| 摘要 |
A center core 1, a secondary coil 3 wound at a secondary bobbin 2 and a primary coil 5 wound at a primary bobbin 4 are placed concentrically inside a coil case 6 in sequence from the inside of the coil case. One end of the secondary coil 3 is connected to the primary coil side and becomes a low-voltage side, and the other side becomes a high-voltage side due to an induced voltage and used with connection to the individual ignition plugs of the internal combustion engine. The radial thickness of the bobbin at the low-voltage side 3a and the high-voltage side 3c of the secondary coil, each located at the both ends of the secondary coil, is made larger than the radial thickness of the bobbin at the center part 3b of the secondary coil. The radial thickness of an insulating layer 8 between the secondary coil 3 and the primary coil 5 at the low-voltage side 3a of the secondary coil is smaller and the radial thickness of the insulating layer at the high-voltage side 3b of the secondary coil is larger.
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