Diaphragm unit, light intensity adjusting device, lens barrel, and imaging apparatus

摘要

A diaphragm unit includes: a pair of straight-moving diaphragm blades and a pair of swing diaphragm blades overlapping with each other in an optical axis direction of an optical system and forming a diaphragm opening centered on the optical axis by moving in directions in which the diaphragm blades get close to and apart from the optical axis along a plane perpendicular to the optical axis; a receiving member receiving the pair of straight-moving diaphragm blades and the pair of swing diaphragm blades; and a diaphragm driving mechanism adjusting the size of the diaphragm opening by moving the diaphragm blades. The receiving member has a pair of side surfaces facing each other in the optical axis direction. One and the other of the straight-moving diaphragm blades and one and the other of the swing diaphragm blades are disposed on one and the other of the side surfaces, respectively.