Patent ID: 6639498
Filing Date: 2003-10-28
Classification: H01F

Abstract:
An individual ignition type ignition coil which is to be connected directly to a respective ignition plug of an internal combustion engine for use in the internal combustion engine comprising:a center core, a primary coil and a secondary coil installed concentrically in an interior portion of a coil case; insulation resin filled up among the center core, the primary coil and the secondary coil; and a bobbin on which at least said secondary coil is wound; wherein said bobbin is made of a thermoplastic resin member containing a suitable amount of a filler; wherein said filler projects from a surface of said bobbin in an amount which, at its maximum, is more than 10 microns; and wherein the insulation resin permeates clearance of the secondary coil so that said insulation resin is closely adhered to the filler projecting from the surface of said bobbin.