Patent ID: 6380699
Filing Date: 2002-04-30
Classification: H01J

Abstract:
A color display tube device comprising:a glass bulb having a phosphor screen on an inner surface thereof; an in-line electron gun that is arranged in the glass bulb and irradiates an electron beam on the phosphor screen; and a deflection device that is arranged outside the glass bulb and has a horizontal deflection coil and a vertical deflection coil; wherein a first magnetic field generator for generating a magnetic field having a same polarity as a magnetic field generated by the vertical deflection coil during a deflection toward an upper side is provided above a horizontal axis of the deflection device, and a second magnetic field generator for generating a magnetic field having a same polarity as a magnetic field generated by the vertical deflection coil during a deflection toward a lower side is provided below the horizontal axis of the deflection device, a third magnetic field generator for generating a magnetic field having an opposite polarity to the magnetic field generated by the vertical deflection coil during the deflection toward the upper side is provided above the horizontal axis of the deflection device, and a fourth magnetic field generator for generating a magnetic field having an opposite polarity to the magnetic field generated by the vertical deflection coil during the deflection toward the lower side is provided below the horizontal axis of the deflection device, the first and second magnetic field generators are arranged on a side of the phosphor screen with respect to a peak position of a deflection magnetic field strength of the horizontal deflection coil and the vertical deflection coil in a tube axis direction, and the third and fourth magnetic field generators are arranged at a same position as the first and second magnetic field generators or on the side of the phosphor screen with respect to the first and second magnetic field generators in the tube axis direction.