Patent ID: 8937008
Filing Date: 2015-01-20
Classification: B23K,H01L

Abstract:
1. A method, comprising: positioning a resist layer on a surface of a substrate having a plurality of contact pads thereon; defining a plurality of openings in the resist layer, each opening positioned over a respective one of the plurality of contact pads; depositing flux paste in each of the plurality of openings; positioning a solder ball in each of the plurality of openings in contact with the flux paste deposited in the respective opening by moving a ball feeder across the substrate, the ball feeder having a plurality of apertures spaced apart a distance that corresponds to a spacing, in one dimension, of the contact pads of the substrate, and dropping a single solder ball in each of the plurality of openings in the resist layer as the ball feeder moves across the respective openings; forming solder bumps on each of the plurality of contact pads by reflowing the plurality of solder balls in the respective openings; and removing the resist layer after reflowing the solder balls.