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1. (WO2018105292) SPARK PLUG

Pub. No.:    WO/2018/105292    International Application No.:    PCT/JP2017/040226
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Thu Nov 09 00:59:59 CET 2017
IPC: H01T 13/39
H01T 13/20
Applicants: NGK SPARK PLUG CO., LTD.
Inventors: KUROSAWA Kazuhiro
黒澤 和浩
高岡 勝哉
TANAKA Kuniharu
田中 邦治
KURONO Hirokazu
黒野 啓一
UEGAKI Hironori
上垣 裕則
横山 広大
In order to provide a spark plug capable of suppressing radio-wave noise, an insulating body has a shaft hole extending in the axial direction, from the tip side to the rear end side thereof. At least part of a center electrode is inserted into the tip side of the shaft hole and at least part of a terminal fitting is inserted into the rear end side of the shaft hole. A connection section: connects the terminal fitting and the center electrode, inside the shaft hole; includes a plurality of magnetic particles comprising both ferrite particles and a conductive substance coating the particles; and has a conductive layer section that the conductive substance for any two magnetic particles among the plurality of magnetic particles comes in contact with. The conductive layer section has a straight line distance from end to end of at least 100 µm and a thickness of at least 2 µm.