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  Signal Current

Introduction to Signal Current

Just as the beam scans the target plate, the beam encounters dissimilar positive potentials on the side of the photo layer which faces the gun. Enough number of electrons from the beam is after that deposited on the photo layer surface to decrease the potential of each element in the direction of the Zero cathode potential.

The left over electrons, not deposited on the target, return back and are not employed in the vidicon. Though, the unexpected change in potential on each element, when the beam scans, results a current flow in the signal electrode circuit generating a changing voltage across the load resistance RL. Noticeably, the amplitude of current and % subsequent output voltage beyond RL are directly proportional to the light intensity differences on the scene. Note: because, a large current would origin a higher voltage drop across RL, the output voltage mainly negative for white areas. The video output voltage, which thus builds across the load resistance (50 K-ohms) is sufficient and does not require any image or signal multiplication like in an image orthicon. The output signal is additional amplified through conventional amplifiers; before it left the camera unit. This creates the vidicon a very much simpler picture tube.

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