Patent ID: 9117730
Filing Date: 2015-08-25
Classification: H01L,H05K,Y10T

Abstract:
1. A printed wiring board, comprising: a core substrate; a first conductive pattern formed on the core substrate; an insulation structure comprising a first insulation layer and formed on the core substrate such that the first insulation layer covers the first conductive pattern; a second conductive pattern formed on the insulation structure; and a second insulation layer formed on the insulation structure such that the second insulation layer covers the second conductive pattern, wherein the core substrate has a through hole conductor formed through the core substrate such that the through hole conductor is connected to the first conductive pattern, the insulation structure has a via conductor formed on the through hole conductor and connecting the first conductive pattern and the second conductive pattern through the first insulation layer, the first insulation layer includes a first layer comprising a reinforcing fiber material and a second layer formed on the first layer such that the first layer is positioned on a core substrate side and the second layer is positioned on a second insulation layer side, the reinforcing fiber material in the first layer of the first insulation layer includes a portion penetrating into the via conductor, and the second layer of the first insulation layer is made of an insulating material which is a same material as an insulating material forming the second insulation layer.