Piezoelectric vibrating piece and piezoelectric device

A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The piezoelectric substrate is formed in a flat plate shape and vibrates in a thickness-shear vibration mode. The excitation electrodes are disposed on respective both principal surfaces of the piezoelectri...

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Bibliographic Details
Main Authors TESHIMA, YOSHIRO, HIROTA, KAZUHIRO, KAGA, SHIGETAKA
Format Patent
LanguageChinese
English
Published 01.05.2018
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The piezoelectric substrate is formed in a flat plate shape and vibrates in a thickness-shear vibration mode. The excitation electrodes are disposed on respective both principal surfaces of the piezoelectric substrate. The excitation electrode includes a main thickness portion and an inclined portion. The main thickness portion has a constant thickness. The inclined portion is formed in a peripheral area of the main thickness portion. The inclined portion has a thickness that gradually decreases from a portion contacting the main thickness portion to an outermost periphery of the excitation electrode. An inclination width as a width of the inclined portion has a length that is equal to or more than 0.5 times and equal to or less than three times of a flexural wavelength. The flexural wavelength is a wavelength of a flexure vibration as an unnecessary vibration.
Bibliography:Application Number: TW20176136357