CN113805305A

CN113805305A - Optical lens and electronic device

Info

Publication number: CN113805305A
Application number: CN202010461091.4A
Authority: CN
Inventors: 王东方; 赵哲; 张润泽; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-12-17
Anticipated expiration: 2040-05-27
Also published as: CN113805305B

Abstract

The application discloses an optical lens and an electronic device including the same. The optical lens sequentially comprises from an object side to an image side along an optical axis: the image side surface of the first lens is a concave surface; a second lens having a negative refractive power, the object 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; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; the sixth lens with positive focal power has a convex object-side surface and a convex image-side surface; and a seventh 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 automobile driving assistance systems in recent years, lenses are more and more widely applied to automobiles, and people have higher and higher requirements on vehicle-mounted lens pixels. For safety reasons, the performance of optical lenses for vehicle-mounted applications is generally very demanding, and the performance of optical lenses for autonomous vehicles is more stringent. The lens of the autonomous vehicle has a very high demand for the pixel. Therefore, on the basis of the original vehicle-mounted optical lens, in order to improve the resolution capability of the optical lens applied to the automatic driving automobile, people usually select a lens structure with 8 or more pieces, but the miniaturization of the lens is seriously influenced.

The optical lens has higher requirement on stability, and requires less image height change under high and low temperature environments so as to avoid the performance reduction of the lens caused by the temperature difference of the lens. There is an ongoing need in the market for an optical lens that meets the requirements of automotive applications.

Disclosure of Invention

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

In one embodiment, the object side surface of the first lens is convex.

In one embodiment, the object side surface of the first lens is concave.

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

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

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

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

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

In one embodiment, the seventh lens has a negative power and its image side surface is concave in a region near the optical axis. In one embodiment, the seventh lens has a negative power and the object side surface is convex in a region near the optical axis.

In one embodiment, the seventh lens has a negative power and the object side surface is concave in a region near the optical axis.

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

In one embodiment, the edge region of the object side or the image side of the seventh lens has at least one inflection point.

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

In one embodiment, at least two of the third lens, the fourth lens, and the seventh lens have aspherical mirror surfaces.

In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens may satisfy: TTL/F is less than or equal to 6.5.

In one embodiment, a distance TTL from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, an image height H corresponding to a maximum field angle FOV of the optical lens, and the maximum field angle FOV of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.1.

In one embodiment, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle FOV of the optical lens, the image height H corresponding to the maximum field angle FOV of the optical lens, and the maximum field angle FOV of the optical lens may satisfy: D/H/FOV is less than or equal to 0.035.

In one embodiment, the effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens may satisfy: F3/F4 is more than or equal to 0.5 and less than or equal to 1.8.

In one embodiment, the separation distance T34 between the third lens and the fourth lens on the optical axis and the total effective focal length F of the optical lens can satisfy: T34/F is more than or equal to 0 and less than or equal to 0.1.

In one embodiment, the central radius of curvature R8 of the object-side surface of the fourth lens and the central radius of curvature R9 of the image-side surface of the fourth lens may satisfy: the ratio of R8 to R9 is less than or equal to 1.5.

In one embodiment, the effective focal length F56 of the cemented lens formed by the fifth lens and the sixth lens cemented together and the total effective focal length F of the optical lens may satisfy: F56/F is more than or equal to 1.5 and less than or equal to 7.

In one embodiment, the separation distance T67 between the sixth lens and the seventh lens on the optical axis and the total effective focal length F of the optical lens can satisfy: T67/F is more than 0 and less than or equal to 1.2.

In one embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle FOV of the optical lens may satisfy: (FOV F)/H.gtoreq.45.

In one embodiment, the effective focal length F6 of the sixth lens and the temperature coefficient of refractive index dn/dt (6) of the sixth lens satisfy: -5.5X 10⁵≤F6/(dn/dt(6))≤-2.5×10⁵。

Another aspect of the present application provides such an optical lens. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; and a seventh lens having optical power. The distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens can meet the following requirements: TTL/F is less than or equal to 6.5.

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.

This application has adopted five lens, through optimizing shape, the focal power etc. that sets up each lens, makes optical lens have at least one beneficial effect such as high resolution, miniaturization, low cost, temperature performance are good.

Drawings

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

fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic structural view showing an optical lens according to embodiment 2 of the present application;

fig. 3 is a schematic structural view showing an optical lens according to embodiment 3 of the present application;

fig. 4 is a schematic structural view showing an optical lens according to embodiment 4 of the present application;

fig. 5 is a schematic structural view showing an optical lens according to embodiment 5 of the present application;

fig. 6 is a schematic structural view showing an optical lens according to embodiment 6 of the present application;

fig. 7 is a schematic structural view showing an optical lens according to embodiment 7 of the present application;

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

fig. 9 is a schematic structural view showing an optical lens according to embodiment 9 of the present application;

fig. 10 is a schematic structural view showing an optical lens according to embodiment 10 of the present application;

fig. 11 is a schematic structural view showing an optical lens according to embodiment 11 of the present application; and

fig. 12 is a schematic view showing a structure of an optical lens according to embodiment 12 of the present application.

Detailed Description

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

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

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

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

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles and other aspects of the present application are described in detail below.

In an exemplary embodiment, the optical lens includes, for example, 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 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 or a concave type. The arrangement of the focal power and the surface type of the first lens is beneficial to collecting more large-field light rays to enter a rear optical system, so that the light flux is increased.

In an exemplary embodiment, the second lens may have a negative power. The second lens may have a concave-convex surface type or a concave-concave surface type. The arrangement of the focal power and the surface type of the second lens is beneficial to collecting the light rays emitted by the first lens, so that the light rays are in smooth transition.

In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a convex-convex type, a convex-concave type, or a concave-convex type. The focal power and the surface type arrangement of the third lens are beneficial to light convergence. The third lens is preferably made of a material with a high refractive index (Nd3 is more than or equal to 1.65), which is beneficial to reducing the aperture of the front end and improving the imaging quality.

In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex type. The focal power and the surface shape of the fourth lens are arranged, so that light rays are converged, the caliber and the barrel length of the optical lens barrel are reduced, and the miniaturization of the lens is facilitated.

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

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

In an exemplary embodiment, the seventh lens may have a negative power. The seventh lens may have a convex concave type or a concave type in a region near the optical axis.

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

In an exemplary embodiment, an edge region of the object side or the image side of the seventh lens may have at least one inflection point. The surface type arrangement of the seventh lens is beneficial to smoothing the trend of front light and improving the resolution quality.

In an exemplary embodiment, at least two lenses among the third lens, the fourth lens, and the seventh lens may have aspherical mirror surfaces. The third lens, the fourth lens or the seventh lens is preferably a lens with an aspheric mirror surface, so that the resolution quality of the lens can be further improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 6.5, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F further satisfy: TTL/F is less than or equal to 6. The TTL/F is less than or equal to 6.5, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/FOV is less than or equal to 0.1, wherein TTL is the distance between 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 FOV of the optical lens, and the FOV is the maximum field angle of the optical lens. More specifically, TTL, H, and FOV further satisfy: TTL/H/FOV is less than or equal to 0.08. The TTL/H/FOV is less than or equal to 0.1, the miniaturization is favorably realized, and the size can be smaller under the conditions of the same imaging surface and the same image height.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.035, wherein D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle FOV of the optical lens, H is the image height corresponding to the maximum field angle FOV of the optical lens, and FOV is the maximum field angle of the optical lens. More specifically, D, H and the FOV further satisfy: D/H/FOV is less than or equal to 0.03. Satisfies the requirement that D/H/FOV is less than or equal to 0.035, is beneficial to reducing the diameter of the front port and realizes miniaturization.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F3/F4 is more than or equal to 0.5 and less than or equal to 1.8, wherein F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens. More specifically, F3 and F4 may further satisfy: F3/F4 is more than or equal to 0.8 and less than or equal to 1.5. F3/F4 of 0.5-1.8 are satisfied, which is helpful for smooth transition of light and correction of chromatic aberration.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0 ≦ T34/F ≦ 0.1, where T34 is a separation distance of the third lens and the fourth lens on the optical axis, and F is a total effective focal length of the optical lens. More specifically, T34 and F further satisfy: T34/F is more than or equal to 0 and less than or equal to 0.06. T34/F is more than or equal to 0 and less than or equal to 0.1, so that the fourth lens can collect more light rays, the system is compact, and the miniaturization is realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.2 ≦ T34/F ≦ 0.3, where T34 is the separation distance on the optical axis of the third lens and the fourth lens, and F is the total effective focal length of the optical lens. T34/F is more than or equal to 0.2 and less than or equal to 0.3, so that the fourth lens can collect more light rays, the system is compact, and the miniaturization is realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R8/R9| ≦ 1.5, wherein R8 is the central radius of curvature of the object-side surface of the fourth lens, and R9 is the central radius of curvature of the image-side surface of the fourth lens. More specifically, R8 and R9 may further satisfy: the ratio of R8 to R9 is less than or equal to 1.2. Satisfying R8/R9| ≦ 1.5, can correct the aberration of the optical system, reduce the tolerance sensitivity of the optical system.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F56/F is more than or equal to 1.5 and less than or equal to 7, wherein F56 is the effective focal length of the cemented lens formed by the fifth lens and the sixth lens, and F is the total effective focal length of the optical lens. More specifically, F56 and F further satisfy: F56/F is more than or equal to 2 and less than or equal to 6.5. Satisfying 1.5 ≦ F56/F ≦ 7, which helps to achieve thermal compensation.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0 < T67/F ≦ 1.2, where T67 is the separation distance between the sixth lens and the seventh lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, T67 and F further satisfy: T67/F is more than or equal to 0.2 and less than or equal to 1. T67/F is more than 0 and less than or equal to 1.2, which is beneficial to enabling the light to be smoothly transited to the seventh lens and collecting more light as much as possible.

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 45, wherein FOV is the maximum field angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle FOV of the optical lens. More specifically, FOV, F and H further satisfy: (FOV F)/H.gtoreq.50. The condition that (FOV multiplied by F)/H is more than or equal to 45 is met, the realization of a large field angle and high resolution is facilitated, the identification degree of the optical lens to an environmental object can be improved, and the detection area of the central part can be increased in a targeted manner.

In an exemplary embodiment, an optical lens according to the present application may satisfy: -5.5X 10⁵≤F6/(dn/dt(6))≤-2.5×10⁵Wherein F6 is the effective focal length of the sixth lens, and dn/dt (6) is the temperature coefficient of refractive index of the sixth lens. More specifically, F6 and (dn/dt (6)) may further satisfy: -5X 10⁵≤F6/(dn/dt(6))≤-3×10⁵. satisfies-5.5X 10⁵≤F6/(dn/dt(6))≤-2.5×10⁵The optical lens is beneficial to reducing the deflection change of light rays under high and low temperature so as to improve the temperature performance of the lens.

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, and the aperture of the lens is reduced. In the embodiment of the present application, the stop may be disposed in the vicinity of the image side surface of the third lens or in the vicinity of the object side surface of the fourth lens. It should be noted, however, that the positions of the diaphragms disclosed herein are merely examples and not limitations; in alternative embodiments, the diaphragm may be disposed at other positions according to actual needs.

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

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

In an exemplary embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens. The fifth lens with the concave object-side surface and the concave image-side surface is glued with the sixth lens with the convex object-side surface and the convex image-side surface, so that light rays emitted by the fifth lens can be smoothly transited to an imaging surface, the total length of an optical system is reduced, various aberrations of the optical system can be corrected, the system resolution is improved, and the optical performances such as distortion and CRA (cross-correlation coefficient) are optimized on the premise that the optical system is compact in structure. 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 so as to improve the resolving power, and enables the optical system to be compact as a whole and meet the miniaturization requirement. The above cemented lens is preferably an aspherical lens to further improve the resolution quality.

In an exemplary embodiment, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens may have an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. The aspheric lens helps to correct system aberration and improve resolving power. Specifically, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspheric lens, which is beneficial to improving the resolution quality of the optical system.

According to the optical lens of the above embodiment of the application, through reasonable setting of the shapes and focal powers of the lenses, under the condition that only 7 lenses are used, at least one beneficial effect that the optical system has long focus, high resolution (more than eight million pixels can be achieved), good imaging quality and the like is achieved. Meanwhile, the optical system also meets the requirements of small lens size, low sensitivity and high production yield and low cost. 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 the advantages of good temperature adaptability, small change of imaging effect in high and low temperature environments, stable image quality and contribution to accurate distance measurement of the binocular lens.

According to the optical lens of the embodiment of the application, the cemented lens is arranged, the whole chromatic aberration correction of the system is shared, the system aberration is corrected, the system resolution quality is improved, the matching sensitivity problem is reduced, the whole structure of the optical system is compact, and the miniaturization requirement is met.

In an exemplary embodiment, the first to seventh lenses in the optical lens may each be made of glass. The optical lens made of glass can inhibit the deviation of the back focus of the optical lens along with the temperature change so as to improve the stability of the system. Meanwhile, the glass material is adopted, so that the problem that the normal use of the lens is influenced due to the imaging blur of the lens caused by high and low temperature changes in the use environment can be avoided. Specifically, when the importance is paid to the resolution quality and the reliability, the first lens to the seventh lens may be all glass aspherical lenses. Of course, in the application where the requirement of temperature stability is low, the first lens to the seventh lens in the optical lens can also be made of plastic. The optical lens is made of plastic, so that the manufacturing cost can be effectively reduced.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although 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 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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex 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. The seventh lens L7 has negative power and is a biconcave lens in the region near the optical axis, with the object-side surface S13 being concave in the region near the optical axis and the image-side surface S14 being concave in the region near the optical axis. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the object side S8 of the fourth lens L4.

Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side S15 and an image side S16, the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensing chip IMA located at the imaging plane S17. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 1 shows a radius of curvature R, a thickness T (it is understood that the thickness T of the row in which S1 is located is the center thickness of the first lens L1, the thickness T of the row in which S2 is located is the separation distance T12 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 S13 and the image-side surface S14 of the seventh lens L7 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 conic coefficients k and the high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each of the aspherical mirror surfaces S5, S6, S13 and S14 in example 1.

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S5

-7.7526

3.9817E-04

2.9305E-05

-2.4936E-06

3.3081E-07

-1.9548E-08

4.0296E-10

3.6473E-12

S6

-2.8655

4.5707E-04

-1.3008E-05

7.9378E-06

-1.1326E-06

9.6433E-08

-4.1912E-09

7.7192E-11

S13

169.4169

-5.8553E-03

2.2423E-04

-2.2984E-05

3.7571E-06

-3.7140E-07

1.9307E-08

-3.2187E-10

S14

-35.7421

-3.7157E-03

-9.6648E-05

3.2736E-05

-3.1642E-06

1.8319E-07

-6.0764E-09

8.7983E-11

TABLE 2

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. Fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens 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, a sixth lens element L6, and a seventh lens element L7.

Table 3 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2. Table 4 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S5

17.3862

-7.6605E-04

3.3727E-05

-2.7226E-06

3.1577E-07

-1.9665E-08

4.1594E-10

7.3810E-13

S6

5.6058

4.2990E-04

-2.0771E-05

7.7361E-06

-1.1322E-06

9.6727E-08

-4.1840E-09

7.5306E-11

S13

316.3726

-6.2466E-03

2.0548E-04

-2.5043E-05

3.4175E-06

-3.9585E-07

1.8685E-08

-2.1171E-10

S14

-45.5809

-3.3077E-03

-1.2611E-04

2.9875E-05

-3.2429E-06

1.8356E-07

-5.9237E-09

9.4325E-11

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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a convex-concave lens with positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex 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. The seventh lens L7 has negative power and is a convex-concave lens in the region close to the optical axis, and has a convex object-side surface S13 in the region close to the optical axis and a concave image-side surface S14 in the region close to the optical axis. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 5 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3. Table 6 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

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, a sixth lens element L6, and a seventh lens element L7.

Table 7 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4. Table 8 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S5

1.9945

8.1088E-05

1.4190E-05

-2.3781E-06

2.7551E-07

-1.9116E-08

6.9458E-10

-1.0427E-11

S6

35.3000

1.0205E-03

-1.0127E-05

8.0678E-06

-1.1811E-06

9.6683E-08

-4.0670E-09

6.8949E-11

S13

32.0000

-6.0289E-03

3.0454E-04

-2.9600E-05

3.8201E-06

-3.5339E-07

1.7811E-08

-5.7428E-10

S14

-20.9578

-3.0968E-03

-1.1520E-04

2.9599E-05

-3.0633E-06

1.8082E-07

-5.8714E-09

8.1406E-11

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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a concave-convex lens with negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex 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. The seventh lens L7 has negative power and is a convex-concave lens in the region close to the optical axis, and has a convex object-side surface S13 in the region close to the optical axis and a concave image-side surface S14 in the region close to the optical axis. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 9 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5. Table 10 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S5

439.3707

5.8847E-04

3.7542E-05

-2.5488E-06

2.8159E-07

-1.6931E-08

5.1152E-10

-6.1032E-12

S6

-2.5267

4.6353E-04

-2.9857E-06

7.7882E-06

-1.1200E-06

9.6610E-08

-4.2184E-09

7.5337E-11

S13

90.0000

-4.7939E-03

5.4518E-05

-1.7501E-05

3.7503E-06

-4.0063E-07

1.9346E-08

-3.6429E-10

S14

-10.7583

-2.8335E-03

-1.2589E-04

3.0041E-05

-3.1451E-06

1.8420E-07

-6.2564E-09

9.5870E-11

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, a sixth lens element L6, and a seventh lens element L7.

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

TABLE 11

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S5

298.0000

6.9847E-04

3.6542E-05

-2.5488E-06

2.8159E-07

-1.6931E-08

5.1152E-10

-6.1032E-12

S6

-2.6267

4.9353E-04

-2.9857E-06

7.6882E-06

-1.1200E-06

9.6610E-08

-4.2184E-09

7.5337E-11

S13

100.5000

-4.7939E-03

5.1518E-05

-1.7301E-05

3.7503E-06

-4.0063E-07

1.9346E-08

-3.6429E-10

S14

-10.8583

-2.8135E-03

-1.2589E-04

3.0041E-05

-3.1451E-06

1.8420E-07

-6.2564E-09

9.5870E-11

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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a convex-concave lens with positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex 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. The seventh lens L7 has negative power and is a convex-concave lens in the region close to the optical axis, and has a convex object-side surface S13 in the region close to the optical axis and a concave image-side surface S14 in the region close to the optical axis. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

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

Watch 13

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, a sixth lens element L6, and a seventh lens element L7.

Table 15 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 8. Table 16 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 15

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S5

2.9397

8.5636E-05

1.3205E-05

-2.7968E-06

2.8000E-07

-1.8533E-08

6.2934E-10

-9.6181E-12

S6

49.8000

1.3423E-03

-4.6858E-06

8.1211E-06

-1.1612E-06

9.4517E-08

-3.9792E-09

6.7487E-11

S13

-9.5491

-6.8337E-03

1.9445E-04

-2.2885E-05

3.6543E-06

-3.6095E-07

1.8125E-08

-3.6428E-10

S14

-10.4265

-1.8289E-03

-2.1502E-04

3.7191E-05

-3.3043E-06

1.7187E-07

-4.9332E-09

6.0244E-11

TABLE 16

Example 9

An optical lens according to embodiment 9 of the present application is described below with reference to fig. 9. Fig. 9 shows a schematic structural diagram of an optical lens according to embodiment 9 of the present application.

As shown in fig. 9, 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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex 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. The seventh lens L7 is a meniscus lens having positive refractive power, and has a concave object-side surface S13 and a convex image-side surface S14. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 17 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 9. Table 18 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 17

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S5

-7.7526

3.8817E-04

2.9305E-05

-2.4853E-06

3.3167E-07

-1.9473E-08

4.0857E-10

3.9807E-12

S6

-2.8788

4.4707E-04

-1.3008E-05

7.9412E-06

-1.1323E-06

9.6463E-08

-4.1887E-09

7.7372E-11

S13

169.3760

-5.7553E-03

2.2423E-04

-2.2903E-05

3.7604E-06

-3.7133E-07

1.9300E-08

-3.2318E-10

S14

-33.0309

-3.8157E-03

-9.6648E-05

3.2695E-05

-3.1652E-06

1.8319E-07

-6.0725E-09

8.8410E-11

Watch 18

Example 10

An optical lens according to embodiment 10 of the present application is described below with reference to fig. 10. Fig. 10 shows a schematic structural diagram of an optical lens according to embodiment 10 of the present application.

As shown in fig. 10, 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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a concave-convex lens with negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex 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. The seventh lens L7 has a positive meniscus lens, and the object-side surface S13 is concave and the image-side surface S14 is convex. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 19 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 10. Table 20 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 10, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 19

Watch 20

Example 11

An optical lens according to embodiment 11 of the present application is described below with reference to fig. 11. Fig. 11 shows a schematic structural diagram of an optical lens according to embodiment 11 of the present application.

As shown in fig. 11, 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, a sixth lens element L6, and a seventh lens element L7.

The first lens L1 is a convex-concave lens with negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a meniscus lens with positive refractive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex 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. The seventh lens L7 has a negative power convex-concave lens, and has a convex object-side surface S13 and a concave image-side surface S14. The fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Optionally, the optical lens may further include a filter L8 having an object side S15 and an image side S16, and a protective glass L9 having an object side S17 and an image side S18, the filter L8 may be used to correct color deviation and the protective glass L9 may be used to protect the image sensing chip IMA located at the image side S19. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

Table 21 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 11. Table 22 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 11, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 21

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S8

0.0007

-2.3663E-04

2.5574E-05

-6.0277E-06

7.9134E-07

-5.8041E-08

2.2267E-09

-3.3844E-11

S9

7.6713

-5.1839E-07

1.3665E-05

-1.6583E-06

2.2623E-07

-1.6550E-08

6.5530E-10

-9.4280E-12

S13

92.2384

-4.1871E-03

1.1283E-05

-2.2303E-06

-9.0483E-09

3.4194E-08

-4.8833E-09

1.8485E-10

S14

-87.3859

-3.3068E-04

-5.0274E-04

7.6779E-05

-7.6328E-06

4.7177E-07

-1.6351E-08

2.4128E-10

TABLE 22

Example 12

An optical lens according to embodiment 12 of the present application is described below with reference to fig. 12. Fig. 12 is a schematic structural diagram showing an optical lens according to embodiment 12 of the present application.

As shown in fig. 12, 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, a sixth lens element L6, and a seventh lens element L7.

Table 23 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 12. Table 24 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 12, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 23

Flour mark

k

A4

A6

A8

A10

A12

A14

A16

S8

0.0054

-2.4656E-04

2.6335E-05

-6.0155E-06

7.9180E-07

-5.8040E-08

2.2286E-09

-3.4100E-11

S9

7.4503

1.9961E-06

1.1128E-05

-1.6271E-06

2.2917E-07

-1.6542E-08

6.2986E-10

-8.5789E-12

S13

90.2384

-4.3292E-03

2.0779E-05

-3.5424E-06

4.1703E-08

3.6771E-08

-5.0577E-09

1.8363E-10

S14

-85.3859

-3.2034E-04

-5.0102E-04

7.6684E-05

-7.6319E-06

4.7176E-07

-1.6344E-08

2.4104E-10

Watch 24

In summary, examples 1 to 12 satisfy the relationships shown in the following tables 25-1 and 25-2, respectively. In tables 25-1 and 25-2, units of TTL, F, H, D, F1, F2, F3, F4, F5, F6, F7, F56, T34 are millimeters (mm), and units of FOV are degrees (°).

TABLE 25-1

TABLE 25-2

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

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

Claims

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

the image side surface of the first lens is a concave surface;

a second lens having a negative refractive power, the object 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;

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

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

a seventh lens having optical power.

2. An optical lens barrel according to claim 1, wherein the object side surface of the first lens is convex.

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

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

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

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

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

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

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

a first lens having a negative optical power;

a second lens having a negative optical power;

a third lens having a positive optical power;

a fourth lens having a positive optical power;

a fifth lens having a negative optical power;

a sixth lens having positive optical power; and

a seventh lens having optical power;

the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens meet the following requirements: TTL/F is less than or equal to 6.5.

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.