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

Claim 26:
27. 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; and
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, the movable blades having a first main shaft or a first main hole provided on a first end side, and a free end provided on a second end side that is on the opposite side from the first main shaft or the first main hole,
wherein the movable blades have a shape exhibiting a continuous bend that is curved, starting at a position between an approximate center along a length of the blade and the first main shaft or the first main hole toward the second end side including the free end, ahead of time in the opposite direction from that of upward warpage due to blade weaving,
the movable blades have a shape that is warped to the opposite side from the direction of upward warpage of the movable blades in a state where the movable blades have moved in the direction of reducing the size of the third opening, and
the light shield unit is constituted by the movable blades having the shape that is bent.