CN113495342A

CN113495342A - Optical lens and electronic device

Info

Publication number: CN113495342A
Application number: CN202010253163.6A
Authority: CN
Inventors: 马奥林; 王东方; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2021-10-12
Anticipated expiration: 2040-04-02
Also published as: CN113495342B

Abstract

The present application discloses an optical lens, sequentially from an object side to an image side along an optical axis, comprising: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens element having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a third lens having a positive optical power; the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface; the fifth lens with positive focal power has a convex object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; and a seventh lens having positive optical power.

Description

Optical lens and electronic device

Technical Field

The present application relates to the field of optical elements, and in particular, to an optical lens and an electronic apparatus including the optical lens.

Background

In recent years, automobile driving assistance systems have been developed at a high speed, and vehicle-mounted optical lenses play an irreplaceable role as eyes for acquiring external information of automobiles. In order to acquire information more accurately, the system needs to be matched with a large chip with higher resolution, so that the requirement on the resolution of the vehicle-mounted optical lens is higher and higher. In order to meet the requirement of higher imaging quality, a structure with more lenses is often selected, but the cost is increased, and the miniaturization of the lens is also seriously influenced.

In addition, in view of safety, the vehicle-mounted optical lens applied to the field of automatic driving has a high requirement on stability, and needs to be capable of coping with various severe environments so as to avoid the obvious reduction of the performance of the lens under different environments.

Therefore, an optical lens capable of matching with a large chip, having high resolution, low cost, miniaturization, small distortion, good temperature performance and the like is required in the market at present, and the requirements of automatic driving application are met.

Disclosure of Invention

The present application provides an optical lens applicable to vehicle-mounted mounting that may solve at least or partially at least one of the above-described disadvantages of the related art, and an electronic apparatus including the optical lens.

An aspect of the present application provides an optical lens that may include, in order from an object side to an image side along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens element having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a third lens having a positive optical power; the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface; the fifth lens with positive focal power has a convex object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; and a seventh lens having positive optical power.

In one embodiment, the object-side surface of the third lens element can be convex and the image-side surface can be concave.

In one embodiment, the object-side surface of the third lens element can be convex and the image-side surface can be convex.

In one embodiment, the object-side surface of the seventh lens element can be concave and the image-side surface can be convex.

In one embodiment, the object-side surface of the seventh lens element can be convex and the image-side surface can be concave.

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

In one embodiment, at least one of the third lens, the fourth lens, and the seventh lens may be an aspherical lens.

In one embodiment, the second lens and the third lens may form a cemented lens.

In one embodiment, the total optical length TTL of the optical lens and the total effective focal length f of the optical lens may satisfy: TTL/f is less than or equal to 7.0.

In one embodiment, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.05.

In one embodiment, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: D/H/FOV is less than or equal to 0.03.

In one embodiment, the optical back focus BFL of the optical lens and the total optical length TTL of the optical lens may satisfy: BFL/TTL is more than or equal to 0.15.

In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: the absolute value of f5/f6 is more than or equal to 0.5 and less than or equal to 2.0.

In one embodiment, a center thickness dn of an nth lens having a largest center thickness among the first to seventh lenses and a center thickness dm of an mth lens having a smallest center thickness among the first to seventh lenses may satisfy: 4.0 < dn/dm < 8.0, wherein n and m are selected from 1, 2, 3, 4, 5, 6 and 7.

In one embodiment, the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the optical lens may satisfy: and | f56/f | ≧ 2.0.

In one embodiment, the total effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: (FOV xf)/H is less than or equal to 65.0.

In one embodiment, the total optical length TTL of the optical lens and the separation distance d11 between the sixth lens and the seventh lens on the optical axis may satisfy: d11/TTL is more than or equal to 0.01.

In one embodiment, the maximum clear half-aperture D12 of the object-side surface of the seventh lens element corresponding to the maximum field angle of the optical lens, the Sg value SAG12 corresponding to the D12, the maximum clear half-aperture D13 of the image-side surface of the seventh lens element corresponding to the maximum field angle of the optical lens, and the Sg value SAG13 corresponding to the D13 may satisfy 0.3 ≦ arctan (SAG12/D12)/arctan (SAG13/D13) ≦ 3.0.

Another aspect of the present application provides an optical lens that may include, in order from an object side to an image side along an optical axis: a first lens element having a convex object-side surface and a concave image-side surface; a second lens element having a concave object-side surface and a concave image-side surface; a third lens; a fourth lens element having a convex object-side surface and a convex image-side surface; a fifth lens element having a convex object-side surface and a convex image-side surface; a sixth lens element having a concave object-side surface and a concave image-side surface; and a seventh lens. The total optical length TTL of the optical lens and the distance d11 between the sixth lens and the seventh lens on the optical axis can satisfy the following conditions: d11/TTL is more than or equal to 0.01.

In one embodiment, the third lens element can have a positive optical power, and the object-side surface can be convex and the image-side surface can be concave.

In one embodiment, the third lens element can have a positive optical power, and the object-side surface can be convex and the image-side surface can be convex.

In one embodiment, the seventh lens element can have a positive optical power, and the object side surface can be concave and the image side surface can be convex.

In one embodiment, the seventh lens element can have a positive optical power, and the object-side surface can be convex and the image-side surface can be concave.

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

In one embodiment, the second lens and the third lens may form a cemented lens.

A further aspect of the present application provides an electronic apparatus including the optical lens as described above and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

First, the optical lens provided by the present application employs a plurality of lenses, for example, the first lens to the seventh lens, and by reasonably optimizing the shapes of the lenses of the optical lens and reasonably distributing the focal powers of the lenses, the optical lens can achieve the advantages of miniaturization, low sensitivity, high yield, low production cost, and the like while satisfying high resolution. Secondly, the optical lens that this application provided possesses bigger diaphragm, even under the environment of low light, also can guarantee that the image possesses higher definition. Thirdly, the optical lens temperature performance that this application provided is good, works at high temperature and low temperature, and the imaging effect changes for a short time, and imaging quality is stable. In addition, the optical lens provided by the application ensures that the distance of the back focus is long enough under the condition that the total length of the lens is short, and is easy to assemble and adjust.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application;

fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application;

fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application;

fig. 4 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application;

fig. 5 shows a schematic structural diagram of an optical lens according to embodiment 5 of the present application; and

fig. 6 shows a schematic structural diagram of an optical lens according to embodiment 6 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface 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.

An optical lens according to an exemplary embodiment of the present application may include seven lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis.

The optical lens according to the exemplary embodiment of the present application 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).

The first lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface. The first lens can avoid the object space light from being excessively dispersed, is favorable for controlling the caliber of the rear lens, and realizes the miniaturization design of the optical lens. By arranging the first lens in a meniscus shape, it is possible to collect light rays of a large field of view as much as possible to enter the rear system, so that the amount of light flux can be effectively increased. In addition, the object side surface of the first lens is arranged to be convex, so that water drops can slide off in practical use environments (such as rainy and snowy weather), and the influence of severe environments on imaging can be effectively reduced. The first lens is preferably made of a material having a high refractive index and high hardness. The aspheric lens has a better curvature radius characteristic, and at least one or both of the object side surface and the image side surface of the first lens can be arranged into an aspheric mirror surface in use, so that the resolution quality of the lens is further improved.

The second lens element can have a negative optical power, and can have a concave object-side surface and a concave image-side surface.

The third lens may have a positive optical power. In an exemplary embodiment, both the object-side surface and the image-side surface of the third lens may be convex. In an exemplary embodiment, the object-side surface of the third lens element may be convex and the image-side surface may be concave. Alternatively, at least one or both of the object-side surface and the image-side surface of the third lens may be an aspherical mirror surface.

The fourth lens element can have a positive power, and has a convex object-side surface and a convex image-side surface. The fourth lens is arranged to be a biconvex lens, which is beneficial to converging light rays and smoothly transitioning the light rays to the rear lens. By controlling the effective focal length of the fourth lens, the light trend from the first lens to the fourth lens can be controlled, and the structure of the system is more compact. At least one of the object side surface and the image side surface of the fourth lens can be arranged as an aspheric mirror surface in use to further improve the resolution quality of the lens.

The fifth lens element can have a positive power, and can have a convex object-side surface and a convex image-side surface.

The sixth lens element can have a negative optical power, and can have a concave object-side surface and a concave image-side surface.

The seventh lens element may have a positive optical power, which facilitates converging and smooth transition of light passing through the front system to the image plane. The seventh lens is arranged in a meniscus shape, so that the Chief Ray Angle (Chief-Ray-Angle) of the system can be effectively controlled, and the seventh lens is matched with the chip better. At least one of the object-side surface and the image-side surface of the seventh lens is preferably arranged as an aspheric mirror surface in use to further improve the resolution quality of the lens.

As known to those skilled in the art, cemented lenses may be used to minimize or eliminate chromatic aberration. The use of the cemented lens in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby 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 third lens and the fourth lens may be combined into a cemented lens by cementing the image-side surface of the second lens with the object-side surface of the third lens. By introducing a cemented lens, it can help to reduce the air space between the lenses, making the overall system more compact; meanwhile, the assembling parts between the second lens and the third lens are reduced, so that the processing procedures can be reduced, and the cost of the optical lens is reduced; in addition, the tolerance sensitivity problems such as inclination, core deviation and the like generated in the assembling process of the lens unit can be reduced; moreover, the light quantity loss caused by reflection between the lenses can be reduced, and the illumination intensity is improved; secondly, the chromatic aberration can be eliminated, and the residual chromatic aberration can be eliminated to balance the chromatic aberration of the system. In the cemented lens, the second lens near the object side may have a negative power, and the third lens near the image side may have a positive power, which is advantageous for a smooth transition of light rays to the rear lens.

In addition, the fifth lens and the sixth lens can also be combined into a cemented lens by cementing the image-side surface of the fifth lens with the object-side surface of the sixth lens. By introducing a cemented lens, it can help to reduce the air space between the lenses, making the overall system more compact; meanwhile, the number of assembling parts between the fifth lens and the sixth lens is reduced, so that the processing procedures can be reduced, and the cost of the optical lens is reduced; in addition, the tolerance sensitivity problems such as inclination, core deviation and the like generated in the assembling process of the lens unit can be reduced; moreover, the light quantity loss caused by reflection between the lenses can be reduced, and the illumination intensity is improved; secondly, the chromatic aberration can be eliminated, and the residual chromatic aberration can be eliminated to balance the chromatic aberration of the system. In the cemented lens, the fifth lens near the object side may have a positive power, and the sixth lens near the image side may have a negative power, which is advantageous for a smooth transition of light rays to the rear lens.

By using the gluing piece, the whole chromatic aberration correction of the sharing system is facilitated, so that the chromatic aberration can be effectively corrected, and the resolution is improved. Moreover, after the glue assembly is used, the whole optical system can be compact, and the miniaturization requirement can be better met.

In an exemplary embodiment, a diaphragm may be disposed between the fourth lens and the fifth lens, for example, which is beneficial to increase the aperture of the diaphragm, so as to further improve the imaging quality of the lens barrel. The light entering the optical system can be effectively converged, and the aperture of the lens is reduced. It is to be understood that the stop position is not limited to the above-described position, and may be provided at any other position as needed, for example, the stop may also be provided between the third lens and the fourth lens.

Optionally, the optical lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image plane.

In an exemplary embodiment, the object side surface and the image side surface of at least one of the third lens, the fourth lens, and the seventh lens may be aspheric. 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. For example, at least two lenses among the third lens, the fourth lens and the seventh lens may adopt aspherical lenses to further improve the resolution quality. However, in order to improve the imaging quality, the number of aspherical lenses of the optical lens according to the present application may be increased. For example, in the case where the importance is placed on the resolution quality and reliability, the first to seventh lenses may each employ an aspherical lens, such as a glass aspherical lens.

In an exemplary embodiment, a total optical length TTL of the optical lens (i.e., a distance on an optical axis from a center of an object side surface of the first lens to an imaging surface of the optical lens) and a total effective focal length f of the optical lens may satisfy: TTL/f is less than or equal to 7.0. For example, TTL/f ≦ 6.0. The mutual relation between the total optical length of the optical lens and the total effective focal length of the optical lens is reasonably controlled, so that the total size of the optical lens can be effectively reduced while a larger focal length is obtained, and the ultrathin characteristic and the miniaturization of the long-focus optical lens are realized.

In an exemplary embodiment, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.05. For example, TTL/H/FOV ≦ 0.04. The mutual relation among the total optical length of the optical lens, the maximum field angle of the optical lens and the image height corresponding to the maximum field angle of the optical lens is reasonably controlled, the miniaturization of an optical system is facilitated, and the size of the optical lens can be effectively reduced under the condition that the imaging surfaces are the same and the image heights are the same.

In an exemplary embodiment, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: D/H/FOV is less than or equal to 0.03. For example, D/H/FOV ≦ 0.02. The maximum field angle of the optical lens, the maximum light-passing half aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens and the image height corresponding to the maximum field angle of the optical lens are reasonably controlled, and the small aperture of the front end of the optical lens can be ensured.

In an exemplary embodiment, the optical back focus BFL of the optical lens (i.e., the distance on the optical axis from the center of the image-side surface of the seventh lens to the imaging surface of the optical lens) and the total optical length TTL of the optical lens may satisfy: BFL/TTL is more than or equal to 0.15. For example, BFL/TTL ≧ 0.2. The ratio of the optical back focal length of the optical lens to the optical total length of the optical lens is controlled within a reasonable numerical range, so that the back focal length of the optical lens can be ensured on the basis of system miniaturization, and system assembly is facilitated.

In an exemplary embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens may satisfy: the absolute value of f5/f6 is more than or equal to 0.5 and less than or equal to 2.0. For example, 0.5. ltoreq. f5/f 6. ltoreq.1.5. By controlling the ratio of the effective focal lengths of the five lens and the sixth lens within a reasonable numerical range, the focal lengths of the two lenses in the cemented lens are close, which is helpful for smoothing and excessively smoothing light and correcting chromatic aberration of the system.

In an exemplary embodiment, a center thickness dn of an nth lens having a largest center thickness among the first to seventh lenses and a center thickness dm of an mth lens having a smallest center thickness among the first to seventh lenses may satisfy: 4.0 < dn/dm < 8.0, wherein n and m are selected from 1, 2, 3, 4, 5, 6 and 7. For example, 5.0. ltoreq. dn/dm. ltoreq.7.0, where n and m are selected from 1, 2, 3, 4, 5, 6, 7. Through the central thickness of each lens of rational control, can guarantee that the thickness of each lens is even, the effect is stable, helps guaranteeing that the system all has the imaging quality of preferred under the temperature condition of difference (promptly, high low temperature changes the deflection angle of light less) for the camera lens has the temperature performance of preferred.

In an exemplary embodiment, the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the optical lens may satisfy: and | f56/f | ≧ 2.0. For example, | f56/f | ≧ 3.0. The relationship between the combined focal length of the fifth lens and the sixth lens and the total effective focal length of the optical lens is reasonably controlled, the combined focal length of the cemented lens can be reasonably distributed, and the thermal compensation of the system is favorably realized.

In an exemplary embodiment, the total effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens may satisfy: (FOV xf)/H is less than or equal to 65.0. For example, (FOV xf)/H ≦ 60.0. The mutual relation among the total effective focal length of the optical lens, the maximum field angle of the optical lens and the image height corresponding to the maximum field angle of the optical lens is reasonably controlled, the system is favorably matched with a larger chip, and the characteristics of small distortion, long focus and the like are realized.

In an exemplary embodiment, the total optical length TTL of the optical lens and the separation distance d11 on the optical axis of the sixth lens and the seventh lens may satisfy: d11/TTL is more than or equal to 0.01. For example, d11/TTL ≧ 0.015. When the ratio of the total optical length of the optical lens to the air space of the sixth lens and the seventh lens on the optical axis is in a reasonable range, the sixth lens and the seventh lens can be separated by a reasonable distance, so that the risk of generating ghost images of the system is reduced, and the assembly of the system is facilitated.

In an exemplary embodiment, the maximum clear half-aperture D12 of the object-side surface of the seventh lens corresponding to the maximum field angle of the optical lens and the Sg value SAG12 corresponding to the maximum clear half-aperture D12, and the maximum clear half-aperture D13 of the image-side surface of the seventh lens corresponding to the maximum field angle of the optical lens and the Sg value SAG13 corresponding to the maximum clear half-aperture D13 may satisfy: 0.3 or less arctan (SAG12/D12)/arctan (SAG13/D13) or less than 3.0. For example, 0.5. ltoreq. arctan (SAG12/D12)/arctan (SAG 13/D13). ltoreq.2.0. The height loss and the maximum light-passing half aperture of the object side surface and the image side surface of the seventh lens are reasonably controlled, so that the edge field angles of the object side surface and the image side surface of the seventh lens are close to each other, peripheral light rays can be smoothly transited, and the reduction of the sensitivity of the seventh lens is facilitated.

In an exemplary embodiment, the refractive index Nd1 of the first lens may satisfy: nd1 is more than or equal to 1.6 and less than or equal to 1.9. For example, 1.65. ltoreq. Nd 1. ltoreq.1.85. The numerical value of the refractive index of the first lens is reasonably controlled, so that the first lens has a higher refractive index, and the front end caliber of the system is reduced, and the imaging quality is improved.

In an exemplary embodiment, the radius of curvature R1 of the first lens, the radius of curvature R2 of the second lens, and the central thickness d1 of the first lens on the optical axis may satisfy: R1/(R2+ CT1) is not less than 1.6. For example, R1/(R2+ d1) ≧ 2.0.

The optical lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, seven lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the incident light can be effectively converged, the optical total length of the optical lens is shortened, the processability of the optical lens is improved, and the optical lens is more favorable for production and processing. The optical lens according to the above-described embodiment of the present application can have characteristics such as high resolution, low cost, long back focus, excellent temperature performance, miniaturization, large aperture, small front end aperture, and simple structure with reasonable use of a cemented element.

However, it will be understood by those skilled in the art that the number of lenses constituting the optical lens may be varied to obtain the respective results and advantages described in the present specification without departing from the technical solutions claimed in the present application. For example, although seven lenses are exemplified in the embodiment, the optical lens is not limited to include seven 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 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens, in order from an object side to an image side along an optical axis, comprises: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop STO, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The first lens L1 is a meniscus lens with negative power, the object-side surface S1 is convex, the image-side surface S2 is concave, and both the object-side surface S1 and the image-side surface S2 of the first lens L1 are spherical.

The second lens L2 is a biconcave lens with negative power, the object-side surface S3 is concave, the image-side surface S4 is concave, and both the object-side surface S3 and the image-side surface S4 of the second lens L2 are spherical.

The third lens L3 is a meniscus lens with positive power, the object-side surface S4 is convex, the image-side surface S5 is concave, and both the object-side surface S4 and the image-side surface S5 of the third lens L3 are spherical.

The fourth lens element L4 is a biconvex lens with positive refractive power, and has a convex object-side surface S6 and a convex image-side surface S7, and both the object-side surface S6 and the image-side surface S7 of the fourth lens element L4 are aspheric.

The fifth lens element L5 is a biconvex lens with positive refractive power, and has a convex object-side surface S9 and a convex image-side surface S10, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are spherical surfaces.

The sixth lens L6 is a biconcave lens with negative power, the object-side surface S10 is concave, the image-side surface S11 is concave, and both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical.

The seventh lens L7 is a meniscus lens with positive power, the object-side surface S12 is concave, the image-side surface S13 is convex, and both the object-side surface S12 and the image-side surface S13 of the seventh lens L7 are aspheric.

In the present embodiment, the second lens L2 and the third lens L3 are cemented to constitute a first cemented lens. The fifth lens L5 and the sixth lens L6 are combined into a second cemented lens.

Optionally, the optical lens may further include a filter L8 having an object-side surface S14 and an image-side surface S15 and/or a protective glass L9 having an object-side surface S16 and an image-side surface S17. Filter L8 can be used to correct for color deviations. The protective glass L9 may be used to protect the image sensing chip on the imaging plane. Light from the object passes through each of the surfaces S1 to S17 in sequence and is finally imaged on the imaging plane IMA.

In the optical lens of the present embodiment, the stop STO may be disposed between the fourth lens L4 and the fifth lens L5 to further improve the imaging quality.

Table 1 shows a basic parameter table of the optical lens of embodiment 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In the present embodiment, the maximum field angle FOV of the optical lens is 94.6 °. Table 2 below shows the total effective focal length f of the optical lens of example 1, the total optical length TTL of the optical lens (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 to the imaging surface IMA), the image height H corresponding to the maximum field angle of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens corresponding to the maximum field angle of the optical lens, the optical back focus BFL of the optical lens (i.e., the distance on the optical axis from the center of the image-side surface S13 of the seventh lens to the imaging surface IMA), the maximum clear half aperture D12 of the object-side surface S12 of the seventh lens L7 corresponding to the maximum field angle of the IMA lens, the Sg 12 corresponding to the maximum clear half aperture D12, the maximum clear half aperture D13 of the image-side surface S13 of the seventh lens L7 corresponding to the maximum field angle of the optical lens, and the Sg 685 2 corresponding to the maximum clear half aperture value Sg 634, And an effective focal length f56 of a cemented lens composed of a fifth lens L5 and a sixth lens L6, wherein units of TTL, f, H, D, BFL, SAG12, D12, SAG13, D13, f56 are all millimeters (mm).

Parameter(s)	TTL	f	H	D	BFL	SAG12	D12	SAG13	D13	f56
											Numerical value	30.68	5.67	9.65	11.65	9.06	-0.56	3.62	-0.57	3.78	21.61

TABLE 2

In embodiment 1, the object-side surface and the image-side surface of each of the fourth lens L4 and the seventh lens L7 are aspheric, and the surface shape Z of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein Z 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 the conic coefficient conc; A. b, C, D, E, F are all high order term coefficients. Table 2 below shows the conic coefficients k and the respective high-order term coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S6, S7, S12 and S13 in example 1.

Flour mark

k

A

B

C

D

E

F

S6

-0.1190

3.6493E-06

9.4132E-06

-1.0052E-06

7.8095E-08

-2.8314E-09

4.4551E-11

S7

2.2492

4.4303E-04

7.9139E-06

-5.4714E-07

4.5119E-08

-1.6028E-09

2.6810E-11

S12

-1.7411

-1.7964E-03

4.8238E-07

-1.0240E-05

1.6131E-06

-8.4444E-08

1.6586E-09

S13

-46.0125

-4.4043E-03

6.1406E-04

-7.4503E-05

6.3451E-06

-2.8276E-07

5.2582E-09

TABLE 3

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. Fig. 2 is a schematic view showing a structure of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens, in order from an object side to an image side along an optical axis, comprises: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop STO, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

Table 4 shows a basic parameter table of the optical lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 4

In the present embodiment, the maximum field angle FOV of the optical lens is 94.6 °. Table 5 below shows the total effective focal length f of the optical lens of example 2, the total optical length TTL of the optical lens (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 to the imaging surface IMA), the image height H corresponding to the maximum field angle of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens corresponding to the maximum field angle of the optical lens, the optical back focus BFL of the optical lens (i.e., the distance on the optical axis from the center of the image-side surface S13 of the seventh lens to the imaging surface IMA), the maximum clear half aperture D12 of the object-side surface S12 of the seventh lens L7 corresponding to the maximum field angle of the IMA lens, the Sg 12 corresponding to the maximum clear half aperture D12, the maximum clear half aperture D13 of the image-side surface S13 of the seventh lens L7 corresponding to the maximum field angle of the optical lens, and the Sg 685 2 corresponding to the maximum clear half aperture value Sg 634, And an effective focal length f56 of a cemented lens composed of a fifth lens L5 and a sixth lens L6, wherein units of TTL, f, H, D, BFL, SAG12, D12, SAG13, D13, f56 are all millimeters (mm).

Parameter(s)	TTL	f	H	D	BFL	SAG12	D12	SAG13	D13	f56
											Numerical value	30.22	6.02	9.67	13.25	6.97	-0.50	3.64	-0.57	3.82	19.04

TABLE 5

In embodiment 2, both the object-side surface and the image-side surface of the fourth lens L4 and the seventh lens L7 are aspheric, and the surface shape Z of each aspheric lens can be defined using, but not limited to, formula (1) in embodiment 1. The conical coefficient k and the high-order term coefficients A, B, C, D, E and F which can be used for the respective aspherical mirror surfaces S6, S7, S12 and S13 in example 2 are shown in table 6 below.

Flour mark

k

A

B

C

D

E

F

S6

-0.1213

2.1874E-06

6.6088E-06

-6.2014E-07

4.1791E-08

-1.3059E-09

1.8619E-11

S7

2.2231

3.6076E-04

5.6562E-06

-3.3374E-07

2.4227E-08

-7.4568E-10

1.0955E-11

S12

-1.7860

-1.4597E-03

5.9567E-07

-6.2918E-06

8.6458E-07

-3.9305E-08

6.7912E-10

S13

-46.0804

-3.5734E-03

4.3396E-04

-4.5835E-05

3.3975E-06

-1.3164E-07

2.1231E-09

TABLE 6

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 is a schematic view showing a structure of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens, in order from an object side to an image side along an optical axis, comprises: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop STO, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The third lens element L3 is a biconvex lens with positive refractive power, and has a convex object-side surface S4 and a convex image-side surface S5, and both the object-side surface S4 and the image-side surface S5 of the third lens element L3 are spherical.

Table 7 shows a basic parameter table of the optical lens of example 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 7

In the present embodiment, the maximum field angle FOV of the optical lens is 94.6 °. Table 8 below shows the total effective focal length f of the optical lens of example 3, the total optical length TTL of the optical lens (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 to the imaging surface IMA), the image height H corresponding to the maximum field angle of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens corresponding to the maximum field angle of the optical lens, the optical back focus BFL of the optical lens (i.e., the distance on the optical axis from the center of the image-side surface S13 of the seventh lens to the imaging surface IMA), the maximum clear half aperture D12 of the object-side surface S12 of the seventh lens L7 corresponding to the maximum field angle of the IMA lens, the Sg 12 corresponding to the maximum clear half aperture D12, the maximum clear half aperture D13 of the image-side surface S13 of the seventh lens L7 corresponding to the maximum field angle of the optical lens, and the Sg 685 2 corresponding to the maximum clear half aperture value Sg 634, And an effective focal length f56 of a cemented lens composed of a fifth lens L5 and a sixth lens L6, wherein units of TTL, f, H, D, BFL, SAG12, D12, SAG13, D13, f56 are all millimeters (mm).

Parameter(s)	TTL	f	H	D	BFL	SAG12	D12	SAG13	D13	f56
											Numerical value	30.61	5.75	9.74	13.18	7.79	-0.40	3.36	-0.74	3.69	44.19

TABLE 8

In embodiment 3, both the object-side surface and the image-side surface of the fourth lens L4 and the seventh lens L7 are aspheric, and the surface shape Z of each aspheric lens can be defined using, but not limited to, formula (1) in embodiment 1. The conical coefficient k and the high-order term coefficients A, B, C, D, E and F which can be used for the respective aspherical mirror surfaces S6, S7, S12 and S13 in example 3 are given in table 9 below.

Flour mark

k

A

B

C

D

E

F

S6

0.3021

4.9267E-05

6.3012E-06

-6.7611E-07

6.8210E-08

-3.0284E-09

6.1602E-11

S7

0.8087

4.0602E-04

8.2887E-06

-1.0699E-06

1.2741E-07

-6.4435E-09

1.5569E-10

S12

-99.0001

-1.9651E-03

-4.2119E-07

-1.0525E-05

1.2487E-06

-5.4109E-08

1.4878E-09

S13

-34.4625

-4.6778E-03

5.7641E-04

-6.8406E-05

5.2948E-06

-2.1588E-07

3.8361E-09

TABLE 9

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 is a schematic view showing a structure of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens, in order from an object side to an image side along an optical axis, comprises: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop STO, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

Table 10 shows a basic parameter table of the optical lens of example 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

Watch 10

In the present embodiment, the maximum field angle FOV of the optical lens is 94.6 °. Table 11 below shows the total effective focal length f of the optical lens of example 4, the total optical length TTL of the optical lens (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 to the imaging surface IMA), the image height H corresponding to the maximum field angle of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens corresponding to the maximum field angle of the optical lens, the optical back focus BFL of the optical lens (i.e., the distance on the optical axis from the center of the image-side surface S13 of the seventh lens to the imaging surface IMA), the maximum clear half aperture D12 of the object-side surface S12 of the seventh lens L7 corresponding to the maximum field angle of the IMA lens, the Sg 12 corresponding to the maximum clear half aperture D12, the maximum clear half aperture D13 of the image-side surface S13 of the seventh lens L7 corresponding to the maximum field angle of the optical lens, and the Sg 685 2 corresponding to the maximum clear half aperture value Sg 634, And an effective focal length f56 of a cemented lens composed of a fifth lens L5 and a sixth lens L6, wherein units of TTL, f, H, D, BFL, SAG12, D12, SAG13, D13, f56 are all millimeters (mm).

Parameter(s)	TTL	f	H	D	BFL	SAG12	D12	SAG13	D13	f56
											Numerical value	30.58	5.60	9.67	11.88	9.08	-0.48	3.37	-0.79	3.68	61.22

TABLE 11

In embodiment 4, both the object-side surface and the image-side surface of the fourth lens L4 and the seventh lens L7 are aspheric, and the surface shape Z of each aspheric lens can be defined using, but not limited to, formula (1) in embodiment 1. The conical coefficient k and the high-order term coefficients A, B, C, D, E and F which can be used for the respective aspherical mirror surfaces S6, S7, S12 and S13 in example 4 are shown in table 12 below.

Flour mark

k

A

B

C

D

E

F

S6

0.3026

5.9650E-05

8.5244E-06

-1.0561E-06

1.1843E-07

-6.0274E-09

1.4509E-10

S7

0.8074

4.8939E-04

1.1340E-05

-1.6555E-06

2.2236E-07

-1.2883E-08

3.3454E-10

S12

-98.8084

-2.3824E-03

-1.8306E-06

-1.6560E-05

2.1137E-06

-1.1172E-07

3.2770E-09

S13

-34.6189

-5.6330E-03

7.8699E-04

-1.0581E-04

9.2338E-06

-4.3165E-07

8.6249E-09

TABLE 12

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 is a schematic view showing a structure of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens, in order from an object side to an image side along an optical axis, comprises: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

The third lens element L3 is a biconvex lens with positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6, and both the object-side surface S5 and the image-side surface S6 of the third lens element L3 are aspheric.

The fourth lens element L4 is a biconvex lens with positive refractive power, and has a convex object-side surface S8 and a convex image-side surface S9, and the object-side surface S8 and the image-side surface S9 of the fourth lens element L4 are both spherical.

The fifth lens element L5 is a biconvex lens with positive refractive power, and has a convex object-side surface S10 and a convex image-side surface S11, and both the object-side surface S10 and the image-side surface S11 of the fifth lens element L5 are spherical surfaces.

The sixth lens L6 is a biconcave lens with negative power, the object-side surface S11 is concave, the image-side surface S12 is concave, and both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are spherical.

The seventh lens L7 is a meniscus lens with positive power, the object-side surface S13 is convex, the image-side surface S14 is concave, and both the object-side surface S13 and the image-side surface S14 of the seventh lens L7 are aspheric.

In the present embodiment, the fifth lens L5 and the sixth lens L6 are combined into a cemented lens.

Optionally, the optical lens may further include a filter L8 having an object-side surface S15 and an image-side surface S16 and/or a protective glass L9 having an object-side surface S17 and an image-side surface S18. Filter L8 can be used to correct for color deviations. The protective glass L9 may be used to protect the image sensing chip on the imaging plane. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging plane IMA.

In the optical lens of the present embodiment, the stop STO may be disposed between the third lens L3 and the fourth lens L4 to further improve the imaging quality.

Table 13 shows a basic parameter table of the optical lens of example 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

Watch 13

In the present embodiment, the maximum field angle FOV of the optical lens is 94.6 °. Table 14 below shows the total effective focal length f of the optical lens of example 5, the total optical length TTL of the optical lens (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 to the imaging surface IMA), the image height H corresponding to the maximum field angle of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens corresponding to the maximum field angle of the optical lens, the optical back focus BFL of the optical lens (i.e., the distance on the optical axis from the center of the image-side surface S13 of the seventh lens to the imaging surface IMA), the maximum clear half aperture D12 of the object-side surface S12 of the seventh lens L7 corresponding to the maximum field angle of the IMA lens, the Sg 12 corresponding to the maximum clear half aperture D12, the maximum clear half aperture D13 of the image-side surface S13 of the seventh lens L7 corresponding to the maximum field angle of the optical lens, and the Sg 685 2 corresponding to the maximum clear half aperture value Sg 634, And an effective focal length f56 of a cemented lens composed of a fifth lens L5 and a sixth lens L6, wherein units of TTL, f, H, D, BFL, SAG12, D12, SAG13, D13, f56 are all millimeters (mm).

Parameter(s)	TTL	f	H	D	BFL	SAG12	D12	SAG13	D13	f56
											Numerical value	30.77	5.75	9.63	11.16	8.52	1.20	4.09	0.71	3.99	-46.14

TABLE 14

In embodiment 5, both the object-side surface and the image-side surface of the third lens L3 and the seventh lens L7 are aspheric, and the surface shape Z of each aspheric lens can be defined using, but not limited to, formula (1) in embodiment 1. The conical coefficient k and the high-order term coefficients A, B, C, D, E and F which can be used for the respective aspherical mirror surfaces S5, S6, S12 and S13 in example 4 are shown in table 12 below.

Flour mark

k

A

B

C

D

E

F

S5

0.1068

-1.7253E-04

3.6361E-06

3.4705E-07

-2.6530E-08

2.2956E-10

0

S6

-1.1257

1.8663E-04

-2.0339E-06

9.3137E-07

-4.2715E-08

3.8363E-10

0

S13

2.6202

1.0096E-03

7.4190E-06

-5.2419E-07

4.8129E-08

-1.5273E-09

0

S14

99.0000

2.1395E-03

4.7769E-05

-2.0480E-06

2.6035E-07

-8.4126E-09

0

Watch 15

Example 6

An optical lens according to embodiment 6 of the present application is described below with reference to fig. 6. Fig. 6 is a schematic view showing a structure of an optical lens according to embodiment 6 of the present application.

As shown in fig. 6, the optical lens, in order from an object side to an image side along an optical axis, comprises: a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

Table 16 shows a basic parameter table of the optical lens of example 6, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 16

In the present embodiment, the maximum field angle FOV of the optical lens is 94.6 °. Table 17 below shows the total effective focal length f of the optical lens of example 6, the total optical length TTL of the optical lens (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens L1 to the imaging surface IMA), the image height H corresponding to the maximum field angle of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens corresponding to the maximum field angle of the optical lens, the optical back focus BFL of the optical lens (i.e., the distance on the optical axis from the center of the image-side surface S13 of the seventh lens to the imaging surface IMA), the maximum clear half aperture D12 of the object-side surface S12 of the seventh lens L7 corresponding to the maximum field angle of the IMA lens, the Sg 12 corresponding to the maximum clear half aperture D12, the maximum clear half aperture D13 of the image-side surface S13 of the seventh lens L7 corresponding to the maximum field angle of the optical lens, and the Sg 685 2 corresponding to the maximum clear half aperture value Sg 634, And an effective focal length f56 of a cemented lens composed of a fifth lens L5 and a sixth lens L6, wherein units of TTL, f, H, D, BFL, SAG12, D12, SAG13, D13, f56 are all millimeters (mm).

Parameter(s)	TTL	f	H	D	BFL	SAG12	D12	SAG13	D13	f56
											Numerical value	30.31	5.69	9.65	10.96	8.35	1.19	4.11	0.72	3.79	-37.36

TABLE 17

In embodiment 6, both the object-side surface and the image-side surface of the third lens L3 and the seventh lens L7 are aspheric, and the surface shape Z of each aspheric lens can be defined using, but not limited to, formula (1) in embodiment 1. The conical coefficient k and the high-order term coefficients A, B, C, D, E and F which can be used for the respective aspherical mirror surfaces S5, S6, S12 and S13 in example 4 are shown in table 12 below.

Watch 18

In summary, examples 1 to 6 each satisfy the relationship shown in table 19.

Watch 19

The present application also provides an electronic device that may include the optical lens according to the above-described embodiments of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a stand-alone imaging device such as a vehicle-mounted camera, or may be an imaging module integrated on a driving assistance system such as a car.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

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

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

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

a third lens having a positive optical power;

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

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

a sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; and

a seventh lens having a positive optical power.

2. An optical lens according to claim 1, wherein the total optical length TTL of the optical lens and the total effective focal length f of the optical lens satisfy:

TTL/f≤7.0。

3. the optical lens according to claim 1, wherein an image height H corresponding to an optical total length TTL of the optical lens, a maximum field angle FOV of the optical lens, and the maximum field angle of the optical lens satisfies:

TTL/H/FOV≤0.05。

4. the optical lens according to claim 1, wherein the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height H corresponding to the maximum field angle of the optical lens satisfy:

D/H/FOV≤0.03。

5. an optical lens according to claim 1, wherein the optical back focus BFL of the optical lens and the total optical length TTL of the optical lens satisfy:

BFL/TTL≥0.15。

6. an optical lens according to claim 1, characterized in that the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy:

0.5≤|f5/f6|≤2.0。

7. an optical lens according to claim 1, wherein a center thickness dn of an nth lens having a largest center thickness among the first to seventh lenses and a center thickness dm of an mth lens having a smallest center thickness among the first to seventh lenses satisfy:

4.0 < dn/dm < 8.0, wherein n and m are selected from 1, 2, 3, 4, 5, 6 and 7.

8. An optical lens according to claim 1, characterized in that the combined focal length f56 of the fifth and sixth lenses and the total effective focal length f of the optical lens satisfy:

|f56/f|≥2.0。

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

a first lens element having a convex object-side surface and a concave image-side surface;

a second lens element having a concave object-side surface and a concave image-side surface;

a third lens;

a fourth lens element having a convex object-side surface and a convex image-side surface;

a fifth lens element having a convex object-side surface and a convex image-side surface;

a sixth lens element having a concave object-side surface and a concave image-side surface; and

a seventh lens;

wherein an optical total length TTL of the optical lens and a distance d11 between the sixth lens element and the seventh lens element on the optical axis satisfy:

d11/TTL≥0.01。

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