Importance

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Abstract

An ignition coil for an internal combustion engine is mainly made up of a transformer part and a control circuit part and a connecting part, and the transformer part is made up of a iron core which forms an open magnetic path, magnets, a secondary spool, a secondary coil, a primary spool and a primary coil. By respectively setting the cross-sectional area S.sub.C of the iron core between 39 to 54 mm.sup.2, the ratio of the cross-sectional area S.sub.M of the magnets with the cross-sectional area S.sub.C of the iron core in the 0.7 to 1.4 range, the ratio of the axial direction length L.sub.C of the iron core with the winding width L of the primary and secondary coils in the 0.9 to 1.2 range, and the winding width L in the 50 to 90 mm range, the primary energy produced in the primary coil can be increased without increasing the external diameter A of the case.

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First Claim