Position detecting device and position pointing device therefor

Details Position detecting device and position pointing device therefor Position detecting device and position pointing device therefor

1995-02-13

1998-02-03

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345179, 178 19, G09G 500

Patent

active

057149844

ABSTRACT:
A position pointing pen to be used with a position detecting tablet having multiple sequentially activated coils includes a resonance circuit. In response to the resonance circuit receiving from the tablet a wave having greater than a predetermined amplitude, a sequence of twelve different time slots is established during which loading of the resonance circuit is controlled. During eight of the time slots, the resonance circuit is loaded with pen coordinate information obtained from the tablet coils. During a synchronizing time slot the resonance circuit is loaded by a fixed resistor. During the other three time slots the resonance circuit is loaded with other information, e.g. pen pressure, pen up/down, and color. When a coil of the tablet receives two substantially identical wave sequences from the pen the synchronizing containing slot is extracted and a CPU determines pen position and the other information.

REFERENCES:
patent: 5097415 (1992-03-01), Yoshimura et al.
patent: 5134388 (1992-07-01), Murakami et al.
patent: 5138118 (1992-08-01), Rusell
patent: 5308936 (1994-05-01), Biggs et al.
patent: 5349139 (1994-09-01), Verrier et al.
patent: 5373118 (1994-12-01), Watson

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