Coordinate input device used for inputting characters and drawin

Details Coordinate input device used for inputting characters and drawin Coordinate input device used for inputting characters and drawin

1996-04-08

1998-12-29

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1802, 178 1805, 345173, 345174, 345179, G08C 2100, G09G 500

Patent

active

058544488

ABSTRACT:
A coordinate input device includes (1) a pen switch sensing circuit for providing a power supply to a pen switch in a position sensing pen, and for sensing that the pen switch is turned on and off and (2) a pen switch control circuit for controlling a timing of the power supply. The power supply is provided to the pen switch only when coordinate sensing operations are not affected. The power supply is stopped in order to avoid a voltage change happening to the pen switch when the coordinate sensing operation is affected. Therefore, the pen switch is neither turned on nor turned off during a coordinate sensing period. Consequently, it is possible to avoid a wrong sensing of a coordinate indicated with the position sensing pen.

REFERENCES:
patent: 4492818 (1985-01-01), Abe
patent: 5194852 (1993-03-01), More et al.
patent: 5451724 (1995-09-01), Nakazawa et al.
patent: 5589857 (1996-12-01), Tanahashi et al.

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