Patent ID: 8706360
Filing Date: 2014-04-22
Classification: B60N

Abstract:
1. A device for measuring a distance between a headrest and a head, comprising: at least three sensing electrodes provided in the headrest arranged on a seat of a vehicle, each sensing capacitance between a head of a human body sitting on the seat and the headrest; detecting means for detecting at least three capacitance values, each corresponding to the respective capacitances from the at least three sensing electrodes; calculating means for calculating, by using the at least three capacitance values detected by the detecting means and position information showing an arrangement position of each of the sensing electrodes in the headrest, a coordinate of each of the at least three capacitance values on a two-dimensional coordinate system, the two-dimensional coordinate system taking a position of the sensing electrode on x-axis and taking the capacitance value on y-axis, calculating a high-degree curve of at least three degree connecting continuously the calculated coordinate of each of the at least three capacitance values, by using a preset high-degree function of at least three degree, and calculating a highest-degree coefficient of the high-degree curve; and distance measuring means for determining a distance between the headrest and the head using the calculated highest-degree coefficient of the high-degree curve.