Amount-of-light adjusting device

摘要

To reduce the size of an optical apparatus having an amount-of-light adjusting device, there is provided an arrangement which comprises a light-blocking member arranged to move to vary a light-blocking area and a drive part for driving the light block member. The drive part includes a stator formed by a first stator piece having a first stator pole and a second stator piece having a second stator pole and a rotor made eccentric with respect to a central position of the first stator piece and the second stator piece. The drive part is disposed rearward of the light-blocking member in the direction of the optical axis.