Global Patent Index - EP 2869413 A1

EP 2869413 A1 20150506 - Method of manufacturing spark plug

Title (en)

Method of manufacturing spark plug

Title (de)

Verfahren zur Herstellung einer Zündkerze

Title (fr)

Procédé de fabrication d'une bougie d'allumage

Publication

EP 2869413 A1 20150506 (EN)

Application

EP 14189873 A 20141022

Priority

JP 2013228834 A 20131101

Abstract (en)

To improve the accuracy of a judgment as to whether or not a discharge penetrating an insulator has occurred. A spark plug which includes a center electrode extending in an axial direction, an insulator having an axial hole which extends in the axial direction and in which the center electrode is disposed, a metallic shell disposed around the insulator, and a ground electrode electrically connected to the metallic shell and forming a gap in cooperation with the center electrode is manufactured by the following method. An assembly is formed by combining the metallic shell, the insulator, and the center electrode. A voltage is applied between the metallic shell and the center electrode of the assembly. In a period during which the voltage is applied, a judgment as to whether or not a discharge penetrating the insulator has occurred is made by using an output value output from an optical sensor directed toward a forward end portion of the assembly.

IPC 8 full level

H01T 13/60 (2011.01); H01T 21/02 (2006.01)

CPC (source: EP)

H01T 13/60 (2013.01); H01T 21/02 (2013.01)

Citation (applicant)

JP 2012185963 A 20120927 - NGK SPARK PLUG CO

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2869413 A1 20150506; EP 2869413 B1 20191204; JP 2015088436 A 20150507; JP 5921516 B2 20160524

DOCDB simple family (application)

EP 14189873 A 20141022; JP 2013228834 A 20131101