Patent ID: 6109509
Filing Date: 2000-08-29
Classification: B23K,H01L,H05K

Abstract:
A method of mounting conductive balls onto pads of a workpiece, comprising the steps of:applying a vacuum to a hollow suction head so as to effect a vacuum in an internal space therein;introducing said suction head into a conductive balls supply part so as to suction the conductive balls to suction holes which are formed in a lower surface of said suction head and which are in communication with said internal space;introducing said suction head to said workpiece so as to place said conductive balls suctioned to said suction holes into contact with said pads of said workpiece;releasing the vacuum in said internal space while effecting a positive pressure which is higher than atmospheric pressure in said internal space and while holding said suction head in a position so as to prevent said conductive balls from being displaced from said pads by air jetted from said suction holes of said suction head in which said positive pressure is effected;lowering the pressure of said internal space from said positive pressure to atmospheric pressure while holding said suction head in said position so as to keep said conductive balls from being displaced until atmospheric pressure is effected in said internal space; andremoving said suction head from said workpiece while leaving said conductive balls on said pads of said workpiece.