Headrest position adjusting device and headrest position adjusting method
First Claim
1. A headrest position adjusting device, 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 a height position of the head based on sensing signals from the plurality of sensing electrodes; and
position adjusting means which adjusts a position of the headrest with respect to the head based on the height position of the head in accordance with a detection result from the detecting circuit;
wherein the detecting circuit determines whether a distance between the headrest and the head is equal to or shorter than a predetermined threshold distance, andwherein the position adjusting means adjusts the position of the headrest when the distance between the headrest and the head is determined equal to or shorter than the predetermined threshold distance, and stops the headrest or moves the headrest to a predetermined position when the distance between the headrest and the head is determined longer than the predetermined threshold distance.
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Accused Products
Abstract
To automatically adjust the position of a headrest accurately with a simple configuration while preventing an unnecessary movement of the headrest, a headrest position adjusting device 100 includes a capacitance sensor unit 10 and a drive motor unit 30. The capacitance sensor unit 10 includes, for example, a plurality of sensing electrodes 11 to 15 and a detecting circuit 20. The detecting circuit 20 includes a plurality of capacitance sensing circuits 21 to 25 connected one-to-one to the sensing electrodes 11 to 15, and an arithmetic processing circuit 28. The drive motor unit 30 includes a motor driving circuit and a drive motor. The detecting circuit 20 judges whether or not the smallest capacitance value among detected capacitance values is equal to or larger than a predetermined threshold, performs a position adjusting operation for a headrest 43 when the smallest capacitance value is equal to or larger than the predetermined threshold, and stops the headrest 43 or moves the headrest 43 to a predetermined position when the smallest capacitance value is smaller than the predetermined threshold.
9 Citations
9 Claims
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1. A headrest position adjusting device, comprising:
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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 a height position of the head based on sensing signals from the plurality of sensing electrodes; and position adjusting means which adjusts a position of the headrest with respect to the head based on the height position of the head in accordance with a detection result from the detecting circuit; wherein the detecting circuit determines whether a distance between the headrest and the head is equal to or shorter than a predetermined threshold distance, and wherein the position adjusting means adjusts the position of the headrest when the distance between the headrest and the head is determined equal to or shorter than the predetermined threshold distance, and stops the headrest or moves the headrest to a predetermined position when the distance between the headrest and the head is determined longer than the predetermined threshold distance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A headrest position adjusting method, comprising:
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a sensing step of sensing capacitances between a head of a human body sitting on a seat of a vehicle and a headrest provided on the seat by means of a plurality of sensing electrodes which are provided in the headrest side by side along a height direction of the headrest; a detecting step of detecting a height position of the head based on sensing signals sensed in the sensing step; and a position adjusting step of adjusting a position of the headrest with respect to the head based on the height position of the head in accordance with a detection result detected in the detecting step, wherein the detecting step determines whether a distance between the headrest and the head is equal to or shorter than a predetermined threshold distance, and wherein the position adjusting step adjusts the position of the headrest when the distance between the headrest and the head is determined equal to or shorter than the predetermined threshold distance, and stops the headrest or moves the headrest to a predetermined position when the distance between the headrest and the head is determined longer than the predetermined threshold distance. - View Dependent Claims (8, 9)
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Specification