SENSING APPARATUS AND METHOD, AND PROGRAM THEREFOR
First Claim
1. A sensing apparatus comprising:
- a measurement section that measures capacitance of each of a plurality of first electric capacitors having unknown capacitance;
a plurality of contact sections that are electrically connected to the plurality of first electric capacitors and that a human body disposed proximally contacts directly or indirectly through an insulator;
a determination section that determines whether the human body has contacted the contact section either directly or indirectly based on a result of comparison between the capacitance of the plurality of first electric capacitors measured by the measurement section and a threshold value for each of the plurality of first electric capacitors;
a storage section that cumulatively stores a result of measurement for each of the plurality of first electric capacitors, the result of measurement being the result of measurement by the measurement section;
a reference capacitance calculation section that calculates reference capacitance for each of the plurality of first electric capacitors based on the result of measurement stored in the storage section;
a difference calculation section that calculates an absolute difference value between the reference capacitance for each of the plurality of first electric capacitors and the result of measurement measured by the measurement section for each of the plurality of first electric capacitors; and
an adjustment section that adjusts the threshold value for each of the plurality of first electric capacitors based on a sum of the absolute difference value calculated by the difference calculation section for each of the first electric capacitors other than the absolute difference value of each of the first electric capacitors.
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Accused Products
Abstract
Human contact/non-contact is detected speedily and accurately. A measurement section measures capacitance of each of sites to which a plurality of electrodes are connected where a human body touches, a comparison section compares the capacitance with a threshold value for each contacting electrode, and a control section determines whether a human body has come in contact based on the comparison result. A reference value calculation section calculates a reference value serving as electrode-specific reference capacitance based on the measurement results corresponding to the plurality of electrodes cumulatively stored in a storage section, a difference calculation section calculates an absolute difference value between the electrode-specific reference capacitance and a plurality of measurement results, and a threshold value adjustment section adjusts the threshold value by subtracting from the electrode-specific threshold value a value of the sum of the calculated absolute difference value for each of the electrodes other than the absolute difference value of each of the electrodes. The present invention can be applied to a touch sensor.
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Citations
11 Claims
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1. A sensing apparatus comprising:
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a measurement section that measures capacitance of each of a plurality of first electric capacitors having unknown capacitance; a plurality of contact sections that are electrically connected to the plurality of first electric capacitors and that a human body disposed proximally contacts directly or indirectly through an insulator; a determination section that determines whether the human body has contacted the contact section either directly or indirectly based on a result of comparison between the capacitance of the plurality of first electric capacitors measured by the measurement section and a threshold value for each of the plurality of first electric capacitors; a storage section that cumulatively stores a result of measurement for each of the plurality of first electric capacitors, the result of measurement being the result of measurement by the measurement section; a reference capacitance calculation section that calculates reference capacitance for each of the plurality of first electric capacitors based on the result of measurement stored in the storage section; a difference calculation section that calculates an absolute difference value between the reference capacitance for each of the plurality of first electric capacitors and the result of measurement measured by the measurement section for each of the plurality of first electric capacitors; and an adjustment section that adjusts the threshold value for each of the plurality of first electric capacitors based on a sum of the absolute difference value calculated by the difference calculation section for each of the first electric capacitors other than the absolute difference value of each of the first electric capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sensing method comprising:
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a measurement step of measuring capacitance of each of a plurality of first electric capacitors having unknown capacitance; a determination step of determining whether a human body has contacted a contact section either directly or indirectly based on a result of comparison between the capacitance of the plurality of first electric capacitors measured by a measurement section and a threshold value for each of the plurality of first electric capacitors; a storage step of cumulatively storing a result of measurement for each of the plurality of first electric capacitors, the result of measurement being the result of measurement through processing of the measurement step; a reference capacitance calculation step of calculating reference capacitance for each of the plurality of first electric capacitors based on the result of measurement stored through processing of the storage step; a difference calculation step of calculating an absolute difference value between the reference capacitance for each of the plurality of first electric capacitors and the result of measurement measured through processing of the measurement step for each of the plurality of first electric capacitors; and an adjustment step of adjusting the threshold value for each of the plurality of first electric capacitors based on a sum of the absolute difference value calculated through processing of the difference calculation step for each of the first electric capacitors other than the absolute difference value of each of the first electric capacitors.
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11. A program that causes a computer to perform processing including:
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a measurement step of measuring capacitance of each of a plurality of first electric capacitors having unknown capacitance; a determination step of determining whether a human body has contacted a contact section either directly or indirectly based on a result of comparison between the capacitance of the plurality of first electric capacitors measured by a measurement section and a threshold value for each of the plurality of first electric capacitors; a storage step of cumulatively storing a result of measurement for each of the plurality of first electric capacitors, the result of measurement being the result of measurement through processing of the measurement step; a reference capacitance calculation step of calculating reference capacitance for each of the plurality of first electric capacitors based on the result of measurement stored through processing of the storage step; a difference calculation step of calculating an absolute difference value between the reference capacitance for each of the plurality of first electric capacitors and the result of measurement measured through processing of the measurement step for each of the plurality of first electric capacitors; and an adjustment step of adjusting the threshold value for each of the plurality of first electric capacitors based on a sum of the absolute difference value calculated through processing of the difference calculation step for each of the first electric capacitors other than the absolute difference value of each of the first electric capacitors.
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Specification