Color cathode ray tube with coma reduced

Abstract

A color cathode ray tube includes a phosphor screen, a three-beam in-line electron gun, a beam deflection device, and a convergence correction device disposed on a phosphor screen side of the electron gun. The convergence correction device includes a first pair of magnetic pieces positioned on a tube-neck wall side of side electron beams and a second pair of magnetic pieces positioned on opposite sides of a center electron beam, in the in-line direction. The first pair of magnetic pieces each have a first pair of protruding portions extending toward an adjacent one of the second pair of magnetic pieces, and the first pair of protruding portions are arranged on opposite sides of a corresponding one of the side electron beams in a direction perpendicular to the in-line direction. The second pair of magnetic pieces each have two second pairs of protruding portions, one of the second pairs of protruding portions extends toward an adjacent one of the first pair of magnetic pieces and the other of the second pairs of protruding portions extends toward an adjacent one of the second pair of magnetic pieces, each of the second pairs of protruding portions being arranged on opposite sides of a corresponding one of the electron beams in a direction perpendicular to the in-line direction. The first pair of magnetic pieces have a portion of an axial length greater than that of the second pair of magnetic pieces.

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