Patent ID: 6229256
Filing Date: 2001-05-08
Classification: H01J

Abstract:
A cathode ray tube comprising;an electron gun assembly for emitting a plurality of electron beams arranged in a row to proceed on a same horizontal plane and focusing on a target;a deflection yoke for generating a deflection magnetic field to deflect the plurality of electron beams emitted from the electron gun assembly into a horizontal direction and a vertical direction, said horizontal direction and said vertical direction being perpendicular to each other on the target;an envelope having a neck section for containing said electron gun assembly, a panel section provided with said target and a funnel section having its inner diameter increasing from the neck section toward the panel section;an internal conductive film arranged on the inner wall surface of the envelope and extending from said funnel section to said neck section; anda high resistance conductive film arranged in said neck section so as to be held in contact with an end portion of said internal conductive film on the inner wall surface of said neck section and surround at least part of said electron gun assembly from the end portion, said high resistance conductive film having an electric resistance higher than that of said internal conductive film; characterized in that:the film resistance of said high resistance conductive film per unit length of the axis of the tube running perpendicularly relative to said horizontal direction and said vertical direction is lower in a contact region located at an end portion of said high resistance conductive film and held in contact with said end portion of the internal conductive film than in a region located at the other end portion of said high resistance conductive film.