Apparatus for recording and reproducing information on an optica

Details Apparatus for recording and reproducing information on an optica Apparatus for recording and reproducing information on an optica

1988-03-21

1991-03-26

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44350, 369 44270, G11B 700

Patent

active

050035231

ABSTRACT:
An optical disk recording and reproducing appartus is provided with a signal processing circuit in a focus servo circuit for suppressing a traverse signal which has a frequency determined by the pitch of pre-grooves and the transversely shifting speed of a laser beam spot and which modulates a focus error signal during a search mode operation. This signal processing circuit successfully avoids an influence of the traverse signal focus servo system and thus assures accurate focus on the control.

REFERENCES:
patent: 4633453 (1986-12-01), Ogawa
patent: 4651314 (1987-03-01), Yoshikawa et al.
patent: 4658391 (1987-04-01), Nozu et al.
patent: 4722079 (1988-01-01), Matsumoti
patent: 4730294 (1988-03-01), Fuenada
patent: 4736354 (1988-04-01), Yoshio
patent: 4769801 (1988-09-01), Funada et al.

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