Resonator, unit having resonator, oscillator having unit and...

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

Reexamination Certificate

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Reexamination Certificate

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07342352

ABSTRACT:
A resonator comprises a base portion and a plurality of vibrational arms connected to the base portion and vibratable in a flexural mode. An electrode is disposed on at least one of opposite side surfaces of each of the vibrational arms so that a capacitance ratio r1of a fundamental mode of vibration of the resonator is less than a capacitance ratio r2of a second overtone mode of vibration thereof. A groove is formed in at least one of opposite main surfaces of each of the vibrational arms, and at least one mounting arm protrudes from the base portion.

REFERENCES:
patent: 4205248 (1980-05-01), Negita
patent: 4384232 (1983-05-01), Debely
patent: 6587009 (2003-07-01), Kitamura et al.

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