Patent ID: 9538650
Date: 2017-01-03
CPC Classifications: H01L,H05K,Y02P

Claim:
1. A wiring substrate comprising: an insulating base layer; an insulating layer laminated on the base layer, the insulating layer having a first surface with an opening, and a second surface located within the opening and being concave toward the base layer in relation to the first surface; and an electrically conductive connection terminal projecting from the insulating layer inside the opening, wherein the second surface extends from the first surface to the connection terminal inside the opening; on a cut surface which is a flat surface extending along a lamination direction in which the insulating layer is laminated on the base layer, an angle which is larger than 0° but smaller than 90° is formed between a normal line extending outward from an arbitrary point on the second surface and a parallel line extending from the arbitrary point toward the connection terminal in parallel to the first surface, with the angle larger than 0° but smaller than 90° at all points on the second surface; and the second surface has a surface roughness greater than that of the first surface.