Method of depositing vitreous material on a faceplate panel

Abstract

Abstract A FACEPLATE PANEL FOR A CATHODE RAY TUBE IS POSITIONED SO THAT ITS NATURAL CURVATURE FORMS A SHALLOW CONTAINER FOR A WET SOLUTION. A WET SOLUTION OF PHOTOSENSITIVE VITREOUS SLURRY IS POURED ONTO THE INTERNAL SURFACE OF THE FACEPLATE PANEL AND ASSUMES A STABLE FLUID LEVEL. THE PHOTOSENSITIVE VITREOUS SLURRY IS THEN EXPOSED TO AN EVEN DISPERSION OF ULTRAVIOLET LIGHT FROM THE OPPOSITE SIDE OF THE FACEPLATE PANEL TO PHOTODEPOSIT THE SUSPENDED VITREOUS MATERIAL THEREIN ON THE INTERNAL SURFACE, FIRSTLY IMMEDIATELY ADJACENT THE INTERNAL SURFACE AND THEN SUCCESSIVELY INWARD THEREFROM UNTIL THE DESIRED THICKNESS IS OBTAINED. THE DEPOSITED VITREOUS MATERIAL THEN CONSTITUTES A DARK SURROUND FOR A COLOR IMAGE SCREEN AND CAN BE SUITABLY ETCHED TO CONTAIN APERTURES THEREIN TO ALLOW PHOSPHOR DOTS TO BE POSITIONED ADJACENT THE INTERNAL SURFACE OF THE PANEL. AFTER ETCHING THE APERTURES IN A PEDETERMINED PATTERN, THE PANEL IS THEN FLOODED WITH A PHOTOSENSITIVE PHOSPHOR SLURRY OF A SELECTED COLOR AND EXPOSED TO THE ULTRAVIOLET LIGHT SOURCE TO DEPOSIT THE SUSPENDED PHOSPHOR IN THE APERTURES.

Inventors

• 👤 Kazimir Palac

Bibliographic Details