Patent ID: 7568610
Filing Date: 2009-08-04
Classification: H01L,H05K,Y02P

Abstract:
1. A method of soldering an electronic component to an electrode on a substrate, the method comprising the steps of: providing an electronic component which includes a solder bump and an oxide film provided on the solder bump; spreading flux containing metal powder into a membranous form on a stage having a transferring plane having an asperity, the metal powder containing a flaky form of metallic foil, the metal powder having a melting point higher than a melting point of the solder bump; pressing the solder bump against a portion of the transferring plane covered with the flux of the membranous form; said asperity having a geometry configured to embed the metal powder in a surface of the solder bump through the oxide film; disposing the solder bump embedded with the metal powder on the substrate with the bump in alignment to the electrode; and heating the substrate to melt the solder bump and leading the melted solder to the electrode on the substrate by flowing and spreading the melted solder along a surface of the metal powder.