CN110488471B

CN110488471B - Optical lens

Info

Publication number: CN110488471B
Application number: CN201810454012.XA
Authority: CN
Inventors: 王东方; 李慧敏; 姚波
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2018-05-14
Filing date: 2018-05-14
Publication date: 2021-10-22
Anticipated expiration: 2038-05-14
Also published as: CN110488471A

Abstract

The application discloses an optical lens, include in order from object side to image side along an optical axis: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, and is characterized in that the first lens is a meniscus lens with 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 is a meniscus lens with negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens is a meniscus lens with positive focal power, and 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 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface. The optical lens has the characteristics of low cost, high pixel, preferably more than 2M, and good temperature performance.

Description

Optical lens

Technical Field

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

Background

At present, in the field of vehicle-mounted wide-angle lenses, on the premise of ensuring low cost and high performance, the imaging performance of the lens at different temperatures is concerned more and more, and the imaging performance of the lens can still keep high definition within different temperature variation ranges.

The prior art wide-angle lens, which is generally composed of 5-8 glass lenses, has the disadvantages of heavy weight, high cost, and distortion over 90 ° in the field of view, and the subsequent distortion becomes more serious. Some wide-angle lenses in the prior art may consist of 4 glass lenses and 2 plastic lenses, which are expensive and do not satisfy the consumer's low-cost and high-performance requirements for lenses. Some lenses in the prior art can also be composed of 2 glass lenses and 3 plastic lenses, and since the plastic lenses are seriously deformed when being subjected to high and low temperatures, the back focal offset of the 3 plastic lenses at the high and low temperatures is difficult to be counteracted by themselves, so that the imaging quality of the lens is seriously reduced along with the change of the environmental temperature.

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.

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 optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens is a meniscus lens with 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 is a meniscus lens with negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens is a meniscus lens with positive focal power, and 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 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens and the sixth lens are mutually glued.

In one embodiment, the fifth lens element is a meniscus lens element with negative power and has a convex object-side surface and a concave image-side surface.

In one embodiment, the sixth lens element has positive optical power, and the object-side surface of the sixth lens element is convex and the image-side surface of the sixth lens element is convex.

In one embodiment, at least two of the first to sixth lenses are glass lenses.

In one embodiment, the refractive index Nd1 ≧ 1.65 of the first lens material.

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 of less than or equal to 0.025.

In one embodiment, the opening angle of the cemented surface S11 of the fifth lens and the sixth lens satisfies arctan (SAG (S11)/d (S11)) > or more than 40.

In one embodiment, the radius of curvature R5 of the object side surface of the third lens, the center thickness d5 of the third lens and the radius of curvature R6 of the image side surface of the third lens are equal to or less than 1.2 (R5-d5)/R6 is equal to or less than 1.8.

In one embodiment, the third lens is made of a plastic material.

In one embodiment, F3/F ≧ 13 is satisfied between the total focal length F of the optical lens and the focal length F3 of the third lens. In one embodiment, the total focal length F of the optical lens and the focal length F6 of the sixth lens satisfy 0.55 ≦ F6/F ≦ 1.55.

In one embodiment, 0.5 ≦ F6/F5 ≦ 1.5 is satisfied between the focal length F5 of the fifth lens and the focal length F6 of the sixth lens.

In one embodiment, a focal length F23 of the second and third lens groups and a focal length F56 of the fifth and sixth lens groups satisfy-2 ≦ -F23/F56 ≦ -0.4.

In one embodiment, BFL/TTL is more than or equal to 0.1 between optical back focus BFL of the optical lens and optical length TTL of the optical lens.

In one embodiment, the optical lens has a back focus offset of 0.02mm or less in a temperature range of-40 ℃ to 105 ℃.

In one embodiment, a stop is disposed between the fourth lens and the fifth lens.

An 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 optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens is a meniscus lens with 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 is a meniscus lens with negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens is a meniscus lens with positive focal power, and 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 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the total focal length F of the optical lens and the focal length F6 of the sixth lens meet the condition that F6/F is more than or equal to 0.55 and less than or equal to 1.55.

In one embodiment, at least two of the first to sixth lenses are glass lenses.

In one embodiment, the third lens is made of a plastic material.

In one embodiment, F3/F ≧ 13 is satisfied between the total focal length F of the optical lens and the focal length F3 of the third lens.

In one embodiment, the fifth lens and the sixth lens are cemented to each other.

The optical lens provided by the invention has the characteristics of low cost, high pixel, preferably more than 2M, and good temperature performance.

Drawings

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

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

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

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

fig. 4 shows a SAG representation of a lens mirror, which schematically shows a calculation method of SAG of the lens mirror.

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 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).

In an exemplary embodiment, the first lens may be a meniscus lens with a negative power, and the object side surface is convex and the image side surface is concave. The first lens is in a meniscus shape convex to the object side, can collect light rays with a large field of view as far as possible, and enables the collected light rays to enter a rear optical system. In practical application, the outdoor installation and use environment of the vehicle-mounted lens is considered, namely the vehicle-mounted lens can be in severe weather such as rain, snow and the like, the first lens is designed into a meniscus shape, so that water drops can slide down, and the influence of the water drops on the lens on lens imaging is reduced. In the embodiments of the present application, the first lens may be made of glass, have characteristics of scratch resistance, wear resistance, corrosion resistance, and the like, and also contribute to maintaining the temperature stability of the lens barrel. Furthermore, the first lens is a glass aspheric lens, so that the imaging quality can be further improved, and the caliber of the front end can be reduced. In the embodiment of the application, the first lens can be made of high refractive index material, which is beneficial to reduce the front end aperture and improve the imaging quality, for example, the refractive index Nd1 ≧ 1.65 of the first lens.

In an exemplary embodiment, the second lens may be a meniscus lens with a negative power and a convex object-side surface and a concave image-side surface. The second lens can compress the light collected by the first lens and enable the light to smoothly transit to the rear optical system. The image side surface of the second lens is a concave surface, which is beneficial to reducing the distance between the first lens and the second lens, thereby shortening the physical total length of the lens and realizing the miniaturization of the lens.

In an exemplary embodiment, the third lens may be a meniscus lens with positive power and a concave object-side surface and a convex image-side surface. The third lens can converge the light, so that the diffused light can smoothly enter the rear optical system, and the spherical aberration and the position chromatic aberration introduced by the front two lenses can be balanced. The particular shape of the third lens is advantageous for reducing the overall length of the optical system. In the embodiment of the application, the third lens can be made of a plastic material, and has a special focal length limitation, which is beneficial to ensuring the imaging quality of the whole optical system at high and low temperatures. In another embodiment, the third lens may also be made of a glass material, which is not limited in this application.

In an exemplary embodiment, the fourth lens element may have a positive optical power, and the object-side surface thereof is convex and the image-side surface thereof is convex. The fourth lens can converge the light, so that the front-end light is converged to the rear optical system quickly.

In an exemplary embodiment, the fifth lens may be a meniscus lens with a negative power, and the object side surface is convex and the image side surface is concave.

In an exemplary embodiment, the sixth lens element may have positive optical power, and the object-side surface thereof is convex and the image-side surface thereof is convex.

In an exemplary embodiment, the fifth lens is cemented with the sixth lens, which is advantageous for reducing tolerance sensitivity. The fifth lens with negative focal power is arranged in front of the fifth lens, the sixth lens with positive focal power is arranged behind the fifth lens, the light rays converged by the fourth lens at the front end can be diverged and transited firstly, and then the sixth lens with positive focal power is used for further correcting aberration and converging the light rays to an imaging surface. In the embodiment of the application, the opening angle of the bonding surface can be increased, which is beneficial to the quick focusing of peripheral light rays and improves the imaging quality.

In an exemplary embodiment, the refractive index Nd1 ≧ 1.65 of the first lens material. More specifically, Nd1 ≧ 1.7 is satisfied. The refractive index of the first lens material meets Nd1 being more than or equal to 1.65, which is beneficial to reducing the front end caliber and improving the imaging quality.

In an exemplary embodiment, D/h/FOV is less than or equal to 0.025 between 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. More specifically, D/h/FOV ≦ 0.02 is satisfied. The front port diameter of the optical lens can be smaller by satisfying that D/h/FOV is less than or equal to 0.025.

In an exemplary embodiment, the opening angle of the cemented surface S11 of the fifth lens and the sixth lens satisfies arctan (SAG (S11)/d (S11)) > or more than 40. More specifically, 40. ltoreq. arctan (SAG (S11)/d (S11)). ltoreq.70 is satisfied. By satisfying arctan (SAG (S11)/d (S11)) > 40, the opening angle of the gluing surface S11 of the fifth lens and the sixth lens is larger, which is beneficial to quickly focusing peripheral light rays and improving the imaging quality.

In an exemplary embodiment, a radius of curvature R5 of the object-side surface of the third lens, a center thickness d5 of the third lens, and a radius of curvature R6 of the image-side surface of the third lens satisfy 1.2 ≦ (R5-d5)/R6 ≦ 1.8. More specifically, 1.3. ltoreq. (R5-d 5)/R6. ltoreq.1.7 is satisfied. The third lens is in a special shape arrangement by meeting the requirement that (R5-d5)/R6 is more than or equal to 1.2 and less than or equal to 1.8, so that the imaging quality is improved, and the total length of the lens is shortened.

In an exemplary embodiment, the third lens is made of a plastic material.

In an exemplary embodiment, F3/F ≧ 13 is satisfied between the total focal length F of the optical lens and the focal length F3 of the third lens. More specifically, F3/F.gtoreq.15 is satisfied. By satisfying F3/F ≧ 13, the third lens can be set to have a special focal length, so that imaging through the optical lens is always on a better imaging surface under high and low temperature conditions.

In an exemplary embodiment, the third lens is made of a glass material.

In an exemplary embodiment, 0.55 ≦ F6/F ≦ 1.55 between the total focal length F of the optical lens and the focal length F6 of the sixth lens. More specifically, 0.75. ltoreq. F6/F. ltoreq.1.35 is satisfied. Through special focal length control of the sixth lens, F6/F is more than or equal to 0.55 and less than or equal to 1.55, so that the lens can always be positioned on a better imaging surface through imaging of the optical lens under high and low temperature conditions.

In an exemplary embodiment, 0.5 ≦ F6/F5 ≦ 1.5 between the focal length F5 of the fifth lens and the focal length F6 of the sixth lens. More specifically, 0.7. ltoreq. F6/F5. ltoreq.1.3 is satisfied. Through the matching of the special focal lengths of the fifth lens and the sixth lens, the requirement that the absolute value of F6/F5 is more than or equal to 0.5 and less than or equal to 1.5 is met, and the lens capable of always keeping the ultra-wide working temperature of a clear image plane can be provided.

In an exemplary embodiment, a focal length F23 of the second and third lens groups and a focal length F56 of the fifth and sixth lens groups satisfy-2 ≦ -F23/F56 ≦ -0.4. More specifically, it satisfies-1.5. ltoreq. F23/F56. ltoreq. F0.9.

In an exemplary embodiment, BFL/TTL ≧ 0.1 is satisfied between an optical back focus BFL of the optical lens and an optical length TTL of the optical lens. More specifically, BFL/TTL ≧ 0.12 is satisfied. The BFL/TTL is more than or equal to 0.1, the lens assembly is facilitated, and therefore the integral framework of the lens is realized.

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 element L1 can be a meniscus lens element with negative power, and has a convex object-side surface and a concave image-side surface.

The second lens element L2 can be a meniscus lens element with negative power, and has a convex object-side surface and a concave image-side surface. The second lens L2 is an aspherical lens, and both the object-side surface and the image-side surface thereof are aspherical.

The third lens element L3 can be a meniscus lens element with positive power, and has a concave object-side surface and a convex image-side surface. The third lens L3 is an aspherical lens, and both the object-side surface and the image-side surface thereof are aspherical.

The fourth lens element L4 may have positive power and a convex object-side surface and a convex image-side surface.

The fifth lens element L5 can be a meniscus lens element with negative power, and has a convex object-side surface and a concave image-side surface. The fifth lens L5 is an aspherical lens, and both the object-side surface and the image-side surface thereof are aspherical surfaces.

The sixth lens element L6 may have positive power and a convex object-side surface and a convex image-side surface. The sixth lens element L6 is an aspherical lens, and both the object-side surface and the image-side surface thereof are aspherical.

Optionally, the optical lens may further include a filter and/or a protective lens L7 having an object side S13 and an image side S14. Filters may be used to correct for color deviations. The protective lens may be used to protect an image sensing chip located at the imaging plane IMA. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the optical lens of the present embodiment, a stop STO may be provided between the fourth lens L4 and the fifth lens L5 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

Each aspherical surface type Z is defined by the following formula:

wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient conc; A. b, C, D, E are all high order term coefficients. Table 2 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S10, S11, and S12 in example 1.

TABLE 2

Flour mark

K

A

B

C

D

E

3

-120.0000

3.8724E-03

-2.5452E-04

1.5448E-05

-3.2075E-07

4.3704E-09

4

-1.7188

2.1801E-02

1.4737E-03

1.6804E-04

-6.0210E-05

4.0554E-05

5

2.2417

-1.0372E-02

1.4871E-03

-6.9379E-04

-2.7887E-04

8.4105E-05

6

9.4164

-5.7090E-03

-9.0007E-05

-4.7593E-05

5.6603E-06

2.9425E-06

10

-80.7555

-1.5698E-02

9.1650E-03

-9.6368E-03

4.8258E-03

-9.2923E-04

11

-2.1912

3.8756E-03

1.1562E-02

-6.7761E-03

1.6907E-03

-1.6768E-04

12

-5.8113

-2.8054E-02

6.7879E-03

-1.2481E-03

6.5193E-05

6.0649E-06

Table 3 below shows a refractive index Nd1 of the first lens material of the optical lens of example 1, a maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, an image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, a curvature radius R5 of the object-side surface of the third lens of the optical lens, a center thickness D5 of the third lens of the optical lens, a curvature radius R6 of the image-side surface of the third lens of the optical lens, a total focal length F of the optical lens, a focal length F3 of the third lens, a focal length F5 of the fifth lens, a focal length F6 of the sixth lens, a focal length F23 of the second and third lens groups, a focal length F56 of the fifth and sixth lens groups, an optical back focus BFL of the optical lens (i.e., a distance from the center of the image-side surface of the last lens to the image-forming surface of the optical lens), an optical length TTL of the optical lens (i.e., a distance from the center of the object-side of the first lens to the image-forming surface of the optical lens) and a focal surface of the fifth lens Opening angle arctan of S11 (SAG (S11)/d (S11)).

TABLE 3

In the present embodiment, the refractive index Nd1 of the first lens material is 1.800; 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 the condition that D/h/FOV is 0.012; the curvature radius R5 of the object side surface of the third lens of the optical lens, the center thickness d5 of the third lens of the optical lens and the curvature radius R6 of the image side surface of the third lens of the optical lens meet (R5-d5)/R6 is 1.557; F3/F is 17.011 between the total focal length F of the optical lens and the focal length F3 of the third lens; F6/F is 1.061 between the total focal length F of the optical lens and the focal length F6 of the sixth lens; a focal length F5 of the fifth lens and a focal length F6 of the sixth lens satisfy | F6/F5| -1.138; F23/F56 is-0.943 between the focal length F23 of the second lens group and the third lens group and the focal length F56 of the fifth lens group and the sixth lens group; the optical back focus BFL of the optical lens and the optical length TTL of the optical lens meet the condition that BFL/TTL is 0.171.

In this embodiment, the opening angle of the cemented surface S11 of the fifth lens and the sixth lens satisfies arctan (SAG (S11)/d (S11)) -44.500 °, where d (S11) is the half aperture of the maximum clear aperture of the cemented surface S11 corresponding to the maximum field angle of the optical lens, and SAG is the Sg value corresponding to the cemented surface S11 (SAG is calculated as shown in fig. 4).

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 the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S10, S11, and S12 in example 2. Table 6 below shows a refractive index Nd1 of the first lens material of the optical lens of example 2, a maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, an image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, a curvature radius R5 of the object-side surface of the third lens of the optical lens, a center thickness D5 of the third lens of the optical lens, a curvature radius R6 of the image-side surface of the third lens of the optical lens, a total focal length F of the optical lens, a focal length F3 of the third lens, a focal length F5 of the fifth lens, a focal length F6 of the sixth lens, a focal length F23 of the second and third lens groups, a focal length F56 of the fifth and sixth lens groups, an optical back focus BFL of the optical lens (i.e., a distance from the center of the image-side surface of the last lens to the image-forming surface of the optical lens), an optical length TTL of the optical lens (i.e., a distance from the center of the object-side of the first lens to the image-forming surface of the optical lens) and a focal surface of the fifth lens Opening angle arctan of S11 (SAG (S11)/d (S11)).

TABLE 4

Number of noodle S	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	13.1440	0.9500	1.73	45.00
2	3.9359	1.7399
					3	82.8539	0.6944	1.49	57.00
4	2.2552	2.2917
					5	-3.8002	1.6689	1.51	63.00
6	-3.5137	0.1000
					7	7.6991	1.9371	1.85	23.80
8	-7.6991	-0.0677
					STO	Infinity	0.5048
10	9.1155	0.9990	1.66	23.50
					11	0.8667	2.8718	1.54	40.00
12	-2.6255	0.1799
					13	Infinity	0.9500	1.52	64.20
14	Infinity	1.7276
					IMA	Infinity

TABLE 5

Number of noodle S

K

A

B

C

D

E

3

-80.0000

3.8508E-03

-2.5528E-04

1.5407E-05

-3.2604E-07

3.5702E-09

4

-3.7133

2.1904E-02

1.4693E-03

1.6785E-04

-5.9162E-05

4.1304E-05

5

2.2490

-1.0564E-02

1.4426E-03

-6.8587E-04

-2.6395E-04

8.6381E-05

6

0.4017

-5.6062E-03

-1.1272E-04

-5.4620E-05

7.3576E-06

4.2234E-06

10

-79.6911

-5.6780E-03

9.1369E-03

-9.6873E-03

4.8078E-03

-8.8774E-04

11

-3.0905

3.8453E-03

1.1629E-02

-6.7247E-03

1.7047E-03

-1.7471E-04

12

-5.5359

-2.8256E-02

6.7709E-03

-1.2500E-03

6.3500E-05

6.0190E-06

TABLE 6

In the present embodiment, the refractive index Nd1 of the first lens material is 1.730; 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 the condition that D/h/FOV is 0.013; the curvature radius R5 of the object side surface of the third lens of the optical lens, the center thickness d5 of the third lens of the optical lens and the curvature radius R6 of the image side surface of the third lens of the optical lens meet (R5-d5)/R6 is 1.557; F3/F19.297 is satisfied between the total focal length F of the optical lens and the focal length F3 of the third lens; F6/F is 1.058 between the total focal length F of the optical lens and the focal length F6 of the sixth lens; a focal length F5 of the fifth lens and a focal length F6 of the sixth lens satisfy | F6/F5| -1.124; F23/F56 is-1.193 between the focal length F23 of the second and third lens groups and the focal length F56 of the fifth and sixth lens groups; the optical back focus BFL of the optical lens and the optical length TTL of the optical lens meet the condition that BFL/TTL is 0.173.

In this embodiment, the opening angle of the cemented surface S11 of the fifth lens and the sixth lens satisfies arctan (SAG (S11)/d (S11)) -52.900 °, where d (S11) is the half aperture of the maximum clear aperture of the cemented surface S11 corresponding to the maximum field angle of the optical lens, and SAG is the Sg value corresponding to the cemented surface S11 (SAG is calculated as shown in fig. 4).

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 the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S5, S6, S10, S11, and S12 in example 3. Table 9 below shows a refractive index Nd1 of the first lens material of the optical lens of example 3, a maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, an image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, a curvature radius R5 of the object-side surface of the third lens of the optical lens, a center thickness D5 of the third lens of the optical lens, a curvature radius R6 of the image-side surface of the third lens of the optical lens, a total focal length F of the optical lens, a focal length F3 of the third lens, a focal length F5 of the fifth lens, a focal length F6 of the sixth lens, a focal length F23 of the second and third lens groups, a focal length F56 of the fifth and sixth lens groups, an optical back focus BFL of the optical lens (i.e., a distance from the center of the image-side surface of the last lens to the image-forming surface of the optical lens), an optical length TTL of the optical lens (i.e., a distance from the center of the object-side of the first lens to the image-forming surface of the optical lens) and a distance of the fifth lens to the sixth lens) and optical lens Opening angle arctan of the face S11 (SAG (S11)/d (S11)).

TABLE 7

Number of noodle S	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	13.1348	0.9400	1.78	42.60
2	3.9474	1.9538
					3	54.0563	0.7306	1.55	57.00
4	2.3118	2.2732
					5	-3.7921	1.6649	1.51	46.10
6	-3.5049	0.1000
					7	7.6964	1.8631	1.76	35.80
8	-7.6964	-0.0677
					STO	Infinity	0.5164
10	9.2828	1.0194	1.67	23.50
					11	0.8651	2.8814	1.54	46.10
12	-2.6960	0.1799
					13	Infinity	0.9500	1.52	64.20
14	Infinity	2.6492
					IMA	Infinity

TABLE 8

Number of noodle S

K

A

B

C

D

E

3

-59.3456

3.8730E-03

-2.5449E-04

1.5451E-05

-3.2084E-07

4.2701E-09

4

-1.7241

2.1789E-02

1.4786E-03

1.6982E-04

-6.0028E-05

4.0456E-05

5

2.2402

-1.0355E-02

1.4917E-03

-6.9330E-04

-2.7900E-04

8.3980E-05

6

0.4171

-5.7151E-03

-8.9838E-05

-4.7284E-05

5.8009E-06

3.0272E-06

10

-80.3005

-1.5705E-02

9.1465E-03

-9.6446E-03

4.8284E-03

-9.2134E-04

11

-2.4934

3.8958E-03

1.1601E-02

-6.7683E-03

1.6889E-03

-1.6994E-04

12

-4.8435

-2.8049E-02

6.7829E-03

-1.2490E-03

6.5363E-05

6.2432E-06

TABLE 9

In the present embodiment, the refractive index Nd1 of the first lens material is 1.780; the maximum light-passing caliber 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 the condition that D/h/FOV is 0.013; the curvature radius R5 of the object side surface of the third lens of the optical lens, the center thickness d5 of the third lens of the optical lens and the curvature radius R6 of the image side surface of the third lens of the optical lens meet (R5-d5)/R6 is 1.557; F3/F18.405 is satisfied between the total focal length F of the optical lens and the focal length F3 of the third lens; F6/F is 1.014 between the total focal length F of the optical lens and the focal length F6 of the sixth lens; a focal length F5 of the fifth lens and a focal length F6 of the sixth lens satisfy | F6/F5| -1.143; F23/F56 is-1.001 between the focal length F23 of the second lens group and the focal length F56 of the third lens group and the focal length F56 of the fifth lens group and the sixth lens group; the optical back focus BFL of the optical lens and the optical length TTL of the optical lens meet the condition that BFL/TTL is 0.214.

In this embodiment, the opening angle of the cemented surface S11 of the fifth lens and the sixth lens satisfies arctan (SAG (S11)/d (S11)) -52.500 °, where d (S11) is the half aperture of the maximum clear aperture of the cemented surface S11 corresponding to the maximum field angle of the optical lens, and SAG is the Sg value corresponding to the cemented surface S11 (SAG is calculated as shown in fig. 4).

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

Watch 10

Conditions/examples	Example 1	Example 2	Example 3
				D/h/FOV	0.012	0.013	0.013
arctan(SAG(S11)/d(S11))	44.500	52.900	52.500
				(R5-d5)/R6	1.557	1.557	1.557
F3/F	17.011	19.297	18.405
				\|F6/F5\|	1.138	1.124	1.143
F23/F56	-0.943	-1.193	-1.001
				BFL/TTL	0.171	0.173	0.214
F6/F	1.061	1.058	1.014

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. An optical lens in which the number of lenses having optical power is six, which are: the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged 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 is a meniscus lens with 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 is a meniscus lens with negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

the third lens is a meniscus lens with 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 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;

the fifth lens has a negative optical power; and

the sixth lens has positive focal power, and the fifth lens and the sixth lens are mutually glued;

F3/F is larger than or equal to 13 between the total focal length F of the optical lens and the focal length F3 of the third lens.

2. An optical lens according to claim 1,

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

the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface.

3. An optical lens according to claim 1, characterized in that at least two of the first to sixth lenses are glass lenses.

4. An optical lens according to any one of claims 1 to 3, characterized in that the refractive index Nd1 ≧ 1.65 of the first lens material.

5. The optical lens according to any one of claims 1 to 3, wherein 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 (D180 °)/(h FOV) ≦ 4.500.

6. An optical lens according to any one of claims 1 to 3, characterized in that the opening angle of the cemented surface S11 of the fifth lens and the sixth lens satisfies arctan (SAG (S11)/d (S11)) > 40 °;

wherein d (S11) is a half aperture of a maximum clear aperture of the cemented surface corresponding to a maximum angle of view of the optical lens, and SAG (S11) is a Sg value at the maximum clear aperture of the cemented surface.

7. An optical lens barrel according to any one of claims 1 to 3, wherein a radius of curvature R5 of the object side surface of the third lens, a center thickness d5 of the third lens, and a radius of curvature R6 of the image side surface of the third lens satisfy 1.2 ≦ (R5-d5)/R6 ≦ 1.8.

8. An optical lens barrel according to any one of claims 1 to 3, wherein the third lens is made of a plastic material.

9. An optical lens according to any one of claims 1 to 3, characterized in that 0.5 ≦ F6/F5 ≦ 1.5 between the focal length F5 of the fifth lens and the focal length F6 of the sixth lens.

10. An optical lens barrel according to any one of claims 1 to 3, wherein-2. ltoreq. F23/F56. ltoreq. F354 is satisfied between the focal length F23 of the second and third lens groups and the focal length F56 of the fifth and sixth lens groups.

11. An optical lens according to any one of claims 1 to 3, characterized in that BFL/TTL ≥ 0.1 is satisfied between an optical back focus BFL of the optical lens and an optical length TTL of the optical lens.

12. An optical lens according to any one of claims 1 to 3, characterized in that the back focus offset is ≤ 0.02mm in a temperature range of-40 ℃ -105 ℃.

13. An optical lens according to any one of claims 1 to 3, characterized in that a diaphragm is provided between the fourth lens and the fifth lens.

14. An optical lens according to claim 1, characterized in that 0.55 ≦ F6/F ≦ 1.55 between the total focal length F of the optical lens and the focal length F6 of the sixth lens.

15. An optical lens in which the number of lenses having optical power is six, which are: the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged 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 fifth lens has a negative optical power; and

the sixth lens has positive optical power;

the total focal length F of the optical lens and the focal length F6 of the sixth lens meet the condition that F6/F is more than or equal to 0.55 and less than or equal to 1.55;

16. The optical lens according to claim 15,

17. An optical lens according to claim 15, characterized in that at least two of the first to sixth lenses are glass lenses.

18. An optical lens according to any one of claims 15 to 17, characterized in that the refractive index Nd1 ≧ 1.65 of the first lens material.

19. The optical lens assembly as claimed in any one of claims 15 to 17, wherein a maximum clear aperture D of an object-side surface of the first lens corresponding to a maximum field angle of the optical lens assembly, an image height h corresponding to a maximum field angle of the optical lens assembly, and a maximum field angle FOV of the optical lens assembly satisfy (D180 °)/(h FOV) ≦ 4.500.

20. An optical lens according to any one of claims 15 to 17, characterized in that an opening angle of a cemented surface S11 of the fifth lens and the sixth lens satisfies arctan (SAG (S11)/d (S11)) > or more than 40 °;

21. An optical lens barrel according to any one of claims 15 to 17, wherein a radius of curvature R5 of the object side surface of the third lens, a center thickness d5 of the third lens, and a radius of curvature R6 of the image side surface of the third lens satisfy 1.2 ≦ (R5-d5)/R6 ≦ 1.8.

22. An optical lens barrel according to any one of claims 15 to 17, wherein the third lens is made of a plastic material.

23. An optical lens according to any one of claims 15 to 17, characterized in that 0.5 ≦ F6/F5 ≦ 1.5 between the focal length F5 of the fifth lens and the focal length F6 of the sixth lens.

24. An optical lens barrel according to any one of claims 15 to 17, wherein a focal length F23 of the second and third lens groups and a focal length F56 of the fifth and sixth lens groups satisfy-2 ≦ F23/F56 ≦ -0.4.

25. An optical lens according to any one of claims 15 to 17, characterized in that BFL/TTL ≥ 0.1 is satisfied between an optical back focus BFL of the optical lens and an optical length TTL of the optical lens.

26. An optical lens according to any one of claims 15 to 17, characterized in that the back focus offset is ≤ 0.02mm in a temperature range of-40 ℃ -105 ℃.

27. An optical lens according to any one of claims 15 to 17, characterized in that a diaphragm is arranged between the fourth lens and the fifth lens.

28. An optical lens barrel according to claim 16, wherein the fifth lens and the sixth lens are cemented to each other.