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US 9,069,230 B2Granted
Diaphragm unit, lens apparatus, and image pickup apparatus
AssigneeSony Corporation
InventorTatsuo Makii
Life of this patent
Estimating the term…
Abstract
There is provided a diaphragm unit, including a plurality of diaphragm blades structured to at least rotate, the plurality of diaphragm blades being capable of changing an area of an aperture, each of the diaphragm blades including portions on a part of an inner periphery, a R (radius) of a shape of one portion being at the opposite side of a R (radius) of a shape of the other portion, the inner periphery being a periphery forming an outer periphery of the aperture.
Claims7
A diaphragm unit, comprising:
- a plurality of diaphragm blades structured to at least rotate, the plurality of diaphragm blades being capable of changing an area of an aperture, each of the diaphragm blades including portions on a part of an inner periphery, a radius of a shape of one portion being at the opposite side of a radius of a shape of the other portion, the inner periphery being a periphery forming an outer periphery of the aperture,
- wherein the one portion whose shape has the opposite radius has a form of an envelope, wherein the envelope is a tangent to each of a plurality of arcs, diameters of the plurality of arcs being the same as aperture-diameters between a full-aperture-diameter and a predetermined-small-aperture-diameter, inclusive.
A lens apparatus, comprising:
- a diaphragm unit including a plurality of diaphragm blades structured to at least rotate, the plurality of diaphragm blades being capable of changing an area of an aperture, each of the diaphragm blades including portions on a part of an inner periphery, a radius of a shape of one portion being at the opposite side of a radius of a shape of the other portion, the inner periphery being a periphery forming an outer periphery of the aperture,
- wherein the one portion whose shape has the opposite radius has a form of an envelope, wherein the envelope is a tangent to each of a plurality of arcs, diameters of the plurality of arcs being the same as aperture-diameters between a full-aperture-diameter and a predetermined-small-aperture-diameter, inclusive;
- and
- an image pickup lens configured to guide object light to the aperture of the diaphragm unit.
1 more element
An image pickup apparatus, comprising:
- a diaphragm unit including a plurality of diaphragm blades structured to at least rotate, the plurality of diaphragm blades being capable of changing an area of an aperture, each of the diaphragm blades including portions on a part of an inner periphery, a radius of a shape of one portion being at the opposite side of a radius of a shape of the other portion, the inner periphery being a periphery forming an outer periphery of the aperture,
- wherein the one portion whose shape has the opposite radius has a form of an envelope, wherein the envelope is a tangent to each of a plurality of arcs, diameters of the plurality of arcs being the same as aperture-diameters between a full-aperture-diameter and a predetermined-small-aperture-diameter, inclusive;
- an image pickup lens configured to guide object light to the aperture of the diaphragm unit;
- and
- an image pickup device configured to receive the object light entered through the aperture, and to obtain an imaging signal.
2 more elements
Dependencies are inferred from the claim text.