公开(公告)号：US20180313317A1

公开(公告)日：2018-11-01

申请号：US15772303

申请日：2016-10-26

Applicant: IMAGINEERING, INC.

Inventor： Yuji IKEDA ,  Seiji KANBARA ,  Atsushi NISHIYAMA ,  Keisuke TAKEMOTO ,  Shoushi WATANABE

IPC: F02P3/01 ,  F02P23/04 ,  F02P13/00 ,  H01T13/20 ,  H01T13/50

CPC classification number: F02P3/01 ,  F02P23/045 ,  H01T13/22 ,  H01T13/467 ,  H01T13/50 ,  H01T13/52 ,  H05H1/46 ,  H05H1/52 ,  H05H2001/4607

Abstract: An erosion of an electrode is prevented in a spark plug that performs an ignition by use of a spark discharge and an electromagnetic wave. The spark plug that a pulse voltage for a spark discharge and an electromagnetic wave supplied into the spark discharge as an energy are applied to a center electrode, the spark plug comprises the center electrode, an insulator including an axis hole into which the center electrode is engaged, a ground electrode configured to form a space between the ground electrode and the center electrode in which the spark discharge is generated, and a cylindrical conductor that is arranged at an outer circumference of the insulator, and an annular member is formed at an inner circumference of the cylindrical conductor and at a position where a distance from a distal end surface of the cylindrical conductor is within a range between ⅛ wavelength and ¼ wavelength of the electromagnetic wave.