Electron gun assembly having cathodes insulatively mounted in metallic plate

Claim 1

In cathode ray tube electron gun structure of the type including a plurality of electrically insulative rods supporting a plurality of associated electrode elements including apertured control grid means, improved shielded cathode structure comprising: a unitary metallic cathode mounting plate supported on said rods and having three apertures aligned with corresponding apertures of said control grid means; a metallic cathode eyelet mounted in each of said apertures in said plate, each said eyelet having a peripheral, transversely extending mounting flange overlying planar surface portions of said plate on the side remote from said grid means, said portions immediately surrounding the apertures therein; and an annular body of fused glass frit interposed between each said eyelet and said plate and between each said mounting flange and the confronting overlain surface portions of said plate, and providing insulative mounting of each said eyelet in said plate, each said eyelet supporting a cathode sleeve having an open end portion and an opposite, walled end portion provided with electron emissive material confronting a corresponding one of said apertures of said control grid means said cathode mounting plate including support spades formed integrally therewith and having portions embedded in said insulative rods.