Patent ID: 8749046

Claim:
A wiring substrate comprising: an insulating layer having an insulating layer surface which defines an outer surface of the wiring substrate; a first electrode pad embedded in the insulating layer and having a first exposed surface which is exposed from the insulating layer at the insulating layer surface; a first opposite surface opposite to the first exposed surface; and a first side surface between the first exposed surface and the first opposite surface, wherein the first opposite surface and the first side surface are covered by the insulating layer, and the first electrode pad is provided within a first electrode pad opening defined in the insulating layer; and an electrode seal ring embedded in the insulating layer and having a second exposed surface which is exposed from the insulating layer at the insulating layer surface; a second opposite surface opposite to the second exposed surface; and a second side surface between the second exposed surface and the second opposite surface, wherein the second opposite surface and the second side surface are covered by the insulating layer, the electrode seal ring having a frame shape and surrounding the first electrode pad, and the electrode seal ring is provided within a frame-shaped electrode seal ring opening defined in the insulating layer, wherein a distance between the first exposed surface and the insulating layer surface is different from a distance between the second exposed surface and the insulating layer surface, a distance between the first opposite surface and the insulating layer surface is different from a distance between the second opposite surface and the insulating layer surface, a material of the first exposed surface is different from that of the second exposed surface, and a width of the first exposed surface is less than a width of the second exposed surface, and a width of the first electrode pad opening at the insulating layer surface is less than a width of the electrode seal ring opening at the insulating layer surface.