Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1995-06-02
1997-12-23
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 8, 315 85, 348819, G09G 104, H01J 2906, H01J 152
Patent
active
057010617
ABSTRACT:
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.
REFERENCES:
patent: 5151635 (1992-09-01), Cappels
patent: 5198729 (1993-03-01), Powell
patent: 5218270 (1993-06-01), Haapakoski
patent: 5231332 (1993-07-01), Beaumont et al.
patent: 5243262 (1993-09-01), Moen
patent: 5260626 (1993-11-01), Takase et al.
patent: 5357166 (1994-10-01), Sugahara et al.
Cancellation of ELF/VLF Electric Fields form CRt Displays, R.D. Cappels, Apple Computer, Inc., Santa Clara, CA., SID 92 Digest, pp. 137-140.
Fukuma Kouji
Furuya Minoru
Kitou Kouji
Majima Kazuo
Obara Masao
Hitachi , Ltd.
Hitachi Mizusawa
Issing Gregory C.
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