Magnetic shield for video monitor yokes

Details Magnetic shield for video monitor yokes Magnetic shield for video monitor yokes

1991-11-12

1994-06-07

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

335212, H01H 100, H01H 500, H01F 100

Patent

active

053193326

ABSTRACT:
A yoke for a cathode ray tube has deflection coils and a plurality of trim magnets mounted thereon. A tubular shield of Mu-metal slides over the coil to suppress an electromagnetic field radiated therefrom. In one embodiment, the trim magnets are inside the shield so that it has to be removed in order to adjust the magnets. In another embodiment, the trim magnets are outside the shield, so that they may be adjusted without necessarily having to remove the shield. The shield greatly reduces outwardly directed electromagnetic radiation in the vicinity of the cathode ray tube which allegedly might produce a health hazard to an operator at a video monitor terminal.

REFERENCES:
patent: 2431077 (1947-11-01), Poch
patent: 2795717 (1957-06-01), Finkelstein et al.
patent: 3618125 (1971-11-01), Yabase
patent: 5194776 (1993-03-01), Chevalier

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