| 摘要 |
PURPOSE:To secure prescribed signal characteristic and reflectance even under high temperature and high humidity status even when the coloring of a substrate and a protection film are performed by using alloy of prescribed component as a reflection film. CONSTITUTION:The reflection film 2 is formed on a polycarbonate substrate 1 on which a coloring information signal is formed, and a colored protection film 3 is provided on the reflection film, and a printed 4 disk is formed on the film 3. In such a case, the reflection film 2 is formed by the alloy containing one of Ni and Al setting Cu as a main component. |
