CN109001886B - Optical lens - Google Patents

Abstract

The application discloses an optical lens, this optical lens includes along optical axis from the object side to the image side in proper order: 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 has negative focal power, and the image side surface of the first lens is a concave surface; the second lens has positive 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 positive 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 sixth lens both have positive focal power; and the fifth lens has a negative power.

Description

Optical lens

Technical Field

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

Background

As the requirements for camera pixels increase, the corresponding chip size increases, resulting in a concomitant increase in the size of the overall lens.

However, for some applications with limited mounting locations, a small size lens is required to meet the mounting requirements. For example, a vehicle-mounted lens needs to be installed in a vehicle, the installation position of the lens is limited, and a special lens design needs to be used to meet the requirement of small size.

In addition, the vehicle-mounted lens is widely applied to a vehicle-mounted driving assistance system to assist a driver in driving, even to automatically drive. In view of safety, there are high demands on the on-vehicle lens in terms of image sharpness, image plane size, angle of view, and the like.

Most of the existing vehicle-mounted lenses cannot simultaneously achieve large imaging size, high pixel, large viewing angle and miniaturization.

Disclosure of Invention

The present invention provides an optical lens applicable to vehicle-mounted mounting that can solve at least or partially at least one of the above-mentioned disadvantages of the prior art.

One aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens 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 image side surface of the first lens can be a concave surface; the second lens can have positive focal power, and the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the third lens can have positive focal power, and the object side surface of the third lens can be a concave surface, and the image side surface of the third lens can be a convex surface; the fourth lens and the sixth lens may each have a positive optical power; and the fifth lens may have a negative optical power.

In one embodiment, the object side surface of the first lens may be convex.

In one embodiment, the object side surface of the first lens may be concave.

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

In one embodiment, the fourth lens and the fifth lens may be cemented to constitute a cemented lens.

In one embodiment, the object side surface of the sixth lens element may be convex. Optionally, the image-side surface of the sixth lens element may be convex in the paraxial region and have at least one inflection point; alternatively, the image side surface of the sixth lens may be concave.

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

In one embodiment, a distance TTL between a center of an object side surface of the first lens and an on-axis distance f from an imaging surface of the optical lens and a total focal length f of the optical lens may satisfy 4 ≦ TTL/f ≦ 5.

In one embodiment, the on-axis distance TTL from the center of the object-side surface of the first lens element to the imaging surface 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 ≦ 0.03.

In one embodiment, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy D/h/FOV ≦ 0.015.

Another aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens and the fifth lens can both have negative focal power; the second lens, the fourth lens and the sixth lens may each have positive optical power; the third lens can have positive focal power, and the object side surface of the third lens can be a concave surface, and the image side surface of the third lens can be a convex surface; and the on-axis distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens and the total focal length f can satisfy that TTL/f is more than or equal to 4 and less than or equal to 5.

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

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

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

In one embodiment, the fourth lens and the fifth lens may be cemented to constitute a cemented lens.

In one embodiment, the object side surface of the sixth lens element may be convex. Optionally, the image-side surface of the sixth lens element may be convex in the paraxial region and have at least one inflection point; alternatively, the image side surface of the sixth lens may be concave.

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

In one embodiment, the on-axis distance TTL from the center of the object-side surface of the first lens element to the imaging surface 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 ≦ 0.03.

In one embodiment, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy D/h/FOV ≦ 0.015.

The lens can be a multi-lens (such as six lenses), for example, by reasonably distributing the focal power and the surface type of each lens in the optical lens and the meniscus design of the convex surface of the third lens facing to the image side, the total optical length TTL of the lens can be shortened and the field angle of the lens can be enlarged while the lens is ensured to have large imaging size and high pixels.

Drawings

Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic structural view showing an optical lens according to embodiment 2 of the present application;

fig. 3 is a schematic structural view showing an optical lens according to embodiment 3 of the present application;

fig. 4 is a schematic structural view showing an optical lens according to embodiment 4 of the present application;

fig. 5 is a schematic structural view showing an optical lens according to embodiment 5 of the present application;

fig. 6 is a schematic view showing a structure of an optical lens according to embodiment 6 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface, 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 first lens element can have a negative optical power and the image-side surface can be concave. The image side surface of the first lens is arranged to be in a concave shape, so that the light rays with a large field of view can be collected as much as possible, and the collected light rays can smoothly enter the rear optical system. In some embodiments, the object side of the first lens may be arranged to be convex. In further embodiments, the object side surface of the first lens may also be arranged to be concave.

The second lens element can have a positive power, and can have a convex object-side surface and a concave image-side surface. The second lens is arranged as a meniscus lens with the convex surface facing the object side, and the light collected by the first lens can be compressed, so that the trend of the light is smoothly transited.

The third lens element can have a positive power, and can have a concave object-side surface and a convex image-side surface. The third lens can be used for converging light rays, so that the diverging light rays can smoothly enter the rear optical system. In addition, arranging the third lens in a meniscus shape with the concave surface facing the object side facilitates shortening of the total system optical length TTL (i.e., the on-axis distance from the center of the object side surface of the first lens to the imaging surface of the optical lens).

The fourth lens element can have a positive power, and can have a convex object-side surface and a convex image-side surface. The fifth lens element may have a negative optical power, and the object-side surface thereof may be concave. In some embodiments, the image side surface of the fifth lens may be arranged to be convex. In further embodiments, the image side surface of the fifth lens may be further arranged to be concave.

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. As known to those skilled in the art, cemented lenses are used to minimize or eliminate chromatic aberration. The use of the cemented lens can improve the image quality and reduce the reflection loss of light energy, thereby improving the definition of the image. The cemented lens consisting of the fourth lens and the fifth lens is introduced in the application, so that the chromatic aberration influence can be eliminated, and the tolerance sensitivity of the system is reduced; the fourth lens and the fifth lens which are simultaneously cemented can also leave partial chromatic aberration to balance the overall chromatic aberration of the optical system. In the cemented lens, the fourth lens close to the object side has positive focal power, and the fifth lens close to the image side has negative focal power, so that the arrangement is favorable for further converging front light rays and then transitioning the front light rays to a rear optical system, thereby reducing the aperture or size of the rear end of the lens and shortening the optical total length of the system. In addition, the use of the cemented lens can also simplify the assembly process in the lens manufacturing process.

The sixth lens element can have a positive optical power, and can have a convex object-side surface and a concave image-side surface. In some embodiments, the image side surface of the sixth lens may be concave. In other embodiments, the image-side surface of the sixth lens element may be convex in the paraxial region and concave in the paraxial region. That is, when the image side surface of the sixth lens is convex in the paraxial region, the image side surface may have at least one inflection point, so that the image side surface may have a variation tendency from convex to concave at least from the central region to the edge region. The sixth lens is a convergent lens, and light rays can smoothly pass through the sixth lens and irradiate the surface of the chip, so that the relative illumination performance of the lens is improved.

In an exemplary embodiment, a diaphragm for limiting a light beam may be disposed between the second lens and the third lens to improve the imaging quality of the lens. The diaphragm is arranged between the second lens and the third lens, so that the front and the rear light rays can be collected, the optical total length of the system is shortened, and the calibers of the front and the rear lens groups are favorably reduced. It should be understood by those skilled in the art that the stop may be disposed between any discrete lenses or between the object side and the first lens as desired, i.e., the disposition of the stop should not be limited to between the second lens and the third lens.

In an exemplary embodiment, at least one lens of the second lens, the third lens, and the sixth lens may be arranged as an aspherical lens. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved.

In addition, each of the second lens, the third lens and the sixth lens may be a lens made of plastic, or may be a lens made of glass. 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.

An on-axis distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens and a total focal length f of the optical lens can satisfy 4 ≦ TTL/f ≦ 5, and more specifically, TTL and f can further satisfy 4.58 ≦ TTL/f ≦ 4.75. The condition that TTL/f is more than or equal to 4 and less than or equal to 5 can be satisfied, and the miniaturization characteristic of the lens can be embodied.

An on-axis distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens, an image height h corresponding to the maximum field angle of the optical lens and a maximum field angle FOV of the optical lens satisfy TTL/h/FOV of not more than 0.03, and more specifically, TTL, h and FOV further satisfy 0.014 of not more than TTL/h/FOV of not more than 0.018. The condition TTL/h/FOV is less than or equal to 0.03, so that the lens has shorter total optical length TTL under the condition of the same imaging surface.

The maximum clear aperture D of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens meet that D/h/FOV is less than or equal to 0.015, more specifically, D, h and FOV further meet that D/h/FOV is less than or equal to 0.0076 and the maximum field angle of view of the optical lens is less than or equal to 0.0030. The conditional expression D/h/FOV is less than or equal to 0.015, and the small caliber of the front end of the lens can be ensured.

The lens barrel according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power and the surface type of each lens, the on-axis distance between each lens and the like, the total optical length can be shortened and the field angle can be enlarged under the condition of ensuring large imaging size and high pixel of the lens. In addition, the lens configured in the mode also has the performances of compact structure, small front port diameter and poor heat dissipation, so that the lens can better meet the vehicle-mounted requirement.

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 six lenses L1-L6 arranged in order from the object side to the image side along the optical axis. 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 positive power, with the object side S3 being convex and the image side S4 being concave; the third lens L3 is a meniscus lens with positive power, with the object side S6 being concave and the image side S7 being convex; the fourth lens L4 is a biconvex lens with positive optical power, and both the object-side surface S8 and the image-side surface S9 are convex; the fifth lens L5 is a biconcave lens with negative power, and both the object-side surface S9 and the image-side surface S10 are concave; and the sixth lens L6 is a biconvex lens with positive power, the object-side surface S11 being convex, the image-side surface S12 being convex in the paraxial region and having at least one point of inflection such that the image-side surface S12 is concave in the paraxial region. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. In the optical lens of the present embodiment, a stop STO may also be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality. Optionally, the optical lens may further include a color filter L7 having an object side S13 and an image side S14. Optionally, the optical lens may further include a protective glass L7 having an object-side surface S13 and an image-side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 1 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 1.

TABLE 1

The present embodiment adopts six lenses as an example, and by reasonably 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 realize the effects of reducing the total optical length and expanding the field angle while ensuring a large imaging size and high pixels. 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 that can be used for each of the aspherical lens surfaces S3, S4, S6, S7, S11 and S12 in example 1.

Flour mark

k

A

B

C

D

E

S3

-0.0592

3.4085E-04

3.3767E-05

-3.0699E-05

7.3822E-06

-1.2784E-06

S4

31.1184

2.7209E-03

3.8557E-04

-4.6821E-07

-6.4725E-06

3.8541E-07

S6

-231.3738

6.1070E-04

6.9742E-05

-2.2623E-06

-2.5024E-07

-6.1020E-08

S7

-0.0925

9.8758E-04

-1.5510E-04

6.2804E-06

1.6641E-06

-2.1849E-07

S11

1.9800

2.8814E-03

2.2508E-05

-2.1756E-05

1.6225E-06

-7.5239E-08

S12

-538.2304

3.7571E-03

3.7862E-04

5.6803E-06

-2.6184E-06

4.8516E-08

TABLE 2

The maximum field angle FOV of the optical lens, 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 imaging surface S15 of the optical lens), the total focal length f of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and 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 of example 1 are given in table 3 below.

Parameter(s)	FOV(°)	TTL(mm)	f(mm)	h(mm)	D(mm)
						Numerical value	125	18.93	4.11	8.73	7.63

TABLE 3

In the present embodiment, TTL/f is 4.60, which is satisfied between the total optical length TTL of the optical lens and the total 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; the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy D/h/FOV equal to 0.0070.

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 six lenses L1-L6 arranged in order from the object side to the image side along the optical axis. 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 positive power, with the object side S3 being convex and the image side S4 being concave; the third lens L3 is a meniscus lens with positive power, with the object side S6 being concave and the image side S7 being convex; the fourth lens L4 is a biconvex lens with positive optical power, and both the object-side surface S8 and the image-side surface S9 are convex; the fifth lens L5 is a biconcave lens with negative power, and both the object-side surface S9 and the image-side surface S10 are concave; and the sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. In the optical lens of the present embodiment, a stop STO may also be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality. Optionally, the optical lens may further include a color filter L7 having an object side S13 and an image side S14. Optionally, the optical lens may further include a protective glass L7 having an object-side surface S13 and an image-side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 4 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2. Table 5 shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the respective aspherical lens surfaces S3, S4, S6, S7, S11 and S12 in example 2. Table 6 shows the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, the total focal length f of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum light transmission aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens in example 2. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Flour mark	Radius of curvature R (mm)	Thickness T (mm)	Refractive index Nd	Abbe number Vd
					S1	78.9054	0.9000	1.80	46.57
S2	3.1234	2.7733
					S3	9.7708	1.0722	1.64	23.53
S4	25.1004	1.1254
					STO	Infinity	0.0228
S6	-82.3032	2.0000	1.53	56.07
					S7	-3.6617	0.1000
S8	7.3015	3.4519	1.74	44.90
					S9	-4.6333	0.6000	1.85	23.79
S10	7.1645	0.2000
					S11	7.2996	1.7620	1.53	56.07
S12	300.6688	0.9986
					S13	Infinity	0.9500	1.52	64.21
S14	Infinity	2.5744
					S15	Infinity

TABLE 4

Flour mark

k

A

B

C

D

E

S3

1.0357

5.1841E-04

9.4541E-05

-4.6398E-05

6.2723E-06

-1.0096E-06

S4

58.5419

3.3607E-03

5.7682E-04

-2.2905E-05

-9.9963E-06

1.4210E-06

S6

-200.0000

1.0571E-03

2.4193E-05

-1.2127E-05

-1.3652E-07

1.0255E-08

S7

-0.1119

1.2856E-03

-2.2008E-04

8.2797E-06

1.7510E-06

-2.7870E-07

S11

1.4463

3.2527E-03

-1.1257E-04

-2.8223E-05

2.4198E-06

-1.4997E-07

S12

-1000.0000

6.4665E-03

1.4699E-04

-3.5589E-06

-3.3995E-06

1.3665E-07

TABLE 5

Parameter(s)	FOV(°)	TTL(mm)	f(mm)	h(mm)	D(mm)
						Numerical value	125	18.53	3.90	8.44	7.98

TABLE 6

In the present embodiment, TTL/f is 4.75, which is satisfied between the total optical length TTL of the optical lens and the total 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; the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy D/h/FOV of 0.0076.

Example 3

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

As shown in fig. 3, the optical lens includes six lenses L1-L6 arranged in order from the object side to the image side along the optical axis. 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 positive power, with the object side S3 being convex and the image side S4 being concave; the third lens L3 is a meniscus lens with positive power, with the object side S6 being concave and the image side S7 being convex; the fourth lens L4 is a biconvex lens with positive optical power, and both the object-side surface S8 and the image-side surface S9 are convex; 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; and the sixth lens L6 is a biconvex lens with positive power, the object-side surface S11 being convex, the image-side surface S12 being convex in the paraxial region and having at least one point of inflection such that the image-side surface S12 is concave in the paraxial region. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. In the optical lens of the present embodiment, a stop STO may also be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality. Optionally, the optical lens may further include a color filter L7 having an object side S13 and an image side S14. Optionally, the optical lens may further include a protective glass L7 having an object-side surface S13 and an image-side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 7 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3. Table 8 shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the respective aspherical lens surfaces S3, S4, S6, S7, S11 and S12 in example 3. Table 9 shows the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, the total focal length f of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum light transmission aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens in example 3. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Flour mark	Radius of curvature R (mm)	Thickness T (mm)	Refractive index Nd	Abbe number Vd
					S1	500.0000	0.9000	1.80	46.57
S2	2.6597	1.8369
					S3	7.8275	1.4160	1.64	23.53
S4	23.2772	0.6761
					STO	Infinity	-0.0558
S6	-161.2433	2.0000	1.53	56.07
					S7	-3.4205	0.1000
S8	10.6624	3.9667	1.74	44.90
					S9	-3.4391	0.6000	1.85	23.79
S10	-480.0001	0.2000
					S11	21.3726	1.9310	1.53	56.07
S12	-959.9404	0.9986
					S13	Infinity	0.9500	1.52	64.21
S14	Infinity	2.9002
					S15	Infinity

TABLE 7

Flour mark

k

A

B

C

D

E

S3

1.3887

8.5020E-04

3.7035E-05

-5.3197E-05

1.4941E-05

-3.3786E-06

S4

90.1738

4.2246E-03

8.6116E-04

-3.2168E-05

-1.8442E-05

3.3551E-07

S6

-1000.0000

2.3117E-03

2.3224E-04

-7.0812E-06

-3.5275E-06

-6.5883E-08

S7

-0.0875

1.3784E-03

-3.2071E-04

1.8130E-05

4.0844E-06

-6.7960E-07

S11

11.8833

3.6805E-03

-1.0414E-05

-2.8057E-05

2.0929E-06

-9.2039E-08

S12

-1000.0000

6.2796E-03

5.8998E-05

2.4398E-06

-2.1713E-06

6.7789E-08

TABLE 8

Parameter(s)	FOV(°)	TTL(mm)	f(mm)	h(mm)	D(mm)
						Numerical value	125	18.42	4.03	8.54	7.02

TABLE 9

In the present embodiment, TTL/f is 4.58 between the total optical length TTL of the optical lens and the total 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; the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy D/h/FOV equal to 0.0066.

Example 4

An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.

As shown in fig. 4, the optical lens includes six lenses L1-L6 arranged in order from the object side to the image side along the optical axis. 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 positive power, with the object side S3 being convex and the image side S4 being concave; the third lens L3 is a meniscus lens with positive power, with the object side S6 being concave and the image side S7 being convex; the fourth lens L4 is a biconvex lens with positive optical power, and both the object-side surface S8 and the image-side surface S9 are convex; 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; and the sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. In the optical lens of the present embodiment, a stop STO may also be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality. Optionally, the optical lens may further include a color filter L7 having an object side S13 and an image side S14. Optionally, the optical lens may further include a protective glass L7 having an object-side surface S13 and an image-side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 10 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4. Table 11 shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the respective aspherical lens surfaces S3, S4, S6, S7, S11 and S12 in example 4. Table 12 shows the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, the total focal length f of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum light transmission aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens in example 4. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Watch 10

Flour mark

k

A

B

C

D

E

S3

1.2555

9.9113E-04

6.1738E-05

-6.5583E-05

1.4021E-05

-2.9294E-06

S4

92.5507

4.7536E-03

9.6833E-04

-6.8612E-05

-1.8173E-05

1.1284E-06

S6

-1000.1910

2.8656E-03

1.9807E-04

-1.7146E-05

-2.3755E-06

-8.4669E-08

S7

-0.0884

1.5012E-03

-3.1761E-04

1.6425E-05

4.3260E-06

-6.7576E-07

S11

4.6313

3.8547E-03

-7.9544E-05

-2.6463E-05

2.0900E-06

-9.8241E-08

S12

-558.4153

7.6673E-03

-3.6975E-05

-5.0476E-07

-2.2853E-06

9.2903E-08

TABLE 11

Parameter(s)	FOV(°)	TTL(mm)	f(mm)	h(mm)	D(mm)
						Numerical value	125	18.19	3.96	8.37	7.04

TABLE 12

In the present embodiment, TTL/f is 4.59, which is satisfied between the total optical length TTL of the optical lens and the total 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; the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy D/h/FOV of 0.0067.

Example 5

An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 shows a schematic structural diagram of an optical lens according to embodiment 5 of the present application.

As shown in fig. 5, the optical lens includes six lenses L1-L6 arranged in order from the object side to the image side along the optical axis. The first lens L1 is a biconcave lens with negative power, and both the object-side surface S1 and the image-side surface S2 are concave; the second lens L2 is a meniscus lens with positive power, with the object side S3 being convex and the image side S4 being concave; the third lens L3 is a meniscus lens with positive power, with the object side S6 being concave and the image side S7 being convex; the fourth lens L4 is a biconvex lens with positive optical power, and both the object-side surface S8 and the image-side surface S9 are convex; the fifth lens L5 is a biconcave lens with negative power, and both the object-side surface S9 and the image-side surface S10 are concave; and the sixth lens L6 is a biconvex lens with positive optical power, the object-side surface S11 of which is convex, the image-side surface S12 of which is convex in the paraxial region and has at least one point of inflexion, such that the image-side surface S12 is concave in the paraxial region. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. In the optical lens of the present embodiment, a stop STO may also be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality. Optionally, the optical lens may further include a color filter L7 having an object side S13 and an image side S14. Optionally, the optical lens may further include a protective glass L7 having an object-side surface S13 and an image-side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 13 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5. Table 14 shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the respective aspherical lens surfaces S3, S4, S6, S7, S11 and S12 in example 5. Table 15 shows the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, the total focal length f of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum light transmission aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens in example 5. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Watch 13

Flour mark

k

A

B

C

D

E

S3

1.0935

6.1095E-04

1.4601E-04

-7.0875E-05

9.7920E-06

-7.1672E-07

S4

33.3350

3.6683E-03

2.7685E-04

-6.7036E-05

4.1997E-06

-4.0361E-07

S6

-14529.6700

3.2464E-03

-5.0714E-05

-1.8066E-05

4.2759E-06

-3.5534E-07

S7

-0.3059

2.3221E-03

-2.5254E-04

2.7419E-05

4.0084E-07

-1.6605E-07

S11

1.7632

4.5289E-03

-1.1203E-04

-6.4561E-05

7.0102E-06

-3.6129E-07

S12

-24798.1900

6.4986E-03

3.4694E-04

-9.0673E-06

-5.2175E-06

2.5757E-07

TABLE 14

Parameter(s)	FOV(°)	TTL(mm)	f(mm)	h(mm)	D(mm)
						Numerical value	136	19.00	4.11	9.93	4.12

Watch 15

In the present embodiment, TTL/f is 4.62 between the total optical length TTL of the optical lens and the total 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 0.014; D/h/FOV is 0.0030 between 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, the image height h corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens.

Example 6

An optical lens according to embodiment 6 of the present application is described below with reference to fig. 6. Fig. 6 shows a schematic structural diagram of an optical lens according to embodiment 6 of the present application.

As shown in fig. 6, the optical lens includes six lenses L1-L6 arranged in order from the object side to the image side along the optical axis. The first lens L1 is a biconcave lens with negative power, and both the object-side surface S1 and the image-side surface S2 are concave; the second lens L2 is a meniscus lens with positive power, with the object side S3 being convex and the image side S4 being concave; the third lens L3 is a meniscus lens with positive power, with the object side S6 being concave and the image side S7 being convex; the fourth lens L4 is a biconvex lens with positive optical power, and both the object-side surface S8 and the image-side surface S9 are convex; the fifth lens L5 is a biconcave lens with negative power, and both the object-side surface S9 and the image-side surface S10 are concave; and the sixth lens L6 is a meniscus lens with positive power, with the object side S11 being convex and the image side S12 being concave. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. In the optical lens of the present embodiment, a stop STO may also be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality. Optionally, the optical lens may further include a color filter L7 having an object side S13 and an image side S14. Optionally, the optical lens may further include a protective glass L7 having an object-side surface S13 and an image-side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 16 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 6. Table 17 shows the conic coefficients k and high-order term coefficients A, B, C, D and E that can be used for the respective aspherical lens surfaces S3, S4, S6, S7, S11 and S12 in example 6. Table 18 shows the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, the total focal length f of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum light transmission aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens in example 6. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Flour mark	Radius of curvature R (mm)	Thickness T (mm)	Refractive index Nd	Abbe number Vd
					S1	-200.0000	0.9000	1.80	46.57
S2	3.1744	1.9109
					S3	8.7029	2.3031	1.64	23.53
S4	23.3775	1.5151
					STO	Infinity	-0.1187
S6	-250.0000	1.4738	1.53	56.07
					S7	-3.8221	0.1000
S8	6.7717	3.1594	1.74	44.90
					S9	-5.4141	0.6000	1.85	23.79
S10	7.7514	0.1000
					S11	8.2856	2.4992	1.53	56.07
S12	200.0000	0.9986
					S13	Infinity	0.9500	1.52	64.21
S14	Infinity	2.6097
					S15	Infinity

TABLE 16

TABLE 17

Parameter(s)	FOV(°)	TTL(mm)	f(mm)	h(mm)	D(mm)
						Numerical value	136	19.00	4.10	9.94	8.28

Watch 18

In the present embodiment, TTL/f is 4.63, which is satisfied between the total optical length TTL of the optical lens and the total 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 0.014; the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens, the image height h corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy D/h/FOV equal to 0.0061.

In summary, examples 1 to 6 each satisfy the relationship shown in table 19 below.

Conditional expression (A) example	1	2	3	4	5	6
							TTL/f	4.60	4.75	4.58	4.59	4.62	4.63
TTL/h/FOV	0.017	0.018	0.017	0.017	0.014	0.014
							D/h/FOV	0.0070	0.0076	0.0066	0.0067	0.0030	0.0061

Watch 19

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 (25)

1. An optical lens includes six lenses having optical powers, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens to the sixth lens are arranged in order from an object side to an image side along an optical axis,

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

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

the second lens has positive 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 positive 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 sixth lens each have a positive optical power;

the fifth lens has a negative optical power; and

(D×180°)/(h×FOV)≤1.368，

wherein the FOV is a maximum field angle of the optical lens in degrees;

d is the maximum light-passing aperture of the object side surface of the first lens corresponding to the maximum field angle; and

h is the image height corresponding to the maximum field angle of the optical lens.

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 concave.

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

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.

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

and the object side surface and the image side surface of the fifth lens are both concave surfaces.

6. An optical lens according to claim 4, wherein the fourth lens and the fifth lens are cemented to form a cemented lens.

7. An optical lens according to claim 5, wherein the fourth lens and the fifth lens are cemented to form a cemented lens.

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

9. An optical lens barrel according to claim 8, wherein the image side surface of the sixth lens element is convex at the paraxial region and has at least one inflection point.

10. An optical lens barrel according to claim 8, wherein the image side surface of the sixth lens element is concave.

11. An optical lens barrel according to any one of claims 1 to 10, wherein at least one of the second lens, the third lens and the sixth lens is an aspherical lens.

12. An optical lens barrel according to any one of claims 1 to 10, having a total focal length f, wherein an on-axis distance TTL from a center of an object side surface of the first lens to an imaging plane of the optical lens and the total focal length f satisfy 4 ≦ TTL/f ≦ 5.

13. An optical lens according to any one of claims 1 to 10, wherein (TTL x 180 °)/(hxFOV) is ≦ 5.4,

wherein, TTL is the axial distance from the center of the object side surface of the first lens to the imaging surface of the optical lens;

h is the image height corresponding to the maximum field angle; and

the FOV is the maximum field angle of the optical lens in degrees.

14. An optical lens having a total focal length f, the optical lens having six lenses with focal power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens to the sixth lens are arranged in order from an object side to an image side along an optical axis,

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

the first lens and the fifth lens each have a negative optical power;

the second lens, the fourth lens and the sixth lens each have a positive optical power;

the third lens has positive 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 on-axis distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens and the total focal length f meet the condition that TTL/f is more than or equal to 4 and less than or equal to 5; and

(D×180°)/(h×FOV)≤1.368，

wherein the FOV is a maximum field angle of the optical lens in degrees;

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.

15. An optical lens barrel according to claim 14, wherein the first lens element has a concave image-side surface and a convex object-side surface.

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

17. An optical lens barrel according to claim 15 or 16, wherein the object side surface of the second lens element is convex and the image side surface is concave.

18. An optical lens barrel according to claim 17, wherein the object-side surface and the image-side surface of the fourth lens are convex;

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.

19. An optical lens barrel according to claim 17, wherein the object-side surface and the image-side surface of the fourth lens are convex;

and the object side surface and the image side surface of the fifth lens are both concave surfaces.

20. An optical lens according to claim 18 or 19, characterized in that the fourth lens and the fifth lens are cemented to constitute a cemented lens.

21. An optical lens barrel according to claim 20, wherein the object side surface of the sixth lens element is convex.

22. An optical lens barrel according to claim 21, wherein the image side surface of the sixth lens element is convex at the paraxial region and has at least one inflection point.

23. An optical lens barrel according to claim 21, wherein the image side surface of the sixth lens element is concave.

24. An optical lens barrel according to claim 14, wherein at least one of the second lens, the third lens and the sixth lens is an aspherical lens.

25. An optical lens as claimed in claim 22 or 23, characterized in that (TTL x 180 °)/(hxFOV) ≦ 5.4,

wherein, TTL is the axial distance from the center of the object side surface of the first lens to the imaging surface of the optical lens;

h is the image height corresponding to the maximum field angle; and

the FOV is the maximum field angle of the optical lens in degrees.

Images