Device for measuring distance between headrest and head, method for measuring distance between headrest and head, headrest position adjusting device, and headrest position adjusting method
First Claim
1. A device for measuring a distance between a headrest and a head, 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 capacitance values which are based on the capacitances from the plurality of sensing electrodes; and
distance measuring means which measures an electrode-head distance indicating a distance between the headrest and the head, in accordance with detection results detected by the detecting circuit,wherein the distance measuring means obtains a plurality of capacitance values each sensed by corresponding one of the sensing electrodes, among the obtained plurality of capacitance values, determines the highest capacitance value and the lowest capacitance value, calculates a difference value between the highest capacitance value and the lowest capacitance value, and determines the electrode-head distance between the headrest and the head using the calculated difference value.
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Abstract
A headrest position adjusting device 100 includes a distance measuring device 10 and a drive motor unit 30. The distance measuring device 10 includes 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. Based on the detected capacitance values, the detecting circuit 20 calculates a difference value between a capacitance value of the sensing electrode which shows the largest capacitance value and the capacitance value of the sensing electrode which shows the lowest capacitance value, and thereby measures an electrode-head distance L. A position adjusting operation for a headrest 43 is performed based on the measurement result.
9 Citations
20 Claims
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1. A device for measuring a distance between a headrest and a head, 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 capacitance values which are based on the capacitances from the plurality of sensing electrodes; and distance measuring means which measures an electrode-head distance indicating a distance between the headrest and the head, in accordance with detection results detected by the detecting circuit, wherein the distance measuring means obtains a plurality of capacitance values each sensed by corresponding one of the sensing electrodes, among the obtained plurality of capacitance values, determines the highest capacitance value and the lowest capacitance value, calculates a difference value between the highest capacitance value and the lowest capacitance value, and determines the electrode-head distance between the headrest and the head using the calculated difference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19)
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11. A method for measuring a distance between a headrest and a head, 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 capacitance values which are based on the capacitances sensed in the sensing step; and a distance measuring step of measuring an electrode-head distance indicating a distance between the headrest and the head, in accordance with detection results detected in the detecting step, wherein the distance measuring step obtains a plurality of capacitance values each sensed by corresponding one of the sensing electrodes, among the obtained plurality of capacitance values, determines the highest capacitance value and the lowest capacitance value, calculates a difference value between the highest capacitance value and the lowest capacitance value, and determines the electrode-head distance between the headrest and the head using the calculated difference value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 20)
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Specification