Beam current control for television camera

Details Beam current control for television camera Beam current control for television camera

1982-01-18

1984-04-03

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358219, H04N 534

Patent

active

044411227

ABSTRACT:
A television camera comprising a control circuit for controlling the electron beam current intensity in a pick-up tube which has a current-controlled electron gun, for example a diode gun. The control circuit comprises a controllable current source an output of which is connected to the anode of the diode gun, which anode acts as a control electrode, and a control input of which is coupled to a pick-up tube output for producing a picture signal. In order to obtain a dynamic additional focussing of the electron beam when an electrostatic focussing means is employed the cathode of the electron gun is connected to a voltage source via a, for example, variable resistor.

REFERENCES:
patent: 2174580 (1939-10-01), Hergenrother
patent: 2396023 (1946-03-01), Schantz
patent: 2571306 (1951-10-01), Szegho
patent: 3708617 (1973-01-01), Caraba
patent: 3831056 (1974-08-01), Bazin
patent: 3931466 (1976-01-01), Van Den Berg
patent: 4037133 (1977-07-01), Sennik
patent: 4161755 (1979-07-01), Haendle

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