Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-06-22
2008-07-29
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
07405512
ABSTRACT:
An acoustic transducer comprises a ferroelectric crystal having a plurality of spaced apart ferroelectric domain inverted regions and at least one non-inverted region. An electrode layer is disposed on one side of the crystal electrically contacting both the domain inverted portion and the non-inverted portion of the crystal. On a side of the crystal opposite the electrode layer, a first electrode is disposed on the domain inverted portion spaced apart from a second electrode disposed on the non-inverted portion. As a result, the acoustic transducer provides sub-transducers hooked in series having effective areas defined by the areas of their respective electrodes.
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Darby & Darby
Dougherty Thomas M.
Gooch and Housego PLC
Jetter Neil R.
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