CN103345046B - Two-gear zoom optical system - Google Patents
Two-gear zoom optical system Download PDFInfo
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- CN103345046B CN103345046B CN201310269830.XA CN201310269830A CN103345046B CN 103345046 B CN103345046 B CN 103345046B CN 201310269830 A CN201310269830 A CN 201310269830A CN 103345046 B CN103345046 B CN 103345046B
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- light path
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Abstract
The invention provides a two-gear zoom optical system which mainly solves the problem that an existing system is complex in structure. On the basis that the number of optical parts is not increased, the two-gear zoom optical system achieves two-gear focal length changes through the optical system objective image exchange principle and rotation of assemblies, the system image surface is stable, and the two-gear zoom optical system can be used in the serious ground environments and the serious aeronautical environments. The two-gear zoom optical system comprises a front set of optical paths and a dual telecentric optical path, wherein the dual telecentric optical path is formed by a first lens set and a second lens set. When outgoing light of the front set of optical paths sequentially passes through the first lens set and the second lens set, the amplifying ratio is a. When the outgoing light of the front set of optical paths sequentially passes through the second lens set and the first lens set, the amplifying ratio is 1/a.
Description
Technical field
The present invention relates to a kind of Switch-zoom optical system, belong to optical lens design field.
Background technology
Variable focal length optical system refers to that focal length is variable and image planes position keeps stable optical system, continuous vari-focus system is in zooming procedure, for ensureing image planes position stability, the displacement of compensation image planes of must taking measures, cause the structure of continuous vari-focus system very complicated like this, thus, under some special applications, the normal double-view field two grades of zoom system, pancreatic systems that use replace continuous vari-focus system.
Compared with continuous vari-focus system, Switch-zoom system can save complicated Design of cam curves, by simple mechanical compensation mode, realize long and short two kinds of different focal lengths, the visual field that corresponding narrow/wide two kinds is different with it, according to different use occasions, selects corresponding visual field or focal length.And two grades of zoom system, pancreatic systems are compared with traditional zoom system, pancreatic system, have the advantages such as the optical axis rocks little, and zooming time is short.
Traditional Switch-zoom system has suitching type Switch-zoom system, is realized Switch-zoom system by moving axially of one group of optical element and rotated incision Switch-zoom mode.
Move axially zooming system needs zoom group and compensating group to move axially usually simultaneously, and complicated structure, not easily realizes quick zoom.Suitching type two grades of systems and rotation cut-in type Switch-zoom system, with often needing zoom group, add the quantity of optical element and the complicacy of structure.
Summary of the invention
The invention provides a kind of Switch-zoom optical system, mainly solve the baroque problem of existing system; This Switch-zoom optical system on the basis not increasing optical element quantity, utilize optical system image exchange principle and assembly self to rotate to realize two grades of focal length variations, system image planes are stablized, and can apply in comparatively severe ground and aeronautical environment.
Concrete technical solution of the present invention is as follows:
Group light path and two telecentric beam path before this Switch-zoom optical system comprises, described pair of telecentric beam path is made up of the first mirror group and the second mirror group, if the emergent light of premenstrual group of light path is successively by the first mirror group and the second mirror group, its enlargement ratio is a, if the emergent light of premenstrual group of light path is successively by the second mirror group and the first mirror group, its enlargement ratio is 1/a.
Above-mentioned first mirror group is Polaroid telephotolens, is made up of, has telecentric structure 3 simple lenses and a gummed mirror group.
Above-mentioned second mirror group is zooming transform mirror group, and the picture of the first mirror group is imaged in final image planes, sets gradually and is made up of 7 simple lenses and one group of two cemented doublet, have object space image space double telecentric structure along light path.
Before above-mentioned, the exit pupil position of group light path and the entrance pupil position of two telecentric beam path overlap.
The object space relative aperture of above-mentioned pair of telecentric beam path should be more than or equal to the image space relative aperture of front group light path.
The image space of above-mentioned pair of telecentric beam path should be more than or equal to the image space of front group light path.
The invention has the advantages that:
Switch-zoom optical system provided by the invention adopts image to exchange principle and designs, zoom mode is simple, do not exist and cut into cutting out or screw-in zoom assembly, design easy, can be applicable among visible ray and infrared optical system, later stage structural design also can obtain corresponding simplification, from the angle of optical manufacturing and machining, saves energy consumption and starting material, operation; Reliability is higher, can be applied in the mechanical environments such as Aero-Space comparatively under rugged environment.
Accompanying drawing explanation
Fig. 1 organizes the structural representation of light path before being;
Fig. 2 is the structural representation of the first mirror group;
Fig. 3 is the structural representation of the second mirror group;
Fig. 4 is the structural representation after the first mirror group and the second mirror group combine;
Fig. 5 is the structural representation after the second mirror group and the first mirror group combine;
Fig. 6 is the structural representation of group light path and the combination of Fig. 4 light path before Fig. 1;
Fig. 7 is the structural representation of group light path and the combination of Fig. 5 light path before Fig. 1.
Embodiment
The principle of institute of the present invention foundation is as follows:
Total focal length of optical system is:
f=f
1·β
1·β
2·β
3…=f
1·β （1）
Wherein f
1for front group of optical system focal length, β
1, β
2, β
3for the enlargement ratio of follow-up each group, exchange principle, for any optical module according to optical system image, there are two conjugate positions, on the conjugate position of optical module, the conjugate distance of system is constant, its enlargement ratio is reciprocal each other, and namely when assembly is in A position, its enlargement ratio is β
a, when assembly is in the conjugate position of A position, its enlargement ratio is 1/ β
a, from formula (1), now system focal length is:
The zoom ratio of system is:
Namely system can realize rear group of enlargement ratio square zoom relation doubly.The method does not need the incision in traditional Switch-zoom system to cut out mirror group or screw-in mirror group, the mode of single mirror group is adopted to realize two grades of focal lengths variable, by choosing of rear group system enlargement ratio, any Switch-zoom optical system can be realized in theory, rear group of multiplying power is larger, and Optical System Design difficulty is larger.
Optical system splicing key problems:
The exit pupil position of front group system should overlap with the entrance pupil position of rear group system, otherwise can cause light energy losses; The object space relative aperture of rear group system should be more than or equal to the image space relative aperture of front group system, otherwise can cause energy loss equally; The image space of rear group system should be more than or equal to the image space of front group system, otherwise can visual field be caused to cut; When meeting above-mentioned requirements, if rear group system can accomplish that object space and the two telecentric system splicing effect of image space can be better.
Give the example of the system of this kind of method design below, group optical system before Fig. 1 gives, its focal length is 100mm, Fig. 2 gives second group of optical system, and its focal length is that 40mm, Fig. 3 give the 3rd group of optical system, its focal length is 80mm, second group system and the 3rd group system are combined, form a two telecentric beam path as shown in Figure 4, this system magnification is 2 times.By combination after system its enlargement ratio after its central rotation 180 ° be 1/2 times, its system diagram is as shown in Figure 5.
Two telecentric optical system after combination and front group are combined again, overlap joint becomes final system, when rear group of enlargement ratio is 2 times, as shown in Figure 6, now the total focal length of system is 200mm to its system diagram, revolves turnback by rear group, during its conjugate position of transposition, rear group of enlargement ratio is 1/2 times, and now the total focal length of combined system is 50mm, achieves 50mm and 200mm two grades of zooms.This mode does not increase the optical element of system, there is not switching device shifter, and novel structure, reliability is high.
Claims (4)
1. a Switch-zoom optical system, group light path before comprising, it is characterized in that: also comprise two telecentric beam path, described pair of telecentric beam path is made up of the first mirror group and the second mirror group, if the emergent light of premenstrual group of light path is successively by the first mirror group and the second mirror group, its enlargement ratio is a, if the emergent light of premenstrual group of light path is successively by the second mirror group and the first mirror group, its enlargement ratio is 1/a; Described first mirror group is Polaroid telephotolens, is made up of, has telecentric structure 3 simple lenses and a gummed mirror group; Described second mirror group is zooming transform mirror group, and the picture of the first mirror group is imaged in final image planes, sets gradually and is made up of 7 simple lenses and one group of two cemented doublet, have object space image space double telecentric structure along light path.
2. Switch-zoom optical system according to claim 1, is characterized in that: before described, the exit pupil position of group light path and the entrance pupil position of two telecentric beam path overlap.
3. Switch-zoom optical system according to claim 1, is characterized in that: the object space relative aperture of described pair of telecentric beam path should be more than or equal to the image space relative aperture of front group light path.
4. Switch-zoom optical system according to claim 1, is characterized in that: the image space of described pair of telecentric beam path should be more than or equal to the image space of front group light path.
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| CN201310269830.XA CN103345046B (en) | 2013-06-28 | 2013-06-28 | Two-gear zoom optical system |
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| CN201310269830.XA CN103345046B (en) | 2013-06-28 | 2013-06-28 | Two-gear zoom optical system |
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| CN103345046B true CN103345046B (en) | 2015-05-20 |
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| CN109186760A (en) * | 2018-08-22 | 2019-01-11 | 中国北方车辆研究所 | A kind of medium-wave infrared EO-1 hyperion optical imaging system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708532A (en) * | 1995-06-03 | 1998-01-13 | Jos. Schneider Optische Werke Kreuznach Gmbh & Co. Kg | Double-sided telecentric measurement objective |
| US6867922B1 (en) * | 1999-06-14 | 2005-03-15 | Canon Kabushiki Kaisha | Projection optical system and projection exposure apparatus using the same |
| CN101000409A (en) * | 2006-12-30 | 2007-07-18 | 上海微电子装备有限公司 | Variable multi-power projection optical system |
| CN100456074C (en) * | 2007-03-27 | 2009-01-28 | 上海微电子装备有限公司 | Symmetrical double-telecentric projection optical system |
| CN102645749A (en) * | 2012-04-21 | 2012-08-22 | 张家港鹏博光电科技有限公司 | Magnification regulating method of projection optical system |
| CN203365787U (en) * | 2013-06-28 | 2013-12-25 | 中国科学院西安光学精密机械研究所 | Two-gear zoom optical system |
-
2013
- 2013-06-28 CN CN201310269830.XA patent/CN103345046B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708532A (en) * | 1995-06-03 | 1998-01-13 | Jos. Schneider Optische Werke Kreuznach Gmbh & Co. Kg | Double-sided telecentric measurement objective |
| US6867922B1 (en) * | 1999-06-14 | 2005-03-15 | Canon Kabushiki Kaisha | Projection optical system and projection exposure apparatus using the same |
| CN101000409A (en) * | 2006-12-30 | 2007-07-18 | 上海微电子装备有限公司 | Variable multi-power projection optical system |
| CN100456074C (en) * | 2007-03-27 | 2009-01-28 | 上海微电子装备有限公司 | Symmetrical double-telecentric projection optical system |
| CN102645749A (en) * | 2012-04-21 | 2012-08-22 | 张家港鹏博光电科技有限公司 | Magnification regulating method of projection optical system |
| CN203365787U (en) * | 2013-06-28 | 2013-12-25 | 中国科学院西安光学精密机械研究所 | Two-gear zoom optical system |
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Effective date of registration: 20220112 Address after: 710119 room 104, 1 / F, block D, Youxin electronic Park, 1701 Shanglinyuan 4th Road, high tech Zone, Xi'an, Shaanxi Province Patentee after: XI'AN WEIPU PHOTOELECTRIC TECHNOLOGY CO.,LTD. Address before: 710119, No. 17, information Avenue, new industrial park, hi tech Zone, Shaanxi, Xi'an Patentee before: XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICS, CHINESE ACADEMY OF SCIENCES |