CN209343030U - Ultra-wide angle athermalism system - Google Patents

Abstract

The utility model relates to a kind of ultra-wide angle athermalism system, including organizing B after the bent moon negative lens A, diaphragm C and the positive lens that set gradually along object plane to image planes, group B includes biconvex positive lens B1, bent moon negative lens B2 and biconvex positive lens B3 after the positive lens.Not only structure design is simple, reasonable for the utility model, but also focal length is short, visual field is big, can cover a wide range of scenery；The depth of field is long, sizable definition range can be shown, the color difference and heat differential of system are effectively improved while system number of lenses can be reduced, realizes ultra-wide angle optics athermalism system, even aspheric surface is used in combination, preferably balances aberration, promote image quality further；The susceptibility that each optical element is reduced by the adjustment of curvature and thickness, so that the camera lens is more readily processed and adjustment.

Description

Ultra-wide angle athermalism system

Technical field

The utility model relates to a kind of ultra-wide angle athermalism systems.

Background technique

The characteristics of bugeye lens is that focal length is short, visual field is big, from a certain viewing point to scenery range exist than human eye Same viewpoint is seen much bigger；The depth of field is long, can show sizable definition range；It can emphasize the perspective effect of picture Fruit is good at exaggeration prospect and shows the far and near sense of scenery, this is conducive to the appeal for enhancing picture.And bugeye lens and its His camera lens is the same, needs to correct the distortion of picture edge appearance, and striving makes to take the picture come is not much different with material object.With red The development of outer optical technology, it is desirable that infrared system keeps working performance under different temperatures environment.But currently on the market mostly Number infrared lens field angle is both less than 100 ° or wide-angle lens cannot achieve no thermalization, and this kind of camera lens is unable to satisfy at present The demand in certain fields market.

Utility model content

In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a kind of ultra-wide angle without thermalization System, it is not only reasonable in design but also efficiently convenient.

In order to solve the above-mentioned technical problem, the technical solution of the utility model is: a kind of ultra-wide angle athermalism system, including B is organized after the bent moon negative lens A, diaphragm C and the positive lens that set gradually along object plane to image planes, group B includes double after the positive lens Convex positive lens B1, bent moon negative lens B2 and biconvex positive lens B3.

Further, the airspace of the bent moon negative lens A and diaphragm C is 8.5mm；The diaphragm C and biconvex are just saturating The airspace of mirror B1 is 3.7mm；The airspace of the biconvex positive lens B1 and bent moon negative lens B2 is 4.5mm；It is described curved The airspace of moon negative lens B2 and biconvex positive lens B3 is 0.8mm.

Compared with prior art, the utility model has the following beneficial effects: the utility model not only structure design it is simple, Rationally, and focal length is short, visual field is big, can cover a wide range of scenery；The depth of field is long, can show sizable definition range, The color difference and heat differential of system are effectively improved while system number of lenses can be reduced, and realize ultra-wide angle optics without thermalization system Even aspheric surface is used in combination in system, preferably balances aberration, promotes image quality further；It is dropped by the adjustment of curvature and thickness The low susceptibility of each optical element, so that the camera lens is more readily processed and adjustment

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

Detailed description of the invention

Fig. 1 is the optics configuration schematic diagram of the utility model embodiment.

Fig. 2 is the mtf value schematic diagram under the normal temperature environment of the utility model embodiment.

Fig. 3 is the mtf value schematic diagram under -40 DEG C of environment of low temperature of the utility model embodiment.

Fig. 4 is the mtf value schematic diagram under 80 DEG C of environment of high temperature of the utility model embodiment.

Fig. 5 is curvature of field distortion figure under the room temperature of the utility model embodiment.

In figure:

A- bent moon negative lens A；

C- diaphragm C；

B, B1- biconvex positive lens B1, B2- bent moon negative lens B2, B3- biconvex positive lens B3 are organized after B- positive lens.

Specific embodiment

In order to make the above-mentioned features and advantages of the utility model more obvious and understandable, special embodiment below, and cooperate attached drawing, It is described in detail below.

As shown in Fig. 1 ~ 5, a kind of ultra-wide angle athermalism system, the bent moon including setting gradually along object plane to image planes is born saturating Organize B after mirror A, diaphragm C and positive lens, after the positive lens group B include biconvex positive lens B1, bent moon negative lens B2 and biconvex just Lens B3.

In the utility model embodiment, the airspace of the bent moon negative lens A and diaphragm C are 8.5mm；The diaphragm The airspace of C and biconvex positive lens B1 is 3.7mm；The airspace of the biconvex positive lens B1 and bent moon negative lens B2 are 4.5mm；The airspace of the bent moon negative lens B2 and biconvex positive lens B3 is 0.8mm.

In the utility model embodiment, focal length is set as f, the optical mirror slip focal length from object plane to image planes is followed successively by f1- F4, the two have following relationship:

-3<f1/f<-1.5； 3<f2/f<5；-30<f3/f<-20；1.5<f4/f<3.

In the utility model embodiment, the specific performance parameter of the utility model is as follows:

(1) focal length: EFFL=3.0mm；

(2) number=1.2 F；

(3) field angle: 2w >=120 °；

(4) optical distortion :≤30%；

(5) imaging circular diameter is greater than Ф 8.2；

(6) operating spectral range: 8um~12um；

(7) optics overall length TTL≤38mm, optics rear cut-off distance >=8mm；

(8) camera lens is suitable for 384 × 288,17um non-brake method Long Wave Infrared Probe.

In the utility model embodiment, the utility model selection is counter to take the photograph remote structure type, and light is negative saturating by bent moon After mirror A diverging, reduces the ray tilt by organizing B after positive lens, so that it is undertaken lesser field angle, be conducive to the school of aberration Just；The design of the utility model ultra-wide angle can shoot large-scale scenery, by the reasonable selection of material and focal power distribute come Realize optics without thermalization, system can in the environment of high temperature or low temperature normal use, it is non-that which can allow 384 × 288,17um Refrigeration long-wave infrared detector uses.

In the utility model embodiment, the utility model is made of four eyeglasses, reasonably select material and distribution light focus Degree, comes balance system aberration and heat differential in conjunction with even aspheric surface, so that optical system simplifies the structure, reaches the same of ultra-wide angle Shi Shixian is without thermalized design；By the correction to marginal distortion, control distortion is within the scope of reasonable；Pass through curvature and thickness Adjustment reduce the susceptibility of each optical element so that the utility model is more readily processed and adjustment.

In the utility model embodiment, this optical texture parallel flat is located between biconvex positive lens B3 and IMA, the mirror The advantage of head having has: focal length is short, visual field is big, can cover a wide range of scenery；The depth of field is long, can show sizable clear Clear range；Using the Thermal property differences between different materials, and reasonable distribution focal power, the same of system number of lenses can be reduced When effectively improve the color difference and heat differential of system, realize ultra-wide angle optics athermalism system；Even aspheric surface is used in combination, preferably Ground balance aberration promotes image quality further；The susceptibility of each optical element is reduced by the adjustment of curvature and thickness, so that The camera lens is more readily processed and adjustment.

In the utility model embodiment, light successively passes through bent moon negative lens A, biconvex positive lens B1, bent moon negative lens It is imaged after B2 and biconvex positive lens B3.

In the utility model embodiment, the parameter of above-mentioned eyeglass is as shown in the table.

In the utility model embodiment, aspherical related data is as shown in the table.

In the utility model embodiment, aspherical expression formula are as follows:

Z represents the position of optical axis direction, and r represents the height in the vertical direction of opposite optical axis, and c represents radius of curvature, k generation Table circular cone coefficient,Represent asphericity coefficient.In aspherical surface data, E-n representative "", example As 4.525E-005 is represented。

In the utility model embodiment, the utility model resolution ratio with higher it can be seen from attached drawing 2 meets The biography of 384 × 288,17um uncooled detector needs to ask；By attached drawing 3, attached drawing 4 it is found that the utility model is in high temperature and low temperature In the environment of MTF basically no attenuation, realize the optics of camera lens without thermalization performance；By attached drawing 5 it is found that the utility model meet it is abnormal Become and requires.

For indicating the art of positional relationship or shape applied in above-mentioned any technical solution disclosed by the utility model Its meaning includes approximate with its, similar or close state or shape to language unless otherwise stated.

Either component provided by the utility model by multiple individual component parts either assembled, or The separate part that integrally formed technique manufactures.

Above embodiments are only to illustrate the technical solution of the utility model rather than its limitations；Although implementing referring to preferable The utility model is described in detail in example, it should be understood by those ordinary skilled in the art that: still can be to this reality It is modified with novel specific embodiment or some technical features can be equivalently replaced；Without departing from the utility model The spirit of technical solution should all be covered within the scope of the technical scheme claimed by the utility model.

Claims (2)

1. a kind of ultra-wide angle athermalism system, it is characterised in that: including the bent moon negative lens set gradually along object plane to image planes A, B is organized after diaphragm C and positive lens, group B includes that biconvex positive lens B1, bent moon negative lens B2 and biconvex are just saturating after the positive lens Mirror B3.

2. ultra-wide angle athermalism system according to claim 1, it is characterised in that: the bent moon negative lens A's and diaphragm C Airspace is 8.5mm；The airspace of the diaphragm C and biconvex positive lens B1 is 3.7mm；The biconvex positive lens B1 with it is curved The airspace of moon negative lens B2 is 4.5mm；The airspace of the bent moon negative lens B2 and biconvex positive lens B3 is 0.8mm.