LIGHT QUANTITY ADJUSTMENT DEVICE AND OPTICAL APPARATUS

摘要

The light-quantity control apparatus (10) includes a stop blade (3) including a stop portion (3a) and a supported portion (3b) rotatably supported with respect to a base member (1), a shutter blade (21, 22) having a shutter portion (21a, 22a) and a supported portion (21b, 22b) rotatably supported with respect to the base member, and a driving member (2) disposed between the shutter and stop blades and rotating around the light-passing aperture to rotate the stop blade. The stop and shutter blades have tilts in their supported portions toward a same one side in the optical axis direction so that the stop and shutter portions are distant from the supported portions in the optical axis direction. The driving member has a shape concave toward the one side from its outer circumferential side portion to its inner circumferential side portion. A concave space (S) facing the light-passing aperture is formed inside than the stop and shutter blades and the driving member.