| 摘要 |
PURPOSE:To restrain a record thin film material from moving along a guide groove even if pulsation of a protective layer occurs due to repetition of recording and erasion so as to improve repeating property by making nitrogen contained in the record thin film. CONSTITUTION:A disk base plate 1 constituted of transparent resin has an optical record medium arranged on the surface thereof. The optical record medium is made of a first dielectric layer 2, a record thin film 3, a nitride layer 4, a second dielectric layer 5 constituted of the same material as the first dielectric layer 2, and a reflecting layer 6. The record thin film 3 of a disk in a rotating state is irradiated with laser beam so as to make the temperature up to the melting point or more and to melt it. Thereafter, it is cooled gradually and initialized, so that the nitride layer 4 arranged adjacently to the record thin film 3 also melts at the same time. Therefore, it is mixed to the record thin film 3 in a melting state, so that the nitrogen will be incorporated into the record thin film 3. As a result, the quality of the record thin film 3 changes, so that a moving phenomenon of the record film material along a guide groove due to pulsation of a protective film can be restrained. |
