Patent ID: 6603252
Filing Date: 2003-08-05
Classification: H01J

Abstract:
A tube comprising:a tube envelope having a tube neck, a funnel portion and a faceplate, wherein said faceplate is substantially rectangular having two longer edges and two shorter edges, and having a screen electrode on the faceplate for biasing at a screen potential; a source of at least one beam of electrons directed toward said faceplate, wherein said source is in said tube neck and is adapted for magnetic deflection of said at least one beam of electrons; phosphorescent material disposed on said faceplate for producing light in response to the at least one beam of electrons impinging thereon; at least first and second electrodes on an interior surface of the funnel portion of said tube envelope, each said electrodes defining a respective aperture through which the at least one beam of electrons passes, wherein said first electrode is proximal said source and distal said faceplate and is for biasing at a potential less than the screen potential, and wherein said second electrode is between said first electrode and said faceplate and is for biasing at a potential not less than the screen potential; and a third electrode comprising two formed metal electrodes mounted to said tube envelope and between which the at least one beam of electrons passes, wherein one of said formed metal electrodes is proximal each of the two shorter sides of said faceplate between said second electrode and said faceplate and is for biasing at a potential not exceeding the screen potential.