| 摘要 |
PURPOSE:To shorten the time for crystallization and to obtain a high information transfer rate by providing a polycrystal film in contact with a recording film. CONSTITUTION:An underlying film 2 having grooves for tracking is formed on a glass substrate 1 and, for example, a ZnO film 3 is formed thereon. The ZnO film 3 has a high m.p., is nearly transparent and is small in crystal size and is, therefore, optimum as the polycrystal film. The optical recording film 4 is deposited by evaporation on the ZnO film 3 and finally a protective film 5 is provided thereon. The information is recorded by irradiation of high-power laser light, etc., on the crystallized recording film 4. The irradiated part is then made into the amorphous or poor crystalline part. The original crystalline state is restored if the information is erased by the irradiation of the low-power laser light, etc. If the polycrystal film 3 exists in contact with the recording film 4 at this time, the irradiated part is more easily crystallized by receiving the influence thereof. Since the time for the crystallization is thereby shortened, the higher information transfer rate is obtd. |
