Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-08-07
1999-10-26
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
059740108
ABSTRACT:
In an optical pickup, the sum signal -V.sub.MAIN of the light receiving sections A, B, C and D of a main photo diode is applied to an inversion amplifier Amp9, and the sum signal V.sub.MAIN is applied to a data processor section and a mirror signal arithmetic section. An inversion amplifier Amp10, on the side of sub photo diodes, receives the sum of the sum signal -V.sub.SUB E and a corrected signal C*V.sub.MAIN which is obtained by adjusting the sum signal V.sub.MAIN of the main photo diode with a variable resistor VR1. The output of the inversion amplifier Amp10 becomes a regular sub beam receiving signal V.sub.SUB which is obtained by subtracting a correcting signal whose voltage is equal to the main beam leakage signal from the sub photo diode sum signal V.sub.SUB E. The regular sub beam receiving signal is applied to the mirror signal arithmetic section.
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Hindi Nabil
Mitsumi Electric Co. Ltd.
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