Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-05-02
2006-05-02
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S047280
Reexamination Certificate
active
07038987
ABSTRACT:
It is a subject to provide an optical disc device which can speedily control generation of a data sync clock, when the position of data reading by an optical pickup shifts between a data unrecorded area and a data recorded area.An optical disc device comprises a first wobble cycle counter702for counting the cycle of a wobble reference signal S104that is synchronized with a wobble signal S101obtained from an optical disc, with a constant cycle clock S102; a second wobble cycle counter703for counting the cycle of the wobble reference signal S104with a data sync clock S103; a count value comparator704for obtaining a difference between a count value outputted from the first wobble cycle counter702and a count value outputted from the second wobble cycle counter703; and a comparison result judgement unit710for judging whether or not the value of a count value comparison result that is output from the count value comparator704is within a range of preset values. Therefore, when a position where information is read by an optical pickup shifts between a data unrecorded area and a data recorded data, generation of the data sync clock can be speedily controlled.
REFERENCES:
patent: 6104682 (2000-08-01), Konishi
patent: 6683830 (2004-01-01), Eom
patent: 6757239 (2004-06-01), Minamino et al.
patent: 11-16295 (1999-01-01), None
Huber Paul W.
Steptoe & Johnson LLP
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