HEADREST POSITION ADJUSTMENT DEVICE AND HEADREST POSITION ADJUSTMENT METHOD

摘要

A headrest position adjustment device can highly accurately adjust the position of a headrest in a short time independently of the distance between the headrest and a human body and of the shape of the head. The headrest position adjustment device (100) has a capacitance sensor section (10) and a drive motor section (30).The capacitance sensor section (10) has first and third detection electrodes (11, 13) and a detection circuit (20). The first detection electrode (11) is placed at the upper part on the front surface side of the headrest (43) and detects the capacitance between itself and the vicinity of the head top (49a) of the head (49) of the human body (48). The third detection electrode (13) is placed at the lower part on the front surface side of the headrest and detects the capacitance between itself and those portions of the human body (48) which are other than the vicinity of the head top (49a). When the headrest (43) moves from an initial state, the detection circuit (20) detects the position of the head top (49a)(head top position) of the head (49) and determines the optimum position of the headrest (43) relative to the head (49). As a result, the position of the headrest is highly accurately adjusted in a short time.