Patent ID: 9560768
Date: 2017-01-31
CPC Classifications: H01L,H05K

Claim:
1. A wiring substrate, comprising: a core layer having a hole penetrating therethrough in a thickness direction thereof, and having a projecting part projecting from an inner wall of the hole toward an inner space of the hole, the projecting part being situated at a border that divides a plurality of areas in the hole; a plurality of electronic components disposed in the areas, respectively, the electronic components being arranged at a spaced interval with the projecting part therebetween; and a resin layer filling the hole and supporting the electronic components, wherein a thickness of the projecting part in the thickness direction of the core layer decreases toward a tip of the projecting part, and a central portion of the projecting part in the thickness direction of the core layer projects furthest into the hole, and wherein the inner wall of the hole has a tapered cross-section in the thickness direction of the core layer, the tapered cross-section having a tip situated at a center in the thickness direction of the core layer, and the tapered cross-section is formed along an entire perimeter of the hole to project into the hole and also to form the projecting part situated at the border between the areas, the projecting part having a rhombus shape in a cross-section perpendicular to a direction in which the projecting part projects into the hole.