CN112748512A

CN112748512A - Optical lens and electronic device

Info

Publication number: CN112748512A
Application number: CN201911035916.XA
Authority: CN
Inventors: 张俊明; 徐超; 杨佳
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2021-05-04
Anticipated expiration: 2039-10-29
Also published as: CN112748512B

Abstract

The application discloses an optical lens and an electronic device including the same. The optical lens sequentially comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis, wherein the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has optical power; the third lens has focal power, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has optical power; and the sixth lens has optical power. The optical lens can realize at least one of the beneficial effects of small caliber, miniaturization, low cost, small aperture value, small CRA, good temperature applicability and the like.

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 automobile driving assistance systems, the application of optical lenses to automobiles becomes more and more extensive. In the specific application process, on one hand, the market requires that the vehicle-mounted optical lens is continuously miniaturized so as to be convenient for the lens to be installed and used; on the other hand, the on-vehicle optical lens is required to have high performance stability in a large temperature difference environment, so that the automobile auxiliary driving system is suitable for an application environment with large temperature change.

Disclosure of Invention

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

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

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

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

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

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

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

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

In one embodiment, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is concave.

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

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

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

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

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

In one embodiment, the first lens and the fourth lens are both aspheric lenses.

In one embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F/ENPD is more than or equal to 0.7 and less than or equal to 1.4.

In one embodiment, a distance TTL between an object side center of the first lens element and an imaging plane center of the optical lens on the optical axis and a total effective focal length F of the optical lens satisfy: TTL/F is less than or equal to 5.

In one embodiment, a distance TTL between an object-side surface center of the first lens and an imaging surface center of the optical lens on the optical axis, a maximum field angle FOV of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy: TTL/H/FOV is less than or equal to 0.06.

In one embodiment, a maximum field angle FOV of the optical lens, a maximum clear aperture D of an object-side surface of the first lens corresponding to the maximum field angle FOV, and an image height H corresponding to the maximum field angle FOV satisfy: D/H/FOV is less than or equal to 0.03.

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 satisfy: (FOV F)/H.gtoreq.60.

In one embodiment, the thermal coefficient DO of the material from which the third lens is made satisfies: d0| -1.0700E-005.

In one embodiment, a distance d2 between the first lens and the stop on the optical axis and a distance TTL between the center of the object side surface of the first lens and the center of the imaging surface of the optical lens on the optical axis satisfy: d2/TTL is more than or equal to 0.05.

In one embodiment, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: the absolute value of R5/R6 is more than or equal to 0.2 and less than or equal to 2.2.

In one embodiment, the Sg value Sag (S2) corresponding to the maximum clear aperture of the image-side surface of the first lens and the Sg value Sag (S1) corresponding to the maximum clear aperture of the object-side surface of the first lens satisfy: | Sag (S2)/Sag (S1) | ≧ 1.5.

In one embodiment, the Sg value Sag (S7) corresponding to the maximum clear aperture of the object-side surface of the fourth lens and the Sg value Sag (S8) corresponding to the maximum clear aperture of the image-side surface of the fourth lens satisfy: the absolute value of Sag (S7)/Sag (S8) is more than or equal to 0.1 and less than or equal to 1.5.

In one embodiment, a maximum distance value dn between any two adjacent lenses of the second lens to the sixth lens on the optical axis and a distance TTL between an object side center of the first lens and an imaging surface center of the optical lens on the optical axis satisfy: dn/TTL is less than or equal to 0.20.

Another aspect of the present disclosure provides an optical lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens having a negative focal power; the second lens has optical power; the third lens has optical power; the fourth lens has positive optical power; the fifth lens has optical power; and the sixth lens has optical power; wherein the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F/ENPD is more than or equal to 0.7 and less than or equal to 1.4.

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

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

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

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

In one embodiment, the first lens and the fourth lens are both aspheric lenses.

In one embodiment, the optical lens further comprises a diaphragm, the diaphragm is located between the first lens and the second lens, the distance d2 between the first lens and the diaphragm on the optical axis and the distance TTL between the center of the object side surface of the first lens and the center of the imaging surface of the optical lens on the optical axis satisfy: d2/TTL is more than or equal to 0.05.

In one embodiment, a maximum distance value dn between any two adjacent lenses of the second lens to the sixth lens on the optical axis and a distance TTL between an object side surface of the first lens and an image plane of the optical lens on the optical axis satisfy: dn/TTL is less than or equal to 0.20.

The six lenses are adopted, and the shapes, focal powers and the like of the lenses are optimally set, so that the optical lens has at least one beneficial effect of large relative aperture, high relative illumination, large image surface with large angle, small distortion, high image resolution, miniaturization, small CRA and the like.

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, six lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six 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).

The first lens may have a negative power and have a meniscus shape, its object side may be convex, and its image side may be concave. The focal power and the surface type configuration of the first lens are beneficial to collecting incident rays with a large field angle, and ensure that rays enter a rear optical system stably as much as possible, so that the luminous flux is increased, and the imaging quality is improved. In practical application, the vehicle-mounted lens is generally exposed to the external environment, and the meniscus lens protruding towards the object side is beneficial to rain and snow to slide along the lens, so that the service life of the lens is prolonged.

The second lens element can have positive or negative power, and has a convex object-side surface and a concave image-side surface, or both the object-side surface and the image-side surface, or the object-side surface and the image-side surface are convex, or the image-side surface is concave and the image-side surface is convex.

The third lens element can have positive or negative power, and the object-side surface and the image-side surface can be convex at the same time, or the object-side surface and the image-side surface can be concave and convex at the same time.

The fourth lens element can have a positive optical power, and can have a convex object-side surface and a convex image-side surface. The focal power and the surface type of the fourth lens are favorable for converging light rays and adjusting the trend of the light rays, so that the trend of the light rays is in stable transition.

The fifth lens element can have positive or negative power, and can have a convex object-side surface and a concave image-side surface, or both the object-side surface and the image-side surface can be convex, or both the object-side surface and the image-side surface can be concave.

The sixth lens element can have positive or negative power, and can have a convex object-side surface and a concave image-side surface, or both the object-side surface and the image-side surface can be convex, or both the object-side surface and the image-side surface can be concave.

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 beneficial to effectively collecting light rays entering the optical system, shortening the total length of the system and reducing the aperture of the lens. In the embodiment of the present application, the stop may be disposed 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 sixth 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 sixth lens and the imaging surface to prevent internal elements (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 use of the cemented lens in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby 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 is cemented with the third lens with the convex object-side surface and the convex image-side surface; the second lens with the convex object side surface and the convex image side surface is glued with the third lens with the concave object side surface and the convex image side surface; and the second lens with the concave object-side surface and the convex image-side surface is cemented with the third lens with the concave object-side surface and the convex image-side surface. In this embodiment, the second lens is made of a low abbe number material, and the third lens is made of a high abbe number material. The second lens and the third lens are arranged in a matched mode, and chromatic aberration of the system can be eliminated.

In an exemplary embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens. The fifth lens with the convex object-side surface and the concave image-side surface is cemented with the sixth lens with the convex object-side surface and the concave image-side surface; the fifth lens with the convex object side surface and the convex image side surface is glued with the sixth lens with the concave object side surface and the concave image side surface; and the fifth lens with the concave object-side surface and the concave image-side surface is cemented with the sixth lens with the convex object-side surface and the convex image-side surface. The combination mode of the fifth lens with positive focal power in front and the sixth lens with negative focal power in back is favorable for smoothly transferring the light rays passing through the fourth lens to the sixth lens, and the total length of the optical system and the size of the rear port diameter of the lens are reduced. In this embodiment, the fifth lens is made of a high abbe number material, and the sixth lens is made of a low abbe number material. The fifth lens and the sixth lens are arranged in a matched mode, and chromatic aberration of the system can be eliminated. The gluing mode adopted between the lenses has at least one of the following advantages: self color difference is reduced, tolerance sensitivity is reduced, and the integral color difference of the system is balanced through the residual partial color difference; reducing the air space between the two lenses, thereby reducing the overall length of the system; the assembling parts between the lenses are reduced, so that the working procedures are reduced, and the cost is reduced; the tolerance sensitivity problems of inclination/core deviation and the like generated in the assembling process of the lens unit are reduced, and the production yield is improved; the light quantity loss caused by reflection among the lenses is reduced, and the illumination is improved; further reducing the curvature of field and effectively correcting the off-axis point aberration of the optical lens. The gluing design shares the whole chromatic aberration correction of the system, effectively corrects the aberration so as to improve the resolving power, and enables the optical system to be compact as a whole and meet the miniaturization requirement.

In an exemplary embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: 0.7 ≦ F/ENPD ≦ 1.4, e.g., 0.8 ≦ F/ENPD ≦ 1.3. The proportional relation between the total effective focal length of the optical lens and the diameter of the entrance pupil of the optical lens is reasonably set, and the optical system is favorable for collecting more incident light rays.

In an exemplary embodiment, a distance TTL on the optical axis from an object side surface center of the first lens to an imaging surface center of the optical lens and a total effective focal length F of the optical lens satisfy: TTL/F ≦ 5, e.g., TTL/F ≦ 4.8. In the present application, the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical lens is also referred to as the total length of the optical lens. The proportional relation between the total length of the optical lens and the total effective focal length is reasonably controlled, so that the optical lens has better performance, and the miniaturization of the lens is realized.

In an exemplary embodiment, a distance TTL from an object side surface center of the first lens to an imaging surface center of the optical lens on the optical axis, a maximum field angle FOV of the optical lens, and an image height H corresponding to the maximum field angle FOV satisfy: TTL/H/FOV ≦ 0.06, e.g., TTL/H/FOV ≦ 0.05. The mutual relation among the three is reasonably set, and the miniaturization of the lens is favorably realized.

In an exemplary embodiment, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle FOV, and the image height H corresponding to the maximum field angle FOV satisfy: D/H/FOV ≦ 0.03, for example, D/H/FOV ≦ 0.02. The mutual relation among the three is reasonably set, the front end caliber of the optical lens is easy to reduce, and miniaturization is realized.

In an exemplary 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 satisfy: (FOV F)/H.gtoreq.60, for example, (FOV F)/H.gtoreq.65. The mutual relation of the three is reasonably set, so that the optical lens has the characteristics of large field angle and long focus, and the balanced design of the large field angle and the long focus is realized.

In an exemplary embodiment, the thermal coefficient DO of the material from which the third lens is made satisfies: d0| -1.0700E-005. The third lens is made of a material with high thermal coefficient, and is beneficial to realizing system thermal compensation.

In an exemplary embodiment, the optical lens further comprises a diaphragm, the diaphragm is positioned between the first lens and the second lens, the distance d2 between the first lens and the diaphragm on the optical axis and the distance TTL between the center of the object side surface of the first lens and the center of the imaging surface of the optical lens on the optical axis satisfy: d2/TTL ≧ 0.05, for example, d2/TTL ≧ 0.08. The proportional relation between the distance between the first lens and the diaphragm on the optical axis and the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis is reasonably set, so that the central distance between the adjacent lenses is large, the smooth transition of light rays near the diaphragm is realized, and the image quality of an optical system is improved.

In an exemplary embodiment, the first lens may be made of a high refractive index material. For example, the refractive index Nd1 of the first lens satisfies: nd1 ≧ 1.65, for example, Nd1 ≧ 1.68. The material selection of the first lens is beneficial to reducing the front end aperture of the optical system and improving the imaging quality of the optical system.

In an exemplary embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.2. ltoreq. R5/R6. ltoreq.2.2, for example 0.4. ltoreq. R5/R6. ltoreq.2.0. The proportional relation between the curvature radius of the object side surface of the third lens and the curvature radius of the image side surface of the third lens is reasonably set, so that the curvature radii of the object side surface and the image side surface of the lens are close, light rays can smoothly enter an optical system, and the resolution quality of the system is improved.

In an exemplary embodiment, the Sg value Sag (S2) corresponding to the maximum clear aperture of the image-side surface of the first lens and the Sg value Sag (S1) corresponding to the maximum clear aperture of the object-side surface of the first lens satisfy: | Sag (S2)/Sag (S1) | ≧ 1.5, for example, | Sag (S2)/Sag (S1) | ≧ 1.8. The proportional relation between the Sg value corresponding to the maximum clear aperture of the image side surface of the first lens and the Sg value corresponding to the maximum clear aperture of the object side surface of the first lens is reasonably set, so that the object side surface of the first lens is gentle, the image side surface of the first lens is curved, the incident light in an optical system can be compressed, a small aperture value is realized, and the aperture of the optical system is reduced.

In an exemplary embodiment, the Sg value Sag (S7) corresponding to the maximum clear aperture of the object-side surface of the fourth lens and the Sg value Sag (S8) corresponding to the maximum clear aperture of the image-side surface of the fourth lens satisfy: 0.1. ltoreq. Sag (S7)/Sag (S8. ltoreq. 1.5, for example,

the absolute value of Sag (S7)/Sag (S8) is more than or equal to 0.2 and less than or equal to 1.2. The proportional relation between the Sg value corresponding to the maximum clear aperture of the object side surface of the fourth lens and the Sg value corresponding to the maximum clear aperture of the image side surface of the fourth lens is reasonably set, so that the shape of the object side surface and the shape of the image side surface of the fourth lens are close, the smooth transition of peripheral light rays is realized, and the reduction of the sensitivity of the lenses is facilitated.

In an exemplary embodiment, a maximum pitch value dn among pitches on the optical axis of any two adjacent lenses of the second lens to the sixth lens and a distance TTL on the optical axis from an object side surface center of the first lens to an imaging surface center of the optical lens satisfy: dn/TTL ≦ 0.20, e.g., dn/TTL ≦ 0.15. The proportional relation between the maximum distance value of the distance between any two adjacent lenses in the second lens to the sixth lens on the optical axis and the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis is reasonably set, the distance between the lenses is reduced, and the miniaturization of the lens is facilitated.

In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: i F1/F | ≧ 5.0, e.g., | F1/F | ≧ 3.0. The proportional relation between the effective focal length of the first lens and the total effective focal length of the optical lens is reasonably set, so that more light rays can stably enter the optical system, and the illumination of the system is increased.

In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: i F4/F | ≧ 1.0, e.g., | F4/F | ≧ 1.2. The proportional relation between the effective focal length of the fourth lens and the total effective focal length of the optical lens is reasonably set, and the balance of various aberrations in the optical system is favorably realized.

In an exemplary embodiment, the first lens and the fourth lens are both aspheric lenses. 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. In this embodiment, the first lens and the fourth lens are both aspheric lenses, which is beneficial to improving the resolution quality of the optical system.

According to the optical lens of the above embodiment of the application, through reasonable arrangement of the shapes and focal powers of the lenses and reasonable collocation of the spherical surface and the aspherical surface, the lens is miniaturized, the assembly is convenient, and the resolution quality and the thermal stability of the system are improved. Meanwhile, the arrangement of the plurality of cemented lenses is beneficial to correcting system aberration and improving the system resolving power, and is also beneficial to enabling the whole structure of the optical system to be compact, realizing the miniaturization of the lens, reducing the tolerance sensitivity of the lens and facilitating assembly.

According to the optical lens of the embodiment of the application, on the basis of meeting the small aperture value (0.7-1), the first lens shape is controlled, so that the front end of the lens has a smaller aperture; meanwhile, a diaphragm is arranged between the first lens and the second lens, and the aperture of the front end of the lens is further reduced; the camera lens of this application only uses 6 lens, has reduced the camera lens cost, has reduced camera lens length simultaneously by a wide margin, has realized that the camera lens is miniaturized, is convenient for realize the assembly in finite space in some special fields. The optical lens can be designed by adopting all-glass, has a wide working temperature range, is suitable for a working environment of-40-105 ℃, and has stable optical performance.

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 six lenses are exemplified in the embodiment, the optical lens is not limited to include six lenses. The optical lens may also include other numbers of lenses, if desired.

Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with negative power, with the object side S4 being convex and the image side S5 being concave. 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 meniscus lens with positive power, with the object side S9 being convex and the image side S10 being concave. The sixth lens element L6 is a meniscus lens element with negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens, and the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the 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.

In the present embodiment, both the object-side and image-side surfaces of the first lens L1 and the fourth lens L4 may be aspheric.

Optionally, the optical lens may further include a filter L6 and/or a protective glass L6 'having an object side S12 and an image side S13, 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 S14. The light from the object sequentially passes through the respective surfaces S1 to S13 and is finally imaged on the imaging surface S14.

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

The present embodiment adopts six lenses as an example, and by reasonably allocating the focal power and the surface type of each lens, the center thickness of each lens, and the air space between each lens, the lens can have at least one of the advantages of high resolution, miniaturization, small front end aperture, small CRA, good temperature performance, and the like. Each aspherical surface type Z is defined by the following formula:

wherein Z is the distance rise from the vertex of the aspheric surface 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 the conic coefficient conc; A. b, C, D, E are all high order term coefficients. Table 2 below shows the conic coefficients K and the high-order term coefficients A, B, C, D and E of the aspherical lens surfaces S1, S2, S7, and S8 usable in example 1.

Flour mark

K

A

B

C

D

E

S1

-0.1105

-1.7006E-03

-7.9418E-05

5.8422E-06

-1.9136E-07

2.4441E-09

S2

-1.0173

-7.0452E-04

-2.7725E-04

3.5730E-05

-1.9718E-06

4.2993E-08

S7

-3.3111

-1.4297E-05

4.5378E-06

-2.6610E-07

5.8481E-09

-4.9431E-11

S8

-0.6647

1.8976E-04

-4.7289E-07

-5.5798E-08

1.6570E-09

-1.7312E-11

TABLE 2

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

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 3

The conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S7 and S8 in example 2 are given in table 4 below.

Flour mark

K

A

B

C

D

E

S1

-0.1575

-1.7460E-03

-7.9321E-05

5.9049E-06

-1.8746E-07

2.2570E-09

S2

-1.0227

-7.6343E-04

-2.7826E-04

3.5976E-05

-1.9817E-06

4.1847E-08

S7

-7.0210

-1.4241E-05

4.8728E-06

-2.7213E-07

5.5754E-09

-4.6724E-11

S8

-0.6590

1.8906E-04

-6.9159E-07

-5.7158E-08

1.6170E-09

-1.7270E-11

TABLE 4

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. The third lens L3 is a meniscus lens with negative power, with the object side S5 being concave and the image side S6 being convex. 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 meniscus lens with negative power, with the object side S9 being convex and the image side S10 being concave. The sixth lens L6 is a meniscus lens with positive power, with the object side S10 being convex and the image side S11 being concave. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens, and the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 5 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3.

TABLE 5

The conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S7 and S8 in example 3 are given in table 6 below.

Flour mark

K

A

B

C

D

E

S1

-0.2047

-1.7815E-03

-7.6123E-05

5.6754E-06

-1.9392E-07

2.4525E-09

S2

-1.0298

-7.8590E-04

-2.6638E-04

3.4508E-05

-2.1459E-06

4.8063E-08

S7

-4.0502

-3.4756E-05

5.5327E-06

-2.4490E-07

5.9439E-09

-3.9213E-11

S8

-0.7778

2.0490E-04

-2.2848E-07

-4.5990E-08

2.0881E-09

-8.7881E-12

TABLE 6

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

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 7

The conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S7 and S8 in example 4 are given in table 8 below.

TABLE 8

Example 5

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

As shown in fig. 5, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with positive power, with the object side S4 being concave and the image side S5 being convex. The third lens L3 is a meniscus lens with positive power, with the object side S5 being concave and the image side S6 being convex. 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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a biconcave lens with negative power, and has a concave object-side surface S10 and a concave image-side surface S11. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens, and the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 9 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5.

TABLE 9

The conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S7 and S8 in example 5 are given in table 10 below.

Flour mark

K

A

B

C

D

E

S1

-0.0652

-1.9532E-03

-3.0025E-05

3.8083E-06

-1.5498E-07

2.3202E-09

S2

-1.1337

-5.7562E-04

-9.9774E-05

1.9221E-05

-1.2666E-06

3.3408E-08

S7

-2.8488

-8.4408E-05

2.7806E-06

-1.8869E-07

4.7784E-09

-5.2055E-11

S8

-0.3712

1.5508E-04

1.0032E-06

-8.4644E-08

2.2335E-09

-2.5747E-11

Watch 10

Example 6

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

As shown in fig. 6, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

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 11

The conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S7 and S8 in example 6 are given in table 12 below.

Flour mark

K

A

B

C

D

E

S1

-0.5174

-2.6287E-03

-5.7757E-05

6.1209E-06

-2.2029E-07

3.0385E-09

S2

-1.3230

-1.1225E-03

-1.6955E-04

2.5029E-05

-1.3793E-06

2.9314E-08

S7

-2.8224

-9.3832E-05

1.7075E-06

-1.9459E-07

5.2386E-09

-6.2626E-11

S8

-0.1281

3.1803E-05

1.3623E-06

-8.2986E-08

1.8879E-09

-2.0211E-11

TABLE 12

Example 7

An optical lens according to embodiment 7 of the present application is described below with reference to fig. 7. Fig. 7 shows a schematic structural diagram of an optical lens according to embodiment 7 of the present application.

As shown in fig. 7, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave. The second lens L2 is a meniscus lens with positive power, with the object side S4 being concave and the image side S5 being convex. The third lens L3 is a meniscus lens with positive power, with the object side S5 being concave and the image side S6 being convex. 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 S9 and a concave image-side surface S10. The sixth lens element L6 is a biconvex lens with positive refractive power, and has a convex object-side surface S10 and a convex image-side surface S11. The second lens L2 and the third lens L3 may be cemented to constitute a cemented lens, and the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.

Table 13 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 7.

Watch 13

The conic coefficients K and the high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S1, S2, S7 and S8 in example 7 are given in table 14 below.

Flour mark

K

A

B

C

D

E

S1

-3.3327

-1.9806E-03

-1.1775E-05

3.7185E-06

-1.3433E-07

1.6216E-09

S2

-1.3419

-1.4010E-03

-3.0192E-05

1.3701E-05

-7.7303E-07

1.5117E-08

S7

-2.2432

-1.5126E-04

2.3594E-06

-1.6431E-07

4.2917E-09

-4.5853E-11

S8

-0.4871

1.6796E-04

5.4689E-07

-9.6676E-08

2.6400E-09

-2.7853E-11

TABLE 14

Example 8

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

As shown in fig. 8, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a sixth lens element L6.

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.

Watch 15

The conic coefficients K and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S7 and S8 in example 8 are given in table 16 below.

Flour mark

K

A

B

C

D

E

S1

-3.0841

-2.0328E-03

-1.1593E-05

3.7408E-06

-1.3549E-07

1.6436E-09

S2

-1.3480

-1.3572E-03

-2.9460E-05

1.3387E-05

-7.5236E-07

1.4745E-08

S7

-2.1170

-1.4810E-04

2.4020E-06

-1.6424E-07

4.2877E-09

-4.5413E-11

S8

-0.4974

1.7382E-04

5.3617E-07

-9.6082E-08

2.6555E-09

-2.8044E-11

TABLE 16

In summary, examples 1 to 8 each satisfy the relationship shown in table 17 below. In table 17, TTL, EPD, H, F1, F4, D, R5, R6, d2, d6, d8, d11 are in units of millimeters (mm), and FOV is in units of degrees (°).

TABLE 17

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. An optical lens, in order from an object side to an image side along an optical axis, comprising: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that:

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

the second lens has optical power;

the third lens has focal power, and the image side surface of the third lens is a convex surface;

the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;

the fifth lens has optical power; and

the sixth lens has optical power.

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

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

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

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

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

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

9. An optical lens, in order from an object side to an image side along an optical axis, comprising: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that:

the first lens has a negative optical power;

the second lens has optical power;

the third lens has optical power;

the fourth lens has positive optical power;

the fifth lens has optical power; and

the sixth lens has optical power; wherein the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy:

0.7≤F/ENPD≤1.4。

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.