Abstract: Two six-pole annular magnetic structures are arranged about the neck of a three-in-line color display tube so as to be eccentric with respect to each other and with respect to the center of the neck. The center of one six-pole is situated halfway between the central electron beam and one outer electron beam. The two beams on both sides of the center of the six-pole, consequently, are subjected to equal forces of the same direction. The third beam is subjected to a force in the same direction, but this force is nine times larger due to the three times as large distance from the center of the six-pole and due to the square-law field variation thereof. Because of their identical direction and value, the forces acting on the former beams will not disturb the convergence therebetween.

Abstract: A color television display tube comprising at least eight correction coils, arranged in one plane about the tube neck, for controlling the static convergence and possibly other aspects such as color purity.

Abstract: A color cathode-ray tube having a shadow mask comprising parallel rows of rectangular apertures. The rows of apertures are staggered relative to each other in n steps so as to reduce Moire patterns; the intermediate distance between the apertures in the direction of the rows is chosen to be equal to p/n, where p is the pitch in the direction of the rows between the apertures.