Supporting device of metal reflector

Abstract

The utility model relates to the technical field of reflector supporting devices, in particular to a supporting device of a metal reflector, which is characterized in that an aluminum alloy reflector and a polytetrafluoroethylene pad are fixedly arranged in a reflector seat through a compression ring, and then the reflector seat is arranged on a fixed back plate; the fixing back plate is installed on the installation support assembly through the titanium alloy flexible supporting legs with the flexible grooves, the four micro knob assemblies are evenly arranged on the fixing back plate and the periphery of the mirror base, the aluminum alloy reflecting mirror is pushed to move relative to the fixing back plate through knobs, and therefore eccentric adjustment of the aluminum alloy reflecting mirror is achieved. Besides, except for the polytetrafluoroethylene pad and the flexible supporting legs, other structures of the supporting device are made of the same material as the aluminum alloy reflecting mirror, and mismatching of linear expansion coefficients is avoided. The flexible supporting legs can resist environmental vibration, the stability of the supporting device is improved, and the polytetrafluoroethylene pad can reduce the extrusion stress borne by the aluminum alloy reflecting mirror.

Description

Technical Field

[0001] The utility model relates to the technical field of reflector support devices, and specifically provides a support device for a metal reflector. Background Art

[0002] As a key optical component in an optical system, the surface accuracy and structural stability of the reflector have a significant impact on the imaging performance of the optical system. Silicon carbide (SiC) and glass-ceramic (Zerodur), commonly used materials for making high-precision reflectors, both have high specific stiffness and stable material properties. However, both have long processing cycles and high costs. In addition, the bonding and assembly process of SiC and glass-ceramic reflectors is complex, requiring indium steel nests and titanium alloy flexures that match their linear expansion coefficients. The nests and reflectors are then bonded together with epoxy adhesive to reduce thermal stress caused by ambient temperature fluctuations. In recent years, with the development and advancement of processing technology, some metal materials such as aluminum alloys and beryllium aluminum alloys have gradually become processing materials for reflectors.

[0003] As one of the main materials for reflectors, aluminum alloy has its own unique advantages. The material has good machinability and is easy to manufacture complex curved surfaces. The existing processing technologies, such as turning, milling, and grinding, can be used to quickly process the base structure of the reflector, so that the advantage of aluminum alloy material being easy to form can be fully utilized. The mirror surface of the reflector is then processed through a precise diamond cutting process to obtain a smooth plane that meets the imaging quality requirements of the wide-band optical system. At the same time, the mounting support structure of the optical system and the reflector body can be made of the same aluminum alloy material, avoiding the thermal stress and strain caused by the inconsistent linear expansion coefficients of the materials caused by the use of multiple materials in traditional optical-mechanical systems. This is of great significance to maintaining the long-term stability of the optical system performance. In addition, aluminum alloy materials perform excellently in the lightweight design of reflectors, and can be fully lightweighted. The support form can also be simplified to design an integrated optical-mechanical assembly structure.

[0004] Existing support devices usually include the following types: center support, side support, back support and peripheral support. Center support is a single-point support based on the center position of the reflector, which is suitable for supporting small-aperture reflectors; side support is usually used to support long strip reflectors; back support is a single-point or multi-point support on the back of the reflector, which needs to be used in conjunction with the back support plate, and the reflector should not be too thin; peripheral support is a support method that uses the bottom surface and the side surface of the reflector as a reference. This support method is connected to the reflector by pressing the flexible structure pressing sheet, which is easy to install and simple in design. Since the flexible structure has good contact with the side of the reflector and there is no gap, there is no assembly stress, and it protects the reflector, can improve the structural stability, and maintain the surface accuracy of the reflector.

[0005] The support structure of aluminum alloy reflectors is not mature. Most of the existing aluminum alloy reflector support structures directly adopt the same central support or back multi-point support as silicon carbide reflectors and microcrystalline glass reflectors. However, the central support structure cannot ensure the surface accuracy and is not suitable for supporting large-aperture reflectors. The back support requires the design of a back support plate, which results in a large mass and volume of the support component. A few aluminum alloy reflectors and their supporting structures are processed or cast together, and the structure is relatively complex and difficult to process. Utility Model Content

[0006] In order to solve the above problems, the utility model provides a support device for a metal reflector, in which an aluminum alloy reflector is mounted on a fixed back plate, and the eccentric position of the aluminum alloy reflector on the fixed back plate can be adjusted by a fine-tuning knob to achieve circumferential fixation of the aluminum alloy reflector. The support structure is simple and easy to implement, and the structures in contact with the aluminum alloy reflector are all made of aluminum alloy, avoiding thermal stress and strain problems caused by different materials.

[0007] The supporting device of the metal reflector provided by the utility model comprises:

[0008] A mounting bracket assembly, a reflector assembly, a plurality of miniature knob assemblies and a fixed back plate, wherein the mounting bracket assembly includes a plurality of flexible legs, and the fixed back plate is mounted on the mounting bracket assembly through the flexible legs;

[0009] The reflector assembly includes an aluminum alloy reflector, a mirror base, and a pressure ring; the aluminum alloy reflector is fixed in the mirror base through the pressure ring; the mirror base is connected to the fixed back plate;

[0010] The micro knob assembly includes a micro knob and a knob bracket. The micro knob includes a shell and a knob. The knob is rotatably connected inside the shell, and the shell is fixedly connected to the knob bracket. The knob bracket is connected to the fixed back plate, and multiple knob brackets are evenly distributed on the periphery of the mirror base. When the knob rotates, it moves closer to or away from the mirror base.

[0011] Preferably, the mounting bracket assembly further comprises a bracket riser, a bracket base plate and two reinforcing rods, wherein the bracket riser is vertically mounted on the bracket base plate; the two reinforcing rods are respectively located on both sides of the bracket riser, connecting the bracket riser and the bracket base plate.

[0012] Preferably, the number of the flexible legs is 3, and flexible grooves are provided on the legs; the 3 flexible legs are distributed in a triangular shape on one side of the vertical plate of the bracket.

[0013] Preferably, the number of micro knob assemblies is four.

[0014] Preferably, a side surface of the mirror base is provided with a regional plane for the knob to abut against, and the position of the plane corresponds to the position of the knob.

[0015] Preferably, an annular step is provided on the side surface of the aluminum alloy reflector, and the reflector assembly further includes a polytetrafluoroethylene pad placed on the annular step.

[0016] Preferably, the micro knob assembly further includes a knob pressing ring, which is connected to the housing.

[0017] Preferably, the mirror base, the pressure ring and the fixed back plate are all made of aluminum alloy.

[0018] Preferably, a plurality of mounting holes are provided on the bottom plate of the bracket.

[0019] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0020] The utility model mounts an aluminum alloy reflector on a fixed backplate via a mirror mount, and adjusts the position of the aluminum alloy reflector via a micro-knob assembly on the fixed backplate. This support device reduces the impact of the support device on the deformation accuracy of the aluminum alloy reflector. The support device has a simple structure, is lightweight, and is easy to process. It is applicable to aluminum alloy reflectors of various calibers, has a wide range of applications, and has few limitations. Furthermore, in the support device, the structures in contact with the aluminum alloy reflector are all manufactured using the same material as the aluminum alloy reflector, thus resolving the thermal stress and strain issues caused by different materials and linear expansion coefficients in traditional reflector support methods, thereby improving accuracy.

[0021] The support device of this utility model is provided with titanium alloy flexible legs, each of which is provided with a flexible groove, and a fixed back plate is mounted on the flexible legs. When subjected to environmental disturbances, the impact on the aluminum alloy reflector can be reduced, thereby improving the vibration resistance and stability of the support device, reducing the assembly stress caused by insufficient structural processing precision, and simultaneously reducing the extrusion stress of the support structure on the reflector when the temperature of the environment in which the reflector assembly is located changes, further improving the surface accuracy. At the same time, two reinforcing rods are provided on the mounting bracket assembly for mounting the aluminum alloy reflector, which can effectively increase the structural rigidity and reduce the structural rigid body displacement of the aluminum alloy reflector under the action of gravity.

[0022] The support device of the utility model is also provided with a plurality of mounting holes on the bracket base plate of the aluminum alloy reflector mounting bracket assembly, so that the aluminum alloy reflector can be installed on any existing multi-degree-of-freedom displacement platform for application as required, thereby improving the flexibility of the aluminum alloy reflector in application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a support device provided according to an embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of a mounting bracket assembly provided according to an embodiment of the present utility model;

[0025] Figure 3 1 is a schematic structural diagram of a reflector assembly provided according to an embodiment of the present utility model;

[0026] Figure 4 is a cross-sectional view of a reflector assembly provided according to an embodiment of the present utility model;

[0027] Figure 5 This is a schematic structural diagram of a micro knob assembly provided according to an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of a support device provided according to an embodiment of the present utility model being installed on a multi-degree-of-freedom translation platform;

[0029] Figure 7 This is another schematic diagram of the support device provided in an embodiment of the present utility model being installed on a multi-degree-of-freedom translation platform.

[0030] Reference numerals include:

[0031] Aluminum alloy reflector 11, mirror base 12, polytetrafluoroethylene pad 13, pressure ring 14, micro knob 21, housing 211, knob 212, knob bracket 22, knob pressure ring 23, fixed back plate 3, bracket base plate 41, bracket riser 42, reinforcing rod 43, flexible support leg 44, multi-degree-of-freedom translation platform 5. DETAILED DESCRIPTION

[0032] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, their detailed description will not be repeated.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0034] like Figure 1 As shown, the present invention provides a support device for a metal reflector, which is used for the installation and adjustment of ground optical machine products, including a mounting bracket assembly, a reflector assembly, a micro knob assembly and a fixed back plate 3. Figure 2As shown, the mounting bracket assembly includes a bracket base plate 41, bracket risers 42, reinforcement rods 43, and flexible legs 44. The bracket risers 42 are mounted to the bracket base plate 41 via six M6×20 hexagon socket head cap screws, with the bracket risers 42 and base plate 41 perpendicular to each other. Two reinforcement rods 43 are provided, one on each side of the bracket risers 42. Eight M4×16 hexagon socket head cap screws connect the bracket risers 42 and bracket base plate 41, forming a triangular structure. This connection improves the structural rigidity of the support device and reduces displacement of the structural rigid body due to gravity. Three flexible legs 44 are mounted on the side of the bracket risers 42 opposite the reinforcement rods 43, arranged in a triangular pattern. These legs are mounted to the bracket risers 42 via twelve M4×12 hexagon socket head cap screws. The flexible support leg 44 is made of titanium alloy and is provided with a flexible groove. When disturbed by the external environment, the flexible groove can absorb the disturbance, effectively reducing the impact of environmental vibration, improving the vibration resistance and stability of the support device, and reducing the assembly stress caused by insufficient structural processing accuracy. When the ambient temperature changes, the extrusion stress of the support structure on the reflector can be reduced.

[0035] The reflector assembly is mounted on the fixed back plate 3 via 6 M4×12 hexagon socket screws, and the fixed back plate 3 is mounted on the flexible legs 44 via 3 M6×20 hexagon socket screws. Figure 3 and Figure 4 As shown, the reflector assembly includes an aluminum alloy reflector 11, a mirror base 12, a polytetrafluoroethylene (PTFE) pad 13, and a pressure ring 14. The aluminum alloy reflector 11 is provided with an annular step on its outer circumference. The mirror base 12 is a hollow, flat cylinder. The outer diameter of the aluminum alloy reflector 11 matches the inner diameter of the mirror base 12. The aluminum alloy reflector 11 is embedded in the mirror base 12. Three polytetrafluoroethylene (PTFE) pads 13 are evenly spaced on the annular step of the aluminum alloy reflector. The pressure ring 14 is an annular structure and is fixed to the mirror base 12 via six M4×12 hexagon socket head cap screws. The pressure ring 14 covers the polytetrafluoroethylene (PTFE) pad 13 and the annular step of the aluminum alloy reflector 11, securing the aluminum alloy reflector 11 in the mirror base 12. This fixing method of the aluminum alloy reflector 11 can be understood as a circumferential support. The polytetrafluoroethylene (PTFE) pad 13 has a certain degree of elasticity, which can reduce the compressive stress on the aluminum alloy reflector 11.

[0036] A micro knob assembly is also mounted on the fixed back plate 3. The number of micro knob assemblies can be set according to the needs. In the embodiment of the present utility model, the number of micro knob assemblies is 4. Figure 5As shown, the micro knob assembly includes a micro knob 21, a knob bracket 22, and a knob pressure ring 23. Each of the four micro knob assemblies is connected to the fixed backplate 3 via its own knob bracket 22, evenly distributed around the periphery of the lens mount 12. Twelve M3×12 hexagon socket head cap screws are used at the connection points. Micro knob 21 includes a housing 211 and a knob 212. The housing 211 is fixedly connected to the knob bracket 22. The knob 212 is cylindrical and rotatably connected to the interior of the housing 211. Rotating the knob 212 causes axial displacement relative to the housing 211 and the knob bracket 22. The knob pressure ring 23 is connected to the housing 211 and secures the housing 211 to the knob bracket 22. The knob bracket 22 and knob pressure ring 23 can be thought of as two nuts, with the housing 211 being a screw. The three screw together to achieve a fixed connection. After installing the micro-knob assembly, its positional relationship with the mirror base 12 in the reflector assembly needs to be adjusted. The area on the mirror base 12 that contacts the knob 212 is machined into a flat surface. Rotate the knob 212 until the distance between its head and the corresponding flat surface on the mirror base 12 is within a range of 0.5±0.1mm, facilitating subsequent eccentricity adjustment of the aluminum alloy reflector 11. Rotate the knob 212 until it contacts the corresponding flat area on the mirror base 12. Continue to rotate the knob 212 to push the mirror base 12 toward or away from the mirror base 12.

[0037] To adjust the eccentricity of the aluminum alloy reflector 11, first loosen the six M4×12 hexagon socket screws between the reflector assembly and the fixed backplate 3. Then, rotate the corresponding knob 212 according to the direction and displacement of the aluminum alloy reflector 11. Once the knob 212 contacts the mirror mount 12, it pushes the mount 12, driving the aluminum alloy reflector 11 eccentrically. This achieves two-dimensional eccentricity adjustment of the metal reflector 11 within a plane perpendicular to the optical axis. The eccentricity adjustment accuracy has been verified to be better than 0.001 mm. After the eccentricity accuracy is adjusted, tighten the six M4×12 hexagon socket screws between the reflector assembly and the fixed backplate 3 to secure the reflector assembly.

[0038] When the ambient temperature of the supporting device changes, if the linear expansion coefficients of the supporting device and the supported device do not match, thermal stress may occur. To address this issue, the mirror base 12, pressure ring 14, and fixed back plate 3 of the embodiment of the utility model are all made of the same aluminum alloy as the aluminum alloy reflector 11. Alternatively, all other structures in the supporting device, except for the polytetrafluoroethylene pad 13 and the titanium alloy flexible legs 44, may be made of the same aluminum alloy as the aluminum alloy reflector 11 to make their linear expansion coefficients consistent and eliminate the effects of thermal stress.

[0039] like Figure 6 and Figure 7As shown, in order to make the metal reflector 11 suitable for the existing multi-degree-of-freedom translation stage 5, a plurality of mounting holes are further provided on the bracket base plate 41, through which the metal reflector 11 can be installed in different positions for application, further improving the flexibility of the metal reflector 11 in application.

[0040] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0041] The above specific embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A supporting device for a metal reflector, characterized in that: include: a mounting bracket assembly, a reflector assembly, a plurality of micro knob assemblies, and a fixed back plate, wherein the mounting bracket assembly includes a plurality of flexible legs, and the fixed back plate is mounted on the mounting bracket assembly via the flexible legs; The reflector assembly comprises an aluminum alloy reflector, a mirror seat, and a pressure ring; the aluminum alloy reflector is fixed in the mirror seat by the pressure ring; the mirror seat is connected to the fixed back plate; The micro knob assembly includes a micro knob and a knob bracket. The micro knob includes a shell and a knob. The knob is rotatably connected within the shell, and the shell is fixedly connected to the knob bracket. The knob bracket is connected to the fixed backplate, and multiple knob brackets are evenly distributed on the periphery of the mirror base. When the knob rotates, it moves closer to or away from the mirror base.

2. The supporting device for a metal reflector according to claim 1, wherein: The mounting bracket assembly also includes a bracket riser, a bracket base and two reinforcing rods. The bracket riser is vertically mounted on the bracket base; the two reinforcing rods are respectively located on both sides of the bracket riser, connecting the bracket riser and the bracket base.

3. The supporting device for the metal reflector according to claim 2, wherein: The number of the flexible legs is 3, and flexible grooves are provided on the legs; the 3 flexible legs are distributed in a triangular shape on one side of the vertical plate of the bracket.

4. The supporting device for a metal reflector according to claim 1, wherein: The number of the micro knob assemblies is 4.

5. The supporting device for a metal reflector according to claim 1, wherein: A plane area for the knob to abut is provided on the side surface of the mirror base, and the position of the plane area corresponds to the position of the knob.

6. The supporting device for a metal reflector according to claim 1, wherein: An annular step is provided on the side surface of the aluminum alloy reflector, and the reflector assembly further comprises a polytetrafluoroethylene pad placed on the annular step.

7. The supporting device for a metal reflector according to claim 1, wherein: The micro knob assembly further includes a knob pressing ring, which is connected to the housing.

8. The supporting device for a metal reflector according to claim 1, wherein: The mirror base, pressure ring and fixed back plate are all made of aluminum alloy.

9. The supporting device for a metal reflector according to claim 2, wherein: A plurality of mounting holes are provided on the bracket bottom plate.

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