Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing
Patent
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.
Mitsubishi Denki Kaisha Kaisha
Pascal Robert J.
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