JP7574164B2 - Lens device - Google Patents

Description

The present invention relates to a lens device and an imaging device.

Conventionally, interchangeable lenses for stereoscopic photography have been known as lens devices. For example, Patent Documents 1 and 2 disclose a lens device in which two optical systems are arranged in parallel, and two image circles are imaged in parallel on one imaging element. To capture an image with parallax, it is necessary to adjust the focus for each of the two optical systems. Therefore, for example, Patent Document 3 discloses binoculars in which the left and right diopter adjustment is performed by moving one of the optical systems, and the mechanism for moving both eyes for focus adjustment is switched with a single operating member.

JP 2012-3022 A JP 2012-113281 A JP 2009-175498 A

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. This makes the operation complicated and makes it difficult to perform proper focus adjustment due to incorrect operation.

The present invention aims to provide a lens device and an imaging device that can properly adjust the focus of multiple optical systems with simple operations.

A lens device according to one aspect of the present invention is a lens device that is detachably attached to a camera body, and includes a first optical system, a second optical system arranged in parallel with the first optical system, a lens mount for attachment to and detachment from the camera body having 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, and a second focus adjustment unit that adjusts a deviation in the relative focal positions of the first optical system and the second optical system, wherein the first focus adjustment unit is connected to both the first optical system and the second optical system, and the second focus adjustment unit is connected to only one of the first optical system or the second optical system.

Other objects and features of the present invention are described in the following embodiments.

The present invention provides a lens device and an imaging device that can properly adjust the focus of multiple optical systems with simple operations.

1 is a cross-sectional view of a lens device according to a first embodiment. FIG. 2 is an exploded perspective view of the lens device according to the first embodiment. FIG. 2 is an exploded perspective view of the lens device according to the first embodiment. 1 is a front view of a lens device according to a first embodiment. This is a cross-sectional view taken along line AA in FIG. This is a cross-sectional view taken along line AA in FIG. This is a cross-sectional view taken along the line B-B in FIG. 4 is a diagram showing the relationship between each optical axis and an image circle on an image sensor in the first embodiment. FIG. 5A and 5B are diagrams illustrating reflections of a second optical system when an image is captured by a first optical system according to the first embodiment. 1 is a schematic configuration diagram of an imaging apparatus according to a first embodiment. FIG. 13 is a schematic configuration diagram of an imaging device according to a second embodiment. FIG. 13 is a schematic configuration diagram of an imaging device according to a second embodiment. FIG. 11 is an exploded perspective view of a lens device according to a second embodiment. FIG. 11 is a schematic diagram of a first focus adjustment unit in the second embodiment. FIG. 11 is a top view of the vicinity of a lens top base in the second embodiment. FIG. 11 is a side view of the vicinity of the lens top base in the second embodiment. FIG. 13 is an exploded perspective view of a position adjustment mechanism according to a second embodiment. FIG. 13 is a side view of a position adjustment mechanism according to the second embodiment. 13 is an enlarged view of a position adjustment portion and a guide portion according to the second embodiment. FIG. FIG. 11 is a schematic diagram showing a load balance relationship in the second embodiment. FIG. 13 is an exploded perspective view of a second focus adjustment unit in the second embodiment. 13 is a cross-sectional view of a connection portion between a second focus adjustment portion and a right-eye optical system in a second embodiment. FIG. FIG. 11 is a perspective view showing a state in which an eccentric rotation member and a connecting member are connected in a second embodiment. 13 is a schematic diagram showing the positional relationship between an eccentric rotation member and a connecting member in the second embodiment. FIG. 13 is a side view showing the configuration of an optical system position adjustment mechanism in the third embodiment. FIG. 13 is an enlarged view of a position adjustment unit and a guide unit for an optical system according to a third embodiment. FIG.

The following describes in detail an embodiment of the present invention with reference to the drawings.

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, the image formed by the right optical system (the first optical system) is recorded as a video or still image for the right eye, and the 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 (video), the viewer can view it using a known 3D display or so-called VR goggles, so that the right eye image is projected on the viewer's right eye and the left eye image is projected on the viewer's left eye. At this time, the lens device's baseline length projects images with parallax on the right and left eyes, allowing the viewer to obtain a three-dimensional effect. In this way, the lens device of each embodiment is a lens device for stereoscopic photography (stereoscopic photography lens) that can form two images with parallax using the first optical system and the second optical system.

(First embodiment)
First, a lens device (interchangeable lens) 200 according to 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 will be described with a reference numeral suffixed with R, and the left-eye optical system will be described with a reference numeral suffixed with L. The reference numerals common to both the right-eye optical system and the left-eye optical system will not be described with a reference numeral suffixed with R or L.

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 curved optical system, and in each optical system, a first optical axis OA1, a second optical axis OA2 that is approximately perpendicular to the first optical axis OA1, and a third optical axis OA3 that is 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 that is convex toward 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 a third lens group 231, 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 beam of the first optical axis OA1 to the second optical axis OA2, and a second prism (second reflecting surface) 230 that bends the light beam of the second optical axis OA2 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).

The right eye optical system 201R and the left eye optical system 201L are fixed to the lens top base (holding member) 300 by tightening screws or the like. The lens top base 300 is fixed to the lens bottom base 301 by tightening screws or the like. The lens bottom base 301 is held so that it can move back and forth in the optical axis direction while movement in the rotational direction is restricted by a linear structure (not shown). This allows the right eye optical system 201R and the left eye optical system 201L to move back and forth 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.

Next, the first lens group 211 and its surrounding structure will be described with reference to Figures 4 to 7. Figure 4 is a front view of the lens device 200. Figures 5 and 6 are cross-sectional views taken along line A-A in Figure 4, showing the first lens group 211 of the lens device 200 and its surrounding structure. Figure 7 is a cross-sectional view taken along line B-B in Figure 4, showing the first lens group 211 of the lens device 200 and its surrounding structure.

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 with screws. 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.

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 with an effective angle of view of 180 degrees or more. The first lens group 211R, 211L has a lens surface 211A that is also the incident surface of the effective light beam on the subject side. 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.

A detailed description will be given with reference to Figures 4 and 7. As shown in Figure 4, the right eye region 20R is the side of the right eye optical system 201R from 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 the side of the left eye optical system 201L from the center between the right eye optical system 201R and the left eye optical system 201L. At this time, as shown in the angle of view FOV in Figure 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 moves away from the first lens group 211L so as not to block the outermost effective light beam (thick dotted line portion in Figure 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 moves away from the first lens group 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 group 211L of the left-eye optical system 201L and its periphery as seen from the right-eye optical system 201R, and the first lens group 211R of the right-eye optical system 201R and its periphery as seen from the left-eye optical system 201L, also have areas that block part of each other's effective light beam.

To form the opening 204F of the front exterior member 204, wall shapes 204C and 204D are provided which are more convex than the surface shapes 204A and 204B. The wall shape 204C is an arc shape approximately coaxial with the first lens group 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 approximately coaxial with the first lens group 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.

Next, the first lens group 211R, 211L that fits into the opening 204F of the front exterior member 204 and the surrounding configuration will be described. 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 with an opening 213A into which the first lens group 211R, 211L fit is arranged so as to cover the outer periphery of the subject-side lens surface 211A of the first lens group 211R, 211L.

The 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 the boundary between the side surface 211E of the first lens group 211R, 211L and the lens surface 211A. Or, as shown in FIG. 6, it may be the inner diameter tip of a crimp claw shape that crimps and fixes the first lens group 211R, 211L. The boundary 211D is the 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).

X=(ΦB-ΦA)/2...(1)
In this way, by covering the boundary 211D, it is expected that the appearance quality will be improved. The cover member 213 is positioned in the optical axis direction with respect to the 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 the cover member 213, the boundary 211C will not come to the inside of the opening 213A of the cover member 213 even if the cover member 213 moves toward the cover member 213 by the play.

5 and 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 outward. 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 configuration 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 backlash 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.

In this way, the cover member 213 is positioned relative to the lens holding member 212 in the optical axis direction, and can therefore move forward and backward in the optical axis direction together 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, any play in the radial fit is very small and is smaller than the predetermined play Y.

In addition, 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. 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 bayonet configuration described above 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 rotation restriction groove may be on the cover member 213, and the rotation restriction key may be on the front exterior member 204.

Cover member 213 has surface 213D facing the image surface, and lens holding member 212 has surface 212B facing the subject side opposite surface 213D. Optical axis direction seal member 214 for splash and dust protection is sandwiched between surface 213D and surface 212B. Surfaces 213D and 212B are preferably the entire circumference, but may be partial. By sandwiching optical axis direction seal member 214 in the optical axis direction, cover member 213 and lens holding member 212 are biased in the optical axis direction, and backlash in the optical axis direction can be reduced.

In addition, to maintain a predetermined backlash Y, the optical axis direction seal member 214 is arranged with a predetermined clearance larger than the backlash Y so as not to be pinched in the 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.

A radial seal member 215 for splash and dust protection is arranged 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 arranged in a position that blocks 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 arranged in a position that blocks the effective light beam of the right eye optical system 201R.

The above configuration makes it possible to capture stereoscopic images with a viewing angle of 180 degrees or more, while maintaining the appearance quality and dust-proof and water-resistant performance. By designing the lens holding member 212 so that it 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 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 when the front exterior member 204 is incorporated.

Figure 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 image sensor 111 on the camera body 110 side. On the image sensor 111 of the camera body 110, the right eye image circle ICR with an effective angle of view formed by the right eye optical system 201R and the 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 image sensor 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.

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 baseline length L1. The longer the baseline length L1, the greater the three-dimensional effect when viewed.

For example, the sensor size is 24 mm vertical x 36 mm horizontal, 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 width of an adult. The diameter ΦD of the lens mount section 202 may be shorter than the base length L1. Furthermore, by making the distance L2 between the third optical axes OA3R and OA3L shorter than the diameter ΦD of the lens mount section 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.

L1>ΦD>L2...(2)
When viewing in VR, it is said that the viewing angle that gives a stereoscopic effect is about 120 degrees, but since a viewing angle of 120 degrees leaves a sense of incongruity, the viewing angle is often widened to 180 degrees. Since the 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).

ΦD2>ΦD3...(3)
9 shows the reflection of the second optical system when the first optical system is used for imaging. The image is captured on the inside, but not at a 180-degree angle of view, and is captured 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. 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 covers The member 213 and the wall portion 204D are outside the image circle having a 180 degree angle of view. In addition, the reflection of the wall 204D is captured on the outside (left side in FIG. 9) even when viewed in the horizontal direction from the apex of the first lens group 211L. Since the image is captured outside the apex of the first lens group 211L when viewed in the horizontal direction, when the reflection of the adjacent lens is trimmed or cut out during image processing or editing, That is, in this case, as long as the lens is cut horizontally up to the apex of the first lens group 211L, which is necessarily reflected due to the specifications, for example, the lens is cut horizontally outside the line Z in FIG. In this case, the reflection of the wall portion 204D does not have any effect. Therefore, there is an advantage that the minimum necessary cut is sufficient. The above points are the same as those in the first optical system when the image is captured by the second optical system. The same applies to reflections in the optical system.

As described above, although the wall portion 204D is within the effective angle of view, it is positioned so that it has little effect on image capture for actual VR use.

Fig. 10 is a diagram showing an example of the schematic configuration of an imaging device 100 capable of capturing stereoscopic images. 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 configured as an integrated unit.

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 memory 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.

The image of the subject is formed on the image sensor 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. The image sensor 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 image sensor 111 into a digital electrical signal (image signal). The image processing unit 113 performs various image processing operations on the digital electrical signal (image signal) output from the A/D converter 112.

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 functions 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 units 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.

Second Embodiment
Next, a second embodiment will be described. Fig. 11 is a schematic diagram of an image capture device 100 in this embodiment. The image capture device 100 is configured to include a camera body (image capture 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 capture device 110 and used.

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.

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. In this embodiment, the right eye optical system 201R and the left eye optical system 201L are the same optical system, and are configured as a lens group with an integrated imaging optical system (image pickup optical system), so that focus adjustment can be performed by extending the entire optical system. As described above, the lens device 200 is intended to create parallax images. 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 in optical characteristics occurs between the left and right images, which may result in discomfort as the left and right images are parallax images.

In this embodiment, as described above, by extending the left and right optical systems as a whole, it is possible to reduce the difference in characteristics between the optical systems of the left and right lenses. 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 above and below rather than left and right.

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 with a slight tilt relative to the mount section 202.

Figure 12 is a schematic diagram of the imaging device 100, and shows the state in which the imaging element 111 is fixed with a slight tilt relative to the mount unit 202. In the manufacturing process of the lens device 200, the distance from the mount unit to the imaging positions of the right eye optical system 201R and the left eye optical system 201L, so-called flange back distance, can be adjusted. However, even if the difference between them is brought close to zero, the left and right optical systems do not necessarily reach the best focus 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 able to move in the axial direction perpendicular to the imaging surface, making it possible to adjust the relative focus positions of the left and right eyes.

On the other hand, adjusting the flange backs of the left and right optical systems each time a photograph is taken can result in missed photographing opportunities due to the time lost from the adjustment work, and the operation becomes cumbersome. To avoid this, it is necessary to enable quick and accurate focusing operation using 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 it in the 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 the axial direction perpendicular to the imaging element 110, and allows simultaneous focus adjustment while holding the left and right optical systems together. The first focus adjustment unit can be attached to the exterior cover member 203, allowing the user to operate it.

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 attached to the exterior cover member 203 and operated by the user. The second focus adjustment unit 500 adjusts the relative focus position deviation between the right eye optical system 201R and the left eye optical system 201L.

By operating these independently, the user can use the second focus adjustment unit 500 to adjust the flange backs of the left and right optical systems of the lens device 200 to match the inclination of the image sensor 111 of the imaging device 100 that the user owns. 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 on both optical systems simultaneously 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 the axial direction perpendicular to the image sensor.

Next, the 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.

The right-eye optical system 201R is held so as to be movable in a direction perpendicular to the image sensor 110 relative to the lens top base 300. 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 has cam follower portions 301a at three locations. When the cam follower portions 301a come into contact with the cam member 302 described below, it becomes possible to drive in a direction perpendicular to the image sensor 110. The cam member 302 is engaged and held by the exterior base member 303. In addition, the cam member 302 engages with the first focus adjustment portion (focus ring) 400 with the key portion 302a, so that when the user rotates the first focus adjustment portion 400, the cam member 302 connected to the inside of the lens device 200 can be rotated. In addition, the first focus adjustment unit 400 is sandwiched between the exterior member 303 and the cover member 304, so that it is held radially by the exterior member, and rotatably held axially 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 sensor 110, and the focus of the left and right optical systems can be adjusted.

Figure 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 screws 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 slope 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 a so-called diameter fitting state with the exterior member 303. 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.

The right eye optical system 201R is connected to the second focus adjustment unit 500 described below and driven in the 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 the 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 focus of both the left and right eyes together.

Next, the 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 Figures 15 and 16. Figure 15 is a top view of the vicinity of the lens top base 300. Figure 16 is a side view of the vicinity of the lens top base 300.

As in Figures 3 and 13, the right-eye optical system 201R and the left-eye optical system 201L are arranged to sandwich the lens top base 300. The base prism bottom 311L(R) constituting the left (right) eye optical system 201L(R) is configured to be attached to and detached from the lens top base 300 from the left and right directions on the paper. The lens top base 300 is arranged between the first optical axes OA1L(R) and is arranged so that the second optical axis OA2L(R) passes through it. If the lens top base 300 is arranged between the third optical axes OA3L(R), the spacing between the third optical axes OA3L(R) will become wider, and the lens will become so large that it will not be able to fit inside the mount.

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 the 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 the joining surface (second joining surface) 312L. The joining surface 312L(R) is arranged 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 also arranged parallel to the first optical axis OA1L(R) and the third optical axis OA3L(R), and is arranged between the first optical axis OA1L(R) and the third optical axis OA3L(R). This arrangement improves space efficiency and makes it possible to place the circuit board 310 between the two coupling surfaces 312L(R). The coupling surface 312L(R) is also arranged perpendicular to the second optical axis OA2L(R).

Next, the focus position adjustment mechanism that moves the right eye optical system 201R relative to the lens base top 300 will be described in detail with reference to Figs. 17 to 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.

As shown in Figures 17 and 18, the right eye optical system 201R is constantly biased in a predetermined direction (mounting 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 the coupling surface (first coupling surface) 312R, which is the mounting portion of the lens base top 300. The eccentric rotating member (position adjustment portion) 503 is rotatably attached to the lens base top 300 by the shoulder screw 504, and at the same time, the outer periphery of the eccentric rotating member is configured to fit into the hole portion 251 of the right eye optical system 201R.

19, the eccentric rotating member 503 has an outer shape center OZ2 eccentric with respect to the rotation center OZ1. When the eccentric rotating member 503 rotates, the right eye optical system 201R can be adjusted in the optical axis direction while sliding against 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 rotating 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. In addition, 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 rotating member 503. Specifically, the two rolling bearings (guide parts) 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 parts 252a, 252b, 253a, 253b of the guide holes 252, 253 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 (adjustment direction).

As shown in FIG. 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 arranged on either side of the optical axis of the right eye optical system 201R with respect to the eccentric rotating 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 eccentric rotating member 503 and the hole portion 251a of the right eye optical system 201R as the starting point. Due to the force of the second tension spring 508, the right eye optical system 201R does not rattle, and can move while being guided by the two rolling bearings 505a and 505b.

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 Figures 20 (a) and (b). Figures 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 (extension) is x1, the spring constant of the first tension spring 508 is k2, the displacement is x2, and the spring constant of the second tension spring 507 is k3, the displacement 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).

μN+mg<k2x2+k3x3...(4)
N=3×(k1x1)...(5)
In the absence of the second tension spring 507, it is preferable to satisfy the following conditional expressions (4a) and (5a): In the conditional expression (5a), N is the spring constant of the three compression springs 502a to 502c. It is the sum of.

μN+mg<k2x2...(4a)
N=k1x1...(5a)
Furthermore, when the second tension spring 507 is provided, it is preferable that the following conditional expressions (4b) and (5b) are satisfied. In the conditional expression (5b), N is the spring constant of the three compression springs 502a to 502c. It is the sum of.

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 with each other without rattling, regardless of the orientation of the lens device 200. The problem of the lens part of the right eye optical system 201R not following the adjustment of the core rotation member is eliminated. Similarly, the left eye optical system 201L is attached to the lens base top 300 in contact with the attachment surface 311L, and the right eye optical system 201R is attached to the lens base top 300 in contact with the attachment surface 311L. A similar adjustment mechanism is provided, and the adjustment operation described above enables the lens base top 300 to slide in a direction parallel to the optical axis.

The second focus adjustment unit, which will be described later, can be externally adjusted by the user by connecting it to the right-eye optical system 201R, but by configuring the left-eye optical system 201L to be adjustable during the assembly process of the lens device 200, it is possible to increase the degree of freedom in position adjustment during assembly. The right-eye optical system 201R and the left-eye optical system 201L are slidably attached to the lens base top 300, and since no other parts are used, relative left-right tilt and decentering are suppressed during focus adjustment. 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 this is not limited to this, and a bar member that guides linear movement may also be used.

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 the small base 521 and a retaining ring 523 attached to the tip of the adjustment pin 526, 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. The first guide portion 526a engages with the second guide portion 524a provided on the connecting member 524, thereby being held movably in a direction perpendicular to the axis of the adjustment pin 526.

Next, the connection between the second focus adjustment unit 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 between the second focus adjustment unit 500 and the right eye optical system 201R.

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 a third guide portion 524b on the side opposite 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 protrusion may be reversed. Also, the third guide portion 524b engages with the fourth guide portion 503a provided on the eccentric rotating member 503.

Here, the second guide portion 524a and the third guide portion 524b of the connecting member 524 are arranged in directions that intersect with each other. In this embodiment, the second guide portion 524a and the third guide portion 524b are provided in directions that are perpendicular to each other. Therefore, the direction in which the connecting member 524 can engage and move with respect 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 with respect to the eccentric rotation member 503 is a direction perpendicular to that. As a result, even if the positional relationship between the cover member 203 and the right eye optical system 201R changes due to 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.

The connection form when the first focus adjustment unit 400 and the second focus adjustment unit 500 are operated will be described later, but 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, when the eccentric rotation member 503 rotates, 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.

The eccentric rotating member 503 is biased against the base lens top 300 by a biasing spring 527 and a stopper pin 528, thereby providing a frictional holding force. This makes it possible to prevent the right eye optical system 201R from easily moving due to unintended impacts, etc. 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 may be configured to be connected to the second focus adjustment unit 500. In addition, the left and right optical systems may each be provided with a mechanism that allows the user to adjust the rotation of each optical system from the outside using an adjustment pin 526.

Next, the relationship between the eccentric rotating 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 rotating member 503 and the connecting member 524 connected to each other. As described above, the eccentric rotating member 524 has a 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 when engaged with the first guide portion 526a, so that it is supported movably in the X direction in FIG. 23. On the other hand, the third guide portion 524b is arranged on the opposing side in the axial direction of the second guide portion 524a and the adjustment pin 526, and is configured in a state in which the key portion extends 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 intersects with each other. This allows the connecting member 524 to move freely in the Y direction relative to the eccentric rotating member 503 and in the X direction relative to the adjustment pin 526.

Next, referring 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 with a thick line in FIG. 24 is a schematic representation of the eccentric rotation member 503. The circle shown with a thin line is the connecting member 524, and the second guide portion 524a provided on the connecting member 524 is shown with a thin line, and the third guide portion 524b is shown with a thin dotted line.

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 sensor 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 sensor 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.

The eccentric rotating 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 rotating 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. Also, if the rotation center point of the eccentric rotating 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, points A and B are in the same position.

Meanwhile, in states (1) and (2), point B is the center of rotation of the adjustment pin 526, so it always exists in the same position, while point A moves in the direction of arrow AX as it is driven by the first focus adjustment unit 400. The second guide portion 524a of the connecting member 524 is a groove extending in the X direction described above, and the first guide portion 526a of the adjustment pin 526 that engages with it is configured with a key shape that engages with the second guide portion 524a. Therefore, relative to the adjustment pin 526 that is rotatably fixed to the cover member 203, the connecting 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.

On the other hand, in the state (3), when the adjustment pin 526 is rotated from the neutral position and the first focus adjustment unit 400 is driven, the eccentric rotation member 503 is driven in the X direction by the drive of the first focus adjustment unit 400, and the connecting member 524 is driven. On the other hand, point B, which is the rotation center of the adjustment pin 526, is always in 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 must be on the X axis, which is the center line of the second guide groove. Since the connecting member 524 has a degree 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 by the connecting member 524. This allows the first focus adjustment unit 400 and the second focus adjustment unit 500 to be operated independently of each other.

Third Embodiment
Next, the 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 descriptions are omitted, and details are added for different configurations. 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.

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

The two rolling bearings 605a and 605b are simultaneously engaged with the linear guide portions 752a, 752b, 753a, and 753b of the guide holes 752 and 753 of the right-eye optical system 201R, and function as linear guide portions for the right-eye optical system 201R to move 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 due to 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 portion of the right-eye optical system 201R is improved. With the configuration described above, even if the adjustment unit is located away from the optical axis, it is possible to move the right eye optical system 201R as intended without rattling. In this embodiment, the eccentric rotating member 603 is located on the line connecting the centers of the two rolling bearings 605a and 605b, but it may be located on an extension of the line connecting the centers of the two rolling bearings 605a and 605b.

According to each embodiment, it is possible to provide a lens device and an imaging device that can appropriately adjust the focus of multiple optical systems with a simple operation.

The above describes preferred embodiments of the present invention, but the present invention is not limited to these embodiments, and various modifications and variations are possible within the scope of the gist of the invention.

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 (7)

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 adjusts the focus of 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,
the first focus adjustment unit is connected to both the first optical system and the second optical system,
The lens device, wherein the second focus adjustment unit is connected to only one of the first optical system and the second optical system. The lens device according to claim 1, characterized in that the first optical system and the second optical system are imaging optical systems constituted by the same optical system. 3. The lens device according to claim 1, wherein one of the first focus adjustment unit and the second focus adjustment unit does not move in a focus adjustment direction during focus adjustment. 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. 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,
5. The lens device according to claim 4 , wherein the eccentric rotation member has a fourth guide portion that engages with the third guide portion. The lens device according to claim 5 , wherein the second guide portion and the third guide portion are disposed in directions intersecting each other. 7. The lens device according to claim 4, further comprising an elastic member provided between the second focus adjustment unit and the eccentric rotation member.