Charge transfer capacitive position sensor
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United States of America Patent
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Dec 12, 2006
Issued Date -
N/A
app pub date -
Oct 30, 2003
filing date -
Oct 31, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
The position of an object, which may be a user's finger, along a body is sensed capacitively. A measurement circuit meters the simultaneous injection of electrical charge into the two ends of the body, which may be shaped as a straight line or as a curve. A computing device computes the ratio of the relative changes in the amount of charge injected into each end of the element. The result of this computation is a one dimensional coordinate number plus a detection state indication, both of which can be fed to another functional element, such as an appliance controller, which interprets the coordinate and detection state as a command or measurement.
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