Patent ID: 7302757
Filing Date: 2007-12-04
Classification: H01L,H05K,Y10T

Abstract:
1. A method for creating micro-bumps on metal contact pads comprising the steps of: providing a plurality of glass ceramic greensheets, stacking said plurality of glass ceramic greensheets, said stack of glass ceramic greensheets having a bottom surface glass ceramic greensheet layer containing bottom surface metal contact pads, wherein the metal contact pads have an exterior surface extending beyond the bottom surface glass ceramic greensheet layer, providing an alumina contact sheet having through holes, said through holes configured to the location and pitch of the desired micro-bumps, placing said alumina contact sheet first in contact with said metal contact pad exterior surface and subsequently forcing the alumina contact sheet into contact with said bottom surface glass ceramic greensheet layer thereby extruding at least a portion of the metal contact pad into the through holes to form micro-bumps on the metal contact pad exterior surface, and laminating said stack of glass ceramic greensheets and contact sheet to create a laminate.