| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of a reproduction signal by forming a recording layer out of a mixture of an Sb-Te-Ge alloy and an oxide of TeO2 , GeO2 , Sb2 O3 and the like, in a phase transition type optical recording medium for recording and reproducing information by casting a light of a specific wavelength thereon. SOLUTION: A phase transition type optical recording medium for recording and reproducing information by casting a light of a wavelength 600 nm or below thereon is prepared by laminating one or more thin film layers including a recording layer 3 wherein phase transition between crystalline and amorphous states is caused by casting of the light thereon, on one surface side of a transparent base 1. On the occasion, the recording layer 3 is formed of a mixture of an Sb-Te-Ge alloy, and an oxide of at least one of TeO2 , GeO2 and Sb2 O3 and laminated on the base 1 with a first dielectric layer 2 interlaid. On this recording layer 3, a reflecting layer 5 constituted of an Al alloy is laminted with a second dielectric layer 4 interlaid and thereby a phase transition type optical recording medium of a four-layer stricture is prepared. |
