Transistor field time base deflection circuit

Claim 1

A DEFLECTION CIRCUIT FOR PRODUCING A SAWTOOTH CURRENT HAVING A STROKE PERIOD AND A FLYBACK PERIOD IN A DEFLECTION COIL COMPRISING, A TRANSISTOR AMPLIFIER OUTPUT STAGE HAVING AN INPUT AND AN OUTPUT ELECTRODE, A CHARGE NETWORK INCLUDING A CAPACITOR FOR DERIVING A SAWTOOTH DRIVE VOLTAGE FOR SAID OUTPUT STAGE, A DISCHARGE CIRCUIT CONNECTED ACROSS SAID CAPACITOR COMPRISING A SEMICONDUCTOR SWITCHING ELEMENT FOR PERIODICALLY DISCHARGING SAID CAPACITOR DURING THE FLYBACK PERIOD TO A RESIDUAL VOLTAGE LEVEL EQUAL TO THE VOLTAGE DROP ACROSS SAID DISCHARGE CIRCUIT AT THE END OF THE FLYBACK PERIOD, MEANS PROVIDING A DIRECT-CURRENT CONNECTION FROM SAID CHARGE NETWORK TO SAID TRANSISTOR INPUT ELECTRODE FOR SUPPLYING SAID SAWTOOTH VOLTAGE THERETO, WINDING MEANS SERIALLY CONNECTED IN SAID DISCHARGE CIRCUIT, MEANS FOR INDUCING A FLYBACK VOLTAGE PULSE IN SAID WINDING MEANS HAVING AN AMPLITUDE AND POLARITY TO CANCEL AT LEAST A PORTION OF SAID RESIDUAL VOLTAGE DURING TO FLYBACK PERIOD, SAID DISCHARGE CIRCUIT COMPRISING MEANS PROVIDING A DIRECT-CURRENT CONNECTION BETWEEN SAID DISCHARGE CIRCUIT AND SAID CHARGE NETWORK WHEREBY SAID TRANSISTOR INPUT ELECTRODE IS CLAMPED TO A VOLTAGE LEVEL AT THE BEGINNING OF A STROKE PERIOD WHICH IS LESS THAN SAID RESIDUAL VOLTAGE LEVEL, AND MEANS FOR COUPLING SAID DEFLECTION COIL TO SAID TRANSISTOR OUTPUT ELECTRODE.