Patent ID: 6831400
Filing Date: 2004-12-14
Classification: H01J

Abstract:
A color cathode ray tube apparatus comprising:a cathode ray tube having an electron gun assembly which emits three electron beams arranged in a line and a phosphor screen which glows as the electron beams emitted from the electron gun assembly hit the phosphor screen; and a deflection device having a horizontally deflecting coil for generating a horizontally deflecting magnetic field which deflects the electron beams in a horizontal direction and a vertically deflecting coil for generating a vertically deflecting magnetic field which deflects the electron beams in a vertical direction, the electron gun assembly emitting at least one electron beam having an oblong cross-sectional shape extending substantially in the horizontal direction and emitting the three electron beams in a substantially non-convergent state toward the central portion of the phosphor screen, the deflection device including an auxiliary magnetic field generator for generating a quadrupole magnetic field component which focuses the electron beam with an oblong cross section more heavily in the horizontal direction than in the vertical direction, and the auxiliary magnetic field generator being located in a given region in a tube-axis direction in which the horizontally deflecting coil is located.