Optical data storage disc

Details Optical data storage disc Optical data storage disc

G - Physics

11

B

G11B 7/24 (2006.01) G11B 7/0065 (2006.01) G11B 7/26 (2006.01) G11B 23/38 (2006.01)

Patent

CA 2120740

An optical data storage disc, e.g. a compact disc, has one side formed with a pattern of indentations (11) defining a digital data recording, and this side is metallised (at 12) and further coated with a layer (14) which is embossed with a relief pattern (15) defining a holographic image. The hologram may extend across the whole surface of the disc and is visible from the top side of the disc, whilst the digital information is readable in the usual way using a laser directed at the underside of the disc.

Un disque optique de stockage de données, par exemple, un disque compact, comporte une face présentant un motif semblable à des créneaux (11) définissant un enregistrement de données numériques; cette face est métallisée (12) et également revêtue d'une couche (14) qui est travaillée en un motif en relief (15) formant une image holographique. L'hologramme peut traverser toute la surface du disque et se voit de la surface supérieure du disque, alors que les informations numériques sont lisibles de la manière habituelle au moyen d'un laser dirigé au niveau de la face inférieure du disque.

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