Uses of uniaxially electrically conductive articles
AssigneeRaychem Corporation
InventorsNicholas J. G. Smith, Michael Joseph Ludden, Peter Nyholm, Paul James Gibney
Life of this patent
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Abstract
Polymer (preferably polyimide) sheets with laser ablated through-holes plated with metal are used for making electrical connections 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 phenylenediamine, preferably p-phenylenediamine).
Claims31
A method of making electrical connections between an array of connection sites on an integrated circuit microelectronics device and electrical conductors carried on a tape support material with an array of unsupported end portions of the conductors projecting beyond an edge of the support material, wherein:
- (a) said end portions of the conductors are respectively aligned with said connection sites to which connections are to be made,
- (b) an anisotropically electrically conductive article comprising electrically insulating sheet material with through-holes containing electrically conductive material which provides an electrically conductive path from one of the main surface regions of the sheet material to the other is positioned with the respective ends of at least one such path aligned between each connection site and the conductor end portion aligned therewith, and
- (c) the ends of the path(s) so aligned are bonded respectively to the connection sites and to the conductor end portions.
Dependencies are inferred from the claim text.