Patent ID: 9202781
Filing Date: 2015-12-01
Classification: H01L,H05K

Abstract:
1. A wiring substrate comprising: a core layer having one and another surfaces and including a plate-shaped member formed of an aluminum oxide and a plurality of linear conductors penetrating the plate-shaped member in a thickness direction of the plate-shaped member; a first wiring layer formed on the one surface of the core layer; a second wiring layer formed on the other surface of the core layer; and a first insulating layer having a same thickness as the first wiring layer and formed in an area of the one surface of the core layer on which the first wiring layer is not formed; wherein the first and second wiring layers are positioned superposing each other in a plan view, wherein the first and second wiring layers are electrically connected by way of the plurality of linear conductors, wherein the plurality of linear conductors have first end surfaces provided on a side of the one surface of the core layer and second end surfaces provided on a side of the another surface of the core layer, wherein the second end surfaces are recessed relative to the another surface of the core layer, wherein the plate-shaped member includes a plurality of through-holes that are filled by the plurality of linear conductors, wherein the first end surfaces are flush with one surface of the plate-shaped member, wherein the second end surfaces are recessed relative to another surface of the plate-shaped member, so that recess parts are formed by the second end surfaces and inner wall surfaces of the plurality of through-holes, wherein the recess parts are formed on the another surface of the plate-shaped member in positions that are opposite to the first wiring layer from the plan view and positions that are opposite to the first insulating layer from the plan view, and wherein a part of the second wiring layer is formed in the recess parts in positions that are opposite to the first wiring layer from the plan view.