Optical recording medium

Details Optical recording medium Optical recording medium

2006-05-25

2009-02-03

Mulvaney, Elizabeth (Department: 1794)

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

C428S064500, C430S270130

Reexamination Certificate

active

07485357

ABSTRACT:
An optical recording medium including: a substrate having translucency; a first protective layer thereon; a recording layer composed of a phase-change material; a second protective layer; and a reflective layer, wherein laser beam irradiation causes phase-change of the recording layer between a crystalline phase and an amorphous phase thereby at least one of to rewrite and to record information, wherein the phase-change material comprises Ga, Sb and Sn, Ga content, Sb content, and Sn content satisfy the following formula, and the total content of Ga, Sb and Sn is at least 80 atomic % of the entire phase-change material:in-line-formulae description="In-line Formulae" end="lead"?GaαSbβSnγ(where, α+β+γ=100 atomic %),in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?where 20≦−2.75α+0.708β+1.18γ−7.56≦43,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?and α/(α+β)≦0.12.in-line-formulae description="In-line Formulae" end="tail"?

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Gravesteijn, D.J., et al., Phase-change optical data storage in GaSb, Applied Optics vol. 26, No. 22115, Nov. 15, 1987, pp. 4772-4776.

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