Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof – Using specific control or specific modification of exposure,...
Patent
1984-03-30
1986-05-20
Kittle, John E.
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
Using specific control or specific modification of exposure,...
430 26, 354 1, G03C 500, G03B 4100
Patent
active
045901376
ABSTRACT:
The present invention is an improvement in a method and apparatus for screening a line screen slit mask color picture tube. Such method includes coating a faceplate panel of the tube with a photosensitive material, inserting a slit shadow mask into the panel, and exposing the photosensitive material by passing light from a line light source through the slits of the mask. The improvement comprises positioning, between the light source and the shadow mask, means for varying the effective length of the line light source when viewed from different locations on the faceplate panel.
In a preferred embodiment, the means for varying the effective length of the line light source are curved louvers placed adjacent the light source which, when viewed from the center of the panel, shadow the ends of the light source, but which, when viewed from the ends of the minor axis of the panel, expose an effectively longer light source. In another preferred embodiment, striped patterns on a glass plate are used to effect a similar result.
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Dees Jos,e G.
Hallacher L. L.
Irlbeck D. H.
Kittle John E.
RCA Corporation
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