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US 12,663,693 B2Granted
Light shielding unit and lens barrel equipped with the same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsTetsuya Uno, Satoshi Fukuda, Hiroki Miyaji
Life of this patent
Estimating the term…
Abstract
An aperture unit comprises a base plate, a cover, a plurality of movable blades, a drive ring, a drive motor, and rotation shafts. The movable blades are disposed between the base plate and the cover, and adjust the amount of light passing through by varying the size of the opening by opening and closing operations. The drive ring is disposed between the base plate and the cover, is rotationally driven when the movable blades are opened and closed, and has a plurality of cam pins that move along cam grooves in the movable blades. The cover has protrusions that protrude toward the movable blades along the optical axis direction and restrict the movement of the movable blades in the optical axis direction.
Claims18
A light shielding unit, comprising:
- a first frame having a substantially annular main body and a first opening that is provided to a center portion of the main body and configured to allow light to pass through along an optical axis direction;
- a second frame having a substantially annular main body and a second opening that is provided to the center portion of the main body and configured to allow light to pass through along the optical axis direction;
- a plurality of movable blades that are disposed between the first frame and the second frame, that form a third opening through which the light that has passed through the first opening passes, configured to adjust an amount of light passing through by varying a size of the third opening by opening and closing operations;
- a drive ring that is disposed between the first frame and the second frame and configured to be rotationally driven when the plurality of movable blades are opened and closed;
- a drive source configured to rotationally drive the drive ring around an optical axis;
- and
- a plurality of rotation shafts that are configured to serve as the center of rotation of the plurality of movable blades,
- wherein the second frame further has first protrusions that protrude in a direction of the movable blades along the optical axis direction, and is configured to restrict a movement of the plurality of movable blades in the optical axis direction, and
- wherein the movable blade has a cam groove,
- the drive ring has a cam pin configured to engage the cam groove and move, and
- the first protrusions are provided near the cam groove in which the cam pin for opening and closing the movable blade is inserted.
8 more elements
A light shielding unit, comprising:
- a first frame having a substantially annular main body and a first opening that is provided to a center portion of the main body and configured to allow light to pass through along an optical axis direction;
- a second frame having a substantially annular main body and a second opening that is provided to the center portion of the main body and configured to allow light to pass through along the optical axis direction;
- a plurality of movable blades that are disposed between the first frame and the second frame, that form a third opening through which the light that has passed through the first opening passes, and configured to adjust an amount of light passing through by varying a size of the third opening by opening and closing operations, and having a cam groove;
- a drive ring that is disposed between the first frame and the second frame and configured to be rotationally driven when the plurality of movable blades are opened and closed;
- and
- a drive source configured to rotationally drive the drive ring around an optical axis,
- wherein the first frame further has a first outer shape portion that conforms to substantially parallel to the cam grove in a state in which the third opening is reduced to its smallest size by a rotation of the movable blades when the drive ring is rotationally driven by the drive source.
4 more elements
A light shielding unit, comprising:
- a first frame having a substantially annular main body and a first opening that is provided to a center portion of the main body and configured to allow light to pass through along an optical axis direction;
- a second frame having a substantially annular main body and a second opening that is provided to the center portion of the main body and configured to allow light to pass through along the optical axis direction;
- a plurality of movable blades that are disposed between the first frame and the second frame, that form a third opening through which the light that has passed through the first opening passes, and configured to adjust an amount of light passing through by varying a size of the third opening by opening and closing operations;
- a drive ring that is disposed between the first frame and the second frame and configured to be rotationally driven when the plurality of movable blades are opened and closed;
- a drive source configured to rotationally drive the drive ring around an optical axis;
- and
- a plurality of rotation shafts configured to serve as a center of rotation of the plurality of movable blades,
- wherein the movable blades each have a second width portion in which a width is less than in a first width portion of a first end, and a third width portion in which the width is greater than in the second width portion, going from a first end side where the rotation shaft is provided toward a second end side that expands out toward a side of the third opening in a closed state, and
- at least a part of the first width portion or at least a part of the third width portion maintain an overlapping state in the optical axis direction with the adjacent movable blade while the third opening changes its size, and
- the second width portion does not maintain an overlapping state in the optical axis direction with the adjacent movable blade in at least one state while the third opening changes its size.
7 more elements
Dependencies are inferred from the claim text.