| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic circuit for an ignition coil which improves a magnetic flux density by effectively utilizing a magnetization force of a permanent magnet without expanding a physical constitution, and an ignition coil device.SOLUTION: A closed magnetic circuit is formed from a central core 10 disposed inside of a primary coil 20, an outer peripheral core 13 disposed to surround the outside of a secondary coil 30, and a permanent magnet 12 having a larger sectional area than that of the central core 10. In an end portion of the central core 10, a flange 11 is provided which is expanded toward both side faces and forms a magnetic path to a front face where the permanent magnet 12 is exposed from the side faces of the central core 10. An electromagnetic material forming the flange 11 includes at least an easy magnetization vector in a direction matched with a magnetization vector from the side faces of the central core 10 to the permanent magnet 12. |
