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

1975-02-06

1977-07-12

Budd, Mark O.

Electrical generator or motor structure

Educational or construction units or kits

310 86, 310 82, H01L 4104

Patent

active

040356728

ABSTRACT:
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 disposed adjacent the apex to prevent collapse of the diaphragm.

REFERENCES:
patent: 2242755 (1941-05-01), Pope
patent: 2444620 (1948-07-01), Williams et al.
patent: 2957954 (1960-10-01), Swinehart
patent: 3206558 (1965-09-01), Shoot
patent: 3277465 (1966-10-01), Potter
patent: 3283299 (1966-11-01), Savino
patent: 3360772 (1967-12-01), Massa
patent: 3548116 (1970-12-01), Schafft
patent: 3660602 (1972-05-01), Thompson
patent: 3701865 (1972-10-01), Carlson
patent: 3786202 (1974-01-01), Schafft
patent: 3833865 (1974-09-01), Palmer

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