Monostable circuits for suppression of cathode ray beam when deflection voltages or currents fail

Claim 1

A CIRCUIT ARRANGEMENT INCLUDING, A CATHODE RAY TUBE, A CONTROL MEANS FOR SAID TUBE, MEANS FOR DEFLECTING THE CATHODE RAY BEAM OF SAID TUBE, A SAW-TOOTH WAVE GENERATOR GENERATING A SAW-TOOTH WAVE HAVING A DEFLECTION PORTION AND A FLY-BACK PORTION, MEANS COUPLING SAID SAW-TOOTH WAVE GENERATOR TO SAID BEAM DEFLECTING MEANS, A MONOSTABLE CIRCUIT HAVING A PERIOD LONGER THAN THAT OF SAID SAW-TOOTH WAVE AND PRODUCING A BEAM-CONTROL VOLTAGE WHEN IN ITS STABLE CONDITION, MEANS COUPLING SAID MONOSTABLE CIRCUIT TO SAID CONTROL MEANS AND THUS APPLYING SAID CONTROL VOLTAGE TO SAID CONTROL MEANS TO RENDER THE CATHODE RAY BEAM INNOCUOUS TO THE SCREEN OF THE SAID CATHODE RAY TUBE, A GENERATING MEANS FOR GENERATING FIRST AND SECOND TRIGGERING PULSES OCCURRING SUBSTANTIALLY AT THE BEGINNING AND END RESPECTIVELY OF SAID FLY-BACK PORTION OF SAID SAW-TOOTH WAVE, MEANS FOR APPLYING SAID SECOND TRIGGERING PULSES TO SAID MONOSTABLE CIRCUIT TO TRIGGER IT FROM ITS STABLE CONDITION TO A QUASI-STABLE CONDITION, AND FOR APPLYING SAID FIRST TRIGGERING PULSES TO SAID MONOSTABLE CIRCUIT TO TRIGGER IT FROM ITS QUASI-STABLE CONDITION TO ITS STABLE CONDITION.