JP2005217696A - Membrane reflector and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a membrane reflector for an artificial satellite giving less effect on the mirror surface accuracy due to a temperature change and needing less number of components. <P>SOLUTION: The membrane reflector for mount on the artificial satellite includes: the membrane reflector; a coupling component 3 formed to be a closed shape adhered to a rear side of the membrane reflector; and a rear face structure 2 of the membrane reflector inserted and located to the coupling component 3 perpendicularly to the rear side of the membrane reflector. Thus, the effect on the mirror surface accuracy due to a temperature change is reduced and the number of coupling components is decreased. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a membrane reflector mounted on an artificial satellite and a manufacturing method thereof.

  It is well known that there are various types of reflectors currently mounted on artificial satellites.

  Among these various reflectors, there is a membrane reflector that has a thin plate-like surface made of a composite material with a biaxial or triaxial woven fabric made of reinforcing fibers as a reinforcing material for the purpose of weight reduction. As a method for connecting the back structure portion and the mirror surface portion, L-shaped, box-shaped, or a combination of a cylindrical component and a plate is known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-270922 (FIGS. 1-3 and 7)

  Due to the recent trend to increase the frequency of reflectors due to the increase in communication capacity and cost reduction requirements for reflectors, there has been a demand for membrane reflectors that are simpler and can handle high frequencies. However, conventional membrane reflectors are inexpensive. The back structure and the mirror surface are combined using a large L-shaped part or an expensive box-shaped or cylindrical part-plate combination part. As described in Patent Document 1, an L-shaped component made of a laminated composite material has different coefficients of thermal expansion in the in-plane direction and in the out-of-plane direction, so that the angle changes due to a temperature change and deteriorates the mirror surface accuracy of the reflector. There is a concern, and there is a problem that the number of parts increases when the box or cylindrical part is combined with the combination part of the plate.

  The present invention has been made to solve the above-described problems, and is intended to reduce the influence on the mirror accuracy of the reflector with respect to temperature changes at a low cost by combining the mirror surface portion and the back structure portion of the membrane reflector. It aims at joining, and also aims at providing the method of manufacturing this joining component cheaply.

  The membrane reflector of the present invention is a membrane reflector for an artificial satellite, and is formed of a reflecting mirror surface portion having a reflecting mirror surface and a resin or metal plate having a closed curved surface shape, and a part of the closed curved surface is formed by the reflecting mirror surface portion. A plurality of coupling parts bonded to the back surface side of the reflecting mirror surface, and disposed on the back surface side of the reflecting mirror surface portion, and bonded to the other surface side facing a part of the closed curved surface in each of the coupling components. And a back surface structure that supports the reflecting mirror surface portion.

  The manufacturing method of the membrane reflector of the present invention includes a first step of setting a cloth material in which a film having releasability is laid on a mold for the mirror reflector mirror surface and impregnated with an uncured resin thereon, A second step of setting a mold having a surface release treatment on a cloth material impregnated with an uncured resin, and setting a back structure on the mold, and an uncured resin to wrap the mold Lifting the impregnated cloth material, adhering it to the back structure, removing the mold after curing, applying the adhesive between the connecting part integrated with the back structure and the mirror surface part, and adhering 4 steps.

  Depending on the closed shape coupling component of this invention, even if there is a difference in the thermal expansion coefficient between the in-plane direction and the out-of-plane direction of the component, there is little change in shape due to temperature change, and even when the temperature of the membrane reflector fluctuates. Since the back surface structure and the mirror surface portion can be coupled without deviating from each other, there is an effect that the coupling can be performed at low cost and with little influence on the reflector mirror surface accuracy with respect to temperature change.

Embodiment 1 FIG.
FIG. 1 is a diagram for explaining Embodiment 1 of the present invention, and FIG. 1 (a) shows a connecting portion between a mirror surface portion and a back surface structure of a membrane reflector according to Embodiment 1, FIG. 1 (b). And FIG.1 (c) shows sectional drawing of the coupling | bond part in a different position of a reflector.
In FIG. 1, the mirror surface portion 1 of the membrane reflector is coupled to the back structure 2 by a coupling component 3 having a closed shape.

  In such a closed joint component, the thermal expansion coefficient in the in-plane direction that is parallel to the mirror surface portion 1 of the membrane reflector and in the out-of-plane direction that is perpendicular to the mirror surface portion 1 of the membrane reflector. Even if there is a difference, there is little shape change due to temperature change. Therefore, even when the temperature of the membrane reflector fluctuates, the membrane reflector can be coupled without upsetting the relationship between the back surface structure and the mirror surface portion. Here, the thermal expansion coefficient in the in-plane direction is about 0 to 3 ppm, and the thermal expansion coefficient in the out-of-plane direction is about 20 to 60 ppm. Therefore, distortion occurs due to the difference in thermal expansion between the in-plane direction and the out-of-plane direction of the coupling component due to the temperature change. Therefore, when the back structure and the mirror surface portion are configured to be rigid, the mirror surface portion 1 of the membrane reflector Although distortion will occur, the distortion can be absorbed if the coupling component has springiness as in the present invention.

  In addition, this joining part is manufactured by molding with resin, and both sides of the back structure are composed of one part, so it can be joined by conventional L-shaped joining parts or combination parts of box-shaped or cylindrical parts and plates Compared to parts, it has fewer parts and can be manufactured at lower cost.

Embodiment 2. FIG.
FIG. 2 shows a joint portion between the mirror surface portion and the back surface structure of the membrane reflector according to the second embodiment.
In FIG. 2, the mirror surface portion 1 of the membrane reflector is coupled to the back structure 2 by a coupling component 3 having a closed shape.

  In such a closed joint component, the thermal expansion coefficient in the in-plane direction that is parallel to the mirror surface portion 1 of the membrane reflector and in the out-of-plane direction that is perpendicular to the mirror surface portion 1 of the membrane reflector. Even if there is a difference, there is little shape change due to temperature change. Therefore, even when the temperature of the membrane reflector fluctuates, the membrane reflector can be coupled without upsetting the relationship between the back surface structure and the mirror surface portion. Here, the thermal expansion coefficient in the in-plane direction is about 0 to 3 ppm, and the thermal expansion coefficient in the out-of-plane direction is about 20 to 60 ppm.

  In addition, this connecting part is composed of one part on both sides of the back structure, and in a connecting part having a small adhesion area to the mirror surface part, it is the same part regardless of the angle between the mirror surface part and the back structure. Therefore, the number of parts can be reduced and the manufacturing cost can be reduced as compared with the conventional L-shaped connecting parts, box-shaped parts, and connecting parts made of a combination of cylindrical parts and plates.

Embodiment 3 FIG.
FIG. 3 shows a manufacturing process in which a coupling member having a closed shape is molded by impregnating an uncured resin with a cloth material.
(A) First step (see FIG. 3 (a)): a film 5 having releasability is laid on a mold 4 on the mirror reflector mirror surface, and a cloth material 6 impregnated with an uncured resin is placed thereon. set.
(B) Second step (see FIG. 3 (b)): A molding die 7 whose surface is subjected to mold release treatment is set on a cloth material 6 impregnated with uncured resin, and a back structure 2 is set thereon. To do.
(C) Third step (see FIG. 3 (c)): Lift the cloth material 6 impregnated with uncured resin so as to wrap the molding die 7, adhere to the back structure, and after curing, remove the molding die from the depth direction. Pull out.
(D) Fourth step (see FIG. 3 (d)): Adhesive 8 is applied and bonded between the coupling part integrated with the back structure and the mirror surface part.

  According to the manufacturing method of the coupling member as described above, the coupling member can be manufactured at low cost using the same mold even if the angle formed by the back surface structure and the mirror surface portion varies depending on each location of the reflector. I can do it.

It is a figure for demonstrating Embodiment 1 of this invention. It is a figure for demonstrating Embodiment 2 of this invention. It is a figure for demonstrating Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Membrane reflector mirror surface part, 2 Membrane reflector back structure, 3 Joining parts, 4 Membrane reflector mirror molding mold, 5 Releasable film, 6 Cross material impregnated with uncured resin, 7 Mold for joining parts , 8 Adhesive that joins the coupling part and the mirror reflector mirror surface.

Claims (7)

In membrane reflectors for satellite installations,
A reflecting mirror surface portion having a reflecting mirror surface;
A plurality of coupling parts formed of a resin or metal plate having a closed curved surface shape, and a part of the closed curved surface bonded to the back surface side of the reflecting mirror surface in the reflecting mirror surface portion;
A membrane provided on the back surface side of the reflecting mirror surface portion and bonded to the other surface facing the part of the closed curved surface in each of the coupling parts, and a back surface structure for supporting the reflecting mirror surface portion Reflector. The coupling component has a spring property in a direction perpendicular to the joint surface with the reflecting mirror surface portion and a surface direction in a part of the closed curved surface, and has an opening in the other surface of the closed curved surface, 2. The membrane reflector according to claim 1, wherein the back structure is inserted into and fixed to the opening. The membrane reflector according to claim 2, wherein the coupling component is made of a composite material. 3. The membrane reflector according to claim 2, wherein the coupling component is a bag having a spring property. 5. The structure according to claim 1, wherein a part or all of the coupling component and the back surface of the membrane reflector and a part or all of the coupling component and the back surface structure of the membrane reflector are bonded together. The membrane reflector described. 6. A device according to claim 1, wherein there is a certain gap between the coupling component and the back surface of the membrane reflector, and the gap between the coupling component and the back surface structure of the membrane reflector is as small as possible. The membrane reflector described in 1. A first step in which a film having releasability is laid on the mold of the mirror reflector mirror surface, and a cloth material impregnated with an uncured resin is set thereon;
A second step of setting a mold having a surface release treatment on a cloth material impregnated with an uncured resin, and setting a back structure thereon;
A third step of lifting the cloth material impregnated with uncured resin so as to wrap the mold, adhering it to the back structure, and extracting the mold after curing;
A method of manufacturing a membrane reflector, comprising: a fourth step of applying and bonding an adhesive between a connecting part integrated with a back structure and a mirror surface portion.

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