| 摘要 |
PURPOSE:To enable fast erasing of records in a phase-transition type recording medium by providing crystallized thin films having higher m.p. than that of a recording layer on one or both sides of the recording layer and thereby raising the crystallization rate of the recording layer. CONSTITUTION:The recording layer 2 and the crystallized thin film 3 are successively deposited on a substrate 1. Crystals in the crystallized film 3 give seeds of crystallization of the recording layer 2 in the interface of the recording layer and the crystallized film 3 and promote generation of crystal seeds. Since the crystallized film 3 has higher m.p. than that of the recording layer 2, it does not melt or change into an amorphous state by irradiation of laser light. Thereby, the crystallization rate of the recording layer 2 becomes fast, so that records can be erased fast. The same effect can be obtained by providing the crystallized films 3 on the both sides of the layer 2. |
