Multiple-layer optical disc and apparatus

G - Physics – 11 – B

Patent

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Details

G11B 7/007 (2006.01) G11B 7/0037 (2006.01) G11B 7/005 (2006.01) G11B 7/12 (2006.01) G11B 7/14 (2006.01) G11B 7/24 (2006.01) G11B 20/10 (2006.01) G11B 7/00 (2006.01)

Patent

CA 2200565

An optical data carrier has a pair of spiral tracks of opposite hand that may be read either sequentially or simultaneously. When read simultaneously, the information is recorded at a uniform spatial density and demodulated into a common data stream. The heads reading the tracks are equidistant from a median radius and move along the carrier at a constant radial rate to provide a substantially uniform combined data rate.

Un support de données optiques présente une paire de pistes hélicoïdales orientées dans des sens opposés qui peuvent être lues séquentiellement ou simultanément. Lorsqu'elles doivent être lues simultanément, les informations y sont enregistrées selon une densité spatiale uniforme et démodulées en un flux de données commun. Les têtes de lecture des pistes sont équidistantes par rapport à un rayon médian et se déplacent sur le support à une vitesse radiale constante afin de présenter une vitesse de lecture de données combinée pratiquement constante.

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