Electrostatic coating method
Abstract
Abstract A CONDUCTIVE SENSITIZED BINDER COMPRISING A POLYMERIZABLE BINDER MATERIAL SUCH AS POLYVINYL ALCOHOL AND A METALLIC SALT SUCH AS AMMONIUM DICHROMATE DISSOLVED IN A WATER SOLUBLE ALCOHOL AND WATER IS APPLIED TO A NONCONDUCTIVE SURFACE OF A TELEVISION PICTURE TUBE. ELECTROSTATICALLY CHARGED PHOSPHOR PARTICLES ARE PLACED ADJACENT THE TUBE SURFACE. THE CONDUCTIVE COATING OF SENSITIZED BINDER IS MAINTAINED AT PARTICLE-ATTRACTING POTENTIAL. PARTICLES ARE ELECTROSTATICALLY DEPOSITED ON THE CONDUCTIVE SENSITIZED BINDER, WHICH IS ACTIVATED, AFFIXING THE PARTICLES. ONE METHOD OF DEPOSITING PHOSPHOR PARTICLES INCLUDES PROJECTING THE PARTICLES FROM A FLUIDIZED BED TOWARD THE CONDUCTIVELY COATED TUBE SURFACE AND ESTABLISHING AN ELECTROSTATIC FIELD TO THE CONDUCTIVE COATING FROM AN ELECTRODE TO ELECTROSTATICALLY CHARGE AND DEPOSIT THE PHOSPHOR PARTICLES. THE TELEVISION PICTURE TUBE AND THE ELECTRODE MAY BE MOVED RELATIVE TO EACH OTHER DURING DEPOSITION.
Inventors
- 👤 Lester L Spiller
- 👤 Stephen J Smith
Bibliographic Details
Claims Analysis
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