Light amount adjustment device, lens apparatus, and imaging apparatus

Abstract

To provide a light amount adjustment device capable of acquiring a captured image without discomfort while obtaining a favorable blurring taste.SOLUTION: A light amount adjustment device for adjusting light amounts of a first optical system and a second optical system comprises: a first opening and a second opening that allow light to pass therethrough; a drive unit that drives blade members; a first opening / closing unit that is constituted by three or more blade members and opens and closes at least a part of the first opening in response to driving of the drive unit; and a second opening / closing unit that is constituted by the same number of blade members as the blade members that constitute the first opening / closing unit and opens and closes at least a part of the second opening in response to driving of the drive unit. The first opening / closing unit and the second opening / closing unit are arranged such that, when images acquired by photographing using each of the first and second optical systems are superimposed, intervals between light streaks generated when light passes through an opening formed by each of the first and second opening / closing units are equal.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a light amount adjusting device having a compound eye optical system. [Background technology]

[0002] Conventionally, stereoscopic image capturing devices and VR video capturing devices that capture images using a compound eye optical system equipped with multiple optical systems have been known. Patent Document 1 discloses a light amount adjusting device that adjusts the light amount of each optical system by opening and closing multiple blade members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-119615 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the light amount adjustment device of Patent Document 1, the number of blade members is one or two for each aperture, so the resulting blur shape is a polygonal shape with a small number of sides. When an iris diaphragm is used to obtain a polygonal shape with a large number of sides in order to obtain good blur, if the phase of the light striations that may occur when the light source is captured differs in each optical system, the phase shift of the light striations when the captured images are superimposed will be unevenly spaced, which may appear unnatural.

[0005] An object of the present invention is to provide a light amount adjustment device that can obtain a natural-looking photographed image while achieving a good blur effect. [Means for solving the problem]

[0006] A light intensity adjustment device according to one aspect of the present invention is a light intensity adjustment device that adjusts the light intensity of first and second optical systems, and includes first and second openings that allow light to pass through, a drive unit that drives blade members, a first opening / closing unit that is composed of three or more blade members and opens and closes at least a portion of the first opening in response to the drive unit, and a second opening / closing unit that is composed of the same number of blade members as the blade members that make up the first opening / closing unit and opens and closes at least a portion of the second opening in response to the drive unit, and is characterized in that the first opening / closing unit and the second opening / closing unit are arranged so that when images obtained by photographing using each of the first and second optical systems are superimposed, the spacing between light striations that occur when light passes through the openings formed by each of the first and second opening / closing units is equal. [Effects of the Invention]

[0007] An object of the present invention is to provide a light amount adjustment device that can obtain a natural-looking photographed image while achieving good bokeh. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram of an imaging apparatus according to a first embodiment. [Figure 2] FIG. 1 is a perspective view of a light amount adjusting device according to a first embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the light amount adjusting device according to the first embodiment. [Figure 4] 4 is an explanatory diagram of the rotation direction of the blade driving member and the phase of the blade member of the light amount adjusting device according to the first embodiment. FIG. [Figure 5] FIG. 1 is an explanatory diagram of the principle of striation generation. [Figure 6] FIG. 1 is a diagram showing striations. [Figure 7] 10A and 10B are diagrams for explaining how the state of striations differs depending on the shape of the aperture. [Figure 8] 3A and 3B are explanatory diagrams of striations generated in the compound eye optical system unit of Example 1. FIG. [Figure 9] 10A and 10B are diagrams illustrating an example of striations that occur when the shape of the opening in Example 2 is an odd polygon. [Figure 10]10A and 10B are diagrams showing an example of striations that occur when the shape of the opening in Example 2 is an even polygon. [Figure 11] 10A and 10B are diagrams showing other examples of striations that occur when the shape of the opening in Example 2 is an odd polygon. [Figure 12] FIG. 10 is an explanatory diagram of the configuration of a light amount adjusting device according to a third embodiment. [Figure 13] FIG. 10 is an explanatory diagram of the configuration of a light amount adjusting device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same components, and redundant explanations will be omitted. (First Example) 1 is a block diagram of an imaging device 10 of this embodiment. The imaging device 10 has a camera body 1 and a compound optical system unit (compound optical system, lens device) 20 that includes a first optical system 2 and a second optical system 3. The compound optical system unit 20 may be fixed to the camera body 1, or may be detachable from the camera body 1 like an interchangeable lens.

[0010] The first optical system 2 and the second optical system 3 each include an imaging optical system 201, 301 including a lens unit that is configured identically to determine the focal length and focus. The imaging optical systems 201, 301 include a light amount adjustment device 100. The imaging optical systems 201, 301 may be configured with a single lens, or may be configured with a collection of multiple lenses that move as a unit when adjusting the focal length and focus position.

[0011] The light intensity adjustment device 100 includes a plurality of blade members (not shown) and an opening / closing mechanism (not shown) that opens and closes the plurality of blade members, and adjusts the light intensity of each optical system. The opening / closing mechanism of the light intensity adjustment device 100 is driven by a light intensity adjustment drive unit (drive unit) 105 that serves as a driving means. The light intensity adjustment device 100 is a so-called iris diaphragm in which a plurality of blade members arranged around an optical axis partially overlap each other to form an aperture (aperture) on the optical axis. In this embodiment, since the first optical system 2 and the second optical system 3 each have an optical axis, the optical axis of the first optical system 2 is designated OA, and the optical axis of the second optical system 3 is designated OB.

[0012] The aperture value (F-number) increases or decreases depending on the positions of the blade members. The overlap amount of the blade members also changes depending on the positions of the blade members, and the operating load on the light amount adjustment drive unit 105 changes. Generally, as the aperture value, i.e., the overlap amount of the blade members, increases, the operating load also increases.

[0013] The light intensity adjustment drive unit 105 is configured with a stepping motor and is controlled by one of the lens control units 204, 304 provided in the first optical system 2 and the second optical system 3, respectively. Specifically, one of the lens control units 204, 304 controls the drive direction of the light intensity adjustment drive unit 105 by changing the polarity of a drive signal applied to the light intensity adjustment drive unit 105, and controls the drive position of the light intensity adjustment drive unit 105 by increasing or decreasing the number of pulses of the drive signal. This makes it possible to control the amount of opening and closing (aperture amount, aperture diameter) of the multiple blade members in the light intensity adjustment device 100. The light intensity adjustment drive unit 105 may be provided with an aperture position detection unit (not shown) that detects the position of the multiple blade members corresponding to the maximum aperture value (maximum F-number).

[0014] The lens control units 204, 304 control the aperture amount (aperture diameter) of the light amount adjustment device 100 based on a signal (target aperture value signal) received from the camera body 1 via the lens communication units 205, 305. The lens control units 204, 304 also control the aperture diameter of the light amount adjustment device 100 based on a drive instruction control amount corresponding to the brightness (aperture value).

[0015] The camera body 1 includes a first imaging element 12, a second imaging element 13, a camera control unit 14, and camera communication units 15 and 16. The first and second imaging elements 12 and 13 include a CMOS sensor or a CCD sensor, and each photoelectrically converts an optical image (subject image) formed via the first optical system 2 and the second optical system 3 to output image data. In this embodiment, an imaging element is provided for each imaging optical system, but a single imaging element may be configured to output multiple pieces of image data.

[0016] The camera control unit 14 controls the first image sensor 12, the second image sensor 13, and the camera communication units 15 and 16. The camera control unit 14 transmits information about the target aperture value of the light amount adjustment device 100 to the lens control units 204 and 304 via the camera communication units 15 and 16 and the lens communication units 205 and 305.

[0017] Fig. 2 is a perspective view of the light amount adjustment device 100. Fig. 3 is an exploded perspective view of the light amount adjustment device 100. The light amount adjustment device 100 includes an aperture base plate (base member) 101, a first aperture drive member (first drive member) 120, a second aperture drive ring (second drive member) 121, a cam plate (holding member) 103, a plurality of blade members 104, and a light amount adjustment drive unit 105.

[0018] The aperture base plate 101 has a first opening 101a centered on the optical axis OA of the first optical system 2 and a second opening 101b centered on the optical axis OB of the second optical system 3. Multiple fitting receivers 101c that hold fitting diameter portions 120a provided on the first aperture drive ring 120 are arranged evenly along the circumferential direction in the first opening 101a. The first aperture drive ring 120 is rotatably fitted into the first opening 101a. Multiple fitting receivers 101d that hold fitting diameter portions 121a provided on the second aperture drive ring 121 are arranged evenly along the circumferential direction in the second opening 101b. The second aperture drive ring 121 is rotatably fitted into the second opening 101b. Furthermore, the aperture base plate 101 has a bearing reference hole 101e provided at a predetermined position relative to the central axis. The bearing 105b coaxially and rotatably supports the rotary drive shaft 105a of the light amount adjustment drive unit 105. The bearing 105b is inserted into the bearing reference hole 101e, and a fixing portion 105c provided on the light amount adjustment drive unit 105 is fixed to the diaphragm base plate 101 with a screw or the like, thereby disposing the rotary drive shaft 105a in a predetermined position.

[0019] The pinion gear (transmission member) 106 is fixed to the rotary drive shaft 105a. A first ring gear (first transmission unit) 120b is provided on the periphery of the first aperture drive ring 120. The first ring gear (first transmission unit) 120b engages with the pinion gear 106 and rotates the first aperture drive ring 120 by receiving the rotational drive force of the light intensity adjustment drive unit 105. The second ring gear (second transmission unit) 121b is provided on the periphery of the second aperture drive ring 121. The first and second aperture drive rings 120 and 121 rotate in conjunction with the rotational drive of the pinion gear 106, with their central axes coinciding with the optical axes OA and OB as their rotational centers. In this embodiment, one drive unit is provided to drive the first and second drive rings 120 and 121, but two drive units may be provided to drive the first and second aperture drive rings 120 and 121, respectively.

[0020] The cam plate 103 is supported by the diaphragm base plate 101 in a state where an operating space is secured for the plurality of blade members 104 and the first and second diaphragm drive rings 120, 121. The cam plate 103 is provided with a first opening hole portion 103a that opens coaxially with the first opening portion 101a, and a second opening hole portion 103b that opens coaxially with the second opening portion 101b.

[0021] The blade members 104 are common parts, and the same number (three or more) are evenly arranged around the circumferential direction of each of the rotation axes of the first and second aperture drive rings 120 and 121. The blade members 104 arranged around the circumferential direction of the first aperture drive ring 120 function as a first opening / closing unit that opens and closes at least a portion of the first opening 101a in response to the drive of the light amount adjustment drive unit 105. The blade members 104 arranged around the circumferential direction of the second aperture drive ring 121 function as a second opening / closing unit that opens and closes at least a portion of the second opening 101b in response to the drive of the light amount adjustment drive unit 105. The first and second aperture drive rings 120 and 121 and the multiple blade members 104 are housed between the aperture base plate 101 and the cam plate 103. The blade member 104 is provided with a rotation pin (first engaging member) 104a that serves as the rotation center and a cam pin (second engaging member) 104b that rotates the blade member 104. The rotation pin 104a and the cam pin 104b may be hole-shaped.

[0022] Rotation holes 120c into which the rotation pins 104a fit are formed evenly along the circumferential direction in the first aperture drive ring 120. Rotation holes 121c into which the rotation pins 104a fit are formed evenly along the circumferential direction in the second aperture drive ring 121. The blade members 104 are supported rotatably with respect to the rotation pins 104a.

[0023] Cam grooves (cam shapes) 103c into which cam pins 104b engage are provided coaxially with the central axis of first opening hole 103a and evenly spaced along the circumferential direction on cam plate 103. When first aperture drive ring 120 rotates, cam pins 104b rotate blade member 104 around rotation pin 104a along cam grooves 103c.

[0024] Cam grooves (cam shapes) 103d, into which cam pins 104b engage, are provided coaxially with the central axis of second opening hole 103b and evenly spaced along the circumferential direction on cam plate 103. When second aperture drive ring 121 rotates, cam pins 104b rotate blade member 104 around rotation pin 104a along cam grooves 103d.

[0025] The multiple blade members 104 are arranged evenly around the circumference with the same support structure, so that the light intensity can be adjusted by setting the desired aperture diameter centered on the optical axis of each optical system by rotating the first and second aperture drive rings 120 and 121. The aperture diameter is adjusted by changing the relative phase between the first and second aperture drive rings 120 and 121 and the cam plate 103, which rotates the blade members 104.

[0026] In this embodiment, the first and second aperture drive rings 120 and 121 are provided with a hole shape into which the rotation pin 104a engages, and the cam plate 103 is provided with a hole shape (cam groove) into which the cam pin 104b engages. However, other configurations are possible as long as the blade member 104 rotates in response to the rotation of the first and second aperture drive rings 120 and 121, thereby adjusting the light intensity. For example, the first and second aperture drive rings 120 and 121 may be provided with a hole shape (cam groove) into which the cam pin 104b engages, and the cam plate 103 may be provided with a hole shape into which the rotation pin 104a engages. That is, it is sufficient that one of the first and second aperture drive rings 120 and 121 and the cam plate 103 is provided with a hole shape into which the rotation pin 104a engages, and the other is provided with a hole shape (cam groove) into which the cam pin 104b engages. Furthermore, a hole shape into which the rotation pin 104a engages may be provided in the aperture base plate 101, and a hole shape (cam groove) into which the cam pin 104b engages may be provided in the first and second aperture drive rings 120, 121. Even in this case, it is sufficient that a gap is formed on the opposing side of the first and second aperture drive rings 120, 121 across the blade member 104, allowing the blade member 104 to rotate.

[0027] 4 is an explanatory diagram of the rotation directions of the first and second aperture drive rings 120, 121 and the phase of the blade member 104. Fig. 4(a) shows the light amount adjustment device 100 in an open state, and Fig. 4(b) shows the light amount adjustment device 100 in a closed state. In this embodiment, the phase of the blade member 104 refers to the position of the rotation pin 104a relative to the horizontal direction.

[0028] Optical axis OA, which is the central axis of first opening 101a, and optical axis OB, which is the central axis of second opening 101b, are disposed at a 1:1 distance from the central axis of bearing reference hole 101e that holds light intensity adjustment drive unit 105. Pinion gear 106 is engaged with first and second ring gears 120b, 121b at the same reduction ratio, and rotation of light intensity adjustment drive unit 105 allows first and second aperture drive rings 120, 121 to rotate in the same direction and by the same angle. As a result, in the first and second optical systems 2, 3, the aperture diameters of each optical system change synchronously with rotation of light intensity adjustment drive unit 105, making it possible to adjust the light intensity.

[0029] The number of blade members 104 arranged evenly around the optical axis OA, which is the central axis of the first opening 101a, and the number of blade members 104 arranged evenly around the optical axis OB, which is the central axis of the second opening 101b, are the same. Furthermore, the phase arrangement of the blade members 104 arranged around each optical axis is arranged so as to be approximately the same. Note that in this embodiment, six blade members 104 are arranged for each optical system, but the number of blade members 104 is not limited to this.

[0030] As shown in FIG. 4(b), the shape of the opening formed by the blade members 104 is polygonal. The phase arrangement of the blade members 104 arranged around each optical axis is consistent. That is, the phases of corresponding blade members 104 are in phase. Therefore, the angular phases of the polygons formed in the stopped-down state are also consistent. Therefore, the phases (positions in the direction around the optical axis) of the striations generated when light passes through each optical system are consistent. As a result, when images captured using a VR video capture device or the like are viewed in an overlapping manner, the phase shifts of the striations are consistent, resulting in a natural image. Note that consistency and consistency in phase do not only refer to strict consistency or consistency in phase, but also include substantial consistency or consistency in phase (approximate consistency or approximately consistency in phase). Furthermore, it is desirable that the deviation (angle or phase shift) of the spacing between adjacent striations (angle between phases) from the design value is less than 5 degrees.

[0031] FIG. 5 is an explanatory diagram of the principle of the generation of striations that occur when light passes through an optical system. FIG. 6 is a diagram illustrating striations. FIG. 5(a) shows light from a light source passing through the blade member 104. FIG. 5(b) shows striations that occur when light passes through the blade member 104 and is irradiated onto the edge surface of the opening formed by the blade member 104. As shown by the solid line in FIG. 5(a), a portion of the light that passes through the optical system is blocked by the blade member 104, while the other portion passes through the opening. Of the light that passes through the opening, light diffracted at the edge surface of the opening spreads, also wrapping around behind the blade member 104, as shown by the dashed line. The light diffracted at the edge surface spreads in a band-like shape outside and inside the edge surface, as shown in FIG. 5(b). This causes a phenomenon called striations, as shown in FIG. 6.

[0032] Figure 7 is a diagram illustrating the difference in streaks of light depending on the shape of the aperture. Figure 7(a) shows a schematic representation of streaks of light when the shape of the aperture is an even polygon with an even number of sides. Figure 7(b) shows a schematic representation of streaks of light when the shape of the aperture is an odd polygon with an odd number of sides.

[0033] When the aperture shape is an even polygon, there are end faces facing each other across the optical axis, so the light rays generated at each of the opposing end faces overlap and appear to be a single light ray. In this case, the number of light rays generated is the same as the number of sides of the polygon. In Figure 7(a), since the aperture shape is hexagonal, six light rays appear to be radiating from the optical axis.

[0034] When the aperture shape is an odd polygon, there are no end faces facing each other across the optical axis, so it appears as if twice as many rays are generated as there are end faces.In Figure 7(b), the aperture shape is pentagonal, so it appears as if 10 rays are radiating from the optical axis.

[0035] FIG. 8 is an explanatory diagram of the striations generated in the composite optical system unit 20 of Example 1. FIG. 8(a) shows the striations generated in each optical system. As shown in FIG. 8(a), in this example, the striations generated in each optical system have the same phase. Here, "same" does not only mean "strictly the same" but also "substantially the same (almost the same)." FIG. 8(b) is a diagram showing how the striations shown in FIG. 8(a) appear when the captured image is superimposed and confirmed using a VR video capture device or the like. As shown in FIG. 8(b), the striations generated in the same phase are expressed as being almost overlapping.

[0036] As described above, according to the configuration of this embodiment, it is possible to obtain a natural-looking photographed image while obtaining a good bokeh effect. (Second Example) In the first embodiment, the phase of the blade members 104 arranged for each optical system is the same. However, even if the light striations generated by each optical system are not in the same phase, as long as the light striations are generated at equal intervals, it is possible to obtain an image that does not look strange when the captured images are superimposed and checked using a VR video capture device or the like. Note that "equal intervals" does not only mean strictly equal intervals, but also includes substantially equal intervals (approximately equal intervals).

[0037] In this embodiment, we will explain how the phases of the blade members 104 arranged for each optical system need to be shifted to make the spacing between the light striations equal. Note that in this embodiment, only the configuration that differs from the first embodiment will be explained, and a description of the common configuration will be omitted.

[0038] Figure 9 shows an example of striations that occur when the aperture shape is an odd polygon. Figure 9(a) shows striations that occur in each optical system. When the aperture shape is an odd polygon, even if the phase of the aperture is shifted, the phase of the generated striations will be the same as long as the phase shift angle [degrees] of the blade member 104 is the value calculated by the following formula (1).

[0039] Phase shift angle = (360 × m) / (number of blade members 104 × 2) (1) Here, m is a positive integer.

[0040] Figure 9(a) shows the shape of the aperture and the striations when the aperture is pentagonal and the phase shift angle is 36 degrees. Figure 9(b) is a diagram showing how the striations shown in Figure 9(a) appear when the captured image is superimposed and confirmed using a VR video capture device or the like. As shown in Figure 9(b), the phases of the striations occurring in the same phase are expressed as almost overlapping.

[0041] Fig. 10 shows an example of streaks of light that appear when the opening is an even polygon. Fig. 10(a) shows streaks of light when the opening is a hexagon and the phase shift angle is 30 degrees. Fig. 10(b) shows how the streaks of light shown in Fig. 10(a) appear when the captured image is superimposed and viewed using a VR video capture device or the like. As shown in Fig. 10(b), the streaks of light appear to overlap and appear to be occurring at equal intervals.

[0042] 11A and 11B show other examples of striations that occur when the aperture shape is an odd polygon. Fig. 11A shows striations that occur in each optical system when the phase shift angle [degrees] of the blade member 104 is the value calculated by the following formula (2).

[0043] Phase shift angle=(360×m) / (number of blade members 104×4) Here, m is a positive integer.

[0044] In Figure 11(a), the shape of the opening is pentagonal, and the phase shift angle is 18 degrees. Figure 11(b) shows how the light striations shown in Figure 11(a) appear when the captured image is superimposed and viewed using a VR video capture device or the like. As shown in Figure 11(b), the light striations appear overlapping and appear to be occurring at equal intervals.

[0045] It is desirable that the deviation (angle deviation, phase deviation) of the interval between adjacent light striations (angle between phases) from the design value be less than 5 degrees.

[0046] As described above, according to the configuration of this embodiment, it is possible to obtain a natural-looking photographed image while obtaining a good blur effect. (Third Example) In order to minimize differences in characteristics such as aperture diameter accuracy in each optical system, it is desirable that the first and second aperture drive rings 120, 121 be made of the same material. However, when there is only one light intensity adjustment drive unit 105, the assembly phases of the first and second ring gears 120b, 121b relative to the pinion gear 106 are different, making it difficult to align the phases of the multiple blade members 104. In this embodiment, a configuration for solving this problem will be described. Note that in this embodiment, only configurations that differ from the first embodiment will be described, and a description of common configurations will be omitted.

[0047] FIG. 12 is an explanatory diagram of the configuration of the light intensity adjustment device 100 of this embodiment. FIG. 12(a) shows the light intensity adjustment device 100 in an open state, and FIG. 12(b) shows the light intensity adjustment device 100 in a closed state. The first and second aperture drive rings 120 and 121 are made of the same material. The first and second ring gears 120b and 121b provided on the first and second aperture drive rings 120 and 121 have gear teeth formed over a wider range than the meshing range with the pinion gear 106 required for wide-open to small aperture settings. Because the first and second aperture drive rings 120 and 121 are made of the same material, the gear phases of the first and second ring gears 120b and 121b meshing with the pinion gear 106 and the assembled positions of the respective blade members 104 are the same. Furthermore, because the first and second aperture drive rings 120 and 121 are made of the same material, the amount of rotation required for the same light intensity adjustment is the same.

[0048] At least one of the first and second aperture drive rings 120, 121 meshes the first and second ring gears 120b, 121b with the pinion gear 106 so as to reduce the phase shift of the blade members 104. Because the first and second aperture drive rings 120, 121 are made of the same component, the first and second ring gears 120b, 121b mesh with the pinion gear 106, and their gear usage ranges when adjusting the light intensity are different. In this embodiment, the first aperture drive ring 120 has a first drive range used for aperture changes from full aperture to small aperture, and the second aperture drive ring 121 has a second drive range used for aperture changes from full aperture to small aperture, which meshes with the second aperture drive ring 121 to adjust the phase shift of the blade members 104. This allows the phase shift of the blade members 104 to be adjusted to a substantially desired state, even though the first and second aperture drive rings 120, 121 are made of the same component.

[0049] As described above, according to the configuration of this embodiment, it is possible to obtain a natural-looking photographed image while obtaining a good blur effect. (Fourth Example) In the configuration described in the third embodiment, the meshing angle of the pinion gears 106 of the first and second ring gears 120b, 121b can only be adjusted in increments of one gear tooth, which can result in misalignment of the phases of the blade members 104. In this embodiment, a configuration for solving this problem will be described. Note that in this embodiment, only the configuration that differs from the third embodiment will be described, and a description of the common configuration will be omitted.

[0050] FIG. 13 illustrates the configuration of the light intensity adjustment device 100 of this embodiment. FIG. 13(a) shows the light intensity adjustment device 100 in an open state, and FIG. 13(b) shows the light intensity adjustment device 100 in a stopped-down state. The first and second aperture drive rings 120 and 121 are the same member. The first aperture drive ring 120 is provided with a third ring gear (third transmission unit) 120d that is formed at a different circumferential phase from the first ring gear 120b. The second aperture drive ring 121 is provided with a fourth ring gear (fourth transmission unit) 121d that is formed at a different circumferential phase from the second ring gear 121b. The third and fourth ring gears 120d and 121d are arranged so that the phases of the blade members 104 for each optical system are the same when the first and fourth ring gears 120b and 121d mesh with the pinion gear 106. One of the first and second aperture drive rings 120, 121 meshes the first and second ring gears 120b, 121b with the pinion gear 106 so as to reduce the phase shift of the blade members 104. This allows the phase shift of the respective blade members 104 to be adjusted to a desired state even if the first and second aperture drive rings 120, 121 are the same member.

[0051] As described above, according to the configuration of this embodiment, it is possible to obtain a natural-looking photographed image while obtaining a good blur effect.

[0052] The disclosure of this embodiment includes the following configuration. (Configuration 1) A light amount adjusting device for adjusting the light amount of a first optical system and a second optical system, First and second openings for transmitting light; a drive unit that drives the blade member; a first opening / closing unit that is configured with three or more blade members and that opens and closes at least a portion of the first opening in response to driving of the driving unit; a second opening / closing unit that is configured by the same number of blade members as the blade members that configure the first opening / closing unit and that opens and closes at least a portion of the second opening in response to driving of the drive unit, A light intensity adjustment device characterized in that the first opening / closing unit and the second opening / closing unit are arranged so that when images obtained by photographing using each of the first and second optical systems are superimposed, the spacing between light striations generated when light passes through the openings formed by each of the first and second opening / closing units is equal. (Configuration 2) The light amount adjusting device according to configuration 1, wherein the first and second opening / closing sections are arranged so that the corresponding blade members are in phase with each other. (Configuration 3) When the number of the blade members constituting each of the first and second opening / closing units is odd, the first and second opening / closing units are arranged such that the phases of the positions of the corresponding blade members are shifted by (360 × m) / (number of the blade members constituting each opening / closing unit × 4) [degrees] (m: positive integer), The light intensity adjustment device described in configuration 1, characterized in that when the number of blade members constituting each of the first and second opening / closing sections is even, the first and second opening / closing sections are arranged so that the phase of the positions of the corresponding blade members is shifted by (360 x m) / (number of blade members constituting each opening / closing section x 2) [degrees] (m: positive integer). (Configuration 4) 4. The light intensity adjusting device according to any one of configurations 1 to 3, wherein the spacing between the light striations deviates from a design value by less than 5 degrees. (Configuration 5) a transmission member that transmits a driving force from the drive unit; a first drive member rotatably fitted in the first opening; a second drive member rotatably fitted in the second opening, the first driving member includes a first transmission part for receiving the driving force via the transmission member, and rotates in response to driving of the driving part; the second driving member includes a second transmission part for receiving the driving force via the transmission member, and rotates in response to driving of the driving part; the blade members constituting the first opening / closing unit are uniformly arranged radially about the rotation axis center of the first driving member, The light amount adjusting device according to any one of configurations 1 to 4, wherein the blade members constituting the second opening / closing portion are arranged radially and evenly about the center of the rotation axis of the second drive member. (Configuration 6) The light amount adjusting device according to configuration 5, wherein a gap allowing the blade members to rotate is formed on the opposing side of the first and second drive members with the blade members sandwiched therebetween. (Configuration 7) the first and second drive members are the same member, The light intensity adjusting device of configuration 5 or 6, characterized in that the area of ​​the first transmission part used for rotating the first drive member is different from the area of ​​the second transmission part used for rotating the second drive member. (Configuration 8) the first driving member includes a third transmission part that is provided at a different phase from the first transmission part and that receives the driving force via the transmission member; the second driving member includes a fourth transmission part that is provided at a different phase from the second transmission part and that receives the driving force via the transmission member; the first and second drive members are the same member, 8. The light amount adjusting device according to any one of configurations 5 to 7, wherein the first and second driving members receive the driving force via the first and fourth transmission parts, respectively. (Configuration 9) the first opening is disposed around the optical axis of the first optical system; the second opening is disposed about the optical axis of the second optical system, a base member that holds the drive unit and has first and second openings; a pressing member fixed to the base member, The blade member includes a first engagement portion that serves as a rotation center and a second engagement portion for rotating the blade member, the first engagement portion engages with a hole formed in one of the first and second drive members and the presser member; The light amount adjusting device according to any one of configurations 5 to 8, wherein the second engaging portion engages with a cam shape formed on the other of the first and second driving members and the pressing member. (Configuration 10) the relative phase between the pressing member and the first driving member is adjusted, and the blade members constituting the first opening / closing unit are rotated, thereby adjusting the amount of light of the first optical system, A light intensity adjustment device described in any one of the configurations of configuration 9, characterized in that the relative phase between the pressing member and the second drive member is adjusted, and the blade member constituting the second opening / closing portion rotates to adjust the light intensity of the second optical system. (Configuration 11) the first opening is disposed around the optical axis of the first optical system; the second opening is disposed about the optical axis of the second optical system, 11. The light amount adjusting device according to any one of configurations 1 to 10, further comprising a base member that holds the drive unit and has first and second openings formed therein. (Configuration 12) A light amount adjusting device according to any one of configurations 1 to 10; A lens device comprising: a first optical system and a second optical system. (Configuration 13) A light amount adjusting device according to any one of configurations 1 to 10; an imaging element that photoelectrically converts an optical image formed by at least one of the first and second optical systems;

[0053] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0054] 2 First optical system 3 Second optical system 100 Light intensity adjustment device 101a 1st opening 101b 2nd opening 104 Blade member 105 Light intensity adjustment drive unit (drive unit)

Claims

1. A light amount adjusting device for adjusting the light amount of a first optical system and a second optical system, first and second openings for allowing light to pass therethrough; a drive unit that drives the blade member; a first opening / closing unit configured with three or more blade members and configured to open and close at least a portion of the first opening in response to driving of the driving unit; a second opening / closing unit that is configured by the same number of blade members as the blade members that configure the first opening / closing unit and that opens and closes at least a portion of the second opening in response to driving of the drive unit, A light intensity adjustment device characterized in that the first opening / closing unit and the second opening / closing unit are arranged so that when images obtained by photographing using each of the first and second optical systems are superimposed, the spacing between light striations generated when light passes through the openings formed by each of the first and second opening / closing units is equal.

2. 2. The light amount adjusting device according to claim 1, wherein the first and second opening / closing portions are arranged such that the corresponding blade members are in phase with each other.

3. When the number of the blade members constituting each of the first and second opening / closing units is odd, the first and second opening / closing units are arranged such that the phases of the positions of the corresponding blade members are shifted by (360 × m) / (the number of the blade members constituting each opening / closing unit × 4) [degrees] (m: positive integer), The light intensity adjustment device of claim 1, characterized in that when the number of blade members constituting each of the first and second opening / closing sections is even, the first and second opening / closing sections are arranged so that the phase of the positions of the corresponding blade members is shifted by (360 x m) / (number of blade members constituting each opening / closing section x 2) [degrees] (m: positive integer).

4. 4. The light amount adjusting device according to claim 1, wherein the deviation of the interval between the light striations from a design value is less than 5 degrees.

5. a transmission member that transmits a driving force from the drive unit; a first drive member rotatably fitted in the first opening; a second drive member rotatably fitted in the second opening, the first driving member includes a first transmission part for receiving the driving force via the transmission member, and rotates in response to driving of the driving part; the second driving member includes a second transmission part for receiving the driving force via the transmission member, and rotates in response to driving of the driving part; the blade members constituting the first opening / closing unit are uniformly arranged radially about the center of the rotation axis of the first driving member, 4. The light amount adjusting device according to claim 1, wherein the blade members constituting the second opening / closing portion are arranged radially and evenly about the center of the rotation axis of the second driving member.

6. 6. The light amount adjusting device according to claim 5, wherein a gap allowing the blade members to rotate is formed on the opposing side of the first and second drive members with the blade members interposed therebetween.

7. the first and second drive members are the same member, The light amount adjusting device according to claim 5, wherein the area of ​​the first transmission part used for rotating the first driving member is different from the area of ​​the second transmission part used for rotating the second driving member.

8. the first driving member includes a third transmission part that is provided at a different phase from the first transmission part and that receives the driving force via the transmission member, the second driving member includes a fourth transmission part that is provided at a different phase from the second transmission part and that receives the driving force via the transmission member, the first and second drive members are the same member, 6. The light amount adjusting device according to claim 5, wherein the first and second driving members receive the driving force via the first and fourth transmission parts, respectively.

9. the first opening is disposed around the optical axis of the first optical system; the second opening is disposed about the optical axis of the second optical system, a base member that holds the drive unit and has first and second openings; a pressing member fixed to the base member, The blade member includes a first engagement portion that serves as a rotation center and a second engagement portion for rotating the blade member, the first engaging portion engages with a hole formed in one of the first and second driving members and the pressing member, 6. The light amount adjusting device according to claim 5, wherein the second engaging portion engages with a cam shape formed on the other of the first and second driving members and the pressing member.

10. a relative phase between the pressing member and the first driving member is adjusted, and the blade members constituting the first opening / closing unit are rotated, thereby adjusting the amount of light of the first optical system; The light amount adjusting device according to claim 9, characterized in that the relative phase between the pressing member and the second driving member is adjusted, and the blade member constituting the second opening / closing portion is rotated to adjust the light amount of the second optical system.

11. the first opening is disposed around the optical axis of the first optical system; the second opening is disposed about the optical axis of the second optical system, 4. The light amount adjusting device according to claim 1, further comprising a base member that holds the drive unit and has first and second openings formed therein.

12. A light amount adjusting device according to any one of claims 1 to 3; a first optical system and a second optical system;

13. A light amount adjusting device according to any one of claims 1 to 3; an image sensor that photoelectrically converts an optical image formed by at least one of the first and second optical systems.

Images