| 摘要 |
<p>In a three-dimensional observation device, an observation can be made through a change in observation angle, and focusing does not have to be performed by moving an observation device upward and downward when the observation angle is changed. In a three-dimensional observation device (2), a rotating frame (6) is mounted on a fixed frame (3) that is mounted in a removable manner on a tip of an imaging device (1), an optical axis reflecting mirror (8) is mounted on the rotating frame (6), and a round reflecting mirror (9) that is opposed to the optical axis reflecting mirror (8) and rotates on a front surface side of the optical axis reflecting mirror (8) in an arc shape is mounted. When a point of intersection between the optical axis reflecting mirror (8) and the optical axis is point A, a point of intersection between the round reflecting mirror (8) and the optical axis is point B, and a point of intersection between a focal plane of a subject with the optical axis is point C, and the angle of the optical axis reflecting mirror (8) and the positional relationship of the movement of the round reflecting mirror (9) in an arc shape are set in such a manner that the distance between point A and point B is constant all the time and the sum (L1+L2) of the distance (L1) between point A and point B and the distance (L2) between point B and point C are constant all the time. In this manner, an optical path is made such that the focus on the subject does not deviate even when the angle of observation is varied, the entire imaging device does not have to be moved upward and downward for focusing, and the actual position can be used to freely set the angle of observation.</p> |
