| 摘要 |
A piezoelectric plate is formed in a configuration defined by four sides, each pair of two adjacent sides defining an angle of each corner. In the case where the piezoelectric plate is configured as a rectangle or a parallelogram, two opposit sides have the same longer length, while the remaining opposite two sides have the same shorter length. For the purpose of suppressing a spurious vibration, the side ratio of the shorter side to the longer side is selected to be 0.7 to 0.98 in the range where no influence is exerted upon a vibration of the fundamental wave.
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