Patent ID: 7518808

Claim:
A diaphragm device comprising: a diaphragm mechanism having a diaphragm vane and a diaphragm frame receiving the diaphragm vane; a diaphragm-mechanism cover fixed to a lens barrel to which the diaphragm mechanism is attached, the diaphragm-mechanism cover clamping the diaphragm mechanism with a receiving surface of the lens barrel; and wherein the diaphragm mechanism and the diaphragm-mechanism cover are inserted in the lens barrel through a side surface of the lens barrel, and a part of the diaphragm mechanism and a part of the diaphragm-mechanism cover protruding outward relative to the side surface of the lens barrel, and the diaphragm device further comprises a supporting member in a portion of the diaphragm-mechanism cover protruding outward relative to the side surface of the lens barrel, the supporting member supporting the diaphragm mechanism in a direction in which the diaphragm mechanism is detachable from the lens barrel, wherein the supporting member surrounds the part of the diaphragm mechanism protruding outward relative to the side surface of the lens barrel on at least two sides of the diaphragm mechanism, including an end surface of the diaphragm mechanism.