CN208013512U - A kind of big thang-kng zero temp shift optical textures of uniform thickness 3mm - Google Patents

Abstract

The utility model is related to a kind of big thang-kng zero temp shift optical textures of uniform thickness 3mm, include along light incident direction is set gradually from left to right preceding group of eyeglass A, diaphragm C and rear group eyeglass B, it includes bent moon negative lens A1, double-concave negative lens A2 and the biconvex positive lens A3 set gradually from left to right to organize eyeglass A before described；Group eyeglass B includes the bent moon positive lens B1 set gradually from left to right, touches the gluing unit constituted, biconvex positive lens B4 by biconvex positive lens B2 and bent moon negative lens B3 after described.The structure design of the utility model is reasonable, thang-kng amount is big, susceptibility is small, and day and night defocus is small, and the image quality under high/low temperature condition is improved, and is truly realized zero temp shift.

Description

A kind of big thang-kng zero temp shift optical textures of uniform thickness 3mm

Technical field：

The utility model is related to a kind of big thang-kng zero temp shift optical textures of uniform thickness 3mm.

Background technology：

Camera lens is the important component of security monitoring video camera, and security lens are more via early stage by development for many years The low-end products such as eyeglass, assembly difficulty are high, optical index is low are gradually transitions economical high target security lens.But current city On field most of camera lenses still have thang-kng amount is small, day and night defocus is big, height temperature sensitive, the problems such as illumination is low.This kind of camera lens is matched Video camera is closed in use, it is difficult to really realizing high-resolution and day and night confocal.

Utility model content：

The purpose of this utility model is that being directed to the above shortcoming, a kind of big thang-kng zero temp shift optics of uniform thickness 3mm is provided Structure, not only reasonable in design, thang-kng amount is big, susceptibility is small, day and night defocus is small, and can realize high-resolution.

To achieve the goals above, the technical solution adopted in the utility model is：A kind of big thang-kng zero temp shift light of uniform thickness 3mm Learn structure, include along light incident direction is set gradually from left to right preceding group of eyeglass A, diaphragm C and rear group eyeglass B, it is described Preceding group of eyeglass A includes bent moon negative lens A1, double-concave negative lens A2 and the biconvex positive lens A3 set gradually from left to right；It is described Group eyeglass B includes the bent moon positive lens B1 set gradually from left to right, by biconvex positive lens B2 and bent moon negative lens B3 contiguity afterwards The gluing unit of composition, biconvex positive lens B4.

Further, the airspace of the preceding group eyeglass A and rear group eyeglass B are 2.7mm.

Further, the airspace between the bent moon negative lens A1 and double-concave negative lens A2 is 3.2mm, the concave-concave Airspace between negative lens A2 and biconvex positive lens A3 is 0.9mm；The bent moon positive lens B1 with by biconvex positive lens B2 Airspace between the gluing unit of bent moon negative lens B3 contiguity compositions is 0.1mm, negative saturating by biconvex positive lens B2 and bent moon The airspace of gluing unit and biconvex positive lens B4 that mirror B3 contiguity is constituted is 0.1mm.

Further, the distance of the biconvex positive lens A3 to diaphragm C is 0.1mm, the diaphragm C to bent moon positive lens B1 Distance be 2.6mm.

Further, parallel flat is set between the biconvex positive lens B4 and IMA image planes.

Compared with prior art, the utility model has the following effects that：

（1）The structure design of the utility model is reasonable, and not only thang-kng amount is big, susceptibility is small, day and night defocus is small, but also with height Resolution ratio, can under high temperature and low temperature normal use；

（2）The utility model uses seven slice structures, reasonable distribution focal power, preceding group of eyeglass to be restrained using three-chip type The incidence angle of light, rear eyeglass of organizing carry out aberration balancing using four-piece type, maximum chief ray incidence angles are made to maintain lower water It is flat, it ensure that lower color distortion degree, provide more uniform illumination for image planes；

（3）By the adjustment of curvature and material, preferably balances senior aberration, image quality is made further to be promoted so that night Visual effect fruit is improved；Simultaneously so that the image quality under high/low temperature condition is improved, it is truly realized zero temp shift.

Description of the drawings：

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

Fig. 2 is the MTF functional values in the utility model embodiment under visible light；

Fig. 3 is MTF functional values under the conditions of 850nm night visions in the utility model embodiment；

Fig. 4 is to spend the mtf value under environment in low temperature -30 in the utility model embodiment；

Fig. 5 is the MTF functional values under 70 degree of environment of high temperature in the utility model embodiment.

In figure：

Eyeglass A is organized before A-；A1- bent moon negative lenses A1；A2- double-concave negative lens A2；A3- biconvex positive lens A3；C- diaphragms C； Eyeglass B is organized after B-；B1- bent moon positive lens B1；B2- biconvex positive lens B2；B3- bent moon negative lenses B3；B4- biconvex positive lens B4； D- parallel flats.

Specific implementation mode:

The utility model is described in more detail with reference to the accompanying drawings and detailed description.

As shown in Figure 1, a kind of big thang-kng zero temp shift optical textures of uniform thickness 3mm of the utility model, including it is past from a left side along light Preceding group of eyeglass A, diaphragm C that right incident direction is set gradually and rear group eyeglass B, it is described before group eyeglass A include from left to right according to Bent moon negative lens A1, double-concave negative lens A2 and the biconvex positive lens A3 of secondary setting；After described group eyeglass B include from left to right according to The bent moon positive lens B1 of secondary setting, the gluing unit constituted, biconvex positive lens are touched by biconvex positive lens B2 and bent moon negative lens B3 B4。

In the present embodiment, it is 2.7mm that eyeglass A and the airspace of rear group eyeglass B are organized before described.

In the present embodiment, the airspace between the bent moon negative lens A1 and double-concave negative lens A2 is 3.2mm, described double Airspace between recessed negative lens A2 and biconvex positive lens A3 is 0.9mm；The bent moon positive lens B1 with by biconvex positive lens Airspace between the gluing unit that B2 and bent moon negative lens B3 contiguity are constituted is 0.1mm, is born by biconvex positive lens B2 and bent moon The airspace of gluing unit and biconvex positive lens B4 that lens B3 contiguity is constituted is 0.1mm.

In the present embodiment, the distance of the biconvex positive lens A3 to diaphragm C is 0.1mm, the diaphragm C to bent moon positive lens The distance of B1 is 2.6mm.

In the present embodiment, parallel flat D is set between the biconvex positive lens B4 and IMA image planes.

In the present embodiment, in optical design, focal length is set as f, bent moon negative lens A1, double-concave negative lens A2, biconvex are just Lens A3, bent moon positive lens B1, biconvex positive lens B2, bent moon negative lens B3 and the corresponding focal lengths of biconvex positive lens B4 are respectively F1, f2, f3, f4, f5, f6, f7, between proportionate relationship it is as follows：

-3.5<f1/f<-2.1；

-2.5<f2/f<-1.5；

-2.9<f3/f<-1.8；

-8.5<f4/f<-7.5；

3.5<f5/f<-2.6；

-5.6<f6/f<-4.8；

-4.3<f7/f<-3.7。

It is the bent moon negative lens A1, double-concave negative lens A2, biconvex positive lens A3, bent moon positive lens B1, double in the present embodiment Convex positive lens B2, bent moon negative lens B3 and biconvex positive lens B4 are glass spherical lens, and preceding group of eyeglass A uses three-chip type knot Structure is conducive to restrain incidence angle, while the lens in preceding group of eyeglass A can effectively reduce advanced picture using the material of high index Difference；Four lens in group eyeglass B use the material compared with high Abbe number, the low Abbe material for negative film of arranging in pairs or groups that can effectively reduce afterwards The introducing of aberration so that day and night confocal under the conditions of uniform thickness is achieved, and is realized by the rule of temperature-compensating between eyeglass Zero temp shift.The optical texture is also distributed by rational focal power, and preferable aberration balancing can be obtained, and makes entire camera lens susceptibility Decline；The parameter such as following table of specific each eyeglass：

In the present embodiment, the achievable technical indicator of the optical texture is as follows：

（1）Focal length：EFFL=3mm；

（2）Number=1.2 F；

（3）Field angle：2w≥137°；

（4）Optical distortion：< -18%；

（5）It is imaged circular diameter and is more than Ф 6.6；

（6）Operating spectral range：480nm~850nm；

（7）Optics overall length TTL≤23.7mm, optics rear cut-off distance >=5.7mm；

（8）The camera lens is suitable for 3,000,000 pixel high-resolution CCD or cmos camera.

In the present embodiment, there is higher resolution ratio using the optical texture it can be seen from Fig. 2, Fig. 3, meet 3,000,000 The biography of pixel CMOS chip needs to ask, and night vision effect is good；By Fig. 4, Fig. 5 it is found that the camera lens is in the environment of high temperature and low temperature MTF decaying very littles, realize the zero temp shift performance of camera lens substantially.

The above is only the preferred embodiment of the present invention, it is all done according to present utility model application the scope of the claims it is equal Deng variation and modification, it should all belong to the covering scope of the utility model.

Claims (2)

1. a kind of big thang-kng zero temp shift optical textures of uniform thickness 3mm, it is characterised in that：Including along light from left to right incident direction according to Preceding group of eyeglass A, the diaphragm C of secondary setting and rear group eyeglass B, it includes the bent moon set gradually from left to right to organize eyeglass A before described Negative lens A1, double-concave negative lens A2 and biconvex positive lens A3；Group eyeglass B includes the bent moon set gradually from left to right after described Positive lens B1, the gluing unit constituted, biconvex positive lens B4 are touched by biconvex positive lens B2 and bent moon negative lens B3；Mirror is organized before described Piece A and the airspace of rear group eyeglass B are 2.7mm；Airspace between the bent moon negative lens A1 and double-concave negative lens A2 For 3.2mm, the airspace between the double-concave negative lens A2 and biconvex positive lens A3 is 0.9mm；The bent moon positive lens B1 It is 0.1mm with the airspace between the gluing unit constituted is touched by biconvex positive lens B2 and bent moon negative lens B3, just by biconvex The airspace for the gluing unit and biconvex positive lens B4 that lens B2 and bent moon negative lens B3 contiguity are constituted is 0.1mm；The biconvex The distance of positive lens A3 to diaphragm C is 0.1mm, and the distance of the diaphragm C to bent moon positive lens B1 is 2.6mm.

2. the big thang-kng zero temp shift optical textures of a kind of uniform thickness 3mm according to claim 1, it is characterised in that：The biconvex Parallel flat is set between positive lens B4 and IMA image planes.