Method and apparatus for reducing the intensity of magnetic field emissions from video display units
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United States of America Patent
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Oct 1, 1996
Issued Date -
N/A
app pub date -
Sep 14, 1994
filing date -
May 10, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for the reduction of the intensity of magnetic field emissions from video display units (VDU) in the vicinity of the user comprising a wire coil shaped to mimic the shape of conventional VDU deflection coils draped over a VDU to produce a cancelling magnetic field synchronous with the magnetic field produced by the unit's deflection coil. The cancellation coil is driven by a signature sensor disposed forward of the deflection coil that senses the characteristics of the magnetic field produced by the deflection coil. The gain of the cancellation coil is adjusted to maximize the cancellation coil's cancellation effect in the vicinity of the VDU user.
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