Closed loop bucking field system

Details Closed loop bucking field system Closed loop bucking field system

Category

H - Electricity

Subcategory

01

Subsubcategory

J

CPC

355/3

IPC codes

H01J 29/98 (2006.01) H01J 29/00 (2006.01) H04N 9/29 (2006.01)

Type

Patent

Patent number

CA 2022162

Description

Abstract of the Disclosure 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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