Apparatus for reducing magnetic field radiated from deflection y

Details Apparatus for reducing magnetic field radiated from deflection y Apparatus for reducing magnetic field radiated from deflection y

1996-09-16

1998-04-28

Oen, William L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313440, 325210, 325213, H01J 3100

Patent

active

057449040

ABSTRACT:
An apparatus for reducing the leakage of the magnetic field from a deflection yoke without consumption of additional energy is provided. The apparatus includes a first circuit and a second circuit. The first circuit substantially loops around the upper portion of the funnel shaped C.R.T., defining a first space, and is connected to the ground reference. When the upper magnetic field generated from the deflection yoke passes through the first space, a first current of eddy current type is generated within the first circuit which, in turn, results in heat whereby the leakage of the magnetic field is reduced. The second circuit substantially loops around the lower portion of the funnel shaped C.R.T., defining a second space, and is connected to the ground reference. When the lower magnetic field generated from the deflection yoke passes through the second space, a second current of eddy current type is generated within the second circuit which, in turn, results in heat whereby the leakage of the magnetic field is reduced.

REFERENCES:
patent: 3240985 (1966-03-01), Ammerman et al.
patent: 4494097 (1985-01-01), Lenders
patent: 4922153 (1990-05-01), Kevius
patent: 5170094 (1992-12-01), Giannantonio et al.
patent: 5200673 (1993-04-01), Hishiki

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