Electrostatic tablet writing stylus

Details Electrostatic tablet writing stylus Electrostatic tablet writing stylus

1978-06-26

1979-06-19

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

3401463SY, G08C 2100, H04N 100

Patent

active

041587472

ABSTRACT:
An improved device for capacitively detecting signals generated in a writing table by a grid of conductive wires that produce a varying electrostatic field near its surface to be picked up through a stack of paper with the table functioning as one plate of a capacitor, and a conductive stylus as the other plate. The improvement consists of grounding the stylus, which has an extended body portion surrounded by a tubular member, extending the tubular member to a point very near the stylus tip where it functions as the second plate of a capacitor, and connecting the tubular member to a preamplifier mounted in the device.

REFERENCES:
patent: 4034155 (1977-07-01), Muller et al.

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