OPTICAL INFORMATION RECORDING MEDIUM

摘要

PURPOSE:To provide the phase transition type optical disk having good repetitive characteristics of recording and erasing by providing a crystallization suppressing layer or crystallization accelerating layer in contact particularly with a recording thin film. CONSTITUTION:The crystallization suppressing layer 5 is provided in contact with the recording thin film 3. The contact area of the recording thin film 3 and the crystallization suppressing layer 5 per unit area of the boundary of the recording thin film 3 is so set as to increase from the outer peripheral side of the region where the recording thin film 3 is formed toward the inner peripheral side. The crystallization accelerating layer 10 is provided in contact with the recording thin film 3. The contact area of the recording thin film 3 and the crystallization accelerating layer 10 per unit area of the boundary of the recording thin film is so set as to increase from the inner peripheral side of the region where the recording thin film 3 is formed toward the outer peripheral side.