G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/007 (2006.01) G11B 7/0037 (2006.01) G11B 27/19 (2006.01) G11B 27/24 (2006.01) G11B 27/30 (2006.01)
Patent
CA 2328026
The objective of the present invention is to facilitate to identify whether or not the optical disc is a optical disc of which recording capacity is enlarged. A synchronization pattern of ATIP information embedded into guide grooves irradiated with a light spot is made to be different between a high density optical disc and a standard density optical disc of which recording capacity is not enlarged. Specifically, while the synchronization pattern of the standard density optical disc is made into "3T+1T+1T+3T" (where "T" represents a minimum channel bit of a signal obtained by reading a positional information), the synchronization pattern of the high density optical disc is made into "3T+3T+1T+1T" for example. By reading the ATIP information and recognizing the synchronization pattern thereof, it can be easily and quickly identified whether the optical disc has a standard density or a high density.
Kawashima Tetsuji
Shishido Yukio
Gowling Lafleur Henderson Llp
Sony Corporation
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