Patent ID: 6380667
Filing Date: 2002-04-30
Classification: H01J

Abstract:
A color cathode-ray tube apparatus comprising:a vacuum envelope composed of a substantially rectangular panel, a funnel formed to be continuous with the panel and having a small-diameter end portion, and a neck formed to be continuous with the small-diameter end portion of the funnel; a phosphor screen having phosphor layers provided on an inner surface of the panel; a shadow mask having a surface opposed to the phosphor screen at a distance from the phosphor screen, the surface having a great number of electron beam passage holes; an electron gun apparatus provided within the neck and having a cathode and a plurality of electrodes for emitting three in-line electron beams consisting of a center beam and a pair of side beams traveling in the same plane; a deflection yoke mounted on a region extending from a funnel-side portion of the neck to a small-diameter portion of the funnel, the deflection yoke deflecting the three electron beams in a first direction, which is a direction of arrangement of the three electron beams, and in a second direction perpendicular to the first direction; and trajectory correction means for correcting trajectories of the side beams, the trajectory correction means including a plurality of trajectory correction coils disposed between the cathode of the electron gun apparatus and the phosphor screen and a current supply circuit for supplying to the trajectory correction coils a current synchronized with deflection of at least one of said first direction and said second direction, at least one of the trajectory correction means functioning to relatively over-converge or under-converge the pair of side beams at a peripheral portion of the phosphor screen relative to a center of the phosphor screen, there is a position in a magnetic field produced in a region of passage of the three electron beams, where no force is exerted on the three electron beams in the one direction of the first and second directions, and a magnetic field being produced to separate this position from a plane including a tube axis, the other direction of the first and second directions.