Patent ID: 6835260
Filing Date: 2004-12-28
Classification: B32B,C04B,H01L,H05K,Y10T

Abstract:
A method to produce a raised pedestal on a ceramic substrate fired under a constraining force comprising the steps of:providing a non-sintering contact sheet; forming an opening in said non-sintering contact sheet, said opening corresponding to a cross-section dimension of the desired pedestal and having a perimeter; providing a first set of greensheets; placing said non-sintering contact sheet with opening on top of said first set of greensheets; providing a second set of greensheets on top of said non-sintering contact sheet with opening to form a completed layer stack; providing additional non-sintering contact sheets without openings on the top and bottom of said completed layer stack, wherein said additional non-sintering contact sheets have clearance holes for locating fiducials on a surface of the ceramic substrate; firing said completed layer stuck under a constraining load to form a ceramic substrate; removing said additional non-sintering contact sheets; cutting channels in said ceramic substrate corresponding in position to said perimeter of said opening in said non-sintering contact sheet, the depth of said channels being sufficient to contact said patterned non-sintering contact sheet; and selectively removing the ceramic material above said non-sintering contact sheet to form a raised pedestal on said ceramic substrate.