Phase-change optical storage medium
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United States of America Patent
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Issued Date -
Nov 22, 2007
app pub date -
Apr 25, 2007
filing date -
May 17, 2006
priority date (Note) -
Abandoned
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Abstract
An optical storage medium has a substrate having a first surface and a second surface on both sides, the first surface allowing light to pass therethrough in recording or reproduction. The medium also has at least one composite layer having at least a first protective film, a second protective film and a recording film formed in order on the second surface, the first and second protective films exhibiting refractive indices n1 and n2, respectively, having the following relations therebetween, to the light having a specific wavelength .lamda.: n1>n2, n1-n2.gtoreq.0.02 and 2.1.ltoreq.n1.ltoreq.2.5, 1.5.ltoreq.n2.ltoreq.2.1. The composite layer may have at least a first protective film, a second protective film, a third protective film and a recording film formed in order on the second surface, the first, second and third protective films exhibiting refractive indices n21, n22 and n23, respectively, having a relation n21>n22>n23 or n22>n21>n23 thereamong, to the light having a specific wavelength .lamda..
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