Patent
1991-11-27
1993-11-16
Richardson, Robert L.
395101, G06F 312
Patent
active
052631281
ABSTRACT:
A method and apparatus which eliminates beat like artifacts that occur when an RF signal is mixed with a pulsed signal of similar, but not identical, frequency to the RF signal. A controller for synchronizing the phase of a RF carrier signal to a video signal provides beat elimination in a high pixel rate laser printer. The video signal and RF carrier signal are multiplied and sent to an acousto-optic modulator for pulsing a uniform burst of energy in the form of a laser beam to a photoconductor. The controller may include a synchronous gateable crystal oscillator with logic such as TTL, CMOS, ECL or equivalent logic functions using discrete transistors, where the synchronous gateable crystal oscillator is frequency dependent upon a laser printing speed. Eliminating imaging defects such as variable pixel width and density provides a sharper, uniform pixel printout.
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Electronics Mar. 22, 1965 pp. 97-108.
Cianciosi Michael S.
Guerin Jean-Michel
Loce Robert P.
Nacman Aron
Richardson Robert L.
Xerox Corporation
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