Television horizontal scanning circuit utilizing controlled rectifiers

Claim 1

IN A SOLID STATE HORIZONTAL SCANNING CIRCUIT FOR A TELEVISION RECEIVER OR THE LIKE HAVING, A SOURCE OF DIRECT CURRENT, A HORIZONTAL SCANNING YOKE COIL, A RESONATING CAPACITOR CONNECTED IN CIRCUIT WITH SAID COIL, AND A BIDIRECTIONAL CURRENT SWITCH CONNECTED IN SERIES WITH SAID COIL AND SAID SOURCE TO BE PERIODICALLY CLOSED TO CLAMP SAID COIL TO SAID SOURCE DURING PASSAGE OF OSCILLATING TRACE CURRENT THROUGH SAID COIL FROM A HIGH VALUE OF ONE POLARITY TO A HIGH VALUE OF THE OTHER POLARITY AND TO BE PERIODICALLY OPENED DURING PASSAGE OF OSCILLATING RETRACE CURRENT THROUGH SAID COIL FROM THE HIGH VALUE OF OTHER POLARITY TO THE HIGH VALUE OF THE ONE POLARITY, THE BI-DIRECTIONAL SWITCH COMPRISING, A SOLID STATE CONTROLLED RECTIFIER AND A DIODE CONNECTED IN PARALLEL AND WITH REVERSE POLARITY TO EACH OTHER, GATING PULSE MEANS CONNECTED TO SAID CONTROLLED RECTIFIER TO ENABLE SAID RECTIFIER TO BECOME CONDUCTIVE ONLY DURING PASSAGE OF TRACE CURRENT THROUGH SAID COIL, A RESONANT CIRCUIT OPERATIVE TO STORE ENERGY WHEN RETRACE CURRENT FLOWS THROUGH SAID COIL AND TO OSCILLATE DURING PASSAGE OF TRACE CURRENT THROUGH SAID COIL, AND MEANS CONNECTING SAID RESONANT CIRCUIT AND SAID PARALLEL CONNECTED DIODE AND RECTIFIER TO APPLY THE OSCILLATING CURRENT THERETO TO CAUSE SAID DIODE TO BECOME CONDUCTIVE AT LEAST ONCE DURING THE FLOW OF TRACE CURRENT THROUGH SAID COIL AND TO ENABLE SAID RECTIFIER TO BECOME NON-CONDUCTIVE WHENEVER SAID DIODE BECOMES CONDUCTIVE BY REDUCING THE CURRENT FLOW THROUGH SAID RECTIFIER BELOW ITS HOLDING CURRENT VALUE, THE FREQUENCY AND PHASE OF OSCILLATION OF SAID RESONANT CIRCUIT BEING DETERMINED TO ENABLE SAID DIODE TO CHANGE FROM CONDUCTIVE TO NON-CONDUCTIVE STATE AS THE CURRENT THROUGH SAID COIL REACHES THE HIGH VALUE TO OTHER POLARITY AT THE END OF THE FLOW OR TRACE CURRENT THROUGH SAID COIL WHEREBY BOTH SAID RECTIFIER AND SAID DIODE REMAIN NON-CONDUCTIVE DURING THE FLOW OF RETRACE CURRENT IN SAID COIL AND SAID RESONANT CIRCUIT.