Membrane-type touch panel employing a photo-resist insulating grid anti-short means

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 transparent conductive first strips firmly adhering to the face of the substrate;
• b. a transparent resilient membrane having an undistorted contour substantially alike the pre-determined 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 grid interposed between the first and second strips and absent external force separating the first strips from the second strips, and having within each crossover area between the first and second strips, a plurality of gaps permitting electrical contact between first and second strips responsive to manual pressure at each crossover area, said grid formed by insulating photo-resist material adherent to one of the two sets of strips.