CN103823294A - Continuous zooming medium wave infrared optics system with super-long focal length - Google Patents
Continuous zooming medium wave infrared optics system with super-long focal length Download PDFInfo
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- CN103823294A CN103823294A CN201410061080.1A CN201410061080A CN103823294A CN 103823294 A CN103823294 A CN 103823294A CN 201410061080 A CN201410061080 A CN 201410061080A CN 103823294 A CN103823294 A CN 103823294A
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Abstract
The invention relates to a continuous zooming medium wave infrared optics system with super-long focal length. A varifocus objective group comprises a main objective, a zooming lens, a compensating lens, a first fixing lens and a second fixing lens. A reflecting lens group comprises a first reflecting lens and a second reflecting lens. A secondary imaging back group comprises a first back group lens, a second back group lens and a third back group lens. The varifocus objective group carries out converging imaging on light from an object, the imaging face is between the first reflecting lens and the second reflecting lens. The first back group lens, the second back group lens and the third back group lens carry out imaging again on an image formed by the varifocus objective group to a final image face. The continuous zooming medium wave infrared optics system has the main advantages that image face object size can be changed continuously, a target is not lost during imaging at any focal length position from a short focus to a long focus, action distance is long, target detail observing capacity is high, imaging quality is high, aberration correction is good, imaging is clear and sharp in the whole course of zooming, the compensating lens also has a focusing function, the number of moving units is reduced, the system structure is simplified, and equipment reliability is improved.
Description
Technical field
The continuous vari-focus medium-wave infrared optical system that the present invention relates to have overlength focal length, is widely used in refrigeration-type medium-wave infrared focus planardetector.
Background technology
Infrared imaging system is with the good characteristics of himself, as passive working method, and can be by enemy's electronic interferences, good concealment; Image is directly perceived, is easy to observe; Precision is high; Low-altitude detection performance is good etc., in the military fields such as warning, scouting, ground air defense and guidance, is widely applied.In recent years, along with the continuous expansion of tremendous development and the range of application thereof of infrared optics technology, the demand of infrared continuous zooming optical system is strengthened day by day.This is can realize focal length and continuously change within the specific limits due to infrared continuous zooming optical system, and image planes are stable and keep good picture element in zoom process, thereby realize the big or small continuous variable of image planes scenery, produce tight shot and the many grades of zoom lens visual effect that is beyond one's reach, can reach large visual field search target, small field of view examines the object of target, and can lose objects in the handoff procedure of visual field.In order to improve, infrared equipment is found and the ability of identification target, wishes that toward contact optical system can have longer focal length.But because long-focus continuous vari-focus infrared optical system focal length is long, bore is large, aberration is difficult for proofreading and correct, and the continuous vari-focus in large focal range is realized difficulty, also will meet the 100% cold stop designing requirement of medium wave refrigeration detector, and eliminate the parasitic lights such as cold emission, its realization is very difficult.
Summary of the invention
The object of the invention is to, overcome the shortcoming of prior art, propose a continuous vari-focus medium-wave infrared optical system with overlength focal length.This system continuous vari-focus, the big or small continuous variable of image planes scenery, short focal length is used for searching for discovery target, long-focus is for target identification identification, the shortest Jiao to any focal position imaging of the longest Jiao, can lose objects in focal length variations process; Longest focal length reaches 1100mm, and operating distance is far away, and target detail observation ability is strong; Good imaging quality, aberration correction is good, and the omnidistance imaging clearly of zoom is sharp keen; Compensating glass has focusing function concurrently, has reduced moving cell, has simplified system architecture, has improved equipment dependability.
Technical scheme of the present invention is:
Have a continuous vari-focus medium-wave infrared optical system for overlength focal length, order comprises from the object side to the image side: group after varifocus objective group, catoptron group and secondary imaging; Described varifocus objective group comprises principal goods mirror, zoom mirror, compensating glass, the first fixed lens and the second fixed lens; Catoptron group comprises the first catoptron and the second catoptron; After secondary imaging, group comprises first rear group of lens, second rear group of lens and three rear group of lens; Described zoom mirror and compensating glass move on same optical axis, for continuous vari-focus; The light from object space is pooled picture by varifocus objective group, and imaging surface is between the first catoptron and the second catoptron; Varifocus objective group imaging re-imaging is arrived final image planes by first rear group of lens, second rear group of lens and three rear group of lens.
Further technical scheme is:
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, its aperture F is 4.0, and wave band is 3～5 μ m, and focal range is 88～1100mm.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, principal goods mirror, zoom mirror, compensating glass, the first fixed lens, the second fixed lens, first rear group of lens, second rear group of lens and three rear group of lens are respectively 1, have 8 lens; The first catoptron and the second catoptron are respectively 1, totally 2 catoptrons.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, the focal power of its principal goods mirror, zoom mirror, compensating glass, the first fixed lens, the second fixed lens is assigned as Negative-Positive-Negative-negative-positive structure.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, the lens material of its principal goods mirror, zoom mirror, compensating glass, the first fixed lens and the second fixed lens is respectively silicon, germanium, silicon, zinc selenide, silicon.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, these four lens of its principal goods mirror, compensating glass, the first fixed lens and the second fixed lens are spherical lens; Zoom mirror is the saturating border of the diffraction surfaces of aspheric substrate, for correcting chromatic aberration.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, its first catoptron is installed with optical axis angle at 45 ° in light path, for light path being turned back to 90 °; The second catoptron is installed at an angle of 90 with respect to the first catoptron in light path, and for again light path being turned back 90 °, light path is turned back 180 ° the most at last.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, its first rear group of lens, second rear group of lens and three rear group of power of lens are Negative-Positive-Negative structure.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, its first rear group of lens, second rear group of lens and three rear group of lens material are respectively silicon, germanium, silicon.
The described continuous vari-focus medium-wave infrared optical system with overlength focal length, its first rear group of lens, three rear group of these two lens of lens are spherical lens; Second rear group of lens is non-spherical lens, for improving image quality.
The aperture diaphragm that the present invention has a continuous vari-focus medium-wave infrared optical system of overlength focal length is arranged on the cold stop position of detector, to meet 100% cold stop efficiency requirement, the parasitic light of avoiding the hot backgrounds such as lens barrel to produce enters detector, improve the signal to noise ratio (S/N ratio) of output image, and be provided with detector focal plane at the image planes place of optical system of the present invention.
The present invention has the following advantages:
1, realized continuous vari-focus, the big or small continuous variable of image planes scenery, short focal length is used for searching for discovery target, and long-focus is for target identification identification, can be the shortest Jiao to any focal position imaging of the longest Jiao, can lose objects in focal length variations process;
2, longest focal length reaches 1100mm, and operating distance is far away, and target detail observation ability is strong;
3, good imaging quality, adopt the combination collocation of aspheric surface, diffraction surfaces and multiple infrared optical material, aberration correction is good, obtain the good image quality that approaches diffraction limit, have that focal length is long, bore large (φ 280), focal range (88～1100mm) is large, zoom curve smoothing, omnidistance clear sharp keen effect;
4, compensating glass has focusing function concurrently, has reduced moving cell, has simplified system architecture, has improved equipment dependability.
Accompanying drawing explanation
Fig. 1 is that the present invention is adjusted to short structural representation when burnt;
Fig. 2 is that the present invention is adjusted to middle structural representation when burnt;
Fig. 3 is that the present invention is adjusted to the structural representation while growing Jiao;
Imaging when Fig. 4 is short Jiao of the present invention passes letter figure;
Imaging when Fig. 5 is burnt in the present invention passes letter figure;
Imaging when Fig. 6 is long Jiao of the present invention passes letter figure.
In figure, Reference numeral name is called: A-varifocus objective group, B-catoptron group, group after C-secondary imaging; 1-principal goods mirror, 2-zoom mirror, 3-compensating glass, 4-the first fixed lens, 5-the second fixed lens; 6-the first catoptron, 7-the second catoptron; First rear group of lens of 8-, second rear group of lens of 9-, three rear group of lens of 10-; 11-detector.
Embodiment
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of continuous vari-focus medium-wave infrared optical system with overlength focal length of the present invention, order comprises from the object side to the image side: after varifocus objective group A, catoptron group B and secondary imaging, organize C; Described varifocus objective group A comprises principal goods mirror 1, zoom mirror 2, compensating glass 3, the first fixed lens 4 and the second fixed lens 5; Catoptron group B comprises the first catoptron 6 and the second catoptron 7; After secondary imaging, organize C and comprise first rear group of lens 8, second rear group of lens 9 and three rear group of lens 10; Described zoom mirror 2 and compensating glass 3 move on same optical axis, for continuous vari-focus; The light from object space is pooled picture by varifocus objective group A, and imaging surface is between the first catoptron 6 and the second catoptron 7; First rear group of lens 8, second rear group of lens 9 and three rear group of lens 10 to final image planes, on the focal plane of detector 11, and are born the function of correct residual aberration by varifocus objective group A imaging re-imaging, realize good picture element.Optical system of the present invention, its aperture F is 4.0, and wave band is 3～5 μ m, and focal range is 88～1100mm.Described principal goods mirror 1, zoom mirror 2, compensating glass 3, the first fixed lens 4, the second fixed lens 5, first rear group of lens 8, second rear group of lens 9 and three rear group of lens 10 are respectively 1, have 8 lens; The first catoptron 6 and the second catoptron 7 are respectively 1, totally 2 catoptrons.The focal power of described principal goods mirror 1, zoom mirror 2, compensating glass 3, the first fixed lens 4, the second fixed lens 5 is assigned as Negative-Positive-Negative-negative-positive structure.The lens material of principal goods mirror 1, zoom mirror 2, compensating glass 3, the first fixed lens 4 and the second fixed lens 5 is respectively silicon, germanium, silicon, zinc selenide, silicon.Principal goods mirror 1, compensating glass 3, the first fixed lens 4 and second fixed lens 5 these four lens are spherical lens; The saturating border of diffraction surfaces that zoom mirror 2 is aspheric substrate, for correcting chromatic aberration.The first described catoptron 6 is installed with optical axis angle at 45 ° in light path, for light path being turned back to 90 °; The second catoptron 7 is installed at an angle of 90 with respect to the first catoptron 6 in light path, and for again light path being turned back 90 °, light path is turned back 180 ° the most at last, realizes light path folding, compression volume, reduces the effect of weight.The focal power of described first rear group of lens 8, second rear group of lens 9 and three rear group of lens 10 is Negative-Positive-Negative structure.First rear group of lens 8, second rear group of lens 9 and three rear group of lens 10 materials are respectively silicon, germanium, silicon.First rear group of lens 8, three rear group of lens 10 these two lens are spherical lens; Second rear group of lens 9 is non-spherical lens, for improving image quality.
The aperture diaphragm that the present invention has a continuous vari-focus medium-wave infrared optical system of overlength focal length is arranged on the cold stop position of detector 11, to meet 100% cold stop efficiency requirement, the parasitic light of avoiding the hot backgrounds such as lens barrel to produce enters detector 11, improve the signal to noise ratio (S/N ratio) of output image, and be provided with the focal plane of detector 11 at the image planes place of optical system of the present invention.Varifocal mirror in the present invention and the motion of the zoom of compensating glass can realize by the many bar guiding of a kind of framework integrated type continuous vari-focus device; This device comprises the framework with two chambers, described framework is entirety, and its middle part wall one side cavity is Zoom lens chamber, and the Zoom lens group that comprises 1 Zoom lens is installed, another surveys chamber is offset lens chamber, and the offset lens group that comprises 1 offset lens is installed.
The present invention have overlength focal length continuous vari-focus medium-wave infrared optical system remarkable result as shown in drawings, in accompanying drawing: Fig. 4 is that the short imaging when burnt of the present invention passes letter figure; Imaging when Fig. 5 is burnt in the present invention passes letter figure; Imaging when Fig. 6 is long Jiao of the present invention passes letter figure.
Claim protection domain of the present invention is not limited to above-described embodiment.
Claims (10)
1. a continuous vari-focus medium-wave infrared optical system with overlength focal length, is characterized in that, order comprises from the object side to the image side: group (C) after varifocus objective group (A), catoptron group (B) and secondary imaging; Described varifocus objective group (A) comprises principal goods mirror (1), zoom mirror (2), compensating glass (3), the first fixed lens (4) and the second fixed lens (5); Catoptron group (B) comprises the first catoptron (6) and the second catoptron (7); Group after secondary imaging (C) comprises first rear group of lens (8), second rear group of lens (9) and three rear group of lens (10); Described zoom mirror (2) and compensating glass (3) move on same optical axis, for continuous vari-focus; The light from object space is pooled picture by varifocus objective group (A), and imaging surface is between the first catoptron (6) and the second catoptron (7); Varifocus objective group (A) imaging re-imaging is arrived final image planes by first rear group of lens (8), second rear group of lens (9) and three rear group of lens (10).
2. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 1, is characterized in that, this system aperture F is 4.0, and wave band is 3～5 μ m, and focal range is 88～1100mm.
3. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 1, it is characterized in that, principal goods mirror (1), zoom mirror (2), compensating glass (3), the first fixed lens (4), the second fixed lens (5), first rear group of lens (8), second rear group of lens (9) and three rear group of lens (10) are respectively 1, have 8 lens; The first catoptron (6) and the second catoptron (7) are respectively 1, totally 2 catoptrons.
4. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 1, it is characterized in that, the focal power of principal goods mirror (1), zoom mirror (2), compensating glass (3), the first fixed lens (4), the second fixed lens (5) is assigned as Negative-Positive-Negative-negative-positive structure.
5. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 4, it is characterized in that, the lens material of principal goods mirror (1), zoom mirror (2), compensating glass (3), the first fixed lens (4) and the second fixed lens (5) is respectively silicon, germanium, silicon, zinc selenide, silicon.
6. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 5, is characterized in that, these four lens of principal goods mirror (1), compensating glass (3), the first fixed lens (4) and the second fixed lens (5) are spherical lens; The saturating border of diffraction surfaces that zoom mirror (2) is aspheric substrate.
7. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 1, is characterized in that, the first catoptron (6) is installed with optical axis angle at 45 ° in light path, for light path being turned back to 90 °; The second catoptron (7) is installed at an angle of 90 with respect to the first catoptron (6) in light path, and for again light path being turned back 90 °, light path is turned back 180 ° the most at last.
8. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 1, is characterized in that, the focal power of first rear group of lens (8), second rear group of lens (9) and three rear group of lens (10) is Negative-Positive-Negative structure.
9. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 8, is characterized in that, first rear group of lens (8), second rear group of lens (9) and three rear group of lens (10) material are respectively silicon, germanium, silicon.
10. the continuous vari-focus medium-wave infrared optical system with overlength focal length according to claim 9, is characterized in that, first rear group of lens (8), these two lens of three rear group of lens (10) are spherical lens; Second rear group of lens (9) are non-spherical lens.
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Cited By (12)
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| CN104932094A (en) * | 2015-06-02 | 2015-09-23 | 湖北久之洋红外系统股份有限公司 | Medium wave infrared imaging lens for array panoramic scanning |
| CN105974566A (en) * | 2016-07-19 | 2016-09-28 | 山东神戎电子股份有限公司 | Large-zoom-ratio turn-back type medium-wave infrared continuous zoom lens |
| CN108008529A (en) * | 2017-11-24 | 2018-05-08 | 湖北久之洋红外系统股份有限公司 | A kind of two grades of infrared optical systems of convertible medium wave |
| CN108366185A (en) * | 2018-02-09 | 2018-08-03 | 中国科学院长春光学精密机械与物理研究所 | A kind of variable focal length infrared imaging terminal |
| CN108431660A (en) * | 2015-12-23 | 2018-08-21 | 泰勒斯公司 | The full light zoom of range optimization |
| CN108761748A (en) * | 2018-08-10 | 2018-11-06 | 济南和普威视光电技术有限公司 | A kind of medium wave refrigeration infrared continuous zoom lens |
| CN110119022A (en) * | 2019-05-17 | 2019-08-13 | 中国科学院上海技术物理研究所 | A kind of infrared two grades of zooms planar array scanning optical system |
| CN110703422A (en) * | 2019-11-15 | 2020-01-17 | 湖北久之洋红外系统股份有限公司 | Ultra-large zoom ratio 50X continuous zooming medium wave infrared optical system |
| CN111025529A (en) * | 2019-12-04 | 2020-04-17 | 湖北久之洋红外系统股份有限公司 | Ultra-small F number medium-long wave infrared fixed-focus lens |
| CN112305734A (en) * | 2020-11-18 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | Large-target-surface medium-wave refrigeration infrared continuous zooming optical system with two-dimensional swing mirror |
| CN112363305A (en) * | 2020-11-23 | 2021-02-12 | 湖北久之洋红外系统股份有限公司 | Microminiature medium wave infrared continuous zooming optical system |
| CN114184284A (en) * | 2021-12-01 | 2022-03-15 | 湖北久之洋信息科技有限公司 | Real-time scene correction method and system for longitudinal scanning thermal infrared imager |
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| CN104932094A (en) * | 2015-06-02 | 2015-09-23 | 湖北久之洋红外系统股份有限公司 | Medium wave infrared imaging lens for array panoramic scanning |
| CN108431660A (en) * | 2015-12-23 | 2018-08-21 | 泰勒斯公司 | The full light zoom of range optimization |
| CN108431660B (en) * | 2015-12-23 | 2020-11-27 | 泰勒斯公司 | Range optimized plenoptic zoom |
| CN105974566A (en) * | 2016-07-19 | 2016-09-28 | 山东神戎电子股份有限公司 | Large-zoom-ratio turn-back type medium-wave infrared continuous zoom lens |
| CN108008529B (en) * | 2017-11-24 | 2020-06-09 | 湖北久之洋红外系统股份有限公司 | Turnover type medium-wave two-gear infrared optical system |
| CN108008529A (en) * | 2017-11-24 | 2018-05-08 | 湖北久之洋红外系统股份有限公司 | A kind of two grades of infrared optical systems of convertible medium wave |
| CN108366185A (en) * | 2018-02-09 | 2018-08-03 | 中国科学院长春光学精密机械与物理研究所 | A kind of variable focal length infrared imaging terminal |
| CN108366185B (en) * | 2018-02-09 | 2021-02-12 | 中国科学院长春光学精密机械与物理研究所 | Variable-focal-length infrared imaging terminal |
| CN108761748A (en) * | 2018-08-10 | 2018-11-06 | 济南和普威视光电技术有限公司 | A kind of medium wave refrigeration infrared continuous zoom lens |
| CN110119022A (en) * | 2019-05-17 | 2019-08-13 | 中国科学院上海技术物理研究所 | A kind of infrared two grades of zooms planar array scanning optical system |
| CN110119022B (en) * | 2019-05-17 | 2023-07-04 | 中国科学院上海技术物理研究所 | Infrared two-gear zooming area array scanning optical system |
| CN110703422A (en) * | 2019-11-15 | 2020-01-17 | 湖北久之洋红外系统股份有限公司 | Ultra-large zoom ratio 50X continuous zooming medium wave infrared optical system |
| CN111025529A (en) * | 2019-12-04 | 2020-04-17 | 湖北久之洋红外系统股份有限公司 | Ultra-small F number medium-long wave infrared fixed-focus lens |
| CN111025529B (en) * | 2019-12-04 | 2021-12-17 | 湖北久之洋红外系统股份有限公司 | Ultra-small F number medium-long wave infrared fixed-focus lens |
| CN112305734A (en) * | 2020-11-18 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | Large-target-surface medium-wave refrigeration infrared continuous zooming optical system with two-dimensional swing mirror |
| CN112305734B (en) * | 2020-11-18 | 2024-01-26 | 湖北久之洋红外系统股份有限公司 | Large target surface medium wave refrigerating infrared continuous zooming optical system with two-dimensional oscillating mirror |
| CN112363305A (en) * | 2020-11-23 | 2021-02-12 | 湖北久之洋红外系统股份有限公司 | Microminiature medium wave infrared continuous zooming optical system |
| CN112363305B (en) * | 2020-11-23 | 2024-03-15 | 湖北久之洋红外系统股份有限公司 | Microminiature medium wave infrared continuous zooming optical system |
| CN114184284A (en) * | 2021-12-01 | 2022-03-15 | 湖北久之洋信息科技有限公司 | Real-time scene correction method and system for longitudinal scanning thermal infrared imager |
| CN114184284B (en) * | 2021-12-01 | 2023-07-07 | 湖北久之洋信息科技有限公司 | Real-time scene correction method and system for longitudinal scanning thermal infrared imager |
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