| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-ended tuning fork piezoelectric vibration piece that prevents excitation electrodes from electrically floating even when breaking of extraction electrodes for connecting among the excitation electrodes occurs.SOLUTION: A double-ended tuning fork piezoelectric vibration piece 10 includes: central end portion extraction electrodes connected from front surface excitation electrodes 54 and 62 or rear surface excitation electrodes 56 and 64 in a second region 30 interposed between a first region 28 and a third region 32 adjacent to base end portions 12 and 22 out of an excitation region divided into three regions to inner side surface excitation electrodes 42, 50, 74 and 82 and outer side surface excitation electrodes 44, 52, 76 and 84 in either the first region 28 or the third region 32; and end portion central extraction electrodes connected from front surface excitation electrodes 70 and 78 in the third region 32 or rear surface excitation electrodes 40 and 48 in the first region 28 to inner side surface excitation electrodes 58 and 66 and outer side surface excitation electrodes 60 and 68 in the second region 30. The double-ended tuning fork piezoelectric vibration piece 10 is configured so as to apply a voltage of a potential having reversed polarity to each of the excitation electrodes adjacent to one another. |
