CN107436483A

CN107436483A - 1.7mm ultra-wide angle backsight on-vehicle lens

Info

Publication number: CN107436483A
Application number: CN201710578816.6A
Authority: CN
Inventors: 冯科; 张荣曜; 林飞; 魏硕
Original assignee: Fujian Forecam Optics Co Ltd
Current assignee: Fujian Forecam Optics Co Ltd
Priority date: 2017-07-17
Filing date: 2017-07-17
Publication date: 2017-12-05
Anticipated expiration: 2037-07-17
Also published as: CN107436483B

Abstract

The present invention relates to a kind of 1.7mm ultra-wide angle backsight on-vehicle lens, preceding group of eyeglass A, diaphragm C, rear group of eyeglass B, the optical filter D of positive light coke including the negative power that sets gradually, group eyeglass A is made up of diverging meniscus lens A 1 and positive bent moon thick lens A 2 before described, group eyeglass B is made up of planoconvex spotlight B 1, biconvex lens B 2 and diverging meniscus lens B 3 gluing unit touched afterwards, preceding group of eyeglass A and rear group eyeglass B airspace are 2.3mm, preceding group of eyeglass A focal length f_A=7.08mm, the rear focal length f for organizing eyeglass B_B=3.56mm, diverging meniscus lens A 1 and positive bent moon thick lens A 2 airspace are 1.3mm, the airspace of planoconvex spotlight B 1 and gluing unit is 0.1mm, horizontal field of view of the present invention reaches 130 °, TTL overall lengths are less than 14mm high definition ultra-wide angle on-vehicle lens, imaging effect is good, good manufacturability, and cost is low.

Description

1.7mm ultra-wide angle backsight on-vehicle lens

Technical field

The present invention relates to a kind of 1.7mm ultra-wide angle backsight on-vehicle lens.

Background technology

On-vehicle lens also require more and more just from VGA SDs to the trend development of million high definition pixels, optics overall length at present Short, the camera lens visual field requires increasing, and backsight on-vehicle lens horizontal field of view in the market is generally below 120 °, Er Qiecheng It is poor as showing, although the introducing of plastic aspherical element eyeglass later improves picture matter, because optical plastic heat endurance is poor, Cause the high/low temperature imaging performance of such camera lens bad；In addition, the on-vehicle lens picture brightness containing plastic aspherical element is generally not so good as Full glass lens.For 130 ° of ultra-large vision fields of level, overall length is required for short on-vehicle lens, with the design of global surface glass for Eyeglass technological requirement is high, and difficulty of processing is big, obtains high definition as matter is relatively difficult.

The content of the invention

In view of the deficiencies in the prior art, the technical problems to be solved by the invention are to provide a kind of 1.7mm ultra-wide angle backsight On-vehicle lens.

In order to solve the above-mentioned technical problem, the technical scheme is that：A kind of 1.7mm ultra-wide angle backsight on-vehicle lens, Including along preceding group of eyeglass A of the light negative power that incident direction is set gradually from left to right, diaphragm C, rear group of positive light coke Eyeglass B, optical filter D, organize eyeglass A before described and are made up of diverging meniscus lens A-1 and positive bent moon thick lens A-2, and the rear eyeglass B that organizes is by putting down Convex lens B-1, biconvex lens B-2 and diverging meniscus lens B-3 contiguity gluing unit composition, preceding group of eyeglass A and rear group eyeglass B sky Gas interval is 2.3mm.

Further, the focal length f of the preceding group eyeglass A_A=-7.08mm, the rear focal length f for organizing eyeglass B_B=3.56mm。

Further, the diverging meniscus lens A-1 and positive bent moon thick lens A-2 airspace are 1.3mm, planoconvex spotlight The airspace of B-1 and gluing unit is 0.1mm.

Further, the optics overall length TTL of this camera lens is less than 14mm, and horizontal field of view is more than 130 °.

Further, the diverging meniscus lens A-1 things side is coated with waterproof membrane.

Compared with prior art, the invention has the advantages that：Simple in construction, reasonable in design, horizontal field of view reaches 130 °, TTL overall lengths are less than 14mm high definition ultra-wide angle on-vehicle lens, and imaging effect is good, good manufacturability, and cost is low.

The present invention will be further described in detail with reference to the accompanying drawings and detailed description.

Brief description of the drawings

Fig. 1 is the optical structure chart of the present invention；

Fig. 2 is the MTF image quality evaluation curves of the on-vehicle lens；

Fig. 3 is 30 DEG C of defocus MTF curves of low temperature of the on-vehicle lens；

Fig. 4 is 70 DEG C of defocus MTF curves of high temperature of the on-vehicle lens.

In figure：

Eyeglass A is organized before A-；A-1- diverging meniscus lenses A-1；The positive bent moon thick lens A-2 of A-2-；Eyeglass B is organized after B-；B-1- plano-convexs are saturating Mirror B-1；B-2- biconvex lens B-2；B-3- diverging meniscus lenses B-3；C- diaphragms C；D- optical filters D；F- image planes.

Embodiment

For features described above of the invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing, make detailed Carefully it is described as follows.

As shown in Fig. 1 ~ 4, a kind of 1.7mm ultra-wide angle backsight on-vehicle lens are certainly left using anti-long distance structure, including along light Preceding group of eyeglass A, diaphragm C, rear group of eyeglass B, the optical filter D of positive light coke for the negative power that incident direction is set gradually to the right, Group eyeglass A is made up of diverging meniscus lens A-1 and positive bent moon thick lens A-2 before described, and the rear eyeglass B that organizes is by planoconvex spotlight B-1, biconvex The gluing unit composition of lens B-2 and diverging meniscus lens B-3 contiguity, preceding group of eyeglass A and rear group eyeglass B airspace are 2.3mm.

In the present embodiment, the focal length f of the preceding group eyeglass A_A=-7.08mm, the rear focal length f for organizing eyeglass B_B=3.56mm。

In the present embodiment, the diverging meniscus lens A-1 and positive bent moon thick lens A-2 airspace are 1.3mm, plano-convex The airspace of lens B-1 and gluing unit is 0.1mm.

In the present embodiment, the diverging meniscus lens A-1 things side is coated with waterproof membrane.

In the present embodiment, the optics overall length TTL of this camera lens is less than 14mm, and horizontal field of view is more than 130 °.

In the present embodiment, the optical texture being made up of above-mentioned lens set has reached following optical index：

Focal length：f′=1.7mm；

Relative aperture F=2.0；

The angle of visual field：Horizontal 2w >=130 ° (diagonal 2w >=170 °, image space is as the η ' of visual field 2 >=Ф 4.5mm)；

Chief ray incidence angles：CRA<5°；

Distortion：＜ -90%；

Resolution ratio：It can be adapted to 1,300,000 pixel high-resolution CCD or CMOS chip；

Total length of light path ∑≤14mm, optics rear cut-off distance L ' >=2.5mm；

It is applicable spectral line scope：480nm~656nm.

Each lens parameters are as follows：

In the present embodiment, in optical design, on the premise of 130 ° of horizontal field of view is ensured, to visible light wave range 480- 656nm carries out aberration correction and balance.

In the present embodiment, preceding group of negative power corrects 3 rank aberrations and 5 rank spherical aberrations, is reduced using high-index material The bending of eyeglass and increasing light converging power, it is rear to organize dense flint glass and high index of refraction of the glue pellet by the high dispersion of high index of refraction The lanthanum crown glass of low dispersion forms main correcting chromatic aberration and high-order spherical aberration, and rear group uses refractive index close to the glue pellet negative film of image planes Larger glass corrects the curvature of field, and whole camera lens ensures camera lens refractive index and the distribution of focal power approximate ratio, ensure front and rear group mirror The harmony of the incidence angle size of piece, to reduce the sensitiveness of camera lens, improve manufacturing feasibility.

Fig. 2 is the MTF image quality evaluation curves of on-vehicle lens of the present invention, and environment is 20 DEG C of normal temperature, it is seen that light service band, At spatial frequency 90lp/mm, central vision reaches 0.6,0.7 visual field and reaches 0.4 MTF, fully meets the solution picture of million high definitions Power demand.

Fig. 3 and Fig. 4 is the on-vehicle lens of the present invention defocus MTF curve in the environment of 70 DEG C of -30 DEG C of low temperature and high temperature respectively, At spatial frequency 90lp/mm, the defocusing amount of low temperature and high temperature is at 5 μm, and the MTF of central vision, which declines, is no more than 0.1, height Picture matter shows very outstanding under warm environment, fully meets the environment requirement of on-vehicle lens.

The advantages of this camera lens, is following " "

A) it was found from the technical indicator of completion, total length of light path is shorter, then the small volume of camera lens；It is burnt big afterwards, be advantageous to vehicle-mounted pick-up The installation of system；

B) camera lens horizontal field of view angle is big, can meet the captured in real-time of multilane；

C) camera lens CRA is smaller, can be very good to match 0 °C of RA vehicle-mounted cmos chips, will not produce colour cast and dark angle phenomenon；

D) group negative power before, organizes positive light coke afterwards, ensures the Iimaging Stability under high and low temperature environment；

E), can from high index of refraction, dense flint glass and high index of refraction, the lanthanum crown glass composition gluing unit of low dispersion of high dispersion With high-order spherical aberration outside achromatism and axle；

F) all eyeglasses of on-vehicle lens of the invention are spherical glass, and manufacturability is excellent, reduce eyeglass assembly difficulty, and use is low Price glass, processing and material cost are reduced, while reduce the tolerance sensitivities of camera lens.

The present invention provides a kind of 1.7mm ultra-wide angle on-vehicle lens, using complete 4 groups of designs of spheric glass 5 piece, has well Manufacturability and low cost.The on-vehicle lens horizontal field of view reaches 130 °, possesses 2.0 large aperture, and imaging effect is good, as matter reaches Million high definition ranks, when low light environment or night, the clear of image is also can guarantee that, using anti-long distance structure, effectively 3 rank aberrations and 5 rank spherical aberrations are corrected, and are bent using the low Abbe glass of high index of refraction with correcting aberration and the low light of big wide-angle Degree, high-definition camera level is reached with relatively low cost, suitable for 1/4 inch CCD or CMOS chip.

The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with Modification, it should all belong to the covering scope of the present invention.

Claims

A kind of 1. 1.7mm ultra-wide angle backsight on-vehicle lens, it is characterised in that：Including along light, incident direction is set successively from left to right Preceding group of eyeglass A, diaphragm C, rear group of eyeglass B of positive light coke, the optical filter D for the negative power put, organize eyeglass A by negative curved before described The moon, lens A-1 and positive bent moon thick lens A-2 was formed, and the rear eyeglass B that organizes is by planoconvex spotlight B-1, biconvex lens B-2 and diverging meniscus lens The gluing unit composition of B-3 contiguity, preceding group of eyeglass A and rear group eyeglass B airspace are 2.3mm.
2. 1.7mm ultra-wide angle backsight on-vehicle lens according to claim 1, it is characterised in that：Group eyeglass A Jiao before described Away from f_A=-7.08mm, the rear focal length f for organizing eyeglass B_B=3.56mm。
3. 1.7mm ultra-wide angle backsight on-vehicle lens according to claim 1, it is characterised in that：The diverging meniscus lens A-1 Airspace with positive bent moon thick lens A-2 is 1.3mm, and the airspace of planoconvex spotlight B-1 and gluing unit is 0.1mm.
4. 1.7mm ultra-wide angle backsight on-vehicle lens according to claim 1, it is characterised in that：The optics overall length of this camera lens TTL is less than 14mm, and horizontal field of view is more than 130 °.
5. 1.7mm ultra-wide angle backsight on-vehicle lens according to claim 1, it is characterised in that：The diverging meniscus lens A-1 Thing side is coated with waterproof membrane.