Simplified touch tablet data device
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United States of America Patent
Stats
-
Feb 11, 1986
Grant Date -
N/A
app pub date -
Mar 15, 1983
filing date -
Mar 15, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A touch tablet is provided containing two sheets of insulating material each of which contains a plurality of spaced apart conductive lines. A resistive strip on each sheet contacts and connects electrically one end of each of the plurality of conductive lines on that sheet. Each resistive strip functions as a potentiometer. Mounted between the two sheets and spaced apart therefrom is a conductive middle sheet. The first and second sheets are mounted such that the first and second sets of a plurality of conductive lines on these sheets are orthogonal to each other. A user presses on one of the two sheets to bring all three sheets into contact. The impedence of each potentiometer is a function of the contact point. The potentiometer is used as part of an RC circuit to provide a variable time constant representative of the coordinate of the contact point.
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