Patent ID: 6319810
Filing Date: 2001-11-20
Classification: B23K,H01L,H05K

Abstract:
A method for forming solder bumps, comprising the steps of:filling holes of a flat plate with a solder paste by squeezing;heating the flat plate to a temperature higher than the melting point of the solder to form solder balls from the solder paste in the holes of the flat plate;removing an oxidation layer on electrode pads of an electric component arranged at positions corresponding to those of the holes of the flat plate;after said removing step, overlapping the flat plate with the electric component one above another while the solder balls are positioned relative to the electrode pads; andafter said overlapping step, heating the flat plate and the electric component overlapped with each other to a temperature higher than the melting point of the solder to transfer the solder balls from the flat plate to the electric component.