| 摘要 |
<p>PROBLEM TO BE SOLVED: To cause a stable drive of a plurality of light amount adjustment blades, and to enable a formation of an excellent shape of a light passing opening.SOLUTION: A light amount adjustment device comprises: a base member 1 that has an opening part 1a serving as an optical path provided; and a plurality of light amount adjustment blades provided rotatably from a periphery of the opening part 1a of the base member 1 toward an inward of the opening part thereof and adjusting an amount of light passing through the opening part 1a. When the plurality of light amount adjustment blades 4 are positioned at the periphery of the opening part 1a, the plurality of light amount adjustment blades advances at a plurality of portions including a blade tip part 4e from an overlapped state in an optical axis direction toward the inward of the opening part, and thereby the plurality of light amount adjustment blades 4 enables the opening part 1a to be stopped down in a state where the tip part 4e is prevented from warping toward the optical axis direction.</p> |
