Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2008-07-01
2008-07-01
Dinh, Tan (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
Reexamination Certificate
active
10936746
ABSTRACT:
The present invention relates to a skew control method and a skew control unit by which stable skew control can be performed with a simple configuration without the need for a dedicated skew sensor.Focus drive voltages V1and V2are measured at a plurality of points P1and P2set by moving an optical pick-up31in the radial direction of an optical disc2in a state where a focus servo of the optical pick-up31is ON, and skew angle control is performed so that V1and V2are equal to each other.
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Maeda Yasuaki
Shigenobu Masahiro
Dinh Tan
Gupta Parul
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
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