Method of forming an electrical contact bump
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United States of America Patent
Stats
-
Feb 25, 1992
Issued Date -
N/A
app pub date -
Oct 30, 1990
filing date -
Dec 8, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A substrate provided with conductive terminals and another substrate provided with electrode pads and two-stepped electrical contact bumps formed respectively on the electrode pads and each consisting of a first raised portion and a second raised portion formed on the first raised portion, are joined securely by bonding the second raised portions coated respectively with droplets of conductive adhesive and the corresponding conductive terminals by the droplets of the conducting adhesive. The ratio of the area of a section of the first raised portion in a plane parallel to the surface of the electrode pad is greater than the area of a section of the second raised portion parallel to the section of the first raised portion at a predetermined ratio. In an exemplary method of forming the electrical contact bump, the second raised portion is formed by bending a conductive wire in a loop by a ball bonding apparatus.
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