| 摘要 |
<p>An optical scanner (1) includes a plurality of automatic cleaning units (7) which automatically cleans dust-proof glasses (5). The automatic cleaning units (7) include screw shafts (10) threadedly coupled to holding units (13) that hold cleaning members (14). When the holding members (13) are moved by rotationally driving the screw shafts (10) of the automatic cleaning units (7) at the same time, the height of the cleaning member (14) of at least one of the automatic cleaning units (7) with respect to the dust-proof glasses (5) becomes different from the height of the cleaning members (14) of the remaining automatic cleaning units (7) with respect to the dust-proof glasses (5).</p> |
