G - Physics
06
K
354/60
G06K 9/62 (2006.01) G06F 3/033 (2006.01) G06K 9/24 (2006.01)
Patent
CA 1199117
ABSTRACT OF THE DISCLOSURE This invention is concerned with an x - y position measuring pad for use, for example, to recognize hand-writing, and comprises a writing pad having a pair of sheets one of which constitutes a high resistivity coating and the sheets being normally electrically insulated from one another by writing pressure by a writing implement upon the writing pad, an electrical switching circuit to cause current to flow through the pad along two alternate paths and a recognition circuit to recognize the position of the application of the writing implement on the pad by virtue of the electrical voltages generated in the alternate paths in which there is associated with the high resistivity layer part of the pad an integrated circuit and this integrated circuit includes a series of corrector circuits related to pre- determined positions on the high resistivity layer which corrector circuits are respectively rendered operative to provide a corrector signal when a part of the pad, to which that respective corrector circuit relates, is operative.
415639
Moore Business Forms Inc.
Smart & Biggar
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