CN205787320U - A kind of non-brake method optics is without transconversion into heat camera lens - Google Patents
A kind of non-brake method optics is without transconversion into heat camera lens Download PDFInfo
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- CN205787320U CN205787320U CN201620322917.8U CN201620322917U CN205787320U CN 205787320 U CN205787320 U CN 205787320U CN 201620322917 U CN201620322917 U CN 201620322917U CN 205787320 U CN205787320 U CN 205787320U
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- meniscus lens
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- brake method
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Abstract
The utility model discloses a kind of non-brake method optics without transconversion into heat camera lens, negative meniscus lens, positive meniscus lens and plus lens is set gradually along light direction, all can blur-free imaging and the effect without focusing in the range of 40 DEG C～+60 DEG C with realization by adjusting the focal length of F number and each lens.
Description
Technical field
This utility model relates to optical technical field, particularly relates to a kind of non-brake method optics without transconversion into heat camera lens.
Background technology
In recent years, along with the development of non-refrigeration type detector technology, non-refrigeration type detector sensitivity constantly carries
Height, and cost constantly reduces, make infrared imaging system see in night vision take aim at, the application in the field such as on-vehicle night vision and safety monitoring more comes
The most extensive.But, a shortcoming of infrared imaging system is exactly to be difficult to adapt to wider operating temperature range.Due to infra-red material
Thermal refractive index coefficient change the most greatly, along with the change of ambient temperature, the refractive index of infrared optical material, the curvature of element,
Thickness and interval will change, and add expanding with heat and contract with cold of housing, make system produce out of focus and other aberrations, have a strong impact on and be
System image quality.
Summary of the invention
In view of above-mentioned analysis, this utility model aims to provide a kind of compact non-brake method optics without transconversion into heat camera lens, in order to
Solve the problem that in prior art, temperature affects infrared imaging system image quality.
For solving the problems referred to above, this utility model is mainly achieved through the following technical solutions:
This utility model provides a kind of compact non-brake method optics without transconversion into heat camera lens, and this camera lens includes:
Negative meniscus lens, positive meniscus lens and plus lens is set gradually along light direction；
Wherein, system F number meets: 0.8≤F≤1.4, and system focal f' meets: 15mm≤f'≤50mm, and negative curved month type is saturating
The focal distance f of mirrorA' meet-300mm≤fA'≤-100mm, the focal distance f of positive meniscus lensB' meet 30mm≤fB'≤120mm,
The focal distance f of plus lensC' meet 15mm≤fC'≤60mm。
Preferably, described negative meniscus lens is the diverging meniscus lens with negative power, and described positive meniscus lens is
Having the positive meniscus lens of positive light coke, described plus lens is to have the plano-convex of positive light coke, biconvex or positive meniscus lens.
Preferably, the sphere of described negative meniscus lens and described positive meniscus lens is all towards image planes.
Preferably, the material of described negative meniscus lens is germanium, and the convex surface plating dura mater of described negative meniscus lens.Described
The material of positive meniscus lens and described plus lens is chalcogenide glass IG4 or IG6, and the trade mark pair therewith of other manufacturer production
The chalcogenide glass answered.
Preferably, condition: 0.8f'≤L≤2f' is met between optics overall length L and the system focal f' of described optical system.
Preferably, the convex surface of described negative meniscus lens is sphere or aspheric surface, and concave surface is aspheric surface or sphere；
The convex surface of described positive meniscus lens and concave surface are aspheric surface or sphere.
The surface of the both sides of described plus lens is aspheric surface or sphere, and carries in a described plus lens at least aspheric surface
There is diffraction surfaces.
Preferably, described negative meniscus lens, described positive meniscus lens and described plus lens share a lens barrel.
Preferably, described positive meniscus lens is fixed by diaphragm.
This utility model has the beneficial effect that:
This utility model optics uses aspheric surface and diffraction surfaces technology without transconversion into heat camera lens so that system structure is simple, passes through
Rate is high, and imaging performance is good, all can blur-free imaging and without focusing in the range of may be implemented in-40 DEG C～+60 DEG C.
Other feature and advantage of the present utility model will illustrate in the following description, and part from description
Become apparent, or understand by implementing this utility model.The purpose of this utility model and other advantages can be passed through
Structure specifically noted in description, claims and the accompanying drawing write realizes and obtains.
Accompanying drawing explanation
Fig. 1 is the lens construction schematic diagram of this utility model embodiment 1；
Fig. 2 is distortion and the spherical aberration curve of this utility model embodiment 1；
Fig. 3 is the room temperature optical transfer function MTF curve of this utility model embodiment 1；
Fig. 4 be this utility model embodiment 1 low temperature-40 DEG C at optical transfer function MTF curve；
Fig. 5 be this utility model embodiment 1 high temperature+60 DEG C at optical transfer function MTF curve；
Fig. 6 is distortion and the spherical aberration curve of this utility model embodiment 2；
Fig. 7 is the room temperature optical transfer function MTF curve of this utility model embodiment 2；
Fig. 8 be this utility model embodiment 2 low temperature-40 DEG C at optical transfer function MTF curve；
Fig. 9 be this utility model embodiment 2 high temperature+60 DEG C at optical transfer function MTF curve；
Detailed description of the invention
Specifically describing preferred embodiment of the present utility model below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application one
Point, and be used for explaining principle of the present utility model together with embodiment of the present utility model.For purpose of clarity and simplification, when it
When theme of the present utility model may be made smudgy, the detailed of known function and structure in device described herein will be omitted
Illustrate.
The problem affecting infrared imaging system image quality in order to solve prior art temperature, this utility model provides one
Kind compact non-brake method optics, without transconversion into heat camera lens, sets gradually negative meniscus lens, positive meniscus lens along light direction
And plus lens, all can blur-free imaging in the range of-40 DEG C～+60 DEG C with realization by adjusting the focal length of F number and each lens
And without the effect of focusing.Below in conjunction with accompanying drawing and several embodiment, this utility model is further elaborated.Should
Working as understanding, specific embodiment described herein, only in order to explain this utility model, does not limit this utility model.
This utility model embodiment provides a kind of compact non-brake method optics without transconversion into heat camera lens, sees Fig. 1, this camera lens bag
Include: set gradually negative meniscus lens 1, positive meniscus lens 2 and plus lens 3 along light direction, or be referred to as successively thoroughly
Mirror A, lens B and lens C；
Wherein, system F number meets: 0.8≤F≤1.4, and system focal f' meets: 15mm≤f'≤50mm, and negative curved month type is saturating
The focal distance f of mirror 1A' meet-300mm≤fA'≤-100mm, the focal distance f of positive meniscus lens 2B' meet 30mm≤fB'≤
120mm, the focal distance f of plus lens 3C' meet 15mm≤fC'≤60mm。
Non-brake method optics of the present utility model includes negative meniscus lens, just successively without transconversion into heat camera lens along light direction
Meniscus lens and plus lens, by adjusting the focal length of F number and each lens to realize equal energy in the range of-40 DEG C～+60 DEG C
Enough blur-free imagings and the effect without focusing.
That is, this utility model embodiment optical system uses aspheric surface and diffraction surfaces technology, and system structure is simple, transmitance
Height, imaging performance is good；And this utility model uses the design of little F number, the light collecting light ability of beneficially raising system and imaging to differentiate
Rate, improves detector sensitivity；It addition, this utility model imaging viewing field is big, be conducive to expanding range of observation, compatible many moneys
Uncooled detector.
Negative meniscus lens described in this utility model embodiment is the diverging meniscus lens with negative power, described positive bent moon
Type lens are the positive meniscus lens with positive light coke, and described plus lens is to have the plano-convex of positive light coke, biconvex or the most curved
Month lens.
And, described in this utility model embodiment, the sphere of negative meniscus lens and described positive meniscus lens is all towards picture
Face.
The material of negative meniscus lens described in this utility model embodiment is germanium, and the convex surface plating of described negative meniscus lens
Dura mater.The material of described positive meniscus lens and described plus lens is chalcogenide glass IG4 or IG6, and other manufacturer production
The chalcogenide glass that the trade mark is corresponding therewith.
This utility model negative meniscus lens front surface plating dura mater, the moisture proof of beneficially raising system, salt fog and sand and dust
Etc. the environmental suitability of aspect.And this utility model lens materials is chalcogenide glass, can produce by the way of accurate die pressing,
Batch is conducive to produce.
It should be noted that between optics overall length L of optical system described in this utility model embodiment and system focal f'
Meet condition: 0.8f'≤L≤2f'.
Preferably, the convex surface of described negative meniscus lens is sphere or aspheric surface, and concave surface is aspheric surface or sphere；Described just
The convex surface of meniscus lens and concave surface are aspheric surface or sphere.The surface of the both sides of described plus lens is aspheric surface or sphere,
And with diffraction surfaces in a described plus lens at least aspheric surface.
Preferably, described negative meniscus lens, described positive meniscus lens and described plus lens share a lens barrel.Pass through
Share a lens barrel, the coaxial precision of beneficially raising system.This utility model optical system good manufacturability, at eyeglass and lens barrel
Directly it is combined after machining meeting picture element requirement, it is not necessary to the processes such as advanced study and training, beneficially mass production.
Preferably, positive meniscus lens described in this utility model embodiment is fixed by diaphragm.It is to say, this reality
With novel only with three lens, and diaphragm is placed on before front group of positive meniscus lens, the most individually designed diaphragm, and system becomes
This is low, is conducive to improving its market competitiveness.
Fig. 1 is the lens construction schematic diagram of this utility model embodiment 1, as it is shown in figure 1, optical system of the present utility model
Focal length is 38mm, F number 1.1, and the angle of visual field is ± 12 °, optical system overall length 60.2mm, and design wavelength 8-12 μm, this system is concrete
Parameter is as shown in table 1.
Table 1 system parameter table
| Surface sequence number | Face type | Radius of curvature | Center thickness | Material |
| S1 | Sphere | 34.06 | 4.50 | Germanium |
| S2 | Aspheric surface | 30.27 | 1.00 | |
| S3 (diaphragm) | Aspheric surface | 25.44 | 11.00 | Chalcogenide glass IG4 |
| S4 | Aspheric surface | 21.14 | 12.69 | |
| S5 | Sphere | infinity | 6.00 | Chalcogenide glass IG6 |
| S6 | Aspheric surface (diffraction surfaces) | -49.55 | 21.84 | |
| Image planes | Sphere | infinity | 0 |
Rotationally symmetrical even non-spherical surface meets following equations:
In above formula, Z is aspheric surface along optical axis direction when the position that height is Y, and the rise on distance aspheric surface summit, R is
The paraxial radius of curvature of lens, K is circular cone coefficient, and A, B, C, D are high order aspheric surface coefficient.Table 2 is the aspheric surface of this embodiment
Parameter.
Table 2 aspheric surface parameter list
This diffraction surfaces meets following expression formula:
Wherein: ρ=r/r1, r1It is that diffraction surfaces returns a stroke radius, AiIt it is diffraction surfaces phase coefficient.Table 3 is the diffraction of this embodiment
Face parameter.
Table 3 diffraction surfaces parameter list
| Diffraction surfaces | Planning radius | Phase coefficient A1 |
| S6 | 16.00 | -62.31 |
Distortion and the spherical aberration curve of the present embodiment 1 optical system are as in figure 2 it is shown, it can be seen that systematical distortion value
Less than 2%, meet the use requirement of system.Fig. 3 is that the MTF curve of optical system of the present utility model is as it is shown on figure 3, this enforcement
Example 1 in temperature range is-40 DEG C～+60 DEG C, all can blur-free imaging, and without focusing.Bent at the MTF of-40 DEG C and+60 DEG C
As shown in Figure 4 and Figure 5, Fig. 3-5 is that optical system is respectively in the optical delivery of room temperature 20 DEG C, low temperature-40 DEG C and high temperature 60 DEG C to line
Function MTF curve.Optical transfer function can the image quality of concentrated expression optical system, it can be seen that in difference
At a temperature of, optical system is under spatial frequency 25mm/lp, and on axle, mtf value is more than 0.6, and the outer mtf value of axle is more than 0.3, it is possible to ensure
Optical system imaging is clear.
This utility model embodiment additionally provides another kind of lens construction, the optical system focal length of this utility model embodiment
For 40mm, F number 1.1, the angle of visual field is ± 11.6 °, optical system overall length 62mm, design wavelength 8-12 μm, this system design parameter
As shown in table 4.
Table 4 system parameter table
Rotationally symmetrical even non-spherical surface meets following equations:
In above formula, Z is aspheric surface along optical axis direction when the position that height is Y, and the rise on distance aspheric surface summit, R is
The paraxial radius of curvature of lens, K is circular cone coefficient, and A, B, C, D are high order aspheric surface coefficient.Table 5 is the aspheric surface of this embodiment
Parameter.
Table 5 aspheric surface parameter list
| K | A | B | C | D | |
| S2 | 0 | 2.9949E-07 | -1.1597E-08 | 2.7097E-11 | 0 |
| S3 | 0 | 1.1446E-06 | -2.2837E-08 | -2.5903E-11 | 1.0114E-13 |
| S4 | 0 | 1.1749E-06 | -2.7084E-08 | -4.0062E-10 | 1.3048E-12 |
| S5 | 0 | 2.3004E-06 | -3.2860E-09 | 9.3626E-13 | 0 |
This diffraction surfaces meets following expression formula:
Wherein: ρ=r/r1, r1It is that diffraction surfaces returns a stroke radius, AiIt it is diffraction surfaces phase coefficient.Table 6 is the diffraction of this embodiment
Face parameter.
Table 6 diffraction surfaces parameter list
| Diffraction surfaces | Planning radius | Phase coefficient A1 |
| S5 | 16.00 | -59.05 |
The distortion of the present embodiment 1 optical system and spherical aberration curve as shown in Figure 6, the MTF curve of optical system such as Fig. 7 institute
Show.The present embodiment 1 in temperature range is-40 DEG C～+60 DEG C, all can blur-free imaging, and without focusing.At-40 DEG C and+60
DEG C MTF curve as shown in Figure 8 and Figure 9.Fig. 7-9 is that optical system is respectively at room temperature 20 DEG C, low temperature-40 DEG C and high temperature 60 DEG C
Optical transfer function MTF curve.Optical transfer function can the image quality of concentrated expression optical system, can from figure
Going out, at different temperatures, optical system is under spatial frequency 25mm/lp, and on axle, mtf value is more than 0.6, and the outer mtf value of axle is more than
0.3, it is possible to ensure that optical system imaging is clear.
Method described in the utility model at least can bring following beneficial effect:
This utility model optics uses aspheric surface and diffraction surfaces technology without transconversion into heat camera lens so that system structure is simple, passes through
Rate is high, and imaging performance is good, all can blur-free imaging and without focusing in the range of may be implemented in-40 DEG C～+60 DEG C.
The above, only this utility model preferably detailed description of the invention, but protection domain of the present utility model is not
Being confined to this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in
Change or replacement, all should contain within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is as the criterion with the protection domain of claims.
Claims (8)
1. a non-brake method optics is without transconversion into heat camera lens, it is characterised in that including:
Negative meniscus lens, positive meniscus lens and plus lens is set gradually along light direction；
Wherein, system F number meets: 0.8≤F≤1.4, and system focal f' meets: 15mm≤f'≤50mm, negative meniscus lens
Focal distance fA' meet-300mm≤fA'≤-100mm, the focal distance f of positive meniscus lensB' meet 30mm≤fB'≤120mm, the most thoroughly
The focal distance f of mirrorC' meet 15mm≤fC'≤60mm。
Non-brake method optics the most according to claim 1 is without transconversion into heat camera lens, it is characterised in that
Described negative meniscus lens is the diverging meniscus lens with negative power, and described positive meniscus lens is for having positive light coke
Positive meniscus lens, described plus lens is to have the plano-convex of positive light coke, biconvex or positive meniscus lens.
Non-brake method optics the most according to claim 2 is without transconversion into heat camera lens, it is characterised in that
The sphere of described negative meniscus lens and described positive meniscus lens is all towards image planes.
4. according to the non-brake method optics described in any one in claim 1-3 without transconversion into heat camera lens, it is characterised in that
The material of described negative meniscus lens is germanium, and the convex surface plating dura mater of described negative meniscus lens, and described positive curved month type is saturating
The material of mirror and described plus lens is chalcogenide glass IG4 or IG6.
5. according to the non-brake method optics described in any one in claim 1-3 without transconversion into heat camera lens, it is characterised in that optical system
Optics overall length L and system focal f' between meet condition: 0.8f'≤L≤2f'.
6. according to the non-brake method optics described in any one in claim 1-3 without transconversion into heat camera lens, it is characterised in that
The convex surface of described negative meniscus lens is sphere or aspheric surface, and concave surface is aspheric surface or sphere；
The convex surface of described positive meniscus lens and concave surface are aspheric surface or sphere；
The surface of the both sides of described plus lens is aspheric surface or sphere, and with spreading out in a described plus lens at least aspheric surface
Penetrate face.
7. according to the non-brake method optics described in any one in claim 1-3 without transconversion into heat camera lens, it is characterised in that
Described negative meniscus lens, described positive meniscus lens and described plus lens share a lens barrel.
8. according to the non-brake method optics described in any one in claim 1-3 without transconversion into heat camera lens, it is characterised in that described the most curved
Month type lens are fixed by diaphragm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620322917.8U CN205787320U (en) | 2016-04-18 | 2016-04-18 | A kind of non-brake method optics is without transconversion into heat camera lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620322917.8U CN205787320U (en) | 2016-04-18 | 2016-04-18 | A kind of non-brake method optics is without transconversion into heat camera lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105824103A (en) * | 2016-04-18 | 2016-08-03 | 中国电子科技集团公司第十研究所 | Non-refrigeration optical athermalization lens |
| CN110632748A (en) * | 2019-09-06 | 2019-12-31 | 中国科学院西安光学精密机械研究所 | Modular refraction and reflection type medium wave infrared athermal lens |
-
2016
- 2016-04-18 CN CN201620322917.8U patent/CN205787320U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105824103A (en) * | 2016-04-18 | 2016-08-03 | 中国电子科技集团公司第十研究所 | Non-refrigeration optical athermalization lens |
| CN110632748A (en) * | 2019-09-06 | 2019-12-31 | 中国科学院西安光学精密机械研究所 | Modular refraction and reflection type medium wave infrared athermal lens |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161207 Effective date of abandoning: 20180626 |
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| AV01 | Patent right actively abandoned |