Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2006-08-15
2006-08-15
Tran, Thang V. (Department: 2653)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S275300
Reexamination Certificate
active
07092351
ABSTRACT:
The present invention provides an optical recording medium, in which levels of wobble signals extracted from a recording area formed snakily, a reproduction exclusive area and an impossible area are maintained constant. On DVD-RW, groove tracks are snakily formed on a groove section on which recording information is recorded, and pit strings where a plurality of phase pits wave are arranged on the impossible area and the reproduction exclusive area which prevent illegal copying. On the respective areas, pit depths (groove depths), duty of the pit strings and wobbling amplitudes are set according to predetermined conditions so that the output levels of the wobble signals extracted based on the wobbling amplitudes can be maintained constant on the respective areas. As a result, synchronous control can be made accurately at the time of recording and reproduction on/from the DVD-RW.
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“Pioneer Introduces the Industry's First DVD Recorder,” XP-002215139. (Press Released, Nov. 25, 1999).
Kato Masahiro
Muramatsu Eiji
Oshima Seiro
Tagiri Takao
Yamaguchi Atsushi
Drinker Biddle & Reath LLP
Pioneer Corporation
Tran Thang V.
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