MULTILAYER OPTICAL DISC HAVING DISC INFORMATION

摘要

A MULTI-LAYER RECORD CARRIER IS FOR RECORDING INFORMATION BY WRITING MARKS IN A TRACK. THE RECORD CARRIER HAS A FIRST RECORDING LAYER (40) AND A SECOND RECORDING LAYER (41), AND EACH RECORDING LAYER HAS A PREGROOVE (14) INDICATING THE POSITION OF THE TRACK ACCORDING TO AN OPPOSITE TRACK PATH. THE PREGROOVE EXHIBITS A MODULATED WOBBLE FOR REPRESENTING CONTROL INFORMATION. A LEAD-IN PART OF THE PREGROOVE HAS FIRST CONTROL INFORMATION FOR THE FIRST RECORDING LAYER, AND THE LEAD-OUT PART ON THE SECOND RECORDING LAYER HAS SECOND CONTROL INFORMATION INCLUDING RECORDING PARAMETERS FOR THE SECOND RECORDING LAYER. THE DEVICE THE DEVICE HAS A HEAD (22) FOR PROVIDING THE BEAM AND WOBBLE DETECTION MEANS (32) FOR RETRIEVING CONTROL INFORMATION FROM EACH LAYER.