CN113495343A

CN113495343A - Optical lens and electronic device

Info

Publication number: CN113495343A
Application number: CN202010254232.5A
Authority: CN
Inventors: 邱光; 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: 2020-04-02
Filing date: 2020-04-02
Publication date: 2021-10-12

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: a first lens having a negative optical power; a second lens having a positive optical power; a third lens having optical power; a fourth lens having an optical power; and a fifth lens having a positive optical power. The third lens and the fourth lens are cemented to form a cemented lens.

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

In recent years, with the rapid development of an automobile driving assistance system, an optical lens is more and more widely applied to an automobile, and a user has higher requirements on the pixel quality of a vehicle-mounted lens. Meanwhile, the performance requirements of the market on the vehicle-mounted lens are very high based on the consideration of safety, and the requirements on the performance of the vehicle-mounted lens applied to automatic driving are stricter.

The autopilot vehicle lens requires extremely high pixel quality. Generally, on the basis of the original vehicle-mounted lens, in order to improve the resolution capability of the optical lens for automatic driving, six or more lens structures are generally selected, but the miniaturization of the lens is seriously influenced. In particular, such optical lenses have high requirements on stability, and need to have small image height change in high and low temperature environments, so as to avoid lens performance degradation caused by temperature difference.

Disclosure of Invention

An aspect of the present disclosure provides an optical lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having a positive optical power; a third lens having optical power; a fourth lens having an optical power; and a fifth lens having a positive optical power. The third lens and the fourth lens are cemented to form a cemented lens.

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

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

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

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

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

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

In one embodiment, the fifth lens may have an aspherical mirror surface.

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 7.

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

In one embodiment, the maximum clear diameter 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 0.05.

In one embodiment, the radius of curvature R11 of the object-side surface of the first lens and the radius of curvature R12 of the image-side surface of the first lens may satisfy: and the | R11/R12| is more than or equal to 1.

In one embodiment, the radius of curvature R21 of the object-side surface of the second lens and the radius of curvature R22 of the image-side surface of the second lens may satisfy: the | R21/R22| ≧ 0.1.

In one embodiment, the radius of curvature R42 of the image-side surface of the fourth lens and the radius of curvature R51 of the object-side surface of the fifth lens may satisfy: the | R42/R51| ≧ 0.1.

In one embodiment, the central thickness d1 of the first lens and the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens can satisfy: d1/TTL is less than or equal to 0.15.

In one embodiment, the center thickness d5 of the fifth lens element and the distance TTL on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens system satisfy: d5/TTL is less than or equal to 0.3.

In one embodiment, the effective focal length F34 of the cemented lens formed by the third lens and the fourth lens cemented together and the total effective focal length F of the optical lens may satisfy: the absolute value of F34/F is more than or equal to 0.1 and less than or equal to 25.

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.40.

In one embodiment, the distance d45 between the fourth lens and the fifth lens on the optical axis and the total effective focal length F of the optical lens can satisfy: d45/F is less than or equal to 0.1.

In one embodiment, a distance BFL between the image-side surface of the fifth lens element and the imaging surface of the optical lens on the optical axis and a distance TTL between the object-side surface of the first lens element and the imaging surface of the optical lens on the optical axis may satisfy: BFL/TTL is more than or equal to 0.08.

Another aspect of the present application provides such an optical lens. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having a positive optical power; a third lens having optical power; a fourth lens having an optical power; and a fifth lens having a positive optical power. 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 can satisfy the following conditions: (FOV F)/H.gtoreq.40.

Another aspect of the present application provides an electronic device characterized by including the optical lens provided according to the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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

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; and

fig. 8 is a schematic view showing a structure of an optical lens according to embodiment 8 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, five lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five 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 first lens may have a convex concave type or a biconcave type. In an application scene of the vehicle-mounted lens, for example, the environment of outdoor installation and use of the vehicle-mounted lens is considered, and the vehicle-mounted lens may be in severe weather such as rain, snow and the like. Preferably, the first lens may have an aspherical surface to further improve the resolution quality.

In an exemplary embodiment, the second lens may have a positive optical power, and the second lens may have a convex concave type or a double convex type. The focal power and the surface type arrangement of the second lens can enable incident light to be smoothly transited to a rear optical system, which is beneficial to reducing the aperture of the lens, increasing the aperture of a diaphragm, increasing the light flux of the system and realizing higher picture brightness. Preferably, the second lens may be a glass lens, which is advantageous for reducing lens sensitivity.

In an exemplary embodiment, the fifth lens may have a positive optical power, and the fifth lens may have a convex concave type or a double convex type. The power and surface type setting of the fifth lens can converge the light passing through the front of the optical system. Preferably, the fifth lens can also have an aspheric lens, which is beneficial to fully correcting various aberrations of the optical system and improving the resolution of the optical system on the premise of compact structure.

In an exemplary embodiment, the fifth lens may have an aspherical mirror surface, and the fifth lens may have an aspherical mirror surface, which is advantageous to improve the resolution.

In an exemplary embodiment, the optical lens may further include a diaphragm, and the diaphragm may be disposed between the second lens and the third lens. The diaphragm is arranged between the second lens and the third lens, so that light rays entering the optical system can be restrained effectively, the aperture of a lens of the optical system is reduced, and the diaphragm can be arranged at other positions as required.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/F is less than or equal to 7, 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 5. The TTL/F is less than or equal to 7, and the miniaturization is favorably realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/H/FOV is less than or equal to 0.1, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, H is the image height corresponding to the maximum field angle FOV of the optical lens, and the FOV is the maximum field angle of the optical lens. More specifically, TTL, H, and FOV further satisfy: TTL/H/FOV is less than or equal to 0.07. The TTL/H/FOV is less than or equal to 0.1, the miniaturization is favorably realized, and the size of the optical lens can be smaller under the condition that the same imaging surface and the same image height are realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.05, wherein D is the maximum light passing diameter of the object side surface of the first lens corresponding to the maximum field angle FOV of the optical lens, H is the image height corresponding to the maximum field angle FOV of the optical lens, and FOV is the maximum field angle of the optical lens. More specifically, D, H and the FOV further satisfy: D/H/FOV is less than or equal to 0.03. The requirement that D/H/FOV is less than or equal to 0.05 is favorable for meeting the requirement of smaller front end caliber and realizing miniaturization.

In an exemplary embodiment, an optical lens according to the present application may satisfy: R11/R12| ≧ 1, where R11 is the radius of curvature of the object-side face of the first lens, and R12 is the radius of curvature of the image-side face of the first lens. More specifically, R11 and R12 may further satisfy: the | R11/R12| ≧ 1.5. The system aberration can be effectively corrected by satisfying the condition that the absolute value of R11/R12 is more than or equal to 1.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R21/R22| ≧ 0.1, where R21 is the radius of curvature of the object-side surface of the second lens, and R22 is the radius of curvature of the image-side surface of the second lens. More specifically, R21 and R22 may further satisfy: and the | R21/R22| is more than or equal to 0.3. The system aberration can be effectively corrected by satisfying the condition that the absolute value of R21/R22 is more than or equal to 0.1.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R42/R51| ≧ 0.1, where R42 is the radius of curvature of the image-side surface of the fourth lens, and R51 is the radius of curvature of the object-side surface of the fifth lens. More specifically, R42 and R51 may further satisfy: the | R42/R51| ≧ 0.5. The requirement of | R42/R51| ≧ 0.1 is met, aberration of the optical system can be corrected, and when light rays emitted from the fourth lens enter the object side of the fifth lens, the incident light rays are relatively gentle, so that tolerance sensitivity of the optical system is reduced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: d1/TTL is less than or equal to 0.15, wherein d1 is the central thickness of the first 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, d1 and TTL further satisfy: d1/TTL is less than or equal to 0.07. The d1/TTL is less than or equal to 0.15, the central thickness of the first lens can be reasonably distributed, and the improvement of the system illumination is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: d5/TTL is less than or equal to 0.3, wherein d5 is the central thickness of the fifth 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, d5 and TTL further satisfy: d5/TTL is less than or equal to 0.18. The d5/TTL is less than or equal to 0.3, the central thickness of the fifth lens can be reasonably distributed, and the improvement of the system illumination is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F34/F | ≦ 25 of 0.1 ≦ wherein F34 is an effective focal length of a cemented lens formed by cementing the third lens and the fourth lens, and F is a total effective focal length of the optical lens. More specifically, F34 and F further satisfy: the absolute value of F34/F is more than or equal to 0.5 and less than or equal to 18. Satisfying | F34/F | ≦ 25 of 0.1 ≦ can reasonably allocate the effective focal length of the cemented lens, and contribute to realizing thermal compensation.

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 40, wherein FOV is the maximum field angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle FOV of the optical lens. More specifically, FOV, F and H further satisfy: (FOV F)/H.gtoreq.50. Satisfies (FOV multiplied by F)/H more than or equal to 40, and can realize the characteristics of wide angle, high resolution, long focus and the like.

In an exemplary embodiment, an optical lens according to the present application may satisfy: d45/F is less than or equal to 0.1, wherein d45 is the spacing distance between the fourth lens and the fifth lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, d45 and F further satisfy: d45/F is less than or equal to 0.02. D45/F is less than or equal to 0.1, which is beneficial to smooth transition of light.

In an exemplary embodiment, an optical lens according to the present application may satisfy: BFL/TTL is more than or equal to 0.08, wherein BFL is the distance between the image side surface of the fifth lens element and the imaging surface of the optical lens on the optical axis, and TTL is the distance between the object side surface of the first lens element and 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 0.10. The BFL/TTL is more than or equal to 0.08, the characteristic of the focal length of the optical lens can be realized, enough space can be reserved for the optical element during installation or focusing, and mutual interference between mechanisms is avoided.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F/ENPD is less than or equal to 2.2, wherein F is the total effective focal length of the optical lens, and ENPD is the effective caliber of the optical lens. More specifically, F and ENPD may further satisfy: F/ENPD is less than or equal to 2.0. The requirement that F/ENPD is less than or equal to 2.2 is met, the optical lens has the characteristic of large aperture, and the optical lens can collect more incident light rays.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the second lens and the third lens to further improve the imaging quality of the optical lens. The diaphragm is beneficial to reducing the caliber and contracting light. In the embodiment of the present application, the stop may be disposed in the vicinity of the image side surface of the second lens or in the vicinity of the object side surface of the third 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 fifth 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 fifth 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 third lens and the fourth lens are cemented to form a cemented lens. The third lens with negative focal power, the object side surface and the image side surface both being concave surfaces and the fourth lens with positive focal power are cemented together, the object side surface and the image side surface both being convex surfaces, or the third lens with positive focal power, the object side surface and the image side surface both being convex surfaces and the fourth lens with negative focal power, the object side surface being concave surfaces and the image side surface being convex surfaces are cemented together. The cemented lens is composed of a piece of lens having positive power having a lower refractive index and a piece of lens having negative power having a higher refractive index than the lens having positive power. The lens with the lower refractive index and the lens with the higher refractive index are matched with each other, so that the rapid transition of the front light is facilitated, the aperture of the diaphragm can be increased, and the night vision requirement is met. The combination of a lens with positive focal power and a lens with negative focal power can eliminate self chromatic aberration, reduce tolerance sensitivity, and also can remain partial chromatic aberration to balance the chromatic aberration of the system. The lens with positive focal power is made of a high dispersion material, and the lens with negative focal power is made of a low dispersion material, so that the chromatic aberration of the system is corrected, and the confocal imaging effect of visible light and infrared light is realized; 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. 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, and the fifth 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 and the fifth 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 each lens shape and focal power, in the case of using only 5 lenses, at least one beneficial effect that the optical system has long focus, large aperture, high resolution, good imaging quality and the like is achieved. Specifically, the optical lens provided by the present application may have more than 800 ten thousand pixels. Meanwhile, the optical system also meets the requirements of small lens size, low sensitivity and high production yield and low cost. The optical lens also has the characteristic of smaller CRA (crazing code), stray light generated when the rear end of light rays is emitted to the lens barrel is avoided, the optical lens can be well matched with a vehicle-mounted chip, and color cast and dark corner phenomena cannot be generated. Meanwhile, the optical lens has the advantages of good temperature adaptability, small change of imaging effect in high and low temperature environments, stable image quality and contribution to accurate distance measurement of the binocular lens.

According to the optical lens of the above embodiment of the present application, through the reasonable matching of the shape, focal power, spherical surface and aspheric surface of each lens, the optical lens can realize miniaturization and convenient assembly, and simultaneously, the resolution quality and the thermal stability can also be improved. By using a plurality of aspheric lenses, aberration can be effectively corrected, the resolution quality is improved, meanwhile, the whole optical system is compact, the miniaturization is met, the tolerance sensitivity can be reduced, and the assembly is convenient.

In an exemplary embodiment, the first to fifth 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 fifth 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 fifth 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 five lenses are exemplified in the embodiment, the optical lens is not limited to include five 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 and a fifth lens element L5.

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 convex-concave lens with positive refractive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens L3 is a biconcave lens with negative power, and has a concave 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 S6 and a convex image-side surface S7. The fifth lens L5 is a convex-concave lens with positive refractive power, and has a convex object-side surface S8 and a concave image-side surface S9. The third lens L3 and the fourth lens L4 may be cemented to constitute a cemented lens.

The object-side surface S8 and the image-side surface S9 of the fifth lens L5 are aspheric mirror surfaces.

The optical lens may further include a stop STO, which may be disposed between the second lens L2 and the third lens L3 to improve image quality. For example, the stop STO may be disposed near the object side S5 of the third lens L3.

Optionally, the optical lens may further include a filter L6 and/or a protective glass L6 'having an object side S10 and an image side S11, the filter L6 may be used to correct color deviation and the protective glass L6' may be used to protect the image sensing chip IMA located at the imaging plane S12. The light from the object sequentially passes through the respective surfaces S1 to S11 and is finally imaged on the imaging surface S12.

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

TABLE 1

In embodiment 1, both the object-side surface S8 and the image-side surface S9 of the fifth lens L5 may 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 and A12 which can be used for each of the aspherical mirror surfaces S8 and S9 in example 1.

Flour mark

k

A4

A6

A8

A10

A12

S8

9.8710E-02

-5.2548E-04

-7.2645E-05

8.5849E-06

-8.0147E-09

-2.8778E-08

S9

1.75E+00

2.53E-03

-3.91E-04

4.79E-05

7.97E-06

-3.22E-07

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 and a fifth lens element L5.

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

S8

1.1896E-01

-4.8927E-04

-3.4137E-05

8.7123E-06

-2.6146E-07

-6.3806E-08

S9

1.69E+00

2.56E-03

-4.55E-04

2.48E-05

7.40E-06

-1.72E-07

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 and a fifth lens element L5.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a 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 biconcave lens with negative power, and has a concave 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 S6 and a convex image-side surface S7. The fifth lens L5 is a convex-concave lens with positive refractive power, and has a convex object-side surface S8 and a concave image-side surface S9. The third lens L3 and the fourth lens L4 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

S8

-6.6107E-01

4.8368E-04

2.4230E-06

-1.3749E-05

1.1633E-06

-1.3099E-07

S9

8.18E+00

2.67E-03

2.52E-05

-2.07E-05

3.29E-06

-3.47E-07

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 and a fifth lens element L5.

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

S8

-8.8771E-01

2.0158E-04

1.4075E-05

-1.1268E-05

1.9817E-06

-1.1419E-07

S9

6.13E-01

1.20E-03

1.65E-05

-1.43E-05

3.72E-06

-3.26E-07

TABLE 8

Example 5

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

As shown in fig. 5, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4 and a fifth lens element L5.

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 convex-concave lens with positive refractive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens L4 is a meniscus lens with negative power, and has a concave object-side surface S6 and a convex image-side surface S7. The fifth lens L5 is a convex-concave lens with positive refractive power, and has a convex object-side surface S8 and a concave image-side surface S9. The third lens L3 and the fourth lens L4 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

S8

-3.4592E-01

2.8129E-04

7.0866E-05

-2.1889E-05

1.9455E-06

-2.0855E-07

S9

-4.17E-01

5.00E-03

2.29E-05

5.34E-05

1.24E-06

2.51E-07

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 and a fifth lens element L5.

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

TABLE 11

Flour mark

k

A4

A6

A8

A10

A12

S8

-5.4923E-01

9.2871E-04

-3.3942E-04

-1.5830E-04

2.5737E-05

-3.6016E-06

S9

-3.15E-02

8.12E-03

-1.22E-03

3.67E-04

-1.22E-04

1.04E-05

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 and a fifth lens element L5.

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 convex-concave lens with positive refractive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens L3 is a biconcave lens with negative power, and has a concave 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 S6 and a convex image-side surface S7. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The third lens L3 and the fourth lens L4 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

S8

-1.3450E-02

1.4247E-05

-6.6314E-06

1.5216E-06

6.5257E-08

2.4519E-08

S9

-4.50E+02

-2.62E-05

3.51E-05

4.51E-06

-6.75E-08

3.64E-08

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 and a fifth lens element L5.

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

S8

-1.5507E-01

-9.7453E-05

1.3750E-06

2.3593E-06

1.1333E-08

2.2942E-09

S9

-2.11E+02

-1.73E-04

3.23E-05

5.53E-06

-7.61E-08

-5.60E-09

TABLE 16

In summary, examples 1 to 8 satisfy the relationships shown in the following tables 17-1 and 17-2, respectively. In table 17, TTL, F, H, D, BFL, ENPD, and F34 are in units of millimeters (mm) and FOV is in units of degrees (°).

Conditional expression (A) example	Example 1	Example 2	Example 3	Example 4
					TTL	18.1063	18.4563	17.5385	17.8866
F	5.71097	5.7211	6.07193	6.0371
					H	6.184	6.184	6.184	6.184
FOV	60.0000	60.0000	60.0000	60.0000
					D	7.030368	7.030368	7.030368	7.030368
BFL	1.9500	1.9500	3.1583	3.1583
					ENPD	3.26341	3.2692	3.28213	3.2633
F34	15.380256	15.2127	-55.8107	-92.8394
					TTL/F	3.1704	3.2260	2.8885	2.9628
TTL/H/FOV	0.0488	0.0497	0.0473	0.0482
					D/H/FOV	0.0189	0.0189	0.0189	0.0189
\|R11/R12\|	2.9218	2.9091	1.7822	1.8050
					\|R21/R22\|	0.5097	0.5133	0.7434	0.7540
\|R42/R51\|	1.0472	1.0467	1.1638	1.1741
					d1/TTL	0.0525	0.0596	0.0456	0.0559
d5/TTL	0.1602	0.1571	0.1360	0.1613
					\|F34/F\|	2.6931	2.6591	9.1916	15.3780
(FOV×F)/H	55.4104	55.5085	58.9126	58.5751
					d45/F	0.0175	0.0175	0.0165	0.0166
BFL/TTL	0.1077	0.1057	0.1801	0.1766
					F/ENPD	1.7500	1.7500	1.8500	1.8500

TABLE 17-1

TABLE 17-2

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:

a first lens having a negative optical power;

a second lens having a positive optical power;

a third lens having optical power;

a fourth lens having an optical power; and

a fifth lens having a positive optical power;

the third lens and the fourth lens are cemented to form a cemented lens.

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

3. An optical lens barrel according to claim 1, wherein the object side surface of the first lens element is concave and the image side surface is concave; and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface.

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

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

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

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

8. An optical lens according to claim 1, characterized in that the fifth lens has an aspherical mirror 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 positive optical power;

a third lens having optical power;

a fourth lens having an optical power; and

a fifth lens having a positive optical power;

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 satisfy the following conditions: (FOV F)/H.gtoreq.40.

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.