Abstract: A wiring board includes a first wiring layer formed on one surface of a core layer, a first insulating layer formed on the one surface of the core layer so as to cover the first wiring layer, a via wiring embedded in the first insulating layer, a second wiring layer formed on a first surface of the first insulating layer, and a second insulating layer thinner than the first insulating layer formed on the first surface of the first insulating layer so as to cover the second wiring layer. The first wiring layer comprises a pad and a plane layer provided around the pad. One end surface of the via wiring is exposed from the first surface of the first insulating layer and directly bonded to the second wiring layer. The other end surface of the via wiring is directly bonded to the pad in the first insulating layer.

Abstract: A wiring board includes a first wiring layer formed on one surface of a core layer, a first insulating layer formed on the one surface of the core layer so as to cover the first wiring layer, a via wiring embedded in the first insulating layer, a second wiring layer formed on a first surface of the first insulating layer, and a second insulating layer thinner than the first insulating layer formed on the first surface of the first insulating layer so as to cover the second wiring layer. The first wiring layer comprises a pad and a plane layer provided around the pad. One end surface of the via wiring is exposed from the first surface of the first insulating layer and directly bonded to the second wiring layer. The other end surface of the via wiring is directly bonded to the pad in the first insulating layer.

Abstract: A wiring board includes a first wiring layer formed on one surface of a core layer, a first insulating layer formed on the one surface of the core layer so as to cover the first wiring layer, a via wiring embedded in the first insulating layer, a second wiring layer formed on a first surface of the first insulating layer, and a second insulating layer thinner than the first insulating layer formed on the first surface of the first insulating layer so as to cover the second wiring layer. The first wiring layer comprises a pad and a plane layer provided around the pad. One end surface of the via wiring is exposed from the first surface of the first insulating layer and directly bonded to the second wiring layer. The other end surface of the via wiring is directly bonded to the pad in the first insulating layer.

Abstract: A wiring substrate includes a first wiring structure and a second wiring structure. The first wiring structure includes a first insulating layer, which covers a first wiring layer, and a via wiring. A first through hole of the first insulating layer is filled with the via wiring. The second wiring structure includes a second wiring layer and a second insulating layer. The second wiring layer is formed on an upper surface of the first insulating layer and an upper end surface of the via wiring. The second wiring layer partially includes a roughened surface. The second insulating layer is stacked on the upper surface of the first insulating layer and covers the second wiring layer. The second wiring structure has a higher wiring density than the first wiring structure. The roughened surface of the second wiring layer has a smaller surface roughness than the first wiring layer.

Abstract: A wiring substrate includes a core layer, a first wiring layer, a first insulating layer, a first via wiring, a second wiring layer, a second insulating layer, a second via wiring, a third wiring layer, a third insulating layer, a third via wiring, and a through-wiring. The through-wiring includes upper and lower end surfaces. The upper end surface has an area that is smaller than an area of the lower end surface. The upper surface of the first insulating layer is more flat than the lower surface of the third insulating layer. The second wiring layer has a wiring density that is higher than a wiring density of the first wiring layer.

Abstract: A wiring substrate includes a first wiring structure and a second wiring structure. The first wiring structure includes a first insulating layer, which covers a first wiring layer, and a via wiring. A first through hole of the first insulating layer is filled with the via wiring. The second wiring structure includes a second wiring layer and a second insulating layer. The second wiring layer is formed on an upper surface of the first insulating layer and an upper end surface of the via wiring. The second wiring layer partially includes a roughened surface. The second insulating layer is stacked on the upper surface of the first insulating layer and covers the second wiring layer. The second wiring structure has a higher wiring density than the first wiring structure. The roughened surface of the second wiring layer has a smaller surface roughness than the first wiring layer.

Abstract: A wiring substrate includes a first wiring structure and a second wiring structure. The first wiring structure includes a first insulating layer, which covers a first wiring layer, and a via wiring. A first through hole of the first insulating layer is filled with the via wiring. The second wiring structure includes a second wiring layer and a second insulating layer. The second wiring layer is formed on an upper surface of the first insulating layer and an upper end surface of the via wiring. The second wiring layer partially includes a roughened surface. The second insulating layer is stacked on the upper surface of the first insulating layer and covers the second wiring layer. The second wiring structure has a higher wiring density than the first wiring structure. The roughened surface of the second wiring layer has a smaller surface roughness than the first wiring layer.

Abstract: A wiring board includes first insulating layers; first wiring layers; first via wirings; second insulating layers; second wiring layers; second via wirings; and a solder resist layer, wherein the first insulating layers are composed of non-photosensitive resin, wherein the second insulating layers, and the solder resist layer are composed of photosensitive resin, respectively, wherein the first surface of the uppermost first insulating layer and the first end surface of the first via wiring embedded in the uppermost first insulating layer are polished surfaces, wherein the first end surface of the first via wiring embedded in the uppermost first insulating layer is flush with the first surface of the uppermost first insulating layer, and wherein the wiring density of the second wiring layers is higher than the wiring density of the first wiring layers.

Abstract: A wiring substrate including an insulation layer, a connection terminal projecting from an upper surface of the insulation layer, a protective insulation layer formed on the upper surface of the insulation layer covering a lower side surface of the connection terminal, and a cover layer covering an upper side surface and an upper surface of the connection terminal exposed from the protective insulation layer. The protective insulation layer includes an upper surface defining a protrusion bulged upward around the connection terminal. The protrusion includes a peak, a first slope inclined downward from the peak and extending toward the connection terminal, and a second slope inclined downward from the peak and extending away from the connection terminal. The cover layer further covers the first slope, the peak, and a part of the second slope.

Abstract: A wiring substrate including an insulation layer, a connection terminal projecting from an upper surface of the insulation layer, a protective insulation layer formed on the upper surface of the insulation layer covering a lower side surface of the connection terminal, and a cover layer covering an upper side surface and an upper surface of the connection terminal exposed from the protective insulation layer. The protective insulation layer includes an upper surface defining a protrusion bulged upward around the connection terminal. The protrusion includes a peak, a first slope inclined downward from the peak and extending toward the connection terminal, and a second slope inclined downward from the peak and extending away from the connection terminal. The cover layer further covers the first slope, the peak, and a part of the second slope.

Abstract: A wiring board includes plural terminals, an insulating layer, and recess portions. Each terminal includes a roughened upper surface and a roughened side surface. The insulating layer is formed between the terminals. The upper surfaces of the terminals are exposed. An upper surface of the insulating layer is a concave curved surface. The recess portions are formed in the insulating layer around the terminals so as to partially expose the side surfaces of the terminals.

Abstract: A wiring board includes a first insulating layer coating a first wiring layer. A first through hole is opened in a surface of the first insulating layer and exposes a surface of the first wiring layer. A first via arranged in the first through hole includes an end surface exposed to the surface of the first insulating layer. A gap is formed between the first insulating layer and the first via in the first through hole. A second wiring layer is stacked on the surface of the first insulating layer and the end surface of the first via. The second wiring layer includes a pad filling the gap. The pad is greater in planar shape than the first through hole.

Abstract: A wiring board includes a first wiring layer, a first insulating layer, first via wirings, connection terminals and a protection layer. The first insulating layer is formed with through holes. The first via wirings are formed in the through holes. The connection terminals are electrically connected to the first wiring layer through the first via wirings. The connection terminals protrude upward from the first insulating layer. The protection layer is made of insulating resin which contains photosensitive resin as a main component. The protection layer is formed on an upper surface of the first insulating layer. The protection layer includes first and second protection layers. The first protection layer surrounds the connection terminals. The second protection layer is separated from the first protection layer. The second protection layer is thinner than the first protection layer.

Abstract: A wiring substrate includes, a base wiring substrate including a first wiring layer, a first insulating layer in which the first wiring layer is buried and a first via hole is formed under the first wiring layer, and a second wiring layer formed under the first insulating layer and connected to the first wiring layer through the first via hole, and a re-wiring portion including a second insulating layer formed on the base wiring substrate and having a second via hole formed on the first wiring layer, and a re-wiring layer formed on the second insulating layer and connected to the first wiring layer through the second via hole. The re-wiring layer is formed of a seed layer and a metal plating layer provided on the seed layer, and the seed layer is equal to or wider in width than the metal plating layer.

Abstract: A method of manufacturing a wiring substrate includes: preparing a laminated plate of a metal layer and an insulating layer; adhering the laminated plate to a first support body facing the metal layer; and forming a first wiring layer with vias extending through the insulating layer and first pads exposed from a first surface of the insulating layer. The method also includes: separating a multilayer structure including the metal, insulating, and first wiring layer from the first support body; adhering the multilayer structure to a second support body facing the first wiring layer; removing the metal layer; forming a plurality of second wiring layers including second pads connected to the vias and exposed from a second surface of the insulating layer opposite the first surface; and separating the insulating, the first wiring, and the plurality of second wiring layers from the second support body, to obtain the wiring substrate.

Abstract: A wiring board includes plural terminals, an insulating layer, and recess portions. Each terminal includes a roughened upper surface and a roughened side surface. The insulating layer is formed between the terminals. The upper surfaces of the terminals are exposed. An upper surface of the insulating layer is a concave curved surface. The recess portions are formed in the insulating layer around the terminals so as to partially expose the side surfaces of the terminals.

Abstract: A wiring board includes a first wiring layer, a first insulating layer, first via wirings, connection terminals and a protection layer. The first insulating layer is formed with through holes. The first via wirings are formed in the through holes. The connection terminals are electrically connected to the first wiring layer through the first via wirings. The connection terminals protrude upward from the first insulating layer. The protection layer is made of insulating resin which contains photosensitive resin as a main component. The protection layer is formed on an upper surface of the first insulating layer. The protection layer includes first and second protection layers. The first protection layer surrounds the connection terminals. The second protection layer is separated from the first protection layer. The second protection layer is thinner than the first protection layer.

Abstract: A wiring substrate includes first and second wiring structures. The first wiring structure includes a core substrate, first and second insulation layers each formed from a thermosetting insulative resin including a reinforcement material, and a via wire formed in the first insulation layer. The second wiring structure includes a wiring layer formed on upper surfaces of the first insulation layer and the via wire, an insulation layer formed on the upper surface of the first insulation layer, and an uppermost wiring layer including a pad used to electrically connect a semiconductor chip and the wiring layer. An outermost insulation layer stacked on a lower surface of the second insulation layer exposes a portion of a lowermost wiring layer stacked on the lower surface of the second insulation layer as an external connection pad. The second wiring structure has a higher wiring density than the first wiring structure.

Abstract: A wiring substrate includes a first wiring structure and a second wiring structure. The first wiring structure includes a first insulating layer, which covers a first wiring layer, and a via wiring. A first through hole of the first insulating layer is filled with the via wiring. The second wiring structure includes a second wiring layer and a second insulating layer. The second wiring layer is formed on an upper surface of the first insulating layer and an upper end surface of the via wiring. The second wiring layer partially includes a roughened surface. The second insulating layer is stacked on the upper surface of the first insulating layer and covers the second wiring layer. The second wiring structure has a higher wiring density than the first wiring structure. The roughened surface of the second wiring layer has a smaller surface roughness than the first wiring layer.

Abstract: A wiring substrate includes a core layer, a first wiring layer, a first insulating layer, a first via wiring, a second wiring layer, a second insulating layer, a second via wiring, a third wiring layer, a third insulating layer, a third via wiring, and a through-wiring. The through-wiring includes upper and lower end surfaces. The upper end surface has an area that is smaller than an area of the lower end surface. The upper surface of the first insulating layer is more flat than the lower surface of the third insulating layer. The second wiring layer has a wiring density that is higher than a wiring density of the first wiring layer.