Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Patent
1991-10-15
1993-06-29
Thomas, Alexander S.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
428209, 428220, 206330, 29827, 257666, B32B 310
Patent
active
052233219
ABSTRACT:
A tape for use in tape-automated-bonding of integrated circuits is disclosed. A series of interconnection arrays ("frames") are arranged along the tape, each array being formed by a number of interconnection beams 3. A terminal ("bump") 6 is located on each beam 3 for bonding to a respective interconnection pad 7 of an integrated circuit 8. Conventional bumps are made of gold-plated copper and have uneven and unyielding bonding surfaces which can fail to provide consistent bonds. The bumps 6 of the tape disclosed comprise a conductive material having a Vickers hardness number of 55 or less, and thus have a compliance which facilitates more even bonding. A method of producing the tape is also disclosed.
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Blain Alexander A.
Cooper Kenneth
Sinnadurai F. Nihal
Small David J.
British Telecommunications PLC
Thomas Alexander S.
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