Patent ID: 9237656
Filing Date: 2016-01-12
CPC Classification: H05K,Y10T

Claim Text:
1. A method of manufacturing a multi-layer wiring board, comprising: forming, on a supporting substrate, a first laminated structure in which at least one conductor layer and at least one resin insulating layer are alternately formed; forming a core substrate on the first laminated structure so as to come into contact with a conductor layer which is an uppermost layer of the first laminated structure; forming a through hole in the core substrate on which a metal layer is provided on its upper main surface by emitting laser light to the core substrate; removing a portion of the metal layer which is disposed immediately above a portion of the core substrate in which the through hole will be formed before the laser light is emitted to the core substrate; forming a through hole metal layer on at least an inner circumferential surface of the through hole; forming a second laminated structure in which at least one conductor layer and at least one resin insulating layer are alternately formed on the core substrate having the through hole metal layer formed thereon; and removing the supporting substrate from the first laminate structure, wherein a thickness of the conductor layer which is the uppermost layer of the first laminated structure is greater than a thickness of other conductor layers.