CN114509859A

CN114509859A - Optical lens and electronic device

Info

Publication number: CN114509859A
Application number: CN202011288269.6A
Authority: CN
Inventors: 金嘉俊; 王东方; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2022-05-17
Anticipated expiration: 2040-11-17
Also published as: CN114509859B

Abstract

The application discloses an optical lens and an electronic device including the same. The optical lens sequentially comprises the following components from an object side to an image side along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens element having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a third lens having a positive optical power; the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface; a fifth lens having a negative optical power; and a sixth lens with positive focal power, wherein the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface.

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

With the development of scientific technology, optical lenses have played an irreplaceable role in more and more fields. Optical lenses are required in the fields of driving assistance, monitoring, projection technology, industry, and the like, such as automobiles. Furthermore, the demands for the performance of the optical lens in different fields are more and more diversified. For example, rear-view and around-view optical lenses in the field of driving assistance of automobiles and the like are required to expand the visual field of drivers to a great extent, realize visual automatic driving assistance, and improve driving safety.

In view of the fact that optical lenses used in most technical fields need to work in environments with large temperature differences, such as changeful and bad, it is important that the optical lenses have good temperature performance. That is, the optical lens needs to maintain stable performance at different temperatures. In addition, there is a need for an optical lens system having at least one of a large field angle, high resolution, small overall length, and high image quality.

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 element having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a third lens having a positive optical power; the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface; a fifth lens having a negative optical power; and a sixth lens with positive focal power, wherein the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface.

In one embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens.

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 fifth lens element has a concave object-side surface and a concave image-side surface.

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

In one embodiment, the second lens, the fourth lens, and the fifth lens are each rotationally symmetric aspheric lenses.

In one embodiment, the first lens and the third lens are glass lenses.

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.50.

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 16.

In one embodiment, a distance TTL from a center of an object-side surface of the first lens to an imaging surface of the optical lens on the optical axis, an image height H corresponding to a maximum field angle FOV of the optical lens, and a maximum field angle of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.1.

In one embodiment, a distance BFL between a center of an image-side surface of the sixth lens and an image plane of the optical lens on the optical axis and a distance TL between a center of an object-side surface of the first lens and a center of an image-side surface of the sixth lens on the optical axis may satisfy: BFL/TL is more than or equal to 0.15.

In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F5 of the fifth lens may satisfy: the absolute value of F4/F5 is more than or equal to 0.5 and less than or equal to 1.6.

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 2 and less than or equal to 90.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the effective focal length F1 of the first lens may satisfy: the ratio of R2/F1 is 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 1 and less than or equal to 90.

In one embodiment, the effective focal length F2 of the second lens and the effective focal length F6 of the sixth lens may satisfy: the absolute value of F2/F6 is more than or equal to 0.4 and less than or equal to 1.2.

In one embodiment, the effective focal length F45 of the cemented lens formed by the fourth lens and the fifth lens cemented together and the total effective focal length F of the optical lens may satisfy: the absolute value of F45/F is less than or equal to 5 and less than or equal to 16.

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: and the | R1/R2| is more than or equal to 2.

In one embodiment, a distance d6 between the center of the image-side surface of the third lens and the center of the object-side surface of the fourth 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: d6/TTL is less than or equal to 0.08.

In one embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: the ratio of R9 to R10 is less than or equal to 0.9.

Another aspect of the present application provides an optical lens. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; and a sixth lens having positive optical power. The effective focal length F2 of the second lens and the effective focal length F6 of the sixth lens satisfy: the absolute value of F2/F6 is more than or equal to 0.4 and less than or equal to 1.2.

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 concave object-side surface and a concave image-side surface.

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

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

In one embodiment, the first lens and the third lens are glass lenses.

In one embodiment, the effective focal length F45 of the cemented lens formed by the fourth lens and the fifth lens cemented together and the total effective focal length F of the optical lens can satisfy: the absolute value of F45/F is less than or equal to 5 and less than or equal to 16.

In one embodiment, a distance d6 on the optical axis from the center of the image-side surface of the third lens to the center of the object-side surface of the fourth 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: d6/TTL is less than or equal to 0.08.

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 six 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, wide angle, high resolution, temperature performance are good, low cost, back focal length, simple structure, 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 structural view showing an optical lens according to embodiment 7 of the present application;

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

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

fig. 10 is a schematic view showing a structure of an optical lens according to embodiment 10 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 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 a list of listed features, 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 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 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, six lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six 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. The first lens has negative focal power, so that the imaging quality is improved, the phenomenon that the light rays on the object space are dispersed too much is avoided, and the aperture of the rear lens is controlled. The surface-type arrangement of the first lens is beneficial to increasing the field angle and collecting large-angle light rays. Particularly, the object side surface of the first lens is set to be a convex surface, so that the light rays with a large view field can be collected as far as possible and enter a rear optical system, the light flux is increased, and the whole large view field range of the lens can be realized; meanwhile, the object side surface of the first lens is a convex surface, so that the lens is favorable for water drops to slide off under outdoor use environments such as rainy and snowy weather, and the influence on imaging is reduced

In an exemplary embodiment, the second lens may have a negative power. The second lens may have a concave surface type. The focal power and the surface type arrangement of the second lens can further diverge the light rays, adjust the light rays and reduce chromatic aberration.

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 can converge light rays, and the light rays are adjusted to enable the light rays to stably transit to the rear. By controlling the effective focal length of the third lens, the light trend from the first lens to the third lens can be controlled, so that the lens has a compact structure.

In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex type.

In an exemplary embodiment, the fifth lens may have a negative power. The fifth lens may have a concave-convex type or a concave-convex type.

In an exemplary embodiment, the sixth lens may have a positive optical power. The sixth lens may have a convex type. The focal power and the surface type of the sixth lens are favorable for converging light rays and adjusting the light rays, so that the light rays can be smoothly transited to an imaging surface.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV multiplied by F)/H is larger than or equal to 50, wherein 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.52. Satisfies (FOV multiplied by F)/H more than or equal to 50, and is beneficial to realizing wide-angle characteristics.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 16, 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 15. The TTL/F is less than or equal to 16, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/FOV is less than or equal to 0.1, 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 0.05. The TTL/H/FOV is less than or equal to 0.1, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: BFL/TL is more than or equal to 0.15, wherein BFL is the distance between the center of the image side surface of the sixth lens and the imaging surface of the optical lens on the optical axis, TL is the distance between the center of the object side surface of the first lens and the center of the image side surface of the sixth lens on the optical axis. More specifically, BFL and TL may further satisfy: BFL/TL is more than or equal to 0.17. The BFL/TL ratio is more than or equal to 0.15, which is beneficial to realizing the miniaturization, leading the back focal length of the optical lens to be longer and being beneficial to the assembly of the lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F4/F5| is more than or equal to 0.5 and less than or equal to 1.6, wherein F4 is the effective focal length of the fourth lens, and F5 is the effective focal length of the fifth lens. More specifically, F4 and F5 may further satisfy: the absolute value of F4/F5 is more than or equal to 0.8 and less than or equal to 1.3. The absolute value of F4/F5 is more than or equal to 0.5 and less than or equal to 1.6, so that the performance of the lens can be kept stable at different temperatures; the focal lengths of the two adjacent lenses are close, so that light can be smoothly transited, and the resolution quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 2 ≦ F1/F ≦ 90, where 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 satisfy: the absolute value of F1/F is more than or equal to 2.5 and less than or equal to 8. Satisfy 2 ≦ F1/F | ≦ 90, be favorable to reducing the front end bore, improve imaging quality, can avoid first lens object side camber too big simultaneously to the production of aberration when effectively avoiding light to be incident, and be favorable to the preparation of first lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R2/F1| ≦ 1, wherein R2 is the radius of curvature of the image-side surface of the first lens, and F1 is the effective focal length of the first lens. More specifically, R2 and F1 may further satisfy: the ratio of R2/F1 is less than or equal to 0.8. The requirement that R2/F1 is less than or equal to 1 is met, so that tolerance sensitivity of the first lens is reduced, and assembly of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F | is less than or equal to 1 and less than or equal to 90, 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 1.5 and less than or equal to 8. The absolute F3/F is more than or equal to 1 and less than or equal to 90, which is beneficial to keeping the stable performance of the lens at different temperatures.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F2/F6| is more than or equal to 0.4 and less than or equal to 1.2, wherein F2 is the effective focal length of the second lens, and F6 is the effective focal length of the sixth lens. More specifically, F2 and F6 may further satisfy: the absolute value of F2/F6 is more than or equal to 0.6 and less than or equal to 0.95. The absolute value of F2/F6 is more than or equal to 0.4 and less than or equal to 1.2, and the performance stability of the lens can be kept at different temperatures.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F45/F | is less than or equal to 5 and less than or equal to 16, wherein F45 is the effective focal length of a cemented lens formed by the fourth lens and the fifth lens through the cementing, and F is the total effective focal length of the optical lens. More specifically, F45 and F further satisfy: the absolute value of F45/F is more than or equal to 6 and less than or equal to 15. The requirement that | F45/F | is more than or equal to 5 and less than or equal to 16 is met, and the stability of the performance of the lens can be kept at different temperatures.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R1/R2| ≧ 2, where R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens. More specifically, R1 and R2 may further satisfy: the | R1/R2| ≧ 2.5. The condition that the absolute value of R1/R2 is more than or equal to 2 is met, the field angle is increased, and large-angle light rays are collected.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and d6/TTL is less than or equal to 0.08, wherein d6 is the distance between the center of the image side surface of the third lens and the center of the object side surface of the fourth 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, d6 and TTL further satisfy: d6/TTL is less than or equal to 0.07. D6/TTL is less than or equal to 0.08, the total length of the lens is favorably shortened, and miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R9/R10| ≦ 0.9, wherein R9 is the radius of curvature of the object-side surface of the fifth lens, and R10 is the radius of curvature of the image-side surface of the fifth lens. More specifically, R9 and R10 may further satisfy: the ratio of R9 to R10 is less than or equal to 0.7. Satisfying | R9/R10| ≦ 0.9 is beneficial to reducing the sensitivity of the cemented lens formed by the fourth lens and the fifth lens, and enabling light to smoothly transit to the rear optical system.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the third lens and the fourth lens to further improve the imaging quality of the optical lens. The diaphragm is arranged between the third lens and the fourth lens, so that light rays entering the optical lens can be effectively converged, the aperture of the lens is reduced, and the total length of the optical lens is shortened. In the embodiment of the present application, the stop may be disposed in the vicinity of the image side surface of the third lens or in the vicinity of the object side surface of the fourth 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 sixth 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.

As known to those skilled in the art, cemented lenses may be used to minimize or eliminate chromatic aberration. The cemented lens used in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby realizing high resolution and improving the imaging definition of the lens. In addition, the use of the cemented lens can also simplify the assembly process in the lens manufacturing process.

In an exemplary embodiment, the fourth lens and the fifth lens may be cemented to form a cemented lens. The fourth lens with positive focal power and the convex object-side surface and the convex image-side surface are glued with the fifth lens with negative focal power and the concave object-side surface, so that light rays emitted by the front lens can be smoothly transited to the rear optical system, the compact structure of the optical lens is facilitated, the size of the optical lens is reduced, various aberrations of the optical lens are facilitated to be corrected, the matching sensitivity of each lens is reduced, the resolution is improved, and the optical performances such as distortion, CRA (cross-cut optical) and the like are optimized. Of course, the fourth lens and the fifth lens may not be cemented, which is advantageous for improving the resolution.

The gluing mode adopted between the lenses has at least one of the following advantages: self color difference is reduced, tolerance sensitivity is reduced, and the integral color difference of the system is balanced through the residual partial color difference; reducing the separation distance between the two lenses, thereby reducing the overall length of the system; the assembling parts among the lenses are reduced, so that 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 the lens unit are reduced, and the production yield is improved; the light quantity loss caused by reflection among the lenses is reduced, and the illumination is improved; further reducing the field curvature and effectively correcting the off-axis point aberration of the optical lens. The gluing design shares the whole chromatic aberration correction of the system, effectively corrects the aberration so as to improve the resolving power, and enables the optical system to be compact as a whole and meet the miniaturization requirement.

In an exemplary embodiment, the first lens, the third lens, and the sixth lens may be spherical lenses; the second lens, the fourth lens, and the fifth lens may be aspheric lenses. Or the first lens and the third lens may be spherical lenses; the second lens, the fourth lens, the fifth lens, and the sixth lens may be aspheric lenses. 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, the third lens, the fourth lens, the fifth lens, and the sixth 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. Preferably, the second lens, the fourth lens, and the fifth lens may be rotationally symmetric aspherical lenses. The rotationally symmetric aspheric lens can effectively improve the field curvature and eliminate chromatic aberration.

According to the optical lens of the embodiment of the application, through reasonable setting of the shapes and the focal powers of the lenses, under the condition that only 6 lenses are used, the optical system has at least one beneficial effect of high resolution (more than two million pixels), wide angle, miniaturization, good temperature performance, long back focal length, simple structure, low cost, good imaging quality and the like. Meanwhile, the optical system also meets the requirements of small lens size, small front end caliber, shorter total length, good stability, low sensitivity and high production yield. Meanwhile, the optical lens also has better temperature performance, is favorable for the optical lens to have small change of imaging effect in high and low temperature environments, has stable image quality, and can be used in most environments.

According to the optical lens of the embodiment of the application, the cemented lens is arranged to share the whole chromatic aberration correction of the system, so that the system aberration can be corrected, the system resolution quality can be improved, the problem of matching sensitivity can be reduced, the whole structure of the optical system can be compact, and the miniaturization requirement can be met.

In an exemplary embodiment, the first lens and the third lens may be both glass lenses; the second lens, the fourth lens, the fifth lens, and the sixth lens may all be plastic lenses. The utility model provides an optical lens adopts glass lens and plastic lens to combine the setting, can compromise optical lens's temperature performance under reduce cost's prerequisite to guarantee that optical lens has stable optical property under the temperature of difference, can keep better formation of image definition promptly in certain temperature range. In particular, the first to sixth lenses in the optical lens may each be made of glass. 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 importance is paid to the resolution quality and the reliability, the first lens to the sixth lens may be all glass aspherical lenses. Of course, in the application where the requirement of temperature stability is low, the first lens to the sixth 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.

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 six lenses are exemplified in the embodiment, the optical lens is not limited to include six 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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens element L1 is a convex-concave lens element with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a convex-concave lens with positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element L6 is a biconvex lens element with positive power, i.e., the object-side surface S11 is convex, and the image-side surface S12 is convex. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed between the third lens L3 and the fourth lens L4 at a position close to the object side surface S8 of the fourth lens L4.

Optionally, the optical lens may further include a filter L7 having an object side S13 and an image side S14. The filter L7 can be used to correct color deviations. The optical lens may further include a protective glass L8 having an object-side surface S15 and an image-side surface S16. The protective glass L8 may be used to protect the image sensing chip IMA located at the imaging plane S17. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

Table 1 shows a radius of curvature R, a thickness/distance d (it is understood that the thickness/distance d of the row in which S1 is located is the center thickness d1 of the first lens L1, the thickness/distance d of the row in which S2 is located is the separation distance d2 between the first lens L1 and the second lens L2, and so on), a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1.

TABLE 1

In embodiment 1, the object-side surface S3 and the image-side surface S4 of the second lens L2, the object-side surface S8 and the image-side surface S9 of the fourth lens L4, the object-side surface S9 and the image-side surface S10 of the fifth lens L5, and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 may all be aspheric, and the profile x of each aspheric lens may be defined by, but is 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 being 1/R (i.e., paraxial curvature c is the inverse of 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 coefficients k and the higher-order term coefficients a4, a6, A8, a10, a12, a14 and a16 that can be used for each of the aspherical mirror surfaces S3, S4, S8, S9, S10, S11 and S12 in example 1 are given in table 2 below.

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S3

-220.0000

-3.6218E-02

1.9395E-02

-7.1230E-03

1.7910E-03

-2.9556E-04

2.8027E-05

-1.1233E-06

S4

-0.5051

-6.4405E-02

1.7641E-02

-2.8042E-03

-1.6174E-03

6.1508E-04

-1.5864E-04

2.5482E-05

S8

2.8710

-2.4045E-02

2.0383E-02

-5.4869E-02

5.7744E-02

-5.8800E-02

4.8940E-02

-1.8839E-02

S9

0.8080

-4.4373E-01

5.1601E-01

-3.7421E-01

1.1533E-01

-2.1273E-03

2.6700E-03

-6.2771E-04

S10

-81.9100

-1.2039E-01

1.7164E-01

-1.4874E-01

1.0128E-01

-4.9100E-02

1.4338E-02

-1.7597E-03

S11

-14.2476

-3.8706E-02

4.5216E-02

-2.5482E-02

1.0809E-02

-3.5680E-03

7.3294E-04

-6.7561E-05

S12

-1.0761

-4.2821E-03

2.9271E-03

-2.1452E-03

1.8519E-03

-7.4843E-04

1.4211E-04

-1.2211E-05

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, a description 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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

Table 3 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 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

S3

-579.7960

-3.7562E-02

1.9577E-02

-7.0934E-03

1.7935E-03

-2.9562E-04

2.7968E-05

-1.1272E-06

S4

-0.4926

-6.3914E-02

1.7410E-02

-2.7362E-03

-1.5826E-03

6.4626E-04

-1.4928E-04

2.7754E-05

S8

2.8835

-2.3897E-02

2.1813E-02

-5.5452E-02

5.8765E-02

-5.5803E-02

5.1126E-02

-2.5667E-02

S9

0.8080

-4.4483E-01

5.3377E-01

-3.9039E-01

1.0220E-01

1.2589E-02

2.6700E-03

-6.2772E-04

S10

-80.0410

-1.2084E-01

1.6985E-01

-1.4929E-01

1.0159E-01

-4.9106E-02

1.4300E-02

-1.8708E-03

S11

-12.5444

-4.0248E-02

4.6044E-02

-2.5042E-02

1.0896E-02

-3.5777E-03

7.2820E-04

-6.4632E-05

S12

-1.1610

-3.9263E-03

3.4231E-03

-2.0703E-03

1.8926E-03

-7.2856E-04

1.4743E-04

-1.1863E-05

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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

Table 5 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 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

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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens element L1 is a convex-concave lens element with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element L6 is a biconvex lens element with positive power, i.e., the object-side surface S11 is convex, and the image-side surface S12 is convex. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Optionally, the optical lens may further include a filter L7 having an object side S13 and an image side S14. The filter L7 can be used to correct color deviations. The optical lens may further include a protective glass L8 having an object-side surface S15 and an image-side surface S16. The protective glass L8 can be used to protect the image sensing chip IMA located at the imaging plane S17. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 7 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 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

S3

-11.9076

3.0712E-03

-9.2344E-04

1.0906E-04

-5.0667E-06

-1.2305E-08

S4

-0.4194

1.7708E-02

-5.6688E-03

7.3460E-04

-1.2198E-04

-2.5505E-06

S8

3.9397

-2.4393E-02

2.2425E-03

-3.8935E-02

4.1800E-02

-2.4385E-02

S9

-0.4120

-5.0744E-02

-4.1200E-02

6.5000E-02

-4.1317E-02

4.0678E-03

S10

-99.0000

-3.9800E-02

3.2608E-02

-8.0132E-03

7.9242E-04

-2.6167E-06

S11

-7.4496

9.4286E-04

3.1870E-03

1.6225E-03

-5.3740E-04

6.1538E-05

S12

-12.3203

-1.4399E-02

4.4619E-03

3.5019E-04

-5.4051E-06

6.1261E-05

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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

Table 9 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 5. Table 10 shows conic 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

S3

-10.8397

2.5172E-03

-8.7943E-04

1.1815E-04

-6.8738E-06

-1.2305E-08

S4

-0.2426

1.9212E-02

-5.3868E-03

9.0215E-04

-1.7296E-04

-2.5505E-06

S8

7.1880

-1.8891E-02

8.3576E-03

-4.4609E-02

4.8257E-02

-2.4385E-02

S9

-0.4663

-3.8606E-02

-3.7413E-02

3.8567E-02

-8.3466E-03

4.0678E-03

S10

99.0000

-4.2866E-02

2.4536E-02

-7.3513E-03

1.5108E-03

-2.6168E-06

S11

-6.5869

-7.1321E-03

3.1076E-03

2.1037E-03

-5.5907E-04

6.1539E-05

S12

-9.9211

-1.4406E-02

5.4390E-03

3.7876E-04

8.8326E-05

6.1261E-05

Watch 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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens element L1 is a convex-concave lens element with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 is a concave-convex lens element with negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element L6 is a biconvex lens element with positive power, i.e., the object-side surface S11 is convex, and the image-side surface S12 is convex. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 11 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 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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

Table 13 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 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

S3

-29.2971

3.7864E-03

-7.8647E-04

1.9050E-05

4.1717E-07

-1.2305E-08

S4

-0.1863

2.2912E-02

-4.4233E-03

3.4491E-03

-1.3293E-03

-2.5505E-06

S8

11.4267

-1.0586E-02

1.7383E-02

-5.2746E-02

5.6642E-02

-2.4385E-02

S9

-0.8925

-1.1217E-02

-5.3962E-02

-6.5499E-03

3.3707E-03

4.0678E-03

S10

-50.0000

-5.2117E-02

1.9530E-02

-5.7869E-03

7.2533E-04

-2.6168E-06

S11

-6.5500

-4.3230E-03

2.6266E-03

1.3559E-03

-8.2351E-04

6.1539E-05

S12

-53.9028

-7.0240E-03

7.0145E-03

1.2993E-03

-8.2913E-04

6.1261E-05

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 along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 is a concave-convex lens element with negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element L6 is a biconvex lens element with positive power, i.e., the object-side surface S11 is convex, and the image-side surface S12 is convex. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 15 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 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

S3

-23.4627

4.9767E-03

-9.7622E-04

2.7601E-05

2.7806E-06

-1.2305E-08

S4

0.1137

2.6922E-02

-5.4019E-03

1.7845E-03

-8.5778E-04

-2.5505E-06

S8

13.3568

-1.3207E-02

2.1089E-02

-5.5277E-02

5.4289E-02

-2.4385E-02

S9

-0.7425

-2.0008E-02

-5.4437E-02

-5.5884E-03

1.3008E-03

4.0678E-03

S10

-50.0000

-4.6957E-02

1.9473E-02

-5.7338E-03

7.4037E-04

-2.6168E-06

S11

-8.6246

6.9279E-04

2.7170E-03

6.8236E-04

-5.9126E-04

6.1539E-05

S12

-26.6433

-8.9511E-03

5.7698E-03

1.4342E-03

-7.3003E-04

6.1261E-05

TABLE 16

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 diagram of an optical lens according to embodiment 9 of the present application.

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

The first lens element L1 is a convex-concave lens element with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a convex-concave lens with positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element L4 is a biconvex lens element with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element L6 is a biconvex lens with positive power, i.e., has a convex object-side surface S11 and a convex image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 17 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 9. Table 18 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 17

Watch 18

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 assembly includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

Table 19 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 10. Table 20 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 10, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 19

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S3

14.4697

-8.2971E-03

6.0423E-03

-2.2904E-03

7.2835E-04

-1.5595E-04

1.8382E-05

-7.9219E-07

S4

-0.4968

-3.9904E-02

2.4505E-02

-3.6354E-02

3.3771E-02

-1.7613E-02

4.6194E-03

-4.7345E-04

S8

4.0812

-3.3146E-02

2.4519E-02

-7.1507E-02

6.0767E-02

-2.4342E-02

0.0000E+00

S9

-6.6112

-5.6079E-01

3.6259E-01

-2.2411E-02

-5.7722E-02

7.7115E-03

0.0000E+00

S10

-35.4355

-1.9176E-01

1.7190E-01

-7.3559E-02

2.0401E-02

-2.9934E-03

-6.5546E-04

2.6471E-04

S11

-13.2529

-1.0088E-01

6.8579E-02

-5.4472E-03

-8.9448E-03

3.9407E-03

-6.8258E-04

4.6106E-05

S12

-2.6819

-4.0537E-03

-6.9920E-04

-2.1440E-03

3.8403E-03

-1.4629E-03

1.9245E-04

0.0000E+00

Watch 20

In summary, examples 1 to 10 satisfy the relationships shown in tables 21-1 and 21-2 below, respectively. In tables 21-1 and 21-2, units of F, H, TTL, TL, BFL, F1, F2, F3, F4, F5, F6, F45, d6, R1, R2, R3, R4, R5, R6, R9, R10 are millimeters (mm), and units of FOV are degrees (°).

TABLE 21-1

TABLE 21-2

The present application also provides an electronic device that may include the optical lens according to the above-described embodiments 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. Furthermore, the electronic device may also be a stand-alone imaging device such as a vehicle-mounted camera, or may be an imaging module integrated on a driving assistance system such as a car.

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 as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents 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 element having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave;

a third lens having a positive optical power;

the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface;

a fifth lens having a negative optical power; and

the object side surface of the sixth lens with positive focal power is a convex surface, and the image side surface of the sixth lens is a convex surface.

2. An optical lens according to claim 1, wherein the fourth lens and the fifth lens are cemented to form a cemented lens.

3. An optical lens barrel according to claim 1, wherein the third lens element has a convex object-side surface and a convex image-side surface.

4. An optical lens barrel according to claim 1, wherein the third lens element has a convex object-side surface and a concave image-side surface.

5. An optical lens barrel according to claim 1, wherein the fifth lens element has a concave object-side surface and a concave image-side surface.

6. An optical lens barrel according to claim 1, wherein the fifth lens element has a concave object-side surface and a convex image-side surface.

7. An optical lens according to claim 1, wherein the second lens, the fourth lens and the fifth lens are rotationally symmetric aspherical lenses.

8. An optical lens according to claim 1, characterized in that the first lens and the third lens are glass lenses.

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 negative optical power;

a third lens having a positive optical power;

a fourth lens having positive optical power;

a fifth lens having a negative optical power; and

a sixth lens having positive optical power;

an effective focal length F2 of the second lens and an effective focal length F6 of the sixth lens satisfy: the absolute value of F2/F6 is more than or equal to 0.4 and less than or equal to 1.2.

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.