CN109960021B

CN109960021B - Optical lens

Info

Publication number: CN109960021B
Application number: CN201711415967.6A
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: 2017-12-25
Filing date: 2017-12-25
Publication date: 2021-09-10
Anticipated expiration: 2037-12-25
Also published as: CN109960021A

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 and a fifth lens. The first lens can have positive focal power, and both the object side surface and the image side surface of the first lens can be convex surfaces; the second lens may have a negative optical power; the third 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; the fourth lens and the fifth lens may each have a positive optical power. According to the optical lens of the present application, effects such as miniaturization, high resolution, small distortion, strong thermal stability, and the like can be achieved.

Description

Optical lens

Technical Field

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

Background

With the continuous popularization and development of automatic/auxiliary driving systems, the optical vehicle-mounted lens is used as an important component for realizing unmanned driving, and the requirements on various performances of the optical vehicle-mounted lens are increasingly raised. For some lenses for special applications, the aperture is required to be small (FNO small) in order to collect more energy, and it is therefore difficult to image objects with high spatial frequency clearly.

For some specific lenses, the diffuse spot is generally controlled in a half range of the pixel size of a chip, and the size of a single pixel on the chip is larger and the limiting spatial frequency is lower.

Therefore, it is necessary to design an optical lens with small size, small distortion, small FNO, high resolution, and strong thermal stability.

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 and a fifth lens. The first lens can have positive focal power, and both the object side surface and the image side surface of the first lens can be convex surfaces; the second lens may have a negative optical power; the third 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; the fourth lens and the fifth lens may each have a positive optical power.

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 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, the optical lens may have at least one aspherical lens. Ideally, the fifth lens is an aspherical mirror.

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 4.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens, the thickness d3 of the second lens, and the radius of curvature R4 of the image-side surface of the second lens may satisfy: not less than 0.7 (R3-d3)/R4 not more than 1.3.

In one embodiment, the radius of curvature R6 of the object-side surface of the third lens, the thickness d6 of the third lens, and the radius of curvature R7 of the image-side surface of the third lens may satisfy: not less than 0.7 (R6-d6)/R7 not more than 1.3.

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 and a fifth lens. Wherein the first lens, the fourth lens and the fifth lens may have positive optical power; the second lens and the third lens may have negative optical power; and the radius of curvature R6 of the object-side surface of the third lens, the thickness d6 of the third lens, and the radius of curvature R7 of the image-side surface of the third lens may satisfy: not less than 0.7 (R6-d6)/R7 not more than 1.3.

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

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

This application has adopted five lenses for example, through the shape of optimizing setting lens, rationally distributes the focal power etc. of each lens, realizes at least one in beneficial effect such as miniaturization, high resolution, little FNO, high, the thermal stability is strong, little distortion, little chief ray angle of optical lens.

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 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, five lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five 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 power, and can have a convex object-side surface and a convex image-side surface. The first lens can collect light rays in a visual field as much as possible, so that the light rays enter the rear optical system. The first lens adopts a biconvex shape design, which is beneficial to reducing the caliber of the second lens and the distance between the first lens and the second lens and effectively controlling TTL. The first lens can adopt a lens with a large refractive index, so that the thickness of the first lens is favorably reduced, and the TTL is shortened. For example, the refractive index Nd1 of the first lens may satisfy: nd 1. gtoreq.1.75, more specifically, Nd 1. gtoreq.1.77 can be further satisfied.

The second lens may have a negative optical power. The second lens element may be a meniscus lens element with the convex surface facing the object side (i.e. the object side is convex and the image side is concave). Further, the second lens may be shaped to approximate a concentric circle to facilitate reducing system aberrations and reducing distortion. That is, the radius of curvature R3 of the object-side surface of the second lens, the thickness d3 of the second lens, and the radius of curvature R4 of the image-side surface of the second lens may satisfy 0.7 ≦ (R3-d3)/R4 ≦ 1.3, more specifically, may further satisfy 0.95 ≦ (R3-d3)/R4 ≦ 1.20.

The third lens element can have a negative power, and can have a concave object-side surface and a convex image-side surface. The third lens can be a meniscus positive lens with the convex surface facing the image side, and the shape can be further designed to be close to a concentric circle shape, so that the system aberration can be favorably reduced, and the distortion can be reduced. That is, the radius of curvature R6 of the object-side surface of the third lens, the thickness d6 of the third lens, and the radius of curvature R7 of the image-side surface of the third lens may satisfy 0.7 ≦ (R6-d6)/R7 ≦ 1.3, and more specifically, may further satisfy 0.80 ≦ (R6-d6)/R7 ≦ 1.17. In order to achieve miniaturization, the air space between the third lens and the fourth lens is reduced, and the refractive index of the third lens should be large. For example, the refractive index Nd3 of the third lens may satisfy: nd 3. gtoreq.1.75, more specifically, Nd 3. gtoreq.1.80 can be further satisfied.

The fourth lens may have a positive optical power. Optionally, both the object-side surface and the image-side surface of the fourth lens may be convex. In order to smoothly transit the light emitted from the third lens to the fifth lens, the refractive index of the fourth lens should be small. For example, the refractive index Nd4 of the fourth lens may satisfy: nd 4. ltoreq.1.72, more specifically, Nd 4. ltoreq.1.70 can be further satisfied.

The fifth lens may have a positive optical power. Optionally, both the object-side surface and the image-side surface of the fifth lens can be convex. In order to enhance the performance of the lens under the conditions of high and low temperature environments, the fifth lens can use a material with a large dn/dt coefficient. For example, the variation dn/dt (5) of the refractive index of the material of the fifth lens along with the temperature change can satisfy the following conditions: dn/dt (5) is less than or equal to-2 x 10^-5/℃。

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.

In an exemplary embodiment, TTL/F ≦ 4 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 TTL/F ≦ 3.90. The condition TTL/F is less than or equal to 4, and the miniaturization characteristic of the lens can be realized.

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. The fifth lens of the optical lens can adopt a glass lens so as to reduce the influence of the environment on the whole system, reduce the tolerance sensitivity of the lens, facilitate the thermal difference elimination treatment and improve the whole performance of the optical lens.

In an exemplary embodiment, the fifth lens may 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 fifth lens can be configured to be a glass aspheric lens, so that distortion and aberration of the whole optical system are reduced, and the resolution quality is improved.

The optical lens according to the above-described embodiment of the present application has at least one of advantageous effects of a small aperture (small FNO), a high resolution, a high contrast, a strong thermal stability, a small distortion, miniaturization, a small chief ray angle, and the like.

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

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

Example 1

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

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

The first lens element L1 is a biconvex lens with positive refractive power, and has a convex object-side surface S1 and a convex image-side surface S2.

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 meniscus lens with negative power, with the object side S6 being concave and the image side S7 being convex.

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 element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11.

Optionally, the optical lens may further include a filter L6 and/or a protective lens L6' having an object side S12 and an image side S13. Filter L6 can be used to correct for color deviations. The protective lens L6' 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 S13 and is finally imaged on the imaging surface S14.

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

The present embodiment adopts five 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 has the beneficial effects of miniaturization, high resolution, small distortion, high relative illumination, small aperture, strong thermal stability, small main light angle and the like. Each aspherical surface type Z is defined by the following formula:

wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient conc; A. b, C, D, E are all high order term coefficients. Table 2 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S10 and S11 in example 1.

TABLE 2

Flour mark

K

A

B

C

D

E

10

-5.37E+00

-8.85E-06

-1.99E-07

-1.42E-08

2.21E-10

-1.61E-12

11

-1.20E+00

1.09E-04

-1.36E-06

1.29E-08

-8.16E-11

-1.28E-13

Table 3 below gives the entire group focal length value F of the optical lens of embodiment 1, the total optical length TTL of the optical lens (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the image forming surface S14), the refractive index Nd1 of the first lens L1, the refractive index Nd3 of the third lens L3, and the refractive index Nd4 of the fourth lens L4.

TABLE 3

F(mm)	11.661	Nd3	1.80
				TTL(mm)	41.596	Nd4	1.70
Nd1	1.77

In the present embodiment, TTL/F is 3.567 between the total optical length TTL of the optical lens and the entire focal length F of the optical lens; the radius of curvature R3 of the object-side surface S3 of the second lens L2, the thickness d3 of the second lens L2, and the radius of curvature R4 of the image-side surface S4 of the second lens L2 satisfy (R3-d3)/R4 being 0.959; the radius of curvature R6 of the object-side surface S6 of the third lens L3, the thickness d6 of the third lens L3, and the radius of curvature R7 of the image-side surface S7 of the third lens L3 satisfy (R6-d6)/R7 being 1.164; and the variation dn/dt (5) of the refractive index of the material of the fifth lens L5 along with the temperature change satisfies the following conditions: dn/dt (5) — 2.54 × 10^-5/℃。

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, and a fifth lens L5.

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 the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S10 and S11 in example 2. Table 6 below gives the entire group focal length value F of the optical lens of example 2, the total optical length TTL of the optical lens (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the image forming surface S14), the refractive index Nd1 of the first lens L1, the refractive index Nd3 of the third lens L3, and the 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	52.737	2.908	1.80	46.6
2	-98.514	0.100
					3	11.328	5.137	1.70	55.5
4	5.159	3.231
					STO	All-round	1.161
6	-7.191	5.329	1.80	46.6
					7	-15.604	0.447
8	23.514	4.880	1.70	55.5
					9	-23.514	3.592
10	14.945	6.365	1.50	81.6
					11	-12.196	1.255
12	All-round	0.700	1.52	54.5
					13	All-round	7.895
IMA	All-round

TABLE 5

Flour mark

K

A

B

C

D

E

10

-4.43E+00

4.96E-06

6.22E-09

-1.42E-08

2.21E-10

-1.61E-12

11

-1.58E+00

1.37E-04

-1.21E-06

1.34E-08

-7.89E-11

1.03E-13

TABLE 6

F(mm)	11.202	Nd3	1.80
				TTL(mm)	43.000	Nd4	1.70
Nd1	1.80

In the present embodiment, TTL/F is 3.839 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the radius of curvature R3 of the object-side surface S3 of the second lens L2, the thickness d3 of the second lens L2, and the radius of curvature R4 of the image-side surface S4 of the second lens L2 satisfy (R3-d3)/R4 being 1.200; the radius of curvature R6 of the object-side surface S6 of the third lens L3, the thickness d6 of the third lens L3, and the radius of curvature R7 of the image-side surface S7 of the third lens L3 satisfy (R6-d6)/R7 being 0.802; and the variation dn/dt (5) of the refractive index of the material of the fifth lens L5 along with the temperature change satisfies the following conditions: dn/dt (5) — 2.54 × 10^-5/℃。

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, and a fifth lens L5.

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 the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S10 and S11 in example 3. Table 9 below gives the entire group focal length value F of the optical lens of embodiment 3, the total optical length TTL of the optical lens (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the image forming surface S14), the refractive index Nd1 of the first lens L1, the refractive index Nd3 of the third lens L3, and the refractive index Nd4 of the fourth lens L4.

TABLE 7

TABLE 8

Flour mark

K

A

B

C

D

E

10

-5.42E+00

-1.47E-05

-2.31E-07

-1.42E-08

2.21E-10

-1.61E-12

11

-1.33E+00

1.18E-04

-1.33E-06

1.24E-08

-8.58E-11

1.02E-13

TABLE 9

F(mm)	11.199	Nd3	1.85
				TTL(mm)	42.327	Nd4	1.70
Nd1	1.80

In the present embodiment, TTL/F is 3.779 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the radius of curvature R3 of the object-side surface S3 of the second lens L2, the thickness d3 of the second lens L2, and the radius of curvature R4 of the image-side surface S4 of the second lens L2 satisfy (R3-d3)/R4 being 1.100; radius of curvature R6 of object-side surface S6 of third lens L3, and third lensThe thickness d6 of the L3 and the radius of curvature R7 of the image side surface S7 of the third lens L3 satisfy (R6-d6)/R7 of 0.850; and the variation dn/dt (5) of the refractive index of the material of the fifth lens L5 along with the temperature change satisfies the following conditions: dn/dt (5) — 2.54 × 10^-5/℃。

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, and a fifth lens L5.

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 the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S10 and S11 in example 4. Table 12 below gives the entire group focal length value F of the optical lens of example 4, the total optical length TTL of the optical lens (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the image forming surface S14), the refractive index Nd1 of the first lens L1, the refractive index Nd3 of the third lens L3, and the refractive index Nd4 of the fourth lens L4.

Watch 10

TABLE 11

Flour mark

K

A

B

C

D

E

10

-4.66E+00

1.51E-07

5.70E-07

-1.42E-08

2.21E-10

-1.61E-12

11

-1.44E+00

1.30E-04

-8.72E-07

1.30E-08

-8.22E-11

3.73E-13

TABLE 12

F(mm)	11.044	Nd3	1.85
				TTL(mm)	43.056	Nd4	1.63
Nd1	1.77

In the present embodiment, TTL/F is 3.899 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the radius of curvature R3 of the object-side surface S3 of the second lens L2, the thickness d3 of the second lens L2, and the radius of curvature R4 of the image-side surface S4 of the second lens L2 satisfy (R3-d3)/R4 being 1.150; the radius of curvature R6 of the object-side surface S6 of the third lens L3, the thickness d6 of the third lens L3, and the radius of curvature R7 of the image-side surface S7 of the third lens L3 satisfy (R6-d6)/R7 being 0.900; and the variation dn/dt (5) of the refractive index of the material of the fifth lens L5 along with the temperature change satisfies the following conditions: dn/dt (5) — 2.54 × 10^-5/℃。

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	3.567	3.839	3.779	3.899
(R3-d3)/R4	0.959	1.200	1.100	1.150
					(R6-d6)/R7	1.164	0.802	0.850	0.900

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, and a fifth lens,

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

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

the second lens has a negative optical power;

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

the fourth lens and the fifth lens each have positive optical power;

five lenses having focal power in the optical lens, an

The curvature radius R3 of the object side surface of the second lens, the thickness d3 of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: not less than 0.7 (R3-d3)/R4 not more than 1.3.

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

3. An optical lens barrel according to claim 1, wherein the object-side surface and the image-side surface of the fifth lens element are convex.

4. An optical lens according to claim 1, characterized in that the optical lens has at least one aspherical lens.

5. An optical lens according to claim 4, characterized in that the fifth lens is an aspherical mirror.

6. An optical lens barrel according to claim 1, wherein the object-side surface and the image-side surface of the fourth lens are convex.

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 4.

8. An optical lens according to claim 1, characterized in that the radius of curvature R6 of the object side surface of the third lens, the thickness d6 of the third lens and the radius of curvature R7 of the image side surface of the third lens satisfy between: not less than 0.7 (R6-d6)/R7 not more than 1.3.

9. 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, and a fifth lens,

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

the first lens, the fourth lens, and the fifth lens have positive optical power;

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

the radius of curvature R6 of the object side surface of the third lens, the thickness d6 of the third lens and the radius of curvature R7 of the image side surface of the third lens satisfy: not less than 0.7 (R6-d 6)/not more than 1.3 of R7,

wherein the optical lens has five lenses having focal power, an

Wherein the curvature radius R3 of the object side surface of the second lens, the thickness d3 of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: not less than 0.7 (R3-d3)/R4 not more than 1.3.

10. An optical lens barrel according to claim 9, wherein the object-side surface and the image-side surface of the first lens are convex.

11. An optical lens barrel according to claim 9, wherein the second lens element has a convex object-side surface and a concave image-side surface.

12. An optical lens barrel according to claim 9, wherein the third lens element has a concave object-side surface and a convex image-side surface.

13. An optical lens barrel according to claim 9, wherein the object-side surface and the image-side surface of the fifth lens element are convex.

14. An optical lens according to claim 9, characterized in that the optical lens has at least one aspherical lens.

15. An optical lens according to claim 14, characterized in that the fifth lens is an aspherical mirror.

16. An optical lens barrel according to claim 9, wherein the object-side surface and the image-side surface of the fourth lens are convex.

17. An optical lens barrel according to any one of claims 9 to 16, 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 4.