A complex of contact sheets for providing an electrical connection between two or more electronic devices each having spherical or planar terminals, said complex comprising:
- at least a first and a second contact sheet, each of said first and said second contact sheets comprising
- a plurality of insulative elastic substrate sheets disposed to form a layered structure having a plurality of through holes formed therethrough in a predetermined pattern, and
- a plurality of conductive elastic contacts each extending from a first end thereof to an opposed second end thereof to define a longitudinal length dimension therebetween and having a width dimension measured perpendicular to said length,
- wherein said first end of each said contact is fixed to at least one of said insulative elastic substrate sheets at a fixed point proximate one edge of a respective through hole, and said second end is arranged to bend as a cantilever extended from said fixed point such that said second end departs a predetermined distance from a first surface of said contact sheet with respect to said fixed point when a load is applied to said second end,
- each said contact further comprising a bending portion located proximate a midpoint of said length of said contact where said contact is bent to extend in an angular direction such that said second end of said contact is positioned at said distance from said first surface of said contact sheet,
- wherein said width of said contact continuously varies to be greater at portions of said contact which are subjected to larger stresses and less at positions of said contact which are subjected to smaller stresses when a load is applied to said second end of said contact;
- and
- an adhesive sheet having a plurality of through holes formed therethrough in the same pattern as said predetermined pattern of each of said first and said second contact sheets, said adhesive sheet being interposed between a second surface of said first contact sheet and a second surface of said second contact sheet to bond said first and said contact sheets to one another, and said first and said second contact sheets are disposed as a layered structure such that said patterns of said through holes of each of said first and said second contact sheets substantially align and said contacts of said first contact sheet substantially face said contacts of said second contact sheet;
- wherein when a first electronic device is mounted on a first side of said first contact sheet, a spherical terminal or a planar terminal of the first electronic device applies a load to said second end of said contact of said first contact sheet, and said second end of said contact of said first contact sheet presses against and wipes a surface of the spherical terminal or the planar terminal to secure an electrical connection between said contact of said first contact sheet and the first electronic device, while said bending portion of said contact of said first contact sheet is warped by the stress applied thereto and is pressed against a bending portion of a contact of said second contact sheet facing said contact of said first contact sheet to provide an electrical connection between said contact of said first contact sheet and said contact of said second contact sheet, and when a second electronic device is mounted on a first side of said second contact sheet, a spherical terminal or a planar terminal of the second electronic device applies a load to said second end of said contact of said second contact sheet, and said second end of said contact of said second contact sheet presses against and wipes a surface of the spherical terminal or the planar terminal to secure an electrical connection between said contact of said second contact sheet and the second electronic device;
- whereby the first and the second electronic devices are securely electrically connected to each other via said contacts of said first and said second contact sheets of said complex.