Patent ID: 6417610
Filing Date: 2002-07-09
Classification: H01J

Abstract:
A color cathode ray tube includinga vacuum envelope comprising a panel portion, a neck portion, and a funnel portion connecting said panel portion and said neck portion; a phosphor screen on an inner surface of said panel portion; a shadow mask suspended closely spaced from said phosphor screen in said panel portion; and an electron gun housed within said neck portion; said electron gun comprising three cathodes for emitting three in-line electron beams and a plurality of electrodes; said plurality of electrodes being fixed in a predetermined axially spaced relationship on insulating supports, at least one of said plurality of electrodes being cup-shaped and having a correction electrode therein, edges of said correction electrode being formed with recesses and sloped portions extending in a direction away from said recesses toward an inner wall of said at least one of said plurality of electrodes, and a distance L from a mouth of each of said recesses of said connection electrode to an inner wall of said at least one of said plurality of electrodes satisfies the following relationship: Lâ€²&lE;L&lE;15 &mgr;m, where Lâ€² is a height of a burr caused in press-forming of said recesses.