| 摘要 |
To perform highly precise position adjustment for head restraint in short time regardless of distance between head restraint and human body and head shape. Head restraint position adjusting device 100 includes capacitance sensor unit 10 and drive motor unit 30. Capacitance sensor unit 10 includes first and third sensing electrodes 11 and 13 and detection circuit 20. First sensing electrode 11 is arranged in an upper portion of front portion of head restraint 43 and senses capacitance between itself and vicinity of parietal region 49a of head 49 of human body 48. Third sensing electrode 13 is arranged in lower portion of front portion and senses capacitance between itself and any portion of human body 48 other than vicinity of parietal region 49a. When head restraint 43 moves from initial condition, detection circuit 20 detects position of parietal region 49a of head 49 (parietal region position) and determines appropriate position of head restraint 43 for head 49, enabling highly precise position adjustment in short time.
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