ARC SUPPRESSION MEANS FOR TELEVISION CATHODE RAY TUBES

摘要

This disclosure depicts an arc-suppression cylinder for use in cathode ray tubes having an evacuated envelope including a faceplate and a funnel having on an internal surface an inner conductive coating for receiving a high-voltage charge. The cathode ray tube also has an electron gun and ancillary electrical circuits susceptible to damaging electrical arcing currents, and a getter used to capture residual gases in the evacuated envelope of the tube. The arc-suppresion cylinder is electrically resistive and is electrically connected in an electrical path between the inner conductive coating and a high voltage element of the gun, and its surface is physically exposed to a deposit of getter material when the getter is flashed. The arcsuppression cylinder includes shadowing barriers for shadowing at least portions of the exposed surface from a deposit of the getter material to prevent the creation of an electrically conductive shorting path capable of permitting an arc to bypass or substantially nullify the arc-suppression cylinder.