| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel in which a fixed barrel and a rotary barrel (cam barrel) are easily adjusted so that their center axes may be aligned with each other even if an error in molding accuracy is found in the fixed barrel and the rotary barrel.SOLUTION: Spacer rings 80 and 81 are formed in the shape of a short cylinder to be eccentric rings the center axes of outside diameters of which are deviated from the center axes of inside diameters thereof. The spacer rings 80 and 81 are press-fit and fixed in the fixed barrel 18, and rotational angles of the spacer rings 80 and 81 are adjusted, at this time, to eliminate the error in molding accuracy of the fixed barrel 18 and the cam barrel 19 and align the center axes of the fixed barrel 18 and the cam barrel 19 with each other. When an operation projection 21a is grasped to rotate a zoom ring 21, the cam barrel 19 rotates relative to the fixed barrel 18. Since the center axes of the fixed barrel 18 and the cam barrel 19 are aligned with each other within a rotation range of the cam barrel 19 associated with the zooming operation, optical characteristic of a projection lens 12 is kept excellent without causing positional deviation of respective lens groups. |
