Apparatus for scanning user input devices
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United States of America Patent
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-
Feb 17, 1998
Grant Date -
N/A
app pub date -
Jan 28, 1994
filing date -
Jan 28, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scanning apparatus for uniquely identifying an actuated key on a keyboard and an actuated location in a drawing tablet. The scanning apparatus includes independently actuatable switches associated with the keyboard. The scanning apparatus also includes vertical and horizontal conducting traces juxtaposed one to another and electrically connected to a horizontal and vertical resistive bar, respectively, associated with the drawing tablet. The switches and traces are energized under control of the apparatus such that portions of each can be actuated by a user resulting in the generation of unique analog signals indicative of the particular key and particular location upon the drawing tablet actuated by the user. These unique analog signals are converted to digital signals for further processing.
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