Membrane-type touch panel employing insulating grid anti-short means
First Claim
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1. A transparent switch matrix to be carried on the face of a rigid insulator substrate, having a predetermined radius of curvature, and comprising:
- a. a plurality of spaced apart conductive first strips firmly adhering to the face of the substrate;
b. a transparent resilient insulating membrane having an undistorted contour substantially alike the predetermined contour, and attached about its periphery to the face of the substrate in a position matching the membrane contour to the substrate contour and spaced apart from the first strips thereon in a predetermined area of the membrane;
c. a plurality of transparent, flexible, spaced apart conductive second strips firmly adhering to the resilient membrane surface facing the substrate, each of said second strips located in the area spaced apart from the first strips and thinner than the spacing therefrom, and each of said second strips crossing at least two first strips; and
d. a thin insulating grip interposed between the first and second strips having within each crossover area between the first and second strips, a plurality of gaps permitting electrical contact between the first and second strips responsive to manual pressure at each crossover area.
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Abstract
A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger pressure can cause electrical contact between any one of the first set of strips and any one of the second set of strips. The substrate may be either flat or curved, with the membrane conforming to its contour.
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Citations
8 Claims
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1. A transparent switch matrix to be carried on the face of a rigid insulator substrate, having a predetermined radius of curvature, and comprising:
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a. a plurality of spaced apart conductive first strips firmly adhering to the face of the substrate; b. a transparent resilient insulating membrane having an undistorted contour substantially alike the predetermined contour, and attached about its periphery to the face of the substrate in a position matching the membrane contour to the substrate contour and spaced apart from the first strips thereon in a predetermined area of the membrane; c. a plurality of transparent, flexible, spaced apart conductive second strips firmly adhering to the resilient membrane surface facing the substrate, each of said second strips located in the area spaced apart from the first strips and thinner than the spacing therefrom, and each of said second strips crossing at least two first strips; and d. a thin insulating grip interposed between the first and second strips having within each crossover area between the first and second strips, a plurality of gaps permitting electrical contact between the first and second strips responsive to manual pressure at each crossover area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification