Patent ID: 11882656
Assignee: IBIDEN CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A wiring substrate, comprising:
a first conductor layer;
an insulating layer formed on the first conductor layer;
a second conductor layer formed on the insulating layer;
a connection conductor penetrating through the insulating layer such that the connection conductor is connecting the first conductor layer and the second conductor layer; and
a coating film formed on a surface of the first conductor layer such that the coating film is adhering the first conductor layer and the insulating layer,
wherein the first conductor layer includes a conductor pad in contact with the connection conductor such that the conductor pad has a surface having a first region and a second region on a second conductor layer side and that a surface roughness of the first region is different from a surface roughness of the second region, and the first conductor layer is formed such that the first region of the conductor pad is covered by the coating film and that the second region of the conductor pad is covered by the connection conductor.