Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-05-09
2006-05-09
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S360000
Reexamination Certificate
active
07042133
ABSTRACT:
The invention miniaturizes a surface acoustic wave device on which a plurality of surface acoustic wave elements are disposed and connected together in parallel on a plate, and provides a good temperature characteristic in a wide temperature range. A surface acoustic wave device according to the invention includes a plurality of surface acoustic wave elements disposed on a main surface of a quartz plate cut out with a Euler angle at (0°, 113° to 135°, +/−(40 to 49)°). Surface acoustic waves have propagation directions “ψ” which are different each other. When the Euler angle is set at (0°, θ, ψ), it is possible to reduce differences in each propagation direction by setting each propagation angle so as to satisfy a formula: ψ=0.3295θ+3.3318°+/−1.125°. This makes it possible to decrease the angle among the surface acoustic wave elements, and thereby miniaturizes the surface acoustic wave elements.
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Dougherty Thomas M.
Seiko Epson Corporation
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