Screens suitable for use in photo-engraving and photo-lithograph

Details Screens suitable for use in photo-engraving and photo-lithograph Screens suitable for use in photo-engraving and photo-lithograph

1976-04-15

1978-09-19

Wintercorn, Richard A.

Photocopying

Contact printing

Light boxes

96 38, 96 45, 355 71, G03B 2160

Patent

active

041149823

ABSTRACT:
This invention is concerned with light transmitting screens which can be used in printing of half-tone illustrations such as photographs and in color television. The screen is formed on one face with a plurality of projections or depressions which so adjoin one another that the face is free of interstices, light incident on the contoured surface so formed being refracted as it passes through the screen to break up the image being transmitted into a pattern of dots. For use in color television, the projections or depressions are defined as triangular pyramids whose surfaces are subtended from their bases at different angles to be in sympathy with the wavelengths of the different colors being transmitted.

REFERENCES:
patent: 1610423 (1926-12-01), Cawley
patent: 2588373 (1952-03-01), Erban
patent: 3068754 (1962-12-01), Benjamin
patent: 3258341 (1966-06-01), Riemerschmid et al.
patent: 3671101 (1972-06-01), Finch
patent: 3737321 (1973-06-01), Torr et al.

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