Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-04-30
1998-02-03
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 369 4427, G11B 7085
Patent
active
057152187
ABSTRACT:
A pickup control method is used to control a pickup of a reproducing unit which reproduces information from a recording medium. The pickup control method includes the steps of (a) controlling a gain of a tracking error signal in a tracking servo system during a power save mode of the reproducing unit so that the gain is reduced in the power save mode in which the reproducing unit operates at a reduced power consumption compared to a normal operation mode, where the tracking servo system controls tracking of the pickup based on the tracking error signal so that the pickup follows a track on the recording medium, and (b) controlling a phase characteristic of a phase compensation means, provided in the tracking servo system, for compensating a phase of the tracking error signal so as to secure a phase margin at a zero-crossing point of the gain in an open loop characteristic of the tracking servo system during the power save mode.
REFERENCES:
patent: 5150345 (1992-09-01), Shikichi et al.
patent: 5532991 (1996-07-01), Sasaki
patent: 5612939 (1997-03-01), Ueki et al.
Fujitsu Limited
Tran Thang V.
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