US Patent 7497898 Ionizer

Positive and negative electrode needles, an air-blowing outlet, and a protection cover for covering these electrode needles and the air-blowing outlet are attached to an electrode cartridge which is attached to a housing, and an air-blowing hole positioned in front of the air-blowing outlet in a concentric manner therewith, for blowing out air from the air-blowing outlet toward the outside, and two air-flowing-out holes positioned in a concentric manner with the respective positive and negative electrode needles, and respectively surrounding outer peripheries of respective tip end portions of respective electrode needles via respective gaps for flowing out the air are formed in the protection cover.