Cordless digitizer using electromagnetic locating signals

Telegraphy – Systems – Position coordinate determination for writing

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G08C 2100

Patent

active

053450442

ABSTRACT:
In order to determine without ambiguity the grid sections on which the pointer is located in a cordless electromagnetic digitizer having x and y locating grids, a third, "phase" grid has conductors that form elongated, narrow open loops, spaced so that each location on the work surface is enclosed by loops formed by a minority of the phase grid conductors. Any phase grid conductor with sufficient induced voltage can serve as a phase reference to determine the relative phases of the signals induced in all of the phase grid conductors. A phase grid conductor determined to have the relative phase of the minority can then serve as phase reference to identify the locating grid section unambiguously, and digitize the pointer location.

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patent: 5095180 (1992-03-01), Yamamoto

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