Apparatus for reproducing an image of variable tone density

Details Apparatus for reproducing an image of variable tone density Apparatus for reproducing an image of variable tone density

1980-08-04

1982-02-02

Hix, L. T.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358298, H04N 122

Patent

active

043142613

ABSTRACT:
An image is printed on a photo-sensitive medium in the form of an array of pixels of various tone densities. The medium (11) is moved at a constant speed in a Y direction behind a screen (10). The screen (10) has columns of apertures (13) extending in the Y direction, with the different apertures of each column being of different sizes. A beam of light of constant intensity (preferably a laser beam from a laser generator (19)) scans regularly in an X direction over the screen. The laser beam is selectively deflected by means (40) to expose the photo-sensitive medium through a selection of the apertures of each column. Since the apertures are of different sizes the exposure is different through each size and thus dots of selectable size can be printed on any point of the medium. On any one scan, the light beam is capable of exposing any number of the apertures in each column, from none to all of them.

REFERENCES:
patent: 3967894 (1976-07-01), Tsilibes
patent: 4014030 (1977-03-01), Stark et al.
patent: 4110796 (1978-08-01), Aughton
patent: 4151563 (1979-04-01), Gast et al.

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