Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-11-08
2009-12-22
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044410
Reexamination Certificate
active
07636285
ABSTRACT:
Reflected light caused by reflection of a laser beam at a first layer of an optical disc is converted into a main signal. Reflected light caused by reflection of the laser beam at a second layer of the optical disc is converted into a sub signal. An address of a currently-accessed position in the first layer is detected from the main signal. A reference address in the first layer corresponds to a boundary between a signal recorded area and a signal unrecorded area in the second layer. A specified address in the first layer corresponds to a position radially separated from the position at the reference address by an allowable range. A misalignment between tracks on the first and second layers is concluded to be within the allowable range in cases where the sub signal substantially takes a reference level when the detected address reaches the specified address.
REFERENCES:
patent: 7400565 (2008-07-01), Sasaki
patent: 2006/0098546 (2006-05-01), Ogawa et al.
patent: 2009/0092026 (2009-04-01), Watanabe et al.
patent: 10-293926 (1998-11-01), None
patent: 11-203692 (1999-07-01), None
Feild Joseph H
Haley Joseph
Victor Company of Japan Ltd.
Woo Louis
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