Cathode-ray tube apparatus having a reduced leak of magnetic flu

Details Cathode-ray tube apparatus having a reduced leak of magnetic flu Cathode-ray tube apparatus having a reduced leak of magnetic flu

1993-05-21

1994-09-27

Pascal, Robert J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315 85, H01F 1300

Patent

active

053509730

ABSTRACT:
In a cathode-ray tube apparatus, a deflection yoke is provided on a funnel of a tube and a pair of closed loop coils are provided on a panel and the funnel of the tube at upper and lower sides, respectively. The deflection yoke generates effective magnetic fluxes in the tube and also generates ineffective magnetic fluxes as leakage magnetic fluxes outside of the tube. Some of the leakage magnetic fluxes pass through the coils so that currents are induced in the coils and the resulting induced magnetic fluxes compensate for the leakage magnetic fluxes. Thus, the leakage magnetic fluxes passing through a space in front of the tube are reduced by the compensating magnetic fluxes from the coils.

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