Circuit for stabilizing electron beam focusing of an electromagn

Details Circuit for stabilizing electron beam focusing of an electromagn Circuit for stabilizing electron beam focusing of an electromagn

1978-09-13

1980-04-15

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 31TV, H01J 2958

Patent

active

041985923

ABSTRACT:
A circuit for stabilizing electron beam focusing is used for an electromagnetic focusing type camera tube having a high voltage generating circuit for supplying electrodes of the camera tube. A focusing current is supplied to an electron beam focusing coil of the camera tube. The focusing current supply circuit comprises an operational amplifier having an output terminal to which the focusing coil is connected. A detection resistor is connected between the focusing coil and an inverting input terminal of the operational amplifier. A first resistor is connected between the voltage source and a non-inverting input terminal of the operational amplifier. A second resistor is connected between a reference voltage source and the non-inverting input terminal of the operational amplifier.

REFERENCES:
patent: 3422305 (1969-01-01), Infante
patent: 3772566 (1973-11-01), Schwartz
patent: 3924156 (1975-12-01), Doran et al.

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