CN110794550B

CN110794550B - Optical lens

Info

Publication number: CN110794550B
Application number: CN201810861954.XA
Authority: CN
Inventors: 徐超; 张绍鹏; 杨佳
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2022-03-29
Anticipated expiration: 2038-08-01
Also published as: CN110794550A

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. Wherein the first lens may have a positive optical power; the second lens can have negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens can have negative focal power, and both the object side surface and the image side surface of the third lens are concave; the fourth lens can have positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens can have positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces; and the sixth lens element may have a positive optical power, and both the object-side surface and the image-side surface thereof are convex. According to the optical lens, at least one of the beneficial effects of small front-end caliber, high resolution, thermal stability, small distortion, small CRA, small FNO 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

The optical lens is an important component for realizing unmanned driving. For some lens applications, it is generally desirable that the lens FNO be smaller in order to collect more light. For some specific lenses, a higher resolution is generally required for image clarity. However, in general, the smaller the FNO, the more blurred the imaging, and thus it is difficult to achieve a high resolution for a lens having a small FNO.

The application aims to provide the optical lens which can realize high resolution simultaneously besides the characteristic of ensuring the FNO to be small.

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. Wherein the first lens may have a positive optical power; the second lens can have negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens can have negative focal power, and both the object side surface and the image side surface of the third lens are concave; the fourth lens can have positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens can have positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces; and the sixth lens element may have a positive optical power, and both the object-side surface and the image-side surface thereof are convex.

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

In another embodiment, the object-side surface of the first lens element can be a flat surface, and the image-side surface can be a convex surface.

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

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

In one embodiment, the third lens and the fourth lens may be cemented to each other to form a cemented lens.

In one embodiment, the focal length value F1 of the first lens and the focal length value F of the whole group of the optical lens satisfy: F1/F is more than or equal to 8 and less than or equal to 15.

In one embodiment, a radius of curvature R9 of the object-side surface of the fifth lens and a center thickness d9 of the fifth lens may satisfy: r9/d9 is more than or equal to 4 and less than or equal to 7.5.

In one embodiment, the focal length value F3 of the third lens and the focal length value F4 of the fourth lens satisfy: F3/F4 of-1.3 is less than or equal to-0.8.

In one embodiment, the focal length value F5 of the fifth lens and the focal length value F of the whole group of the optical lens satisfy: F5/F is more than or equal to 3 and less than or equal to 6.

In one embodiment, the focal length value F2 of the second lens and the focal length value F6 of the sixth lens satisfy: F2/F6 of more than or equal to-0.9 and less than or equal to-0.4.

In one embodiment, the central thickness d3 of the second lens and the central thickness d11 of the sixth lens satisfy: d3/d11 is more than or equal to 0.1 and less than or equal to 0.3.

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 0.25.

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. The first lens, the fourth lens, the fifth lens and the sixth lens all have positive focal power; the second lens and the third lens may each have a negative optical power; the third lens may be cemented with the fourth lens; and the radius of curvature R9 of the object side surface of the fifth lens and the central thickness d9 of the fifth lens can satisfy that: r9/d9 is more than or equal to 4 and less than or equal to 7.5.

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

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

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

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

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

The optical lens adopts six lenses, the focal power of each lens is reasonably distributed and the cemented lens is formed by optimally setting the shape of the lens, so that at least one of the beneficial effects of small caliber, high resolution, thermal stability, small distortion, small CRA, small FNO and the like at the front end of the optical lens is realized.

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 element can have a positive optical power, and can optionally have a convex or planar or concave object-side surface and a convex image-side surface. The first lens should be able to collect as much light as possible in the field of view so that the light transitions smoothly into the rear optical system.

The second lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface. The second lens can disperse light to enable the light to be transited to the rear optical system.

The third lens element can have a negative optical power, and can have a concave object-side surface and a concave image-side surface. The third lens can disperse light and properly introduce negative spherical aberration.

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 fourth lens can converge the light and properly introduce positive spherical aberration.

The fifth lens element can have a positive optical power, and can have a convex object-side surface and a convex image-side surface.

The sixth lens element can have a positive optical power, and can have a convex object-side surface and a convex image-side surface. The sixth lens element can converge the light onto the image plane.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between, for example, the second lens and the third lens to further improve the imaging quality of the lens. When the diaphragm is arranged between the second lens and the third lens, the front light and the rear light can be collected, the total length of the optical system is effectively shortened, and the calibers of the front lens and the rear lens are reduced. 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 imaging surface to filter light rays having different wavelengths, as necessary; and may further include a protective glass disposed between the optical filter and the imaging surface to prevent internal elements (e.g., chips) 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 third lens and the fourth lens may be combined into a cemented lens by cementing the image-side surface of the third lens with the object-side surface of the fourth lens. By introducing the cemented lens consisting of the third lens and the fourth 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 third lens close to the object side has negative focal power, and the fourth lens close to the image side has positive focal power, so that the arrangement is favorable for further diverging the front light, rapidly converging the front light and then transferring the front light to the rear optical system, the optical path of the rear light is favorably reduced, and the short TTL is realized.

In an exemplary embodiment, a focal length value F1 of the first lens and a focal length value F of the entire group of the optical lens may satisfy: F1/F is not less than 8 and not more than 15, and more preferably, F1/F is not more than 10 and not more than 13. By reasonably distributing focal power, the focal length of the first lens meets the conditional expression that F1/F is less than or equal to 15 and the effect of smooth transition light can be realized.

In an exemplary embodiment, a focal length value F3 of the third lens and a focal length value F4 of the fourth lens may satisfy: F3/F4 of-1.3 or more is not less than-0.8, and more preferably, F3/F4 of-1.1 or more is not less than-0.9. By enabling the focal lengths of the two lenses to satisfy the conditional expression of-1.3-F3/F4-0.8, the maximum chromatic aberration correction can be realized, and the resolution of the system is improved.

In an exemplary embodiment, the fourth lens can be made of a material with a large refractive index, for example, the refractive index Nd4 ≧ 1.65 of the material of the fourth lens, so as to facilitate reduction of the air space between the fourth lens and the fifth lens, which helps achieve system miniaturization.

In an exemplary embodiment, a focal length value F5 of the fifth lens and a focal length value F of the entire group of the optical lens may satisfy: F5/F is 3. ltoreq. F5/F.ltoreq.6, and more preferably, 4. ltoreq. F5/F.ltoreq.5. By controlling the focal length of the fifth lens, the main light angle CRA of the system can be reduced, so that the vehicle-mounted CMOS chip with the small angle can be perfectly matched, and the phenomena of color cast and dark angle are not generated.

In an exemplary embodiment, a focal length value F2 of the second lens and a focal length value F6 of the sixth lens may satisfy: F2/F6 of-0.9 or less is-0.4 or less, and more preferably-0.8 or less is F2/F6 of-0.6 or less. By controlling the focal length ratio of the second lens to the sixth lens, maximum aberration correction can be achieved.

In an exemplary embodiment, a radius of curvature R9 of the object-side surface of the fifth lens and a center thickness d9 of the fifth lens may satisfy: r9/d9 is 4. ltoreq.7.5, and more preferably, R9/d9 is 5. ltoreq.7. Through the special shape design of the fifth lens, the light trend can be controlled, so that as much light as possible enters the system, and small FNO is realized.

In an exemplary embodiment, the center thickness d3 of the second lens and the center thickness d11 of the sixth lens may satisfy: d3/d11 of 0.1. ltoreq.0.3, and more preferably, d3/d11 of 0.15. ltoreq.0.25. The second lens and the sixth lens have the largest thermal difference contribution amount to the whole system, and the thermal performance of the whole system is optimal by satisfying the conditional expression that d3/d11 is more than or equal to 0.1 and less than or equal to 0.3, so that the thermal difference elimination processing of the whole system is facilitated, and clear imaging at high and low temperatures is realized.

In an exemplary embodiment, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle 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 0.25 or less, and more preferably, D/H/FOV is 0.2 or less. The condition that D/H/FOV is less than or equal to 0.25 is met, and the characteristic of small aperture at the front end of the lens can be realized.

In an exemplary embodiment, the second lens and the sixth lens in the optical lens according to the present application may employ aspherical lenses. 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. For example, the second lens may be an aspheric lens to reduce aberrations, help to improve resolving power and reduce distortion. The sixth lens can be an aspheric lens to further reduce the aberration of the whole system, improve the resolving power and reduce the distortion. Ideally, the second and sixth lenses are aspheric lenses, and such an optical arrangement helps to reduce lens tolerance sensitivity and facilitate athermal treatment. It is understood that the optical lens according to the present application may increase the number of aspherical lenses in order to improve the imaging quality.

In an exemplary embodiment, the lens used in the optical lens may be a plastic lens, or may be a glass lens. The lens made of plastic has a large thermal expansion coefficient, and when the ambient temperature change of the lens is large, the lens made of plastic causes a large amount of change of the optical back focus of the lens. The glass lens can reduce the influence of temperature on the optical back focus of the lens, but has higher cost.

According to the optical lens of the embodiment of the application, the shape of the lens is optimally set, the focal power is reasonably distributed, and the lens material is reasonably selected, so that the front end aperture can be reduced, the TTL is shortened, the miniaturization of the lens is ensured, and the characteristic of high resolution is realized; in addition, through the special shape design of the fifth lens, the light trend can be controlled, the light inflow amount is large, and therefore small FNO is achieved, and the optical lens is particularly suitable for application requirements needing large light incidence amount; two aspheric lenses are adopted by the second lens and the sixth lens, so that high resolution is realized. Therefore, the optical lens according to the above embodiment of the present application can have at least one of the advantages of high resolution, thermal stability, small front aperture, small distortion, small CRA, small FNO, and the like, and can better meet the requirements of the on-vehicle 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 plano-convex lens with positive power, and has an object-side surface S1 being a plane surface and an image-side surface S2 being a convex surface.

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 biconcave lens with negative optical power, and both the object-side surface S6 and the image-side surface S7 are concave. The fourth lens L4 is a biconvex lens with positive optical power, and has both the object-side surface S7 and the image-side surface S8 convex. Wherein, the third lens L3 and the fourth lens L4 are cemented with each other to form a cemented lens.

The fifth lens L5 is a biconvex lens with positive optical power, and has both the object-side surface S9 and the image-side surface S10 convex.

The sixth lens L6 is a biconvex lens with positive optical power, and has both the object-side surface S11 and the image-side surface S12 convex.

The second lens element L2 and the sixth lens element L6 are both aspheric lenses, and both the object-side surface and the image-side surface thereof are aspheric.

Optionally, the optical lens may further include a filter L8 and/or a protective lens L8' having an object side S13 and an image side S14. Filter L8 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. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the optical lens of the present embodiment, a stop STO may be provided between the second lens L2 and the third lens L3 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

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	All-round	2.4400	1.90	31.32
2	-54.5494	1.7000
					3	29.7895	1.1000	1.51	56.82
4	4.3727	6.7600
					STO	All-round	0.9600
6	-12.6200	1.3900	1.73	28.32
					7	37.8900	5.5100	1.75	52.34
8	-11.9110	0.1400
					9	23.6300	4.4700	1.80	46.57
10	-121.3600	4.5400
					11	14.1950	5.7300	1.53	55.58
12	-14.9700	0.5949
					13	All-round	0.7000	1.52	54.09
14	All-round	6.5001
					IMA	All-round

The present embodiment adopts six lenses as an example, and by reasonably distributing 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 small front end aperture, high resolution, thermal stability, small distortion, small CRA, small FNO 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 to S4, S11 to S12 usable in example 1.

TABLE 2

Flour mark

K

A

B

C

D

E

3

-10.2638

-2.1594E-04

1.9389E-06

-2.2558E-07

6.6061E-09

-7.0202E-11

4

-0.8280

1.1230E-04

1.4418E-04

-1.4333E-05

7.4069E-07

-1.4932E-08

11

-1.2883

-5.3836E-06

-7.1686E-07

4.1321E-08

-7.1883E-10

7.3339E-12

12

-37.8271

-5.9691E-04

2.8442E-05

-6.4972E-07

8.0038E-09

-3.4335E-11

Table 3 below gives the entire group focal length value F of the optical lens of example 1, the focal length values F1 to F6 of the first lens L1 to the sixth lens L6, the radius of curvature R9 of the object-side surface S9 of the fifth lens L5, the center thickness D9 of the fifth lens L5, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum angle of view of the optical lens, the image height FOV corresponding to the maximum angle of view of the optical lens, the center thickness D3 of the second lens L2, the center thickness D11 of the sixth lens L6, and the material refractive index Nd4 of the fourth lens L4.

TABLE 3

F(mm)	5.6978	d9(mm)	4.4700
				F1(mm)	61.9908	D(mm)	21.5226
F2(mm)	-10.1329	H(mm)	7.6280
				F3(mm)	-13.2302	FOV(°)	69.28
F4(mm)	12.8169	d3(mm)	1.1000
				F5(mm)	25.4176	d11(mm)	5.7300
F6(mm)	14.8189	Nd4	1.75
				R9(mm)	23.6300

In the present embodiment, F1/F10.880 is satisfied between the focal length value F1 of the first lens L1 and the focal length value F of the entire group of optical lenses; F3/F4 is-1.032 between the focal length value F3 of the third lens L3 and the focal length value F4 of the fourth lens L4; F5/F4.461 is satisfied between the focal length value F5 of the fifth lens L5 and the focal length value F of the entire group of optical lenses; F2/F6 is-0.684 between the focal length value F2 of the second lens L2 and the focal length value F6 of the sixth lens L6; r9/d 9-5.286 is satisfied between the radius of curvature R9 of the object-side surface S9 of the fifth lens L5 and the center thickness d9 of the fifth lens L5; d3/d11 of 0.192 is satisfied between the central thickness d3 of the second lens L2 and the central thickness d11 of the sixth lens L6; and D/H/FOV is 0.041 between 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.

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 first lens L1 is a biconvex lens with positive optical power, and has both the object-side surface S1 and the image-side surface S2 being convex.

Optionally, the optical lens may further include a filter L8 and/or a protective lens L8' having an object side S13 and an image side S14. Filter L8 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. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane L8.

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). The following table 5 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 S3 to S4, S11 to S12 in example 2. Table 6 below gives the entire group focal length value F of the optical lens of example 2, the focal length values F1 to F6 of the first lens L1 to the sixth lens L6, the radius of curvature R9 of the object-side surface S9 of the fifth lens L5, the center thickness D9 of the fifth lens L5, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum angle of view of the optical lens, the image height FOV corresponding to the maximum angle of view of the optical lens, the center thickness D3 of the second lens L2, the center thickness D11 of the sixth lens L6, and the material refractive index Nd4 of the fourth lens L4.

TABLE 4

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	311.8917	2.4878	1.90	31.32
2	-64.2685	1.8120
					3	28.6268	1.0683	1.51	56.82
4	4.3814	6.7270
					STO	All-round	0.8976
6	-12.4997	1.3974	1.73	28.32
					7	36.4229	5.5050	1.75	52.34
8	-12.0818	0.3552
					9	23.0052	3.3627	1.80	46.57
10	-125.4707	4.7765
					11	14.0990	5.7382	1.53	55.58
12	-14.5945	0.5634
					13	All-round	0.7000	1.52	54.09
14	All-round	6.5001
					IMA	All-round

TABLE 5

Flour mark

K

A

B

C

D

E

3

-8.3632

-2.1594E-04

1.9389E-06

-2.2429E-07

6.6358E-09

-6.8537E-11

4

-0.8181

1.4868E-04

1.4117E-04

-1.4313E-05

7.4177E-07

-1.4734E-08

11

-1.3026

-6.7874E-06

-6.8984E-07

4.1315E-08

-7.2181E-10

7.4731E-12

12

-34.4034

-5.8781E-04

2.8371E-05

-6.4960E-07

8.0288E-09

-3.4412E-11

TABLE 6

In the present embodiment, F1/F10.656 is satisfied between the focal length value F1 of the first lens L1 and the focal length value F of the entire group of optical lenses; a focal length value F3 of the third lens L3 and a focal length value F4 of the fourth lens L4 satisfy that F3/F4 is-1.012; F5/F4.367 is satisfied between the focal length value F5 of the fifth lens L5 and the focal length value F of the entire group of optical lenses; F2/F6 is-0.701 between the focal length value F2 of the second lens L2 and the focal length value F6 of the sixth lens L6; r9/d 9-6.841 is satisfied between the radius of curvature R9 of the object-side surface S9 of the fifth lens L5 and the center thickness d9 of the fifth lens L5; d3/d11 of the center thickness d3 of the second lens L2 and the center thickness d11 of the sixth lens L6 is 0.186; and D/H/FOV is 0.041 between 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.

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.

The first lens L1 is a meniscus lens with positive power, with the object side S1 being concave and the image side S2 being convex.

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). The following table 8 shows the conic coefficients k and the high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3 to S4, S11 to S12 in example 3. Table 9 below gives the entire group focal length value F of the optical lens of example 3, the focal length values F1 to F6 of the first lens L1 to the sixth lens L6, the radius of curvature R9 of the object-side surface S9 of the fifth lens L5, the center thickness D9 of the fifth lens L5, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum angle of view of the optical lens, the image height FOV corresponding to the maximum angle of view of the optical lens, the center thickness D3 of the second lens L2, the center thickness D11 of the sixth lens L6, and the material refractive index Nd4 of the fourth lens L4.

TABLE 7

TABLE 8

Flour mark

K

A

B

C

D

E

3

-7.3490

-2.1594E-04

1.9389E-06

-2.2386E-07

6.6167E-09

-7.1309E-11

4

-0.8365

1.0409E-04

1.4197E-04

-1.4351E-05

7.4094E-07

-1.4755E-08

11

-1.2980

-6.2365E-06

-7.0860E-07

4.1403E-08

-7.1671E-10

7.4605E-12

12

-35.9027

-5.9207E-04

2.8418E-05

-6.4959E-07

8.0188E-09

-3.4191E-11

TABLE 9

F(mm)	5.6975	d9(mm)	4.2817
				F1(mm)	73.7376	D(mm)	22.3181
F2(mm)	-10.4896	H(mm)	7.7300
				F3(mm)	-13.0589	FOV(°)	70.0000
F4(mm)	12.8141	d3(mm)	1.1333
				F5(mm)	25.1089	d11(mm)	5.7260
F6(mm)	14.6737	Nd4	1.75
				R9(mm)	23.1834

In the present embodiment, F1/F12.942 is satisfied between the focal length value F1 of the first lens L1 and the focal length value F of the entire group of optical lenses; F3/F4 is-1.019 between the focal length value F3 of the third lens L3 and the focal length value F4 of the fourth lens L4; F5/F4.407 is satisfied between the focal length value F5 of the fifth lens L5 and the focal length value F of the entire group of optical lenses; F2/F6 is-0.715 between the focal length value F2 of the second lens L2 and the focal length value F6 of the sixth lens L6; the radius of curvature R9 of the object-side surface S9 of the fifth lens L5 and the center thickness d9 of the fifth lens L5 satisfy R9/d9 of 5.414; d3/d11 is 0.198 between the central thickness d3 of the second lens L2 and the central thickness d11 of the sixth lens L6; and D/H/FOV is 0.041 between 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.

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). The following table 11 shows the conic coefficients k and the high-order term coefficients A, B, C, D and E which can be used for the aspherical lens surfaces S3 to S4, S11 to S12 in example 4. Table 12 below gives the entire group focal length value F of the optical lens of example 4, the focal length values F1 to F6 of the first lens L1 to the sixth lens L6, the radius of curvature R9 of the object-side surface S9 of the fifth lens L5, the center thickness D9 of the fifth lens L5, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum angle of view of the optical lens, the image height FOV corresponding to the maximum angle of view of the optical lens, the center thickness D3 of the second lens L2, the center thickness D11 of the sixth lens L6, and the material refractive index Nd4 of the fourth lens L4.

Watch 10

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	All-round	2.4981	1.90	31.32
2	-55.1685	1.5880
					3	26.1499	1.0811	1.51	56.82
4	4.3541	6.9091
					STO	All-round	0.9629
6	-12.6927	1.4093	1.73	28.32
					7	34.5183	5.5113	1.73	54.68
8	-11.9021	0.0824
					9	23.3743	4.1267	1.80	46.57
10	-126.2518	4.6050
					11	14.0777	5.7453	1.53	55.58
12	-14.8965	0.6033
					13	All-round	0.7000	1.52	54.09
14	All-round	6.6502
					IMA	All-round

TABLE 11

TABLE 12

F(mm)	5.6940	d9(mm)	4.1267
				F1(mm)	62.6944	D(mm)	20.8573
F2(mm)	-10.3510	H(mm)	7.7720
				F3(mm)	-12.9570	FOV(°)	70.0000
F4(mm)	12.9868	d3(mm)	1.0811
				F5(mm)	25.3089	d11(mm)	5.7453
F6(mm)	14.7305	Nd4	1.73
				R9(mm)	23.3743

In the present embodiment, F1/F11.011 is satisfied between the focal length value F1 of the first lens L1 and the focal length value F of the entire group of optical lenses; a focal length value F3 of the third lens L3 and a focal length value F4 of the fourth lens L4 satisfy that F3/F4 is-0.998; F5/F4.445 is satisfied between the focal length value F5 of the fifth lens L5 and the focal length value F of the entire group of optical lenses; F2/F6 is-0.703 between the focal length value F2 of the second lens L2 and the focal length value F6 of the sixth lens L6; r9/d 9-5.664 is satisfied between the radius of curvature R9 of the object-side surface S9 of the fifth lens L5 and the center thickness d9 of the fifth lens L5; d3/d11 of 0.188 is satisfied between the central thickness d3 of the second lens L2 and the central thickness d11 of the sixth lens L6; and D/H/FOV is 0.038 between 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.

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

Watch 13

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

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

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

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

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

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

the number of lenses with focal power in the optical lens is six; and

the central thickness d3 of the second lens and the central thickness d11 of the sixth lens satisfy that: d3/d11 is more than or equal to 0.1 and less than or equal to 0.3.

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

3. An optical lens barrel according to claim 1, wherein the object side surface of the first lens is a plane.

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

5. An optical lens according to claim 1, characterized in that the second lens and the sixth lens are both aspherical lenses.

6. An optical lens according to claim 1, wherein the third lens and the fourth lens are cemented to each other to form a cemented lens.

7. An optical lens according to any one of claims 1 to 6, characterized in that the focal length value F1 of the first lens and the entire set of focal length values F of the optical lens satisfy: F1/F is more than or equal to 8 and less than or equal to 15.

8. An optical lens barrel according to any one of claims 1 to 6, wherein a radius of curvature R9 of the object side surface of the fifth lens and a center thickness d9 of the fifth lens satisfy: r9/d9 is more than or equal to 4 and less than or equal to 7.5.

9. An optical lens according to any one of claims 1 to 6, characterized in that a focal length value F3 of the third lens and a focal length value F4 of the fourth lens satisfy: F3/F4 of-1.3 is less than or equal to-0.8.

10. An optical lens according to any one of claims 1 to 6, characterized in that the focal length value F5 of the fifth lens and the entire group of focal length values F of the optical lens satisfy: F5/F is more than or equal to 3 and less than or equal to 6.

11. An optical lens according to any one of claims 1 to 6, characterized in that a focal length value F2 of the second lens and a focal length value F6 of the sixth lens satisfy: F2/F6 of more than or equal to-0.9 and less than or equal to-0.4.

12. An optical lens according to any one of claims 1 to 6, 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 45 multiplied by 180 degrees.

13. 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, the fourth lens, the fifth lens and the sixth lens each have a positive optical power;

the second lens and the third lens each have a negative optical power;

the third lens is glued with the fourth lens;

the curvature radius R9 of the object side surface of the fifth lens and the central thickness d9 of the fifth lens satisfy that: r9/d9 is more than or equal to 4 and less than or equal to 7.5; and

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

14. An optical lens barrel according to claim 13, wherein the object side surface and the image side surface of the first lens are convex.

15. An optical lens barrel according to claim 13, wherein the object side surface of the first lens element is a flat surface and the image side surface is a convex surface.

16. An optical lens barrel according to claim 13, wherein the object side surface of the first lens element is concave and the image side surface is convex.

17. An optical lens barrel according to claim 13, wherein the second lens element has a convex object-side surface and a concave image-side surface.

18. An optical lens barrel according to claim 13, wherein the object side surface and the image side surface of the third lens are both concave.

19. An optical lens barrel according to claim 13, wherein the object side surface and the image side surface of the fourth lens are convex.

20. An optical lens barrel according to claim 13, wherein the object-side surface and the image-side surface of the fifth lens element are convex.

21. An optical lens barrel according to claim 13, wherein the object-side surface and the image-side surface of the sixth lens element are convex.

22. An optical lens barrel according to any one of claims 13 to 21, wherein the second lens and the sixth lens are both aspherical lenses.

23. An optical lens element according to any one of claims 13-21, characterized in that the focal length value F1 of the first lens element and the entire set of focal length values F of the optical lens element satisfy: F1/F is more than or equal to 8 and less than or equal to 15.

24. An optical lens element according to any of claims 13-21, characterized in that between the focal value F3 of the third lens and the focal value F4 of the fourth lens, it is satisfied that: F3/F4 of-1.3 is less than or equal to-0.8.

25. An optical lens element according to any one of claims 13 to 21, characterized in that the focal length value F5 of the fifth lens element and the entire group of focal length values F of the optical lens element satisfy: F5/F is more than or equal to 3 and less than or equal to 6.

26. An optical lens element according to any of claims 13-21, characterized in that the focal length value F2 of the second lens element and the focal length value F6 of the sixth lens element satisfy: F2/F6 of more than or equal to-0.9 and less than or equal to-0.4.

27. An optical lens barrel according to any one of claims 13 to 21, wherein the central thickness d3 of the second lens and the central thickness d11 of the sixth lens satisfy: d3/d11 is more than or equal to 0.1 and less than or equal to 0.3.

28. An optical lens element according to any of claims 13-21, wherein the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens element corresponding to the maximum field angle of the optical lens element, and the image height H corresponding to the maximum field angle of the optical lens element satisfy: D/H/FOV is less than or equal to 45 multiplied by 180 degrees.