| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for adjusting the focus by moving an observation apparatus vertically every time when the observation angle is changed in a three-dimensional observation apparatus.SOLUTION: In a three-dimensional observation apparatus 2, a rotary frame 6 is attached to a fixed frame 3 which is attached removably to the tip of an image pickup device 1, an optical axis reflection mirror 8 is attached to the rotary frame 6, and an orbitary reflection mirror 9 rotating on the front side of the optical axis reflection mirror 8 while facing the optical axis reflection mirror 8 is attached. When the intersection of the optical axis reflection mirror 8 and the optical axis is point A, the intersection of the orbitary reflection mirror 9 and the optical axis is point B, and the intersection of the focal plane of a subject and the optical axis is point C, physical relationship of the optical axis reflection mirror 8 and the orbitary reflection mirror 9 is set so that the sum L1+L2 of the distance L1 between points A, B and the distance L2 between points B, C is always constant. Consequently, an optical path is formed so that the focus to the subject does not shift even if the observation angle changes, and the observation angle can be set arbitrarily without requiring vertical adjustment of the whole image pickup device for focusing. |
