Bi-potential electrode space-saving cathode ray tube

摘要

A plural-beam cathode ray tube (10) includes an electron gun (12) directing electrons towards a faceplate (20) having an electrode biased at screen potential. The electron beam is magnetically deflected to scan across the faceplate to impinge upon a pattern of phosphors thereon to produce light of different colors depicting an image. A first conductive coating (44) near the tube neck (14) is biased below screen potential and a second conductive coating (46) between the neck electrode and the faceplate is biased at screen potential. A gap (45) between the first and second conductive coatings varies in distance from the faceplate so as to be non-Z-planar. The non-Z-planar gap is preferably partly within the region wherein electrons are deflected by the magnetic deflection yoke (16) and partly more proximate the faceplate than such deflection region.