Patent ID: 6028501
Filing Date: 2000-02-22
Classification: H01F

Abstract:
An ignition coil comprising a transformer having a primary coil, to which direct current voltage can be intermittently applied, and a secondary coil, in which electromotive force is induced by said voltage, said transformer disposed around an outer periphery of a cylindrical magnetic core and spaced apart axially from one end of said core, an outer cylinder surrounding an external surface of said transformer and axially extending substantially to an upper end at a plane passing through said one end;a toroidal permanent magnet having a center and having an outer diameter substantially equal to an inner diameter of said outer cylinder or substantially equal to an outer diameter of said outer cylinder, said toroidal magnet having an inside perimeter and an outside perimeter of opposite polarities, said inside perimeter abutting said outer periphery, of the magnetic core said toroidal magnet being adjacent to said plane and spaced apart axially from said transformer,a first magnetic field, generated by said toroidal magnet, opposed to a second magnetic field generated by said primary coil.