Patent ID: 9253881
Filing Date: 2016-02-02
CPC Classification: H05K

Claim Text:
1. A multilayer flexible substrate comprising: a first structural layer including at least one resin sheet including a first insulating layer, a first wiring conductor provided on a principal surface of the first insulating layer, and first filled vias provided in the first insulating layer; and a second structural layer which is provided on a portion of a principal surface of the first structural layer and which includes at least one resin sheet including a second insulating layer, a second wiring conductor provided on a principal surface of the second insulating layer, and a second filled via disposed in the second insulating layer; wherein the multilayer flexible substrate includes a rigid region including a portion of the first structural layer and the second structural layer and a flexible region that is more flexible than the rigid region and including another portion of the first structural layer; the first filled vias are provided in the rigid region and in the flexible region; the first filled vias provided in the flexible region have a higher porosity than the second filled via provided in the second structural layer.