Optical disk drive with use of sampled preceding focus or tracki

Details Optical disk drive with use of sampled preceding focus or tracki Optical disk drive with use of sampled preceding focus or tracki

1996-02-27

1997-08-19

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, G11B 7095

Patent

active

056595271

ABSTRACT:
By making the servo system insensitive to the spiked noise having high frequency components, a stable focus control and/or tracking control of an optical disk drive is realized. A digital signal processor is provided for sampling an output of an error detecting circuit for detecting an amount of deviation of control with a constant period to perform a phase compensation therefor and outputting a drive instruction value for the focus or track control on the basis of a signal sampled in a just preceding period when an error signal value sampled in a current period is larger than the error signal value sampled in the just preceding period.

REFERENCES:
patent: 4023033 (1977-05-01), Bricot et al.
patent: 4989193 (1991-01-01), Tinet
patent: 5483510 (1996-01-01), Ogino
patent: 5511052 (1996-04-01), Perry
patent: 5570330 (1996-10-01), Okawa

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