A printed wiring board includes an insulator having a first surface, and a second surface opposite to the first surface, a through-hole penetrating from the first surface to the second surface, and a metal plated layer formed on the first and second surfaces of the insulator, and on an inner peripheral surface of the through-hole, wherein an inside diameter of the through-hole gradually decreases from the first surface toward the second surface of the insulator. An average diameter of the through-hole is 20 m or greater and 35 m or less at the first surface, and is 3 m or greater and 15 m or less at the second surface, and an average thickness of the metal plated layer formed on the first and second surfaces is 8 m or greater and 12 m or less.

An electronic device and a tiling electronic apparatus are disclosed and include a base substrate, a first circuit layer and a plurality of light-emitting elements. The base substrate has a first surface and a second surface opposite to each other. The first circuit layer includes a first portion and a second portion. The first portion is disposed on the first surface of the base substrate, and the second portion is disposed on the second surface of the base substrate. The light-emitting elements are disposed on the first portion of the first circuit layer. At least one of the second surface of the base substrate and the first portion of the first circuit layer includes at least one microstructure.

An example apparatus includes a cover to shield, at least partly, a conductive trace on a surface of a circuit board from electromagnetic interference. The cover includes a conductive surface that faces the conductive trace. The cover at least partly encloses a volume over the conductive trace. The volume is for holding air over the conductive trace. One or more contacts electrically connect the conductive surface of the cover to electrical ground on the circuit board.

A flexible printed circuit board includes a base film having an insulating property, and one or more interconnects laminated to at least one surface side of the base film. At least one of the one or more interconnects includes, in a longitudinal direction, a first portion and a second portion that is a portion other than the first portion, an average thickness of the second portion being greater than an average thickness of the first portion. A ratio of the average thickness of the second portion to the average thickness of the first portion is greater than or equal to 1.5 and less than or equal to 50.

An electronic device includes a substrate, a first conductive pad and a chip. The first conductive pad is disposed on the substrate. The chip includes a second conductive pad electrically connected to the first conductive pad, and the first conductive pad is disposed between the substrate and the second conductive pad. The first conductive pad has a first groove.

A printed wiring board includes an insulator having a first surface, and a second surface opposite to the first surface, and including a through-hole penetrating from the first surface to the second surface, and a metal plated layer formed on the first surface and the second surface of the insulator, and on an inner peripheral surface of the through-hole, wherein an inside diameter of the through-hole gradually decreases from the first surface toward the second surface of the insulator, an average diameter of the through-hole at the first surface of the insulator is 20 m or greater and 35 m or less, the average diameter of the through-hole at the second surface of the insulator is 3 m or greater and 15 m or less, and an average thickness of the metal plated layer formed on the first surface and the second surface of the insulator is 8 m or greater and 12 m or less.

A semiconductor device is to be mounted on a mount object by a solder. The semiconductor device includes a semiconductor element, an insulation member, and a plurality of terminals. The semiconductor element includes a plurality of electrodes. The insulation member covers the semiconductor element. The plurality of terminals is electrically connected to the plurality of electrodes. At least a part of the plurality of terminals is exposed outside the insulation member.

An apparatus includes a printed circuit board and a flexible printed circuit. A rigid structure component is on a first side of the printed circuit board. An interconnection interface is on a second side of the printed circuit board opposite to the rigid structure component and is configured to interconnect the flexible printed circuit and the printed circuit board. A conductive interconnection material is at the interconnection interface between the flexible printed circuit and the printed circuit board.

A substrate may be included in an electronic device. The substrate may include a first layer that may include a dielectric material. The first layer may define a substrate surface. The substrate may include a second layer optionally including the dielectric material. The second layer may be coupled to the first layer. A wiring trace may be located in the substrate. A recess may extend through the substrate surface, the first layer, and may extend through the second layer. A substrate interconnect may be located within the recess. The substrate interconnect may be at least partially located below the substrate surface. The substrate interconnect may be in electrical communication with the wiring trace.

A chip electronic component includes a stack, a first external electrode disposed at least on a first end surface and a first main surface of the stack, a second external electrode disposed at least on a second end surface and a first main surface of the stack, a first bump disposed at least on a portion of the first external electrode on the first main surface, and a second bump disposed at least on a portion of the second external electrode on the first main surface. The first bump and the second bump each have a porosity greater than or equal to about 5% and less than or equal to about 40%.