JP2006247855A5 - - Google Patents

Claims (6)

A plurality of information layers including a phase change recording layer capable of recording information by causing a phase change by laser light irradiation, each information layer other than the innermost side when viewed from the side irradiated with laser light, It is composed of at least a lower protective layer, a phase change recording layer, an upper protective layer, a reflective layer, and a thermal diffusion layer, and the composition of the phase change recording layer is InαSbβGeγ (α, β, γ are atomic% , α + β + γ = 100 ) A multilayer phase change optical recording medium characterized by satisfying the following requirements:
10 ≦ α ≦ 20
65 ≦ β ≦ 85
2 ≦ γ ≦ 20   The reflective layer other than the innermost side when viewed from the side irradiated with the laser beam is Cu, or at least one metal element of Mo, Ta, Nb, Cr, Zr, Ni, and Ge with respect to Cu. 2. The multilayer phase change optical recording medium according to claim 1, comprising a material added in an amount of 0.6 to 2.0% by weight.   3. The multilayer phase change optical recording medium according to claim 1, wherein the upper protective layer other than the innermost side when viewed from the side irradiated with the laser beam contains an oxide of Sn.   4. The multilayer phase change optical recording medium according to claim 1, wherein the heat diffusion layer contains an oxide of In.   5. The multilayer phase change optical recording medium according to claim 4, wherein Zn oxide is mixed in the thermal diffusion layer.   5. The multilayer phase change optical recording medium according to claim 4, wherein an Sn oxide is mixed in the thermal diffusion layer.