CN208818912U

CN208818912U - A kind of fish eye lens

Info

Publication number: CN208818912U
Application number: CN201821462930.9U
Authority: CN
Inventors: 曹杏
Original assignee: Jiangxi Phenix Optical Technology Co Ltd
Current assignee: Jiangxi Phenix Optical Technology Co Ltd
Priority date: 2018-09-04
Filing date: 2018-09-04
Publication date: 2019-05-03
Anticipated expiration: 2028-09-04

Abstract

The utility model relates to fish eye lens, the first lens including the convex-concave negative power being arranged successively from the object side to the image side, second lens of concave-concave negative power, the third lens of biconvex positive light coke, 4th lens of biconvex positive light coke, the 5th lens of concave-concave negative power, the 6th lens of biconvex positive light coke, wherein the one the second lens are glass lens, and the 3rd the 5th the 6th lens are plastic aspheric lens.By reasonable distribution focal power, the utility model visual field is up to ultra-wide angle, it is seen that with it is infrared confocal, and realize 4K be imaged, meanwhile, under -40~85 DEG C of high and low temperature environments, resolving power is remained unchanged.

Description

A kind of fish eye lens

Technical field

The utility model belongs to lens technology field more particularly to a kind of fish eye lens.

Background technique

With the development of protection and monitor field, high definition fish eye lens can be seen everywhere.It, can be full after even 4K concept proposes The fish eye lens of sufficient 4K demand also comes into being.But traditional fish eye lens, in order to reach the effect of visible and infrared all high definitions Fruit can all use more pieces of eyeglasses, in order to reach high/low temperature not defocus, all do not use plastic lens substantially.Not only structure bulky, and And higher cost.The utility model guarantees 4K image quality under the premise of reducing cost, and field angle reaches ultra-wide angle, not only Infrared not defocus, while under -40~85 DEG C of high and low temperature environments, resolving power remains unchanged.

Utility model content

The purpose of this utility model is to provide a kind of fish eye lens, including set gradually along light incident direction first Lens, the second lens, the third lens, the 4th lens, the 5th lens and the 6th lens, form entire optical system；Described first Lens, second lens are glass lens, and the third lens, the 5th lens and the 6th lens are plastics aspheric Face lens；First lens are convex-concave negative power, and second lens are concave-concave negative power, and the third lens are double Convex positive light coke, the 4th lens are biconvex positive light coke, and the 5th lens are concave-concave negative power, the 6th lens For biconvex positive light coke.

Preferably, the focal length of first lens is f₁, the focal length of the entire optical system is f, meets: 2.5 < | f₁/f |<6.5。

Preferably, the refractive index of first lens and Abbe number are respectively n₁And v₁, meet: 0.01 < n₁/v₁<0.05。

Preferably, the focal length of first lens is f₁, the focal length of second lens is f₂, meet: 1.5 < | f₁/f₂|< 3.5。

Preferably, the focal length of the third lens is f₃, the focal length of the entire optical system is f, meets: 3 < | f₃/f|< 5。

Preferably, the focal length of the 5th lens is f₅, the focal length of the 6th lens is f₆, meet: -0.5 < | f₅/f₆| <1.5。

Preferably, the fish-eye field angle FOV meets: 222o≤FOV≤252o.

Preferably, the 4th lens are glass lens or plastic aspheric lens.

Preferably, there is a diaphragm between the third lens and the 4th lens.

Preferably, the aspherical shape of the third lens, the 5th lens and the 6th lens is all satisfied equation:

In above formula, parameter c is curvature corresponding to radius, and y is radial coordinate (its unit is identical with length of lens unit), K is circular cone whose conic coefficient, and as k < -1, face shape curve is hyperbola, is parabola when k=-1, and when -1 < k < 0 is ellipse Circle is circle when k=0, is oblateness when k > 0, α indicates coefficient corresponding to each radial coordinate.

Preferably, each aspherical relevant parameter is listed in the table below:

。

Preferably, the focal length and refractive index of first lens to the 6th lens meet the following conditions:

-10≤f₁≤-6	1.6≤n₁≤1.8
		-6≤f₂≤2	1.6≤n₁≤1.8
-5≤f₃≤8	1.5≤n₃≤1.7
		4≤f₄≤7	1.5≤n₃≤1.7
-6≤f₅≤-3	1.5≤n₅≤1.7
		2≤f₆≤6	1.5≤n₅≤1.7

Preferably, the field angle FOV of the camera lens meets: 222 °≤FOV≤252 °

The camera lens moulds mixed structure using glass, under the premise of overcoming the wasting of resources, realizes 4K imaging, field angle is up to super wide Angle, not only it is visible with it is infrared confocal, while being still able to maintain its excellent performance under -40 DEG C~85 DEG C of high and low temperature environment.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model.

Fig. 2 is the index path of the utility model.

Specific embodiment

Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.It can manage Solution, specific embodiment described herein are used only for explaining the utility model, rather than the restriction to the utility model.Separately It is outer it should also be noted that, illustrate only part relevant to the utility model for ease of description, in attached drawing and it is not all in Hold.

As depicted in figs. 1 and 2, the utility model includes the first lens L1 set gradually along light incident direction, second Lens L2, the third lens L3, the 4th lens L4, the 5th lens L5 and the 6th lens L6；

Fish eye lens as described above, first lens, second lens be glass lens, the third lens, 5th lens and the 6th lens are plastic aspheric lens.

The aspherical shape of fish eye lens as described above, the third lens, the 5th lens and the 6th lens is all satisfied Equation:

In above formula, parameter c is curvature corresponding to radius, and y is radial coordinate (its unit is identical with length of lens unit), K is circular cone whose conic coefficient, and as k < -1, face shape curve is hyperbola, is parabola when k=-1, and when -1 < k < 0 is ellipse Circle is circle when k=0, is oblateness when k > 0, α indicates coefficient corresponding to each radial coordinate, accurately set by the above parameter The face molded dimension of both-sided aspherical, aspherical relevant parameter are listed in the table below before and after fix-focus lens:

A kind of fish eye lens as described above, first lens are convex-concave negative power, and second lens are concave-concave Negative power, the third lens are biconvex positive light coke, and the 4th lens are biconvex positive light coke, and the 5th lens are Concave-concave negative power, the 6th lens are biconvex positive light coke.

A kind of fish eye lens as described above, the focal length of first lens and the focal length of entire optical system meet: 2.5 <|f₁/f|<6.5。

A kind of fish eye lens as described above, the refractive index and Abbe number of first lens meet: 0.01 < n₁/v₁< 0.05。

The focal length of a kind of fish eye lens as described above, the focal length of first lens and second lens meets: 1.5 <|f₁/f₂|<3.5。

The focal length of a kind of fish eye lens as described above, the focal length of the third lens and entire optical system meets: 3 < | f₁/f|<5。

A kind of fish eye lens as described above, the focal length of the 5th lens and the focal length of the 6th lens meet: -0.5 < | f₅/f₆|<1.5。

A kind of fish eye lens as described above, the focal length and refractive index of first lens to the 6th lens meet with Lower condition:

-10≤f₁≤-6	1.6≤n₁≤1.8
		-6≤f₂≤2	1.6≤n₂≤1.8
-5≤f₃≤8	1.5≤n₃≤1.7
		4≤f₄≤7	1.5≤n₄≤1.7
-6≤f₅≤-3	1.5≤n₅≤1.7
		2≤f₆≤6	1.5≤n₆≤1.7

The field angle FOV of a kind of fish eye lens as described above, the camera lens meets: 222 °≤FOV≤252 °.

A kind of fish eye lens as described above, the 4th lens are glass lens or plastic aspheric lens.

A kind of fish eye lens as described above, has a diaphragm between the third lens and the 4th lens.

As shown in Fig. 2, it was verified that the utility model makes to tie using glass modeling mixed structure under the premise of reducing cost Structure is lighter, ensure that 4K image quality, especially field angle reach ultra-wide angle, not only infrared not defocus, in -40 DEG C~85 DEG C of height Camera lens does not run coke under low temperature environment, and performance still keeps excellent.

The above is only the preferred embodiments of the utility model, are not intended to limit the utility model, all in the utility model Spirit and principle within, any modification, equivalent replacement, improvement and so on should be included in the protection model of the utility model Within enclosing.

Claims

1. a kind of fish eye lens, it is characterised in that: including set gradually along light incident direction the first lens, the second lens, The third lens, the 4th lens, the 5th lens and the 6th lens, form entire optical system；

First lens, second lens are glass lens, and the third lens, the 5th lens and the described 6th are thoroughly Mirror is plastic aspheric lens；

First lens are convex-concave negative power, and second lens are concave-concave negative power, and the third lens are biconvex Positive light coke, the 4th lens are biconvex positive light coke, and the 5th lens are concave-concave negative power, and the 6th lens are Biconvex positive light coke.

2. a kind of fish eye lens according to claim 1, which is characterized in that the focal length of first lens is f₁, described whole The focal length of a optical system is f, is met: 2.5 < | f₁/f|<6.5。

3. a kind of fish eye lens according to claim 2, which is characterized in that the refractive index and Abbe number of first lens Respectively n₁And v₁, meet: 0.01 < n₁/v₁<0.05。

4. a kind of fish eye lens according to claim 2, which is characterized in that the focal length of first lens is f₁, described The focal length of two lens is f₂, meet: 1.5 < | f₁/f₂|<3.5。

5. a kind of fish eye lens according to claim 1, which is characterized in that the focal length of the third lens is f₃, described whole The focal length of a optical system is f, is met: 3 < | f₃/f|<5。

6. a kind of fish eye lens according to claim 1, which is characterized in that the focal length of the 5th lens is f₅, described The focal length of six lens is f₆, meet: -0.5 < | f₅/f₆|<1.5。

7. a kind of fish eye lens according to claim 1, which is characterized in that the fish-eye field angle FOV meets: 222°≤FOV≤252°。

8. a kind of fish eye lens according to claim 1, which is characterized in that the 4th lens are glass lens or plastics Non-spherical lens.

9. a kind of fish eye lens according to claim 1, which is characterized in that have between the third lens and the 4th lens One diaphragm.

10. a kind of fish eye lens according to claim 1, which is characterized in that the third lens, the 5th lens and the 6th The aspherical shape of lens is all satisfied equation:

In above formula, parameter c is curvature corresponding to radius, and y is radial coordinate (its unit is identical with length of lens unit), and k is Circular cone whose conic coefficient, as k < -1, face shape curve is hyperbola, is parabola when k=-1, is ellipse, k when -1 < k < 0 It is circle when=0, is oblateness when k > 0, α indicates coefficient corresponding to each radial coordinate.

11. a kind of fish eye lens according to claim 10, which is characterized in that each aspherical relevant parameter is listed in the table below: