Automatic beam control circuit responsive to ambient light leve

Details Automatic beam control circuit responsive to ambient light leve Automatic beam control circuit responsive to ambient light leve

1978-07-10

1979-04-24

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358219, H04N 904, H04N 534

Patent

active

041515528

ABSTRACT:
An image pickup apparatus provided with a circuit for taking the maximum one of the three signal currents out of three photoconductive pickup tubes and a circuit for obtaining the difference of the maximum signal current from a current proportional to one of the cathode currents of the three pickup tubes, wherein the voltages at the beam control electrodes of the three pickup tubes are controlled together by the voltage signal corresponding to the difference current so that the resolutions of the pickup tubes are improved and that the scanning beam control circuit is simplified.

REFERENCES:
patent: 3988776 (1976-10-01), Shinozaki et al.

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