| 摘要 |
<p>A spark plug (1) includes an insulator (2) having an axial hole (4) extending in the direction of the axis (CL1) and an electrode (8) provided in an inserted state inside the axial hole (4), and causes a plasma discharge by the supply, to the electrode (8), of high-frequency electric power generated by a predetermined high-frequency power source. The electrode (8) includes a center electrode (5) provided in an inserted state in the axial hole (4) on the front end side thereof, and a terminal electrode (6) provided in an inserted state in the axial hole (4) on the rear end side thereof. Inside the axial hole (4), the terminal electrode (6) and the center electrode (5) are fixed to the insulator (2) by a glass seal (7) containing a glass component, and the center electrode (5) and the terminal electrode (6) are in direct contact with one another. Thus, it is possible to further improve ignition characteristics.</p> |
