Method of screening half-tone picture themes

Details Method of screening half-tone picture themes Method of screening half-tone picture themes

1985-07-29

1987-04-21

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing superposed layers

283 91, 283901, 355132, B42D 1500

Patent

active

046591133

ABSTRACT:
A method of screening half-tone picture themes, in which the gray tones of the half-tone picture theme are reproduced by changes in the structural width of a basic screen structure having any desired form. The assignment of a gray tone area of the half-tone picture theme to the screen structure width reproducing this gray tone area may be selectively determined. In a photographic version of the inventive method (FIG. 1), a basic screen structure 1 of any form is prepared and used to produce broadening screen structures as negative films 9,11. The same number of tone separations 20,22 is produced as negative films from the picture theme 13 to be screened, each of which tone separations reproduces a certain gray tone area of the half-tone picture theme which can be adjusted by the exposure time. Tone separations 22,20 are consecutively exposed onto a line material 24 with the broadening screen structures 9,11 respectively assigned to them, the line material then reproducing the screened picture theme in such a way that the gray tone parts determined by the tone separation are reproduced locally by the screen structure width assigned to it. There are several photographic and EDP/scanner/laser variants of this method suitable for screening half-tone picture themes, producing screened printing originals and printing data carriers with this kind of screened picture theme.

REFERENCES:
patent: 1872943 (1932-08-01), Harvey
patent: 2767093 (1956-10-01), Bilhoefer
patent: 2952080 (1960-09-01), Avakian et al.
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patent: 3610120 (1971-10-01), Morse et al.
patent: 3807852 (1974-04-01), Hoydic
patent: 4227779 (1980-10-01), McElligott et al.
patent: 4265469 (1981-05-01), Mowry, Jr. et al.
patent: 4360548 (1982-11-01), Skees et al.
patent: 4459020 (1984-07-01), May et al.

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