Ignition device

An ignition device for use in an internal combustion engine comprising:

• a coil unit with a primary coil, a secondary coil, and an iron core, said primary coil including a main primary coil and an auxiliary primary coil formed by winding a single primary conductor on a primary bobbin, said secondary coil being formed by winding a secondary conductor on a secondary bobbin, said iron core electromagnetically coupling said primary coil and said secondary coil, said coil unit receiving a DC voltage from a power supply at an intermediate section of said primary conductor between said main primary coil and said auxiliary primary coil;
• a first switch interposed between said main primary coil and the ground and usable for switching between passage and interruption of a primary current flowing from said power supply into said main primary coil;
• a second switch interposed between said auxiliary primary coil and the ground and usable for switching between passage and interruption of a primary current flowing from said power supply into said auxiliary primary coil;
• and
• a controller that controls said first switch and said second switch,
• said primary bobbin including:
• a bobbin body extending in a tubular shape around a part of said iron core;
• and
• a hooking part protruding from a part of said bobbin body,
• said main primary coil and said auxiliary primary coil being wound on an outer peripheral surface of said bobbin body to be pointed to the same direction in a peripheral direction, and one of said main primary coil and said auxiliary primary coil being stacked on the other of said main primary coil and said auxiliary primary coil to be external to the other primary coil in a radial direction,
• at least a part of said intermediate section being hooked on said hooking part.