Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reissue Patent
2008-02-08
2010-12-28
SanMartin, J. (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S320000, C310S335000
Reissue Patent
active
RE042009
ABSTRACT:
A piezoelectric resonator of the present invention is structured such that on a substrate5having a cavity4formed therein, a lower electrode3,a piezoelectric body1,a spurious component control layer16,and an upper electrode2are formed in this order from bottom up. The spurious component control layer16is a layer for controlling a spurious frequency, and composed of, for example, a metallic material, a dielectric material, or a piezo electric material. By additionally providing the spurious component control layer16,it is made possible to cause variation of the spurious frequency due to unwanted variation to become greater than variation in resonance frequency of the main resonance of the piezoelectric resonator. Thus, it is possible to realize a piezoelectric resonator having an admittance frequency response where no spurious component occurs between resonance frequency fr and antiresonance frequency fa.
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Nakamura Hiroyuki
Nakatsuka Hiroshi
Onishi Keiji
Yamakawa Takehiko
Panasonic Corporation
SanMartin J.
Wenderoth , Lind & Ponack, L.L.P.
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