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HEAD REST DEVICE FOR VEHICLE

  • US 20090096468A1
  • Filed: 11/10/2006
  • Published: 04/16/2009
  • Est. Priority Date: 11/17/2005
  • Status: Active Grant
First Claim
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1. :

  • A head rest device for a vehicle comprising;

    a head rest rear portion supported to a seat back;

    a head rest front portion movable forward and backward between a full-close position which is close to the head rest rear portion, and a full-open position which is away from the head rest rear portion;

    a drive means moving the head rest front portion;

    an electrostatic capacitance sensor provided in the head rest front portion and structured such that an electrostatic capacitance is changed in accordance with a fluctuation of the distance with respect to the occupant head portion; and

    a control means controlling the drive means and determining an approach between the head rest front portion and the occupant head portion on the basis of a detection result of the electrostatic capacitance sensor so as to stop the head rest front portion at a time of moving the head rest front portion in the full-open position direction,wherein the control means sets an electrostatic capacitance value of the electrostatic capacitance sensor at a predetermined timing to a reference electrostatic capacitance value which is changeable in correspondence to the timing, and determines that the head rest front portion comes close to the occupant head portion on the basis of an absolute capacitance change with respect to the reference electrostatic capacitance value.

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