Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

2005-07-26

2005-07-26

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053320, C369S047180

Reexamination Certificate

active

06922381

ABSTRACT:
An optical disk apparatus capable of suppressing displacement of a servo system from a track even when a track defect is caused on an optical disk and achieving appropriate data recording and reproduction. In the case where any track defect is detected on an optical disk, a pulse width modulation signal, rather than a tracking servo signal created based on a tracking error signal, is used as a servo signal to drive an optical pick-up. The pulse width modulation signal is modulated such that its DC level becomes identical to a DC level of a tracking servo signal obtained immediately before detection of the track defect.

REFERENCES:
patent: 4769706 (1988-09-01), Kaizaki
patent: 6510112 (2003-01-01), Sakamoto et al.
patent: 57-149311 (1984-03-01), None
patent: 63061562 (1988-03-01), None
patent: 3034610 (1991-02-01), None
patent: 8180425 (1996-07-01), None

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