Deflection apparatus, cathode ray tube apparatus and beam landing adjustment method

A CRT apparatus having a deflection yoke that is fitted onto a neck portion of a CRT and installed at a position where the yoke is pressed toward a funnel portion, characterized by comprising:

• a landing correction coil provided at the rear of a horizontal deflection coil of the deflection yoke to generate a magnetic field perpendicular to the axial direction of the neck portion;
• an adjustment coil connected in series with the horizontal deflection coil to make a sawtooth current of a horizontal deflection cycle flow in the landing correction coil;
• and
• a varying in means for varying the sawtooth current of the horizontal deflection cycle made to flow in the landing correction coil.

A CRT apparatus having a deflection yoke that is fitted onto a neck portion of a CRT and installed at a position where the yoke is pressed toward a funnel portion, characterized by comprising:

• a landing correction coil provided within a magnetic field of a horizontal deflection coil of the deflection yoke to generate a magnetic field perpendicular to the axial direction of the neck portion;
• an adjustment coil connected in series with the horizontal deflection coil to make a sawtooth current of a horizontal deflection cycle in the landing correction coil;
• and
• a varying means for varying the sawtooth current of the horizontal deflection cycle flow made to flow in the landing correction coil,
• wherein said deflection yoke is electrically movable along at least one of said funnel portion and said neck portion as a result of said sawtooth current flowing in the landing correction coil.

A beam landing adjustment method for adjusting electrically a deflection center position of a deflection yoke that is installed in a CRT and fixed at a certain point, characterized by comprising the steps of:

• generating a magnetic field perpendicular to the axial direction of a neck portion of the CRT by providing a landing correction coil within a magnetic field of a horizontal deflection coil of the deflection yoke or at the rear of the horizontal deflection coil;
• making a sawtooth current of a horizontal deflection cycle flow in the landing correction coil through the horizontal deflection coil and an adjustment;
• and
• adjusting the beam landing by varying the sawtooth current of the horizontal deflection cycle made to flow in the landing correction coil using the adjustment coil to move electrically the deflection center of the deflection yoke in the back and forth direction of the neck portion.