Electrical transmission or interconnection systems – Anti-induction or coupling to other systems – Magnetic or electrostatic field control
Patent
1994-09-14
1996-10-01
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Anti-induction or coupling to other systems
Magnetic or electrostatic field control
315 8, H01J 2906
Patent
active
055613330
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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Becker Jeffrey M.
Elms Richard T.
MTI, Inc.
Shoop Jr. William M.
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