Edge terminations for impedance planes
First Claim
1. In a polygonal impedance surface for converting physical position information on said impedance surface to electrical signals, improvement in edge terminations for said polygonal surface comprising;
- a plurality of parallel rows of conductive segments on each edge, respectively, of said polygonal impedance surface, with at least one outermost row conductor segment of adjacent edges being conductively connected together, and a connector terminal for connecting said at least one outermost row conductor of adjacent edges to an external electrical circuit.
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Abstract
Edge terminations for polygonal impedance or resistance surfaces provide linearization of current flow to and/or from the surface through electrical connections at the vertices of the polygon. The edge terminations are constituted by a series of parallel ranks or rows of connective segments overlaid, inlaid or printed at each edge of the polygonal surface with the innermost row or rank being short straight segments and the length of each segment of the next innermost row, respectively, being longer. The central segment in each row or rank is electrically interconnected with the central segments in the other rows. A guard plane of conductive metal insulated from the impedance or resistance surface is also provided.
172 Citations
9 Claims
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1. In a polygonal impedance surface for converting physical position information on said impedance surface to electrical signals, improvement in edge terminations for said polygonal surface comprising;
a plurality of parallel rows of conductive segments on each edge, respectively, of said polygonal impedance surface, with at least one outermost row conductor segment of adjacent edges being conductively connected together, and a connector terminal for connecting said at least one outermost row conductor of adjacent edges to an external electrical circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of modifying the resistance characteristics of the boundary sections of a thin layer of resistance material of a touch panel device having a polygonal geometrical perimetrical configuration, comprising applying a plurality of rows of straight conductor elements to the surface of each said boundary section, said rows of straight conductor elements being in a geometrical pattern such as to linearize current flow to and/or from said touch panel via said boundary sections to electrical terminals.
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9. In a touch panel system having an impedance layer forming a touchable surface, the improvement comprising a conductive layer forming a guard plane which has an area at least as great as the area of said impedance layer and being spaced therefrom by an insulating layer, and means for connecting said conductive layer to an electrical potential in said system.
Specification