Spark gap and discharge path arrangement for a television...

Details Spark gap and discharge path arrangement for a television... Spark gap and discharge path arrangement for a television...

H - Electricity

01

J

317/18, 350/79

H01J 29/02 (2006.01) H04N 5/68 (2006.01) H04N 9/20 (2006.01)

Patent

CA 1065961

Abstract of the Disclosure A spark gap arrangement is provided ior a television image reproducing system including a television picture tube having a relatively high voltage focus electrode and relatively low voltage cathode, screen grid and control grid electrodes. Spark gaps are respectively coupled between the electrodes and a reference potential to discharge energy deveoped at thc electrodes when undesirable arcing occurs between the electrodes which might otherwise cause damage to respective portlons of the signal processing system coupled to the electrodes. Separate relatively low impedance paths for conducting discharge currents produced in the spark gaps are coupled to the spark ?ap associated with the relatively high voltage focus electrode and the spark gaps associated with the relatively low voltage cathode, screen grid and control grid electrodes to substantlally prevent arc discharge currents associated with the focus electrode from being coupled to the cathode, screen grid and control grid electrodes through the spark gaps associated with the relatively low voltage elec- trodes themselves. In addition, the spark gaps are designed to inhibit excessively high voltages developed at the focus electrode from discharglng to adJacent electrodes, thereby circumventing the purpose of the separate discharge path arrangement, rather than through the associated spark gap. -1-

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