Patent ID: 9018538
Filing Date: 2015-04-28
Classification: H01L,H05K,Y10T

Abstract:
1. A wiring substrate, comprising: an insulating layer; an interconnection layer formed on a first surface of the insulating layer; and a columnar protruding part protruding from a second surface of the insulating layer opposite the first surface, the columnar protruding part electrically connected to the interconnection layer, wherein the columnar protruding part is a connection terminal made of metal, and has a lower face part and an upper face part, the lower face part being buried in the insulating layer, and the upper face part protruding from the second surface of the insulating layer, wherein the lower face part buried in the insulating layer has a rectangular cross-section taken along a plane parallel to an upper face and a lower face of the columnar protruding part, wherein the upper face part protruding from the second surface of the insulating layer has a cross-section taken along a plane parallel to the upper face and the lower face which cross-section is rectangular and narrower than the rectangular cross-section of the lower face part buried in the insulating layer, and wherein the columnar protruding part is a single-layered structure including a protruding part corresponding to the upper face part and a buried part corresponding to the lower face part, the protruding part having a narrower cross-section than the buried part, and the single-layered structure has a step at a border between the protruding part and the buried part, a face of the step being flush with the second surface of the insulating layer.