Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2008-05-20
2008-05-20
Dougherty, Thomas M (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S354000
Reexamination Certificate
active
11785290
ABSTRACT:
[Problems]To provide a surface acoustic wave excitation device for efficiently exciting the surface acoustic wave on the surface of a material such as glass having free size and shape for making mechanical vibration available.[Means to Solve the Problems]The surface acoustic wave excitation device according to the present invention comprises a non-piezoelectric member30such as glass, a piezoelectric member20, interdigital transducers11interposed between the non-piezoelectric member30and the piezoelectric member20, and pre-pressurizing means42for pressing the piezoelectric member20onto the non-piezoelectric member30by way of the interdigital transducers. Alternating voltage is applied to the interdigital transducers11for exciting the surface acoustic wave on the non-piezoelectric member30. Standing waves are generated in the piezoelectric member20by applying alternating voltage to the interdigital transducers11, thereby allowing alternating strains to propagate to the non-piezoelectric member30such as a glass substrate or the like by way of the electrodes11and exciting the surface acoustic wave for making mechanical vibration of the non-piezoelectric member30available.
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Dougherty Thomas M
National University Corporation Saitama University
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