Summagraphics Corporation

Stephen L Domyan

Edward J Snyder

Robert L Davis

A position coordinate determination device wherein data generation lines are displaced from the edges of a data surface, and a sensing device is movably located on the surface. Erroneous detection of data resulting from reflection of signals at the edge of the sheet is inhibited by summing the times required for waves to pass between the sensor and both data generation lines. When this sum exceeds a predetermined level, an erroneous detection is indicated and the processing of the data may be inhibited.

Position coordinate determination device

A position coordinate determination device employing duodatum digitizations for each coordinate of a pair of respective coordinates and a ratiometric proportionality calculation for calculating a corrected coordinate digitization value in each measured coordinate.

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Norwalk, CT, United States of America

Stephen L Domyan