Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2007-07-03
2007-07-03
Wellington, Andrea (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S053340
Reexamination Certificate
active
09590221
ABSTRACT:
A recording and reproducing apparatus of the present invention includes a photo-detector having light receiving sections divided along the track direction of an optical disk. The apparatus also includes a wobble signal processing circuit for generating a wobbling polarity judging signal used in judging a wobbling polarity of a track being tracked by comparing phases of a first wobble signal detected from a difference signal of the outputs of the light receiving sections and a second wobble signal detected from a sum signal of the outputs of the light receiving signals. Consequently, whether the wobbled side wall of the track being tracked is the inner or outer radius of track can be judged in real time by a simple structure using one laser beam.
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Chu Kim-Kwok
Conlin David G.
Edwards Angell Palmer & & Dodge LLP
Manus Peter J.
Sharp Kabushiki Kaisha
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