Patent ID: 6194823
Filing Date: 2001-02-27
Classification: H01J

Abstract:
A color cathode ray tube comprising: a vacuum vessel including a panel portion having a phosphor screen on its inner face, a neck portion and a funnel portion joining said neck portion and said panel portion; an in-line electron gun, disposed inside of said neck portion, including a main lens and cathode and producing a center electron beam and two side electron beams; a deflection yoke for deflecting said electron beams; and a pair of 2-pole ring magnets for adjusting electron beam trajectory, disposed around said neck and arranged so that a center of said pair of 2-pole ring magnets is close to the phosphor screen side relative to the center of said main lens, comprising two 2-pole ring magnets, said 2-pole ring magnets having a magnetic flux density distribution at a circle which is concentric with said ring magnets, the radius of the circle corresponding to the distance between adjacent electron beams at the main lens, the ratio of the amplitude of said flux density in the radial component compared to the amplitude of said flux density in the circumferential component being 0.86 to 1.38 on said circle.