Touch sensor
AssigneeU-Shin Ltd.
InventorTetsuo TOKUDOME
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Abstract
It is provided a touch sensor stable against environmental variation comprising an oscillator 3 which outputs a periodical operation signal, an antenna electrode 2 which has a electrostatic capacitance straining the operation signal to form an output signal, a detection circuit 3,4,5 which generate a detection value corresponding to a difference between the output signal and a predetermined reference voltage, a determination means which determines whether a human body is proximate to the antenna electrode 2, based on the detection value, wherein a frequency of the operation signal is varied so that the detection value gets closer to a predetermined standard value.
Claims8
A touch sensor comprising
- an oscillator which outputs a periodical operation signal,
- an antenna electrode which has a electrostatic capacitance straining the operation signal to form an output signal,
- a detection circuit which generate a detection value corresponding to a difference between the output signal and a predetermined reference voltage,
- a determination means which determines whether a human body is proximate to the antenna electrode, based on the detection value,
- an adjustment means which changes a frequency of the operation signal so that the detection value gets closer to a predetermined standard value.
Dependencies are inferred from the claim text.