CN110412719B

CN110412719B - Optical lens

Info

Publication number: CN110412719B
Application number: CN201810397941.1A
Authority: CN
Inventors: 谢前森; 陈雨曦; 姚波; 王东方
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2018-04-28
Filing date: 2018-04-28
Publication date: 2021-10-26
Anticipated expiration: 2038-04-28
Also published as: CN110412719A

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 the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens can have negative focal power, and 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 can have positive focal power, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; 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 negative focal power, and the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; and the sixth lens element may have a negative optical power, and both the object-side surface and the image-side surface thereof may be concave. According to the optical lens, the beneficial effects of miniaturization, small front-end caliber, high pixel 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 vehicle-mounted lens needs to be installed at a certain fixed position of a vehicle due to application limitation, and the lens is required not to be too large, so that the aesthetic condition of the vehicle is influenced. Miniaturization of the onboard lens is therefore of great importance. In recent years, the development of the vehicle-mounted lens gradually enters a good environment, and the requirement of the market on the vehicle-mounted lens is gradually improved; meanwhile, the whole development trend makes the improvement of the pixels of the vehicle-mounted lens very urgent. Matching large chip high pixel vehicular lenses is a market trend for whole vehicular lenses. Generally, as the chip size increases, the total lens length also increases proportionally, which seriously affects the installation and use of the vehicle-mounted lens, so the technology of matching a large chip but reducing the lens size is very critical.

Therefore, it is necessary to design an optical lens that satisfies the performance of shorter TTL, miniaturization, small front-end aperture, high pixel, etc. under the same imaging plane.

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

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

In one embodiment, at least one of the second lens, the third lens, and the sixth lens may be 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 total optical length TTL 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 may satisfy: TTL/h/FOV is less than or equal to 0.025.

In one embodiment, the conditional formula may be satisfied: D/h/FOV is less than or equal to 0.02, wherein the FOV is the maximum field angle of the optical lens; d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens; and h is the image height corresponding to the maximum field angle of the optical lens.

In one embodiment, the optical lens may further include a stop disposed between the third lens and the fourth 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. The first lens can have negative focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens, the fifth lens and the sixth lens may each have a negative focal power; the third lens and the fourth lens can both have positive focal power; and the fourth lens can be glued with the fifth lens, wherein the total optical length TTL 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 can satisfy the following conditions: TTL/h/FOV is less than or equal to 0.025.

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, the object-side surface of the third 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, the object-side surface of the fifth 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 sixth lens may be concave.

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 beneficial effect of high pixel, miniaturization, shorter TTL (transistor-transistor logic) under the same imaging surface, balanced chromatic aberration and the like 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; and

fig. 3 is a schematic view showing a structure of an optical lens according to embodiment 3 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 negative power, and can have a convex object-side surface and a concave image-side surface. The first lens is arranged in a meniscus shape which is convex towards the object side, so that light rays with a large field of view can be collected as far as possible and enter a rear optical system. In practical application, considering that the vehicle-mounted lens is installed outdoors and used in an environment, and may be in severe weather such as rain, snow and the like, such a meniscus shape design protruding toward the object side is beneficial to the use of the lens in the severe environment, for example, beneficial to the sliding of water drops, and reduces the influence on imaging.

The second lens element can have a negative power, and can have a concave object-side surface and a convex image-side surface. The second lens can disperse the light collected by the first lens, so that the light can be stably transited to the rear optical system, and the effect of larger final imaging surface is achieved.

The third lens element can have a positive power, and can have a convex object-side surface and a concave image-side surface. The third lens can converge light rays, so that the diffused light rays can smoothly enter a rear system, and the total length of the system can be favorably reduced.

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 a negative power, and can have a concave object-side surface and a convex image-side surface.

The sixth lens element can have a negative optical power and both the object-side surface and the image-side surface can be concave. The last sixth lens is a negative lens, so that the passing light rays can be diffused, the image height is larger, the purpose of matching a larger chip is achieved, and other performances of the lens can be considered.

In an exemplary embodiment, a diaphragm for limiting the light beam may be disposed between, for example, the third lens and the fourth lens to further improve the imaging quality of the lens. When the diaphragm is arranged between the third lens and the fourth 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 will be appreciated that the position of the diaphragm is not limited by the above description, but may be provided in other positions as required.

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 in front has positive focal power, the fifth lens in back has negative focal power, and the positive lens and the negative lens are matched, so that the forward light is favorably converged and then transited to a rear system, the diameter/size of a rear port of the lens is reduced, and the total length of the system is reduced.

In an exemplary embodiment, TTL/F ≦ 4, more desirably, TTL/F ≦ 3.5 may be further satisfied between the total optical length TTL of the optical lens (i.e., the distance on the optical axis from the center of the object side surface of the first lens to the imaging surface of the optical lens) and the entire group focal length value F of the optical lens. 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 total optical length TTL 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 may satisfy TTL/h/FOV ≦ 0.025, and more desirably, TTL/h/FOV ≦ 0.02 may be further satisfied. With such a configuration, there is a shorter TTL in the same imaging plane than in other lenses.

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 ≦ 0.02, more desirably D, h and FOV may further satisfy D/h/FOV ≦ 0.01. The conditional expression D/h/FOV is less than or equal to 0.02, and the small caliber at the front end of the lens can be ensured.

In an exemplary embodiment, at least one of the second lens, the third lens, and the sixth lens may be 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.

According to the lens adopting the structure of six lenses, the specific framework is used to achieve the characteristic of miniaturization of a large chip, so that the volume of the lens is reduced, no assembly obstacle exists in the installation process, and the appearance of a vehicle is not affected after the lens is installed. Meanwhile, the high imaging performance of the lens is considered.

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 meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.

The second lens L2 is a meniscus lens with negative power, with the object side S3 being concave and the image side S4 being convex. The second lens L2 is an aspherical lens, and both the object-side surface S3 and the image-side surface S4 are aspherical.

The third lens L3 is a meniscus lens with positive power, with the object side S5 being convex and the image side S6 being concave. The third lens L3 is an aspherical lens, and both the object-side surface S5 and the image-side surface S6 are aspherical.

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 biconcave lens with negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The sixth lens element L6 is an aspherical lens, and both the object-side surface S11 and the image-side surface S12 are aspherical.

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. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In the optical lens of the present embodiment, a stop STO may be provided between the third lens L3 and the fourth lens L4 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	6.0000	1.0000	1.77	50
2	3.0000	2.2000
					3	-4.0000	1.3000	1.53	5 6
4	-45.0000	0.1000
					5	3.0000	2.0000	1.8	4 1
6	11.0000	0.2000
					STO	All-round	0.4000
8	11.0000	2.5000	1.77	5 0
					9	-2.0000	0.6000	1.85	24
10	-6.0000	1.8000
					11	-37.0000	2.5500	1.54	56
12	15.0000	0.6200
					13	All-round	0.5500	1.52	64
14	All-round	0.2000
					15	All-round	0.4000	1.52	64
16	All-round	0.6000
					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 miniaturization, high pixel, small front end caliber 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 high-order term coefficients A, B, C, D and E of the aspherical lens surfaces S3, S4, S5, S6, S11 and S12 that can be used in example 1.

TABLE 2

Flour mark

K

A

B

C

D

E

3

-0.2462

1.2594E-02

-1.8262E-03

2.9802E-04

-3.0326E-05

1.5461E-06

4

396.2385

3.7127E-04

2.9050E-04

3.4473E-04

-1.1878E-04

5.0000E-05

5

0.4507

-7.8933E-03

1.3215E-03

-2.2145E-04

1.3755E-05

-1.0659E-06

6

14.6115

9.9069E-03

-4.5683E-03

3.3637E-03

-9.9344E-04

1.2609E-04

11

-100.0000

-7.2928E-03

2.3877E-04

-4.5358E-05

3.0694E-06

-8.2340E-08

12

-100.0000

-2.5968E-03

-2.5287E-04

1.7718E-05

-7.4419E-07

2.1180E-08

Table 3 below gives the entire group focal length value F of the optical lens of example 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 plane S17), the image height h corresponding to the maximum angle of view of the optical lens, 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, and the maximum angle of view FOV of the optical lens.

TABLE 3

In the present embodiment, TTL/F is 3.460 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the total optical length TTL 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 meet the condition that TTL/h/FOV is 0.018; and D/h/FOV is equal to 0.008 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.

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.

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 S3, S4, S5, S6, S11 and S12 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 plane S17), the image height h corresponding to the maximum angle of view of the optical lens, 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, and the maximum angle of view FOV of the optical lens.

TABLE 4

TABLE 5

Flour mark

K

A

B

C

D

E

3

-0.1439

1.0331E-02

-4.3841E-04

3.0468E-05

1.9873E-06

-1.3006E-07

4

1.7499

8.5476E-03

-1.1195E-03

3.1181E-04

-2.6584E-05

2.0394E-06

5

0.4340

-1.2323E-03

1.2229E-03

-5.7263E-04

1.3102E-04

-1.0531E-05

6

14.8881

4.6729E-03

-1.9989E-03

1.7405E-03

-5.3412E-04

7.5532E-05

11

-100.0000

-6.8586E-03

1.2939E-04

2.2605E-06

-8.2559E-06

4.2739E-07

12

-100.0000

-2.1321E-03

-2.6940E-04

2.2942E-05

-1.1337E-06

2.3916E-08

TABLE 6

Parameter(s)	F(mm)	TTL(mm)	h(mm)	D(mm)	FOV(°)
						Numerical value	5.303	16.928	8.982	6.911	110

In the present embodiment, TTL/F is 3.192 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the total optical length TTL 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 meet the condition that TTL/h/FOV is 0.017; and D/h/FOV is 0.007 between 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.

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 S3, S4, S5, S6, S11 and S12 in example 3. Table 9 below shows the entire group focal length value F of the optical lens of example 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 plane S17), the image height h corresponding to the maximum angle of view of the optical lens, 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, and the maximum angle of view FOV of the optical lens.

TABLE 7

TABLE 8

Flour mark

K

A

B

C

D

E

3

-0.5028

1.3183E-02

-1.9111E-03

3.2999E-04

-3.6776E-05

1.8596E-06

4

315.7521

3.0112E-03

-2.8315E-05

6.1807E-04

-1.8401E-04

1.8817E-05

5

0.5379

-8.4902E-03

1.7831E-03

-4.2101E-04

5.8910E-05

-5.3741E-06

6

15.0299

9.5165E-03

-5.8858E-03

4.7037E-03

-1.5196E-03

2.0443E-04

11

-100.0000

-9.3628E-03

3.5622E-04

-7.1093E-05

3.2689E-06

-7.2371E-08

12

-100.0000

-3.4668E-03

-1.5766E-04

9.5798E-06

-3.7466E-07

6.1682E-09

TABLE 9

Parameter(s)	F(mm)	TTL(mm)	h(mm)	D(mm)	FOV(°)
						Numerical value	4.899	16.825	9.508	7.416	120

In the present embodiment, TTL/F is 3.434 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the total optical length TTL 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 meet the condition that TTL/h/FOV is 0.015; and D/h/FOV is 0.007 between 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.

In summary, examples 1 to 3 each satisfy the relationship shown in table 10 below.

Watch 10

Conditions/examples	1	2	3
				TTL/F	3.460	3.192	3.434
TTL/h/FOV	0.018	0.017	0.015
				D/h/FOV	0.008	0.007	0.007

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, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

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

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

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

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

the maximum field angle FOV of the optical lens, the maximum light transmission caliber 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 meet the requirement that D/h/FOV is multiplied by 180 degrees and is less than or equal to 3.6.

2. An optical lens according to claim 1, characterized in that the fourth lens and the fifth lens are cemented.

3. An optical lens according to claim 1, characterized in that at least one of the second lens, the third lens and the sixth lens is an aspherical mirror.

4. An optical lens barrel according to any one of claims 1 to 3, 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.

5. An optical lens according to any one of claims 1 to 3, wherein an optical total length TTL of the optical lens, an image height h corresponding to a maximum field angle of the optical lens, and a maximum field angle FOV of the optical lens satisfy: TTL/h/FOV multiplied by 180 degrees is less than or equal to 4.5.

6. An optical lens according to any one of claims 1 to 3, characterized in that the optical lens further comprises a diaphragm disposed between the third lens and the fourth lens.

7. 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 second lens, the fifth lens and the sixth lens each have a negative optical power;

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

the fourth lens is cemented with the fifth lens,

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

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 total optical length TTL 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 satisfy the following conditions: TTL/h/FOV multiplied by 180 degrees is less than or equal to 4.5; and

8. An optical lens barrel according to claim 7, wherein the third lens element has a convex object-side surface and a concave image-side surface.

9. An optical lens barrel according to claim 7, wherein the object side surface and the image side surface of the fourth lens are convex.

10. An optical lens barrel according to claim 7, wherein the fifth lens element has a concave object-side surface and a convex image-side surface.

11. An optical lens barrel according to claim 7, wherein the object side surface and the image side surface of the sixth lens are both concave.

12. An optical lens according to any one of claims 7 to 11, characterized in that at least one of the second lens, the third lens and the sixth lens is an aspherical mirror.

13. An optical lens barrel according to any one of claims 7 to 11, 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.

14. An optical lens according to any one of claims 7-11, characterized in that the optical lens further comprises a diaphragm arranged between the third lens and the fourth lens.