Capacitance touch slider
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United States of America Patent
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Oct 12, 2010
Issued Date -
N/A
app pub date -
Nov 3, 2006
filing date -
Mar 30, 2001
priority date (Note) -
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Abstract
A device for detecting the position of a human finger or other object on a touch-sensitive scrolling pad. Dual independent oscillators may be used to generate two pulse trains at frequencies dependent upon the capacitance of two conductors resulting from the position of the finger on the conductors. The pulses from each oscillator may be counted over a time interval. A ratio-metric measurement may be taken by calculating the ratio of the two counts, and a sum may also be calculated. The ratio of the two counts relates to finger position on the device, and their sum relates to finger pressure upon the device.
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