Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1988-12-27
1990-12-04
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313421, 335214, 315 85, H01J 2906
Patent
active
049756184
ABSTRACT:
In a color picture tube apparatus, a deflection unit is provided around a color picture tube and a leakage magnetic is generated from the deflection unit. A metal cover made of aluminum, which covers an electrical power source is located in a space to which leakage magnetic field is reached and a first opposition magnetic field is generated from the metal cover due to the leakage magnetic field which produces an eddy current in the metal cover. A metal plate made of a conductive and non-magnetic material is so located between the deflection unit and the metal cover as to be substantially perpendicular to the metal cover. Thus, a second opposition magnetic field is so generated from the metal plate due to the leakage magnetic field as to substantially cancel the first opposition magnetic field.
REFERENCES:
patent: 3349271 (1967-10-01), Harkensee
patent: 4677344 (1987-06-01), Toshiyasu et al.
patent: 4728915 (1988-03-01), Konosu et al.
Patent Abstracts of Japan, vol. 10 No. 32 (E-379) (2089), Feb. 7, 1986, Nippon Victor K.K. "Deflection York
Journal of Applied Physics, vol. 44, No. 8 Aug. 1873, pp. 3766-3769 G. A. Wardly, "Correction of Eddy Current . . .".
Koba Hiroyuki
Okamoto Hisakazu
DeMeo Palmer C.
Kabushiki Kaisha Toshiba
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