CN113267870A

CN113267870A - Optical lens and electronic device

Info

Publication number: CN113267870A
Application number: CN202010092114.9A
Authority: CN
Inventors: 王东方; 赵哲; 宋越; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2021-08-17

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 an optical power; a second lens element having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a third lens 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 a positive optical power; and a fifth lens having a negative optical power.

Description

Optical lens and electronic device

Technical Field

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

Background

With the rapid development of automobile driving assistance systems in recent years, lenses are more and more widely applied to automobiles, and people have higher and higher requirements on vehicle-mounted lens pixels. The lens of the autonomous vehicle has a very high demand for the pixel. Therefore, on the basis of the original vehicle-mounted optical lens, in order to improve the resolution capability of the optical lens applied to the automatic driving automobile, people usually select a lens structure of 6 or more sheets, but the miniaturization of the lens is seriously influenced.

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

Disclosure of Invention

An aspect of the present 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 an optical power; a second lens element having a negative refractive power, the object-side surface of which is concave and the image-side surface of which is concave; a third lens 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 a positive optical power; and a fifth lens having a negative optical power.

In one embodiment, the first lens has a negative power and has a concave object-side surface and a concave image-side surface.

In one embodiment, the first lens element has a positive optical power, a concave object-side surface, and a convex image-side surface.

In one embodiment, the first lens element has a positive optical power, a convex object-side surface and a concave image-side surface.

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

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

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

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

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

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

In one embodiment, the first lens has an aspherical mirror surface.

In one embodiment, the fourth lens has 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: F/TTL is more than or equal to 0.5.

In one embodiment, a distance TTL from an object side surface of the first lens to an imaging surface of the optical lens on the optical axis, an image height H corresponding to a maximum field angle FOV of the optical lens, and the maximum field angle FOV of the optical lens may satisfy: TTL/H/FOV is less than or equal to 0.15.

In one embodiment, the maximum clear half-aperture D of the object-side surface of the first lens corresponding to the maximum field angle 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 0.5.

In one embodiment, the effective focal length F2 of the second lens and the effective focal length F3 of the third lens may satisfy: the ratio of F2 to F3 is less than or equal to 5.

In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F5 of the fifth lens may satisfy: the ratio of F4 to F5 is less than or equal to 5.

In one embodiment, a ratio of a maximum value dn to a minimum value dm of center thicknesses of any two lenses of the first lens to the fifth lens may satisfy: 0.2-8 of dn/dm.

In one embodiment, the central radius of curvature R4 of the object-side surface of the second lens and the central radius of curvature R5 of the image-side surface of the second lens may satisfy: the ratio of R4 to R5 is less than or equal to 5. In one embodiment, the central radius of curvature R5 of the image-side surface of the second lens and the central radius of curvature R6 of the image-side surface of the third lens may satisfy: the ratio of R5 to R6 is less than or equal to 5.

In one embodiment, the effective focal length F23 of the cemented lens formed by the second lens and the third lens cemented together and the total effective focal length F of the optical lens may satisfy: 0.2 ≦ F23/F ≦ 6.

In one embodiment, the effective focal length F45 of the cemented lens formed by the fourth lens and the fifth lens cemented together and the total effective focal length F of the optical lens may satisfy: 0.2 ≦ F45/F ≦ 6.

In one embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle FOV of the optical lens may satisfy: (FOV F)/H.gtoreq.50.

In one embodiment, the central radius of curvature R5 of the image-side surface of the second lens and the central radius of curvature R6 of the image-side surface of the third lens may satisfy: and l (R5-R6)/(R5+ R6) l is less than or equal to 15.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical lens on the optical axis and a distance BFL between an image side surface of the fifth lens element and the imaging surface of the optical lens on the optical axis satisfy: TTL/BFL is more than or equal to 3.65.

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 an optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens having a positive optical power; and a fifth lens having a negative optical power. The distance TTL from the object side surface of the first lens element to the imaging surface of the optical lens on the optical axis and the distance BFL from the image side surface of the fifth lens element to the imaging surface of the optical lens on the optical axis can satisfy the following conditions: TTL/BFL is more than or equal to 3.65.

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, the focal power etc. that sets up each lens, makes optical lens have at least one beneficial effect such as high resolution, low cost, temperature performance are good.

Drawings

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

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

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

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

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

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

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

fig. 7 is a schematic structural view showing an optical lens according to embodiment 7 of the present application; 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 positive power or a negative power. The first lens may have a concave-concave type, a convex-concave type, or a convex-concave type. The arrangement of the focal power and the surface type of the first lens is beneficial to collecting light rays with a large visual field as much as possible to enter a rear optical system and increasing the light flux. In practical application, considering that the outdoor installation and use environment of the vehicle-mounted lens is in severe weather such as rain and snow, the shape is beneficial to the sliding of water drops so as to reduce the influence on imaging. The first lens is preferably an aspherical lens to further improve the resolution quality.

In an exemplary embodiment, the second 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 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.

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

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

In an exemplary embodiment, the first lens may have an aspherical mirror surface. The planar arrangement of the first lens is beneficial to improving the resolution quality.

In an exemplary embodiment, the fourth lens may have an aspherical mirror surface. The surface type arrangement of the fourth lens is beneficial to improving the resolution quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: F/TTL is more than or equal to 0.5, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F further satisfy: F/TTL is more than or equal to 0.7. The F/TTL is more than or equal to 0.5, and the long focus characteristic 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 0.15, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, H is the image height corresponding to the maximum field angle FOV of the optical lens, and the FOV is the maximum field angle of the optical lens. More specifically, TTL, H, and FOV further satisfy: TTL/H/FOV is less than or equal to 0.1. The TTL/H/FOV is less than or equal to 0.15, the miniaturization is favorably realized, and the smaller size is ensured under the condition of the same imaging surface and the same image height.

In an exemplary embodiment, an optical lens according to the present application may satisfy: D/H/FOV is less than or equal to 0.5, wherein D is the maximum light-passing half caliber of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, 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, D, H and the FOV further satisfy: D/H/FOV is less than or equal to 0.1. The D/H/FOV is less than or equal to 0.5, which is beneficial to realizing the small diameter of the front port of the optical lens and the miniaturization.

In an exemplary embodiment, an optical lens according to the present application may satisfy: i F2/F3I is less than or equal to 5, wherein F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens. More specifically, F2 and F3 may further satisfy: the ratio of F2 to F3 is less than or equal to 3. Satisfying | F2/F3| ≦ 5 is favorable for making the focal length of the cemented piece lenses in the second lens and the third lens cemented piece group similar, and is favorable for smoothing and excessive light and correcting chromatic aberration.

In an exemplary embodiment, an optical lens according to the present application may satisfy: i F4/F5I is less than or equal to 5, wherein F4 is the effective focal length of the fourth lens, and F5 is the effective focal length of the fifth lens. More specifically, F4 and F5 may further satisfy: the ratio of F4 to F5 is less than or equal to 3. Satisfying | F4/F5| ≦ 5 is favorable for making the focal length of the cemented piece lenses in the fourth lens cemented piece group and the fifth lens cemented piece group similar, and is favorable for smoothing and excessive light and correcting chromatic aberration.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.2 < dn/dm < 8, where dn is the maximum value of the center thicknesses of any two lenses of the first lens to the fifth lens, and dm is the minimum value of the center thicknesses of any two lenses of the first lens to the fifth lens. More specifically, dn and dm further satisfy: 0.5-6 of dn/dm. The requirement that dn/dm is more than or equal to 0.2 and less than or equal to 8 is met, the thickness uniformity of the lenses is favorably realized, the effect of each lens is stable, the small light change at high and low temperatures is favorably realized, and the temperature performance is good.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R4/R5| ≦ 5, wherein R4 is the central radius of curvature of the object-side surface of the second lens, and R5 is the central radius of curvature of the image-side surface of the second lens. More specifically, R4 and R5 may further satisfy: the ratio of R4 to R5 is less than or equal to 4. The requirement that the absolute value of R4/R5 is less than or equal to 5 is met, the central curvature radius values of the object side surface and the image side surface of the second lens are similar, and light rays enter smoothly to improve the resolution quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | R5/R6| ≦ 5, wherein R5 is the central radius of curvature of the image-side surface of the second lens, and R6 is the central radius of curvature of the image-side surface of the third lens. More specifically, R5 and R6 may further satisfy: the ratio of R5 to R6 is less than or equal to 4. Satisfy | R5/R6| ≦ 5, be favorable to realizing that the central curvature radius value of second lens image side is close with the central curvature radius value of third lens image side, make light get into smoothly to improve the resolution quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.2 ≦ F23/F ≦ 6, wherein F23 is the effective focal length of the cemented lens formed by the second lens and the third lens cemented together, and F is the total effective focal length of the optical lens. More specifically, F23 and F further satisfy: F23/F is not less than 1 and not more than 5. Satisfying 0.2 ≦ F23/F ≦ 6, the effective focal length of the cemented lens formed by the second lens and the third lens can be reasonably distributed, and the realization of thermal compensation is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 0.2 ≦ F45/F ≦ 6, wherein F45 is the effective focal length of the cemented lens formed by the fourth lens and the fifth lens cemented together, and F is the total effective focal length of the optical lens. More specifically, F45 and F further satisfy: F45/F is not less than 1 and not more than 5. Satisfying 0.2 ≦ F45/F ≦ 6, the effective focal length of the cemented lens formed by the fourth lens and the fifth lens can be reasonably distributed, and the realization of thermal compensation is facilitated.

In an exemplary embodiment, an optical lens according to the present application may satisfy: (FOV multiplied by F)/H is more than or equal to 50, wherein FOV is the maximum field angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle FOV of the optical lens. More specifically, FOV, F and H further satisfy: (FOV F)/H.gtoreq.45. Satisfies (FOV multiplied by F)/H more than or equal to 50, and is beneficial to realizing the characteristics of wide angle resolution, long focus and the like.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and l (R5-R6)/(R5+ R6) | is less than or equal to 15, wherein R5 is the central curvature radius of the image side surface of the second lens, and R6 is the central curvature radius of the image side surface of the third lens. Satisfying | (R5-R6)/(R5+ R6) | ≦ 15, it is possible to correct aberration of the optical system and to ensure that the incident angle is not too large when the light exiting from the second lens is incident on the object side of the third lens, thereby reducing tolerance sensitivity of the optical system. If the value exceeds the upper limit, the aberration of the optical system cannot be sufficiently corrected.

In an exemplary embodiment, an optical lens according to the present application may satisfy: TTL/BFL is more than or equal to 3.65, 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 TTL is the distance between the image side surface of the BFL fifth lens and the imaging surface of the optical lens on the optical axis. More specifically, TTL and BFL may further satisfy: TTL/BFL is more than or equal to 3.7 and less than or equal to 10. The TTL/BFL is more than or equal to 3.65, and the miniaturization is realized.

In an exemplary embodiment, an optical lens according to the present application may satisfy: 1.58 Nd1 Nd 1.82, wherein Nd1 is the refractive index of the first lens. More specifically, Nd1 further satisfies: nd1 is more than or equal to 1.6 and less than or equal to 1.8. Satisfying 1.58 < Nd1 < 1.82, the first lens can be made of high refractive index material, which is beneficial to reducing the front end aperture and improving the imaging quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F1/F | ≧ 0.5, wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens. More specifically, F1 and F further satisfy: i F1/F | ≧ 1. Satisfying | F1/F | ≧ 0.5, the first lens can be made of high refractive index material, which is beneficial to reducing the front end aperture and improving the imaging quality.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F2/F | ≧ 0.5, 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: i F2/F | ≧ 1. The requirement that | F2/F | is more than or equal to 0.5 is met, the focal distance of the lens can be reasonably distributed, more light rays can enter stably, and the illumination intensity is increased.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F3/F | ≧ 0.05, 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: and the | F3/F | is more than or equal to 0.1. The requirement that the absolute value of F3/F is more than or equal to 0.05 can be met, the focal length of the lens can be reasonably distributed, and various aberrations can be balanced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F4/F | ≧ 0.05, 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: and the | F4/F | is more than or equal to 0.1. The requirement that the absolute value of F4/F is more than or equal to 0.05 can be met, the focal length of the lens can be reasonably distributed, and various aberrations can be balanced.

In an exemplary embodiment, an optical lens according to the present application may satisfy: and | F5/F | ≧ 0.05, 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: and the | F5/F | is more than or equal to 0.1. The requirement that the absolute value of F5/F is more than or equal to 0.05 can be met, the focal length of the lens can be reasonably distributed, and various aberrations can be balanced.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the first lens and the second 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 first lens or in the vicinity of the object side surface of the second 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 second lens and the third lens are cemented to form a cemented lens. The second lens with the concave object side surface and the concave image side surface and the third lens with the convex object side surface and the convex image side surface are glued, so that light rays emitted by the first lens are smoothly transited to an imaging surface, the total length of an optical system is reduced, various aberrations of the optical system are corrected, and the optical performances of improving the resolution of the system, optimizing distortion, CRA and the like are realized 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. The above cemented lens is preferably an aspherical lens to further improve the resolution quality.

In an exemplary embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens. The object side surface is a convex surface, the fourth lens with the concave surface on the image side surface is glued with the fifth lens with the concave surface on the object side surface and the image side surface, or the fourth lens with the convex surface on the object side surface and the convex surface on the image side surface is glued with the fifth lens with the concave surface on the object side surface and the image side surface, so that the emergent light of the third lens is smoothly transited to an imaging surface, the total length of an optical system is reduced, various aberrations of the optical system are corrected, and the optical performance such as the system resolution is improved, the distortion and the CRA are optimized on the premise that the optical system is compact in structure. The gluing mode adopted between the lenses has at least one of the following advantages: self color difference is reduced, tolerance sensitivity is reduced, and the integral color difference of the system is balanced through the residual partial color difference; reducing the 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 lens 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, high resolution, good imaging quality and the like is achieved. Meanwhile, the optical system also meets the requirements of small lens size, low sensitivity and high production yield and low cost. The optical lens also has the characteristic of smaller CRA (crazing code), stray light generated when the rear end of light rays is emitted to the lens barrel is avoided, the optical lens can be well matched with a vehicle-mounted chip, and color cast and dark corner phenomena cannot be generated. Meanwhile, the optical lens has the advantages of good temperature adaptability, small change of imaging effect in high and low temperature environments, stable image quality and contribution to accurate distance measurement of the binocular lens.

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

In an exemplary embodiment, the first to 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 biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S4 and a concave image-side surface S5. 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 S7 and a convex image-side surface S8. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S8 and a concave image-side surface S9. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens. 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 first lens L1 and the second lens L2 to improve image quality. For example, the stop STO may be disposed near the object side S4 of the second lens L2.

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 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

In embodiment 1, the object-side surface S1 and the image-side surface S2 of the first lens L1 and the object-side surface S7 of the fourth lens L4 may each be aspheric, and the surface type x of each aspheric lens may be defined by, but is 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 cone coefficients k and the high-order term coefficients A4, A6, A8, A10, A12 and A14 which can be used for each of the aspherical mirror surfaces S1, S2 and S7 in example 1.

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

A14

S1

50.2535

-6.5118E-04

4.1864E-06

-3.2874E-08

6.5219E-10

-1.7619E-10

5.0344E-12

S2

35.2685

-7.2466E-04

1.1512E-05

7.9267E-08

-1.1460E-08

2.9972E-10

-1.9215E-12

S7

-1.9833

2.3119E-05

2.4807E-06

-1.8482E-07

4.8356E-09

9.3531E-12

-1.4120E-12

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 meniscus lens with positive refractive power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S4 and a concave image-side surface S5. 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 S7 and a convex image-side surface S8. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S8 and a concave image-side surface S9. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens. 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 3. Table 6 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

k

A4

A6

A8

A10

A12

A14

S1

31.5648

-5.0784E-04

8.3650E-07

3.3450E-08

1.6062E-09

-3.6314E-12

-2.4585E-13

S2

-61.2144

-5.7275E-04

6.4896E-06

7.1149E-08

-4.7171E-09

1.7824E-10

-2.2605E-12

S7

-1.6336

2.0079E-05

5.9297E-07

-7.9340E-08

3.3058E-09

-6.4436E-11

4.4103E-13

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

A14

S1

27.6837

-5.1023E-04

9.2873E-07

3.4517E-08

1.6143E-09

-3.2126E-12

-2.2115E-13

S2

0.2588

-6.1000E-04

6.4490E-06

7.1407E-08

-4.6697E-09

1.7971E-10

-2.3018E-12

S7

-1.6245

2.0873E-05

6.0061E-07

-8.0400E-08

3.2494E-09

-6.5352E-11

5.2811E-13

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 meniscus lens with positive refractive power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S4 and a concave image-side surface S5. 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 convex-concave lens with positive refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens L5 is a convex-concave lens having negative refractive power, and has a convex object-side surface S8 and a concave image-side surface S9. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens. 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 5. Table 10 shows conic coefficients and high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

k

A4

A6

A8

A10

A12

A14

S1

35.2685

-4.5477E-04

-2.0917E-08

2.1555E-08

1.8492E-09

-4.5133E-12

-4.2985E-13

S2

-40.5268

-6.0918E-04

6.9117E-06

5.5351E-08

-5.2913E-09

1.8931E-10

-2.3224E-12

S7

-1.7227

1.1780E-05

6.8964E-07

-9.2512E-08

3.0712E-09

-5.9528E-11

4.4470E-13

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

A14

S1

30.2355

-4.5423E-04

-2.6388E-07

2.1804E-08

1.8444E-09

-4.8062E-12

-4.4054E-13

S2

-27.5256

-6.0891E-04

6.9018E-06

5.4742E-08

-5.3066E-09

1.8925E-10

-2.3029E-12

S7

-1.7558

1.1449E-05

7.2007E-07

-9.1550E-08

3.0835E-09

-5.9775E-11

4.1937E-13

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 positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens L2 is a biconcave lens with negative power, and has a concave object-side surface S4 and a concave image-side surface S5. 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 S7 and a convex image-side surface S8. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S8 and a concave image-side surface S9. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens. 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 first lens L1 and the second lens L2 to improve image quality. For example, the stop STO may be disposed near the image side surface S2 of the first lens L1.

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

Watch 13

Flour mark

k

A4

A6

A8

A10

A12

A14

S1

48.5861

-6.3339E-04

-1.4493E-06

-2.3484E-07

1.8014E-10

2.1783E-10

-2.2238E-11

S2

99.3545

-6.9363E-04

1.9308E-06

-1.0381E-07

-8.1446E-10

6.5512E-10

-1.0200E-10

S7

-1.3574

3.7419E-05

1.0997E-06

-1.0674E-07

2.3488E-09

2.2094E-11

-9.4553E-13

TABLE 14

Example 8

An optical lens according to embodiment 8 of the present application is described below with reference to fig. 8. Fig. 8 shows a schematic structural diagram of an optical lens according to embodiment 8 of the present application.

As shown in fig. 8, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4 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

A14

S1

52.0317

-6.4181E-04

-8.9183E-07

-2.0245E-07

1.8920E-10

1.5405E-10

-2.0395E-11

S2

114.6811

-6.6386E-04

7.1951E-07

-8.1687E-08

-4.9545E-09

4.4525E-10

-7.0600E-11

S7

-1.6079

4.3677E-05

1.1533E-06

-1.0599E-07

2.3422E-09

2.2903E-11

-1.0348E-12

TABLE 16

In summary, examples 1 to 8 satisfy the relationships shown in the following tables 17-1 and 17-2, respectively. In tables 17-1 and 17-2, units of TTL, F, H, D, R4, R5, R6, F1, F2, F3, F4, F5, F23, F45 are millimeters (mm), and units of FOV are degrees (°).

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 an optical power;

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

a third lens 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 a positive optical power; and

a fifth lens having a negative optical power.

2. An optical lens as claimed in claim 1, characterized in that the first lens element has a negative optical power and has a concave object-side surface and a concave image-side surface.

3. An optical lens as claimed in claim 1, characterized in that the first lens element has a positive optical power and has a concave object-side surface and a convex image-side surface.

4. An optical lens as claimed in claim 1, characterized in that the first lens element has a positive optical power and has a convex object-side surface and a concave image-side surface.

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

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

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

8. 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.

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

a first lens having an optical power;

a second lens having a negative optical power;

a third lens having a positive optical power;

a fourth lens having a positive optical power; and

a fifth lens having a negative optical power;

wherein, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical lens on the optical axis and a distance BFL between an image side surface of the fifth lens element and the imaging surface of the optical lens on the optical axis satisfy: TTL/BFL is more than or equal to 3.65.

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.