Pen input device
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United States of America Patent
Stats
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Aug 22, 1995
Grant Date -
N/A
app pub date -
Sep 20, 1993
filing date -
Sep 21, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pen input device is provided with a tablet having a top surface and a plurality of reference lines provided at a constant pitch on the top surface in mutually perpendicular directions, and a pointing device having a tip end, a first device for irradiating light on the tablet via the tip end, and a second device for detecting a moving direction and a moving quantity of the tip end of the pointing device on the tablet and a distance between the tip end of the pointing device and the top surface of the tablet based on scattered light received from the tablet.
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