Telegraphy – Systems – Position coordinate determination for writing
Patent
1975-10-23
1977-03-22
Robinson, Thomas A.
Telegraphy
Systems
Position coordinate determination for writing
340365A, G08C 2100
Patent
active
040138356
ABSTRACT:
A novel data entry system is disclosed which comprises both a touch sensitive device and a location identification device. The touch sensitive device includes a printed circuit board arrangement of conductors which define data input locations that are touch sensitive. The locations are touch sensitive by virtue of a layer of variable resistance material disposed over the printed circuit board which is highly conductive when subjected to touch pressure. The electrical conductivity of a touched location is sensed by the location identification device which thereafter provides a digital coding of the location and maintains the same until the touch pressure has been removed. The location identification device moreover prevents the double entry of data due to any variation in the touch pressure.
REFERENCES:
patent: 3503031 (1970-03-01), Nyhus et al.
patent: 3539995 (1970-11-01), Brandt
patent: 3757322 (1973-09-01), Barkan et al.
patent: 3758718 (1973-09-01), Fletcher et al.
patent: 3860754 (1975-01-01), Johnson et al.
patent: 3944740 (1976-03-01), Murase et al.
Eachus Joseph J.
Graff Theodore S.
Seggelin Douglas H.
Honeywell Information Systems Inc.
Reiling Ronald T.
Robinson Thomas A.
White William F.
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