Printed conductive ink electrostatic shield for electromagnetic

Details Printed conductive ink electrostatic shield for electromagnetic Printed conductive ink electrostatic shield for electromagnetic

1991-12-26

1993-12-28

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 1300

Patent

active

052741982

ABSTRACT:
In an electromagnetic digitizer tablet having a grid of receptor wire disposed below a working surface over which a cursor emanating a magnetic field detected by the receptor wires is moved, this invention is an improvement to reduce electrostatically-caused jitters in data from the receptor wires. A grounded electrically conductive shield disposed between the grid of receptor wires and the working surface. The grounded electrically conductive shield is of a material and thickness to pass the magnetic field without substantial attenuation while conducting any electrostatic energy forming thereon to ground. Both conductive ink and a very thin metal foil can be used for the shield. The digitizer tablet is also shown embodied in the input/display device of a pen-driven computing system.

REFERENCES:
patent: 4587378 (1986-05-01), Moore
patent: 4988837 (1991-01-01), Murakami et al.
patent: 5124509 (1992-06-01), Hoendervoogt et al.

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