Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-09-23
1995-12-05
Epps, Georgia Y.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 360 7804, G11B 700
Patent
active
054735874
ABSTRACT:
A track retrieval system retrieves a track of an optical disk based on track cross pulses which correspond to a number of tracks scanned by a scan beam. The track retrieval system includes a pulse shaping circuit for generating a pulse at a zero-crossing of a track error signal which is dependent on a tracking error of the scan beam relative to the track, a masking circuit for outputting track cross pulses by masking an output of the pulse shaping circuit for a predetermined time after the pulse is output from the pulse shaping circuit, so that pulses generated by the pulse shaping circuit within the predetermined time due to chattering are eliminated, a counter for counting the track cross pulses output from the masking circuit and for outputting a counted value, and a control unit for setting the predetermined time in the masking circuit based on a moving speed of the scan beam which is calculated from the counted value output from the counter. A correcting circuit may be provided to output a track cross pulse if the pulse shaping circuit outputs no pulse within a predetermined time, so that a pulse dropout of the track cross pulse is compensated.
REFERENCES:
patent: 4663752 (1987-05-01), Kakuse et al.
patent: 5001732 (1991-03-01), Nomura et al.
patent: 5042019 (1991-08-01), Kitai et al.
patent: 5140574 (1992-08-01), Cloetens et al.
"Information Technology--130 mm Rewritable Optical Disk Cartridges for Information Interchange", Draft International Standard ISO/IEC DIS 10089.
"Data Interchange on 90 mm Optical Disk Cartridges, Read Only and Rewritable, M.O.", ECMA European Computer Manufacturers Association, ECMA/TC31/91/32, May 10, 1991.
Hamaguchi Shingo
Ozawa Yasuyuki
Epps Georgia Y.
Fujitsu Limited
Huber P. W.
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