Patent ID: 9642246
Date: 2017-05-02
CPC Classifications: H05K

Claim:
1. A printed circuit board comprising: a core insulating layer having a first via hole; a first via filling the first via hole formed through the core insulating layer; a first insulating layer on the core insulating layer, the first insulating layer including a first circuit pattern groove; a first circuit pattern filling the first circuit pattern groove of the first insulating layer; a second insulating layer on the first insulating layer and having a second via hole; a second via filling the second via hole formed through the second insulating layer; a third insulating layer on the second insulating layer, the third insulating layer including a second circuit pattern groove; and a second circuit pattern filling the second circuit pattern groove of the third insulating layer, wherein a thickness of the first insulating layer is equal to a thickness of the first circuit pattern, wherein a thickness of the core insulating layer is equal to a thickness of the first via, wherein the first insulating layer is thinner in thickness than the core insulating layer, wherein a thickness of the second insulating layer is equal to a thickness of the second via, wherein a thickness of the third insulating layer is equal to a thickness of the second circuit pattern, wherein each of the first and third insulating layers includes a first resin material into which a glass fiber is not impregnated and a filler distributed in the first resin material, and wherein each of the core and second insulating layers includes a second resin material into which the glass fiber is impregnated and a filler distributed in the second resin material.