Lens device and imaging apparatus

Abstract

To provide a compact lens device including a plurality of bending optical systems.SOLUTION: A lens device (200) includes a first optical system (201R), a second optical system (201L) arranged in parallel with the first optical system, and a first driving part (252) including an actuator for moving at least one of the first optical system and the second optical system. Each of the first optical system and the second optical system has a first optical axis, a second optical axis, and a third optical axis in order from an object side to an image side. A distance between the first optical axis of the first optical system and the first optical axis of the second optical system is longer than a distance between the third optical axis of the first optical system and the third optical axis of the second optical system. When viewed from a device top face, at least a part of the first driving part is arranged between the first optical axis of the first optical system and the first optical axis of the second optical system on a plane including the respective first optical axes of the first optical system and the second optical system.SELECTED DRAWING: Figure 7

Description

[Technical Field]

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

[0002] Conventionally, a lens device (stereoscopic imaging lens) has been known in which two optical systems (bending optical systems) are arranged in parallel, and two image circles are formed in parallel on one imaging element. To capture an image with parallax, it is necessary to perform focus adjustment for each of the two optical systems, and to correct the deviation in the focal positions of the two optical systems by driving one optical system. Patent Document 1 therefore discloses a lens device having a first focus adjustment unit that simultaneously performs focus adjustment for the two optical systems, and a second focus adjustment unit that adjusts the deviation in the relative focal positions of the two optical systems. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-37539 Summary of the Invention [Problem to be solved by the invention]

[0004] The lens device disclosed in Patent Document 1 has an actuator that drives either the left-eye optical system or the right-eye optical system, and an actuator that drives both the left-eye optical system and the right-eye optical system together, which makes the lens device larger.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a compact lens device equipped with a plurality of bending optical systems. [Means for solving the problem]

[0006] A lens device according to one aspect of the present invention comprises a first optical system, a second optical system arranged in parallel to the first optical system, and a first drive unit that drives at least one of the first optical system or the second optical system, wherein the first optical system and the second optical system each have a first optical axis, a second optical axis, and a third optical axis, in that order from the subject side to the image side, and at least a portion of the first drive unit is arranged between the first optical axis of the first optical system and the first optical axis of the second optical system on a plane including the first optical axes of the first optical system and the second optical system.

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

[0008] According to the present invention, it is possible to provide a compact lens device equipped with a plurality of bending optical systems. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view of a lens device according to a first embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the lens device according to the first embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the lens device according to the first embodiment. [Figure 4] FIG. 1 is a configuration diagram of an imaging device according to a first embodiment. [Figure 5] FIG. 2 is a diagram illustrating the layout of optical axes and image circles on an imaging element in the first embodiment. [Figure 6] FIG. 1 is a side view of a lens device according to a first embodiment. [Figure 7] 1 is a cross-sectional view of an imaging device according to a first embodiment. [Figure 8] FIG. 1 is a front view of a lens device according to a first embodiment. [Figure 9] FIG. 10 is a diagram illustrating the configuration of an imaging device according to a second embodiment. [Figure 10] FIG. 10 is a cross-sectional view of an imaging device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0011] (First embodiment) First, a lens device (interchangeable lens) 200 according to a first embodiment of the present invention will be described. The lens device 200 has two optical systems (a first optical system and a second optical system) arranged parallel to each other (symmetrically), and is configured so that two image circles are formed parallel to one another on an image sensor. The two optical systems are arranged horizontally, separated by a predetermined distance (base line length). When viewed from the image side, an image formed by the right optical system (the first optical system) is recorded as a moving or still image for the right eye, and an image formed by the left optical system (the second optical system) is recorded as a moving or still image for the left eye.

[0012] When a video or still image (image) is played back, the user (viewer) views it using a known 3D display or so-called VR goggles, whereby a right-eye image is projected onto the right eye and a left-eye image is projected onto the left eye. At this time, due to the base length (first optical axis distance L1) of the lens device, images with parallax are projected onto the right and left eyes, allowing the user to experience a sense of three-dimensionality. Thus, the lens device 200 of this embodiment is a stereoscopic imaging lens device (stereoscopic imaging lens) capable of forming two images with parallax using the first optical system and the second optical system.

[0013] The lens device 200 will be described with reference to Figs. 1 to 3. Fig. 1 is a cross-sectional view showing a schematic configuration of a right-eye optical system 201R and a left-eye optical system 201L of the lens device 200. 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 suffix R, and the left-eye optical system will be described with a suffix L. The description common to both the right-eye optical system and the left-eye optical system will not have a suffix R or L.

[0014] 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 so-called bent optical systems having a plurality of orthogonal optical axes. The right-eye optical system 201R and the left-eye optical system 201L each have, in order from the subject side to the image side (imaging surface side), a first optical axis OA1, a second optical axis OA2 that is substantially orthogonal to the first optical axis OA1, and a third optical axis OA3 that is substantially parallel to the first optical axis.

[0015] Along each optical axis, a first lens (first lens) 211 having a surface 211A convex toward the subject is arranged on the first optical axis OA1, a second lens (second lens) 221 is arranged on the second optical axis OA2, and third lens (third lens) 231, 231-2 is arranged on the third optical axis OA3. The third lens groups 231, 231-2 are provided inside the lens mount 202.

[0016] The right-eye optical system 201R and the left-eye optical system 201L each have a first prism 220 that bends the light beam of the first optical axis OA1 and guides it to the second optical axis OA2, and a second prism 230 that bends the light beam of the second optical axis OA2 and guides it to the third optical axis OA3. As such, the right-eye optical system 201R and the left-eye optical system 201L are each bending optical systems that bend the incident light beam twice. Note that the optical axis direction refers to the direction of the first optical axis OA1, which extends from the subject side to the image side.

[0017] The left-eye optical system 201L is fixed to the lens top base (base member) 300 with screws or the like. On the other hand, the right-eye optical system 201R is held so as to be freely movable in the optical axis direction relative to the lens top base 300 by a configuration described below. The lens bottom base 301 is held so as to be able to move back and forth in the optical axis direction while movement in the rotational direction is restricted by a linear structure (not shown). With this configuration, the right-eye optical system 201R and the left-eye optical system 201L can move back and forth in the optical axis direction together. This allows the focus positions of the right-eye optical system 201R and the left-eye optical system 201L to be adjusted simultaneously.

[0018] 1 to 3, 203 denotes an exterior cover member, 204 denotes a front exterior member, 212 denotes a first lens group holding member, 213 denotes a cover member, 214 denotes an optical axis direction sealing member, and 215 denotes a radial direction sealing member.

[0019] 4 is a schematic diagram of an imaging device 100 capable of capturing stereoscopic images. The imaging device 100 has a camera body 110 and a lens device 200. The lens device 200 is an interchangeable lens that can be attached to and detached from the camera body 110. However, the present 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.

[0020] The lens device 200 has a right-eye optical system 201R and a left-eye optical system 201L that constitute an imaging optical system, and forms two images with parallax on the imaging element 111 of the camera body 110. The lens device 200 also has a lens mount (lens mount portion) 202 for detachably mounting on the camera body 110.

[0021] The camera body 110 has an image sensor 111, an A / D conversion unit 112, an image processing unit 113, a display unit 114, an operation unit 115, a recording unit 116, a system control unit 117, a storage unit 118, 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 system control unit 117 and the lens control unit 250 are electrically connected.

[0022] 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 formed side by side on the image sensor 111. The image sensor 111 is a photoelectric conversion element such as a CMOS (Complementary Metal-Oxide-Semiconductor) sensor, and converts the formed image (optical signal) of the subject into an analog electrical signal. In this embodiment, the image sensor 111 is a single image sensor that forms a first image formed by the right-eye optical system 201R and a second image formed by the left-eye optical system 201L in parallel.

[0023] The A / D conversion unit 112 converts the analog electric signal output from the imaging element 111 into a digital electric signal (image signal). The image processing unit 113 performs various image processing on the digital electric signal (image signal) output from the A / D conversion unit 112.

[0024] The display unit 114 displays various types of information. The display unit 114 is realized by using, for example, an electronic viewfinder or a liquid crystal panel. The operation unit 115 functions as a user interface that enables the user to give instructions to the imaging device 100. If the display unit 114 has a touch panel, the touch panel also constitutes part of the operation unit 115. The recording unit 116 records various types of data, such as image data that has been subjected to image processing by the image processing unit 113, on a medium.

[0025] The system control unit 117 performs overall control of the entire imaging device 100. The system control unit 117 is realized by using, for example, a CPU. Meanwhile, light captured by the imaging optical system forms an image on the imaging element 111. In general, the formed image is captured by the imaging element 111, and after various processes are performed by the A / D conversion unit 112 or the image processing unit 113, it is configured as a captured image and written to a recording medium by the recording unit 116. The storage unit 118 stores, for example, programs and parameters executed by the system control unit 117.

[0026] The focal position calculation unit 119 is responsible for calculating and detecting the amount of focus deviation from the subject from the image captured by the image sensor 111 via the lens device 200. The images captured by the image sensor 111 are captured by the right-eye optical system 201R and the left-eye optical system 201L. As described above, these images have parallax for stereoscopic vision. From the parallax between these two images, it is possible to calculate the distance to each subject in the captured image. It is also possible to calculate the subject distance from each of the left and right images captured by the image sensor 111, but this method is well known and will not be described in detail here.

[0027] The system control unit 117 issues a lens drive command to the lens control unit 250 in accordance with the amount of focus deviation calculated by the focal position calculation unit 119. The lens control unit 250 controls the optical system drive unit in accordance with the lens drive command.

[0028] The right-eye optical system driving unit (first driving unit) 252 has a first actuator 540 (described later) and drives the right-eye optical system 201R. The right-eye optical system driving unit 252 is provided on the lens top base 300, and the right-eye optical system 201R is movable relative to the lens top base 300. The left-right eye optical system driving unit (second driving unit) 251 has a second actuator 400 (described later) and drives the right-eye optical system 201R and the left-eye optical system 201L together. For example, when the right-eye optical system 201R and the left-eye optical system 201L are relatively out of focus, a driving command is given to the right-eye optical system driving unit 252 to match the focal position of the fixed left-eye optical system 201L, thereby driving the right-eye optical system 201R.

[0029] When the right eye optical system 201R and the left eye optical system 201L are not focused on the subject distance intended by the user and the relative defocus amount between the right eye optical system 201R and the left eye optical system 201L is within a predetermined amount, the focal position calculation unit 119 calculates the defocus amount. Then, the system control unit 117 calculates a command to be given to the lens control unit 250. The lens control unit 250, which has received the command from the system control unit 117, gives a drive command to the right and left eye optical system drive unit 251, thereby driving the right eye optical system 201R and the left eye optical system 201L together and focusing on the subject distance intended by the user.

[0030] The lens device 200 has a first operation unit 253 and a second operation unit 254. The user can arbitrarily change the focus position for the subject distance intended by the user by operating the first operation unit 253. The lens control unit 250 reads the amount of operation of the first operation unit 253 by the user, and provides the left and right eye optical system drive unit 251 with a drive amount corresponding to the amount of operation.

[0031] On the other hand, when the user operates the second operation unit 254, the lens control unit 250 reads the amount of operation and sends a drive amount command to the right eye optical system drive unit 252. The right eye optical system drive unit 252 drives the right eye optical system 201R according to the drive amount. With this configuration, the right eye optical system 201R and the left eye optical system 201L can each perform a focusing operation as intended by the user.

[0032] 5 is a diagram showing the positional relationship between the optical axes, lens mount, camera mount, and image circle of the lens device 200. 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 parallel images on the imaging element 111. ΦD is the mount fitting diameter of the camera mount 122 and the lens mount 202.

[0033] It is preferable to set the size (diameter) ΦD2 of each image circle and the distance between the image circles so that the right-eye image circle ICR and the left-eye image circle ICL do not overlap each other. The distance between the image circles is the distance between the center of the right-eye image circle ICR and the center of the left-eye image circle ICL (the third optical axis distance L2). For example, consider a region 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 located approximately in the center of the right region of the light receiving range, and set the center of the left-eye image circle ICL to be located approximately in the center of the left region of the light receiving range. This configuration makes it possible to obtain the images captured by the right-eye optical system 201R and the left-eye optical system 201L using a single image sensor 111.

[0034] For example, if two imaging elements are provided and the images formed by the right eye optical system 201R and the left eye optical system 201L are captured by the two imaging elements, variations in the imaging elements may result in the two images obtained having different brightness or color.

[0035] On the other hand, in this embodiment, by capturing images from two optical systems with a single image sensor 111, it is possible to obtain images with small differences in brightness or color. Also, to avoid an increase in the size of the imaging device, the image circles of the two optical systems are arranged close to each other (adjacent to each other), thereby making it possible to perform imaging by making the most of the area of ​​the image sensor 111. Note that, since the distance between the image circles of the two optical systems (third inter-optical axis distance L2) becomes short, there is a shortage of space for arranging a drive unit, etc., which will be described later, in this embodiment, the drive unit is arranged as will be described later.

[0036] Next, a method for adjusting the relative focal position deviation between the right-eye optical system 201R and the left-eye optical system 201L will be described with reference to Fig. 6. Fig. 6 is a side view of the lens device 200, showing the assembled state of only the lens top base 300 and the right-eye optical system 201R.

[0037] In this embodiment, the left eye optical system 201L is fixed to the lens top base (base member) 300 by screws 530. That is, the left eye optical system 201L is held by set screws 530a, 530b, and 530c with a clearance in the depth direction of the page.

[0038] On the other hand, the right-eye optical system 201R is held so as to be movable relative to the lens top base 300. That is, the right-eye optical system 201R is held so as to be movable in the left-right direction on the paper by two guide rollers 501a and 501b. The right-eye optical system 201R is also positioned in the left-right direction on the paper by an eccentric collar 532. When the eccentric collar 532 rotates, the position of a contact portion 533a that contacts a holding frame 533 that holds the right-eye optical system 201R shifts in the left-right direction on the paper. The right-eye optical system 201R and the lens top base 300 are biased by a spring 531, and are constantly in contact with the contact portion 533a, thereby maintaining their positions with high precision.

[0039] 7 is a cross-sectional view of the imaging device 100, showing in detail the drive unit (drive mechanism) of the right-eye optical system 201R in the lens device 200. The lens top base 300 forms a gear train to integrally drive the right-eye optical system 201R. In this embodiment, the right-eye optical system 201R does not drive only some of the lenses that make up the right-eye optical system 201R, but instead drives all of the lenses that make up the right-eye optical system 201R as a whole.

[0040] Unlike the present embodiment, if only some of the lenses are moved, the focal length of the optical system changes slightly, which may result in a difference in the size of the images captured by each optical system. As a result, when a user views a captured image with their left and right eyes, the image projected to the right and left may differ, which may cause an uncomfortable feeling in the stereoscopic effect.

[0041] According to the configuration of this embodiment, when the focal positions of the right eye optical system 201R and the left eye optical system 201L are adjusted due to manufacturing errors, it is possible to prevent a difference in the size of the images formed by the right eye optical system 201R and the left eye optical system 201L.

[0042] Driving the entire right-eye optical system 201R as a whole requires a larger driving force than driving only a part of the optical system due to the increased mass of the driving unit. For this reason, in this embodiment, a deceleration configuration using a gear train is used to increase the torque of the actuator, thereby enabling the entire right-eye optical system 201R to be driven.

[0043] In Fig. 7, 540 denotes a first actuator serving as a drive source in a first drive unit (first drive mechanism) that drives the right-eye optical system 201R. The first actuator 540 receives a command from the lens control unit 250 and performs rotational drive. When the first actuator 540 rotates, a reduction gear 541 connected as one element that constitutes the first drive unit rotates. In this embodiment, the reduction gear 541 is a single-stage reduction gear, but is not limited to this, and various configurations are applicable, such as providing multiple stages or using a worm gear.

[0044] A driving force for the right-eye optical system 201R is generated by connecting the reduction gear 541 to the decentering collar 532. The decentering collar 532 includes a gear portion 532a that contacts the rotation axis of the gear portion that is connected to the reduction gear 541, and an eccentric portion 532b that has an axis that is eccentric to the axis of the gear portion 532a and contacts the right-eye optical system 201R. The eccentric collar 532 is rotated by torque transmitted using the above-mentioned gear train, and the eccentric portion 532b rotates, allowing the right-eye optical system 201R to move freely in the left-right direction (optical axis direction) in FIG.

[0045] Reference numeral 400 denotes a second actuator constituting a second drive unit (second drive mechanism) that integrally drives the right-eye optical system 201R and the left-eye optical system 201L. Similarly, the second actuator 400 requires a large torque to drive the two optical systems integrally, so a large torque is generated in a small actuator via a gear train. The gear train is connected to a cylindrical cam member 430 provided with a gear portion. A cam groove 430a into which a cam follower 431 is inserted is formed in the cam member 430. The cam member 430 rotates around the central axis of the cylinder as the rotation axis due to the torque transmitted from the gear train. As a result, the cam follower 431 abutting the cam groove can move in the left-right direction in FIG. 7.

[0046] The cam follower 431 is connected to the lens bottom base 301. Because the lens bottom base 301 is held integrally with the cam follower 431, the lens bottom base 301 also moves in accordance with the movement of the cam follower 431. The lens bottom base 301 and the lens top base 300 are fixed integrally. Therefore, the left-eye optical system 201L fixed to the lens top base 300 and the right-eye optical system 201R held movably relative to the lens top base 300 can be driven integrally.

[0047] Here, the second actuator 400 and part of the gear train (at least part of the second drive unit) are arranged in an area closer to the image side than the second optical axis OA2 (on the image sensor 111 side relative to the second optical axis OA2).

[0048] In order to obtain a natural three-dimensional effect, the spacing between the first optical axes OA1 (first optical axis distance L1) is set to the same distance as the human interpupillary distance. On the other hand, the spacing between the third optical axes OA3 (third optical axis distance L2) is determined by the width of the image sensor 111, and therefore the image sensor 100 of this embodiment is configured with its optical axes bent in a crank shape. Furthermore, the image sensor 111 is generally configured with a size smaller than the general interpupillary distance of a human. For this reason, the spacing between the first optical axes OA1 is set to be wider than the spacing between the third optical axes OA3. In this way, by arranging the second actuator 400 and part of the gear train in the space, it is possible to achieve a compact lens device 200 (image sensor 100).

[0049] By driving the entire right-eye optical system 201R, the imaging device 100 of this embodiment can reduce fluctuations in image magnification and the difference in image magnification between the two optical systems. On the other hand, a large torque is required to drive the optical systems, which have a large mass, as a whole. For this reason, this embodiment requires a configuration that generates a large driving force, including a gear train, as described above. Furthermore, this embodiment can integrally capture images from the two optical systems into the imaging element 111 and perform image processing. This makes it possible to realize a configuration that is less likely to produce differences between left and right images.

[0050] On the other hand, by configuring the lens device 200 so that the distance between the two optical systems (third optical axis distance L2) is small to form images from the two optical systems within the effective area of ​​the image sensor 111, it is possible to reduce the size of the lens device 200. Furthermore, when a human views an image with left-right parallax, capturing an image with a parallax of approximately 60 mm, which is close to the interpupillary distance of a human, allows the viewer to view a natural, three-dimensional image. Therefore, the distance between the first optical axes OA1R and OA1L of the two optical systems is set to approximately 60 mm. Meanwhile, the distance between the third optical axes OA3R and OA3L of the two optical systems is shorter than the 36 mm width of a typical image sensor 111. Therefore, the difference in distance is realized by bending the optical axes using a reflective optical element such as a mirror or a prism.

[0051] In this embodiment, second optical axes OA2R and OA2L are provided to connect the first optical axes OA1R and OA1L and the third optical axes OA3R and OA3L. Furthermore, the third optical axes OA3R and OA3L are arranged so that the two image circles are adjacent to each other in order to effectively utilize the area of ​​the image sensor 111. For this reason, it is preferable that the rearmost lens diameters are arranged close to each other (adjacent) in order to reduce the distance between the two image circles and to capture as much light as possible into the effective areas of the image circles.

[0052] On the other hand, for the reasons described above, the distance between the first optical axes OA1R and OA1L is greater than the distance between the third optical axes OA3R and OA3L. For this reason, in this embodiment, the gear train of the right-eye optical system drive unit 252 is disposed between the two first optical axes OA1R and OA1L on a plane (first plane) including the two first optical axes OA1R and OA1L. This eliminates the need to dispose space for a gear train including multiple stages of gears configured to generate large torque in an area outside the optical system.

[0053] Furthermore, in order to make the lens device 200 compact and reduce its overall length, the second optical axes OA2R and OA2L are arranged close to the image sensor 111, thereby enabling downsizing. Therefore, the gear train of the right-eye optical system driving unit 252 is arranged in an area on the subject side on the first plane with respect to the second optical axes OA2R and OA2L, thereby enabling downsizing.

[0054] In this embodiment, on a first plane including the first optical axes OA1R and OA1L of the two optical systems, the region between the first optical axes OA1R and OA1L (the region sandwiched between the first optical axes OA1R and OA1L) is defined as the first region. More specifically, the first region is the region on the first plane between the first optical axes OA1R and OA1L and closer to the subject than the second optical axes OA2R and OA2L.

[0055] In this embodiment, at least a part of the right eye optical system driving unit 252 including the first actuator 540 is arranged in the first region. On the other hand, at least a part of the left and right eye optical system driving unit 251 including the second actuator 400 is arranged in a region different from the first region, that is, on the image side of the second optical axis on the first plane.

[0056] Next, the arrangement of the first actuator 540 and the gear train will be described with reference to Fig. 8. Fig. 8 is a front view of the lens device 200 (viewed from the direction along the first optical axes OA1R and OA1L), showing the assembled state of the right-eye optical system 201R, the left-eye optical system 201L and the lens top base 300 as seen from the subject side.

[0057] Here, Line 1 and Line 2 are two tangent lines that contact the optical element (first lens 211) that is arranged closest to the subject among the optical elements that make up the right-eye optical system 201R and the left-eye optical system 201L. That is, when viewed from the direction along the first optical axes OA1R and OA1L, the tangent lines Line 1 and Line 2 are two tangent lines that connect points on the outer peripheries of the two optical elements (first lens 211) that are arranged closest to the subject in the right-eye optical system 201R and the left-eye optical system 201L. Furthermore, the tangent lines Line 1 and Line 2 are each parallel to a line that connects 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.

[0058] As described above, in order to ensure a wide imaging area, the forefront optical element (first lens group 211) tends to be large. Therefore, in this embodiment, in order to reduce the size of the lens device 200, the first actuator 540 and the gear train (at least a part of the first drive unit) are arranged in the area sandwiched between the tangent lines Line 1 and Line 2 (between the two tangent lines Line 1 and Line 2). This makes it possible to reduce the size of the lens device 200.

[0059] In this embodiment, the right-eye optical system 201R and the left-eye optical system 201L are each held by a lens top base 300 serving as a base member. As described above, the right-eye optical system 201R is movably supported, and the left-eye optical system 201L is fixedly supported. The lens top base 300 is disposed in a region between the first optical axis and the second optical axis, close to the lens on the subject side, which tends to have a large mass, to hold the two optical systems. This makes it possible to hold the two optical systems while ensuring good center-of-gravity balance. Furthermore, by disposing the first actuator 540 or a gear train in a partial region of the lens top base 300, it is possible to achieve a compact lens device 200.

[0060] (Second embodiment) Next, a second embodiment of the present invention will be described. Fig. 9 is a configuration diagram of an image capture device 100a in this embodiment. The image capture device 100a has a camera body 110 and a lens device (interchangeable lens) 200a. The basic configuration of the camera body 110 is the same as in the first embodiment, so a description thereof will be omitted. The lens device 200a has a right-eye optical system 201R and a left-eye optical system 201L that constitute an image capture optical system. In this embodiment, the right-eye optical system 201R and the left-eye optical system 201L can each be driven independently during a focusing operation.

[0061] The right-eye optical system driving unit (first driving unit) 252 has a first actuator 540 and is a driving unit that independently drives the right-eye optical system 201R. On the other hand, the left-eye optical system driving unit (second driving unit) 255 has a second actuator 400 and is a driving unit that independently drives the left-eye optical system 201L. As in the first embodiment, when the user operates the first operation unit 222 or the second operation unit 223, the lens control unit 250 transmits the driving amount of the right-eye optical system 201R or the left-eye optical system 201L corresponding to the amount of operation by the user to the right-eye optical system driving unit 252 or the left-eye optical system driving unit 255.

[0062] In this case, a command for the movement amount by operating the first operation unit 222 is treated as a command to integrally drive the right-eye optical system 201R and the left-eye optical system 201L, and a command for the movement amount by operating the second operation unit 223 is treated as a command to drive only the right-eye optical system 201R. By driving each of the two optical systems in this manner, it is possible to achieve relative focus deviation between the two optical systems and focus adjustment according to the subject distance by operating the first operation unit 222 and the second operation unit 223. Furthermore, a configuration for movably holding each of the right-eye optical system 201R and the left-eye optical system 201L can be realized, for example, as follows. That is, this can be realized by applying, to each of the right-eye optical system driving unit 252 and the left-eye optical system driving unit 255, the configuration for movably holding the right-eye optical system 201R relative to the lens top base 300 described with reference to FIG. 6.

[0063] FIG. 10 is a cross-sectional view of the imaging device 100a. As described above, the right-eye optical system 201R and the left-eye optical system 201L are held so as to be freely movable relative to the lens top base 300 in directions along the first optical axes OA1R and OA1L, respectively. In this embodiment, the lens top base 300 is directly fixed to a mount member or other base member connected to the camera body 110. Therefore, the right-eye optical system 201R and the left-eye optical system 201L are movably supported relative to the fixed lens top base 300. In this embodiment, the first actuator 540 and gear train constituting the first drive unit, and the second actuator 400 and gear train constituting the second drive unit, are each disposed in the first region. Therefore, according to this embodiment, it is possible to achieve a compact lens device 200a (imaging device 100a).

[0064] According to each embodiment, it is possible to provide a small-sized lens device and an imaging device equipped with a plurality of bending optical systems.

[0065] The disclosure of each embodiment includes the following configuration. (Configuration 1) a first optical system; a second optical system arranged in parallel with the first optical system; a first driving unit that drives at least one of the first optical system or the second optical system, the first optical system and the second optical system each have, in order from the object side to the image side, a first optical axis, a second optical axis, and a third optical axis; A lens device characterized in that at least a portion of the first driving unit is arranged between the first optical axis of the first optical system and the first optical axis of the second optical system on a plane including the first optical axes of the first optical system and the second optical system. (Configuration 2) 2. The lens device according to configuration 1, wherein at least the portion of the first driving section is disposed on the plane closer to the subject than the second optical axis. (Configuration 3) 3. The lens device according to claim 1, wherein the first driving section includes a first actuator. (Configuration 4) The lens device described in any one of configurations 1 to 3, wherein the first driving unit drives at least one of the first optical system or the second optical system so as to adjust a deviation in the relative focal position between the first optical system and the second optical system. (Configuration 5) 5. The lens device according to any one of configurations 1 to 4, further comprising a second drive unit that drives the first optical system and the second optical system integrally. (Configuration 6) 6. The lens device according to configuration 5, wherein the second driving section includes a second actuator. (Configuration 7) The lens device according to configuration 5 or 6, wherein the second drive unit is disposed on the plane closer to the image side than the second optical axis. (Configuration 8) 4. The lens device according to any one of configurations 1 to 3, further comprising a second drive unit that drives the other of the first optical system and the second optical system. (Configuration 9) The lens device described in configuration 8, wherein the second drive unit is disposed on the plane between the first optical axis of the first optical system and the first optical axis of the second optical system. (Configuration 10) The lens device described in any one of configurations 1 to 9, characterized in that at least a portion of the first drive unit, when viewed from a direction along the first optical axis, is parallel to a line connecting the first optical axis of the first optical system and the first optical axis of the second optical system, and is arranged between two tangents connecting points on the outer circumferences of two optical elements of the first optical system and the second optical system that are arranged closest to the subject. (Configuration 11) a base member that holds the first optical system and the second optical system; At least one of the first optical system and the second optical system is movable relative to the base member; 11. The lens device according to any one of configurations 1 to 10, wherein the first driving section is provided on the base member. (Configuration 12) 12. The lens device according to any one of configurations 1 to 11, wherein each of the first optical system and the second optical system has a first lens on the first optical axis, a second lens on the second optical axis, and a third lens on the third optical axis. (Configuration 13) 13. The lens device according to any one of configurations 1 to 12, wherein the first optical system and the second optical system are each a bending optical system that folds an incident light beam twice. (Configuration 14) 14. The lens device according to any one of configurations 1 to 13, wherein the second optical axis is perpendicular to the first optical axis. (Configuration 15) 15. The lens device according to any one of configurations 1 to 14, wherein the third optical axis is parallel to the first optical axis. (Configuration 16) 16. The lens device according to any one of configurations 1 to 15, further comprising a lens mount portion for detachably mounting on a camera body having an imaging element. (Configuration 17) The lens device described in configuration 16, characterized in that in each of the first optical system and the second optical system, the lens arranged on the third optical axis is provided inside the lens mount portion. (Configuration 18) An imaging element; An imaging device comprising: a lens device according to any one of configurations 1 to 17. (Configuration 19) The imaging device described in configuration 18, characterized in that the imaging element is a single imaging element that forms a first image formed by the first optical system and a second image formed by the second optical system in parallel.

[0066] 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]

[0067] 200 Lens Device 201R Right eye optical system (1st optical system) 201L Left eye optical system (second optical system) 251 Right and left eye optical system drive unit (second drive unit) 252 Right eye optical system drive unit (first drive unit) 255 Left eye optical system drive unit (second drive unit) OA1R, OA1L First optical axis OA2R, OA2L Second optical axis OA3R, OA3L 3rd optical axis

Claims

1. a first optical system; and a second optical system arranged in parallel with the first optical system; a first driving unit that drives at least one of the first optical system or the second optical system, the first optical system and the second optical system each have, in order from the object side to the image side, a first optical axis, a second optical axis, and a third optical axis; A lens device characterized in that at least a portion of the first driving unit is arranged between the first optical axis of the first optical system and the first optical axis of the second optical system on a plane including the first optical axes of the first optical system and the second optical system.

2. 2. The lens device according to claim 1, wherein at least the portion of the first driving section is disposed on the plane closer to the subject than the second optical axis.

3. 3. The lens device according to claim 1, wherein the first driving section includes a first actuator.

4. 3. The lens device according to claim 1, wherein the first driving unit drives at least one of the first optical system and the second optical system so as to adjust a deviation in relative focal positions between the first optical system and the second optical system.

5. 3. The lens device according to claim 1, further comprising a second drive unit that drives the first optical system and the second optical system integrally.

6. The lens device according to claim 5 , wherein the second driving section includes a second actuator.

7. The lens device according to claim 5 , wherein the second driving section is disposed on the plane closer to the image side than the second optical axis.

8. 3. The lens device according to claim 1, further comprising a second driving section that drives the other of the first optical system and the second optical system.

9. 9. The lens device according to claim 8, wherein the second driving unit is disposed on the plane between the first optical axis of the first optical system and the first optical axis of the second optical system.

10. The lens device described in claim 1 or 2, characterized in that at least a portion of the first driving unit, when viewed from a direction along the first optical axis, is parallel to a line connecting the first optical axis of the first optical system and the first optical axis of the second optical system, and is arranged between two tangents connecting points on the outer peripheries of two optical elements of each of the first optical system and the second optical system that are arranged closest to the subject.

11. a base member that holds the first optical system and the second optical system; At least one of the first optical system and the second optical system is movable relative to the base member, 3. The lens device according to claim 1, wherein the first driving section is provided on the base member.

12. 3. The lens device according to claim 1, wherein each of the first optical system and the second optical system includes a first lens on the first optical axis, a second lens on the second optical axis, and a third lens on the third optical axis.

13. 3. The lens device according to claim 1, wherein the first optical system and the second optical system are each a bending optical system that refracts an incident light beam twice.

14. 3. The lens device according to claim 1, wherein the second optical axis is perpendicular to the first optical axis.

15. 3. The lens device according to claim 1, wherein the third optical axis is parallel to the first optical axis.

16. 3. The lens device according to claim 1, further comprising a lens mount portion for detachably mounting the lens device on a camera body having an image sensor.

17. 17. The lens device according to claim 16, wherein in each of the first optical system and the second optical system, the lens arranged on the third optical axis is provided inside the lens mount portion.

18. An imaging element; An imaging device comprising: the lens device according to claim 1 or 2.

19. 19. The imaging device according to claim 18, wherein the imaging element is a single imaging element that forms a first image formed by the first optical system and a second image formed by the second optical system in parallel.

Images