SPARK PLUG, AND COMPRESSION-IGNITION INTERNAL COMBUSTION ENGINE

摘要

[Problem] To prevent a reduction in the ignition properties of a spark plug due to carbon deposits. [Solution] This spark plug includes: a central electrode that transmits microwaves; a discharge electrode that is attached to the tip end portion of the central electrode; a ground electrode that is provided in an area around the central electrode and the discharge electrode at a distance therefrom; and an insulating body that insulates the central electrode and the ground electrode. The tip end of the insulating body is disposed more rearward than the rear end of the discharge electrode.