| 摘要 |
A fiber reinforced plastic reflector has a sandwich construction and comprises a core, two fiber reinforced plastic plates which are secured to opposite sides of the core, and a reflecting film which is formed on the outer surface of one of the fiber reinforced plastic plates. The core is made from an isotropic material having a low density and a low linear expansion coefficient. In one form of the invention, the core is a plate of a material selected from a uniform foamed metal having a density of 0.1-1.0 g/cm3; uniform, porous glass having a density of 0.05-1.0 g/cm3; and a uniform, porous ceramic having a density of 0.3-1.0 g/cm3. In another form of the invention, the core is a corrugated sheet and a flat sheet which is secured to at least one side of the corrugated sheet, the corrugated sheet and said flat sheet being made of a material selected from a uniform Kevlar fiber reinforced plastic having a density of 0.03-1.0 g/cm3, a uniform ceramic having a density of 0.03-1.0 g/cm3, and a uniform carbon fiber reinforced plastic having a density of 0.03-1.0 g/cm3.
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