Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-07-09
1998-06-16
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 1900
Patent
active
057682313
ABSTRACT:
It is an object to provide an optical disk driving method and apparatus with the consumption power reduced. The optical disk driving apparatus includes a synchronizing clock generator 6 for generating a clock in synchronism with a reproduced signal, a synchronized state discriminator 17 for deciding if the frequency of the reproduced signal is within a synchronized range, and a spindle controller 18a for controlling the spindle to be stopped from being driven and thus left running by inertia when the frequency of the reproduced signal is decided to be within the synchronized range, but controlling the spindle to be driven so that the frequency of the reproduced signal can be pulled in the synchronized range immediately before the frequency of the reproduced signal goes out of the synchronized range. A spindle controller 18b in another example of the invention, when the frequency of the reproduced signal is decided to be out of an allowable synchronized range, controls the spindle motor 2 to be driven by the driving output with its peak-to-peak value and driving time changed in accordance with the current revolution rate so that the frequency of the reproduced signal can be pulled in the allowable synchronized range.
REFERENCES:
patent: 5502700 (1996-03-01), Shinada
Japanese Document 406076468A (Abstract Only) Mar. 1994.
Japanese Document 401069278A (Abstract Only), Mar. 1989.
Japanese Document 362266734A (Abstract Only), Nov. 1987.
Matsushita Electric - Industrial Co., Ltd.
Tran Thang V.
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