Ionized air flow discharge type non-dusting ionizer

An ionized gas current emission type dust-free ionizer which comprises a chamber having an ionization part that ionizes a portion of an ion carrier gas that is supplied to the interior of this chamber, and a blowing part that feeds the ion carrier gas toward a charged body, and in which said ionization part is constructed from an ionization source that is contained in said chamber, and a control device which is disposed outside said chamber and which controls the quantity of ions generated by said ionization source via a high-voltage cable, this ionizer being characterized in that:

• said ionization source is either the generating part of a soft X-ray generating device, the generating part of a low-energy electron beam generating device, or the generating part of an ultraviolet radiation generating device;
• said chamber is formed in the shape of a cone or pyramid in which the cross-sectional area on the downstream side is greater than the cross-sectional area on the upstream side, a cylindrical or prismatic blowing part is disposed on the downstream side of said chamber, said ionization source is disposed in the vicinity of the inlet part of said blowing part;
• a shielding part which is used to block the soft X-rays or low-energy electron beam generated by said ionization source is formed in the vicinity of the tip end portion of said blowing part;
• and
• a laminar flow forming filter made of HEPA filler or ULPA filter is disposed on the upstream side of said ionization source;
• and
• said shielding part is constructed from a plurality of shielding members each having an opening for allowing ions to pass through it when the ions are generated by said ionization source, wherein the plurality of shielding members are arranged in the flow direction of the ions such that the openings of each mutually-adjoining shielding member pair do not overlap.