Method of and apparatus for controlling amount of electron beam

Details Method of and apparatus for controlling amount of electron beam Method of and apparatus for controlling amount of electron beam

1974-03-07

1976-08-17

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

H01J 3126

Patent

active

039756572

ABSTRACT:
A method of and an apparatus for controlling the amount of the electron beam in a photoconduction type image pickup tube in which the signal corresponding to the return beam from the photoelectric conversion plane is detected, the detected signal is compared with a reference signal and amplified, and the resulting signal is applied to the scanning electron beam current control electrode. By appropriately determining a plurality of circuit constants the return beam can be maintained approximately at a constant value independently of the amount of light incident upon the photoelectric conversion plane.

REFERENCES:
patent: 2833957 (1958-05-01), Horowitz
patent: 2930929 (1960-03-01), Shelton
patent: 3440476 (1969-04-01), Crowell et al.
patent: 3617801 (1971-11-01), Hogan
patent: 3629499 (1971-12-01), Carlson
patent: 3646390 (1972-02-01), Silver et al.

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