Invention Grant
- Patent Title: Tuning-fork-type bimorph piezoelectric vibrator and vibrating gyroscope module including the vibrator
- Patent Title (中): 调音叉型双压电振动器和包括振动器的振动陀螺仪模块
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Application No.: US12212772Application Date: 2008-09-18
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Publication No.: US07900514B2Publication Date: 2011-03-08
- Inventor: Haruyoshi Kurakawa
- Applicant: Haruyoshi Kurakawa
- Applicant Address: JP Kyoto
- Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee: Murata Manufacturing Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Keating & Bennett, LLP
- Priority: JP2006-122325 20060426
- Main IPC: G01P9/04
- IPC: G01P9/04

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.
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