| 摘要 |
PROBLEM TO BE SOLVED: To obtain a focusing mechanism by which an excellent focusing property at an autofocusing driving time is obtained by eliminating the occurrence of the backlash of a linked part between a rotating member and a focusing member in the focusing mechanism of a system to move a rotary body in an optical axis direction by rotating the focusing member held between a fixed member and the rotating member. SOLUTION: Since a focus cam barrel 8 is fitted so as to rotate within an angle range regulated by the outside diameter of a front ring 6, a focusing ring 7 on which screw-cutting work is done on an inside diameter side is rotated, and the focus cam barrel 8 is moved in the optical axis direction, so that focusing is performed. The focusing ring 7 is constituted by using an elastic member having an excellent sliding property, and possesses at least two or more projected parts 7a, and the projected parts 7a come into press-contact with the V-shaped groove part 8a of the top end of the focus cam barrel 8, and regulate the focus cam barrel 8 in the optical axis direction, and hold it in the state of being rotatable in an angle direction centering an optical axis. |
