Fujikura Limited

Nobuki Ueta

Masakazu Sato

Masatoshi Inaba

Yoshio Nakao

A component-embedded substrate includes: a plurality of insulating layers each including a wiring pattern formed on one surface; an embedded component including a connection terminal; and a plurality of vias that electrically connect the connection terminal to the wiring patterns adjacent to each other in a lamination direction. The plurality of insulating layers is laminated on the connection terminal. Each of the plurality of vias is composed of a via hole formed in the respective insulating layer of the plurality of the insulating layers and a conductive material provided in the via hole. One of the plurality of vias is a connection via directly connected to the connection terminal. Another of the plurality of vias is a first adjacent via adjacent to the connection via in the lamination direction. The first adjacent via is connected to the wiring pattern formed on a surface of a top insulating layer.

Component-embedded substrate

A component-embedded substrate includes: insulating layers each including a wiring pattern; an embedded component including a connection terminal; a plurality of vias that electrically connect the connection terminal to the wiring patterns adjacent to each other in a lamination direction. Each of the vias is composed of a via hole in the insulating layer and a conductive material in the via hole. One of the vias is a connection via connected to the connection terminal, and another of the vias is an adjacent via adjacent to the connection via in the lamination direction. The connection via and adjacent via overlap in a plan view. S1/A1&#x2264;0.61 and S1/A2&#x2264;0.61 are satisfied, where A1 is an average cross-sectional area of the connection via, A2 is an average cross-sectional area of the adjacent via, and S1 is an overlapping area of the connection via and adjacent via in the plan view.

A multi-layer wiring board is configured having stacked therein, in a stacking direction, via an adhesive layer, a plurality of printed wiring bases in each of which a wiring pattern and a via are formed on/in a resin base. A multi-layer wiring board includes a movable portion configured from an elastic member and a void portion, the movable portion being formed in the printed wiring bases and adhesive layer in a periphery of a matrix-shaped plurality of multi-layer wiring portions disposed at a certain interval as viewed in a planar manner, and the movable portion joining the plurality of multi-layer wiring portions such that each of the multi-layer wiring portions is displaceable in the stacking direction and a direction of surfaces of the printed wiring bases.

Multi-layer wiring board and method of manufacturing the same

A component built-in board mounting body has a component built-in board mounted on a mounting board, the component built-in board being configured having stacked therein a plurality of printed wiring bases that each have a wiring pattern and a via formed on/in a resin base thereof, and having an electronic component built in thereto, wherein the component built-in board has at least a portion of the plurality of printed wiring bases including thermal wiring in the wiring pattern and including a thermal via in the via, and is mounted on the mounting board via a bump formed on a surface layer of the component built-in board, and a surface on an opposite side to an electrode formation surface of the built in electronic component is connected to the bump via the thermal via and the thermal wiring, and is thermally connected to the mounting board via the bump.

Growing community of inventors

Sakura, Japan

Nobuki Ueta