Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing
Patent
1989-09-07
1991-02-26
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Pulse storing
315 85, 315370, 313430, H01J 2906
Patent
active
049964615
ABSTRACT:
A system for improving the operation of a cathode ray tube (CRT) is disclosed whereby interference caused by external magnetic fields is mitigated. The system comprises a CRT having a CRT magnetic shield housing and at least one electromagnetic field sensor disposed adjacent to the inner surface of the CRT housing. Sensors form to generate a reference magnetic field and to generate a sensor output signal in response to the detection of both the reference field and an external field as sensed within the housing. A bucking field coil drive circuit is provided in electrical communication with the field sensor, the drive circuit being operative to generate a bucking field coil drive signal responsive to the field sensor output signal. A bucking field coil is disposed circumferentially about the CRT and is driven by the bucking field coil drive signal. The bucking field coil generates a bucking electromagnetic field in opposition to the sensed external magnetic field, thereby opposing and reducing the degrading effects of the external magnetic field on the CRT display.
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Denson-Low Wanda K.
Dinh Son
Hughes Aircraft Company
LaRoche Eugene R.
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