Patent ID: 6276599
Filing Date: 2001-08-21
Classification: H01L,H05K

Abstract:
A method of forming solder bumps on pads formed on a surface of a base material, the method comprising:supplying solder to a template having a number of through holes formed to correspond to the pads of the base material, respectively, such that the through holes are filled with the solder;scraping the sides of the template by doctors to remove an excessive amount of the solder;positioning the template in an opposing relationship relative to the base material so that the pads are aligned with the through holes, respectively;engaging a side of the template, disposed opposite relative to the base material, with a pressure housing so as to cover at least a portion of the template that includes the through holes; andsuppling inert gas to an interior of the pressure housing in order to increase the pressure in the interior of the pressure housing such that a difference in pressure between an exterior and the interior of the pressure housing extrudes the solder from the template to the pad side of the base material.