| 摘要 |
PROBLEM TO BE SOLVED: To maintain a reflectivity of a pseudo-solar ray of a specific irradiation intensity excepting a wavelength of a specific numerical value or under at a specific % or over by preventing discoloration of a reflecting body due to deterioration by light and heat by a method wherein one side of a transparent polymeric film is surface treated by a plasma containing a metal, and a silver thin film layer is further formed on the surface treated side. SOLUTION: A transparent polymeric film 10 and a surface treated side 20 by a plasma containing a metal transmit almost an incident light 90 from the transparent polymeric film 10 side. The light 90 reaches a silver thin film layer 30, and is reflected thereon. The surface treated side 20 and the transparent polymeric film 10 transmit the light and the light returns again into an original medium. A thickness of the silver thin film layer is best at about 100nm-200nm. When that is too thin and the film thickness of silver is insufficient, a transmitted light exists to decreas its reflectivity. Therefore, though the reflecting body is irradiated with a pseudo solar ray of 500mW/cm<2> irradiation intensity after cutting ultraviolet with a UV cutting filter of 390nm transmission limit wavelength for 300h, its reflectivity is maintained at 90% or over. |
