Telegraphy – Systems – Position coordinate determination for writing
Patent
1991-04-29
1994-09-06
Chin, Stephen
Telegraphy
Systems
Position coordinate determination for writing
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.
REFERENCES:
patent: 3689885 (1972-09-01), Kaplan et al.
patent: 4023167 (1977-05-01), Wahlstrom
patent: 4054746 (1977-10-01), Kamm
patent: 4423286 (1983-12-01), Bergeron
patent: 4672154 (1987-06-01), Rodgers et al.
patent: 4704501 (1987-11-01), Taguchi et al.
patent: 4734546 (1988-03-01), Landmeier
patent: 4786765 (1988-11-01), Yamanami et al.
patent: 4795858 (1989-01-01), Yamazaki
patent: 4878553 (1989-11-01), Yamanami et al.
patent: 5095180 (1992-03-01), Yamamoto
CalComp Inc.
Chin Stephen
Loomis Paul
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