North American Philips Consumer Electronics Corp.

Gte Sylvania Incorporated

Gordon T Foreman

Anthony V Gallaro

Robert L Bergamo

Judy A Nagel

George N Williams

Phosphor characters to supply feedback information for an automatic convergence system are applied to the gun side of the shadow mask of a color cathode ray tube by a method of applying layers of a positive-working photoresist and phosphor, exposing the layers through a positive photomask, back exposing to clear the shadow mask apertures, developing to remove the exposed areas, and baking to remove the photoresist.

Photographic process for applying phosphor pattern to color CRT shadow

Fine particle size phosphors are adhered to the back of the aperture mask of a cathode ray tube by spraying a dispersion of such particles in a coating vehicle containing a temporary binder, and baking to remove the binder. The adhered phosphor is useful in providing information about the location of the scanning electron beams during tube operation.

Process for applying phosphor to the aperture mask of a cathode ray tube

A high resistive electrical conductive coating of discrete composition is provided for band-like deposition in a defined area of the interior surface of substantially the funnel member of a cathode ray tube envelope between the region of the high potential transversal therethrough and the electron generating means oriented in the contiguous neck portion. The coating is an amorphous deposition of a homogeneous mixture of a vitreous substantially insulative frit material admixed with at least one particulate material selected from the group consisting essentially of cadmium oxide, indium oxide and copper oxide wherein the individual particles of the respective oxide ingredients are uniformly dispersed and encapsulated to provide a discretely defined resistive structural means for effecting arc suppression in the region of the electron generating assembly.

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Seneca Falls, NY, United States of America

Gordon T Foreman