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

Claim 31:
32. 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 fixed opening sheet that is fixed to the second frame and constitutes a fixed opening with substantially the same size as or smaller than the third opening when the movable blades are in a fully opened state, and
a spacer part that is a part of the second frame and is provided to between the movable blades and the fixed opening which is in an optical axis direction,
wherein, when the movable blades move in the direction of reducing the size of the third opening, the movable blades move in the same direction as the direction of the upward warpage, so as to go beyond the virtual plane constituting the fixed opening formed by the fixed opening sheet, and
the fixed opening sheet is provided to an opposite side of the movable blades in the optical axis direction so that the fixed opening sheet sandwiches the spacer part with the movable blades.