Patent ID: 9655248
Date: 2017-05-16
CPC Classifications: H01L,H05K,Y10T

Claim:
1. A method of manufacturing a wiring board, comprising the steps of: preparing an insulating layer including a cavity formation region and a wiring formation region surrounding the cavity formation region, and a separable metallic foil formed of a first metallic foil and a second metallic foil which are brought into intimate contact with each other in a separable manner; allowing the separable metallic foil to adhere to an upper side and a lower side of the insulating layer with the first metallic foil serving as an adhering surface; forming a blast resist including an opening for exposing the separable metallic foil in the cavity formation region on a surface of the separable metallic foil adhering to the upper side of the insulating layer; removing by etching the separable metallic foil on the upper side of the insulating layer exposed in the opening of the blast resist; digging the insulating layer exposed in the opening of the blast resist from above by blasting, and forming a cavity having a depth that reaches the second metallic foil on the lower side of the insulating layer but does not penetrate the second metallic foil; removing the blast resist from the separable metallic foil on the upper side; injecting a fixing resin into the cavity; inserting an electronic component into the cavity into which the fixing resin is injected, and fixing the electronic component by curing the fixing resin; peeling off the second metallic foil from an intimate contact surface with the first metallic foil; and forming a wiring conductor using a part of the first metallic foil in the wiring formation region.