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

Claim 28:
29. 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; 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,
wherein the movable blades include first 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, and second blades having a rotating portion that is provided on a second end side that is the opposite side from a second main shaft or a second main hole, and rotates along a gap between the first frame and the second frame,
the second blades are in a state in which the first end and the second end are always held between the first frame and the second frame in any state in which the second blades have rotated to reduce an opening diameter of the third opening, so that the first end and the second end remain sandwiched between the first frame and the second frame and are not exposed via the first opening or the second opening in the optical axis direction, and
the first blades and the second blades are disposed alternately in the circumferential direction on at least some blades.