Electrical resistors – Mechanically variable – Deformable
Patent
1983-03-15
1986-02-11
Leung, Philip W.
Electrical resistors
Mechanically variable
Deformable
338 99, 178 18, 178 20, G08C 2100
Patent
active
045701490
ABSTRACT:
A touch tablet is provided containing two sheets of insulating material each of which contains a plurality of spaced apart conductive lines. A resistive strip on each sheet contacts and connects electrically one end of each of the plurality of conductive lines on that sheet. Each resistive strip functions as a potentiometer. Mounted between the two sheets and spaced apart therefrom is a conductive middle sheet. The first and second sheets are mounted such that the first and second sets of a plurality of conductive lines on these sheets are orthogonal to each other. A user presses on one of the two sheets to bring all three sheets into contact. The impedence of each potentiometer is a function of the contact point. The potentiometer is used as part of an RC circuit to provide a variable time constant representative of the coordinate of the contact point.
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Hevesi, "Analog Data Tablet", IBM Technical Disclosure vol. 23, No. 2, Jul. 1980 pp. 666-667.
Thornburg David D.
White, III George M.
Caserza Steven F.
Franklin Richard
Koala Technologies Corporation
Leung Philip W.
MacPherson Alan H.
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