| 摘要 |
PURPOSE:To surely hold a plastic lens liable to thermally expand by using a holding member deformable elastically in the diametrical direction of the lens. CONSTITUTION:A lens 13 is inserted into a lens barrel 10, and by screwing a pressing ring 14 into the screw part 11, the lens 13 is fixed. A lens holding part 15 engaged with a recess cut in the periphery of the lens is formed with an elastic member deformable in the diametrical direction of the lens. Accordingly, even if the lens 13 is a lens liable to thermally expand such as a plastic lens, a strain due to stress is not produced in the lens 13 when the lens 13 is deformed, no gap is produced between the holding part 15 and the lens 13, and the lens 13 is kept in the surely fixed state. |
