Patent ID: 7129627
Filing Date: 2006-10-31
Classification: H01J

Abstract:
1. A color picture rube apparatus comprising a deflection yoke for allowing a horizontal deflection magnetic field and a vertical deflection magnetic field to act on electron beams emitted from an electron gun to deflect the electron beams in a horizontal direction and a vertical direction, wherein the deflection yoke includes a ferrite core, a horizontal deflection coil for generating the horizontal deflection magnetic field, a vertical deflection coil for generating the vertical deflection magnetic field, and an insulating frame for insulating the horizontal deflection coil from the vertical deflection coil, the ferrite core includes a plurality of convex portions arranged on an inner surface thereof in a circumferential direction of the ferrite core, the respective convex portions protrude toward a tube axis of the color picture tube apparatus, and have a ridge shape substantially along a surface including the tube axis, and among the plurality of convex portions, wherein the convex portions on a horizontal axis are horizontal axial convex portions, the convex portions on a vertical axis are vertical axial convex portions, and the convex portions in a range excluding a range of −20° to +20° with respect to the horizontal axis and a range of −20° to +20° with respect to the vertical axis are diagonal convex portions, lengths in a tube axis direction of the vertical axial convex portions are larger than those of the diagonal convex portions.