Telegraphy – Systems – Position coordinate determination for writing
Patent
1978-12-04
1980-09-02
Robinson, Thomas A.
Telegraphy
Systems
Position coordinate determination for writing
H04N 100, G09B 700, G08B 536
Patent
active
042208157
ABSTRACT:
An electrographic sensor for the generation of coordinate signals corresponding to contacted positions on the sensor is described. This sensor is of particular value for placing in intimate contact with the nonplanar face of a cathode ray tube or the like. The sensor has a rigid, optically transparent substrate with a nonplanar configuration matching the nonplanar face of the CRT to reduce parallax. This normally involves a radius of curvature, in one or more directions, in a range of 15-50 inches (38-127 cm). The surface of the substrate which will not contact the CRT is coated to provide a very uniform, substantially transparent, electrically resistive layer, and electrodes are connected to the resistive layer whereby orthogonal electrical potentials may be applied to the layer. Overlying and spaced from the resistive layer is a semirigid transparent cover sheet, the face toward the resistive layer being appreciably conducting. Dispersed small areas of insulation, of minimum height, prevent contact of the resistive layer and the conducting face unless the cover sheet is depressed by an object such as a finger or stylus.
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Gibson William A.
Talmage, Jr. John E.
Elographics, Inc.
Robinson Thomas A.
Skinner Martin J.
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