CN112835180A

CN112835180A - Optical lens

Info

Publication number: CN112835180A
Application number: CN202110074518.XA
Authority: CN
Inventors: 王东方; 李慧敏
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2017-12-18
Filing date: 2017-12-18
Publication date: 2021-05-25
Also published as: CN109932807B; CN109932807A

Abstract

The present application discloses an optical lens, which sequentially comprises, from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens can have negative focal power, and both the object side surface and the image side surface of the first lens can be concave; the second lens can have positive focal power, and the object side surface of the second lens can be a concave surface, and the image side surface of the second lens can be a convex surface; the third lens and the fourth lens can have positive focal power, and both the object side surface and the image side surface of the third lens can be convex surfaces; the fifth lens may have a negative optical power; and the sixth lens element can have positive optical power, and its side surface can be convex surface, and its image side surface can be concave surface. According to the optical lens, the effects of large aperture, large field angle, high resolution and the like can be realized.

Description

Optical lens

Technical Field

The present application relates to an optical lens, and more particularly, to an optical lens including six lenses.

Background

With the continuous popularization and development of automatic/auxiliary driving systems, the performance requirements of the vehicle-mounted lens as an important component part of the vehicle-mounted lens are increasingly improved, and the requirements are mainly reflected in the following aspects:

1. the requirement for the resolution of the vehicle-mounted lens is higher and higher, and especially for the front-view lens, the popularization is continuously promoted from the original megapixels to the direction of 2M at present, and even higher resolution of 4M and 8M is pursued;

2. meanwhile, in order to detect a front distant-range orientation object, a conventional front-view lens is limited in field angle and small in field angle (namely, the front-view lens is far away and has a long focal length, so that the field angle visible range is small), and therefore, the visual range is expanded to meet further requirements and trends, and the front-view lens is also a challenge.

3. With the improvement of the resolution and the increase of the angle of view, the volume of the lens is inevitably increased, so that the miniaturization is ensured as much as possible, which is still important.

Therefore, it is necessary to design an optical lens that is compatible with the functions of a telephoto lens and a short-focus lens, and has a large aperture, a large field angle, and a high resolution, so as to replace the conventional single-function multi-lens in the driving system.

Disclosure of Invention

The present application provides an optical lens that is adaptable for on-board installation and that overcomes, at least in part, at least one of the above-identified deficiencies in the prior art.

An aspect of the present application provides an optical lens that may include, in order from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens can have negative focal power, and both the object side surface and the image side surface of the first lens can be concave; the second lens can have positive focal power, and the object side surface of the second lens can be a concave surface, and the image side surface of the second lens can be a convex surface; the third lens and the fourth lens can have positive focal power, and both the object side surface and the image side surface of the third lens can be convex surfaces; the fifth lens may have a negative optical power; and the sixth lens element can have positive optical power, and its side surface can be convex surface, and its image side surface can be concave surface.

In one embodiment, the fourth lens may be cemented with the fifth lens

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

In another embodiment, both the object-side surface and the image-side surface of the fifth lens can be concave.

In one embodiment, the first lens may be an aspheric lens.

In one embodiment, the sixth lens may be an aspheric lens.

In one embodiment, one or more of the first through sixth lenses may be a glass lens. Further, the first lens and the sixth lens may be glass aspherical lenses.

In one embodiment, a distance TTL between a center of an object side surface of the first lens element and an imaging surface of the optical lens on an optical axis and a full-group focal length value F of the optical lens may satisfy: TTL/F is less than or equal to 7.5.

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 of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens may satisfy: D/h/FOV is less than or equal to 0.015.

In one embodiment, the maximum field angle FOV of the optical lens, the whole group of focal length values F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens can satisfy (FOV F)/h ≧ 63.

In one embodiment, the maximum field angle FOV of the optical lens may satisfy: the FOV is more than or equal to 100 degrees.

In one embodiment, the optical lens may further include a stop disposed between the first lens and the second lens.

Another aspect of the present application provides an optical lens that may include, in order from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Wherein the first lens and the fifth lens can have negative focal power; the second lens, the third lens, the fourth lens, and the sixth lens may have positive optical power; and the fourth lens element can be cemented with the fifth lens element, wherein the distance TTL from the center of the object-side surface of the first lens element to the image plane of the optical lens on the optical axis and the whole focal length F of the optical lens satisfy: TTL/F is less than or equal to 7.5. In one embodiment, the object-side surface of the fifth lens element can be concave and the image-side surface can be convex.

In one embodiment, the first lens may be an aspheric lens.

In one embodiment, the sixth lens may be an aspheric lens.

In one embodiment, both the object-side surface and the image-side surface of the first lens can be concave.

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

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

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

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

The six lenses are adopted, the shapes of the lenses are set optimally, the focal power of each lens is distributed reasonably, the cemented lens is formed, and the like, so that the optical lens has the advantages of large aperture, high pixel, large field angle, long integral focal length, large angular resolution in the central area 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; and

fig. 4 is a schematic view showing a structure of an optical lens according to embodiment 4 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, and the first cemented lens may also be referred to as the second cemented 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, and the surface of each lens closest to the image plane is called the image side surface.

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 power, 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 in order from the object side to the image side along the optical axis.

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 optical power, and both the object-side surface and the image-side surface thereof may be concave. The first lens can collect large-angle light rays as far as possible, so that the light rays enter the optical system, and the whole large view field range can be favorably realized. In addition, the first lens adopts a biconcave shape, so that the realization of central large-angle resolution (the angular resolution refers to the capability of an imaging system to distinguish the minimum distance between two adjacent objects differently) can be facilitated, the identification degree of an environmental object is improved, and the detection area of the central part is increased in a targeted manner; and the biconcave shape can make peripheral light have the optical path difference with central light to divergent central light and get into rear optical system, reduce the camera lens front end bore, reduce the volume, be favorable to realizing miniaturization and cost reduction.

The second lens element can have a positive power, and can have a concave object-side surface and a convex image-side surface. The second lens is a meniscus positive lens, so that front-end light can be smoothly transited to a rear optical system, and the reduction of the rear port diameter is facilitated.

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 third lens is a double-convex positive lens and can quickly converge the front large-angle light to the rear optical system.

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

The sixth lens element can have a positive optical power, and can have a convex object-side surface and a concave image-side surface. The arrangement of the sixth lens can further trim aberration, distortion and ray convergence, and reduce the principal ray angle CRA. Alternatively, the sixth lens may be made of a material having a high refractive index.

In an exemplary embodiment, a diaphragm for limiting the light beam may be disposed between, for example, the first lens and the second lens to further improve the imaging quality of the lens. When the diaphragm is arranged between the first lens and the second lens, the aperture of the lens at the front end of the lens can be effectively reduced, and the realization of large aperture is facilitated.

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 fourth lens and the fifth lens may be combined into a cemented lens by cementing the image-side surface of the fourth lens with the object-side surface of the fifth lens. By introducing the cemented lens consisting of the fourth lens and the fifth lens, the chromatic aberration influence can be eliminated, the field curvature is reduced, and the coma is corrected; meanwhile, the cemented lens may also retain a part of chromatic aberration to balance the entire chromatic aberration of the optical system. The air space between the two lenses is omitted by gluing the lenses, so that the optical system is compact as a whole, and the requirement of system miniaturization is met. Furthermore, the gluing of the lenses reduces tolerance sensitivity problems of the lens units due to tilt/decentration during assembly.

In the cemented lens, the fourth lens close to the object side has positive focal power, and the fifth lens close to the image side has negative focal power, so that the arrangement is favorable for further converging light rays passing through the front diaphragm and reducing the total TTL.

In an exemplary embodiment, TTL/F ≦ 7.5 may be satisfied between the total optical length TTL of the optical lens and the entire set of focal length values F of the optical lens, and more particularly, TTL and F may further satisfy 6.2 ≦ TTL/F ≦ 7.41. The condition TTL/F is less than or equal to 7.5, and the miniaturization characteristic of the lens can be realized.

In an exemplary embodiment, D/h/FOV ≦ 0.015, more specifically, 0.007 ≦ D/h/FOV ≦ 0.012 may be satisfied between 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 of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens. The conditional expression D/h/FOV is less than or equal to 0.015, and the small aperture of the front end of the lens can be realized.

In an exemplary embodiment, (FOV xF)/h ≧ 63, more specifically, 63 ≦ FOV xF)/h ≦ 72.1 may be further satisfied between the maximum field angle FOV of the optical lens, the entire set of focal length values F of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens. The condition (FOV multiplied by F)/h is more than or equal to 63, and the requirements of long focus and large field angle of the lens can be met at the same time.

In an exemplary embodiment, the maximum field angle FOV of the optical lens may satisfy: the FOV is more than or equal to 100 degrees so as to meet the requirement of large field angle of the lens.

In an exemplary embodiment, the lens used in the optical lens may be a plastic lens, or may be a glass lens. Because the thermal expansion coefficient of the lens made of plastic is large, when the ambient temperature change of the lens is large, the lens made of plastic has a large influence on the overall performance of the lens. And the glass lens can reduce the influence of temperature on the performance of the lens. Ideally, the first lens to the sixth lens of the optical lens of the present invention can all adopt glass lenses, so as to reduce the influence of the environment on the whole system, meet the application requirements of the forward-looking lens, and improve the overall performance of the optical lens.

In an exemplary embodiment, the first lens and the sixth lens may be arranged as aspherical mirror plates. Alternatively, one or both of the second lens and the third lens may also be arranged as an aspherical mirror. The aspheric lens has the characteristics that: the curvature varies continuously from the center of the lens to the periphery. 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 the 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. Further, the first lens can be configured to be a glass aspheric lens, so that the resolution is improved, and the front end aperture is further reduced. Further, the sixth lens may be configured as a glass aspheric lens, thereby improving resolution.

The optical lens according to the above-described embodiment of the present application has many advantages. The lens realizes multifunctional combination in performance: the lens has a small central angle (a small field angle range is arranged at a position close to the center), namely, the long-focus function characteristic of the traditional front-view lens is realized, and the details such as license plates, traffic signals and the like can be conveniently recognized under the condition of keeping a certain object distance; the whole lens has the characteristics of a total angle of more than 120 degrees, namely a short-focus lens with a large field angle, has the functions of a traditional wide-angle lens, is convenient for confirming surrounding objects, performing anti-collision early warning and knowing the surrounding road conditions nearby; the single lens is compatible with the functions of the long-focus lens and the short-focus lens, can replace a plurality of lenses with traditional single functions in a driving system, and achieves the effect of expanding the visual range of the front-view lens, thereby greatly reducing the overall cost of the driving system and effectively increasing the actual usability of the lenses. In addition, the optical lens adopts a glass non-spherical lens partially through reasonable lens shape design and material collocation, so that the high resolution definition can be realized, and the resolution can reach 8M; the optical lens has a small front end diameter, and a conventional lens structure with similar performance is large in diameter, but the diameter of the front end of the structure is greatly reduced. Furthermore, the optical lens has the optical characteristics of large aperture, high resolution, large field of view (FOV is more than 100 degrees), long overall focal length and large angular resolution in the central area, and can better meet the requirements of the vehicle-mounted lens.

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 including 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

The first lens L1 is a biconcave lens with negative power, and has a concave object-side surface S1 and a concave image-side surface S2.

The second lens L2 is a meniscus lens with positive power, with the object side S4 being concave and the image side S5 being convex.

The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7.

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. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

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.

Optionally, the optical lens may further include a filter L7 having an object-side surface S13 and an image-side surface S14, and a protective lens L8 having an object-side surface S15 and an image-side surface S16. Filter L7 can be used to correct for color deviations. The protective lens L8 may be used to protect the image sensing chip on the imaging plane IMA. Light from the object passes through each of the surfaces S1 to S16 in sequence and is finally imaged on the imaging plane IMA.

In the optical lens of the present embodiment, a stop STO may be provided between the first lens L1 and the second lens L2 to improve the imaging quality.

Table 1 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1, where the radius of curvature R and the thickness T are both in units of millimeters (mm).

TABLE 1

In the embodiment, six lenses are taken as an example, and by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens and the air space between the lenses, a single lens can have the characteristics of a long-focus lens and a short-focus lens at the same time, and the effects of long overall focal length, small central angle, small front-end aperture, large overall field angle and high pixel are achieved. 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 high-order term coefficients A, B, C, D and E of the aspherical lens surfaces S1, S2, S4, S5, S11 and S12 that can be used in example 1.

TABLE 2

Flour mark

K

A

B

C

D

E

1

-27.3954

5.2638E-03

-9.5330E-04

9.4202E-05

-3.7504E-06

0.0000E+00

2

1.4406

4.3710E-02

-1.6112E-02

5.9024E-03

-1.2637E-03

1.2386E-04

4

-1360.0610

-7.1486E-03

2.3249E-03

-1.3406E-03

4.2128E-04

-4.6700E-05

5

0.7367

-9.7264E-04

-5.2667E-05

1.0917E-06

-6.4121E-07

4.2532E-07

11

0.6438

-2.6112E-03

-4.7844E-05

-8.3674E-06

4.7371E-07

-1.0422E-08

12

-2.5182

-3.1776E-03

-2.0843E-04

-1.0617E-05

2.4039E-06

-8.1760E-07

Table 3 below gives the total optical length TTL of the optical lens of example 1 (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S17), the entire group focal length value F of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens.

TABLE 3

TTL(mm)	20.035	h(mm)	3.862
				F(mm)	2.707	FOV(°)	100
D(mm)	4.456

In the present embodiment, TTL/F is 7.401 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens satisfy D/h/FOV of 0.012; and the maximum field angle FOV of the optical lens, the whole group focal length value F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy (FOV multiplied by F)/h as 70.094.

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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

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. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

Optionally, the optical lens may further include a filter L7 and/or a protective lens L7' having an object side S13 and an image side S14. Filter L7 can be used to correct for color deviations. The protective lens L7' may be used to protect the image sensing chip on the imaging plane IMA. Light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging plane IMA.

Table 4 below shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 2, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 5 below shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S4, S5, S6, S7, S11 and S12 in example 2. Table 6 below gives the total optical length TTL of the optical lens of example 2 (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S15), the entire group focal length value F of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens.

TABLE 4

TABLE 5

Flour mark

K

A

B

C

D

E

4

-300.0000

-4.1098E-05

7.0628E-05

-1.5246E-05

2.0619E-06

-8.9561E-08

5

-0.0359

1.3291E-04

1.0158E-05

7.0731E-09

-4.0108E-09

1.1453E-09

6

-0.9368

-1.1189E-04

2.8984E-05

-1.3057E-07

4.4522E-09

1.4818E-11

7

-0.3038

-4.9722E-04

1.6552E-05

-2.8551E-07

1.8185E-09

2.3554E-10

11

-2.2393

-1.3413E-03

4.8863E-06

-1.1513E-07

7.6804E-09

2.2090E-10

12

-3.3255

-2.0719E-03

-2.9586E-05

1.5876E-06

-3.2333E-09

-3.0819E-10

TABLE 6

TTL(mm)	18.721	h(mm)	4.988
				F(mm)	2.995	FOV(°)	120
D(mm)	5.464

In the present embodiment, TTL/F is 6.250, which is satisfied between the total optical length TTL of the optical lens and the entire focal length F of the optical lens; the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens satisfy D/h/FOV of 0.009; and the maximum field angle FOV of the optical lens, the whole group focal length value F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy (FOV multiplied by F)/h as 72.061.

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. 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. 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

Table 7 below shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 3, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 8 below shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S4, S5, S11 and S12 in example 3. Table 9 below gives the total optical length TTL of the optical lens of example 3 (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S15), the entire group focal length value F of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens.

TABLE 7

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	-8.7243	0.5402	1.59	61.16
2	3.1951	1.3603
					STO	All-round	0.1234
4	-24.5014	4.0000	1.59	61.16
					5	-5.2257	1.7380
6	11.9616	3.8000	1.50	81.59
					7	-6.2958	0.0600
8	5.8791	3.9479	1.50	81.59
					9	-5.4714	0.5000	1.92	18.90
10	60.4208	0.0600
					11	5.7019	2.2807	1.81	41.00
12	6.8366	0.4384
					13	All-round	0.3301	1.52	64.21
14	All-round	0.5006
					IMA	All-round

TABLE 8

Flour mark

K

A

B

C

D

E

1

-28.0000

4.8816E-03

-4.4709E-04

8.5455E-06

1.5773E-06

-1.1764E-07

2

1.7201

7.1472E-03

-3.8756E-04

5.5632E-04

-2.1013E-04

3.1346E-05

4

-125.7031

-2.8816E-03

1.9764E-03

-6.0283E-04

4.3935E-04

-6.6464E-05

5

-0.1542

-7.8248E-04

-3.1411E-05

2.9556E-05

-6.6872E-06

5.3132E-07

11

0.1808

-2.2732E-03

1.1080E-04

-3.1016E-05

3.0672E-06

-1.7262E-07

12

-8.3922

-9.8024E-04

-1.8416E-04

1.4685E-05

-5.5982E-06

3.2169E-07

TABLE 9

TTL(mm)	19.680	h(mm)	4.556
				F(mm)	2.669	FOV(°)	120
D(mm)	4.387

In the present embodiment, TTL/F is 7.372 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the maximum field angle FOV of the optical lens, the maximum light-passing aperture D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy that D/h/FOV is 0.008; and the maximum field angle FOV of the optical lens, the whole group focal length value F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy (FOV multiplied by F)/h as 70.309.

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. 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. 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 the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

Table 10 below shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 4, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 11 below shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S1, S2, S4, S5, S11 and S12 in example 4. Table 12 below gives the total optical length TTL of the optical lens of example 4 (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S17), the entire group focal length value F of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens.

Watch 10

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	-7.7382	0.6000	1.59	61.16
2	3.3940	1.7254
					STO	All-round	0.0373
4	-33.9530	3.1935	1.59	61.16
					5	-5.4902	2.8167
6	11.9231	3.0414	1.50	81.59
					7	-7.1078	0.0608
8	6.3449	3.6497	1.50	81.59
					9	-6.3449	0.4136	1.92	20.90
10	54.8377	0.0608
					11	6.3757	2.1149	1.81	41.00
12	8.8338	0.8212
					13	All-round	0.5500	1.52	64.21
14	All-round	0.5000
					15	All-round	0.4000	1.52	64.21
16	All-round	0.3624
					IMA	All-round

TABLE 11

Flour mark

K

A

B

C

D

E

1

-28.7867

5.0420E-03

-6.1186E-04

3.0242E-05

5.7253E-07

-1.0154E-07

2

1.2894

9.6490E-03

-1.0812E-03

7.0061E-04

-2.5342E-04

3.5247E-05

4

-325.7031

-3.6678E-03

1.6157E-03

-8.8252E-04

2.8950E-04

-5.7894E-05

5

0.2121

-6.5463E-04

-6.3183E-04

2.3681E-05

-5.9284E-07

8.4257E-08

11

-0.1353

-1.8074E-03

5.7837E-05

-2.5091E-05

1.5543E-06

-1.6577E-07

12

-4.3914

-1.8765E-03

-1.6285E-04

2.2426E-05

-5.5777E-06

2.8919E-07

TABLE 12

TTL(mm)	20.348	h(mm)	6.226
				F(mm)	3.054	FOV(°)	130
D(mm)	5.271

In the present embodiment, TTL/F is 6.662 which is satisfied between the total optical length TTL of the optical lens and the entire focal length F of the optical lens; the maximum field angle FOV of the optical lens, the maximum light-transmitting caliber D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy that D/h/FOV is 0.007; and the maximum field angle FOV of the optical lens, the whole group focal length value F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy (FOV multiplied by F)/h as 63.771.

In summary, examples 1 to 4 each satisfy the relationship shown in table 13 below.

Watch 13

Conditions/examples	1	2	3	4
					TTL/F	7.401	6.250	7.372	6.662
D/h/FOV	0.012	0.009	0.008	0.007
					(FOV×F)/h	70.094	72.061	70.309	63.771

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens,

it is characterized in that the preparation method is characterized in that,

the first lens has negative focal power, and both the object side surface and the image side surface of the first lens are concave;

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

the third lens has positive focal power, and both the object side surface and the image side surface of the third lens are convex surfaces;

the fourth lens is glued with the fifth lens; and

the sixth lens has positive 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 maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens satisfy: D/h/FOV is less than or equal to 0.015.

2. An optical lens as recited in claim 1, wherein the fourth lens element has a positive optical power, and wherein both the object-side surface and the image-side surface are convex.

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

4. An optical lens barrel according to claim 1, wherein the fifth lens element has a negative power and both the object-side surface and the image-side surface are concave.

5. An optical lens according to claim 1, characterized in that the first lens is an aspherical mirror.

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

7. An optical lens barrel according to any one of claims 1 to 6, wherein a distance TTL between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis and a full group focal length value F of the optical lens satisfy: TTL/F is less than or equal to 7.5.

8. The optical lens according to any one of claims 1 to 6, wherein (FOV x F)/h ≧ 63 is satisfied between the maximum field angle FOV of the optical lens, the entire group of focal length values F of the optical lens, and an image height h corresponding to the maximum field angle of the optical lens.

9. An optical lens according to any of claims 1-6, characterized in that the maximum field angle FOV of the optical lens satisfies: the FOV is more than or equal to 100 degrees.

10. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens,

it is characterized in that the preparation method is characterized in that,

the fourth lens is glued with the fifth lens; and

and the maximum field angle FOV of the optical lens, the whole group of focal length values F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens meet the condition that (FOV multiplied by F)/h is not less than 63.