Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof – Using specific control or specific modification of exposure,...
Patent
1978-01-25
1982-07-13
Martin, Jr., Roland E.
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
Using specific control or specific modification of exposure,...
313403, G03C 500
Patent
active
043395163
ABSTRACT:
A method of manufacturing a pair of associated reproduction masks for manufacturing shadow masks for display tubes. In order to obtain elongate apertures which are enlarged in width on the side of the mask facing the screen, the second reproduction mask is formed by reproducing the first reproduction mask on a photographic plate by means of light rays which have a substantially greater divergence in a plane perpendicular to the long dimension of the apertures than in the plane parallel thereto.
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patent: 3973965 (1976-08-01), Suzuki et al.
patent: 3993487 (1976-11-01), Hosokoshi et al.
van der Waal Jan
Vermeulen Gerard
Abate Joseph P.
Kraus Robert J.
Martin Jr. Roland E.
Tamoshunas Algy
U.S. Philips Corporation
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