| 摘要 |
PROBLEM TO BE SOLVED: To provide a plug tip manufacturable at a cost lower than a conventional optimum tip formed of one material and technically improved more than a rather inexpensive tip formed of a low quality material by improving an ignition device of a conventional type for igniting an air/fuel mixture in an internal combustion engine by a high-frequency electric energy source. SOLUTION: One end part 8 of a coaxial waveguide passage structure 5 is formed as an ignition pin 12. Accordingly, free plasma can be generated in the air/fuel mixture by a field structure projected into a combustion chamber in the state of being applied with a potential. The ignition pin 12 is at least partially formed of an outside partial pin 14 and an inside pin 13 symmetrically with respect to the rotating axis. In this case, the inside partial pin 13 is formed to have a conductivity higher than that of the outside partial pin 14. COPYRIGHT: (C)2005,JPO&NCIPI
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