Method and apparatus for forming a ball at a bonding wire end

Details Method and apparatus for forming a ball at a bonding wire end Method and apparatus for forming a ball at a bonding wire end

1992-05-22

1993-05-25

Shaw, Clifford C.

Electric heating

Metal heating

Wire, rod, or bar bonding

219 5621, 21913031, B23K 900

Patent

active

052142590

ABSTRACT:
In a method and apparatus for making uniform size balls at the end of bonding wires, a constant current circuit is installed between a high voltage power source and a discharge electrode so that a constant high voltage is applied between the bonding wire end and the discharge electrode and a discharge voltage is detected by a discharge voltage detecting circuit so that the thus detected discharge voltage is converted into a time so that a discharge time setting circuit which controls the constant current circuit regulates the discharge time period of the high voltage.

REFERENCES:
patent: 4687897 (1987-08-01), McKiel, Jr.

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