IGNITION PLUG AND PLASMA GENERATION DEVICE

摘要

To provide an ignition plug having low power loss even though iron is a main component of a center electrode thereof, to which a high frequency power such as a microwave is electrically supplied. A low impedance layer 6 composed of a material having magnetic permeability lower than iron is provided between an outer peripheral surface of a center electrode 2 and an inner peripheral surface of an axial hole 30 of an insulator 3. The low impedance layer 6 is in contact with at least the outer peripheral surface (surface) of the center electrode 2, thereby reducing power loss of an electromagnetic wave flowing on the surface of the center electrode 2. More particularly, the low impedance layer 6 is made of silver, copper, gold, aluminum, tungsten, molybdenum, titanium, zirconium, niobium, tantalum, bismuth, palladium, lead, tin, an alloy composed mainly of these metals, or a composite material of these metals.

主权项

1. An ignition plug, comprising:
a center electrode; an insulator formed with an axial hole, which the center electrode is fitted into; a main metal fitting arranged in a manner so as to surround the insulator; and a ground electrode adapted to form a discharge gap for spark discharge with the center electrode, wherein the center electrode is electrically supplied with a pulse voltage for spark discharge and an electromagnetic wave provided as energy to spark discharge, and a low impedance layer made of a material having magnetic permeability lower than iron is provided between an outer peripheral surface of the center electrode and an inner peripheral surface of the axial hole of the insulator.