System for producing magnetization patterns upon a magnetic recording medium

Claim 1

APPARATUS COMPRISING A FIRST BLOCKING OSCILLATOR INCLUDING A FIRST UNILATERALLY-CONDUCTING AMPLIFYING DEVICE HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, FIRST BIASING MEANS COUPLED TO SAID FIRST DEVICE FOR RENDERING SAID FIRST DEVICE NORMALLY CUTOFF, A FIRST TRANSFORMER HAVING FIRST, SECOND AND THIRD WINDINGS, FIRST TIME CONSTANT MEANS HAVING A GIVEN TIME CONSTANT, SAID FIRST WINDING OF SAID FIRST TRANSFORMER BEING COUPLED TO THE OUTPUT CIRCUIT OF SAID FIRST DEVICE, SAID SECOND WINDING OF SAID FIRST TRANSFORMER BEING COUPLED TO THE INPUT CIRCUIT OF SAID FIRST DEVICE THROUGH SAID FIRST TIME CONSTANT MEANS, SAID SECOND WINDING OF SAID FIRST TRANSFORMER BEING POLED WITH RESPECT TO SAID FIRST WINDING THEREOF TO PROVIDE POSITIVE FEEDBACK BETWEEN THE OUTPUT AND INPUT CIRCUITS OF SAID FIRST DEVICE, WHEREBY A FIRST OUTPUT PULSE OF GIVEN ABSOLUT AMPLITUDE AND GIVEN DURATION IS INDUCED IN SAID THIRD WINDING OF SAID FIRST TRANSFORMER IN RESPONSE TO A TRIGGER PULSE OF GIVEN POLARITY BEING APPLIED TO SAID INPUT CIRCUIT OF SAID FIRST DEVICE, ONE END OF SAID THIRD WINDING OF SAID FIRST TRANSFORMER BEING CONNECTED TO A POINT OF REFERENCE POTENTIAL AND SAID THIRD WINDING OF SAID FIRST TRANSFORMER BEING POLED WITH RESPECT TO SAID FIRST AND SECOND WINDINGS THEREOF TO PROVIDE A PREDETERMINED POLARITY FOR SAID FIRST OUTPUT PULSE APPEARING AT THE OTHER END OF SAID THIRD WINDING OF SAID FIRST TRANSFORMER; A SECOND BLOCKIN OSCILLATOR INCLUDING A SECOND UNILATERALLY-CONDUCTING AMPLIFYING DEVICE HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, SECOND BIASING MEANS COUPLED TO SAID SECOND DEVICE FOR RENDERING SAID SECOND DEVICE NORMALY CUTOFF, A SECOND TRANSFORMER HAVING FIRST, SECOND AND THIRD WINDINGS, SECOND TIME CONSTANT MEANS HAVING SAID GIVEN TIME CONSTANT, SAID FIRST WINDING OF SAID SECOND TRANSFORMER BEING COUPLED TO THE OUTPUT CIRCUIT OF SAID SECOND DEVICE, SAID SECOND WINDING OF SAID SECOND TRANSFORMER BEING COUPLED TO THE INPUT CIRCUIT OF SAID SECOND DEVICE THROUGH SAID SECOND TIME CONSTANT MEANS, SAID SECOND WINDING OF SAID SECOND TRANSFORMER BEING POLED WITH RESPECT TO THE FIRST WINDING THEREOF TO PROVIDE POSITIVE FEEDBACK BETWEEN THE OUTPUT AND INPUT CIRCUITS OF SAID SECOND DEVICE WHEREBY A SECOND OUTPUT PULSE OF SAID GIVEN ABSOLUTE AMPLITUDE AND SAID GIVEN DURATION IS INDUCED IN SAID THIRD WINDING OF SAID SECOND TRANSFORMER IN RESPONSE TO A TRIGGER PULSE OF SAID GIVEN POLARITY BEING APPLIED TO SAID INPUT CIRCUIT OF SAID SECOND DEVICE, ONE END OF SAID THIRD WINDING OF SAID SECOND TRANSFORMER BEING CONNECTED TO SAID POINT OF REFERENCE POTENTIAL AND SAID THIRD WINDING OF SAID SECOND TRANSFORMER BEING POLED WITH RESPECT TO SAID FIRST AND SECOND WINDINGS THEREOF TO PROVIDE A POLARITY OPPOSITE TO SAID PREDETERMINED POLARITY FOR SAID SECOND OUTPUT PULSE APPEARING AT THE OTHER END OF SAID THIRD WINDING OF SAID SECOND TRANSFORMER; SAID OTHER ENDS OF SAID THIRD WINDINGS OF SAID FIRST AND SECOND TRANSFORMER BEING CONNECTED TO EACH OTHER; LOAD MEANS HAVING ONE END THEREOF CONNECTED TO SAID POINT OF REFERENCE POTENTIAL AND THE OTHER END THEREOF CONNECTED TO SAID OTHER ENDS OF SAID THIRD WINDINGS OF SAID FIRST AND SECOND TRANSFORMERS, AND MEANS FOR SELECTIVELY APPLYING SAID TRIGGER PULSE OF GIVEN POLARITY TO THE INPUT CIRCUIT OF SAID FIRST DEVICE OR THE INPUT CIRCUIT OF SAID SECOND DEVICE, SAID GIVEN TIME CONSTANT BEING SUFFICIENT TO PROVIDE A RECOVERY TIME INTERVAL FOR EACH OF SAID FIRST AND SECOND BLOCKING OSCILLATORS WHICH IS GREATER THAN TWICE SAID GIVEN DURATION.