LIGHT AMOUNT ADJUSTMENT DEVICE AND OPTICAL APPARATUS

PROBLEM TO BE SOLVED: To provide a light amount adjustment device that maintains, without increasing the number of components, the function thereof even in a case when a light amount adjustment member is brought into contact with a lens group due to unexpected impact force applied to a camera when the camera is used.SOLUTION: The light amount adjustment device is provided with: the light amount adjustment member that uses a rotatable rotor magnet as a driving source and is retractable with respect to a light passage port along with the rotation of the rotor magnet; and a device substrate that supports a driving unit. A structure that restricts the light amount adjustment member from moving by a certain amount or greater in a direction orthogonal to a rotation direction for being retracted to the light passage port is provided at a place farther than the light passage port of a bottom board with respect to a rotational axis of the light amount adjustment member.SELECTED DRAWING: Figure 4 【課題】部品点数を増やすことなく、カメラ使用時に不測の衝撃力が加わって、光量調節部材にレンズ群が接触した場合においても、機能を失わない光量調節装置を提供する。【解決手段】回転可能なロータマグネットを駆動源とし、前記ロータマグネットの回転に応じて光通過口に対して進退可能な光量調節部材と、駆動ユニットを支持する装置基板と、を備え、前記光量調節部材が光通過口に進退する回転方向に直行する方向へ一定量以上の移動が規制する構造が、前記光量調節部材の回転軸に対して、地板の光通過口よりもさらに遠い場所に設けられていることを特徴とする光量調節装置。【選択図】図４