Process for track jumping

Details Process for track jumping Process for track jumping

1990-05-17

1992-11-24

Brier, Jeffery A.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 4426, G11B 7085

Patent

active

051669153

ABSTRACT:
An arrangement for track skipping in a track control circuit with an optical scanner, in which two light beams reflected from an information medium, strike each onto a separate photodetector. The two outputs of the photodetectors are subtracted to generate a sine-shaped track error signal representing a difference between a track being scanned and a desired track to be scanned. The track control circuit is supplied at the beginning of track skipping with an offset quantity for skipping across a number of tracks. This offset quantity is dimensioned so that a light beam incident on the information medium for tracking data thereon, becomes displaced by a predetermined amount of track center and thereby radiates partially on the track being scanned and partially on the space between the track being scanned and an adjacent track. The track error signal becomes inverted by an amount equal to twice the number of tracks skipped. The offset quantity becomes separated from the track control circuit earliest after the first inversion and latest after the last inversion of the track error signal. The track control circuit remains closed during track skipping.

REFERENCES:
patent: 4481613 (1984-11-01), Yokota
patent: 4539665 (1985-09-01), Iso et al.
patent: 4779251 (1988-10-01), Burroughs
patent: 4858214 (1989-08-01), Baba
patent: 5001732 (1991-03-01), Nomura et al.
patent: 5023855 (1991-06-01), Kobayashi et al.

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