CN113031207A

CN113031207A - Optical lens and electronic device

Info

Publication number: CN113031207A
Application number: CN201911355162.6A
Authority: CN
Inventors: 张野; 徐超; 杨佳
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2021-06-25

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

Description

Optical lens and electronic device

Technical Field

The present disclosure relates to the field of optical elements, and more particularly, to an optical lens and an electronic device.

Background

With the development of scientific technology and the wide application of high and new technologies, the automobile driving assistance technology is gradually developed and tends to mature. The application of optical lenses in automobiles is also becoming more and more widespread. The optical lens is an indispensable component in a machine vision system, and the quality of the optical lens directly affects the quality of imaging. In recent years, with the popularization of a car equipped with a reverse image device, the market has been increasingly demanding on the performance of an optical lens used in a car driving assistance system.

Disclosure of Invention

The present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens, characterized in that: the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has focal power; the fifth lens has focal power; the sixth lens has positive focal power; and the seventh lens has a positive optical power.

In one embodiment, the fourth lens element has positive optical power, and has a convex object-side surface and a convex image-side surface. In addition, the fifth lens has negative focal power, and the object side surface of the fifth lens is a concave surface and the image side surface of the fifth lens is a convex surface.

In one embodiment, the fourth lens has a negative power and has a concave object-side surface and a concave image-side surface. In addition, the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface.

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

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

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

In one embodiment, the sixth lens element has a convex object-side surface and a concave 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 convex object-side surface and a flat 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 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 XF)/H.gtoreq.65.

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 12.

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 0.25.

In one embodiment, a distance BFL on the optical axis from the image-side surface of the seventh lens element to the image plane of the optical lens and a distance TL on the optical axis from the object-side surface of the first lens element to the image-side surface of the seventh lens element may satisfy: BFL/TL is more than or equal to 0.04.

In one embodiment, an entrance pupil diameter ENPD of the optical lens and a distance TTL on an optical axis from an object side surface of the first lens to an imaging surface of the optical lens may satisfy: ENPD/TTL is more than or equal to 0.02.

In one embodiment, the effective focal length F6 of the sixth lens and the effective focal length F7 of the seventh lens may satisfy: the absolute value of F6/F7 is more than or equal to 0.1 and less than or equal to 5.

In one embodiment, the central radius of curvature R3 of the object-side surface of the second lens, the central radius of curvature R4 of the image-side surface of the second lens, and the central thickness d2 of the second lens may satisfy: R3/(R4+ d2) is more than or equal to 0 and less than or equal to 4.

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 | F/R1| is less than or equal to 3.

In one embodiment, the central radius of curvature R2 of the image side surface of the first lens and the effective focal length F1 of the first lens may satisfy: R2/F1 is less than or equal to-0.6.

This application has adopted seven lens, through optimizing shape, the focal power etc. that sets up each lens, makes optical lens have high resolution, miniaturized, big light ring, be convenient for equipment, at least one beneficial effect such as temperature performance is 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, and the object side surface may be convex and the image side surface may be concave. The focal power of the first lens is set, so that the imaging quality can be improved, the excessive divergence of object light rays can be avoided, and the aperture of the rear lens can be controlled. The surface type arrangement of the first lens is beneficial to collecting light rays with a large view field to enter a rear optical system and increasing the light flux, so that the whole large view field range is favorably realized; meanwhile, the convex side surface of the object is beneficial to the adaptation of the lens to outdoor use environments (such as water drops in severe weather like rain and snow and the like) and the influence on imaging is reduced.

In an exemplary embodiment, the second lens may have a negative power, and the object side surface may be concave and the image side surface may be convex. The arrangement of the focal power and the surface type of the second lens can further diverge the light rays to adjust the light rays and reduce chromatic aberration.

In an exemplary embodiment, the third lens may have a positive optical power, and the object-side surface thereof may be convex and the image-side surface thereof may be convex. The arrangement of the focal power and the surface type of the third lens can converge the light to adjust the light, so that the trend of the light can be smoothly transited to the rear. By controlling the focal length of the third lens, the light trend from the first lens to the third lens is controlled, and the structure of the lens is compact.

In an exemplary embodiment, the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power.

In an exemplary embodiment, the sixth lens may have a positive optical power. The sixth lens may have a convex type, a convex planar type, or a convex concave type. The arrangement of the focal power and the surface type of the sixth lens is beneficial to converging light to adjust the light, so that the light trend can be more smoothly transited to the rear.

In an exemplary embodiment, the seventh lens may have a positive optical power. The seventh lens may have a convex type, a convex planar type, or a convex concave type. The arrangement of the focal power and the surface type of the seventh lens can further converge the light collected by the sixth lens, so that the system CRA and the like can be effectively reduced, the optical lens is more suitable for being used in a weak light environment, and the focal lengths of the two adjacent lenses are close, thereby being beneficial to improving the resolution quality.

In an exemplary embodiment, the fourth lens element may have a positive optical power, and the object-side surface thereof may be convex and the image-side surface thereof may be convex. In addition, the fifth lens element can have a negative power, and the object-side surface can be concave and the image-side surface can be convex.

In an exemplary embodiment, the fourth lens may have a negative optical power, and the object side surface thereof may be concave and the image side surface thereof may be concave. In addition, the fifth lens element can have positive optical power, and the object-side surface and the image-side surface can be convex surfaces.

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 65, wherein FOV is the maximum angle of view 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 angle of view FOV of the optical lens. More specifically, FOV, F and H further satisfy: (FOV F)/H.gtoreq.70. Satisfies (FOV multiplied by F)/H is more than or equal to 65, and is beneficial to realizing wide angle.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 12, 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 11.5. The TTL/F is less than or equal to 12, and the miniaturization of the optical lens 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 0.25, 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 0.20. The TTL/H/FOV is less than or equal to 0.25, and the miniaturization of the optical lens is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: BFL/TL is more than or equal to 0.04, wherein BFL is the distance on the optical axis from the image side surface of the seventh lens to the imaging surface of the optical lens, and TL is the distance on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens. More specifically, BFL and TL may further satisfy: BFL/TL is more than or equal to 0.05. The requirement that BFL/TL is more than or equal to 0.04 is met, the requirement that the back focal length of the optical lens is longer can be met on the premise that the miniaturization of the optical lens is realized, and the assembly of an optical lens module is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: ENPD/TTL is more than or equal to 0.02, wherein ENPD is the entrance pupil diameter of the optical lens, and 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. More specifically, ENPD and TTL further can satisfy: ENPD/TTL is more than or equal to 0.03. The ENPD/TTL is more than or equal to 0.02, and clear images can be realized in a low-light environment or at night.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.1 ≦ F6/F7 ≦ 5, where F6 is the effective power of the sixth lens and F7 is the effective focal length of the seventh lens. More specifically, F6 and F7 may further satisfy: the absolute value of F6/F7 is more than or equal to 0.2 and less than or equal to 4. The requirement that the absolute value of F6/F7 is less than or equal to 5 is more than or equal to 0.1, the light is in smooth transition, and the resolution quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0 ≦ R3/(R4+ d2) ≦ 4, where R3 is the center radius of curvature of the object-side surface of the second lens, R4 is the center radius of curvature of the image-side surface of the second lens, and d2 is the center thickness of the second lens. More specifically, R3, R4, and d2 may further satisfy: R3/(R4+ d2) is more than or equal to 0.2 and less than or equal to 3. Satisfy 0 ≤ R3/(R4+ d2) and be ≤ 4, can make optical lens's peripheral light and central light have the optical path difference, can diverge central light, get into rear optical system, be favorable to reducing the lens front end bore, reduce optical lens's volume, be favorable to realizing optical lens's miniaturization, reduce cost.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F/R1| ≦ 3, wherein F is the total effective focal length of the optical lens, and R1 is the center radius of curvature of the object-side surface of the first lens. More specifically, F and R1 further satisfy: the | F/R1| is less than or equal to 1. Satisfy | F/R1| ≦ 3, can avoid the too big problem of first lens object side center radius of curvature to produce the aberration when effectively avoiding light to incide, be favorable to the preparation of first lens.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R2/F1 is less than or equal to-0.6, wherein R2 is the central curvature radius of the image side surface of the first lens, and F1 is the effective focal length of the first lens. More specifically, R2 and F1 may further satisfy: R2/F1 is less than or equal to-0.61. The requirement of R2/F1 is less than or equal to-0.6, so that the tolerance sensitivity of the first lens is reduced, and the assembly of the lens is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: i F1/F | ≧ 1, where 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: 90 ≧ F1/F ≧ 1.5. The requirement that the absolute value of F1/F is more than or equal to 1 is met, the front-end caliber is favorably reduced, and the imaging quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F2/F | ≧ 1, wherein F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical lens. More specifically, F2 and F further satisfy: and | F2/F | ≧ 2. The requirement that the absolute value of F2/F is more than or equal to 1 is met, and the imaging quality is favorably improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F | ≧ 1.5, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical lens. More specifically, F3 and F further satisfy: 90 ≧ F3/F ≧ 2. The light ray trend from the first lens to the third lens can be controlled, the structure of the lens is compact, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F4/F | ≧ 0.5, wherein F4 is the effective focal length of the fourth lens, and F is the total effective focal length of the optical lens. More specifically, F4 and F further satisfy: 90 ≧ F4/F ≧ 1. The requirement that the absolute value of F4/F is more than or equal to 0.5 is met, the front-end caliber is favorably reduced, and the imaging quality is improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F5/F | ≧ 0.5, wherein F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens. More specifically, F5 and F further satisfy: 90 ≧ F5/F ≧ 1. The requirement that the absolute value of F5/F is more than or equal to 0.5 is met, and the imaging quality is favorably improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F6/F | ≧ 0.5, wherein F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens. More specifically, F6 and F further satisfy: 90 ≧ F6/F ≧ 1. The requirement that the absolute value of F6/F is more than or equal to 0.5 is met, and the imaging quality is favorably improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F7/F | ≧ 3, wherein F7 is the effective focal length of the seventh lens, and F is the total effective focal length of the optical lens. More specifically, F7 and F further satisfy: 90 ≧ F7/F ≧ 4. The requirement that the absolute value of F7/F is more than or equal to 3 is met, and the imaging quality is favorably improved.

In an exemplary embodiment, an optical lens according to the present application may satisfy: tan (FOV) is ≧ 2, where FOV is the maximum field angle of the optical lens. More specifically, the FOV may further satisfy: tan (FOV) is not less than 3. And tan (FOV) is more than or equal to 2, and the lens can have the largest possible field angle on the premise of ensuring the imaging quality 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 favorable for increasing the aperture of the diaphragm and meets the night vision requirement. 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 fourth lens and the fifth lens are cemented to form a cemented lens. The fourth lens that the object side face and the image side face are convex surfaces and the fifth lens that the object side face is concave surfaces are glued, or the fourth lens that the object side face and the image side face are concave surfaces and the fifth lens that the object side face is convex surfaces are glued, so that light rays emitted by the third 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 favorably corrected, and the optical performance such as system resolution is improved, distortion and CRA is 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 air space 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.

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 has 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 lens 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.

The optical lens according to the above-described embodiment of the present application achieves at least one advantageous effect that the optical system has a large wide angle, a short total length, good imaging quality, and the like, in the case of using only 7 lenses, by appropriate setting of each lens shape and optical power. Meanwhile, the optical system also meets the requirements of small lens size and high production yield and low cost. The optical lens also has the characteristic of a large aperture, and can ensure clear imaging even in a low-light environment or at night. 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 above embodiment of the application, the cemented lens is arranged, the whole chromatic aberration correction of the system is shared, the system aberration correction is facilitated, the system resolution quality is improved, 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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being concave. 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 with positive power, with the object side S13 being convex and the image side S14 being concave. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the image side surface S6 of the third lens L3.

In the present embodiment, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 may each be aspheric.

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 air interval d12 between the first lens L1 and the second lens L2, and so on), a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1.

TABLE 1

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.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens L5 is a meniscus lens with negative power, with the object side S9 being concave and the image side S10 being concave. The sixth lens L6 is a convex-flat lens with positive power, and has a convex object-side surface S11 and a flat image-side surface S12. The seventh lens L7 is a meniscus lens with positive power, with the object side S13 being convex and the image side S14 being concave. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

In the present embodiment, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the seventh lens L7 may each be aspheric.

Table 2 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 2

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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. The third lens L3 is a biconvex lens with positive optical 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. The seventh lens L7 is a meniscus lens with positive power, with the object side S13 being convex and the image side S14 being concave. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 3 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3.

TABLE 3

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.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. 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 convex-flat lens with positive power, and has a convex object-side surface S13 and a flat image-side surface S14. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

In the present embodiment, the object-side surface and the image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may each be aspheric.

Table 4 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 4

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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. 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 element L7 is a biconvex lens with positive refractive power, and has a convex object-side surface S13 and a convex image-side surface S14. The fourth lens L4 and the fifth lens L5 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 5.

TABLE 5

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.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. The sixth lens L6 is a convex-flat lens with positive power, and has a convex object-side surface S11 and a flat image-side surface S12. The seventh lens L7 is a convex-flat lens with positive power, and has a convex object-side surface S13 and a flat image-side surface S14. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

In the present embodiment, the object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may each be aspheric.

Table 6 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 6

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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. The sixth lens L6 is a convex-flat lens with positive power, and has a convex object-side surface S11 and a flat image-side surface S12. The seventh lens element L7 is a biconvex lens with positive refractive power, and has a convex object-side surface S13 and a convex image-side surface S14. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 7 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 7.

TABLE 7

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.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. The seventh lens L7 is a convex-flat lens with positive power, and has a convex object-side surface S13 and a flat image-side surface S14. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 8 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 8

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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. The seventh lens element L7 is a biconvex lens with positive refractive power, and has a convex object-side surface S13 and a convex image-side surface S14. The fourth lens L4 and the fifth lens L5 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 9.

TABLE 9

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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 L4 is a biconcave lens with negative power, and has a concave object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. 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 with positive power, with the object side S13 being convex and the image side S14 being concave. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 10 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.

Watch 10

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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 L4 is a biconcave lens with negative power, and has a concave object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a convex-flat lens with positive power, and has a convex object-side surface S11 and a flat image-side surface S12. The seventh lens L7 is a meniscus lens with positive power, with the object side S13 being convex and the image side S14 being concave. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 11 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 11.

TABLE 11

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.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. 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 L4 is a biconcave lens with negative power, and has a concave object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. The seventh lens L7 is a meniscus lens with positive power, with the object side S13 being convex and the image side S14 being concave. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

Table 12 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 12

In summary, examples 1 to 12 satisfy the relationships shown in the following tables 13-1 and 13-2, respectively. In table 13, units of F, H, TTL, BFL, TL, ENPD, F1, F2, F3, F4, F5, F6, F7, R1, R2, R3, R4, d2 are millimeters (mm), and units of FOV are degrees (°)

TABLE 13-1

TABLE 13-2

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;

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

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

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having positive optical power; and

a seventh lens having a positive optical power.

2. An optical lens barrel according to claim 1, wherein the fourth lens element has a positive optical power, and has a convex object-side surface and a convex image-side surface; the fifth lens has negative focal power, and the object side surface of the fifth lens is a concave surface while the image side surface of the fifth lens is a convex surface.

3. An optical lens barrel according to claim 1, wherein the fourth lens element has a negative power, and has a concave object-side surface and a concave image-side surface; the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface.

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

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

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

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

8. 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.

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 an optical power;

a fifth lens having optical power;

a sixth lens having positive optical power;

a seventh lens having positive optical power; and

the entrance pupil diameter ENPD of the optical lens and the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy that: ENPD/TTL is more than or equal to 0.02.

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.