| 摘要 |
To automatically adjust the position of a headrest accurately with a simple configuration while preventing an unnecessary movement of the headrest, a headrest position adjusting device 100 includes a capacitance sensor unit 10 and a drive motor unit 30. The capacitance sensor unit 10 includes, for example, a plurality of sensing electrodes 11 to 15 and a detecting circuit 20. The detecting circuit 20 includes a plurality of capacitance sensing circuits 21 to 25 connected one-to-one to the sensing electrodes 11 to 15, and an arithmetic processing circuit 28. The drive motor unit 30 includes a motor driving circuit and a drive motor. The detecting circuit 20 judges whether or not the smallest capacitance value among detected capacitance values is equal to or larger than a predetermined threshold, performs a position adjusting operation for a headrest 43 when the smallest capacitance value is equal to or larger than the predetermined threshold, and stops the headrest 43 or moves the headrest 43 to a predetermined position when the smallest capacitance value is smaller than the predetermined threshold.
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