Abstract: A magnetic shielding for a cathode ray tube. A magnetic shielding case surrounds the CRT funnel and side portions of the CRT front panel. Additionally a current coil is wrapped around the CRT. In one embodiment, the coil is wrapped completely inside the shielding case. In another embodiment, the coil is wrapped partially inside the shielding case and partially outside.

Abstract: A cathode ray tube apparatus comprises three cathodes arranged in line with each other in a first direction for emission of respective electron beams therefrom, a focusing electrode having first to third apertures defined therein for the passage of the respective electron beams therethrough, a quadrupole electrode structure including first to third quadrupole electrodes one for each electron beam, each of the quadrupole electrode being comprised of a pair of horizontal electrode pieces spaced a predetermined distance from each other in a second direction perpendicular to the first direction and positioned upwardly and downwardly, respectively, with respect to the associated electron beam, and a pair of vertical electrode pieces spaced a predetermined distance from each other in a direction aligned with the first direction and positioned leftwards and rightwards with respect to such associated electron beam, and a power source circuit for applying a predetermined voltage to the quadrupole electrode structure.

Abstract: In a display device provided with a main substrate having the lower surface on which a metallic layer is formed and the upper surface on which at least a power source or a deflection circuit is arranged, a plate member having one surface formed by an insulating material and the other surface formed by a metallic material is placed with its insulating material facing the lower surface of the main substrate.

Abstract: A display device comprising a cabinet and an electromagnetic deflection yoke and a horizontal width adjusting coil received is the cabinet comprises a canceling coil for cancelling electromagnetic field noise generated from the electromagnetic deflection yoke received in the cabinet.