Electric lamp and discharge devices: systems – With electromagnetic wave radiation preventing or shielding...
Patent
1992-02-19
1993-11-09
Mis, David
Electric lamp and discharge devices: systems
With electromagnetic wave radiation preventing or shielding...
H01J 152, H01J 502
Patent
active
052606260
ABSTRACT:
In order to eliminate any harmful influence due to electric field radiation on the human body, electric field radiation from a front surface of a cathode ray tube is reduced. A degaussing coil arranged in proximity to a peripheral edge of a front surface of a cathode ray tube is employed advantageously. The degaussing coil is supplied with a voltage which is opposite in polarity to an electric field radiated from the front surface of the cathode ray tube. The reverse polarity voltage is derived from an output signal obtained from an output signal of a horizontal deflection circuit by a flyback transformer and/or derived from a voltage obtained by phase-inverting an anode voltage fluctuating in vertical synchronization. After a degaussing operation is completed, relay contacts are opened on the basis of a timer-controlled relay switch, thereby completely cutting the connection between the degaussing coil and a degaussing power source generating an alternating current which is supplied to the degaussing coil for the degaussing operation.
REFERENCES:
patent: 4922153 (1990-05-01), Kevius
patent: 4996461 (1991-02-01), Bentley
patent: 5101139 (1992-03-01), Lechter
patent: 5107179 (1992-04-01), Vidovich
patent: 5151635 (1992-09-01), Cappels
Michihata Masatoshi
Nakashima Yoshiyuki
Sakai Yoshikazu
Takase Katsuhisa
Terada Masakazu
Mis David
Nanao Corporation
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