Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-09-20
1992-04-28
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369 4436, 369 54, G11B 795, G11B 700
Patent
active
051093677
ABSTRACT:
For an output signal of an error signal generating circuit generating a focus error signal and/or track error signal, it is materialized that a highly precise servo system can sufficiently deal with the case in which the change of the light intensity by switching recording and reproducing or the like and the dispersion of offset and sensitivity by an optical system exist, by providing with a compensating operational circuit generating a normalized focus and/or track error signal being independent of the reflected light intensity from a recording medium and/or the light intensity distribution and also the difference of sensitivity, and by providing with a bias applying circuit applying a bias component for deleting offset and so forth in the signal of this compensating operational circuit.
REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4823330 (1989-04-01), Arter et al.
patent: 4975895 (1990-12-01), Yanazi
patent: 4977551 (1990-12-01), Minami et al.
Envall Jr. Roy N.
Olympus Optical Co,. Ltd.
Tran Thang V.
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