HEAD REST DEVICE FOR VEHICLE
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
When moving a head rest front portion in a full-open position direction, an ECU determines that the head rest front portion comes close to an occupant head portion on the basis of a detection result of an electrostatic capacitance sensor so as to stop the head rest front portion, 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 a reference electrostatic capacitance value of the electrostatic capacitance sensor. Alternatively, the ECU determines that the head rest front portion comes close to the occupant head portion on the basis of a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor.
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Citations
28 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 19)
- A head rest device for a vehicle comprising;
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8-18. -18. (canceled)
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20. :
- 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 determines that the head rest front portion comes close to the occupant head portion on the basis of a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor, wherein the control means is structured such as to detect that the head rest front portion comes close to the occupant head portion at a time when the change amount of the electrostatic capacitance value per unit time of the electrostatic capacitance sensor gets over a predetermined threshold value on the basis of an actuating speed of the drive means.
- A head rest device for a vehicle comprising;
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21. :
- 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 determines that the head rest front portion comes close to the occupant head portion on the basis of a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor, wherein the drive means is provided with a mechanical stroke detecting means detecting a mechanical stroke of the head rest front portion, and the control means determines that the head rest front portion comes close to the occupant head portion at a time when a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor per a predetermined interval detected by the mechanical stroke detecting means gets over a predetermined threshold value.
- A head rest device for a vehicle comprising;
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22. :
- 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 determines that the head rest front portion comes close to the occupant head portion on the basis of a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor, wherein the control means determines that the head rest front portion comes close to the occupant head portion at a time when a ratio of change amounts of the electrostatic capacitance value per unit time of the electrostatic capacitance sensor at a plurality of different times gets over a predetermined threshold value.
- A head rest device for a vehicle comprising;
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23. :
- 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 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 a reference electrostatic capacitance value which is set by an electrostatic capacitance value of the electrostatic capacitance sensor at a predetermined timing and is changeable in accordance with the timing, and a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor. - View Dependent Claims (24, 25, 26, 27)
- A head rest device for a vehicle comprising;
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28. :
- 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 determines that the head rest front portion comes close to the occupant head portion on the basis of a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor, wherein the control means is provided with an electrostatic capacitance sensor circuit determining an electrostatic capacitance value of the electrostatic capacitance sensor, a memory storing a threshold value used for determining the approach between the head rest front portion and the occupant head portion, and a central processing unit determining that the head rest front portion comes close to the occupant head portion on the basis of the threshold value stored in the memory and a change amount of the electrostatic capacitance value of the electrostatic capacitance sensor.
- A head rest device for a vehicle comprising;
Specification