Patent ID: 8167508

Claim:
A light amount adjusting device comprising: a cover plate having a light-passing hole; a first separator being sheet-shaped and having a hole; a second separator being elastically deformable and sheet-shaped, positioned on a side opposite to the cover plate with the first separator therebetween, and having a hole; a first light amount adjusting blade being movable between the cover plate and the first separator, for adjusting an amount of light; a second light amount adjusting blade being movable between the first separator and the second separator, for adjusting the amount of light; a base body to which the cover plate, the first separator, and the second separator are mounted, having a throughhole and mounting grooves, the throughhole being formed to have a diameter larger than a diameter of the hole of the second separator, the mounting grooves allowing the second separator to be mounted therein and being opened toward the throughhole, a first actuator for operating the first light amount adjusting blade; and a second actuator for operating the second light amount adjusting blade, wherein the second separator is mounted onto the base body by inserting at least a part of an outer circumferential portion of the second separator into the mounting grooves, by positioning the second separator further toward the second light amount adjusting blade than the throughhole, and by positioning the hole on an inner side of the throughhole.