Tilt servo system

Details Tilt servo system Tilt servo system

1997-12-05

1999-06-22

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369 58, 369112, G11B 7095

Patent

active

059149230

ABSTRACT:
A tilt servo system for performing a servo control in order to compensate an aberration caused by a tilt of an optical disc, having: a pickup for radiating a laser beam onto each track of the optical disc, the pickup having a laser light source for emitting the laser beam, an objective lens for converging the emitted laser beam on the optical disc, and a liquid crystal panel positioned on an optical axis of the emitted laser beam in order to compensate the aberration; a tilt sensor for detecting the tilt of the optical disc, and for outputting a detection signal corresponding to the tilt of the optical disc; a storage device for storing the detection signal corresponding to the tilt of an (N-.alpha.).sup.th track of the optical disc outputted from the tilt sensor; a controller for controlling the liquid crystal panel on the basis of the detection signal corresponding to the tilt of the (N-.alpha.).sup.th track of the optical disc stored in the storage device when the pickup radiates the laser beam onto an N.sup.th track of the optical disc.

REFERENCES:
patent: 5416757 (1995-05-01), Lueke et al.
patent: 5729510 (1998-03-01), Kasahara et al.
patent: 5754512 (1998-05-01), Komma et al.
Patent Abstracts of Japan, for JP 9-35315 (published Feb. 7, 1997).

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