| 摘要 |
PROBLEM TO BE SOLVED: To obtain a potential sensor in which the adjustment of the timing or the like of a piezoelectric tuning fork is reduced and in which a stable vibration characteristic is obtained. SOLUTION: A detecting electrode 3 which is arranged so as to face the surface of a photoconductor drum 2, a piezoelectric tuning fork 4, a tuning-fork drive circuit 20 which drives the piezoelectric tuning fork 4, an impedance conversion circuit 21, a rectifying circuit 22 and a DC amplifier circuit 23 constitute this potential sensor 1 roughly. In this piezoelectric tuning fork 4, a piezoelectric vibrator 12a and a piezoelectric vibrator 12b are pasted respectively on both arm parts 4a, 4b whose lengths are different. The detecting electrode 3 is fixed, via an insulator 5, to the shorter-length arm part 4a at the piezoelectric tuning fork 4.
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