Patent ID: 9671675
Date: 2017-06-06
CPC Classifications: G03B

Claim:
1. A stop apparatus comprising: a plurality of stop blades each having a drive pin; a support member supporting pivot members of the stop blades; and a cam member having cams engaging with the drive pins, the plurality of stop blades forming an aperture, wherein the cam member includes a plurality of cams of which the largest radial distances from the center of the aperture are different from each other, the plurality of stop blades include first stop blades and second stop blades, the radial distance of the drive pins of the first stop blades from the center of the aperture and the radial distance of the drive pins of the second stop blades from the center of the aperture are different from each other in an open aperture state, and the pivot members of the first stop blades and the second stop blades are disposed at positions at a radial distance from the center of the aperture shorter than the radial distance from the center of the aperture of a drive pin having the longest radial distance from the center of the aperture in the open aperture state among the plurality of drive pins.