| 摘要 |
PURPOSE:To improve accuracy in a lens moving position and a reflection member moving position and to simplify an adjusting operation by providing a 1st stepping motor, a 2nd stepping motor, a 1st control means and a 2nd control means. CONSTITUTION:The device is provided with the 1st stepping motor M1 for moving and positioning a single focusing lens 15, the 2nd stepping motor M2 for moving and positioning reflection members 16 and 17, and the control means for respectively and independently actuating the 1st and the 2nd driving means M1 and M2 by arithmetically operating the moving quantity. Then, by prioritizing either of a focal point decided according to the position of the lens 15 and magnification decided according to the position of the reflection members 16 and 17 as for the fine error in a moving distance by the use of the stepping motors M1 and M2, still more accurate optical performance is obtained. Furthermore, in the case that the focal point is prioritized, the moving quantity of the reflection members 16 and 17 is arithmetically operated based on the 2nd magnification corresponding to the actual moving distance of the lens 15 obtained based on the 1st set magnification. Thus, the accuracy in the moving quantities of the lens and the reflection means at the time of changing the magnification is improved and the adjusting operation is simplified. |
