| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that since an opening through which a laser beam passes is temporarily released in the case of cleaning or exchanging a dust-resistant window for putting an optical housing 90 of an optical scanning device in a closed state, there is a fear that dusts may enter the inside. <P>SOLUTION: This optical scanning device is configured such that an opening 90a is doubly dust-resisted by a fixed dust-resistant window 67 and a movable dust-resistant window 71, and that the movable dust-resistant window 71 is attachable and detachable. <P>COPYRIGHT: (C)2012,JPO&INPIT |
