Telegraphy – Systems – Position coordinate determination for writing
Patent
1989-09-28
1991-07-02
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
050287451
ABSTRACT:
The position of an implement is determined relative to a tablet including a tuned circuit with a resonant frequency including coils arranged in two coordinate directions. Coils of the tablet are sequentially excited with AC energy having approximately the same frequency as the resonant frequency. The tuned circuit interacts with the AC energy to change the AC current flowing in coils of the tablet as a function of the implement position so the greatest changes in the AC current are in coils of the tablet closest to the implement. Detected values of changes in current as a function of coil position are interpolated to indicate the implement position.
REFERENCES:
patent: 4711977 (1987-12-01), Miyamori et al.
patent: 4786765 (1988-11-01), Yamanami et al.
patent: 4848496 (1989-07-01), Murakami et al.
patent: 4878553 (1989-11-01), Yamanami et al.
patent: 4902858 (1990-02-01), Yamanami et al.
Funahashi Takahiko
Senda Toshiaki
Yamanami Tsuguya
Schreyer Stafford D.
Wacom Co. Ltd.
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