Patent ID: 11935801
Assignee: IBIDEN CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method for manufacturing an electronic component built-in wiring board, comprising:
forming a structure comprising a substrate having a cavity, an electronic component accommodated in the cavity of the substrate and having a plurality of pads on a surface of the electronic component, a coating insulating layer comprising an insulating material and formed on the substrate such that the coating insulating layer is covering the electronic component and has a plurality of via holes, and a resin coating comprising a resin material and formed between the electronic component and the coating insulating layer and entirely between the substrate and the coating insulating layer such that the resin coating has a plurality of through holes partially exposing the plurality of pads in the plurality of via holes respectively; and
forming a plurality of via conductors in the plurality of via holes and the plurality of through holes respectively such that the plurality of via conductors is connected to the plurality of pads on the surface of the electronic component,
wherein the coating insulating layer comprises resin and is formed such that the resin of the coating insulating layer is filling a space between an inner surface of the cavity and the electronic component accommodated in the cavity, the resin material of the resin coating is different from the insulating material of the coating insulating layer such that the resin coating has an adhesion to the electronic component that is stronger than an adhesion of the coating insulating layer to the electronic component, and the resin coating is formed such that the resin coating is formed on the surface and a side surface of the electronic component, on an inner surface of the cavity, and on a bottom surface of the cavity between the inner surface of the cavity and the side surface of the electronic component.