CN112147754B

CN112147754B - Optical lens and electronic device

Info

Publication number: CN112147754B
Application number: CN201910579118.7A
Authority: CN
Inventors: 赵哲; 王东方
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2022-01-07
Anticipated expiration: 2039-06-28
Also published as: CN112147754A

Abstract

The application discloses an optical lens and an electronic device including the same. The optical lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, 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 negative focal power, and the object side surface of the second lens is a concave surface; the third lens has positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power, and 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 negative focal power, and the object side surface of the fifth lens is a concave surface; and the sixth lens has focal power, and the object side surface of the sixth lens is a convex surface and the image side surface of the sixth lens is a concave surface. The optical lens can achieve at least one of the advantages of high resolution, miniaturization, low cost, long-distance high-definition imaging 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

With the rapid development of the driving assistance system of the automobile, the optical lens plays an increasingly important role therein. The optical lens is widely applied to an intelligent driving system and serves as a foundation of a coma system. Due to the consideration of safety, the optical lens for vehicle-mounted applications has more strict requirements on optical parameters in some aspects, especially the requirements on the performance and reliability of the optical lens are higher and higher. There is a need for an optical lens that is compatible with resolving power and miniaturization.

Disclosure of Invention

One 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 negative focal power, and the object side surface of the second lens is a concave surface; the third lens has positive focal power, and the object 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 negative focal power, and the object side surface of the fifth lens is a concave surface; and the sixth lens has focal power, and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface.

In one embodiment, the image side surface of the second lens is convex.

In one embodiment, the image side surface of the second lens is concave.

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

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

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

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

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 sixth lens has a positive optical power.

In one embodiment, the sixth lens has a negative optical power.

In one embodiment, the sixth lens is an aspherical lens.

In one embodiment, a stop is disposed between the third lens and the fourth lens.

In one embodiment, a total length TTL of the optical lens and a total effective focal length F of the optical lens satisfy: TTL/F is less than or equal to 4.5.

In one embodiment, a distance BFL from an image-side surface of the sixth lens element to an image plane of the optical lens and a distance TL from an object-side surface of the first lens element to an image-side surface of the sixth lens element satisfy: BFL/TL is more than or equal to 0.2.

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, and an image height H corresponding to the maximum field angle satisfy: D/H/FOV is less than or equal to 0.035.

In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: F3/F is less than or equal to 4.

In one embodiment, a combined focal length F45 of the fourth lens and the fifth lens and a total effective focal length F of the optical lens satisfy: F45/F is less than or equal to 5.

In one embodiment, a distance d56 between the fifth lens and the sixth lens on the optical axis and a total length TTL of the optical lens satisfy: d56/TTL is more than or equal to 0.01 and less than or equal to 0.2.

In one embodiment, a center thickness T6 of the sixth lens on the optical axis and a total length TTL of the optical lens satisfy: T6/TTL is more than or equal to 0.09.

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 satisfy: (FOV F)/H is less than or equal to 70.

In one embodiment, a central radius of curvature R31 of an object-side surface of the third lens and a central radius of curvature R32 of an image-side surface of the third lens satisfy: the absolute value of R31/R32 is more than or equal to 0.2 and less than or equal to 1.2.

In one embodiment, a central radius of curvature R32 of an image-side surface of the third lens and a central radius of curvature R41 of an object-side surface of the fourth lens satisfy: and | (| R32| - | R41|)/(| R32| + | R41|) | is less than or equal to 0.5.

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 a negative optical power; the third lens has positive optical power; the fourth lens has positive optical power; the fifth lens has a negative optical power; and the sixth lens has optical power, wherein: the total length TTL of the optical lens and the total effective focal length F of the optical lens meet the following conditions: TTL/F is less than or equal to 4.5.

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 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 second lens is concave, and the image side surface of the second lens 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 convex and the image-side surface of the third lens element is concave.

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 fifth lens element has a concave object-side surface and a convex 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 concave.

In one embodiment, the sixth lens has a positive optical power.

In one embodiment, the sixth lens has a negative optical power.

In one embodiment, the sixth lens is an aspherical lens.

Still another aspect of the present application provides an electronic device that may include the optical lens according to the above embodiment and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

The six lenses are adopted, and the shape, focal power and the like of each lens are optimally set, so that the optical lens has at least one beneficial effect of high resolution, miniaturization, low cost, long-distance high-definition imaging 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; and

fig. 6 is a schematic view showing a structure of an optical lens according to embodiment 6 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.

An optical lens according to an exemplary embodiment of the present application 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.

The optical lens according to the exemplary embodiment of the present application 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 can reduce the incident angle of incident light on the attack surface, and are beneficial to collecting more light rays into an optical system, thereby increasing the luminous flux, improving the illumination and realizing higher imaging quality. 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 a negative power, and can have a concave object-side surface and a convex or concave image-side surface. The third lens element can have a positive optical power, and can have a convex object-side surface and a convex or concave image-side surface. The second lens and the third lens are matched with each other, the lens with negative focal power is in front, the lens with positive focal power is behind, the front light can be diverged and then rapidly converged, and then the front light is transited to a rear optical system. The combination of focal powers is beneficial to reduce the optical path of the rear ray and obtain shorter overall length of the system. In addition, according to the embodiments of the present disclosure, the refractive index of the material of the second lens may be set lower than the refractive index of the material of the third lens. The configuration can enable incident light rays to be more smoothly transited to a rear optical system, is beneficial to reducing the aperture of a lens, increasing the aperture of a diaphragm and increasing the light flux of the system, and therefore higher picture brightness is achieved.

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 adoption of the biconvex lens in the optical lens can compress the angle of incident light, realize the smooth transition of light, be favorable to reducing the rear end lens bore for light can steadily get into rear optical system, improves the resolution quality.

The fifth lens element can have a negative power, and can have a concave object-side surface and a convex or concave image-side surface. The combination of the surface type and the focal power of the fourth lens and the fifth lens can effectively converge the light rays incident from the front end, so that the light rays are smoothly transited to the sixth lens, and the reduction of the caliber of the rear end lens and the increase of the focal length of the lens are facilitated.

The sixth lens is a meniscus lens with focal power, the object side surface of the sixth lens can be a convex surface, the image side surface of the sixth lens can be a concave surface, and light rays passing through the front optical system can be converged into an imaging surface so as to obtain stronger image surface illumination and improve the imaging quality of the optical system.

According to the embodiment of the application, the diaphragm used for limiting the light beam is arranged between the third lens and the fourth lens, and the imaging quality of the optical lens is further improved. When the diaphragm is arranged between the third lens and the fourth lens, the diaphragm can be beneficial to effectively collecting light rays entering the optical 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 fourth lens. It should be noted, however, that the positions of the diaphragms disclosed herein are merely examples and not limitations; in alternative embodiments, the diaphragm may be disposed at other positions according to actual needs.

In an exemplary embodiment, the optical lens according to the present application may further include a filter disposed between the 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.

According to the embodiment of the present application, the second lens and the third lens are cemented to form the cemented lens. The image side surface of the second lens in the cemented lens is a concave surface, and the object side surface of the third lens is a convex surface, so that the lens has a compact structure, and the miniaturization of an optical system is facilitated.

According to the embodiment of the present application, the fourth lens and the fifth lens are cemented to form the cemented lens. The fourth lens in the cemented lens has positive focal power and can be made of a low-refractive-index high-Abbe-number material; the fifth lens has a negative power and may be made of a high refractive index low abbe number material. The combination of the fourth lens with positive focal power and the fifth lens with negative focal power can reduce self chromatic aberration, reduce tolerance sensitivity and balance the whole chromatic aberration of the system through residual partial chromatic aberration. Meanwhile, the fast transition of the front light to the rear lens is facilitated, the aperture of the diaphragm is increased, and the light flux of the system is further improved.

In addition, the gluing mode adopted between the lenses also has at least one of the following advantages: 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.

According to the embodiment of the present application, the total length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: TTL/F ≦ 4.5, e.g., TTL/F ≦ 4.0. The proportional relation between the total length of the optical lens and the total effective focal length is reasonably controlled, and the miniaturization of the system is favorably realized.

According to the embodiment of the present application, a distance BFL from an image-side surface of the sixth lens element to an image plane of the optical lens and a distance TL from an object-side surface of the first lens element to the image-side surface of the sixth lens element satisfy: BFL/TL is ≧ 0.2, e.g., BFL/TL is ≧ 0.25. The proportional relation between the back focal length of the optical lens and the length of the lens group of the optical lens is reasonably controlled, and the assembly of the module is facilitated on the basis of realizing the miniaturization of a system. When the length of the lens group is short, the structure of the optical system is compact, the sensitivity of the lens to Modulation Transfer Function (MTF) is reduced, the production yield of products is improved, and the production cost is reduced. Wherein, the back focal length of the optical lens is BFL; the lens group length of the optical lens is TL.

According to the embodiment of the present application, the maximum field angle FOV of the optical lens, the maximum light transmission aperture D of the object-side surface of the first lens corresponding to the maximum field angle, and the image height H corresponding to the maximum field angle satisfy: D/H/FOV ≦ 0.035, for example, D/H/FOV ≦ 0.03. 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.

According to the embodiment of the application, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: F3/F.ltoreq.4, for example F3/F.ltoreq.3.6. And the focal length of the third lens is reasonably reduced, so that the optical lens is favorably miniaturized.

According to the embodiment of the application, the combined focal length F45 of the fourth lens and the fifth lens and the total effective focal length F of the optical lens satisfy: F45/F.ltoreq.5, for example F45/F.ltoreq.4.5. The proportional relation between the combined focal length F45 of the fourth lens and the fifth lens and the total effective focal length F of the optical lens is reasonably controlled, so that the aberration caused by the entering of large-angle light rays is favorably reduced, the structure between the lenses is more compact, and the miniaturization of the optical lens is favorably realized.

According to the embodiment of the present application, the distance d56 between the fifth lens element and the sixth lens element on the optical axis and the total length TTL of the optical lens system satisfy: 0.01. ltoreq. d 56/TTL. ltoreq.0.2, for example, 0.02. ltoreq. d 56/TTL. ltoreq.0.18. The distance between the fifth lens and the sixth lens is controlled to be within a reasonable data range, so that the light is smooth and excessive, and the image quality is improved.

According to the embodiment of the present application, the center thickness T6 of the sixth lens element on the optical axis and the total length TTL of the optical lens system satisfy: T6/TTL ≧ 0.09, for example, T6/TTL ≧ 0.095. The lens L6 is large in central thickness and ensures smooth emergence of light rays.

According to the embodiment of the application, 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 of the optical lens satisfy: (FOV F)/H.ltoreq.70, for example, (FOV F)/H.ltoreq.68. The mutual relation of the three is reasonably set, so that the optical system has the characteristic of small distortion.

According to the embodiment of the present application, the center radius of curvature R31 of the object-side surface of the third lens and the center radius of curvature R32 of the image-side surface of the third lens satisfy: 0.2. ltoreq. R31. ltoreq. R32. ltoreq.1.2, for example 0.4. ltoreq. R31. ltoreq. R32. ltoreq.1. The shape of the third lens is reasonably set by controlling the proportional relation between the central curvature radius of the object side surface of the third lens and the central curvature radius of the image side surface of the third lens, so that light rays can smoothly enter a rear light ray system through the third lens.

According to the embodiment of the present application, the center radius of curvature R32 of the image-side surface of the third lens and the center radius of curvature R41 of the object-side surface of the fourth lens satisfy: i (| R32| - | R41|)/(| R32| + | R41|) | ≦ 0.5, for example, the above-mentioned correlation of the two may also satisfy: and | (| R32| - | R41|)/(| R32| + | R41|) | is less than or equal to 0.45. The mutual relation between the central curvature radius of the image side surface of the third lens and the central curvature radius of the object side surface of the fourth lens is reasonably controlled, so that the aberration of the optical system is favorably corrected, and the incident angle is not too large when the light emitted from the third lens enters the object side surface of the fourth lens, so that the tolerance sensitivity of the optical system is reduced.

According to the embodiment of the present application, the sixth lens is an aspherical lens. 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 sixth lens element in the optical lens system of the present application can be an aspheric lens element, which helps to correct system aberration and improve resolution.

According to the optical lens of the above embodiment of the application, the lens shape is optimally set, the focal power is reasonably distributed, the long-distance high-definition imaging can be realized by using the six-piece structure, and the requirements of miniaturization, small distortion, high resolution, low cost and the like of the lens can be considered. The vehicle-mounted front-view lens meets the application requirements of miniaturization, high resolution and remote high-definition imaging.

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 biconcave lens with negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S4 and a convex image-side surface S5. 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 S8 being concave and the image side S9 being convex. 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. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the object side S7 of the fourth lens L4.

In the present embodiment, both the object-side surface and the image-side surface of the sixth lens L6 may be aspheric.

Optionally, the optical lens may further include a filter L7 or a cover glass having an object side S12 and an image side S13. The filter L7 may be used to correct color deviation, and the cover glass may be used to protect the image sensing chip IMA at the imaging plane. The light from the object passes through the respective surfaces S1 to S13 in order and is finally imaged on the imaging plane.

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 space 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 that can be used for the aspherical lens surfaces S10 and S11 in example 1.

Flour mark

K

A

B

C

D

E

S10

1.4951

1.3265E-03

5.3919E-05

-6.0268E-06

6.8452E-07

-4.1544E-08

S11

-25.3563

5.0189E-03

1.3523E-04

-2.3715E-06

2.2156E-07

-9.7259E-08

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 S10 and S11 in example 2 are given in table 4 below.

Flour mark

K

A

B

C

D

E

S10

2.6866

6.0625E-03

4.5527E-05

-5.5837E-06

4.5926E-07

-1.2222E-08

S11

-13.8187

5.2278E-03

1.4439E-04

1.5856E-07

1.2706E-06

-1.2989E-08

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 meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a meniscus lens with negative power, with the object side S9 being concave and the image side S10 being convex. The sixth lens element L6 is a meniscus lens element with negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The fourth lens L4 and the fifth lens L5 may be cemented to constitute a cemented lens.

The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the object side S8 of the fourth lens L4.

Optionally, the optical lens may further include a filter L7 or a cover glass having an object side S13 and an image side S14. The filter L7 may be used to correct color deviation, and the cover glass may be used to protect the image sensing chip IMA at the imaging plane. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane.

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 high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S11 and S12 in example 3 are given in table 6 below.

Flour mark

K

A

B

C

D

E

S11

-1.2555

-5.4631E-05

-1.1287E-04

-9.1485E-06

4.8190E-06

2.0893E-07

S12

-5.6843

5.2276E-03

-7.4026E-05

-2.8075E-05

3.7953E-06

-5.7805E-07

TABLE 6

Example 4

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

As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, 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 high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S11 and S12 in example 4 are given in table 8 below.

Flour mark

K

A

B

C

D

E

S11

-8.5486

-6.2083E-05

-1.1396E-04

-9.1949E-06

1.1675E-06

-8.8217E-08

S12

-2.3655

7.1820E-03

-8.1809E-05

-2.5665E-05

3.8870E-06

-2.3795E-07

TABLE 8

Example 5

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

As shown in fig. 5, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, 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 S3 being concave and the image side S4 being convex. The third lens L3 is a meniscus lens with positive power, with the object side S5 being convex and the image side S6 being concave. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. The 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 9

The conic coefficients K and high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S11 and S12 in example 5 are given in table 10 below.

Flour mark

K

A

B

C

D

E

S11

-1.5723

9.5212E-04

-2.0257E-04

-2.3207E-05

-7.0714E-06

1.6709E-07

S12

-0.2356

9.1236E-03

-3.1233E-04

-7.2712E-05

7.1793E-07

4.9216E-07

Watch 10

Example 6

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

As shown in fig. 6, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, 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 high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S11 and S12 in example 4 are given in table 12 below.

Flour mark

K

A

B

C

D

E

S11

-2.9512

1.2909E-04

-2.1744E-04

-2.2844E-05

-1.0196E-06

4.7418E-08

S12

-3.5513

5.0369E-03

-5.5979E-04

-6.8349E-05

7.8959E-06

4.5117E-07

TABLE 12

In summary, examples 1 to 6 each satisfy the relationship shown in table 13 below. In table 13, TTL, F, BFL, D, TL, H, R31, R32, R41, D56, F2-F5, F45, T6 are in units of millimeters (mm), and FOV is in units of degrees (°).

Watch 13

The present application also provides an electronic device that may include an optical lens according to the above-described embodiments of the present application. 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 negative focal power, and the object side surface of the second lens is a concave surface;

the third lens has positive focal power, and the object 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 negative focal power, and the object side surface of the fifth lens is a concave surface; and

the sixth lens has focal power, the object side surface of the sixth lens is a convex surface, the image side surface of the sixth lens is a concave surface,

wherein 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 satisfy: 51.4569 degrees is less than or equal to (FOV multiplied by F)/H is less than or equal to 70 degrees,

wherein the fourth lens and the fifth lens are cemented to form a cemented lens, an

Wherein the number of lenses having power in the optical lens is six.

2. An optical lens barrel according to claim 1, wherein the image side surface of the second lens element is convex.

3. An optical lens barrel according to claim 1, wherein the image side surface of the second lens is concave.

4. An optical lens barrel according to claim 1, wherein the image side surface of the third lens element is convex.

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

6. An optical lens barrel according to claim 1, wherein the image side surface of the fifth lens element is convex.

7. An optical lens barrel according to claim 1, wherein the image side surface of the fifth lens element is concave.

8. An optical lens according to claim 3, wherein the second lens and the third lens are cemented to form a cemented lens.

9. An optical lens according to claim 1, characterized in that the sixth lens has a positive optical power.

10. An optical lens according to claim 1, characterized in that the sixth lens has a negative optical power.

11. An optical lens according to claim 1, characterized in that the sixth lens is an aspherical lens.

12. An optical lens according to any one of claims 1 to 11, wherein the total length TTL of the optical lens and the total effective focal length F of the optical lens satisfy:

TTL/F≤4.5。

13. an optical lens barrel according to any one of claims 1 to 11, wherein a distance BFL from an image-side surface of the sixth lens element to an image plane of the optical lens barrel and a distance TL from an object-side surface of the first lens element to the image-side surface of the sixth lens element satisfy:

BFL/TL≥0.2。

14. an optical lens according to any one of claims 1 to 11, wherein 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, and the image height H corresponding to the maximum field angle satisfy:

D/H/FOV×180°≤6.3。

15. an optical lens according to any one of claims 1 to 11, characterized in that the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy:

F3/F≤4。

16. an optical lens according to any one of claims 1 to 11, characterized in that the combined focal length F45 of the fourth lens and the fifth lens and the total effective focal length F of the optical lens satisfy:

F45/F≤5。

17. an optical lens barrel according to any one of claims 1 to 11, wherein a distance d56 between the fifth lens element and the sixth lens element on the optical axis and a total length TTL of the optical lens barrel satisfy:

0.01≤d56/TTL≤0.2。

18. an optical lens barrel according to any one of claims 1 to 11, wherein a center thickness T6 of the sixth lens element on the optical axis and a total length TTL of the optical lens barrel satisfy:

T6/TTL≥0.09。

19. an optical lens barrel according to any one of claims 1 to 11, wherein the central radius of curvature R31 of the object side surface of the third lens and the central radius of curvature R32 of the image side surface of the third lens satisfy:

0.2≤|R31|/|R32|≤1.2。

20. an optical lens barrel according to any one of claims 1 to 11, wherein the central radius of curvature R32 of the image side surface of the third lens and the central radius of curvature R41 of the object side surface of the fourth lens satisfy:

|(|R32|-|R41|)/(|R32|+|R41|)|≤0.5。

21. 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 a negative optical power;

the third lens has positive optical power;

the fourth lens has positive optical power;

the fifth lens has a negative optical power; and

the sixth lens has an optical power, wherein:

the total length TTL of the optical lens and the total effective focal length F of the optical lens meet the following conditions:

TTL/F≤4.5，

Wherein the number of lenses having power in the optical lens is six.

22. An optical lens barrel according to claim 21, wherein the first lens element has a convex object-side surface and a concave image-side surface.

23. An optical lens barrel according to claim 21, wherein the second lens element has a concave object-side surface and a convex image-side surface.

24. An optical lens barrel according to claim 21, wherein the object side surface of the second lens element is concave and the image side surface is concave.

25. An optical lens barrel according to claim 21, wherein the third lens element has a convex object-side surface and a convex image-side surface.

26. An optical lens barrel according to claim 21, wherein the third lens element has a convex object-side surface and a concave image-side surface.

27. An optical lens barrel according to claim 21, wherein the fourth lens element has a convex object-side surface and a convex image-side surface.

28. An optical lens barrel according to claim 21, wherein the fifth lens element has a concave object-side surface and a convex image-side surface.

29. An optical lens barrel according to claim 21, wherein the fifth lens element has a concave object-side surface and a concave image-side surface.

30. An optical lens barrel according to claim 21, wherein the sixth lens element has a convex object-side surface and a concave image-side surface.

31. An optical lens according to claim 21, wherein the second lens and the third lens are cemented to form a cemented lens.

32. An optical lens as recited in claim 21, wherein the sixth lens has a positive optical power.

33. An optical lens as recited in claim 21, wherein the sixth lens has a negative optical power.

34. An optical lens according to claim 21, characterized in that the sixth lens is an aspherical lens.

35. An optical lens element according to any one of claims 21 to 34, wherein a distance BFL from an image-side surface of the sixth lens element to an image plane of the optical lens element and a distance TL from an object-side surface of the first lens element to an image-side surface of the sixth lens element satisfy:

BFL/TL≥0.2。

36. an optical lens element according to any of claims 21-34, wherein the maximum field angle FOV of the optical lens element, the maximum clear aperture D of the object-side surface of the first lens element corresponding to the maximum field angle, and the image height H corresponding to the maximum field angle satisfy:

D/H/FOV×180°≤6.3。

37. an optical lens element according to any one of claims 21-34, characterized in that the effective focal length F3 of the third lens element and the total effective focal length F of the optical lens element satisfy:

F3/F≤4。

38. an optical lens element according to any of claims 21-34, characterized in that the combined focal length F45 of the fourth and fifth lens elements and the total effective focal length F of the optical lens element satisfy:

F45/F≤5。

39. an optical lens element according to any one of claims 21 to 34, wherein a distance d56 between the fifth and sixth lens elements on the optical axis and a total length TTL of the optical lens element satisfy:

0.01≤d56/TTL≤0.2。

40. an optical lens element according to any one of claims 21 to 34, wherein a center thickness T6 of the sixth lens element on the optical axis and a total length TTL of the optical lens element satisfy:

T6/TTL≥0.09。

41. an optical lens barrel according to any one of claims 21 to 34, wherein the central radius of curvature R31 of the object side surface of the third lens and the central radius of curvature R32 of the image side surface of the third lens satisfy:

0.2≤|R31|/|R32|≤1.2。

42. an optical lens element according to any one of claims 21 to 34, wherein the central radius of curvature R32 of the image side surface of the third lens element and the central radius of curvature R41 of the object side surface of the fourth lens element satisfy:

|(|R32|-|R41|)/(|R32|+|R41|)|≤0.5。

43. an electronic apparatus comprising the optical lens of claim 1 or 21 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.