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

Claim 14:
15. A method for manufacturing a wiring substrate, comprising:
forming a first conductor layer having a conductor pad on a first insulating layer;
roughening an exposed surface of the first conductor layer formed on the first insulating layer;
forming a coating film on the first conductor layer such that the coating film covers the first conductor layer;
forming a second insulating layer on the first conductor layer and the coating film formed on the first conductor layer;
forming a second conductor layer on the second insulating layer; and
forming a connection conductor in the second insulating layer such that the connection conductor penetrates through the second insulating layer and connects the conductor pad and the second conductor layer,
wherein the roughing of the exposed surface of the first conductor layer includes forming a surface of the conductor pad having a first region and a second region on an opposite side with respect to a first insulating layer side such that a surface roughness of the first region is different from a surface roughness of the second region, the forming of the coating film includes covering the first region with the coating film, and the forming of the connection conductor includes covering the second region with the connection conductor.