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US 4,288,512 AGranted
Method of manufacturing luminescent screens for color picture tubes
AssigneeInternational Standard Electric Corporation
InventorsBruno Fischer, Rainer Vollath
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Abstract
A rotating diaphragm is used to distribute a predetermined amount of light onto a light-sensitive phosphor layer on a glass faceplate in order to obtain sharp-edged phosphor stripes.
Claims2
A method of manufacturing luminescent screens for color-picture tubes comprising the steps of:
- coating the faceplate with a light sensitive layer of luminescent material,
- exposing the faceplate to light through a shadow mask by means of a pencil of light rays from a light source,
- inserting a diaphragm having an aperture of radially increasing width in the path of said light rays, and
- rotating said diaphragm at a rate of approximately 100-200 revolutions per minute so that the amount of light reaching said faceplate increases from the center to the outside edge.
1 more element
Dependencies are inferred from the claim text.