Phase detector and automatic apparatus utilizing said phase detector for performing a rotational mechanical adjustment to effect a phase coincidence

Claim 1

A PHASE COINCIDENCE DETECTOR FOR (1) PROVIDING AN OUTPUT SIGNAL AT ONE LEAD WHEN TWO PERIODIC INPUT SIGNALS ATTAIN PHASE COINCIDENCE, AND (2) PROVIDING AN OUTPUT SIGNAL AT ANOTHER LEAD WHEN THE PHASE OF A PREDETERMINED ONE OF SAID INPUT SIGNALS LEADS THE OTHER, COMPRISING: (A) MEANS FOR DERIVING RESPECTIVE PULSE TRAINS FROM SAID INPUT SIGNALS, SAID PULSE TRAINS HAVING THE SAME RELATIVE PHASES AS SAID INPUT SIGNALS, (B) TWO PULSE LENGTHENERS COUPLED TO SAID MEANS OF CLAUSE (A) FOR DERIVING LENTHENED PULSED FROM SAID PULSE TRAINS, (C) MEANS, RESPONSIVE TO SAID LENGTHENED PULSES, AND HAVING TWO OUTPUTS LEAD, FOR PROVIDING SIMULTANEOUS PULSES ON SAID TWO OUTPUT LEADS WHEN SAID LENGTHENED PULSED ARE IN PHASE COINCIDENCE, AND FOR PROVIDING PULSES ON A PREDETERMINED ONE ONLY OF SAID OUTPUT LEADS WHEN SAID PREDETERMINED ONE OF SAID INPUT SIGNALS LEADS THE OTHER, AND (D) AN AND GATE HAVING TWO INPUTS CONNECTED TO SAID TWO OUTPUTS LEADS WHEREBY SAID AND GATE WILL PROVIDE AN OUTPUT ONLY WHEN SAID INPUT SIGNALS ARE IN PHASE COINCIDENCE.