Patent ID: 6062462
Filing Date: 2000-05-16
Classification: B23K,H01L

Abstract:
A method for making a free air ball on a fine wire in a bonding tool of a fine wire bonder, comprising the steps of:a. selecting a predetermined air ball size for entry in the automatic wire bonder,b. selecting the wire diameter size of the fine wire used in the wire bonder,c. selecting a desired electronic flame off (EFO) current I.sub.c to be used to melt the fine wire and make said air ball,d. automatically calculating a time duration T.sub.i for application of said selected EFO current,e. positioning a free end of a fine wire tail juxtaposed an EFO electrode at a known gap, andf. applying said EFO current between said EFO electrode and said fine wire tail for the calculated time T.sub.i,g. whereby a predetermined volume of said wire tail is melted and forms a spherical ball having the predetermined selected air ball size.