Lens device and imaging device

Abstract

To provide a lens device for stereography that appropriately arranges a circuit board to improve space efficiency.SOLUTION: A lens device (200) has a first optical system (201R), a second optical system (201L), a lens mount (202) to be attached to a camera body, and a circuit board (310) for communicating with the camera body. The first optical system and the second optical system are an inflection optical system having a first reflection surface (220) and a second reflection surface (230), and have, in order from an object side, first optical axes (OA1R, OA1L), second optical axes (OA2R, OA2L) of light reflected on the first reflection surfaces, and third optical axes (OA3R, OA3L) of light reflected on the second reflection surfaces. When seen from an axial direction of the lens mount, at least part of an electrical element (310A) arranged on the circuit board is arranged inside the diameter of the lens mount.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lens apparatus and an imaging apparatus. [Background technology]

[0002] Conventionally, interchangeable lenses for stereoscopic photography have been known as lens devices. For example, Patent Documents 1 and 2 disclose lens devices in which two optical systems are arranged in parallel and two image circles are formed in parallel on one imaging element. The lens device disclosed in Patent Document 2 also has a doughnut-shaped or C-shaped circuit board arranged near the lens mount for electrical communication with the camera body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-3022 A [Patent Document 2] Japanese Patent Application Publication No. 1-296205 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the lens device disclosed in Patent Document 1, two single-axis optical systems are arranged within a range in which the imaging sensor can capture two images. Therefore, if a doughnut-shaped or C-shaped circuit board is arranged near the lens mount as in Patent Document 2, it is difficult to ensure a sufficient baseline length that does not cause discomfort when viewing VR. In addition, doughnut-shaped or C-shaped circuit boards are not space-efficient, as the wiring becomes complicated.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a lens device and an imaging device for stereoscopic photography in which a circuit board is appropriately arranged to improve space efficiency. [Means for solving the problem]

[0006] A lens device according to one aspect of the present invention includes a first optical system, a second optical system, a lens mount for mounting on a camera body, and a circuit board for communicating with the camera body. a base member to which the first optical system, the second optical system, and the circuit board are attached; wherein the first optical system and the second optical system are bending optical systems having a first reflecting surface and a second reflecting surface, and have, in order from the object side, a first optical axis, a second optical axis of light reflected by the first reflecting surface, and a third optical axis of light reflected by the second reflecting surface, and when viewed from an axial direction of the lens mount, at least a part of an electric element arranged on the circuit board is arranged inside a diameter of the lens mount. the first optical system, the second optical system, and the circuit board are movable in a first optical axis direction relative to the lens mount, integrally with the base member. .

[0007] Other objects and features of the present invention will be described in the following embodiments. Effect of the Invention

[0008] According to the present invention, it is possible to provide a lens device and an imaging device for stereoscopic photography in which the circuit board is appropriately arranged to improve space efficiency. [Brief description of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view of a lens device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of the lens device according to the embodiment. [Diagram 3] FIG. 2 is an exploded perspective view of the lens device according to the embodiment. [Figure 4] FIG. 2 is a front view of the lens device according to the embodiment. [Diagram 5] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 6] FIG. 5 is a cross-sectional view taken along line AA in FIG. 4 as a modified example. [Figure 7] 5 is a cross-sectional view taken along line BB in FIG. 4. [Figure 8] FIG. 2 is a diagram showing the arrangement of optical axes and an image circle on an image sensor in this embodiment. [Figure 9]4A and 4B are diagrams illustrating reflections of a second optical system when an image is captured by a first optical system in this embodiment. [Figure 10] 1 is a schematic configuration diagram of an imaging device according to an embodiment of the present invention. [Figure 11] 2 is a front view showing a state in which a front exterior member and a cover member are removed from the lens device in the present embodiment. FIG. [Figure 12] FIG. 2 is a perspective view of a main part of the lens device according to the embodiment. [Figure 13] 4 is a cross-sectional view showing a path of a flexible substrate in the present embodiment. FIG. [Figure 14] FIG. 13 is a front view of a lens device as a modified example of the embodiment. [Figure 15] FIG. 11 is a cross-sectional view of a lens device as a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0011] The lens device (interchangeable lens) of this embodiment has two optical systems (a first optical system and a second optical system) arranged in parallel (symmetrically) to each other, and is configured to form two image circles in parallel on one image sensor. The two optical systems are arranged horizontally at a predetermined distance (baseline length). When viewed from the image side, an image formed by the right optical system (the first optical system) is recorded as a video or still image for the right eye, and an image formed by the left optical system (the second optical system) is recorded as a video or still image for the left eye. When playing back a video or still image (image), the viewer can view it using a known 3D display or so-called VR goggles, so that an image for the right eye is projected on the viewer's right eye, and an image for the left eye is projected on the viewer's left eye. At this time, an image with parallax is projected on the right eye and the left eye due to the base line length of the lens device, so that the viewer can get a three-dimensional feeling. In this manner, the lens device of this embodiment is a lens device for stereoscopic imaging that is capable of forming two images with parallax on an imaging element (one imaging surface) by means of the first optical system and the second optical system.

[0012] First, an exchange lens (lens device) 200 will be described with reference to Figs. 1 to 3. Fig. 1 is a cross-sectional view of the exchange lens 200, showing a schematic configuration of a right-eye optical system 201R and a left-eye optical system 201L. Figs. 2 and 3 are exploded perspective views of the exchange lens 200. In the following description, the right-eye optical system will be described with a suffix R, and the left-eye optical system will be described with a suffix L. Descriptions common to both the right-eye optical system and the left-eye optical system will not be described with a suffix R or L.

[0013] The interchangeable lens 200 has a right-eye optical system (first optical system) 201R and a left-eye optical system (second optical system) 201L. The right-eye optical system 201R and the left-eye optical system 201L are each capable of photographing at an angle of view of 180 degrees or more. In each optical system, a first optical axis OA1 (OA1R, OA1L), a second optical axis OA2 (OA2R, OA2L) substantially perpendicular to the first optical axis, and a third optical axis OA3 (OA3R, OA3L) parallel to the first optical axis are set in order from the subject side (object side). Each optical system has, along each optical axis, a first lens (first lens) 211 having a surface 211A with a convex shape on the subject side on the first optical axis OA1, a second lens 221 on the second optical axis OA2, and a third lens 231, 231-2 on the third optical axis OA3. Each optical system is a bending optical system having a first prism (first reflecting surface) 220 that bends the light flux of the first optical axis OA1 to the second optical axis OA2, and a second prism (second reflecting surface) 230 that bends the light flux of the second optical axis OA2 to the third optical axis OA3. Hereinafter, the optical axis direction is the direction extending from the subject side toward the imaging surface side, and corresponds to the direction of the first optical axis OA1 (first optical axis direction).

[0014] The right eye optical system 201R and the left eye optical system 201L are fixed to the lens top base 300 by screw tightening or the like. The lens top base 300 is fixed to the lens bottom base 301 by screw tightening or the like. The lens top base 300 and the lens bottom base 301 constitute a base member to which the right eye optical system 201R, the left eye optical system 201L, and the circuit board 310 are attached. The right eye optical system 201R, the left eye optical system 201L, and the circuit board 310 are movable in the first optical axis direction relative to the lens mount 202, integrally with the base member. The lens bottom base 301 is held so as to be able to advance and retreat in the optical axis direction while movement in the rotation direction is restricted by a linear structure (not shown). As a result, the right eye optical system 201R and the left eye optical system 201L are able to advance and retreat in the optical axis direction integrally, and the focus positions of the right eye optical system 201R and the left eye optical system 201L can be adjusted simultaneously.

[0015] Next, the structure of the first lens 211 and its surroundings will be described with reference to Fig. 4 to Fig. 7. Fig. 4 is a front view of the interchangeable lens 200. Figs. 5 and 6 are cross-sectional views taken along line AA in Fig. 4, and show the structure of the first lens 211 and its surroundings of the interchangeable lens 200. Fig. 7 is a cross-sectional view taken along line BB in Fig. 4, and shows the structure of the first lens 211 and its surroundings of the interchangeable lens 200.

[0016] The interchangeable lens 200 includes an exterior cover member 203 that houses the right-eye optical system 201R and the left-eye optical system 201L, and a front exterior member 204 can be used to store the front side of the interchangeable lens 200 in a lid-like manner, and the front exterior member 204 is fixed by screws to the exterior cover member 203. The front exterior member 204 has openings 204F into which the first lens 211R of the right-eye optical system 201R and the first lens 211L of the left-eye optical system 201L each fit.

[0017] The front exterior member 204 has a shape that does not block the effective light beam of the right-eye optical system 201R and the left-eye optical system 201L having an effective angle of view of 180 degrees or more. The first lenses 211R and 211L have a lens surface 211A that is an incidence surface of the effective light beam on the subject side. When the lens surface 211A of the first lens 211 is an effective incidence surface 211B inside the effective incidence surface outer diameter 211C, the 180-degree light beam extends horizontally in a direction approximately perpendicular to the effective incidence surface 211B of the first lens 211 and the optical axis. The light beam that exceeds 180 degrees is located closer to the imaging surface than the effective incidence surface 211B of the first lens 211, and extends further toward the imaging surface as it moves away from the first lens 211. Therefore, in order not to block the light beam that exceeds 180 degrees, the surface shape of the front exterior member 204 is arranged closer to the imaging surface than the effective incidence surface 211B of the first lens 211. Similarly, the cover member 213 is disposed closer to the imaging surface side than the effective incidence surface B.

[0018] The first lens 211 and its surrounding structure will be described in detail with reference to Fig. 4 and Fig. 7. As shown in Fig. 4, the right-eye optical system 201R side of the center point O between the right-eye optical system 201R and the left-eye optical system 201L is the right-eye region 20R, and the left-eye optical system 201L side of the center point O is the left-eye region 20L. At this time, as shown in the field of view FOV in Fig. 7, the right-eye region 20R of the front exterior member 204 has a surface shape 204A that is concave toward the imaging surface side as it is away from the first lens 211L so as not to block the outermost effective light beam (thick dotted line portion in Fig. 7) of the left-eye optical system 201L. Similarly, the left-eye region 20L of the front exterior member 204 has a surface shape 204B that is concave toward the imaging surface side as it is away from the first lens 211R of the right-eye optical system 201R so as not to block the effective light beam of the right-eye optical system 201R. However, the first lens 211L of the left eye optical system 201L and its periphery as seen from the right eye optical system 201R, and the first lens 211R of the right eye optical system 201R and its periphery as seen from the left eye optical system 201L have areas that block part of each other's effective light beams.

[0019] In order to form the opening 204F of the front exterior member 204, the front exterior member 204 has wall shapes 204C and 204D that are more convex than the surface shapes 204A and 204B. The wall shape 204C is an arc shape that is approximately coaxial with the first lens 211R of the right eye optical system 201R and does not block the effective light beam of the right eye optical system 201R, but blocks a part of the effective light beam of the left eye optical system 201L. Similarly, the wall shape 204D is an arc shape that is approximately coaxial with the first lens 211L of the left eye optical system 201L and does not block the effective light beam of the left eye optical system 201L, but blocks a part of the effective light beam of the right eye optical system 201R.

[0020] Next, a description will be given of the first group lenses 211R, 211L that fit into the opening 204F of the front exterior member 204 and the configuration around them. As shown in Fig. 5, a first group lens holding member (first lens holding member) 212 that holds the first group lenses 211R, 211L is provided. In addition, a cover member 213 having an opening 213A into which the first group lenses 211R, 211L fit is arranged so as to cover the outer periphery of the subject-side lens surface 211A of the first group lenses 211R, 211L.

[0021] A boundary 211D with the lens surface 211A exists on the outer periphery side of the effective incidence surface outer diameter 211C of the first lens 211. The boundary 211D is a boundary between the side surface 211E of the first lens 211R, 211L and the lens surface 211A. Alternatively, it may be an inner diameter tip portion of a crimp claw shape that crimps and fixes the first lens 211R, 211L as shown in FIG. 6. The boundary 211D is a boundary between the lens surface 211A and other surfaces or members. The cover member 213 covers this boundary 211D. In other words, the inner diameter of the opening 213A of the cover member 213 is smaller than the diameter of the boundary 211D.

[0022] When the inner diameter of the opening 213A of the cover member 213 is ΦA and the diameter of the boundary 211D is ΦB, the overlap amount X on one side is expressed by the following formula (1).

[0023] X = (ΦB - ΦA) / 2 … (1) By covering and concealing boundary 211D in this manner, improvement in the appearance quality is expected.

[0024] The cover member 213 is positioned in the optical axis direction with respect to the first lens holding member 212, and is provided with a predetermined play Y in a direction perpendicular to the optical axis. Since the predetermined play Y is smaller than the overlap amount X of the cover member 213, the boundary 211C will not come to the inside of the opening 213A of the cover member 213 even if it moves toward the cover member 213 due to the play.

[0025] As shown in FIG. 5 and FIG. 6, a groove 213B is formed on a part of the inner circumference of the cover member 213. A wing shape 212A extending to the outer circumference side is formed on a part of the outer circumference of the first lens holding member 212. The groove 213B and the wing shape 212A are assembled at a position where they do not overlap when viewed from the optical axis direction at a certain phase, and the cover member 213 is rotated so that the wing shape 212A fits into the groove 213B. By forming a bayonet structure in this way, it is possible to position the cover member 213 in the optical axis direction. At this time, a predetermined play Y is provided between the inner circumference of the cover member 213 and the outer circumference of the first lens holding member 212. However, the position regulation structure in the optical axis direction is not limited to this. For example, the first lens holding member 212 may have a groove shape and the cover member 213 may have a wing shape.

[0026] In this way, the cover member 213 is positioned in the optical axis direction with respect to the first lens group holding member 212, and therefore can advance and retreat in the optical axis direction integrally with the first lens group holding member 212. The outer diameter of the cover member 213 fits radially into the inner diameter of the opening 204F of the front exterior member 204. At this time, play in the radial fit is minute and smaller than the predetermined play Y.

[0027] Furthermore, the cover member 213 is provided with a rotation restriction key 213C, and the front exterior member 204 is provided with a rotation restriction groove 204E corresponding to the rotation restriction key 213C. With this, when the front exterior member 204 is assembled, the rotation restriction key 213C of the cover member 213 fits into the rotation restriction groove 204E of the front exterior member 204, thereby restricting the rotation of the cover member 213. As a result, the above-mentioned bayonet configuration can prevent the cover member 213 from rotating and coming off the first lens group holding member 212. Here, the relationship of the rotation restriction structure may be reversed, and the rotation restriction groove may be provided in the cover member 213, and the rotation restriction key may be provided in the front exterior member 204.

[0028] The cover member 213 has a surface 213D facing the image plane side, and the first lens holding member 212 has a surface 212B facing the subject side opposite surface 213D. An optical axis direction seal member 214 for waterproof and dustproofing is arranged so as to be sandwiched between surfaces 213D and 212B. It is preferable that surfaces 213D and 212B are the entire circumference, but it may be only a part of the circumference. By sandwiching the optical axis direction seal member 214 in the optical axis direction, the cover member 213 and the first lens holding member 212 are biased in the optical axis direction, and rattle in the optical axis direction can be reduced.

[0029] Also, in order to maintain a predetermined backlash Y, the optical axis direction seal member 214 is disposed with a predetermined clearance larger than the backlash Y so as not to be pinched in a direction perpendicular to the optical axis direction. The optical axis direction seal member 214 is made of an elastically deformable material such as rubber or sponge, and can absorb the backlash Y of the cover member 213 relative to the first group range holding member 212 in the direction perpendicular to the optical axis direction.

[0030] A radial seal member 215 for splash-proof and dust-proof purposes is disposed between the cover member 213 and the opening 204F so as to be sandwiched in a direction perpendicular to the optical axis. The radial seal member 215 on the right eye optical system 201R side is disposed at a position to block the effective light beam of the left eye optical system 201L, and the radial seal member 215 on the left eye optical system 201L side is disposed at a position to block the effective light beam of the right eye optical system 201R.

[0031] The above configuration makes it possible to capture a stereoscopic image with a viewing angle of 180 degrees or more, while maintaining the appearance quality and dust-proof and drip-proof performance. By adopting a structure in which the first lens holding member 212 is not directly fitted to the opening 204F of the front exterior member 204, even if the first lens holding member 212 is misaligned due to the influence of manufacturing errors or the like, the position is not forced. Therefore, the optical performance and the relative error between the right eye optical system 201R and the left eye optical system 201L do not change by incorporating the front exterior member 204.

[0032] FIG. 8 is a diagram showing the position of each optical axis and mount of the interchangeable lens 200, and the positional relationship of the image circles on the imaging element on the camera body side. On the imaging element 111 of the camera body 110, a right-eye image circle ICR with an effective angle of view formed by the right-eye optical system 201R and a left-eye image circle ICL with an effective angle of view formed by the left-eye optical system 201L form images in parallel. It is preferable to set the size ΦD2 of the image circles and the distance between the image circles so that the image circles do not overlap as much as possible. For example, it is preferable to consider an area in which the light receiving range of the imaging element 111 is divided into left and right halves at the center, and set it so that the center of the right-eye image circle ICR is located approximately in the center of the right area of ​​the light receiving range, and the center of the left-eye image circle ICL is located approximately in the center of the left area of ​​the light receiving range.

[0033] The optical system of this embodiment is a full-circle fisheye lens, and the image formed on the imaging surface is a circular image that covers a range of an angle of view exceeding 180 degrees, with two circular images formed on the left and right sides as shown in Fig. 8. The distance between the first optical axis OA1R of the right-eye optical system 201R and the first optical axis OA1L of the left-eye optical system 201L is called the base length L1. The longer the base length L1, the greater the stereoscopic effect when viewed.

[0034] For example, the sensor size is 24 mm long x 36 mm wide, the diameter of the image circle is Φ17 mm, the distance L2 between the third optical axes is 18 mm, and the length of the second optical axis is 21 mm. When the optical systems are arranged so that the second optical axis extends horizontally, the base length L1 shown in FIG. 1 is 60 mm, which is approximately equal to the interpupillary distance of an adult. In addition, the diameter ΦD of the lens mount 202 (the fitting diameter of the lens mount 202 with the camera body 110) may be shorter than the base length L1. In addition, the distance L2 between the third optical axes is shorter than the diameter ΦD of the lens mount 202. This makes it possible to arrange the third group lenses 231 and 231-2 on the third optical axis inside the lens mount 202. That is, the relationship of the following formula (2) is satisfied.

[0035] L1>ΦD>L2 … (2) When viewing in VR, it is said that the angle of view that provides a three-dimensional effect is about 120 degrees, but since a field of view of 120 degrees leaves a sense of discomfort, the angle of view is often widened to 180 degrees. In this embodiment, since the effective angle of view exceeds 180 degrees, the size ΦD3 of the image circle in the range of 180 degrees satisfies the relationship of the following formula (3).

[0036] ΦD2>ΦD3 … (3) FIG. 9 is a diagram showing the reflection of the second optical system when imaging is performed with the first optical system. The wall shape 204C(D) of the front exterior member 204 is imaged inside the size ΦD2 which is the effective angle of view, but is not imaged at the 180-degree angle of view and is imaged outside the size ΦD3. Therefore, when viewing as VR, there is no effect when viewing at the 180-degree angle of view. For example, within the effective angle of view of the right eye optical system 201R, there are the first lens 211L of the left eye optical system 201L in the left eye region 20L, the cover member 213, and the wall portion 204D of the front exterior member 204, which are reflected in the actual effective imaging range as shown in FIG. 9. Only the first lens 211L is reflected within the image circle of the 180-degree angle of view (inside ΦD3), but the other cover members 213 and wall portions 204D are outside the image circle of the 180-degree angle of view.

[0037] In addition, the reflection of the wall 204D is captured outside (left side in FIG. 9) from the apex of the first lens 211L even when viewed in the horizontal direction. In the fisheye circular image, the fact that the image is captured outside from the apex of the first lens 211L even when viewed in the horizontal direction is an advantage when cutting the reflection of the adjacent lens by trimming during image processing or image editing. In this case, the reflection of the wall 204D does not affect the image as long as the apex of the first lens 211L, which is necessarily reflected due to the specifications, is cut in the horizontal direction, for example, by cutting the outside of the line Z in the horizontal direction from the line Z shown in FIG. 9, so that the minimum cut is sufficient. The same applies to the reflection of the first optical system when the image is captured by the second optical system. As described above, although the wall 204D is within the effective angle of view, it is arranged so as to have almost no effect on the image capture for actual VR use.

[0038] Fig. 10 is a diagram showing an example of a schematic configuration of an imaging device 100 capable of capturing a stereoscopic image. In Fig. 10, the imaging device 100 has a camera body 110 and an interchangeable lens 200. The interchangeable lens 200 is detachable from the camera body 110. In this embodiment, the imaging device 100 is an imaging system having the camera body 110 and the interchangeable lens (lens device) 200 that is detachable from the camera body 110. However, this embodiment is not limited to this, and can also be applied to an imaging device in which the camera body and the lens device are integrally configured.

[0039] The interchangeable lens 200 has a right-eye optical system 201R, a left-eye optical system 201L, and a lens system control unit 209. The camera body 110 has an image sensor 111, an A / D converter 112, an image processing unit 113, a display unit 114, an operation unit 115, a storage unit 116, a body system control unit 117, and a camera mount 122. When the lens device 200 is attached to the camera mount 122 of the camera body 110 via the lens mount 202, the body system control unit 117 and the lens system control unit 209 are electrically connected.

[0040] The image of the subject is formed on the imaging element 111 in the form of a right-eye image formed via the right-eye optical system 201R and a left-eye image formed via the left-eye optical system 201L, arranged side by side. That is, the imaging element 111 simultaneously captures two images with parallax formed by the right-eye optical system 201R and the left-eye optical system 201L. The imaging element 111 converts the formed image of the subject (optical signal) into an analog electrical signal. The A / D converter 112 converts the analog electrical signal output from the imaging element 111 into a digital electrical signal (image signal). The image processing unit 113 performs various image processing on the digital electrical signal (image signal) output from the A / D converter 112.

[0041] The display unit 114 displays various information. The display unit 114 is realized, for example, by using an electronic viewfinder or a liquid crystal panel. The operation unit 115 has a function as a user interface for the user to give instructions to the imaging device 100. If the display unit 114 has a touch panel, the touch panel also becomes one of the operation unit 115. The storage unit 116 stores various data such as image data that has been image-processed by the image processing unit 113. The storage unit 116 also stores programs. The storage unit 116 is realized, for example, by using a ROM, a RAM, and a HDD. The main body system control unit 117 controls the entire imaging device 100. The main body system control unit 117 is realized, for example, by using a CPU.

[0042] The interchangeable lens 200 includes a lens system control unit 209 for communicating with the camera body 110, and is disposed inside the interchangeable lens 200 as a circuit board 310, as shown in Figures 1 and 11. An aperture device (electronic component) 240 is disposed in each of the right-eye optical system 201R and the left-eye optical system 201L, as shown in Figure 1, and a desired aperture diameter can be set by electronically controlling a drive source 320 such as a stepping motor (see Figures 12(A) and (B)).

[0043] As shown in FIG. 1 and FIG. 11, the lens top base 300 is provided with a circuit board 310 for electronically controlling the aperture device 240. As shown in FIG. 12(A) and (B), the circuit board 310 includes a plurality of electric elements 310A for communication with the camera body 110 and control of electronic components, and is electrically connected by wiring. The circuit board 310 also includes a flexible board (second flexible board) 330A for communication with the electronic components to be controlled. The flexible board 330A is electrically connected to the aperture device 240 and a driving source 320 such as a stepping motor. The circuit board 310 is provided with a connector (second connector) 310B for electrically connecting the flexible board 330A. The connector 310B is arranged point-symmetrically around the axis of the lens mount 202.

[0044] Also, a flexible substrate (first flexible substrate) 330B is provided to communicate with the camera body 110. The flexible substrate 330B is electrically connected to an electrical contact portion (communication portion) 202A arranged on the lens mount 202 to communicate with the camera body 110. Also, a connector (first connector) 310C that electrically connects the flexible substrate 330B is arranged on the circuit board 310. The flexible substrate 330B electrically connects the electrical contact portion 202A and the connector 310C, and extends in the direction of the lens mount axis MA. When viewed from the direction of the lens mount axis MA, the connectors 310B and 310C are arranged so as not to overlap with the first lens 211 and the first lens holding member 212 arranged closest to the subject in each of the right eye optical system 201R and the left eye optical system 201L. With the above configuration, the circuit board 310 is capable of communicating with the camera body 110 through the lens mount 202 , and can control electronic components such as the aperture device 240 provided inside the interchangeable lens 200 .

[0045] In this embodiment, the circuit board 310 electronically controls the aperture device 240, but if there is an object that needs electronic driving control, such as when driving a lens for vibration reduction or autofocus, the circuit board 310 can take on the role of that electronic control.

[0046] The circuit board 310 is fixed to the lens top base 300 by screwing or the like. In addition, the lens top base 300 and the lens bottom base 301 are both base members of the twin-eye optical system unit, and the right-eye optical system 201R and the left-eye optical system 201L can advance and retreat in the optical axis direction integrally with the base members.

[0047] 1, the circuit board 310 is disposed between the two first optical axes OA1R and OA1L of the right-eye optical system 201R and the left-eye optical system 201L (a position sandwiched between the two first optical axes) and on the subject side of the second optical axes OA2R and OA2L. The circuit board 310 is also disposed on the axis of the lens mount 202 (on the lens mount axis MA). The board surface of the circuit board 310 (the surface on which the electric element 310A is disposed) is perpendicular to the lens mount axis MA.

[0048] Moreover, when viewed from the first optical axis direction or the lens mount axis MA direction, the circuit board 310 is arranged at a position overlapping with the subject-side lens surface 211A of the first lens group 211 arranged on the subject side of the circuit board 310. Moreover, the circuit board 310 is arranged on the image surface side of the subject-side lens surface 211A, and arranged at a position sandwiched between the sides of a lens with a small diameter. In FIG. 1, the circuit board 310 overlaps with the small diameter part of the first lens group 211, but it may be arranged at a position sandwiched between another lens located on the image surface side of the first lens group 211. That is, it is arranged at a position sandwiched between the sides of a lens member located on the image surface side of the subject-side lens surface 211A. Moreover, the circuit board 310 is arranged on an extension line of the optical axis of the third optical axis OA3. Moreover, the circuit board 310 is arranged in an area overlapping with the second prism 230, which is an optical member forming the second optical axis OA2, when viewed from the lens mount axis MA direction.

[0049] By arranging the circuit board 310 in such a position, the space between the two optical systems, which is generated by securing the first optical axis distance L1 that is an appropriate base line length for VR stereoscopic vision, can be effectively utilized, and it becomes possible to realize an arrangement with good space efficiency. In addition, it is advantageous for miniaturizing the interchangeable lens 200.

[0050] In the case of the interchangeable lens 200 in which two optical systems are imaged on one image sensor as in the present embodiment, the third optical axis OA3 is located inside the diameter of the lens mount 202, and the second optical axis OA2 protrudes to the outer diameter side of the main body of the interchangeable lens 200 in order to secure the base line length. In such a configuration, if a doughnut-shaped or C-shaped circuit board is arranged near the lens mount as in the past, it may affect the first prism 220, the second prism 230, and the internal components such as the holding frame and the lens bottom base 301 that hold them. As a result, the design freedom decreases and the interchangeable lens becomes larger. For example, when a doughnut-shaped or C-shaped circuit board is arranged near the lens mount as in the past, it is possible to arrange the second optical axis OA2 closer to the subject side to secure space. However, if the second optical axis OA2 is arranged closer to the subject side, the overall length of the optical system increases, and the outer diameter of the lens itself also increases accordingly, which leads to an increase in the size of the interchangeable lens. Conversely, by locating the second optical axis OA2 closer to the image plane, it is possible to shorten the overall lens length and reduce the lens diameter, which can contribute to making interchangeable lenses more compact.

[0051] In order to improve the efficiency of the circuit board 310 itself, the shape of the board surface of the circuit board 310 is made substantially rectangular rather than the conventional doughnut or C-shape, which allows for efficient arrangement and wiring of the electric elements 310A in the circuit board 310. Also, the substantially rectangular shape allows for more efficient punching with a press during the manufacturing process than the doughnut or C-shape. By increasing the number of pieces that can be obtained by pressing, costs can be reduced.

[0052] FIG. 11 is a front view of the interchangeable lens 200 excluding the front exterior member 204 and the cover member 213, as viewed from the subject side in the direction of the lens mount axis MA. The circuit board 310 is fixed to the lens top base 300 at the fixing portion 310D by screwing or the like. The fixing method may be screwing or bonding. When viewed from the subject side in the direction of the axis OA1, the fixing portion 310D is arranged at a position that does not overlap with the first lens 211 and the first lens holding member 212, which are lenses that are closer to the subject than the circuit board 310. Similarly, the connectors 310B and 310C are arranged at a position that does not overlap with the first lens 211 and the first lens holding member 212. With this arrangement, for example, the circuit board 310 can be assembled with only the front exterior 204 and the cover member 213 not assembled, and the circuit board 310 can be fixed and connected to a flexible board. Then, after the fixing and connection of the circuit board 310 are completed, the front exterior 204 and the cover member 213 can be assembled to complete the interchangeable lens 200. Even if it becomes necessary to replace the circuit board 310 due to a defect in the circuit board 310, the circuit board 310 can be accessed and replaced relatively quickly.

[0053] As described above, the circuit board 310 is disposed on the lens mount axis MA. When viewed from the direction of the lens mount axis MA, it is preferable that at least a part of the electric element 310A disposed on the circuit board 310 is disposed inside the diameter ΦD of the lens mount 202. When viewed from the direction perpendicular to the distance between the two first optical axes OA1R and OA1L (base line length L1 direction) and the first optical axis direction, it is preferable that the circuit board 310 is disposed between the two first optical axes OA1R and OA1L. This allows the interchangeable lens 200 to be further miniaturized. It is preferable for miniaturization that the fixing part 310D for attaching the circuit board 310 is also inside the diameter ΦD. However, depending on the fixing method and fixing location, there are cases where the outside of the diameter ΦD is preferable in terms of design. For this reason, by positioning at least the electric element 310A inside the diameter ΦD, a configuration that is more advantageous for miniaturization can be obtained.

[0054] Figures 12(A) and (B) are perspective views of the main parts of the interchangeable lens 200 as viewed from two different directions. Figures 12(A) and (B) show only the lens mount 202, the circuit board 310, and the peripheral components such as flexible boards 330A and 330B, and the base members such as the lens top base 300 and the lens bottom base 301. Figure 13 is a cross-sectional view showing the path of the flexible board 330B.

[0055] The flexible substrate 330B is electrically connected to the electrical contact portion 202A of the lens mount 202 and the connector 310C of the circuit board 310, and can communicate with the camera body 110. The flexible substrate 330B extends in the direction of the lens mount axis MA. In this embodiment, a lens bottom base 301 is arranged as a base member in a space where a donut-shaped or C-shaped circuit board was arranged as in the past. The lens bottom base 301 has a mechanism for moving the optical system in the optical axis direction configured near the outer periphery, which becomes an obstacle when connecting the flexible substrate 330B from the lens mount 202 to the circuit board 310. Therefore, in this embodiment, as shown in Figs. 12(A), (B) and 13, a through hole 301A is formed in the lens bottom base 301, and the flexible substrate 330B is configured to pass through the through hole 301A. With this configuration, the connection from the lens mount 202 to the circuit board 310 can be made over a relatively short distance.

[0056] Next, the arrangement of the circuit board 310 as a modified example of this embodiment will be described with reference to Fig. 14 and Fig. 15. Fig. 14 is a front view showing the arrangement of the circuit board 310 as a modified example of this embodiment, and is a view of the main part as seen from the subject side in the direction of the lens mount axis MA. Fig. 15 is a cross-sectional view showing the arrangement of the circuit board 310 as a modified example, and is a view of the main part as seen from a direction perpendicular to both the base line length direction and the first optical axis OA direction.

[0057] As shown in FIG. 14 and FIG. 15, the circuit board 310 can be arranged in a space-saving manner even if the board surface (the surface on which the electric element 310A is arranged) of the circuit board 310 is arranged so as to be parallel to each of the base line length direction and the first optical axis OA1. Even in this case, as shown in FIG. 14, at least the electric element 310A is arranged inside the diameter ΦD of the lens mount 202, so that the configuration is advantageous for miniaturization. Also, as shown in FIG. 15, when viewed from a direction perpendicular to each of the base line length direction and the first optical axis OA direction, the circuit board 310 is arranged at a position sandwiched between the first optical axis OA1 (OA1R, OA1L). Also, when viewed from a direction perpendicular to each of the base line length direction and the first optical axis OA direction, the circuit board 310 is arranged in an area overlapping the first lens 211 and the second prism 230, which is an optical member forming the second optical axis OA2. By arranging in this manner, a more space-efficient arrangement can be achieved.

[0058] According to the present embodiment, it is possible to provide a lens device and an imaging device for stereoscopic photography in which the circuit board is appropriately arranged to improve space efficiency.

[0059] 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]

[0060] 200 Interchangeable lenses (lens devices) 201R Right eye optical system (first optical system) 201L Left eye optical system (second optical system) 202 Lens mount 220 First prism (first reflecting surface) 230 Second prism (second reflecting surface) 310 Circuit Board 310A Electrical elements OA1R, OA1L First optical axis OA2R, OA2L Second optical axis OA3R, OA3L Third optical axis

Claims

1. A first optical system; and A second optical system; and A lens mount for attaching to the camera body, a circuit board for communicating with the camera body; a base member to which the first optical system, the second optical system, and the circuit board are attached, each of the first optical system and the second optical system is a bending optical system having a first reflecting surface and a second reflecting surface, and has, in order from an object side, a first optical axis, a second optical axis of light reflected by the first reflecting surface, and a third optical axis of light reflected by the second reflecting surface; When viewed from an axial direction of the lens mount, at least a part of an electric element disposed on the circuit board is disposed inside a diameter of the lens mount, A lens device, characterized in that the first optical system, the second optical system, and the circuit board are movable integrally with the base member in a first optical axis direction relative to the lens mount.

2. 2. The lens device according to claim 1, wherein the diameter of the lens mount is a diameter with which the lens mount fits into the camera body.

3. 3. The lens device according to claim 1, wherein when viewed from a direction perpendicular to the distance direction between the two first optical axes of the first optical system and the second optical system and from a direction perpendicular to each of the first optical axis directions, the circuit board is disposed between the two first optical axes.

4. A first optical system; and A second optical system; and A lens mount for attaching to the camera body, a circuit board for communicating with the camera body; a base member to which the first optical system, the second optical system, and the circuit board are attached, each of the first optical system and the second optical system is a bending optical system having a first reflecting surface and a second reflecting surface, and has, in order from an object side, a first optical axis, a second optical axis of light reflected by the first reflecting surface, and a third optical axis of light reflected by the second reflecting surface; the circuit board is disposed between the two first optical axes of the first optical system and the second optical system, on a subject side of the second optical axis, and on an axis of the lens mount; A lens device, characterized in that the first optical system, the second optical system, and the circuit board are movable integrally with the base member in a first optical axis direction relative to the lens mount.

5. 5. The lens device according to claim 1, wherein the circuit board is disposed on an extension of the third optical axis.

6. 6. The lens device according to claim 1, wherein a surface of the circuit board is perpendicular to an axial direction of the lens mount.

7. 6. The lens device according to claim 1, wherein the substrate surface of the circuit board is parallel to the distance direction between the two first optical axes of the first optical system and the second optical system, and to each of the first optical axis directions.

8. The circuit board has a fixing portion, The lens device according to any one of claims 1 to 5, characterized in that, when viewed from the axial direction of the lens mount, the fixing portion is arranged so as not to overlap with a first lens arranged closest to the subject in each of the first optical system and the second optical system, and a first lens holding member that holds the first lens.

9. Further comprising a first flexible substrate; a communication unit that communicates with the camera body is disposed in the lens mount; a first connector is disposed on the circuit board; 9. The lens device according to claim 1, wherein the first flexible board electrically connects the communication unit and the first connector and extends in an axial direction of the lens mount.

10. a base member to which the first optical system, the second optical system, and the circuit board are attached; 10. The lens device according to claim 9, wherein the first flexible substrate passes through a through hole formed in the base member.

11. An electronic component controlled by the circuit board; A second flexible substrate electrically connected to the electronic component, the circuit board has a second connector connected to the second flexible board; 11. The lens device according to claim 9, wherein the second connectors are arranged point-symmetrically around the axis of the lens mount.

12. The lens device described in claim 11, characterized in that when viewed from the axial direction of the lens mount, the first connector and the second connector are arranged so as not to overlap with a first lens arranged closest to the subject in each of the first optical system and the second optical system, and a first lens holding member that holds the first lens.

13. 13. The lens device according to claim 1, wherein when viewed from a first optical axis direction or when viewed from a direction perpendicular to each of the distance direction between the two first optical axes of the first optical system and the second optical system and the first optical axis direction, the circuit board has an area that overlaps with a first lens that is arranged closest to the subject in each of the first optical system and the second optical system, or an optical member that forms the second optical axis.

14. 14. The lens device according to claim 1, wherein the substrate surface of the circuit board is rectangular.

15. An imaging element; An imaging device comprising: a lens device according to claim 1 .

16. 16. The imaging apparatus according to claim 15, wherein the imaging element simultaneously captures two images with parallax formed by the first optical system and the second optical system.

Images