Ultrasonic transducer with temperature stability due to selected

Details Ultrasonic transducer with temperature stability due to selected Ultrasonic transducer with temperature stability due to selected

1977-11-25

1979-08-07

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

29 2535, 310312, 310334, H01L 4110

Patent

active

041639170

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.

REFERENCES:
patent: 3239696 (1966-03-01), Burkhalter et al.
patent: 3376438 (1968-04-01), Colbert
patent: 3387149 (1968-06-01), Young
patent: 3821834 (1974-07-01), McElroy
patent: 3890423 (1975-06-01), Zacharias, Jr.
patent: 4006371 (1977-02-01), Quirke

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