Process of metallizing a cathode-ray tube screen

Abstract

Abstract THE SCREEN OF A COLOR CATHODE-RAY TUBE HAVING PHOSPHOR DOTS DEPOSITED BY SLURRYING TECHNIQUES IS PROVIDED WITH AN ORGANIC FILM AS A SUBSTRATE OVER WHICH AN ALUMIMUM LAYER IS APPLIED. THE FILM IS FORMED BY DISTRIBUTING OVER THE SCREEN A COATING OF A WATER-BASED EMULSION OF AN ORGANIC FILM-FORMING COMPOUND MIXED WITH AN AQUEOUS SOLUTION OF A POLYMERIC COMPOUND. THE AQUEOUS SOLUTION IS MISCIBLE WITH THE FILM-FORMING EMULSION AND THE POLYMERIC COMPOUND HAS A LOWER VOLATING TEMPERATURE THAN THE FILM-FORMING COMPOUND. DRYING OF THIS COATING FORMS THE FILM OR SUBSTRATE FOR THE ALUMINUM LAYER. IN BAKEOUT OF THE TUBE, THE POLYMERIC COMPOUND VAPORIZES FIRST AND CREATES VOIDS OR RUPTURES IN THE ALUMINUM LAYER, FACILITATING EGRESS OF GASES GENERATED BY VOLATILIZATION OF THE FORMED ORGANIC FILM. WHERE THE PHOSPHOR DEPOSITS OF THE SCREEN ARE LAID DOWN BY ELECTROSTATIC DEPOSITION, THE FILM OR SUBSTRATE FOR THE ALUMINIZED LAYER IS FORMED IN TWO DISCRETE PROCESSES. IN THE FIRST, THE SCREEN IS COATED WITH A SIMILAR MIXTURE OF A WATER-BASED EMULSION OF AN ORGANIC FILM-FORMING COMPOUND AND AN AQUEOUS POLYMER SOLUTION BUT NOW WITH SUCH CONCENTRATION OF THE SOLUTION AS TO EFFECT PARTIAL PHYSICAL PRECIPITATION OF RESIN SOLIDS CONTAINED IN THE FILM-FORMING COMPOUND TO PARTIALLY FILL THE INTERSTICES OF THE SCREEN. AFTER THIS COATING HAS BEEN DRIED, A SECOND COATING OF THE FILM-FORMING EMULSION, WITH OR WITHOUT THE POLYMER SOLUTION ADDITIVES IS APPLIED AND DRIED TO PRESENT A SMOOTH SURFACE FOR RECEIVING THE LAYER OF ALUMIMUM.

Inventors

• 👤 Lester E Schniepp

Bibliographic Details