Optical video disc playback system with position servo

Details Optical video disc playback system with position servo Optical video disc playback system with position servo

1974-03-13

1976-04-20

Konick, Bernard

Telegraphy

Systems

Simplex-reversing periodic

178 67A, 1791003V, H04N 576, G11B 700

Patent

active

039521486

ABSTRACT:
An optical video disc playback system includes a feedback or servo arrangement through which radial beam tracking is maintained by controlled displacement of a mirror about a reference axis. The optical system which controls the reading beam is unique in that displacement of the mirror for tracking registration occasions no motion of the light pattern projected onto a photoreceptor employed for the development of a tracking correction signal and/or the program signal. By maintaining the photoreceptor at a distance from the record medium determined by the parameters of the final lens of the optical system, spurious error signals caused by record eccentricities are obviated.
Various optical systems are disclosed, both for achieving variations in the overall physical dimensions of the system and for accommodating displacement of the reading beam for timing corrections in addition to beam displacement for radial tracking correction.

REFERENCES:
patent: 3381086 (1968-04-01), Moss
patent: 3530258 (1970-09-01), Gregg

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