Deflection yoke apparatus with auxiliar coils to compensensate m

Details Deflection yoke apparatus with auxiliar coils to compensensate m Deflection yoke apparatus with auxiliar coils to compensensate m

1994-03-14

1995-07-11

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

315 85, 315 8, 348820, 361150, H01H 100, H01J 2906, H01J 152, H01F 1300

Patent

active

054324920

ABSTRACT:
A deflection yoke apparatus has a pair of horizontal and a pair of vertical deflection coils, a coil separator therebetween, and a funnel-shaped deflection core which provides a magnetic path for magnetic flux generated by the deflection coils. A pair of auxiliary coils are arranged at diametrically opposed positions outside the deflection core, and may be energized by the horizontal deflection current supplied to the horizontal deflection coils. The magnetic field generated by the auxiliary coils at least partially compensates the external magnetic leakage field which is radiated outside the deflection core by the horizontal deflection coils. The auxiliary coils have rod-shaped magnetic cores which are in magnetic flux coupling relationship with the smaller end of the deflection core. Leakage flux compensation is thereby achieved with minimal affect on the deflection fields and with low power dissipation in the auxiliary coils.

REFERENCES:
patent: 4554488 (1985-11-01), Kobayashi
patent: 4704564 (1987-11-01), Ito
patent: 4853588 (1989-08-01), Ohtsu
patent: 4947083 (1990-08-01), Bosch et al.
patent: 5017900 (1991-05-01), Ura
patent: 5036250 (1991-07-01), Sluyterman
patent: 5049847 (1991-09-01), Okuyama
patent: 5124613 (1992-06-01), Park
patent: 5138290 (1992-08-01), Togane

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