| 摘要 |
PURPOSE:To provide a phase change type optical recording medium whose optical constant undergoes a very considerable change when irradiated with laser beams. CONSTITUTION:This optical recording medium consists preferably of a substrate 1, heat resistant protective layers 2, 4, a recording layer 3 and a heat radiating reflecting layer 5 and the compsn. of the recording layer 3 is represented by a general formula Agalpha.Gabeta.Segamma.Mdelta (where 18<=alpha<=31, 16<=beta<=35, 33<=gamma<=65, 1<=delta<=13, alpha+beta+gamma+delta=100 and M is at least one kind of element selected from among Co, Ni, Cu, Zn, Sn, Pb, Sb, In, Ge and Si). |
