CN115437101A - Light metal reflector structure with wide environmental adaptation range - Google Patents
Light metal reflector structure with wide environmental adaptation range Download PDFInfo
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- CN115437101A CN115437101A CN202211163205.2A CN202211163205A CN115437101A CN 115437101 A CN115437101 A CN 115437101A CN 202211163205 A CN202211163205 A CN 202211163205A CN 115437101 A CN115437101 A CN 115437101A
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- back plate
- reflector
- mirror
- mirror body
- flexible
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/181—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a light metal reflector structure with a wide environment adaptation range, which relates to the technical field of optical imaging and measurement and comprises a reflector body, wherein a disc body is formed by a plurality of triangular structures, and a back plate connecting surface is arranged on the reflector body; the back plate is supported by three points through a back plate connecting surface and is connected to the mirror body, and the back plate is formed by an internal rigid end and an external flexible end; the connecting part is used for connecting and fixing the mirror body and the back plate and positioning the mirror body and the back plate through the positioning pin. The back plate adopts the design of combining high rigidity and high flexibility, thereby greatly reducing the deformation of the back plate and the mirror body mounting surface and ensuring the high precision of the mirror surface; a three-way rod-shaped flexible structure is designed, radial and axial deformation can be realized simultaneously, so that installation and temperature stress are eliminated, and good mechanical properties are ensured; the reflector has compact structure, light weight due to the adoption of light metal materials, and temperature adaptability and mechanical adaptability.
Description
Technical Field
The invention relates to the technical field of optical imaging and measurement, in particular to a light metal reflector structure with a wide environment adaptation range.
Background
Aviation and near space photoelectric loads are one of main load forms of space remote sensors, are important technical means for acquiring ground information, and are widely loaded on a man-machine or an unmanned machine. The environmental adaptability is one of the main technical indexes for measuring the photoelectric load performance of aviation and adjacent space, and comprises natural environmental adaptability and mechanical environmental adaptability. The natural environment generally includes factors such as air pressure, temperature, damp and hot, mold, salt fog and the like when the photoelectric load works or is stored, and the mechanical environment generally includes factors such as impact, vibration, acceleration and the like when the photoelectric load works or is stored. Mirrors inside the photovoltaic load, especially the primary mirror and the secondary mirror, directly affect the photovoltaic load performance, and thus the mirrors inside the photovoltaic load are required to have good environmental suitability.
The reflector in the photoelectric load is designed mainly from four aspects of structural form, material, coating and surface treatment for the environmental adaptability. By reasonably selecting the reflector material and the surface treatment mode and plating the three-proofing protective film, the environmental adaptability problems of air pressure, damp heat, mould and salt mist during the working or storage of the reflector can be solved, and the reflector has a mature solution at present; however, the performance of the reflector in different temperature environments and mechanical environments can be solved only by structural design;
according to actual measurement, when the flying height is 20000m, the ambient temperature can reach about-90 ℃ at the lowest, but the photoelectric load is produced and assembled at normal temperature (20 ℃), and when the photoelectric load internal reflector and the supporting structure are used at low temperature, the photoelectric load internal reflector and the supporting structure are different in thermal deformation due to different materials and structural forms, so that the surface accuracy of the reflector is reduced, and the imaging quality is seriously influenced; when the weight, the volume and the power consumption of the system are allowed, the temperature of the photoelectric load can be controlled, so that the internal reflector is kept in an allowed temperature range, but when the weight, the volume and the power consumption of the system are limited, the photoelectric load cannot be effectively controlled, and the reflector is required to have wide temperature adaptability and always keep good optical performance;
the most shock, vibration or acceleration is usually generated by the aircraft during take-off, landing or extreme environments, and the shock environment is the most severe. The electrically loaded internal mirror is required not to be damaged during or after the action of the mechanical environment, and the optical performance is kept unchanged. Although the damper of the electro-optical loading system dampens the forces transmitted to the internal mirror, it does not provide complete isolation and may even amplify the shock.
In view of the above technical problems, there is a need in the art to develop a lightweight metal mirror structure with wide environmental adaptability that can maintain good optical performance, effectively improve the strength and rigidity of the mirror structure, and does not increase the weight.
Disclosure of Invention
The invention aims to provide a light metal reflector structure which can keep good optical performance of a reflector, effectively improve the strength and rigidity of the reflector structure and has a wide environment adaptation range without increasing the weight.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention relates to a light metal reflector structure with wide environmental adaptation range, which comprises:
the lens body forms a disc body through a plurality of triangular structures, and a back plate connecting surface is arranged on the lens body; and
the back plate is supported by three points through the back plate connecting surface and is connected to the mirror body, and the back plate is formed by an internal rigid end and an external flexible end;
the structure further includes:
the lens body and the back plate are fixedly connected through the connecting part and are positioned through the positioning pins.
Furthermore, a circular interface is arranged in the middle of the mirror body, a first stress groove is formed in the circular interface, and the circular interface and the mirror surface of the mirror body form a three-point connection structure through the first stress groove;
the backboard connecting surface is arranged in the middle of the first stress groove and is provided with a second stress groove, and the joint of the second stress groove and the backboard is a coplanar three-small plane, so that the mirror body and the backboard are connected at three points.
Preferably, the flatness of all three facets is 0.002mm.
Further, the connecting part 3 comprises three pressing blocks arranged along the circumference of the circular ring-shaped interface, and the flatness of the pressing blocks and the flatness of the lens body mounting surface are both 0.002mm; and
the fixing screw is matched with the pressing block, and a fixing structure is formed by the pressing block and the fixing screw so as to connect the lens body and the back plate;
briquetting and locating pin all adopt RSA6061 aluminum alloy material to make, just set screw adopts 0Cr18Ni9 material to make.
Further, the rigid end of the back plate is configured as an inner layer, and the flexible end of the back plate is configured as three outer layers which are uniformly distributed on the outer circumference of the inner layer;
one end of the back plate far away from the mirror body is configured as a mounting surface;
the outer layer comprises two inclined first flexible rods which are symmetrically arranged; and
a second flexible rod connected between two of said first flexible rods.
Preferably, the mirror body and the back plate are made of RSA6061 aluminum alloy material.
Preferably, the overall cross section of the first flexible rod and the second flexible rod is rectangular, the width of the first flexible rod is 2mm, the height of the first flexible rod is 4mm, and the included angle between the adjacent first flexible rod and the adjacent second flexible rod is 120 degrees.
In the technical scheme, the light metal reflector structure with the wide environment adaptation range provided by the invention has the following beneficial effects:
the light metal reflector with the wide environment adaptation range is simple in structure, the backboard is designed by combining high rigidity and high flexibility, deformation of the backboard and a mirror body mounting surface is greatly reduced, and high precision of a mirror surface is guaranteed;
a three-way rod-shaped flexible structure is designed, radial and axial deformation can be realized simultaneously, so that installation and temperature stress are eliminated, and good mechanical properties are ensured; the reflector has compact structure, light weight of light metal material and temperature adaptability and mechanical adaptability.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of the overall structure of a light metal reflector structure with a wide environmental adaptation range according to an embodiment of the present invention;
FIG. 2 is a top view of a lightweight metal mirror structure with a wide environmental adaptation range according to an embodiment of the present invention;
FIG. 3 is a side cross-sectional view of a lightweight metal mirror structure with a wide environmental adaptation range according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a mirror body of a light metal reflector structure with a wide environmental adaptation range according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a back plate of a light metal reflector structure with a wide environmental adaptability according to an embodiment of the present invention;
fig. 6 is a structural diagram of a compact in a lightweight metal mirror structure with a wide environmental adaptation range according to an embodiment of the present invention.
Description of the reference numerals:
1. a mirror body; 2. a back plate; 3. a connecting portion; 4. positioning pins;
101. a back plate connection face; 102. a circular interface; 103. a first stress groove; 104. a second stress groove;
201. an inner layer; 202. an outer layer; 203. a mounting surface; 2021. a first flexible rod; 2022. a second flexible rod;
301. briquetting; 302. and fixing the screw.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings.
See fig. 1-6;
the invention relates to a light metal reflector structure with wide environment adaptation range, which comprises:
the lens body 1 is a disc body formed by a plurality of triangular structures, the lens body 1 adopts a triangular lightweight structure, the rigidity is ensured, the weight is reduced, and a back plate connecting surface 101 is arranged on the lens body 1; and
the back plate 2 is supported and connected to the mirror body 1 at three points through the back plate connecting surface 101, and the back plate 2 is formed by an inner rigid end and an outer flexible end;
the structure further includes:
the lens body 1 and the back plate 2 are fixedly connected through the connecting part 3 and are positioned through the positioning pin 4.
As a further introduction of this embodiment, a circular interface 102 is disposed in the middle of the mirror body 1, a first stress groove 103 is formed in the circular interface 102, and the circular interface 102 and the mirror surface of the mirror body 1 form a three-point connection structure through the first stress groove 103;
the back plate connecting surface 101 is disposed in the middle of the first stress groove 103, and is provided with a second stress groove 104, and the joint of the second stress groove 104 and the back plate 2 is a coplanar three-facet, so that the mirror body 1 and the back plate 2 are connected at three points.
On the whole, through eliminating stress groove extension biography power route, reduce the connection stress that plane error caused through three point connection. The circular interface 102 should be axially symmetric about the center of gravity of the lens body 1 when the structure is optimal, and if the structure is not allowed, the circular interface 102 should be as close to the center of gravity of the lens body 1 as possible. The width of the connection point between the mirror surface and the circular ring-shaped interface 102 and the width of the connection point between the circular ring-shaped interface 102 and the back plate 2 need to be comprehensively determined according to the weight of the mirror body 1, the size of the fixing screw 302 and the like, and the heavier the mirror body 1 and the larger the size of the fixing screw 302 are, the larger the size of the connection point is.
By way of further introduction in this embodiment, the connecting portion 3 includes three pressing blocks 301 arranged along the circumference of the circular ring-shaped interface 102, and the flatness of the pressing blocks 301 and the mounting surface of the mirror body 1 are both 0.002mm; and
a fixing screw 302 matched with the pressing block 301, wherein a fixing structure is formed by the pressing block 301 and the fixing screw 302 so as to connect the mirror body 1 and the back plate 2; the mirror body 1, the back plate 2, the pressing block 301 and the positioning pin 4 provided by the embodiment are all made of the same material, so that the linear expansion coefficients of all structures are the same when the temperature changes, and temperature stress is not generated; the material can be selected from aluminum alloy, beryllium, silicon aluminum and the like as long as the processing requirement and the environmental adaptability are met. If the material of the mirror body 1 can meet the stress requirement of the fixing screw 302, the fixing screw 302 is made of the same material as the mirror body 1; if the material of the mirror body 1 does not meet the stress requirement of the screw 302, the fixing screw 302 can be made of high-strength materials such as stainless steel and the like, and the screw connecting position needs to be designed to eliminate stress, so that the influence of the temperature stress generated by different linear expansion coefficients on the mirror surface precision during the screw fastening moment and temperature change is avoided
Specifically, the pressing block 301 and the positioning pin 4 are both made of RSA6061 aluminum alloy material, and the fixing screw 302 is made of 0Cr18Ni9 material.
By way of further introduction to the present embodiment, the rigid end of the backplate 2 is configured as an inner layer 201, and the flexible ends of the backplate 2 are configured as three outer layers 202 uniformly distributed on the outer circumference of the inner layer 201;
one end of the back plate 2 far away from the mirror body 1 is configured as a mounting surface 203;
the outer layer 202 comprises two first flexible rods 2021 which are inclined and are symmetrically arranged with each other; and
a second flexible rod 2022 connected between the two said first flexible rods 2021.
The back plate 2 is connected with the mirror body 1 in the processing process, generally in the range of 30-60 nm of mirror body surface shape accuracy (RMS), and the change of the shape accuracy (RMS) after the connection is required to be not more than 3nm. After the back plate 2 is connected with the mirror body 1, the flatness of the external mounting surface 203 of the back plate 2 is measured again, the requirement is better than 3nm, and when the requirement is not met, the requirement is met through grinding or other methods.
As a preferable technical solution of this embodiment, the radial stress caused by connection or temperature is eliminated by the in-plane (backplate radial) deformation of the first flexible rod 2021, and the axial stress caused by the plane error of the mounting surface is eliminated by the in-plane (backplate axial) deformation of the second flexible rod 2022 in the vertical plane; the inner layer 201 is designed to be high in rigidity, the flatness of the mounting surface (three small planes) reaches 0.002mm through means of single-point diamond turning or grinding, the high-rigidity design ensures that the inner layer mounting surface keeps high flatness when the outer layer is flexibly deformed, and the influence of the outer layer flexible deformation on the mirror surface precision is eliminated. The sizes of the first flexible rod 2021 and the second flexible rod 2022 need to be determined according to the total weight of the mirror body 1 and the back plate 2 through surface shape analysis and stress analysis.
As a preferred technical solution of this embodiment, the mirror body 1 and the back plate 2 are made of RSA6061 aluminum alloy material. Wherein, the flatness of the mirror body 1 and the mounting surface 203 is processed to be better than 0.002mm by adopting a single-point diamond turning machine, and the flatness of the mounting surface of the pressing block 301 is processed to be better than 0.002mm by adopting a grinding method.
As a preferred technical solution of this embodiment, the overall cross-section of the first flexible rod 2021 and the second flexible rod 2022 is rectangular, the width of the overall cross-section is 2mm, the height of the overall cross-section is 4mm, an included angle between the adjacent first flexible rod 2021 and the second flexible rod 2022 is 120 °, the width of a stress relief groove of the mirror body 1 is 1mm, the width of a connection point between the mirror surface and the circular ring-shaped interface 102 is 7mm, and the width of a connection node between the circular ring-shaped interface 102 and the back plate 2 is 17.6mm.
And after the mirror body 1 and the back plate 2 are mechanically and finely processed, carrying out black dyeing treatment on the surfaces of the parts.
When the surface shape precision (RMS) of the mirror body 1 is better than 35nm, the mirror body 1 and the back plate 2 are arranged together by using a fixing screw 302 and a pressing block 301 and are matched as pins, the gap between each pin and a pin hole is 0.002-0.003 mm, the mirror body 1 is ensured not to be extruded by the pins, and the pins and the fixing screw 302 are fixed by adopting silicon rubber; detecting the surface shape of the lens body 1 after connection, when the surface shape (RMS) of the lens surface is better than 40nm, indicating that the connection is effective, otherwise, reconnecting is required; after effective connection, detecting the flatness of the mounting surface 203 of the back plate 2, wherein the flatness can reach 0.002-0.003 mm, otherwise, grinding until the flatness meets the requirement;
the light metal reflector shown in the attached figure of the embodiment has the caliber of 150mm and the axial height of 35mm, and after the connection between the reflector body and the back plate is finished, the light metal reflector except for the mounting surface and the mirror surface is subjected to matting paint spraying and sand blasting treatment; after the mirror surface shape (RMS) is processed to be better than 15nm, the reflecting film and the three-proofing film are plated with aluminum.
Through analysis, the reflector can adapt to the temperature difference of 80 ℃ (20 ℃ -60 ℃), can bear 100g of half-sine impact (4 ms), and has the weight not more than 350g. Wherein, when the maximum stress is Z direction (axial), the flexible joint position of the back plate is 147Mpa, which is not more than RSA6061 aluminum alloy proportion limit; after the mirror surface is subjected to a temperature difference of 20 ℃ to-60 ℃, the mirror surface shape (RMS) is 2.8nm.
In the technical scheme, the light metal reflector structure with the wide environment adaptation range provided by the invention has the following beneficial effects:
the light metal reflector with the wide environment adaptation range is simple in structure, the backboard is designed by combining high rigidity and high flexibility, deformation of the backboard and a mirror body mounting surface is greatly reduced, and high precision of a mirror surface is guaranteed;
the invention designs a three-way rod-shaped flexible structure which can realize radial and axial deformation simultaneously so as to eliminate installation and temperature stress and ensure good mechanical properties; the reflector has compact structure, light weight due to the adoption of light metal materials, and temperature adaptability and mechanical adaptability.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (7)
1. A lightweight metal mirror structure having a wide environmental adaptation range, the structure comprising:
the lens body (1) forms a disc body through a plurality of triangular structures, and a back plate connecting surface (101) is arranged on the lens body (1); and
the back plate (2) is supported at three points through the back plate connecting surface (101) and is connected to the mirror body (1), and the back plate (2) is formed by an internal rigid end and an external flexible end;
the structure further includes:
the lens body (1) and the back plate (2) are fixedly connected through the connecting part (3) and are positioned through the positioning pin (4).
2. The structure of the light metal reflector with the wide environmental adaptation range as claimed in claim 1, wherein a circular interface (102) is disposed in the middle of the reflector body (1), a first stress groove (103) is formed in the circular interface (102), and the circular interface (102) forms a three-point connection structure with the reflector surface of the reflector body (1) through the first stress groove (103);
the backboard connecting surface (101) is arranged in the middle of the first stress groove (103) and is provided with a second stress groove (104), and the joint of the second stress groove (104) and the backboard (2) is a coplanar three-small plane, so that the mirror body (1) and the backboard (2) are connected in a three-point mode.
3. A wide environmental adaptive light-weight metal reflector structure as recited in claim 2, wherein the three facets are each 0.002mm planar.
4. The structure of claim 2, wherein the connecting part (3) comprises three press blocks (301) arranged along the circumference of the circular ring-shaped interface (102), and the flatness of the press blocks (301) and the mounting surface of the mirror body (1) is 0.002mm; and
a fixing screw (302) matched with the pressing block (301), and a fixing structure is formed by the pressing block (301) and the fixing screw (302) so as to connect the mirror body (1) and the back plate (2);
briquetting (301) and locating pin (4) all adopt RSA6061 aluminium alloy material to make, just set screw (302) adopt 0Cr18Ni9 material to make.
5. A light-weight metal mirror structure with a wide environmental adaptation range according to claim 1, characterized in that the rigid end of the back plate (2) is configured as an inner layer (201), the flexible end of the back plate (2) is configured as three outer layers (202) which are uniformly distributed on the outer circumference of the inner layer (201);
one end of the back plate (2) far away from the mirror body (1) is configured as a mounting surface (203);
the outer layer (202) comprises two inclined first flexible rods (2021) which are symmetrically arranged with each other; and
a second flexible rod (2022) connected between the two first flexible rods (2021).
6. A light metal reflector structure with wide environmental adaptability according to claim 1, characterized in that the reflector body (1) and the back plate (2) are made of RSA6061 aluminum alloy material.
7. The structure of claim 5, wherein the first flexible rod (2021) and the second flexible rod (2022) have rectangular cross-section, 2mm width and 4mm height, and the angle between the adjacent first flexible rod (2021) and the second flexible rod (2022) is 120 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211163205.2A CN115437101A (en) | 2022-09-23 | 2022-09-23 | Light metal reflector structure with wide environmental adaptation range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211163205.2A CN115437101A (en) | 2022-09-23 | 2022-09-23 | Light metal reflector structure with wide environmental adaptation range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115437101A true CN115437101A (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211163205.2A Pending CN115437101A (en) | 2022-09-23 | 2022-09-23 | Light metal reflector structure with wide environmental adaptation range |
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| CN (1) | CN115437101A (en) |
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2022
- 2022-09-23 CN CN202211163205.2A patent/CN115437101A/en active Pending
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