McDermott Will & Emery LLP
Electrostatic capacity type touch sensor
This invention offers an electrostatic capacity type touch sensor that can be calibrated in a short period of time at a moment when a finger of operator or the like does not touch a touch pad. An absolute value of a difference (AD0−AD2) between a first output voltage AD0 and a third output voltage AD2 is compared with a first threshold value Vtr1 in step S10. When the difference (AD0−AD2) between the output voltages is smaller than the first threshold value Vtr1, it is judged that the finger of operator or the like does not touch the touch pad, and it is judged which of an offset in a second output voltage AD1 and an offset in the third output voltage AD2 is smaller than the other. When the offset in the second output voltage AD1 is smaller than the offset in the third output voltage AD2, the modification to the second calibration data X1 is permitted.
On Semiconductor Trading, Ltd.
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inventional inventional inventional
Atsuhiro Kazuhiro Hiroya Takayasu
Ichikawa Hasegawa Ito Otagaki