Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1992-05-28
1993-03-30
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367159, 310334, 310337, 310369, H04R 1700
Patent
active
051990040
ABSTRACT:
A radially-polarized piezoelectric cylindrical transducer is provided. The ransducer has an electrically conductive end cap affixed with a conductive epoxy to one end of a piezoelectric body and a second cap affixed to the other end. The piezoelectric body comprises a layer of piezoelectric material located between an inner and an outer electrode. The outer electrode has an electrode gap which electrically insulates the end cap from the outer electrode. The unit is electrically conductive and permits the attachment of two electrical leads to its exterior, one to the first end cap and the other to the outer electrode of the piezoelectric body. In an alternative embodiment, two conductive end caps are affixed with conductive epoxy to opposite ends of the piezoelectric body. In this embodiment, the inner electrode has an electrode gap which electrically insulates the second end cap from the inner electrode. One electrical lead attaches to each end cap in this alternative embodiment. An electrical signal sent through the piezoelectric transducer causes the walls of the cylinder to vibrate. Alternatively, pressure variations surrounding the transducer generate an electrical signal within the piezoelectric material of the transducer.
REFERENCES:
patent: 3716828 (1973-02-01), Massa
patent: 3835340 (1974-09-01), Schildkraut
patent: 4782470 (1988-11-01), Poturnicki, Jr. et al.
patent: 4821244 (1989-04-01), Wood
patent: 4866683 (1989-09-01), Phillips
patent: 4933919 (1990-06-01), Geil et al.
Eldred J. Woodrow
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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