Optical disc having focus offset area

Details Optical disc having focus offset area Optical disc having focus offset area

G - Physics

11

B

G11B 7/007 (2006.01) G11B 7/24 (2006.01)

Patent

CA 2541784

A record carrier is for recording information by writing marks in a track on a recording layer. The shortest mark used for recording the information has a length of a predefined minimum number d of channel bit lengths. The record carrier (11) has a pregroove that is modulated by a carrier pattern containing focus marks (18,19) that provides a focus area (12) at a predefined location on the recording layer. The focus marks have lengths of at least two times the length of the shortest mark for being substantially longer than the effective diameter of the scanning spot. A scanning device locates the focus area and determines the best focus offset by detecting the maximum read signal amplitude while scanning the carrier pattern.

L'invention concerne un support d'enregistrement permettant d'enregistrer des informations par le biais de l'écriture de repères dans une piste sur une couche support d'information. La longueur du repère le plus court utilisé pour enregistrer les informations équivaut à un nombre minimum prédéfini d de longueurs de bits de canal. Le support d'enregistrement (11) comprend une pré-spirale modulée par un motif de support contenant des repères de focalisation (18, 19) définissant une zone de focalisation (12) en un point prédéfini de la couche support d'information. Ces repères de focalisation sont au moins deux fois plus longs que le repère le plus court afin d'être sensiblement plus longs que le diamètre effectif du spot d'exploration. Un dispositif d'exploration localise la zone de focalisation et détermine le meilleur décalage de focalisation en détectant l'amplitude maximale du signal de lecture lors de l'exploration du motif du support.

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