Tuning-fork-type bimorph piezoelectric vibrator and...

Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect

Reexamination Certificate

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C310S370000

Reexamination Certificate

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07900514

ABSTRACT:
A tuning-fork-type bimorph piezoelectric vibrator includes two piezoelectric bodies that are bonded together and have opposite polarization directions. An intermediate metal layer is disposed between bonding surfaces of the piezoelectric bodies. A first slit is arranged to define legs and a base of the tuning fork structure. Second slits are provided in a first principal surface having a front metal layer to define driving/detecting electrodes. The tuning-fork-type bimorph piezoelectric vibrator provides improved temperature characteristics of a detuning frequency by not including a back metal layer on a second principal surface at least in an area in which greater than a predetermined level of stress is applied during operation.

REFERENCES:
patent: 5794080 (1998-08-01), Watanabe et al.
patent: 6799461 (2004-10-01), Fujimoto et al.
patent: 2000-258164 (2000-09-01), None
patent: 2005-172542 (2005-06-01), None
Official Communication issued in International Patent Application No. PCT/JP2006/317324, mailed on Nov. 7, 2006.

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