Light-quantity control apparatus and optical apparatus

A light-quantity control apparatus comprising:

• a light-quantity control blade movable along a curved path preformed between a convex lens surface of a first optical member and a concave lens surface of a second optical member;
• and
• a blade driver configured to rotate the light-quantity control blade along the curved path,
• wherein the blade driver includes:
• a rotating member configured to rotate the light-quantity control blade;
• and
• a driver connected to an outer circumferential edge portion of the rotating member.

A light-quantity control apparatus provided with a light-passing aperture comprising:

• a base member;
• a light-quantity control blade including a light-quantity control portion to control quantity of light passing through the light-passing aperture and a supported portion rotatably supported with respect to the base member;
• and
• a rotating member rotating with respect to the base member to rotate the light-quantity control blade,
• wherein:
• the light-quantity control blade is rotated by the rotating member along a curved path preformed between a convex lens surface of a first optical member and a concave lens surface of a second optical member,
• when a direction orthogonal to an aperture plane of the light-passing aperture is defined as an optical axis direction, a concave space facing the light-passing aperture is formed more inside in a direction orthogonal to the optical axis direction than the light-quantity control blade,
• the rotating member includes gear tooth serving as a driving mechanism, and
• the gear tooth constitute part of a wall portion surrounding the concave space.