Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2007-03-20
2007-03-20
Wellington, Andrea (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053230, C369S044270
Reexamination Certificate
active
10273383
ABSTRACT:
An objective lens of an optical pick-up is ascended from the disc Far position towards the disc Near position at a constant velocity, and a peak bottom detector detects levels between the peak to the bottom (peak-to-bottom levels) of focus error signals obtained during the focus movement. A servo processing microcomputer counts the number of focus error signals having a peak-to-bottom level not smaller than the predetermined minimum level, out of all peak-to-bottom levels obtained during the focus movement across the recording layer of a disc, and defines the count value as the number of the recording layers of the disc. This allows correct determination of the number of recording layers of recording medium while not being affected by variation in property of the instruments, variation in reflectivity of recording medium, variation in the ambient temperature and fake pulse corresponded to waviness in focus error signal.
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Battaglia Michael V.
Katten Muchin & Rosenman LLP
Sony Computer Entertainment Inc.
Wellington Andrea
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