Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2005-09-06
2005-09-06
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S31300R
Reexamination Certificate
active
06940208
ABSTRACT:
A surface acoustic wave device includes a ZnO dielectric thin film on a quartz substrate and an IDT electrode having strips between the ZnO thin film and the quartz substrate. The IDT electrode has at least one region where the strips are disposed at an interval defined by approximately a half-wavelength of the surface acoustic wave. The duty ratio of the IDT electrode is preferably more than about 0.5. Alternatively, a protrusion is formed via a slope in the region of the ZnO thin film where the IDT electrode is disposed, and the inclination angle θ of the slope is more than about 30°.
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Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
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