Hitachi, Ltd.

Hitachi Media Electronics Co., Ltd.

Naoki Ito

Hiroshi Yoshioka

Soichi Sakurai

Nobutaka Okuyama

Masao Obara

Yoshio Satoh

Kooji Fukuma

Atsushi Takeyama

A color cathode-ray tube which includes a deflection yoke having a convergence correcting device and an electron gun provided to the deflection yoke for generating a multiplicity of electron beams. In the deflection yoke, a vertical deflection coil is made up of at least a pair of saddle type coil halves each divided into at least first and second coil parts, the first coil parts of the coil halves and the second coil parts thereof are connected respectively mutually in series or parallel, a subcore having a vertical auxiliary deflection coil is provided on a side of the electron gun, the vertical auxiliary deflection coil is made up of first and second correction coils for generating 4 polar magnetic field components which are directed at least opposite to each other, a series circuit of a first resistor and the first correction coil is connected in parallel to a series circuit of a second resistor and the second correction coil to form a parallel circuit, the parallel circuit is connected in series with the vertical deflection coil, a shunt circuit is provided for shunting a current flowing through the second coil part to supply the shunted current into the first and second correction coils to thereby cause a predetermined imbalance between the currents flowing through the first and second correction coils, when an area of a display screen other than a predetermined range in a vertical direction is subjected to a vertical deflection. Thereby horizontal and vertical line misconvergences can be corrected.

Deflection yoke and cathode-ray tube apparatus comprising the same

Growing community of inventors

Kitakami, Japan

Naoki Ito