| 摘要 |
PURPOSE:To accurately position reflecting bodies and, at the same time, to improve the packing density and to reduce the size of the reflecting bodies, by installing plural driving rods and flanges, a guide plate, driving means, and positioning member to a driving device. CONSTITUTION:A reflecting body 10 is set on a driving rod 2 constituting a driving device and a discoid flange 3 is provided at the lower end section 2b of the long driving rod 2. The driving rod 2 which is united with the flange 3 in a concentric state is put in a bearing 5 buried in the case 4 of a positioning mechanism 1 from its bottom and set to a condition where it can be moved freely in the vertical direction of the case 4 by means of the operating piece 6a of a driving means 6 which is coupled with the lower end section 2b of the driving rod 2 and composed of an electromagnetic coil, but its upward movement is limited by the flange 3. When the rod 2 is moved upward, the rod is supported at two points in the direction A and three points in the direction B and a pushing force is always applied to the rod 2 in a fixed direction. Therefore, the upper end section 2a of the driving rod 2 is projected at the same place at the same angle. |
