Electric heating – Metal heating – Wire – rod – or bar bonding
Patent
1985-04-24
1986-03-11
Shaw, Clifford C.
Electric heating
Metal heating
Wire, rod, or bar bonding
228 45, B23K 3100
Patent
active
045756023
ABSTRACT:
There is disclosed an improved apparatus for forming a bonding ball on a tip end of the bonding wire. There are provided a capillary member having a through-hole for holding and guiding the bonding wire, and a cylindrical member having an inner diameter larger than the outer diameter of said capillary member and located in a substantially coaxial relation to the capillary member. The cylindrical member is adapted to be reciprocated in the same direction as that of movement of the capillary member but at a velocity slower than the moving velocity of said capillary member. Further, the cylindrical member is ceaselessly supplied with an inert gas. When the tip end of the bonding wire held by the capillary member is moved into the inside space of the cylindrical member because of the moving velocity difference between the capillary member and the cylindrical member in the upward stroke of the reciprocation of the two members, the tip end of the bonding wire is molten so as to form a bonding ball in the inert gas formed within the cylindrical member.
REFERENCES:
patent: 4323759 (1982-04-01), Edson et al.
patent: 4387283 (1983-06-01), Peterson et al.
patent: 4390771 (1983-06-01), Kurtz et al.
NEC Corporation
Shaw Clifford C.
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