Lens device and imaging apparatus

Abstract

To provide a lens device that can prevent left and right optical systems from going out of focus even when energization of a driving unit, which is for electrically driving an optical system for performing relative focus adjustment of the left and right optical systems, is turned off.SOLUTION: A lens device can be mounted on an imaging apparatus and has a plurality of lenses, and comprises: a first optical system; a second optical system; a driving unit for electrically driving the first optical system for performing relative focus adjustment of both optical systems; and a holding mechanism that holds the first optical system to prevent it from moving even when energization of the driving unit is turned off.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Interchangeable lenses for stereoscopic imaging have been well known as lens devices. For example, Patent Documents 1 and 2 disclose lens devices in which two optical systems are arranged in parallel, with two image circles formed in parallel on one of the image sensors. To capture images with parallax, it is necessary to adjust the focus of each of the two optical systems. Patent Document 3, for example, discloses binoculars in which a single operating member is used to switch between mechanisms for adjusting the left and right diopters, moving one optical system, and adjusting the focus to move both eyes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-3022 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-113281 [Patent Document 3] Japanese Patent Application Laid-Open No. 2009-175498 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the binoculars disclosed in Patent Document 3, the focus adjustment of the left and right optical systems and the relative focus adjustment must be performed by switching between the same operating members. This makes the operation cumbersome, making it difficult to perform proper focus adjustment due to erroneous operation. Furthermore, there is a risk of the relative focus of the left and right optical systems being shifted due to impact, etc. As such, it is important for the left and right lenses in a twin-lens system to be in focus, and a process for adjusting the focus difference between the left and right lenses is included in the manufacturing process. However, since a focus difference between the left and right lenses occurs during manufacturing, to resolve this, an adjustment mechanism for one lens is installed relative to the other lens. For example, fine adjustments are performed using tools such as hex wrenches, but this has the following problems. For example, if the right optical system is subjected to impact due to static pressure or a fall, the adjusted focus between the left and right lenses may shift, requiring readjustment, or the user may not notice the focus difference and take unintended images.

[0005] The present invention aims to provide a lens device and an imaging device that can prevent focus shifts even when power is turned off to a drive unit that electrically adjusts the relative focus of both optical systems. [Means for solving the problem]

[0006] One aspect of the present invention for achieving the above-mentioned object is a lens device having a plurality of lenses that is detachable from an imaging device, characterized in that it comprises a first optical system, a second optical system, a drive unit for electrically driving the first optical system to adjust the relative focus of the two optical systems, and a holding mechanism for holding the first optical system so as not to move even when power to the drive unit is turned off. [Effects of the Invention]

[0007] According to the present invention, it is possible to obtain the effect that it is possible to prevent the focus from going out of focus even when the power supply to the drive unit for electrically adjusting the relative focus of both optical systems is turned off. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a lens device according to an embodiment of the present invention. [Figure 2] 1 is an exploded perspective view of a lens device according to an embodiment of the present invention, as viewed from the subject image side. [Figure 3] 1 is an exploded perspective view of a lens device according to an embodiment of the present invention, as viewed from the user's side. [Figure 4] 1 is a front view of a lens device according to an embodiment of the present invention. [Figure 5] 3A and 3B are diagrams illustrating the relationship between each optical axis and an image circle on an image sensor according to an embodiment of the present invention. [Figure 6] 1 is a schematic diagram illustrating the configuration of an imaging device according to an embodiment of the present invention. [Figure 7] 1 is a schematic explanatory diagram showing a state in which the image sensor 111 is fixed with a slight tilt relative to the lens mount section 202. FIG. [Figure 8] 1 is a side view of a lens device (interchangeable lens) according to an embodiment of the present invention. [Figure 9] FIG. 2 is a block diagram of an electrical system of the imaging apparatus according to the embodiment of the present invention. [Figure 10] 10 is a flowchart illustrating a process for determining the movement of a focus lens according to an embodiment of the present invention. [Figure 11] FIG. 1 is an exploded perspective view of a lens device according to an embodiment of the present invention. [Figure 12] FIG. 2 is a schematic explanatory view of a focus ring according to an embodiment of the present invention. [Figure 13] FIG. 2 is an exploded perspective view of a position adjustment mechanism for a right-eye optical system according to an embodiment of the present invention. [Figure 14] FIG. 2 is a side view of a position adjustment mechanism for a right-eye optical system according to an embodiment of the present invention. [Figure 15] 3 is an enlarged view of a position adjustment unit and a guide unit for a right eye optical system according to an embodiment of the present invention. FIG. [Figure 16] FIG. 2 is a schematic explanatory diagram showing a load balance relationship in the embodiment of the present invention. [Figure 17] FIG. 2 is a front view showing the arrangement position of a position adjustment mechanism for a right-eye optical system according to an embodiment of the present invention. [Figure 18] FIG. 10 is a rear view showing the arrangement position of the position adjustment mechanism for the right eye optical system according to the embodiment of the present invention. [Figure 19] FIG. 2 is an exploded perspective view of a position adjustment mechanism for a right-eye optical system according to an embodiment of the present invention. [Figure 20] FIG. 3 is a cross-sectional view of a position adjustment mechanism for a right-eye optical system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the configurations described in the following embodiments are merely examples, and the scope of the present invention is not limited to the configurations described in the embodiments. The present invention provides a focusing operation mode (first mode) in which the focus of the left and right optical systems is adjusted integrally by the lens driver 400, and a focus adjustment mode (second mode) in which the relative focus of the left and right optical systems is electrically adjusted by the right eye driver 510. Furthermore, the present invention provides a lens device, an imaging device, etc., which can suppress deviation in the relative focus positions of the left and right optical systems even when power is turned off to the driver of one of the optical systems (the right eye driver 510). The lens device 200 (interchangeable lens) can be detachably attached to various imaging devices 100. Hereinafter, the lens device 200 may also be referred to as an interchangeable lens 200.

[0010] The lens device (interchangeable lens) 200 of each embodiment includes two optical systems (first optical system, second optical system) arranged symmetrically and parallel to each other, and is configured so that two image circles are formed parallel to one image sensor. The two optical systems are arranged horizontally, separated by a predetermined distance (baseline length). When viewed from the subject image side (in other words, when viewed from the image sensor side), the image formed by the right optical system (first optical system) is recorded as a moving image or still image for the right eye, and the image formed by the left optical system (second optical system) is recorded as a moving image or still image for the left eye.

[0011] When playing back videos or still images (video), the viewer can view the images using a known 3D display, VR goggles, or the like, with a right-eye image projected onto the viewer's right eye and a left-eye image projected onto the viewer's left eye. In this case, the viewer can experience a sense of three-dimensionality because images with parallax are projected onto the right and left eyes due to the baseline length of the lens device 200. In this way, the lens device of each 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.

[0012] (First embodiment: FIG. 1: Cross-sectional view of the lens device; FIG. 2: Exploded perspective view of the lens device; FIG. 3: Exploded perspective view of the lens device) First, a lens device (interchangeable lens) 200 according to a first embodiment will be described with reference to FIGS. 1, 2, and 3. FIG. 1 is a cross-sectional view of the lens device 200, showing a schematic cross-sectional 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. FIG. 2 is an exploded view seen from the subject side, and FIG. 3 is an exploded view seen from the user side. In the following description, the right-eye optical system will have "R" added to the end of its reference numeral, and the left-eye optical system will have "L" added to the end of its reference numeral. Elements common to both the right-eye optical system and the left-eye optical system will generally not have "R" or "L" added to the end of their reference numerals. However, "L" and "R" will generally be written in the drawings.

[0013] (Lens device 200: Right eye optical system 201R: Left eye optical system 201L) The lens device 200 has a right-eye optical system (first optical system) 201R and a left-eye optical system (second optical system) 201L. Each of the right-eye optical system 201R and the left-eye optical system 201L is capable of capturing an image with a field angle of 140 degrees or more. Each optical system is a bending optical system, and is set as follows in order from the subject side (object side) to the image side in each optical system:

[0014] (1st optical axis: OA1R, OA1L; 2nd optical axis: OA2R, OA2L; 3rd optical axis: OA3R, OA3L) That is, a first optical axis OA1 (OA1R, OA1L), a second optical axis OA2 (OA2R, OA2L) that is substantially perpendicular to the first optical axis OA1, and a third optical axis OA3 (OA3R, OA3L) that is parallel to the first optical axis OA1 are set. In each optical system, first lens groups 211R, 211L having convex surfaces 211A facing the subject are arranged on the first optical axis OA1. Similarly, second lens groups 221, 221-2 are arranged on the second optical axis OA2, and third lens groups 231, 231-2 are arranged on the third optical axis OA3. The convex surfaces of the first lens groups 211R, 211L are designated 211R(A) and 211L(A) in FIGS. 1, 2, and 4, and 211R(B) and 211L(B) are effective incident surfaces of the lenses, as will be described later. To indicate both, they are illustrated as "211R (A, B), 211L (A, B)."

[0015] Furthermore, the lens group is composed of one or more lenses. In each optical system, a first prism (first reflecting surface) 220, 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 (second reflecting surface) 230, 230 that bends the light beam of the second optical axis OA2 and guides it to the third optical axis OA3 are arranged. In the following description, the optical axis direction is the direction extending toward the subject side and the imaging plane side (image side). In other words, it is the direction of the first optical axis OA1 (OA1R, OA1L).

[0016] (Right eye optical system 201R: Left eye optical system 201L: Lens top base 300) The right-eye optical system 201R and the left-eye optical system 201L are fixed to a lens top base (holding member) 300 with screws or the like. The lens top base 300 is fixed to a lens bottom base 301 (see FIG. 2) with screws or the like. The lens bottom base 301 is held by a linear structure (not shown) so that it can move back and forth in the optical axis direction while its movement in the rotational direction is restricted. This allows the right-eye optical system 201R and the left-eye optical system 201L to move back and forth together in the optical axis direction, and the focus positions of the right-eye optical system 201R and the left-eye optical system 201L can be adjusted simultaneously. Also, L1 in the figure is the "base line length," which will be described later.

[0017] (Figure 4: Front view of the lens device) Next, the first lens group 211 (211C in FIG. 4, 211R and 211L in FIG. 2) and its surrounding structure will be described with reference to FIG. 4. FIG. 4 is a front view of the lens device 200. 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 is closed by a front exterior member 204 (204A to 204D). The front exterior member 204 is fixed to the exterior cover member 203 by screws or the like. The front exterior member 204 has openings 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.

[0018] (Front exterior member 204: Right eye optical system 201R: Left eye optical system 201L) The front exterior members 204A and 204B are shaped so as not to 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 140 degrees or more. The first lens groups 211R and 211L have lens surfaces 211R(A,B) and 211L(A,B) on the subject side, which also serve as the incident surfaces of the effective light beam. When the effective incident surface "211B" is defined as the lens surface of the first lens groups 211R and 211L, the 140-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, as described above. Note that, as described above, 211B refers to "211R(B) and 211L(B)," and "211R(A) and 211L(A)" refer to the convex surfaces of the first lens groups 211R and 211L.

[0019] Light beams with angles exceeding 140 degrees are located closer to the imaging surface than effective incident surface 211B of first lens group 211, and extend further toward the imaging surface as they become farther away from first lens group 211. Therefore, in order not to block light beams with angles exceeding 140 degrees, the surface shapes of front exterior members 204A to 204D are arranged closer to the imaging surface than effective incident surface 211B of first lens group 211. Cover member 213 is also arranged closer to the imaging surface than effective incident surface 211B.

[0020] (Figure 5: Relationship between each optical axis and the image circle on the image sensor 111) FIG. 5 is an explanatory 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. An "image circle" refers to the circular area where light passing through a lens forms an image. On the image sensor 111 located within the camera body 110, a right-eye image circle ICR with an effective angle of view formed by the right-eye optical system 201R and a left-eye image circle ICL with an effective angle of view formed by the left-eye optical system 201L form parallel images. It is preferable to appropriately 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. In FIG. 5, ΦD is the diameter of the lens mount 202, "L1" is the "baseline length," and "L2" is the distance between the third optical axes.

[0021] For example, consider a right region and a left region that are obtained by dividing the entire light receiving range of the image sensor 111 in half at the center. In this case, it is preferable to set the center of the right eye image circle ICR to be approximately in the center of the light receiving range corresponding to the right region, and to set the center of the left eye image circle ICL to be approximately in the center of the light receiving range corresponding to the left region.

[0022] (Distance between first optical axes OA1R and OA1L: Baseline length L1) Furthermore, the optical system of this embodiment is a "full-circle fisheye lens," and the image formed on the imaging surface is a circular image capturing a field of view range exceeding 140 degrees. As shown in FIG. 5, two circular images are formed on each side. 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 referred to as the "baseline length L1." The longer the base line length L1, the greater the stereoscopic effect during viewing. For example, when viewing VR, it is said that the field of view required to obtain a stereoscopic effect is approximately 120 degrees. However, a field of view of 120 degrees leaves a sense of discomfort, so the field of view is often widened. In this embodiment, imaging is possible with a field of view of approximately 140 degrees or more. The camera mount unit 122 and lens mount unit 202 will be described later. OA2R and OA2L, shown in the lower part of FIG. 5, are the second optical axis (OA2) shown in FIG. 1, and OA3R and OA3L are the third optical axis (OA3).

[0023] (FIG. 6: Schematic configuration diagram of an imaging device according to an embodiment of the present invention) 6 is a schematic diagram of an imaging device 100 according to this embodiment. The imaging device 100 has a camera body 110, which is the main body of the imaging device, and an interchangeable lens (lens device) 200 that is detachable from the camera body 110. The interchangeable lens (lens device) 200 is attached to the camera body 110 when in use. The imaging device 100 is an imaging device equipped with a so-called interchangeable lens mount, and has a single image sensor 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. In the lens device 200 according to this embodiment, the left and right eye optical systems (201R, 201L) are attached to a lens top base (holding member) 300.

[0024] The interchangeable lens 200 also includes a lens driver 400 that drives the right-eye optical system 201R and the left-eye optical system 20L. The lens driver 400 is a driver for moving the lens top base 300, and is, for example, a stepping motor, a DC motor, or the like. That is, the lens driver 400 can perform focus adjustment by integrally extending the left and right optical systems. As described above, a stepping motor, a DC motor, or the like is used as the drive source, but other electrical drive sources may also be used. The interchangeable lens 200 is attached to the camera body 110 via a lens mount 202 and a camera mount 122. In MF mode, focus adjustment of the left and right optical systems is performed based on user operation of the focus ring 600, as will be described later. The exterior surface of the interchangeable lens 200 is covered with an exterior cover member 203.

[0025] (Left eye optical system 201L: "1st optical system": Right eye optical system 201R: "2nd optical system") In this embodiment, 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 referred to as the "first optical system" and the right-eye optical system 201R is referred to as the "second optical system." However, this embodiment is not limited to this configuration, and for example, the first optical system and the second optical system may be optical systems with their left and right reversed, or they may be optical systems arranged above and below rather than arranged left and right. Furthermore, the first optical system and the second optical system are collectively referred to as the "left and right optical systems."

[0026] 6, the imaging device 100 includes a lens mount section 202, and a lens device 200 (interchangeable lens) is attached via the lens mount section 202. Therefore, the imaging element 111 in the imaging device 100 is arranged parallel to the lens mount section 202. However, it is difficult to perfectly maintain this parallel state due to manufacturing errors and the like, and the imaging element 111 is arranged and fixed with a slight tilt relative to the lens mount section 202.

[0027] (Figure 7: An explanatory diagram of the state in which the image sensor 111 is fixed with a slight tilt) 7 is a schematic diagram of the imaging device 100, illustrating a state in which the image sensor 111 is fixed with a slight tilt relative to the lens mount unit 202. The lens device 200 can adjust the distances between the imaging positions of the right-eye optical system 201R and the left-eye optical system 201L and the lens mount unit 202, so-called "flange back distances," during a manufacturing process or the like. However, even if these differences are brought close to "0," the left and right optical systems do not necessarily achieve the best focus positions due to factors such as tilting of the image sensor 111 within the imaging device 100. Therefore, in this embodiment, the relative focus positions of the left and right optical systems can be adjusted by moving the right-eye optical system 201R in a direction perpendicular to the imaging plane.

[0028] (FIG. 8: Side view of interchangeable lens 200: focus ring 600: mode selector switch 800) FIG. 8 is a side view of the interchangeable lens 200. The left and right eye optical systems are arranged to protrude relative to the interchangeable lens 200. The interchangeable lens 200 has an annular focus ring 600 on its rear end. A mode selector switch 800 is arranged on the left side when viewed from the lens mount unit 202 side. Depending on the setting of the mode selector switch 800, it is possible to select whether to move the lens top base 300 that holds the right eye optical system 201R and the left eye optical system 201L, or the right eye optical system 201R. Note that FIG. 8 shows a configuration in which the right eye optical system 201R and the left eye optical system 201L are arranged one above the other.

[0029] (AF / MF switch SW700) The interchangeable lens 200 can be switched between an autofocus mode ("AF mode") or a manual focus mode ("MF mode") using an AF / MF switch SW 700 (see FIG. 9) provided on the camera body 110. In "AF mode," automatic focus adjustment of the left and right optical systems is performed based on subject information. On the other hand, in "MF mode," focus adjustment of the left and right optical systems is performed manually based on user operation of the focus ring 600, which is an operating member. Specifically, when the AF / MF switch SW 700 is set to "MF mode," the left and right optical systems move in the optical axis direction when the user rotates the focus ring 600. In this embodiment, the AF mode and MF mode can be switched using the AF / MF switch SW 700, but switching between these modes may also be performed by selecting an appropriate item from a menu screen on the camera body 110.

[0030] (Operation of the focus ring 600 and mode selector switch 800) By operating the focus ring 600, the lens top base 300 that holds the right-eye optical system 201R and the left-eye optical system 201L, or the right-eye optical system 201R can be moved in the axial direction (optical axis direction) perpendicular to the image sensor 111. Then, when the mode selector switch 800 is set and the focus ring 600 is rotated, it is possible to select whether to move the lens top base 300 or the right-eye optical system 201R.

[0031] (First mode: Lens top base 300 moves) When the mode selector switch 800 is set in the direction opposite to the arrow (see symbol A) shown in FIG. 8, the lens top base 300 moves, thereby entering a mode (first mode) in which the left and right optical systems can be moved in the optical axis direction. In "first mode," the right and left optical systems 201R and 201L can be simultaneously moved in the axial direction (optical axis direction) perpendicular to the image sensor 111, allowing simultaneous focus adjustment while maintaining the left and right optical systems as a single unit. The first mode is a mode (focus adjustment state) in which relative focus adjustment of the left and right optical systems is possible. In this way, in the first mode, focus adjustment of both the left and right optical systems can be performed as a single unit.

[0032] (Second mode: the right eye optical system 201R is moved relative to the lens top base 300) When the mode changeover switch 800 is slid toward the lens mount unit 202 (arrow direction), the right eye optical system 201R moves relatively to the lens top base 300. Furthermore, the deviation in the relative focal positions of the right eye optical system 201R and the left eye optical system 201L is adjusted to enable focusing ("second mode"). In this way, in the second mode, the relative focus adjustment of both the left and right optical systems can be performed.

[0033] (The mode changeover switch 800 switches between "first mode" and "second mode") By switching between "first mode" and "second mode" using the mode selector switch 800, the user can make the following adjustments. That is, the user can adjust the flange focal distances of the left and right optical systems of the lens device 200 using the focus ring 600 in accordance with the tilt of the image sensor 111 of the image pickup device 100. By adjusting the relative offset between the flange focal distances of the left and right optical systems in advance during image pickup, quick focusing operations can be performed simultaneously on both optical systems by adjusting only the focus ring 600. The focus ring 600 is rotatably held by the exterior cover member 203 (see FIGS. 6 and 7, etc.) and fixed so as not to move in the focusing direction. In this embodiment, the focusing direction is the axial direction (optical axis direction) perpendicular to the image sensor 111.

[0034] (FIG. 9: Block diagram of the electrical system of the imaging device according to the embodiment of the present invention) Next, a configuration for realizing the above-mentioned focusing mechanism will be described with reference to Fig. 9. Fig. 9 is a block diagram of the electrical system of the imaging device 100 of this embodiment. The interchangeable lens 200 has a right eye drive unit 510 for moving the right eye optical system 201R, a lens mount unit 202, a focus ring 600, and an encoder 602. The interchangeable lens 200 also has an AF / MF switch 700, a lens system control unit 209, a mode selector switch 800, and a lens drive unit 400. The lens drive unit 400 moves a lens top base 300 that holds the right eye optical system 201R and the left eye optical system 201L.

[0035] The camera body 110 also 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 memory unit 116, an AF detection unit 117, a body system control unit 118, and a camera mount unit 122. When the interchangeable lens 200 is attached to the camera body 110 via the lens mount unit 202 and the camera mount unit 122, the body system control unit 118 and the lens system control unit 209 are electrically connected.

[0036] (imaging element 111: A / D conversion unit 112: image processing unit 113: display unit 114: operation unit 115) 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 as subject images on the image sensor 111. The image sensor 111 converts the formed subject image (optical signal) into an analog electrical signal and outputs it. The A / D conversion unit 112 converts the analog electrical signal output from the image sensor 111 into a digital electrical signal (image signal, digital signal of the subject image). The image processing unit 113 performs various image processing on the digital electrical signal output from the A / D conversion unit 112. The display unit 114 displays various information. The display unit 114 is realized by an electronic viewfinder, a liquid crystal panel, etc. The operation unit 115 functions as a user interface for the user to give instructions to the image capturing device 100. Furthermore, if the display unit 114 is configured to have a touch panel, the touch panel also constitutes one of the operation units 115.

[0037] (Memory unit 116: AF detection unit 117: Body system control unit 118: Lens system control unit 209) The memory unit 116 stores various data, such as image data processed by the image processing unit 113. The memory unit 116 also stores programs. The memory unit 116 is realized by a storage device such as a ROM or RAM. The AF detection unit 117 calculates the drive amounts of the lens drive unit 400 and the right eye drive unit 510 based on the digital electrical signal (image signal) output from the A / D conversion unit 112. The body system control unit 118 controls the entire imaging device 100. The body system control unit 118 is realized by, for example, a CPU, a ROM, etc. The body system control unit 118 loads the program stored in the memory unit 116 into RAM and executes it, thereby realizing various processes according to the present invention. The lens system control unit 209 determines the setting state of the mode selector switch 800, selects the right eye optical system 201R or the lens top base 300, and moves the selected member in accordance with the rotation of the focus ring 600.

[0038] (Figure 10: Flowchart showing the process for determining focus lens movement) 10 is a flowchart showing the processing performed by the body system control unit 118 and the lens system control unit 209 in this embodiment when determining the movement of the focus lens. The processing shown in FIG. 10 starts when the power of the imaging device 100 is turned on.

[0039] (Step S201: Step S202: Step S203) In step S201, the body system control unit 118 determines whether the AF / MF switch SW 700 is set to "AF." If it is determined that it is set to "AF" (YES), the process proceeds to step S202. On the other hand, if it is determined that it is not set to "AF," i.e., that it is set to "MF" (No), the process proceeds to step S208. In step S202, the lens system control unit 209 acquires the drive amount of the right eye drive unit 510 calculated by the AF detection unit 117 using the focus difference between the left and right images. In step S203, the lens system control unit 209 drives the right eye drive unit 510 by the drive amount acquired in step S202, and moves the right eye optical system 201R to a predetermined position. This eliminates the focus difference between the left and right images.

[0040] (Step S204: Step S205) In step S204, the lens system control unit 209 acquires the drive amount of the lens drive unit 400 calculated by the AF detection unit 117 using the AF detection result of the left eye image. In step S205, the lens system control unit 209 determines whether or not a half-press of the shutter button by the user has been detected. If it is determined that a half-press of the shutter button has been detected (YES), the process proceeds to step S206, and if it is determined that any other half-press of the shutter button has been detected (NO), the process enters a wait state in step S205.

[0041] (Step S206: Step S207: Step S208) In step S206, the lens system control unit 209 drives the lens driving unit 400 by the drive amount acquired in step S204 or the drive amount determined in step S211 (described later) to move the lens top base 300. This moves the left and right eye optical systems to predetermined positions. In step S207, the lens system control unit 209 executes a still image capturing operation in response to the user fully pressing the shutter button. Next, in step S208, the lens system control unit 209 determines whether the focus difference between the left and right images is greater than a predetermined value. If it is determined that the focus difference between the left and right images is greater than the predetermined value (YES), the process proceeds to step S209. On the other hand, if it is determined that the focus difference between the left and right images is smaller than the predetermined value (NO), the process proceeds to step S217. Note that if the focus difference between the left and right images is equal to the predetermined value, it is possible to arbitrarily set which step to execute.

[0042] (Step S209) In step S209, the lens system control unit 209 determines whether the member selected by the user using the AF / MF switching SW 700 to be moved in response to rotation of the focus ring 600 is the right eye optical system 201R. If it is determined to be the right eye optical system 201R (YES), the process proceeds to step S210. On the other hand, if it is determined not to be the right eye optical system 201R, i.e., if it is determined to be the lens top base 300 (NO), the process enters a wait state in step S209.

[0043] (Step S210: Step S211: Step S212) In step S210, the lens system control unit 209 acquires the amount of rotation (amount of operation) of the focus ring 600 by the user, detected by the encoder 602. In step S211, the lens system control unit 209 determines the drive amount of the right eye drive unit 510 using the rotation amount of the focus ring 600. In step S212, the lens system control unit 209 drives the right eye drive unit 510 using the drive amount determined in step S211 to move the right eye optical system 201R to a predetermined position.

[0044] (Step S213: Step S214) In step S213, the lens system control unit 209 determines whether the member selected by the user using the mode switch 800 to be moved in response to rotation of the focus ring 600 is the lens top base 300. If it is determined to be the lens top base 300 (YES), the process proceeds to step S214. On the other hand, if it is determined not to be the lens top base 300, i.e., if it is determined to be the right-eye optical system 201R (NO), the process enters a wait state in step S213. The process in step S214 is the same as the process in step S210, and therefore a repeated explanation will be omitted.

[0045] (Step S215; Step S216) In step S215, the lens system control unit 209 determines the drive amount of the lens top base 300 using the rotation amount of the focus ring 600. In step S216, the lens system control unit 209 drives the lens top base 300 using the drive amount determined in step S215 to move the left and right eye optical systems to predetermined positions.

[0046] (Step S217: Step S218 to Step S220) In step S217, the lens system control unit 209 determines whether the member selected by the user using the AF / MF switching SW 700 to be moved in response to rotation of the focus ring 600 is the lens top base 300. If it is determined to be the lens top base 300 (YES), the process proceeds to step S218. On the other hand, if it is determined not to be the lens top base 300, i.e., if it is determined to be the right-eye optical system 201R (NO), the process enters a wait state in step S217. The processes of steps S218, S219, and S220 are similar to the processes of steps S214, S215, and S216, respectively, and therefore will not be described again.

[0047] Although the present embodiment has been described using still image capture as an example, similar processing is possible for video capture. Furthermore, in the present embodiment, the right-eye optical system 201R is moved to align with the position of the left-eye optical system 201L using the detection results from the AF detection unit 117 in "MF mode," but the present invention is not limited to this. That is, it is sufficient to move one of the left and right optical systems so that the focus difference is eliminated. If there is ample depth of field, a slight focus difference between the left and right images is not a problem, so this positioning operation may be omitted. Furthermore, in the present embodiment, the left and right optical systems are equipped with an overall focus mechanism that can adjust the focus by moving all lenses, but may also be configured with an inner focus mechanism that can adjust the focus by moving some lenses.

[0048] (Figure 11: Exploded perspective view of the lens device) Next, a configuration for realizing the focusing mechanism described above will be described with reference to Fig. 11. Fig. 11 is an exploded perspective view of the lens device 200. The front exterior member 204 (see Fig. 4, etc.) forms the appearance of the front side of the lens device 200, and the mounting surfaces 311R and 311L are mounting surfaces for the lens top bases 300 of the right-eye optical system 201R and the left-eye optical system 201L, respectively. The right-eye optical system 201R is held movably relative to the lens top base 300 in a direction perpendicular to the image sensor 111 (optical axis direction). 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. Cam follower portions 301a are provided in three locations on the lens bottom base 301 (one location is shown in Fig. 11). The cam follower portion 301a comes into contact with a cam member 302 (described later), thereby enabling the cam member 301a to be driven in a direction (optical axis direction) perpendicular to the imaging element 111. The cam member 302 is engaged with and held by an exterior base member 303.

[0049] Furthermore, the cam member 302 engages with the focus ring 600 via a key portion (not shown), so that when the user rotates the focus ring 600, the cam member 302, which is connected to the interior of the lens device 200, can be rotated. The focus ring 600 is sandwiched between the exterior cover member 203 and the exterior base member 303, so that it is held radially by the exterior members and axially between the two members, allowing it to rotate. As the cam member 302 rotates, the lens top base 300 moves along an inclined surface 302b (described later in FIG. 12 ) provided on the cam member 302. This allows the left and right optical systems to move in the axial direction (optical axis direction) perpendicular to the image sensor 111, enabling focus adjustment of the left and right optical systems.

[0050] (Fig. 12: Schematic diagram of the focus ring) 12 is a schematic explanatory diagram of the focus ring 600 of the imaging device 100. The lens top base 300 is integrally formed with the lens bottom base 301 by fastening them with screws or the like. The cam follower portion 301a formed on the underside of the lens bottom base 301 is supported by a spring or the like so as to contact and be guided by the sloped 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 base member 303 and is rotatably held by having its outer diameter portion held in the exterior base member 303 in a so-called radially fitted state. This makes it possible to rotate the focus ring 600 to drive the lens top base 300 to which the left and right eye optical systems are fixed.

[0051] (Figure 13: Exploded perspective view of the position adjustment mechanism for the right-eye optical system; Figure 14: Side view of the position adjustment mechanism for the right-eye optical system; Figure 15: Enlarged view of the position adjustment unit and guide unit for the right-eye optical system) Next, a focus position adjustment mechanism that moves the right-eye optical system 201R relative to the lens top base 300 will be described with reference to Figs. 13, 14, and 15. Fig. 13 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 top base 300. Fig. 14 is a side view of the position adjustment mechanism. Fig. 15 is an enlarged view of the adjustment unit and guide unit of the right-eye optical system 201R.

[0052] (Figure 13:Figure 14) 13 and 14, the right-eye optical system 201R is biased by three screws 501a, 501b, and 501c and three compression springs (first biasing members) 502a, 502b, and 502c. That is, these constantly bias the right-eye optical system 201R in a predetermined direction (mounting direction) relative to the lens top base 300. In this state, the right-eye optical system 201R is attached in contact with the coupling surface, which is the mounting portion of the lens top base 300. An eccentric rotation member (fifth gear) 503 is rotatably attached to the lens top base 300, and the outer periphery of the eccentric rotation member 503 is fitted into D-cut portions 251a and 251b (see FIG. 15) of the hole portion 251 of the right-eye optical system 201R.

[0053] (Figure 15) As shown in Fig. 15, the eccentric rotation member 503 has an outer center OZ2 (see the lower side of Fig. 15) eccentric with respect to a rotation center OZ1 (see the lower side of Fig. 15). When the eccentric rotation member 503 rotates, the right-eye optical system 201R can be adjusted in the optical axis direction while sliding relative to the lens top base 300 by an amount corresponding to the amount of eccentricity of the outer center OZ2 with respect to the rotation center OZ1. The arrow "OA1" at the bottom of Fig. 15 indicates the first optical axis. As shown in Fig. 14, a tension spring (biasing member) 507 (see also Fig. 13, etc.) is hooked between the right-eye optical system 201R and the lens top base 300.

[0054] The tension spring 507 is disposed with respect to the eccentric rotation member 503 across the optical axis of the right-eye optical system 201R, and simultaneously 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, when the eccentric rotation member 503 rotates, the right-eye optical system 201R comes into contact with the D-cut portion 251a (see FIG. 15) of the hole portion 251, thereby moving the right-eye optical system 201R in the optical axis direction relative to the lens top base 300. Furthermore, the right-eye optical system 201R is configured to be able to move parallel to the optical axis direction by rotation of the eccentric rotation member 503.

[0055] (Figure 13: Figure 14: Figure 15: Rolling bearing (guide part)) For example, as specifically shown in Figure 13 and other figures, two rolling bearings (guide portions) 505a and 505b are arranged parallel to the optical axis direction and are rotatably attached to the lens top base 300 by shoulder screws 506a and 506b. The two rolling bearings 505a and 505b fit into rectilinear guide portions 252a, 252b, 253a, and 253b of guide holes 252 and 253 (see Figure 15 and other figures) of the right-eye optical system 201R. These function as rectilinear guide portions for moving the right-eye optical system 201R in a direction parallel to the optical axis (adjustment direction).

[0056] Then, while biasing the right-eye optical system 201R in the optical axis direction, a rotational moment is generated starting from the contact point between the eccentric rotation member 503 and the hole 251 of the right-eye optical system 201R. The force of the tension spring 507 (see FIG. 13, etc.) allows the right-eye optical system 201R to move without rattle while being guided by the two rolling bearings 505a and 505b.

[0057] (Figure 16: Explanatory diagram showing the load balance relationship) Next, the relationship (load balance relationship) between the weight, frictional force, and spring generated between the lens top base 300 and the right-eye optical system 201R will be described with reference to FIGS. 16(a) and 16(b). FIGS. 16(a) and 16(b) are schematic explanatory 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 top base 300 and the right-eye optical system 201R is "μ." Furthermore, the normal force generated between the right-eye optical system 201R or the left-eye optical system 201L and the lens top base 300 is "N." Furthermore, the spring constant of the three compression springs 502a, 502b, and 502c (see FIG. 13, etc.) is "k1," the displacement amount (extension amount) is "x1," and the spring constant of the tension spring 507 is "k2," and the displacement amount is "x2."

[0058] In this case, it is preferable that the following conditional expressions (1) and (2) be satisfied when the right-eye optical system 201R faces the direction of gravity. [Formula 1] μN+mg <k2·x2 (1) [Formula 2] N=3×(k1·x1) (2)

[0059] By achieving such a load balance, the eccentric rotation member 503 and the right-eye optical system 201R always abut against each other without rattle, regardless of the orientation of the lens device 200. This eliminates problems such as the lens unit of the right-eye optical system 201R not following the adjustment of the eccentric rotation member 503. The configuration described above makes it possible to move the right-eye optical system 201R to a desired position without rattle, even if the adjustment unit is located away from the optical axis. Similarly, the left-eye optical system 201L is attached in abutment against the attachment surface 311L (see FIG. 11, etc.) of the lens top base 300, and is equipped with an adjustment mechanism similar to that of the right-eye optical system 201R. The adjustment operation described above enables the left-eye optical system 201L to slide relative to the lens top base 300 in a direction parallel to the optical axis.

[0060] A right-eye adjustment mechanism (not shown), which will be described later, is connected to the right-eye optical system 201R and is configured to allow adjustment of the left-eye optical system 201L during the assembly process of the lens device 200, thereby increasing 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 top base 300, and since no other components are used, relative left-right tilt and decentering are suppressed during focus adjustment. In this embodiment, the eccentric rotation member 503 has been described as an example of an adjustment member that adjusts the focus position of the optical system, but the eccentric rotation member 503 may not be used. Furthermore, although the "rolling bearings (505a, 505b)" have been described as an example of a linear guide unit, the present invention is not limited to this configuration and may instead be a cover member that guides linear movement, etc.

[0061] (FIG. 17: Front view showing the arrangement of the position adjustment mechanism for the right-eye optical system 201R; FIG. 18: Rear view of the same) Next, the connection between the right eye adjustment mechanism and the right eye optical system 201R will be described with reference to FIGS. 17 and 18. FIG. 17 is a front view showing the location of the right eye adjustment mechanism, which is a drive mechanism for the right eye optical system 201R, and FIG. 18 is a rear view showing the location of the right eye adjustment mechanism. As shown in FIGS. 17 and 18, the right eye adjustment mechanism is a reduction mechanism composed of a right eye drive unit 510 and a gear mechanism consisting of multiple gears. Specifically, the reduction mechanism is configured by a gear (not shown) provided in the right eye drive unit 510 meshing with and connecting a first gear 511, a second gear 512, a third gear 513, a fourth gear 514, and a fifth gear (final stage gear) 520. The output torque generated by the right eye drive unit 510 is increased to a desired torque force. As shown in FIG. 17, the rotation of the fifth gear 520 rotates the eccentric rotation member 503. The relationship between the fifth gear 520, the biasing spring 524 (elastic member), the connecting member 521, and the like in FIG. 18 will be described later with reference to FIG. 19 and the like.

[0062] (FIG. 19: Exploded perspective view of the position adjustment mechanism for the right-eye optical system 201R; FIG. 20: Cross-sectional view of the position adjustment mechanism for the right-eye optical system 201R) Next, the configuration of a unit including a fifth gear 520 will be described with reference to FIGS. 19 and 20. FIG. 19 is an exploded perspective view of the fifth gear 520 (unit). FIG. 20 is a cross-sectional view of the connection portion between the fifth gear 520 (unit) and the aforementioned reduction mechanism. The fifth gear 520 includes an eccentric rotation member (fifth gear) 503, a connection member 521, a collar member 522, a screw 523, a biasing spring (elastic member) 524, and an O-ring 525. For convenience, the eccentric rotation member 503 will be described with the bottom side of the drawing as the rear side. The eccentric rotation member 503 has second guide portions 503b formed at its rear portion, which are inserted into and engaged with the collar member 522 and the connection member 521, respectively. The rear end of the eccentric rotation member 503 is attached to the lens top base 300 via the connection member 521 by tightening with a screw 523.

[0063] The biasing spring 524 is sandwiched between the lens top base 300 and the collar member 522 via O-rings 525 at the front and rear. Therefore, the biasing spring 524 presses the eccentric rotation member 503 via the collar member 522 (the arrow in FIG. 20 indicates the pressing direction), and a connecting member 521 engaged with the eccentric rotation member 503 presses and holds the lens top base 300. The connection state when the focus ring 600 and the right-eye adjustment mechanism are operated will be described later, but with the above-mentioned configuration, the right-eye adjustment mechanism is rotated by the speed reduction mechanism via the right-eye drive unit 510, and the rotational force (rotational drive force) is transmitted to the eccentric rotation member 503. When the eccentric rotation member 503 rotates as described above, the contact portion with the eccentric right-eye optical system 201R moves in the axial direction (optical axis direction) perpendicular to the image sensor 111, so that the right-eye optical system 201R can be moved.

[0064] (Friction retention force) 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 rotation member 503 is given a frictional holding force by a connecting member 521 that engages with the eccentric rotation member 503 being biased against the lens top base 300 by a biasing spring 524.

[0065] For this reason, when adjusting the position of the right eye optical system 201R, it is necessary to rotate the eccentric rotation member 503 by using the right eye adjustment mechanism to generate a rotational force that exceeds the frictional holding force generated between the connecting member 521 and the lens top base 300. This makes it possible to prevent the right eye optical system 201R from easily moving due to an unintended impact or the like when the right eye drive unit 510 that drives the right eye optical system 201R is not energized.

[0066] As described above, in this embodiment, the right-eye adjustment mechanism coupled to the right-eye optical system 201R has been described as an example, but the left-eye optical system 201L is also provided with a focus adjustment mechanism. Therefore, the left-eye optical system 201L and the right-eye adjustment mechanism may be configured to be coupled. Furthermore, while the lens device of this embodiment has been described as an interchangeable lens as an example, the present invention is not limited to this and can also be applied to an imaging device in which the camera body 110 and the lens device 200 are integrally configured.

[0067] (Summary of the main invention) The lens device 200 is detachable from the imaging device 100 and includes a right-eye optical system 201R (first optical system), a left-eye optical system 201L (second optical system), and a drive unit (510) that electrically drives the right-eye optical system 201R to adjust the relative focus of the two optical systems. The lens device 200 also includes a holding mechanism (such as a lens top base 300) that holds the right-eye optical system 201R so as not to move even when the drive unit (510) is turned off. The holding mechanism holds the right-eye optical system 201R so as not to move by a frictional holding force generated within the mechanism. Specifically, the frictional holding force is generated by being biased against the lens top base 300 by a biasing spring 524.

[0068] Furthermore, according to each embodiment, it is possible to provide a lens apparatus 200 and an imaging apparatus 100 that are capable of appropriately adjusting the focus of multiple optical systems with a simple operation. Although the 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 without departing from the spirit and scope of the present invention.

[0069] <Additional Note> The disclosure of this embodiment includes the following configuration. (Configuration 1) A lens device that is detachable from an imaging device and has a plurality of lenses, a first optical system; A second optical system; a driving unit for electrically driving the first optical system to adjust the relative focus of both optical systems; The optical system further includes a holding mechanism that holds the first optical system so that it does not move even when the power supply to the driving unit is turned off. (Configuration 2) The holding mechanism includes: The lens device according to configuration 1, wherein the first optical system is held so as not to move by a frictional holding force generated in the mechanism. (Configuration 3) The lens device according to configuration 2, wherein the frictional holding force is generated by the biasing force of a biasing spring. (Configuration 4) The drive unit is The lens device according to configuration 1, wherein the lens device is connected to a speed reduction mechanism composed of a plurality of gear trains. (Configuration 5) a first mode in which the focus adjustment of the first optical system and the second optical system is performed integrally, and a second mode in which the focus adjustment of both optical systems is performed relative to each other; 4. The lens device according to any one of configurations 1 to 3, wherein the first mode and the second mode are switchable. (Configuration 6) In the first mode, The lens device according to configuration 5, wherein a second driving section moves the first optical system and the second optical system together in the optical axis direction. (Configuration 7) In the second mode, The drive unit is The lens device according to configuration 5, wherein the first optical system is moved relative to the holding mechanism to adjust the deviation of the relative focal positions of the first optical system and the second optical system. (Configuration 8) The drive unit is The lens device according to configuration 2, wherein the first optical system is driven against a frictional holding force generated in the holding mechanism. (Configuration 9) An imaging device to which the lens device according to any one of configurations 1 to 3 can be detachably attached. (Configuration 10) A lens device that is integrally configured with an imaging device and has a plurality of lenses, a first optical system; A second optical system; a driving unit for electrically driving the first optical system to adjust the relative focus of both optical systems; a holding mechanism that holds the first optical system so that it does not move even when power to the drive unit is turned off. (Configuration 11) The holding mechanism includes: 11. The lens device according to configuration 10, wherein the first optical system is held so as not to move by a frictional holding force generated in the mechanism. (Configuration 12) 12. The lens device according to claim 11, wherein the frictional holding force is generated by the biasing force of a biasing spring. (Configuration 13) The drive unit is 11. The lens device according to configuration 10, which is connected to a speed reduction mechanism composed of a plurality of gear trains. (Configuration 14) a first mode in which the focus adjustment of the first optical system and the second optical system is performed integrally, and a second mode in which the focus adjustment of both optical systems is performed relative to each other; 13. The lens device according to any one of configurations 10 to 12, wherein the first mode and the second mode are switchable. (Configuration 15) In the first mode, 15. The lens device according to configuration 14, wherein a second drive unit moves the first optical system and the second optical system together in the optical axis direction. (Configuration 16) In the second mode, The drive unit is The lens device described in configuration 14, characterized in that the first optical system is moved relative to the holding mechanism to adjust the deviation of the relative focal positions of the first optical system and the second optical system. (Configuration 17) The drive unit is 12. The lens device according to configuration 11, wherein the first optical system is driven against a frictional holding force generated in the holding mechanism. (Configuration 18) 13. An imaging device to which the lens device according to claim 10 can be detachably attached. [Explanation of symbols]

[0070] 100 Imaging device 110 Camera body 111 Image sensor 112 A / D conversion section 113 Image processing section 114 Display section 115 Operation section 116 Storage section 117 AF detection unit 118 Main system control unit 122 Camera mount 200 Lens Device 201R Right eye optical system (1st optical system) 201L Left eye optical system (second optical system) 202 Lens mount 203 Exterior cover member 204 Front exterior member 211 First lens group 220 First Prism 230 Second Prism 300 Lens Top Base 400 Lens drive unit 503 Eccentric Rotating Member 505a, 505b Roller bearings 506a, 506b shoulder screws 510 Right eye drive unit 511 First Gear 512 2nd Gear 513 3rd Gear 514 4th Gear 520 5th Gear 521 Connecting member 522 Colored parts 523 Screw 524 bias spring 525 O-ring 600 focus ring 602 Encoder 700 AF / MF switch 800 Mode Switch

Claims

1. A lens device that is detachable from an imaging device and has a plurality of lenses, a first optical system; and A second optical system; a driving unit for electrically driving the first optical system to adjust the relative focus of both optical systems; a holding mechanism that holds the first optical system so that it does not move even when power to the drive unit is turned off.

2. The holding mechanism includes:

2. The lens device according to claim 1, wherein the first optical system is held so as not to move by a frictional holding force generated in the mechanism.

3. 3. The lens device according to claim 2, wherein the frictional holding force is generated by the biasing force of a biasing spring.

4. The drive unit is 2. The lens device according to claim 1, wherein the lens device is connected to a speed reduction mechanism comprising a plurality of gear trains.

5. a first mode in which the focus adjustment of the first optical system and the second optical system is performed integrally, and a second mode in which the focus adjustment of both optical systems is performed relative to each other; 4. The lens device according to claim 1, wherein the first mode and the second mode are switchable.

6. In the first mode, 6. The lens device according to claim 5, wherein a second driving section moves the first optical system and the second optical system together in the optical axis direction.

7. In the second mode, The drive unit is 6. The lens device according to claim 5, wherein the first optical system is moved relative to the holding mechanism to adjust a deviation in relative focal positions between the first optical system and the second optical system.

8. The drive unit is 3. The lens device according to claim 2, wherein the first optical system is driven against a frictional holding force generated by the holding mechanism.

9. An imaging device to which the lens device according to any one of claims 1 to 3 can be detachably attached.

10. A lens device that is integrally configured with an imaging device and has a plurality of lenses, a first optical system; and A second optical system; a driving unit for electrically driving the first optical system to adjust the relative focus of both optical systems; a holding mechanism that holds the first optical system so that it does not move even when power to the drive unit is turned off.

11. The holding mechanism includes:

11. The lens device according to claim 10, wherein the first optical system is held so as not to move by a frictional holding force generated in the mechanism itself.

12. 12. The lens device according to claim 11, wherein the frictional holding force is generated by the biasing force of a biasing spring.

13. The drive unit is 11. The lens device according to claim 10, wherein the lens device is connected to a speed reduction mechanism that is composed of a plurality of gear trains.

14. a first mode in which the focus adjustment of the first optical system and the second optical system is performed integrally, and a second mode in which the focus adjustment of both optical systems is performed relative to each other; 13. The lens device according to claim 10, wherein the first mode and the second mode are switchable.

15. In the first mode, 15. The lens device according to claim 14, wherein a second driving unit moves the first optical system and the second optical system together in the optical axis direction.

16. In the second mode, The drive unit is 15. The lens device according to claim 14, wherein the first optical system is moved relative to the holding mechanism to adjust a deviation in relative focal positions between the first optical system and the second optical system.

17. The drive unit is 12. The lens device according to claim 11, wherein the first optical system is driven against a frictional holding force generated by the holding mechanism.

18. An imaging device to which the lens device according to any one of claims 10 to 12 can be detachably attached.

Images