Pastes are disclosed that are configured to coat a passage of a substrate. When the paste is sintered, the paste becomes electrically conductive so as to transmit electrical signals from a first end of the passage to a second end of the passage that is opposite the first end of the passage. The metallized paste contains a lead-free glass frit, and has a coefficient of thermal expansion sufficiently matched to the substrate so as to avoid cracking of the sintered paste, the substrate, or both, during sintering.

A circuit board includes a rigid board including a first wiring layer formed on its upper surface side, and a flexible board including a base material having flexibility and disposed on an upper surface side of the first wiring layer, a second wiring layer formed on the base material, and a via wiring formed in a through-hole passing through the second wiring layer and the base material. The via wiring has a protrusion protruding from an upper surface of the second wiring layer, and extending on the upper surface of the second wiring layer positioned on an outer circumferential side of the through-hole.

A multilayer printed wiring board and a method of manufacturing the same are provided. A multilayer printed wiring board of the present embodiment includes: a core base material formed by laminating a first wiring layer and a first insulating layer in this order on an insulating substrate; and a built-up layer formed by laminating a second wiring layer and a second insulating layer in this order on the core base material. A primer layer is formed between the second wiring layer and the first insulating layer, the second wiring layer has a lower surface at least part of which is in contact with the primer layer, and the second wiring layer has an upper surface and a side surface on both of which a tin-plated layer and a silane coupling layer are formed in this order.

A circuit board includes a substrate, a first magnetic structure, a first dielectric layer and an inductive coil. The substrate has a top surface and a bottom surface. The first magnetic structure is disposed on the top surface of the substrate. The first dielectric layer covers the substrate and the first magnetic structure. The inductive coil includes a first interconnect, a second interconnect and a plurality of conductive pillars. The first interconnect is disposed on the first dielectric layer. The second interconnect is disposed on the bottom surface of the substrate. The conductive pillars connect the first interconnect and the second interconnect. The first interconnect, the second interconnect and the conductive pillars form a helical structure surrounding the first magnetic structure.

An interconnect structure includes a first conductor, a second conductor, a dielectric block, a substrate, and a pair of conductive lines. The first conductor and the second conductor form a differential pair design. The dielectric block surrounds the first conductor and the second conductor. The first conductor is separated from the second conductor by the dielectric block. The substrate surrounds the dielectric block and is spaced apart from the first conductor and the second conductor. The pair of conductive lines is connected to the first conductor and the second conductor, respectively, and extends along a top surface of the dielectric block and a top surface of the substrate.

To provide a method for manufacturing a laminate body with excellent heat resistance (solder heat resistance, for example) and excellent conduction reliability in which a small diameter via hole can be formed. RESOLUTION MEANS To provide a manufacturing method of a laminate body, containing: a step of forming onto a supporting body a curable resin composition layer formed from a thermosetting resin composition to obtain a curable resin composition layer with a supporting body; a step of laminating the aforementioned curable resin composition with a supporting body onto a substrate on a curable resin composition layer forming surface side to obtain a pre-cured composite with a supporting body formed from a substrate and a curable resin composition layer with a supporting body; a step of performing a first heating of the aforementioned composite and thermally curing the aforementioned curable resin composition layer to form a cured resin layer to obtain a cured composite with a supporting body formed from a substrate and a cured resin layer with a supporting body; a step of performing hole punching from the aforementioned supporting body side of the aforementioned cured composite with a supporting body to form a via hole in the aforementioned cured resin layer; a step of peeling the aforementioned supporting body from the aforementioned cured composite with a supporting body to obtain a cured composite formed from a substrate and a cured resin layer a step of removing resin residue in the via hole of the aforementioned cured composite; a step of performing a second heating of the aforementioned cured composite; and a step of forming a conductor layer on an inner wall surface of the via hole of the aforementioned cured composite and on the aforementioned cured resin layer.

Problem: To provide a method for manufacturing a laminate body with excellent heat resistance (solder heat resistance, for example), in which a small diameter via hole can be formed. RESOLUTION MEANS: The provision of a manufacturing method of a laminate body, containing: a step of forming onto a supporting body a curable resin composition layer formed from a thermosetting resin composition to obtain a curable resin composition layer with a supporting body; a step of laminating the aforementioned curable resin composition layer with a supporting body onto a substrate on a curable resin composition layer forming surface side to obtain a pre-curing composite with a supporting body formed from a substrate and a curable resin composition layer with a supporting body; a step of performing a first heating of the aforementioned composite and thermally curing the aforementioned curable resin composition layer to form a cured resin layer to obtain a cured composite with a supporting body formed from a substrate and a cured resin layer with a supporting body; a step of performing hole punching from the aforementioned supporting body side of the aforementioned cured composite with a supporting body to form a via hole in the aforementioned cured resin layer; a step of peeling the aforementioned supporting body from the aforementioned cured composite with a supporting body to obtain a cured composite formed from a substrate and a cured resin layer, a step of performing a second heating of the cured composite; a step of removing resin residue in the via hole of the aforementioned cured composite; and an step of forming a conductor layer on an inner wall surface of the via hole of the aforementioned cured composite and on the aforementioned cured resin layer; wherein the forming of the conductor layer in the via hole is performed via electroless plating or a combination of electroless plating and electrolytic plating.

A wiring substrate includes: a base material; a first through-hole and a second through-hole that are formed in the base material; magnetic material that is filled in the first through-hole; a third through-hole that is formed in the magnetic material; a first plating film that covers an inner wall surface of the third through-hole; and a second plating film that covers an inner wall surface of the second through-hole and the first plating film. The first plating film includes a first electroless plating film that is in contact with the inner wall surface of the third through-hole, and a first electrolytic plating film that is laminated on the first electroless plating film.

A printed wiring board according to an aspect of the present invention includes an insulating resin, a plated copper formed on a front surface side of the insulating resin, and a plated copper formed on a back surface side of the insulating resin. The plated copper and the plated copper are electrically connected via a plated copper that fills a through hole penetrating the insulating resin from the front surface side to the back surface side. Furthermore, the through hole includes a conical section whose opening diameter decreases from the front surface side to the back surface side of the insulating resin, and a cylindrical section that communicates with the conical section at a bottom surface of the conical section.

A printed circuit board (PCB) includes: a substrate; and a circuit pattern disposed on the substrate, wherein the circuit pattern includes a first seed layer disposed on the substrate and including a nitride, and a metal layer disposed on the first seed layer.