Fdk Corporation

Toshimasa Sugihara

Makoto Okamoto

Yohei Fujii

Masayoshi Kimura

An electronic module is provided with a circuit board including a central-axis insertion hole and composed by laminating a multitude of wiring layers; and a core formed of a magnetic material and inserted through the central-axis insertion hole, wherein the circuit board includes a plurality of coil wiring patterns formed in positions of the respective wiring layers surrounding the core insertion hole; and edge-face through-holes formed on inner wall surfaces of the central-axis core insertion hole to electrically connect the plurality of coil wiring patterns to form a coil, the central-axis insertion hole has a octagon shape in plan view, concave portions are disposed on the inner wall surfaces corresponding to sides of the octagon shape, and the edge-face through-holes are formed in the concave portions.

Growing community of inventors

Tokyo, Japan

Toshimasa Sugihara