| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic module which can inhibit the occurrence of a short circuit between a core and end face through holes.SOLUTION: An electronic module comprises: a circuit board 4 in which a central axis insertion hole 26 is formed and multiple wiring layers are laminated; and a core which is formed by a magnetic material and inserted in the central axis insertion hole 26. The circuit board 4 includes: a plurality of coil wiring patterns formed at positions in respective wiring layers around the central axis insertion hole 26; and end face through holes 78 which are formed on an internal surface of the central axis insertion hole 26 and electrically connecting the plurality of coil wiring patterns to form a coil. The central axis insertion hole 26 has an octagon shape in plan view and has recesses 77 on the internal surface at portions corresponding to sides of the octagon shape, and the end face through holes 78 are formed in the recesses 77.SELECTED DRAWING: Figure 10 |
