Patent ID: 7259922

Claim:
A light amount-adjusting device comprising: a base plate provided with an aperture in an optical path for imaging light or projected light; at least first and second blade members, each of the blade members having a base-end portion pivotally supported on the base plate, and a front-end portion facing the aperture; a driver for swingably opening and closing the blade members; first and second protrusions projecting from a surface of the base plate and from a surface of the blade members, respectively, so that when the blade members are pivotally supported on the base plate, the first and second protrusions abut against each other to define a heightwise position in each of the blade members in a direction of an optical axis, said first blade member heightwise position as defined by its first and second protrusions being different from the second blade member heightwise position as defined by its first and second protrusions; pin shaft members mounted on one of the first and the second protrusions; and bearing holes for supporting the shaft members, formed in the other of the first and the second protrusions.