Information storage medium
AssigneeKabushiki Kaisha Toshiba
InventorKatsumi Suzuki
Life of this patent
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Abstract
An optical disk comprises a polycarbonate substrate, a first protective layer, formed on the substrate and made of SiO.sub.2, a recording layer, formed on the first protective layer and made of an In-Sb-Te alloy, a second protective layer, formed on the recording layer and made of SiO.sub.2, and a surface protective layer, formed on the second protective layer and made of an ultraviolet curable resin. The recording layer has a composition of In.sub.50-x Sb.sub.50 Te.sub.y Au.sub.Z wherein x, y, and z are in atomic %, x=y+z, y.gtoreq.2z, and 1.ltoreq.x.ltoreq.6), In.sub.50-x Sb.sub.50-x Te.sub.y Au.sub.z (wherein 2x=y+z and 0<x.ltoreq.10), or (In.sub.100-x Sb.sub.x).sub.100-y-z Te.sub.y Au.sub.z (wherein 48.ltoreq.x.ltoreq.52 and 0.05.ltoreq.y+z.ltoreq.5).
Claims15
An information storage medium comprising:
- a substrate;
- and
- a recording layer supported on said substrate and subjected to reversible phase transformation between different phases by changing conditions under which a light beam is radiated, said recording layer containing an In.sub.50-x Sb.sub.50 Te.sub.y Au.sub.z alloy (wherein x, y, and z are in atomic %, x=y+z, y .gtoreq.2z, and 1.ltoreq.x.ltoreq.6).
An information storage medium comprising:
- a substrate;
- and
- a recording layer supported on said substrate and subjected to reversible phase transformation between different phases by changing conditions under which a light beam is radiated, said recording layer containing an In.sub.50-x Sb.sub.50-x Te.sub.y Au.sub.z alloy (wherein x, y, and z are in atomic %, 2x=y+z, and 0<x.ltoreq.10).
An information storage medium comprising:
- a substrate;
- and
- a recording layer supported on said substrate and subjected to reversible phase transformation between different phases by changing conditions under which a light beam is radiated, said recording layer containing an (In.sub.100-x Sb.sub.x).sub.100-y-z Te.sub.y Au.sub.z alloy (wherein x, y, and z are in atomic % and 0.05.ltoreq.y+z.ltoreq.5).
Dependencies are inferred from the claim text.