Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-08-01
1999-04-20
Edun, Muhammad N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4434, 369 4428, G11B 709
Patent
active
058963537
ABSTRACT:
A position control apparatus 100 is provided with: an optical pickup 1 for reading information from a track formed on a optical disk DK by irradiating a light beam B to the track, detecting a quantity of a shift between a position of the light spot and a position of the track on the basis of the read information, and generating a tracking error signal; a sampling device 26 for sampling a low frequency component from the tracking error signal; an average calculating device 25 for calculating an average of an amplitude of the sampled low frequency component during a period of one rotation of the optical disk DK; a comparator 27 for comparing the calculated average with a predetermined value and generating a drive timing signal; a carriage driver 28 for generating a drive control signal on the basis of the drive timing signal; and a carriage servo motor 8 for moving the optical pickup 1 in a radial direction of the optical disk DK on the basis of the drive control signal.
REFERENCES:
patent: 4855983 (1989-08-01), Arai
patent: 5590103 (1996-12-01), Noda
Edun Muhammad N.
Pioneer Electronic Corporation
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