Magnetic cancelling apparatus for color cathode-ray tube

Details Magnetic cancelling apparatus for color cathode-ray tube Magnetic cancelling apparatus for color cathode-ray tube

1989-10-26

1991-05-21

Pascal, Robert J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315370, 313437, H01J 2900

Patent

active

050178326

ABSTRACT:
A magnetic cancelling apparatus for a color cathode-ray tube which is to cancel external magnetic fields acting on the color cathode-ray tube, can prevent deterioration of the screen color purity. The apparatus includes a magnetic sensor for detecting a magnetic field in a predetermined direction acting on the cathode-ray tube. The output of the magnetic sensor is amplified and then fed to a cancelling coil, thereby permitting the screen purity to be kept in best condition even under change in direction of the external magnetic field such as the geomagnetism.

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