Patent ID: 11953820
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 24:
25. A light shielding unit, comprising:
a first frame having a first opening through which light passes in an optical axis direction;
a second frame having a second opening through which the light passes in the optical axis direction;
a plurality of movable blades that are disposed between the first frame and the second frame, in which is formed a third opening through which the light that has passed through the first opening passes, and that adjust the amount of light passing through by varying the size of the third opening;
a drive ring that is disposed between the first frame and the second frame and is rotatably driven when the movable blades are opened and closed; and
a support that is provided to at least of the drive ring, the first frame and the second frame and supports the movable blades in the direction of suppressing upward warpage of the movable blades in a state in which the movable blades have moved in the direction of reducing the size of the third opening,
wherein the movable blades have a first main shaft or a first main hole, and a first auxiliary shaft or a first auxiliary hole, and
the movable blades include first blades having a rotating portion that is provided on a second end side that is the opposite side from the first main shaft or the first main hole, and rotates along a gap between the first frame and the second frame so that the second end side remains sandwiched between the first frame and the second frame and is not exposed via the first opening or the second opening in the optical axis direction, and
when the drive ring is rotationally driven, there is a change in the relative positions between the first main shaft or the first main hole and the first auxiliary shaft or the first auxiliary hole, and
the first blades rotate around the first main shaft or the first main hole, and the size of the third opening changes.