Electron beam deflection device for cathode ray tubes which is self convergent and geometry corrected

Deflection device for a cathode-ray tube with three coplanar guns, comprising:

• a pair of vertical deflection coils;
• a pair of horizontal deflection coils, each horizontal deflection coil having a main deflection winding extending over the length of the deflection device and an auxiliary deflection winding, each main deflection winding having a front portion and a rear portion, the auxiliary deflection winding being disposed in the front portion of the main deflection winding;
• each of the auxiliary windings having conductors arranged laterally about a mean angle from a horizontal deflection axis, the mean angle varying as a function of the position of the conductors along a longitudinal axis of the deflection device.

Deflection device for a color cathode-ray tube with three electron beams, comprising:

• a pair of vertical deflection coils;
• a pair of horizontal deflection coils, each horizontal deflection coil having a main deflection winding for generating a main magnetic field and an auxiliary deflection winding for generating higher-order harmonics of the Fourier series decomposition of the angular distribution of the ampere-turn density in the main deflection field, the auxiliary deflection winding having conductors being arranged laterally about a mean angle from a horizontal deflection axis, the mean angle varying as a function of the position of the conductors along a longitudinal axis of the deflection device, to adjust a percentage of the higher-order harmonics in order to adjust geometry and convergence.