| 摘要 |
[Problem] To provide an ignition device with which it is possible to improve the air-fuel ratio in an internal combustion engine, without enlarging the size of the device or sharply increasing costs. [Solution] An ignition device comprising: a center conductor that has a surface through which electromagnetic waves propagate; a grounding conductor that surrounds the center conductor; a cylindrical second center conductor that is formed between the center conductor and the grounding conductor, and is connected to the center conductor at the rear end side thereof while insulated from the grounding conductor and separate from the center conductor at the tip end side thereof; and a projection-shaped discharge electrode part that is formed on the tip-end-side surface of the center conductor. The potential of the discharge electrode part is increased using an electromagnetic wave resonance structure formed using the center conductor and the second center conductor, thereby generating discharge between the discharge electrode part and the grounding conductor. |
