Patent ID: 6213386
Filing Date: 2001-04-10
Classification: B23K,H01L,H05K

Abstract:
A method of forming bumps in which conductive spheres are used to form bumps on a semiconductor device, comprising the steps of:aligning a tool having through-holes with said semiconductor device so that said through-holes can be opposed to the places where said bumps are to be formed;supplying said conductive spheres on said tool, charging said conductive spheres into said through-holes of said tool and removing said tool from said semiconductor device as a ball charging process; andheating said conductive spheres and said semiconductor devices,wherein on the side of the tool where said conductive spheres are supplied the diameter of said through-holes of said tool is equal to or larger than the diameter of said conductive spheres used and less than twice that of said conductive spheres, and on the device side of the tool the diameter of said through-holes is equal to or larger than that of said conductive spheres used.