| 摘要 |
PROBLEM TO BE SOLVED: To reduce a manufacturing cost by making an optical box common to different kinds of devices. SOLUTION: Five or more fixing parts 14a to 14f are provided on the optical box 10, and only the first to the fourth fixing parts 14a to 14d are fastened to an optical bench 20 with screws. When a reflection mirror 5, etc., are resonated in the device of the kind that a rotational polygon mirror 3 is operated with the different number of revolution, for example, the mirror 5, etc., are prevented from resonating only by selecting the first, the second, the fifth, and the sixth fixing parts 14a, 14b, 14e, and 14f and fastening them to the bench 20 with screws, and the same optical box can be used. |
