Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1988-04-29
1989-12-19
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 45, G11B 700
Patent
active
048887544
ABSTRACT:
An arrangement for reproducing data readable by an optical scanner from tracks on a recorded medium. At least one beam of light is focused onto the medium, and the beam is positioned along the tracks by a tracking control. The recorded medium reflects the beam onto a photodetector which generates an electrical data signal having a phase relation, a focusing error signal also having a phase relation for indicating the current state of the focus control. A tracking error signal also supplied by the photodetector indicates the current state of the tracking control. A control amplifier is connected in the focus control and has an offset voltage. An offset compensation voltage is supplied to the input of the control amplifier for compensating the offset voltage of that amplifier. The offset compensation voltage is varied at the input of the control amplifier until the phase relation of the focusing error signal coincides with the phase relation of the data signal for obtaining the correct value for the offset compensation voltage.
REFERENCES:
patent: 4707817 (1987-11-01), Yoshio
patent: 4769801 (1988-09-01), Funada
patent: 4812726 (1989-03-01), Benii
Deutsche Thomson-Brandt GmbH
Fogiel Max
Richardson Robert L.
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