Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-05-02
2006-05-02
Edun, Muhammad (Department: 2655)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053200, C369S047550, C369S053440, C369S044270
Reexamination Certificate
active
07038986
ABSTRACT:
A disc discrimination method and apparatus include calculating a first time difference between a time when a first focusing signal is detected from a first recording area of a first disc and a time when a first reflection signal is detected from a first surface area of the first disc, and calculating a second time difference between a time when a second focusing signal is detected from a second recording area of a second disc and a time when a second reflection signal is detected from a second surface area of the second disc. An average value of the first and the second time differences is calculated and the average value obtained as a reference time is determined and a disc type of the first disc or the second disc loaded into the optical disc system is identified using the average value.
REFERENCES:
patent: 5757745 (1998-05-01), Takeya
patent: 6058082 (2000-05-01), Hwang
patent: 6449232 (2002-09-01), Kuwahara et al.
patent: 2002/0181370 (2002-12-01), Yamanoi et al.
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