| 摘要 |
A piezoelectric vibrator 2 that generates an electric charge according to a stress and a weight 1 provided on the piezoelectric vibrator 2 are included. The piezoelectric vibrator 2 has multiple pairs of sensing electrodes 3 a and 3 b, and 4 a and 4 b, and the sensing electrodes 3 a and 3 b, and 4 a and 4 b are respectively connected in parallel so that capacitances Cd 1 and Cd 2 made of the sensing electrodes may be connected in parallel. It is thus possible to double the charge sensitivity with keeping the voltage sensitivity.
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