Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-02-04
1976-01-06
Moffitt, James W.
Telegraphy
Systems
Simplex-reversing periodic
178 66DD, 1791003V, 1791003G, G11B 724, H04N 100, H04N 302
Patent
active
039314600
ABSTRACT:
A video disc has a storage track formed of half wavelength pits alternating with lands. The track has a series of turns, individually of a generally circular path but undulating symmetrically about that path. The undulations of the several turns have such relative phase that the turns are in nested concentric relation and one component of the stored information represents the phase of the undulations.
The record is a replication of a master formed under the control of a laser writing beam modulated with the information to be stored. A Bragg cell in the optical path, responding to a cyclic frequency-modulated signal, optically displaces the writing beam about a reference path to develop undulations in the record storage track.
REFERENCES:
patent: 1917003 (1933-07-01), Williams
patent: 3673412 (1972-06-01), Olson
patent: 3798388 (1974-03-01), Dickopp
Eduology, Vol. 4, Issue 1, 1973, On Printing Motion by P. Kramer and K. Compaan.
Levy Stewart
Moffitt James W.
O'Connor Cornelius J.
Zenith Radio Corporation
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