Air purifier and production method for air purifier

An air purifier comprising:

• a first electrode-plate made of a conductive plate, the first electrode-plate comprising
• a first electrode portion that is plate-like, the first electrode portion comprising a plurality of first electrode-structures, each of the first electrode-structures having a first hollow that is substantially shaped as a circle, and second hollows that are substantially shaped as a circular ring that is concentric with the first hollow, and having a first conductive area substantially shaped as a circular ring between the first hollow and the second hollows,
• a second electrode portion that is plate-like, the second electrode portion comprising a plurality of second electrode-structures, each of the second electrode-structures having a third hollow that is substantially shaped as a circle and is larger in diameter than the first hollow, and fourth hollows that are substantially shaped as a circular ring that is concentric with the third hollow, and having a second conductive area substantially shaped as a circular ring between the third hollow and the fourth hollows, the second electrode-structures being formed at locations corresponding to respective locations of the first electrode-structures, and
• a coupling portion coupling the first electrode portion and the second electrode portion and having a bent shape to place the second electrode portion vertically above the first electrode portion such that each of the first electrode-structures and a corresponding one of the second electrode-structures are concentric;
• and
• a second electrode-plate made of a conductive plate, the second electrode-plate being located separate from the first electrode-structures and the second electrode-structures, a plurality of third electrode-structures being formed integrally in the second electrode-plate, each of the third electrode-structures extending along a central axis of a corresponding one of the first electrode-structures and a corresponding one of the second electrode-structures, toward the corresponding one of the first electrode-structures and the corresponding one of the second electrode-structures,
• wherein the first electrode-structures, the second electrode-structures, and the third electrode-structures are arranged in this order, and
• by application of a negative voltage to the first electrode-plate and a positive voltage to the second electrode-plate, corona discharges are caused between the first electrode-structures and the third electrode-structures and between the second electrode-structures and the third electrode-structures to generate an ionic wind that flows from the first electrode-structures and the second electrode-structures in a direction away from the third electrode-structures.