Patent ID: 6781500
Filing Date: 2004-08-24
Classification: H01F

Abstract:
An ignition coil for an internal combustion engine comprising:a resin spool formed in a substantially cylindrical shape; a coil constituted by a coil winding wound around said spool; and a high electric voltage being supplied to an ignition apparatus in the internal combustion engine, wherein a plurality of projection portions protruding to an outer side in a diametrical direction from an outer peripheral surface of the spool are integrally formed in an end portion in an axial direction on the outer peripheral surface of said spool so as to line up in a circumferential direction, and a size (L) of a portion in said projection portion which is in parallel to an axial direction of said spool is larger than a size (T) of a portion in said projection portion which is in parallel to a direction orthogonal to the axial direction of said spool.