Method and a coupling for decreasing the detrimental radiation c

Details Method and a coupling for decreasing the detrimental radiation c Method and a coupling for decreasing the detrimental radiation c

1992-02-07

1993-06-08

Mis, David

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315 1, 315399, 361146, H01J 502

Patent

active

052182703

ABSTRACT:
The object of the disclosure is a method and a coupling for decreasing the alternating current field produced by a cathode-ray tube in the environment. The said field or radiation is at least partly due to the capacitances (C1, C2) of the anode (A) with respect, on one hand, to the deflection coil (DY) and, on the other hand, to the ground. These capacitances produce, mainly because of the return pulse of the deflection coupling, a line rate noise voltage to the anode. According to the invention, a back-off voltage (U.sub.2) opposite to the noise voltage is fed to the anode (A) of the tube either directly or via a graphitizing (G). In cases where the same high-voltage transformer (TR) functions for both the high voltage of the anode and the horizontal deflection, the winding (L) of this transformer can also be used in generating the back-off voltage (U.sub.2). The back-off voltage can thus be coupled to the anode (A) via the high-voltage capacitor (C3) of the transformer.

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