A printed wiring board of the present invention includes an insulating substrate layer; a first conductive layer laminated to one surface of the substrate layer; a second conductive layer laminated to another surface of the substrate layer; and a via hole formed along an inner surface of a connection hole that is provided, in a thickness direction, through the substrate layer and the first conductive layer, the via hole electrically coupling the first conductive layer and the second conductive layer. A cross-sectional shape of the connection hole along at least one surface of the substrate layer is an irregular shape.

A circuit board includes a substrate and at least two through holes defined in the substrate. The substrate includes a first conductive circuit layer and a second conductive circuit layer. The first conductive circuit layer and the second conductive circuit layer are respectively formed on opposite surfaces of the substrate. A number of conductive strips are formed on an inner wall of each of the at least two through holes. The number of conductive strips on the inner wall of a first one of the at least two through holes faces the number of conductive strips on the inner wall of a second one of the at least one through hole.

A multilayer ceramic substrate includes: a plurality of ceramic layers 300a, 300b stacked together; a via hole 400a, 400b provided in each of the plurality of ceramic layers, the via holes of the plurality of ceramic layers being connected together in a layer stacking direction of the plurality of ceramic layers; a via wire 406a, 406b including an electrical conductor filled into each of the via holes; a first conductor 404a, 404b provided on an upper surface of at least one of the plurality of ceramic layers, the first conductor having an annular or partially annular shape surrounding the via wire; and a second conductor 403a, 403b including a first portion and a second portion, the first portion being located outside the first conductor on the upper surface of the at least one ceramic layer, the second portion overlying the first conductor, and an inner rim of the second portion being located outside an inner rim of the first conductor, wherein a thickness of the first conductor 404a, 404b is greater than a thickness of the second conductor 403a, 403b.

A flexible printed circuit board includes a base film having an insulating property and a conductive pattern laminated on one surface of the base film, and has a terminal connecting area toward one end edge of the conductive pattern, the flexible printed circuit board including a reinforcement member laminated on an opposite surface of the base film and situated at least at a position opposite the terminal connecting area, wherein the reinforcement member has one or more lines of hollow holes aligning with a width direction thereof.

A method of manufacturing a circuit board having a heat dissipation block includes forming an opening through a substrate to form an open substrate. The opening has a first sidewall and a second sidewall opposite to each other, and the open substrate includes a substrate body surrounding the opening, at least one first fixing portion extending from the substrate body toward the opening and protruding from the first sidewall, and at least one second fixing portion extending from the substrate body toward the opening and protruding from the second sidewall. The heat dissipation block is then clamped between the first fixing portion and second fixing portion to fix the heat dissipation block in the opening.

A component carrier includes a layer stack formed of an electrically insulating structure and an electrically conductive structure. Furthermore, a bore extends into the layer stack and has a first bore section with a first diameter (D1) and a connected second bore section with a second diameter (D2) differing from the first diameter (D1). A thermally conductive material fills substantially the entire bore. The bore is in particular formed by laser drilling.

An electronic assembly that includes a substrate having an aperture which extends through the substrate. The electronic assembly further includes a gull wing electronic package that includes leads which are solder mounted to the substrate such that the gull wing electronic package is within the aperture in the substrate, wherein the aperture is concentric with an exterior of the gull wing electronic package.

A soldering fastening element, a structure thereof and a method for soldering the soldering fastening element to a circuit board are introduced. The soldering fastening element is soldered to a first circuit board so as for a second board to be coupled thereto. The soldering fastening element includes a body soldered to the first circuit board, a head for fastening the second board in place, and a neck which connects the body and the head. When in use, the soldering fastening element is contained in a carrier, taken out of the carrier with an automated tool, transferred to the first circuit board, and heated through a solder layer on the first circuit board such that the body gets soldered to the first circuit board to form a module member. Therefore, the second board gets coupled to the first circuit board through the head and neck.

A coupled via structure includes a plate via penetrating through an board body and having first and second plates spaced apart from each other by a first gap distance, a contact pad connected to the plate via on a surface of the board body and having first and second contacts connected to the first and second plates, respectively, and a connection line connected to the contact pad on the surface of the board body and having first and second lines connected to the first and second contacts, respectively, and spaced apart from the first line by a second gap distance. Accordingly, the deviation of the characteristic impedance is reduced (or, alternatively, minimized) between the coupled via structure and the coupled signal line.

According to various embodiments described herein, an article comprises a glass or glass-ceramic substrate having a first major surface and a second major surface opposite the first major surface, and a via extending through the substrate from the first major surface to the second major surface over an axial length in an axial direction. The article further comprises a helium hermetic adhesion layer disposed on the interior surface; and a metal connector disposed within the via, wherein the metal connector is adhered to the helium hermetic adhesion layer. The metal connector coats the interior surface of the via along the axial length of the via to define a first cavity from the first major surface to a first cavity length, the metal connector comprising a coating thickness of less than 12 m at the first major surface. Additionally, the metal connector coats the interior surface of the via along the axial length of the via to define a second cavity from the second major surface to a second cavity length, the metal connector comprising a coating thickness of less than 12 m at the second major surface and fully fills the via between the first cavity and the second cavity.