Patent ID: 6025258
Filing Date: 2000-02-15
Classification: B23K,H01L,H05K

Abstract:
A method for fabricating solder bumps, said method comprising the steps of:preparing a solder ball forming member having a flat surface and a plurality of cavities arranged on said flat surface in a pattern;filling said cavities with a solder paste including solder powder and a flux;heating said solder ball forming member to cause the solder powder contained in the solder paste in each of said cavities to melt and to form solder balls due to surface tension;moving a first member onto which solder bumps are to be formed toward the solder ball forming member to transfer the heated solder balls from the solder ball forming member to the first member; andcooling the solder ball forming member after the solder balls have formed and before the solder balls have been transferred to the first member.