Piezoelectric transducer and components therefor

Details Piezoelectric transducer and components therefor Piezoelectric transducer and components therefor

1986-07-29

1988-03-01

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, 310800, H01L 4108

Patent

active

047288442

ABSTRACT:
A piezoelectric transducer comprising a casing having an opening in one face and a piezoelectric element extending across the opening has a casing containing a backing material in direct contact with the piezoelectric element. The backing material comprises a polymeric composition which may contain a heavy metal oxide, e.g. BiO, or a metal, e.g. Ni, in particulate form, and/or may contain particles of a material of lower specific gravity than the surrounding composition, the distribution of said particles being such that they are most concentrated in a region remote from the piezoelectric element and are least concentrated or essentially absent in the region immediately adjacent the piezoelectric element.

REFERENCES:
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patent: 3546012 (1970-12-01), Dixon et al.
patent: 3789656 (1974-02-01), Miller
patent: 4240004 (1980-12-01), Coleman
patent: 4297607 (1981-10-01), Lynnworth et al.
patent: 4373401 (1983-02-01), Baumoel
patent: 4381470 (1983-04-01), Leach et al.
patent: 4430593 (1984-02-01), Gohlert et al.
patent: 4523122 (1985-06-01), Tone et al.
patent: 4528652 (1985-07-01), Horner et al.
patent: 4571520 (1986-02-01), Saito et al.

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