Color picture tube apparatus

A color picture tube apparatus comprising:

• a color picture tube including an envelope composed of a front panel in which a phosphor screen is formed on an inner surface and a funnel, an electron gun provided in a neck of the funnel;
• and
• a deflection yoke mounted on an outer circumferential surface of the funnel, for applying a horizontal deflection magnetic field and a vertical deflection magnetic field to three electron beams emitted in an in-line shape from the electron gun to deflect the three electron beams in horizontal and vertical directions,
• 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 horizontal deflection magnetic field has a substantially uniform magnetic field distribution,
• tracks of the three electron beams are substantially parallel to a tube axis at a position of an end of the ferrite core on an electron gun side in a tube axis direction,
• a quadrupole magnetic field generator for generating a quadrupole magnetic field that acts on the three electron beams is provided in a region from a vicinity of the end of the ferrite core on the electron gun side to the phosphor screen,
• the quadrupole magnetic field has a horizontal focusing action of focusing the three electron beams in a horizontal direction even in a case where the three electron beams reach any place of the phosphor screen, and has a magnetic field distribution in which the horizontal focusing action gradually weakens as the three electron beams are deflected from a center to an outer circumferential end of the phosphor screen in the horizontal direction,
• a pair of coma aberration correction coils for correcting coma aberration, a pair of YH correction coils for correcting YH, and a pair of magnetic substance cores around which the coma aberration correction coils and the YH correction coils are wound are placed at a position on the electron gun side from the ferrite core in the tube axis direction and sandwich the neck in the vertical direction,
• a pair of vertical auxiliary coils for generating a magnetic field in the same direction as that of the vertical deflection magnetic field are placed at a position on the electron gun side from the ferrite core in the tube axis direction and sandwich the neck in the horizontal direction,
• the horizontal deflection coil includes a first coil, and a second coil composed of a winding placed on an inner circumferential side from a winding of the first coil and having a useful portion that contributes to deflection in a range of ±45° from a vertical axis with respect to the tube axis,
• a large-diameter side bend portion of the second coil that traverses the vertical axis is placed on the electron gun side from a position that is away from the end on the phosphor screen side of the ferrite core to the phosphor screen side by 10 mm in the tube axis direction, and
• the first coil and the second coil are connected in series with each other, and horizontal deflection currents in the same direction seen along the tube axis flow in a bend portion of the first coil and the bend portion of the second coil.