Abstract:
In a build-up step, a plurality of resin insulation layers and a plurality of conductive layers are alternately laminated in multilayer arrangement on a metal foil separably laminated on a side of a base material, thereby forming a wiring laminate portion. In a drilling step, a plurality of openings are formed in an outermost resin insulation layer through laser drilling so as to expose connection terminals. Subsequently, in a desmear step, smears from inside the openings are removed. In a base-material removing step performed after the build-up step, the base material is removed and the metal foil is exposed.
Abstract:
A method of manufacturing a multilayer wiring substrate includes: a first laminate structure formation step of forming a first laminate structure on a support substrate, the first laminate structure including at least one conductor layer and at least one resin insulation layer; a core substrate formation step of laminating a core substrate on the first laminate structure such that a lower main surface of the core substrate comes in contact with the first laminate structure, the core substrate having a metal layer provided on an upper main surface thereof; and a second laminate structure formation step of forming a second laminate structure on the core substrate such that the second laminate structure covers the metal layer, the second laminate structure including at least one conductor layer and at least one resin insulation layer.
Abstract:
To improve the degree of freedom of design of a multilayer wiring substrate incorporating therein an electronic component. A multilayer wiring substrate includes a first layered structure including conductor layers and insulation layers including therein via conductors each having a diameter which decreases from the upper surface of the insulation layer toward the lower surface thereof; an electronic component embedded in the first layered structure; and a second layered structure stacked on the first layered structure, and including conductor layers, and an insulation layer including therein a via conductor having a diameter which decreases from the upper surface of the insulation layer toward the lower surface thereof.
Abstract:
A plurality of openings are formed in a resin insulation layer on a top surface side of a wiring laminate portion, and a plurality of openings are formed in a resin insulation layer on a bottom surface side thereof. A plurality of connection terminals are disposed to correspond to the openings. Peripheral portions of terminal outer surfaces of the connection terminals are covered by the resin insulation layer on the top surface side, and peripheral portions of terminal outer surfaces of the connection terminals are covered by the resin insulation layer on the bottom surface side. Each of the second-main-surface-side connection terminals has a concave portion at the center of the terminal outer surface, and the deepest portion of the concave portion is located on the interior side in relation to the peripheral portion of the terminal outer surface.
Abstract:
Embodiments of the presently-disclosed subject matter include a multilayer wiring substrate including a first laminated structure that includes at least one conductive layer and at least one resin insulating layer; a core substrate that includes a reinforced fiber and that is laminated on the first laminated structure; and a second laminated structure that includes at least one conductive layer and at least one resin insulating layer and that is formed on the core substrate; and a plurality of via conductors which penetrate the first laminated structure, the core substrate, and the second laminated structure in the thickness direction, wherein the plurality of via conductors all expand in diameter in one direction, and the reinforced fiber is located above a center of the core substrate in the thickness direction.
Abstract:
A wiring substrate includes an insulation substrate, a through hole, an upper-surface-side land conductor, a lower-surface-side land conductor, and a through hole conductor. The insulation substrate includes a first insulation layer, a second insulation layer, and a glass fiber layer provided between the first and second insulation layers. The through hole has a diameter which decreases from the upper surface of the insulation substrate toward the interior thereof, which becomes smallest at the glass fiber layer, and which increases from the glass fiber layer toward the lower surface of the insulation substrate. The upper-surface-side land conductor and the lower-surface-side land conductor respectively cover the upper-surface-side and lower-surface-side openings of the through hole. The through hole conductor is formed in the through hole. The upper-surface-side opening of the through hole has a diameter larger than that of the lower-surface-side opening of the through hole, and the upper-surface-side land conductor has a diameter larger than that of the lower-surface-side land conductor.
Abstract:
Embodiments of the presently-disclosed subject matter include a first laminated structure in which at least one conductor layer and at least one resin insulating layer are alternately formed is formed on a supporting substrate, and a core substrate is formed so as to come into contact with the conductor layer which is the uppermost layer of the first laminated structure. Then, laser light is emitted to the core substrate to form a through hole and a metal layer is formed in the through hole. Then, a second laminated structure including at least one conductor layer and at least one resin insulating layer is formed on the core substrate. At that time, the thickness of the conductor layer which is the uppermost layer of the first laminated structure is greater than that of the other conductor layers.