Narrow-frequency band acoustic transducer

Details Narrow-frequency band acoustic transducer Narrow-frequency band acoustic transducer

H - Electricity

04

R

349/66

H04R 17/00 (2006.01) H04R 7/12 (2006.01) H04R 17/10 (2006.01)

Patent

CA 1166741

NARROW-FREQUENCY BAND ACOUSTIC TRANSDUCER ABSTRACT OF THE DISCLOSURE A narrow-frequency band, acoustic transducer of high conversion efficiency over a narrow-frequency band, which transducer comprises: a truncated diaphragm having a depressed, circular area and a peripheral edge about the circular area and a convex cap section extending out- wardly from the circular area; a vibration board adhesive- ly secured about the peripheral edge of the diaphragm, to couple acoustically the vibration board to the diaphragm on one side; and a piezoelectric element centrally secured to the other side of the vibration board, with electrical leads to the piezoelectric element, whereby electrical energy input to the piezoelectric element provides a high decibel acoustical output about the natural resonance fre- quency of the vibration board.

401737

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