| 摘要 |
PURPOSE:To smooth the boundary between an underlying film consisting of a transparent dielectric and a recording film and to improve the sensitivity (recording speed) of an optical recording medium by forming the underlying film on a substrate, then subjecting the underlying film to a heat treatment at and for a specific temp. and time and forming the optical recording film on the underlying film. CONSTITUTION:The transparent dielectric is used for the material of the underlying film of the recording film to be formed on the substrate and is exemplified by CeO2, SnO2, TiO2, ZnS, etc., having a high refractive index. After the underlying film is formed by a vacuum film forming method such as sputtering or vapor deposition method, the underlying film is subjected to the heating treatment for 5-200min at the temp. in a 60-200 deg.C range and the recording film is formed on the underlying film; further, the protective film is formed thereon. The ruggedness on the surface is thereby smoothed and the surface film is removed, by which the impurities in the film are removed and the factors to prohibit the migration of the atoms or molecules in the recording film are decreased. As a result, the speed of recording (erasure) is improved.
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