Multilayer phase-change optical storage medium
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United States of America Patent
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Issued Date -
Apr 10, 2008
app pub date -
Sep 25, 2007
filing date -
Oct 5, 2006
priority date (Note) -
Abandoned
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Abstract
An optical storage medium has a substrate having a first surface and an opposite second surface, light being incident via the first surface in recording or reproduction and at least two composite layers formed on the second surface of the substrate, each composite layer having at least a recording film. At least one composite layer, except a composite layer farther or farthest from the first surface of the substrate, has at least a first protective film, an interface film, a semi-transparent recording film, a second protective film, a third protective film, and a semi-transparent reflective film formed in order when viewed from the substrate, the semi-transparent reflective film having a thickness below 10 nm, the first protective film, the interface film, the second protective film, and the third protective film having a relation .sigma.2>.sigma.k>.sigma.1.gtoreq..sigma.3 in which .sigma.1, .sigma.k, .sigma.2, and .sigma.3 denote thermal conductivity of the first protective film, the interface film, the second protective film, and the third protective film, respectively.
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