Method for automatically compensating for the eccentricity in an

Details Method for automatically compensating for the eccentricity in an Method for automatically compensating for the eccentricity in an

1989-10-25

1992-06-09

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4434, 369 4435, 369 4436, 369 32, G11B 2110

Patent

active

051213745

ABSTRACT:
The present method operates upon an optical disk type servo-system of the type having an optical tracking servo for maintaining a lens centered over a track on a disk and a tracking position servo for moving an optical head's lens to a desired position. Included within such a system is an eccentricity sub-system for providing a compensating sine wave signal for reducing errors in tracking due to disk decentering. The present method automatically adjusts the gain in one of the servos to match the gain appearing in the other servo so as to improve the smoothness of control when switching between the servos.

REFERENCES:
patent: 4628379 (1986-12-01), Andrews, Jr. et al.
patent: 4764914 (1988-08-01), Estes et al.

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