Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-12-05
2006-12-05
Wellington, Andrea (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044250, C369S044270
Reexamination Certificate
active
07145854
ABSTRACT:
An objective lens of an optical pickup is made to move from far position to near position with respect to DVD with constant speed, and a timer counts time taken for the movement of a focus of a laser beam between recording layers of the DVD on the basis of a focus error signal obtained from this movement. In the case of the DVD of the single-layer, since the recording layer is one-layer, and there is no interlayer, count value becomes small value. While, in the case of DVD of the multi-layer, the recording layer consists of a plurality of layers, thus one or plural-interlayer exists, therefore, count value becomes large value. Accordingly, if small count value is obtained, its DVD is discriminated as DVD of the single-layer. While, if large count value is obtained, its DVD is discriminated as DVD of the multi-layer.
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English Translation of: JP 11149640 A; JP 10188457 A; JP 11191264 A; JP 11353787 A; 2000011387 A.
Katten Muchin & Rosenman LLP
Ortiz-Criado Jorge L.
Sony Computer Entertainment Inc.
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