Patent ID: 8261711
Filing Date: 2012-09-11
Classification: H01T

Abstract:
1. An electrode structure of an ignition device for igniting a fuel-air mixture filling a combustion space of an internal combustion engine, comprising: a first electrode that is made of a conductor and has a bar shape; a second electrode made of a conductor; an auxiliary electrode made of a conductor; a first dielectric barrier that is made of a dielectric body and partially coats a surface of said first electrode; and a second dielectric barrier that is made of a dielectric body and entirely or partially coats a surface of said auxiliary electrode, wherein the surface of said first electrode includes a surface of said second electrode includes the surface of said auxiliary electrode includes said first exposed surface is opposed to said second exposed surface with said combustion space therebetween, said first coated surface is opposed to said second coated surface with said first dielectric barrier, said combustion space, and said second dielectric barrier therebetween, and a first distance from said first coated surface to said second coated surface via said first dielectric barrier, said combustion space, and said second dielectric barrier is shorter than a second distance from said first exposed surface to said second exposed surface via said combustion space.