JP2012160827A - Membrane reflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane reflector to be loaded on an artificial satellite in which deterioration of mirror surface accuracy due to hardening and contraction is reduced when the membrane reflector 3 and a coupling member 2 in a closed shape adhering to the back face of the membrane reflector are bonded.SOLUTION: In the membrane reflector to be loaded on an artificial satellite, a reinforcement member 5 of the same material as the membrane reflector is molded integrally in an adhesion region where a coupling component 2 is bonded to the back face of the membrane reflector when molding the membrane reflector 3. Since the reinforcement member 5 is molded integrally, the out-of-plane rigidity of the membrane reflector is increased at a part where the coupling component 2 is bonded, and deterioration of mirror surface accuracy due to hardening and contraction is reduced when bonding the coupling member and the membrane reflector.

Description

  The present invention relates to a membrane reflector mounted on an artificial satellite. In particular, the present invention relates to a satellite reflector for mounting on an artificial satellite provided with a reinforcing member in a coupling region that couples a membrane reflector and a back structure that supports the membrane reflector from the back side.

  Currently, there are various types of reflectors mounted on artificial satellites. Among them, for the purpose of reducing the weight of the reflectors, the mirror surface of the reflectors is made of a composite material using a biaxial or triaxial fabric made of reinforcing fibers as a reinforcing material. There is a membrane reflector having a structure in which a thin plate (membrane) -like film surface is used and the film surface is supported from the back side to maintain the reflecting mirror surface. As a coupling component for coupling the mirror surface portion (thin plate-shaped membrane surface) of the membrane reflector and the back structure, a bag-shaped coupling component having a T-shaped cross section has been proposed (for example, Patent Documents). 1 and 2).

JP-A-10-270922 JP 2005-217696 A

  The membrane reflector has a very thin out-of-plane rigidity because the mirror surface portion is a thin plate (membrane) -like membrane surface made of a composite material with a biaxial or triaxial fabric made of reinforcing fibers as a reinforcing material. In the conventional membrane reflector, the back structure and the mirror surface portion are coupled using an inexpensive L-shaped component or an expensive box-shaped or cylindrical component-plate combination component. As described in Patent Document 1, an L-shaped part made of a laminated composite material has different coefficients of thermal expansion in the in-plane direction and in the out-of-plane direction. There is a problem that the number of parts increases in the combination of a box-shaped or cylindrical part and a combination part of a plate. In addition, as described in Patent Document 2, strain can be absorbed by using a coupling component having a closed shape having spring properties. Even in this case, the bonding between the coupling component and a thin plate (membrane) is possible. There is a concern that the mirror surface accuracy of the reflector may be deteriorated due to deformation of the thin plate (membrane) due to curing shrinkage of the adhesive, which has been a problem in securing communication accuracy.

  The object of the present invention was made in view of the above-mentioned problems, and by increasing the rigidity of the adhesion part on the back side of the membrane reflector, which is the cause of the deterioration of the mirror surface accuracy of the membrane reflector, preventing the deterioration of the mirror surface accuracy, To provide a membrane reflector capable of improving the stability of communication.

  The membrane reflector according to the present invention provides a thin film-like film surface constituting a mirror surface part having a mirror surface, and the film from the back surface side of the mirror surface in the mirror surface part so that a shape formed by the film surface is a predetermined mirror surface shape. A back surface structure supporting the surface, the film surface includes a doubler for reinforcement on the back surface side, and the doubler and the back surface structure are fixed

  According to the membrane reflector according to the present invention, it is possible to increase the out-of-plane rigidity of the membrane reflector at the part to which the coupling component is bonded, and it is possible to prevent the deterioration of the mirror surface accuracy and improve the stability of the communication accuracy. .

It is a figure explaining the membrane reflector which concerns on Embodiment 1, (a) The perspective view which shows the coupling | bond part of the mirror surface and back surface structure of the membrane reflector 1, (b) It is sectional drawing which shows the cross section of a coupling | bond part. 1 is an overall view on the back side of a membrane reflector 100 according to Embodiment 1. FIG. It is a figure explaining other examples of the membrane reflector which concerns on Embodiment 1, (a) The perspective view which shows the coupling | bond part of the mirror surface and back surface structure of the membrane reflector 1, (b) It is sectional drawing which shows the cross section of a coupling | bond part. is there. It is a figure which shows the shape and coupling | bond part of the doubler which concerns on Embodiment 2. FIG. FIG. 6 is an overall view on the back side of a membrane reflector 100 according to a second embodiment. It is a figure which shows the shape and coupling | bond part of the doubler which concerns on Embodiment 3. FIG. It is the figure which showed the shape of the doubler which concerns on Embodiment 3, and the coupling | bond part which excluded the coupling component 2. FIG.

Embodiment 1
1 and 2 are views for explaining a membrane reflector 100 according to Embodiment 1 of the present invention. FIG. 1A is a perspective view showing a connecting portion between a mirror surface portion and a back structure of the membrane reflector 100. FIG.1 (b) shows sectional drawing of a coupling | bond part. FIG. 2 is an overall view of the back side of the membrane reflector 100.
1 (a) and 1 (b), a membrane reflector 100 includes a dish 3 that is a thin plate (membrane) -like film surface that constitutes a reflector mirror surface portion, a doubler 5 that is a reinforcing member that reinforces the dish 3, and a dish. 3 includes a back structure 1 that is provided on the back side of 3 and supports the dish 3, and a connecting component 2 that connects the mirror surface portion of the reflector and the back structure.

The dish 3 is formed into a predetermined shape by subjecting a thin plate material to heating and pressurizing treatment using a prepared membrane reflector mirror mold.
In the membrane reflector 100 according to the first embodiment, when the dish 3 is formed, the doubler 5 is integrally formed at a predetermined position on the back surface side of the mirror surface portion simultaneously with the formation of the dish 3. The dish 3 and the doubler 5 are made of the same material, and for example, carbon fiber reinforced plastic (CFRP (Carbon Fiber Reinforced Plastics)) or the like is used.
By providing the doubler 5 integrally with the dish 3 on the back side, which is the convex side of the mirror surface portion, the rigidity can be locally increased within the surface of the dish 3 having a very small out-of-plane rigidity.

  The back structure 1 is a structure that is supported from the back side of the thin plate-like film surface (dish 3) so that the mirror surface portion acts as a predetermined reflecting mirror, and is disposed on the entire back side of the dish 3. . The back structure 1 is composed of a plurality of rectangular plate-like reinforcing pieces having a width direction in the axial direction of the membrane reflector 100. The plurality of plate-like reinforcing pieces are arranged in a lattice shape to increase rigidity, and the shape of the dish 3 is It supports so that it may become a predetermined shape.

The coupling component 2 is formed of a resin or metal plate having a closed curved surface shape as shown in FIG. 1B, and a wide portion corresponding to the bottom surface of the closed curved surface shape is fixed to the back side of the film surface (dish 3). Is done. Further, as shown in FIG. 1B, the upper end portion of the coupling component 2 is fixed to the back structure 1, and the mirror surface portion and the back structure 1 are coupled.
By having a closed curved surface shape as shown in FIG. 1 (b), the coupling component 2 has a spring property, so even if the relative positional relationship between the mirror surface and the back structure 1 is distorted due to temperature change, this distortion is caused. Can be absorbed.
However, when it is intended to fix the connecting part 2 having such a closed curved surface shape to the dish 3 directly with the adhesive at the wide bottom surface portion, the shape of the dish 3 in the region where the adhesive is applied by the curing shrinkage of the adhesive. Will also deform. The shape of the dish 3 is deformed, and as a result, the characteristics of the reflector such as a focus shift are deteriorated.

  As a countermeasure against this, in the first embodiment, as shown in FIG. 1B, a doubler 5 as a reinforcing member is integrally formed in advance at a position where the coupling component 1 is fixed with an adhesive on the back side of the dish 3. The connecting part 2 is fixed to the doubler 5 with the adhesive 4. Since the mirror surface is thick at a place where the doubler 5 is present, it is possible to suppress the influence of curing shrinkage of the adhesive that fixes the coupling component 2 and the dish 3.

As described above, in the membrane reflector according to the first embodiment, the doubler 5 as a reinforcing member is integrally formed on the back side of the mirror-shaped dish 3, and the doubler 5 integrally formed with the dish and the back structure 1 are combined. The parts 2 were used for bonding with an adhesive.
By connecting the connecting part 2 to the doubler 5 with an adhesive, it is possible to suppress a decrease in specular accuracy due to curing shrinkage of the dish 3 at the time of bonding, which has conventionally occurred when the connecting part is bonded to the dish 3 with an adhesive. can do.

In the above description, the doubler 5 and the back structure 1 are fixed using the connecting component 2. However, the connecting component 2 is omitted and the doubler 5 and the back structure 1 are directly fixed with an adhesive or the like. You may do it.
FIG. 3 shows another example of the membrane reflector according to the first embodiment, and shows another example of joining the mirror surface part and the back structure. Thus, the doubler 5 and the back structure 1 may be directly fixed with an adhesive or the like without using the coupling component 2 that absorbs the effect of strain due to temperature change.

Embodiment 2
In the first embodiment, the doubler 5 as the reinforcing member is integrally formed in a strip shape on the entire back side of the dish 3. However, in the second embodiment, the coupling component 2 that joins the mirror surface portion and the rear structure 1 is fixed. Reinforcing members are provided only at the points.

FIG. 4 is a diagram showing a doubler shape of the membrane reflector 100 according to the second embodiment. FIG. 5 is a view showing the entire back side of the membrane reflector 100. In FIG. 4, a doubler 51 is formed on the back side of the dish 3, and is coupled to the back structure 1 that supports the dish 3 with the coupling component 2 interposed therebetween. The coupling component 2 and the doubler 51 are bonded with an adhesive 4.
Here, the doubler 51 is formed only at a location where the coupling component 2 is coupled to the dish 3, and a plurality of doublers 51 are formed in an island shape on the entire back side of the dish 3. The doubler 51 is formed by integral molding with the dish 3. In this way, by providing the doubler 51 so as to be separated at the location where the coupling component 2 and the dish 3 are coupled to each other, only the coupling portion with the coupling component 2 is locally present within the surface of the dish 3 having very low out-of-plane rigidity. The rigidity can be increased. By separating and arranging the doublers, it is possible to suppress deformation in a specific direction of the thin plate (membrane) due to the doubled arrangement.

  As described above, in the second embodiment, the doubler 51 is dispersedly arranged in the surface on the back surface side of the dish 3, so that the rigidity of the bonded portion on the back surface side of the dish to which the joining component is bonded due to the deterioration of the mirror reflector mirror surface accuracy is adhered. In addition, since the doublers 51 are arranged in a distributed manner, deformation of the thin plate (membrane) in a specific direction due to the provision of the doublers can be suppressed.

  Note that the doubler 51 and the dish 3 may not be integrally formed, and the doubler 51 and the dish 3 may be formed in separate steps, and the dish 3 and the doubler 51 may be bonded later with an adhesive.

  In the above description, the doubler 51 and the back structure 1 are fixed using the coupling component 2. However, the coupling component 2 is omitted and the doubler 51 and the back structure 1 are directly fixed with an adhesive or the like. You may make it do.

Embodiment 3
In the first and second embodiments, the doubler and the dish are integrally molded, or the entire surface of the doubler is bonded to the back side of the dish with an adhesive, and the doubler and the dish are used as an integral part. In Form 3, a convex doubler is prepared, and the convex doubler and the back side of the dish 3 are partially bonded with an adhesive.

  FIG. 6 shows the shape of the doubler 52 according to the third embodiment. As shown in FIG. 6, a convex doubler 52 is prepared, and the end of the doubler 52 is fixed with the dish 3 with an adhesive. The joining component 2 is fixed to the central portion of the convex doubler 52 with an adhesive or the like.

  Even in this case, it is possible to increase the out-of-plane rigidity of the membrane reflector at the part to which the coupling component 2 is bonded, and it is possible to prevent the deterioration of the mirror surface accuracy and improve the stability of the communication accuracy.

  In FIG. 6, the connecting part 2 is used when the doubler 52 and the back structure 1 are connected. However, the connecting part 2 is omitted and the back structure 1 and the doubler 52 are connected as shown in FIG. You may make it adhere | attach with the adhesive agent 4 directly. The convex doubler 52 can also absorb the distortion caused by the temperature change and have a buffer function of the coupling component 2.

DESCRIPTION OF SYMBOLS 1 Back structure, 2 connection parts, 3 dishes, 4 adhesives, 5 doubler (reinforcement member), 51 doubler (reinforcement member), 52 doubler (reinforcement member), 100 membrane reflector.

Claims (3)

A thin plate-like film surface constituting a mirror surface portion having a mirror surface;
A back structure that supports the film surface from the back side of the mirror surface in the mirror surface part, so that the shape formed by the film surface is a predetermined mirror surface shape;
With
The membrane reflector includes a doubler for reinforcement on the back side, and the doubler and the back structure are fixed. A thin plate-like film surface constituting a mirror surface portion having a mirror surface;
A back structure that supports the film surface from the back surface side of the mirror surface in the mirror surface portion, so that the shape formed by the film surface becomes a predetermined mirror surface;
A coupling component between the membrane surface and the back structure, for securing the membrane surface to the back structure;
With
The membrane surface includes a doubler for reinforcement on the back side, the doubler and the coupling part are fixed by a fixing material, and the coupling part and the back structure are fixed. Membrane reflector. A membrane reflector mounted on an artificial satellite, wherein the membrane surface and the doubler are made of carbon fiber reinforced plastic (CFRP), and the membrane surface and the doubler are integrally formed. The membrane reflector according to any one of Items 1 and 2.

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