Patent ID: 6232035
Filing Date: 2001-05-15
Classification: G11B,Y10S

Abstract:
An information storage medium comprising:a substrate;a thin film formed on the substrate and having a reflectance changed by a phase change caused by irradiation of an energy beam irradiated via the substrate;a first reflective layer and a second reflective layer on the thin film directly, or via an intermediate layer;said thin film including one of In.sub.3 SbTe.sub.2, In.sub.35 Sb.sub.32 Te.sub.33, In.sub.31 Sb.sub.26 Te.sub.43, and Ag--In--Sb--Te;said first reflective layer and said second reflective layer being piled up in recited order from the thin film side, the first reflective layer comprising a material having an attenuation factor k of 2 or less and selected from the group consisting of Si--Ge, Si--Au, Si--Ag, Si--Cu, Si--Al, Si--Ni, Si--Fe, Si--Co, Si--Cr, Si--Ti, Si--Pd, Si--Pt, Si--W, Si--Ta, Si--Mo, Si--Sb, Si--Bi, Si--Dy, Si--Cd, Si--Mn, Si--Mg, Si--V, Si--Zn, Si--Ga, Si--Tl, Si--Pb, Si--B, Si--S, Si--Sn, Si--In or a mixture of Si--S and Si--In, and the second reflective layer comprising a material having an attenuation factor k of at least 3.