Method and apparatus for avoiding or minimizing unwanted line-st

Details Method and apparatus for avoiding or minimizing unwanted line-st Method and apparatus for avoiding or minimizing unwanted line-st

1978-12-20

1981-01-06

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358235, H04N 300

Patent

active

042440050

ABSTRACT:
A method of avoiding unwanted line structures in the electronic reproduction of images by means of a monochromatic light source in whose beam path an acousto-optic modulator (AOM) cell is arranged. One line consists of a multiple line made up of a plurality of sub-lines. The acousto-optic modulator (AOM) cell is driven by a mixture of ultrasonic waves of discrete frequencies, by which means the beam is split up into a plurality of sub-beams each associated with a discrete frequency which together determines the line width. The individual frequencies are so calculated that the sub-beams overlap and so that the amplitudes of the frequencies produce a uniform intensity distribution in a line.

REFERENCES:
patent: 3055258 (1962-09-01), Hurvitz
patent: 3997722 (1976-12-01), Bardos

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