Tracking control apparatus for correcting tracking error signal

Details Tracking control apparatus for correcting tracking error signal Tracking control apparatus for correcting tracking error signal

1992-11-23

1994-08-30

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4429, 369 4435, G11B 700

Patent

active

053434544

ABSTRACT:
In a tracking control apparatus, a tracking error signal having a level of a positional shift of a beam of light projected through an optical head onto a recording medium is detected based on a reflected light from the recording medium, and the optical head is controlled so that a beam of light scans on the track to be recorded or reproduced based on the tracking error signal. Offset values of the tracking error signal on adjustment tracks which are predetermined among a plurality of tracks of the recording medium are detected, and then coefficients of a predetermined approximate equation approximately representing an offset value characteristic on the track based on the detected offset values are calculated. Further, an offset value corresponding to the track to be recorded or reproduced is calculated based on the first approximate equation with the calculated coefficients, and an offset value of the tracking error signal is corrected based on the calculated offset value.

REFERENCES:
patent: 4205338 (1980-05-01), Schaefer
patent: 4807210 (1989-02-01), Kaku et al.
patent: 5048002 (1991-09-01), Horie et al.
patent: 5050151 (1991-09-01), Kurz

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