G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) G11B 7/243 (2006.01)
Patent
CA 2353587
A description is given of a rewritable optical information medium having a phase-change recording layer on the basis of an alloy of Ge-Sb-Te, which composition is situated within the pentagonal area ABCDE in a triangular ternary composition diagram. These alloys show a complete erase time (CET) of 50 ns or less. CET-values below 45 ns are obtained with alloys situated on the tie-line connecting Te and the compound Ge2Sb2Te5 within the area ABCDE. Such a medium is suitable for high speed recording (i.e. at least six times the CD- speed), such as DVD+RW, CD-RW, DVD-RAM and optical tape.
L'invention porte sur un support optique d'informations dont la couche d'enregistrement est à base d'un alliage de Ge-Sb-Te, sa composition étant située à l'intérieur de l'aire du pentagone ABCDE dans un diagramme triangulaire ternaire. Cet alliage présente un temps d'effaçage total (CET) de 50 ns ou moins. Des valeurs CET inférieures à 45 ns sont obtenue avec des alliages situés sur la ligne de liaison reliant Te aux composés Ge¿2?-Sb¿2?-Te¿5? dans l'aire ABCDE. Un tel support se prête aux supports d'enregistrement à grande vitesse (au moins 6 fois celle d'un CD) tels que les DVD+RW, CD-RW, DVD-RAM et les rubans optiques.
Jacobs Bernardus A. J.
Zhou Guo-Fu
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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