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
039314596
ABSTRACT:
A video disc for an optical image reproducing system has a storage track formed of pits alternating with lands along a spiral path. The pit depth introduces a phase change of approximately .pi./2 radians between portions of a reading beam that impinge upon pits and portions that impinge upon lands adjacent the pits.
REFERENCES:
patent: 3361873 (1968-01-01), Johnson et al.
patent: 3688025 (1972-08-01), Whittemore, Jr.
The Optical Scanning System of the Philips `VLP` Record Player by Bouwhuis & Burgstede, Philips Tech. Rev. 33, No. 7, Oct. 1973 pp. 186-189.
Eduology, Vol. 4, Issue 1, 1973, On Printing Motion by P. Kramer and K. Compaan.
Levy Stewart
Moffitt James W.
O'Connor Cornelius J.
Pederson John J.
Zenith Radio Corporation
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