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Invention Application
WO2019069650A1 静電センサ及びドアハンドル 审中-公开

静電センサ及びドアハンドル
Abstract:
検出電極と、前記検出電極の周囲に設けられたシールド電極と、前記検出電極に接続されており、第１の電圧振幅の交流を発生させる第１の交流電源と、前記シールド電極に接続されており、第２の電圧振幅の交流を発生させる第２の交流電源と、前記第１の交流電源より前記検出電極に流れる電荷量を測定する電荷量測定部と、前記電荷量測定部に接続されている制御部と、を有し、前記第１の交流電源において発生させる交流と前記第２の交流電源において発生させる交流とは、同一周波数、かつ、同位相であり、前記第２の交流電源において発生させる交流電圧の第２の電圧振幅は、前記第１の交流電源において発生させる交流電圧の第１の電圧振幅よりも大きく、前記検出電極と被検出物との間の静電容量の変化に基づき検出面の側における前記被検出物を検出することを特徴とする静電センサ。
Abstract(English):

An electrostatic sensor characterized by comprising a detection electrode, a shield electrode that is provided around the detection electrode, a first alternating current power supply that is connected to the detection electrode and generates an alternating current that has a first voltage amplitude, a second alternating current power supply that is connected to the shield electrode and generates an alternating current that has a second voltage amplitude, a charge measurement unit that measures the charge flowing to the detection electrode from the first alternating current power supply, and a control unit that is connected to the charge measurement unit, wherein the frequencies and phases of the alternating current generated at the first alternating current power supply and the alternating current generated at the second alternating current power supply are the same, the second voltage amplitude of the alternating current generated at the second alternating current power supply is greater than the first voltage amplitude of the alternating current generated at the first alternating current power supply, and an object to be detected on the detection surface side is detected on the basis of changes in the electrostatic capacitance between the detection electrode and the object to be detected.

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