Patent ID: 9320148
Filing Date: 2016-04-19
CPC Classification: H01L,H05K

Claim Text:
1. A printed wiring board, comprising: a core substrate having a penetrating hole extending through the core substrate; an electronic component accommodated in the penetrating hole of the core substrate; a filler resin filling a clearance between the electronic component and the core substrate; a first resin insulation layer formed on the electronic component and a first surface of the core substrate; and a second resin insulation layer formed on the electronic component and a second surface of the core substrate on an opposite side of the first surface of the core substrate, wherein the electronic component is an IC chip including a substrate, a die pad formed on the substrate, and a rewiring layer formed on the substrate, the rewiring layer includes a resin layer and a conductive layer which is connected to the die pad by a via hole formed in the resin layer, the penetrating hole is configured such that a distance between an inner wall of the penetrating hole and the electronic component is set in a range of from 50 μm to 500 μm, and that an area of the penetrating hole on the first surface of the core substrate is in a range of from 50% to 70% of an area of an external shape of the first surface of the core substrate, the filler resin has an elastic modulus which is set to be lower than 0.2 Gpa and a thermal expansion coefficient which is set to be higher than 100 ppm and lower than 200 ppm, and the core substrate has an elastic modulus which is set to be higher than 30 Gpa, and a thermal expansion coefficient which is set to be lower than 10 ppm.