| 摘要 |
A lens barrel includes a fixed cylinder, a first rotating cylinder, a linear movement cylinder which moves integrally in an axis direction with the first rotating cylinder, and a second rotating cylinder. The linear movement cylinder has equal to or more than three projections in an outer circumferential surface. The first rotating cylinder has equal to or more than three cutouts corresponding to each projection of the linear movement cylinder in an inner circumferential surface, and each cutout has a shape corresponding to a shape of each projection. Each cutout is formed in parallel with an axis of the first rotating cylinder, and in which each projections of the linear movement cylinder is inserted. An end of each cutout extends to a groove in a circumferential direction, each projection is guided in the groove, and the first rotating cylinder and the linear movement cylinder is connected. The linear movement cylinder has a through-hole corresponding to a pin provided in the second rotating cylinder, and at least two of the equal to or more than three projections are provided in an area in a circumferential wall of the linear movement cylinder where the through-hole is not formed in the circumferential direction. |
