CN203241608U - Refraction/diffraction zooming infrared thermal imaging system - Google Patents
Refraction/diffraction zooming infrared thermal imaging system Download PDFInfo
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- CN203241608U CN203241608U CN 201320222479 CN201320222479U CN203241608U CN 203241608 U CN203241608 U CN 203241608U CN 201320222479 CN201320222479 CN 201320222479 CN 201320222479 U CN201320222479 U CN 201320222479U CN 203241608 U CN203241608 U CN 203241608U
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Abstract
The utility model discloses a refraction/diffraction zooming infrared thermal imaging system. The refraction/diffraction zooming infrared thermal imaging system comprises a lens, a movement assembly arranged at the tail part of the lens, and a lens group arranged in the lens. The lens group comprises six lenses, and the six lenses are separately a fixed convex-concave positive lens, a movable convex-concave negative lens, a movable double-concave negative lens, a movable convex-concave positive lens, a fixed positive meniscus lens and a movable positive meniscus lens orderly from front to back in an optical axis direction, wherein the surface facing an object side of the movable convex-concave positive lens is a binary diffractive surface, and an aperture diaphragm also can be arranged at the side facing the object side of the movable convex-concave positive lens. According to the utility model, the aberration correction becomes relatively easy.
Description
Technical field
The utility model relates to a kind of folding diffraction zoom thermal infrared imager.
Background technology
Along with the maturation of infrared uncooled detector technology, non-refrigerated thermal imager is widely used in each field, and infrared tight shot can not satisfy the use of some special occasions.Infrared continuous zoom lens can change system's focal length within the specific limits, the big or small continuous variable of image planes scenery, produce tight shot and can't reach good visual effect, can reach large visual field search target, small field of view examines the purpose of target, with military domain good application prospect is arranged civilian.
In recent years, refractive optical system is adopted in the design of some uncooled ir zoom lens more, and for the heavy caliber camera lens, the F number is little, and this has brought very large difficulty to aberration correction.
The inventor finds, utilizes the diffraction optics technology, can be in the situation that the effective aberration correction of eyeglass minimum number is realized the lightweight of heavy caliber infrared optical system.
Summary of the invention
Therefore, the purpose of this utility model is to provide a kind of folding diffraction zoom thermal infrared imager, so that aberration correction becomes relatively easy.
The technical solution adopted in the utility model is:
A kind of folding diffraction zoom thermal infrared imager, comprise camera lens and be arranged on the cartridge assemblies of camera lens afterbody and be arranged on the interior lens combination of camera lens, described lens combination comprises six eyeglasses, six eyeglasses are followed successively by fixing convex-concave positive lens from front to back at optical axis direction, convex-concave negative lens movably, double-concave negative lens movably, convex-concave positive lens movably, fixing positive meniscus lens and positive meniscus lens movably, wherein movably the convex-concave positive lens is the binary diffraction face towards the one side of thing side, and aperture diaphragm also is located at movably the convex-concave positive lens towards a side of thing.
According to the utility model, can find out from above scheme, 6 eyeglasses can guarantee the resolution of lens group self, and movably the convex-concave positive lens is the binary diffraction face towards the one side of thing side, has effectively reduced the impact of aberration, has improved image quality.Aperture diaphragm also has been located at movably, and the convex-concave positive lens has improved the relative exposure of camera lens effectively towards a side of thing side.According to said structure, cooperate the large visual field search of many eyeglasses target, small field of view examines target, so that aberration correction becomes relatively easy.
Above-mentioned folding diffraction zoom thermal infrared imager, fixing convex-concave positive lens in described 6 eyeglasses belongs to front fixedly group, movably the convex-concave negative lens and movably double-concave negative lens belong to the zoom group, movably the convex-concave positive lens belongs to the compensation group, fixing positive meniscus lens and movably positive meniscus lens belong to rear fixedly group; And the structure of four groups of lens configuration is for when infrared thermal imaging system zoom lens changes from wide-angle side to long burnt end, distance between front fixing group and the zoom group increases always, distance between zoom group and the compensation group reduces always, and compensation group and the rear fixedly distance between the group reduce first rear increase.
Above-mentioned folding diffraction zoom thermal infrared imager, described movably convex-concave negative lens, movably double-concave negative lens and movably the convex-concave positive lens be contained on the Zoom lens barrel, drive by the zoom cam mechanism, and described movably positive meniscus lens is installed in the focusing mirror holder, drives by focusing on cam mechanism.
Above-mentioned folding diffraction zoom thermal infrared imager, described movably convex-concave negative lens and movably double-concave negative lens assemble on the same zoom mirror holder and driven by the first cam path of zoom cam mechanism, movably the convex-concave positive lens then is installed on a compensation mirror holder and is driven the mechanical compensation of two cam path lift matching optics imagings by the second cam path of zoom cam mechanism.
Above-mentioned folding diffraction zoom thermal infrared imager, the infrared thermal imaging movement in the described cartridge assemblies are that spectral range is 8-14 μ m, and resolution is not less than 640 * 512 uncooled microbolometer focal plane arrays (FPA).
Description of drawings
Fig. 1 is foundation a kind of structure principle chart of rolling over diffraction zoom thermal infrared imager of the present utility model.
Fig. 2 is the middle burnt end modulation transfer function figure of the utility model embodiment.
Fig. 3 is the long burnt end relative exposure figure of the utility model embodiment.
Among the figure, 1, infrared zooming lens, 2, fixing convex-concave positive lens, 3, the zoom cam mechanism, 4, zoom cam, 5, guard shield, 6, Zoom lens barrel, 7, focus on cam mechanism, 8, infrared thermal imaging movement, 9, circuit board, 10, positive meniscus lens movably, 11, focus on mirror holder, 12, focus on cam, 13, fixing positive meniscus lens, 14, convex-concave positive lens movably, 15, the compensation mirror holder, 16, double-concave negative lens movably, 17, convex-concave negative lens movably, 18, sliding bar, 19, the zoom mirror holder.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by an embodiment, this programme is set forth.
As shown in Figure 1, illustrated a kind of heavy caliber folding diffraction zoom thermal infrared imager, focal length is 30-120mm, upper bottom profiled the best part is guard shield 5 among the figure, for the imaging system of core provides an airtight reinforced working environment.
In Fig. 1, one-piece construction also comprises infrared zooming lens 1, infrared thermal imaging movement 8 and the circuit board 9 that is installed in the guard shield 5, infrared zooming lens 1 lens group, its F number is 1.0, it comprises 6 eyeglasses, all adopt germanium material, be followed successively by from front to back fixing convex-concave positive lens 2, movably convex-concave negative lens 17 and movably double-concave negative lens 16, movably convex-concave positive lens 14, fixing positive meniscus lens 13 and positive meniscus lens 17 movably.
Meniscus shaped lens belongs to uranology (one-level subject) and astronomical instrument (secondary subject) term, and it is less by two radius-of-curvature, and numerical value differs also the crescent lens that sphere seldom consists of.Have from achromatic ability when selecting suitable thickness, produce negative power and negative spherical aberration.
Wherein movably convex-concave positive lens 14 is the binary diffraction face towards the one side of thing side, effectively to have reduced the impact of aberration, has improved image quality.Aperture diaphragm such as Fig. 1 middle part, also be located at convex-concave positive lens 14 movably on the one side of thing side, effectively improved the relative exposure of camera lens.
The infrared zooming lens 1 of 6 eyeglass compositions can change system's focal length within the specific limits, can reach large visual field search target, and small field of view examines the purpose of target.Fixing convex-concave positive lens 2 in 6 eyeglasses belongs to front fixedly group, movably convex-concave negative lens 17 and movably double-concave negative lens 16 belong to the zoom group, movably convex-concave positive lens 14 belongs to the compensation group, fixing positive meniscus lens 13 and movably positive meniscus lens 17 belong to rear fixedly group.When infrared zoom lens changed from wide-angle side to long burnt end, the distance between front fixedly group and the zoom group increased always, and the distance between zoom group and the compensation group reduces always, and compensation group and the rear fixedly distance between the group reduce first rear increase.
The zoom of camera lens realizes by zoom cam mechanism 3, and zoom cam mechanism 3 comprises zoom cam 4, the zoom transmission component that is connected with zoom cam 4, the Zoom lens barrel 6 that cooperates with zoom cam 4 inside surfaces.The zoom cam is different from the cam in the cam mechanism in the machinery, and its general performance is cam canister, has groove at the circumference of this cam canister, forms cam curve, rotates the guiding that utilizes cam curve and produces axial movement.
Be provided with two cam paths on the zoom cam 4, be provided with two straight troughs on the Zoom lens barrel 6, be used for guiding.Movably convex-concave negative lens 17 and movably double-concave negative lens 16 be fixedly mounted in the same zoom mirror holder 19, be fixed with sliding bar 18 on the zoom mirror holder 19, sliding bar 18 slides in the straight trough of the epirelief race that is flush-mounted in zoom cam 4 and Zoom lens barrel 6 and cooperates with Zoom lens barrel 6, installs also to be fixed with on the compensation mirror holder 15 of convex-concave positive lens 14 movably in the straight trough that sliding bar is slidingly mounted on the lower cam path of zoom cam 4 and Zoom lens barrel 6 in the same way and with Zoom lens barrel 6 inner chambers to cooperate.
The use of cam mechanism has improved the bearing accuracy of eyeglass, has reduced error, has improved image quality; Control two arrangement of mirrors sheets by the trend of the cam path on cam and the cam and relatively move, carry out the mechanical compensation of optical imagery, make camera lens each focal length imaging clearly in the zoom process.
The focusing of camera lens realizes by focusing cam mechanism 7, focus on cam mechanism 7 and comprise the focusing transmission component that focuses on cam 12, is connected with focusing cam 12, focus on the cam 12 and be provided with cam path, movably positive meniscus lens is fixedly mounted on and focuses on the mirror holder 11, focus on the mirror holder 11 and be fixed with sliding bar, sliding bar is slidingly mounted in the cam path that focuses on cam.
Described infrared thermal imaging movement 8 is the uncooled microbolometer focal plane arrays (FPA), and spectral range is 8-14 μ m, and resolution is 640 * 512.
Described circuit board 9 can be controlled the zoom focusing of camera lens and the image parameter of thermal imaging system.
The middle burnt end modulation transfer function figure of Fig. 2 the utility model embodiment, and its transverse axis is every millimeter demand pairs (line pair per millimeter), the longitudinal axis is contrast numerical value.Visual field, edge MTF when 40lp/mm that can find out this optical system is 0.48, and very near diffraction limit value 0.42, quality image is higher, is fit to very much cooperate high resolution infrared detector to use.
Fig. 3 is the long burnt end relative exposure figure of the utility model embodiment, and its transverse axis is the visual field size, and the longitudinal axis is the relative exposure value.Can find out that when focal length was 120mm, the relative exposure of visual field, edge had reached 93%, vignetting is very little in the process of zoom, thereby makes whole image frame more even, and the black circle of image is also not obvious.
The utility model only has six eyeglasses, all adopts germanium material, and diffraction surfaces has been made on the aspheric substrate, and structure is comparatively simple and be easy to making processing, has effectively reduced production cost.The utility model has reached 4 times of zooms, and maximum focal length can reach 120mm.The F number of the utility model zoom lens is 1.0, so relative aperture is larger, has increased light-inletting quantity, has improved image contrast.
The utility model can pass through or adopt existing techniques in realizing without the technical characterictic of describing; do not repeat them here; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example; the variation that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement also should belong to protection domain of the present utility model.
Claims (5)
1. roll over diffraction zoom thermal infrared imager for one kind, comprise camera lens and be arranged on the cartridge assemblies of camera lens afterbody and be arranged on the interior lens combination of camera lens, it is characterized in that, described lens combination comprises six eyeglasses, six eyeglasses are followed successively by fixing convex-concave positive lens (2) from front to back at optical axis direction, convex-concave negative lens (17) movably, double-concave negative lens (16) movably, convex-concave positive lens (14) movably, fixing positive meniscus lens (13) and positive meniscus lens (10) movably, wherein movably convex-concave positive lens (14) is the binary diffraction face towards the one side of thing side, and aperture diaphragm also is located at movably convex-concave positive lens (14) towards a side of thing.
2. folding diffraction zoom thermal infrared imager according to claim 1, it is characterized in that, fixing convex-concave positive lens (2) belongs to front fixedly group, movably convex-concave negative lens (17) and movably double-concave negative lens (16) belong to the zoom group, movably convex-concave positive lens (14) belongs to the compensation group, fixing positive meniscus lens (13) and movably positive meniscus lens (10) belong to rear fixedly group; And the structure of four groups of lens configuration is for when infrared thermal imaging system zoom lens changes from wide-angle side to long burnt end, distance between front fixing group and the zoom group increases always, distance between zoom group and the compensation group reduces always, and compensation group and the rear fixedly distance between the group reduce first rear increase.
3. folding diffraction zoom thermal infrared imager according to claim 1 and 2, it is characterized in that, described movably convex-concave negative lens (17), movably double-concave negative lens (16) and movably convex-concave positive lens (14) be contained on the Zoom lens barrel, drive by the zoom cam mechanism, and described movably positive meniscus lens (10) is installed in focusing mirror holder (11), drives by focusing on cam mechanism.
4. folding diffraction zoom thermal infrared imager according to claim 3, it is characterized in that, described movably convex-concave negative lens (17) and movably the same zoom mirror holder of double-concave negative lens (16) assembling (19) is upper is driven by the first cam path of zoom cam mechanism (3), movably convex-concave positive lens (14) then is installed on a compensation mirror holder (15) and is driven the mechanical compensation of two cam path lift matching optics imagings by the second cam path of zoom cam mechanism (3).
5. folding diffraction zoom thermal infrared imager according to claim 1, it is characterized in that, infrared thermal imaging movement (8) in the described cartridge assemblies is 8-14 μ m for spectral range, and resolution is not less than 640 * 512 uncooled microbolometer focal plane arrays (FPA).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320222479 CN203241608U (en) | 2013-04-27 | 2013-04-27 | Refraction/diffraction zooming infrared thermal imaging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320222479 CN203241608U (en) | 2013-04-27 | 2013-04-27 | Refraction/diffraction zooming infrared thermal imaging system |
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| CN203241608U true CN203241608U (en) | 2013-10-16 |
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| CN 201320222479 Expired - Lifetime CN203241608U (en) | 2013-04-27 | 2013-04-27 | Refraction/diffraction zooming infrared thermal imaging system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297892A (en) * | 2013-11-29 | 2015-01-21 | 中国航空工业集团公司洛阳电光设备研究所 | Zoom device of infrared thermal imager |
| CN104991332A (en) * | 2015-07-15 | 2015-10-21 | 湖北久之洋红外系统股份有限公司 | Continuous zooming non-refrigeration thermal infrared imager |
| CN107402435A (en) * | 2017-06-26 | 2017-11-28 | 北京机械设备研究所 | It is a kind of to focus infrared lens for what round-the-clock auxiliary drove |
-
2013
- 2013-04-27 CN CN 201320222479 patent/CN203241608U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297892A (en) * | 2013-11-29 | 2015-01-21 | 中国航空工业集团公司洛阳电光设备研究所 | Zoom device of infrared thermal imager |
| CN104991332A (en) * | 2015-07-15 | 2015-10-21 | 湖北久之洋红外系统股份有限公司 | Continuous zooming non-refrigeration thermal infrared imager |
| CN104991332B (en) * | 2015-07-15 | 2017-10-24 | 湖北久之洋红外系统股份有限公司 | Continuous vari-focus Uncooled infrared camera |
| CN107402435A (en) * | 2017-06-26 | 2017-11-28 | 北京机械设备研究所 | It is a kind of to focus infrared lens for what round-the-clock auxiliary drove |
| CN107402435B (en) * | 2017-06-26 | 2020-10-30 | 北京机械设备研究所 | Fixed-focus infrared lens for all-weather auxiliary driving |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131016 |
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| CX01 | Expiry of patent term |