| 摘要 |
<p>A head rest position adjusting device 100 has a capacitance sensor unit 10 and a drive motor unit 30, and the capacitance sensor unit 10 has plural detection electrodes 11 to 15. Each detection electrode 11 to 15 are formed in a rectangular strip having a long side arranged in a width direction intersecting with a height direction of a head restraint 43 at the front face side thereof, and are arranged in such a way that the long sides are aligned along the height direction. A detection circuit 20 has plural capacitance detection circuits 21 to 25 connected to the detection electrodes 11 to 15, respectively, and an arithmetic processing circuit 28, and the drive motor unit 30 has a motor drive circuit and a drive motor. Even if the head restraint 43 is in an initial condition, the detection circuit 20 detects an estimated center position of a head 49 in the height direction or a detection electrode having the highest output as a reference position from detection signals from individual detection electrodes 11 to 15, and adjusts a position of the head restraint 43 relative to a seat 40 with reference to the reference position.</p> |
