Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-09-10
1976-12-14
Griffin, Robert L.
Telegraphy
Systems
Simplex-reversing periodic
178 6, 178 77, 78 75R, 178DIG7, 178DIG27, H04N 308, H04N 310
Patent
active
039977226
ABSTRACT:
A facsimile reproduction system is disclosed. The system utilizes a laser beam at the transmission station to scan across an image to be reproduced through an acousto-optic modulator (AOM) cell. The laser beam is reflected off the image onto photo detector cells to generate electrical signals analogous to tonal variation in the image. A laser beam at the receiver station is also provided to sensitize a sheet of sensitized paper to produce a facsimile of the image. The intensity of the receiving station laser beam is modulated in accordance with the photo detector electrical signals by applying the signals to an rf carrier which then is applied to an AOM cell positioned between the laser and sensitized paper. Both the transmission and reception laser beams are rapidly deflected by modulating the frequency of the rf carrier driving the respective AOM cells so that the intensity of the effective scanning profile (perpendicular to the direction of scan) is constant across the entire width of the scan line for both transmission and reception and is close to the ideal profile.
REFERENCES:
patent: 2911463 (1959-11-01), Kretzmer
patent: 3614312 (1971-10-01), Fourier
patent: 3617931 (1971-11-01), Pinnow
patent: 3835249 (1974-09-01), Danttilo
Coch Nicholas L.
Coles Edward L.
Griffin Robert L.
Levy Gerald
The Associated Press
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