Head-to-disk separation detector

Claim 1

AN INDICATOR AND CONTROL CIRCUIT COMPRISING, A MAGNETIC RECORD MEMBER HAVING AN ELECTRICALLY CONDUCTIVE SURFACE, A MAGNETIC TRANSDUCER MEMBER HAVING AN ELECTRICALLY CONDUCTIVE SURFACE, SAID MEMBERS BEING ARRANGED WITH SAID ELECTRICALLY CONDUCTIVE SURFACES SEPARATED BY A DIELECTRIC AND BEING RELATIVELY MOVABLE TOWARD EACH OTHER TO A POSITION OF ELECTRICAL CONDUCTION, A SOURCE OF ELECTRICAL ENERGY ESTABLISHING A POTENTIAL DIFFERENCE BETWEEN SAID ELECTRICALLY CONDUCTIVE SURFACES THROUGH THE DIELECTRIC, AN ELECTRONIC CONTROL DEVICE OPERATIVE TO PROVIDE AN OUTPUT IN THE EVENT ELECTRICAL CONDUCTION IS ESTABLISHED THROUGH SAID ELECTRICALLY CONDUCTIVE SURFACES, INDICATOR MEANS FOR PROVIDING A SENSIBLE SIGNAL INDICATIVE OF SAID ELECTRICAL CONDUCTION, A FIRST BISTABLE CIRCUIT DEVICE NORMALLY IN ONE OF ITS STABLE STATES AND RESPONSIVE TO THE OUTPUT OF SAID ELECTRONIC CONTROL DEVICE FOR SWITCHING TO THE OTHER OF ITS STABLE STATES TO THEREBY ACTUATE SAID INDICATOR MEANS, CIRCUIT MEANS OPERABLE FOR EFFECTING A SEPARATION OF SAID MAGNETIC RECORD MEMBER AND SAID MAGNETIC TRANSDUCER MEMBER, A SECOND BISTABLE CIRCUIT DEVICE NORMALLY IN ONE OF ITS STABLE STATES AND ADAPTED TO BE SWITCHED TO ITS OTHER STABLE STATE TO OPERATE SAID CIRCUIT MEANS, DELAY MEANS ADAPTED TO BE ACTUATED BY THE OUTPUT OF SAID ELECTRONIC CONTROL DEVICE FOR PROVIDING A DELAYED SIGNAL A PREDETERMINED TIME AFTER SAID ELECTRICAL CONDUCTION OCCURS, AND A COINCIDENCE DETECTOR ARRANGED TO BE ACTUATED BY THE OUTPUT OF SAID ELECTRONIC CONTROL DEVICE AND SAID DELAYED SIGNAL FOR SWITCHING SAID SECOND BISTABLE CIRCUIT DEVICE.