| 摘要 |
A first needle-like electrode (2) is supported by a frame body (1), and has a first leading end portion (2a) that is positioned in a through hole (1a). A second needle-like electrode (3) is supported by the frame body (1), and is positioned on an extension line (A-A) in the direction in which the first needle-like electrode (2) extends, said second needle-like electrode having a second leading end portion (3a) that faces the first leading end portion (2a) in the through hole (1a) by being spaced apart from the first leading end portion. The first and second needle-like electrodes (2, 3) are configured such that the needle-like electrodes generate ions by generating electric discharge between the first and second needle-like electrodes (2, 3), and the first and second needle-like electrodes (2, 3) are disposed along the center line (A-A) of the through hole (1a). |
