Patent ID: 6730859
Filing Date: 2004-05-04
Classification: H05K,Y10T

Abstract:
A substrate for mounting an electronic part or parts thereon comprising a core substrate and at least a set of insulation layer and a patterned wiring line layer which is formed on the insulation layer, said set of insulation layer and patterned wiring line layer being positioned at at least one of two opposed sides of the core substrate, the core substrate having holes, in each of which a lead pin of the electronic part is to be inserted, and said core substrate being provided with lands which surround an opening of each of the holes and to which the lead pin inserted in the hole is to be bonded, wherein the insulation layer or insulation layers located at at least one side of the core substrate has bores having a diameter larger than the diameter of the holes so as to expose the land and communicate with the hole surrounded by the land, at the bottom of the bores;wherein the holes, in which the lead pin of the electronic part is to be inserted, have a closed end at the side of the core substrate opposed to the side on which the electronic parts are to be mounted and the holes have an inside wall on which a conductor layer is formed, the conductor layer being led to the land.