EXPOSURE CONTROL CIRCUIT FOR AN ELECTRICALLY SHUTTERED IMAGE TUBE

摘要

In order to maintain an optimum image under varying light conditions for an electrically shuttered image tube, it is necessary to control the time that the electronic shutter is open. This is done in the instant disclosure by detecting the amount of photocathode current that flows after the shutter is opened, and closing the shutter when a predetermined amount of current has flowed.