Track jumping method for an optical disk reading head

Details Track jumping method for an optical disk reading head Track jumping method for an optical disk reading head

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 32, 358907, G11B 2108

Patent

active

051213737

ABSTRACT:
Track jumping in the present system is accomplished by using a two step track jump method which accelerates the tracking actuator toward the desired track at maximum acceleration and then decelerates the tracking actuator at a maximum deceleration so that the desired track is reached in a minimum amount of time without the actuator ringing. A matrix containing the times for each jump pulse from track X to track Y is recorded. The matrix table is updated after each jump to compensate for variance factors. The table is stored in memory which allows the system to become more accurate with each jump. If the actuator falls short of the desired position, the jump pulse next applied is lengthened slightly. If the jump pulse causes the actuator to overshoot, the desired position the jump pulse is shortened for the next jump.

REFERENCES:
patent: 4764914 (1988-08-01), Estes et al.
patent: 4899325 (1990-02-01), Katsuhara et al.
patent: 4939712 (1990-07-01), Abe et al.

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