Abstract: In an in-line electron gun for a color picture tube, 10c aligned with three cathodes 10a, 10b and 10c, through-holes of a control grid 11 and an accelerating electrode 12 are spaced by a distance S.sub.1 ; distance S.sub.2 between inlet through-holes 13a, 13b and 13c of a first focusing electrode 13 are spaced by a distance S.sub.3 ; outlet through-holes 13d, 13e and 13f of the first focusing electrode 13 and inlet through-holes 14a, 14b and 14c of a second focusing electrode 14 are spaced by a distance S.sub.3 ; outlet through-holes 14d, 14e and 14f of the second focusing electrode 14 and of an anode, 15 are spaced by a distance S.sub.4. The distances are selected to have a relation of S.sub.4 <S.sub.3 <S.sub.1 <S.sub.2, enabling misconvergence to be minimized.

Abstract: In a cathode ray tube apparatus having an in-line type electron gun, the focusing grid of the quadrupole electric field (8) which comprises the horizontal-electric-field boosting grids (11) and (11') and the vertical-electric-field boosting grids (12) and (12') is disposed between the first focusing grid (7) and the second focusing grid (9).

Abstract: An in-line electron gun is constructed according to the present invention such that the common center axes (18b), (18c) of side beam apertures (16b), (16c) of a control electrode (12) and an accelerating electrode (13) are displaced toward a tube axis (19) from the center axes (21b), (21c) of the side beam apertures defined in the end surface of the focussing electrode (14) on the side of the accelerating electrode, and the common center axes (24b), (24c) of the side beam apertures (23b), (23c) defined in the opposite end surfaces of the focussing electrode (14) and the anode electrode (15) are displaced toward the tube axis (19) from the common center axes (18b), (18c) of the side beam apertures (16b), (16c) of the control electrode (12) and the accelerating electrode (13).

Abstract: In an in-line electron gun, three apertures, closer to an accelerating electrode, of a focusing electrode, which forms three main electron lenses, are defined by bridging with a partition electrode means two neck portions of a peanut-shaped aperture consisting of a center or inner aperture and two outer apertures which partially overlap the center or inner aperture and are contiguous therewith, thus forming a continuous aperture in the form of a peanut pod having three seeds.