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US 11,953,820 B2Granted
Light shielding unit and lens barrell provided with same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsToshiyuki Nakada, Tetsuya Uno, Satoshi Fukuda
Life of this patent
Estimating the term…
Abstract
An aperture unit includes a base plate, a cover, a plurality of aperture blades, a drive ring, and protrusions. The aperture blades are disposed between the base plate and the cover, and adjust the amount of light passing through by varying the size of an opening. The drive ring is disposed between the base plate and the cover, and is rotationally driven when the aperture blades are opened and closed. The protrusions are provided to the drive ring and the cover, respectively, and support the aperture blades in the direction of suppressing upward warpage of the aperture blades in a state in which the aperture blades move in the direction of reducing the size of the opening.
Claims33
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.
6 more elements
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.
7 more elements
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.
4 more elements
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.
4 more elements
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.
4 more elements
Dependencies are inferred from the claim text.