Beam current control circuit

H - Electricity – 01 – J

Patent

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355/26

H01J 29/98 (2006.01) H01J 31/20 (2006.01) H04N 5/228 (2006.01)

Patent

CA 1145056

ABSTRACT A beam current control circuit for a pick-up tube which operates with higher control electrode potential than cathode electrode potential. The circuit includes a control electrode potential control responsive to signals corresponding to the difference between an excess beam current and a reference signal and a signal generator whose output corresponds to the excess beam current based on a signal current, a cathode current and a control current of the pick-up tube.

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