CN113848629A

CN113848629A - Reflector supporting structure

Info

Publication number: CN113848629A
Application number: CN202111280455.XA
Authority: CN
Inventors: 关英俊; 辛建儒; 朱俊青
Original assignee: Changchun University of Technology
Current assignee: Changchun University of Technology
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2021-12-28

Abstract

The invention relates to a reflector supporting structure, which is characterized in that a fiber bundle which is consistent with a reflector substrate material is used, a reflector is connected with a reflector back plate, pretightening force is applied to the fiber bundle to limit the reflector, and silicon rubber is filled between the reflector and the reflector back plate to realize impact resistance of the reflector. The reflector supporting structure solves the problem that the existing reflector supporting structure cannot be stable and impact resistant in a mechanical environment, so that the reflector structure has the advantages of stable structure and impact resistance.

Description

Reflector supporting structure

Technical Field

The invention belongs to the technical field of applied optics, and particularly relates to a reflector supporting structure with a stable structure and impact resistance.

Background

The reflector is a core part of a high-precision optical instrument, and the reflector bears the surface of the high-precision reflector, so that the requirement on the surface shape of the reflector is high (nm magnitude), so that the reflector substrate is usually made of high-specific-stiffness materials such as optical glass and SiC, but the mechanical connection performance of the optical glass and the SiC material is poor, and the reflector needs to be installed on a reflector back plate made of a metal material to form a reflector assembly, and then the reflector assembly is installed on a frame. Meanwhile, the optical back plate needs to weaken the influence of a force-heat environment on the surface shape of the reflector through a certain structural design, so that the stability of the high-precision optical surface is realized.

The existing reflector supporting structure is mostly installed on a reflector back plate by adopting two modes: a uses the optical epoxy glue to bond the reflector and mechanical part, the thickness of the bonding is about 0.02mm, the reflector assembly formed by this method has higher rigidity, smaller damping, can keep the position of the reflector relative to the reflector back plate well, but because the structural damping is smaller, the ability to resist thermal shock, mechanical shock is poorer; in another mode, silicon rubber is used for filling a gap between the reflector and the reflector back plate, the size of the gap is in millimeter magnitude, the typical value is 3mm, the reflector assembly formed by the method has high damping, and the influence of thermal shock and mechanical shock on the reflector can be well weakened, but the silicon rubber belongs to a non-metal material, so that after the reflector assembly is subjected to a mechanical environment, the pose of the reflector relative to the reflector back plate is difficult to maintain in a high-precision manner, and the reflector assembly cannot be applied to the condition that the rigid displacement tolerance of the reflector is restricted strictly.

With the development of aerospace, impact environments are ubiquitous, and in the face of harsher impact environments, how to improve the impact environment adaptability of a reflector component is an urgent problem to be solved on the premise of keeping the stability of a reflector structure.

Disclosure of Invention

Aiming at the application requirement of the reflector in an impact environment, the invention provides the reflector support structure with stable structure and impact resistance, which can improve the impact resistance of the reflector component while keeping the stable structure of the reflector.

The purpose of the invention is realized as follows:

a reflector supporting structure is characterized by comprising a reflector (1), a fiber bundle (2), a silicon rubber bonding block (3) and a reflector back plate (4);

one end of the fiber bundle (2) is bonded to the periphery of the reflector, and the other end of the fiber bundle is bonded to the reflector back plate (4).

The number of the fiber bundles (2) can be adjusted according to actual conditions, and a plurality of groups of fiber bundles are adopted to restrain the reflector.

The fiber bundle (2) has a certain pretightening force to ensure that the fibers are in a tensioning state.

And a gap is reserved between the reflector (1) and the reflector back plate (4), and the silicon rubber is filled in the gap at multiple points or completely to form a silicon rubber bonding block (3).

The invention has the following advantages and positive effects:

1. according to the invention, the reflector and the reflector back plate are connected through the fiber bundle with a certain pretightening force, silicon rubber is filled between the reflector and the reflector back plate, and the reflector is limited through the fiber bundle, so that the reflector component is ensured to be stable in structure and not to be eccentric, thereby influencing imaging; the silicon rubber is utilized to improve the structural damping and realize the impact resistance of the structure.

2. The invention has the characteristics of simple and compact structure, light weight, easy processing and manufacturing and low cost, and is suitable for the requirement of mass manufacturing.

Drawings

FIG. 1 is a schematic view of a mirror support structure;

FIG. 2 is a schematic view of a fiber bundle structure;

FIG. 3 is a schematic view of a fiber bundle tension assembly;

fig. 4 is a schematic diagram of a specific example.

Detailed description of the preferred embodiment

The embodiment is described with reference to fig. 1 to 4, and the support structure suitable for the reflector of the space camera comprises a reflector (1), a fiber bundle (2), a silicon rubber bonding block (3) and a reflector back plate (4);

the diameter of the reflector (1) is 100mm, and the thickness is 16 mm; the reflector adopts a peripheral supporting structure, the outer diameter of the reflector back plate (4) is 118mm, the inner diameter of the reflector back plate is 106mm, the thickness of the reflector back plate is 15mm, and the gap between the reflector back plate and the reflector is 3 mm;

the reflector and the fiber bundle are made of quartz, and the reflector back plate is made of invar steel.

The reflector back plate (4) and the reflector (1) are fixed by using a clamp, and the positions are adjusted to enable the central lines of the reflector and the reflector to be coaxial and to be fixed in a constrained manner; 6 blind holes with the diameter of 3mm are uniformly distributed on the periphery of the reflector and are used for being bonded with the fiber bundle; correspondingly, 6 through holes with the diameter of 3mm are arranged at corresponding positions on the side surface of the reflector back plate and are used for being bonded with the fiber bundles;

further, as shown in fig. 3, after 6 groups of fiber bundles pass through the through holes on the side surface of the reflector back plate, the blind holes on the periphery of the reflector are plugged, and the fiber bundles and the reflector are bonded by using epoxy resin;

then, applying the same tension to each fiber of 6 groups of fibers through a pulley tool to enable the fiber bundle to be in a tension state;

as shown in fig. 3, epoxy resin is injected from the glue injection port of the reflector back plate to fix the fiber bundle, and the fiber bundle applying the tension is glued to the reflector back plate;

then, filling a gap between the reflector and the reflector back plate near the 6-position fiber by using silicon rubber to form a silicon rubber bonding block;

finally, the excess fiber bundle is removed, completing the assembly of the mirror assembly.

The above examples only express preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A reflector supporting structure is characterized by comprising a reflector (1), a fiber bundle (2), a silicon rubber bonding block (3) and a reflector back plate (4).

2. A mirror support according to claim 1, wherein the bundle of fibres (2) is bonded at one end to the mirror periphery and at the other end to the mirror back plate (4).

3. A mirror support according to claim 1, wherein the fiber bundle (2) is provided with a pre-tension force ensuring that the fibers are under tension.

4. A mirror support according to claim 1, wherein the gap between the mirror and the mirror back is filled with silicone rubber at a plurality of points or entirely to form a silicone rubber adhesive block (3).

5. A mirror support according to claim 1, wherein the number of fibre bundles (2) is adjustable to suit the application, and several groups of fibre bundles are used to constrain the mirror.