Halftone image screening array of parallel lines with effective

Details Halftone image screening array of parallel lines with effective Halftone image screening array of parallel lines with effective

1992-11-23

1994-02-01

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation modifying product or process of making

Screen other than for cathode-ray tube

430264, 430265, 430300, 430396, 359893, G03F 508, G03F 706

Patent

active

052831400

ABSTRACT:
The invention provides a device for offset and similar printing from a continuous tone original to produce a halftone image on a photosensitive layer comprising means for screening the information via a first array of parallely extending lines of effective minimum optical density and a second array of parallely extending lines of effective maximum optical density, the arrays being interposed to form a composite array of substantially parallel, spaced-apart, alternating lines of effective maximum and minimum optical density, the lines delimiting therebetween zones of effective graduated optical density, the gradient inside each zone progressively varying from low optical density adjacent lines of the first array to high optical density adjacent lines of the second array, the spacing of lines of the first array being between about 100 and 400 lines per inch and wherein the resulting thickness of each reproduced line on a resulting developed photosensitive layer, generated by screening the information via the array, continuously varies as a function of the density of each information point of the original.

REFERENCES:
patent: 3647471 (1972-03-01), Thompson
patent: 3928038 (1975-12-01), Bergin
patent: 4598040 (1986-07-01), Netz et al.
patent: 4600666 (1986-07-01), Zink
C. Shapiro, The Lithographers Manual, 4th ed., pp. 6:6-6:7 1966.
Filme und Platten, Rasterphotographie, Die Raster-Photographic, A. F. Gygax, Moderne Chemigraphie in Theorie und Praxis, pp. 91-100.

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