Patent ID: 8624128

Claim:
A printed circuit board comprising: a first insulation layer having a first pattern formed thereon; a first trench caved in one surface of the first insulation layer along at least a portion of the first pattern; and a second insulation layer stacked on one surface of the first insulation layer so as to cover the first pattern, wherein the first trench is filled by the second insulation layer, the second insulation layer is integrally formed on the first insulation layer and the first pattern such that a portion of the second insulation layer fills the first trench, the first insulation layer comprises: a base layer made of an insulation material; and a medium layer formed on the base layer and made of an insulation material, the first pattern and the first trench are formed on the medium layer, the first trench is formed by penetrating the medium layer such that a portion of the base layer is exposed by the first trench, and the medium layer is made of a different insulation material from the base layer.