CN104880749B - Large-hole diameter highly-lightweight glass reflector - Google Patents
Large-hole diameter highly-lightweight glass reflector Download PDFInfo
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- CN104880749B CN104880749B CN201510271959.3A CN201510271959A CN104880749B CN 104880749 B CN104880749 B CN 104880749B CN 201510271959 A CN201510271959 A CN 201510271959A CN 104880749 B CN104880749 B CN 104880749B
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- reflecting mirror
- reflector
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- radius
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/10—Mirrors with curved faces
Abstract
A large-hole diameter highly-lightweight glass reflector is of a round structure adopting the microcrystalline glass material. A front surface of the round structure is a plane of reflection (3), and a back surface of the round structure is a lightweight recessed surface (4). The plane of reflection (3) is an aspheric surface, and a radius of curvature R of each point on the aspheric surface meets a specific relational expression. The lightweight recessed surface (4) is a spherical surface, and a spherical radius is an average value of radiuses of curvature of a central point and at least two edge points on the plane of reflection (3). Lightening holes (2) are formed in the circumference of the round structure and are uniformly distributed in the circumferential direction of a reflector (1). The invention firstly brings forward a lightweight idea of double-concave and circumferential stepped lightening hole applied to the glass reflector; the mass of the large-hole diameter reflector is greatly reduced under a condition that the rigidity of the reflector is ensured; the installation adjustment and unloading difficulty is lowered, the weight of a satellite actual load is reduced at the same time, and the launch cost is reduced.
Description
Technical field
The invention belongs to aerospace optical remote sensing technical field, is related to a kind of lightweight configuration of large caliber reflecting mirror, can answer
For the design and preparation of spaceborne heavy caliber glass reflector.
Background technology
The bore of star-loaded optical remote sensing device camera lens constantly increases, and the lightweight to large caliber reflecting mirror proposes higher wanting
Ask.At present, heavy caliber glass reflector typically using by the way of processing open or semi-enclosed lightening core (groove) at back come
Realize lightweight.Opening-type includes：Circular apertures, honeycomb hole, square opening, tri-angle-holed, scallop hole etc..
Reflecting mirror mostly is disc-shape, very strong along disk axial rigidity, relatively weak along disk radial rigidity, reflecting mirror master
The deformation to be produced is moment of flexure deformation radially.Therefore, will for the impact of reflecting mirror radial rigidity along back side perforate
It is far longer than along reflecting mirror circumference perforate.In order to make up impact of the back side perforate to its rigidity, designing reflecting mirror opening-type more
It is stable shaped for mechanics such as triangle, honeycomb types, so and to processing cause very big difficulty.
The content of the invention
Present invention solves the technical problem that being：Overcome the deficiencies in the prior art, there is provided a kind of circumferential perforate back concave surface
The light glass reflector structure of design, can greatly reduce impact of the reflecting mirror lightweight to its rigidity, while also reducing
The difficulty of reflecting mirror lightweight processing.
The present invention technical solution be：A kind of high light glass reflector of heavy caliber, reflecting mirror is devitrified glass
The circular configuration of material, the front of the circular configuration is reflecting surface, and to mitigate concave surface, reflecting surface is aspheric surface and aspheric at the back side
The radius of curvature R of each point meets following relational expression on face,
Wherein y=f (x) is the curvilinear equation of reflecting surface, and there is first derivative f ' (x) with second dervative f " (x)；Mitigate
Concave surface is sphere and the radius of a ball is the central point on reflecting surface and the meansigma methodss of the radius of curvature R of at least two edges point；It is described
The circumferential position of circular configuration reduce light holes and lightening core is uniformly distributed along the circumferencial direction of reflecting mirror.
Described lightening core is stepped and fillet is left in ladder transition face junction.The depth capacity of lightening core is not more than
6 times of stepped minimum step width.
Described mitigation concave surface is non-polished, non-plated film.
Present invention advantage compared with prior art is：
(1) present invention proposes a kind of lightweight mode of the reflecting mirror for more optimizing, under identical light weight degree, the back of the body
Portion mitigates concave surface and adds the circumferential lightweight form for reducing light holes to possess more preferable mechanical property than the mode that lightweight hole is opened at back；
(2) lightweight form that mitigation concave surface in back of the present invention circumferentially reduces light holes makes the processing of reflecting mirror more simple,
Reflecting mirror manufacturing cost is reduced, the process-cycle is shortened；
(3) lightweight mode of the invention makes the quality of large caliber reflecting mirror mitigate significantly, alleviates and debugs and unload hardly possible
Degree, while decreasing the weight of Satellite Payloads, reduces launch cost.
Description of the drawings
Fig. 1 is reflecting mirror of the present invention forward direction sectional view；
Fig. 2 is reflecting mirror side sectional view of the present invention；
Fig. 3 is present invention reflection surface curve and the curve rounding approximate diagram for mitigating surface curve；
Fig. 4 is the lightening core envelope diagram of reflecting mirror of the present invention.
1 is reflecting mirror in figure, and 2 is lightening core, and 3 is reflecting surface, and 4 mitigate surface curve to mitigate concave surface, 5, and 6 is that reflecting surface is bent
Line, a mirror body thickness, h surplus material thickness.
Specific embodiment
The high light glass reflector 1 of heavy caliber of present invention design, its mechanics principle is mainly in accordance with the mechanics of materials " beam "
Flexural deformation it is theoretical.Deform size to be inversely proportional to the moment of inertia in section；And the moment of inertia is relevant with the geometric distribution of material：
To separating along bending direction upper and lower surface, its moment of inertia is bigger；Conversely, concentrating to central core, its moment of inertia is just
It is less.Therefore the reflecting mirror 1 of the present invention is designed as disymmetry concave surface (head-on reflection face 3, back mitigates concave surface 4) and circumferentially reduces gently
The lightweight form in hole 2.
Due to the good thermal stability of devitrified glass, the material of main part of reflecting mirror 1 adopts devitrified glass.With removal material side
Formula processes lightening core 2, and lightening core 2 is located at the circumferential position of reflecting mirror 1 and is uniformly distributed along the circumferencial direction of reflecting mirror 1.Reflecting mirror 1
The back side design mitigate concave surface 4, and with 3 one-tenth of head-on reflection face symmetric shape.Whole reflecting mirror 1 is designed for symmetrically mode, is protected
The mechanical property of card reflecting mirror 1, temperature characterisitic are uniformly distributed, and are more beneficial for the guarantee of the surface precision of reflecting mirror 1, make reflecting mirror
1 debug is more simple.
The face type in head-on reflection face 3 is by optical design determination, mostly non-spherical structure.Mitigate concave surface 4 by reflection
The face shape parameter of face 3 is simplified and rounding, adopts the spherical shape approximate with the face type of reflecting surface 3.
Because the reflecting surface 3 of reflecting mirror 1 is circumference symmetrical structure, therefore three-dimensional reflection face 3 can be reduced to two-dimentional reflection
Surface curve 6, by being that the method for mitigating surface curve 5 obtains the spherical radius for mitigating concave surface 4 by the reflection rounding of surface curve 6.According to
The characteristics of non-spherical reflector reflecting surface, the power of the curvilinear equation of surface curve 6 is reflected more than or equal to secondary, and for full curve,
So there is second dervative in reflection surface curve 6.
Radius of curvature of the reflection surface curve 6 in certain point is R, and R is tried to achieve by below equation：
Wherein y=f (x) is the curvilinear equation for reflecting surface curve 6, and reflection surface curve 6 has single order, second dervative and is respectively
Y '=f ' (x), y "=f " are (x).
To make mitigation surface curve 5 and reflection surface curve 6 more close approximation, if the place of doing is entered in optional head-on reflection face 3
Row radius of curvature is solved, and is averaged as the arc radius for mitigating surface curve 5, and the selection of radius of curvature solution point must include
2 points of largest contours boundary point M, N (as shown in Figure 3) of the reflection most recess summit O points of surface curve 6 and reflecting mirror 1, between MN bright spots
Air line distance length be equal to the diameter of reflecting mirror 1, remaining each point can be chosen on the reflection surface curve 6 between 2 points of MN, respectively
Selected point will and paired appearance symmetrical with respect to O points, selected point uniformly occurs on reflection surface curve 6 as far as possible, to ensure to subtract
Light surface curve 5 and the reflection close approximation in the diameter range of reflecting mirror 1 of surface curve 6.
Mitigate concave surface 4 and do not do polishing and coating film treatment.The difficulty of processing of reflecting mirror is so greatly reduced, shortens processing week
Phase.
The design of lightening core 2 need to meet the rigidity requirement of whole reflecting mirror 1, and Fig. 4 is to mitigate concave surface 4 on reflecting mirror 1 and mitigate
The schematic diagram of the position relationship of hole 2, mirror body thickness a and surplus material thickness h are determined by the height of the design of reflecting mirror 1.Generally
Mirror body thickness a primarily determines that mirror thickness rate is relevant with the material therefor of reflecting mirror 1, according to devitrified glass by the mirror thickness rate of reflecting mirror 1
The physical characteristics of material, conventional mirror thickness rate is between 8-10.Material thickness h machines mitigation concave surface 4 and mitigates for reflecting mirror 1
The remaining monolateral material thickness in hole 2, ensures that reflecting mirror 1 has enough rigidity by controlling surplus material thickness h.Generally remaining material
, the surplus material of reflecting mirror diameter 500mm to 1m between proportional with mirror diameter during material thickness h initial designs
Thickness h is between 2-5mm.After the Preliminary design of reflecting mirror 1, the calculating and finite element simulation by physical property iterates and sets
Meter parameter, finally determines design result.
According to Fig. 4, for ease of processing, the multiselect regular shape of lightening core 2, its size shape must not determine and surpass mitigation face
Curve 5 and the envelope region produced by reflection surface curve 6 to the bias internal surplus material wall thickness h of reflecting mirror 1.In the present invention, mitigate
Hole 2 is stairstepping, and step size becomes with mitigation surface curve 5 in reflecting mirror 1 with thickness change determined by reflection surface curve 6
Change, it is ensured that the material wall thickness of reflecting mirror 1 is basically identical, and the surrounding material thickness of lightening core 2 is basically identical.After basic parameter determines,
The material wall thickness of reflecting mirror 1 being checked by computer sim- ulation means and meeting its rigidity requirement, lightening core 2 is using stairstepping and maximum deep
Degree is not more than 6 times near center of circle direction most inner side step width, and so design makes the processing of reflecting mirror more simple, lightening core
Corresponding technique fillet is designed in 2 each face junction, sharp corner is it also avoid while easy to process and produces stress concentration, makes anti-
Mirror 1 is penetrated with more preferable mechanical property.
Reflecting mirror 1 is obtained with preferable mechanical property by such scheme, weight reduction rate reaches more than 75%.
Embodiment
The maximum gauge 546mm of design reflecting mirror 1, the blank material of reflecting mirror 1 adopts the devitrified glass of good thermal stability
Material.The face type of reflecting surface 3 of reflecting mirror 1 is designed by system optics and determined, its aspheric surface face type equation：Y=2054.76X+
0.028485X2, mirror thickness rate parameter is set to 8, obtains mirror body thickness a and be approximately equal to 69mm.Determined according to aspherical equation
The X position of the most recess summit O of reflectivity curve 6 is -36067.4, according to the maximum gauge 546mm of reflecting mirror 1,6 liang of reflectivity curve
The X position at end is respectively：- 35794.4 and -36340.4.According to the value of this 3 point X, by formula (1) draw reflectivity curve 6 this
Radius of curvature at 3 points, three radius of curvature are averaged be mitigated surface curve 5 radius be 1021.97mm, it is ensured that
Mitigation concave surface 4 is symmetrical to reflecting surface 3 and face type is similar.
Reflecting mirror 1 is supported with three point modes and fixed, and along the circumferential direction designs three fixing holes, the uniform cloth of remaining circumferential position
Lightening core 2 is put, according to material wall thickness approaches uniformity principle, calculating according to the diameter of reflecting mirror 1 and by physical property and limited
Unit's emulation obtains surplus material thickness h=2.1mm.The sapwood material wall thickness of lightening core 2 four is approximately equal to surplus material thickness h, according to
This parameter lightening core 2 lays totally 15 groups, and the depth capacity of lightening core 2 is designed as 5.8 times of minimum step width.According to reflecting mirror 1
Axis thickness change design lightening core 2 is made up of four steps, step dimension and reflecting surface 1 and the mitigation face shape parameter phase of concave surface 4
Close, it is R=5mm to design each face junction fillet size of lightening core 2 according to step dimension.Reflecting mirror 1 is determined by computer sim- ulation
Stock thickness ensure its mechanical property.
Complete according to the reflecting mirror of this lightweight conceptual design is machined.Through test：Weight reduction rate is more than 75%, optical axis
Under level conditions, reflecting mirror surface shape precision is better than 0.02 λ, meets use requirement.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (4)
1. the high light glass reflector of a kind of heavy caliber, it is characterised in that：Reflecting mirror (1) is tied for the circle of microcrystal glass material
Structure, the front of the circular configuration is reflecting surface (3), and to mitigate concave surface (4), reflecting surface (3) is aspheric surface and aspheric surface at the back side
The radius of curvature R of upper each point meets following relational expression,
Wherein y=f (x) is the curvilinear equation of reflecting surface (3), and there is first derivative f ' (x) with second dervative f " (x)；Mitigate
Concave surface (4) is for sphere and the radius of a ball is the average of the radius of curvature R of the central point on reflecting surface (3) and at least two edges point
Value；The circumferential position of described circular configuration reduces light holes (2) and lightening core (2) uniformly divides along the circumferencial direction of reflecting mirror (1)
Cloth.
2. the high light glass reflector of a kind of heavy caliber according to claim 1, it is characterised in that：Described lightening core
(2) for stepped and fillet is left in ladder transition face junction.
3. the high light glass reflector of a kind of heavy caliber according to claim 2, it is characterised in that：Described lightening core
(2) depth capacity is not more than 6 times of stepped minimum step width.
4. the high light glass reflector of a kind of heavy caliber according to claim 1 or 2 or 3, it is characterised in that：Described
Mitigate concave surface (4) non-polished, non-plated film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510271959.3A CN104880749B (en) | 2015-05-25 | 2015-05-25 | Large-hole diameter highly-lightweight glass reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510271959.3A CN104880749B (en) | 2015-05-25 | 2015-05-25 | Large-hole diameter highly-lightweight glass reflector |
Publications (2)
| Publication Number | Publication Date |
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| CN104880749A CN104880749A (en) | 2015-09-02 |
| CN104880749B true CN104880749B (en) | 2017-04-19 |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003535807A (en) * | 2000-06-20 | 2003-12-02 | ショット、グラス、テクノロジーズ、インコーポレイテッド | Glass ceramic composite |
| JP3842122B2 (en) * | 2001-12-14 | 2006-11-08 | 三菱電機株式会社 | Lightweight mirror |
| CN2702331Y (en) * | 2004-06-22 | 2005-05-25 | 中国科学院上海技术物理研究所 | Space use light weight ellipsoid double face scanning lens |
| CN201159777Y (en) * | 2007-11-27 | 2008-12-03 | 北京空间机电研究所 | Heavy caliber light glass reflector |
| CN101482643B (en) * | 2009-02-23 | 2010-09-22 | 中国科学院光电技术研究所 | Bidimensional large-diameter fast control reflection mirror |
| JP2013029537A (en) * | 2011-07-26 | 2013-02-07 | Sumitomo Heavy Ind Ltd | Concentrator and concentration apparatus including the same |
| US9599756B2 (en) * | 2011-08-01 | 2017-03-21 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for manufacturing a mirror comprising at least one cavity and optical mirror |
| CN103217777B (en) * | 2013-04-12 | 2015-01-07 | 中国科学院西安光学精密机械研究所 | Large-diameter main reflecting mirror |
| CN204143042U (en) * | 2014-06-06 | 2015-02-04 | 苏州华徕光电仪器有限公司 | A kind of large caliber reflecting mirror primary mirror support structure |
| CN204188863U (en) * | 2014-10-23 | 2015-03-04 | 中国工程物理研究院总体工程研究所 | A kind of large caliber reflecting mirror back support device |
| CN104536116A (en) * | 2014-12-25 | 2015-04-22 | 中国科学院长春光学精密机械与物理研究所 | Multi-directional flexible supporting structure of oversized-aperture optical reflector |
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