| 摘要 |
PURPOSE:To recognize wide and narrow fields with one image pickup unit by aligning in parallel wide and narrow field optical systems along the optical axis of the image pickup unit and providing a movable mirror between the both systems. CONSTITUTION:Wide and narrow field optical systems 12, 13 are aligned in parallel along the optical axis of an image pickup unit 11, and a movable mirror 16 is provided between the systems 12 and 13. When the mirror 16 is rotated at the position parallel to the optical axis x1, the reflected light from an object 10 propagtes linearly into the system 12 as it is, passes through a half mirror 17 to reach the unit 11, thereby observing the image in wide field. When the mirror 16 is rotated at 45 deg. to the optical axis x1, the image is observed in narrow field. |
