CN113759496A

CN113759496A - Optical lens and electronic device

Info

Publication number: CN113759496A
Application number: CN202010461092.9A
Authority: CN
Inventors: 章鲁栋; 岳国强; 王东方; 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: 2021-12-07

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 first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens having a positive optical power; a third lens with negative focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; 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 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. Meanwhile, more and more manufacturers of vehicle-mounted lenses are also gradually beginning to research vehicle-mounted forward-looking optical lenses stable at high and low temperatures. For safety reasons, the performance requirements of forward-looking optical lenses for vehicle applications are often very high. Due to the high demands on miniaturization and higher pixels of the front-view lenses for vehicle applications. Therefore, lens manufacturers usually choose 6, 7 or more lens structures to improve the resolution capability based on the original vehicle-mounted optical lens, which seriously affects the miniaturization of the lens.

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 vehicle-mounted forward-looking 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 first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens having a positive optical power; a third lens with negative focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; 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 optical power.

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

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

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

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

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

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

In one embodiment, the third 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 5.5.

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

In one embodiment, the 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 0.08.

In one 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 0.8 and less than or equal to 2.

In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens may satisfy: the absolute value of F1/F is more than or equal to 1 and less than or equal to 3.

In one embodiment, the effective focal length F1 of the first lens and the effective focal length F2 of the second lens may satisfy: the absolute value of F1/F2 is more than or equal to 0.1 and less than or equal to 2.

In one embodiment, the central radius of curvature R3 of the object-side surface of the second lens and the central radius of curvature R4 of the image-side surface of the second lens may satisfy: and l (R3-R4)/(R3+ R4) l is less than or equal to 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: and | F56/F | ≧ 3.

In one embodiment, the central radius of curvature R1 of the object-side surface of the first lens and the central radius of curvature R2 of the image-side surface of the first lens may satisfy: the absolute value of R1/R2 is more than or equal to 0.5 and less than or equal to 6.5.

In one embodiment, the total effective focal length F of the optical lens and the central radius of curvature R1 of the object side of the first lens may satisfy: the absolute value of F/R1 is more than or equal to 0.25 and less than or equal to 0.8.

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.50.

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 0.15.

In one embodiment, the central radius of curvature R3 of the object-side surface of the second lens and the central radius of curvature R4 of the image-side surface of the second lens may satisfy: and the | R3/R4| is more than or equal to 2.

The application further provides an optical lens. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having a positive optical power; a third lens having a negative optical power; a fourth lens having a positive optical power; a fifth lens having a positive optical power; a sixth lens having a negative optical power; and a seventh lens having optical power. The total effective focal length F of the optical lens and the central curvature radius R1 of the object side surface of the first lens can satisfy the following conditions: the absolute value of F/R1 is more than or equal to 0.25 and less than or equal to 0.8.

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; and

fig. 11 is a schematic view showing a structure of an optical lens according to embodiment 11 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. The first lens may have a spherical mirror surface. The arrangement of the focal power and the surface type of the first lens is beneficial to enabling light rays to accurately and stably enter a rear light system, the resolving power is improved, the large-view-field light rays are collected as far as possible to enter the rear optical system, and the light transmission quantity is increased. The first lens is provided with a spherical mirror surface, so that the processing cost can be reduced while a waterproof film is coated.

In an exemplary embodiment, the second lens may have a positive optical power. The second lens may have a convex or concave-convex type. The arrangement of the focal power and the surface type of the second lens is beneficial to light convergence, reduces the caliber and the total length of the optical lens and is beneficial to realizing miniaturization.

In an exemplary embodiment, the third lens may have a negative power. The third lens may have a meniscus type. The focal power and the surface shape of the third lens are favorable for light convergence, the caliber and the total length of the optical lens are reduced, and the miniaturization is favorably realized.

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 favorable for light convergence, the caliber and the total length of the optical lens are reduced, and the miniaturization is favorably realized.

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

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

In exemplary embodiments, the seventh lens may have a positive power or a negative power. The seventh lens may have a convex type, a concave-convex type, or a convex-concave type. Alternatively, the seventh lens may have an aspherical mirror surface. The arrangement of the focal power and the surface type of the seventh lens is beneficial to smoothing the trend of front rays and improving the resolution capability.

In an exemplary embodiment, the third lens and the seventh lens may have aspherical mirror surfaces. The third lens and the seventh lens are provided with aspheric mirror surfaces, so that the resolution quality of the optical system is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 5.5, 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 more than or equal to 2 and less than or equal to 5. The TTL/F is less than or equal to 5.5, the total length of the lens can be effectively limited, and the miniaturization of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and the BFL/TTL is more than or equal to 0.06, wherein the BFL is the distance from the image side surface of the seventh lens element to the imaging surface of the optical lens on the optical axis, and the TTL is the distance from the object side surface of the first lens element to the imaging surface of the optical lens on the optical axis. More specifically, BFL and TTL further satisfy: BFL/TTL is more than or equal to 0.07 and less than or equal to 0.12. The BFL/TTL is more than or equal to 0.06, so that the back focus BFL of the optical lens is longer on the basis of realizing miniaturization, and the assembly of a module is facilitated. The total length TTL of the optical lens is controlled to be short, so that the structure of the optical lens is compact, the sensitivity of the lens to MTF is reduced, the production yield is improved, and the production cost is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.08, 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 0.05. The D/H/FOV is less than or equal to 0.08, the diameter of the front port can be smaller, and the miniaturization of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F5/F6| is less than or equal to 0.8 and less than or equal to 2, wherein F5 is the effective focal length of the fifth lens, and F6 is the effective focal length of the sixth lens. More specifically, F5 and F6 may further satisfy: the absolute value of F5/F6 is more than or equal to 1.5. The condition that the absolute value of F5/F6 is less than or equal to 2 is met, light is smoothly transited, and chromatic aberration is corrected.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F1/F | is less than or equal to 1 and less than or equal to 3, wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens. More specifically, F1 and F further satisfy: the absolute value of F1/F is more than or equal to 1.2 and less than or equal to 2. The condition that | F1/F | is more than or equal to 1 and less than or equal to 3 is met, more light rays can enter stably, and the illumination is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F1/F2| is less than or equal to 0.1 and less than or equal to 2, wherein F1 is the effective focal length of the first lens, and F2 is the effective focal length of the second lens. More specifically, F1 and F2 may further satisfy: the absolute value of F1/F2 is more than or equal to 0.2 and less than or equal to 1. The condition that the absolute value of F1/F2 is less than or equal to 0.1 is less than or equal to 2, light concentration is facilitated, and image quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and l (R3-R4)/(R3+ R4) | 5 or less, wherein R3 is the central radius of curvature of the object-side surface of the second lens, and R4 is the central radius of curvature of the image-side surface of the second lens. More specifically, R3 and R4 may further satisfy: and l (R3-R4)/(R3+ R4) l is less than or equal to 3.5. Satisfying | (R3-R4)/(R3+ R4) | ≦ 5, the aberration of the optical system may be corrected, and the light passing through the first lens may be ensured to be gentle, thereby reducing the tolerance sensitivity of the optical system.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F56/F | ≧ 3, wherein F56 is the effective focal length of the cemented lens formed by the fifth lens and the sixth lens cemented together, and F is the total effective focal length of the optical lens. More specifically, F56 and F further satisfy: and | F56/F | ≧ 5. The requirement that the absolute value of F56/F is more than or equal to 3 is met, thermal compensation is facilitated, good temperature performance is obtained, and the optical lens system is favorably ensured to have good resolving power at high and low temperatures.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.5 ≦ R1/R2 ≦ 6.5, where R1 is the central radius of curvature of the object-side surface of the first lens and R2 is the central radius of curvature of the image-side surface of the first lens. More specifically, R1 and R2 may further satisfy: the absolute value of R1/R2 is more than or equal to 1.5 and less than or equal to 6. The absolute value of R1/R2 is more than or equal to 0.5 and less than or equal to 6.5, thereby being beneficial to the smooth entering of light and improving the resolution power.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.25 ≦ F/R1 ≦ 0.8, where F is the total effective focal length of the optical lens and R1 is the center radius of curvature of the object side of the first lens. More specifically, F and R1 further satisfy: the | | | F/R1| | is not less than 0.24 and not more than 0.6. Satisfy | | | F/R1| | is less than or equal to 0.8 more than or equal to 0.25, can avoid the first lens object side curvature problem too little to effectively avoid the production of aberration when the light incides, and be favorable to the preparation of first lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV multiplied by F)/H is more than or equal to 50, 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.52. Satisfying (FOV multiplied by F)/H is more than or equal to 50, which is beneficial to realizing the characteristics of large field angle and high resolution, and simultaneously beneficial to realizing the characteristics of long focus and large field angle.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/FOV is less than or equal to 0.15, wherein TTL is the distance between the 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 0.13. The TTL/H/FOV is less than or equal to 0.15, the total length of the lens can be effectively limited under the condition of the same imaging surface and the same image height, and the miniaturization of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R3/R4| ≧ 2, where R3 is the central radius of curvature of the object-side face of the second lens, and R4 is the central radius of curvature of the image-side face of the second lens. More specifically, R3 and R4 may further satisfy: the absolute value of R3/R4 is more than or equal to 2.5 and less than or equal to 20. The requirement that the absolute value of R3/R4 is more than or equal to 2 is met, and the resolution is improved.

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 convex object side surface and the convex image side surface is glued with the sixth lens with the concave object side surface and the concave 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, and the optical performances of improving the resolution of the system, optimizing distortion, CRA and the like can be realized on the premise of compact structure of the optical system. 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 present application, through reasonable setting of the shapes and focal powers of the respective lenses, in the case of only using 7 lenses, at least one beneficial effect of miniaturization, high resolution (up to more than eight million pixels), small front port diameter, long back focal length, good imaging quality and the like of the optical system 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 the use of vehicles provided with the optical lens in most environments.

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 biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens L3 is a meniscus lens with negative 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens L7 has a convex-concave lens with positive power, 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.

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 and A14 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

S5

-1.6173

5.1558E-04

2.0844E-06

-7.4033E-07

4.5868E-08

-9.4703E-10

2.2857E-12

S6

-4.4253

2.8611E-04

4.4433E-06

-2.2551E-07

7.7178E-09

-6.7571E-11

-4.7385E-13

S13

5.8684

-1.2566E-03

-5.8049E-05

4.8953E-06

-5.7617E-07

3.1155E-08

-6.8385E-10

S14

58.8430

-7.1433E-04

-7.4802E-05

8.0896E-06

-7.0702E-07

3.3467E-08

-6.3818E-10

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

S5

-1.6062

5.1681E-04

2.8547E-06

-7.4430E-07

4.5314E-08

-9.2597E-10

-1.5816E-12

S6

-4.4866

2.9461E-04

4.7074E-06

-2.3063E-07

7.4603E-09

-5.6883E-11

-6.5327E-13

S13

6.3950

-1.2900E-03

-5.9594E-05

4.8093E-06

-5.7651E-07

3.1473E-08

-6.0856E-10

S14

57.6742

-7.0662E-04

-8.0521E-05

8.0190E-06

-7.0720E-07

3.3261E-08

-6.3397E-10

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 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 meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a meniscus lens with negative 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens L7 has a convex-concave lens with positive power, 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.

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

Flour mark

k

A4

A6

A8

A10

A12

A14

S5

-1.5687

5.0328E-04

3.3395E-06

-7.6707E-07

4.3762E-08

-9.1457E-10

-4.5002E-12

S6

-4.5216

2.8052E-04

3.8178E-06

-2.3783E-07

8.1860E-09

-3.6663E-11

-3.9512E-12

S13

-0.9130

-1.4199E-03

-5.3037E-05

4.9177E-06

-5.9229E-07

2.3826E-08

-5.7314E-10

S14

64.0939

-9.6497E-04

-7.3262E-05

8.1884E-06

-7.1745E-07

3.2649E-08

-6.8295E-10

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

S5

-1.5918

5.1031E-04

2.9309E-07

-7.2578E-07

4.9613E-08

-6.7294E-10

-1.5947E-11

S6

-4.3293

2.6385E-04

3.1120E-06

-1.7350E-07

8.9192E-09

-1.7852E-10

2.4317E-12

S13

-2.7770

-1.4593E-03

-5.0065E-05

5.1098E-06

-6.0042E-07

2.7493E-08

-4.9556E-10

S14

61.1254

-1.0075E-03

-7.0106E-05

8.2848E-06

-7.4003E-07

3.2211E-08

-5.0680E-10

TABLE 8

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 shows a schematic structural diagram of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens 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 biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens L3 is a meniscus lens with negative 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens L7 has a double-convex lens with positive power, and has a convex 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 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

S5

-1.6203

5.7646E-04

4.6959E-06

-7.4295E-07

4.0479E-08

-1.0251E-09

8.3603E-12

S6

-4.4079

3.8300E-04

5.9819E-06

-2.2564E-07

6.5703E-09

-7.4117E-11

-4.8953E-14

S13

52.0000

-1.2800E-03

-5.1165E-05

4.3677E-06

-5.6370E-07

3.0790E-08

-7.0639E-10

S14

45.0000

-6.1683E-04

-6.3179E-05

8.0891E-06

-7.1322E-07

3.4749E-08

-5.8558E-10

Watch 10

Example 6

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

As shown in fig. 6, the optical lens 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

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 biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens L3 is a meniscus lens with negative 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens L7 has a positive meniscus lens with 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 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

Flour mark

k

A4

A6

A8

A10

A12

A14

S5

-1.5705

4.4344E-04

2.8185E-06

-7.0021E-07

4.1291E-08

-1.0639E-09

7.0950E-12

S6

-4.0239

2.4283E-04

4.1156E-06

-2.0434E-07

7.9788E-09

-7.8748E-11

-8.3778E-16

S13

35.0000

-1.3084E-03

-4.8004E-05

5.4683E-06

-5.8966E-07

3.1506E-08

-6.0396E-10

S14

65.2225

-7.1948E-04

-5.0436E-05

8.3073E-06

-7.2250E-07

3.9997E-08

-5.4971E-10

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

S5

-1.5703

4.1160E-04

1.5744E-06

-6.6369E-07

4.2271E-08

-1.3281E-09

7.1211E-12

S6

-4.0770

2.0763E-04

4.7550E-06

-2.2882E-07

7.8462E-09

-6.5332E-11

-5.7753E-13

S13

84.5200

-1.5675E-03

-4.6771E-05

5.3277E-06

-5.2550E-07

3.0009E-08

-6.3672E-10

S14

78.5642

-7.0530E-04

-5.1900E-05

8.1024E-06

-7.9968E-07

3.8335E-08

-5.0062E-10

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 biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens L3 is a meniscus lens with negative 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. 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.

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

S5

-1.6132E+00

5.2208E-04

5.0910E-06

-7.1920E-07

4.8182E-08

-1.7499E-09

1.8329E-11

S6

-4.7838E+00

3.3311E-04

5.1275E-06

-2.7765E-07

6.2127E-09

-6.1779E-11

-1.7623E-13

S13

2.6856E+01

-1.0865E-03

-5.0999E-05

5.5375E-06

-5.3986E-07

3.0946E-08

-6.6320E-10

S14

4.6833E+01

-5.5637E-04

-6.7765E-05

8.8460E-06

-7.0424E-07

3.8316E-08

-6.8223E-10

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 meniscus lens with positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens L3 is a meniscus lens with negative 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. 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.

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

Flour mark

k

A4

A6

A8

A10

A12

A14

S5

-1.5877E+00

5.5495E-04

3.0973E-06

-7.5350E-07

4.1278E-08

-1.7502E-09

1.5552E-11

S6

-4.4993E+00

3.9518E-04

5.0138E-06

-2.2527E-07

6.0861E-09

-5.0912E-11

-1.5532E-13

S13

-9.9000E+01

-1.5101E-03

-5.0108E-05

4.1935E-06

-5.1931E-07

3.0041E-08

-6.0402E-10

S14

5.1171E+01

-9.0850E-04

-6.5332E-05

8.1357E-06

-7.1687E-07

3.4050E-08

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 biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens L3 is a meniscus lens with negative 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens L7 has a negative meniscus lens with 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 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

S5

-1.5919E+00

5.9414E-04

5.0230E-06

-7.1750E-07

4.1779E-08

-1.3821E-09

1.5422E-11

S6

-4.6473E+00

3.6004E-04

5.9157E-06

-2.7960E-07

6.1678E-09

-8.6682E-11

2.5970E-13

S13

-1.4182E+01

-1.7301E-03

-3.0100E-05

4.0163E-06

-5.7990E-07

3.5736E-08

-7.3459E-10

S14

-9.9000E+01

-4.9940E-04

-5.9643E-05

8.0666E-06

-7.8232E-07

3.1174E-08

-5.9555E-10

TABLE 22

In summary, examples 1 to 11 satisfy the relationships shown in the following tables 23-1 and 23-2, respectively. In tables 23-1 and 23-2, TTL, BFL, F, D, H, F1, F2, F5, F6, F56 are in units of millimeters (mm) and FOV is in units of degrees (°).

TABLE 23-1

TABLE 23-2

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

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

Claims

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

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

a second lens having a positive optical power;

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

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 optical power.

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

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

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

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

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

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

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

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 positive optical power;

a third lens having a negative optical power;

a fourth lens having a positive optical power;

a fifth lens having a positive optical power;

a sixth lens having a negative optical power; and

a seventh lens having optical power;

the total effective focal length F of the optical lens and the central curvature radius R1 of the object side surface of the first lens meet the following conditions: the absolute value of F/R1 is more than or equal to 0.25 and less than or equal to 0.8.

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.