Method and apparatus for adjusting the threshold for determining the thickness of or the number of sheets in a sheet material
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United States of America Patent
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Dec 1, 1992
Grant Date -
N/A
app pub date -
Oct 15, 1990
filing date -
Oct 15, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Two capacitive sensors are positioned on opposite sides of the sheet material, having their outputs connected additively. The output of the capacitive sensors is then supplied to a comparator to which a known reference voltage is also supplied. An adaptive circuit adaptively changes the reference voltage.
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