Patent ID: 8981635
Filing Date: 2015-03-17
Classification: H01T

Abstract:
1. A high-frequency plasma ignition plug comprising: an insulator having an axial bore extending in a direction of an axis; and an electrode inserted into the axial bore, wherein a plasma discharge is generated through supply, to the electrode, of high-frequency power generated by a predetermined high-frequency power supply, the electrode comprising: wherein in the axial bore, the terminal electrode and the center electrode are fixed to the insulator by means of a glass seal which contains a glass component, the glass seal is provided at least in a space defined by an outer circumferential surface of the connection extension, an inner circumferential surface of the axial bore, a forward end surface of the terminal electrode, and a rear end surface of the center electrode body; and a relational expression S3−S2≧1.2 is satisfied, where