Abstract: A composite top membrane designed for use with membrane-type switch arrays which is substantially smooth and ripple free. The composite membrane comprises:(1) a layer of plastic foam which is coated on each side with a pressure sensitive adhesive;(2) a decorative cover layer formed from plastic and having graphic indicia on one or both surfaces and which is adhesively affixed to one side of the aforementioned layer of plastic foam; and(3) a sheet of plastic having a significant memory property having its first surface adhesively affixed to the other side of the foam layer and a pattern of conductive metallization on its second surface.The layer of foam material provides a flat, resilient interface between the decorative cover layer and the relatively convoluted surface of the flexible printed circuit top membrane. As such, the decorative layer remains flat and free from optical irregularities which would detract from its aesthetic impression.

Abstract: A universal printed circuit pattern of conductors for use in connection with diaphragm-type push button electrical switch panels which allows the printed circuit board to be physically sheared along plural axes to accommodate switch panels of varying sizes without destroying electrical continuity of the ground or common conductor thereon.

Abstract: A connector for flexible printed circuitry including an elongated rectangular resilient receptacle having a plurality of rigid contact pins disclosed within the resilient block, and extending generally laterally outwardly thereof. The resilient block has an opening formed therein, with the opening extending across a pair of opposed spaced apart jaw members, with the opening including a diagonally extending throat zone which is in communication with a central cavity, the central cavity being disposed between the jaw members, and with the throat zone being disposed between inner and outer lip surfaces. The inner lip surface joins the central cavity along a generally convex surface, with the surface of each of said rigid pin members being substantially tangential through a convex surface, the arrangement being such that the rigid pin members maintain the convex juncture surface in flexed disposition away from said cavity to normally bias said convex surface against the surfaces of said rigid pin members.