Image reproduction systems providing reproduction at a finer pit

Details Image reproduction systems providing reproduction at a finer pit Image reproduction systems providing reproduction at a finer pit

1975-04-30

1976-05-11

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

178 66B, 178 67R, 358 78, H04N 106, H04N 140

Patent

active

039565831

ABSTRACT:
In a system for producing screened images, for each set of image-representing signals derived from one rotation of an input scanner cylinder, n sets of screen-representing densities are derived corresponding to screen densities of parallel tracks each of which has a width which is a fraction of the screen pitch. The set of image-representing signals for a line of the image is modified n successive times as a function of the n respective sets of screen-representing densities and each of the n sets of screen-modified image-representing signals is applied in turn to modulate a single output element in an output scanner in which the scanning beam scans the image-reproducing area at a pitch that is n times finer than that of the input scanner.

REFERENCES:
patent: 3541245 (1970-11-01), Wilby
patent: 3770888 (1973-11-01), de Voss et al.
patent: 3878559 (1975-04-01), Pugsley

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