Dual radial position servo to compensate for radial tracking fai

Details Dual radial position servo to compensate for radial tracking fai Dual radial position servo to compensate for radial tracking fai

1978-12-26

1980-12-16

Konick, Bernard

Dynamic magnetic information storage or retrieval

Head

Core

360 38, 360 77, G11B 2110

Patent

active

042399424

ABSTRACT:
An apparatus for reading a disk-shaped record carrier, the radial scanning position being controlled with the aid of a first servo control loop, which controls a positioning member for the read element depending on a control signal which is read from the record carrier. If this control is disturbed a second servo control loop is rendered operative. This second servo control loop comprises a position indicator for supplying a position signal which is representative of the radial position of the positioning member, a memory circuit for storing the value of this position signal at the instant of failure of the first servo control loop, and a differential amplifier for applying a control signal to the positioning member, which signal corresponds to the difference between the instantaneous and the stored value of said position signal. Furthermore, there is provided a control circuit for changing-over between the first and the second servo control loop and vice versa depending on a built-in criterion.

REFERENCES:
patent: Re29963 (1979-04-01), Janssen
patent: 3381086 (1968-04-01), De Moss et al.
patent: 4142209 (1979-02-01), Hedlund et al.
patent: 4151566 (1979-04-01), Ohrman

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