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Passive VLF Magnetic Remedies

IP.com Disclosure Number: IPCOM000037897D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-30

Publishing Venue

IBM

Related People

Authors:
Dickerson, JA Pillsbury, TB [+details]

Abstract

There is a growing concern that very low-frequency (VLF) magnetic fields may have ill effects on human beings. A major source of VLF magnetic fields in display monitors comes from the high- voltage deflection system. In a video display terminal (VDT), the flyback transformer, part of the horizontal deflection and high voltage system that sweeps the electron beam across the face of the CRT, is a source of pulsed VLF magnetic fields. In addition, the deflection yoke and width coil can be significant contributors. Generally, maximum intensity of this field exists on the side or in the rear of the monitor in close proximity to the physical location of the flyback transformer. In some cases, the deflection yoke is the largest contributor. Thus, front- of-screen radiation will be of greater concern.