Patent ID: 6231707
Filing Date: 2001-05-15
Classification: H01L,H05K,Y10T

Abstract:
A method of forming a multilayer ceramic substrate, the method comprising the steps of:obtaining a plurality of greensheets, each of the greensheets comprising a binder material and ceramic particles;punching a plurality of vias in each of the greensheets, the pattern and number of vias in each of the greensheets being the same, the plurality of vias in each of the greensheets consisting of a first plurality of vias and a second plurality of vias;filling the first plurality of vias in each of the greensheets with an electrically conducting paste;avoiding the filling of the second plurality of vias in each of the greensheets with a paste comprising metallic or ceramic particles;filling at least some of the second plurality of vias in at least one of the greensheets with a fugitive material;stacking the plurality of greensheets in a predetermined order to form an unsintered multilayer ceramic substrate; andsintering the unsintered multilayer ceramic substrate, wherein the binder material and fugitivematerial are removed, thereby resulting in a sintered multilayer ceramic substrate.