Plasma igniter comprises plasma spark plug and shank shaped central electrode, where plasma igniter has ground electrode and isolating electrode for isolating central electrode

摘要

The plasma igniter comprises a plasma spark plug (10) and a shank shaped central electrode (110). The plasma igniter has a ground electrode (131) and an isolating electrode (120) for isolating the central electrode. A surface of the ground electrode is concave with a concave section (150) in such a manner that an area of the surface of the ground electrode is increased as compared with an area of a virtual surface of the ground electrode.