Patent ID: 8757903

Claim:
A diaphragm device of a lens, the diaphragm device comprising: a diaphragm setting ring rotatably mounted on a stationary tube of a lens barrel so as to be able to adjust a lens aperture; a click mechanism capable of stopping the diaphragm setting ring at positions corresponding to a plurality of aperture numbers with click action, the click mechanism including: a locking portion disposed in one of the stationary tube and the diaphragm setting ring, the locking portion having an elastically supported locking element; and an entrapment body disposed on the other of the stationary tube and the diaphragm setting ring, the entrapment body having an entrapment surface extending orthogonally relative to a longitudinal direction of the lens barrel, said entrapment surface including a plurality of entrapment portions formed thereon, the entrapment portions being capable of catching the locking element pressed against the entrapment surface in a longitudinal direction at one of the positions corresponding to the plurality of aperture numbers when the diaphragm setting ring is turned; and a mode select mechanism which makes it possible to switch the diaphragm device between click mode in which the locking element is longitudinally pressed against the entrapment surface and non-click mode in which a click function is deactivated with the locking element and the entrapment surface separated from each other by altering the position of at least one of the locking portion and the entrapment body.