Acoustic transducer with a dual purpose piezoelectric element

Details Acoustic transducer with a dual purpose piezoelectric element Acoustic transducer with a dual purpose piezoelectric element

H - Electricity

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349/67.6

H04R 17/00 (2006.01) H01L 41/04 (2006.01) H01L 41/08 (2006.01) H04R 3/00 (2006.01)

Patent

CA 1074003

428 CANADA ACOUSTIC TRANSDUCER WITH A DUAL PURPOSE PIEZOELECTRIC ELEMENT Abstract of the Disclosure An acoustic transducer having a piezoelectric element secured to a conical diaphragm with the piezoelectric element forming part of a relaxation oscillator circuit. The piezoelectric element performs the dual function of firstly developing acoustic energy and transferring such energy to the diaphragm and secondly functioning as an electronic component in the oscillator circuit by operating as a frequency determining capacitor in such circuit. The diaphragm and the piezoelectric element are enclosed in a housing. Portions of the housing are deformed and penetrate the base of the diaphragm for securing the diaphragm to the housing. A post integral with the housing extends inwardly from the base toward the apex of the diaphragm and one end of the post is dis- posed adjacent the apex to prevent collapse of the diaphragm.

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