Ignition device of internal combustion engine and electrode structure of the ignition device

An ignition device for igniting a fuel-air mixture filling a combustion space of an internal combustion engine, comprising:

• a pulse power supply;
• an electrode structure;
• and
• a pulse voltage transmission path for connecting said pulse power supply and said electrode structure, wherein
• said electrode structure includes
• 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,
• the surface of said first electrode includes
• a first exposed surface exposed in the combustion space, and
• a first coated surface coated with said first dielectric barrier,
• a surface of said second electrode includes
• a second exposed surface exposed in said combustion space, and
• the surface of said auxiliary electrode includes
• a second coated surface coated with said second dielectric barrier,
• 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.

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;
• an auxiliary electrode made of a conductor;
• a first dielectric barrier that is made of a dielectric body and partially coats said first electrode;
• and
• a second dielectric barrier that is made of a dielectric body and entirely or partially coats said auxiliary electrode, wherein
• a surface of said first electrode includes
• an exposed surface exposed in said combustion space,
• a first coated surface coated with said first dielectric barrier, and
• the surface of said auxiliary electrode includes
• a second coated surface coated with said second dielectric barrier,
• said exposed surface is opposed to an inner wall surrounding said combustion space 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 exposed surface to said inner wall via said combustion space.

An ignition device for igniting a fuel-air mixture filling a combustion space of an internal combustion engine, comprising:

• a pulse power supply;
• an electrode structure;
• and
• a pulse voltage transmission path for connecting said pulse power supply and said electrode structure, wherein
• said electrode structure includes
• a first electrode that is made of a conductor and has a bar shape,
• an auxiliary electrode made of a conductor,
• a first dielectric barrier that is made of a dielectric body and partially coats a surface of the first electrode, and
• a second dielectric barrier that is made of a dielectric body and entirely or partially coats a surface of the auxiliary electrode,
• the surface of said first electrode includes
• an exposed surface exposed in said combustion space,
• a first coated surface coated with said first dielectric barrier, and
• the surface of said auxiliary electrode includes
• a second coated surface coated with said second dielectric barrier,
• said exposed surface is opposed to an inner wall surrounding said combustion space 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 exposed surface to said inner wall via said combustion space.