Document Type and Number:
Japanese Patent JPS5139070
Kind Code:
B1
Abstract:
In a method of making a phosphor screen for a shadow mask colour cathode ray tube, by the slurry-direct photographic process, a substrate is coated with a slurry which includes phosphor, polyvinyl alcohol, and water, and either the polyvinyl alcohol has a molecular weight within the range 170,000 to 220,000, or the slurry includes a dichromatizable resin or other material, e.g. colloidal silica or alumina, which tends to increase the viscosity of the slurry. The phosphor may be silver activated zinc sulphide or zinc cadmium sulphide.
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Application Number:
JP9506672A
Publication Date:
October 26, 1976
Filing Date:
September 21, 1972
Export Citation:
International Classes:
G03F7/04; H01J9/227; H01J29/18; H01J29/22; (IPC1-7): H01J9/227