Apparatus for suppressing electric field radiation from a cathode ray tube
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United States of America Patent
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Apr 11, 2000
Issued Date -
N/A
app pub date -
May 27, 1998
filing date -
Nov 15, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An anode ripple voltage waveform is detected by a capacitor built into a flyback transformer. The detected waveform is then phased by a phasing circuit, amplitude adjusted by an amplitude adjusting circuit and subsequently delivered to an addition circuit. A horizontal component is detected by a horizontal output transformer, then phase adjusted by a phasing circuit and subsequently amplitude adjusted by an amplitude adjusting circuit. Thereafter, the horizontal component is added to the anode ripple component by the addition circuit, inverted and amplified by an inverting amplifier, and then supplied to an antenna arranged in proximity to the cathode ray tube. Thus, electric fields radiated from the face of the cathode ray tube are suppressed.
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