CN114428385A

CN114428385A - Optical lens and electronic device

Info

Publication number: CN114428385A
Application number: CN202011179018.4A
Authority: CN
Inventors: 张俊明; 徐超; 杨佳; 俞魁榜
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2022-05-03
Anticipated expiration: 2040-10-29
Also published as: CN114428385B

Abstract

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

With the rapid development of the automobile driving assistance technology, the application of the optical lens on the automobile is more and more extensive. Meanwhile, the requirements of users on the imaging quality of the vehicle-mounted lens are higher and higher. The range of images acquired by the vehicle-mounted lens has a crucial influence on the safety of the driver.

How to increase the imaging range of the optical lens by increasing the angle of view while ensuring the imaging quality of the optical lens; how to make the optical lens have higher relative illumination so that the optical lens can collect more light; how to make the optical lens work stably and normally in an environment with a large temperature difference, and keep the characteristics of no image plane shift, clear imaging and the like, is a major problem to be solved by many lens designers at present.

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

In one embodiment, the fifth lens element has positive optical power, and the object side surface of the fifth lens element is convex and the image side surface of the fifth lens element is convex.

In one embodiment, the fifth lens element has a negative optical power, and the object side surface is concave and the image side surface is concave.

In one embodiment, the fifth lens element has positive optical power, and the object side surface of the fifth lens element is concave and the image side surface of the fifth lens element is convex.

In one embodiment, the sixth lens element has a negative optical power, and the object side surface is concave and the image side surface is concave.

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

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

In one embodiment, the third lens and the fourth lens have aspherical mirror surfaces.

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

In one embodiment, the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.02, 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; h is the image height corresponding to the maximum field angle of the optical lens; the FOV is the maximum field angle of the optical lens.

In one embodiment, the optical lens may satisfy: D/H/FOV is less than or equal to 0.02, wherein D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens; the FOV is the maximum field angle of the optical lens.

In one embodiment, the optical lens may satisfy: BFL/TL is more than or equal to 0.12, wherein BFL is the distance from the center of the image side surface of the sixth lens to the imaging surface of the optical lens on the optical axis; TL is a distance on the optical axis from the center of the object-side surface of the first lens to the center of the image-side surface of the sixth lens.

In one embodiment, the optical lens may satisfy: 0.8-1.6 of SagS2/SagS1, wherein SagS1 is the distance on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the maximum clear aperture of the object-side surface of the first lens; SagS2 represents the distance on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the maximum clear aperture of the image-side surface of the first lens.

In one embodiment, the optical lens may satisfy: l (R3-R4)/(R3+ R4) | is less than or equal to 1.2, wherein R3 is the curvature radius of the object side surface of the second lens; r4 is the radius of curvature of the image-side surface of the second lens.

In one embodiment, the optical lens may satisfy: the absolute value of F3/F2 is more than or equal to 0.8 and less than or equal to 2, wherein F2 is the effective focal length of the second lens; f3 is the effective focal length of the third lens.

In one embodiment, the optical lens may satisfy: i F3/F I is less than or equal to 5, wherein F3 is the effective focal length of the third lens; and F is the total effective focal length of the optical lens.

In one embodiment, the optical lens may satisfy: the absolute value of F5/F6 is more than or equal to 0.3 and less than or equal to 3, wherein F5 is the effective focal length of the fifth lens; f6 is the effective focal length of the sixth lens.

In one embodiment, the optical lens may satisfy: SagS5/SagS6 is more than or equal to 4, wherein SagS5 is the distance between the intersection point of the object side surface of the third lens and the optical axis and the maximum clear aperture of the object side surface of the third lens on the optical axis; the SagS6 is a distance on the optical axis from the intersection point of the image side surface of the third lens and the optical axis to the maximum clear aperture of the image side surface of the third lens.

In one embodiment, the optical lens may satisfy: (FOV multiplied by F)/H is more than or equal to 50 degrees, wherein the FOV is the maximum field angle of the optical lens; f is the total effective focal length of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens.

In one embodiment, the optical lens may satisfy: i F56/F I is equal to or more than 4, wherein F56 is the combined focal length of the fifth lens and the sixth lens; and F is the total effective focal length of the optical lens.

Another aspect of the present application provides an optical lens. The optical lens sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens having a positive optical power; a fifth lens having optical power; and a sixth lens having optical power; the optical lens can satisfy: D/H/FOV is less than or equal to 0.02, wherein D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens; the FOV is the maximum field angle of the optical lens.

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

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

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

In one embodiment, the fourth lens element has a concave 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 six lenses are adopted, and the shape, focal power and the like of each lens are optimally set, so that the optical lens has at least one beneficial effect of wide angle, miniaturization, high resolution, high relative illumination, small caliber, low cost, 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 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 is in a meniscus shape facing the object side, so that light can be collected favorably, and the light flux is increased. Preferably, the first lens can use a high-refractive-index material, which is beneficial to reducing the front port diameter and improving the imaging quality.

In an exemplary embodiment, the second lens may have a negative power. The second lens may have a convex-concave type. The second lens is in a meniscus shape towards the object side, so that the light rays can be further collected and smoothly transited. Preferably, the second lens can use a high-refractive-index material, which is beneficial to reducing the front port diameter and improving the imaging quality.

In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex-concave type. The focal power and the surface type of the third lens are favorable for collecting and converging light rays, so that the light rays can smoothly enter a rear system. The third lens can adopt an aspheric lens, which is beneficial to reducing aberration and improving imaging quality.

In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a meniscus type. The focal power and the surface type arrangement of the fourth lens can ensure that the object side surface of the fourth lens is gentle and the image side surface of the fourth lens is curved, thereby being beneficial to diverging light. The fourth lens can adopt an aspheric lens, which is beneficial to reducing aberration and improving imaging quality.

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

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

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 fifth lens and the sixth lens may be cemented to form a cemented lens. The fifth lens with the convex image side surface is glued with the sixth lens with the concave object side surface or the fifth lens with the concave image side surface is glued with the sixth lens with the convex object side surface, so that the smooth transition of front light to a rear optical system is facilitated, the size of the optical lens is facilitated to be reduced, and the total length of the optical lens is reduced while the optical performances of the optical lens, such as relative illumination, CRA (CRA) and the like, are improved. Of course, the fifth lens and the sixth lens may not be cemented, which is advantageous for improving the resolution.

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

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F56/F | ≧ 4, wherein F56 denotes the effective focal length of the cemented lens formed by the fifth lens and the sixth lens cemented together, and F is the total effective focal length of the optical lens. The optical lens meets the condition that | F56/F | > is more than or equal to 4, light trend between the fourth lens and an imaging surface of the optical lens is favorably controlled, light is smoothly transited to the imaging surface, relative illumination is favorably improved, aberration caused after large-angle light is injected into the fourth lens is reduced, resolution quality is improved, and meanwhile the optical lens is compact in structure and is favorable for miniaturization. More specifically, F56 and F further satisfy: and | F56/F | ≧ 5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/FOV is less than or equal to 0.02, 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; h is the image height corresponding to the maximum field angle of the optical lens; the FOV is the maximum field angle of the optical lens. The optical lens meets the condition that TTL/H/FOV is less than or equal to 0.02, and has the characteristic of miniaturization. More specifically, TTL, H, and FOV further satisfy: TTL/H/FOV is less than or equal to 0.018.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.02, wherein D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens; the FOV is the maximum field angle of the optical lens. The optical lens meets the requirement that D/H/FOV is less than or equal to 0.02, has the characteristic of small front port diameter, and can realize miniaturization. More specifically, D, H and the FOV further satisfy: D/H/FOV is less than or equal to 0.015.

In an exemplary embodiment, an optical lens according to the present application may satisfy: BFL/TL is more than or equal to 0.12, wherein BFL is the distance from the center of the image side surface of the sixth lens to the imaging surface of the optical lens on the optical axis; TL is a distance on the optical axis from the center of the object-side surface of the first lens to the center of the image-side surface of the sixth lens. The optical lens meets the condition that BFL/TL is more than or equal to 0.12, the back focus BFL is longer on the basis of realizing miniaturization, and the assembly of the module is facilitated. Meanwhile, the total length TL of the lens group is shorter, which is beneficial to making the structure of the optical lens compact, reducing the sensitivity of the lens to the Modulation Transfer Function (MTF), improving the production yield and reducing the production cost. More specifically, BFL and TL may further satisfy: BFL/TL is more than or equal to 0.15.

Fig. 9 shows a schematic diagram of the rise Sag of the object-side surface 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: 0.8-1.6 of SagS2/SagS1, wherein SagS1 is the distance on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the maximum clear aperture of the object-side surface of the first lens; SagS2 represents the distance on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the maximum clear aperture of the image-side surface of the first lens. The optical lens meets the requirement that SagS2/SagS1 is more than or equal to 0.8 and less than or equal to 1.6, the shape of the first lens is enabled to be close to the arrangement of concentric circles, large-angle light is collected, the large-angle light is enabled to be smoothly transited to a rear optical system, the aperture of the front end of the lens is reduced, the size is reduced, miniaturization is facilitated, and the cost is reduced. More specifically, SagS2 and SagS1 may further satisfy: 1 is less than or equal to SagS2/SagS1 is less than or equal to 1.4.

In an exemplary embodiment, an optical lens according to the present application may satisfy: l (R3-R4)/(R3+ R4) | is less than or equal to 1.2, wherein R3 is the curvature radius of the object side surface of the second lens; r4 is the radius of curvature of the image-side surface of the second lens. The optical lens satisfies | (R3-R4)/(R3+ R4) | ≦ 1.2, can correct aberration of the optical lens, and is advantageous for collecting light of a front system and smoothly transitioning the light to a rear system, thereby reducing tolerance sensitivity of the optical lens. More specifically, R3 and R4 may further satisfy: i (R3-R4)/(R3+ R4) I is less than or equal to 0.9.

In an exemplary embodiment, an optical lens according to the present application may satisfy: the absolute value of F3/F2 is more than or equal to 0.8 and less than or equal to 2, wherein F2 is the effective focal length of the second lens; f3 is the effective focal length of the third lens. The optical lens meets the condition that | F3/F2| is more than or equal to 0.8 and less than or equal to 2, the focal lengths of two adjacent lenses of the second lens and the third lens are close, light rays are smoothly transited, and image quality is improved. More specifically, F3 and F2 may further satisfy: the absolute value of F3/F2 is more than or equal to 1.0 and less than or equal to 1.8.

In an exemplary embodiment, an optical lens according to the present application may satisfy: i F3/F I is less than or equal to 5, wherein F3 is the effective focal length of the third lens; and F is the total effective focal length of the optical lens. The optical lens meets the condition that | F3/F | is less than or equal to 5, so that the focal length of the third lens is shorter, the light collection is facilitated, and the light enters the lens as much as possible. More specifically, F3 and F further satisfy: the ratio of F3/F is less than or equal to 3.5.

In an exemplary embodiment, an optical lens according to the present application may satisfy: the absolute value of F5/F6 is more than or equal to 0.3 and less than or equal to 3, wherein F5 is the effective focal length of the fifth lens; f6 is the effective focal length of the sixth lens. The optical lens meets the condition that | F5/F6| is more than or equal to 0.3 and less than or equal to 3, which is favorable for reducing chromatic aberration and improving image quality, and simultaneously, the focal lengths of the last two lenses are close, which is favorable for improving thermal compensation. More specifically, F5 and F6 further satisfy: the absolute value of F5/F6 is more than or equal to 0.5 and less than or equal to 2.8.

In an exemplary embodiment, an optical lens according to the present application may satisfy: SagS5/SagS6 is more than or equal to 4, wherein SagS5 is the distance between the intersection point of the object side surface of the third lens and the optical axis and the maximum clear aperture of the object side surface of the third lens on the optical axis; SagS6 represents the distance on the optical axis from the intersection point of the image-side surface of the third lens and the optical axis to the maximum clear aperture of the image-side surface of the third lens. The optical lens meets the condition that SagS5/SagS6 is more than or equal to 4, the difference between the sagS5 of the object side surface and the sagS6 of the image side surface of the third lens located in the middle position is larger, the divergent light rays can enter a rear optical system, the aperture of the lens is reduced, the size is reduced, the miniaturization is realized, and the cost is reduced. More specifically, SagS5 and SagS6 further satisfy: SagS5/SagS6 is not less than 6.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV multiplied by F)/H is more than or equal to 50 degrees, wherein the FOV is the maximum field angle of the optical lens; f is the total effective focal length of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens. The optical lens meets the condition that (FOV multiplied by F)/H is more than or equal to 50 degrees, is favorable for enabling the optical lens to simultaneously meet the characteristics of long focus, large field angle and the like, and is favorable for improving the relative illumination. More specifically, FOV, F, and H may further satisfy (FOV × F)/H ≧ 54.

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

In an exemplary embodiment, the first lens, the second lens, the fifth lens, and the sixth lens may be spherical lenses. The third lens and the fourth 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.

The optical lens according to the above-described embodiment of the present application achieves at least one advantageous effect of an optical system having high resolution, miniaturization, wide angle, and good imaging quality, etc., in the case of using only six lenses, by appropriate setting of each lens shape and optical power. Meanwhile, the optical lens also meets the requirements of small volume, small front end caliber, low sensitivity and high production yield. The optical lens also has a longer back focus for easy assembly. The optical lens also has the characteristic of smaller CRA (crazing code), stray light generated when the rear end of light rays is emitted to the lens barrel is avoided, the optical lens can be well matched with a vehicle-mounted chip, and color cast and dark corner phenomena cannot be generated. Meanwhile, the optical lens has good temperature adaptability, and has small imaging effect change and stable image quality in high and low temperature environments such as the range of-40 ℃ to 105 ℃.

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

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens L3 is a meniscus lens with positive power, with the object side S5 being convex and the image side S6 being concave. The fourth lens L4 is a meniscus lens with positive refractive power, and has a concave object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens element L6 is a meniscus lens element with negative power, and has a concave object-side surface S11 and a convex image-side surface S12. Light from the object passes through each of the surfaces S1 to S12 in sequence and is finally imaged on the imaging plane IMA.

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 image side surface S6 of the third lens L3.

Table 1 shows a radius of curvature R, a thickness T/distance d (it is understood that the thickness T/distance d of the row in which S1 is located is the center thickness T1 of the first lens L1, the thickness T/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 S5 and the image-side surface S6 of the third lens L3 and the object-side surface S8 and the image-side surface S9 of the fourth lens L4 may each be aspheric, and the profile x of each aspheric lens may be defined using, but not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c 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. Table 2 below gives the cone coefficients k and the high-order term coefficients A4, A6, A8, A10 and A12 which can be used for each of the aspherical mirror surfaces S5, S6, S8 and S9 in example 1.

Flour mark

k

A4

A6

A8

A10

A12

S5

1.6888E+00

-1.5244E-04

-6.7907E-06

1.3430E-06

-6.7617E-08

-1.2663E-09

S6

2.2788E+00

3.7051E-04

2.7588E-05

1.4154E-05

-2.9515E-06

2.5364E-07

S8

-5.0724E+01

-6.6980E-03

5.4464E-04

-1.0930E-04

1.0624E-05

-6.0134E-07

S9

-2.2718E-01

-1.1849E-04

1.5203E-06

2.0047E-08

-2.6259E-08

2.6128E-09

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

TABLE 3

Flour mark

k

A4

A6

A8

A10

A12

S5

1.6483E+00

-1.4769E-04

-3.8371E-06

8.4999E-07

-1.3035E-08

-3.7574E-09

S6

-1.0671E+02

4.0202E-04

4.8325E-05

4.8407E-06

-1.5349E-06

1.5193E-07

S8

-4.4804E+01

-6.3760E-03

4.6251E-04

-1.0037E-04

1.0361E-05

-6.4996E-07

S9

-2.3006E-01

-1.1366E-04

6.5115E-07

1.6722E-07

-3.5691E-08

2.8380E-09

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

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens L3 is a meniscus lens with positive power, with the object side S5 being convex and the image side S6 being concave. The fourth lens L4 is a meniscus lens with positive refractive power, and has a concave object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S10 and a concave image-side surface S11. The sixth lens element L6 is a biconvex lens with positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. Light from the object passes through each of the surfaces S1 to S12 in sequence and is finally imaged on the imaging plane IMA.

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.

Table 5 shows the radius of curvature R, thickness T/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

S5

1.8605E+00

1.1725E-04

3.3276E-05

-3.0291E-05

3.4236E-06

-1.1160E-07

S6

7.1380E+01

3.7051E-04

2.7588E-05

1.4154E-05

-2.9515E-06

2.5364E-07

S8

-1.2197E+03

-6.2021E-03

1.2415E-04

-5.5589E-05

-6.8649E-06

1.4708E-06

S9

-1.9479E-01

-1.1778E-04

3.6344E-05

3.1102E-06

-1.5529E-06

9.5166E-08

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 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 T/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

S5

1.7832E+00

1.1197E-04

1.2161E-05

-2.9871E-05

3.5674E-06

-1.1022E-07

S6

7.1380E+01

3.7051E-04

2.7588E-05

1.4154E-05

-2.9515E-06

2.5364E-07

S8

-1.4657E+03

-5.4557E-03

1.2317E-04

-6.1456E-05

-7.5435E-06

1.3279E-06

S9

-1.8024E-01

-1.4188E-04

3.0127E-05

1.5257E-06

-1.5531E-06

1.0594E-07

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

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens L3 is a meniscus lens with positive power, with the object side S5 being convex and the image side S6 being concave. The fourth lens L4 is a meniscus lens with positive refractive power, and has a concave object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a meniscus lens having positive refractive power, and has a concave object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. Light from the object passes through each of the surfaces S1 to S12 in sequence and is finally imaged on the imaging plane IMA.

Table 9 shows the radius of curvature R, thickness T/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

S5

1.9720E+00

2.1135E-04

6.2515E-05

-2.9634E-05

3.1517E-06

-1.2541E-07

S6

7.1380E+01

3.7051E-04

2.7588E-05

1.4154E-05

-2.9515E-06

2.5364E-07

S8

-8.9986E+02

-7.1498E-03

3.6133E-04

-5.0867E-05

-9.0316E-06

1.0191E-06

S9

-2.1613E-01

-8.2768E-05

4.4345E-05

4.8803E-06

-1.3978E-06

6.5703E-08

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 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 T/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

S5

1.9704E+00

2.1174E-04

6.2186E-05

-2.9634E-05

3.1453E-06

-1.2323E-07

S6

7.1380E+01

3.7051E-04

2.7588E-05

1.4154E-05

-2.9515E-06

2.5364E-07

S8

-9.0050E+02

-7.1837E-03

3.2736E-04

-4.5642E-05

-8.7633E-06

9.7400E-07

S9

-2.1608E-01

-8.2935E-05

4.4273E-05

4.8507E-06

-1.3981E-06

6.6125E-08

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

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being convex and the image side S4 being concave. The third lens L3 is a meniscus lens with positive power, with the object side S5 being convex and the image side S6 being concave. The fourth lens L4 is a meniscus lens with positive refractive power, and has a concave object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. Light from the object passes through each of the surfaces S1 to S12 in sequence and is finally imaged on the imaging plane IMA.

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

Watch 13

Flour mark

k

A4

A6

A8

A10

A12

S5

1.8453E+00

-1.4836E-04

3.3410E-05

-1.5008E-05

1.8262E-06

-8.3777E-08

S6

7.1380E+01

3.7051E-04

2.7588E-05

1.4154E-05

-2.9515E-06

2.5364E-07

S8

-8.1667E+01

-5.9490E-03

3.0307E-04

-8.1111E-05

1.1983E-05

-9.3213E-07

S9

-1.8416E-01

-1.4575E-04

5.8855E-06

5.6903E-07

-7.8207E-08

3.3265E-09

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 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 T/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

S5

1.8875E+00

-1.5767E-04

-1.1263E-06

-1.1602E-05

1.9112E-06

-1.0409E-07

S6

-2.2023E+01

3.7051E-04

2.7588E-05

1.4154E-05

-2.9515E-06

2.5364E-07

S8

-8.8001E+01

-6.3284E-03

4.9631E-04

-1.2002E-04

1.4036E-05

-8.5356E-07

S9

-1.8508E-01

-1.4504E-04

5.8894E-06

3.9176E-07

-5.2590E-08

2.4311E-09

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 F, TTL, TL, H, BFL, D, R3, R4, SagS1, SagS2, SagS5, SagS6, F1, F2, F3, F4, F5, F6, F56 are millimeters (mm), and units of FOV are degrees (°).

Conditional expression (A) example	Example 1	Example 2	Example 3	Example 4
					F	3.12	3.15	3.18	3.16
TTL	33.68	33.83	32.92	32.88
					TL	28.05	28.07	26.41	26.78
FOV	206.4	206.4	206.4	206.4
					H	10.36	10.49	10.97	10.64
BFL	5.63	5.75	6.51	6.10
					D	28.50	28.53	29.03	29.05
SagS1	4.84	4.86	5.05	5.06
					SagS2	5.97	5.98	6.14	6.15
SagS5	1.14	1.14	1.35	1.33
					SagS6	0.10	0.09	0.12	0.12
F1	-17.62	-17.63	-18.09	-18.09
					F2	-7.22	-7.22	-6.54	-6.53
F3	10.40	10.39	10.33	10.39
					F4	16.00	16.19	7.52	7.44
F5	8.46	8.49	-13.48	-13.99
					F6	-14.09	-14.09	18.84	20.41
F56	17.69	17.87	-58.37	-51.00
					TTL/H/FOV	0.0157	0.0156	0.0145	0.0150
D/H/FOV	0.0133	0.0132	0.0128	0.0132
					BFL/TL	0.201	0.170	0.198	0.186
\|(R3-R4)/(R3+R4)\|	0.703	0.703	0.781	0.782
					SagS2/SagS1	1.23	1.23	1.22	1.22
SagS5/SagS6	11.86	12.18	11.34	11.49
					\|F3/F2\|	1.44	1.44	1.58	1.59
\|F3/F\|	3.33	3.29	3.25	3.28
					\|F5/F6\|	0.60	0.60	0.72	0.69
(FOV×F)/H	62.20	62.03	59.80	61.33
					\|F56/F\|	5.66	5.67	18.37	16.12

TABLE 17-1

TABLE 17-2

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. 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;

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

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

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

a fifth lens having optical power; and

a sixth lens having optical power.

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

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

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

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

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

8. An optical lens according to claim 1, characterized in that the third lens and the fourth lens have aspherical mirror surfaces.

9. An optical lens, in order from an object side to an image side along an optical axis, comprising:

a first lens having a negative optical power;

a second lens having a negative optical power;

a third lens having a positive optical power;

a fourth lens having a positive optical power;

a fifth lens having optical power; and

a sixth lens having optical power;

the optical lens satisfies: D/H/FOV is less than or equal to 0.02, wherein D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens; h is the image height corresponding to the maximum field angle of the optical lens; the FOV is the maximum field angle of the optical lens.

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.