Display unit with reduced leakage magnetic field

Details Display unit with reduced leakage magnetic field Display unit with reduced leakage magnetic field

1998-11-05

2000-11-14

Vu, David

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315 8, H01J 2956

Patent

active

061474541

ABSTRACT:
A display unit that enables reduction in number of additional parts, decrease in leakage magnetic field in a VLF band generated from the display unit in all directions at low cost, and suppression of the leakage magnetic field to the specified value or less according to MPR-II Standard with tolerance is provided. The display unit comprises a cathode-ray tube having a neck portion, a deflection yoke 2 that is mounted at a predetermined position on a periphery of the neck portion, and a driving circuit 3 that has a coil 4 and drives the deflection yoke 2. The driving circuit 3 (the coil 4) is provided at such a position and in such a direction that a magnetic field E.sub.2 generated from the driving circuit 3 (the coil 4) cancels out a leakage magnetic field generated E.sub.1 from the deflection yoke 2 substantially at the position in front of and 50 cm away from the center of a face panel of the cathode-ray tube.

REFERENCES:
patent: 5049847 (1991-09-01), Okuyama et al.
patent: 5317239 (1994-05-01), Ohguro et al.
patent: 5432492 (1995-07-01), Meershoek
Patent Abstracts of Japan, publication No. 05190115 A, published Jul. 30, 1993.
Patent Abstracts of Japan, publication No. 06176714 A, published Jun. 24, 1994.

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