Apparatus for determining planar coordinates

Details Apparatus for determining planar coordinates Apparatus for determining planar coordinates

1980-03-07

1981-12-15

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

043061109

ABSTRACT:
A pair of overlapping, normally spaced conductive sheets (16,18) have sufficient flexibility between them to permit electrical contact when touched. One sheet has spaced, approximately parallel electrodes (20,21). The other sheet has spaced approximately parallel electrodes (22,23) transverse to the electrodes of the one sheet. A source of electrical power (10,12) is alternatively connected across the electrodes of one sheet to the exclusion of the other sheet. One electrode of each sheet is coupled to a signal processing circuit (32) having a high impedance differential input.

REFERENCES:
patent: 3005050 (1961-10-01), Koenig, Jr.
patent: 3632874 (1972-01-01), Malavard et al.
patent: 3662105 (1972-05-01), Hurst et al.
patent: 3875331 (1975-04-01), Hasenbalg
patent: 3885097 (1975-05-01), Pobgee
patent: 3959585 (1976-05-01), Mattes et al.
patent: 4079194 (1978-03-01), Kley
patent: 4125743 (1978-11-01), O'Boyle et al.

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