CN2296018Y - Imaging structure of long focus optical system - Google Patents
Imaging structure of long focus optical system Download PDFInfo
- Publication number
- CN2296018Y CN2296018Y CN 97239617 CN97239617U CN2296018Y CN 2296018 Y CN2296018 Y CN 2296018Y CN 97239617 CN97239617 CN 97239617 CN 97239617 U CN97239617 U CN 97239617U CN 2296018 Y CN2296018 Y CN 2296018Y
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- lens
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- plane mirror
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Abstract
The utility model relates to a long focus optical system, belonging to an applied optics design. The utility model has a structure of a coude type double mirror which is made by the arrangement of two blocks of concave reflecting mirrors are intercrossed perpendicularly to each other along a crossing point of two center perpendicular lines of each concave surface of the concave reflecting mirrors. The arrangement of the reflecting mirrors with a slope enables a light path to reflect. A field lens is arranged on the vicinity of a combination focal plane of the two blocks of concave reflecting mirrors; a lens assembly is arranged below the field lens to form images. The utility model has the advantages of small center barrier, high optical-modulation transfer function, simple structure, convenient loading and regulating, clear image forming, which is suitable for image forming of objects in light with an infinite distance.
Description
The utility model belongs to the improvement of long-focus imaging arrangement in the Applied Optics Design field.
In general, selecting long-focus mainly is for obtaining the sharp image of distant object, and bigger zone can be detected in big visual field.For the optical system structure of long-focus high-resolution imaging, what adopt mostly at present is the refractive and reflective optical system of matching Green or Marko Shu Tuofu type system as card, or three-mirror system and refraction type system.Adopt catadioptric optical system, except that the center hide the hurdle can not be little, also, then must add eliminate stray light light hurdle in the system owing to there is parasitic light can directly arrive image planes, cause the optical-modulation transfer function decline of the outer visual field of axle.If adopt non-ly from axle three mirror structures, can not produce aberration, axle is outer does not block light, but the visual field can not be big, otherwise the central obscuration of system to increase, also cause the decline of optical-modulation transfer function.For non co axial three mirror structures, though can make total system not have central obscuration, and the visual field optical-modulation transfer function is also than higher entirely, it is higher that it debugs position accuracy demand, and assembly technology is difficult to realize.The refraction type system then exists achromatism and second order spectrum problem, for achromatism, must select special optical glass material for use.
The purpose of this utility model is the problem at above-mentioned existence, design a kind of simple in structure, assembling easily, central obscuration is little, and can make the optical-modulation transfer function imaging arrangement that increase, that be applicable to the long-focal distance optical system of distant object observation of system.
For achieving the above object, the imaging structure with long-focal length optical system that the utility model is designed, use two concave mirrors are arranged, plane mirror, field lens and a lens combination and corrective lens (eye protection); It is characterized in that, adopt refraction type double mirror optical imagery structure, be that two concave mirrors are intersected vertical setting mutually along the center vertical line of its concave surface, in its point of crossing inclined position plane mirror being set makes light path turn back along axle, wherein the position of first concave mirror opposite planar catoptron is that plane mirror is near its focus, the position of the second concave mirror opposite planar catoptron two times of focal lengths that are plane mirror beyond its focus are with interior position, field lens is positioned near the combined focal of two concave mirrors, and light path is again through the lens combination imaging.And corrective lens (eye protection) can be arranged between plane mirror and the field lens, also can be arranged on the below of lens combination.
For optical system, having only the curvature of field is to be decided by each power of lens in the optical system, and irrelevant with the bending and the interval variation of lens, therefore mixes in structure model selection and each focal power branch, and must make the elementary curvature of field is zero.Because in the structure of utility model, two concave mirrors can produce the negative curvature of field, and field lens and lens combination all produce the positive curvature of field, so can guarantee that the elementary curvature of field of total system is very little; In addition, the optical-modulation transfer function of perfect optical system is relevant with central obscuration under the certain situation of relative aperture, and in design of the present utility model, the size of plane mirror has determined blocking of system, can be by selecting for use little radius-of-curvature to come the size of control plane catoptron to first concave mirror, thus the central obscuration of system is reduced; And choosing of second concave reflection curvature radius should guarantee that plane mirror does not stop the imaging beam through its reflection; On the basis that central obscuration is little and optical-modulation transfer function system increases of assurance whole optical system, make the utility model can realize the imaging of target in the light of infinite distance in theory; With the catadioptric formula of long-focus or non-, the utlity model has the advantage that central obscuration is little, stray light is little, the optical modulation function is high from the comparison of axle three-mirror reflective optical system; With from axle three mirror structures relatively, the present invention has and debugs easy advantage; Compare with the long-focus refractive optical system, can be without special material.So the utlity model has simple in structure, reasonable in design, debug easily, imaging advantage clearly.
Below in conjunction with accompanying drawing enforcement of the present utility model is further described below.
Accompanying drawing 1 is the structural representation and the optical schematic diagram of a kind of example of the designed imaging structure with long-focal length optical system of the utility model, and accompanying drawing 2 is the structural representation and the optical schematic diagram of the another kind of example of the utility model.1 is first concave mirror among the figure, and 2 is second concave mirror, and 3 is plane mirror, and 4 is field lens, and 5 is lens combination, and 6 is corrective lens (eye protection).
Referring to accompanying drawing, the designed imaging structure with long-focal length optical system of the utility model adopts folding shaft type double mirror optical imagery structure, be that two concave mirrors 1 and the 2 center vertical lines along its concave surface are intersected vertical setting mutually, in the point of crossing inclined position plane mirror 3 be set light path is turned back along axle; Wherein the position of concave mirror 1 opposite planar catoptron 3 is that plane mirror 3 is near the focus of catoptron 1, the position of the concave mirror 2 opposite planar catoptrons 3 two times of focal lengths that are plane mirror 3 beyond the focus of catoptron 2 are with interior position, field lens 4 is positioned near the combined focal of two concave mirrors 1 and 2, and light path images in image planes through lens combination 5 again; And corrective lens (eye protection) 6 can be arranged between plane mirror 3 and the field lens 4 (as Fig. 1), also can be arranged on (as Fig. 2) between lens combination 5 and the image planes.
Optical principle of the present utility model is, target enters first concave mirror 1 in the remote light, be imaged on its focal position after the reflection, near its focus plane mirror 3 reflexes to second concave mirror 2, light reflects once more through field lens 4 and lens combination 5, last imaging on the image planes of total system, thus reach the purpose of long-focus imaging, and the purpose that adds corrective lens (eye protection) 6 is to go up and off-axis aberration in order to proofread and correct good axle.
The imaging structure with long-focal length optical system that the utility model is designed, should be in specifically manufacturing according to parameters such as the system's focal length in the proposition technical indicator, visual field, relative apertures, take in and calculate, determine the parameter of each optics, and will consider the layout and the difficulty of processing of total system structure.
Claims (2)
1. imaging structure with long-focal length optical system, use has two concave mirrors, a plane mirror, field lens and lens combination and corrective lens (eye protection), it is characterized in that, adopt folding shaft type double mirror optical imagery structure, be that two concave mirrors are intersected vertical setting mutually along the center vertical line of its concave surface, in its point of crossing inclined position plane mirror being set makes light path turn back along axle, wherein the position of first concave mirror opposite planar catoptron is that plane mirror is near its focus, the position of the second concave mirror opposite planar catoptron two times of focal lengths that are plane mirror beyond its focus are with interior position, field lens is positioned near the combined focal of two concave mirrors, and light path arrives image planes through lens combination again.
2. imaging arrangement according to claim 1 is characterized in that described corrective lens (eye protection) is arranged between plane mirror and the field lens, or between lens combination and image planes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97239617 CN2296018Y (en) | 1997-05-12 | 1997-05-12 | Imaging structure of long focus optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97239617 CN2296018Y (en) | 1997-05-12 | 1997-05-12 | Imaging structure of long focus optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2296018Y true CN2296018Y (en) | 1998-10-28 |
Family
ID=33949562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97239617 Expired - Lifetime CN2296018Y (en) | 1997-05-12 | 1997-05-12 | Imaging structure of long focus optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2296018Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750754B (en) * | 2008-12-17 | 2011-05-25 | 中国科学院西安光学精密机械研究所 | Field cut-off optical synthesis aperture imaging system |
| CN106371200A (en) * | 2016-11-09 | 2017-02-01 | 苏州大学 | Broad wave band, large view field and large aperture coude three reflection afocal optical system |
-
1997
- 1997-05-12 CN CN 97239617 patent/CN2296018Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101750754B (en) * | 2008-12-17 | 2011-05-25 | 中国科学院西安光学精密机械研究所 | Field cut-off optical synthesis aperture imaging system |
| CN106371200A (en) * | 2016-11-09 | 2017-02-01 | 苏州大学 | Broad wave band, large view field and large aperture coude three reflection afocal optical system |
| CN106371200B (en) * | 2016-11-09 | 2018-08-24 | 苏州大学 | The big visual field heavy caliber of broadband rolls over three anti-non-focus optical system of axis |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |