Deflection yoke and cathode-ray tube apparatus comprising the same

A deflection yoke for use in a color cathode-ray tube having an electron gun for generating a multiplicity of electron beams in an inline array, comprising:

• horizontal and vertical deflection coils;
• and
• a main core,
• wherein the vertical deflection coil is made up of at least a pair of saddle shaped coil halves each divided into at least 2 first and second coil parts, the first coil parts of the coil halves and the second coil parts thereof are connected respectively in series or in parallel, a subcore having a vertical auxiliary deflection coil is provided on a side of the electron gun, the vertical auxiliary deflection coil includes a first correction coil for generating at least 4 polar magnetic field components and a second correction coil for generating 4 polar magnetic field components directed opposite to the 4 polar magnetic field components of the first correction coil, a series circuit of a first impedance circuit and said first correction coil is connected in parallel to a series circuit of a second impedance circuit and said second correction coil to form a parallel circuit, said parallel circuit is connected in series with said vertical deflection coil, a first shunt circuit is provided for shunting part of a vertical deflection current flowing through the second coil part of the coil halves and said first impedance circuit when the vertical deflection current is equal to or higher than a first predetermined value and flows in a first direction, a second shunt circuit is provided for shunting part of a vertical deflection current flowing through the second coil part of the coil halves and said second impedance circuit when the vertical deflection current is equal to or higher than the first predetermined value and flows in a direction opposite to said first direction, a third shunt circuit is provided for shunting part of a vertical deflection current flowing through the second coil part of the coil halves and said first or second impedance circuit when the vertical deflection current is equal to or higher than a second predetermined value and flows in said first direction, a fourth shunt circuit is provided for shunting part of a vertical deflection current flowing through the second coil part of the coil halves and said first or second impedance circuit when the vertical deflection current is equal to or higher than the second predetermined value and flows in a direction opposite to said first direction, and a shunt control circuit is provided having a function of causing a predetermined imbalance between the currents flowing through the first and second correction coils according to the vertical deflection current.

A deflection yoke for use in a color cathode-ray tube having an electron gun for generating a multiplicity of electron beams in an inline array, comprising:

• horizontal and vertical deflection coils;
• and
• a main core,
• wherein a subcore having a vertical auxiliary deflection coil is provided on a side of the electron gun, the vertical auxiliary deflection coil includes a first correction coil for generating at least 4 polar magnetic field components and a second correction coil for generating 4 polar magnetic field components directed opposite to the 4 polar magnetic field components of the first correction coil, a series circuit of a first impedance circuit and said first correction coil is connected in parallel to a series circuit of a second impedance circuit and said second correction coil to form a parallel circuit, said parallel circuit is connected in series with said vertical deflection coil, a first shunt circuit is provided for shunting part of a vertical deflection current flowing through said first impedance circuit when the vertical deflection current is equal to or higher than a predetermined constant value and flows in a first direction, a second shunt circuit is provided for shunting part of a vertical deflection current flowing through said second impedance circuit in a direction opposite to said second impedance circuit when the vertical deflection current is equal to or higher than the predetermined constant value and flows in a direction opposite to said first direction, a shunt control circuit is provided having a function of causing a predetermined imbalance between the currents flowing through the first and second correction coils according to the vertical deflection current, and a variable resistor is connected between a junction point of the first impedance circuit and first correction coil and a junction point of said second impedance circuit and second correction coil.