Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2011-01-04
2011-01-04
Budd, Mark (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S31300R
Reexamination Certificate
active
07863801
ABSTRACT:
An acoustic wave device includes a piezoelectric substrate, IDT electrodes, temperature characteristic-improving layer, and frequency-adjusting layer arranged on the piezoelectric substrate in that order. The piezoelectric substrate has a negative temperature coefficient of frequency TCF. The temperature characteristic-improving layer is made of a material having a positive temperature coefficient of frequency TCF. The frequency-adjusting layer includes a glass thin-film having a velocity of transverse wave less than a velocity of transverse wave of the temperature characteristic-improving layer.
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Budd Mark
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
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