Deflection yoke and cathode ray tube apparatus provided with the same

A cathode ray tube apparatus comprising:

• a vacuum envelope including a panel having a phosphor screen formed on an inner surface thereof, a funnel fixed to the panel, a cylindrical neck fixed to a small-diameter end of the funnel, and a yoke mounting portion substantially in the shape of a truncated pyramid and ranging from the neck to an outer periphery of the funnel;
• an electron gun which is located in the neck of the vacuum envelope and emits electron beams toward the phosphor screen;
• and
• a deflection yoke which is mounted on the outside of the yoke mounting portion and deflects the electron beams in horizontal and vertical directions,
• the deflection yoke including a pair of saddle-type horizontal deflecting coils located symmetrically with respect to a central axis and having the shape of a truncated pyramid, a magnetic core coaxial with the central axis, located on an outer peripheral side of the horizontal deflecting coils, and having the shape of a truncated cone, and a pair of vertical deflecting coils toroidally wound around the magnetic core,
• if the position of a horizontal axis perpendicular to the central axis and the position of a vertical axis perpendicular to the central axis and the horizontal axis are given by 0° and 90°, respectively, in the direction of the circumference of a circle around the central axis, the winding of one of the vertical deflecting coils having a starting point on the horizontal-axis side within the range of 5°-30° and being distributed continuously or intermittently from the starting point to 90° and wound symmetrically with respect to the vertical axis, and the respective windings of the one vertical deflecting coil and the other vertical deflecting coil being wound symmetrically with respect to a horizontal axis.