| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel which executes AF and MF with a simple configuration without mechanical switching operation.SOLUTION: The lens barrel includes: a driving source; a lead screw which is provided in parallel with an optical axis and is rotated by a rotational output of the driving source; first frame means; a guide shaft which guides the first frame means rectilinearly in parallel with the optical axis; a nut member which has a spur gear part on an outer peripheral surface thereof and has a screw engaged with the lead screw and can be moved in parallel with the optical axis along with the first frame means in accordance with rotation of the lead screw; second frame means having an internal gear which is engaged with the spur gear part of the nut member to be rotatable around the optical axis and, during rotation of the lead screw, stops rotation of the nut member and makes the nut member movable in an optical axis direction, and when being manually operated to rotate around the optical axis, rotates the nut member to move the nut member in the optical axis direction; and clutch means provided between the second frame means and the nut member. |
