Graphics input tablet with three-dimensional data
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United States of America Patent
Stats
-
Jan 17, 1989
Grant Date -
N/A
app pub date -
Mar 11, 1988
filing date -
Apr 28, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A graphics input tablet has a conductive layer and a resistive layer with contacts (16,17,23,24) arranged one along each edge of the resistive layer. The conductive layer is held at a negative potential relative to the resistive layer so current flows in each contact when localized pressure is applied to a region of the tablet (20) to bring the layers into electrical contact. The currents vary with both position and magnitude of the localized pressure. The position of the pressure is detected from the relative currents in opposed contacts and the magnitude of the pressure is detected from the total current in the contacts. The currents are measured by current sense amplifiers and processed in a computer. Analogue front-end processing of the currents is also possible.
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