Patent ID: 7834732

Claim:
An ignition coil, comprising: an inner magnet core which is concentrically enclosed by a primary coil having a primary bobbin and a secondary coil having a secondary bobbin, the inner magnet core formed of sheet-metal strips stacked on top of each other, the sheet-metal strips overall forming one of (a) a substantially rectangular and (b) a substantially square cross-section surface of the inner magnet core, and at least an lower and an upper sheet-metal strip, delimiting the inner magnet core, having, at least in partial areas, a reduced width compared to other sheet-metal strips of the inner magnet core viewed in a longitudinal direction of the other sheet-metal strips; wherein at least the lower and the upper sheet-metal strips, at least in corner areas within the primary bobbin and the secondary bobbin which enclose the inner magnet core, have such a reduced width that the respective upper and lower sheet-metal strips reach into the corner areas of the inner magnet core.