Abstract: In an individual ignition type ignition coil for use in an internal combustion engine in which a center core 1, a secondary coil 3 wound on a secondary bobbin 2 and a secondary coil 5 wound on a primary bobbin 4 are installed concentrically from an inner side of a coil case 6 in order. Among these interior constituting members, insulation resins 17 and 8 are filled up. Each of the primary bobbin 4 and the secondary bobbin 2 is made of a synthetic resin and at least a skin layer on an inner surface of the primary bobbin 4 and a skin layer on an outer surface of the secondary bobbin 2 are removed, and to the surfaces of the bobbins, the insulation resin 8 is adhered closely. By heightening a close adhesion strength (a bonding strength) of a bobbin and an insulation resin in an individual ignition type ignition coil, an anti-heat shock is improved and an insulation performance of the coil is attained.

Abstract: In an individual ignition type ignition coil for use in an internal combustion engine in which a center core 1, a secondary coil 3 wound on a secondary bobbin 2 and a secondary coil 5 wound on a primary bobbin 4 are installed concentrically from an inner side of a coil case 6 in order. Among these interior constituting members, insulation resins 17 and 8 are filled up. Each of the primary bobbin 4 and the secondary bobbin 2 is made of a synthetic resin and at least a skin layer on an inner surface of the primary bobbin 4 and a skin layer on an outer surface of the secondary bobbin 2 are removed, and to the surfaces of the bobbins, the insulation resin 8 is adhered closely. By heightening a close adhesion strength (a bonding strength) of a bobbin and an insulation resin in an individual ignition type ignition coil, an anti-heat shock is improved and an insulation performance of the coil is attained.