Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2011-01-25
2011-01-25
SanMartin, J. (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S31300R
Reexamination Certificate
active
07876020
ABSTRACT:
A boundary acoustic wave device is capable of reducing insertion loss and the absolute value of the temperature coefficient of frequency (TCF). The boundary acoustic wave device utilizes a boundary acoustic wave propagating along the interface between a piezoelectric substance and a dielectric substance. The piezoelectric substance has a negative temperature coefficient of frequency and the dielectric substance has a positive temperature coefficient of frequency. IDT electrodes include a first conductive layer arranged on a side of the piezoelectric substance, a third conductive layer arranged on a side of the dielectric substance, and a second conductive layer arranged between the first and third conductive layers and composed of a metal having a lower density than those of the first and third conductive layers or an alloy primarily containing the metal. If thicknesses of the first, second, and third conductive layers are H1, H2, and H3, and a period of the IDT electrodes is λ, 0.04λ<H1+H3<0.12λ, H1>0.009λ, H3>0.022λ, and 0.05λ<H2<0.16λ are satisfied.
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Official Communication issued in International Patent Application No. PCT/JP2008/053259, mailed on Apr. 15, 2008.
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
SanMartin J.
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