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

Claim 0:
1. A light shielding unit, comprising:
a first frame having a first opening through which light passes;
a second frame having a second opening through which the light passes;
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 the first frame and/or 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 support includes a first support that is provided to the first frame, the second frame, or the drive ring, which is in contact with the surface on the opposite side from the direction of upward warpage of the movable blades,
the support includes a second support that is located closer to the center axis side of the first opening, the second opening, or the third opening than the first support, and is provided so as to be in contact with the surface on the same side as the direction of the upward warpage of the movable blades, and
the second support is a protrusion that is provided in an annular shape with respect to the center axis of the first opening, the second opening, or the third opening, and protrudes to the opposite side from the direction of the upward warpage of the movable blades.