Closed loop bucking field system

Details Closed loop bucking field system Closed loop bucking field system

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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patent: 4864192 (1989-09-01), Buchwald et al.
patent: 4899082 (1990-02-01), Sands et al.
patent: 4922153 (1990-05-01), Kevius

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