Abstract: A electron gun includes three cathodes aligned in line, and a plurality of electrodes sequentially arranged from these cathodes in a direction in which the cathodes emit electron beams, wherein, of the plurality of electrodes, the facing portions of a convergence electrode and a final acceleration electrode forming a main lens are respectively constructed by cylindrical common peripheral rim electrodes long in the inline direction which form aperture holes common to the three electron beams, and the inner circumferential surface of the peripheral rim electrode of at least one of the convergence electrode and the final acceleration electrode has an almost polygonal shape with substantially six or more sides so as to correct any multipole lens components.

Abstract: In a color cathode ray tube apparatus, three electron beams emitted from cathodes form cross-over points and diverge from the cross-over points, respectively. Each of the diverged electron beams is guided through a first quadruple electron lens, a sub-lens, a second quadruple electron lens, and a main lens to a phosphor screen. The sub-lens has lens power for converging the electron beam. The first quadruple electron lens has first horizontal and vertical lens powers for diverging and converging the electron beam in the horizontal and vertical planes, respectively. The second quadruple electron lens has second horizontal and vertical lens powers for converging and diverging the electron beam in the horizontal and vertical planes, respectively. The main lens has a focusing lens power for focusing the electron beam onto the screen. The first and second horizontal and vertical lens powers and the focusing lens power are varied depending on the deflection of the electron beam.