| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical device that can set a mirror on a pedestal with prescribed accuracy. SOLUTION: The mirror 70 is rectangular when it is seen in a side-view, and its lower surface 70A abuts on a reference surface 74 and its upper surface 70B is pressed by a leaf spring 82, thereby, the mirror 70 is pressed and fixed on the surface 74. As a result, its reflection surface 70C formed perpendicularly to the surface 70A is fixed at a prescribed tilt angle. Meanwhile, the side surface 70D of the mirror 70 is pressed by a leaf spring 84, whereby the angle part 86 of the mirror 70 is pressed to a rib 76 and the mirror 70 is positioned. Since the mirror 70 is pressed to the surface 74, in such a case, there is no possibility that the surface 70C is tilted along the abutting surface 76A of the rib 76 even though the surface 76A is tilted, and the mirror 70 is accurately fixed. Since the mirror 70 is pressed to the surface 74 and stably held, the surface 70C of the mirror 70 is not tilted by vibration. |
