Abstract: An electron gun for a color cathode ray tube is formed such that parallel vertical blades are extending toward cathodes formed at both edges of each electron beam passing hole in the outgoing plate of a focus electrode. Horizontal blades extending toward the cathodes at a predetermined length are formed at the edges of the top and bottom portions of electron beam passing holes in the incoming plate of a dynamic focus electrode. Thus, the horizontal blades are inserted into the electron beam passing holes of the focus electrode, which reduces astigmatism due to deflection aberration and improves the focusing characteristics.

Abstract: An electron gun for a cathode ray tube includes common large-aperture electron beam passing holes which are formed by recessing the portion except the rims on the outgoing side plane of a focus electrode and the incoming side plane of a final accelerating electrode, for expanding an electric field. Three independent small-aperture electron beam passing holes are formed at the recessed position by a predetermined depth from the rims. The ratio of the horizontal diameter to the vertical diameter of the central electron beam passing hole among the three independent small-aperture electron beam passing holes of the focus electrode is smaller than those of the outer independent small-aperture electron beam passing holes. Accordingly, the influence of the spherical aberration to the electron beam which passes through the main lens is reduced, so that the quality of the picture reproduced on the screen is improved.

Abstract: An electron gun for a cathode ray tube is formed such that the spacing between the electron beam passing holes in a static focus electrode is longer than that between the electron beam passing holes in a dynamic focus electrode which forms a dynamic quadrupole lens with the static focus electrode, thereby enhancing the focusing and convergence characteristics of electron beams.

Abstract: An electron gun for cathode ray tube, wherein the outer beam passing holes of the anode have an elongated slot which has a pair of opposingly facing semi-circular arcs having a radius as large as the radius of the outer beam passing holes of the focus electrode, and the innermost arc portions of the outer beam passing holes of the anode correspond with the arcs of the outer beam passing holes of the focus electrode. According to the present invention, degradation of picture quality due to differences in focusing voltages is prevented, and assembly of the electron gun with precision is rendered easier.

Abstract: An electron gun for a cathode ray tube comprises a triode having a control electrode and a screen electrode. Each electrode has a number of beam passing holes. The diameter of the beam passing holes of the control electrode is greater than the diameter of the beam passing holes of the screen electrode. Accordingly, spherical aberrations of cathode and prefocusing lenses are decreased, thereby improving image resolution.