Lens device and image capturing device

Abstract

To provide a lens device which enables easy attachment and detachment of a filter.SOLUTION: A lens device is provided, comprising a lens mount (202) to be attached to a camera body (110), a mount cover (301) provided on the lens mount (202), a filter (302), and a filter holding member (303) for holding the filter (302), the filter holding member (303) being configured to be attachable to the mount cover (301).SELECTED DRAWING: Figure 11

Description

[Technical field]

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

[0002] Patent Document 1 discloses a camera system for stereoscopic photography in which two optical systems are arranged in parallel, and two image circles are formed in parallel on one image sensor. Patent Documents 2 and 3 disclose a configuration in which a film-like filter made of thin sheet-like gelatin or triacetate is attached to the most image surface side of an interchangeable lens. More specifically, Patent Document 2 discloses a configuration in which a filter is held by a U-shaped or semicircular member around an opening on the attached side of the interchangeable lens. Patent Document 3 discloses a configuration in which a filter is directly held by a bayonet structure. Patent Document 4 discloses a configuration in which a transparent plate is arranged closer to the camera body than the rearmost lens group and fixed to a fixed cylinder, and a female screw for attaching accessories is provided at the rear end of the mount of the lens barrel, so that the transparent plate is attached to a filter frame having a male screw and screwed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-3022 A [Patent Document 2] Japanese Utility Model Application Publication No. 57-130808 [Patent Document 3] JP 2020-67575 A [Patent Document 4] JP 2005-70800 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configurations disclosed in Patent Document 2 and Patent Document 3, it takes time to remove the filter, and the filter is easily stained, fingerprinted, or scratched. In addition, it is necessary to consider how to handle the filter after removal. In the configuration disclosed in Patent Document 4, a general accessory filter can be screwed directly into the rear end of the lens barrel, so when a thick filter is screwed in, the amount of protrusion increases and the filter penetrates into the camera body. As a result, it may collide with a mechanism such as a shutter inside the camera body. In addition, in the configuration disclosed in Patent Document 4, the user may touch the electrical contacts of the interchangeable lens when attaching the filter. As a result, the electrical contacts may be soiled with fingerprints, etc., which may cause communication failure between the camera and the lens.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a lens device and an imaging device that allow easy attachment and detachment of a filter. [Means for solving the problem]

[0006] A lens device according to one aspect of the present invention comprises a lens mount for attaching a camera body, a mount cover provided on the lens mount, a filter, and a filter holding member that holds the filter, the filter holding member being configured to be attachable to the mount cover.

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

[0008] According to the present invention, it is possible to provide a lens device and an imaging device to which a filter can be easily attached and detached. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic configuration diagram of an imaging device according to each embodiment. [Diagram 2] 3 is a cross-sectional view of a lens device in each embodiment. FIG. [Diagram 3] FIG. 2 is an exploded perspective view of the lens device in each embodiment, as viewed from the subject side. [Figure 4] FIG. 2 is an exploded perspective view of the lens device according to each embodiment, as viewed from the imaging surface side. [Diagram 5] FIG. 2 is a front view of the lens device in each embodiment. [Figure 6] FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5 as a modified example. [Figure 8] FIG. 6 is a cross-sectional view taken along line BB in FIG. [Figure 9] 3A to 3C are diagrams illustrating the arrangement of optical axes and image circles on an image sensor in each embodiment. [Figure 10] 10A to 10C are diagrams illustrating reflections of a left-eye optical system when an image is captured by a right-eye optical system in each embodiment. [Figure 11] FIG. 2 is an exploded perspective view of a filter configuration in the first embodiment. [Figure 12] 3A and 3B are rear views of the lens device according to the first embodiment when a filter is retracted and when a filter is inserted. [Figure 13] FIG. 13 is an exploded perspective view of a filter configuration according to a second embodiment. [Figure 14] 13A and 13B are rear views of the lens device according to the second embodiment when the filter is retracted and when the filter is inserted. [Figure 15] FIG. 13 is an exploded perspective view of a filter configuration according to a third embodiment. [Figure 16] 13A to 13C are rear views of the lens device according to the third embodiment when the filter is retracted and when the filter is inserted. [Figure 17] FIG. 13 is a perspective view of a filter holder in a fourth embodiment. [Figure 18] 13 is an explanatory diagram of a mount cover in the fourth embodiment. FIG. [Figure 19] 13 is an explanatory diagram of a dust cap in the fourth embodiment. FIG. [Figure 20] FIG. 13 is an exploded perspective view of a filter holder unit according to a fifth embodiment. [Figure 21] FIG. 13 is a perspective view of a filter holder unit and a mount cover in a fifth embodiment. [Figure 22] FIG. 13 is a perspective view of a filter holder unit in a sixth embodiment. [Diagram 23] 13 is an explanatory diagram of a mount cover in the sixth embodiment. FIG. [Figure 24] FIG. 13 is a perspective view of a filter holder in a seventh embodiment. [Diagram 25] FIG. 23 is a perspective view of a mount cover and a filter holder in the seventh embodiment. [Figure 26] FIG. 23 is a perspective view of a filter holder unit and a mount cover in the eighth embodiment. [Figure 27] FIG. 13 is an exploded perspective view of a filter holder unit in an eighth embodiment. [Figure 28] FIG. 23 is a perspective view of a filter holder unit and a mount cover in the eighth embodiment. [Figure 29] FIG. 13 is an exploded perspective view of a filter holder unit in an eighth embodiment. [Diagram 30] FIG. 23 is a perspective view of a filter holder unit and a mount cover in the eighth embodiment. [Diagram 31] 13 is a cross-sectional view of the entire lens barrel including the filter holder unit in the eighth embodiment. FIG. [Diagram 32] FIG. 23 is a front view of a filter holder unit and a mount cover in the eighth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same reference numerals are used to refer to the same components, and duplicated explanations will be omitted. (First embodiment) First, an imaging device 100 according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a schematic configuration diagram of the imaging device 100. In Fig. 10, the imaging device 100 has a camera body 110 and a lens device (interchangeable lens) 200, and is capable of capturing a stereoscopic image. The lens device 200 is detachable from the camera body 110. In this embodiment, the imaging device 100 is an imaging system having the camera body 110 and the lens device 200 detachable from the camera body 110. However, this embodiment is not limited to this, and can also be applied to an imaging device in which the camera body and the lens device are integrally configured.

[0011] 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 storage unit 116 , a camera control unit 117 , and a camera mount 122 .

[0012] The lens device 200 has a right-eye optical system (first optical system) 201R, a left-eye optical system (second optical system) 201L, a lens mount (mount unit) 202, and a lens control unit 209, and is detachably attached to the camera body 110. The two optical systems are arranged in parallel (symmetrically) and configured to form two image circles in parallel on the image sensor 111. The two optical systems are arranged in the horizontal direction with a predetermined distance (baseline length) between them. When viewed from the image plane side (image side), an image formed by the right-eye optical system 201R located on the right side is recorded as a video or still image for the right eye, and an image formed by the left-eye optical system 201L located on the left side is recorded as a video or still image for the left eye. When playing back the video or still image, a 3D display, VR goggles, or the like is used to view the video or still image, so that a right-eye image is projected on the viewer's right eye and a left-eye image is projected on the viewer's left eye. At this time, images with parallax are projected onto the right and left eyes depending on the baseline length, allowing the viewer to experience a sense of three-dimensionality. In this way, lens device 200 is a lens device for stereoscopic photography capable of forming two images with parallax using two optical systems.

[0013] When the lens device 200 is attached to the camera body 110 via the lens mount 202 and the camera mount 122, the camera control unit 117 and the lens control unit 209 are electrically connected.

[0014] The image of the subject is formed on the imaging element 111 in the form of a right eye image formed via the right eye optical system 201R and a left eye image formed via the left eye optical system 201L, arranged side by side. The imaging element 111 converts the formed image of the subject (optical signal) into an analog electrical signal. The A / D conversion unit 112 converts the analog electrical signal output from the imaging element 111 into a digital electrical signal (image signal). Here, the A / D conversion unit 112 may be built into the imaging element 111. The image processing unit 113 performs various image processing on the digital electrical signal output from the A / D conversion unit 112.

[0015] The display unit 114 displays various information. The display unit 114 is realized by using, for example, an electronic viewfinder or a liquid crystal panel. The operation unit 115 has a function as a user interface for the user to give instructions to the imaging device 100. If the display unit 114 has a touch panel, the touch panel also becomes one of the operation unit 115. The storage unit 116 is realized by using, for example, a ROM, a RAM, or a HDD, and stores various data and programs such as image data that has been image-processed by the image processing unit 113. The camera control unit 117 is realized by using, for example, a CPU, and controls the entire imaging device 100.

[0016] Next, the lens device 200 will be described with reference to Fig. 2 to Fig. 4. Fig. 2 is a cross-sectional view of the lens device 200. Fig. 3 is an exploded perspective view of the lens device 200 as viewed from the subject side (object side). Fig. 4 is an exploded perspective view of the lens device 200 as viewed from the imaging surface side.

[0017] In the following description, the right-eye optical system 201R is described with an R at the end of its reference numeral, and the left-eye optical system 201L is described with an L at the end of its reference numeral. The right-eye optical system 201R and the left-eye optical system 201L are described with neither an R nor an L at the end of their reference numerals. Each of the right-eye optical system 201R and the left-eye optical system 201L can capture images at an angle of view exceeding 180 degrees. Each optical system is a bending optical system having two reflecting surfaces. In each optical system, a first optical axis OA1, a second optical axis OA2 substantially perpendicular to the first optical axis OA1, and a third optical axis OA3 parallel to the first optical axis OA1 are set in order from the subject side. Each optical system has a first lens 211 having a convex lens surface 211A on the subject side arranged on the first optical axis OA1, a second lens 221 arranged on the second optical axis OA2, and third lenses 231a and 231b arranged on the third optical axis OA3. Each optical system has a first prism 220 that bends the light flux of the first optical axis OA1 to the second optical axis OA2, and a second prism 230 that bends the light flux of the second optical axis OA2 to the third optical axis OA3. In the following description, the optical axis direction refers to a direction extending toward the subject side and the imaging surface side, which is parallel to the first optical axis OA1.

[0018] Each optical system is fixed to a lens top base 300 by screwing or the like. The lens top base 300 is fixed to a lens bottom base 310 by screwing or the like. The lens bottom base 310 is held movable in the optical axis direction while movement in the rotational direction is restricted by a linear structure (not shown). This allows each optical system to move integrally in the optical axis direction, so that the focus positions of the right eye optical system 201R and the left eye optical system 201L can be adjusted simultaneously.

[0019] Next, the first lens 211 and its surrounding structure will be described with reference to Fig. 5 to Fig. 8. Fig. 5 is a front view of the lens device 200. Figs. 6 and 7 are cross-sectional views taken along line AA in Fig. 5, and show the first lens 211 of the lens device 200 and its surrounding structure. Fig. 8 is a cross-sectional view taken along line BB in Fig. 5, and shows the first lens 211 of the lens device 200 and its surrounding structure.

[0020] The lens device 200 has an exterior cover member 203 and a front exterior member (exterior member) 204. The exterior cover member 203 houses the right eye optical system 201R and the left eye optical system 201L. The front exterior member 204 is fixed to the exterior cover member 203 with screws, and together with the exterior cover member 203, the front side of the lens device 200 can be stored in a manner that covers it.

[0021] The front exterior member 204 has an opening (second opening) 204F into which the first lens (first lens) 211R of the right-eye optical system 201R and the first lens (second lens) 211L of the left-eye optical system 201L are inserted. The front exterior member 204 has a shape that does not block the effective light beam of the effective angle of view FOV of the right-eye optical system 201R and the left-eye optical system 201L exceeding 180 degrees. The lens surfaces 211A on the subject side of the first lens group 211R and 211L are the incident surfaces of the effective light beam on the subject side. When the effective incident surface 211B is the part of the lens surface 211A inside the effective incident surface outer diameter 211C, the light beam with the angle of view of 180 degrees extends horizontally in a direction approximately perpendicular to the effective incident surface 211B and the optical axis. A light beam with an angle of view exceeding 180 degrees is located closer to the imaging surface than the effective incidence surface 211B, and extends further toward the imaging surface as it moves away from the first lens group 211. Therefore, in order not to block a light beam with an angle of view exceeding 180 degrees, the front exterior member 204 and the cover member 213 are disposed closer to the imaging surface than the effective incidence surface 211B.

[0022] 5, the right-eye optical system 201R side of the center point O between the right-eye optical system 201R and the left-eye optical system 201L is defined as a right-eye region 20R, and the left-eye optical system 201L side is defined as a left-eye region 20L. In the right-eye region 20R, the front exterior member 204 has an object-side surface 204A that approaches the imaging surface side as it moves away from the first lens 211L of the left-eye optical system 201L so as not to block the outermost effective light flux of the left-eye optical system 201L (thick dotted line portion in FIG. 8). In addition, in the left-eye region 20L, the front exterior member 204 has an object-side surface 204B that approaches the imaging surface side as it moves away from the first lens 211R of the right-eye optical system 201R so as not to block the outermost effective light flux of the right-eye optical system 201R. However, the first lens 211L and its periphery as viewed from the right eye optical system 201R, and the first lens 211R and its periphery as viewed from the left eye optical system 201L, have regions that block part of each other's effective light flux.

[0023] The front exterior member 204 has walls 204C and 204D that protrude toward the subject side beyond the subject side surfaces 204A and 204B to form an opening 204F. The wall 204C has an arc shape that is approximately coaxial with the first lens 211R of the right eye optical system 201R, and does not block the effective light beam of the right eye optical system 201R, but blocks a part of the effective light beam of the left eye optical system 201L. The wall 204D has an arc shape that is approximately coaxial with the first lens 211L of the left eye optical system 201L, and does not block the effective light beam of the left eye optical system 201L, but blocks a part of the effective light beam of the right eye optical system 201R.

[0024] 6, the lens device 200 has a first lens holding member 212 and a cover member 213. The first lens holding member 212 holds the first lenses 211R, 211L. The cover member 213 covers the outer periphery of the lens surfaces 211A of the first lenses 211R, 211L on the subject side, and has an opening (first opening) 213A into which the first lenses 211R, 211L fit. The opening 213A is formed so as to expose the first lenses 211R, 211L when viewed from the optical axis direction.

[0025] A boundary 211D with the lens surface 211A exists on the outer periphery side of the effective incidence surface outer diameter 211C of the first group lens 211. The boundary 211D is a boundary between the lens surface 211A and another surface or member. For example, the boundary 211D may be a boundary between the lens surface 211A and a side surface 211E of the first group lens 211, or as shown in Fig. 7, it may be a boundary between the lens surface 211A and an inner diameter tip portion of a crimp claw shape that crimps and fixes the first group lenses 211R and 211L.

[0026] Cover member 213 covers boundary 211D. That is, the inner diameter of opening 213A of cover member 213 is smaller than the diameter of boundary 211D. When the inner diameter of opening 213A is ΦA and the diameter of boundary 211D is ΦB, the overlap amount X on one side is expressed by the following formula (1).

[0027] X = (ΦB - ΦA) / 2 … (1) By covering and concealing the boundary 211D, the appearance quality can be improved.

[0028] A groove 213B is formed in a part of the inner circumference of the cover member 213. A convex portion 212A extending toward the outer circumference is formed in a part of the outer circumference of the first group lens holding member 212. The groove 213B and the convex portion 212A are assembled when they are in a position where they do not overlap when viewed from the optical axis direction, and the convex portion 212A fits into the groove 213B by rotating the cover member 213. In this way, the cover member 213 is positioned relative to the first group lens holding member 212 in the optical axis direction. Note that a groove may be provided in the first group lens holding member 212, and a convex portion may be provided in the cover member 213.

[0029] A predetermined play (first gap) Y in a direction (radial direction) perpendicular to the optical axis direction is formed between the first lens holding member 212 and the cover member 213. Since the predetermined play Y is smaller than the overlap amount X of the cover member 213, even if the first lens holding member 212 or the cover member 213 moves by the predetermined play Y, the cover member 213 can cover the boundary 211D.

[0030] The cover member 213 is positioned in the optical axis direction with respect to the first lens holding member 212, and is therefore movable in the optical axis direction integrally with the first lens holding member 212. The outer diameter of the cover member 213 fits into the inner diameter of the opening 204F of the front exterior member 204. A backlash (second gap) formed between the front exterior member 204 and the cover member 213 by this fit in a direction perpendicular to the optical axis direction is minute and smaller than a predetermined backlash Y.

[0031] The cover member 213 has a rotation restriction key (projection) 213C, and the front exterior member 204 has a rotation restriction groove (groove) 204E corresponding to the rotation restriction key 213C. Thereby, when the front exterior member 204 is assembled, the rotation restriction key 213C fits into the rotation restriction groove 204E, and the rotation of the cover member 213 is restricted. Therefore, it is possible to prevent the cover member 213 from rotating and coming off the first lens group holding member 212. Note that the rotation restriction groove may be provided in the cover member 213, and the rotation restriction key may be provided in the front exterior member 204. That is, it is sufficient that one of the cover member 213 and the front exterior member 204 has the rotation restriction key, and the rotation groove is formed in the other.

[0032] The optical axis direction seal member 214 is a member for preventing drips and dusts, and is disposed between the surface (first surface) 213D on the imaging surface side of the cover member 213 and the surface (second surface) 212B on the subject side facing the surface 213D of the first group lens holding member 212, and seals the space between the surfaces 213D and 212B. It is preferable that the surfaces 213D and 212B are the entire circumference, but they may be only a part of the circumference. By sandwiching the optical axis direction seal member 214 in the optical axis direction, the cover member 213 and the first group lens holding member 212 are biased in the optical axis direction, and rattle in the optical axis direction can be reduced.

[0033] In order to maintain the predetermined backlash Y, the optical axis direction seal member 214 is disposed in a state in which a clearance (gap) larger than the predetermined backlash Y is formed between the cover member 213 and the first lens holding member 212 in a direction perpendicular to the optical axis direction. The optical axis direction seal member 214 is made of an elastically deformable material such as rubber or sponge, and is capable of absorbing the predetermined backlash Y.

[0034] The radial seal member 215 is a member for preventing drips and dusts, and is arranged in a state of being sandwiched between the cover member 213 and the opening 204F in a direction perpendicular to the optical axis direction. The radial seal member 215 on the right eye optical system 201R side is arranged at a position to block the effective light beam of the left eye optical system 201L, and the radial seal member 215 on the left eye optical system 201L side is arranged at a position to block the effective light beam of the right eye optical system 201R.

[0035] The above-described configuration makes it possible to realize a lens device 200 that is capable of achieving both dustproof and drip-proof performance and optical performance while maintaining the quality of the appearance, and that is capable of stereoscopic shooting at an angle of view exceeding 180 degrees. Since the first lens holding member 212 is not directly fitted to the opening 204F of the front exterior member 204, even if the first lens holding member 212 is misaligned due to the influence of manufacturing errors or the like, the position is not corrected. Therefore, the optical performance and the relative error between the right eye optical system 201R and the left eye optical system 201L do not change even when the front exterior member 204 is incorporated.

[0036] 9 is a diagram showing the positional relationship between each optical axis of the lens device 200 and the image circle on the image sensor 111. On the image sensor 111, a right-eye image circle ICR with an effective angle of view formed by the right-eye optical system 201R and a left-eye image circle ICL with an effective angle of view formed by the left-eye optical system 201L form images in parallel. It is preferable to set the diameter ΦD2 of the image circles and the distance between the image circles so that the image circles do not overlap as much as possible. For example, it is preferable to set the light receiving range of the image sensor 111 so that the center of the right-eye image circle ICR is approximately in the center of the right region of the region divided into left and right halves at the center, and set the center of the left-eye image circle ICL to be approximately in the center of the left region.

[0037] 9 is a diagram showing the positional relationship between each optical axis of the lens device 200 and the image circle on the image sensor 111. On the image sensor 111, a right-eye image circle ICR with an effective angle of view formed by the right-eye optical system 201R and a left-eye image circle ICL with an effective angle of view formed by the left-eye optical system 201L form images in parallel. It is preferable to set the diameter ΦD2 of the image circles and the distance between the image circles so that the image circles do not overlap as much as possible. For example, it is preferable to set the light receiving range of the image sensor 111 so that the center of the right-eye image circle ICR is located approximately in the center of the right region of the region divided into left and right halves at the center, and set the center of the left-eye image circle ICL to be located approximately in the center of the left region.

[0038] Moreover, each optical system is a wide-angle fisheye lens. In this embodiment, each optical system is a full-circle fisheye lens, and the image formed on the imaging surface is a circular image that captures a range of a field angle exceeding 180 degrees, and two circular images are formed on the left and right as shown in FIG. 9. The longer the distance (baseline length) L1 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, the greater the three-dimensional effect when viewed. For example, the size of the imaging element 111 is 24 mm vertical x 36 mm horizontal, the diameter ΦD2 of the image circle is 17 mm, the distance L2 between the third optical axes OA3R and OA3L is 18 mm, and the length of the second optical axis is 21 mm. If each optical system is arranged so that the second optical axis extends horizontally, the base line length L1 is 60 mm, which is approximately equal to the interpupillary distance of an adult. In addition, by making the diameter ΦD of the lens mount 202 shorter than the base line length L1 and making the distance L2 between the third optical axes shorter than the diameter ΦD of the lens mount 202, it becomes possible to arrange the lens arranged on the third optical axis inside the lens mount 202. When viewing as VR, it is said that the angle of view that provides a three-dimensional effect is about 120 degrees, but since a field of view of 120 degrees leaves a sense of incongruity, the angle of view is often widened to 180 degrees. In this embodiment, the effective angle of view exceeds 180 degrees, so the diameter ΦD2 of the image circle in this embodiment is larger than the diameter ΦD3 of the image circle with a field of view of 180 degrees.

[0039] FIG. 10 is a diagram showing the reflection of the left-eye optical system 201L when imaging is performed by the right-eye optical system 201R. The wall 204D of the front exterior member 204 is imaged inside the diameter ΦD2 of the image circle, which is the effective angle of view, but is not imaged at the angle of view of 180 degrees, and is imaged outside the diameter ΦD3 of the image circle with a range of an angle of view of 180 degrees. Therefore, when viewing as VR, there is no effect when viewing at an angle of view of 180 degrees. For example, within the effective angle of view of the right-eye optical system 201R, there are the first lens 211L of the left-eye optical system 201L of the left-eye region 20L, the cover member 213, and the wall 204D of the front exterior member 204, which are reflected in the actual effective imaging range as shown in FIG. 10. Only the first lens 211L is reflected within the image circle with a 180-degree angle of view (inside the diameter ΦD3), but the cover member 213 and the wall 204D are outside the image circle with a 180-degree angle of view. Furthermore, the reflection of the wall 204D is captured outside (to the left in FIG. 10) the apex of the first lens 211L when viewed in the horizontal direction. If the outside of the apex of the first lens 211L indicated by the straight line Z, which is inevitably reflected due to the specifications, is cut during image processing or editing, the reflection of the wall 204D will not have any effect. The same is true for the reflection of the right eye optical system 201R when imaging with the left eye optical system 201L. As described above, although the wall 204D is within the effective angle of view, it is arranged so as to have almost no effect on imaging for actual VR use.

[0040] Next, the filter configuration of the lens mount 202 will be described with reference to Figs. 11(a), (b) and 12(a), (b). Figs. 11(a) and (b) are exploded perspective views of a filter configuration that simultaneously retreats and advances with respect to two openings 301L and 301R provided in a mount cover 301, with the lens mount center O3 as the rotation center, as viewed from the subject side. Fig. 11(b) is an exploded perspective view of the filter configuration as viewed from the imaging surface side. As shown in Figs. 11(a) and (b), the lens mount 202 has a mount cover 301, a filter 302, a ring member (filter holding member) 303, a cover member 304, a gear 305, a motor 306, and a screw 307. Here, the filter 302 is an ND filter for reducing the amount of light taken in from the lens. It should be noted that the filter 302 is not limited to an ND filter, and may be, for example, a UV cut filter or a low pass filter.

[0041] The mount cover 301 is disposed on the inner periphery side of the lens mount 202, and is attached and fixed to the lens mount 202 by a locking claw (not shown). The mount cover 301 is formed with a right eye opening (first opening) 301R that opens to the right eye optical system 201R, and a left eye opening (second opening) 301L that opens to the left eye optical system 201L. The mount cover 301 also has a motor fixing portion 301a that fixes a motor 306 for driving the filter 302. The motor 306 is fixed to the motor fixing portion 301a by a screw 307.

[0042] The filter 302 is in the form of a film, and is held by the ring member 303 by engaging two holes 302b provided in the center with two protrusions 303b provided on the ring member 303. The ring member 303 has a total of four openings, including two openings 303d1 and two openings 303d2. The two openings 303d1 overlap the two openings 301R and 301L of the mount cover 301 when the filter 302 is inserted. The two openings 303d2 overlap the two openings 301R and 301L of the mount cover 301 when the filter 302 is retracted. The filter 302 is integrally formed so as to overlap the openings 303d1 and not overlap the openings 303d2. The filter 302 is disposed closer to the imaging surface than the motor 306.

[0043] The ring member 303 has an elongated hole 303a and a power transmission part 303c in which a gear is formed. A gear 305 is attached to the output shaft of a motor 306, and the gear 305 and the power transmission part 303c mesh with each other, so that the ring member 303 rotates 90 degrees around the lens mount center O3 by driving the motor 306. The elongated hole 303a is formed with an opening of 90 degrees or more so that the motor fixing part 301a does not interfere when the ring member rotates 90 degrees. In addition, the four openings 303d1 and 303d2 are formed so that the openings 301R and 301L and the opening 301d1 overlap at one rotation end, and the openings 301R and 301L and the opening 301d2 overlap at the other rotation end.

[0044] The ring member 303 is sandwiched between the mount cover 301 and the cover member 304. The cover member 304 is locked by fitting a fitting portion 304a into the motor fixing portion 301a of the mount cover 301, and is further locked with a gap by the inner bottom surface of the fitting portion 304a abutting against the upper surface of the motor fixing portion 301a. By appropriately providing the gap, the ring member 303 is fixed in the optical axis direction and is sandwiched so as to be rotatable about the lens mount center O3.

[0045] The cover member 304 also has a right-eye opening 304R, a left-eye opening 304L, and a cutout portion 304c. The two openings 304R, 304L are disposed at positions corresponding to the right-eye optical system 201R and the left-eye optical system 201L, respectively, and are formed at positions overlapping with the two openings 301R, 301L on the mount cover 301. The cutout portion 304c is cut out and disposed so as not to interfere with the power transmission portion 303c of the ring member 303, and is formed with an opening of 180 degrees or more so that the ring member can rotate 90 degrees.

[0046] FIG. 12(a) is a rear view showing a state in which the filter 302 has retreated from the two openings 304R and 304L. FIG. 12(b) is a rear view showing a state in which the filter 302 has entered the two openings 304R and 304L. In FIG. 12(a), when the opening 303d2 of the ring member 303 overlaps with the openings 304L and 304R of the cover member 304, the filter 302 is in a state in which it has retreated from the openings 304R and 304L. When the ring member 303 is rotated 90 degrees from the filter retreated state by the motor drive, the filter 302 also rotates 90 degrees, and as shown in FIG. 12(b), the filter 302 is in a state in which it has entered the openings 304R and 304L. This makes it possible to configure the filter 302 to simultaneously enter and retreat from two openings with different phases.

[0047] In this embodiment, the filter retracted state and the filter inserted state are switched by rotating the ring member 303 by 90 degrees, but the present invention is not limited to this. Also, in this embodiment, the ring member 303 is rotated by a motor drive, but the ring member 303 may be provided with a knob so that it can be manually operated from the outside.

[0048] Second embodiment Next, a filter configuration according to a second embodiment of the present invention will be described with reference to Figures 13(a), (b) and 14(a), (b). Note that in this embodiment, descriptions common to the first embodiment will be omitted.

[0049] Fig. 13(a) is an exploded perspective view of a filter configuration, seen from the subject side, in which blade-shaped filters 402 (402R, 402L) having cam grooves simultaneously retract and advance into two openings 401R, 401L provided in a mount cover 401. Fig. 13(b) is an exploded perspective view of the filter configuration, seen from the imaging surface side. The lens mount 202 has a mount cover 401, two filters 402R, 402L, a ring member (filter holding member) 403, a cover member 404, a gear 405, a motor 406, and a screw 407.

[0050] The mount cover 401 has two protrusions 401b in addition to the openings 401R and 401L and the motor fixing part 401a. The filter is composed of two members 402R and 402L, and the engagement holes 402b of each member engage with the protrusions 401b. The filters 402R and 402L have the same shape and are arranged point-symmetrically with respect to the lens mount center O4. Here, the filters 402R and 402L are ND filters. The two ND filters may have different densities. The filters are not limited to ND filters, and may be, for example, UV cut filters or low-pass filters. The filters 402R and 402L are arranged closer to the imaging surface than the motor 406. The filters 402R and 402L further have cam grooves 402c, which engage with two cam followers 403c provided on the ring member 403, respectively. The ring member has an opening 403e, which is formed so that within the rotation range of the ring member 403, the opening 403e does not overlap with the openings 401R and 402L of the mount cover.

[0051] The other configurations are the same as those of the first embodiment. The ring member 403 has an elongated hole 403a penetrating the motor fixing portion 401a, and a power transmission portion 403d in which a gear is formed. The elongated hole 403a is formed with an opening larger than the rotation angle of the ring member 403 so as not to interfere with the motor fixing portion 401a. The power transmission portion 403d meshes with the gear 405, and the ring member 403 rotates when the motor 406 is driven. The cover member 404 has two openings 404R and 404L overlapping the openings 401R and 401L, respectively, a fitting portion 404a that fits with the motor fixing portion 401a and is fixed to the mount cover 401, and a through hole 404d penetrating the power transmission portion 403d. The inner bottom surface of the fitting portion 304a comes into contact with the upper surface of the motor fixing portion 301a, and the mount cover 401 and the cover member 404 are engaged with a gap between them, so that the ring member 403 is fixed in the optical axis direction and is clamped so as to be rotatable about the lens mount center O3. The through-hole portion 404d is formed with an opening at least twice the rotation angle of the ring member 403 so as to prevent interference with the power transmission portion 403d.

[0052] Fig. 14(a) is a rear view showing a state in which the filters 402R, 402L are retracted from the two openings 404R, 404L, and Fig. 14(b) is a rear view showing a state in which the filters 402R, 402L are inserted into the two openings 404R, 404L.

[0053] As shown in Fig. 14(a) and (b), when the ring member 403 rotates around the lens mount center O4 as the rotation center, the two cam followers 403c move along the cam grooves 402c of the filters 402R and 402L. As a result, a rotational force is transmitted to the filters 402R and 402L. In Fig. 14(a), at one moving end of the cam follower 403c, the filter 402R retreats upward from the right opening 404R, and at the same time, the filter 402L retreats downward from the left opening 404L. When the ring member 403 rotates from this state by the motor drive, as shown in Fig. 14(b), the filter 402R enters the opening 404R along the cam follower 403c, and at the same time, the filter 402L enters the opening 404L. This makes it possible to configure a filter that simultaneously enters and retreats into two openings with different phases.

[0054] In this embodiment, the ring member 403 is rotated by driving a motor, but the ring member may have a knob so that it can be manually operated from the outside.

[0055] Third embodiment Next, a filter configuration according to a third embodiment of the present invention will be described with reference to Fig. 15(a), (b) and Fig. 16(a), (b). Note that in this embodiment, descriptions common to the above-mentioned embodiments will be omitted.

[0056] FIG. 15(a) is an exploded perspective view of a filter configuration in which a filter 502 simultaneously retracts and advances into two openings 501R and 501L provided in a mount cover 501 in a direction perpendicular to a line segment connecting the centers of the two openings, as viewed from the subject side. Here, the filter 502 is an ND filter. Note that the filter 502 is not limited to an ND filter, and may be, for example, a UV cut filter or a low-pass filter. FIG. 15(b) is an exploded perspective view of the filter configuration as viewed from the imaging surface side. The lens mount 202 has a mount cover 501, a filter 502, a translation member (filter holding member) 503, a cover member 504, a gear 505, a motor 506, and a screw 507.

[0057] The mount cover 501 has openings 501R and 501L and a motor fixing part 501a, and the motor 506 is fixed to the motor fixing part 501a by a screw 507. The filter 502 has two holes 502b, and is engaged and held by two protrusions 503b provided on the translation member 503. The filter 502 is formed long in the left-right direction and short in the up-down direction so that it can simultaneously block the openings 504R and 504L and can be retreated in the up-down direction. The filter 502 is disposed closer to the imaging surface than the motor 506. The translation member 503 has two openings 503d, and the filter 502 is disposed so as to block a part of the two openings 503d. The translation member 503 further has a straight guide part 503e, and by moving while abutting against a straight guide part 504e provided on the cover member 504, it is possible to move only in the direction perpendicular to the direction while being restricted to the direction connecting the centers of the two openings 501R and 501L.

[0058] The other configurations are the same as those of the first embodiment. The translation member 503 has an elongated hole 503a penetrating the motor fixing portion 501a, and a power transmission portion 503c in which a rack gear is formed. The elongated hole 503a is formed with an opening larger than the movement amount of the translation member 503 so as not to interfere with the motor fixing portion 501a. The power transmission portion 503d meshes with the gear 505, and the translation member 504 moves in translation by driving the motor 506. The cover member 504 has two openings 504R and 504L overlapping the openings 501R and 501L, respectively, a fitting portion 504a that fits with the motor fixing portion 501a and is fixed to the mount cover 501, and a through hole portion 504d penetrating the power transmission portion 503d. The inner bottom surface of the fitting portion 504a comes into contact with the upper surface of the motor fixing portion 501a, and the mount cover 501 and the cover member 504 are locked with a gap therebetween. Therefore, the translation member 503 is fixed in the optical axis direction and is sandwiched so as to be movable in a direction perpendicular to the direction connecting the centers of the two openings 501R and 501L. The through-hole portion 504d is formed with an opening that is at least twice the movement amount of the translation member 503 so as not to interfere with the power transmission portion 503d.

[0059] Fig. 16(a) is a rear view showing a state in which the filter 502 has retreated from the two openings 501R and 501L, and Fig. 16(b) is a rear view showing a state in which the filter 502 has entered the two openings 501R and 501L.

[0060] As shown in Fig. 16(a), filter 502 retracts in the Y direction relative to openings 504R and 504L. When motor 506 is driven from the filter retracted state, translation member 503 and filter 502 translate integrally in the Y direction via gear 505. Filter 502 is shaped to cover two openings as described above, and as shown in Fig. 16(b), it simultaneously enters two openings 504R and 504L. This makes it possible to configure a filter that simultaneously enters and retracts from two openings that are out of phase with each other.

[0061] In this embodiment, the translation member is rotated by driving a motor, but the translation member may be provided with a knob so that it can be manually operated from the outside.

[0062] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to Figures 17(a) to (c), 18(a) to (c), and 19(a) to (c). Note that in this embodiment, descriptions common to the previous embodiments will be omitted.

[0063] FIG. 17(a) is a perspective view of a filter holder (filter holding member) 603. FIG. 17(b) is a perspective view of the filter holder 603 with a filter 602 attached. Here, the filter 602 is an ND filter. It is to be noted that the filter 602 is not limited to an ND filter, and may be, for example, an UV cut filter or a low pass filter. FIG. 17(c) is a perspective view seen from the opposite side to FIG. 17(b). 603a are two openings formed corresponding to the two optical systems on the left and right, through which light beams pass. 603b are filter holders, three of which are arranged on the top and bottom of the figure. 603c are side walls, which are located at positions facing each other on the top and bottom, and the filter 602 is inserted so as to be sandwiched between the open portion of the opening 603a and the slit formed by the side wall 603b and the filter holder 603c, as shown in FIG. 17(b). After the filter 602 is sandwiched, the user does not need to touch the filter 602 by grabbing the surrounding parts of the filter holder 603. As shown in FIG. 17(c), four bayonet claws 603d are formed integrally with the filter holder 603.

[0064] FIG. 18(a) is a perspective view of the mount cover 601. The mount cover 601 has four bayonet claw hooks 601b integrally formed thereon for hooking the bayonet claws 603d. FIG. 18(b) is a rear view of the mount cover 601 with the filter holder 603 attached with a filter. FIG. 18(c) is a perspective view of the mount cover 601 with the filter holder 603 attached with a filter. As shown in FIG. 18(b) and (c), the bayonet claws 603d on the flange of the filter holder 603 rotate and enter the bayonet claw hooks 601b of the mount cover 601 due to the bayonet structure, so that they overlap in the optical axis direction. In addition, the inner diameter of the inside of the bayonet claws 603d and the outer diameter of the bayonet claw hooks 601b fit together in the direction perpendicular to the rotation axis, so that they are fixed. This allows the user to attach the filter 602 to the mount cover 601 on the image plane side of the lens apparatus 200 without directly touching the filter 602 .

[0065] 19(a) is a front view of a dust cap (protective member) 610 attached to the lens mount 202 to cover the mount cover 601 etc. Reference numeral 610a denotes four bayonet claw hooks, which are formed by inner slide molding to have the same shape as the bayonet claw hooks 601b formed integrally with the mount cover 601.

[0066] 19(b) is a perspective view showing a state in which the filter holder 603 is attached to the bayonet claw hook 610a of the dust cap 610. With the filter 602 sandwiched and held by the filter holder 603, the user can store the filter 602 together with the filter holder 603 in the dust cap 610 by touching the filter holder 603 without directly touching the filter 602. The dust cap 610 for protecting the lens device 200 is paired with a body cap 611 for protecting the mount section of the camera body 110.

[0067] Fig. 19(c) is a perspective view showing a state in which a body cap 611 that can be attached to the camera body 110 is attached to the dust cap 610. As shown in Fig. 19(c), the body cap 611 and the dust cap 610 can be rotated and fixed by a bayonet mechanism. By covering the dust cap 610 with the body cap 611 in this way, the filter 602 is stored and sealed inside, making it possible to prevent the adhesion of dust and the like.

[0068] Fifth embodiment Next, a fifth embodiment of the present invention will be described with reference to Fig. 20 and Fig. 21(a) and (b). This embodiment is a modification of the fourth embodiment, in which the method of fixing the filter to the filter holder is changed. Note that in this embodiment, descriptions common to the previous embodiments will be omitted.

[0069] Fig. 20 is an exploded perspective view of a filter holder unit that holds a filter. Fig. 21(a) is a perspective view of the filter holder unit. Fig. 21(b) is a perspective view of mount cover 651 in a state in which a filter holder unit with a filter 652 attached is attached. Here, filter 652 is an ND filter. Note that the filter is not limited to an ND filter, and may be, for example, a UV cut filter or a low pass filter.

[0070] As shown in FIG. 20, a filter holder (filter holding member) 653 and a filter holder cover (lid member) 654 are provided. The filter 652 is fixed by sandwiching the filter 652 between the filter holder 653 and the filter holder cover 654. The filter holder 653 has four dowels (projections) 653e integrally formed therewith. The filter holder cover 654 has holes 654a at positions corresponding to the dowels 653e. By lightly pressing the dowels 653e at the four positions into the holes 654a, a filter holder unit as shown in FIG. 21(a) can be configured, and the filter holder 653 and the filter holder cover 654 can be prevented from being misaligned. Furthermore, since the filter holder 653 has the dowels 653e, the filter holder 653 can be prevented from being attached upside down to the mount cover 651.

[0071] Since the filter holder 653 is integrally formed with a bayonet claw 653d, as shown in FIG. 21(b), the bayonet claw 653d can be rotated and attached to the bayonet claw hook 651b of the mount cover 651. The filter holder unit can be attached to the image surface side of the lens device 200 by the same bayonet mechanism as in the fourth embodiment. In addition, the dowel 653e penetrates through the hole 654a and protrudes in the filter holder unit state. Therefore, even if the filter holder unit is attached upside down, the bayonet claw from which the dowel 653e protrudes floats and cannot be caught, so that erroneous assembly due to upside down is not possible. Note that, like the fourth embodiment, it can be stored in the mount cap and body cap when removed.

[0072] Sixth embodiment Next, a sixth embodiment of the present invention will be described with reference to Fig. 22 and Fig. 23(a) to (c). This embodiment is a modification of the fifth embodiment, in which the method of fixing the filter holder to the lens device 200 is changed. Note that in this embodiment, descriptions common to the previous embodiments will be omitted.

[0073] Fig. 22 is a perspective view of the filter holder unit in this embodiment. Fig. 23(a) is a perspective view of the mount cover 701. Fig. 23(b) is a rear view of the mount cover 701 in a state in which the filter holder unit with the filter attached is attached. Fig. 23(c) is a perspective view of the mount cover 701 in a state in which the filter holder unit with the filter attached is attached.

[0074] FIG. 22 shows a state where a filter 702 is sandwiched between a filter holder cover 704 and a filter holder (filter holding member) 703 constituting a filter holding member, and the filter 702 is made into a unit. Here, the filter 702 is an ND filter. It is not limited to an ND filter, and may be, for example, a UV cut filter or a low pass filter. As in the fifth embodiment, the filter holder unit is formed by lightly press-fitting four dowels 703e into holes 704a. The difference from the fifth embodiment is that the filter holder 703 does not have a bayonet claw, and instead, a magnet 704b is insert-molded into the filter holder cover 704.

[0075] The mount cover 701 shown in Fig. 23(a) is configured by integrating a metal iron piece 701e by insert molding at a position corresponding to the magnet 704b of the filter holder cover 704. As shown in Fig. 23(b) and (c), the filter holder unit can be attracted and fixed to the portion of the mount cover 701 where the iron piece 701e is located by the magnetic force of the magnet 704b of the filter holder unit. Also, as in the fourth and fifth embodiments, when the filter holder unit is removed, it can be stored in the mount cap and the body cap by attaching an iron piece similar to the mount cover 701 to a corresponding position on the mount cap side.

[0076] Seventh embodiment Next, a seventh embodiment of the present invention will be described with reference to Figures 24(a), (b) and 25(a), (b). This embodiment is a modification of the fourth embodiment, in which the method of fixing the filter holder to the lens device 200 is changed. Note that in this embodiment, descriptions common to the previous embodiments will be omitted.

[0077] Fig. 24(a) is a perspective view of filter holder (filter holding member) 803. Fig. 24(b) is a perspective view of filter holder 803 seen from the opposite direction. Fig. 25(a) is a perspective view of mount cover 801. Fig. 25(b) is a perspective view of filter holder 803 with a filter attached.

[0078] In the filter holder 803 shown in Figures 24(a) and (b), 803b are filter holders arranged three above and three below in the figure. 803c are located at opposing positions on the side walls, and the filter 802 can be inserted so as to be sandwiched between the portion where the opening 803a is open and the slit formed by the side walls 803b and the filter holders 803c, as in the fourth embodiment. Here, the filter 802 is an ND filter. It is to be noted that the filter 802 is not limited to an ND filter, and may be, for example, a UV cut filter or a low pass filter.

[0079] Reference numeral 803e denotes a screw hole for passing a screw. As shown in FIG. 25(a), mount cover 801 has screw seat 801f for screwing in a self-tapping screw. As shown in FIG. 25(b), filter holder 803 with filter 802 attached can be fixed by passing screw 805 through screw hole 803e of filter holder 803 and fastening it to screw seat 801f. Also, as in the fourth embodiment, when the filter holder unit is removed, a screw seat similar to mount cover 801 is provided at a corresponding position on the mount cap side, so that the filter holder unit can be stored in the mount cap and body cap and fixed by screw fastening.

[0080] Eighth embodiment Next, an eighth embodiment of the present invention will be described with reference to Figs. 26(a)-(c), 27(a), (b), and 28. This embodiment is a modification of the fifth embodiment, in which the method of fixing the filter to the filter holder is changed. Note that in this embodiment, descriptions common to the previous embodiments will be omitted.

[0081] FIG. 26(a) is a perspective view of a filter holder unit that holds a filter 902. Here, the filter 902 is an ND filter. It is to be noted that the filter 902 is not limited to an ND filter, and may be, for example, a UV cut filter or a low pass filter. FIG. 26(b) is a perspective view of a mount cover 901 at the rear end of the interchangeable lens. FIG. 26(c) is a perspective view of the whole including the mount cover 901 in a state in which a filter holder unit that does not include a filter 902 is attached. FIGS. 27(a) and 27(b) are exploded perspective views of the filter holder unit that holds the filter 902. In FIG. 27(b), only the bayonet mechanism portion of the mount cover 901 is illustrated. FIG. 28 is a perspective view of the whole including the mount cover 901 in a state in which a filter holder unit with a filter 902 attached is attached.

[0082] As shown in Fig. 27(a) and (b), the filter 902 is fixed by being sandwiched between a filter holder (first member) 903 and a filter holder cover (pressing ring, second member) 904. In this embodiment, the filter holder 903 and the filter holder cover 904 are filter holding members that hold the filter 902. As shown in Fig. 27(a), the filter holder 903 is integrally formed with an M30.5 female screw (female screw portion) 903e, and an unthreaded flange portion 903f is provided at the end of the female screw 903e. As shown in Fig. 27(b), the filter holder cover 904 is provided with an M30.5 male screw (male screw portion) 904a at a position corresponding to the female screw 903e. By screwing the male screw 904a into the female screw 903e (screw-engaging the male screw 904a with the female screw 903e), a filter holder unit as shown in Fig. 27(a) can be configured. The filter holder cover 904 is configured to be assembled from the subject direction. The flange portion 903f determines the position of the filter holder cover 904 relative to the filter holder 903 when the filter holder cover 904 is attached to the filter holder 903. Note that in this embodiment, the filter 902 may be fixed by screwing into the female screw 903e of the filter holder 903.

[0083] Filter holder 903 has flange portion 903f, which prevents filter holder cover 904 from being screwed onto filter holder 903 from the opposite direction with the front and back facing upside down. Filter holder 903 also has two operating portions 903h. Bayonet claws 903b are integrally formed on only one side of each of the two operating portions 903h, which prevents filter holder 903 from being attached to mount cover 901 upside down.

[0084] The filter holder 903 has a total of four bayonet mechanisms since the bayonet claw 903d is integrally formed in addition to the bayonet claw 903b. As shown in Figs. 26(a) and 26(b), the bayonet claw 903b can be attached to the bayonet claw hook 901b of the mount cover 901, and the bayonet claw 903d can be attached to the bayonet claw hook 901d by rotating each of them. The same bayonet mechanism as in the fifth embodiment makes it possible to attach the unitized filter holder unit to the image surface side of the lens device 200. In addition, the stopper portion 903g protrudes in the filter holder unit state. Therefore, even if the filter holder unit is attached upside down, the bayonet claws protruding from the stopper portion 903g float and are not caught, so erroneous assembly due to upside down is not possible. Note that, like the fifth embodiment, it is possible to store the filter holder unit in the mount cap and the body cap when it is removed.

[0085] So far, we have explained a form in which a thin sheet-like filter called a gelatin filter or the like is attached. Meanwhile, since filter holder 903 is integrally molded with M30.5 female thread 903e, it is possible to attach a commercially available screw-in type glass filter that is thicker than a sheet-like filter.

[0086] The embodiment will be described below with reference to Figs. 29(a) and (b) to 32(a) and (b). Figs. 29(a) and (b) are exploded perspective views of a filter holder unit that holds a filter. In Fig. 29(b), only the bayonet mechanism of the mount cover 901 is shown. Fig. 30 is a perspective view of the whole including the mount cover 901 in a state where the filter holder unit with the screw filter 910 attached is attached. Fig. 31 is a cross-sectional view of the whole lens barrel in a state where the screw filter 910 is attached. Figs. 32(a) and (b) are front views of the filter holder unit and the mount cover 901.

[0087] Filter holder 903 has flange portion 903f. Therefore, screw filter 910 can be attached only from the subject direction. In addition, since the filter holder unit cannot be attached upside down, even if a thick commercially available glass filter is attached, it will not protrude toward the subject. Therefore, the glass filter will not enter the camera side and collide with the shutter inside the camera.

[0088] As shown in FIG. 26(a) and FIG. 32(a) and (b), the filter holder 903 is provided with a finger hook 903h. The finger hook 903h can be grasped and rotated to perform bayonet attachment and removal. On the other hand, the mount cover 901 is provided with a wall 901i, and the mount's electrical contacts 909 are arranged in the same phase as the wall 901i on one side. Since the finger hook 903h can be rotated only in the phase where the wall 901i is not present, it is possible to prevent the fingers grasping the hook 903h from coming into contact with the mount contacts when the filter holder is attached or removed. As a result, the electrical contacts 909 are not touched by fingers, so the electrical contacts are not soiled, and communication failures and the like can be prevented.

[0089] Regarding focusing, sheet-like gelatin filters are generally less than 0.1 mm thick, and the amount of focus deviation is about a fraction of that, which is not very large. However, commercially available glass filters are generally about 2 mm thick, and when attached to the image plane side, the back focus changes by 1 part of the thickness times the refractive index of the glass, roughly estimating about 0.7 mm. This can be addressed by making the focus stroke longer on the extension side for full extension, as shown in FIG. 31. The extension amount is set longer by an amount that takes into account the refractive index and the thickness of the glass, and the focus position can be addressed by changing the extension depending on whether or not there is a glass screw filter 910. It is possible to manually set the mode and switch, but it is also possible to switch using a sensor.

[0090] As shown in Fig. 32(a) and (b), an opening hole 911h is formed in the mount cover 911, and a photoreflector (detection means) 915 is disposed inside the opening hole 911h facing the image surface side. With this configuration, it is possible to detect whether a filter such as a glass filter is attached or not by whether infrared light (reflected light) emitted from the photoreflector 915 is received or not. The glass filter and the gelatin filter have different thicknesses, and in the case of a sheet-like gelatin filter, it is disposed at a position near the flange portion 903f at the back of the female thread 903e, that is, on the image surface side. Therefore, as the distance from the photoreflector 915 increases, the position of the reflecting surface becomes farther away, and the intensity of the light received by the photoreflector 915 changes, so there is no risk of erroneous detection.

[0091] According to this embodiment, it is possible to selectively attach a sheet-shaped gelatin filter or a glass screw filter, and the extension amount can be changed according to changes in focus.

[0092] According to each embodiment, it is possible to provide a lens device and an imaging device that allow easy installation and removal of a filter. Also, according to the configuration of each embodiment, it is possible to prevent the filter from becoming dirty or scratched, or from being deformed, when the filter is installed or removed. Also, according to the configuration of each embodiment, when the filter is removed, the filter holding member can be stored in the mount cap by fixing the filter to the dust cap with a bayonet and then covering it with a body cap, so that it is less likely to become dirty and care after removal is not required.

[0093] The disclosure of each embodiment includes the following configurations.

[0094] (Configuration 1) A lens mount for attaching the camera body, a mount cover provided on the lens mount; A filter, A filter holding member that holds the filter, The lens device according to claim 1, wherein the filter holding member is configured to be attachable to the mount cover. (Configuration 2) 2. The lens device according to claim 1, wherein the mount cover is disposed on the inner periphery side of the lens mount. (Configuration 3) 3. The lens device according to claim 1, wherein the filter is in the form of a film. (Configuration 4) a protective member for protecting an image surface side of the lens device; 4. The lens device according to any one of configurations 1 to 3, wherein the filter holding member is configured to be attachable to the protection member in a state where the filter holding member is detached from the mount cover. (Configuration 5) The filter holding member further includes a cover member, 5. The lens device according to any one of configurations 1 to 4, wherein the filter is fixed by being sandwiched between the filter holding member and the cover member. (Configuration 6) 6. The lens device according to any one of configurations 1 to 5, wherein the filter holding member has a protrusion that prevents the filter holding member from being attached upside down to the mount cover. (Configuration 7) Further comprising a first optical system and a second optical system, The lens device described in any one of configurations 1 to 6, characterized in that the mount cover is formed with a first opening that opens to the first optical system and a second opening that opens to the second optical system. (Configuration 8) The lens device according to configuration 7, wherein the filter holding member is configured so that the filter can be inserted into or removed from the first opening and the second opening simultaneously. (Configuration 9) 9. The lens device according to any one of configurations 1 to 8, wherein the filter holding member is configured to be attachable to the mount cover by a bayonet structure. (Configuration 10) 9. The lens device according to any one of configurations 1 to 8, wherein the filter holding member is configured to be attachable to the mount cover by magnetic force. (Configuration 11) 9. The lens device according to any one of configurations 1 to 8, wherein the filter holding member is configured to be attachable to the mount cover by fastening with a screw. (Configuration 12) 10. The lens device according to any one of configurations 1 to 9, wherein the filter holding member has a female thread portion. (Configuration 13) 13. The lens device according to configuration 12, wherein the filter is fixed by being screwed into the female thread portion of the filter holding member. (Configuration 14) The filter holding member has a first member having a female thread portion and a second member having a male thread portion, 10. The lens device according to any one of configurations 1 to 9, wherein the filter is fixed by clamping the filter by screwing the female threaded portion and the male threaded portion together. (Configuration 15) 15. The lens device according to configuration 14, wherein the second member is configured to be assembled from the subject side. (Configuration 16) 16. The lens device according to aspect 14 or 15, wherein the first member has a flange portion that determines the position of the second member. (Configuration 17) 17. The lens device according to any one of configurations 1 to 16, further comprising a detection means for detecting that the filter has been attached. (Configuration 18) An imaging element; An imaging device comprising: a lens device according to any one of configurations 1 to 17. (Configuration 19) 19. The imaging device according to configuration 18, wherein the imaging element simultaneously captures two images with parallax formed by the first optical system and the second optical system.

[0095] 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]

[0096] 110 Camera body 200 Lens device 202 Lens mount 301, 401, 501, 601, 651, 701, 801, 901 Mount Cover 302, 402, 502, 602, 652, 702, 802, 902 Filters 303, 403 Ring member (filter holding member) 503 Translational member (filter holding member) 603, 653, 703, 803, 903 Filter holder (filter holding member) 904 Filter holder cover (filter holding member) 910 Screw filter (filter)

Claims

1. A first optical system and a second optical system, A lens mount for attaching and detaching a lens device to the camera mount of an imaging device, A mount cover provided on the aforementioned lens mount, Filters and, It has a filter holding member that holds the filter, The imaging device has an image sensor that simultaneously captures two images formed by the first optical system and the second optical system. The lens device is characterized in that the filter holding member is configured to be attachable to the mount cover.

2. The lens device according to claim 1, characterized in that the mount cover is arranged on the inner circumference side of the lens mount.

3. The lens device according to claim 1, characterized in that the filter is in the form of a film.

4. The lens device further includes a protective member that protects the image plane side, The lens device according to claim 1, characterized in that the filter holding member is configured to be attachable to the protective member when it is removed from the mount cover.

5. The filter holding member further comprises a lid member, The lens device according to claim 1, characterized in that the filter is fixed by being sandwiched between the filter holding member and the lid member.

6. The lens device according to claim 1, characterized in that the filter holding member has a projection that prevents it from being attached to the mount cover upside down.

7. The lens device according to claim 1, characterized in that the mount cover has a first opening that opens to the first optical system and a second opening that opens to the second optical system.

8. The lens device according to claim 7, characterized in that the filter holding member is configured to allow the filter to enter or retract simultaneously into the first opening and the second opening.

9. The lens device according to claim 1, characterized in that the filter holding member is configured to be attachable to the mount cover by a bayonet structure.

10. The lens device according to claim 1, characterized in that the filter holding member is configured to be attachable to the mount cover by magnetic force.

11. The lens device according to claim 1, characterized in that the filter holding member is configured to be attachable to the mount cover by screw fastening.

12. The lens device according to claim 1, characterized in that the filter holding member has a female screw portion.

13. The lens device according to claim 12, characterized in that the filter is fixed by screwing it into the female screw portion of the filter holding member.

14. The filter holding member comprises a first member having a female screw portion and a second member having a male screw portion. The lens device according to claim 1, characterized in that the filter is fixed by the female screw portion and the male screw portion screwing into each other and sandwiching the filter.

15. The lens device according to claim 14, characterized in that the second member is configured to be incorporated from the direction of the subject.

16. The lens device according to claim 14, characterized in that the first member has a flange portion that determines the position of the second member.

17. The lens device according to claim 1, further comprising a detection means for detecting that the filter has been attached.

18. Image sensor and An imaging device comprising a lens device according to any one of claims 1 to 17.

19. The imaging apparatus according to claim 18, characterized in that the two images simultaneously captured by the image sensor have a parallax between them.