| 摘要 |
An ignition system of the current interruption type for internal combustion engine wherein a three-pole magneto having a magnet positioned in a recess formed at a magnetic rotor is used as a power supply for the ignition system and a transistor switch circuit is used for interrupting a primary current of an ignition coil device is disclosed which is capable of significantly increasing an advance angle width. Pole arc angles alpha of a pair of stator magnetic poles are set to be equal to each other and an angular interval alpha between stator magnetic poles is set to be equal to or less than an angular interval beta between rotor magnetic poles adjacent to each other. Also, an angular interval delta between the outer ends of the stator magnetic poles is set to be larger than an angular interval epsilon between the first rotor magnetic pole and the third rotor magnetic pole. Such construction permits a magnetic flux flowing in a core of the ignition coil device to be strained to increase the advance angle width.
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