CN114488467A

CN114488467A - Optical lens and electronic device

Info

Publication number: CN114488467A
Application number: CN202011263453.5A
Authority: CN
Inventors: 马奥林; 王东方; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2022-05-13

Abstract

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

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

In recent years, with the rapid development of automobile driving assistance systems, an on-board lens plays an important role in the driving assistance system as a main tool for the driving assistance system to acquire external information. For safety reasons, the onboard lens should be able to collect a greater range of information in the surrounding environment. In addition, in order to obtain information more accurately, the assistant driving system needs to be matched with a chip with a larger size and a higher resolution, and therefore, the optical lens is used as a main tool for obtaining external information by the assistant driving system and needs to have higher resolution.

In addition, because the vehicle-mounted lens in the current market has certain disadvantages in terms of thermal performance, such as blurred imaging effect in high and low temperature environments, the vehicle-mounted lens also needs to have higher imaging stability to adapt to various severe environments, and the risk of obvious reduction of the imaging performance of the lens caused by large temperature difference is avoided.

Disclosure of Invention

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

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

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

In one embodiment, at least two of the second lens, the fourth lens, the fifth lens, and the sixth lens have aspherical mirror surfaces.

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, a maximum half field angle FOV of the optical lens, and a half image height H corresponding to the maximum field angle of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.15.

In one embodiment, the maximum half field angle FOV of the optical lens, the maximum clear half aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the half image height H corresponding to the maximum field angle of the optical lens may satisfy: D/H/FOV is less than or equal to 0.1.

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 0.1.

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 F5/F4 is more than or equal to 0.5 and less than or equal to 2.

In one embodiment, the effective focal length F1 of the first lens and the effective focal length F2 of the second lens may satisfy: and the | F1/F2| is more than or equal to 1.5.

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 ratio of F3/F is less than or equal to 5.

In one embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens may satisfy: the ratio of F5/F is less than or equal to 2.5.

In one embodiment, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens may satisfy: and | F6/F | ≧ 2.

In one embodiment, the radius of curvature R11 of the object-side surface of the first lens, the radius of curvature R12 of the image-side surface of the first lens, and the distance d1 from the center of the object-side surface of the first lens to the center of the image-side surface of the first lens may satisfy: R11/(R12+ d1) ≥ 1.5.

In one embodiment, the radius of curvature R31 of the object-side surface of the third lens and the radius of curvature R32 of the image-side surface of the third lens may satisfy: the absolute value of R31/R32 is more than or equal to 0.5 and less than or equal to 2.5.

In one embodiment, a distance d3 between the center of the object-side surface of the third lens and the center of the image-side surface of the third lens 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 can satisfy: d3/TTL is less than or equal to 0.25.

In one embodiment, the distance SAG41 from the maximum clear half-aperture D41 of the object-side surface of the fourth lens corresponding to the maximum field angle of the optical lens to the optical axis from the intersection point of the object-side surface of the fourth lens and the optical axis to the maximum clear aperture of the object-side surface of the fourth lens may satisfy: SAG41/D41 is less than or equal to 0.15.

In one embodiment, the maximum clear half aperture D41 of the object-side surface of the fourth lens corresponding to the maximum field angle of the optical lens, the curvature radius R41 of the object-side surface of the fourth lens, and the distance SAG41 on the optical axis from the intersection point of the object-side surface of the fourth lens and the optical axis to the maximum clear aperture of the object-side surface of the fourth lens may satisfy: arctan (D41/(R41-SAG41)) > 0.05.

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 negative optical power; a fifth lens having a positive optical power; and a sixth lens having positive optical power; the radius of curvature R31 of the object-side surface of the third lens and the radius of curvature R32 of the image-side surface of the third lens satisfy: the absolute value of R31/R32 is more than or equal to 0.5 and less than or equal to 2.5.

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

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

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

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.

The optical lens has the advantages that the six lenses are adopted, the shape, focal power and the like of each lens are optimally set, and the optical lens has at least one beneficial effect of large field angle, miniaturization, low cost, large aperture, high resolution, longer back focus, good thermal performance and the like.

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; and

FIG. 9 is a schematic diagram illustrating the rise of the object-side surface of a lens according to 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 object space light can be prevented from being excessively diffused, the aperture of the rear lens can be controlled, and the miniaturization design is realized. The first lens is designed into a meniscus shape, so that light rays with a large field of view can be collected as far as possible and enter a rear optical system, and the light flux is increased. The object side surface of the first lens is designed to be a convex surface, so that water drops can slide off in actual use environments such as rain and snow weather, and the influence of the actual use environments on imaging is reduced. Preferably, the first lens can use a high-refractive-index material (such as Nd1 ≧ 1.7), which is beneficial for reducing the front-end aperture and improving the imaging quality. Preferably, the first lens is made of a material with higher hardness.

In an exemplary embodiment, the second lens may have a negative power. The second lens may have a convex concave type or a concave type. The second lens has negative focal power, which is beneficial to further diverging the light rays passing through the first lens. The second lens is of a convex concave surface type or a concave surface type, and light can be smoothly transited to a rear optical system. Preferably, the second lens may have an aspherical mirror surface, which may improve lens resolution.

In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex type. The third lens has positive focal power, is favorable for converging light, reducing the front end caliber and improving the imaging quality. Preferably, the third lens can use a high refractive index material (e.g., Nd3 ≧ 1.7). Preferably, the third lens may have an aspherical mirror surface, which may improve lens resolution.

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

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

In an exemplary embodiment, the sixth lens may have a positive optical power. The sixth lens may have a convex type or a convex concave type. The arrangement of the focal power and the surface type of the sixth lens is beneficial to converging light on an imaging surface and improving the imaging quality. Preferably, the sixth lens may have an aspherical mirror surface to further improve the resolution quality and correct aberrations.

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 0.15, 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 half field angle of the optical lens, and H is the half image height corresponding to the maximum field angle of the optical lens. More specifically, TTL, H, and FOV further satisfy: TTL/H/FOV is less than or equal to 0.1. The TTL/H/FOV is less than or equal to 0.15, the miniaturization is favorably realized, and the size of the optical lens is favorably smaller under the condition that the imaging surface and the image height of the optical lens are fixed.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.1, wherein FOV is the maximum half field angle of the optical lens, D is the maximum clear half aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and H is the half image height corresponding to the maximum field angle of the optical lens. More specifically, D, H and the FOV further satisfy: D/H/FOV is less than or equal to 0.05. Satisfies the requirement that D/H/FOV is less than or equal to 0.1, and is beneficial to reducing the caliber of the front end.

In an exemplary embodiment, an optical lens according to the present application may satisfy: BFL/TL is more than or equal to 0.1, 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, TL may further satisfy: BFL/TL is more than or equal to 0.15. The BFL/TL ratio is more than or equal to 0.1, 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 | F5/F4| is less than or equal to 0.5 and less than or equal to 2, wherein F4 is the effective focal length of the fourth lens, and F5 is the effective focal length of the fifth lens. More specifically, F5 and F4 may further satisfy: the absolute value of F5/F4 is more than or equal to 0.7 and less than or equal to 1.5. The condition that the absolute value of F5/F4 is less than or equal to 2 is met, light is smoothly transited, and chromatic aberration is corrected.

In an exemplary embodiment, an optical lens according to the present application may satisfy: i F1/F2| ≧ 1.5, where F1 is the effective focal length of the first lens and F2 is the effective focal length of the second lens. More specifically, F1 and F2 may further satisfy: and the | F1/F2| is more than or equal to 1.6. The requirement that the absolute value of F1/F2 is more than or equal to 1.5 is met, and the thermal performance is favorably improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F | ≦ 5, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens. More specifically, F3 and F further satisfy: the ratio of F3/F is less than or equal to 4. Satisfying | F3/F | ≦ 5, which is helpful for improving resolution.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F5/F | ≦ 2.5, wherein F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens. More specifically, F5 and F further satisfy: the ratio of F5/F is less than or equal to 2. Satisfies the condition that F5/F is less than or equal to 2.5, and is beneficial to improving the thermal performance.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F6/F | ≧ 2, wherein F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens. More specifically, F6 and F further satisfy: and the ratio of F6/F is more than or equal to 3. The condition that | F6/F | ≧ 2 is met, and the resolution is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R11/(R12+ d1) ≧ 1.5, where R11 is the radius of curvature of the object-side face of the first lens, R12 is the radius of curvature of the image-side face of the first lens, and d1 is the distance from the center of the object-side face of the first lens to the center of the image-side face of the first lens. More specifically, R11, R12, and d1 may further satisfy: R11/(R12+ d1) ≥ 1.8. The requirement of R11/(R12+ d1) is more than or equal to 1.5, which is beneficial to increasing the field angle of the lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.5 ≦ R31/R32 ≦ 2.5, where R31 is the radius of curvature of the object-side surface of the third lens and R32 is the radius of curvature of the image-side surface of the third lens. More specifically, R31 and R32 may further satisfy: the absolute value of R31/R32 is more than or equal to 0.8 and less than or equal to 2. The requirement that the absolute value of R31/R32 is less than or equal to 0.5 is met, the light is smoothly transited, and the sensitivity of the lens is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and d3/TTL is less than or equal to 0.25, wherein d3 is the distance from the center of the object side surface of the third lens to the center of the image side surface of the third lens, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, d3 and TTL further satisfy: d3/TTL is less than or equal to 0.2. D3/TTL is less than or equal to 0.25, so that the total lens length is shortened and the cost is reduced.

Fig. 9 shows a schematic diagram of the rise SAG of the object side S of the lens L of the present application. D is a half aperture of the maximum clear aperture of the object-side surface S of the lens L corresponding to the maximum field angle of the optical lens, and the rise SAG is a distance a on the optical axis from the intersection point a of the object-side surface S of the lens L and the optical axis to the maximum clear aperture of the object-side surface S of the lens L.

In an exemplary embodiment, an optical lens according to the present application may satisfy: SAG41/D41 is less than or equal to 0.15, wherein D41 is the maximum light-passing half aperture of the object side surface of the fourth lens corresponding to the maximum field angle of the optical lens, and SAG41 is the distance from the intersection point of the object side surface of the fourth lens and the optical axis to the maximum light-passing aperture of the object side surface of the fourth lens on the optical axis. More specifically, SAG41 and D41 further satisfy: SAG41/D41 is less than or equal to 0.1. Meets SAG41/D41 of less than or equal to 0.15, and is beneficial to improving thermal performance.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and arctan (D41/(R41-SAG41)) > 0.05, wherein D41 is the maximum clear half aperture of the object side surface of the fourth lens corresponding to the maximum field angle of the optical lens, R41 is the curvature radius of the object side surface of the fourth lens, and SAG41 is the distance on the optical axis from the intersection point of the object side surface of the fourth lens and the optical axis to the maximum clear aperture of the object side surface of the fourth lens. More specifically, D41, R41, and SAG41 may further satisfy: arctan (D41/(R41-SAG41)) > 0.08. Satisfying arctan (D41/(R41-SAG41)) > 0.05, is helpful for reducing ghost image.

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 the aperture of the diaphragm is increased, light rays entering the optical lens are effectively converged, the aperture of the lens is reduced, and miniaturization is realized. 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, reduce the problem of matching sensitivity 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 procedure 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 negative focal power, the convex object side surface and the concave image side surface is glued with the fifth lens with positive focal power, and the convex object side surface and the convex image side surface are both arranged on the fourth lens, so that the optical lens is compact in structure, the size of the optical lens is reduced, various aberrations of the optical lens are corrected, the total length of the optical lens is reduced, and the optical performances of the optical lens, such as resolution, distortion optimization, CRA (cross-correlation) and the like, are improved. 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; the spacing distance between the two lenses is reduced, so that the total length of the system is reduced, and the whole optical system is compact; 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; it is beneficial to eliminate the chromatic aberration or residual part of chromatic aberration to balance the chromatic aberration of the system. 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 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. 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 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.

According to the optical lens of the above embodiment of the present application, through reasonable setting of each lens shape and focal power, in the case of using only 6 lenses, at least one beneficial effect of the optical system, such as large field angle, miniaturization, low cost, large aperture, high resolution, long back focus, good thermal performance, and good imaging quality at high and low temperatures, is achieved. Meanwhile, the optical system also meets the requirements of small lens volume, low sensitivity and high production yield. The optical lens is also beneficial to reducing the caliber of the front end, shortening the total length, and improving the resolving power while ensuring the miniaturization of the lens. Meanwhile, the optical lens also has better temperature performance, is favorable for less change of the imaging effect of the optical lens in high and low temperature environments, has stable image quality, can be used in most environments, and can greatly improve the safety of automatic driving.

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 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 or a combination of plastic and glass. 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 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 L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens element with positive refractive power, and has a convex 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.

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 d12 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

102.0076

7.4076E-03

-1.3962E-03

1.3735E-04

-7.0061E-06

1.4873E-07

3.1988E-10

-1.6205E-12

S4

-0.8862

1.7230E-02

2.7573E-03

-1.4244E-03

1.9005E-04

9.3724E-07

8.1021E-08

-1.4949E-07

S8

-21.8052

-1.3273E-02

4.1344E-04

7.3253E-03

-5.3643E-03

8.2385E-04

0.0000E+00

S9

-1.0545

-1.0293E-01

3.4586E-02

-9.3294E-03

1.6380E-03

-1.8314E-04

0.0000E+00

S10

1.4279

9.9141E-03

-2.7044E-03

2.1513E-03

-1.4474E-04

2.2240E-05

0.0000E+00

S11

-21.5136

7.7691E-04

-3.6637E-03

9.3836E-04

5.1318E-05

-1.5038E-05

0.0000E+00

S12

92.4654

-3.3848E-03

-1.2470E-03

2.5719E-04

-1.4113E-05

8.0192E-06

0.0000E+00

TABLE 2

Example 2

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

As shown in fig. 2, the optical lens assembly includes, in order from an object side to an image side 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

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.

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 convex-concave lens with negative power, and has a convex 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 L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens element with positive refractive power, and has a convex 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 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

Flour mark

k

A4

A6

A8

A10

A12

S3

1.7894

1.7277E-03

-1.1618E-03

1.3086E-04

-6.8353E-06

1.3870E-07

S4

-2.8560

8.6823E-02

-2.0331E-02

3.0989E-03

-1.8930E-04

-4.7632E-07

S8

1.9463

-3.2782E-02

1.5750E-02

-8.8741E-03

2.7173E-03

-7.7644E-05

S9

-1.0815

-1.2527E-01

7.1960E-02

-2.4519E-02

4.0621E-03

1.5096E-05

S10

13.1745

-9.4626E-03

3.4573E-03

5.4428E-04

-2.0153E-05

-4.3730E-07

S11

1.3335

-1.7278E-02

1.6782E-03

1.6213E-04

-7.7936E-06

-1.8748E-06

S12

3.0214

1.1510E-02

-4.2298E-03

1.0698E-03

-1.3670E-04

1.6810E-05

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.

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

1.7949

1.7501E-03

-1.1617E-03

1.3086E-04

-6.8353E-06

1.3870E-07

S4

-2.8862

8.8803E-02

-2.0334E-02

3.0987E-03

-1.8941E-04

-4.7315E-07

S8

1.7576

-2.9920E-02

1.5600E-02

-8.9798E-03

2.7010E-03

8.2917E-05

S9

-1.0826

-1.3542E-01

7.1979E-02

-2.4500E-02

4.0493E-03

-1.7038E-06

S10

12.6464

-9.4131E-03

3.4362E-03

5.3641E-04

-2.0136E-05

-4.1070E-07

S11

1.3374

-1.8274E-02

1.6772E-03

1.6163E-04

-7.7704E-06

-1.8632E-06

S12

2.8409

9.5600E-03

-4.2221E-03

1.0718E-03

-1.3639E-04

1.6832E-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.

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 convex-concave lens with negative power, and has a convex 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 L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens element with positive refractive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element L6 is a convex-concave lens element with positive power, i.e., the object-side surface S11 is convex and the image-side surface S12 is concave. 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 surface S13 and an image-side surface 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 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 cone coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

k

A4

A6

A8

A10

A12

S3

-0.8586

-2.5697E-03

-9.6559E-04

1.3330E-04

-7.2581E-06

1.4853E-07

S4

-2.4184

8.2770E-02

-2.0910E-02

3.1355E-03

-1.5838E-04

-2.5948E-06

S8

-0.4639

-3.3137E-02

1.3056E-02

-6.7371E-03

2.1477E-03

2.9817E-04

S9

-1.0891

-1.6005E-01

6.7766E-02

-2.1780E-02

3.6251E-03

-1.2956E-05

S10

4.8486

-2.0833E-02

2.9824E-03

9.2476E-04

-5.7898E-05

-5.4215E-07

S11

-0.5732

-1.4109E-02

-1.5034E-03

2.7341E-04

1.1919E-04

-1.5953E-05

S12

21.4885

3.1606E-02

-1.2718E-02

2.1778E-03

-1.3862E-04

9.5873E-06

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.

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

Flour mark

k

A4

A6

A8

A10

A12

S3

-0.8550

-2.8671E-03

-9.6547E-04

1.3331E-04

-7.2579E-06

1.4851E-07

S4

-2.4180

8.1776E-02

-2.0910E-02

3.1356E-03

-1.5834E-04

-2.5759E-06

S8

-0.4520

-3.3132E-02

1.3061E-02

-6.7407E-03

2.1337E-03

2.8050E-04

S9

-1.0892

-1.6008E-01

6.7758E-02

-2.1780E-02

3.6266E-03

-1.4910E-05

S10

4.8484

-1.7823E-02

2.9814E-03

9.2434E-04

-5.7969E-05

-5.3139E-07

S11

-0.5738

-1.4113E-02

-1.5032E-03

2.7340E-04

1.1916E-04

-1.5965E-05

S12

22.1232

2.9612E-02

-1.2719E-02

2.1776E-03

-1.3864E-04

9.5905E-06

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.

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 L4 is a convex-concave lens with negative power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens element with positive refractive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element L6 is a convex-concave lens element with positive power, i.e., the object-side surface S11 is convex and the image-side surface S12 is concave. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

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

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.

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

61.2259

6.1613E-03

-1.3397E-03

1.3529E-04

-7.0148E-06

1.4903E-07

S4

-0.9439

1.8960E-02

2.2182E-03

-1.0963E-03

1.5636E-04

-1.3462E-06

S8

-14.0251

-9.8902E-03

1.3994E-03

3.1420E-03

-1.7202E-03

1.9024E-04

S9

-0.9949

-9.4133E-02

3.2188E-02

-5.4232E-03

5.5637E-04

-1.9712E-05

S10

1.9525

1.6368E-02

-4.3819E-03

1.9190E-03

-1.7170E-04

1.2110E-06

S11

-14.3894

1.4323E-02

-5.2722E-03

1.3042E-03

-9.2439E-05

1.3027E-06

S12

-254.5237

8.8696E-04

-4.1801E-05

3.0270E-04

-9.3739E-05

2.2143E-05

TABLE 16

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, F, H, D, BFL, TL, F1, F2, F3, F4, F5, F6, SAG41, D41, R11, R12, R31, R32, R41, D1, D3 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. 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 having a negative optical power;

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 convex surface;

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

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

a sixth lens having a positive optical power.

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

3. An optical lens barrel according to claim 1, wherein the object side surface of the second lens is concave and the image side surface is concave.

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

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

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

7. An optical lens barrel according to claim 1, wherein at least two of the second lens, the fourth lens, the fifth lens and the sixth lens have aspherical mirror surfaces.

8. An optical lens barrel according to any one of claims 1 to 7, wherein a distance TTL between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis and a total effective focal length F of the optical lens satisfy: TTL/F is less than or equal to 16.

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 a negative optical power;

a fifth lens having a positive optical power; and

a sixth lens having positive optical power;

a radius of curvature R31 of an object-side surface of the third lens and a radius of curvature R32 of an image-side surface of the third lens satisfy: the absolute value of R31/R32 is more than or equal to 0.5 and less than or equal to 2.5.

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.