A vibration-resistant and heat-dissipating support mechanism for a rectangular reflector with a large aspect ratio

Abstract

This invention discloses a vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular mirror of an astronomical spectroscopic imager, relating to the field of astronomical optical instrument design and manufacturing. It is applicable to situations where the mirror assembly mounting bracket and the mirror assembly materials are mismatched, providing vibration-resistant and heat-dissipating support for the mirror. The mechanism includes: a mirror chamber assembly, a vibration-isolated and heat-dissipating rigid support structure, and a vibration-isolated and heat-dissipating flexible structure. It can maintain the mirror surface accuracy even under external random vibration interference and temperature changes, ensuring that the mirror mounting bracket and mirror assembly, using materials with different coefficients of thermal expansion, maintain the mirror surface accuracy. Its key features are: the mirror support structure uses optical adhesive to prevent direct contact between the mirror chamber and the mirror, providing thermal expansion margin for both; the mirror chamber support structure includes a bottom rigid support portion and an upper flexible structure, working together to achieve positioning and vibration-resistant and heat-dissipating support. This invention features a simple support structure, good support stability, and no additional force on the mirror surface, effectively meeting engineering needs.

Description

Technical Field

[0001] This invention belongs to the field of mechanical design and manufacturing technology, specifically relating to a vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector in an astronomical optical instrument; the reflector is an important part of an astronomical instrument, and its positional accuracy directly affects the final imaging effect, therefore a vibration-resistant and heat-dissipating reflector support mechanism is essential. Background Technology

[0002] Reflectors are crucial components in astronomical optical instruments, significantly impacting their imaging performance. Rectangular reflectors are commonly used in collimating mirrors for spectrometers, secondary mirrors for optical telescopes, and other specialized optical systems such as off-axis three-mirror systems. To meet the optical requirements of reflectors, the choice of materials is limited, often resulting in a mismatch in the coefficients of thermal expansion between the reflector material and the supporting components and structure. This leads to thermal stress generated between components during temperature changes, ultimately transferring to the reflector surface and damaging its shape. Furthermore, external vibrations are unavoidable during reflector operation. Ensuring the reflector's imaging capability requires guaranteeing its surface accuracy, positional and attitude stability, necessitating sufficient static stiffness and good vibration isolation in the supporting structure. Especially for rectangular mirrors with a large aspect ratio, they are more sensitive to temperature and vibration, posing a greater challenge to the design of the support structure. At the same time, the testing, installation, positioning, and adjustment of the mirror require that the support structure not be too complex. Therefore, a support structure that is simple in structure, easy to install and adjust, can eliminate thermal mismatch between the mirror assembly and the mirror bracket when the temperature changes, and can ensure the performance of the mirror under external random vibration interference conditions, can be used to achieve high-quality imaging of the reflective optomechanical system. Summary of the Invention

[0003] This invention provides a vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector. It reduces thermal mismatch caused by differences in the thermal expansion coefficients of the reflector, mirror chamber frame, and reflector back plate, minimizing the impact of external random vibration interference and temperature changes on the mirror surface shape, thus achieving stable support for the large aspect ratio rectangular reflector. The support structure of this invention is simple, provides good stability, and requires no additional force on the mirror surface, effectively meeting engineering requirements.

[0004] This invention achieves the above objectives through the following technical solution: a vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector, mounted on an optical instrument mounting bracket, to achieve high-precision surface support for the reflector. This mechanism consists of a mirror chamber frame, a reflector, a backplate, a rigid support structure for the mirror chamber frame, and a flexible support structure for the mirror chamber frame.

[0005] The main body of the mirror chamber frame is a long rectangular frame structure with four sides: the top and bottom surfaces and the left and right sides. The front of the mirror chamber frame is provided with a flange end face, which is matched with the positioning of the reflector. The back of the mirror chamber frame has recessed surfaces symmetrically provided at certain intervals along the edge of the frame.

[0006] The reflector has a convex cross-section, with a spherical back and flat surfaces on the other sides; the upper and lower edges of the spherical surface are machined into flat end faces. The reflector is installed in the mirror chamber frame, with the front end face of the reflector directly positioned and fitted with the flange end face; one end of the pressure block is installed in the recessed surface and fixed with screws, while the other end of the pressure block presses against the flat end face of the (or lower) edge of the reflector's spherical surface and is fixedly connected to the flat end face by applying adhesive.

[0007] The back plate has a long rectangular through hole in the middle, which is large enough to accommodate the spherical surface of the reflector; there are two long steps at the top and bottom ends; and threaded holes for installation.

[0008] The rigid support structure of the endoscope chamber frame includes: a T-shaped support structure and a central positioning support structure.

[0009] The central positioning support structure is located in the middle of the bottom surface of the mirror chamber frame, and T-shaped support structures are symmetrically distributed on both sides at certain intervals, with two on each side, for a total of four T-shaped support structures.

[0010] The central positioning support structure includes: a central positioning transition block and a central positioning support.

[0011] The T-shaped support structure includes: linear guide rail, slider, and T-shaped support component.

[0012] The flexible support structure of the endoscope chamber frame consists of two parts: a fixed flexible structure and a sliding flexible structure.

[0013] The sliding flexible structure includes: linear guide rail, slider, flexible rod mounting plate, flexible rod, and flexible rod support.

[0014] The fixed flexible structure includes: a flexible rod, a base for the intermediate flexible rod, and a support for the intermediate flexible rod.

[0015] The mirror support structure reduces thermal stress caused by temperature changes between the mirror chamber frame and the mirror body due to temperature variations through the deformation of the adhesive layer distributed within the mirror chamber frame. It also resists vibration interference. The rigid support structure at the bottom of the mirror chamber frame support structure ensures the positional stability of the mirror body, while the linear guide rails release thermal stress in the guide rail direction caused by temperature changes in the mirror chamber frame and back plate made of different materials. The flexible support structure above the mirror chamber frame support structure absorbs random vibration energy in the direction of gravity through flexible links, thereby reducing the impact of random vibration on the mirror chamber. It also reduces thermal stress caused by thermal deformation differences due to thermal mismatch between the back plate and the mirror chamber frame in the direction of gravity. The flexible link is a variable cross-section beam structure; by controlling the cross-section size, the stiffness can be controlled to ensure the required support stiffness while possessing a certain degree of flexibility. Vibration and thermal stress are absorbed through the deformation of the flexible joint. Finally, by constraining the dimensions of the guide rails and supports perpendicular to the mirror surface, the supports undergo equal thermal deformation in the direction perpendicular to the mirror surface under the same temperature change, preventing the thermal stress torque generated by uneven thermal deformation from being transmitted to the mirror's failure surface.

[0016] The rectangular reflector with a large aspect ratio is made of low-thermal-expansion microcrystalline glass, which is minimally affected by temperature changes. The reflector is in direct contact with the flange end face, and the mirror chamber frame is made of Invar steel, which has a low coefficient of thermal expansion and is insensitive to temperature changes. The flange needs to reach a high-precision grinding level to ensure the fit accuracy. The other four sides of the reflector are not in direct contact with the mirror chamber frame; a 0.5mm thick optical adhesive spot is distributed between the reflector and the four sides of the mirror chamber frame. Twelve pressure blocks span between the flat end faces of the two sides of the reflector spherical surface and the recessed surface of the mirror chamber frame. The pressure blocks are fastened to the recessed surface with bolts, and there is a 0.5mm optical adhesive spot between the pressure blocks and the reflector, without direct contact with the mirror chamber. The optical adhesive spot uses an optical adhesive with a low elastic modulus and a high coefficient of thermal expansion, such as 704 optical adhesive. Under no temperature change, it can ensure the stability of the static position and attitude accuracy of the reflector. Under temperature changes, the deformation of the adhesive spot provides a certain thermal expansion margin between the reflector and the mirror chamber, so that the two do not generate direct thermal stress.

[0017] The central positioning support primarily serves for positioning and support. It is made of the same Invar steel as the mirror chamber frame, ensuring no thermal stress between it and the frame during temperature changes. The upper end is bolted to the mirror chamber frame, and the lower end is fixed to the central positioning transition block. The central positioning hole serves for installation and positioning. The four sets of linear guides are typically made of bearing steel, with two sets symmetrically distributed on each side of the back plate. Each slider is equipped with a T-shaped support, also made of the same Invar steel as the mirror chamber frame, ensuring no thermal stress between it and the frame during temperature changes. The T-shaped support is bolted to the mirror chamber frame, providing rigid support. The linear guides allow the mirror chamber to expand freely in the sliding direction during temperature changes and allow for the release of lateral vibration stress during external random vibration disturbances. The center positioning transition block is installed on the back plate, serving as a transition and size adjustment between the back plate and the center positioning support. It does not contact the mirror chamber and should be made of the same material as the linear guide rail. Its thickness in the direction perpendicular to the mirror surface is the same as that of the linear guide rail in the same direction. Under temperature changes, it generates the same amount of thermal strain as the linear guide rail. Therefore, the bottom rigid support part of the mirror chamber support structure does not generate thermal stress torque in the direction perpendicular to the mirror surface.

[0018] The flexible rod is a variable cross-section beam structure that absorbs energy and resists external vibration interference and thermal deformation through the deformation of the small cross-section joint. Compared with traditional hinges, it is frictionless and has high precision. Six flexible rods are symmetrically distributed on the left and right sides of the mirror chamber frame's symmetry plane, with two in the middle and two on each side. The base of the middle flexible rod is symmetrically machined with threaded holes for connection to the flexible rod, directly mounted on the back plate and secured with bolts. The supports for the middle and left / right flexible rods are directly mounted on the mirror chamber frame and symmetrically machined with through holes, where nuts are used to clamp the flexible rod. One end of the left and right flexible rods is fixed to the flexible rod support with nuts, and the other end is mounted on the flexible rod mounting plate. The flexible rod mounting plate is fixed to the slider of the linear guide rail, serving as a transition and size adjustment function. Under temperature changes and external lateral vibration interference, when the mirror chamber frame undergoes lateral expansion displacement, the sliding flexible structure can move laterally on the guide rail with the slider, coordinating with the bottom rigid support part, without generating lateral internal stress. The flexible rod serves as a structural material boundary. All supports in direct contact with the mirror chamber frame are made of the same material as the mirror chamber, such as Invar steel. The flexible rod and all parts on the other side of the rod are made of the same material, such as bearing steel. Simultaneously, the sum of the thicknesses of the linear guide rail and the flexible rod mounting plate in the direction perpendicular to the mirror surface is equal to the thickness of the intermediate flexible rod base in that direction. During temperature changes, the flexible portion above the entire mirror chamber support structure experiences uniform thermal expansion in the direction perpendicular to the mirror surface, thus preventing thermal stress torque from being generated in this direction. In the direction of gravity, random vibration loads and thermal stress caused by thermal mismatch between the back plate and the mirror chamber frame are absorbed and reduced through the deformation of the flexible joint, minimizing the impact on the reflector.

[0019] Beneficial effects

[0020] This invention can eliminate thermal mismatch between the reflector assembly and the reflector bracket due to differences in the coefficients of thermal expansion of the materials, reduce the impact of external random vibration interference and temperature changes on the mirror surface shape, achieve stable support for rectangular reflectors with large aspect ratios, have a simple support structure, good support stability, and no additional force on the mirror surface, and can well meet the needs of engineering. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 A schematic diagram of the front structure of the mirror chamber frame;

[0023] Figure 2 Schematic diagram of the rear structure of the mirror chamber frame;

[0024] Figure 3 Schematic diagram of the reflector body structure;

[0025] Figure 4 A schematic diagram of the back of the mirror after it has been installed in the mirror chamber frame;

[0026] Figure 5 A three-dimensional structural diagram of the mirror chamber frame;

[0027] Figure 6 Schematic diagram of the rigid support structure of the endoscope chamber frame;

[0028] Figure 7 Schematic diagram of the connection structure between the rigid support structure and the back panel of the endoscope chamber frame;

[0029] Figure 8 Schematic diagram of the T-shaped support component;

[0030] Figure 9 Schematic diagram of the installation structure of the T-shaped support component;

[0031] Figure 10 Schematic diagram of the connection structure between the flexible support structure and the back panel of the endoscope chamber frame;

[0032] Figure 11 Schematic diagram of a sliding flexible structure;

[0033] Figure 12 Schematic diagram of a fixed flexible structure;

[0034] Figure 13 Schematic diagram of the back panel structure;

[0035] Figure 14 Schematic diagram of the glue injection holes in the mirror chamber frame and the optical glue spots on the reflector.

[0036] The components are: 1. Mirror chamber frame, 2. Flange end face, 3. Hanging lug, 4. Recessed surface, 5. Rectangular shallow groove, 6. Mounting end face, 7. Reflector, 8. Pressure block, 9. Linear guide rail, 10. Slider, 11. T-shaped support, 12. Center positioning transition block, 13. Center positioning support, 14. Back plate, 15. Long strip step, 16. Flexible rod mounting plate, 17. Flexible rod, 18. Flexible rod support, 19. Intermediate flexible rod base, 20. Intermediate flexible rod support, 21. Nut, 22. Glue injection hole, 23. Optical glue spot. Detailed Implementation

[0037] This invention discloses a vibration-resistant and heat-dissipating support device for a large aspect ratio rectangular reflector, comprising: a mirror chamber frame 1, a reflector 7, a back plate 14, a rigid support structure for the mirror chamber frame, and a flexible support structure for the mirror chamber frame. See details below. Figures 1-13 As shown.

[0038] Mirror chamber frame 1 Figure 1 and Figure 2 As shown, the main body has a long rectangular frame structure with four surfaces: the top and bottom surfaces and the left and right sides. The front of the mirror chamber frame 1 has a flange end face 2, which positions and mates with the reflector 7. The back of the mirror chamber frame 1 has symmetrically spaced recessed surfaces 4 along the frame edge, six on the top and six on the bottom. Each recessed surface 4 has a threaded hole that mates with a pressure block 8. The upper ends of the back of the mirror chamber frame 1 have lugs 3; these lugs are for installing lifting rings during assembly because the reflector is very heavy.

[0039] The upper bottom surface of the endoscope frame 1 is provided with a rectangular shallow groove 5 and a mounting end face 6; these are used to accommodate the installation of the flexible support structure of the endoscope frame. Both the mounting end face 6 and the recessed surface 4 are provided with threaded holes. The lower bottom surface of the endoscope frame 1 is provided with threaded holes for accommodating the installation of the rigid support structure of the endoscope frame, such as... Figure 5 As shown.

[0040] The reflector 7 has a convex cross-section (for easy installation and fixation of the pressure block 8 within the mirror chamber frame 1). The back of the reflector 7 is spherical, while the other surfaces are flat. The upper and lower edges of the spherical surface are machined into flat end faces (for adhesive mating with the pressure block 8). The reflector 7 is installed into the mirror chamber frame 1, with the front end face of the reflector 7 directly positioned and mated to the flange end face 2; as... Figure 4 As shown, one end of the pressure block 8 is installed in the sunken surface 4 and fixed with screws, and the other end of the pressure block 8 presses against the flat end face of the spherical surface (or lower edge) of the reflector 7 and is fixedly connected to the flat end face by applying adhesive.

[0041] Back panel 14 Figure 13 As shown, there is a long rectangular through hole in the middle, large enough to expose the spherical surface of the reflector; two long steps 15 are provided at both the top and bottom ends; and threaded holes are provided for installation. Figure 7 , Figure 10and Figure 13 As shown. The reflector 7 is installed in the mirror chamber frame 1, and the back plate 14 is installed on the rear side of the mirror chamber frame 1.

[0042] The rigid support structure of the endoscope chamber frame includes: a T-shaped support structure and a centrally positioned support structure. For example... Figure 6 , Figure 7 As shown, the central positioning support structure is located in the middle of the bottom surface of the mirror chamber frame 1, and T-shaped support structures are symmetrically distributed on both sides at certain intervals, with two on each side, for a total of four T-shaped support structures.

[0043] The central positioning support structure includes: a central positioning transition block 12 and a central positioning support 13.

[0044] The upper end face of the center positioning support 13 has countersunk through holes symmetrically distributed on both sides, which are installed and fitted with threaded holes on the bottom surface of the mirror chamber frame 1 and fixed by screws. The rear end face has a precision-machined through positioning hole located at the center of the axis of symmetry and symmetrically distributed through holes on both sides; the center positioning transition block 12 has a precision-machined positioning mating hole coaxial with the positioning hole of the center positioning support 13 and symmetrically distributed threaded holes on both sides; the center positioning support 13 and the center positioning transition block 12 are fixed to the back plate 14 together by screws.

[0045] The T-shaped support structure includes: a linear guide rail 9, a slider 10, and a T-shaped support member 11. The upper surface of the T-shaped support member 11 has symmetrically distributed countersunk through holes, which mate with threaded holes on the lower surface of the mirror chamber frame 1 for bolt installation and fastening. The rear end face of the T-shaped support member 11 has symmetrically distributed through holes, which are bolted to the slider 10. The slider 10 is fixed to the rear end face of the T-shaped support member 11 and mounted on the linear guide rail 9. The T-shaped support member 11 and the slider 10 can move together along the linear guide rail 9. The edge of the linear guide rail 9 rests on a long step 15 at the lower end of the back plate 14, providing support for the linear guide rail 9. Both ends of the linear guide rail 9 have threaded holes for screw fixing to the back plate 14. Figure 9 As shown. The T-shaped support 11 has reinforcing ribs on its symmetrical plane, making the T-shaped support 11 generally T-shaped. Figure 8 As shown. In the direction perpendicular to the mirror surface, the thickness of the linear guide 9 and the thickness of the center positioning transition block 12 must be equal, and the thickness of the T-shaped support 11 and the thickness of the center positioning support 13 must be equal; the materials of the center positioning support 13 and the T-shaped support 11 are both Invar steel, the same as those of the mirror chamber frame 1; the linear guide 9, the slider 10 and the center positioning transition block 12 are made of the same material.

[0046] The flexible support structure of the endoscope chamber frame consists of two parts: a fixed flexible structure and a sliding flexible structure. For example... Figure 10-12As shown. The fixed flexible structure is located in the middle part of the upper end face of the mirror chamber frame 1, and the sliding flexible structure consists of two structures symmetrically arranged on both sides of the fixed flexible structure.

[0047] The sliding flexible structure includes: a linear guide rail 9, a slider 10, a flexible rod mounting plate 16, a flexible rod 17, and a flexible rod support 18. The flexible rod mounting plate 16 is fixedly connected to the slider 10, which is mounted on the linear guide rail 9. The edge of the linear guide rail 9 rests on a long step 15 at the upper end of the back plate 14, providing support for the linear guide rail 9. The linear guide rail 9 has threaded holes at both ends, which are then fixed to the back plate 14 with screws. A mounting end face 6 is provided on the upper surface of the mirror chamber frame 1 at a symmetrical position relative to the flexible rod mounting plate 16, and the flexible rod support 18 is fixed to the mounting end face 6. One end of the flexible rod 17 is fixedly mounted on the flexible rod mounting plate 16, and the other end is clamped and secured to the flexible rod support 18 by two nuts 21. Two flexible rods 17 are mounted on the flexible rod mounting plate 16.

[0048] The fixed flexible structure includes: a flexible rod 17, a base 19 for the intermediate flexible rod, and a support 20 for the intermediate flexible rod.

[0049] The intermediate flexible rod base 19 is fixed at the middle position of the upper end of the back plate 14, corresponding to the rectangular shallow groove 5 on the upper end face of the mirror chamber frame 1. The intermediate flexible rod support 20 is fixed on the mounting end face 6 directly opposite the rectangular shallow groove 5. One end of the flexible rod 17 is fixedly installed on the intermediate flexible rod base 19, and the other end is clamped and fastened to the intermediate flexible rod support 20 by two nuts 21.

[0050] The flexible rod 17 is a variable cross-section beam structure, characterized in that, under the premise of sufficient static stiffness, it can absorb vibration energy and reduce the impact of vibration on the other end by deforming its own flexible links when subjected to external vibration excitation. The flexible rod support 18 and the intermediate flexible rod support 20 are made of the same material as the mirror chamber frame 1. The linear guide 9, slider 10, flexible rod mounting plate 16, and intermediate flexible rod base 19 are made of the same material, and the sum of the thicknesses of the linear guide 9, slider 10, and flexible rod mounting plate 16 in the direction perpendicular to the mirror surface is equal to the thickness of the intermediate flexible rod base 19 in that direction. The same materials have the same coefficient of thermal expansion, and the magnitude of thermal expansion in the direction perpendicular to the back plate is proportional to the size of the parts in that direction under the same ambient temperature. Therefore, the sum of the dimensions of the linear guide 9, slider 10, and flexible rod mounting plate 16 in that direction is equal to the dimension of the intermediate flexible rod base 19 in that direction, so that the overall expansion of the sliding flexible structure and the overall expansion of the fixed flexible structure in the direction perpendicular to the back plate is the same under the same ambient temperature, and no thermal stress torque is generated in the mirror chamber frame 1.

[0051] During installation: The upper and lower side walls of the mirror chamber frame 1 are machined with mating surfaces, threaded holes, and glue injection holes 22 for connection with the rigid support structure and the flexible structure, which are symmetrically distributed. Figure 14 As shown; the left and right side walls of the mirror chamber frame 1 are machined with symmetrically distributed threaded holes and glue injection holes; the glue injection holes are used to inject optical glue spots after the reflector 7 is installed into the mirror chamber, and the specific distribution of the optical glue spots is shown in the figure. Figure 14 The threaded holes are used for connecting components such as supports; the other surfaces of the reflector 7 are flat, and the four side planes are bonded to the mirror chamber frame 1 with optical adhesive spots of a certain thickness. The front is directly positioned and fitted with the flange end face 2 of the mirror chamber frame 1; the mirror chamber frame 1 and the pressure block 8 are made of the same material, so they do not generate interaction forces during thermal expansion. The optical adhesive spot 23 is made of 704 optical adhesive. During the installation of the reflector 7 into the mirror chamber frame 1, feeler gauges are used to ensure that the spacing of the four sides is 0.5mm and that there is no gap between the reflector 7 and the flange contact surface. After installation, ball head bolts are used to help support and position the reflector 7 before the optical adhesive spot is injected.

[0052] After the optical adhesive spot cures, the mirror assembly experiences slight tensile stress from the curing shrinkage of the adhesive layer, which has little impact on the mirror surface shape. Apart from this, it is not subjected to any additional stress and is only affected by gravity under static conditions. The Invar steel used in the mirror chamber frame 1 has a similar coefficient of thermal expansion to the microcrystalline glass used in the mirror 7. Furthermore, the optical adhesive spot used has a large radial coefficient of thermal expansion and a small elastic modulus. Therefore, the mirror has a large thermal expansion margin, and the mirror surface experiences significant attenuation due to vibration.

[0053] A schematic diagram of the overall vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector is shown below. Figure 10 The vibration isolation and heat dissipation rigid support structure mainly serves as rigid support and positioning. The middle top block and the linear guide rail assembly have the same thickness constraint in the direction perpendicular to the mirror surface. The middle flexible rod support, the linear guide rail, and the slider pressure plate assembly have the same thickness constraint in the direction perpendicular to the mirror surface. The thermal expansion stress in the direction perpendicular to the mirror surface of the mirror chamber is uniform and there is no stress moment. The thermal expansion stress in the length direction of the mirror chamber and the internal stress caused by vibration interference in this direction are released by the free displacement of the six sets of guide rail sliders, and there is no stress in this direction. The thermal expansion stress in the gravity direction and the internal stress caused by vibration interference in this direction are attenuated by the flexible deformation of the flexible link, and the impact is small.

[0054] Because the operating environment temperature of the reflector is relatively high, reaching up to about 70 degrees Celsius, the thermal expansion of the reflector will affect the surface shape of the mirror. Therefore, heat dissipation treatment is necessary, mainly through the following two aspects: First, the adhesive layer on the reflector allows the reflector to have a certain thermal expansion space in the mirror chamber, preventing excessive thermal stress and providing some vibration damping. Second, the materials of the reflector back plate and the mirror chamber frame generally have a large difference in thermal expansion coefficient, which may generate significant thermal stress and transfer it to the reflector. The solution is to use transverse guide rails to allow the mirror chamber frame to expand freely in the lateral direction relative to the back plate. In addition to vibration reduction, the flexible structure also allows the mirror chamber frame to have a certain longitudinal expansion space relative to the back plate.

[0055] The present invention is not limited to the specific technical solutions described in the above embodiments. All technical solutions formed by equivalent substitutions are within the scope of protection claimed by the present invention.

Claims

1. A vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector, characterized in that, It includes a mirror chamber frame, a reflector, a back plate, a rigid support structure for the mirror chamber frame, and a flexible support structure for the mirror chamber frame; the front of the mirror chamber frame is provided with a flange end face, and the back plate is installed on the rear side of the mirror chamber frame; the rigid support structure for the mirror chamber frame is installed on the bottom surface of the mirror chamber frame; and the flexible support structure for the mirror chamber frame is installed on the top surface of the mirror chamber frame. The reflector is in direct contact with the flange end face. The mirror chamber frame is made of Invar steel. The other four sides of the reflector are not in direct contact with the mirror chamber frame. A 0.5mm thick optical adhesive spot is distributed between the reflector and the four sides of the mirror chamber frame. The rigid support structure of the endoscope chamber frame includes a T-shaped support structure and a central positioning support structure. The central positioning support structure is located in the middle of the bottom surface of the endoscope chamber frame, with T-shaped support structures symmetrically distributed on both sides. The central positioning support structure includes a central positioning transition block and a central positioning support. The T-shaped support structure includes a first linear guide rail, a first slider, and a T-shaped support member. The first slider is fixed to the rear end face of the T-shaped support member and is mounted on the first linear guide rail. The edge of the first linear guide rail rests on a long step at the lower end of the back plate and is fixed to the back plate. In the direction perpendicular to the mirror surface, the thickness of the first linear guide rail is equal to the thickness of the central positioning transition block, and the thickness of the T-shaped support member is equal to the thickness of the central positioning support. The central positioning support and the T-shaped support member are both made of the same Invar steel material as the endoscope chamber frame. The first linear guide rail, the first slider, and the central positioning transition block are made of the same material. The flexible support structure of the endoscope chamber frame consists of two parts: a fixed flexible structure and a sliding flexible structure. The fixed flexible structure is located in the middle part of the upper end face of the endoscope chamber frame; the sliding flexible structure is symmetrically located on both sides of the fixed flexible structure. The sliding flexible structure includes a second linear guide rail, a second slider, a flexible rod mounting plate, a first flexible rod, and a flexible rod support. The flexible rod mounting plate is fixedly connected to the second slider, the second slider is mounted on the second linear guide rail, the edge of the second linear guide rail rests on a long step at the upper end of the back plate, and the second linear guide rail is fixed to the back plate. An mounting end face is provided on the upper end face of the mirror chamber frame opposite to the flexible rod mounting plate, and the flexible rod support is fixed to the mounting end face. One end of the first flexible rod is fixedly mounted on the flexible rod mounting plate, and the other end is fastened to the flexible rod support. The fixed flexible structure includes a second flexible rod, a middle flexible rod base, and a middle flexible rod support; the middle flexible rod base is fixed at the middle position of the upper end of the back plate, corresponding to the rectangular shallow groove on the upper end face of the mirror chamber frame; the middle flexible rod support is fixed on the mounting end face directly opposite the rectangular shallow groove; one end of the second flexible rod is fixedly installed on the middle flexible rod base, and the other end is fastened to the middle flexible rod support. The sum of the thicknesses of the second linear guide, the second slider, and the flexible rod mounting plate in the direction perpendicular to the mirror surface is equal to the thickness of the intermediate flexible rod base in that direction; the flexible rod support and the intermediate flexible rod support are made of the same Invar steel material as the mirror chamber frame; the second linear guide, the second slider, the flexible rod mounting plate, and the intermediate flexible rod base are made of other identical materials.

2. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 1, characterized in that, The main body of the endoscope frame is a long rectangular frame structure with four sides: the top and bottom surfaces and the left and right sides. The back of the endoscope frame has recessed surfaces symmetrically arranged at certain intervals along the edge of the frame, and each recessed surface has a threaded hole that engages with a pressure block.

3. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 2, characterized in that, Threaded holes are provided on the mounting end face and the recessed surface of the upper bottom surface of the mirror chamber frame; threaded holes are provided on the lower bottom surface of the mirror chamber frame for installation with the rigid support structure of the mirror chamber frame.

4. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 1, characterized in that, The reflector has a convex cross-section, with a spherical back surface and flat surfaces on the other sides. The upper and lower edges of the spherical surface are machined into flat end faces. The reflector is installed in the mirror chamber frame, with the front end face of the reflector directly positioned and fitted with the flange end face. One end of the pressure block is installed in the recessed surface and fixed with screws, while the other end of the pressure block presses against the flat end face of the spherical edge of the reflector and is fixedly connected to the flat end face by applying adhesive.

5. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 1, characterized in that, The back plate has a long rectangular through hole in the middle, and two long steps at the top and bottom ends; and threaded holes for installation.

6. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 1, characterized in that, The upper end face of the center positioning support has countersunk through holes symmetrically distributed on both sides, which are installed and fitted with the threaded holes on the bottom surface of the mirror chamber frame and fixed by screws; the rear end face has a precision-machined through positioning hole located at the center of the axis of symmetry and through holes symmetrically distributed on both sides; the center positioning transition block has a precision-machined positioning mating hole coaxial with the positioning hole of the center positioning support and threaded holes symmetrically distributed on both sides; the center positioning support is fixed to the back plate together with screws and the center positioning transition block.

7. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 1, characterized in that, The upper end face of the T-shaped support has countersunk through holes symmetrically distributed on the left and right, which are bolted to the threaded holes on the bottom surface of the mirror chamber frame; the rear end face of the T-shaped support has through holes symmetrically distributed on the left and right, which are bolted to the first slider; the two ends of the first linear guide rail have threaded holes and are fixed to the back plate with screws; the T-shaped support has reinforcing ribs on its symmetrical surfaces.

8. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 1, characterized in that, The other end of the first flexible rod is clamped and fastened to the flexible rod support by two nuts; there are two first flexible rods installed on the flexible rod mounting plate.

9. The vibration-resistant and heat-dissipating support mechanism for a large aspect ratio rectangular reflector according to claim 1, characterized in that, The other end of the second flexible rod is clamped and secured to the support of the middle flexible rod by two nuts.

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