Pulse modulated automatic light control

Details Pulse modulated automatic light control Pulse modulated automatic light control

1978-07-13

1980-05-06

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 526

Patent

active

042020140

ABSTRACT:
A device for automatically controlling the intensity of light impinging on the face plate of a television camera includes a shutter which is operated through a pulse width modulator so as to be opened for a length of time which varies inversely with the intensity of light entering the imaging light path between the scene and the camera.

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