IGNITION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an ignition device which represents satisfactory ignitability and durability even in an internal combustion engine where a strong cylinder inside airflow occurs within a combustion chamber.SOLUTION: An ignition device comprises at least: a center electrode 100 in a long shaft shape; a bottomed and tubular center dielectric body 110 covering the center electrode 100; a substantially annular grounding electrode 120; and a high energy power source 2 which applies a predetermined high voltage between the center electrode 100 and the grounding electrode 120 and performs discharging inside of a substantially tubular discharging space 130 partitioned between the center dielectric body 110 and the grounding electrode 120. The ignition device 1 ignites an engine 5 by reacting a non-equilibrium plasma generated by discharging with a mixture existing within the discharging space 130. At least the grounding electrode 120 protrudes towards the inside of a combustion chamber 52 of the engine 5 with a predetermined grounding electrode protruding height H, and the center dielectric body 110 protrudes with a center dielectric body protruding height Hequal to or higher than the grounding electrode protruding height H.