CN217060618U

CN217060618U - Super wide angle big light ring aspheric surface camera lens

Info

Publication number: CN217060618U
Application number: CN202220616897.0U
Authority: CN
Inventors: 袁国奎
Original assignee: ZHUHAI CHUANFU OPTICAL TECHNOLOGY CO LTD
Current assignee: ZHUHAI CHUANFU OPTICAL TECHNOLOGY CO LTD
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-07-26
Anticipated expiration: 2032-03-21

Abstract

The utility model relates to an ultra-wide angle large aperture aspheric lens, which comprises a first lens group, an iris diaphragm and a second lens group which are arranged in sequence along the incident direction of light; wherein the first lens group has a positive power position that does not move; the second lens group has a moving positive power position; and a focal length value f1 of the first lens group and a focal length value f2 of the second lens group satisfy 1.5 < f1/f2 < 2. Thus, the lens has the advantages of large aperture, small total length, small distortion, high resolution and capability of focusing at a short distance.

Description

Super wide angle big light ring aspheric surface camera lens

Technical Field

The utility model belongs to the technical field of the camera lens, in particular to big light ring aspheric lens of super wide angle.

Background

With the development of society, people have more and more demands on video shooting and higher requirements on video lenses; such as: the important indexes of the commonly used short-focus video lens are high definition, large light flux of a large aperture, good chromatic aberration expression and small distortion. However, the applicant found that: the existing short-focus video lens in the current market has the defects of low resolution, large distortion, small aperture, long shooting close-up distance and the like, seriously influences the shooting quality, and cannot meet the high-quality short-focus video shooting requirement at all.

SUMMERY OF THE UTILITY MODEL

For solving the above-mentioned problem that exists among the prior art, the utility model provides a big light ring little overall length, little distortion high resolution can also closely focus the big light ring aspheric lens of super wide angle.

In order to solve the technical problem, the utility model adopts the following technical scheme:

an ultra-wide-angle large-aperture aspheric lens comprises a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incident direction of light rays; wherein, the first and the second end of the pipe are connected with each other,

the first lens group has a positive power position that does not move;

the second lens group has a moving positive power position;

further, the first lens group and the second lens group satisfy the following formula:

1.5＜f1/f2＜2

wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.

Further, the first lens group and the second lens group are both composed of 7 lenses, wherein the refractive index of at least one lens in the first lens group is greater than 1.4 and less than 1.6, the refractive index of at least five lenses in the first lens group is greater than 1.8 and less than 2, and the refractive index of at least three lenses in the second lens group G2 is greater than 1.8 and less than 1.9.

Furthermore, the abbe number of at least four lenses of the second lens group is greater than 30 and less than 50.

Further, the first lens group comprises two large-bending meniscus lenses, and the second lens and the fourteenth lens counted from the incident direction of light in the optical system formed by the first lens group and the second lens group are glass aspheric lenses.

Further, the second lens group includes a piece of cemented triplet.

Further, the total optical length of the lens is more than 89.5 millimeters and less than 91.5 millimeters.

The utility model has the advantages that:

1. the utility model discloses an above-mentioned technical scheme can realize the little overall length of big light ring, also can realize little distortion high resolution, can also closely focus.

2. The utility model discloses an adopt the great crescent lens of two bendings in first battery of lens, be glass aspheric lens from light incident direction second lens and fourteenth piece in the optical system simultaneously. Therefore, on one hand, the field angle can be optimized and enlarged (L11 and L12 are both meniscus lenses with large bending, the convex surfaces face to the object side, so that the incident angle of the optical system to the object side light is enlarged), and on the other hand, the added aspheric surface can effectively optimize and improve the MTF.

In a possible implementation manner, the second lens group includes a triplet cemented lens (i.e., a lens composed of three lenses), which can effectively optimize apochromatism, thereby improving the imaging definition of the lens and making the image quality more vivid.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of an ultra-wide angle large aperture aspheric lens according to the present invention;

fig. 2 is a longitudinal chromatic aberration diagram of an embodiment of the super-wide-angle large-aperture aspheric lens of the present invention;

fig. 3 is a lateral chromatic aberration diagram of an embodiment of the super-wide-angle large-aperture aspheric lens of the present invention;

fig. 4 is a schematic view of field curvature distortion of an embodiment of an ultra-wide-angle large-aperture aspheric lens according to the present invention;

fig. 5 is a speckle pattern of an embodiment of an ultra-wide-angle large-aperture aspheric lens according to the present invention;

fig. 6 is an MTF diagram of an embodiment of the super-wide-angle large-aperture aspheric lens of the present invention;

fig. 7 is a MTF defocus graph of the embodiment of the super-wide-angle large-aperture aspheric lens.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

An ultra-wide angle big light ring aspheric lens, include first battery of lens, iris diaphragm and the second battery of lens that sets gradually along light incident direction. Wherein, the first and the second end of the pipe are connected with each other,

the first lens group has a positive power position that does not move;

the second lens group has a moving positive power position;

1.5＜f1/f2＜2

In a possible implementation manner, the refractive index of at least one lens in the first lens group is greater than 1.4 and less than 1.6, the refractive index of at least five lenses in the first lens group is greater than 1.8 and less than 2, and the refractive index of at least three lenses in the second lens group is greater than 1.8 and less than 1.9.

The Abbe number of at least four lenses of the second lens group is larger than 30 and smaller than 50.

Big light ring aspheric lens of super wide angle can realize the little total length of big light ring through adopting above-mentioned structure on the one hand, can realize little distortion high resolution in the second aspect, and the third aspect can closely focus to solved and optimized little distortion and good colour difference under the shooting requirement that satisfies high resolution and big light ring in optical system's whole working distance, and satisfied the difficult problem that the shooting of near-end required, simultaneously the utility model discloses compromise the high resolution, little distortion, big light ring satisfies short close-range distance, can match and shoot more than the two million pixels.

In a possible implementation manner, the first lens group comprises two large-bending meniscus lenses, and the second lens and the fourteenth lens counted from the incident direction of the light in the optical system formed by the first lens group and the second lens group are both glass aspheric lenses. Therefore, on one hand, the field angle can be optimized and enlarged (L11 and L12 are both meniscus lenses with large bending, the convex surfaces face to the object side, so that the incident angle of the optical system to the object side light is enlarged), and on the other hand, the added aspheric surface can effectively optimize and improve the MTF.

In a possible implementation manner, the second lens group includes a cemented triplet (i.e., a lens composed of three lenses), which can effectively optimize apochromatism, thereby improving the imaging resolution of the lens and making the image quality more vivid.

In one possible implementation, the total optical length of the lens is greater than 89.5 millimeters and less than 91.5 millimeters.

The following description is made of the super-wide-angle large-aperture aspheric lens according to the present invention.

Referring to fig. 1, the embodiment of the present invention provides an ultra-wide-angle large-aperture aspheric lens, which is a lens with a focal length of 9mm, and includes a first lens group G1 and a second lens group G2 sequentially disposed along the light incident direction, wherein the first lens group G1 is a positive focal power fixed immovable lens group composed of 7 lenses, the second lens group G2 is a positive focal power composed of 7 lenses and is a lens group as a movable focusing group, and the first lens group G1 starts counting the second lens from the light incident direction and is a glass aspheric lens, and the second lens group G2 starts counting the seventh lens from the light incident direction and is a glass aspheric lens. The method comprises the following specific steps: the first lens group G1 consists of a lens L11, a lens L12, a lens L13, a lens L14, a lens L15, a lens L16 and a lens L17, and the second lens group G2 consists of a lens L21, a lens L22, a lens L23, a lens L24, a lens L25, a lens L26 and a lens L27; wherein the lens L11 is a meniscus lens with a negative focal power with a convex surface facing the object, the lens L12 is a meniscus lens with a negative focal power with a convex surface facing the object, the lens L13 is a biconcave negative focal power lens, the lens L14 is a biconvex positive focal power lens, the lens L15 is a biconcave negative focal power lens, the lens L16 is a plano-convex lens with a positive focal power with a convex surface facing the object, the lens L17 is a biconvex positive focal power lens, the lens L21 is a meniscus lens with a positive focal power with a convex surface facing the image, the lens L22 is a plano-concave lens with a negative focal power with a concave surface facing the object, the lens L23 is a meniscus lens with a negative focal power with a convex surface facing the object, the lens L24 is a biconvex positive focal power lens, the lens L25 is a meniscus lens with a negative focal power with a convex surface facing the image, the lens L3 is a biconvex focal power lens, and the lens L42 is a biconvex image focal power 737 lens, and the lens L12 and the lens L27 are glass aspheric lenses, and the lens L23, the lens L24 and the lens L25 form a triple cemented lens. The specific parameters of each lens in the embodiment of the present invention are as shown in table 1 below.

TABLE 1

The parameters of the two-piece glass aspherical lens (lens L12 and lens L27) are specifically shown in table 2 below.

TABLE 2

Will the embodiment of the utility model provides a big light ring aspheric lens of super wide angle carries out vertical chromatic aberration, horizontal chromatic aberration, field curvature distortion, diffuse spot, MTF and MTF out of focus test, and the test result is shown as figure 2-7, can learn from figure 2-7, and the optical system's of this embodiment camera lens aberration correction is good (wherein vertical chromatic aberration is controlled within 0.055mm from wavelength 435mm to wavelength 656mm, and horizontal chromatic aberration control is within 5 um), and the distortion is little (optical distortion is less than-1.6%) and resolution ratio is high (can see out to match pixel chip more than two million by the MTF graph).

It is visible, the utility model discloses the camera lens can realize short focal length, big light ring, short overall length, little distortion, high resolution, and second lens group G2's lens L22 all uses the lens interval to compress to the short overall length compact structure that extremely appears (see table 1 in detail) to lens L27 moreover, assembles the sensitivity of greatly reduced tolerance to follow-up processing procedure technology, improves the volume production yield to manufacturing cost has been reduced.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. An ultra-wide-angle large-aperture aspheric lens is characterized by comprising a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incident direction of light rays; wherein the content of the first and second substances,

the first lens group has a positive power position that does not move;

the second lens group has a moving positive power position;

1.5＜f1/f2＜2

2. The super wide-angle large aperture aspherical lens as claimed in claim 1, wherein the first lens group and the second lens group are each composed of 7 lenses, wherein at least one lens of the first lens group has a refractive index of more than 1.4 and less than 1.6, and at least five lenses have a refractive index of more than 1.8 and less than 2, and at least three lenses of the second lens group has a refractive index of more than 1.8 and less than 1.9.

3. The super-wide angle large aperture aspheric lens as claimed in claim 2, wherein the abbe number of at least four lenses of the second lens group is greater than 30 and less than 50.

4. The super-wide angle large aperture aspherical lens according to claim 2 or 3, wherein the first lens group comprises two curved meniscus lenses, and the second lens and the fourteenth lens in the optical system constituted by the first lens group and the second lens group are both glass aspherical lenses as counted from the light incidence direction.

5. The super-wide angle large aperture aspheric lens system as recited in claim 2 or 3, wherein the second lens group comprises a cemented triplet.

6. The super-wide angle large aperture aspheric lens as claimed in claim 1, 2 or 3, characterized in that the total optical length of the lens is more than 89.5 mm and less than 91.5 mm.

7. The super-wide angle large aperture aspherical lens according to claim 2 or 3, wherein the first lens group is composed of lens L11, lens L12, lens L13, lens L14, lens L15, lens L16 and lens L17, and the second lens group is composed of lens L21, lens L22, lens L23, lens L24, lens L25, lens L26 and lens L27; wherein the lens L11 is a meniscus lens with a negative power with the convex surface facing the object, the lens L12 is a meniscus lens with a negative power with the convex surface facing the object, the lens L13 is a biconcave negative power lens, the lens L14 is a biconvex positive power lens, the lens L15 is a biconcave negative power lens, the lens L16 is a plano-convex lens with positive power and convex surface facing the object, the lens L17 is a biconvex positive power lens, the lens L21 is a meniscus lens with positive power with the convex surface facing the image, the lens L22 is a plano-concave lens with a negative power and a concave surface facing the object, the lens L23 is a meniscus lens with a negative power and a convex surface facing the object, the lens L24 is a biconvex positive power lens, the lens L25 is a meniscus lens with a negative power whose convex surface faces the image, the lens L26 is a biconvex positive power lens, and the lens L27 is a meniscus lens with a negative power whose convex surface faces the image side.