| 摘要 |
In this invention, ion generators (1) are disposed in a wind passage (7), at the front and in the back along the blowing direction. An ion sensor (33) is provided between the ion generator (1) located on the upstream side of the blowing direction and the ion generator (1) on the downstream side, and the ion sensor (33) is disposed so as to face both ion generators (1) across the wind passage (7). The two ion generators (1) operate alternately. Ions are detected according to the operation timing of the two ion generators (1). This configuration allows anomalies in a plurality of ion generators to be reliably detected by a small number of ion sensors. |
