Patent ID: 9152013
Filing Date: 2015-10-06
Classification: G03B

Abstract:
1. A light-quantity control apparatus comprising: multiple light-quantity control blades each configured to overlap with at least another one of the light-quantity control blades so as to form a light-passing aperture and each configured to rotate to change a size of the light-passing aperture, wherein each of the multiple light-quantity control blades includes a thick portion and a thin portion, wherein the thick portion forms an outer end portion on an opposite side to the light-passing aperture in a rotation direction of the light-quantity control blade, wherein the thin portion is formed in an aperture side blade area that overlaps with the at least another one of the multiple light-quantity control blades so as to form part of a circular overlap of the multiple light-quantity control blades and that includes an inner edge forming an edge of the light-passing aperture, wherein the thin portion has a thickness decreasing in the rotation direction from the thick portion toward the inner edge, wherein the thin portion is formed in part of each of the multiple light-quantity control blades, and wherein only the thinnest portion of the thin portion of each of the multiple light-quantity control blades forms the edge of the light-passing aperture when the light-passing aperture has the minimum stop aperture diameter.