CN114859501A

CN114859501A - Optical lens and electronic device

Info

Publication number: CN114859501A
Application number: CN202110153694.2A
Authority: CN
Inventors: 姚波; 徐超; 张润泽; 邱光
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2022-08-05

Abstract

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

Background

With the rapid development of the automobile driving-assisting system, the optical lens is more and more widely applied to the automobile. Examples of systems that can use optical lenses are vehicle-mounted reversing vision systems, automobile data recorders, automatic and panoramic parking systems, road-finding systems, etc. The lens sensor plays an important role in the driving assistance system. Compared to other types of sensors that acquire ambient information, the lens sensor has the advantages of: the technology is mature, and the cost is low; the most comprehensive information can be obtained with a smaller amount of data.

For example, in-vehicle monitoring is used in increasing numbers. The mainstream trend of optical lenses for monitoring in the future is visible light (RGB) combined Infrared (IR) application, and visible light (RGB) is utilized in the daytime to distinguish colors so as to generate excellent daytime color images and videos; infrared (IR) is used at night, and then an algorithm is used to capture the information of the infrared light.

Meanwhile, in order to realize a wide-range monitoring of all the people and the environment in the vehicle, an optical lens having a large field angle is required. However, the lens used in the vehicle generally requires a small diameter of the front port and a minimized lens, so as to avoid affecting the installation of the interior trim and the appearance of the vehicle interior personnel.

There is a need for an optical lens having at least one of the benefits of miniaturization, large field of view, high imaging quality, stable imaging quality, low cost, etc.

Disclosure of Invention

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

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

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

In one embodiment, the image-side surface of the sixth lens element is concave.

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

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

In one embodiment, at least one of the first lens, the second lens, the fourth lens, the fifth lens, and the sixth lens has an aspherical mirror surface.

In one embodiment, the optical lens further includes a diaphragm disposed between the second lens and the third lens.

In one embodiment, a distance TTL from 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 the maximum field angle FOV of the optical lens satisfy: TTL/H/FOV is less than or equal to 0.04.

In one embodiment, the central radius of curvature R1 of the object-side surface of the first lens and the central radius of curvature R2 of the image-side surface of the first lens satisfy: R1/R2 is more than or equal to 1 and less than or equal to 10.

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 FOV of the optical lens, and the maximum field angle FOV of the optical lens satisfy: D/H/FOV is less than or equal to 0.02.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical lens on the optical axis and a distance BFL between an image side surface of the sixth lens element and the imaging surface of the optical lens on the optical axis satisfy: BFL/TTL is more than or equal to 0.1.

In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F5 of the fifth lens satisfy: the ratio of F4 to F5 is less than or equal to 2.

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 FOV of the optical lens satisfy: (FOV F)/H.gtoreq.40.

In one embodiment, the central radius of curvature R8 of the object-side surface of the fourth lens and the central radius of curvature R9 of the object-side surface of the fifth lens satisfy: the | R8/R9| ≧ 1.5.

In one embodiment, a distance d7 between the third lens and the fourth lens on the optical axis and a distance TTL between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis satisfy: d7/TTL is less than or equal to 0.1.

In one embodiment, the total effective focal length F of the optical lens and the central radius of curvature R1 of the object side of the first lens satisfy: and the | F/R1| is more than or equal to 0.5.

In one embodiment, a distance TTL between 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 satisfy: TTL/F is less than or equal to 7.

In one embodiment, the total effective focal length F of the optical lens, the center radius of curvature R3 of the object-side surface of the second lens, and the center radius of curvature R4 of the image-side surface of the second lens satisfy: the | + | F/R3| + | F/R4| < 2.5.

In one embodiment, the distance d7 between the third lens and the fourth lens on the optical axis and the distance BFL between the image side surface of the sixth lens and the imaging surface of the optical lens on the optical axis satisfy: the (d7 xBFL)/(d 7+ BFL) is more than or equal to 0.1 and less than or equal to 0.7.

In one embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F/ENPD is less than or equal to 2.5.

In one embodiment, the central radius of curvature R6 of the object-side surface of the third lens and the central radius of curvature R7 of the image-side surface of the third lens satisfy: more than or equal to-1.2 (R6-R7)/(R6+ R7) more than or equal to-0.2.

In one embodiment, the central radius of curvature R1 of the object-side surface of the first lens, the central radius of curvature R2 of the image-side surface of the first lens, and the distance d1 between the first lens and the second lens on the optical axis satisfy: R1/(R2+ d1) is less than or equal to 1.1.

In one embodiment, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: the absolute value of F6/F is more than or equal to 2 and less than or equal to 3.

Another aspect of the present application provides such 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 positive 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 distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, the image height H corresponding to the maximum field angle FOV of the optical lens and the maximum field angle FOV of the optical lens meet the following requirements: TTL/H/FOV is less than or equal to 0.04.

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 convex image-side surface.

In one embodiment, the third lens element has a convex 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 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 sixth lens element has a convex object-side surface and a concave 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 central radius of curvature R1 of the object-side surface of the first lens, the central radius of curvature R2 of the image-side surface of the first lens, and the separation distance d1 on the optical axis between the first lens and the second lens satisfy: R1/(R2+ d1) is less than or equal to 1.1.

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

The six lenses are adopted, the shape, focal power and the like of each lens are optimally set, so that the optical lens can realize high-definition resolution, for example, resolution of 5M level, and has at least one beneficial effect of large visual field, small front-end caliber, miniaturization, low cost, high production yield, stable temperature performance, low sensitivity and the like. The optical lens can be well matched with an on-vehicle visible light (RGB) chip and an Infrared (IR) chip, so that visible light and infrared confocal imaging is realized, and day and night dual-purpose imaging is realized. In addition, through reasonable matching of curvature, spacing and back focus, ghost images of the optical lens can be eliminated.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting 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; and

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

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail 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 first lens may have a negative power. The first lens may have a convex-concave type. The first lens is in a meniscus shape protruding towards the object side, which is beneficial to reducing the incident angle of incident light on the attack surface, so that the light can correctly and stably enter the optical lens, and the resolution of the optical lens is improved. In addition, light can be diffused, so that the trend of the light is in stable transition, and meanwhile, the light with a large angle enters the optical lens as far as possible, so that the illumination is improved, and the higher imaging quality is realized.

In an exemplary embodiment, the second lens may have a positive optical power. The second lens may have a meniscus type. The second lens is concave-convex and has positive focal power, so that more light rays can be collected to enter the image side direction of the second lens to increase the luminous flux, the light rays can be adjusted, the chromatic aberration can be reduced, the total length can be reduced, the light rays can be collected to enable the trend of the light rays to be in stable transition, and meanwhile, the light rays with large angles can enter the image side direction as far as possible to improve the illumination. The second lens is an aspheric lens, which can further improve the resolution quality.

In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex-concave type. The third lens has positive focal power, is beneficial to converging light rays and compressing the angle of incident light rays so as to realize light ray smooth transition, and is also beneficial to reducing the aperture of the lens in the image side direction. Illustratively, the material of the third lens is a high-refractive-index and low-abbe-number material, which can compensate the on-axis aberration of the optical lens, thereby improving the imaging quality.

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 concavo-convex type or a concave-concave type.

In an exemplary embodiment, the sixth lens may have a positive optical power. The sixth lens may have a convex concave type or a convex type. The sixth lens has positive focal power, can amplify light rays passing through the fourth lens and the fifth lens to an imaging surface, and is also favorable for reducing the total length of the optical lens. Illustratively, the sixth lens is an aspherical lens, which can correct astigmatism and curvature of field and improve resolution.

In an exemplary embodiment, an optical lens according to the present application may satisfy TTL/H/FOV ≦ 0.04, where TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging surface of the optical lens, FOV is a maximum angle of view of the optical lens, and H is an image height corresponding to the maximum angle of view FOV of the optical lens. The optical lens meets the condition that TTL/H/FOV is less than or equal to 0.04, the length of the optical lens can be effectively limited under the condition of the same imaging surface and the same image height, and the miniaturization is favorably realized. More specifically, TTL, H, and FOV may satisfy: TTL/H/FOV is less than or equal to 0.03.

In an exemplary embodiment, an optical lens according to the present application may satisfy 1 ≦ R1/R2 ≦ 10, where R1 is a central radius of curvature of an object-side surface of the first lens, and R2 is a central radius of curvature of an image-side surface of the first lens. The optical lens satisfies that R1/R2 is more than or equal to 1 and less than or equal to 10, the shape of the first lens can be controlled, light rays with larger angles can be collected to enter the optical lens, the diameter of an object side port of the optical lens is favorably reduced, and in addition, the miniaturization is realized while the resolution is improved. More specifically, R1 and R2 satisfy: 2 is less than or equal to R1 and R2 is less than or equal to 7.

In an exemplary embodiment, an optical lens according to the present application may satisfy D/H/FOV ≦ 0.02, where D is a maximum clear aperture of an object-side surface of the first lens corresponding to a maximum angle of view of the optical lens, H is an image height corresponding to the maximum angle of view of the optical lens, and FOV is the maximum angle of view of the optical lens. The optical lens meets the requirement that D/H/FOV is less than or equal to 0.02, and is beneficial to reducing the object side end caliber of the optical lens and realizing miniaturization. More specifically, D, H and the FOV satisfy: D/H/FOV is less than or equal to 0.015.

In an exemplary embodiment, an optical lens according to the present application may satisfy BFL/TTL ≧ 0.1, where TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical lens, and BFL is a distance on the optical axis from an image-side surface of the sixth lens element to the imaging surface of the optical lens. The optical lens meets the condition that BFL/TTL is more than or equal to 0.1, and the back focus is longer on the basis of realizing miniaturization. The optical lens is beneficial to the assembly of the module. More specifically, TTL and BFL satisfy: BFL/TTL is more than or equal to 0.12.

In an exemplary embodiment, an optical lens according to the present application may satisfy | F4/F5| ≦ 2, where F4 is an effective focal length of the fourth lens and F5 is an effective focal length of the fifth lens. The optical lens meets the condition that | F4/F5| is less than or equal to 2, so that the focal lengths of the two lenses are close, and the light is smooth and excessive. Illustratively, when the fourth lens and the fifth lens are cemented, it is beneficial to correct chromatic aberration, improve image quality and effectively improve thermal compensation of the optical lens. More specifically, F4 and F5 satisfy: the ratio of F4 to F5 is less than or equal to 1.5.

In an exemplary embodiment, the optical lens according to the present application may satisfy (FOV × F)/H ≧ 40, where FOV is a maximum angle of view of the optical lens, F is a total effective focal length of the optical lens, and H is an image height corresponding to the maximum angle of view of the optical lens. The optical lens meets the condition that (FOV multiplied by F)/H is more than or equal to 40, has the characteristic of large field angle and has the characteristic of long focus. More specifically, FOV, F and H satisfy: (FOV F)/H.gtoreq.45.

In an exemplary embodiment, an optical lens according to the present application may satisfy | R8/R9| ≧ 1.5, where R8 is a central radius of curvature of an object-side surface of the fourth lens and R9 is a central radius of curvature of an object-side surface of the fifth lens. The optical lens meets the condition that R8/R9 is more than or equal to 1.5, the central curvature radius of the fifth lens can be configured, so that the light rays collected by the fourth lens can be compressed, the trend of the light rays is relatively gentle, and the light rays are enabled to be smoothly transited to the image side direction. The optical lens also has smaller aberration and higher imaging quality. If the value is less than the lower limit of the conditional expression, the incident angle of the light beam incident on the object-side surface of the fifth lens increases, and the relative illuminance of the optical lens decreases. Therefore, the optical lens can obtain a bright image with high image quality by satisfying this conditional expression. More specifically, R8 and R9 satisfy: the | R8/R9| ≧ 1.8.

In an exemplary embodiment, an optical lens according to the present application may satisfy d7/TTL ≦ 0.1, where d7 is a distance between the third lens and the fourth lens on the optical axis, and TTL is a distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis. The optical lens meets the condition that d7/TTL is less than or equal to 0.1, and the distance between the third lens and the fourth lens is smaller. The image quality of the optical lens is improved. More specifically, d7 satisfies with TTL: d7/TTL is less than or equal to 0.05.

In an exemplary embodiment, an optical lens according to the present application may satisfy | F/R1| ≧ 0.5, where F is the total effective focal length of the optical lens and R1 is the central radius of curvature of the object-side surface of the first lens. The optical lens satisfies | F/R1| ≧ 0.5, which is helpful for making the change of the refraction angle of the incident light more moderate, so as to avoid too much aberration generated by too strong refraction change, and is beneficial to the manufacture of the first lens, and simultaneously, the tolerance sensitivity can be reduced. More specifically, F and R1 satisfy: and the | F/R1| is more than or equal to 0.6.

In an exemplary embodiment, an optical lens according to the present application may satisfy TTL/F ≦ 7, where TTL is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the optical lens, and F is a total effective focal length of the optical lens. The optical lens meets the condition that TTL/F is less than or equal to 7, the total optical length can be effectively limited, and miniaturization is further realized. More specifically, TTL and F satisfy: TTL/F is less than or equal to 6.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy | F/R3| + | F/R4| ≦ 2.5, where F is the total effective focal length of the optical lens, R3 is the center radius of curvature of the object-side surface of the second lens, and R4 is the center radius of curvature of the image-side surface of the second lens. The optical lens meets the condition that F/R3| + | F/R4| < 2.5, can assist the incident light at the second lens to enter the optical lens, and effectively corrects astigmatism to improve the imaging quality. More specifically, F, R3 and R4 satisfy: the | + | F/R3| + | F/R4| < 2.

In an exemplary embodiment, an optical lens according to the present application may satisfy 0.1 ≦ (d7 × BFL)/(d7+ BFL) ≦ 0.7, where d7 is a separation distance of the third lens and the fourth lens on the optical axis, and BFL is a distance from an image-side surface of the sixth lens to an image plane of the optical lens on the optical axis. The optical lens meets the requirement that (d7 xBFL)/(d 7+ BFL) is less than or equal to 0.7 and is more than or equal to 0.1, the proportion of the back focal length to the distance between the third lens and the fourth lens is balanced, the assembly yield can be increased, and meanwhile, the optical lens is enabled to be provided with enough back focal length to place other optical elements to increase the design elasticity. More specifically, d7 satisfies with BFL: the (d7 xBFL)/(d 7+ BFL) is more than or equal to 0.15 and less than or equal to 0.55.

In an exemplary embodiment, an optical lens according to the present application may satisfy F/ENPD ≦ 2.5, where F is the total effective focal length of the optical lens and ENPD is the entrance pupil diameter of the optical lens. The optical lens meets the condition that F/ENPD is less than or equal to 2.5, and can have small FNO, thereby being beneficial to increasing the light transmission quantity. In addition, the entrance pupil diameter is large, which is beneficial to improving the relative illumination. More specifically, F and ENPD satisfy: F/ENPD is less than or equal to 2.2.

In an exemplary embodiment, an optical lens according to the present application may satisfy-1.2 ≦ (R6-R7)/(R6+ R7) ≦ -0.2, where R6 is a central radius of curvature of the object-side surface of the third lens and R7 is a central radius of curvature of the image-side surface of the third lens. The optical lens meets the condition that (R6-R7)/(R6+ R7) is less than or equal to-1.2 and less than or equal to-0.2, aberration can be corrected, and light rays entering the third lens and emergent light rays are ensured to be gentle, so that tolerance sensitivity of the optical lens is reduced. More specifically, R6 and R7 satisfy: the ratio of (R6-R7)/(R6+ R7) is more than or equal to-1 and less than or equal to-0.3.

In an exemplary embodiment, an optical lens according to the present application may satisfy R1/(R2+ d1) ≦ 1.1, where R1 is a central radius of curvature of an object-side surface of the first lens, R2 is a central radius of curvature of an image-side surface of the first lens, and d1 is a separation distance of the first lens and the second lens on an optical axis. The optical lens meets the condition that R1/(R2+ d1) is less than or equal to 1.1, the shape of the first lens can be set, so that optical path difference exists between peripheral light rays and central light rays, then the central light rays can divergently enter an image-side defense line of the first lens, the caliber of an object-side end of the optical lens is favorably reduced, the size is reduced, and the miniaturization and the cost reduction of the optical lens are favorably realized. More specifically, R1, R2, and d1 satisfy: R1/(R2+ d1) is less than or equal to 1.

In an exemplary embodiment, an optical lens according to the present application may satisfy 2 ≦ F6/F ≦ 3, where F6 is an effective focal length of the sixth lens and F is a total effective focal length of the optical lens. The optical lens meets the condition that | F6/F | is less than or equal to 2 and less than or equal to 3, and the sixth lens has a short focal length, so that the light collection is facilitated and the light transmission quantity is ensured. More specifically, F6 and F satisfy: the absolute value of F6/F is more than or equal to 2 and less than or equal to 2.8.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the second lens and the third lens to further improve the imaging quality of the optical lens. The arrangement of the diaphragm is favorable for effectively converging the light rays entering the optical lens, so that the lens aperture at the image side end of the optical lens is reduced, and the assembly sensitivity of the optical lens is reduced. In the embodiment of the present application, the stop may be disposed in the vicinity of the image side surface of the second lens or in the vicinity of the object side surface of the third 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, for example, between the third lens and the fourth lens, according to actual needs.

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

In an exemplary embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens. Cemented lenses can 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. The fourth lens with the convex object side surface and the convex image side surface is glued with the fifth lens with the concave object side surface, so that light rays emitted by the third lens can be smoothly transited to an imaging surface, the total length of the optical lens is reduced, various aberrations of the optical lens can be corrected, and the optical performance of the optical lens, such as resolution, distortion optimization, CRA (cross-correlation search algorithm) and the like, can be improved on the premise of compact structure of the optical lens.

The gluing mode adopted between the fourth lens and the fifth lens also has at least one of the following advantages: reducing the air space between the two lenses, thereby reducing the overall length of the system; the assembling parts between 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 curvature of field and effectively correcting the off-axis point aberration of the optical lens. Illustratively, the fourth lens and the fifth lens are aspheric lenses, which can further improve the resolution quality.

Illustratively, at least one of the first lens, the second lens, the fourth lens, the fifth lens, and the sixth lens has an aspherical mirror surface.

In an exemplary embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may each have an aspherical mirror surface.

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 better curvature radius characteristics, 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.

The optical lens according to the above-described embodiment of the present application achieves at least one advantageous effect that the optical system has a large field of view, high resolution, dual-purpose use for day and night, and the like, in the case of using only six lenses, by appropriate setting of each lens shape and optical power. Meanwhile, the optical system also meets the requirements of small caliber of an object side end, small volume, low sensitivity, high production yield and low cost. Meanwhile, the optical lens has the advantages of good temperature adaptability, small change of imaging effect in high and low temperature environments, stable image quality and contribution to accurate distance measurement of the binocular lens.

In an exemplary embodiment, 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 element L2 is a meniscus lens element with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a convex-concave lens with positive power, and has a convex object-side surface S6 and a concave image-side surface S7. 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 refractive power, and 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.

The optical lens may further include a stop STO, which may be disposed between the second lens L2 and the third lens L3 to improve image quality. For example, the stop STO may be disposed near the object side S6 of the third lens L3.

Illustratively, the optical lens may further include an auxiliary lens L7 having no optical power, which has an object side surface S13 and an image side surface S14. Alternatively, the auxiliary lens L7 may be an optical filter or a protective glass. Filters may be used to correct for color deviations. The protective glass may be used to protect the image sensing chip IMA located at the imaging plane S15. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

Table 1 shows a center radius of curvature R, a thickness T (it is understood that the thickness T of the row of S1 is the center thickness T1 of the first lens L1, the thickness T of the row of S2 is the air interval d1 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 S1 of the first lens L1 to the image-side surface S4 of the second lens and the object-side surface S8 of the fourth lens L4 to the image-side surface S12 of the sixth lens may be aspheric surfaces, and the surface type x of each aspheric surface lens can be defined by, but is not limited to, the following aspheric surface 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 aspheric surface. The conical coefficient k and the higher-order term coefficients A4, A6, A8, A10, A12, A14 and A16 which can be used for the respective aspherical mirror surfaces S1 to S12 in example 1 are given in the following tables 2-1 and 2-2.

Flour mark	S1	S2	S3	S4	S8	S9	S10	S11	S12
										k	-0.4268	-0.6034	-0.7610	-0.2846	-0.0444	-1.4238	-50.8295	-3.7760	-40.5907

TABLE 2-1

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.7482E-03

-1.3376E-03

-4.7207E-05

8.1243E-06

-1.8880E-07

0

S2

1.6779E-02

-4.5439E-03

-4.8639E-04

-6.7872E-04

5.7583E-05

0

S3

1.5156E-02

-5.1073E-03

6.0899E-04

1.0545E-05

-3.8051E-05

-1.0858E-04

5.1904E-05

S4

1.2343E-02

-6.8665E-03

4.9041E-03

-6.8587E-04

-1.6395E-03

8.9481E-04

-1.1025E-04

S8

3.6599E-03

-1.0588E-03

3.7000E-04

-1.9645E-04

1.5793E-05

8.5940E-06

-1.5474E-06

S9

-3.9805E-02

9.1519E-03

-6.3557E-03

3.2726E-03

-3.5755E-04

-7.7584E-05

1.3819E-05

S10

-1.0880E-02

5.2354E-03

-5.9786E-04

9.9019E-05

3.5875E-06

-5.0795E-06

4.6695E-07

S11

-7.5452E-03

1.8375E-03

-3.3380E-04

4.9266E-05

-2.9756E-06

-2.7262E-08

8.5916E-09

S12

6.6037E-03

-2.0531E-03

2.4989E-04

-2.5068E-05

1.9204E-06

7.4732E-09

-2.2270E-09

Tables 2 to 2

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. Fig. 2 shows a schematic structural 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 central radius of curvature R, thickness 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	S1	S2	S3	S4	S8	S9	S10	S11	S12
										k	-0.4268	-0.6034	-0.7710	-0.2846	-0.0444	-1.4238	100.8295	-3.5760	-40.5907

TABLE 4-1

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.7482E-03

-1.3376E-03

-4.7207E-05

8.1243E-06

-1.8880E-07

0

S2

1.6779E-02

-4.5439E-03

-4.8639E-04

-6.7872E-04

5.7583E-05

0

S3

1.5156E-02

-5.1073E-03

6.0899E-04

1.0545E-05

-3.8051E-05

-1.0858E-04

5.1904E-05

S4

1.2343E-02

-6.8665E-03

4.9041E-03

-6.8587E-04

-1.6395E-03

8.9481E-04

-1.1025E-04

S8

3.6599E-03

-1.0588E-03

3.7000E-04

-1.9645E-04

1.5793E-05

8.5940E-06

-1.5474E-06

S9

-3.9805E-02

9.1519E-03

-6.3557E-03

3.2726E-03

-3.5755E-04

-7.7584E-05

1.3819E-05

S10

-1.0880E-02

5.2354E-03

-5.9786E-04

9.9019E-05

3.5875E-06

-5.0795E-06

4.6695E-07

S11

-7.5452E-03

1.8375E-03

-3.3380E-04

4.9266E-05

-2.9756E-06

-2.7262E-08

8.5916E-09

S12

6.6037E-03

-2.0531E-03

2.4989E-04

-2.5068E-05

1.9204E-06

7.4732E-09

-2.2270E-09

TABLE 4-2

Example 3

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

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 element L2 is a meniscus lens element with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a convex-concave lens with positive power, and has a convex object-side surface S6 and a concave image-side surface S7. 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 convex-concave lens element with positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 5 shows the central radius of curvature R, thickness 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	S1	S2	S3	S4	S8	S9	S10	S11	S12
										k	-0.4480	-0.5836	-0.6099	0.3881	-0.2946	-1.8479	-175.0187	-5.4758	-43.8765

TABLE 6-1

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.5414E-03

-1.3543E-03

-4.6053E-05

8.3818E-06

-2.0941E-07

0

S2

1.8723E-02

-4.2211E-03

-3.5569E-04

-6.8907E-04

5.9588E-05

0

S3

1.5156E-02

-4.4935E-03

7.6928E-04

-3.9359E-05

-3.7188E-05

-1.0642E-04

3.8029E-05

S4

1.2343E-02

-7.7280E-03

5.2428E-03

-5.4640E-04

-1.6501E-03

8.5942E-04

-1.2308E-04

S8

2.5403E-03

-8.9261E-04

4.0483E-04

-1.9495E-04

1.4409E-05

8.5275E-06

-1.4488E-06

S9

-3.9751E-02

8.4653E-03

-6.3778E-03

3.2712E-03

-3.6661E-04

-7.9196E-05

1.4113E-05

S10

-1.0456E-02

5.2887E-03

-6.0490E-04

9.6173E-05

3.2753E-06

-5.0654E-06

4.8960E-07

S11

-7.3189E-03

1.8039E-03

-3.3782E-04

4.8988E-05

-2.9740E-06

-3.0438E-08

7.9355E-09

S12

5.3994E-03

-2.0414E-03

2.4842E-04

-2.5623E-05

1.8376E-06

-3.5461E-09

-3.3993E-09

TABLE 6-2

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.

Table 7 shows the central radius of curvature R, thickness 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

TABLE 8-1

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.5414E-03

-1.3543E-03

-4.6053E-05

8.3818E-06

-2.0941E-07

0

S2

1.8723E-02

-4.2211E-03

-3.5569E-04

-6.8907E-04

5.9588E-05

0

S3

1.5156E-02

-4.4935E-03

7.6928E-04

-3.9359E-05

-3.7188E-05

-1.0642E-04

3.8029E-05

S4

1.2343E-02

-7.7280E-03

5.2428E-03

-5.4640E-04

-1.6501E-03

8.5942E-04

-1.2308E-04

S8

2.5403E-03

-8.9261E-04

4.0483E-04

-1.9495E-04

1.4409E-05

8.5275E-06

-1.4488E-06

S9

-3.9751E-02

8.4653E-03

-6.3778E-03

3.2712E-03

-3.6661E-04

-7.9196E-05

1.4113E-05

S10

-1.0456E-02

5.2887E-03

-6.0490E-04

9.6173E-05

3.2753E-06

-5.0654E-06

4.8960E-07

S11

-7.3189E-03

1.8039E-03

-3.3782E-04

4.8988E-05

-2.9740E-06

-3.0438E-08

7.9355E-09

S12

5.3994E-03

-2.0414E-03

2.4842E-04

-2.5623E-05

1.8376E-06

-3.5461E-09

-3.3993E-09

TABLE 8-2

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 includes, in order from an object side to an image side, 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 element L2 is a meniscus lens element with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a convex-concave lens with positive power, and has a convex object-side surface S6 and a concave image-side surface S7. 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 refractive power, and 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.

The optical lens may further include a stop STO, which may be disposed between the second lens L2 and the third lens L3 to improve image quality. For example, the stop STO may be disposed near the image side S4 of the second lens L2.

Table 9 shows the central radius of curvature R, thickness T, 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	S1	S2	S3	S4	S8	S9	S10	S11	S12
										k	-0.4478	-0.5825	-0.8372	0.2373	-0.2886	-1.8470	60.1076	-5.0402	-200.6289

TABLE 10-1

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.5601E-03

-1.3407E-03

-4.6001E-05

8.3347E-06

-2.1012E-07

0

S2

1.8820E-02

-4.0769E-03

-3.3461E-04

-6.7517E-04

5.7675E-05

0

S3

1.5156E-02

-4.4131E-03

7.0566E-04

-2.9291E-05

-3.2019E-05

-1.0678E-04

3.8345E-05

S4

1.2343E-02

-7.4565E-03

5.0571E-03

-5.0542E-04

-1.6353E-03

8.4961E-04

-1.2114E-04

S8

2.6337E-03

-9.6381E-04

4.0111E-04

-1.9712E-04

1.4521E-05

8.4858E-06

-1.4571E-06

S9

-3.8638E-02

8.6709E-03

-6.4106E-03

3.2533E-03

-3.6326E-04

-7.8047E-05

1.3966E-05

S10

-1.0320E-02

5.2561E-03

-6.0485E-04

9.6597E-05

3.1771E-06

-5.0969E-06

4.8096E-07

S11

-7.7762E-03

1.8009E-03

-3.3611E-04

4.9168E-05

-2.9873E-06

-3.0688E-08

7.7897E-09

S12

5.4129E-03

-2.0625E-03

2.4613E-04

-2.5773E-05

1.8337E-06

-1.1608E-09

-2.9337E-09

TABLE 10-2

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.

Table 11 shows the central radius of curvature R, thickness 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

Flour mark	S1	S2	S3	S4	S8	S9	S10	S11	S12
										k	-0.4463	-0.5817	-0.8834	0.2402	-0.3245	-1.6514	16.7746	-4.9672	30.3910

TABLE 12-1

TABLE 12-2

Example 7

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

As shown in fig. 7, the optical lens 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 element L2 is a meniscus lens element with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a convex-concave lens with positive power, and has a convex object-side surface S6 and a concave image-side surface S7. 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 convex-concave lens element with positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Illustratively, the optical lens may further include an auxiliary lens L7 having no optical power, which has an object side surface S13 and an image side surface S14. Alternatively, the auxiliary lens L7 may be an optical filter or a protective glass. Filters may be used to correct for color deviations. The protective glass may be used to protect the image sensing chip IMA located at the imaging plane S15. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 13 shows the central radius of curvature R, thickness 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	S1	S2	S3	S4	S8	S9	S10	S11	S12
										k	-0.4604	-0.5920	-1.2567	-0.1843	-0.1678	-2.3211	75.3264	-3.5273	67.8607

TABLE 14-1

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.1475E-03

-1.3507E-03

-4.7632E-05

8.4056E-06

-1.2409E-07

0

S2

1.6947E-02

-4.1812E-03

-4.8335E-04

-6.3927E-04

8.4288E-05

0

S3

1.5156E-02

-4.4664E-03

1.0987E-03

1.8893E-05

-2.6440E-06

-9.7898E-05

4.0384E-05

S4

1.2343E-02

-7.3264E-03

5.1805E-03

-6.5409E-04

-1.6265E-03

8.9696E-04

-1.2183E-04

S8

2.9606E-03

-6.7484E-04

3.9729E-04

-2.0173E-04

1.3172E-05

8.5433E-06

-1.3243E-06

S9

-3.7260E-02

9.3311E-03

-6.1696E-03

3.2743E-03

-3.7573E-04

-8.1158E-05

1.4349E-05

S10

-1.2256E-02

5.2111E-03

-6.4241E-04

8.9737E-05

2.6651E-06

-5.1595E-06

4.3670E-07

S11

-3.9813E-03

2.0372E-03

-3.0970E-04

5.1591E-05

-2.8230E-06

-2.9955E-08

6.9510E-09

S12

1.2650E-02

-2.4205E-03

3.4647E-04

-1.8442E-05

2.5086E-06

1.1808E-07

2.2869E-08

TABLE 14-2

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.

Table 15 shows the central radius of curvature R, thickness 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	S1	S2	S3	S4	S8	S9	S10	S11	S12
										k	-0.4594	-0.5922	-1.2563	-0.1969	-0.1757	-2.2340	75.3206	-3.6241	62.9237

TABLE 16-1

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.1464E-03

-1.3492E-03

-4.7462E-05

8.4175E-06

-1.2380E-07

0

S2

1.7025E-02

-4.2012E-03

-4.9187E-04

-6.4126E-04

8.3929E-05

0

S3

1.5156E-02

-4.4162E-03

1.1176E-03

2.0580E-05

-8.7116E-06

-9.9352E-05

3.9579E-05

S4

1.2343E-02

-7.3239E-03

5.1734E-03

-6.5953E-04

-1.6290E-03

8.9631E-04

-1.2171E-04

S8

2.9292E-03

-6.8208E-04

3.9548E-04

-2.0211E-04

1.3114E-05

8.5432E-06

-1.3197E-06

S9

-3.7744E-02

9.2632E-03

-6.1817E-03

3.2721E-03

-3.7607E-04

-8.1175E-05

1.4367E-05

S10

-1.2217E-02

5.2138E-03

-6.4233E-04

8.9669E-05

2.6332E-06

-5.1706E-06

4.3315E-07

S11

-4.0483E-03

2.0363E-03

-3.0973E-04

5.1590E-05

-2.8227E-06

-3.0005E-08

6.8954E-09

S12

1.2599E-02

-2.4587E-03

3.4279E-04

-1.8894E-05

2.4387E-06

1.0534E-07

2.0327E-08

TABLE 16-2

In summary, 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, units of TTL, BFL, F, H, D, ENPD, F1, F2, F3, F4, F5, F6 are millimeters (mm), and units of FOV are 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 embodiments of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. Illustratively, the electronic device includes an imaging element disposed on an imaging surface of the optical lens. Alternatively, the imaging element provided on the imaging plane may be a photo-coupled device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS).

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 foregoing description is only exemplary of the preferred embodiments 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;

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

a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;

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

a fifth lens element having a negative refractive power, the object-side surface of which is concave; and

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

2. An optical lens barrel according to claim 1, wherein the image side surface of the fifth lens element is concave.

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

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

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

6. An optical lens according to claim 1, characterized in that the fourth lens and the fifth lens are cemented to form a cemented lens.

7. An optical lens according to claim 1, wherein at least one of the first lens, the second lens, the fourth lens, the fifth lens, and the sixth lens has an aspherical mirror surface.

8. An optical lens according to any one of claims 1 to 7, characterized in that the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy: the absolute value of F6/F is more than or equal to 2 and less than or equal to 3.

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;

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;

wherein, a distance TTL between an object side surface of the first lens element and 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 the maximum field angle FOV of the optical lens satisfy: TTL/H/FOV is less than or equal to 0.04.

10. An electronic apparatus characterized by comprising the optical lens according to claim 1 or 9 and an imaging element for converting an optical image formed by the optical lens into an electric signal.