Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-09-12
1999-10-19
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, G11B 709
Patent
active
059700335
ABSTRACT:
A tracking control unit for an optical disk drive comprises a TES detection circuit for detecting a tracking error signal (TES) in an output of a photodetector included in a stationary optical system, a frictional state prediction circuit for predicting a frictional state between guide shafts and a carriage on the basis of the TES detected by the TES detection circuit, a phase compensation filter for compensating for a phase difference of the TES detected by the TES detection circuit so as to stabilize a tracking control system on the basis of the result of the prediction performed by the frictional state prediction circuit, and a driver for moving the carriage in a direction in which a tracking error can be corrected for according to an output of the phase compensation filter and for thus controlling tracking.
REFERENCES:
patent: 5581521 (1996-12-01), Nomura et al.
patent: 5610885 (1997-03-01), Takahashi
patent: 5633846 (1997-05-01), Okuyama et al.
patent: 5757747 (1998-05-01), Shimada
patent: 5872439 (1999-02-01), Nomura
Hokkezu Takeru
Nakano Jun-ichi
Olympus Optical Co,. Ltd.
Tran Thang V.
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