Optical information reproducing apparatus

Details Optical information reproducing apparatus Optical information reproducing apparatus

1982-03-15

1984-11-13

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 47, 250202, H04N 576, G11B 2100

Patent

active

044829876

ABSTRACT:
An optical information reproducing apparatus comprises an optical system adapted for shifting a light spot to impinge upon a track of a disk and for condensing the reflected light beam so as to impinge upon a photodetector. The output of the photodetector is sampled at predetermined intervals so that the envelope value thereof may be read. Successive envelope values, as sampled, are compared to provide a difference signal thereof. An error signal is obtained based on the positive or negative difference signal. The position of the light spot is adjusted as a function of the error signal.

REFERENCES:
patent: 4359635 (1982-11-01), Gross

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