Servo error controls

Details Servo error controls Servo error controls

1990-06-14

1991-09-03

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 4429, 369 4428, G11B 1722

Patent

active

050460609

ABSTRACT:
In a disk recorder, unintended radial portions of a transducer or head, herein termed "skating", is rapidly controlled and stopped before the transducer or head can hit a crash stop. Even when a braking operation is effected in the wrong direction, the skating compensation reverses the braking operation for rapidly stopping the radial motion of a transducer. A pair of clamp circuits are electrically interposed between the servo actuator drive signal generation and a run-out compensation circuit such that the clamping operation does not alter the run-out compensation. The sequences of machine states for effecting the state accommodation are described.

REFERENCES:
patent: 4553181 (1985-11-01), Berti
patent: 4674076 (1987-06-01), Hsieh et al.
patent: 4677602 (1987-06-01), Okano et al.
patent: 4698795 (1987-10-01), Yoshio
patent: 4719610 (1988-01-01), Bates et al.
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patent: 4764911 (1988-08-01), Morota et al.
patent: 4779251 (1988-10-01), Burroughs
patent: 4931889 (1990-06-01), Osafune
patent: 4932013 (1990-06-01), Kojima et al.
patent: 4967291 (1990-10-01), Touchton et al.

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