Apparatus for shielding an electric field of very low fraq³ência emitted from the front face of a cathode ray tube (CTR) in a video display apparatus.

摘要

"Apparatus for shielding an electric field of very low frequency emitting from the front face of a cathode ray tube (CRT) in a display device vu00ecdeo".The present invention relates to a device for shielding an electric field of very low frequ00b3u00eancia emitted from the front face of a cathode ray tube (CRT) in an apparatus for exiBiu00e7u00e3o video.The apparatus comprises: a signal detection device.Connected to the processor for feedback to the detection of a voltage applied to the anode of the CRT anode; a device for inversion and amplification to invert and amplify the voltage of the anodeDetected by the detection device of signal; a device for forming wave shape to conform to the form of signal wave pulse of negative polarity induced from the coilInduction; a signal synthesizing device for synthesizing the signal pulse of negative polarity is fed as input from the device forming waveform with a signal DAnd out of the device of inversion and amplification device; an amplifier for amplifying the signal output of a pulse of negative polarity synthesized fed as input from the disposal.Sitivo of synthesizing signal; and a loop antenna open, mounted on a predetermined portion of the CRT.In order to radiate the signal pulse of negative polarity synthesized fed as input from the amplifier device output.The VLF electric field generated from the CRT is cancelled by the electric field caused by the pulse of negative polarity synthesized irradiated through the loop antenna open.