Small phosphor area black matrix fabricating process

Claim 1

In a cathode ray tube having a viewing panel with an inner surface, a multiple-apertured mask spaced from said inner surface, and a screen structure with a multitude of phosphor receiving areas smaller than said apertures of said mask interconnected by a webbing of opaque material affixed to said inner surface, a screen structure fabricating process comprising the steps of: coating said inner surface of said viewing panel with a photo-sensitive resist material to provide a first film capable of solubility alteration upon exposure to actinic radiation; exposing said first film to actinic radiation directed through said apertured mask to provide insoluble film areas of a given size interconnected by a webbing of soluble film; depositing a coating of resist material over said first film and drying to provide a second film adhered to said first film; removing said second film, said soluble portions of the first film and portions of said insoluble areas of said first film to provide insoluble areas of said first film of a size smaller than said given size and interconnected by a bare inner surface of said viewing panel; overcoating said bare inner surface of said viewing panel and said insoluble areas smaller than said given size of said first film with a third film of opaque material; removing said insoluble areas smaller than said given size of said first film and said overcoating of said third film of opaque material thereon to leave an interconnecting web of opaque materials; and depositing phosphor materials on said areas of a size smaller than said given size intermediate said web of opaque materials.