Patent ID: 7274135
Filing Date: 2007-09-25
Classification: H01J

Abstract:
1. A color picture tube apparatus, comprising: an envelope composed of a front panel and a funnel; an electron gun provided in a neck portion of the funnel; and a deflection yoke for allowing a horizontal deflection magnetic field and a vertical deflection magnetic field to act on three electron beams emitted from the electron gun in an in-line shape, thereby deflecting the three 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, assuming that a tube axis is a Z-axis, an axis in a horizontal direction orthogonal to the Z-axis is an X-axis, and an axis in a vertical direction orthogonal to the Z-axis and the X-axis is a Y-axis, the horizontal deflection coil has a window portion, in which a winding is not present, at a position where a YZ-plane including the Y-axis and the Z-axis crosses, and the deflection yoke has at least one cross section orthogonal to the Z-axis that satisfies the following A to C: A. in the cross section, a plurality of magnetic substance convex portions projecting toward the Z-axis are provided in the vicinity of a position of an inner surface of the ferrite core where the Y-axis crosses; B. in the cross section, assuming that a minimum value among distances between the respective plurality of magnetic substance convex portions and the funnel is D C. a part of the vertical deflection coil is wound in a groove between the plurality of magnetic substance convex portions.