CN209343029U

CN209343029U - A kind of 3.2mm high definition bugeye lens

Info

Publication number: CN209343029U
Application number: CN201822223848.7U
Authority: CN
Inventors: 冯科; 王文敏; 杨明亮; 罗珂珂
Original assignee: Fujian Forecam Tiantong Optics Co Ltd
Current assignee: Fujian Forecam Tiantong Optics Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2019-09-03
Anticipated expiration: 2028-12-28

Abstract

The utility model relates to a kind of 3.2mm high definition bugeye lens, rear group of B being positive in the optical system of the camera lens along light incident direction is successively arranged that focal power is negative from front to back preceding group of A, diaphragm STO and focal power；Group A includes the diverging meniscus lens A set gradually from front to back and plano-convex lens A before described, and the gluing unit that B includes positive meniscus lens B, biconvex lens B and diverging meniscus lens the B contiguity set gradually from front to back is organized after described.The utility model have many advantages, such as 120 ° of level of larger field angle, high definition image quality, optical texture simplify, cost it is more cheap, and it is clear to be able to maintain in -40 DEG C ~+85 DEG C of temperature model picture, is applicable to the occasions such as vehicle driving monitoring, reversing monitoring.

Description

A kind of 3.2mm high definition bugeye lens

Technical field

The utility model relates to a kind of 3.2mm high definition bugeye lenses.

Background technique

Early stage has various wide-angle tight shots to be applied in onboard system in the market, still, the water of many products Straight angle degree is no longer satisfied the monitoring range requirement of multilane between 90 ° -110 ° at present；Secondly lens aperture is not big enough, It directly results in that evening images noise is obvious, and nighttime imaging is ineffective, and is difficult to correct in marginal aberration and high-order spherical aberration, Cause image quality decline in edge obvious；The operating temperature range of last on-vehicle lens at present requires -40~+85 DEG C, compared to wanting in the past Ask higher, the image quality decline under limiting temperature of early stage camera lens is obvious.

Summary of the invention

In view of this, there is level the purpose of this utility model is to provide a kind of 3.2mm high definition bugeye lens 120 ° of larger field angle, high definition image quality, the advantages that optical texture is simplified, cost is more cheap, and at -40 DEG C ~+85 DEG C It is clear that it is able to maintain picture in temperature range, is applicable to the occasions such as vehicle driving monitoring, reversing monitoring.

The technical solution of the utility model is: a kind of 3.2mm high definition bugeye lens, including successively along optical path incident direction It is provided with the rear group of B that preceding group of A, diaphragm STO and the focal power that focal power is negative are positive, organizing A before described includes along optical path incidence side To the diverging meniscus lens A that sets gradually and plano-convex lens A, it is described after group B include set gradually along optical path incident direction it is just curved The gluing unit of moon lens B, biconvex lens B and diverging meniscus lens B contiguity.

Further, the airspace described in the preceding group A between diverging meniscus lens A and plano-convex lens A is 2.73mm.

Further, the airspace between the preceding group A and rear group B is 0.7mm.

Further, the airspace in the rear group B between positive meniscus lens B and gluing unit is 0.1mm.

Further, the plano-convex lens A meets relational expression: Nd >=1.8, Vd≤25；The biconvex lens B meets Relational expression: Nd≤1.7, Vd >=55；The diverging meniscus lens B meets relational expression: Nd >=1.8, Vd≤25, and wherein Nd is refraction Rate, Vd are Abbe constant.

Further, the focal length F of the diverging meniscus lens A₁Meet following relational expression: -1.5≤F₁/F≤-1；Described The gluing unit focal length of lens value F of biconvex lens B and diverging meniscus lens B composition₄₅Meet following relational expression: 2.5≤F₄₅/F≤ 3.5, wherein F is the total focal length value of camera lens.

Further, which meets: HFOV >=120 °, TTL≤17.5mm, FNO≤2.0；In formula HFOV is horizontal field of view, and TTL is optics overall length, and FNO is lens aperture.

Compared with prior art, the utility model has the beneficial effects that

(1) the utility model total length of light path is shorter, small in size, the rear Jiao Shizhong of camera lens, can be with the camera shooting of trigger interface Machine is used cooperatively；

(2) the utility model diaphragm clear aperture is larger, and night light-inletting quantity is sufficient, is useful in night and half-light item completely Part；

(3) negative power is organized before the utility model, organizes positive light coke afterwards, selects the glass material of appropriate index temperature coefficient Material, ensure that still can blur-free imaging in high and low temperature environment；

(4) the utility model selects the crown glass (ED glass) of medium refractive index ultra-low dispersion that biconvex lens B is made, high Refractive index, high dispersion flint glass (ZF glass) diverging meniscus lens B is made, two lens groups come achromatism and height at gluing unit Grade oblique spherical aberration；

(5) eyeglass used in the utility model is spheric glass lens, eyeglass good manufacturability, compared to past needs 6 ~ 7 eyeglasses can be only achieved same performance index, and cost advantage is very big.

To can be more clearly understood the above objects, features, and advantages of the utility model, with reference to the accompanying drawing to this The specific embodiment of utility model elaborates.

Detailed description of the invention

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

Fig. 2 is the visible light MTF curve figure of the utility model embodiment；

Fig. 3 is -40 DEG C of defocus MTF curves of low temperature of the utility model embodiment；

Fig. 4 is+85 DEG C of defocus MTF curves of high temperature of the utility model embodiment.

In figure: 10- diverging meniscus lens A；20- plano-convex lens A；30- diaphragm STO；40- positive meniscus lens B；50- lenticular Mirror B；60- diverging meniscus lens B；70- protects glass；80- imaging surface.

Specific embodiment

As shown in Fig. 1 ~ 4, a kind of 3.2mm high definition bugeye lens, including light focus is disposed with along optical path incident direction The rear group of B that preceding group of A, diaphragm STO30 and the focal power being negative are positive is spent, organizing A before described includes successively setting along optical path incident direction The diverging meniscus lens A10 that sets and plano-convex lens A20, it is described after group B include that the positive bent moon that sets gradually along optical path incident direction is saturating The gluing unit of mirror B40, biconvex lens B50 and diverging meniscus lens B60 contiguity.Protection 70 He of glass is additionally provided at gluing unit rear Imaging surface 80.

In the present embodiment, the airspace organized described in A between diverging meniscus lens A10 and plano-convex lens A20 before described is 2.73mm。

In the present embodiment, the airspace organized between A and rear group B before described is 0.7mm.

In the present embodiment, it is 0.1mm that the airspace in B between positive meniscus lens B40 and gluing unit is organized after described.

In the present embodiment, the plano-convex lens A20 meets relational expression: Nd >=1.8, Vd≤25；The biconvex lens B50 meets relational expression: Nd≤1.7, Vd >=55；The diverging meniscus lens B60 meets relational expression: Nd >=1.8, Vd≤25, Middle Nd is refractive index, and Vd is Abbe constant.

In the present embodiment, the focal length F of the diverging meniscus lens A10₁Meet following relational expression: -1.5≤F₁/F≤-1；Institute The gluing unit focal length of lens value F for biconvex lens B50 and diverging meniscus lens the B60 composition stated₄₅Meet following relational expression: 2.5≤ F₄₅/ F≤3.5, wherein F is the total focal length value of camera lens.

In the present embodiment, which meets: HFOV >=120 °, TTL≤17.5mm, FNO≤2.0；In formula HFOV is horizontal field of view, and TTL is optics overall length, and FNO is lens aperture.

The design parameter table of table 1, the present embodiment

In the present embodiment, optical lens has reached following optical index:

(1) focal length: f '=3.2mm；(2) relative aperture F=2.0；(3) field angle: 2w >=140 ° (image space as 2 η ' of visual field >= Ф6.6mm)；(4) TV distorts: < -15.6%；(5) resolution ratio: can be suitable with 2,000,000 pixel high-resolution CCD or cmos camera Match；(6) total length of light path TTL≤17.5mm, optics rear cut-off distance L' >=5.5mm；(7) it is applicable in spectral line range: 420nm~700nm.

Specific implementation process:

The optical lens uses anti-long distance structure, and when camera lens is started to work, preceding group of A of negative power can be greatly reduced greatly The angle of the incident ray of angular field, diverging meniscus lens A10 are made using the crown glass (K system glass) of the low dispersion of low-refraction At plano-convex lens A20 is made of the flint glass (ZF system glass) of the high dispersion of high refractive index, and two panels lens combination is conducive to drop Low system curvature of the image and ratio chromatism,；The biconvex lens B50 of balsaming lens group by medium refractive index ultra-low dispersion crown board glass Glass (ED glass) is made, and diverging meniscus lens B60 is made of the flint glass (ZF glass) of high refractive index, high dispersion, and cemented surface is curved To diaphragm, when light passes through gluing unit, gluing unit can correct system color difference and advanced oblique spherical aberration；Meanwhile gluing unit biconvex The ED glass of lens B50 possesses negative thermal refractive index coefficient, can with the positive refracting power temperature coefficient of compensation system totality, thus Preferably realize -40~+85 DEG C of temperature-compensating.

Fig. 2 is the visible light MTF curve of the present embodiment, and environment is 20 DEG C of room temperature, and 420~700nm service band, MTF exists At spatial frequency 120lp/mm, central vision reaches 0.55,0.7 visual field and reaches 0.45, can achieve the solution picture of 2,000,000 high definitions Power demand.

Fig. 3 and Fig. 4 is -40 DEG C and+85 DEG C of high temperature of low temperature of the defocus MTF curve of the present embodiment, and wherein lens barrel is gold Belong to material, the material of pedestal is PC+30%GF, and at spatial frequency 120lp/mm, the defocusing amount of low temperature is 6 μm, the defocus of high temperature Amount is 4 μm, and for defocusing amount in tolerance interval, image quality shows the environment requirement for fully meeting on-vehicle lens.

Aforesaid operations process and software and hardware configuration are not intended to limit this only as the preferred embodiment of the utility model The scope of the patents of utility model, equivalents made by using the description of the utility model and the drawings, or directly or It is used in correlative technology field indirectly, is also included in the patent protection scope of the utility model.

Claims

1. a kind of 3.2mm high definition bugeye lens, it is characterised in that: be including being disposed with focal power along optical path incident direction The rear group of B that negative preceding group of A, diaphragm STO and focal power is positive, it is described before group A include set gradually along optical path incident direction it is negative Meniscus lens A and plano-convex lens A, organizing B after described includes the positive meniscus lens B set gradually along optical path incident direction, lenticular The gluing unit of mirror B and diverging meniscus lens B contiguity.

2. 3.2mm high definition bugeye lens according to claim 1, it is characterised in that: negative bent moon described in group A before described Airspace between lens A and plano-convex lens A is 2.73mm.

3. 3.2mm high definition bugeye lens according to claim 1, it is characterised in that: before described between group A and rear group B Airspace be 0.7mm.

4. 3.2mm high definition bugeye lens according to claim 1, it is characterised in that: positive meniscus lens in group B after described Airspace between B and gluing unit is 0.1mm.

5. 3.2mm high definition bugeye lens according to claim 1, it is characterised in that: the plano-convex lens A, which meets, to close It is formula: Nd >=1.8, Vd≤25；The biconvex lens B meets relational expression: Nd≤1.7, Vd >=55；The diverging meniscus lens B meets relational expression: Nd >=1.8, Vd≤25, and wherein Nd is refractive index, and Vd is Abbe constant.

6. 3.2mm high definition bugeye lens according to claim 1, it is characterised in that: the coke of the diverging meniscus lens A Away from F₁Meet following relational expression: -1.5≤F₁/F≤-1；The gluing unit lens of the biconvex lens B and diverging meniscus lens B composition Focal length value F₄₅Meet following relational expression: 2.5≤F₄₅/ F≤3.5, wherein F is the total focal length value of camera lens.

7. 3.2mm high definition bugeye lens according to claim 1, it is characterised in that: the high definition bugeye lens meets: HFOV >=120 °, TTL≤17.5mm, FNO≤2.0；HFOV is horizontal field of view in formula, and TTL is optics overall length, and FNO is camera lens light Circle.