WO2013088675A1 - 光学フィルタ、光量調節装置およびそれを有する撮像装置 - Google Patents
光学フィルタ、光量調節装置およびそれを有する撮像装置 Download PDFInfo
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- WO2013088675A1 WO2013088675A1 PCT/JP2012/007784 JP2012007784W WO2013088675A1 WO 2013088675 A1 WO2013088675 A1 WO 2013088675A1 JP 2012007784 W JP2012007784 W JP 2012007784W WO 2013088675 A1 WO2013088675 A1 WO 2013088675A1
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- optical filter
- convex
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0018—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for preventing ghost images
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/02—Diaphragms
Definitions
- the present invention relates to an optical apparatus such as a video camera, a digital still camera, and an interchangeable lens, and more particularly to an optical filter such as an ND (light reduction) filter disposed in an imaging optical system for forming an object image.
- an optical filter such as an ND (light reduction) filter disposed in an imaging optical system for forming an object image.
- an ND (Neutral Density) filter for reducing the amount of transmitted light, a light of a specific wavelength, and the like to avoid deterioration of optical performance due to light diffraction at a so-called small aperture.
- a flat optical filter such as a color filter for limiting transmission, an infrared or ultraviolet cut filter for limiting transmission of near infrared rays and ultraviolet rays.
- Patent Document 1 discloses a light amount adjusting device in which a film having light absorption and anti-reflection properties is formed on the edge of an optical filter (ND filter). Further, Patent Document 2 discloses a light amount adjustment device that adds a minute sawtooth non-periodic unevenness to the edge of a diaphragm blade or an optical filter. Furthermore, according to Patent Document 3, the edge of the optical filter is constituted by a convex curve or a concave curve extending from the left and right ends to the center, in which the inclination angle of the edge changes discontinuously and the center is A light quantity adjustment device is disclosed which is formed to be farther from the optical axis than the left and right ends.
- the irregular micro-concavities are as high and low as about 0.5 to 10 ⁇ m, but such a micro-concave has an effect of scattering the reflected light. Even if it is, the effect is insufficient to disperse the directivity of the ghost due to the diffraction of light.
- Patent Document 3 the directivity of the high-brightness ghost due to the diffraction phenomenon can be dispersed to some extent, but the flare-like ghost becomes noticeable because the linear ghost spreads like a fan.
- the present invention provides an optical filter that sufficiently disperses the directivity of a linear high-brightness ghost so as not to interfere with imaging, and an imaging device including the optical filter.
- the present invention relates to an optical filter for adjusting the amount of light.
- the present invention relates to an optical filter that is disposed in an imaging optical system that forms an object image and transmits at least a part of a light flux that forms the object image.
- a convex portion and a concave portion are alternately connected in a direction in which the boundary extends in a filter edge portion where the light flux is a boundary between a region passing through the optical filter and a region not passing the optical filter. It has an uneven shape having an edge outline formed by a curve.
- the tangent of an arbitrary point between the apex of one convex portion on the curve and the bottom point of one concave portion adjacent to the convex portion is an angle formed with the tangent of the apex, and the arbitrary point is separated from the apex
- the curve is expressed by the following equation: ⁇ a 60 60 ° It has a portion satisfying the following conditions.
- An imaging apparatus having the above-mentioned optical filter in an imaging optical system also constitutes another aspect of the present invention.
- the edge of the optical filter has an edge profile formed by a continuous concave and convex curve satisfying ⁇ aa60 °, the directions of diffraction generated at the edge are effectively dispersed. Can reduce the strength of the ghost. Therefore, even in the case of shooting a high brightness subject, it is possible to suppress the generation of a linear high brightness ghost due to the diffraction at the edge of the optical filter, and it is possible to obtain a high quality shot image. .
- FIG. 1 is a diagram showing the configuration of an imaging device provided with the diaphragm device of Embodiment 1.
- FIG. 1 is a view showing a configuration of a diaphragm apparatus provided with an ND filter according to a first embodiment.
- produces in the edge part of an optical filter in (theta) a 60 degree, 75 degree, and 90 degree.
- FIG. 2 shows the configuration of an imaging apparatus such as a video camera or a digital still camera as an optical apparatus equipped with a diaphragm apparatus as a light amount adjustment apparatus according to a first embodiment of the present invention.
- an imaging apparatus such as a video camera or a digital still camera
- a diaphragm apparatus as a light amount adjustment apparatus according to a first embodiment of the present invention.
- the diaphragm device is mounted on the imaging device will be described, but the diaphragm device as the embodiment of the present invention can also be mounted on another optical device such as an interchangeable lens.
- the imaging device 1 includes an imaging optical system including lenses 11, 13, 14 and 15, and a diaphragm device 12 disposed between the lenses 11 and 13.
- the reference numeral 16 denotes a low pass and infrared cut filter
- the reference numeral 17 denotes an imaging device such as a CCD sensor or a CMOS sensor.
- a light flux from a subject enters the imaging optical system, and forms an object image on the imaging element 17 by the imaging action of the imaging optical system.
- the image sensor 17 photoelectrically converts an object image and outputs an electric signal.
- the imaging device 1 processes the electrical signal output from the imaging device 17 by an image processing circuit (not shown) to generate a photographed image.
- the photographed image is displayed on a monitor (not shown) provided in the imaging device 1 or recorded in a recording medium such as a semiconductor memory detachably inserted in the imaging device 1.
- FIG. 3 shows the diaphragm device 12 as viewed from the optical axis direction of the photographing optical system.
- Reference numeral 18 denotes a diaphragm base plate, which is formed with a fixed opening 18a through which a light beam passes.
- diaphragm blades 19a and 19b which are two light shielding blades, are attached movably in opposite directions (vertical directions in the drawing) within a plane orthogonal to the optical axis direction.
- the combination of the diaphragm blades 19a and 19b forms the diaphragm opening S.
- Guide groove holes 19c and 19d are respectively formed in the two diaphragm blades 19a and 19b, and guide pins 18b formed in the drawing base plate 18 are engaged with the guide groove holes 19c and 19d, respectively.
- the diaphragm blades 19a and 19b are guided in the movable direction.
- long holes 19e and 19f are formed in the diaphragm blades 19a and 19b respectively, and drive pins 21a and 21b provided at both ends of the drive lever 21 are inserted into these long holes 19e and 19f. ing.
- the drive lever 21 is rotated by an aperture actuator 22 constituted by a stepping motor or the like, and drives the aperture blades 19a and 19b in the movable direction via the drive pins 21a and 21b.
- the aperture diameter (diaphragm aperture diameter) of the diaphragm aperture S formed by the diaphragm blades 19a and 19b changes, and the light quantity of the light beam passing through the fixed aperture 18a, that is, passes through the photographing optical system to reach the imaging device 17. Light intensity is adjusted.
- An optical filter for reducing the light quantity as an example of an optical filter for blocking the light flux passing through the diaphragm aperture S, specifically, for adjusting the light quantity of the light flux, to one of the two diaphragm blades 19a and 19b.
- An ND (dimming) filter 20 is attached as.
- the ND filter 20 covers a part of the diaphragm opening S from the substantially open state shown in FIG. 3 to the intermediate diaphragm state where the diaphragm opening diameter is smaller than this, and further becomes the small diaphragm state where the diaphragm opening diameter is smaller. Cover the whole thing. That is, the ND (light reduction) filter 20 covers at least a part of the diaphragm aperture S whose size (diaphragm aperture diameter) is variable, and transmits at least a part of the luminous flux forming the subject image.
- the ND filter 20 is extracted and shown, and further, a part thereof is shown in an enlarged manner.
- an edge portion of the filter body (filter base material) specifically, a filter edge portion 20a which is a boundary between an area through which the light flux forming the object image passes through the ND filter 20 and an area not passing through.
- a filter edge portion 20a which is a boundary between an area through which the light flux forming the object image passes through the ND filter 20 and an area not passing through.
- the “boundary between the region where the luminous flux forming the subject image passes through the ND filter 20 and the region where it does not pass” can also be referred to as the boundary between the portion covering the aperture S of the ND filter and the portion not covering it. .
- the state in which the ND filter 20 covers a part of the diaphragm opening S so as to form such a boundary is also referred to as "the filter edge 20a enters the diaphragm opening S" in the following description.
- the asperity shape has an edge contour formed by a continuous curve.
- the outer contours of the convex portion 20b and the concave portion 20c are formed to have an arc shape with a central angle ⁇ c of 180 degrees (an arc shape with a central angle ⁇ c of 120 ° or more).
- the "formed by a continuous curve” means that it is formed only by a curve without including a linear portion. Therefore, in the present embodiment, there is an edge outline of a shape in which convex arcs having a central angle ⁇ c of 180 degrees and concave arcs are alternately connected.
- the edge outline (the convex part 20b or the concave part 20 itself, or the outline of the part where the convex part 20b and the concave part 20c are connected) includes a straight line
- the light from the high brightness object present in the photographing screen is the straight line
- the diffracted light is concentrated in the direction orthogonal to the part of the straight line.
- a linear ghost having directivity in the direction orthogonal to the portion of the straight line is generated.
- the outer edge of the filter edge portion 20a into a shape as in this embodiment, even if light from a high brightness object is diffracted by the filter edge portion 20a, the diffraction direction is dispersed.
- the directivity of the linear high-intensity ghost due to the concentration of diffracted light in a specific direction can be sufficiently suppressed.
- the uneven shape needs to satisfy the following condition (1).
- a tangent line LM at an intermediate point M at an intermediate point M which is an arbitrary point between the apex T of one convex portion 20b on the curve of the edge outline and the bottom point B of one concave portion 20c adjacent to the convex portion 20b
- the curve is ⁇ a ⁇ 60 ° (1) Part that satisfies the following conditions.
- an angle ⁇ a formed by the tangent LM at a portion where the central angle ⁇ c is 120 ° or more among the arcs of the convex portion 20b and the concave portion 20c changes from 60 ° to 90 ° with respect to the tangent line LT (1) Satisfy the conditions of the formula.
- FIG. 7 and 8 show images of simulation results of ghost due to diffraction of light generated at the optical filter edge.
- 0 °, 30 °, 60 ° and 90 ° shown in FIG. 7 correspond to the four edge shapes of the optical filter set at the time of simulation, and specifically correspond to the following edge shapes.
- 0 ° is the case where the edge shape is straight. For this reason, the angle ⁇ a formed by the tangent of an arbitrary point of the filter edge 20a and the tangent of an arbitrary point different therefrom is 0 ° no matter how these points are selected. At 0 °, as is apparent from the simulation image, a linear high-intensity ghost is generated.
- 30 °, 60 ° and 90 ° respectively indicate maximum values that can be taken by the angle ⁇ a formed by the tangent line LT at the vertex T in FIG. 1 and the tangent line LM at the middle point M.
- 90 ° indicates the edge shape shown in the first embodiment
- 30 ° and 60 ° indicate convex portions such that the central angle ⁇ c of the arcs of the convex portion 20b and the concave portion 20c is 60 ° and 120 °, respectively.
- the edge outline in which the crevice was formed is shown.
- the 60 °, 75 ° and 90 ° shown in FIG. 8 are also similar to the 30 °, 60 ° and 90 ° shown in FIG. Even at 60 °, the directivity of the ghost can be sufficiently suppressed, but at 75 ° and 90 °, the directivity of the ghost can be further suppressed and isotropically dispersed.
- the “continuous curve” forming the edge outline may be not only an arc but also an elliptic arc, a parabola, a curve represented by another function, and a curve smoothly connecting arbitrary point sequences. Also in this case, it is necessary to satisfy the above equation (1).
- the outer edges of the convex portion 20b and the convex portion 20b It is most desirable to connect them in series as arcs with an angle of 120 ° or more.
- the portion of the filter edge portion 20a that enters the diaphragm opening S may not necessarily have the above-described concavo-convex shape as a whole. That is, 50% or more, more preferably 80% or more of the entire portion of the filter edge 20a entering the diaphragm opening S within the range in which the high brightness ghost due to diffraction is inconspicuous, has the above-described uneven shape It should just be.
- the concavo-convex shape satisfy at least one of the following conditions (2) to (4).
- the distance between the apexes T of two convex portions 20b adjacent to each other across one concave portion 20c is A, and the diaphragm device is disposed in the photographic optical system Assuming that the entrance pupil diameter at the aperture S is D, A 0.1 0.1 mm (2) 0 ⁇ A / D ⁇ 1.0 (3) It is desirable to satisfy the following conditions.
- the conditions of the equations (2) and (3) are conditions for more effectively dispersing the diffraction direction of light from the high luminance object at the filter edge 20 a of the ND filter 20.
- a / D exceeds the upper limit value of the condition of the expression (3), the number of the convex portions 20b and the concave portions 20c in the entrance pupil is too small, so that the dispersion of diffracted light becomes insufficient. May not be sufficiently suppressed.
- A is less than the lower limit value of equation (2), burrs are likely to be generated during processing of the ND filter 20, and an unnatural ghost may be generated due to local reflection or diffraction at the burr generation portion. It also happens.
- the distance in the concavo-convex direction (vertical direction in the figure) from the vertex T of one convex portion 20 b to the bottom point B of the concave portion 20 c adjacent to the convex portion 20 b is H 0.1 ⁇ H / A ⁇ 1.0 (4) It is desirable to satisfy the following conditions.
- the condition of the equation (4) is also a condition for more effectively dispersing the diffraction direction of the light from the high luminance object at the filter edge portion 20a of the ND filter 20.
- H / A exceeds the upper limit value of equation (4), the tangential direction (right and left in the figure) of the apex T of the convex portion 20b in the edge contour of the pair of convex and concave portions (convex portion 20b and concave portion 20c adjacent thereto).
- the ratio of the portion extending in the direction perpendicular to the tangential direction (vertical direction in the drawing) and in the direction near this is too large compared to the portion extending in the direction (or direction) and near this. Therefore, the diffracted light at the filter edge portion 20a tends to have directivity in the tangential direction of the vertex T of the convex portion 20b.
- a numerical example (numerical example 1) corresponding to the present embodiment is shown below, and the relationship between the numerical example 1 and the conditions of formulas (3) and (4) is shown in Table 1.
- Example # 1 Curvature radius of arc of convex portion 20b and concave portion 20c 0.1 mm Distance A 0.4 mm Distance H 0.2 mm
- FIG. 4 shows an ND filter 30 used in the diaphragm apparatus which is Embodiment 2 of the present invention.
- the ND filter 30 is attached to the diaphragm blade 19b in place of the ND filter 20 in the diaphragm device described in the first embodiment.
- the filter edge portions 30a and 30a 'that enter the aperture S have a convex-concave shape in which the convex portion and the concave portion are alternately connected in the horizontal direction of the drawing Have.
- the asperity shape has an edge contour formed by a continuous curve.
- the outer contours of the convex portion and the concave portion are respectively formed by arcs having a central angle ⁇ c of 180 degrees.
- the sizes of the convex portions and the concave portions are changed in the horizontal direction of the drawing.
- the radius of curvature of the outer contour of the convex portion and the concave portion gradually (or stepwise) increases from the center portion 30a in the left-right direction of the filter edge toward the left and right end 30a '.
- the distance A and the distance H also gradually (or stepwise) increase from the central portion 30a to the left and right ends 30a '.
- the present embodiment also satisfies the conditions of the equations (1) to (4) described in the first embodiment.
- the numerical example (numerical example 2) corresponding to a present Example below
- the relationship between the said numerical example 2 and the conditions of (3), (4) Formula is shown in Table 1.
- Example 2 Radius of curvature of arc of convex and concave central part (minimum) 0.1 mm
- Right and left end (maximum) 0.5mm
- the filter edge portions 30a and 30a ' even if light from a high brightness object is diffracted at the filter edge portions 30a and 30a ', the diffraction direction is dispersed, and diffracted light is concentrated in a specific direction. The occurrence of linear high-intensity ghosts can be suppressed.
- the radius of curvature of the convex portion and the concave portion at the filter edge decreases from the left and right ends 30a 'toward the central portion 30a.
- the number of parts and recesses is not to be greatly reduced. For this reason, compared with Example 1, the said effect can be maintained to a smaller aperture
- FIG. 5 shows an ND filter 40 used in the diaphragm apparatus which is Embodiment 2 of the present invention, and shows a part of the ND filter 40 in an enlarged manner.
- This ND filter 40 is also attached to the diaphragm blade 19b in place of the ND filter 20 in the diaphragm device described in the first embodiment.
- the filter edge 40a of the ND filter 40 of the present embodiment which enters the aperture S, has a concavo-convex shape in which convex portions and concave portions are alternately connected in the lateral direction of the drawing (the direction in which the boundary in the first embodiment extends).
- the asperity shape has an edge contour formed by a continuous curve.
- the outer contours of the convex portion and the concave portion are each formed by a circular arc having a central angle ⁇ c of 210 degrees.
- the angle ⁇ a formed by the tangent LM at a portion where the central angle ⁇ c is 140 ° or more among the arcs of the convex portion 40b and the concave portion 40c changes between 60 ° and 105 °, 1) Satisfy the condition of the equation.
- ⁇ a be 120 degrees or less.
- the present embodiment also satisfies the conditions of the equations (1) to (4) described in the first embodiment. Moreover, while showing the numerical example (numerical example 3) corresponding to a present Example below, the relationship between the said numerical example 3 and the conditions of (3), (4) Formula is shown in Table 1. (Example 3) Curvature radius of arc of convex and concave parts 0.1 mm Distance A 0.386 mm Distance H 0.252 mm
- FIG. 6 shows an ND filter 50 used in the stop device which is Embodiment 4 of the present invention.
- the ND filter 50 is also attached to the diaphragm blade 19b in place of the ND filter 20 in the diaphragm device described in the first embodiment.
- the filter edge 50a of the ND filter 50 of the present embodiment which enters the aperture S, has a concavo-convex shape in which convex portions and concave portions are alternately connected in the lateral direction of the drawing (the direction in which the boundary in the first embodiment extends).
- the asperity shape has an edge contour formed by a continuous curve.
- the outer contours of the convex portion and the concave portion are respectively formed by arcs having a central angle ⁇ c of 180 degrees.
- the sizes of the convex portion and the concave portion are irregularly changed in the lateral direction of the drawing. That is, the radii of curvature of the outer contours of the convex portion and the concave portion included in the filter edge portion 50a increase and decrease regularly from one of the left and right ends to the other. Due to the change in the radius of curvature of the outer contours of the convex portion and the concave portion, the distance A and the distance H also increase and decrease regularly from one of the left and right ends to the other.
- the present embodiment also satisfies the conditions of the equations (1) to (4) described in the first embodiment. Moreover, while showing the numerical example (numerical example 4) corresponding to a present Example below, the relationship between the said numerical example 4 and the conditions of (3), (4) Formula is shown in Table 1. (Example number 4) Curvature radius of arc of convex and concave parts 0.1 mm to 0.5 mm Distance A 0.4mm-2.0mm Distance H 0.2 mm to 1.0 mm
- the diffraction direction is dispersed, and the diffracted light is concentrated in a specific direction.
- the occurrence of high brightness ghost can be suppressed.
- the ND filter attached to the diaphragm blade disposed in the light amount adjustment device has been described, but the diaphragm blade and the ND filter are separately provided in the light amount adjustment device and driven independently of each other
- the present invention can also be practiced in other configurations.
- a color filter other than the ND filter for example, a color filter for limiting transmission of light of a specific wavelength, an infrared or ultraviolet cut for limiting transmission of near infrared light or ultraviolet light
- the present invention can be practiced even with a filter or the like.
- the light quantity adjusting device in which two diaphragm blades are provided has been described.
- the present invention can be practiced in a light quantity adjusting device having three or more diaphragm blades.
- the case where the center of the curvature radius of all the convex portions and concave portions of the filter edge is disposed on a straight line has been described, but the curvature radius of all convex portions and concave portions
- the line connecting the centers of may be a curve such as an arc or a parabola.
- a line connecting only the center of the curvature radius and a line connecting only the center of the curvature radius of the recess may be a curve such as an arc or a parabola.
- the optical filter which enters the imaging optical system and whose edge enters the light path for forming the object image is one of the ND filters in the light amount adjustment device.
- An imaging device in which two or more optical filters enter the imaging optical system is also included in the embodiments of the present invention.
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Abstract
Description
θa≧60°
なる条件を満足する部分を有することを特徴する。
θa≧60° …(1)
なる条件を満足する部分を含む。本実施例では、凸部20bと凹部20cの円弧のうち中心角θcが120°以上の部分での接線LMが接線LTに対してなす角度θaが60°から90°まで変化し、(1)式の条件を満足する。
A≧0.1mm …(2)
0<A/D<1.0 …(3)
なる条件を満足することが望ましい。
0.1<H/A<1.0 …(4)
なる条件を満足することが望ましい。
0<A/D<0.5 …(3)′
0.1<H/A<0.8 …(4)′
(数値例1)
凸部20bと凹部20cの円弧の曲率半径 0.1mm
距離A 0.4mm
距離H 0.2mm
(数値例2)
凸部と凹部の円弧の曲率半径 中央部(最小) 0.1mm
左右端(最大) 0.5mm
距離A 0.4mm~2.0mm
距離H 0.2mm~1.0mm
(数値例3)
凸部と凹部の円弧の曲率半径 0.1mm
距離A 0.386mm
距離H 0.252mm
(数値例4)
凸部と凹部の円弧の曲率半径 0.1mm~0.5mm
距離A 0.4mm~2.0mm
距離H 0.2mm~1.0mm
19a,19b 絞り羽根
20,30,40,50 NDフィルタ
20a,30a,30a′40a,50a フィルタ縁部
20b,40b 凸部
20c,40c 凹部
Claims (8)
- 光量を調整する光学フィルタであって、
光束が通過する領域と通過しない領域との境界となるフィルタ縁部は、該境界が延びる方向に凸部と凹部が交互に連なる連続した曲線により形成された縁外形を有する凹凸形状を有し、
前記曲線上における1つの前記凸部の頂点と該凸部に隣接する1つの前記凹部の底点との間の任意点の接線が前記頂点の接線となす角度であって、前記任意点が前記頂点から離れるほど大きくなる角度をθaとするとき、前記曲線は、
θa≧60°
なる条件を満足する部分を有することを特徴する光学フィルタ。 - 被写体像を形成する撮像光学系内に配置される光学フィルタであって、
該光学フィルタは、前記被写体像を形成する光束の少なくとも一部を覆い、
前記光束が該光学フィルタを通過する領域と通過しない領域との境界になるフィルタ縁部は、該境界が延びる方向に凸部と凹部が交互に連なる連続した曲線により形成された縁外形を有する凹凸形状を有し、
前記曲線上における1つの前記凸部の頂点と該凸部に隣接する1つの前記凹部の底点との間の中間点の接線が前記頂点の接線となす角度であって、前記中間点が前記頂点から離れるほど大きくなる角度をθaとするとき、前記曲線は、
θa≧60°
なる条件を満足する部分を有することを特徴する光学フィルタ。 - 前記縁外形のうち前記凸部に対応する部分と前記凹部に対応する部分がともに円弧形状を有しており、
前記各円弧形状の中心角θcが、
θc≧120°
なる条件を満足することを特徴とする請求項1または2に記載の光学フィルタ。 - 前記凹凸形状は、1つの前記凹部を挟んで互いに隣り合う2つの前記凸部の頂点間の距離をAとし、該光量調節装置を前記撮像光学系内に配置したときの前記絞り開口における入射瞳径をDとするとき、
A≧0.1mm
0<A/D<1.0
なる条件を満足することを特徴とする請求項1から3のいずれか1項に記載の光学フィルタ。 - 前記凹凸形状は、1つの前記凸部の頂点から該凸部に隣接する前記凹部の底点までの凹凸方向での距離をHとするとき、
0.1<H/A<1.0
なる条件を満足することを特徴とする請求項1から4のいずれか1項に記載の光学フィルタ。 - 前記凸部と前記凹部の大きさが、前記境界が延びる方向において変化していることを特徴とする請求項1から5のいずれか1項に記載の光学フィルタ。
- 絞り開口の大きさが可変であり、請求項1から6のいずれか1項に記載の光学フィルタが前記絞り開口の少なくとも一部を覆うように配置されていることを特徴とする光量調節装置。
- 請求項1から6のいずれか1項に記載の光学フィルタを含み、被写体からの光により被写体像を形成する撮像光学系を有することを特徴とする撮像装置。
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EP12858637.7A EP2793060A4 (en) | 2011-12-12 | 2012-12-05 | OPTICAL FILTER, LIGHT VOLUME ADJUSTING DEVICE, AND IMAGE CAPTURE DEVICE COMPRISING SAME |
CN201280061466.1A CN103988098A (zh) | 2011-12-12 | 2012-12-05 | 光学滤波器、光量调节设备和包括该光学滤波器的摄像设备 |
JP2013549104A JP5893048B2 (ja) | 2011-12-12 | 2012-12-05 | 光学フィルタ、光量調節装置およびそれを有する撮像装置 |
US14/300,380 US20140285704A1 (en) | 2011-12-12 | 2014-06-10 | Optical filter, light quantity control apparatus and image capturing apparatus |
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JP2011-271785 | 2011-12-12 | ||
JP2011271785 | 2011-12-12 |
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US14/300,380 Continuation US20140285704A1 (en) | 2011-12-12 | 2014-06-10 | Optical filter, light quantity control apparatus and image capturing apparatus |
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WO2013088675A1 true WO2013088675A1 (ja) | 2013-06-20 |
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US (1) | US20140285704A1 (ja) |
EP (1) | EP2793060A4 (ja) |
JP (1) | JP5893048B2 (ja) |
CN (1) | CN103988098A (ja) |
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JP6727800B2 (ja) | 2015-03-05 | 2020-07-22 | キヤノン株式会社 | 光量調節装置、レンズ鏡筒、および光学装置 |
CN112433419B (zh) * | 2017-02-24 | 2022-03-25 | 大立光电股份有限公司 | 遮光片、光学镜片组、成像镜头与电子装置 |
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JPH08297240A (ja) * | 1995-04-25 | 1996-11-12 | Canon Inc | 色分解光学系 |
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-
2012
- 2012-12-05 JP JP2013549104A patent/JP5893048B2/ja active Active
- 2012-12-05 WO PCT/JP2012/007784 patent/WO2013088675A1/ja active Application Filing
- 2012-12-05 EP EP12858637.7A patent/EP2793060A4/en not_active Withdrawn
- 2012-12-05 CN CN201280061466.1A patent/CN103988098A/zh active Pending
-
2014
- 2014-06-10 US US14/300,380 patent/US20140285704A1/en not_active Abandoned
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JPH05281590A (ja) * | 1992-04-02 | 1993-10-29 | Canon Inc | 画質の低下を防いだ絞り及び絞りを具えた光学装置 |
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Also Published As
Publication number | Publication date |
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EP2793060A1 (en) | 2014-10-22 |
CN103988098A (zh) | 2014-08-13 |
JPWO2013088675A1 (ja) | 2015-04-27 |
EP2793060A4 (en) | 2015-08-05 |
US20140285704A1 (en) | 2014-09-25 |
JP5893048B2 (ja) | 2016-03-23 |
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