Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-02-14
2008-07-01
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S124150, C369S124090
Reexamination Certificate
active
07394748
ABSTRACT:
An optical disk recording apparatus includes a first comparator, a second comparator, a third comparator, a selection circuit, a control voltage generator, a voltage control oscillator, and a control circuit. The first comparator compares frequency-divided signals to output an error signal. The second and third comparators compare a signal pre-recorded on an optical disk and the frequency-divided signal to output an error signal and a frequency differential signal. The selection circuit selects any one of the error signals to output the signal selected. The control voltage generator generates a control voltage from the signal from the selection circuit. The voltage control oscillator generates and outputs the write reference clock signal having a frequency corresponding to the control voltage from the control voltage generator. The control circuit controls operations of the selection circuit according to the frequency differential signals.
REFERENCES:
patent: 5537379 (1996-07-01), Kimura et al.
patent: 6735159 (2004-05-01), Sugiyama
patent: 7023781 (2006-04-01), Tsuji
patent: 7151732 (2006-12-01), Tsuji
patent: 2000-173195 (2000-06-01), None
patent: 2001-6297 (2001-01-01), None
U.S. Appl. No. 09/934,661 to Tsuji, filed Sep. 13, 1999.
Sugiyama Ryohsuke
Tsuji Masaaki
Cooper & Dunham LLP
Hindi Nabil
Ricoh & Company, Ltd.
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