Abstract: A touch sensitive device includes an arrangement of conductors in combination with a pressure sensitive electrically conductive material. The conductors appear in a cross-wire matrix imprinted on the top and bottom surfaces of a rigid printed circuit board. The pressure sensitive electrically conductive material is positioned over the cross-wire matrix of spaced electrical conductors. The resulting arrangement defines a plurality of touch sensitive locations which may be used for uniquely entering information in a data entry system.

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.