Patent ID: 7794012
Filing Date: 2010-09-14
Classification: B60N

Abstract:
1. A backrest with head support for a vehicle seat, comprising: a substantially upright backrest; a head support mounted in the backrest and adjustable in height to an end position with respect to the backrest; at least two capacitive proximity sensors arranged in the head support for detecting the position of the head of a person sitting in the vehicle seat in relation to the head support; and an indicator responsive to proximity signals from the proximity sensors dependent on the proximity of the person's head to the headrest; wherein each proximity sensor comprises an electrode in the head support that generates an electric field, wherein each proximity sensor detects a distinct capacitance of its electrode in relation to the head, and wherein the two proximity sensors produce an indication of the position of the head support with respect to the head as a function of said detected distinct capacitances.