Patent ID: 11864316
Assignee: FUJIKURA LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A wiring substrate comprising:
a first insulating layer having a first surface and a second surface positioned on a side opposite to the first surface;
a first conductor layer formed on the first surface of the first insulating layer;
a plurality of filled vias formed inside the first insulating layer,
a second insulating layer laminated to face the second surface of the first insulating layer and having a third surface which faces the second surface of the first insulating layer and a fourth surface which is positioned on a side opposite to the third surface; and
a second conductor layer formed on the fourth surface of the second insulating layer, wherein
the plurality of filled vias each have a structure in which a via hole penetrating the first insulating layer is filled with a metal,
the first conductor layer includes a pad which overlaps the plurality of filled vias in a plan view from a thickness direction of the first insulating layer and is connected to the plurality of filled vias,
the second insulating layer has a through hole which overlaps the plurality of filled vias in the plan view,
a plated layer for electrically connecting the second conductor layer and the plurality of filled vias is formed on an inner surface of the through hole,
the plated layer has an inner surface part formed on inner circumferential surfaces of the through hole,
a shape of the inner surface part is cylindrical, and
an inside of the inner surface part is hollow.