Optical storage apparatus

Details Optical storage apparatus Optical storage apparatus

1998-02-12

2000-12-05

Huber, Paul W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4432, G11B 700

Patent

active

061575992

ABSTRACT:
In a low speed seek control unit, when it is judged by an error detection judging unit that a zero-cross error detection has occurred during a seeking operation, a speed prediction calculating unit predictively calculates a correct speed on the basis of the last track zero-cross interval free from any error detection and supplies the predicted speed in place of a detected speed to a speed control unit for the execution of a speed control, while a counter modification unit returns a track counter so as to have a value before the error detection. In a high speed seek control unit, when it is judged by an error detection judging unit that a zero-cross error detection has occurred, a speed prediction calculating unit predictively calculates a correct speed and supplies the predicted speed in place of a detected speed to a speed control unit for the execution of a speed control, while a counter modification unit modifies a track counter so as to have a correct value.

REFERENCES:
patent: 5457671 (1995-10-01), Takata et al.
patent: 5623461 (1997-04-01), Sohmuta

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