Pressure sensing apparatus for digitizer pen tip
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United States of America Patent
Stats
-
Oct 18, 1994
Grant Date -
N/A
app pub date -
Jan 28, 1993
filing date -
Jan 28, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a pen cursor for use in performing writing motions on the surface of a tablet, this is a sensor for mounting in a tip portion of the pen cursor to develop a signal output indicating longitudinal force on a writing tip of the pen cursor. A tip member extends from the tip portion of the pen cursor and is mounted for longitudinal movement. It has a plunger portion extending therefrom within the pen cursor. A resistive member and a conductive member are disposed within the pen cursor behind the plunger portion. The plunger portion forces the resistive member and the conductive member together in electrical contact over a contacting area which is directly proportional to the amount of longitudinal pressure on the plunger portion. A voltage is connected across the contacting area whereby resistance as a function of longitudinal pressure on the plunger portion can be measured.
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