COLOR PICTURE TUBE HAVING INLINE ELECTRON GUN WITH COMA CORRECTION MEMBERS

摘要

RCA 82,624 A b s t r a c t An improved color picture tube has an inline electron gun for generating and directing three inline electron beams, comprising a center beam and two outer beams, along initially coplanar paths toward a screen of the tube. The beams pass through a deflection zone adapted to have two orthogonal magnetic deflection fields established therein. A first of the fields causes deflection of the beams in a first direction perpendicular to the inline direction of the beams, and a second of the fields causes deflection in a second direction parallel to the inline direction of the beams. The gun includes two shunts for shunting portions of both deflection fields around the outer beam paths. Each shunt comprises one magnetically permeable member having an aperture therein and completely surrounds one of the electron beam paths. The improvement comprises each shunt being longer in the first direction than in the second direction, and being symmetric about a central axis of the shunt that parallels the first direction and symmetric about another central axis of the shunt that parallels the second direction.