Ultrasonic transducer and a method for manufacture thereof

Details Ultrasonic transducer and a method for manufacture thereof Ultrasonic transducer and a method for manufacture thereof

H - Electricity

04

R

356/200, 349/67.

H04R 17/10 (2006.01) B06B 1/06 (2006.01) G01F 23/296 (2006.01) H01L 41/08 (2006.01) H04R 31/00 (2006.01)

Patent

CA 1071322

Abstract An ultrasonic transducer and a method for manufacture thereof in which a piezoelectric crystal is bonded to a flat diaphragm with the neutral ben- ding axis of the crystal/diaphragm combination being within the bonding agent. The diaphragm is then pressed into the open end of a hollow shell. The resonant frequency of the shell, diaphragm and cry- stal combination is determined by the extent to which the diaphragm is pressed into the shell and, in the preferred example disclosed, is set at about 19.8 KHz. The shell cavity is then filled with a mixture of RTV and a nonconductive particulate material at a weight ratio between 5/1 and 20/1. This mixture lowers the Q of the transducer while also raising its resonant frequency to the desired 20 KHZ. --- 0 ---

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