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 2519917

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 long marks (18,19) that provides a focus area (12) at a predefined location on the recording layer. The long 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.

Un support d'enregistrement est destiné à enregistrer des informations par le biais de l'inscription de marques dans une couche d'enregistrement. La longueur de la marque la plus courte utilisée pour enregistrer des informations équivaut à un nombre minimum prédéterminé d de longueurs de bits de canal. Le support d'enregistrement (11) comprend une pré-spirale modulée par un motif de support présentant des marques longues (18, 19) définissant une zone de focalisation (12) en un point prédéfini de la couche d'enregistrement. Ces longues marques sont au moins deux fois plus longues que la marque la plus courte, afin d'être sensiblement plus longues que le diamètre effectif du point de balayage. Un dispositif de balayage localise la zone de focalisation et détermine le meilleur décalage de focalisation en détectant l'amplitude de signal de lecture maximale lors du balayage du motif du support.

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