Patent ID: 8922324
Filing Date: 2014-12-30
Classification: H01F

Abstract:
1. An ignition coil for internal combustion engine, comprising: a center core disposed on an inner side of a primary coil and a secondary coil; and a side core disposed on an outer side of the primary coil and the secondary coil whose one end face abuts on one end face of the center core and the other end face abuts on the other end face of the center core via a magnet, wherein the side core is formed of a plurality of side core portions obtained by dividing laminated magnetic steel plates at different positions in a longitudinal direction thereof and has a superimposed portion in which the magnetic steel plates of the adjacent side core portions are mutually superimposed, but movable, between the different positions in the longitudinal direction, wherein the magnetic steel plates in the superimposed portion have an upper side and a lower side when viewed from a front view of the side core, the lower side being opposite the upper side, and wherein a width of the magnetic steel plates between the upper side and the lower side is smaller in superimposed portion than a width of the magnetic steel plate in other portions, such that the upper side and the lower side of the superimposed portion are inside the width magnetic steel plates in the other portions.