Patent ID: 9049808
Filing Date: 2015-06-02
Classification: H01L,H05K,Y10T

Abstract:
1. A printed wiring board, comprising: a core substrate formed of a single layer having a thickness in a range of from about 0.06 mm to about 0.40 mm and a thermal expansion coefficient α in a range of from 5×10 a first conductive circuit formed directly on a first surface of the core substrate; a second conductive circuit formed directly on a second surface of the core substrate on an opposite side with respect to the first surface; a through-hole conductor formed in a penetrating hole extending from the first surface to the second surface of the core substrate and connecting the first conductive circuit and the second conductive circuit; at least one first interlayer insulation layer formed on the first surface of the core substrate; and at least one second interlayer insulation layer formed on the second surface of the core substrate, wherein the core substrate, the first interlayer insulation layer and the second interlayer insulation layer satisfy an equation, α/(E×(a+b+c))=0.5×10