Patent ID: 6574863
Filing Date: 2003-06-10
Classification: H05K,Y10T

Abstract:
A method of making a thin core substrate for constructing a build-up multilayer circuit board, comprising:providing an insulating layer having a first surface and a second surface opposite said first surface; providing a first electrically conductive sheet being bonded to said first surface of said insulating layer, and a second electrically conductive sheet being bonded to said second surface of said insulative layer; removing the conductive material in both of said first and second electrically conductive sheets and the insulating material in said insulating layer at the same predetermined positions to form a plurality of blind vias; depositing an electrically conductive layer covering said blind vias and at least a portion of said electrically conductive sheets; and patterning said first, second electrically conductive sheets and said electrically conductive layer to form circuit layers.