Ultrasonic microphone

Claim 1

AN ULTRASONIC MICROPHONE COMPRISING A QUANDRANGULAR PIEZOELECTRIC PLATE HAVING A PAIR OF OPPOSED SQUARE FACES PROVIDED WITH ELECTRODES THEREON, A MOUNTING STRUCTURE FOR SAID PLATE INCLUDING A FIRST MEMBER OF ELECTRICALLY INSULATING MATERIAL HAVING A FLAT PORTION AND AN OPENING LOCATED CENTRALLY OF THE FLAT PORTION, THE PIEZOELECTRIC PLATE BEING DISPOSED WITHIN SAID FIRST MEMBER, SAID FIRST MEMBER OF THE FLAT PORTION OF SAID FIRST MEMBER, SAID FIRST MEMBER BEING PROVIDED WITH A FLANGE WALL EXTENDING FROM THE PERIMETER OF THE FLAT PORTION OF THE MEMBER, SAID MOUNTING STRUCTURE HAVING A SECOND MEMBER OF ELECTRICALLY CONDUCTING MATERIAL MOUNTED ON ONE SIDE OF THE FLAT PORTION OF THE FIRST MEMBER AND HAVING FOUR SPACED TIPS EXTENDING THEREFROM, EACH TIP TERMINATING IN ENGAGEMENT WITH THE SAME ELECTRODE OF THE PIEZOELECTRIC PLATE ADJACENT TO THE PERIMETER OF SAID PIEZOELECTRIC PLATE ADJACENT TO THE OF THE EDGES THEREOF, SAID MOUNTING STRUCTURE HAVING A SECOND MEMBER OF ELECTRICALLY CONDUCTING MATERIAL MOUNTED ON THE OTHER SIDE OF THE FLAT PORTION OF THE INSULATING MEMBER AND HAVING FOUR SPACED TIPS EXTENDING THEREFROM, EACH TIP ENGAGING THE SAME ELECTRODE OF THE PIEZOELECTRIC PLATE ON THE SIDE OF SAID PLATE OPPOSITE THE POINTS OF CONTACT OF THE TIPS OF THE SECOND MEMBER, WHEREBY THE PIEZOELECTRIC PLATE IS MOUNTED IN FIXED POSITION TO THE ELECMOUNTING STRUCTURE ALONG FOUR AXES NORMAL TO THE ELECTRODES THEREOF AND DISPOSED CENTRALLY OF THE FOUR EDGES THEREOF, SAID SECOND CONTACT MEMBER HAVING A PLURALITY OF PROTRUDING TABS EXTENDING THEREFROM, A DISC DISPOSED WITHIN THE FLANGE WALL OF THE FIRST MEMBER OF THE MOUNTING STRUCTURE IN ABUTMENT WALL OF THE TABS OF THE SECOND MEMBER, SAID DISC BEING OF ELECTRICALLY CONDUCTING MATERIAL AND FORMING WITH THE PIEZOELECTRIC PLAT EAND MOUNTING STRUCTURE A CAVITY HAVING A RESONANT FREQUENCY WITHIN THE RESPONSIVE RANGE OF FREQUENCIES OF THE MICROPHONE, A HOUSING DISPOSED ABOUT THE MOUNTING STRUCTURE HAVING AN OPENING CONFRONTING THE SECOND MEMBER OF THE MOUNTING STRUCTURE AND THE PIEZOELECTRIC PLATE, AND ELECTRICAL TERMINAL MEANS MOUNTED ON THE HOUSING HAVING A FIRST TERMINAL ELECTRICALLY CONNECTED TO THE SECOND MEMBER OF THE MOUNTING STRUCTURE AND A SECOND TERMINAL ELECTRICALLY CONNECTED TO THE THIRD MEMBER OF THE MOUNTING STRUCTURE.