Patent ID: 9658515
Date: 2017-05-23
CPC Classifications: G03B

Claim:
1. A diaphragm device comprising: a base plate having an aperture portion; a blade being supported on the base plate for rotation around a fulcrum of the blade to open and close the aperture portion; a drive ring supported on the base plate and configured to be driven to rotate on the base plate around the aperture portion; a supporting pin pivotably supporting the fulcrum of the blade and fixed on the drive ring for rotation on the base plate together with rotation of the drive ring; and an engaging pin fixed on the base plate on a radially inner side of the drive ring, the engaging pin being in cam-linkage with the blade such that the engaging pin transforms a rotational movement of the supporting pin around the aperture portion into a rotational movement of the blade around the fulcrum of the blade.