Abstract: The light-quantity control apparatus includes a base member, and a light-quantity control blade having a light-quantity control portion to control a quantity of light passing through a fixed aperture and a supported portion rotatably supported with respect to the base member. The light-quantity control portion and the supported portion of the light-quantity control blade are each rotated along a plane parallel to the aperture face, an intermediate portion thereof formed between the light-quantity control portion and the supported portion has a tilt with respect to the aperture plane toward the optical axis direction so that the light-quantity control portion is disposed distant from the supported portion in the optical axis direction. Thereby a concave space facing the fixed aperture is formed inside in the radial direction than the light-quantity control blade.

Abstract: A light-quantity control apparatus includes a light-quantity control blade movable along a curved path preformed between a first optical member and a second optical member, and a blade driver configured to rotate the light-quantity control blade along the curved path. A light-quantity control apparatus includes a light-quantity control blade movable along a curved path preformed between a first optical member and a second optical member, and a blade driver configured to rotate the light-quantity control blade along the curved path. 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.

Abstract: The light-quantity control apparatus includes a stop blade including a stop portion and a supported portion rotatably supported with respect to a base member, a shutter blade having a shutter portion and a supported portion rotatably supported with respect to the base member, and a driving member 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 facing the light-passing aperture is formed inside than the stop and shutter blades and the driving member.

Abstract: The light-quantity control apparatus includes a stop blade including a stop portion and a supported portion rotatably supported with respect to a base member, a shutter blade having a shutter portion and a supported portion rotatably supported with respect to the base member, and a driving member 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 facing the light-passing aperture is formed inside than the stop and shutter blades and the driving member.

Abstract: The light-quantity control apparatus includes a base member, and a light-quantity control blade having a light-quantity control portion to control a quantity of light passing through a fixed aperture and a supported portion rotatably supported with respect to the base member. The light-quantity control portion and the supported portion of the light-quantity control blade are each rotated along a plane parallel to the aperture face, an intermediate portion thereof formed between the light-quantity control portion and the supported portion has a tilt with respect to the aperture plane toward the optical axis direction so that the light-quantity control portion is disposed distant from the supported portion in the optical axis direction. Thereby a concave space facing the fixed aperture is formed inside in the radial direction than the light-quantity control blade.