CRT magnetic field cancelling device

Details CRT magnetic field cancelling device CRT magnetic field cancelling device

1991-12-30

1993-05-04

Mis, David

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

361146, H01J 502

Patent

active

052085104

ABSTRACT:
A stray magnetic field cancelling device for a cathode ray tube comprises an elongated member of adjustable length composed of at least two magnetizable metal plates in slidable relationship enveloped by an electromagnetic coil. The device is physically isolated from the yoke a distance effective to exert minimum effect on the yoke deflection fields. Also, the device is oriented transversely to the centerline of the cathode ray tube so as to generate a cancelling magnetic field in opposed relationship with, and transverse to, the stray magnetic field. A simple mechanical adjustment provides for adapting the device to CRTs of varying sizes.

REFERENCES:
patent: 4709220 (1987-11-01), Sakane
patent: 4943753 (1990-07-01), Hevesi
patent: 4992697 (1991-02-01), Penninga et al.
Test Methods for Visual Display Units, MPR 1990:8 1990-12-01 IEEE Working Group P-1140 on Standard for Measurement of Electromagnetic Near Fields (5HZ -30MHz) Nov. 9, 1990.

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