| 摘要 |
<p>[Problem] It is necessary to provide a compact light-quantity control apparatus capable of forming an aperture having a good shape. [Solution] The light-quantity control apparatus includes a base member (2) provided with an opening (2b) allowing light to pass therethrough a first aperture blade (4, 7) movable with respect to the base member in a direction orthogonal to a light passing direction so as to increase and decrease its part overlapping the opening, a second aperture blade (5, 6, 8, 9) rotatable with respect to the base member in a surface orthogonal to the light passing direction so as to increase and decrease its part overlapping the opening, and a driver (1) attached to the base member and driving the first and second aperture blades. The base member is provided with a protruding portion (2d, 2e) engaging with a groove portion formed in the first aperture blade to guide the first aperture blade in its movable direction, and the second aperture blade is rotatable in the surface about the protruding portion.</p> |
