| 摘要 |
PURPOSE:To shorten the distance from the optical axis of a lens up to the end part of a lens holder, by constituting a lens holder or lens mount so as to enclose partly the circumferential surface of a lens barrel. CONSTITUTION:A lens barrel 22 incorporated with a lens 21 is stuck to lens holders 23 and the holders 23 are so constituted as to sandwich the barrel 22 from both right and left sides. Each screw hole is provided to both holders respectively. A circular opening 26 smaller than the lens 21 is provided to a lens mount 25 as can be seen in the figure illustrating the mount 25 to which the holders 23 holding the barrel 22 are mounted. Screw holes 27 fitting to the screw holes 24 of the holders 23 are provided on the right and left of the opening. Bolts 28 are fitted into the holes 24, 27, and the holders 23 are mounted to the mount 25. Since the upper and lower parts of the lens barrel are not enclosed with the lens holders or the lens mount as mentioned above, the distances A', B' from the optical axis of the lens up to the lens holder parts are shorter as compared to conventional holders. |
