Patent ID: 8075974
Filing Date: 2011-12-13
Classification: G11B,Y10T

Abstract:
1. An optical recording medium comprising: a first protective layer, a recording layer, a second protective layer, and a reflective layer formed in this order as viewed from the side of laser beam irradiation for recording and reproducing wherein, the recording layer comprises a phase-change material represented by any one of the following Composition Formula (1-1), Composition Formula (1-2), and Composition Formula (1-3); and the second protective layer comprises at least one selected from a material represented by the following Composition Formula (2), and a material represented by the following Composition Formula (3), where X1 is at least one selected from Ge, Te, Zn, and Mn; α1, β1, and γ1 respectively represent an atomic ratio, where 0.10≦α1≦0.25, 0.65≦β1≦0.80, and 0.04≦γ1≦0.15, where X2 is at least one selected from Te, Zn, Mn, and In; α2, β2, γ2, δ2, and ∈2 respectively represent an atomic ratio, where 0.04≦α2≦0.09, 0.56≦β2≦0.79, 0.05≦γ2≦0.30, 0.03≦δ2≦0.19, and 0≦∈2≦0.09, where X3 is at least one selected from Te, In, Zn, and Bi; α3, β3, γ3, δ3, and ∈3 respectively represent an atomic ratio, where 0.04≦α3≦0.09, 0.56≦β3≦0.79, 0.05≦γ3≦0.29, 0.03≦δ3≦0.23, and 0≦∈3≦0.09, where Y is at least one selected from Mn, Ge, and Ti; α4 and β4 respectively represent a percent by mass, where 0.5≦α4≦10.0, and 0≦β4≦25.0, where Z represents any one of an Mn oxide, a Ge oxide, a Ti oxide, and a mixture thereof; α5 and β5 respectively represent a percent by mass, where 0.5≦α5≦10.0, and 0≦β5≦30.0.