Toyo Communication Equipment Co., Ltd.

Kiyoshi Nakamura

Koichi Hirama

Yuji Miyazawa

Haruhiko Kotake

A unit for suppressing harmonic vibration of a lower order which does not have desired frequency in an overtone resonator consisting main electrodes and sub electrodes. Harmonic vibration of a lower order suppressing piezoelectric vibrator comprises main electrodes arranged on a piezoelectric substrate and sub electrodes arranged in the vicinity of the main electrodes with gaps provided therebetween. If the electric equivalent circuit of the resonator is expressed by a coupling circuit which connects in series a circuit, which connects in parallel a series resonance circuit by the sub electrodes and coupling capacity indicating that the main electrodes are coupled with the sub electrodes, to a series resonance circuit by the main electrodes, then their loop frequencies substantially coincide with each other.

Piezoelectric vibrator for suppressing harmonic vibrations of lower

A gas pressure sensor comprises a contour piezoelectric vibrator and the pressure of gas is detected by measuring an equivalent series resistance of the vibrator which is surrounded by the gas whose pressure is to be detected.

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Kouza-gun, Japan

Koichi Hirama