AUTOMATIC POLARIZATION ADJUSTMENT SYSTEM OF COMPENSATED TUBE-IMAGE FOR CONDUCTING DISSIMILARITIES OF TUBE-IMAGE ELECTRON GUNS

摘要

THE INVENTION RELATES TO A DEVICE FOR AUTOMATIC POLARIZATION ADJUSTMENT IN A VIDEO SIGNAL PROCESSING SYSTEM INCLUDING AN IMAGE REPRODUCING DEVICE HAVING AN ELECTRON BARREL INCLUDING AN INTENSITY ADJUSTING ELECTRODE. /P P ACCORDING TO THE INVENTION, IT INCLUDES A MEANS 30 FOR DERIVING A V SIGNAL REPRESENTATIVE OF THE SIZE OF THE CURRENT OF THE BLACK IMAGE CONDUCTED BY THE ELECTRON BARREL DURING THE POLARIZATION ADJUSTMENT INTERVALS; MEANS 32, 34 FOR PRODUCING AN AUXILIARY SIGNAL V PROPORTIONAL TO THE POLARIZATION OF THE ELECTRON BARREL DURING IMAGE DELETION POLARIZATION TUNING INTERVALS; AN ADJUSTING MEANS 58 RESPONDING TO THE DRIFT SIGNAL AND THE AUXILIARY SIGNAL, TO DEVELOP A POLARIZATION ADJUSTMENT VOLTAGE AS A FUNCTION OF THE SIZES OF THE DRIFT SIGNAL AND OF THE AUXILIARY SIGNAL; A MEANS 20, 22 FOR APPLYING THE ADJUSTMENT SIGNAL TO THE IMAGE REPRODUCING DEVICE IN ORDER TO MAINTAIN A CORRECT LEVEL OF BLACK CONDUCTION. /P P THE INVENTION APPLIES IN PARTICULAR TO COLOR TELEVISION.