Patent ID: 6025770
Filing Date: 2000-02-15
Classification: H01F

Abstract:
An ignition coil comprising a transformer surrounding a cylindrical magnetic core, said transformer including a primary coil, to which a DC potential is applied in bursts and which generates a primary magnetic field, and a secondary coil, which retrieves reduced electromotive force, and an outer cylinder surrounding said transformer;a plurality of toroidal magnets, each with an inside perimeter and an outside perimeter having polarities opposite to each other, successive said toroidal magnets being nested inside one another and located adjacent at least one end of said transformer along an axis of said magnetic core, said toroidal magnets being between said magnetic core and said outer cylinder, whereby said toroidal magnets apply a counter magnetic field to said magnetic core and said outer cylinder, said counter magnetic field being opposite in direction to said primary magnetic field.