The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 1993
Filed:
Feb. 07, 1992
Hannu A Haapakoski, Salo, FI;
Salcomp Oy, Salo, FI;
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.