Multilayer optical disc having pregroove modulation

A record carrier is for recording information by writing marks in a track. The record carrier has at least a first recording layer ( 40 ) and a second recording layer ( 41 ). Each layer has a pregroove ( 14 ) indicating the position of the track and exhibiting a wobble modulated for representing phy...

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Bibliographic Details
Main Author WOERLEE PIERRE H.,KOPPERS WILHELMUS R.,MARTENS HUBERT C. F.,OETELAAR RONALD J. A. VAN DEN,SPRUIT JOHANNES H. M
Format Patent
LanguageEnglish
Published 26.04.2006
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Summary:A record carrier is for recording information by writing marks in a track. The record carrier has at least a first recording layer ( 40 ) and a second recording layer ( 41 ). Each layer has a pregroove ( 14 ) indicating the position of the track and exhibiting a wobble modulated for representing physical address information. In addition the pregroove has a pregroove modulation ( 13 ) consituted by variations of a physical parameter related to the shape of the pregroove for encoding axiliary control information. In a scanning device the pregroove modulation is detected in the main detector signal by variations of the reflected radiation.
Bibliography:Application Number: CN200480007841