CN205958831U

CN205958831U - On -vehicle optical lens system of little distortion of super wide angle

Info

Publication number: CN205958831U
Application number: CN201620787309.4U
Authority: CN
Inventors: 阮川璞; 曹红曲
Original assignee: NANYANG HAIKE OPTOELECTRONICS CO Ltd
Current assignee: NANYANG HAIKE OPTOELECTRONICS CO Ltd
Priority date: 2016-07-25
Filing date: 2016-07-25
Publication date: 2017-02-15
Anticipated expiration: 2026-07-25

Abstract

The utility model relates to an on -vehicle optical lens system of little distortion of super wide angle, wherein, optical system is the first lens L1 by having negative optical power, negative optical power's second lens L2, positive refractive power's third lens L3, positive refractive power's fourth lens L4, positive refractive power's the 5th lens L5, constitute with infrared cutoff filter L6, along the optical axis from the subject to the series arrangement of image plane side, the clear formation of image in image planes department is not realized to same distance subject accessible camera lens moving as a whole. First lens, fourth lens and the 5th lens are glass aspherical lens, and all the other are the glass lens, and this optical system angle of vision is big, the distortion of little, small, the no TV of distortion, 20 DEG C~85 DEG C of scopes do not have the temperature and float the out of focus phenomenon.

Description

A kind of ultra-wide angle low-distortion on-vehicle lens optical system

Technical field

This utility model belongs to digital-scroll technique technical field and in particular to a kind of ultra-wide angle low-distortion on-vehicle lens optical system System

Background technology

In recent years, further strong to motorcycle safety drive demand with people, vehicle-mounted back vision camera lens obtains fast development.But Rearview mirror head on the market face problems at present：First, universal resolution is not high, substantially based on 300,000 pixels, very Difficulty sees clearly；Secondly, the angle of visual field is not big, and most of Product Level angle of visual field is difficult to break through 120 °；In addition, distortion is larger, figure As distortion substantially, some high-end products do not solve aberration problems it has to add in systems at the high electronic algorithms of price Reason device, carries out electronic distortion rectification by software algorithm；It is exactly also poor reliability, some products use in a large number for reduces cost Plastic aspherical element, thermally-stabilised difference, it is difficult to ensure that normal work under extremely cold or very hot environment.

With the development of car networking technology, further strong to the demand of real image, this requires that vehicle-mounted back vision camera lens has Higher definition, bigger angle, undistorted picture and more preferable heat stability, there is presently no optical system can be fine Solve the above problems.

Content of the invention

The purpose of this utility model is to provide a kind of ultra-wide angle low-distortion on-vehicle lens optical system,

For reaching such purpose, technical scheme provided by the utility model is：Optical system is burnt by having negative light First lens L1 of degree, the second lens L2 of negative power, the 3rd lens L3 of positive light coke, the 4th lens of positive light coke L4, the 5th lens L5 of positive light coke and cutoff filter L6 composition, suitable to image plane side from subject along optical axis Sequence arranges.

Described first lens L1 is the Glass aspheric meniscus lens being convex to object space, and focal power is negative, using low softening point Glass；

Described second lens L2 is concave-concave spherical lenss, and focal power is negative, using lanthanum crown glass；

Described 3rd lens L3 is biconvex spherical lenss, and focal power is just, using dense flint glass；

Described 4th lens L4 is double convex glass non-spherical lens, and focal power is just, using low softening point glass；

Described 5th lens L5 is double convex glass non-spherical lens, and focal power is just, using low softening point glass；

Described second lens L2 and the 3rd lens L3 bonding become balsaming lenss, and focal power is just；

Lens focus f, the first lens L1 focal length f1, the 4th focal length of lens f4, the 5th focal length of lens f5 meets：

3<|f1/f|<5

1<|f4/f1|>2

|f5/f|>1.5

Lens system diaphragm is located between the 3rd lens L3 and the 4th lens L4.

Lens optical system overall length TOTR meets：12mm<TOTR<17mm.

This utility model embodiment, optical system is made up of six eyeglasses, the wherein first lens, the 4th lens, the 5th saturating Mirror is optical aspherical surface lens, and the second lens and the 3rd lens are spherical lenss, and cutoff filter is plate glass, passes through Reasonable distribution focal power, meets the optical condition of this optical system, has effectively corrected spherical aberration, astigmatism, ratio chromatism, the curvature of field and abnormal The system aberration such as become so as to have ultra-wide angle little distortion performance, can be widely applied to vehicle-mounted back vision and the field such as panorama shows.

Compared with prior art, this utility model has as follows a little：

1. this utility model is realized regarding big rink corner, little distortion, no TV distortion by optical technology.Than existing vehicular rear mirror Brilliance degree is much bigger, can photograph " dead angle " near vehicle right and left taillight；No pincushion or barrel-shaped, linear when shooting drawing Distortion, is conveniently accurately measured and is judged based on picture.

2., all using glass material, no temperature drift phenomenon, reliability is high, loads this optical system for this utility model lens Equipment can be in normal work under extremely cold or very hot adverse circumstances.

3. this utility model high definition, achievable high definition shows (720P).

4. this utility model structure is simple, and compact is conveniently installed and used.

Brief description

Below in conjunction with the accompanying drawings specific embodiment of the utility model is described in further detail.

Fig. 1 is this utility model optical system diagram；

Fig. 2 is this utility model curvature of field and distortion curve figure；

Fig. 3 is the vertical axial aberration curve chart of this utility model；

Fig. 4 is this utility model point range figure.

Fig. 5 is this utility model TV distortion schematic diagram

Specific embodiment

In conjunction with Fig. 1, this ultra-wide angle low-distortion on-vehicle lens optical system along optical axis direction is from the object side to the image side successively：Tool Have the first lens L1 of negative power, the second lens L2 of negative power, the 3rd lens L3 of positive light coke, the of positive light coke Four lens L4, the 5th lens L5 of positive light coke and cutoff filter L6.

Described first lens L1 is the meniscus lens being convex to object space, and focal power is negative, using low softening point glass, main use In the light receiving larger angle range incident.

Described second lens L2 is biconcave lenss, and focal power is negative, using lanthanum crown glass；Described 3rd lens L3 is biconvex Spherical lenss, focal power is just, using dense flint glass；Second lens L2 and the 3rd lens L3 bonding become balsaming lenss, and light is burnt Spend for just, being mainly used in balancing focal power, correction system ratio chromatism, and the curvature of field.

Described 4th lens L4 is double convex glass non-spherical lens, and focal power is just, using low softening point glass, can be effective Offset the barrel distortion that the first lens L1 produces because of high angle scattered light entrance system.

Described 5th lens L5 is double convex glass non-spherical lens, and focal power is just, using low softening point glass；It is convex to thing Aspheric surface is surveyed in face crutches point, is mainly used in correcting the aberrations such as big visual field spherical aberration, the curvature of field, astigmatism and distortion.

Lens focus f, the first lens L1 focal length f1, the 4th focal length of lens f4, the 5th focal length of lens f5 meets：3<|f1/f| <5,1<|f4/f1|>2, | f5/f |>1.5.

Lens system diaphragm is located between the 3rd lens L3 and the 4th lens L4.

Lens optical system overall length TOTR meets：12mm<TOTR<17mm.

Specifically, in the present embodiment, the focal length f of this FISH EYE LENS OPTICS system is 0.83mm, and aperture is F2.0, visual field Angle 2 ω=160 °, detail parameters such as following table：

Surf	Radius	Thickness	Nd	Vd
					1	54.043	2	1.69	53
2	2.32	1.67
					3	-164.75	0.5	1.69	55
4	2.7	3.05	1.92	19
					5	36	0
Diaphragm	Infinity	0.26
					7	3.855	1.3	1.53	70
8	-4.59	0.1
					9	6.33	1.65	1.77	49
10	-1.43	0.49
					11	Infinity	0.8	1.51	68
12	Infinity	0.1

First lens L1, the 4th lens L4 and the 5th lens L5 non-spherical surface meet below equation：

In formula, parameter R is the radius corresponding to radius, and y is that its unit of radial coordinate is identical with length of lens unit, K is circular cone whose conic coefficient；When k-factor is less than -1, the face sigmoid curves of lens is hyperbola, when k-factor is equal to -1, thoroughly The face sigmoid curves of mirror is parabola；When k-factor is between -1 to 0, the face sigmoid curves of lens is ellipse, when k-factor is equal to 0 When, the face sigmoid curves of lens is circle, and when k-factor is more than 0, the face sigmoid curves of lens is oblateness；A₄To A₁₄Represent respectively Coefficient corresponding to each radial coordinate.

surface:

1

2

7

8

9

10

k

-8.426283

-0.018517

-11.357416

-32.197708

11.562142

-0.661822

A4

6.9149E-04

2.0043E-03

3.3081E-02

2.3439E-01

4.7494E-02

5.7686E-02

A6

-1.6288E-05

2.2118E-05

-2.2131E-03

-2.1380E-01

-5.6048E-02

6.1195E-03

A8

2.8429E-07

-4.8074E-04

1.1323E-03

5.9890E-02

3.7357E-03

-8.5107E-04

A10

1.2694E-12

7.1201E-08

-8.4552E-06

7.8338E-07

2.9875E-08

-1.5300E-07

A12

2.1221E-14

1.1316E-08

-9.3813E-06

7.8416E-08

8.2633E-08

-4.1963E-08

A14

3.6209E-16

1.7134E-09

-7.9684E-06

1.4458E-07

3.2808E-08

-1.1016E-08

It is this utility model optical system diagram referring to Fig. 1；

It is this utility model curvature of field and distortion curve figure referring to Fig. 2；

It is the vertical axial aberration curve chart of this utility model referring to Fig. 3；

It is this utility model point range figure referring to Fig. 4；

It is this utility model TV distortion schematic diagram referring to Fig. 5.

From Fig. 1-5 it can be seen that this optical system has good optical property, realize big rink corner, little distortion, no TV abnormal The characteristics such as change.

Be described above as with reference to particular content provide preferred embodiment, and without limit this utility model, all with this The method of utility model, structure etc. are approximate, identical, or for making any modification, equivalent under this utility model concept thereof Replace and improve etc., all should be considered as protection domain of the present utility model.

Claims

1. a kind of ultra-wide angle low-distortion on-vehicle lens optical system, wherein, optical system is saturating by first with negative power Mirror L1, the second lens L2 of negative power, the 3rd lens L3 of positive light coke, the 4th lens L4 of positive light coke, positive light coke The 5th lens L5 and cutoff filter L6 composition, along optical axis from subject to the order of image plane side arrange.

2. ultra-wide angle low-distortion on-vehicle lens optical system as claimed in claim 1 it is characterised in that：Described first lens L1 It is the Glass aspheric meniscus lens being convex to object space, focal power is negative, using low softening point glass；

Described 5th lens L5 is double convex glass non-spherical lens, and focal power is just, using low softening point glass.

3. ultra-wide angle low-distortion on-vehicle lens optical system as claimed in claim 1 it is characterised in that：Described

Second lens L2 and the 3rd lens L3 bonding become balsaming lenss, and focal power is just；

Lens focus f, the first lens L1 focal length f1, the 4th focal length of lens f4, the 5th focal length of lens f5 is full

Foot：

3<|f1/f|<5

1<|f4/f1|>2

|f5/f|>1.5.

4. ultra-wide angle low-distortion on-vehicle lens optical system as claimed in claim 1 it is characterised in that：Lens system diaphragm position Between the 3rd lens L3 and the 4th lens L4.

5. ultra-wide angle low-distortion on-vehicle lens optical system as claimed in claim 1 it is characterised in that：Camera lens

Optical system overall length TOTR meets：12mm<TOTR<17mm.