Patent ID: 11887767
Assignee: IBIDEN CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An inductor built-in substrate, comprising:
a core substrate having an opening and a first through hole;
a first copper foil formed on a first side of the core substrate;
a first plating film formed in the first through hole of the core substrate;
a second copper foil formed on a second side of the core substrate on an opposite side with respect to the first side;
a magnetic resin body having a second through hole and comprising a magnetic resin filled in the opening of the core substrate; and
a second plating film formed in the second through hole of the magnetic resin body such that the second plating film is formed in contact with the magnetic resin body,
wherein the magnetic resin body is formed in the opening of the core substrate such that the magnetic resin is in direct contact with an inner wall of the core substrate in the opening, and the second plating film is formed such that the second plating film extends on first and second end portions of the magnetic resin body on the first and second sides of the core substrate respectively and extends on the first and second copper foils respectively, and that a thickness of the second plating film formed on the first and second copper foil is larger than a thickness of the second plating film formed on the first and second end portions of the magnetic resin body.