Small shape recognizing capacitive sensor device
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United States of America Patent
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-
Apr 29, 2003
Grant Date -
Feb 14, 2002
app pub date -
Jun 8, 2001
filing date -
Jun 8, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A small shape recognizing capacitive sensor device includes detection elements, sensor circuits, and a correction circuit. The detection elements are arranged adjacent to each other. The sensor circuits are connected to the detection elements, respectively. The correction circuit corrects the output signal level of the sensor circuit. The output signal level correction circuit includes a calibration circuit, calibration reference signal generation circuit, and comparison circuit. The calibration circuit is connected to the output side of the sensor circuit. The calibration reference signal generation circuit generates a calibration reference signal. The comparison circuit compares the output from the sensor circuit with the calibration reference signal and supplies the difference output to the calibration circuit as a control signal. The calibration circuit corrects the level of the sensor circuit output on the basis of the control signal such that the difference between the output from the sensor circuit and the calibration reference signal becomes zero.
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