Deflection yoke and cathode-ray tube apparatus with the same

A cathode-ray tube apparatus comprising:

• a vacuum envelope having a panel with a phosphor screen disposed on an inside of the panel, a funnel formed continuous with the panel, and a cylindrical neck formed continuous with a small-diameter end portion of the funnel;
• an electron gun assembly disposed within the neck and emitting electron beams toward the phosphor screen;
• and
• a deflection yoke mounted on an outside of the vacuum envelope and producing deflection magnetic fields for deflecting the electron beams emitted from the electron gun assembly in horizontal and vertical directions,
• wherein the deflection yoke comprises:
• a pair of saddle-shaped horizontal deflection coils disposed to be symmetric with respect to a tube axis and having a substantially truncated-pyramidal shape;
• a magnetic core having a substantially truncated-conical shape and disposed coaxially with the tube axis on an outer peripheral side of the horizontal deflection coils;
• and
• a pair of toroidal vertical deflection coils disposed to be symmetric with respect to the tube axis,
• wherein a middle point of an entire length along the tube axis from a large-diameter portion to a small-diameter portion of the magnetic core lies on a small-diameter portion side of the horizontal deflection coil relative to a point lying at a distance of 0.41×HL along the tube axis from a large-diameter portion of the horizontal deflection coil, where HL is an entire length of the horizontal deflection coil along the tube axis.

A deflection yoke comprising:

• a pair of saddle-shaped horizontal deflection coils disposed to be symmetric with respect to a center axis and having a substantially truncated-pyramidal shape;
• a magnetic core having a substantially truncated-conical shape and disposed coaxially with the center axis on an outer peripheral side of the horizontal deflection coils;
• and
• a pair of toroidal vertical deflection coils disposed to be symmetric with respect to the center axis,
• wherein a middle point of an entire length along the center axis from a large-diameter portion to a small-diameter portion of the vertical deflection coil lies on a small-diameter portion side of the horizontal deflection coil relative to a point lying at a distance of 0.41×HL along the center axis from a large-diameter portion of the horizontal deflection coil, where HL is an entire length of the horizontal deflection coil along the center axis.