CN103309125A - Cassegrain optical system shading assembly - Google Patents
Cassegrain optical system shading assembly Download PDFInfo
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- CN103309125A CN103309125A CN2013102703007A CN201310270300A CN103309125A CN 103309125 A CN103309125 A CN 103309125A CN 2013102703007 A CN2013102703007 A CN 2013102703007A CN 201310270300 A CN201310270300 A CN 201310270300A CN 103309125 A CN103309125 A CN 103309125A
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- cylindrical sleeves
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Abstract
A Cassegrain optical system shading assembly belongs to the field of lens hood designing and solves the problem that the existing lens hoods can not restrain stray light. The Cassegrain optical system shading assembly comprises a primary mirror shading tube, an inner shading tube, four right trapezoid blades and at least two cylindrical sleeves. All cylindrical sleeves are concentric but different in diameter and cylinder height. The diameters are in right proportion to the cylinder heights. All cylindrical sleeves are sleeved together and fixed on the four blades according to the rule that the diameters and the cylinder heights are gradually increased. The four blades are arranged in a cross shape along the diameter directions of all the cylindrical sleeves, the cylindrical sleeve on the innermost layer is fixed with the upper bottom edges of the four blades, the upper bottom edges of all the cylindrical sleeves and the right angular sides of the four blades are arranged in the same plane, gaps between adjacent two cylindrical sleeves are equal, and the lower bottom edges of the four blades are fixed on an inner wall of the primary mirror shading tube. A material high in stray light absorbing rate is coated on surfaces of the four blades and the inner surfaces and the outer surfaces of the cylindrical sleeves. The Cassegrain optical system shading assembly achieves effective restraining of stray light under the same central obscuration ratio.
Description
Technical field
The present invention relates to the Baffle design technical field, be specifically related to a kind of Cassegrain optical system light shield device.
Background technology
Cassegrain optical system is comprised of a concave surface primary mirror and a convex surface secondary mirror, and usually in the primary mirror central openings, its focus generally is positioned at primary mirror medium pore back, and images in the primary mirror back, and its focus is called Cassegrainian focus.
In the space environment that Cassegrain optical system is operated in beyond the optical system visual field mostly and bias light is stronger, when parasitic light is very strong, if do not carry out establishment, non-imaging (being parasitic light) is detected device and receives, will cause that signal to noise ratio (S/N ratio) descends, detector can't be surveyed when serious, in order to reduce the impact of space environment parasitic light, generally will be for Cassegrain optical system adds suitable light shield, to suppress the parasitic light in the space environment.
As shown in Figure 1, existing Cassegrain optical system light shield is mainly by primary mirror cone 1, secondary mirror cone 2 and interior cone 3 form, these three cones are the circular platform type sleeve, and its inside forms by a plurality of baffle vanes, the edge of primary mirror cone 1 inwall and primary mirror is fixed, secondary mirror cone 2 is fixed on primary mirror cone 1 inwall by three support bars, interior cone 3 is fixed in the center pit of primary mirror, all apply the material with high parasitic light absorptivity on the inwall of these three cones and all baffle vanes, its role is to make parasitic light by incident outside the Cassegrain optical system visual field after the repeatedly absorption and diffuse reflection of inwall and a plurality of baffle vanes, make parasitic light satisfy certain veiling glare glancing incidence to Cassegrain optical system, utilize the TracePro ray-tracing software (generally to be used for illuminator, optical analysis, the light simulation software of radiometric analysis and photometric analysis) it is analyzed, the point-source transmisson that calculates than curve as shown in Figure 2, when stronger parasitic light incident is arranged, incident angle has obvious peak value when being 30 ° and 55 °, have a large amount of parasitic light light to be directly incident on the primary mirror minute surface this moment, if eliminate this part light, can only lengthen the length of primary mirror cone 1 or the radius of increase secondary mirror cone 2, but the length that increases primary mirror cone 1 can make the volume of whole Cassegrain optical system and body weight become large, seem very heavy, underaction, and the radius that increases secondary mirror cone 2 can increase the central obscuration ratio of Cassegrain optical system, the detectivity of optical system is decreased, thereby, existing Cassegrain optical system light shield is not accomplished the establishment to parasitic light, therefore, in the urgent need to developing a kind of in the situation that the identical central the ratio of obstruction, Cassegrain optical system light shield device that can also the establishment parasitic light.
Summary of the invention
In order to solve the problem that existing Cassegrain optical system light shield can't the establishment parasitic light, the invention provides a kind of Cassegrain optical system light shield device.
The present invention is that the technical scheme that adopts of technical solution problem is as follows:
The Cassegrain optical system light shield device comprises the primary mirror cone that is fixedly linked with the primary mirror edge and the interior cone that is fixed in the primary mirror center pit; Also comprise four meet at right angles trapezoidal blade and at least two cylindrical sleeves, all cylindrical sleeves are concentric but different-diameter and post are high, diameter is directly proportional with post is high, the order that increases progressively successively according to diameter and post height is set in together all cylindrical sleeves and be separately fixed on four blade, four blades arrange along the diametric(al) across of all cylindrical sleeves, the upper base of innermost layer cylindrical sleeves and four blades is fixed, the upper bottom surface of all cylindrical sleeves all with the right-angle side of four blades in same plane, spacing between adjacent two cylindrical sleeves equates, the spacing size will guarantee that Cassegrain optical system is not blocked when the maximum functional field angle, four bottoms of described four blades all are fixed on the described primary mirror cone inwall; Described four blade surfaces and all cylindrical sleeves surfaces externally and internallies all apply the material with high parasitic light absorptivity.
Described primary mirror cone is two different circular platform type sleeves of size with interior cone, its inside forms by a plurality of baffle vanes, the number of baffle vane is decided according to affiliated primary mirror cone and the size of interior cone, all applies the material with high parasitic light absorptivity on the inwall of described primary mirror cone and interior cone and affiliated all baffle vanes thereof.
Described innermost layer cylindrical sleeves and secondary mirror edge are fixedly linked, and its radius determines by inferior aperture of mirror, and its post is high in the upper base edge lengths of blade.
The bottom length of described blade is high and less than the length of described primary mirror cone greater than the post of described outermost layer cylindrical sleeves.
The invention has the beneficial effects as follows: the present invention adopts the blade of the trapezoidal chip architecture that meets at right angles of four cruciform settings and the mode of multilayer ring-type window shutter combination to replace existing secondary mirror cone, cooperation primary mirror cone and the realization of interior cone suppress the parasitic light in the Cassegrain optical system and eliminate, compare with existing Cassegrain optical system light shield, can find out than curve by point-source transmisson, at aspect of performance, light shield device of the present invention can realize in the situation that the identical central the ratio of obstruction to the establishment of parasitic light, and inhibiting effect will obviously be better than existing Cassegrain optical system light shield, and this has illustrated superiority and the rationality of this novel combined parasitic light light shield device design that disappears of the present invention.
Description of drawings
Fig. 1 is the structural representation of existing Cassegrain optical system light shield;
Fig. 2 utilizes the TracePro ray-tracing software that the light shield among Fig. 1 is carried out the point-source transmisson that analytical calculation obtains to compare curve synoptic diagram;
Fig. 3 is the structural representation of Cassegrain optical system light shield device of the present invention;
Fig. 4 is the structural representation of the Cassegrain optical system light shield device inside among Fig. 3;
Fig. 5 utilizes the TracePro ray-tracing software that the light shield device among Fig. 3 is carried out the point-source transmisson that analytical calculation obtains to compare curve synoptic diagram.
Among the figure: 1, primary mirror cone, 2, the secondary mirror cone, 3, interior cone, 4, blade, 5, the ring-type window shutter.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
As shown in Figure 3, Cassegrain optical system light shield device of the present invention, aluminium is as its rapidoprint, because aluminium has advantages of that density is little and price is low, therefore alleviated the weight of light shield device, realize the light-weight design requirement, this light shield device mainly is comprised of primary mirror cone 1, interior cone 3, blade 4 and ring-type window shutter 5; Primary mirror cone 1 is the circular platform type sleeve, its inside is comprised of a plurality of baffle vanes, the size of the number of baffle vane and size setting and primary mirror cone 1 adapts and gets final product, all apply the material with high parasitic light absorptivity on primary mirror cone 1 inwall and all baffle vanes thereof, the edge of primary mirror is fixed on primary mirror cone 1 inwall by cementing agent; Interior cone 3 is the circular platform type sleeve, its inside is comprised of a plurality of baffle vanes, the size of the number of baffle vane and size setting and interior cone 3 adapts and gets final product, all apply the material with high parasitic light absorptivity on interior cone 3 inwalls and all baffle vanes thereof, interior cone 3 is fixed in the center pit of primary mirror by cementing agent.
As shown in Figure 4, ring-type window shutter 5 by at least two with one heart but the high cylindrical sleeves of different-diameter and post form, diameter is directly proportional with post is high, be that diameter is larger, post Gao Yueda then, all cylindrical sleeves except diameter and post high different, other parameter (material, thickness etc.) all identical, the order that all cylindrical sleeves increase progressively successively according to diameter and post height is set in together and forms ring-type window shutter 5, all cylindrical sleeves inside surfaces and outside surface all apply the material (a kind of material well known in the art) with high parasitic light absorptivity, innermost layer cylindrical sleeves and secondary mirror edge are fixed by cementing agent, the radius of innermost layer cylindrical sleeves is determined by inferior aperture of mirror, the radius of outermost layer cylindrical sleeves is determined than common by the central obscuration of primary event light and Cassegrain optical system, spacing between per two adjacent cylindrical sleeves equates, the spacing size will guarantee that Cassegrain optical system is not blocked when the maximum functional field angle, according to parameter and the requirement of distance between the two of innermost layer and outermost layer cylindrical sleeves, calculate the number of cylindrical sleeves, spacing between adjacent two cylindrical sleeves and each cylindrical sleeves parameter; Blade 4 is the right-angled trapezium chip architecture, be used for connecting ring-type window shutter 5 and primary mirror cone 1, its whole surface all applies the material with high parasitic light absorptivity, each length of side of blade 4 (comprises the base, the bottom, right-angle side and hypotenuse) parameter determines jointly by ring-type window shutter 5 and primary mirror cone 1, the upper base of blade 4 is that the post height of the innermost layer cylindrical sleeves in length and the ring-type window shutter 5 of minor face is identical, the bottom of the blade 4 i.e. length on long limit is high and less than the length of primary mirror cone 1, the right-angle side length of blade 4 should adapt with the radius of primary mirror cone 1 greater than the post of the outermost layer cylindrical sleeves in the ring-type window shutter 5.
In the present embodiment, cylindrical sleeves in the ring-type window shutter 5 is four, blade 4 also is four, as shown in Figure 4, each cylindrical sleeves is divided into four 90 ° of arc structures that parameter is identical, at first four 90 ° of arc structures of innermost layer cylindrical sleeves and four upper bases (being minor face) of four blades 4 are welded and fixed together, then the spacing between adjacent two cylindrical sleeves that go out according to calculated in advance, the order that three cylindrical sleeves of residue are increased progressively successively according to diameter and post height is weldingly fixed on four blades 4 successively, the upper bottom surface of innermost layer cylindrical sleeves, the upper bottom surface of second layer cylindrical sleeves, the upper bottom surface of the 3rd layer of cylindrical sleeves and the upper bottom surface of outermost layer cylindrical sleeves all with four right-angle sides of four blades 4 in same plane, the across setting on four diametric(al)s of four cylindrical sleeves of four blades 4, after having assembled blade 4 and ring-type window shutter 5, four bottoms of these four blades 4 (i.e. long limit) is fixed on the inwall of primary mirror cone 1.
As shown in Figure 5, utilize the TracePro ray-tracing software that Cassegrain optical system light shield device of the present invention is analyzed, calculate point-source transmisson and compare curve, can find out than curve by this point-source transmisson, when stronger parasitic light incident is arranged, from incident angle greater than 15 °, the point-source transmisson of Cassegrain optical system reduces than gradually, show thus, Cassegrain optical system light shield device of the present invention obviously is better than existing Cassegrain optical system light shield for the inhibiting effect of parasitic light.
Claims (4)
1. the Cassegrain optical system light shield device comprises the primary mirror cone that is fixedly linked with the primary mirror edge and the interior cone that is fixed in the primary mirror center pit; It is characterized in that, also comprise four meet at right angles trapezoidal blade and at least two cylindrical sleeves, all cylindrical sleeves are concentric but different-diameter and post are high, diameter is directly proportional with post is high, the order that increases progressively successively according to diameter and post height is set in together all cylindrical sleeves and be separately fixed on four blade, four blades arrange along the diametric(al) across of all cylindrical sleeves, the upper base of innermost layer cylindrical sleeves and four blades is fixed, the upper bottom surface of all cylindrical sleeves all with the right-angle side of four blades in same plane, spacing between adjacent two cylindrical sleeves equates, the spacing size will guarantee that Cassegrain optical system is not blocked when the maximum functional field angle, four bottoms of described four blades all are fixed on the described primary mirror cone inwall; Described four blade surfaces and all cylindrical sleeves surfaces externally and internallies all apply the material with high parasitic light absorptivity.
2. Cassegrain optical system light shield device according to claim 1, it is characterized in that, described primary mirror cone is two different circular platform type sleeves of size with interior cone, its inside forms by a plurality of baffle vanes, the number of baffle vane is decided according to affiliated primary mirror cone and the size of interior cone, all applies the material with high parasitic light absorptivity on the inwall of described primary mirror cone and interior cone and affiliated all baffle vanes thereof.
3. Cassegrain optical system light shield device according to claim 1 is characterized in that, described innermost layer cylindrical sleeves and secondary mirror edge are fixedly linked, and its radius determines by inferior aperture of mirror, and its post is high in the upper base edge lengths of blade.
4. Cassegrain optical system light shield device according to claim 1 is characterized in that, the bottom length of described blade is high and less than the length of described primary mirror cone greater than the post of described outermost layer cylindrical sleeves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102703007A CN103309125A (en) | 2013-06-28 | 2013-06-28 | Cassegrain optical system shading assembly |
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| CN2013102703007A CN103309125A (en) | 2013-06-28 | 2013-06-28 | Cassegrain optical system shading assembly |
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| CN103309125A true CN103309125A (en) | 2013-09-18 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466470A (en) * | 2015-12-16 | 2016-04-06 | 中国科学院长春光学精密机械与物理研究所 | Large space optical remote sensor composite light blocking plate |
| CN109387994A (en) * | 2017-08-04 | 2019-02-26 | 北京空间机电研究所 | A kind of secondary mirror hood for space large caliber camera |
| CN111929967A (en) * | 2020-08-12 | 2020-11-13 | 中国科学院光电技术研究所 | Light shield system with high stray light rejection ratio and design method thereof |
| CN112255865A (en) * | 2020-10-30 | 2021-01-22 | 中国科学院长春光学精密机械与物理研究所 | Ultra-light carbon fiber remote sensing camera structure |
| CN112578525A (en) * | 2019-09-11 | 2021-03-30 | 大立光电股份有限公司 | Imaging lens module, camera module and electronic device |
| CN114408226A (en) * | 2022-01-19 | 2022-04-29 | 中国科学院长春光学精密机械与物理研究所 | Paraffin temperature sensing element and shutter adjusting mechanism based on thermal control of paraffin temperature sensing element |
| WO2023087920A1 (en) * | 2021-11-16 | 2023-05-25 | Oppo广东移动通信有限公司 | Light-shielding assembly and preparation method therefor, optical lens, camera, and electronic device |
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| US4929055A (en) * | 1988-09-19 | 1990-05-29 | Jones Peter W J | Anti-reflection technique |
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| US20110176205A1 (en) * | 2008-11-20 | 2011-07-21 | Bae Systems Information And Electronic Systems Integration Inc. | Integrated telescope baffle and mirror support |
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| US4929055A (en) * | 1988-09-19 | 1990-05-29 | Jones Peter W J | Anti-reflection technique |
| US20110176205A1 (en) * | 2008-11-20 | 2011-07-21 | Bae Systems Information And Electronic Systems Integration Inc. | Integrated telescope baffle and mirror support |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466470A (en) * | 2015-12-16 | 2016-04-06 | 中国科学院长春光学精密机械与物理研究所 | Large space optical remote sensor composite light blocking plate |
| CN109387994A (en) * | 2017-08-04 | 2019-02-26 | 北京空间机电研究所 | A kind of secondary mirror hood for space large caliber camera |
| CN112578525A (en) * | 2019-09-11 | 2021-03-30 | 大立光电股份有限公司 | Imaging lens module, camera module and electronic device |
| CN112578525B (en) * | 2019-09-11 | 2023-01-31 | 大立光电股份有限公司 | Imaging lens module, camera module and electronic device |
| CN111929967A (en) * | 2020-08-12 | 2020-11-13 | 中国科学院光电技术研究所 | Light shield system with high stray light rejection ratio and design method thereof |
| CN111929967B (en) * | 2020-08-12 | 2021-09-17 | 中国科学院光电技术研究所 | Light shield system with high stray light rejection ratio and design method thereof |
| CN112255865A (en) * | 2020-10-30 | 2021-01-22 | 中国科学院长春光学精密机械与物理研究所 | Ultra-light carbon fiber remote sensing camera structure |
| WO2023087920A1 (en) * | 2021-11-16 | 2023-05-25 | Oppo广东移动通信有限公司 | Light-shielding assembly and preparation method therefor, optical lens, camera, and electronic device |
| CN114408226A (en) * | 2022-01-19 | 2022-04-29 | 中国科学院长春光学精密机械与物理研究所 | Paraffin temperature sensing element and shutter adjusting mechanism based on thermal control of paraffin temperature sensing element |
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Application publication date: 20130918 |