Optical storage system, optical storage medium and use of...

G - Physics – 11 – B

Patent

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G11B 7/24 (2006.01) G11B 7/254 (2006.01)

Patent

CA 2469083

A description is given of an optical storage system comprising an optical storage medium (1) and an optical head device (6). The medium has a substrate (2), a recording stack (3) and an optically transparent protective coating stack (4 and 5), for protecting the recording stack from impact by the optical head device (6). The protective coating stack comprises a multi-layer (4 and 5) of at least: a first layer (5) with a thickness smaller than 40 nm and a surface with a surface energy smaller than 1.5 J/m2, and a second layer (4), adjacent the first layer (5), with a Young's modulus E smaller than 10 GPa and larger than 0,001 GPa. This combination of layers (4 and 5) is very resistant to damage caused by mechanical impact of the optical head device (6). No lubricants are required.

L'invention concerne un système de stockage optique comprenant un support de stockage optique (1) et un dispositif de tête optique (6). Le support comporte un substrat (2), une pile d'enregistrement (3) et une pile de revêtement protectrice (4, 5) optiquement transparente, destinée à protéger la pile d'enregistrement contre un choc avec le dispositif de tête optique (6). Cette pile de revêtement protectrice comprend une structure à couches multiples (4, 5) constituée au moins: d'une première couche (5) d'épaisseur inférieure à 40 nm, dont la surface présente une énergie de surface inférieure à 1,5 J/m?2¿, et d'une deuxième couche (4), adjacente à la première (5), présentant un module d'Young E inférieur à 10 GPa et supérieur à 0,001 GPa. Cette combinaison de couches (4 et 5) est très résistante aux dommages provoqués par un choc mécanique avec le dispositif de tête optique (6). Le système selon l'invention ne nécessite pas de lubrifiant.

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