G - Physics – 06 – F
Patent
G - Physics
06
F
350/6, 354/60, 3
G06F 3/02 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1103809
ABSTRACT OF THE DISCLOSURE A tablet input device includes a manipulation pad with a group of parallel drive lines and a group of sense lines which are interlaced in parallel with the drive lines. A drive circuit is provided which sequentially scans the drive lines with a variable drive current. When an input pen indicates a point on the face of the manipulation pad and when one of the drive lines adjacent to this point is excited, a voltage is in- duced across one or more sense lines adjacent the excited drive line. A sense circuit is provided which detects the magnitude or the polarity of the induced voltage, thereby detecting the address of the point indicated by the input pen.
304432
Gowling Lafleur Henderson Llp
Nippon Telegraph And Telephone Public Corporation
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