Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-12-21
1997-12-16
Huber, Paul W.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 369 50, 369 60, G11B 700, G11B 509
Patent
active
056993331
ABSTRACT:
A method and apparatus for optically reading out pre-recorded signals on an optical disc by way of data reproduction. If the quantity of playback data read out from an optical disc 1 and stored in a memory 8 during data reproduction is found to be in excess of a quantity for one rotation of the optical disc, data writing in the memory 6 is discontinued and an optical pickup 3 is caused to make track jump to a reproduced track under control by a controller 7. A servo gain control signal or a servo offset control signal is sent to a servo circuit 8 which then performs focusing servo control or tracking servo control of the optical pickup 3. The writing stop position on the optical disc 1 is then detected and data playback is re-initiated. Stabilized data playback is enabled even if servo error signals are fluctuated within the optical disc or the servo error signals are changed due to temperature changes in the optical pickup or in the error signal detecting amplifier.
REFERENCES:
patent: 5289440 (1994-02-01), Bakx
patent: 5463607 (1995-10-01), Roth et al.
Frommer William S.
Huber Paul W.
Sinderbrand Alvin
Sony Corporation
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