Projection television system

Claim 1

IN A PROJECTION SYSTEM INCLUDING A DEFORMABLE LIGHT MODULATION MEDIUM EXTENDING ACROSS AN ELECTRIC CHANGE DEPOSITION AREA AND MEANS FOR PRODUCING AN ELECTRON BEAM FOR DEPOSITION ELECTRIC CHARGE ON SAID DEFORMABLE MEDIUM IN SAID AREAS, MEANS FOR MOVING SAID MEDIUM TO ADVANCE DIFFERENT PORTIONS OF SAID MEDIUM INTO SAID AREA, MEANS FOR APPLYING A TRAIN OF WAVES OF VOLTAGE EACH HAVING A LONG INTERVAL OF INCREASING VOLTAGE AND A SHORT INTERVAL OF DECREASING VOLTAGE FOR PERIODICALLY DEFLECTING SAID BEAM ACROSS SAID AREA GRADUALLY FROM THE SIDE INTO WHICH SAID MEDIUM MOVES TO THE OPPOSITE SIDE THEREOF IN LINES SPACED FROM ONE ANOTHER IN A DIRECTION ORTHOGONAL TO THE DIRECTION OF SAID PERIODIC DEFLECTION, MEANS FOR MODULATING SAID BEAM DURING THE DEFLECTION TTHEREOF TO DEPOSIT ELECTRIC CHARGES ON SAID MEDIUM IN SAID AREA THEREBY PRODUCING CORRESPONDING LIGHT DEVIATING DEFORMATIONS THEREIN, A FIRST NETWORK INCLUDING A RESISTOR AND A CAPACITOR CONNECTED IN PARALLEL, A SECOND NETWORK INCLUDING ANOTHER RESISTOR AND ANOTHER CAPACITOR CONNECTED IN PARALLEL, SAID CAPACITORS HAVING DIFFERENT CAPCITANCES, SAID FIRST AND SECOND NETWORKS CONNECTED IN SERIES, MEANS FOR APPLYING A TRAIN OF ESSENTIALLY SQUARE PULSES OF VOLTAGE BETWEEN THE REMOTE ENDS OF SAID NETWORKS, EACH OF SAID PUULSES OCCURRING DURING A SHARPLY FALLING PORTION OF A RESPECTIVE WAVE, MEANS FOR DERIVING BETWEEN THE COMMON END AND ONE OF THE REMOTE ENDS OF SAID NETWORKS A SECOND TRAIN OF ESSENTIALLY SQUARE PULSES OF VOLTAGE AND A THRID TRAIN OF PULSES EACH OF SHORT DURATION AND OCCURRING ESSENTIALLY ON THE TERMINATION OF A RESPECTIVE PULSE OF SAID SECOND TRAIN MEANS FOR APPLYING SAID SECOND AND THIRD TRAIN OF PULSES TO SAID BEAM PRODUCING MEANS TO BLOCK CURRENT IN SAID BEAM DURING THE OCCURRENCE OF THE PULSES OF SAID SECOND TRAIN AND TO PASS CURRENT IN SAID BEAM DURING THE OCCURRENCE OF SAID SHORT PULSES TO DEPOSIT CHARGES OF A PREDETERMINED QUANTITY ON SAID MEDIUM IN CORRESPONDING PARTS OF EACH LINE OF DEFLECTION DURING THE OCCURRENCE OF SAID SHORT PULSES.