| 摘要 |
PURPOSE:To obtain the titled reflector capable of controlling a transmittance for a visible ray and a reflectance for the Infra-red ray with a numerical aperture and having a high reflecting effect and a good durability by forming a reflecting film on a substrate which is composed of a resin having a transmission property for the visible ray and has the numerical aperture on a part of the substrate. CONSTITUTION:The metal alloy film 2 composed of one or more than two kinds of metals selected from the group comprising Ag, Al, Ti, Cr, Zn, Au, Ta, Ni, Cu, Co, Pt and Rh are formed on a surface or both surfaces of the resin substrate composed of a polyester and a polycarbonate and having the transmittance for the visible ray according to a vapor-depositing or a printing method. The substrate has the aperture having a desired shape such as a disc and a stripe as shown by an oblique line. The numerical aperture is preferable to be 20-80% range. The titled reflector is suitable for the apparatus for a window use or for an effective use of an energy due to the reflectance of the infra-red ray by changing the numerical aperture so as to be the desired reflectance for the infra-red ray and the desired transmittance for the visible ray.
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