Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-01-15
1999-09-28
Huber, Paul W.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 360 7704, G11B 700, G11B 5596
Patent
active
059599529
ABSTRACT:
A track-follow control device uses a positional error signal representing the positional error between a target track on a recording medium and a head for recording information to or reproducing information from the recording medium. The track-follow control device controls an actuator to follow the target track by means of a signal from a sub-controller for outputting a correction signal by using its gain circuit for performing gain correction in accordance with an output result from a main-controller for outputting a positioning control signal to the actuator and a band-pass filter for allowing the passage of a predetermined frequency of the positional error signal. The sub-controller extracts only an eccentric frequency, which prevents the correction signal from breaking.
REFERENCES:
patent: 5121374 (1992-06-01), Barton et al.
patent: 5539714 (1996-07-01), Andrews, Jr. et al.
patent: 5742573 (1998-04-01), Hajjar et al.
Alps Electric Co. ,Ltd.
Huber Paul W.
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