Distance measurement device between headrest and head, distance measurement method between headrest and head, headrest position adjustment device, and headrest position adjustment method

摘要

The headrest position adjustment device 100 includes a distance measurement device 10 and a drive motor unit 30, and the distance measurement device 10 includes a plurality of detection electrodes 11 to 15 and a detection circuit 20. The detection circuit 20 includes a plurality of capacitance detection circuits 21 to 25 and an arithmetic processing circuit 28 that are connected to the detection electrodes 11 to 15 on a one-to-one basis, and the drive motor unit 30 includes a motor drive circuit, a drive motor, and the like. Is provided. The detection circuit 20 determines the difference between the capacitance value of the detection electrode having a maximum capacitance based on the detected capacitance value and the capacitance value of the detection electrode having a minimum capacitance. The value is calculated and the distance L between the electrode heads is measured. Based on the measurement result, the position adjustment operation of the headrest 43 is performed.