A charging device or an electric dust collector has a downstream side grounded electrode plate 90 placed so as to obstruct the flow of a dust-containing air and having openings 91 for allowing the dust-containing air to pass therethrough, a supporting plate 60 placed on the upstream side of the electrode plate 90, and downstream side discharging electrodes 80b supported by the supporting plate 60 so as to extend from the supporting plate 60 towards the electrode plate 90, and placed so as to correspond to the openings 91. The tip parts of the discharging electrodes 80b penetrate the openings 91 and project to the downstream side of the electrode plate 90, and the tip part of each discharging electrode 80b and the edge part of each opening 91 are positioned so as to have a predetermined gap between them.

Apparatus (100) and method are disclosed for removing or reducing the number of particles in an enclosed atmosphere during intracorporeal procedures. The apparatus comprises a housing (180) adapted to be placed against the body on which a procedure is to be formed, a first electrode (140) external to the housing for contacting the body, an elongated electrically insulated probe (130) extending from the housing (180) and being insertable into an intracorporeal body cavity (C) in which a procedure is to be performed, a second electrode (150) at the free end of the probe, and circuit means (110) for generating voltage between said first and second electrodes. The method comprises applying a voltage between the electrodes sufficient to cause local ionization of particles within the body cavity such that they migrate away from the second electrode, thereby removing or reducing the number of particles generated during the procedure from the enclosed atmosphere at or around the site of the procedure.

Apparatus (100) and method are disclosed for removing or reducing the number of particles in an enclosed atmosphere during intracorporeal procedures. The apparatus comprises a housing (180) adapted to be placed against the body on which a procedure is to be formed, a first electrode (140) external to the housing for contacting the body, an elongated electrically insulated probe (130) extending from the housing (180) and being insertable into an intracorporeal body cavity (C) in which a procedure is to be performed, a second electrode (150) at the free end of the probe, and circuit means (110) for generating voltage between said first and second electrodes. The method comprises applying a voltage between the electrodes sufficient to cause local ionization of particles within the body cavity such that they migrate away from the second electrode, thereby removing or reducing the number of particles generated during the procedure from the enclosed atmosphere at or around the site of the procedure.

An electrostatic precipitator for an air purifier includes a first spiral strip having a continuous conductive electrode, a second spiral strip having a continuous conductive electrode and nested with the first strip, a plurality of combs. Each comb extends from an outer periphery of the precipitator to an intermediate region between the outer periphery and a center of the precipitator.

An electrostatic precipitator for an air purifier includes a first spiral strip having a continuous conductive electrode, a second spiral strip having a continuous conductive electrode and nested with the first strip, a plurality of combs. Each comb extends from an outer periphery of the precipitator to an intermediate region between the outer periphery and a center of the precipitator.

Provided are an apparatus and a system for classifying particles. The apparatus for classifying particles includes: an internal electrode which has a column shape; an external electrode which is spaced apart from the internal electrode and disposed to surround the internal electrode, and generates an electric field through an interaction with the internal electrode; and an aerosol supply unit which supplies aerosol particles to a separation space between the internal electrode and the external electrode, in which the separation space, through which the aerosol particles are introduced into the particle classifying apparatus and flow, is formed to be narrowed toward a lower aerosol flow side from an upper aerosol flow side into which the aerosol particles are introduced.

Provided are an apparatus and a system for classifying particles. The apparatus for classifying particles includes: an internal electrode which has a column shape; an external electrode which is spaced apart from the internal electrode and disposed to surround the internal electrode, and generates an electric field through an interaction with the internal electrode; and an aerosol supply unit which supplies aerosol particles to a separation space between the internal electrode and the external electrode, in which the separation space, through which the aerosol particles are introduced into the particle classifying apparatus and flow, is formed to be narrowed toward a lower aerosol flow side from an upper aerosol flow side into which the aerosol particles are introduced.

To provide an electric precipitator which can collect more reliably dusty foreign matter emitted during material processing such as stamping process utilizing an electrostatic force, has excellent installability, and can be used safely. Provided is an electric precipitator that collects dusty foreign matter by an electrostatic force, including: a laminated sheet at least including a dust collection layer that holds the dusty foreign matter in contact, a first electrode layer, a second electrode layer, and an insulation layer, the dust collection layer, the first electrode layer, the second electrode layer, and the insulation layer being laminated; and a power supply device that applies voltages across the first and second electrode layers. The insulation layer at least has a first insulation layer that insulates the dust collection layer and the first electrode layer, a second insulation layer that insulates the first electrode layer and the second electrode layer, and a third insulation layer that insulates the second electrode layer and a portion under the second electrode layer. Films having a surface resistivity of 10.sup.4 to 10.sup.8 are used for the first and second electrode layers.

An air freshener is disclosed. The air freshener includes a body case defining the air freshener, the body case having a filter installation opening formed in one side thereof, a filter housing disposed in the body case, the filter housing having a power terminal disposed therein, a drawer configured to be withdrawn from the inner space of the filter housing through the filter installation opening, and an electric dust collector separably located in the drawer, the electric dust collector having a power-receiving terminal disposed therein, wherein the power terminal contacts the power-receiving terminal in the state in which the drawer is settled in the inner space of the filter housing.

An air freshener is disclosed. The air freshener includes a body case defining the air freshener, the body case having a filter installation opening formed in one side thereof, a filter housing disposed in the body case, the filter housing having a power terminal disposed therein, a drawer configured to be withdrawn from the inner space of the filter housing through the filter installation opening, and an electric dust collector separably located in the drawer, the electric dust collector having a power-receiving terminal disposed therein, wherein the power terminal contacts the power-receiving terminal in the state in which the drawer is settled in the inner space of the filter housing.