Uses of uniaxially electrically conductive articles
AssigneeRaychem Corporation
InventorsNicholas J. G. Smith, Michael J. Ludden, Peter Nyholm, Paul J. Gibney
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Abstract
Polymer (preferably polyimide) sheets (10) with laser ablated through-holes plated with metal (20) are used for making electrical conections to specified microcircuits, especially unbumped microchips and Tape Automated Bonding (TAB) articles. Bonding with different melting point materials at opposite ends of the plated holes is disclosed. Preferred polyimides are those derived from polymerisation of 4,4'-biphenyldianhydride and (4,4'-diaminobiphenyl, or 4,4'-diaminobiphenylether, or phylenediamine, preferably p-phenylenediamine).
Claims27
An electrically conductive article comprising electrically insulating sheet material having first and second opposed main sheet surface regions with through-holes extending between the opposed main sheet surface regions and electrically conductive material providing electrically separate conductive paths close-fitting within the through-holes in the sheet material and extending substantially only between the opposed main surface regions thereof, wherein the conductive material adjacent to the first main sheet surface region projects beyond the first main sheet surface region and the projecting conductive material is overplated with metal such that the conductive material at one end of the said paths is bondable at a temperature lower than the minimum bonding temperature of the conductive material at the other end of the said paths.
Dependencies are inferred from the claim text.