Patent ID: 8899993

Claim:
An interposer assembly for forming electrical connections between contacts on opposed substrates, the interposer assembly comprising, a flat plate formed of thermoplastic resin, the plate having opposed flat and parallel top and bottom surfaces and a uniform thickness, a central plane located equidistant between the top and bottom surfaces, and a plurality of contact apertures extending through the thickness of the plate, said apertures arranged on the plate in intersecting rows and columns, each aperture having opposed aperture walls and an elastically depressed recess in an aperture wall; and a plurality of contact members, each contact member having a substantially flat central portion in a contact aperture, an upper contact portion extending upwardly from the central portion toward the plate top surface and a lower contact portion extending downwardly from the central portion toward the plate bottom surface, the central portion having opposed side edges engaging the aperture walls and one or more rounded contact protrusions on a first side edge, each protrusion extending a distance into an aperture wall and elastically stressing resin in the aperture wall to form the recess in the aperture wall and exert a stress force on the plate; the total of the stress forces exerted on the plate by the contact protrusions being essentially zero at the central plane so that the plate is substantially flat.