| 摘要 |
PURPOSE: To enable a main observer and a sub observer to simultaneously observe the same image by providing an objective lens common to two optical paths from the observed image and a prism means deciding the direction of one light beam out of the light beams from the objective lens to be perpendicular to the light beam going toward a 1st observation station. CONSTITUTION: This device is provided with the objective lens 12 common to at least two optical paths of the light beams from the observed image and the 1st prism means 22 deciding the direction of at least one light beam out of the light beams from the objective lens 12 to a direction perpendicular to another light beam going toward the 1st observation station again. Then, it is provided with 2nd prism means 36 and 38 deciding the direction of the light beam going in the perpendicular direction toward a 2nd observation station again and rotating around an optical axis so that the 2nd observation station may be kept in parallel with the image, and a means shortening or elongating the optical path of the perpendicular light beam when the 2nd prism means 36 and 38 are rotated. Thus, the main observer and the sub observer can simultaneously observe the same image. |
