CN112255760A

CN112255760A - Optical lens and electronic device

Info

Publication number: CN112255760A
Application number: CN201910661740.2A
Authority: CN
Inventors: 王东方; 孙毅
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2021-01-22
Anticipated expiration: 2039-07-22
Also published as: CN112255760B

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 image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; and the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface. The optical lens can realize at least one of the advantages of high resolution, miniaturization, low cost, large view field angle 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. Especially, the vehicle-mounted side-view or all-around lens plays an important role in an intelligent driving system. Due to the consideration of safety, the optical lens for vehicle-mounted application has more strict requirements on optical parameters in some aspects, and especially has higher and higher requirements on the resolving power performance of the optical lens. Meanwhile, the demand for miniaturization of the lens is increasing in the market. Therefore, there is a need for an optical lens that combines 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 image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; and the sixth lens has negative focal power, and the object side surface of the sixth lens is a concave surface and the image side surface of the sixth lens is a convex surface.

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

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

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

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

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

In one embodiment, at least one of the second lens, the third lens, the fifth lens, and the sixth lens is an aspherical lens.

The refractive index Nd1 of the first lens satisfies: nd1 is more than or equal to 1.65.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical lens on an optical axis and a total effective focal length F of the optical lens satisfy: TTL/F is less than or equal to 8.5.

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

In one 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 is less than or equal to 0.025.

In one embodiment, a radius of curvature R31 of an object-side surface of the third lens, a radius of curvature R32 of an image-side surface of the third lens, and a center thickness T3 of the third lens on the optical axis satisfy: i R31I/(IR 32I + T3) is less than or equal to 4.

In one embodiment, a radius of curvature R41 of an object-side surface of the fourth lens, a radius of curvature R42 of an image-side surface of the fourth lens, and a center thickness T4 of the fourth lens on the optical axis satisfy: i R42I/(IR 41I + T4) is less than or equal to 1.

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 more than or equal to 1.5.

In one embodiment, a distance d12 between the image side surface of the first lens and the object side surface of the second lens on the optical axis and a distance TTL between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis satisfy: d12/TTL is more than or equal to 0.08.

In one embodiment, the distance d45 between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis and the total effective focal length F of the optical lens satisfy: d45/F is less than or equal to 0.15.

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 is less than or equal to 85.

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: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that: the first lens has negative focal power; the second lens has negative focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has positive focal power; and the sixth lens has a negative power, wherein: the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens meet the following requirements: TTL/F is less than or equal to 8.5.

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

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

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

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

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

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

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

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, small distortion, low cost, large view field angle 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.

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 optical power and the surface type configuration of the first lens are beneficial to collecting incident rays with a large field angle, and ensure that as much rays as possible enter the optical system, so that the luminous flux is increased, and the illumination 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 a negative power, and can have a convex or concave object-side surface and a concave image-side surface. According to the second lens of the embodiment of the application, the light rays can be diffused, the light rays are stably transited to the rear optical system, and meanwhile, the large-angle light rays enter the optical system as much as possible, so that the system illumination is improved.

The third lens element can have a positive optical power, and both the object-side surface and the image-side surface can be convex. The focal power of the third lens is positive, and spherical aberration introduced by the first two lenses can be compensated. The second lens and the third lens cooperate with each other, wherein the lens having a negative power is in front and the lens having a positive power is in back. The third lens according to the embodiment of the present application can converge the light rays diverging from the front and transition them to the rear optical system. Such a configuration may be advantageous for reducing the rear optical path, achieving a shorter overall system length, and meeting the requirements of system miniaturization, large field angle, and small distortion.

The fourth lens element can have a positive power, and can have a concave object-side surface and a convex image-side surface. It can further converge the light in the front optical system to shorten the total length of the optical system. The fourth lens and the third lens are matched and arranged, so that miniaturization, large field angle and small distortion of the system are realized.

The fifth lens element can have a positive power, and can have a convex or concave object-side surface and a convex image-side surface. The sixth lens element has negative power, and has a concave object-side surface and a convex image-side surface. The fifth lens with positive focal power is arranged in front of the sixth lens with negative focal power, so that the light rays passing through the fourth lens are smoothly transited to the sixth lens, and the total length of the optical system is reduced.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between the third lens and the fourth lens or between the fourth lens and the fifth lens to further improve the imaging quality of the optical lens. The diaphragm is 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 near an image side surface of the third lens or an object side surface of the fifth 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 fifth lens and the sixth lens are cemented to form a cemented lens. The fifth lens with positive focal power and the sixth lens with negative focal power in the cemented lens are combined, so that the self chromatic aberration can be reduced, the tolerance sensitivity can be reduced, and the whole chromatic aberration of the system can be balanced through the residual partial chromatic aberration. 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.

In an exemplary embodiment, the first to sixth lenses in the optical lens may each be made of glass. The optical lens made of glass can further reduce the front port diameter of the optical system and improve the stability of the system.

In an exemplary embodiment, the first lens is made of a high refractive index material. For example, the refractive index Nd1 of the first lens satisfies: nd1 is more than or equal to 1.65. For another example, the first lens is preferably made of a material having a refractive index Nd1 ≧ 1.7. This choice of material for the first lens is beneficial for reducing the front aperture of the optical system, reducing the angle of incidence of the incident light rays on the face, and facilitating more light rays entering the optical system to increase the luminous flux.

In an exemplary embodiment, a distance TTL on an optical axis from an object side surface of the first lens to an imaging surface of the optical lens and a total effective focal length F of the optical lens satisfy: TTL/F is less than or equal to 8.5. Preferably, TTL/F is ≦ 8.0. 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, and the system miniaturization is favorably realized.

In an exemplary embodiment, a distance BFL on the optical axis from the image-side surface of the sixth lens to the imaging surface of the optical lens and a distance TL on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens satisfy: BFL/TL is more than or equal to 0.2. Preferably, BFL/TL is greater than or equal to 0.3. In the present application, the distance on the optical axis from the image-side surface of the sixth lens element to the imaging surface of the optical lens is also referred to as the back focal length of the optical lens; the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens is also referred to as the lens group length of the optical lens. 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 a miniaturized module is facilitated. 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.

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 is less than or equal to 0.025. Preferably, D/H/FOV is ≦ 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, a radius of curvature R31 of an object-side surface of the third lens, a radius of curvature R32 of an image-side surface of the third lens, and a center thickness T3 of the third lens on the optical axis satisfy: i R31I/(IR 32I + T3) is less than or equal to 4. Preferably, | R31|/(| R32| + T3) ≦ 3.6. The shape of the third lens is reasonably set, so that the requirement of small distortion is met while the optical system is miniaturized.

In an exemplary embodiment, a radius of curvature R41 of an object-side surface of the fourth lens, a radius of curvature R42 of an image-side surface of the fourth lens, and a center thickness T4 of the fourth lens on the optical axis satisfy: i R42I/(IR 41I + T4) is less than or equal to 1. Preferably, | R42|/(| R41| + T4) ≦ 0.6. The shape of the fourth lens is reasonably set, so that the requirement of small distortion is met while the optical system is miniaturized.

In an exemplary 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 more than or equal to 1.5. Preferably, F3/F.gtoreq.2. The focal length of the third lens is reasonably prolonged, more light rays can be ensured to enter a rear optical system, and the illumination of the system is improved.

In an exemplary embodiment, a distance d12 between the image side surface of the first lens and the object side surface of the second lens on the optical axis and a distance TTL between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis satisfy: d12/TTL is more than or equal to 0.08. Preferably, d12/TTL is ≧ 0.1. In this application, the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis may also be referred to as an air space between the first lens and the second lens. The air interval between the first lens and the second lens is reasonably increased, so that the light is smoothly transited, and the imaging quality is improved.

In an exemplary embodiment, a distance d45 between the image-side surface of the fourth lens and the object-side surface of the fifth lens on the optical axis and a total effective focal length F of the optical lens satisfy: d45/F is less than or equal to 0.15. Preferably, d45/F is ≦ 0.1. The lens space between the fourth lens and the fifth lens is reasonably reduced, more light rays can pass through the fifth lens, and the system brightness is improved.

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 is less than or equal to 85. Preferably, (FOV F)/H ≦ 82. The mutual relation of the three is reasonably set, so that the optical system has the characteristic of small distortion.

In an exemplary embodiment, each of the first to sixth lenses may be an aspherical lens, and preferably, at least one lens of the second, third, fifth, and sixth lenses may be 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 aspheric lens helps to correct system aberration and improve resolving power.

According to the optical lens of the above embodiment of the application, the shape of the lens is optimally set, the optical power is reasonably distributed, high-definition imaging can be realized by using a six-piece structure, and the requirements of miniaturization, small distortion, high resolution, low cost, large view field angle and the like of the lens can be considered. The vehicle-mounted side-view or all-around-view lens meets the application requirements of miniaturization and high resolution.

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 S5 and a convex image-side surface S6. The fourth lens L4 is a meniscus lens with positive power, with the object side S7 being concave and the image side S8 being convex. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a meniscus lens with negative power, and has a concave object-side surface S10 and a convex image-side surface S11. 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 fourth lens L4 and the fifth lens L5 to improve image quality. For example, the stop STO may be disposed near the object side S9 of the fifth lens L5.

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

Optionally, the optical lens may further include a filter L7 having an object side S12 and an image side S13, and the filter L7 may be used to correct color deviation. Meanwhile, the optical lens may further include a protective glass L8 having an object side S14 and an image side S15, and the protective glass L8 may be used to protect the image sensing chip IMA located at the image plane S16. The light from the object sequentially passes through the respective surfaces S1 to S15 and is finally imaged on the imaging surface S16.

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 S3, S4, S5, S6, S9, S10, and S11 which can be used in example 1.

Flour mark

K

A

B

C

D

E

S3

-1.4953

4.0679E-03

-8.4391E-04

7.5434E-05

-6.0300E-07

-1.2899E-07

S4

100.0000

1.4409E-02

-6.5914E-05

-2.5135E-04

-1.9230E-05

5.1068E-06

S5

100.0000

1.3746E-02

1.2624E-03

-1.2469E-04

-2.2233E-05

1.4964E-06

S6

-5.7893

1.0615E-02

1.5239E-03

3.9628E-05

1.0949E-04

-2.0801E-05

S9

-100.0000

6.6491E-03

5.1540E-06

-1.7324E-06

-4.9652E-06

1.4731E-06

S10

-0.4917

-9.6621E-03

2.3276E-03

4.8049E-04

-2.6660E-05

-1.0286E-05

S11

1.1223

3.9952E-03

3.9963E-04

4.9492E-05

-6.1284E-06

6.1296E-07

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

Table 4 below gives the conic coefficients K and higher-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S9, S10, and S11 in example 2.

Flour mark

K

A

B

C

D

E

S3

-1.4138

4.0036E-03

-8.3757E-04

7.6376E-05

-5.9005E-07

-1.2899E-07

S4

108.5786

1.4697E-02

-5.4945E-05

-2.5069E-04

-1.9085E-05

5.1068E-06

S5

101.6590

1.3891E-02

1.2904E-03

-1.2104E-04

-2.1112E-05

1.4964E-06

S6

-5.7893

1.0360E-02

1.4910E-03

6.7336E-05

1.1681E-04

-2.0801E-05

S9

2992.4280

6.8001E-03

1.4203E-04

3.8440E-05

-4.4386E-06

1.4731E-06

S10

-0.1316

-1.5478E-02

2.5202E-03

5.8295E-04

-1.4626E-04

-1.0286E-05

S11

1.1223

3.6026E-03

3.7134E-04

4.9470E-05

-6.5042E-06

6.1296E-07

TABLE 4

Example 3

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

As shown in fig. 3, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, 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 S5 and a convex image-side surface S6. The fourth lens L4 is a meniscus lens with positive power, with the object side S7 being concave and the image side S8 being convex. The fifth lens L5 is a meniscus lens with positive power, with the object side S9 being concave and the image side S10 being convex. The sixth lens L6 is a meniscus lens with negative power, and has a concave object-side surface S10 and a convex image-side surface S11. 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

Table 6 below gives the conic coefficients K and higher-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S9, S10, and S11 in example 3.

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

Table 8 below gives the conic coefficients K and higher-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S9, S10, and S11 in example 4.

Flour mark

K

A

B

C

D

E

S3

-2.2891

6.7939E-03

-1.1124E-03

6.9428E-05

-1.3387E-06

7.4668E-09

S4

-180.9225

1.7935E-02

-7.9165E-04

-2.7675E-04

-8.3964E-06

5.1068E-06

S5

0.9742

1.0961E-02

1.0946E-03

-1.0459E-04

6.9629E-06

1.4964E-06

S6

-11.4275

1.1140E-02

3.2106E-03

-3.1294E-04

2.4475E-04

-2.0801E-05

S9

-100.0000

-1.1326E-02

4.9519E-03

-1.2040E-03

1.9741E-04

1.4731E-06

S10

-0.6563

1.2085E-02

5.1213E-03

-1.7719E-03

6.3231E-04

-1.0286E-05

S11

-0.2999

3.0758E-03

1.0812E-04

2.2536E-05

-3.0528E-06

6.1296E-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 convex and the image side S4 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 L4 is a meniscus lens with positive power, with the object side S7 being concave and the image side S8 being convex. The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens L6 is a meniscus lens with negative power, and has a concave object-side surface S10 and a convex image-side surface S11. 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 third lens L3 and the fourth lens L4 to improve image quality. For example, the stop STO may be disposed near the image side surface S6 of the third lens L3.

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

Table 10 below gives the conic coefficients K and higher-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S9, S10, and S11 in example 5.

Flour mark

K

A

B

C

D

E

S3

-6.1509

-5.8900E-06

-4.5398E-06

-1.3855E-07

-3.9992E-08

-1.1916E-08

S4

0.2973

7.0280E-05

-1.4338E-05

-3.4263E-06

-3.0560E-07

2.8741E-08

S5

-0.2718

1.7880E-05

3.0774E-06

5.8438E-07

4.6702E-08

-2.7507E-08

S6

0.6754

-3.5207E-07

8.2547E-06

-2.0021E-38

3.4171E-08

1.1169E-07

S9

-3.0266

1.5843E-281

1.7137E-260

2.0745E-317

5.2487E-07

4.2832E-08

S10

-0.4832

-1.5906E-04

-3.4455E-05

1.3523E-06

-9.9411E-07

-5.5317E-07

S11

-7.3551

-9.1413E-06

-4.3673E-06

-5.9063E-07

2.9363E-08

2.7658E-08

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

Table 12 below gives the conic coefficients K and higher-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S9, S10, and S11 in example 4.

Flour mark

K

A

B

C

D

E

S3

-6.1509

-5.8900E-06

-4.5398E-06

-1.3855E-07

-3.9992E-08

-1.1916E-08

S4

0.2973

7.0280E-05

-1.4338E-05

-3.4263E-06

-3.0560E-07

2.8741E-08

S5

-0.2718

1.7880E-05

3.0774E-06

5.8438E-07

4.6702E-08

-2.7507E-08

S6

0.6754

-3.5207E-07

8.2547E-06

-2.0021E-38

3.4171E-08

1.1169E-07

S9

-3.0266

1.5843E-281

1.7137E-260

2.0745E-317

5.2487E-07

4.2832E-08

S10

-0.4832

-1.5906E-04

-3.4455E-05

1.3523E-06

-9.9411E-07

-5.5317E-07

S11

-7.3551

-9.1413E-06

-4.3673E-06

-5.9063E-07

2.9363E-08

2.7658E-08

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, R42, D12, D45, F3, T3, T4 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 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 negative focal power, and the image side surface of the second lens is a concave surface;

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

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

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

the sixth lens element has a negative focal power, and has a concave object-side surface and a convex image-side surface.

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

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

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

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

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

7. An optical lens according to claim 1, wherein at least one of the second lens, the third lens, the fifth lens, and the sixth lens is an aspherical lens.

8. An optical lens according to any one of claims 1 to 7, characterized in that the refractive index Nd1 of the first lens satisfies:

Nd1≥1.65。

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 a negative optical power;

the third lens has positive optical power;

the fourth lens has positive optical power;

the fifth lens has positive focal power; and

the sixth lens has a negative power, wherein:

the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens meet the following requirements:

TTL/F≤8.5。

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.