CN203365787U - Two-gear zoom optical system - Google Patents
Two-gear zoom optical system Download PDFInfo
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- CN203365787U CN203365787U CN 201320383974 CN201320383974U CN203365787U CN 203365787 U CN203365787 U CN 203365787U CN 201320383974 CN201320383974 CN 201320383974 CN 201320383974 U CN201320383974 U CN 201320383974U CN 203365787 U CN203365787 U CN 203365787U
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Abstract
The utility model provides a two-gear zoom optical system, which mainly solves the problem of complex structure of the existing system; the two-gear zoom optical system realizes two-gear focal length change by utilizing the object image exchange principle of the optical system and the rotation of the component on the basis of not increasing the number of optical parts, has stable system image surface, and can be applied to severe ground and aviation environment. The two-gear zoom optical system comprises a front group optical path and a double telecentric optical path, wherein the double telecentric optical path is composed of a first lens group and a second lens group, if emergent light passing through the front group optical path sequentially passes through the first lens group and the second lens group, the magnification ratio is a, and if the emergent light passing through the front group optical path sequentially passes through the second lens group and the first lens group, the magnification ratio is 1/a.
Description
Technical field
The present invention relates to a kind of Switch-zoom optical system, belong to the optical lens design field.
Background technology
Variable focal length optical system refers to that focal length is variable and the image planes position keeps stable optical system, the continuous vari-focus system is in the zoom process, for guaranteeing the image planes position stability, must take measures to compensate the displacement of image planes, cause like this structure of continuous vari-focus system very complicated, thereby, under some special applications, often use two grades of zoom system, pancreatic systems of double-view field to replace the continuous vari-focus system.
With the continuous vari-focus system, compare, the Switch-zoom system can be saved complicated Design of cam curves, by simple mechanical compensation mode, realize long and short two kinds of different focal lengths, two kinds of different visual fields of corresponding narrow/wide, according to different use occasions, select corresponding visual field or focal length with it.And two grades of zoom system, pancreatic systems are compared with traditional zoom system, pancreatic system, have the optical axis rock little, the advantage such as zooming time is short.
Traditional Switch-zoom system has suitching type Switch-zoom system, by moving axially of one group of optical element, realizes Switch-zoom system and rotation incision Switch-zoom mode.
Move axially zooming system needs zoom group and compensation group to move axially usually simultaneously, and complicated structure, be difficult for realizing quick zoom.Two grades of systems of suitching type and rotation cut-in type Switch-zoom system, with often needing the zoom group, have increased 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 solved the baroque problem of existing system; This Switch-zoom optical system on the basis that does not increase optical element quantity, utilize the rotation of optical system image exchange principle and assembly self to realize two grades of focal length variations, the system image planes are stable, can in comparatively severe ground and aeronautical environment, apply.
Concrete technical solution of the present invention is as follows:
This Switch-zoom optical system comprises front group of light path and two telecentric beam path, described pair of telecentric beam path consists of first mirror group and the second mirror group, if the emergent light of premenstrual group of light path is successively by 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 first mirror group, its enlargement ratio is 1/a.
Above-mentioned first mirror group is Polaroid telephotolens, 3 simple lenses and a gummed mirror group, consists of, and has telecentric structure.
Above-mentioned the second mirror group is zooming transform mirror group, and the picture of first mirror group is imaged in to final image planes, along light path, sets gradually by 7 simple lenses and one group of two gummed eyeglass and forms, and has object space image space double telecentric structure.
The entrance pupil position of the exit pupil position of above-mentioned front group of light path and two telecentric beam paths overlaps.
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 of 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 of light path.
The invention has the advantages that:
Switch-zoom optical system provided by the invention adopts image exchange principle to be designed, the 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, the later stage structural design also can obtain corresponding simplification, from the angle of optics processing and machining, has saved energy consumption and starting material, operation; Reliability is higher, can be applied in the mechanical environments such as Aero-Space comparatively under rugged environment.
The accompanying drawing explanation
The structural representation that Fig. 1 is front group of light path;
The structural representation that Fig. 2 is the first mirror group;
The structural representation that Fig. 3 is the second mirror group;
Fig. 4 is the structural representation after first mirror group and the combination of the second mirror group;
Fig. 5 is the structural representation after the second mirror group and the combination of first mirror group;
Fig. 6 is the structural representation of organizing light path and the combination of Fig. 4 light path before Fig. 1;
Fig. 7 is the structural representation of organizing 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）
F wherein
1for front group of optical system focal length, β
1, β
2, β
3for the enlargement ratio of follow-up each group, according to optical system image exchange principle, for any optical module, have 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 when assembly during in the A position, its enlargement ratio is β
a, during conjugate position when assembly in the A position, its enlargement ratio is 1/ β
a, from formula (1), now the system focal length is:
The zoom ratio of system is:
Be that 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, adopt the mode of single mirror group to realize that two grades of focal lengths are variable, by choosing of rear group system enlargement ratio, can realize in theory any Switch-zoom optical system, rear group of multiplying power is larger, and the 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 cause the visual field cutting; In the situation that meet 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.
Provided below the example of this kind of method designed system, Fig. 1 has provided front group of optical system, its focal length is 100mm, Fig. 2 has provided second group of optical system, and its focal length is 40mm, and Fig. 3 has provided the 3rd group of optical system, its focal length is 80mm, the second group system and the 3rd group system are combined, form two telecentric beam paths as shown in Figure 4, this system enlargement ratio is 2 times.By its enlargement ratio after the system Rao Qi center Rotate 180 ° after combination, be 1/2 times, its system diagram as shown in Figure 5.
By the combination after two telecentric optical systems and front group again combine, 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, by rear group of Rotate 180 degree, 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, realized two grades of zooms of 50mm and 200mm.This mode does not increase the optical element of system, does not have switching device shifter, and novel structure, and reliability is high.
Claims (6)
1. a Switch-zoom optical system, comprise front group of light path, it is characterized in that: also comprise two telecentric beam paths, described pair of telecentric beam path consists of first mirror group and the second mirror group, if the emergent light of premenstrual group of light path is successively by first mirror group and the second mirror group, its enlargement ratio is a, if the emergent light of premenstrual group of light path passes through the second mirror group and first mirror group successively, its enlargement ratio is 1/a.
2. Switch-zoom optical system according to claim 1, it is characterized in that: described first mirror group is Polaroid telephotolens, 3 simple lenses and a gummed mirror group, consists of, and has telecentric structure.
3. Switch-zoom optical system according to claim 1, it is characterized in that: described the second mirror group is zooming transform mirror group, the picture of first mirror group is imaged in to final image planes, along light path, set gradually by 7 simple lenses and one group of two gummed eyeglass and form, there is object space image space double telecentric structure.
4. Switch-zoom optical system according to claim 1, is characterized in that: the entrance pupil position coincidence of the exit pupil position of described front group of light path and two telecentric beam paths.
5. Switch-zoom optical system according to claim 1, it 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 of light path.
6. Switch-zoom optical system according to claim 1, it 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 of light path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320383974 CN203365787U (en) | 2013-06-28 | 2013-06-28 | Two-gear zoom optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320383974 CN203365787U (en) | 2013-06-28 | 2013-06-28 | Two-gear zoom optical system |
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| CN203365787U true CN203365787U (en) | 2013-12-25 |
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| CN 201320383974 Expired - Lifetime CN203365787U (en) | 2013-06-28 | 2013-06-28 | Two-gear zoom optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103345046A (en) * | 2013-06-28 | 2013-10-09 | 中国科学院西安光学精密机械研究所 | Two-gear zoom optical system |
| CN104360463A (en) * | 2014-12-05 | 2015-02-18 | 桂林电子科技大学 | Three-distal coaxial illumination imaging optical system |
-
2013
- 2013-06-28 CN CN 201320383974 patent/CN203365787U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103345046A (en) * | 2013-06-28 | 2013-10-09 | 中国科学院西安光学精密机械研究所 | Two-gear zoom optical system |
| CN103345046B (en) * | 2013-06-28 | 2015-05-20 | 中国科学院西安光学精密机械研究所 | Two-gear zoom optical system |
| CN104360463A (en) * | 2014-12-05 | 2015-02-18 | 桂林电子科技大学 | Three-distal coaxial illumination imaging optical system |
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Granted publication date: 20131225 |