| 摘要 |
<p>A lens barrel that is capable of reducing a size and cost by omitting an actuator only for diaphragm blades, and of preventing a change of a diaphragm aperture due to a variation in a part accuracy of a mechanism that drives diaphragm blades. Diaphragm blades have cam engagement parts, respectively. A holding member holds the diaphragm blades so as to be rotatable in directions to open and close an aperture. An energizing member energizes the diaphragm blades in a direction to open or close the aperture. A moving member has cam surfaces that engage with the cam engagement parts, and moves in an optical axis direction to operate the diaphragm blades by cam actions between the cam engagement parts and the cam surfaces against energizing force of the energizing member. Regulation parts regulate the operations of the diaphragm blades by the energizing force of the energizing member.</p> |
