TOUCH SENSOR, CONTROLLER, AND COMPUTER PROGRAM
To enable operations performed on an object to be accurately discriminated even under a noise environment.SOLUTION: A capacitance detection unit detects capacitance between an electrode and an object on a prescribed cycle as detected capacitance C. A control unit determines on the basis of a differe...
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Zusammenfassung: | To enable operations performed on an object to be accurately discriminated even under a noise environment.SOLUTION: A capacitance detection unit detects capacitance between an electrode and an object on a prescribed cycle as detected capacitance C. A control unit determines on the basis of a difference between the detected capacitance C and a reference capacitance Cr whether or not operation has been performed on the object. The control unit updates the reference capacitance Cr with the detected capacitance C. The control unit stops updating the reference capacitance Cr for only a first period T1 when the detected capacitance C is larger than the reference capacitance Cr and the difference is larger than a threshold Cth. The control unit determines whether or not the updating of the reference capacitance Cr in the first period T1 was stopped when the detected capacitance C is smaller than the reference capacitance Cr and the difference is larger than the threshold Cth. When it is determined that the updating was not stopped, the control unit stops updating the reference capacitance Cr for only a second period T2. When it is determined that the updating was stopped, the control unit stops updating the reference capacitance Cr for only a third period T3.SELECTED DRAWING: Figure 4
【課題】ノイズ環境下においても正確に対象物への操作を判別可能にする。【解決手段】静電容量検出部は、電極と対象物との間の静電容量を、所定の周期で検出静電容量Cとして検出する。制御部は、検出静電容量Cと基準静電容量Crの差分に基づいて、対象物に対する操作の有無の判断を行なう。制御部は、検出静電容量Cで基準静電容量Crを更新する。制御部は、検出静電容量Cが基準静電容量Crよりも大きくかつ前記差分が閾値Cthよりも大きい場合、第一期間T1だけ基準静電容量Crの更新を停止する。制御部は、検出静電容量Cが基準静電容量Crよりも小さくかつ前記差分が閾値Cthよりも大きい場合、第一期間T1の基準静電容量Crの更新停止がなされたかを判断する。当該更新停止がなされていないと判断された場合、制御部は、第二期間T2だけ基準静電容量Crの更新を停止する。当該更新停止がなされたと判断された場合、制御部は、第三期間T3だけ基準静電容量Crの更新を停止する。【選択図】図4 |
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