Metal working – Piezoelectric device making
Patent
1975-03-20
1977-04-05
Hall, Carl E.
Metal working
Piezoelectric device making
29525, 29593, 310 82, 310 94, H01L 4122
Patent
active
040153193
ABSTRACT:
An ultrasonic transducer and a method for manufacture thereof in which a piezoelectric crystal is bonded to a flat diaphragm with the neutral bending 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 crystal 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.
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Bindicator Company
Hall Carl E.
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