Electroacoustic transducers

Claim 1

THE IMPROVEMENT OF AN ELECTROACOUSTIC TRANSDUCER CHARACTERIZED BY ITS RELATIVELY THIN FORM FACTOR COMPRISING THE COMBINATION OF AN ELONGATED CASING OF A WIDTH SUBSTANTIALLY GREATER THAN ITS DEPTH, SAID CASING HAVING BOTTOM AND SIDE WALLS DEFINING A CAVITY THEREWITHIN, A BEAM OF BARIUM TITANATE MATERIAL POSITIONED WITHIN SAID CAVITY, SAID BEAM BEING FASTENED AT ONE END THEREOF TO SAID CASING SUCH THAT ITS REMOTE END IS FREE TO VIBRATE AT THE CENTER OF SAID CAVITY, A VIBRATABLE DIAPHRAGM COUPLED TO SAID REMOTE END OF THE BEAM AND POSITIONED IN SPACED RELATION TO SAID BEAM ADJACENT THE CAVITY OPENING OF THE CASING, SAID VIBRATABLE DIAPHRAGM COMPRISING A THIN SHEET OF FLEXIBLE, RESILIENT MATERIAL FORMING A WALL-TO-WALL PARTITION BETWEEN SAID COVER AND SAID BEAM, AND A THIN SHEET OF METALLIC MATERIAL POSITIONED ON SAID SHEET OF FLEXIBLE, RESILIENT MATERIAL, SAID SHEET OF METALLIC MATERIAL BEING OF LESSER DIMENSIONS THAN SAID SHEET OF FLEXIBLE, RESILIENT MATERIAL SO AS TO BE SUPPORTED BY THE LATTER, AND A COVER FOR THE CAVITY OPENING SUPPORTED BY THE SIDE WALLS OF SAID CASING IN SPACED RELATION TO SAID VIBRATABLE DIAPHRAGM, SAID COVER DIFINING A SOUND RECEIVING OPENING FOR PERMITTING SAID DIAPHRAGM AND SAID BEAM TO VIBRATE IN RESPONSE TO SOUND RECIEVED BY SAID TRANSDUCER TO PRODUCE CORRESPONDING ELECTRICAL SIGNALS.