Hitachi, Ltd.

Hitachi Mizusawa Electronics Co.

Hitachi Mizusawa

Kouji Fukuma

Soichi Sakurai

Nobutaka Okuyama

Kouji Kitou

Michitaka Ohsawa

Masao Obara

Kazuo Majima

Isao Yoshimi

Hiroki Oguro

Yoshio Yoshiwara

Minoru Furuya

Hiroshi Yoshioka

Takahisa Mizuta

Yoshihiro Obara

A cathode-ray tube apparatus capable of reducing a high frequency electric field radiated from the deflection yoke and the deflection and high voltage circuit to the outside of the cathode-ray tube apparatus. Mounted on the deflection yoke or on the cathode-ray tube are an induction coil for generating a pulse voltage opposite in polarity to a high pulse voltage applied to the h and an electric field cancellation electrode made of a conductive wire to which the opposite polarity pulse voltage is applied. When the opposite polarity pulse voltage is applied to the electric field cancellation electrode, the electric field cancellation electrode radiates an electric field opposite in polarity to the high frequency electric field radiated from the deflection yoke to the outside of the cathode-ray tube apparatus to reduce the intensity of the high frequency electric field.

Cathode-ray tube apparatus and yoke

A deflection yoke device comprises a convergence correction circuit connected between a vertical deflection coil and correction coils. The convergence correction circuit includes a first, second and third impedance elements connected in parallel and at least two diodes. The diodes are connected in series in the same direction and respond to a vertical deflection current of the vertical deflection coil to regulate a current flowing through the correction coils to thereby correct the YH mis-convergence.

Deflection yoke device and color cathode ray tube using the same

Growing community of inventors

Yokohama, Japan

Kouji Fukuma