Tilt servo circuit for an optical disc playback device

Details Tilt servo circuit for an optical disc playback device Tilt servo circuit for an optical disc playback device

1989-02-01

1991-03-19

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

050016903

ABSTRACT:
A tilt servo circuit for controlling an optical axis of an optical pickup perpendicularly to the surface of an optical disc such as a Laser Vision Disc or a Compact Disc playbed back by an optical disc playback device comprises a RF level detection circuit for detecting level of an RF reproduced signal from an optical pickup, a tilt changing circuit for changing a tilt angle of the optical pickup, and a tilt servo control circuit for controlling the tilt changing circuit so as to bring the RF level to maximum or substantially maximum. The level of the RF reproduced signal varies with inclination of laser beam with respect to the perpendicular direction to the disc surface, namely the RF level is at the maximum when the inclination is zero and it decreases as the inclination increases. By detecting the RF level and controlling the tilt changing circuit in a manner to bring the RF level to the maximum, the inclination of the optical axis of the laser beam can be corrected.

REFERENCES:
patent: 4689779 (1987-08-01), Hayashi et al.
patent: 4703468 (1987-10-01), Baba et al.

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