Position pointing device having resonant circuit with sequential

Details Position pointing device having resonant circuit with sequential Position pointing device having resonant circuit with sequential

1995-03-17

1997-08-26

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

198 19, 345156, 345179, 345176, G08C 2100, G09G 302

Patent

active

056612699

ABSTRACT:
A position pointing device for use with a digitizing tablet sequentially transmits plural different kinds of non-positional information to the tablet. The position pointing device varies a resonance characteristic of a resonance circuit in accordance with plural kinds of amount information, during each of plural sequential time slots. A tablet detects a resonance characteristic of the resonance circuit. The frequency and/or amplitude of the AC field coupled from the resonance circuit to the tablet are varied. The frequency variation is sufficiently small that it can be detected with a synchronous detector driven by a single frequency.

REFERENCES:
patent: 4616106 (1986-10-01), Fowler
patent: 4617515 (1986-10-01), Taguchi
patent: 4697050 (1987-09-01), Farel
patent: 4786764 (1988-11-01), Padula
patent: 4786765 (1988-11-01), Yamanami
patent: 4992630 (1991-02-01), Mietzko
patent: 5349139 (1994-09-01), Verrier et al.

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