Patent ID: 9578738
Date: 2017-02-21
CPC Classifications: H05K

Claim:
1. A wiring board, comprising: an inorganic insulating layer; a conductive layer disposed on part of one main surface of the inorganic insulating layer; a first resin layer disposed on another part of the one main surface of the inorganic insulating layer, the first resin layer covering side surfaces of the conductive layer and one main surface of the conductive layer on a side opposite to the inorganic insulating layer, a second resin layer disposed on the other main surface of the inorganic insulating layer, the part of the one main surface of the inorganic insulating layer including a plurality of first recessed portions each of which has at least partially circular shape in a plan view, part of the conductive layer entering into the plurality of first recessed portions, the another part of the one main surface of the inorganic insulting layer includes a plurality of second recessed portions each of which has at least partially circular shape in a plan view, wherein part of the first resin layer enters into the plurality of second recessed portions, the inorganic insulting layer further includes a plurality of second inorganic insulating particles having a particle diameter larger than that of the first inorganic insulating particles, the respective second inorganic insulting particles are partly connected to the first inorganic insulating particles, and the second inorganic insulating particles are separated from each other with the first inorganic insulating particles interposed therebetween, and a plurality of regions between the first recessed portions in the inorganic insulating layer are composed of only the first inorganic insulating particles among the first inorganic insulating particles and the second inorganic insulating particles.