| 摘要 |
The invention is directed to an ignition coil for an internal combustion engine which includes a housing having therein a first core, a second core which is received in the housing and magnetically connected to the first core for forming a magnetic path therewith, a bobbin having a cylindrical portion for receiving therein the second core with an end face thereof exposed to the outside of the cylindrical portion, a primary winding wound around the bobbin, a secondary winding wound around the primary winding in co-axial relationship therewith, and a permanent magnet which is disposed between the first core and the second core. The permanent magnet has a planar surface connected to the end face of the second core, and an extending end portion which extends out of the end face of the second core. The housing and the bobbin are arranged to enclose the extending end portion of the permanent magnet. Then, a synthetic resin is filled in the housing for fixing and insulating the first core, the second core, the primary winding, the secondary winding, and the permanent magnet. It may be so arranged that the housing has a stepped portion therein, and a recess is formed on the stepped portion for receiving the extending end portion of the permanent magnet, so as to shield the extending end portion. In addition, this extending end portion may be shielded by a wall portion formed on the bobbin.
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