Rewritable optical information recording medium
AssigneeKoninklijke Philips Electronics N.V.
InventorGuo-Fu Zhou
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Abstract
A description is given of a rewritable optical information medium comprises a substrate (1), a first dielectric layer (2), a phase-change recording layer on the basis of AgaInbSbcTed or GeaInbSbcTed (3), a second dielectric layer (4), and a metal mirror layer (5), wherein 2<a<8 0<b<6 55<c<80 15<d<30; a+b+c+d=100, and wherein the layer thickness of said recording layer (3) ranges between 5 and 15 nm. Such a medium is suitable for use in high density and high data rate phase change optical recording systems and media such as DVD+RW, DVR-red and -blue.
Claims4
An optical information recording medium for rewritable high-speed recording by means of a laser-light beam, said medium comprising a substrate carrying a stack of layers, which stack comprises, in this order, a first dielectric layer, a recording layer comprising a phase-change recording material comprising Sb and Te, a second dielectric layer and a metal mirror layer, characterized in that the recording material consists of a composition defined by the formula
- Gea Inb Sbc Ted (in atomic percentages), wherein
- 2<a<8
- 0<b<6
- 55<c<80
- 15<d<30;
- a+b+c+d=100, and
- the recording layer having a thickness of 5 to 15 nm.
Dependencies are inferred from the claim text.