Patent ID: 6525494
Filing Date: 2003-02-25
Classification: H01J

Abstract:
An electron gun for a color CRT comprising:a triode portion including cathodes for emitting electron beams, a control electrode, and a screen electrode; first and second focusing electrodes located on a common axis with the triode portion for forming a quadrupole lens; and a final focusing electrode forming a large diameter lens with the focusing electrodes and including an opening through which three electron beams commonly pass, the three electron beams lying in a horizontal plane and including a central electron beam and two side electron beams on opposite sides of the central electron beam, wherein the first and second focusing electrodes include a correction unit providing a correction force acting on the three electron beams and that is larger for the two side electron beams than for the central electron beam when a dynamic voltage, synchronized with a deflection signal, is applied to at least one of the first and second focusing electrodes for forming the quadrupole lens.