CN209356747U

CN209356747U - A kind of big target surface wide-angle lens optical system

Info

Publication number: CN209356747U
Application number: CN201920286317.4U
Authority: CN
Inventors: 阮川璞; 赵武
Original assignee: NANYANG HAIKE OPTOELECTRONICS CO Ltd
Current assignee: NANYANG HAIKE OPTOELECTRONICS CO Ltd
Priority date: 2019-03-07
Filing date: 2019-03-07
Publication date: 2019-09-06
Anticipated expiration: 2029-03-07

Abstract

The utility model relates to a kind of big target surface wide-angle lens optical systems, it is characterized by: optical system be by with negative power the first lens, the second lens of negative power, the third lens of positive light coke, the 4th lens of positive light coke, the 5th lens of positive light coke, negative power the 6th lens, the 7th lens and cutoff filter of positive light coke form, along optical axis from subject to the sequence arrangement as planar side, different distance subject can be moved integrally by camera lens and realize the blur-free imaging at image planes.This optical system all uses glass spherical lens, and field angle is big, high resolution, can match the big target surface chip of 1/2 " CCD or CMOS and use.

Description

A kind of big target surface wide-angle lens optical system

Technical field

The invention belongs to digital-scroll technique technical fields, and in particular to a kind of big target surface wide-angle lens optical system.

Background technique

In recent years, the vehicle electronics products rapid proliferation such as Train-borne recorder, Streaming Media rearview mirror, consumer is for such electricity The nighttime image quality of sub- product proposes more requirements, it is desirable to obtain more vision dead zone dark portion information.Digital industry has one Kind " the big level-one in bottom kills people " popular saying, that is to say, that increasing sensitive chip area is to promote night effect most directly effectively Method.Wide-angle lens on the market at present, is generally only capable of being fitted to 1/2.7 " sensitive chip, and 1/2 " sense can be fitted to by rarely having The camera lens of optical chip.

Summary of the invention

The object of the present invention is to provide a kind of big target surface wide-angle lens optical systems, can match 1/2 " the photosensitive core of big target surface Piece.

To reach such purpose, the technical solution provided by the present invention is: optical system is by with negative power First lens, the second lens of negative power, the third lens of positive light coke, the 4th lens of positive light coke, positive light coke 6th lens of the 5th lens, negative power, the 7th lens and the cutoff filter composition of positive light coke, along optical axis from quilt Object is taken the photograph to the sequence arrangement as planar side.

First lens are the convex-concave spherical lenses for being convex to object space, and focal power is negative, using light crown glass；

Second lens are concave-concave spherical lenses, and focal power is negative, using dense flint glass；

The third lens are biconvex spherical lenses, and focal power is positive, using dense flint glass；

4th lens are biconvex spherical lenses, and focal power is positive, using lanthanum flint glass；

5th lens are biconvex spherical lenses, and focal power is positive, using lanthanum crown glass；

6th lens are concave-convex aspheric lens, and focal power is negative, using dense flint glass；

7th lens are biconvex spherical lenses, and focal power is positive, using heavy-lanthanide flint glass.

5th lens are Nian Jie with the 6th lens at balsaming lens, and focal power is positive.

Lens focus f, the first focal length of lens f1, the second focal length of lens f2, the third lens focal length f3, the 4th focal length of lens F4, balsaming lens focal length f_jh, the 7th focal length of lens f7 satisfaction:

1.5<|f1/f|<2.5；1<|f2/f|<1.5；|f3/f|<2；1.5<|f4/f|<2.5；5<|f_jh/f|；3<|f7/f |。

Lens system diaphragm is between the 4th lens and the 5th lens.

Lens optical system overall length TOTR meets: 17mm < TOTR < 25mm.

Compared with the prior art, the present invention has as follows a little:

1. the present invention uses seven sheet glass spherical lenses, by optimization design, reasonable distribution focal power both guarantees system Sufficiently large field angle, and 1/2 " big target surface sensitive chip can be matched.

2. clarity height of the present invention is, it can be achieved that full filed 1080P high definition is shown.

3. the configuration of the present invention is simple, compact, can meet electronics miniaturization demand, effectively avoid using big target surface Bring volume hypertrophy problem after sensitive chip.

4. the present invention is all using spherical lens, structure is simple, and processing is flexible, without putting into height as plastic aspherical element High die cost, cost performance are high.

Detailed description of the invention

Specific embodiments of the present invention are described in further detail with reference to the accompanying drawing.

Fig. 1 is optical system diagram of the present invention.

Specific embodiment

In conjunction with Fig. 1, which is successively from the object side to the image side along optical axis direction: tool Have the first lens L1 of negative power, the second lens L2 of negative power, the third lens L3 of positive light coke, positive light coke Four lens L4, the 5th lens L5 of positive light coke, negative power the 6th lens L6, the 7th lens L7 of positive light coke and infrared Edge filter L8.

The first lens L1 is the convex-concave spherical lens for being convex to object space, and focal power is negative, main to use using light crown glass Enter optical system in obtaining wide-angle visual field incident ray.

The second lens L2 is concave-concave spherical lens, and focal power is negative, and using dense flint glass, is mainly used for quickly repairing Normal incidence light angle reduces and enters subsequent lens angle of incidence of light, correction system ratio chromatism, and the curvature of field.

The third lens L3 is biconvex spherical lens, and focal power is positive, and using dense flint glass, is mainly used for reducing system System ratio chromatism,.

4th lens L4 is biconvex spherical lens, and focal power is positive, using lanthanum flint glass.It is mainly used for correcting big target surface Bring the curvature of field and spherical aberration.

The 5th lens L5 is biconvex spherical lens, and focal power is positive, using lanthanum crown glass；The 6th lens L6 is Concave-convex aspheric lens, focal power are negative, using dense flint glass.For the two bonding at balsaming lens, emphasis is intelligent for balance system Difference reduces ratio chromatism, and higher order aberratons.

The 7th lens L7 is biconvex spherical lens, and focal power is positive, using heavy-lanthanide flint glass.Emphasis is for correcting The curvature of field reduces high-order spherical aberration.

Lens focus f, the first focal length of lens f1, the second focal length of lens f2, the third lens focal length f3, the 4th focal length of lens F4, balsaming lens focal length f_jh, the 7th focal length of lens f7 satisfaction: 1.5 < | f1/f | < 2.5；1<|f2/f|<1.5；|f3/f|<2；1.5 <|f4/f|<2.5；5<|f_jh/f|；3<|f7/f|.By reasonable distribution focal power, guarantee the harmony of eyeglass incidence angle, reduces System tolerance susceptibility, reduces on axis and the outer visual field aberration of axis, realization full filed 1080P high definition are shown.

Lens system diaphragm is between the 4th lens L4 and the 5th lens L5.

Lens optical system overall length TOTR meets: 17mm < TOTR < 25mm.

Specifically, in the present embodiment, the focal length f of this FISH EYE LENS OPTICS system is 4.2mm, aperture F2.0, visual field 2 ω=150 ° of angle, optics overall length TOTR=23.8mm, detail parameters are as follows:

Surf	Radius	Thickness	Nd	Vd
					1	50	0.7	1.5	70
2	4	4
					3	-8	0.5	1.8	26
4	8	0.7
					5	27	2	1.8	24
6	-12	0.1
					7	9	3.5	1.8	47
8	-14	3
					Diaphragm	Infinity	0.1
10	300	2.4	1.7	58
					11	-3	0.5	1.8	24
12	-9	0.1
					13	27	1.4	1.8	43
14	-27	0.5
					15	Infinity	1	1.5	68
16	Infinity	0.7
					IMA	Infinity	2.6

Fig. 1 is optical system diagram of the present invention.

It the composite can be widely applied to the vehicle-mounted digitals products such as recorder/Streaming Media rearview mirror, but be not only defined in vehicle Load field.This system excellent optical performance is equally applicable for safety monitoring, the movement of the characteristics such as demand large aperture and big field angle The fields such as DV.

As described above be in conjunction with particular content provide preferred embodiment, and do not have to limitation the present invention, it is all with it is of the invention Approximations such as method, structure, identical, or for making any modifications, equivalent replacements, and improvements etc. under the premise of present inventive concept, It all should be considered as protection scope of the present invention.

Claims

1. a kind of big target surface wide-angle lens optical system, it is characterised in that: optical system is saturating by first with negative power Mirror, the second lens of negative power, the third lens of positive light coke, the 4th lens of positive light coke, positive light coke the 5th thoroughly 6th lens of mirror, negative power, the 7th lens and the cutoff filter composition of positive light coke, along optical axis from subject To the sequence arrangement as planar side；5th lens are Nian Jie with the 6th lens at balsaming lens, and focal power is positive.

2. big target surface wide-angle lens optical system as described in claim 1, it is characterised in that: first lens are to be convex to object The convex-concave spherical lens of side, focal power is negative, using light crown glass；Second lens are concave-concave spherical lenses, and focal power is It is negative, using dense flint glass；The third lens are biconvex spherical lenses, and focal power is positive, using dense flint glass；Described Four lens are biconvex spherical lenses, and focal power is positive, using lanthanum flint glass；5th lens are biconvex spherical lens, light Focal power is positive, using lanthanum crown glass；6th lens are concave-convex aspheric lens, and focal power is negative, using dense flint glass；Institute Stating the 7th lens is biconvex spherical lens, and focal power is positive, using heavy-lanthanide flint glass.

3. big target surface wide-angle lens optical system as described in claim 1, it is characterised in that: lens focus f, the first lens are burnt Away from f1, the second focal length of lens f2, the third lens focal length f3, the 4th focal length of lens f4, balsaming lens focal length fjh, the 7th lens are burnt Meet away from f7:

1.5<|f1/f|<2.5；1<|f2/f|<1.5；|f3/f|<2；1.5<|f4/f|<2.5；5<|fjh/f|；3<|f7/f|.

4. big target surface wide-angle lens optical system as described in claim 1, it is characterised in that: lens system diaphragm is located at the 4th Between lens and the 5th lens.

5. big target surface wide-angle lens optical system as described in claim 1, it is characterised in that: lens optical system overall length TOTR Meet: 17mm < TOTR < 25mm.