Patent ID: 9723728
Date: 2017-08-01
CPC Classifications: H05K

Claim:
1. A wiring board with a built-in electronic component, comprising: a substrate having a cavity; an electronic component accommodated in the cavity of the substrate; a conductive layer formed on the substrate such that the conductive layer is extending over the electronic component in the cavity of the substrate; and a solder-resist layer formed on the conductive layer and having a plurality of first opening portions and a plurality of second opening portions such that the plurality of first opening portions is forming a plurality of first conductive pads comprising the conductive layer exposed by the plurality of first opening portions and that the plurality of second opening portions is forming a plurality of second conductive pads comprising the conductive layer exposed by the plurality of second opening portions, wherein the plurality of second conductive pads is formed such that the plurality of second conductive pads comprises a plurality of portions of the conductive layer formed directly over the electronic component, respectively, and connected to the electronic component, the plurality of first conductive pads is formed such that the plurality of first conductive pads comprises a plurality of portions of the conductive layer formed on an outer side with respect to the electronic component, respectively, each of the second opening portions has an opening diameter which is formed smaller than an opening diameter of each of the first opening portions, each of the first opening portions has the opening diameter which is formed in a range of from 40 μm to 80 μm, and each of the second opening portions has the opening diameter which is formed in a range of from 20 μm to 30 μm.