Optical control system for read out from information recording m

Details Optical control system for read out from information recording m Optical control system for read out from information recording m

1977-01-11

1979-08-21

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, H04N 576, G11B 712

Patent

active

041655192

ABSTRACT:
An optical control system for information read out of video and/or audio information optically recorded in a track on the surface of a disc-shaped information medium, wherein a lightbeam is focused into a spot of predetermined transverse dimension at the locus of impingement thereof with the plane of the track and selectively deflected transversely along an edge of the track. Deviations of the light spot from the edge of the track is detected and corrected by means of feedback servo-system to maintain the light spot properly situated on the track edge. The servo-system also corrects for focus deviations in the predetermined transverse dimension of the light beam.

REFERENCES:
patent: 3673412 (1972-06-01), Olson
patent: 3829622 (1974-08-01), Elliot
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3932700 (1976-01-01), Snopko

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