Flexible supporting structure of reflecting mirror

Abstract

The invention discloses a reflecting mirror flexible supporting structure, which comprises a reflecting mirror and a flexible flange, the back circumference of the reflecting mirror is glued with the inner wall of the inner ring of the flexible flange, and the flexible flange is provided with at least one flexible unit to form a supporting structure; the outer ring of the flexible flange is connected with the back plate through a bolt, and the back plate and the reflector are connected with the main optical system through a plurality of screws. According to the flexible supporting structure of the reflector, the design difficulty of the reflector assembly and the engineering implementation difficulty are simplified, the processing performance of the reflector assembly is improved, and the installation and adjustment difficulty of the whole machine is reduced. Meanwhile, due to simple processing and assembling, the production cost is reduced, and the device is suitable for large-scale production; and moreover, the adaptability of the assembly to external interference is improved, the influence of roughness and unevenness of the mounting surface on the surface type precision of the reflecting mirror can be reduced, and the tolerance capability of the system can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of space optical remote sensing, and in particular to a flexible supporting structure of a reflector. Background Art

[0002] With the rapid development of optical technology, optical systems are being used in more and more fields. As an important component of the optical system, the requirements for reflectors are becoming higher and higher. Usually, the position error needs to meet the tolerance requirements of several microns or several arc seconds, and the surface shape error of the optical lens usually needs to be guaranteed to be within a few or even tens of the wavelength of visible light. Compared with the ground-based and space optical system design, the aeronautical optical imaging system is more demanding and has distinct characteristics and difficulties. When designing the structure, on the one hand, it is subject to strong constraints of volume and weight; on the other hand, it needs to have good environmental adaptability and be able to withstand a wide range of temperature changes (-40℃-50℃), different degrees of impact, vibration, air pressure and mechanical environment in different directions. Therefore, as the connection channel between the reflector and the main structure of the camera, the flexible joint can effectively eliminate the influence of the above environment through its own deformation, which is a key technology for designing the reflector assembly.

[0003] At present, the support methods of reflectors mainly include peripheral support, side support, center support and back support. Among them, peripheral support is mostly suitable for small-sized reflectors. The surface or edge of the lens is used as the reference, and the lens is fixed to the frame or mirror seat by a pressure ring to achieve system positioning; side support is based on the side of the reflector for positioning, and the reflector is connected to the system by screw connection or gluing. It is a more common way to fix the reflector; center support is usually widely used in small and medium-sized reflectors, and is mostly used in optical systems with center holes. It is a support method that uses the center position of the reflector as a positioning reference. The support structure and the center hole of the reflector are fixed by gluing. It has the advantages of small structural size, simple structural form and easy design; back support is often used in medium and large-diameter reflectors. The reflector is positioned and supported by the blind hole on the back of the reflector, the cone sleeve and the flexible joint connection. The most classic support method is the back three-point support method. Starting from the basic principle of three-point positioning, it can evolve into 6-point, 9-point, 18-point and 27-point support methods.

[0004] At present, the support method for large-diameter reflectors suitable for airborne pods mainly adopts back support. However, the premise of adopting this method is that a structure that matches it needs to be set on the back of the reflector, which undoubtedly makes the overall structure of the reflector assembly complicated, making it difficult to achieve rapid adjustment in the subsequent process, increasing the difficulty of installation of the whole machine, and poor process performance; at the same time, since the main mirror needs to be fixed on the main structure of the camera after processing and adjustment, when fixing, the manufacturing error of the parts, the pre-tightening force of the screws, and the cutting heat generated when matching the pin holes will bring assembly stress, resulting in the displacement or deformation of the mirror surface, among which the influence of the pre-tightening force of the screws is the most obvious. Therefore, the use of the back plate support method during the installation of the reflector assembly will make the reflector assembly less adaptable to external interference.

[0005] Based on the above technical problems, technicians in this field urgently need to develop a flexible support structure for the reflector that adopts a single-point central support method to effectively reduce the surface error of the reflector and eliminate the influence of assembly stress. Summary of the invention

[0006] The object of the present invention is to provide a flexible support structure for a reflector which adopts a single-point central support method to effectively reduce the surface error of the reflector and can eliminate the influence of assembly stress.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A reflector flexible support structure of the present invention comprises:

[0009] reflectors; and

[0010] A flexible flange, wherein the back circumference of the reflector is glued to the inner wall of the inner ring of the flexible flange, and the flexible flange has at least one flexible unit to form a supporting structure;

[0011] The flexible support structure also includes:

[0012] The outer ring of the flexible flange is connected to the back plate by bolts, and the back plate and the reflector are connected to the main optical system by multiple screws.

[0013] Furthermore, the middle part of the reflector is made of microcrystalline material, a light-through hole is provided at the center of the reflector, and the arch part of the reflector is a cylinder.

[0014] Furthermore, the flexible flange is made of Invar material, and the flexible flange includes an inner rigid ring in a circular ring structure, and the inner wall of the inner rigid ring is bonded to the outer circumference of the cylinder;

[0015] The outer rigid ring is in a circular ring structure and is arranged outside the inner rigid ring, and is connected to the back plate through the outer rigid ring.

[0016] Furthermore, the outer rigid ring extends outwardly along the circular ring structure to form three evenly distributed mechanical interfaces, and is connected to the back plate through the mechanical interfaces;

[0017] A rectangular groove is formed between the inner rigid ring and the outer rigid ring, and the rings are connected via three circumferentially evenly distributed flexible arms to form a flexible unit.

[0018] Preferably, the flexible arm adopts an arc-cut flexible hinge structure;

[0019] A plurality of reinforcing ribs are left in the circumferential direction of the outer rigid ring.

[0020] Preferably, a T-shaped groove is provided at the mechanical interface.

[0021] Preferably, a number of second reinforcing ribs are left on the back plate.

[0022] In the above technical solution, the present invention provides a flexible support structure for a reflector, which has the following beneficial effects:

[0023] The flexible support structure of the reflector of the present invention simplifies the design difficulty and engineering implementation difficulty of the reflector assembly, improves the process performance of the reflector assembly, and reduces the difficulty of assembly and adjustment of the whole machine. At the same time, due to the simplicity of processing and assembly, the production cost is reduced and it is suitable for large-scale production; and the adaptability of the assembly to external interference is improved, and the influence of the roughness and unevenness of the installation surface on the surface accuracy of the reflector can be reduced, and the tolerance capacity of the system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the overall structure of a flexible support structure for a reflector provided by an embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of a reflector in a reflector flexible support structure provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a flexible flange in a flexible support structure of a reflector provided by an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of a partial structure of a flexible flange in a flexible support structure of a reflector provided in an embodiment of the present invention;

[0029] Figure 5 A schematic structural diagram of a back plate in a flexible support structure of a reflector provided in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Reflector; 2. Flexible flange; 3. Back plate;

[0032] 11. Light hole; 12. Cylinder;

[0033] 21. Inner rigid ring; 22. Outer rigid ring; 23. Flexible arm; 24. Mechanical interface; 25. T-shaped groove; 26. Rectangular groove;

[0034] 31. Second reinforcement rib. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 to Figure 5 As shown;

[0037] A reflector flexible support structure of the present invention comprises:

[0038] Reflector 1; and

[0039] A flexible flange 2, wherein the back circumference of the reflector 1 is glued to the inner wall of the inner ring of the flexible flange 2, and the flexible flange 2 has at least one flexible unit to form a supporting structure;

[0040] The flexible support structure also includes:

[0041] The back plate 3, the outer ring of the flexible flange 2 is connected to the back plate 3 by bolts, and the back plate 3 and the reflector 1 are connected to the main optical system by multiple screws.

[0042] As a further introduction to this embodiment, the middle part of the reflector 1 is made of microcrystalline material, and a light hole 11 is provided at the center of the reflector 1. Considering the influence of processing cycle, cost and process performance, this solution slightly changes the contour of the back substrate of the reflector to achieve lightweight. Due to the single-point center support method, in order to facilitate installation, the base shape of the reflector 1 adopts a single arch. Compared with the traditional single-arch reflector structure, this solution designs the arch of the reflector 1 as a cylinder 12 with a height of t, which meets the needs of the bonding area of ​​the reflector while adjusting the center of gravity of the reflector.

[0043] As a further introduction to this embodiment, in order to meet the use conditions of the system in a wide temperature range and compensate for thermal stress, the flexible flange 2 is made of Invar material having a linear expansion coefficient close to that of the reflector 1, and the flexible flange 2 includes an inner rigid ring 21 in a circular ring structure, and the inner wall of the inner rigid ring 21 is bonded to the outer circumference of the cylinder 12;

[0044] The outer rigid ring 22 is in a circular ring structure and is arranged outside the inner rigid ring 21 , and is connected to the back plate 3 via the outer rigid ring 22 .

[0045] As a further introduction to this embodiment, the outer rigid ring 22 extends three evenly distributed mechanical interfaces 24 outward along the circular ring structure, and is connected to the back plate 3 through the mechanical interfaces 24;

[0046] A rectangular groove 26 is provided between the inner rigid ring 21 and the outer rigid ring 22 to avoid a rigid connection between the inner ring and the outer ring, and the inner ring and the outer ring are connected via three circumferentially evenly distributed flexible arms 23 as one of the flexible units of the support structure.

[0047] As a preferred technical solution of this embodiment, the flexible arm 23 adopts an arc-cut flexible hinge structure, which can effectively reduce the influence of the unevenness of the mounting surface of the reflector assembly on the reflector surface shape. Figure 5 As shown, the back plate 3 is also made of the same material as the flexible flange 2, that is, Invar. In order to reduce the weight of the reflector assembly, a lightweight design is also performed, leaving a number of second reinforcing ribs 31 on the back plate 3, and the rest is cut off;

[0048] The outer rigid ring 22 has a plurality of reinforcing ribs in the circumferential direction.

[0049] As a preferred technical solution of this embodiment, a T-groove 25 is opened at the mechanical interface 24, which can appropriately increase the radial flexibility of the supporting structure, absorb external loads and release installation stress through its own elastic deformation, and adopt a lightweight design in structure.

[0050] In the above technical solution, the present invention provides a flexible support structure for a reflector, which has the following beneficial effects:

[0051] The flexible support structure of the reflector of the present invention simplifies the design difficulty and engineering implementation difficulty of the reflector assembly, improves the process performance of the reflector assembly, and reduces the difficulty of assembly and adjustment of the whole machine. At the same time, due to the simplicity of processing and assembly, the production cost is reduced and it is suitable for large-scale production; and the adaptability of the assembly to external interference is improved, and the influence of the roughness and unevenness of the installation surface on the surface accuracy of the reflector can be reduced, and the tolerance capacity of the system can be improved.

[0052] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A flexible support structure for a reflector, characterized in that: The flexible support structure comprises: a reflector (1); and A flexible flange (2), wherein the back circumference of the reflector (1) is glued to the inner wall of the inner ring of the flexible flange (2), and the flexible flange (2) has at least one flexible unit to form a supporting structure; The flexible support structure also includes: A back plate (3), an outer ring of the flexible flange (2) is connected to the back plate (3) via bolts, and the back plate (3) and the reflector (1) are connected to the main optical system via multiple screws.

2. A reflector flexible support structure according to claim 1, characterized in that: The middle part of the reflector (1) is made of microcrystalline material, a light through hole (11) is provided at the center of the reflector (1), and the arch part of the reflector (1) is a cylinder (12).

3. A reflector flexible support structure according to claim 2, characterized in that: The flexible flange (2) is made of Invar material, and the flexible flange (2) comprises an inner rigid ring (21) in a circular ring structure, and the inner wall of the inner rigid ring (21) is bonded to the outer circumference of the cylinder (12); The outer rigid ring (22) is in a circular ring structure and is arranged outside the inner rigid ring (21), and is connected to the back plate (3) via the outer rigid ring (22).

4. A reflector flexible support structure according to claim 3, characterized in that: The outer rigid ring (22) extends outward along the circular ring structure to form three evenly distributed mechanical interfaces (24), and is connected to the back plate (3) via the mechanical interfaces (24); A rectangular groove (26) is provided between the inner rigid ring (21) and the outer rigid ring (22), and the rings are connected via three circumferentially evenly distributed flexible arms (23) to form a flexible unit.

5. A reflector flexible support structure according to claim 4, characterized in that: The flexible arm (23) adopts an arc-cut flexible hinge structure; A plurality of reinforcing ribs are left in the circumferential direction of the outer rigid ring (22).

6. A reflector flexible support structure according to claim 4, characterized in that: The mechanical interface (24) is provided with a T-shaped groove (25).

7. A reflector flexible support structure according to claim 4, characterized in that: A number of second reinforcing ribs (31) are left on the back plate (3).

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