convex, which can further play a role of converging light, so that the light smoothly transits to the rear lens after passing through the third lens and the fourth lens. Meanwhile, when the focal power of the cemented lens formed by the fifth lens and the sixth lens is positive, the converging action on the light is favorable for further reducing the rear end caliber of the optical lens.

In an exemplary embodiment, the sixth lens may have negative optical power, and may have a concave-convex type. Because the front of the sixth lens comprises at least two lenses with positive focal power, larger aberration can be possibly brought while the trend of light rays is changed, the sixth lens has negative focal power, the light rays have a divergent effect, and various aberrations brought by the front positive focal power lens can be effectively corrected by controlling the focal length of the sixth lens, so that the imaging quality is improved. In addition, the second side surface of the sixth lens is a convex surface, which can further play a role of converging light, so that the light smoothly transits to the rear lens after passing through the third lens and the fourth lens. Meanwhile, when the focal power of the cemented lens formed by the fifth lens and the sixth lens is positive, the converging action on the light is favorable for further reducing the rear end caliber of the optical lens.

In an exemplary embodiment, the sixth lens may have positive optical power, and may have a biconvex type. The sixth lens has positive focal power, plays a role in converging light rays, and can further reduce aberration and improve imaging quality by reasonably setting the focal power of the sixth lens. Meanwhile, the light rays can be effectively and stably converged, and the light rays can reach an image plane stably. In addition, the second side surface of the sixth lens is a convex surface, which can further play a role of converging light, so that the light smoothly transits to the rear lens after passing through the third lens and the fourth lens. Meanwhile, when the focal power of the cemented lens formed by the fifth lens and the sixth lens is positive, the converging action on the light is favorable for further reducing the rear end caliber of the optical lens.

In an exemplary embodiment, the seventh lens may have negative optical power, and may have a concave-convex type. The focal power and the surface shape of the seventh lens can lead the front light to diverge, thereby being beneficial to increasing the back focus and being beneficial to the assembly of the module.

In an exemplary embodiment, the seventh lens may have positive power, and may have a convex-concave type or a biconvex type. The seventh lens has positive focal power, is favorable for light convergence, ensures that the light trend is gentle, reduces the sensitivity, can reduce the caliber and the length of the optical lens, and is favorable for realizing miniaturization.

In an exemplary embodiment, the eighth lens may have positive power, and may have a convex-concave type or a biconvex type. When the eighth lens has positive focal power and has a biconvex shape with gentle lens shape, divergent light can smoothly enter the rear optical system to play a role of converging light, thereby being beneficial to reducing the marginal view field CRA and improving the relative illuminance. In addition, when the radius of curvature of the first side surface of the eighth lens is large, smooth transition of light is facilitated, and the sensitivity of the optical lens is reduced.

In an exemplary embodiment, a stop for converging light may be disposed between the fourth lens and the fifth lens to further improve the imaging quality of the optical lens. The diaphragm is arranged between the fourth lens and the fifth lens, so that light rays entering the optical lens can be effectively converged, the caliber of the rear end lens of the optical lens is reduced, and the assembly sensitivity of the optical lens is reduced.

In an exemplary embodiment, the fifth lens and the sixth lens may form a lens glue. By adopting the arrangement mode, the light rays passing through the fourth lens can be smoothly transited to the imaging surface, the total length of the optical lens is reduced, and various aberrations of the optical lens can be sufficiently corrected. On the premise of realizing compact structure, the resolution can be improved, and the optical performances such as distortion, CRA and the like are optimized. In addition, the cemented lens formed by the fifth lens and the sixth lens has the following advantages: the air space between the fifth lens and the sixth lens can be reduced, thereby reducing the total length of the optical lens; the assembly parts between the fifth lens and the sixth lens can be reduced, the working procedures are reduced, and the cost is reduced; the tolerance sensitivity problems of inclination, core deviation and the like generated in the assembling process of each lens can be reduced; the light quantity loss caused by reflection among the lenses can be reduced, and the illumination is improved; the curvature of field can be further reduced, which is beneficial to correcting off-axis aberrations of the optical lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F8/F is more than or equal to 0.1. Wherein F8 is the effective focal length of the eighth lens, and F is the total effective focal length of the optical lens. The optical lens satisfies that F8/F is more than or equal to 0.1, can realize converging light rays, is favorable for reducing an edge view field CRA and improves relative illuminance. More specifically, F8 and F further satisfy: F8/F is more than or equal to 0.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R32/R41 is less than or equal to-0.05. Where R32 is the radius of curvature of the second side of the third lens and R41 is the radius of curvature of the first side of the fourth lens. The optical lens satisfies R32/R41 less than or equal to-0.05, the shape of the second side surface of the third lens and the shape of the first side surface of the fourth lens can be obviously different, the optical lens is favorable for obviously changing the light trend, the light scattered after passing through the first lens and the second lens is further converged, the rear end diameter of the optical lens can be further reduced, and the miniaturization of the optical lens is favorable. More specifically, R32 and R41 may further satisfy: R32/R41 is less than or equal to-0.1.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F4/F is more than or equal to 0.1. Wherein F4 is the effective focal length of the fourth lens, and F is the total effective focal length of the optical lens. The optical lens satisfies that F4/F is more than or equal to 0.1, the fourth lens can further play a role in converging light, the light is smoothly transited to the rear lens after passing through the third lens and the fourth lens, the resolving power is improved, meanwhile, the converging effect of the fourth lens on the light can further reduce the rear port diameter of the optical lens, and the miniaturization is facilitated. More specifically, F4 and F further satisfy: F4/F is more than or equal to 0.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R21/F is less than or equal to-0.1. Where R21 is the radius of curvature of the first side of the second lens and F is the total effective focal length of the optical lens. The optical lens meets R21/F less than or equal to-0.1, is beneficial to controlling the shape of the first side surface of the second lens, is matched with the second side surface of the first lens, can change the trend of marginal rays, and is beneficial to realizing a large view field. In addition, the front end caliber of the optical lens is reduced, the volume is reduced, and the miniaturization is realized. More specifically, R21 and F may further satisfy: R21/F is less than or equal to-1.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R51/R62 is less than or equal to-0.05, wherein R51 is the radius of curvature of the first side surface of the fifth lens, and R62 is the radius of curvature of the second side surface of the sixth lens. The optical lens satisfies R51/R62 less than or equal to-0.05, the first side surface of the fifth lens and the second side surface of the sixth lens can be set to be in a special lens shape, the effect of converging light rays can be further achieved, and the light rays can be smoothly transited to the rear lens after passing through the third lens and the fourth lens. Meanwhile, when the cemented lens formed by the fifth lens and the sixth lens has positive optical power, the converging action of the light rays can further reduce the rear end caliber of the optical lens. More specifically, R51 and R61 may further satisfy: R51/R62 is less than or equal to-0.1.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 12. Where TTL is the total length of the optical lens and F is the total effective focal length of the optical lens. The optical lens satisfies TTL/F not more than 12, can effectively limit the length of the optical lens, and is beneficial to realizing miniaturization of the optical lens. More specifically, TTL and F can further satisfy: TTL/F is less than or equal to 10. The total length TTL of the optical lens may be a distance on the optical axis from the center of the first side of the first lens to the imaging plane.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/FOV is less than or equal to 0.05. Wherein TTL is the total length of the optical lens, FOV is the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. The optical lens satisfies TTL/H/FOV less than or equal to 0.05, and can effectively limit the length of the optical lens under the condition of the same image height of the same imaging surface, thereby being beneficial to realizing miniaturization of the lens. More specifically, TTL, FOV, and H further satisfy: TTL/H/FOV is less than or equal to 0.045.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/θ is less than or equal to 2.6. Wherein TTL is the total length of the optical lens, θ is the maximum field angle of the optical lens expressed by radian value, and H is the image height corresponding to the maximum field angle of the optical lens. The optical lens satisfies TTL/H/theta less than or equal to 2.6, and can effectively limit the length of the optical lens under the condition of the same image height of the same imaging surface, thereby being beneficial to realizing miniaturization of the lens. More specifically, TTL, θ, and H further satisfy: TTL/H/θ is less than or equal to 2.4.

In an exemplary embodiment, an optical lens according to the present application may satisfy: the D/H/FOV is less than or equal to 0.025. Wherein, FOV is the maximum angle of view of the optical lens, D is the maximum aperture of the first lens corresponding to the maximum angle of view of the optical lens, and H is the image height corresponding to the maximum angle of view of the optical lens. The optical lens satisfies D/H/FOV less than or equal to 0.025, which is beneficial to reducing the front end caliber of the optical lens and realizing the miniaturization of the optical lens. More specifically, FOV, D, and H may further satisfy: D/H/FOV is less than or equal to 0.02.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/θ is less than or equal to 1.5. Where θ is the maximum angle of view of the optical lens expressed in radian, D is the maximum aperture of the first lens corresponding to the maximum angle of view of the optical lens, and H is the image height corresponding to the maximum angle of view of the optical lens. The optical lens satisfies D/H/theta less than or equal to 1.5, is beneficial to reducing the front end caliber of the optical lens, and realizes miniaturization of the optical lens. More specifically, θ, D, and H may further satisfy: D/H/θ is less than or equal to 1.2.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV×H)/F is not less than 150. Where F is the total effective focal length of the optical lens, FOV is the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. The optical lens satisfies (FOV multiplied by H)/F is more than or equal to 150, and is beneficial to the optical lens to have a large field angle. In addition, under the condition of the same imaging surface, the focal length of the optical lens can be smaller, so that the optical lens is beneficial to receiving light rays with larger angles and reducing distortion. More specifically, F, FOV and H may further satisfy: (FOV×H)/F is not less than 180.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (θ×H)/F is not less than 3. Where F is the total effective focal length of the optical lens, θ is the maximum field angle of the optical lens expressed in radian, and H is the image height corresponding to the maximum field angle of the optical lens. The optical lens satisfies (theta x H)/F not less than 3, and is beneficial to the optical lens to have a large field angle. In addition, under the condition of the same imaging surface, the focal length of the optical lens can be smaller, so that the optical lens is beneficial to receiving light rays with larger angles and reducing distortion. More specifically, F, θ, and H may further satisfy: (θ×H)/F is not less than 3.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F/ENPD is less than or equal to 1.8. Where F is the total effective focal length of the optical lens and ENPD is the entrance pupil diameter of the optical lens. The optical lens satisfies F/ENPD less than or equal to 1.8, can make the optical lens have the characteristic of large aperture, is favorable to increasing the light quantity. More specifically, F and ENPD may further satisfy: F/ENPD is less than or equal to 1.6.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F1/F is less than or equal to-0.1. Where F1 is the effective focal length of the first lens and F is the total effective focal length of the optical lens. The optical lens meets F1/F less than or equal to-0.1, the focal power of the first lens can be optimized, and light rays with a large angle of view can enter the optical lens. More specifically, F1 and F further satisfy: F1/F is less than or equal to-0.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R81/F is more than or equal to 1.5. Where R81 is the radius of curvature of the first side of the eighth lens and F is the total effective focal length of the optical lens. The optical lens meets the requirement that R81/F is more than or equal to 1.5, and the first side surface of the eighth lens has a larger curvature radius, so that smooth transition of light is facilitated, and the sensitivity of the optical lens is reduced. More specifically, R81 and F may further satisfy: R81/F is more than or equal to 2.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F2/F is less than or equal to-0.1. Where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens. The optical lens satisfies F2/F less than or equal to-0.1, can collect light entering through the first lens, is favorable for smoothing the trend of front light, and is favorable for improving the resolution. Meanwhile, the light can be diverged, and under the condition of the same field angle, the light emitted from the second side surface of the first lens can enable the rear optical system to have a larger light receiving surface, so that on one hand, the expansion of an image surface is facilitated, on the other hand, the physical aperture of the diaphragm can be enlarged, the aperture can be enlarged, the larger light inlet amount can be realized, and the brightness of the image surface can be increased. More specifically, F2 and F further satisfy: F2/F is less than or equal to-0.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F3/F is more than or equal to 0.2. Wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens. The optical lens meets the requirement that F3/F is more than or equal to 0.2, is beneficial to reducing the back end diameter of the optical lens, and realizes the miniaturization of the optical lens. More specifically, F3 and F further satisfy: F3/F is more than or equal to 0.8.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F2/F3 is less than or equal to-5 and less than or equal to-0.02. Wherein F2 is the effective focal length of the second lens and F3 is the effective focal length of the third lens. The optical lens satisfies that F2/F3 is less than or equal to-5 and less than or equal to-0.02, and can enable the focal lengths of the second lens and the third lens to be similar, thereby being beneficial to smoothly passing light rays and improving imaging quality. More specifically, F2 and F3 may further satisfy: F2/F3 is less than or equal to-1 and less than or equal to-0.1.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and the I (H-Fxθ)/(Fxθ) I is less than or equal to 1.5. Where F is the total effective focal length of the optical lens, θ is the maximum field angle of the optical lens expressed in radian, and H is the image height corresponding to the maximum field angle of the optical lens. The optical lens satisfies the condition that the (H-Fxθ)/(Fxθ) is less than or equal to 1.5, and the effect of reducing the difference between the actual image height and the ideal image height can be achieved by reasonably designing the focal length and the view angle, so that the distortion is reduced. More specifically, F, θ, and H may further satisfy: and the (H-Fxθ)/(Fxθ) is less than or equal to 0.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R11/F is less than or equal to 1.5 and less than or equal to 50. Where R11 is the radius of curvature of the first side of the first lens and F is the total effective focal length of the optical lens. The optical lens satisfies R11/F less than or equal to 1.5 and less than or equal to 50, and can control the curvature radius of the first side surface of the first lens, so that on one hand, the first lens is far away from an image surface, the corresponding image height under the same view field becomes larger, the light rays with larger angles can be received, and the distortion is reduced. On the other hand, the light passing through the first lens does not generate abrupt turning, which is beneficial to reducing tolerance sensitivity. More specifically, R11 and F may further satisfy: R11/F is more than or equal to 2 and less than or equal to 20.

In an exemplary embodiment, the first to eighth lenses may be spherical lenses or aspherical lenses. The present application is not particularly limited to the specific number of spherical lenses and aspherical lenses, and the number of aspherical lenses may be increased when focusing on the imaging quality. The aspherical lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, aberration generated during imaging can be eliminated as much as possible, and therefore imaging quality of the lens is improved.

In an exemplary embodiment, the optical lens of the present application may further include a filter and/or a cover glass disposed between the eighth lens and the imaging surface as needed to filter light rays having different wavelengths and prevent an image Fang Yuanjian (e.g., a chip) of the optical lens from being damaged.

In an exemplary embodiment, 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 may be glass lenses. The adoption of the glass material can avoid the influence on the normal use of the lens due to the imaging blurring of the lens caused by the high and low temperature change in the use environment. Specifically, when the image quality and reliability are emphasized, the first lens to the eighth lens may be glass aspherical lenses. Of course, in applications with low requirements for temperature stability, the first lens to the eighth lens in the optical lens may be made of plastic. The optical lens is made of plastic, so that the manufacturing cost can be effectively reduced. Of course, the first lens to the eighth lens in the optical lens may also be made of plastic and glass in combination.

According to the optical lens of the embodiment of the application, through reasonable arrangement of the shape and the focal power of each lens, the optical lens has at least one beneficial effect of high resolution, small caliber, miniaturization, large aperture, high relative illumination, small distortion and large field angle under the condition that only eight lenses are used.

However, those skilled in the art will appreciate that the number of lenses making up a lens barrel may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, although eight lenses are described as an example in the embodiment, the optical lens is not limited to include eight lenses. The optical lens may also include other numbers of lenses, if desired.

Specific examples of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

Example 1

An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic configuration of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

The first lens L1 is a meniscus lens having negative optical power, the first side S1 is a convex surface, and the second side S2 is a concave surface. The second lens L2 is a biconcave lens having negative optical power, the first side surface S3 thereof is a concave surface, and the second side surface S4 thereof is a concave surface. The third lens L3 is a biconvex lens having positive optical power, and has a convex first side S5 and a convex second side S6. The fourth lens L4 is a biconvex lens having positive optical power, and has a convex first side S7 and a convex second side S8. The fifth lens L5 is a biconvex lens having positive optical power, and has a convex first side S10 and a convex second side S11. The sixth lens L6 is a meniscus lens with negative power, the first side S11 thereof is a concave surface, the second side S12 thereof is a convex surface, the seventh lens L7 is a meniscus lens with negative power, the first side S13 thereof is a concave surface, the second side S14 thereof is a convex surface, the eighth lens L8 is a biconvex lens with positive power, the first side S15 thereof is a convex surface, and the second side S16 thereof is a convex surface.

The optical lens may further include a stop STO, which may be disposed between the fourth lens L4 and the fifth lens L5. For example, the stop STO may be disposed near the second side S8 of the fourth lens L4.

Illustratively, the optical lens may further include auxiliary lenses L9 and L10 having no optical power, the auxiliary lens L9 may have a first side S17 and a second side S18, and the auxiliary lens L10 may have a first side S19 and a second side S20. Alternatively, the auxiliary lenses L9 and L10 may be filters or cover glasses. The filter may be used to correct color deviations. The cover glass may be used to protect the image sensing chip IMA located at the imaging surface S21.

The optical lens provided by the application can be used as a vehicle-mounted side view lens, for example. At this time, light from the object sequentially passes through the respective surfaces S1 to S20 and is finally imaged on the imaging surface S21 provided on the second side, wherein the imaging surface S21 is provided with the image sensing chip IMA.

Table 1 shows the radius of curvature R, thickness/distance d (it is understood that the thickness d in the line of S1 is the center thickness d1 of the first lens L1, and the thickness d in the line of S2 is the distance d2 between the second side surface of the first lens L1 and the first side surface of the second lens L2 on the optical axis, and so on), the refractive index Nd, and the abbe number Vd of each lens of the optical lens of embodiment 1.

TABLE 1

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. Fig. 2 shows a schematic structural view of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

Table 2 shows the radius of curvature R, thickness/distance d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2.

TABLE 2

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 shows a schematic structural view of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

The first lens L1 is a meniscus lens having negative optical power, the first side S1 is a convex surface, and the second side S2 is a concave surface. The second lens L2 is a biconcave lens having negative optical power, the first side surface S3 thereof is a concave surface, and the second side surface S4 thereof is a concave surface. The third lens L3 is a biconvex lens having positive optical power, and has a convex first side S5 and a convex second side S6. The fourth lens L4 is a biconvex lens having positive optical power, and has a convex first side S7 and a convex second side S8. The fifth lens L5 is a meniscus lens with negative power, and the first side S10 and the second side S11 thereof are convex and concave, respectively. The sixth lens L6 is a biconvex lens having positive optical power, the first side S11 thereof is a convex surface, the second side S12 thereof is a convex surface, the seventh lens L7 is a meniscus lens having negative optical power, the first side S13 thereof is a concave surface, the second side S14 thereof is a convex surface, the eighth lens L8 is a biconvex lens having positive optical power, the first side S15 thereof is a convex surface, and the second side S16 thereof is a convex surface.

Table 3 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3.

TABLE 5

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural view of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

Table 4 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4.

TABLE 4 Table 4

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 shows a schematic structural view of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

The first lens L1 is a meniscus lens having negative optical power, the first side S1 is a convex surface, and the second side S2 is a concave surface. The second lens L2 is a biconcave lens having negative optical power, the first side surface S3 thereof is a concave surface, and the second side surface S4 thereof is a concave surface. The third lens L3 is a meniscus lens with positive power, the first side S5 is concave, and the second side S6 is convex. The fourth lens L4 is a biconvex lens having positive optical power, and has a convex first side S7 and a convex second side S8. The fifth lens L5 is a biconvex lens having positive optical power, and has a convex first side S10 and a convex second side S11. The sixth lens L6 is a meniscus lens with negative focal power, the first side S11 thereof is a concave surface, the second side S12 thereof is a convex surface, the seventh lens L7 is a biconvex lens with positive focal power, the first side S13 thereof is a convex surface, the second side S14 thereof is a convex surface, the eighth lens L8 is a meniscus lens with positive focal power, the first side S15 thereof is a convex surface, and the second side S16 thereof is a concave surface.

The optical lens may further include a stop STO, which may be disposed between the fourth lens L4 and the fifth lens L5.

Table 5 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5.

TABLE 5

Example 6

An optical lens according to embodiment 6 of the present application is described below with reference to fig. 6. Fig. 6 shows a schematic structural view of an optical lens according to embodiment 6 of the present application.

As shown in fig. 6, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

Table 6 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 6.

TABLE 6

Example 7

An optical lens according to embodiment 7 of the present application is described below with reference to fig. 7. Fig. 7 shows a schematic structural view of an optical lens according to embodiment 7 of the present application.

As shown in fig. 7, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

The first lens L1 is a meniscus lens having negative optical power, the first side S1 is a convex surface, and the second side S2 is a concave surface. The second lens L2 is a biconcave lens having negative optical power, the first side surface S3 thereof is a concave surface, and the second side surface S4 thereof is a concave surface. The third lens L3 is a meniscus lens with positive power, the first side S5 is concave, and the second side S6 is convex. The fourth lens L4 is a meniscus lens with positive optical power, and the first side S7 is a convex surface and the second side S8 is a concave surface. The fifth lens L5 is a biconvex lens having positive optical power, and has a convex first side S10 and a convex second side S11. The sixth lens L6 is a meniscus lens with negative focal power, the first side S11 thereof is a concave surface, the second side S12 thereof is a convex surface, the seventh lens L7 is a biconvex lens with positive focal power, the first side S13 thereof is a convex surface, the second side S14 thereof is a convex surface, the eighth lens L8 is a meniscus lens with positive focal power, the first side S15 thereof is a convex surface, and the second side S16 thereof is a concave surface.

Table 7 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 7.

TABLE 7

Example 8

An optical lens according to embodiment 8 of the present application is described below with reference to fig. 8. Fig. 8 shows a schematic structural view of an optical lens according to embodiment 8 of the present application.

As shown in fig. 8, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

Table 8 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 8.

Example 9

An optical lens according to embodiment 9 of the present application is described below with reference to fig. 9. Fig. 9 shows a schematic structural view of an optical lens according to embodiment 9 of the present application.

As shown in fig. 9, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

The first lens L1 is a meniscus lens having negative optical power, the first side S1 is a convex surface, and the second side S2 is a concave surface. The second lens L2 is a biconcave lens having negative optical power, the first side surface S3 thereof is a concave surface, and the second side surface S4 thereof is a concave surface. The third lens L3 is a meniscus lens with positive power, the first side S5 is concave, and the second side S6 is convex. The fourth lens L4 is a biconvex lens having positive optical power, and has a convex first side S7 and a convex second side S8. The fifth lens L5 is a biconvex lens having positive optical power, and has a convex first side S10 and a convex second side S11. The sixth lens L6 is a meniscus lens with negative focal power, the first side S11 thereof is a concave surface, the second side S12 thereof is a convex surface, the seventh lens L7 is a meniscus lens with positive focal power, the first side S13 thereof is a convex surface, the second side S14 thereof is a concave surface, the eighth lens L8 is a meniscus lens with positive focal power, the first side S15 thereof is a convex surface, and the second side S16 thereof is a concave surface.

Table 9 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 9.

TABLE 9

Example 10

An optical lens according to embodiment 10 of the present application is described below with reference to fig. 10. Fig. 10 shows a schematic structural diagram of an optical lens according to embodiment 10 of the present application.

As shown in fig. 10, the optical lens includes, in order from a first side to a second side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8.

Table 10 shows the radius of curvature R, thickness/interval d, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 10.

Table 10

In summary, examples 1 to 10 each satisfy the relationships shown in table 11 below. In table 11, TTL, H, D, F, F, F2, F3, F4, F5, F6, F7, F8, and ENPD are in millimeters (mm), and FOV is in degrees (°).

TABLE 11

The application also provides an electronic device, which can comprise the optical lens and the imaging element for converting an optical image formed by the optical lens into an electric signal. The electronic device may be a stand-alone electronic device such as a detection range camera or may be an imaging module integrated with such a detection range device. The electronic device may also be a stand-alone imaging device, such as an onboard camera, or an imaging module integrated on, for example, a driving assistance system.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. The optical lens is characterized by comprising, in order from a first side to a second side along an optical axis:

a first lens with negative focal power, wherein a first side surface of the first lens is a convex surface, and a second side surface of the first lens is a concave surface;

a second lens with negative focal power, wherein the first side surface of the second lens is a concave surface;

a third lens having positive optical power, the second side of which is convex;

a fourth lens having positive optical power, the first side of which is convex;

a fifth lens;

a sixth lens;

a seventh lens; and

an eighth lens with positive focal power has a convex first side.

2. The optical lens of claim 1, wherein the first side of the third lens is convex or concave.

3. The optical lens of claim 1, wherein the second side of the fourth lens is convex or concave.

4. The optical lens of claim 1, wherein,

the fifth lens has positive focal power, the first side surface of the fifth lens is a convex surface, and the second side surface of the fifth lens is a convex surface; and

the sixth lens has negative focal power, the first side surface of the sixth lens is concave, and the second side surface of the sixth lens is convex.

5. The optical lens of claim 1, wherein,

the fifth lens has negative focal power, the first side surface of the fifth lens is a convex surface, and the second side surface of the fifth lens is a concave surface; and

the sixth lens has positive focal power, the first side surface of the sixth lens is a convex surface, and the second side surface of the sixth lens is a convex surface.

6. The optical lens of claim 1, wherein,

the seventh lens has negative focal power, the first side surface is concave, and the second side surface is convex.

7. The optical lens of claim 1, wherein,

the seventh lens has positive focal power, the first side surface of the seventh lens is a convex surface, and the second side surface of the seventh lens is a convex surface or a concave surface.

8. The optical lens of claim 1, wherein the second side of the eighth lens is convex or concave.

9. The optical lens of claim 1, wherein the fifth lens and the sixth lens form a cemented lens.

10. The optical lens is characterized by comprising, in order from a first side to a second side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein,

the first lens and the second lens have negative optical power;

the third lens, the fourth lens, and the eighth lens have positive optical power;

the maximum field angle FOV of the optical lens, the maximum light passing aperture D of the first lens corresponding to the maximum field angle, and the image height H corresponding to the maximum field angle satisfy: the D/H/FOV is less than or equal to 0.025.