HEADREST POSITION ADJUSTMENT DEVICE AND HEADREST POSITION ADJUSTMENT METHOD
First Claim
1. A headrest position adjustment device, comprising:
- a headrest which is set behind a head of a person sitting on a seat;
a plurality of sensing electrodes which are provided side by side along a height direction of the headrest and which sense capacitance between the head of the person and the headrest;
a detecting circuit which detects a height position of the head with respect to the headrest based on values of capacitances sensed by the plurality of sensing electrodes respectively; and
position adjusting means which adjusts an upward/downward-direction position of the headrest based on a detection result of the detecting circuit,wherein when a distance between the headrest and the head is within a certain range, the detecting circuit calculates an estimated center position of the head based on the values of capacitances sensed by the plurality of sensing electrodes, and based on a calculated value, detects the height position of the head with respect to the headrest, andwhen the distance between the headrest and the head is not within the certain range, the detecting circuit detects the height position of the head with respect to the headrest based on a ratio between the values of capacitances sensed by at least the sensing electrode located at an uppermost position and the sensing electrode located at a lowermost position among the plurality of sensing electrodes.
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Accused Products
Abstract
To highly precisely adjust a position of a headrest automatically and to an appropriate condition with simple configuration, when the distance between the headrest and .a head is within a certain range, a detecting circuit of a headrest position adjustment device calculates an estimated height-direction center position of the head based on sensing signals from a plurality of sensing electrodes. Based on the calculated value, the detecting circuit detects the height position of the head. When the distance between the headrest and the head is not within the certain range, the detecting circuit detects the height position of the head based on sensing signals from at least the sensing electrode located at a lowermost position and the sensing electrode located at an uppermost position among the plurality of sensing electrodes.
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Citations
19 Claims
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1. A headrest position adjustment device, comprising:
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a headrest which is set behind a head of a person sitting on a seat; a plurality of sensing electrodes which are provided side by side along a height direction of the headrest and which sense capacitance between the head of the person and the headrest; a detecting circuit which detects a height position of the head with respect to the headrest based on values of capacitances sensed by the plurality of sensing electrodes respectively; and position adjusting means which adjusts an upward/downward-direction position of the headrest based on a detection result of the detecting circuit, wherein when a distance between the headrest and the head is within a certain range, the detecting circuit calculates an estimated center position of the head based on the values of capacitances sensed by the plurality of sensing electrodes, and based on a calculated value, detects the height position of the head with respect to the headrest, and when the distance between the headrest and the head is not within the certain range, the detecting circuit detects the height position of the head with respect to the headrest based on a ratio between the values of capacitances sensed by at least the sensing electrode located at an uppermost position and the sensing electrode located at a lowermost position among the plurality of sensing electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A headrest position adjustment method, comprising:
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sensing capacitance between a head of a person sitting on a seat and a headrest by a plurality of sensing electrodes which are arranged side by side along a height direction of the headrest; when a distance between the headrest and the head is within a certain range, calculating an estimated center position of the head based on values of capacitances sensed by the plurality of sensing electrodes respectively, and based on a calculated value, detecting a height position of the head with respect to the headrest; when the distance between the headrest and the head is not within the certain range, detecting the height position of the head with respect to the headrest based on a ratio between the values of capacitances sensed by at least the sensing electrode located at an uppermost position and the sensing electrode located at a lowermost position among the plurality of sensing electrodes; and adjusting an upward/downward-direction position of the headrest based on the detected height position of the head with respect to the headrest. - View Dependent Claims (18, 19)
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Specification