Electric heating – Metal heating – Wire – rod – or bar bonding
Patent
1982-10-08
1984-10-09
Shaw, C. C.
Electric heating
Metal heating
Wire, rod, or bar bonding
219 5621, 219 74, B23K 3100
Patent
active
044763654
ABSTRACT:
A method and apparatus is disclosed for forming a ball at the end of bonding wire or lead wire held in a capillary wire holding and bonding tool for ball bonding of the lead wire to an integrated circuit chip. The method of ball formation is of the type in which the end of the bonding wire is enclosed in a shroud or shield and the shield and the end of the bonding wire are flooded with an inert cover gas. Ball formation is accomplished by electrically discharging an arc between the bonding wire and the shroud for melting and forming the ball at the end of the wire. A passageway is provided for delivering and mixing hydrogen gas into the inert cover gas delivery line at a location upstream from the shroud sufficient for complete mixing. The rate of flow of hydrogen gas is metered and controlled for adjusting the percent by volume of hydrogen in the cover gas mixture to a desired range.
REFERENCES:
patent: 2497631 (1950-02-01), Rothschild
patent: 2522482 (1950-09-01), Olzak
patent: 2905805 (1959-09-01), McElrath et al.
patent: 4323759 (1982-04-01), Edson et al.
Cousens Donald E.
Kurtz John A.
Fairchild Camera & Instrument Corp.
Kane, Jr. Daniel H.
Olsen Kenneth
Shaw C. C.
Silverman Carl L.
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