Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2010-10-28
2011-12-13
Bibbins, Latanya (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044280, C369S044270, C369S044250, C369S053230
Reexamination Certificate
active
08077574
ABSTRACT:
An optical drive includes: an optical pickup; a preprocessing circuit which processes an optical signal detected by the optical pickup; nonvolatile memory having stored therein relation information which represents the relation of a signal balance with respect to a signal difference between a TE signal and an FE signal at the time of a predetermined operation of the optical pickup; and a central processing circuit which performs focus control of the optical pickup. The preprocessing circuit generates the signal balance of the optical pickup. The preprocessing circuit also obtains the FE signal and the TE signal with respect to the optical disc. The central processing circuit derives a phase difference and an amplitude difference from the signal balance and the relation information, and calculates, based on the differences and the TE signal, a FE signal suitable for the predetermined operation.
REFERENCES:
patent: 5850081 (1998-12-01), Yanagisawa
patent: 7839733 (2010-11-01), Nakai
patent: 2009/0028021 (2009-01-01), Yin et al.
patent: 2001-222827 (2001-08-01), None
Kawano Kenji
Yajima Masatoshi
Bibbins Latanya
Judge Patent Associates
Panasonic Corporation
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