Coordinate inputting apparatus with shared line combinations of

Details Coordinate inputting apparatus with shared line combinations of Coordinate inputting apparatus with shared line combinations of

1995-04-13

1998-04-07

Powell, Mark R.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Stylus

178 20, G06F 3033

Patent

active

057369801

ABSTRACT:
A coordinate inputting apparatus has a separating circuit, a cable and a position indicating pen. The separating circuit has a low pass filter for removing an alternating current component from a signal transmitted to a signal line and a band pass filter for passing only a position information signal in a predetermined frequency band with respect to the signal transmitted to the signal line. The cable is constructed by a signal line, a switching signal line and a ground line. The signal line is used to supply power to the position indicating pen and transmit a detecting signal from the position indicating pen to each of an X-coordinate detecting circuit and a Y-coordinate detecting circuit. The position indicating pen has a low pass filter for removing an alternating current component from a signal transmitted through the signal line and a band pass filter for passing only a position information signal in a predetermined frequency band. A signal transmitting system of this coordinate inputting apparatus and other coordinate inputting apparatuses are also shown.

REFERENCES:
patent: 4866602 (1989-09-01), Hall
patent: 4890096 (1989-12-01), Taguchi et al.
patent: 5247138 (1993-09-01), Landmeier
patent: 5298918 (1994-03-01), Yen-Chen et al.
patent: 5369228 (1994-11-01), Faust
patent: 5396443 (1995-03-01), Mese et al.
patent: 5528002 (1996-06-01), Katabami
patent: 5533141 (1996-07-01), Futatsugi et al.
patent: 5534892 (1996-07-01), Tagawa

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