Electrostatic pen apparatus and method having an electrically co

Details Electrostatic pen apparatus and method having an electrically co Electrostatic pen apparatus and method having an electrically co

1997-04-11

1999-03-02

Loomis, Paul

Telegraphy

Systems

Position coordinate determination for writing

178 1901, 345179, G08C 2100

Patent

active

058774599

ABSTRACT:
An electrostatic pen is disclosed wherein the pen's tablet engaging tip is both electrically conductive and flexible, thus providing an increasing tip contact area to a digitizing tablet as the tip of the manually held pen is pressed downward onto the tablet's top insulating layer. A signal source and signal detector are connected in series between the pen tip and the tablet's lower conductive layer. The increased contact area of the tip increases the capacitance between the tip and the tablet's lower conductive layer, thus improving the signal to noise ratio of the detected signal.

REFERENCES:
patent: 5138118 (1992-08-01), Russell
patent: 5357062 (1994-10-01), Rockwell et al.
patent: 5440080 (1995-08-01), Nagaoka et al.
patent: 5488204 (1996-01-01), Mead et al.

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