Electrical sensing writing pen

Details Electrical sensing writing pen Electrical sensing writing pen

1976-04-19

1977-07-05

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

3401463SY, 346139C, G08C 2100, H04N 100

Patent

active

040341550

ABSTRACT:
A writing pen capacitively detects and amplifies signals generated by a writing table that produces a varying electrostatic field near its writing surface. The pen cartridge, which senses the signal, is capacitively coupled to a concentric electrode, from which the signal which has been detected may be obtained for amplification.

REFERENCES:
patent: 3444465 (1969-05-01), Teixeira
patent: 3886311 (1975-05-01), Rodgers et al.

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