H - Electricity – 01 – J
Patent
H - Electricity
01
J
338/18, 355/3, 3
H01J 23/16 (2006.01) H01J 29/96 (2006.01)
Patent
CA 1109565
ABSTRACT OF THE DISCLOSURE This disclosure depicts a television cathode ray tube including an evacuated glass envelope having on an external surface of a funnel portion thereof an outer con- ductive coating and on an internal surface thereof an inner conductive coating for receiving a high voltage charge. The tube has an electron gun located in a neck of the funnel. The tube is characterized by having an arc-suppression and static- elimination system comprising a discrete, non-distributed arc suppression resistor having a relatively low stray capacitance and having a dynamic impedance value in the range of a few kilohms to tens of megohms, and means for electrically and mechanically coupling said arc suppression resistor between said inner conductive coating and said electron gun, and in electrically parallel combination with said arc suppression resistor, an anti- static coating deposited on an inner surface of the neck around the beam egress from said gun and having a dynamic impedance value which is greater than that of said arc suppression resistor such that said resistor carries the major part of any arc currents flowing through said system, whereby effective arc suppression and static elimination are achieved with high dynamic impedance and with an insubstantial likelihood of said system being by-passed as a result of stray capacitance in the neck region of the tube.
301637
Retsky Michael W.
Schwartz James W.
Macrae & Co.
Zenith Radio Corporation
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