Tracking servo signal generating device for an optical disc

Details Tracking servo signal generating device for an optical disc Tracking servo signal generating device for an optical disc

1987-01-13

1989-10-17

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, G11B 700

Patent

active

048752037

ABSTRACT:
An optical disk reproducing apparatus of the type in which a tracking control is performed by projecting a controlling laser beam to the center of each of a plurality of V grooves formed on an optical disk and using far-field images of light beams reflected from the optical disk and the signals recorded on the adjacent slopes of the V groove are read by respectively projecting two reproducing laser beams to the slopes. To remove the low-frequency components of the signals on the slopes entering a tracking error signal, the low-frequency components are extracted from the two reproduced signals by low-pass filters and the difference therebetween is generated as a correction signal which in turn is subtracted from the tracking error signal, thereby improving the accuracy of the tracking control.

REFERENCES:
patent: 4506149 (1985-03-01), Utsumi
patent: 4544838 (1985-10-01), Musha et al.
patent: 4562565 (1985-12-01), Tamura
patent: 4698795 (1987-10-01), Yoshio
patent: 4774698 (1988-09-01), Henmi et al.

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