PIEZOELECTRIC ELECTROACOUSTIC TRANSDUCER AND ITS MANUFACTURING METHOD

摘要

PURPOSE: To provide a piezoelectric electroacoustic transducer with a stable frequency characteristics by applying an adhesive properly to fix a thin diaphragm to a case and of a conductive adhesive for electric connection between the diaphragm and the case so as to prevent distortion from occurring in the diaphragm. CONSTITUTION: The piezoelectric electroacoustic transducer employs a 1st adhesive 13 that is applied to the shortest path tying a piezoelectric diaphragm 1 and interconnections 11a, 12a to fix the piezoelectric diaphragm to the case between the internal connections 11a, 12a of the outer circumferential part and the terminal of the rectangular piezoelectric diaphragm 1 in tortuous vibration in a broadwise direction by applying an alternate signal between electrodes, a conductive adhesive 14 that is applied between the electrodes and the internal connections of the terminal of the piezoelectric diaphragm via an upper face of the 1st adhesive 13 while bypassing the shortest path tying the piezoelectric diaphragm and the internal connections so as to electrically connect the electrodes and the internal connections of the terminal of the piezoelectric diaphragm, and a 2nd adhesive 15 that seals a gap between the outer circumferential part of the piezoelectric diaphragm and the inner circumferential part of the case.