Patent ID: 6268275
Filing Date: 2001-07-31
Classification: H01L,H05K,Y10T

Abstract:
A method for placing an array of conductive spheres on prefluxed bond pads of a substrate, said method comprising:providing a substrate having a surface with a first pattern of bond pads;providing a stencil plate having upper and lower surfaces with a second pattern of through-holes therethrough, said second pattern of through-holes corresponding to said first pattern of bond pads;providing a hopper with an open top and configured to receive, hold and dispense conductive spheres as said hopper is closely moved across said upper surface of said stencil plate;placing said stencil plate over said substrate to align said patterns; andmoving said hopper across the upper surface of said stencil plate to a position beyond said pattern of through-holes to drop conductive spheres through said through-holes onto said bond pads.