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Operation switch using electrostatic capacitance sensor

  • US 10,353,522 B2
  • Filed: 02/23/2017
  • Issued: 07/16/2019
  • Est. Priority Date: 03/25/2016
  • Status: Expired due to Fees
First Claim
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1. An operation switch comprising:

  • an electrostatic capacitance sensor that generates a sensing signal in response to approach or contact of an object; and

    a controller thatcalculates, when the sensing signal exceeds a first threshold at a first time point, a rate of change in a magnitude of the sensing signal in a first period including the first time point,determines, when the rate of change is not larger than a first rate, the object is a human body,determines, when the rate of change is larger than the first rate and further when the sensing signal falls below a second threshold in a second period subsequent to the first period, the object is a human body, anddetermines, when the rate of change is larger than the first rate and further when the sensing signal does not fall below the second threshold in the second period, the object is not a human body.

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