CN115248492A

CN115248492A - Optical lens and electronic device

Info

Publication number: CN115248492A
Application number: CN202110464714.8A
Authority: CN
Inventors: 姚波; 李响; 李禹衡
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2022-10-28

Abstract

The application discloses an optical lens and an electronic device comprising the same. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens element having a negative refractive power, the object-side surface of which is convex and the image-side surface of which is concave; a second lens having a positive refractive power, the object-side surface of which is convex; and a third lens having positive refractive power, the object-side surface 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 apparatus.

Background

With the continuous development of optical lens technology, the application of optical lenses is more and more extensive, for example, optical lenses play an irreplaceable role in multiple fields such as smart phones, security monitoring, automobile auxiliary driving, intelligent detection and virtual reality. Meanwhile, lens manufacturers in various large fields are also actively invested in and dedicated to research and development of and improve the performance and technology of optical lenses in order to improve the quality and competitiveness of their own products.

In recent years, automobile driving assistance systems have been developed at a high speed, and vehicle-mounted optical lenses are used as important tools for acquiring external information in the automobile driving assistance systems, so that the application of the vehicle-mounted optical lenses to automobiles is more and more extensive, and the requirements of users on the technology and the performance of the vehicle-mounted optical lenses are also more and more high. At present, people demand that vehicle-mounted lenses have higher imaging performance, and meanwhile, the requirement for miniaturization of the vehicle-mounted lenses is more and more prominent. However, most lens manufacturers generally increase the number of lenses to improve the imaging quality of the lens, but the lens structure with a large number of lenses increases the volume and weight of the lens, which affects the miniaturization of the lens.

In addition, the vehicle-mounted lens further needs to have higher stability to adapt to various severe environments, for example, the actual application environment of the vehicle-mounted lens may have a larger temperature difference, and most vehicle-mounted lenses in the current market cannot well ensure that clear imaging can be performed in high and low temperature environments, and usually shift of an image plane is generated, so that imaging of the lens is blurred, and normal use is affected. Therefore, high resolution, miniaturization, and high stability are the current trends in the development of on-vehicle lenses.

Disclosure of Invention

The present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens having a positive refractive power, the object-side surface of which is convex; and a third lens having a positive refractive power, the object-side surface of which is convex.

In one embodiment, the image side surface of the second lens is concave.

In one embodiment, the image-side surface of the second lens is convex.

In one embodiment, the image-side surface of the third lens element is convex.

In one embodiment, the image side surface of the third lens is concave.

In one embodiment, the third lens is an aspheric lens.

In one embodiment, the optical lens includes a diaphragm positioned between the first lens and the second lens.

In one embodiment, a distance TTL between a center of an object-side surface of the first lens and an image plane of the optical lens on the optical axis, a maximum field angle FOV of the optical lens, and an image height H corresponding to the maximum field angle of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.05.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy: R1/R2 is more than or equal to 0 and less than or equal to 15.

In one embodiment, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: D/H/FOV is less than or equal to 0.025.

In one embodiment, a distance BFL on the optical axis from the center of the image-side surface of the third lens to the imaging surface of the optical lens and a distance TTL on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens may satisfy: BFL/TTL is more than or equal to 0.1.

In one embodiment, the effective focal length F2 of the second lens and the effective focal length F3 of the third lens may satisfy: | F2/F3| is less than or equal to 2.5.

In one embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: (FOV F)/H.gtoreq.55.

In one embodiment, the radius of curvature R4 of the object-side surface of the second lens and the radius of curvature R5 of the image-side surface of the second lens may satisfy: | R4/R5 |. Is less than or equal to 1.

In one embodiment, the radius of curvature R6 of the object-side surface of the third lens and the radius of curvature R7 of the image-side surface of the third lens may satisfy: | R6/R7 |. Is less than or equal to 1.

In one embodiment, a distance T12 between the center of the image-side surface of the first lens and the center of the object-side surface of the second lens on the optical axis and a distance TTL between the center of the object-side surface of the first lens and the imaging surface of the optical lens on the optical axis may satisfy: T12/TTL is less than or equal to 0.5.

In one embodiment, the total effective focal length F of the optical lens and the radius of curvature R1 of the object-side surface of the first lens may satisfy: and the | F/R1| is more than or equal to 0.04.

In one embodiment, a distance TTL between a center of an object side surface of the first lens element and an imaging surface of the optical lens on an optical axis and a total effective focal length F of the optical lens may satisfy: TTL/F is less than or equal to 8.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R4 of the object-side surface of the second lens may satisfy: the ratio of (R2-R4)/(R2 + R4) is more than or equal to-2 and less than or equal to 1.

In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens may satisfy: the absolute value of F3/F is more than or equal to 2.5 and less than or equal to 5.5.

In one embodiment, the total effective focal length F of the optical lens and the F-number FNO of the optical lens may satisfy: F/FNO is not less than 0.8.

In one embodiment, the maximum field angle FOV of the optical lens and the image height H corresponding to the maximum field angle of the optical lens may satisfy: FOV/H is more than or equal to 30.

In one embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens may satisfy: the ratio of F2/F is less than or equal to 5.

In one embodiment, a radius of curvature R1 of an object-side surface of the first lens, a radius of curvature R2 of an image-side surface of the first lens, and a center thickness T1 of the first lens on the optical axis may satisfy: R1/(R2 + T1) is more than or equal to 3 and less than or equal to 10.

In one embodiment, the total effective focal length F of the optical lens, the radius of curvature R4 of the object-side surface of the second lens, and the radius of curvature R5 of the image-side surface of the second lens may satisfy: the absolute value of F/R4 plus absolute value of F/R5 is more than or equal to 0.2 and less than or equal to 2.

In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens may satisfy: the absolute value of F1/F is more than or equal to 1 and less than or equal to 5.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the total effective focal length F of the optical lens may satisfy: R2/F is more than or equal to 0.6.

In one embodiment, the radius of curvature R6 of the object-side surface of the third lens and the effective focal length F3 of the third lens may satisfy: R6/F3 is less than or equal to 1.1.

In one embodiment, the abbe number V1 of the first lens, the abbe number V2 of the second lens, and the abbe number V3 of the third lens may satisfy: v1+ V2+ V3 is more than or equal to 85.

In one embodiment, a distance TTL between a center of an object-side surface of the first lens element and an image plane of the optical lens on the optical axis may satisfy an image height H corresponding to a maximum field angle of the optical lens: TTL/H is more than or equal to 2.85 and less than or equal to 3.8.

In one embodiment, an opening angle arctan (1/K (S2)) of the image-side surface of the first lens corresponding to the maximum field angle of the optical lens may satisfy: arctan (1/K (S2)) > 50 degrees.

In one embodiment, an image height H corresponding to a maximum field angle of the optical lens, a total effective focal length F of the optical lens, and a distance TTL on an optical axis from a center of an object-side surface of the first lens to an image plane of the optical lens may satisfy: H/(F x TTL) is more than or equal to 0.15 and less than or equal to 0.45.

In one embodiment, the total effective focal length F of the optical lens, the effective focal length F1 of the first lens, the effective focal length F2 of the second lens, and the effective focal length F3 of the third lens may satisfy: i F/(F1 XF 2 XF 3) I is less than or equal to 0.15.

In one embodiment, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the maximum field angle θ of the optical lens in radians may satisfy: D/H/theta is less than or equal to 0.85.

Another aspect of the present disclosure provides an optical lens assembly, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having positive optical power; and a third lens having a positive optical power. The distance BFL from the center of the image side surface of the third lens to the imaging surface of the optical lens on the optical axis and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis can satisfy the following conditions: BFL/TTL is more than or equal to 0.1.

In one embodiment, the first lens element has a convex object-side surface and a concave image-side surface.

In one embodiment, the second lens element has a convex object-side surface and a concave image-side surface.

In one embodiment, the object-side surface of the second lens element is convex and the image-side surface of the second lens element is convex.

In one embodiment, the object-side surface of the third lens element is convex and the image-side surface of the third lens element is convex.

In one embodiment, the third lens element has a convex object-side surface and a concave image-side surface.

In one embodiment, the third lens is an aspheric lens.

In one embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: (FOV × F)/H.gtoreq.55.

In one embodiment, a distance TTL between a center of an object-side surface of the first lens element and an image plane of the optical lens on the optical axis and a total effective focal length F of the optical lens may satisfy: TTL/F is less than or equal to 8.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R4 of the object-side surface of the second lens may satisfy: -2 is more than or equal to (R2-R4)/(R2 + R4) is more than or equal to 1.

In one embodiment, the total effective focal length F of the optical lens, the radius of curvature R4 of the object-side surface of the second lens, and the radius of curvature R5 of the image-side surface of the second lens may satisfy: the absolute value of F/R4 and the absolute value of F/R5 are more than or equal to 0.2 and less than or equal to 2.

In one embodiment, a distance TTL between a center of an object-side surface of the first lens element and an image plane of the optical lens on the optical axis and an image height H corresponding to a maximum field angle of the optical lens may satisfy: TTL/H is more than or equal to 2.85 and less than or equal to 3.8.

In one embodiment, an image height H corresponding to a maximum field angle of the optical lens, a total effective focal length F of the optical lens, and a distance TTL on an optical axis from a center of an object-side surface of the first lens to an image plane of the optical lens may satisfy: H/(FxTTL) is more than or equal to 0.15 and less than or equal to 0.45.

In one embodiment, the total effective focal length F of the optical lens, the effective focal length F1 of the first lens, the effective focal length F2 of the second lens, and the effective focal length F3 of the third lens may satisfy: the ratio of F/(F1 × F2 × F3) | is less than or equal to 0.15.

Another aspect of the present application provides an electronic device. The electronic device comprises the optical lens provided by the application and an imaging element for converting an optical image formed by the optical lens into an electric signal.

This application has adopted three lens, through optimizing shape, the focal power etc. that sets up each lens, makes optical lens have at least one beneficial effect such as miniaturization, high resolution, back focal length, temperature performance are good, low cost, high imaging quality.

Drawings

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

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

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

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

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

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

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

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

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

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present 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 this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 object is called the object-side surface of the lens, and the surface of each lens closest to the image-forming side is called the image-side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after the list of listed features, that the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to examples or illustrations.

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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

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, three lenses having optical powers, i.e., a first lens, a second lens, and a third lens. The three lenses are arranged along the optical axis in sequence from the object side to the image side.

In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image plane. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

In an exemplary embodiment, the first lens may have a negative power. The first lens may have a convex-concave type. Set up first lens into the falcate shape towards the object space, but the light ray of can dispersing is favorable to making the accurate rear optical lens that steadily gets into of light, improves the camera lens resolution, is favorable to collecting big visual field light as much as possible, gets into rear optical system, increases the light flux of camera lens, promotes the illuminance. In practical application, the outdoor installation and use environment of the vehicle-mounted lens is considered, and the vehicle-mounted lens may be in severe weather such as rain, snow and the like, and the focal power and the surface type of the first lens are arranged, so that water drops can slide off favorably, and the influence on imaging can be reduced favorably.

In an exemplary embodiment, the second lens may have a positive optical power. The second lens may have a convex-convex type or a convex-concave type. The arrangement of the focal power and the surface type of the second lens is beneficial to collecting and converging light rays, so that the light rays are in smooth transition and smoothly enter a rear optical system, the collection of light rays with a large field of view as much as possible is facilitated, the light flux of the lens is increased, and the illumination is improved. Meanwhile, the spherical aberration introduced by the front lens can be compensated, the aberration generated by the front lens can be further corrected, the aperture of the lens can be increased, the total length of the lens can be shortened, the optical system is more compact, and the optical lens has relatively short total lens length.

In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex type or a convex concave type. The focal power and the surface type of the third lens are beneficial to smooth light entering an image surface, so that the image resolution is improved, various aberrations of the optical system are fully corrected, and on the premise of compact structure, the resolution ratio can be improved, and the optical performances such as distortion, CRA and the like are optimized. Preferably, the third lens may have an aspherical mirror surface, which may further improve the resolution.

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 distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, FOV is 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. More specifically, TTL, H, and FOV further satisfy: TTL/H/FOV is less than or equal to 0.04. The TTL/H/FOV is less than or equal to 0.05, the length of the lens can be effectively limited under the condition that the same imaging surface and the same image height are achieved, and the miniaturization of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R1/R2 is not less than 0 and not more than 15, wherein R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens. More specifically, R1 and R2 may further satisfy: R1/R2 is more than or equal to 1 and less than or equal to 13. R1/R2 is more than or equal to 0 and less than or equal to 15, the shape of the lens can be more reasonable, light rays with larger angles can be collected to enter a rear optical system, the caliber of the front end of the lens is reduced, the size is reduced, and the miniaturization is realized while the resolution is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.025, wherein FOV is the maximum field angle of the optical lens, D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, D, H and FOV further may satisfy: D/H/FOV is less than or equal to 0.02. The D/H/FOV is less than or equal to 0.025, the aperture of the front end of the lens is reduced, and the miniaturization is realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and BFL/TTL is more than or equal to 0.1, wherein BFL is the distance from the center of the image side surface of the third lens to the imaging surface of the optical lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, BFL and TTL further satisfy: BFL/TTL is more than or equal to 0.12. The requirement that BFL/TTL is more than or equal to 0.1 is met, the back focal length of the lens can be realized on the basis of realizing miniaturization, and the assembly of the module is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: | F2/F3| ≦ 2.5, wherein F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens. More specifically, F2 and F3 may further satisfy: | F2/F3| is less than or equal to 2. Satisfy | F2/F3| ≦ 2.5, can help the light to be gentle excessive, be favorable to correcting the chromatic aberration, promote the image quality, and can effectively improve the lens thermal compensation.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV × F)/H ≧ 55, where FOV is the maximum angle of view of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum angle of view of the optical lens. More specifically, FOV, F and H further satisfy: (FOV × F)/H.gtoreq.60. Satisfies (FOV multiplied by F)/H ≥ 55, and can make the lens satisfy large field angle.

In an exemplary embodiment, an optical lens according to the present application may satisfy: | R4/R5 |. 1, where R4 is the radius of curvature of the object-side surface of the second lens element, and R5 is the radius of curvature of the image-side surface of the second lens element. More specifically, R4 and R5 may further satisfy: | R4/R5 |. Is less than or equal to 0.8. Satisfying |. R4/R5 |. 1, it is beneficial for the second lens to collect more light and increase the light transmission capacity of the system.

In an exemplary embodiment, an optical lens according to the present application may satisfy: | R6/R7 |. 1, where R6 is the radius of curvature of the object-side surface of the third lens element, and R7 is the radius of curvature of the image-side surface of the third lens element. More specifically, R6 and R7 may further satisfy: | R6/R7 |. Is less than or equal to 0.8. Satisfying |. R6/R7 | ≦ 1, the light collected by the second lens can be compressed, so that the trend of the light is relatively gentle, the light is stably transited to the rear, the system aberration can be effectively reduced, the imaging quality of the system is improved, and the high-quality and bright image can be obtained.

In an exemplary embodiment, an optical lens according to the present application may satisfy: T12/TTL is less than or equal to 0.5, wherein T12 is the distance between the center of the image side surface of the first lens and the center of the object side surface of the second lens on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis. More specifically, T12 and TTL further can satisfy: T12/TTL is less than or equal to 0.4. T12/TTL is less than or equal to 0.5, light rays near the diaphragm can be in smooth transition, and image quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F/R1| ≧ 0.04, wherein F is the total effective focal length of the optical lens, and R1 is the radius of curvature of the object-side surface of the first lens. More specifically, F and R1 may further satisfy: and the | F/R1| is more than or equal to 0.05. The requirement that F/R1 is more than or equal to 0.04 can help to make the refraction angle change of incident light more moderate, avoid too strong refraction change to generate too much aberration, be beneficial to the manufacture of the first lens and reduce tolerance sensitivity.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 8, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F further satisfy: TTL/F is less than or equal to 7.7. The TTL/F is less than or equal to 8, the length of the lens can be effectively limited, and the miniaturization of the lens is realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -2 ≦ (R2-R4)/(R2 + R4) ≦ 1, wherein R2 is the radius of curvature of the image-side surface of the first lens and R4 is the radius of curvature of the object-side surface of the second lens. More specifically, R2 and R4 may further satisfy: the ratio of (R2-R4)/(R2 + R4) is more than or equal to-1 and less than or equal to 0.5. Satisfy (R2-R4)/(R2 + R4) ≦ 1 of-2, can correct the aberration of optical system, and when guaranteeing that the light that is emergent from first lens is incited to the first face of second lens, the incident light is comparatively gentle, thereby reduces optical system's tolerance sensitivity.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F | is more than or equal to 2.5 and less than or equal to 5.5, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens. More specifically, F3 and F further satisfy: the absolute value of F3/F is more than or equal to 2.55 and less than or equal to 4.5. The absolute F3/F is more than or equal to 2.5 and less than or equal to 5.5, which is beneficial to light collection and ensures the light transmission quantity of the system.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F/FNO is more than or equal to 0.8, wherein F is the total effective focal length of the optical lens, and FNO is the F-number of the optical lens. More specifically, F and FNO may further satisfy: F/FNO is more than or equal to 0.9. The F/FNO is more than or equal to 0.8, and the lens is favorably provided with a large aperture.

In an exemplary embodiment, an optical lens according to the present application may satisfy: FOV/H ≧ 30, where FOV is 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. More specifically, FOV and H further satisfy: FOV/H is greater than or equal to 32. The FOV/H is more than or equal to 30, which is beneficial to ensuring that the lens has a large field angle.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F2/F | < 5, wherein F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical lens. More specifically, F2 and F further may satisfy: the ratio of F2/F is less than or equal to 4. The absolute value of F2/F is less than or equal to 5, which is beneficial to realizing thermal compensation and ensures that the lens can obtain better image quality under the conditions of high and low temperatures.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R1/(R2 + T1) ≦ 10, where R1 is a radius of curvature of an object-side surface of the first lens, R2 is a radius of curvature of an image-side surface of the first lens, and T1 is a center thickness of the first lens on the optical axis. More specifically, R1, R2 and T1 may further satisfy: R1/(R2 + T1) is more than or equal to 4 and less than or equal to 9. Satisfy 3 ≤ R1/(R2 + T1) ≦ 10, can make peripheral light and central light have the optical path difference, diffuse central light, get into rear optical system, and reduce the camera lens front end bore, reduce the volume, be favorable to camera lens miniaturization and cost reduction.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and the absolute value of F/R4 plus absolute value of F/R5 is less than or equal to 2, wherein F is the total effective focal length of the optical lens, R4 is the curvature radius of the object side surface of the second lens, and R5 is the curvature radius of the image side surface of the second lens. More specifically, F, R4 and R5 may further satisfy: the absolute value of F/R4 plus absolute value of F/R5 is more than or equal to 0.2 and less than or equal to 1.5. The condition that F/R4 + F/R5 is less than or equal to 0.2 is met, incident light can be assisted to enter the optical photographing lens system, astigmatism can be effectively corrected, and the imaging quality is favorably improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F1/F | is more than or equal to 1 and less than or equal to 5, wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens. More specifically, F1 and F further may satisfy: the absolute value of F1/F is more than or equal to 1.2 and less than or equal to 5. The condition that | F1/F | is more than or equal to 1 and less than or equal to 5 is met, and the resolution can be improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R2/F is more than or equal to 0.6, wherein R2 is the curvature radius of the image side surface of the first lens, and F is the total effective focal length of the optical lens. More specifically, R2 and F further may satisfy: R2/F is more than or equal to 0.8. R2/F is more than or equal to 0.6, which is beneficial to correcting aberration.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R6/F3 is less than or equal to 1.1, wherein R6 is the curvature radius of the object side surface of the third lens, and F3 is the effective focal length of the third lens. More specifically, R6 and F3 further may satisfy: R6/F3 is less than or equal to 1. R6/F3 is less than or equal to 1.1, and the imaging quality can be further ensured.

In an exemplary embodiment, an optical lens according to the present application may satisfy: v1+ V2+ V3 is not less than 85, wherein V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens. More specifically, V1, V2 and V3 may further satisfy: v1+ V2+ V3 is more than or equal to 90. The requirement that V1+ V2+ V3 is more than or equal to 85 is met, and the aberration of the optical system can be further corrected.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H is more than or equal to 2.85 and less than or equal to 3.8, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, TTL and H may further satisfy: TTL/H is more than or equal to 2.85 and less than or equal to 3.5. TTL/H is more than or equal to 2.85 and less than or equal to 3.8, the optical total length of the lens assembly can be effectively compressed, and the miniaturization design of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and arctan (1/K (S2)) > or more than 50 degrees, wherein the arctan (1/K (S2)) is an opening angle of the image side surface of the first lens corresponding to the maximum field angle of the optical lens. More specifically, arctan (1/K (S2)) may further satisfy: arctan (1/K (S2)) > 52 deg. The arctan (1/K (S2)) is more than or equal to 50 degrees, so that the high-angle peripheral light rays entering through the first lens can be focused quickly, and the imaging quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: H/(F multiplied by TTL) is more than or equal to 0.15 and less than or equal to 0.45, wherein H is the image height corresponding to the maximum field angle of the optical lens, F is the total effective focal length of the optical lens, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, H, F and TTL further may satisfy: H/(FxTTL) is more than or equal to 0.18 and less than or equal to 0.40. H/(FxTTL) is more than or equal to 0.15 and less than or equal to 0.45, the optical total length of the lens component can be effectively compressed, and the miniaturization of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F/(F1 × F2 × F3) | is less than or equal to 0.15, wherein F is the total effective focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens. More specifically, F1, F2, and F3 may further satisfy: the ratio of F/(F1 × F2 × F3) | is less than or equal to 0.1. Satisfying | F/(F1 XF 2 XF 3) | less than or equal to 0.15, and balancing the configuration of refractive power of the lens to effectively correct the aberration of the lens and reduce the sensitivity of the thin optical lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/theta is less than or equal to 0.85, wherein D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, H is the image height corresponding to the maximum field angle of the optical lens, and theta is the maximum field angle of the optical lens in radian. More specifically, D, H, and θ further satisfy: D/H/theta is less than or equal to 0.8. Satisfies the D/H/theta not more than 0.85, is beneficial to reducing the caliber of the front end of the lens and is beneficial to miniaturizing the lens.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the first lens and the second lens to further improve the imaging quality of the optical lens. The diaphragm is arranged between the first lens and the second lens, so that the front and the back light beams are converged, the total length of the system is shortened, and the size of a lens at the rear end of the system diaphragm is reduced. In the embodiment of the present application, the stop may be disposed in the vicinity of the image side surface of the first lens or in the vicinity of the object side surface of the second lens. It should be noted, however, that the positions of the diaphragms disclosed herein are merely examples and not limitations; in alternative embodiments, the diaphragm may be disposed at other positions according to actual needs.

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

In an exemplary embodiment, the first lens and the second lens may be spherical lenses; the third lens may be an aspheric lens. The specific number of the spherical lenses and the aspherical lenses is not particularly limited, and the number of the aspherical lenses can be increased when the imaging quality is mainly embodied. In particular, in order to improve the resolution quality of the optical system, the first lens, the second lens, and the third lens may all be aspheric lenses. The aspheric 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 curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. The aspheric lens helps to correct system aberration and improve resolving power.

According to the optical lens of the above embodiment of the application, through reasonable setting of the shape and focal power of each lens, the optical lens has at least one beneficial effect of high resolution (megapixels), miniaturization, good temperature performance, large field of view, long back focal length, low cost, good imaging quality and the like. The optical lens adopts a three-piece type separation framework, so that the lens has more degrees of freedom, and high resolution of a large-angle lens is facilitated. The optical lens enables the back focal offset of the lens under high and low temperatures to be well controlled through reasonable material selection and collocation and reasonable arrangement of the focal length of the lens, has good temperature performance, and is favorable for meeting more severe use environment. The optical lens meets high resolution, is beneficial to realizing miniaturization of the lens, has longer back focal length and is convenient to install.

In an exemplary embodiment, the first lens, the second lens, and the third lens may all be glass lenses. The optical lens made of glass can inhibit the deviation of the back focus of the optical lens along with the temperature change so as to improve the stability of the system. Meanwhile, the glass material is adopted, so that the problem that the normal use of the lens is influenced due to the imaging blur of the lens caused by high and low temperature changes in the use environment can be avoided. Specifically, when the resolution quality and reliability are important, the first lens to the third lens may be all glass aspheric lenses. Of course, in the application where the requirement of temperature stability is low, the first lens to the third lens in the optical lens can also 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 third lens in the optical lens can also be made of plastic and glass in a matching way.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although three lenses are exemplified in the embodiment, the optical lens is not limited to including three lenses. The optical lens may also include other numbers of lenses, if desired. Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the 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 structural diagram of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

The first lens L1 is a convex-concave lens with negative refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 is a biconvex lens element with positive refractive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S6 and a convex image-side surface S7.

The optical lens may further include a stop STO, which may be disposed between the first and second lenses L1 and L2 to improve imaging quality. For example, the stop STO may be disposed between the first lens L1 and the second lens L2 at a position close to the object side surface S4 of the second lens L2.

Optionally, the optical lens may further include a filter L4 and/or a cover glass L4' having an object-side surface S8 and an image-side surface S9. The filter L4 and/or the protective glass L4' may be used to correct color deviations and/or to protect the image sensing chip IMA located at the imaging plane. The light from the object sequentially passes through the respective surfaces S1 to S9 and is finally imaged on the imaging plane.

Table 1 shows a curvature radius R, a thickness/distance T (it is understood that the thickness/distance T of a row in which S1 is located is a center thickness T1 of the first lens L1, the thickness/distance T of a row in which S2 is located is a separation distance T12 between the first lens L1 and the second lens L2, and so on) of each lens of the optical lens of example 1, a refractive index Nd, and an abbe number Vd.

TABLE 1

In embodiment 1, both the object-side surface S6 and the image-side surface S7 of the third lens L3 may be aspheric, and the profile x of each aspheric lens may be defined using, but not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the reciprocal of the radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The conical coefficient k and the high-order term coefficients A4, A6, A8, a10, a12, a14, and a16 that can be used for each of the aspherical mirror surfaces S6 and S7 in example 1 are given in table 2 below.

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S6

0.1707

-3.9599E-04

-8.7917E-04

-2.3055E-04

1.4715E-04

-1.9012E-05

-3.6036E-06

6.3134E-07

S7

-115.7234

1.1185E-02

2.1040E-04

-4.8161E-04

8.3553E-05

3.3914E-05

-1.5285E-05

1.7486E-06

TABLE 2

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

The optical lens may further include a stop STO, which may be disposed between the first lens L1 and the second lens L2 to improve imaging quality. For example, the stop STO may be disposed between the first lens L1 and the second lens L2 at a position close to the object side surface S4 of the second lens L2.

Optionally, the optical lens may further include a filter L4 and/or a cover glass L4' having an object side surface S8 and an image side surface S9. The filter L4 and/or the protective glass L4' may be used to correct color deviations and/or to protect the image sensing chip IMA located at the imaging plane. The light from the object passes through the respective surfaces S1 to S9 in order and is finally imaged on the imaging plane.

Table 3 shows the radius of curvature R, thickness/distance T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2. Table 4 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S6

-0.0511

-9.0358E-04

-8.0756E-04

-2.8092E-04

1.4829E-04

-1.9122E-05

-4.9153E-06

7.9901E-07

S7

210.1336

1.3938E-02

-4.1621E-05

-4.2994E-04

1.6234E-04

3.7265E-05

-2.7180E-05

3.7372E-06

TABLE 4

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 diagram of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

The first lens L1 is a convex-concave lens with negative refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 is a biconvex lens with positive refractive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a convex-concave lens element having positive refractive power, and has a convex object-side surface S6 and a concave image-side surface S7.

Table 5 shows the radius of curvature R, thickness/distance T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3. Table 6 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S6

-0.6781

-3.7521E-04

-3.7387E-04

-3.0663E-04

1.4297E-04

-2.1996E-05

-5.7928E-06

1.0522E-06

S7

210.1336

1.6064E-02

-1.7753E-04

-4.7233E-04

2.5310E-04

2.1299E-05

-5.3957E-05

8.6389E-06

TABLE 6

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 diagram of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

The first lens L1 is a convex-concave lens with negative refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 is a biconvex lens element with positive refractive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens element L3 is a convex-concave lens element having positive refractive power, and has a convex object-side surface S6 and a concave image-side surface S7.

Optionally, the optical lens may further include a filter L4 and/or a cover glass L4' having an object side surface S8 and an image side surface S9. The filter L4 and/or the protective glass L4' may be used to correct color deviations and/or to protect an image sensing chip IMA located at the imaging plane. The light from the object sequentially passes through the respective surfaces S1 to S9 and is finally imaged on the imaging plane.

Table 7 shows the radius of curvature R, thickness/distance T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4. Table 8 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S6

-0.7001

-4.5406E-04

-4.7001E-04

-3.6577E-04

1.3331E-04

-2.0100E-05

-5.6011E-06

9.1390E-07

S7

210.1336

1.6683E-02

-2.7263E-04

-4.7766E-04

2.8451E-04

2.2885E-05

-4.7698E-05

8.2804E-06

TABLE 8

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 diagram of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

The first lens L1 is a convex-concave lens with negative refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a convex-concave lens with positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The third lens element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S6 and a convex image-side surface S7.

Optionally, the optical lens may further include a filter L4 and/or a cover glass L4' having an object-side surface S8 and an image-side surface S9. The filter L4 and/or the protective glass L4' may be used to correct color deviations and/or to protect an image sensing chip IMA located at the imaging plane. The light from the object passes through the respective surfaces S1 to S9 in order and is finally imaged on the imaging plane.

Table 9 shows the radius of curvature R, thickness/distance T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5. Table 10 shows cone coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S6

-0.7990

-1.5522E-03

-6.9689E-04

-2.8704E-04

1.1802E-04

-3.5020E-05

-1.0684E-05

2.0642E-06

S7

-209.6234

1.0133E-02

2.6271E-03

-1.9424E-04

1.9913E-05

-2.6657E-05

-1.5222E-05

6.5868E-06

TABLE 10

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 diagram of an optical lens according to embodiment 6 of the present application.

As shown in fig. 6, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

Optionally, the optical lens may further include a filter L4 and/or a cover glass L4' having an object side surface S8 and an image side surface S9. The filter L4 and/or the protective glass L4' may be used to correct color deviations and/or to protect an image sensing chip IMA located at the imaging plane. The light from the object passes through the respective surfaces S1 to S9 in order and is finally imaged on the imaging plane.

Table 11 shows the radius of curvature R, thickness/distance T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 6. Table 12 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 11

TABLE 12

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 diagram of an optical lens according to embodiment 7 of the present application.

As shown in fig. 7, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

The first lens L1 is a convex-concave lens with negative refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a convex-concave lens with positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The third lens element L3 is a convex-concave lens element having positive refractive power, and has a convex object-side surface S6 and a concave image-side surface S7.

Table 13 shows the radius of curvature R, thickness/distance T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 7. Table 14 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 13

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S6

-1.1315

9.4285E-04

-1.3830E-03

-6.9689E-04

3.9294E-06

-1.0875E-05

3.0618E-06

-4.0843E-06

S7

200.0379

2.3376E-02

4.3919E-04

-1.2157E-03

-1.0410E-05

7.6346E-05

-3.4750E-05

7.7131E-06

TABLE 14

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 diagram of an optical lens according to embodiment 8 of the present application.

As shown in fig. 8, the optical lens assembly includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3.

Table 15 shows the radius of curvature R, thickness/distance T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 8. Table 16 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 15

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S6

-0.8894

1.8114E-03

-1.3233E-03

-6.4657E-04

-1.2073E-05

-1.5228E-05

3.0693E-06

-3.5484E-06

S7

159.8132

2.4034E-02

7.5590E-04

-1.3422E-03

-7.5737E-05

3.8109E-05

-4.2214E-05

8.4265E-06

TABLE 16

In conclusion, examples 1 to 8 satisfy the relationships shown in the following tables 17-1 and 17-2, respectively. In tables 17-1 and 17-2, D, H, F, BFL, TTL, T12, T1, F2, F3 are in units of millimeters (mm) and FOV is in units of degrees (°).

TABLE 17-1

TABLE 17-2

The present application also provides an electronic device that may include the optical lens according to the above-described embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a stand-alone electronic device such as a range finding camera or may be an imaging module integrated on a device such as a range finding device. In addition, the electronic device may also be a separate imaging device such as a vehicle-mounted camera, or may be an imaging module integrated on a system such as a driving assistance system.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The optical lens assembly, in order from an object side to an image side along an optical axis, comprises:

the first lens with negative focal power has a convex object-side surface and a concave image-side surface;

a second lens having a positive refractive power, the object-side surface of which is convex; and

and the object side surface of the third lens with positive focal power is a convex surface.

2. An optical lens as recited in claim 1, wherein the image-side surface of the second lens is concave.

3. An optical lens barrel according to claim 1, wherein the image side surface of the second lens element is convex.

4. An optical lens barrel according to claim 1, wherein the image side surface of the third lens element is convex.

5. An optical lens barrel according to claim 1, wherein the image side surface of the third lens is concave.

6. An optical lens according to claim 1, characterized in that the third lens is an aspherical mirror.

7. An optical lens according to claim 1, characterized in that the optical lens comprises a diaphragm, which is located between the first lens and the second lens.

8. The optical lens assembly according to any one of claims 1 to 7, wherein a distance TTL on the optical axis from a center of an object side surface of the first lens to an imaging surface of the optical lens, a maximum field angle FOV of the optical lens, and an image height H corresponding to the maximum field angle of the optical lens satisfy: TTL/H/FOV is less than or equal to 0.05.

9. The optical lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a negative optical power;

a second lens having a positive optical power; and

a third lens having a positive optical power,

the distance BFL from the center of the image side surface of the third lens to the imaging surface of the optical lens on the optical axis and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following conditions: BFL/TTL is more than or equal to 0.1.

10. An electronic apparatus, characterized by comprising the optical lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.