Acoustic wave device

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

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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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Official Communication issued in corresponding German Patent Application No. 11 2007 001 259, mailed on Feb. 2, 2010.
Official Communication issued in International Patent Application No. PCT/JP2007/059835, mailed on Jul. 31, 2007.

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