Abstract: A printed wiring board includes a conductor layer including wirings, a resin insulating layer having openings, a mounting conductor layer including first and second electrodes, first via conductors including a seed layer and an electrolytic plating layer such that the first via conductors connect the first electrodes and the wirings, and second via conductors including the seed layer and electrolytic plating layer such that the second via conductors connect the second electrodes and the wirings. The first electrodes are positioned to mount a first electronic component. The second electrodes are positioned to mount a second electronic component. The first and second via conductors are formed such that the seed layer is covering an inner wall surface of each opening in the insulating layer and has a first portion and a second portion connected to the first portion and having a part of the first portion formed on the second portion.

Abstract: A printed wiring board includes a mounting conductor layer including first and second electrodes, a connection conductor layer including connection wirings such that the connection wirings connect the first and second electrodes, a resin insulating layer formed between the mounting conductor layer and the connection conductor layer and having openings, and connection via conductors formed in the openings of the resin insulating layer and including first and second connection via conductors such that the first connection via conductors electrically connect the first electrodes and the connection wirings and the second connection via conductors electrically connect the second electrodes and the connection wirings. The resin insulating layer includes inorganic particles and resin. The inorganic particles include first inorganic particles forming inner wall surfaces in the openings and second inorganic particles embedded in the resin insulating layer.

Abstract: A wiring substrate includes a core substrate including a through-hole conductor, a resin insulating layer formed on the core substrate, a conductor layer formed on a surface of the resin insulating layer and including a seed layer and an electrolytic plating layer formed on the seed layer, and a via conductor formed in the resin insulating layer such that the via conductor is connected to the through-hole conductor in the core substrate and includes the seed layer and electrolytic plating layer extending from the conductor layer. The core substrate includes a glass substrate such that the through-hole conductor is formed in a through hole penetrating through the glass substrate, and the conductor layer and via conductor are formed such that the seed layer is formed by sputtering and includes an alloy including copper, aluminum, and one or more metals selected from nickel, zinc, gallium, silicon, and magnesium.

Abstract: A wiring substrate includes a core substrate including a glass substrate and a through-hole conductor formed in the glass substrate, a resin insulating layer formed on the core substrate and including resin and inorganic particles, a conductor layer formed on the insulating layer and including a seed layer and an electrolytic plating layer, and a via conductor formed in the insulating layer such that the via conductor is electrically connected to the through-hole conductor formed in the glass substrate and includes the seed layer and electrolytic plating layer extending from the conductor layer. The conductor layer and the via conductor are formed such that the seed layer is formed by sputtering, and the resin insulating layer has an opening in which the via conductor is formed such that the inorganic particles include first particles forming an inner wall surface in the opening and second particles embedded in the insulating layer.

Abstract: A printed wiring board includes a first conductor layer, a resin insulating layer including resin and inorganic particles, a second conductor layer including a seed layer and an electrolytic plating layer on the seed layer, and a via conductor connecting the first conductor layer and second conductor layer and including the seed layer and electrolytic plating layer extending from the second conductor layer. The second conductor layer and via conductor are formed such that the seed layer includes an alloy including copper, aluminum and a metal including one or more metals selected from nickel, zinc, gallium, silicon and magnesium, and the resin insulating layer is formed such that the inorganic particles include first inorganic particles forming an inner wall surface in the opening and second inorganic particles embedded in the resin insulating layer and that shapes of the first inorganic particles are different from shapes of the second inorganic particles.

Abstract: A wiring substrate includes a first build-up part including first insulating layers and conductor layers, a second build-up part laminated to the first part and including second insulating layers and conductor layers, and via conductors including first via conductors in the first insulating layers and second via conductors in the second insulating layers. The first part is positioned closer to first surface side of the substrate than the second part. The first conductor layers include wirings having wiring width and inter-wiring distance that are smaller than wiring width and inter-wiring distance of wirings in the second conductor layers. The first insulating layers include resin and inorganic particles including first particles forming inner wall surfaces in through holes and second particles embedded in the first insulating layers having different shapes from the first particles. Each first conductor layers and via conductors includes a metal film layer and a plating film layer.

Abstract: A printed wiring board includes an insulating layer, a conductor layer formed on the insulating layer and including one or more conductor circuits, an insulating adhesive layer covering a surface of the conductor layer and a part or parts of the insulating layer exposed from the conductor layer, and a resin insulating layer formed on the insulating layer and the conductor layer such that the insulating adhesive layer is sandwiched between the conductor layer and the resin insulating layer. The insulating adhesive layer includes a first portion covering an upper surface of the one or more conductor circuits and a second portion covering a side surface of the one or more conductor circuits and a thickness of the first portion is greater than a thickness of the second portion.

Abstract: A printed wiring board includes a base substrate, an electronic component accommodated in a cavity formed in the substrate, a resin insulating layer formed on the substrate such that the insulating layer is covering the electronic component, a conductor layer formed on the insulating layer, and via conductors formed in the insulating layer and each including a seed layer and an electrolytic plating layer formed on the seed layer such that the via conductors are connecting the conductor layer and electrodes of the electronic component. The insulating layer includes resin and inorganic particles and has via holes in which the via conductors is formed respectively such the inorganic particles include first inorganic particles having smooth surfaces and second inorganic particles embedded in the insulating layer and that an inner wall surface of each of the via holes includes the resin and the smooth surfaces of the first inorganic particles.

Abstract: A printed wiring board includes a laminate including resin insulating layers and conductor layers, and via conductors formed in via holes of the resin insulating layers and each including a seed layer and an electrolytic plating layer formed on the seed layer such that the via conductors connect the conductor layers adjacent to each other and that the via conductors include a first via conductor and a second via conductor formed on the first via conductor in a lamination direction of the laminate. The resin insulating layers include resin and inorganic particles such that the inorganic particles include first inorganic particles having smooth surfaces and second inorganic particles embedded in the resin insulating layers and that an inner wall surface of each of the via holes in the resin insulating layers includes the resin and the smooth surfaces of the first inorganic particles.

Abstract: A printed wiring board includes a first conductor layer, a resin insulating layer having an opening, a second conductor layer including a seed layer and an electrolytic plating layer formed on the seed layer, and a via conductor including the seed layer and the electrolytic plating layer and connecting the first conductor and second conductor layers. The seed layer has a first portion on the surface of the insulating layer, a second portion on an inner wall surface in the opening of the insulating layer, and a third portion on a portion of the first conductor layer exposed by the opening of the insulating layer such that the first portion is thicker than the second portion and the third portion, the second portion has a first film and a second film electrically connected to the first film, and a portion of the first film is formed on the second film.

Abstract: A printed wiring board includes a first conductor layer, a resin insulating layer having an opening, a second conductor layer including a seed layer and an electrolytic plating layer formed on the seed layer, and a via conductor including the seed and electrolytic plating layers and connecting the first and second conductor layers. The seed layer has a first portion on the surface of the insulating layer, a second portion on an inner wall surface in the opening of the insulating layer, and a third portion on a portion of the first conductor layer exposed by the opening of the insulating layer such that the first portion is thicker than the second and third portions, and the insulating layer includes resin and inorganic particles including first particles forming the inner wall surface and second particles embedded in the insulating layer and having shapes different from shapes of the first particles.

Abstract: A printed wiring board includes an insulating layer, a conductor layer formed on the insulating layer and including one or more conductor circuits, an insulating adhesive layer covering a surface of the conductor layer and a part or parts of the insulating layer exposed from the conductor layer, and a resin insulating layer formed on the insulating layer and the conductor layer such that the insulating adhesive layer is sandwiched between the conductor layer and the resin insulating layer. The insulating adhesive layer includes a first portion covering an upper surface of the one or more conductor circuits and a second portion covering a side surface of the one or more conductor circuits and a thickness of the first portion is greater than a thickness of the second portion.

Abstract: A printed wiring board includes a first conductor layer, an insulating layer formed on the first conductor layer, a second conductor layer formed on the insulating layer, and a via conductor formed in the insulating layer such that the via conductor is connecting the first and second conductor layers. The insulating layer has opening exposing portion of the first conductor layer such that the via conductor is formed in the opening, the second conductor layer and via conductor are formed such that the second conductor layer and via conductor include a seed layer and an electrolytic plating layer on the seed layer, and the insulating layer includes resin and inorganic particles dispersed in the resin such that the particles include first particles forming inner wall surface in the opening and second particles embedded in the insulating layer and the first particles have shapes different from shapes of the second particles.