Telegraphy – Systems – Position coordinate determination for writing
Patent
1985-07-19
1987-04-21
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
338 99, 340706, G08C 2100
Patent
active
046598731
ABSTRACT:
A fabric touch sensor for providing positional information related to a touched region/points. The improved electrographic touch sensor (10) is fabricated using at least one resistive fabric layer (12) in the form of conducting threads. This fabric is constructed using either unidirectional threads (16) or crossed threads (16, 18) formed by overlaying one set with another or weaving the two sets together. The fabric (12) is separated from a second resistive layer (14) to prevent unintentional contact, with separators (24) in the form of non-conducting threads (42), insulator dots (24), or with an air gap. In a preferred embodiment, both resistive layers are fabrics (12, 14) formed from conductive threads. Prevention of Moire-type visual patterns is achieved by orienting the threads in one fabric layer at an oblique angle to those of the second fabric layer. This sensor results in ease of fabrication, reduction of cost, reduction of parallax and eliminates substrate problems associated with those sensors employing the same. No preforming is required to adapt this sensor to a contoured object (36) when both resistive layers are fabric.
REFERENCES:
patent: 4455450 (1984-06-01), Margolin
patent: 4493104 (1985-01-01), Lukis et al.
Gibson William A.
Talmage, Jr. John E.
Elographics, Inc.
Schreyer Stafford D.
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