| 摘要 |
PROBLEM TO BE SOLVED: To restrain oscillation of a transferrable lens when it is being driven.SOLUTION: A lens frame has a transferrable frame sliding along a guide shaft and a drive unit that has a screw, an electric motor, a nut and a pressurizing member and is so configured as to transfer the transferrable frame along the guide shaft. The nut has a projection extending outward in the diametric direction of a female thread; the transferrable frame has an engaging part that regulates rotations of the nut relative to the transferrable frame by holding the projection of the nut in the circumferential direction; and the projection and the engaging part are so configured, when viewed in a direction along the optical axis, as to pass a cross section of the guide shaft and come into contact with each other on a straight line orthogonal to the extending direction of the projection. |
