Printed conductive ink electrostatic shield for electromagnetic digitizers
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United States of America Patent
Stats
-
Dec 28, 1993
Grant Date -
N/A
app pub date -
Dec 26, 1991
filing date -
Dec 26, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electromagnetic digitizer tablet having a grid of receptor wire disposed below a working surface over which a cursor emanating a magnetic field detected by the receptor wires is moved, this invention is an improvement to reduce electrostatically-caused jitters in data from the receptor wires. A grounded electrically conductive shield disposed between the grid of receptor wires and the working surface. The grounded electrically conductive shield is of a material and thickness to pass the magnetic field without substantial attenuation while conducting any electrostatic energy forming thereon to ground. Both conductive ink and a very thin metal foil can be used for the shield. The digitizer tablet is also shown embodied in the input/display device of a pen-driven computing system.
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