CN103197405B - Near-infrared band athermalization optical lens - Google Patents
Near-infrared band athermalization optical lens Download PDFInfo
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- CN103197405B CN103197405B CN201310122964.9A CN201310122964A CN103197405B CN 103197405 B CN103197405 B CN 103197405B CN 201310122964 A CN201310122964 A CN 201310122964A CN 103197405 B CN103197405 B CN 103197405B
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Abstract
The invention discloses a near-infrared band athermalization optical lens. A Pizvan structural style is adopted, and a working wave band of the Pizvan structural style is 0.72 mu m to 1.0 mu m. The temperature range of the working environment is 45 DEG C to 60 DEG C. The structure is that along the light path incidence direction, an aperture diaphragm, a first lens, a second lens, a third lens, a fourth lens and a fifth lens are respectively arranged, and refractive indexes corresponding to the lenses respectively are n1 is equal to 1.552, n2 is equal to 1.755, n3 is equal to 1.618, and both n4 and n5 are equal to 1.755. A first dual-agglutination lens group is formed by the first lens and the second lens, and a second dual-agglutination lens group is formed by the third lens and the fourth lens. The value ranges of focal power normalization of the two dual-agglutination lens groups and the fifth lens respectively are phi1 which is bigger than 0 and smaller than 0.5, phi2 which is bigger than 1 and smaller than 1.5 and phi3 which is bigger than minus 1.5 and smaller minus 1. The lens is simple in structure, high in imaging quality and capable of maintaining good imaging performance under wide temperature changes.
Description
Technical field
The present invention relates to one and be operated in near-infrared band optical lens, particularly one work in 0.72 μm ~ 1.0 mu m wavebands disappear heat difference optical lens, it can in-45 DEG C ~ 60 DEG C ambient temperature ranges blur-free imaging.
Background technology
Optical lens often works in complicated temperature changing environment, the change of temperature can cause optical material variations in refractive index, ray machine material deformation, finally cause camera lens image planes that hot out of focus occurs, image quality decline, this by temperature variation cause the difference of image quality be called heat poor.For the image quality obtained under wide temperature changing environment, optical lens need carry out the heat difference research & design that disappears.At present, the hot difference method that disappears mainly contains dynamo-electric active, mechanical passive type and optical passive mode.Wherein PASSIVE OPTICAL disappears, and to realize the camera lens heat that disappears by the heat difference performance of matching optics and structured material poor for hot difference method, has that weight is little, idle, reliability high, becomes optical system and to disappear the prefered method that heat differs from.
Before making the present invention, publication number is that the Chinese invention patent of CN102213821A discloses a kind of near-infrared camera lenses, and this camera lens comprises four arrangement of mirrors sheets from the object side to the image side successively along optical axis, and the first eyeglass is the falcate eyeglass of negative power, convex surface facing object space, adopt aspheric surface; Second eyeglass is the falcate eyeglass of plus or minus focal power, convex surface facing image space; 3rd eyeglass is lenticular, convexo-plane or the falcate eyeglass of positive light coke, when plano-convex or falcate, convex surface facing object space; 4th eyeglass is the eyeglass of positive light coke, adopts aspheric surface.The eyeglass of this camera lens mostly is employing aspherical mirror machining, and difficulty is large, and cost is high.At present, adopt optical passive mode to disappear hot difference method, provide a kind of and work in near-infrared band and the optical lens that eyeglass face type is spherical mirror has no report.
Summary of the invention
The object of the invention is to overcome the deficiency that prior art exists, provide a kind of thermal adaptability strong, effectively can eliminate the optical lens working in visible near-infrared wave band that influence of temperature change, structure are simple, with low cost.
The technical scheme realizing the object of the invention is to provide a kind of near-infrared band and disappears heat difference optical lens, and adopt hereby ten thousand structural shapes, its service band is 0.72 μm ~ 1.0 μm; Operating ambient temperature range is-45 DEG C ~ 60 DEG C; Comprise two groups of cemented doublets and one group of simple lens, their optical surface is sphere; Its structure is: along light path incident direction, be followed successively by aperture diaphragm, first piece of lens, its refractive index n
1=1.552, second piece of lens, its refractive index n
2=1.755, three piece of lens, its refractive index n
3=1.618, four piece of lens and the 5th piece of lens, refractive index n
4=n
5=1.755; Wherein, first piece of lens and second piece of lens form first group pair and glue together mirror group, and the 3rd piece of lens and the 4th piece of lens form second group pair and glue together mirror group; Two groups of two gummed mirror groups and the 5th piece of power of lens are followed successively by Φ
1, Φ
2, Φ
3, normalized span is 0< Φ
1<0.5,1< Φ
2<1.5 ,-1.5< Φ
3<-1.
Compared with prior art, feature of the present invention is: adopt hereby ten thousand structural shapes, by the thermal expansivity of the temperature variation (dn/dt) of matching optics Refractive Index of Material, optics and mechanical material, compensate the hot defocusing amount that each factor causes, make the image quality that optical system has kept in the working environment that range of temperature is larger; Visible ray near-infrared band provided by the invention disappears heat difference optical lens, and its optical surface is sphere, has structure simple, image quality high; Adopt optics to disappear hot difference method, under wide temperature variation, there is good imaging performance, all have wide application prospects in military project and civil area.
Accompanying drawing explanation
Fig. 1 to disappear the structural representation of heat difference optical lens for visible ray near-infrared band that the embodiment of the present invention provides;
The distortion curve figure of the optical lens that Fig. 2 provides for the embodiment of the present invention;
The relative exposure curve of the optical lens that Fig. 3 provides for Ben Fanming embodiment;
The optical lens that Fig. 4 provides for the embodiment of the present invention is modulation transfer function curve map 60 DEG C time;
The optical lens that Fig. 5 provides for the embodiment of the present invention is modulation transfer function curve map 20 DEG C time;
The optical lens that Fig. 6 provides for the embodiment of the present invention is modulation transfer function curve map-20 DEG C time;
The optical lens that Fig. 7 provides for the embodiment of the present invention is modulation transfer function curve map-45 DEG C time;
In Fig. 1: 1, along first piece of lens of light path incident direction; 2, along second piece of lens of light path incident direction; 3, along the 3rd piece of lens of light path incident direction; 4, along the 4th piece of lens of light path incident direction; 5, along the 5th piece of lens of light path incident direction.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is further elaborated.
Embodiment 1
The present embodiment is by the thermal expansivity of the temperature variation (dn/dt) of matching optics Refractive Index of Material, optics and mechanical material, compensate the hot defocusing amount that each factor causes, make the image quality that optical system has kept in the working environment that range of temperature is larger.Optics athermal design need meet formula (1) ~ (3) three equations, is respectively focal power distribution equations, achromatism equation and the hot eikonal equation that disappears:
（1）
（2）
（3）
Wherein φ
ifor power of lens, h
ifor the height of incidence of paraxial rays on lens, φ is total focal power.C in formula
iit is the chromatic aberration coefficient of i-th lens.T in formula
ibe the heat difference coefficient of i-th lens, α
lfor the thermal expansivity of lens barrel material, L is the total length of lens barrel structure.By solving above-mentioned equation, carry out optimized design.
The technical scheme of the present embodiment is to provide a kind of visible ray near infrared and disappears heat difference optical lens, and its design parameter is: service band is 0.72 μm ~ 1.0 μm, and focal length is 52.8mm, and full filed angle is 5 °, and F number is 2.
See accompanying drawing 1, it is the structural representation of the optical lens described in the present embodiment.Can be seen by Fig. 1, be made up of two groups of cemented doublets and one group of simple lens, along light path incident direction, be aperture diaphragm respectively, first piece of lens, 1, second piece of lens 2, the 3rd piece of lens 3, the 4th piece of lens 4 and the 5th piece of lens 5; Wherein first piece of lens 1 and second piece of lens 2 form first group and twoly glue togethers mirror group, and the 3rd piece of lens 3 and the 4th piece of lens 4 form second group pair and glue together mirror group.
The concrete data of the visible near-infrared heat difference optical lens each lens subassembly that disappears that the present embodiment provides and the material of employing as shown in table 1.
Table 1
The focal power of three groups of refracting set is followed successively by Φ
1, Φ
2, Φ
3,
Normalization value is Φ
1=0.34, Φ
2=1.075, Φ
3=-1.35.
See accompanying drawing 2, it is the hot distortion curve figure differing from optical lens that disappears described in the present embodiment, and in figure, horizontal ordinate is relative distortion value (unit %), and ordinate is normalization visual field, and as seen from Figure 2, relative distortion is less than 0.3%, can ensure that imaging can not distortion.
See accompanying drawing 3, it is the hot relative exposure curve differing from optical lens that disappears described in the present embodiment, and in figure, horizontal ordinate is visual field, and ordinate is for contrasting angle value, and as seen from the figure, the angle value that contrasts of infrared system is greater than 98.1%.
See accompanying drawing 4 ~ 7, it is the modulation transfer function curve map of the optical lens visible near-infrared system under environment temperature is respectively 60 DEG C, 25 DEG C ,-10 DEG C ,-45 DEG C conditions described in the present embodiment.From above each figure, be all greater than 0.58 at the mtf value at nyquist frequency 90lp/mm place.
Claims (1)
1. near-infrared band disappears a heat difference optical lens, adopts hereby ten thousand structural shapes, it is characterized in that: its service band is 0.72 μm ~ 1.0 μm; Operating ambient temperature range is-45 DEG C ~ 60 DEG C; Comprise two groups of cemented doublets and one group of simple lens, their optical surface is sphere; Its structure is: along light path incident direction, be followed successively by aperture diaphragm, first piece of lens, its refractive index n
1=1.552, second piece of lens, its refractive index n
2=1.755, three piece of lens, its refractive index n
3=1.618, four piece of lens and the 5th piece of lens, refractive index n
4=n
5=1.755; Wherein, first piece of lens and second piece of lens form first group pair and glue together mirror group, and the 3rd piece of lens and the 4th piece of lens form second group pair and glue together mirror group; Two groups of two gummed mirror groups and the 5th piece of power of lens are followed successively by Φ
1, Φ
2, Φ
3, Φ
1be 0.34, Φ
2be 1.075, Φ
3for-1.35.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310122964.9A CN103197405B (en) | 2013-04-10 | 2013-04-10 | Near-infrared band athermalization optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310122964.9A CN103197405B (en) | 2013-04-10 | 2013-04-10 | Near-infrared band athermalization optical lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103197405A CN103197405A (en) | 2013-07-10 |
| CN103197405B true CN103197405B (en) | 2015-03-25 |
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ID=48720079
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310122964.9A Expired - Fee Related CN103197405B (en) | 2013-04-10 | 2013-04-10 | Near-infrared band athermalization optical lens |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297899B (en) * | 2013-11-29 | 2017-01-25 | 中国航空工业集团公司洛阳电光设备研究所 | Large-view-field passive athermalization shortwave infrared optical system |
| CN108107554B (en) * | 2017-12-27 | 2020-10-02 | 天津津航技术物理研究所 | Distributed optical wedge scanning medium wave infrared athermal imaging lens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4435341B2 (en) * | 1999-09-13 | 2010-03-17 | 日東光学株式会社 | Infrared lens |
| CN102183836B (en) * | 2011-05-14 | 2012-09-19 | 苏州大学 | Infrared double-waveband athermalization optical lens |
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2013
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Granted publication date: 20150325 Termination date: 20190410 |