Lens device and imaging device

Abstract

To provide a lens device that can properly perform a focus adjustment for a plurality of optical systems by a simple operation.SOLUTION: A lens device (200) includes: a first optical system (201R); a second optical system (201L); a first focus adjustment unit (400) for adjusting the focus of the first optical system and the second optical system at the same time; and a second adjustment unit (500) for adjusting a relative displacement of a focus position between the first optical system and the second optical system. The first focus adjustment unit is connected to the first optical system and the second optical system and the second adjustment unit is connected to at least one of the first optical system and the second optical system.SELECTED DRAWING: Figure 11

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 Document 1 and Patent Document 2 disclose a lens device in which two optical systems are arranged in parallel, and two image circles are formed in parallel on one image sensor. To capture an image with parallax, it is necessary to adjust the focus of each of the two optical systems. For example, Patent Document 3 discloses binoculars in which the left and right diopter adjustment is performed by moving one optical system, and the focus adjustment is performed by switching the mechanism for moving both eyes with one operating member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-3022 A [Patent Document 2] JP 2012-113281 A [Patent Document 3] JP 2009-175498 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the binoculars disclosed in Patent Document 3, simultaneous focus adjustment of the left and right optical systems and relative focus adjustment of the left and right optical systems must be performed by switching the same operating member, which makes the operation complicated and makes it difficult to perform appropriate focus adjustment due to operational errors.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a lens device and an imaging device that are capable of appropriately adjusting the focus of a plurality of optical systems with a simple operation. [Means for solving the problem]

[0006] A lens device according to one aspect of the present invention has a lens mount that is detachably attached to a camera body and has a first optical system, a second optical system arranged in parallel with the first optical system, and a single imaging element on which a subject image is formed by the first optical system and the second optical system, respectively; a first focus adjustment unit that simultaneously adjusts the focus of the first optical system and the second optical system by simultaneously driving both the first optical system and the second optical system; and a second focus adjustment unit that adjusts a deviation in the relative focus position of the first optical system and the second optical system by driving either the first optical system or the second optical system.

[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 that are capable of appropriately adjusting the focus of a plurality of optical systems with a simple operation. [Brief description of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view of a lens device according to a first embodiment. [Diagram 2] 1 is an exploded perspective view of a lens device according to a first embodiment. [Diagram 3] 1 is an exploded perspective view of a lens device according to a first embodiment. [Figure 4] 1 is a front view of a lens device according to a first embodiment. [Diagram 5] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 6] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 7] 5 is a cross-sectional view taken along line BB in FIG. 4. [Figure 8]4 is a diagram showing the relationship between each optical axis and an image circle on an imaging element in the first embodiment. FIG. [Figure 9] 4A to 4C are diagrams illustrating reflections of a second optical system when an image is captured by a first optical system according to the first embodiment. [Figure 10] 1 is a schematic configuration diagram of an imaging device according to a first embodiment. [Figure 11] FIG. 11 is a schematic configuration diagram of an imaging device according to a second embodiment. [Figure 12] FIG. 11 is a schematic configuration diagram of an imaging device according to a second embodiment. [Figure 13] FIG. 11 is an exploded perspective view of a lens device according to a second embodiment. [Figure 14] FIG. 11 is a schematic diagram of a first focus adjustment unit in the second embodiment. [Figure 15] FIG. 11 is a top view of the vicinity of a lens top base in the second embodiment. [Figure 16] FIG. 11 is a side view of the vicinity of the lens top base in the second embodiment. [Figure 17] FIG. 13 is an exploded perspective view of a position adjustment mechanism according to the second embodiment. [Figure 18] FIG. 11 is a side view of a position adjustment mechanism according to the second embodiment. [Figure 19] 13 is an enlarged view of a position adjustment portion and a guide portion in the second embodiment. FIG. [Figure 20] FIG. 11 is a schematic diagram showing a load balance relationship in the second embodiment. [Figure 21] FIG. 11 is an exploded perspective view of a second focus adjustment unit in the second embodiment. [Figure 22] 13 is a cross-sectional view of a connection portion between a second focus adjustment portion and a right-eye optical system in the second embodiment. FIG. [Figure 23] 13 is a perspective view showing a state in which an eccentric rotation member and a connecting member are connected in the second embodiment. FIG. [Figure 24] 13 is a schematic diagram showing the positional relationship between an eccentric rotation member and a connecting member in the second embodiment. FIG. [Diagram 25]13 is a side view showing the configuration of a position adjustment mechanism for an optical system in the third embodiment. FIG. [Figure 26] 13 is an enlarged view of a position adjustment unit and a guide unit for an optical system according to a third embodiment. FIG. 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 each 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 sets of 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 effect. In this manner, the lens device of each embodiment is a lens device for stereoscopic photography (stereoscopic photography lens) capable of forming two images with parallax by the first optical system and the second optical system.

[0012] (First embodiment) First, a lens device (interchangeable lens) 200 in a first embodiment will be described with reference to Figs. 1 to 3. Fig. 1 is a cross-sectional view of the lens device 200, and shows a schematic configuration of a right-eye optical system (first optical system) 201R and a left-eye optical system (second optical system) 201L. Figs. 2 and 3 are exploded perspective views of the lens device 200. In the following description, the right-eye optical system is described with a suffix R, and the left-eye optical system is described with a suffix L. Descriptions common to both the right-eye optical system and the left-eye optical system are described with a suffix neither R nor L.

[0013] The lens device 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. Each optical system is a bending optical system, and in each optical system, a first optical axis OA1, a second optical axis OA2 substantially perpendicular to the first optical axis OA1, and a third optical axis OA3 parallel to the first optical axis OA1 are set in order from the subject side (object side) to the image side. In each optical system, a first lens group 211 having a surface 211A with a convex shape on the subject side is arranged on the first optical axis OA1, a second lens group 221 is arranged on the second optical axis OA2, and third lens groups 231 and 231-2 are arranged on the third optical axis OA3 along each optical axis. The lens group is composed of one or more lenses. In each optical system, a first prism (first reflecting surface) 220 that bends the light flux of the first optical axis OA1 and guides it 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 and guides it to the third optical axis OA3 are disposed. In the following description, the optical axis direction refers to the direction of the first optical axis OA1, which is the direction extending toward the subject side and the imaging surface side (image side).

[0014] Each of the right eye optical system 201R and the left eye optical system 201L is fixed to a lens top base (holding member) 300 by screw tightening or the like. The lens top base 300 is fixed to a lens bottom base 301 by screw tightening or the like. 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 rotational direction is restricted by a linear structure (not shown). This allows each of the right eye optical system 201R and the left eye optical system 201L to advance and retreat in the optical axis direction as a unit, 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 first lens group 211 and its surrounding structure will be described with reference to Fig. 4 to Fig. 7. Fig. 4 is a front view of the lens device 200. Figs. 5 and 6 are cross-sectional views taken along line AA in Fig. 4, showing the first lens group 211 of the lens device 200 and its surrounding structure. Fig. 7 is a cross-sectional view taken along line BB in Fig. 4, showing the first lens group 211 of the lens device 200 and its surrounding structure.

[0016] The lens device 200 includes an exterior cover member 203 that houses the right-eye optical system 201R and the left-eye optical system 201L, and the front side of the lens device 200 can be stored in a lid-like manner with a front exterior member 204. The front exterior member 204 is fixed to the exterior cover member 203 by screw tightening. The front exterior member 204 has an opening 204F into which the first lens group 211R of the right-eye optical system 201R and the first lens group 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 lens group 211R, 211L has a lens surface 211A on the subject side, which is also the incident surface of the effective light beam. When the effective incident surface 211B is the lens surface 211A of the first lens group 211 that is inside the effective incident surface outer diameter 211C, the 180-degree light beam extends horizontally in a direction approximately perpendicular to the effective incident surface 211B of the first lens group 211 and the optical axis. The light beam that exceeds 180 degrees is located closer to the imaging surface than the effective incident surface 211B of the first lens group 211, and extends further toward the imaging surface as it moves away from the first lens group 211. Therefore, in order not to block light beams exceeding 180 degrees, the surface shape of the front exterior member 204 is disposed closer to the imaging surface than the effective incidence surface 211B of the first lens group 211. Similarly, the cover member 213 is disposed closer to the imaging surface than the effective incidence surface B.

[0018] A detailed description will be given with reference to Fig. 4 and Fig. 7. As shown in Fig. 4, the right eye region 20R is a region closer to the right eye optical system 201R than the center point O between the right eye optical system 201R and the left eye optical system 201L, and the left eye region 20L is a region closer to the left eye optical system 201L than the center between the right eye optical system 201R and the left eye optical system 201L. 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 farther away from the first lens group 211L so as not to block the outermost effective light flux (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 farther away from the first lens group 211R of the right eye optical system 201R so as not to block the effective light flux of the right eye optical system 201R. However, the first lens group 211L of the left eye optical system 201L and its surroundings as seen from the right eye optical system 201R, and the first lens group 211R of the right eye optical system 201R and its surroundings as seen from the left eye optical system 201L, also have areas that block part of each other's effective light beam.

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

[0020] Next, a description will be given of the first lens group 211R, 211L that enters the opening 204F of the front exterior member 204 and the configuration around them. As shown in Fig. 5, a holding member 212 that holds the first lens group 211R, 211L is provided. In addition, a cover member 213 having an opening 213A into which the first lens group 211R, 211L enters is arranged so as to cover the outer periphery of the subject-side lens surface 211A of the first lens group 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 group 211. The boundary 211D is a boundary between the side surface 211E of the first lens group 211R, 211L and the lens surface 211A. Alternatively, as shown in FIG. 6, it may be an inner diameter tip portion of a crimp claw shape that crimps and fixes the first lens group 211R, 211L. The boundary 211D is a boundary between the lens surface 211A and other surfaces or members. The cover member 213 covers the boundary 211D. That is, the inner diameter of the opening 213A of the cover member 213 is smaller than the diameter of the boundary 211D. 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).

[0022] X = (ΦB - ΦA) / 2 (1) In this way, by covering and concealing boundary 211D, it is expected that the appearance quality will be improved. Cover member 213 is positioned in the optical axis direction with lens holding member 212, and a predetermined play Y is provided in the direction perpendicular to the optical axis. Since the predetermined play Y is smaller than the overlap amount X of cover member 213, boundary 211C will not come to the inside of opening 213A of cover member 213 even if it moves toward the cover member 213 by the play.

[0023] As shown in FIG. 5 and FIG. 6, the cover member 213 has a groove 213B formed on a part of the inner circumference, and the lens holding member 212 has a wing shape 212A formed on a part of the outer circumference extending to the outer periphery. The groove 213B and the wing shape 212A are assembled when they are in 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, the cover member 213 and the lens holding member 212 can be positioned in the optical axis direction. At this time, a predetermined play Y is provided on the inner circumference of the cover member 213 and the outer circumference of the lens holding member 212. However, the position regulation structure in the optical axis direction is not limited to this. For example, the lens holding member 212 may have a groove shape, and the cover member 213 may have a wing shape.

[0024] In this way, the cover member 213 is positioned in the optical axis direction relative to the lens holding member 212, and therefore can advance and retreat in the optical axis direction integrally with the lens 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.

[0025] Furthermore, a rotation restriction key 213C is provided on the cover member 213, and a rotation restriction groove 204E corresponding to the rotation restriction key 213C is provided on the front exterior member 204. As a result, 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, and the rotation of the cover member 213 is restricted. Therefore, the above-mentioned bayonet configuration can prevent the cover member 213 from rotating and coming off the lens holding member 212. Here, the relationship of the rotation restriction structure may be reversed, and the relationship may be such that the rotation restriction groove is on the cover member 213 and the rotation restriction key is on the front exterior member 204.

[0026] The cover member 213 has a surface 213D facing the image surface, and the lens holding member 212 has a surface 212B facing the subject side opposite to surface 213D. An optical axis direction seal member 214 for preventing drips and dusts is sandwiched between surfaces 213D and 212B. Surfaces 213D and 212B are preferably the entire circumference, but 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 lens holding member 212 are biased in the optical axis direction, and rattle in the optical axis direction can be reduced.

[0027] 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 lens holding member 212 in the direction perpendicular to the optical axis direction.

[0028] A radial seal member 215 for splash and dust protection 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. 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.

[0029] 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 lens holding member 212 is not directly fitted to the opening 204F of the front exterior member 204, even if the lens holding member 212 is misaligned due to the influence of manufacturing errors or the like, the position is not corrected. 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.

[0030] FIG. 8 is a diagram showing the relationship between the positions of the optical axes and mounts of the lens device 200 and the positions of the image circles on the imaging element 111 on the camera body 110 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 the center of the right-eye image circle ICR to be approximately in the center of the right area of ​​the light receiving range, and set the center of the left-eye image circle ICL to be approximately in the center of the left area of ​​the light receiving range.

[0031] In addition, 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, and two circular images are 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.

[0032] 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 OA3R and OA3L is 18 mm, and the length of the second optical axis OA2 is 21 mm. When the optical systems are arranged so that the second optical axis OA2 extends horizontally, the base length L1 shown in FIG. 1 is 60 mm, which is approximately equal to the interpupillary distance of an adult. The diameter ΦD of the lens mount unit 202 may be shorter than the base length L1. By making the distance L2 between the third optical axes OA3R and OA3L shorter than the diameter ΦD of the lens mount unit 202, the third lens group 231, 231-2 can be arranged inside the mount. That is, in this embodiment, the relationship of the following formula (2) is satisfied.

[0033] 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).

[0034] ΦD2>ΦD3 (3) FIG. 9 shows 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 described above is imaged inside ΦD2, which is the effective angle of view, but is not imaged at a 180-degree angle of view and is imaged outside ΦD3. Therefore, when viewing as VR, there is no effect when viewing at a 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 group 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 group 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. Also, the reflection of the wall 204D is captured outside (left side in FIG. 9) from the apex of the first lens group 211L even when viewed in the horizontal direction. In the fisheye circular image, since it is captured outside from the apex of the first lens group 211L even when viewed in the horizontal direction, there is an advantage when cutting the reflection of the adjacent lens by trimming during image processing or image editing. That is, in this case, the reflection of the wall 204D will not have an effect if it is cut in the horizontal direction up to the apex of the first lens group 211L, which is necessarily reflected due to the specifications, for example, by cutting the outside of the line Z in the horizontal direction from the line Z in FIG. 9. Therefore, there is an advantage that the minimum necessary cut is sufficient. The above points are also the same for the reflection of the first optical system when imaged with the second optical system.

[0035] As described above, although the wall portion 204D is within the effective angle of view, it is disposed so as to have almost no effect on image capture for actual VR use.

[0036] 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 a lens device 200. The lens device 200 is detachable from the camera body 110. In this embodiment, the imaging device 100 is an imaging system having a camera body (imaging device body) 110 and a lens device (interchangeable lens) 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.

[0037] The lens device 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.

[0038] The image of the subject is formed on the imaging element 111 in such a manner that 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 are arranged side by side. 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.

[0039] 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.

[0040] Second Embodiment Next, a second embodiment will be described. Fig. 11 is a schematic diagram of an image capturing device 100 in this embodiment. The image capturing device 100 is configured to include a camera body (image capturing device body) 110 and an interchangeable lens (lens device) 200 that is detachable from the camera body 100. As in the first embodiment, the interchangeable lens (lens device) 200 is attached to the image capturing device 110 for use.

[0041] The imaging device 100 is an imaging device equipped with a so-called interchangeable lens mount, and has a single imaging element 111. On the other hand, the lens device 200 is a lens device equipped with a right-eye optical system 201R and a left-eye optical system 201L, as described above. The lens device 200 in this embodiment is configured by attaching the left and right optical systems to a lens top base (holding member) 300.

[0042] The left-eye optical system 201L is fixed to the lens top base 300. On the other hand, the right-eye optical system 201R is supported on the lens top base 300 so as to be movable in a direction perpendicular to the image sensor 111. This allows the left-eye optical system 201L and the right-eye optical system 201R to move relatively in a direction perpendicular to the image sensor 111. The right-eye optical system 201R and the left-eye optical system 201L in this embodiment are the same optical system, and are configured as a lens group with an integrated imaging optical system (image sensor optical system), and are configured so that focus adjustment can be performed by extending the entire optical system. The lens device 200 is intended to create parallax images as described above. For this reason, if the left and right optical systems are different or if some lenses in the entire optical system are configured as focus lenses, a difference occurs in the optical characteristics of the left and right images, which may result in discomfort as the left and right images are parallax images.

[0043] In this embodiment, as described above, the left and right optical systems are extended as a whole, so that the characteristic difference between the optical systems of the left and right lenses can be reduced. Here, in this embodiment, the left eye optical system 201L is the first optical system, and the right eye optical system 201R is the second optical system. However, this embodiment is not limited to this, and for example, the first optical system and the second optical system may be reversed optical systems, or the optical systems may be arranged vertically instead of horizontally.

[0044] The imaging device 100 includes a mount section 202, and the lens device 200 is attached via the mount section 202. For this reason, the imaging element 111 in the imaging device 100 is placed parallel to the mount section 202. However, due to manufacturing errors, it is difficult to achieve perfect parallelism, and the imaging element 111 is fixed to the mount section 202 with a slight inclination.

[0045] FIG. 12 is a schematic diagram of the imaging device 100, and shows a state in which the imaging element 111 is fixed with a slight inclination with respect to the mount unit 202. In the manufacturing process of the lens device 200, the distances of the imaging positions of the right-eye optical system 201R and the left-eye optical system 201L from the respective mount units, so-called flange back distances, can be adjusted. However, even if the differences between them are brought close to 0, the left and right optical systems do not necessarily reach the best focusing positions due to the inclination of the imaging element 111 in the imaging device 100. Therefore, in this embodiment, as described above, the right-eye optical system 201R is configured to be movable in the axial direction perpendicular to the imaging surface, thereby making it possible to adjust the relative focus positions of the left and right eyes.

[0046] On the other hand, adjusting the flange backs of the left and right optical systems each time shooting is performed may result in missed shooting opportunities due to the time lost due to the adjustment work, and the operation may become complicated. To avoid this, it is necessary to enable a quick and accurate focusing operation by a simple method. Therefore, in this embodiment, a lens top base 300 that holds the right eye optical system 201R and the left eye optical system 201L, and a first focus adjustment unit (focus ring) 400 that drives the lens top base 300 in an axial direction perpendicular to the imaging surface are provided. The first focus adjustment unit 400 allows the right eye optical system 201R and the left eye optical system 201L to move simultaneously in an axial direction perpendicular to the imaging element 110, and allows simultaneous focus adjustment while holding the left and right optical systems integrally. The first focus adjustment unit is attached to the exterior cover member 203, so that the user can operate it.

[0047] On the other hand, the second focus adjustment unit 500, which is connected to the right eye optical system 201R and can move the right eye optical system 201R in the axial direction perpendicular to the image sensor 110, can also be operated by the user by attaching it to the exterior cover member 203. The second focus adjustment unit 500 adjusts the deviation of the relative focal positions of the right eye optical system 201R and the left eye optical system 201L.

[0048] By independently operating these, the user can adjust the flange back of the left and right optical systems of the lens device 200 using the second focus adjustment unit 500 according to the inclination of the image sensor 111 of the image sensor 100 owned by the user. When taking a picture, by adjusting the relative deviation of the flange back positions of the left and right optical systems in advance, it is possible to perform a quick focusing operation simultaneously on both optical systems by adjusting only the first focus adjustment unit 400. Both the first focus adjustment unit 400 and the second focus adjustment unit 500 are rotatably held by the exterior cover member 203, and both are fixed so as not to move in the focusing direction. The focusing direction in this embodiment is an axial direction perpendicular to the image sensor.

[0049] Next, a configuration for realizing the above-mentioned focusing mechanism will be described in detail with reference to Fig. 13. Fig. 13 is an exploded perspective view of the lens device 200 in this embodiment.

[0050] The right-eye optical system 201R is held so as to be movable relative to the lens top base 300 in a direction perpendicular to the image sensor 110. On the other hand, the left-eye optical system 201L is fixed to the lens top base 300. The lens top base 300 is fixed to the lens bottom base 301 with screws or the like. The lens bottom base 301 is provided with cam follower parts 301a at three locations. The cam follower parts 301a come into contact with a cam member 302 described below, thereby enabling driving in a direction perpendicular to the image sensor 110. The cam member 302 is engaged with and held by an exterior base member 303. In addition, the cam member 302 is engaged with a first focus adjustment part (focus ring) 400 by a key part 302a, so that when a user rotates the first focus adjustment part 400, the cam member 302 connected to the inside of the lens device 200 can be rotated. Moreover, the first focus adjustment unit 400 is sandwiched between the exterior member 303 and the cover member 304, so that it is held in the radial direction by the exterior member, and rotatably held in the axial direction by being sandwiched between the two members. When the cam member 302 rotates, the lens bottom base 300 moves along the inclined surface portion 302b provided on the cam member 302, so that the left and right optical systems can move in the axial direction perpendicular to the image pickup element 110, and the focus adjustment of the left and right optical systems can be performed.

[0051] 14 is a schematic diagram of the first focus adjustment unit 400 of the imaging device 100. The lens top base 300 is integrally configured with the lens bottom base 301 by fastening with a screw or the like. The cam follower portion 301a formed on the lens bottom base 301 is supported by a spring or the like so as to abut against the inclined surface portion 302b formed on the cam member 302. As described above, the cam member 302 is supported by a spring or the like on the exterior member 303, and is rotatably held by holding the outer diameter portion in the exterior member 303 in a so-called diameter fitting state. This makes it possible to drive the lens top base 300 to which the left and right eye optical systems are fixed by rotating the first focus adjustment unit 400.

[0052] The right eye optical system 201R is connected to a second focus adjustment unit 500 described later and driven in an axial direction perpendicular to the image sensor 110. The left and right optical systems are each fixed to the lens base top 300. However, the right eye optical system 201R can be driven in an axial direction perpendicular to the image sensor 110, and the second focus adjustment unit 500 can adjust the relative focus of the left and right optical systems, and the first focus adjustment unit 400 can adjust the integrated focus of the left and right eyes.

[0053] Next, a mechanism for attaching the right (left) eye optical system 201R(L) to the lens top base 300 will be described in detail with reference to Fig. 15 and Fig. 16. Fig. 15 is a top view of the vicinity of the lens top base 300. Fig. 16 is a side view of the vicinity of the lens top base 300.

[0054] 3 and 13, the right-eye optical system 201R and the left-eye optical system 201L are disposed so as to sandwich the lens top base 300. The base prism bottom 311L(R) constituting the left (right) eye optical system 201L(R) is configured so as to be attachable to and detachable from the lens top base 300 in the left-right direction of the drawing. The lens top base 300 is disposed between the first optical axes OA1L(R) and is disposed so that the second optical axis OA2L(R) passes through it. If the lens top base 300 is disposed between the third optical axes OA3L(R), the interval between the third optical axes OA3L(R) becomes wider, and the lens top base 300 becomes so large that it cannot be inserted into the mount.

[0055] The surface where the two members of the lens top base 300 and the base prism bottom 311R come together (i.e., the surface where the right-eye optical system 201R is joined to the lens top base 300) is defined as a joining surface (first joining surface) 312R. Similarly, the surface where the two members of the lens top base 300 and the base prism bottom 311L come together (i.e., the surface where the left-eye optical system 201L is joined to the lens top base 300) is defined as a joining surface (second joining surface) 312L. The joining surface 312L(R) is disposed in a direction perpendicular to the line OA1 connecting the two first optical axes OA1L(R) along a direction perpendicular to the first optical axis OA1L(R). The joining surface 312L(R) is disposed parallel to the first optical axis OA1L(R) and the third optical axis OA3L(R), and is disposed between the first optical axis OA1L(R) and the third optical axis OA3L(R). Such an arrangement can improve space efficiency and allows the circuit board 310 to be disposed between the two coupling surfaces 312L(R). In addition, the coupling surface 312L(R) is disposed perpendicular to the second optical axis OA2L(R).

[0056] Next, the focus position adjustment mechanism for moving the right-eye optical system 201R relative to the lens base top 300 will be described in detail with reference to Fig. 17 to Fig. 19. Fig. 17 is an exploded perspective view of the position adjustment mechanism for adjusting the position of the right-eye optical system 201R relative to the lens base top 300. Fig. 18 is a side view of the position adjustment mechanism. Fig. 19 is an enlarged view of the adjustment section and guide section of the right-eye optical system 201R.

[0057] 17 and 18, the right eye optical system 201R is constantly biased in a predetermined direction (attachment direction) against the lens base top 300 by three screws 501a, 501b, 501c and three compression springs (first biasing members) 502a, 502b, 502c. In this state, the right eye optical system 201R is attached in contact with a coupling surface (first coupling surface) 312R, which is an attachment portion of the lens base top 300. An eccentric rotation member (position adjustment portion) 503 is rotatably attached to the lens base top 300 by a shoulder screw 504, and at the same time, the outer periphery of the eccentric rotation member fits into a hole portion 251 of the right eye optical system 201R.

[0058] As shown in FIG. 19, the eccentric rotation member 503 has an outer shape center OZ2 eccentric with respect to the rotation center OZ1. When the eccentric rotation member 503 rotates, the right eye optical system 201R can be adjusted in the optical axis direction while sliding with respect to the lens base top 300 by the amount of eccentricity of the outer shape center OZ2 with respect to the rotation center OZ1. A first tension spring (third biasing member) 507 is hung between the right eye optical system 201R and the lens base top 300, and they are configured to bias each other in the optical axis direction. Therefore, when the eccentric rotation member 503 rotates, the right eye optical system 201R moves in the optical axis direction relative to the lens base top 300 by abutting against the D-cut portion 251a of the hole portion 251. Also, the right eye optical system 201R is configured to be able to move parallel to the optical axis direction by the rotation of the eccentric rotation member 503. Specifically, the two rolling bearings (guide sections) 505a, 505b are arranged parallel to the optical axis direction, and are rotatably attached to the lens base top 300 by shoulder screws 506a, 506b. The two rolling bearings 505a, 505b fit into the linear guide sections 252a, 252b, 253a, 253b of the guide holes 252, 253 of the right eye optical system 201R, and function as linear guide sections for moving the right eye optical system 201R in a direction parallel to the optical axis (adjustment direction).

[0059] 18, a second tension spring (second biasing member) 508 is hung between the right-eye optical system 201R and the lens base top 300. The second tension spring 508 is disposed across the optical axis of the right-eye optical system 201R with respect to the decentering rotation member 503, and biases the right-eye optical system 201R in the adjustment direction and in a direction perpendicular to the adjustment direction in the same plane. With this configuration, the right-eye optical system 201R is biased in the optical axis direction, and a rotation moment is generated with the contact portion between the decentering rotation member 503 and the hole portion 251a of the right-eye optical system 201R as the starting point. The force of the second tension spring 508 prevents the right-eye optical system 201R from rattling, and allows it to move while being guided by the two rolling bearings 505a and 505b.

[0060] Next, the relationship between the weight, friction, and spring (load balance relationship) generated between the lens base top 300 and the right eye optical system 201R will be described with reference to Figs. 20(a) and (b). Figs. 20(a) and (b) are schematic diagrams showing the load balance relationship. The mass of the right eye optical system 201R is m, the gravitational acceleration is g, and the static friction coefficient generated between the lens base top 300 and the right eye optical system 201R is μ. In addition, the normal force generated between the right eye optical system 201R or the left eye optical system 201L and the lens base top 300 is N. In addition, the spring constant of the three compression springs 502a to 502c is k1, the displacement amount (extension amount) is x1, the spring constant of the first tension spring 508 is k2, the displacement amount is x2, and the spring constant of the second tension spring 507 is k3, and the displacement amount is x3. In this case, when the right-eye optical system 201R faces the direction of gravity, it is preferable to satisfy the following conditional expressions (4) and (5).

[0061] μN+mg <k2x2+k3x3 ···(4) N = 3 × (k1x1) (5) When there is no second tension spring 507, it is preferable to satisfy the following conditional expressions (4a) and (5a): In the conditional expression (5a), N is the sum of the spring constants of the three compression springs 502a to 502c.

[0062] μN+mg <k2x2 ···(4a) N = k1x1 (5a) Furthermore, when the second tension spring 507 is present, it is preferable that the following conditional expressions (4b) and (5b) be satisfied: In the conditional expression (5b), N is the sum of the spring constants of the three compression springs 502a to 502c.

[0063] μN+mg <k2x2+k3x3 ···(4b) N = k1x1 (5b) By achieving such a load balance, the eccentric rotation member 503 and the right-eye optical system 201R always come into contact without rattling, no matter how the orientation of the lens device 200 changes. Therefore, there is no problem that the lens part of the right-eye optical system 201R does not follow the adjustment of the eccentric rotation member. With the configuration described above, even if the adjustment part is located away from the optical axis, it is possible to move the right-eye optical system 201R as intended without rattling. Similarly, the left-eye optical system 201L is attached in contact with the attachment surface 311L of the lens base top 300, has an adjustment mechanism similar to that of the right-eye optical system 201R, and is slidable in a direction parallel to the optical axis relative to the lens base top 300 by the above-mentioned adjustment operation.

[0064] The second focus adjustment unit described later can be adjusted from the outside by the user by connecting it to the right-eye optical system 201R, but the left-eye optical system 201L can also be adjusted in the assembly process of the lens device 200, so that the degree of freedom of position adjustment during assembly can be increased. The right-eye optical system 201R and the left-eye optical system 201L are slidably attached to the lens base top 300, and are configured to suppress relative left-right tilt and decentering during focus adjustment without using other parts. In this embodiment, an eccentric rotating member has been described as an example of an adjustment member that adjusts the focus position of the optical system, but it does not have to be an eccentric rotating member. In addition, a rolling bearing has been described as an example of a linear guide member, but the linear guide member is not limited to this, and may be a bar member.

[0065] Next, the second focus adjustment unit 500 will be described in detail with reference to FIG. 21. FIG. 21 is an exploded perspective view of the second focus adjustment unit 500. The small base 521 is attached to the cover member 304 described above by a screw 525. The adjustment pin 526 is inserted into the small base 521 and fixed. The adjustment pin 526 inserted into the small base 521 is biased in the insertion direction by the biasing spring 522 and held. The biasing spring (elastic member) 522 is sandwiched between a stop ring 523 attached to the tip of the adjustment pin 526 and the small base 521, and biases and holds the adjustment pin 526 against the small base 521. A connecting member 524 is engaged with the tip of the adjustment pin 526. A first guide portion 526a that engages with the connecting member 526 is provided at the tip of the adjustment pin 526. First guide portion 526a is engaged with second guide portion 524a provided on connecting member 524, whereby adjustment pin 526 is held movably in a direction perpendicular to the axis of adjustment pin 526.

[0066] Next, the connection portion between the second focus adjustment section 500 and the right eye optical system 201R will be described in detail with reference to Fig. 22. Fig. 22 is a cross-sectional view of the connection portion between the second focus adjustment section 500 and the right eye optical system 201R.

[0067] As described above, the first guide portion 526a, which is the tip of the adjustment pin 526, and the second guide portion 524a provided on the connecting member 524 are held in an engaged state. Meanwhile, the connecting member 524 is provided with the third guide portion 524b on the side opposite to the second guide portion 524a. In this embodiment, the second guide portion 524a is configured as a vertical groove-shaped hole, while the third guide portion 524b is configured as a key-shaped protrusion. However, this embodiment is not limited to this, and the shapes of the groove and the protrusion may be reversed. Also, the third guide portion 524b engages with the fourth guide portion 503a provided on the eccentric rotating member 503.

[0068] Here, the second guide portion 524a and the third guide portion 524b of the connecting member 524 are disposed in directions intersecting each other. In this embodiment, the second guide portion 524a and the third guide portion 524b are provided in directions perpendicular to each other. Therefore, the direction in which the connecting member 524 can engage with and move relative to the adjustment pin 526 is a direction perpendicular to the axis of the adjustment pin 526, and the direction in which the connecting member 524 can move relative to the eccentric rotation member 503 is a direction perpendicular thereto. As a result, even if the positional relationship between the cover member 203 and the right eye optical system 201R is changed by the operation of the first focus adjustment unit 400, the right eye optical system 201R can be moved independently in a direction perpendicular to the image sensor 111 by rotating the adjustment pin 526.

[0069] Although the connection form when the first focus adjustment unit 400 and the second focus adjustment unit 500 are operated will be described later, with the above-mentioned configuration, the user can rotate the adjustment pin 526 to transmit rotation (rotational driving force) to the eccentric rotation member 503. As described above, the eccentric rotation member 503 rotates so that the contact portion with the decentered right-eye optical system 201R moves in the axial direction perpendicular to the image sensor 111, thereby moving the right-eye optical system 201R. This makes it possible to change the relative positional relationship with the left-eye optical system 201L fixed to the lens top base 300.

[0070] The eccentric rotating member 503 is given a frictional holding force by being biased against the base lens top 300 by the biasing spring 527 and the stopper pin 528. This makes it possible to prevent the right eye optical system 201R from easily moving due to unintended impact or the like. In this embodiment, the second focus adjustment unit 500 connected to the right eye optical system 201R has been described as an example, but the left eye optical system 201L may also be provided with a focus adjustment mechanism, and the left eye optical system 201L and the second focus adjustment unit 500 may be configured to be connected. In addition, the left and right optical systems may each be provided with a mechanism that allows the user to adjust the rotation from the outside with the adjustment pin 526.

[0071] Next, the relationship between the eccentric rotation member 503 and the connecting member 524 will be described in detail with reference to FIG. 23. FIG. 23 is a perspective view of the eccentric rotation member 503 and the connecting member 524 connected to each other. As described above, the eccentric rotation member 524 includes the second guide portion 524a, which is a groove that engages with the first guide portion 526a provided on the adjustment pin 526 of the second focus adjustment unit 500. This groove is configured as a vertical groove extending in the X direction since it is supported movably in the X direction in FIG. 23 when it engages with the first guide portion 526a. On the other hand, the third guide portion 524b is disposed on the side facing the second guide portion 524a and the adjustment pin 526 in the axial direction, and is configured as a key portion extending in the Y direction in FIG. 23, which is a direction that is approximately perpendicular to the second guide portion 524a and the adjustment pin 526 and is a direction that crosses each other. As a result, the connecting member 524 is held so as to be freely movable in the Y direction with respect to the eccentric rotation member 503 and in the X direction with respect to the adjustment pin 526.

[0072] Next, with reference to Fig. 24, the movements of the first focus adjustment unit 400 and the second focus adjustment unit 500 when they are rotated will be described in detail. Fig. 24 is a diagram showing the positional relationship between the eccentric rotation member 503 and the connecting member 524 in each state when the first focus adjustment unit 400 and the second focus adjustment unit 500 are operated. The circle shown by the thick line in Fig. 24 shows the eccentric rotation member 503. The circle shown by the thin line is the connecting member 524, and the second guide portion 524a provided on the connecting member 524 is shown by the thin line, and the third guide portion 524b is shown by the thin dotted line.

[0073] As described above, the eccentric rotation member 503 is held by the lens top base 300. Therefore, by operating the first focus adjustment unit 400, the lens top base 300 is moved in the direction of an axis perpendicular to the image pickup element 111, and the eccentric rotation member 503 attached to the lens top base 300 is also moved integrally. Here, the direction of the axis perpendicular to the image pickup element 111 is the direction of the arrow AX in FIG. 24. At this time, when the lens top base 300 is driven in the direction of the arrow AX by the first focus adjustment unit 400 as in state (1) or state (2), the eccentric rotation member 503 also moves in the direction of the arrow AX accordingly.

[0074] The eccentric rotation member 503 and the connecting member 524 are engaged with each other in a key-and-groove relationship by the third guide portion 524b and the fourth guide portion 503a, thereby restricting the movement in the X direction described above. Therefore, when the eccentric rotation member 503 is driven in the direction of the arrow AX by the first focus adjustment unit 400 as described above, the connecting member 524 also moves in the direction of the arrow AX accordingly. In addition, if the rotation center point of the eccentric rotation member 503 is point A and the rotation center of the adjustment pin 526 engaged with the connecting member 524 is point B, then in the neutral position, point A and point B are at the same position.

[0075] On the other hand, in states (1) and (2), point B is the rotation center of adjustment pin 526 and therefore always exists in the same position, while point A moves in the direction of arrow AX with the drive of first focus adjustment unit 400. In connection member 524, second guide portion 524a is a groove extending in the X direction described above, and first guide portion 526a provided on adjustment pin 526 that engages with it is configured with a key shape that engages with second guide portion 524a. Therefore, relative to adjustment pin 526 rotatably fixed to cover member 203, connection member 524 has a degree of freedom in the X direction in FIG. 24, but movement in the Y direction is restricted. Therefore, points A and B exist on the axis in the X direction.

[0076] On the other hand, considering a state in which the adjustment pin 526 is rotated from the neutral position and the first focus adjustment unit 400 is driven as in state (3), the eccentric rotation member 503 and the connecting member 524 are driven in the X direction by the driving of the first focus adjustment unit 400. Meanwhile, point B, which is the rotation center of the adjustment pin 526, is always at the same position, and the first guide portion 526a provided on the adjustment pin 526 engages with the second guide groove 524b of the connecting member 524. For this reason, point B needs to be on the X axis, which is the center line of the second guide groove. Since the connecting member 524 has degrees of freedom of movement in the X and Y directions, even if the first focus adjustment unit 400 and the second focus adjustment unit 500 are operated respectively, the adjustment pin 526 and the eccentric rotation member 503 can always be kept connected to each other by the connecting member 524. Therefore, the first focus adjustment section 400 and the second focus adjustment section 500 can be operated independently of each other.

[0077] (Third embodiment) Next, a third embodiment will be described. This embodiment is a modified example of the right eye (left eye) adjustment mechanism (position adjustment mechanism) for the lens base top 300 of the second embodiment described with reference to Figs. 17 to 19. The position adjustment mechanism of the optical system will be described with reference to Figs. 25 and 26. The basic configuration of this embodiment is common to the second embodiment. Therefore, in this embodiment, the same reference numerals are used for the same configuration as in the second embodiment 2, duplicated explanations are omitted, and different configurations are explained with additional details. Fig. 25 is a side view showing the configuration of the position adjustment mechanism of the optical system in this embodiment. Fig. 26 is an enlarged view of the position adjustment unit and guide unit of the optical system.

[0078] The eccentric rotation member 603 is rotatably attached to the lens base top 300 by the shoulder screw 604, and at the same time, the outer periphery of the eccentric rotation member 603 is fitted into the hole portion 751 of the right eye optical system 201R. As in the second embodiment, the eccentric rotation member 603 has an outer shape center eccentric with respect to the rotation center. Therefore, when the eccentric rotation member 603 rotates, the right eye optical system 201R can be adjusted in the optical axis direction while sliding with respect to the lens base top 300 by an amount of eccentricity of the outer shape center with respect to the rotation center. When the eccentric rotation member 603 rotates, the right eye optical system 201R is moved in the optical axis direction with respect to the lens base top 300 by abutting against the D-cut portion 751a of the hole portion 751. In addition, two rolling bearings 605a, 605b are arranged parallel to the optical axis direction and are rotatably attached to the lens base top 300 by shoulder screws 606a, 606b so that the right eye optical system 201R can move parallel to the optical axis direction by rotating the eccentric rotation member 603.

[0079] The two rolling bearings 605a and 605b are simultaneously fitted with the linear guide parts 752a, 752b, 753a, and 753b of the guide holes 752 and 753 of the right-eye optical system 201R, and function as linear guide parts for moving the right-eye optical system 201R in a direction parallel to the optical axis. As shown in FIG. 25 and FIG. 26, the eccentric rotating member 603 is disposed on a line parallel to the optical axis OA1 connecting the centers of the two rolling bearings 605a and 605b. That is, the eccentric rotating member 603 is disposed on the guide line of the rolling bearings 605a and 605b having a linear guide function, so that the line of action of the adjustment of the eccentric rotating member 603 coincides with the center line of the two rolling bearings 605a and 605b. As a result, the tracking ability of the lens part of the right-eye optical system 201R is improved. With the configuration described above, even if the adjustment unit is disposed at a position away from the optical axis, it is possible to move the right eye optical system 201R as intended without rattling. Note that, although the eccentric rotating member 603 is disposed on the line connecting the centers of the two rolling bearings 605a and 605b in this embodiment, it may be disposed on an extension of the line connecting the centers of the two rolling bearings 605a and 605b.

[0080] According to each embodiment, it is possible to provide a lens device and an imaging device that are capable of appropriately adjusting the focus of a plurality of optical systems with a simple operation.

[0081] 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]

[0082] 200 Lens device 201R Right eye optical system (first optical system) 201L Left eye optical system (second optical system) 400 First focus adjustment unit 500 Second focus adjustment unit

Claims

1. A lens device that is detachable from a camera body, A first optical system; and a second optical system arranged in parallel with the first optical system; a lens mount for detachably mounting to the camera body, the lens mount being provided with a single image sensor on which a subject image is formed by the first optical system and the second optical system; a first focus adjustment unit that simultaneously performs focus adjustment of the first optical system and the second optical system by simultaneously driving both the first optical system and the second optical system; a second focus adjustment unit that adjusts a relative focus position deviation between the first optical system and the second optical system by driving one of the first optical system and the second optical system; and A lens device comprising:

2. 2. The lens apparatus according to claim 1, wherein the first optical system and the second optical system are an image-forming optical system constituted by a same optical system.

3. an eccentric rotating member that rotates one of the first optical system or the second optical system in a direction perpendicular to an imaging surface; 4. The lens device according to claim 1, wherein the eccentric rotation member is connected to the second focus adjustment unit.

4. a connecting member that connects the second focus adjustment unit and the eccentric rotation member, the second focus adjustment unit has a first guide unit, the connecting member has a second guide portion that engages with the first guide portion and a third guide portion that engages with the eccentric rotating member, 4. The lens device according to claim 3, wherein the eccentric rotation member has a fourth guide portion that engages with the third guide portion.

5. The lens device according to claim 4 , wherein the second guide portion and the third guide portion are arranged in directions intersecting each other.

6. 6. The lens device according to claim 3, further comprising an elastic member provided between the second focus adjustment unit and the eccentric rotation member.

7. a holding member that holds the first optical system and the second optical system, 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 the object side to the image 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; 2. The lens device according to claim 1, wherein a first coupling surface where the first optical system is coupled to the holding member and a second coupling surface where the second optical system is coupled to the holding member are perpendicular to a line connecting the first optical axis of the first optical system and the first optical axis of the second optical system.

8. 8. The lens apparatus according to claim 7, wherein the first coupling surface and the second coupling surface are parallel to the first optical axis and the third optical axis, respectively.

9. 9. The lens device according to claim 7, wherein the first coupling surface and the second coupling surface are each perpendicular to the second optical axis.

10. The first coupling surface and the second coupling surface are configured to couple the first optical axis and the third optical axis, respectively.

10. The lens device according to claim 7, wherein the lens device is disposed between the axis.

11. 11. The lens device according to claim 7, further comprising a circuit board disposed between the first coupling surface and the second coupling surface.

12. a holding member that holds the first optical system and the second optical system; a first biasing member that biases the first optical system and the second optical system against the holding member; 12. The lens device according to claim 1, further comprising a second biasing member that simultaneously biases the first optical system and the second optical system in a focus adjustment direction and in a direction perpendicular to the focus adjustment direction in the same plane.

13. a guide portion for guiding the optical system in the focus adjustment direction, The lens device according to claim 12 , wherein the guide portion comprises at least two bearings.

14. Let μ be the static friction coefficient between the first optical system and the holding member, and N be the normal force generated between the first optical system and the holding member, and N be the normal force generated between the first optical system and the holding member, and N be the normal force generated between the second optical system and the holding member, and N be the normal force generated between the first optical system and the holding member, and N be the normal force generated between the second optical system and the holding member, and N be the normal force generated between the second optical system and the holding member, and N be the normal force generated between the second optical system and the holding member, and N be the normal force generated between the second optical system and the holding member, and N be the normal force generated between the second optical system and the holding member, and N be the normal force generated between the second optical system and the holding member, and N be the normal force generated between the first ... μN+mg<k2x2 N = k1 x 1 14. The lens device according to claim 12, wherein the following condition is satisfied:

15. 15. The lens device according to claim 12, further comprising a third biasing member that biases the first optical system and the second optical system in the focus adjustment direction.

16. When the coefficient of static friction between the first optical system and the holding member and between the second optical system and the holding member is μ, the normal force generated between the first optical system and the holding member and between the second optical system and the holding member is N, the spring constant of the first urging member is k1, the displacement amount of the first urging member is x1, the spring constant of the second urging member is k2, the displacement amount of the second urging member is x2, the spring constant of the third urging member is k3, and the displacement amount of the third urging member is x3, μN+mg<k2x2+k3x3 N = k1 x 1 16. The lens device according to claim 15, wherein the following condition is satisfied:

17. The single imaging element; An imaging device comprising: a lens device according to claim 1 .

Images