Position detector and position indicator therefor

Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel

Reexamination Certificate

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C178S019040, C345S179000

Reexamination Certificate

active

06930674

ABSTRACT:
A position indicator contains a resonant circuit. A first resistor having a minimum resistance, a second resistor having a maximum resistance, and a variable resistor whose resistance varies within the range of minimum to maximum resistances are connected to the resonant circuit at first, second, and third specific times based on predetermined timing information supplied from a tablet. Signal levels detected by the tablet at the first and second specific times are used as a lower limit and an upper limit of an operation quantity. Within this range, a signal level detected at the third specific time is converted into an operation quantity. Thus, the continuous quantity can be detected at a fast sampling rate without being influenced by the height and tilt of the position indicator.

REFERENCES:
patent: 5699084 (1997-12-01), Fukuzaki
patent: 5854881 (1998-12-01), Yoshida et al.
patent: 6020849 (2000-02-01), Fukuzaki
patent: 6667740 (2003-12-01), Ely et al.

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