Patent ID: 6124669
Filing Date: 2000-09-26
Classification: H01J

Abstract:
A color cathode ray tube comprising:an envelope including a panel having a phosphor screen on an inner surface thereof, and a neck formed continuous with the panel via a funnel;an electron gun structure provided within the neck and including cathodes for emitting three electron beams in a direction of a tube-axis toward the panel, the three electron beams being lined side by side along a horizontal axis;multipole magnetic field generating means provided on an outside of the neck and including at least a multipole magnet plate for producing a multipole magnetic field on trajectories of the electron beams emitted from the cathodes;a pair of strip-like first magnetic bodies extending in the tube-axis direction and disposed to be opposed to each other, with the electron gun structure interposed therebetween, and to be symmetrical with respect to a Y-Z plane, where said horizontal axis is defined as an X-axis, said tube-axis as a Z-axis and a vertical axis perpendicular to the horizontal axis and the tube-axis as a Y-axis; andsecond magnetic bodies disposed symmetrical in an X-Y plane with respect to an X-Z plane,wherein said first magnetic bodies, said second magnetic bodies and said multipole magnet plate produce a magnetic field distribution in the direction of the Z-axis on the trajectory of a center beam of the three electron beams emitted from the cathodes, the magnetic field distribution including positive magnetic field components extending from one of the first magnetic bodies to the other first magnetic body and negative magnetic field components extending from said other first magnetic body to said one first magnetic body, andthe cathodes are arranged in such a position in the direction of the Z-axis that a sum of the positive magnetic field components is substantially equal to a sum of the negative magnetic field components on the trajectory of the center beam.