Television cameras

Details Television cameras Television cameras

H - Electricity

04

N

350/47

H04N 5/235 (2006.01)

Patent

CA 1172352

ABSTRACT OF THE DISCLOSURE A television carnera comprises a pick-up element, an iris, a variable gain amplifier for a picked-up signal, and first and second comparators to compare the video level of the picked-up signal to be supplied to a pick-up signal system following said the variable gain amplifier with first and second reference levels and respectively supply first and second compared output signals therefrom to the iris and to the variable gain amplifier for controlling them thereby to form first and second automatic control loops, whereby when the amount of light incident on said pick-up element is above a predetermined value, the first automatic control loop is actuated and when it is below the predetermined value, the second automatic control loop is actuated.

391451

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