| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to perform imaging of an imager at all times and to correct a focusing position of the imager by simple and inexpensive configuration without the loss of quantity of light during photographing. SOLUTION: The imager 3 is arranged behind an objective lens group 1 and a retreatable quick return half mirror 2 is arranged between the objective lens group 1 and the imager 3 as an optical path splitting means toward a viewing optical system. Plane glass 9 for correcting the change in the image formation position in the optical axis direction accompanying the retreat of the quick return half mirror 2 cooperatively with the retreat from the optical axis of the imaging optical system of the quick return half mirror 2 is inserted into the optical axis of the imaging optical system. The quick return half mirror 2 and the plane glass 9 are respectively held at both ends of a mirror guide lever 8 which is rigid single member and their respective retreat and insertion are performed. The quick return half mirror 2 may be provided with a sloping plane for correcting the deviation in the image formation position in the direction intersecting with the optical axis. COPYRIGHT: (C)2004,JPO&NCIPI |
