Patent ID: 6595408
Filing Date: 2003-07-22
Classification: B23K,H01L,H05K,Y10T

Abstract:
A method for forming a ball-grid-array comprising the steps of:providing a ball pickup tool having at least one orifice for picking up a preformed solder ball, each of said at least one orifice in said ball pickup tool includes a ball seat controllably connected to a vacuum source and a pressure source; providing a solder ball reservoir containing a plurality of preformed miniature solder balls; lowering said ball pickup tool into said solder ball reservoir; providing a reservoir containing attachment agent; applying vacuum suction from said vacuum source to said at least one orifice to attract and hold at least one solder ball of said plurality of solder balls within each of said at least one orifice; removing said ball pickup tool and said at least one solder ball from said solder ball reservoir while retaining said vacuum suction; shutting off said vacuum suction; and applying a puff of gas pressure from said pressure source to said at least one orifice to remove said at least one solder ball from said at least one orifice.