JPH01130605A - Antenna reflector - Google Patents

Abstract

PURPOSE:To prevent deformation at forming by laminating fiber reinforced plastic layers using a cloth whose reinforced fibers are made orthogonal to each other while deviated by 45 deg. as a skin member. CONSTITUTION:The skin member 2 is formed by laminating a fiber reinforced plastic layer 4 using the cloth woven by the reinforced fibers 3 such as carbon fibers placed orthogonally as the reinforced member and using the thermosetting resin such as an epoxy resin as a matrix in a way that the reinforced members 3 are oriented in the order of O deg./90 deg., + or -45 deg., 0 deg./90 deg.. The difference from the stiffness of the skin member depending on the direction is compensated by using a 2nd layer fiber reinforced plastic layer 4 of + or -45 deg. to prevent the deformation due to a thermal stress caused by a temperature change from a high temperature at the forming to room temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna reflector mounted on an artificial satellite, for example.

[Conventional technology]

FIG. 3 shows, for example, Natl SAMPE Symp E.
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It is a perspective view showing the conventional antenna reflector shown in J. In the figure, (1) is a core material such as an aluminum honeycomb core, (2) is a skin material, and one reinforcing fiber (3) is oriented in one direction. Multiple fiber reinforced plastic layers (4
) are laminated so that the reinforcing fibers (3) are oriented at 06 and 90 degrees.

In a conventional antenna reflector, the skin material (2) is made of fiber-reinforced plastic M (4) laminated in the above direction, for example, one-way reinforced blip-preg is laminated at O°/90°/90°.
It was constructed by laminating four layers in the order of 10 degrees.

[Problem that the invention seeks to solve]

However, in the conventional structure oriented at 0° and 90° as described above, the stiffness of the 5 skin material (2) differs depending on the direction, so the temperature flux due to returning from the high temperature during molding to room temperature is the weakest stiffness +45 There has been a problem in that large deformations are concentrated in the 145° or -45° direction.

This invention was made to solve the above-mentioned problems, and its purpose is to obtain an antenna lifter that can reduce the deformation of the skin material when the temperature is returned to room temperature from the high temperature during molding. do.

[Means for solving problems]

The antenna reflector according to the present invention has a sandwich structure in which skin materials are laminated on both sides of a core material. It uses a skin material in which reinforcing fibers are laminated so that they are oriented in the (0°/90°) and (±45°) directions.

[For production]

In this invention, the reinforcing fibers are O', 90@.

By using a skin material in which fiber-reinforced plastic layers are laminated in an orientation of ±45°, the difference in rigidity due to direction is reduced, and as a result, the coefficient of thermal expansion is the same, and the temperature can be returned to room temperature from the high temperature during molding. This prevents deformation in the closed state.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view thereof. In the figures, the same reference numerals as in FIG. 3 indicate the same or corresponding parts. The skin material (2) is reinforced with a cloth made by weaving reinforcing fibers (3) such as carbon fibers orthogonally to each other, and the fiber reinforced plastic layer (4) is made of a thermosetting resin such as epoxy resin as a matrix. Reinforced fiber (
3) is (0°/90@).

(±45@) and (0''/90@). (5) is an adhesive (for example, a film) that adheres the core material (1) and the skin material (2). epoxy adhesive).

In the antenna reflector configured as described above, the first skin material (2) has a second layer of ±45° fiber reinforced plastic layer (4) to suppress the difference in rigidity due to the direction, and to change the stiffness from high temperature during molding to room temperature. Deformation due to thermal strain is prevented.

By the way, in the above explanation, the case where the present invention is used as a skin material of an antenna reflector has been described, but it goes without saying that it can also be used in the construction of a sandwich board made of other FRP.

〔Effect of the invention〕

As explained above, this invention has the effect of preventing deformation during molding by laminating fiber-reinforced plastic layers, each of which is reinforced by a cross in which reinforcing fibers are orthogonal to each other, at an angle of 45 degrees, as the skin material of the antenna reflector. There is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a perspective view showing a conventional example. In each figure, the same reference numerals indicate the same or corresponding parts, (1)
is core material, (2) is skin material, (3) is reinforcing fiber, (4)
is a fiber-reinforced plastic layer, and (5) is an adhesive.

Claims (1)

[Claims] (1) In an antenna reflector with a sandwich structure in which skin materials are laminated on both sides of a core material, a fiber-reinforced plastic layer whose reinforcement material is a cloth made by weaving reinforcing fibers perpendicularly to each other, and the reinforcing fibers are (0 An antenna reflector characterized by using skin materials laminated so as to be oriented in the directions of (°/90°) and (±45°).