Patent ID: 8878553
Filing Date: 2014-11-04
Classification: B60N,G01B

Abstract:
1. A device for measuring a distance between a headrest and a head, comprising: a plurality of sensing electrodes which are provided in a headrest provided on a seat of a vehicle for sensing capacitances between a head of a human body sitting on the seat and the headrest, the sensing electrodes being provided side by side along a height direction of the headrest; a detecting circuit which detects capacitance values which are based on the capacitances from the plurality of sensing electrodes; and distance measuring means which measures an electrode-head distance indicating a distance between the headrest and the head, in accordance with detection results detected by the detecting circuit, wherein the distance measuring means obtains a plurality of capacitance values each sensed by corresponding one of the sensing electrodes, among the obtained plurality of capacitance values, determines the highest capacitance value and the lowest capacitance value, calculates a difference value between the highest capacitance value and the lowest capacitance value, and determines the electrode-head distance between the headrest and the head using the calculated difference value.