Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2006-02-14
2006-02-14
Tran, Thang V. (Department: 2653)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S111000
Reexamination Certificate
active
06999405
ABSTRACT:
An optical recording medium used as a recording medium for information signals in which, in forming a groove along a recording track, a first groove and a second groove are formed to a first depth x to describe a double helix and a third groove having a second depth y shallower than the first depth x is formed between the first and second groves describing double helices. By setting the phase depths of these grooves to a pre-set range, signals required for tracking servo or seek are obtained to sufficient levels to realize stable tracking servo and seek.
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Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
Tran Thang V.
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