System for producing electric field with predetermined characteristics and edge terminations for resistance planes therefor
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United States of America Patent
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-
Apr 15, 1980
Issued Date -
N/A
app pub date -
Jan 5, 1978
filing date -
Jan 19, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system is described for coupling two voltage sources to a resistive plane, surface or layer so as to produce a uniform electric field in said plane with orthogonal components along the two axes of the plane generated by the two voltage sources so that coordinates of position of a digit or finger in the field may be determined. Techniques are described for fabricating both the plane and the coupling elements from the same resistive material. It is also shown how nonlinear electric fields can be created while preserving orthogonality. Three-dimensional fields of predetermined characteristics can be created by extending the techniques to curved surfaces and by using multiple surfaces.
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