| 摘要 |
A stirrer is for stirring a liquid retained in a vessel with a sonic wave. The stirrer includes a sonic wave generating unit and a drive control unit. The sonic wave generating unit includes plural sound generators each having a different resonance frequency, for emitting the sonic wave generated from the sound generator toward the liquid. The drive control unit switches the sound generator which generates the sonic wave to a specific sound generator among the plural sound generators by changing a frequency of a drive signal input to the sonic wave generating unit.
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