Optical information recording and reproducing apparatus that app

Details Optical information recording and reproducing apparatus that app Optical information recording and reproducing apparatus that app

1995-02-15

1996-01-09

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4428, 369 4435, G11B 709

Patent

active

054835100

ABSTRACT:
The present invention provides an optical information recording and reproducing apparatus wherein a light beam spot is properly illuminated onto a recording medium by detecting a tracking error signal and/or a focus error signal in a time shared mode and by activating a tracking actuator and/or a focus actuator, thereby performing the recording and reproducing of information. The apparatus of the present invention includes a device for approximating an error signal on the basis of a plurality of error signals previously detected, when an error signal cannot be detected during an error signal detecting operation.

REFERENCES:
patent: 4785442 (1988-11-01), Ohtake et al.
patent: 4918680 (1990-04-01), Miyasaka

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