WIRING SUBSTRATE HAVING COLUMNAR PROTRUDING PART

摘要

PURPOSE: A wiring board including a pillar shape protrusion is provided to improve the connection reliability by including the protrusion functions as at least part of the connection terminal of the wiring board. CONSTITUTION: A first metal layer including a pillar shape through hole is formed on one side of a supporting unit. The surface of the supporting unit is exposed by the through hole. The through hole is filled by a pillar shape metal layer. An insulting layer(12a) is formed on the pillar shape metal layer and the first metal layer. A wiring layer is formed on one side of the insulating layer. The supporting unit and the first metal layer are eliminated a protrusion is protruded from one side of the insulating layer.