Electric heating – Metal heating – Wire – rod – or bar bonding
Patent
1983-07-25
1986-06-10
Shaw, Clifford C.
Electric heating
Metal heating
Wire, rod, or bar bonding
219 5621, 219 74, B23K 3100
Patent
active
045944938
ABSTRACT:
The present invention relates to a method and apparatus for forming a ball bond between a fine wire such as aluminum wire and a surface with the ball bond being approximately radially symmetric about a principal axis of a portion of the wire. The apparatus may include a plurality of electrodes radially spaced about the wire to define gaps between each electrode and the tip of the wire and a plurality of resistance elements. A voltage source may be connected to form a circuit consisting of plural electrically parallel legs, each of which includes the series combination of a resistance element, an electrode and an arc path between the electrode and the tip of the wire. A molten ball is formed at the end of the wire when arcs are essentially simultaneously produced between the electrodes and the tip of the wire. In a preferred embodiment, the resistances of the resistance elements are approximately equal. In addition, the plurality of electrodes are preferably symmetrically spaced about the wire to define gaps of nearly equal length between each electrode and the tip of the wire.
REFERENCES:
patent: 652607 (1900-06-01), Hanks
patent: 4323759 (1982-04-01), Edson et al.
patent: 4476365 (1984-10-01), Kurtz et al.
Harrah Shane
Phy William
Fairchild Camera & Instrument Corp.
Shaw Clifford C.
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