CN114442260A

CN114442260A - Optical lens and electronic device

Info

Publication number: CN114442260A
Application number: CN202011194549.0A
Authority: CN
Inventors: 王东方; 马奥林; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2022-05-06

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 with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex 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 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. In order to acquire 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 acquiring external information by the assistant driving system and needs to have higher resolving power. Because the actual road condition is relatively complex, when the automobile assistant driving system detects the actual road, the optical lens is required to have better identification capability for objects with different colors, and therefore, the optical lens is required to have higher color identification degree. In particular, in order to improve the imaging quality of the existing vehicle-mounted lens, most lens manufacturers generally increase the number of lenses to improve the imaging capability of the lens, but this will increase the cost to some extent, and also seriously affect the miniaturization characteristic of the lens. In addition, in view of safety, such a vehicle-mounted lens is also required to have high imaging stability so as to adapt to various severe environments and avoid the risk of significant degradation of the imaging performance of the lens caused by a large temperature difference.

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 with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex 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 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 has a positive or negative power.

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

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

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

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

In one embodiment, at least two of the second lens, the third 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 image plane of the optical lens on the optical axis and a total effective focal length F of the optical lens may satisfy: TTL/F is less than or equal to 8.

In one embodiment, 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 0.3.

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 on the optical axis from the center of the image-side surface of the sixth lens element to the imaging surface of the optical lens and a distance TTL on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the optical lens may satisfy: BFL/TTL is more than or equal to 0.06.

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 0.4 and 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 the | F6/F | is more than or equal to 2.3.

In one embodiment, a distance d6 between the center of the object-side surface of the sixth lens and the center of the image-side surface of the sixth lens and a distance TTL between the center of the object-side surface of the first lens and the imaging plane of the optical lens on the optical axis satisfy: d6/TTL is less than or equal to 0.25.

In one embodiment, a distance d56 between the center of the image-side surface of the fifth lens element and the center of the object-side surface of the sixth lens element on the optical axis and a distance TTL between the center of the object-side surface of the first lens element and the imaging surface of the optical lens element on the optical axis satisfy: d56/TTL is not less than 0.009 and not more than 0.25.

In one embodiment, the half-image height H corresponding to the maximum half field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the maximum field angle of the optical lens may satisfy: (FOV XF)/H is less than or equal to 70 degrees.

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) ≥ 1.55.

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)) > 0.02.

In one embodiment, a maximum clear half-aperture D21 of an object-side surface of the second lens corresponding to the maximum field angle of the optical lens, a maximum clear half-aperture D22 of an image-side surface of the second lens corresponding to the maximum field angle of the optical lens, a distance SAG21 on the optical axis from an intersection point of the object-side surface of the second lens and the optical axis to the maximum clear aperture of the object-side surface of the second lens, and a distance SAG22 on the optical axis from an intersection point of the image-side surface of the second lens and the optical axis to the maximum clear aperture of the image-side surface of the second lens may satisfy: 0.5-3 of arctan (SAG21/D21)/arctan (SAG 22/D22).

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 an 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 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 satisfy: R11/(R12+ d1) ≥ 1.55.

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 has a positive optical power, and the object side surface is concave and the image side surface is convex.

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

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

In one embodiment, the 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)) is more than or equal to 0.02.

In one embodiment, a maximum clear half-aperture D21 of an object-side surface of the second lens corresponding to the maximum field angle of the optical lens, a maximum clear half-aperture D22 of an image-side surface of the second lens corresponding to the maximum field angle of the optical lens, a distance SAG21 on the optical axis from an intersection point of the object-side surface of the second lens and the optical axis to the maximum clear aperture of the object-side surface of the second lens, and a distance SAG22 on the optical axis from an intersection point of the image-side surface of the second lens and the optical axis to the maximum clear aperture of the image-side surface of the second lens may satisfy: 0.5 or more of arctan (SAG21/D21)/arctan (SAG22/D22) or less than 3.

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 six lenses are adopted, and the shapes, focal powers and the like of the lenses are optimally set, so that the optical lens has at least one beneficial effect of miniaturization, small distortion, good chromatic aberration, low cost, high resolution, excellent ghost image performance, good temperature 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 view showing a structure of 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 view showing a structure of 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; and

FIG. 7 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, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the 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 after being incident to the lens, the aperture of the rear lens can be controlled, and the miniaturization is realized. The first lens is in a meniscus shape, so that light rays with a large visual field can be collected as much as possible and enter a rear optical system, and the light flux is increased. The object side surface of the first lens is a convex surface, so that water drops can slide off in actual use environments such as rainy and snowy weather, and the influence on imaging is reduced.

In exemplary embodiments, the second lens may have a positive or negative optical power. The second lens may have a meniscus type. The arrangement of the focal power and the surface type of the second lens is beneficial to smooth transition of light rays to a rear optical system. Preferably, the second lens may have an aspherical mirror surface to improve the resolving power.

In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex type. The focal power and the surface type arrangement of the third lens are beneficial to converging light rays. Particularly, the third lens can be made of a high-refractive-index material, so that the front end caliber can be reduced, and the imaging quality can be improved. The third lens can have an aspheric surface to improve the 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-concave type, a concave-convex type, or a convex-convex type. This power and surface type arrangement of the sixth lens helps to further concentrate the light. Preferably, the sixth lens may have an aspherical mirror surface to further improve the resolution quality and the ability to correct aberrations.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 8, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F further satisfy: TTL/F is less than or equal to 7. The TTL/F is less than or equal to 8, 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 0.3, 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 0.2. The TTL/H/FOV is less than or equal to 0.3, 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 are not changed.

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 0.065. 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: and the BFL/TTL is more than or equal to 0.06, wherein the BFL is the distance from the center of the image side surface of the sixth lens element to the imaging surface of the optical lens on the optical axis, and the TTL is the distance from the center of the object side surface of the first lens element to the imaging surface of the optical lens on the optical axis. More specifically, BFL and TTL further satisfy: BFL/TTL is more than or equal to 0.08. The BFL/TTL is more than or equal to 0.06, and the back focus BFL of the optical lens has a certain length (longer) on the basis of realizing miniaturization, thereby being convenient for assembly.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F5/F4| is less than or equal to 0.4 and less than or equal to 2.5, 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 0.6 and less than or equal to 2. The condition that the absolute value of F5/F4 is less than or equal to 0.4 is less than or equal to 2.5 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: and | F6/F | ≧ 2.3, 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 | F6/F | is more than or equal to 3.5. F6 and F further satisfy: and | F6/F | ≧ 7. The requirement that the absolute value of F6/F is more than or equal to 2.3 is met, and the correction of chromatic aberration is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: d6/TTL is less than or equal to 0.25, wherein d6 is the center thickness of the sixth lens, namely the distance from the center of the object side surface of the sixth lens to the center of the image side surface of the sixth 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, d6 and TTL further satisfy: d6/TTL is less than or equal to 0.18. D6/TTL is less than or equal to 0.25, TTL can be shortened on the premise of ensuring imaging quality, and cost is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.009 ≦ d56/TTL ≦ 0.25, wherein d56 is a distance on the optical axis from the center of the image-side surface of the fifth lens to the center of the object-side surface of the sixth lens, and TTL is a distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens. More specifically, d56 and TTL further satisfy: d56/TTL is more than or equal to 0.01 and less than or equal to 0.2. D56/TTL of more than or equal to 0.009 and less than or equal to 0.25 is satisfied, which is beneficial to improving ghost images and is convenient for lens assembly.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV multiplied by F)/H is less than or equal to 70 degrees, wherein FOV is the maximum half field angle of the optical lens, F is the total effective focal length of the optical lens, and H is the half image height corresponding to the maximum field angle of the optical lens. More specifically, FOV, F and H further satisfy: (FOV XF)/H is less than or equal to 65 degrees. The condition that (FOV multiplied by F)/H is less than or equal to 70 degrees is satisfied, so that the optical lens has the characteristics of small distortion, long focus and the like, and the optical lens is matched with a larger chip.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R11/(R12+ d1) ≧ 1.55, 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, d1 is the center thickness of the first lens, and 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) ≥ 1.6. The requirement that R11/(R12+ d1) is more than or equal to 1.55 is met, and the collection of light rays with larger angles into the optical lens is facilitated.

Fig. 7 shows a schematic diagram of the rise SAG of the object side S of the lens L of the present application. D1 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 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: and arctan (D41/(R41-SAG41)) is more than or equal to 0.02, 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)) > 0.05. The requirement that arctan (D41/(R41-SAG41)) is more than or equal to 0.02 helps to reduce ghost images.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.5 & lt arctan (SAG21/D21)/arctan (SAG22/D22) & lt 3, wherein D21 is the maximum clear half aperture of the object side surface of the second lens corresponding to the maximum field angle of the optical lens, D22 is the maximum clear half aperture of the image side surface of the second lens corresponding to the maximum field angle of the optical lens, SAG21 is the distance on the optical axis from the intersection point of the object side surface of the second lens and the optical axis to the maximum clear aperture of the object side surface of the second lens, and SAG22 is the distance on the optical axis from the intersection point of the image side surface of the second lens and the optical axis to the maximum clear aperture of the image side surface of the second lens. More specifically, SAG21, D21, SAG22, and D22 may further satisfy: 0.8 or more of arctan (SAG21/D21)/arctan (SAG22/D22) or less than 2. The requirement of 0.5 ≦ arctan (SAG21/D21)/arctan (SAG22/D22) ≦ 3 is favorable for smooth transition of peripheral rays of the lens and reduction of sensitivity of the lens.

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 diaphragm is arranged between the second lens and the third 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 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 according to actual needs.

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

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

In an exemplary embodiment, the fourth lens and the fifth lens may be cemented to form a cemented lens. The fourth lens with 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, CRA, distortion optimization 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.

In an exemplary embodiment, the positions of the fourth lens having a negative power and the fifth lens having a positive power in the cemented lens may be interchanged. In particular, the fifth lens having positive optical power is preferably a material having a low refractive index for the purpose of eliminating chromatic aberration.

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

In an exemplary embodiment, the first lens, the fourth lens, and the fifth lens may be spherical lenses. The second lens, the third 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 arrangement of the aspheric lens helps to correct system aberration and improve the resolution.

According to the optical lens of the embodiment of the application, through reasonable setting of the shapes and focal powers of all lenses, under the condition that only 6 lenses are used, at least one beneficial effect that an optical system has the advantages of high image resolution (more than eight million pixels), low cost, small distortion, good chromatic aberration, good ghost image performance, miniaturization, good imaging quality at high and low temperatures and the like is achieved. Meanwhile, the optical system also meets the requirements of small lens size, small front end caliber, low sensitivity and high production yield. The total effective focal length of the optical lens is longer, so that the optical lens has high-angle resolution, and the identification degree of an environmental object is improved. The optical lens also has better chromatic aberration correction capability, and can accurately identify objects with different colors in road detection. 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 glass and 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 element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S6 and a convex image-side surface S7. The 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 L6 has positive power and is a convex-concave lens in the region close to the optical axis, i.e., the object-side surface S11 is convex in the region close to the optical axis, and the image-side surface S12 is concave in the region close to the optical axis. 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 between the second lens L2 and the third lens L3 at a position close to the object side surface S6 of the third lens L3.

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 S6 and the image-side surface S7 of the third lens L3, and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 may be aspheric, and the surface type x of each aspheric lens may be defined by, but is not limited to, the following aspheric formula:

wherein x is the distance rise from the vertex of the aspheric surface 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 which can be used for the respective aspherical mirror surfaces S3, S4, S6, S7, S11 and S12 in example 1 are given in table 2 below.

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S3

-3.9876

-2.9052E-03

3.4795E-05

4.7775E-07

-4.1788E-07

3.8730E-08

-8.6540E-10

-1.1754E-11

S4

-0.5574

-4.7027E-04

4.3073E-05

-1.0122E-06

-9.2241E-08

6.2329E-09

1.1447E-11

-4.3644E-12

S6

1.8806

-9.4189E-04

7.1305E-05

-4.8884E-06

1.0501E-07

9.1398E-09

-9.1903E-10

2.8185E-11

S7

2.6053

-1.5939E-04

1.3047E-06

1.3194E-06

-7.7374E-08

-1.5304E-09

3.9869E-10

-1.2536E-11

S11

155.0000

-1.4384E-03

1.3451E-05

-2.1931E-06

1.7558E-07

-5.8845E-09

-2.3347E-12

3.3699E-12

S12

136.8510

-1.6261E-03

8.3345E-06

1.0503E-07

-5.1722E-09

2.0109E-10

-1.4409E-11

3.1865E-13

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.

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 element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S6 and a convex image-side surface S7. The 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 has positive power and is a biconvex lens in the region close to the optical axis, i.e., the object-side surface S11 is convex in the region close to the optical axis, and the image-side surface S12 is convex in the region close to the optical axis. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

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 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 element L3 is a biconvex lens element with positive refractive power, and has a convex object-side surface S6 and a convex image-side surface S7. The 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 L6 has positive power and is a meniscus lens in the region close to the optical axis, i.e., the object-side surface S11 is concave in the region close to the optical axis and the image-side surface S12 is convex in the region close to the optical axis. 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 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

A14

A16

S3

-3.0062

-1.4662E-03

5.8853E-06

3.9979E-06

-5.6446E-07

3.8730E-08

-8.6540E-10

-1.1754E-11

S4

-3.9717

-2.8422E-04

-9.7764E-06

2.4388E-06

-1.7363E-07

6.2329E-09

1.1447E-11

-4.3644E-12

S6

6.7288

1.6634E-04

-5.0148E-05

1.6429E-06

-8.1936E-08

9.1398E-09

-9.1903E-10

2.8185E-11

S7

-1.0585

-6.0818E-04

-1.1180E-06

9.8696E-07

-9.4588E-08

-1.5304E-09

3.9869E-10

-1.2536E-11

S11

-53.6239

-2.2722E-03

6.4338E-06

-1.7477E-06

1.7664E-07

-5.8845E-09

-2.3347E-12

3.3699E-12

S12

199.0000

-2.1440E-03

2.2546E-05

-3.0123E-07

1.2450E-08

-2.5322E-10

-1.4409E-11

3.1865E-13

TABLE 6

Example 4

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

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

The first lens element L1 is a convex-concave lens element with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 is a concave-convex lens element with negative power, and has a concave object-side surface S3 and a convex 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 S6 and a convex image-side surface S7. 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 L6 has positive power and is a convex-concave lens in the region close to the optical axis, i.e., the object-side surface S11 is convex in the region close to the optical axis, and the image-side surface S12 is concave in the region close to the optical axis. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

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

A14

A16

S3

0.3707

1.6262E-03

-1.0214E-06

2.4007E-06

-6.6746E-08

5.1540E-09

-2.3718E-10

1.0165E-11

S4

-0.5374

1.2818E-04

2.7284E-05

-2.3672E-06

1.3256E-07

-3.8020E-09

3.8921E-11

1.5132E-13

S6

-0.9885

-4.3948E-04

5.3335E-05

-7.9089E-06

8.0490E-07

-5.1228E-08

1.8092E-09

-2.6795E-11

S7

15.3563

-5.8494E-04

2.3153E-05

-1.1784E-06

1.5821E-07

-1.4418E-08

6.5501E-10

-1.1490E-11

S11

3.1370

-3.3855E-03

-7.9241E-05

5.7579E-06

-1.1122E-06

1.0027E-07

-4.8543E-09

9.7846E-11

S12

-109.5068

3.9756E-04

-6.4203E-04

8.0425E-05

-7.0341E-06

3.8453E-07

-1.1608E-08

1.4665E-10

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 element L2 is a concave-convex lens element with negative power, and has a concave object-side surface S3 and a convex 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 S6 and a convex image-side surface S7. 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 L6 has positive power and is a meniscus lens in the region close to the optical axis, i.e., the object-side surface S11 is concave in the region close to the optical axis and the image-side surface S12 is convex in the region close to the optical axis. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Optionally, the optical lens may further include a filter L7 having an object side S13 and an image side S14. The filter L7 can be used to correct color deviations. The optical lens may further include a protective glass L8 having an object-side surface S15 and an image-side surface S16. The protective glass L8 can be used to protect the image sensing chip IMA located at the imaging plane S17. 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 conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S3

0.2067

9.7620E-04

-7.3680E-06

1.8282E-06

-1.7100E-09

2.2278E-09

-2.3718E-10

1.0165E-11

S4

-0.2916

4.7533E-05

2.1688E-05

-1.9763E-06

1.3106E-07

-4.6132E-09

7.7389E-11

-3.9532E-13

S6

-0.8121

-4.2963E-04

4.8386E-05

-7.6460E-06

8.0836E-07

-5.2229E-08

1.8441E-09

-2.7109E-11

S7

-2.7707

-4.5011E-04

1.4941E-05

-1.1943E-06

1.7075E-07

-1.4777E-08

6.4681E-10

-1.1174E-11

S11

198.0000

-2.3481E-03

-1.9084E-04

2.4280E-05

-2.2643E-06

1.2560E-07

-4.8543E-09

9.7846E-11

S12

-27.1595

-1.3985E-03

-4.2809E-04

7.1617E-05

-6.9512E-06

3.8914E-07

-1.1740E-08

1.4665E-10

Watch 10

Example 6

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

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

The first lens element L1 is a convex-concave lens element with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 is a concave-convex lens element with negative power, and has a concave object-side surface S3 and a convex 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 S6 and a convex image-side surface S7. 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 has positive power and is a biconvex lens in the region close to the optical axis, i.e., the object-side surface S11 is convex in the region close to the optical axis, and the image-side surface S12 is convex in the region close to the optical axis. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

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

TABLE 11

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S3

0.1465

1.1449E-03

-9.2654E-06

1.5519E-06

3.3334E-08

8.1115E-10

-2.3718E-10

1.0165E-11

S4

-0.3680

8.0174E-05

2.1971E-05

-2.0864E-06

1.3762E-07

-4.7486E-09

7.7113E-11

-3.9531E-13

S6

-0.9004

-4.2978E-04

4.9612E-05

-7.6999E-06

8.0848E-07

-5.1979E-08

1.8366E-09

-2.7109E-11

S7

0.6772

-5.1496E-04

2.1201E-05

-1.5938E-06

1.9044E-07

-1.5282E-08

6.5279E-10

-1.1174E-11

S11

97.2733

-2.3856E-03

-3.8903E-05

-9.0747E-07

-3.9772E-07

7.2600E-08

-4.8543E-09

9.7846E-11

S12

137.4811

-1.4666E-03

-2.4799E-04

4.5541E-05

-5.1037E-06

3.2504E-07

-1.0883E-08

1.4665E-10

TABLE 12

In conclusion, examples 1 to 6 each satisfy the relationship shown in table 13 below. In table 13, units of TTL, F, H, D, BFL, F6, F4, F5, D1, D6, D56, SAG41, SAG21, SAG22, D41, D21, D22, R41, R11, R12 are millimeters (mm), and units of FOV are degrees (°).

Watch 13

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 with focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex 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 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 according to claim 1, characterized in that the second lens has a positive or negative optical power.

3. 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.

4. An optical lens barrel according to claim 1, wherein the sixth lens element has a concave 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 convex 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 third 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 8.

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 an 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 R11 of an object-side surface of the first lens, a radius of curvature R12 of an image-side surface of the first lens, and a distance d1 from a center of the object-side surface of the first lens to a center of the image-side surface of the first lens satisfy: R11/(R12+ d1) ≥ 1.55.

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.