Patent ID: 8530751
Filing Date: 2013-09-10
Classification: H01L,H05K

Abstract:
1. A multilayer wiring substrate comprising a laminate structure in which a plurality of resin insulation layers, and a plurality of conductor layers are laminated alternately in multilayer arrangement, a plurality of IC chip connection terminals to which an IC chip is to be connected being disposed on a first main surface side of the laminate structure where a first main surface thereof is present, a plurality of motherboard connection terminals to which a motherboard is to be connected being disposed on a second main surface side of the laminate structure where a second main surface thereof is present, the plurality of conductor layers being interconnected by means of via conductors formed in the plurality of resin insulation layers such that their diameters increase toward the first main surface or the second main surface, wherein: the plurality of resin insulation layers include first-type resin insulation layers formed of a build-up material primarily formed of a resin insulation material, and one or more second-type resin insulation layer formed of a build-up material which comprises an inorganic material in an amount greater than the amount of the inorganic material in the build-up material used to form the first-type resin insulation layers and whose thermal expansion coefficient is smaller than that of the first-type resin insulation layers; on a cross section of the laminate structure taken along a thickness direction thereof, a ratio of a total thickness of the one or more second-type resin insulation layers located in a first area between a center line and the second main surface to a thickness corresponding to the first area is greater than a ratio of a total thickness of the one or more second-type resin insulation layers located in a second area between the center line and the first main surface to a thickness corresponding to the second area, the center line being set at a location where a distance between the center line and the first main surface equals a distance between the center line and the second main surface; and the laminate structure is warped such that the laminate structure is convex toward the second main surface side.