Mount adapter

Abstract

To properly set the focusing position of an imaging device and an interchangeable lens even when the imaging device has a longer flange back than the interchangeable lens.SOLUTION: A mount adapter is arranged between an interchangeable lens and an imaging device, and has a first mount surface which faces a mount surface of the interchangeable lens when the interchangeable lens is mounted, and a second mount surface which faces a mount surface of the imaging device when the imaging device is mounted, wherein the first mount surface is located closer to an imaging surface of the imaging device than the second mount surface with the interchangeable lens and imaging device mounted.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] Regarding the mount adapter. [Background technology]

[0002] In an interchangeable lens camera system that has a camera body and an interchangeable lens (lens device) that can be attached to and detached from the camera body, imaging is possible through various types of optical systems by changing the interchangeable lens attached to the camera body.

[0003] When using an interchangeable lens with a mount standard different from that of the camera body, a mount adapter is attached between the camera body and the interchangeable lens. This makes it possible to set the focus position appropriately even if the flange backs of the camera body and the interchangeable lens are different (see, for example, Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-66813 A Summary of the Invention

[0005] According to the first aspect, the mount adapter is a mount adapter disposed between an interchangeable lens and an imaging device, and has a first mount surface that faces the mount surface of the interchangeable lens when the interchangeable lens is attached, and a second mount surface that faces the mount surface of the imaging device when the imaging device is attached, and when the interchangeable lens and the imaging device are attached, the first mount surface is located closer to the imaging surface of the imaging device than the second mount surface.

[0006] According to a second aspect, the mount adapter is a mount adapter disposed between an interchangeable lens and an imaging device, and has a first mount surface that faces the mount surface of the interchangeable lens when the interchangeable lens is attached, and a second mount surface that faces the mount surface of the imaging device when the imaging device is attached, and when the interchangeable lens and the imaging device are attached, the length from the first mount surface to the imaging surface of the imaging device is shorter than the length from the second mount surface to the imaging surface.

[0007] The configurations of the embodiments described below may be appropriately improved, and at least a part of them may be replaced with other components. Furthermore, components that are not particularly limited in terms of their location may be located in any position that can achieve their function, not limited to the location disclosed in the embodiments. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a camera system according to a first embodiment, illustrating a state in which an interchangeable lens, a camera, and a mount adapter are separated. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of the camera system according to the first embodiment, illustrating a state in which an interchangeable lens, a camera, and a mount adapter are integrated together. [Diagram 3] FIG. 3 is a schematic diagram showing the configuration of the camera system according to the first embodiment, in which the camera is shown filled in gray and the mount adapter is shown by a dashed line in the state shown in FIG. [Figure 4] FIG. 4(a) is a diagram showing the mount adapter according to the first embodiment as viewed from the +Z side, and FIG. 4(b) is a cross-sectional view taken along line AA in FIG. 4(a). [Diagram 5] FIG. 5 is a diagram showing the mount adapter according to the first embodiment as viewed from the -Z side. [Figure 6] FIG. 6(a) is a diagram showing a state in which the rear cover is removed from FIG. 5, and FIG. 6(b) is a diagram showing a state in which the mount adapter is viewed from the +Y direction. [Figure 7] FIG. 7 is a perspective view of the first embodiment, in which the first member, the second member, and the camera are separated (the camera is not attached), as viewed from the -Z direction. [Figure 8] FIG. 8 is a perspective view of the state of FIG. 7 as seen from the +Z direction. [Figure 9] FIG. 9 is a cross-sectional view showing a state in which the camera to which the second member is attached is inserted into the first member in the first embodiment. [Figure 10] FIG. 10 is a diagram of the mount adapter to which the camera is attached, viewed from the +Z direction, in the first embodiment. [Figure 11] FIG. 11 is a diagram showing various dimensions of the mount adapter according to the first embodiment. [Figure 12] FIG. 12 is a perspective view showing a mount adapter and a camera according to the second embodiment. [Figure 13] FIG. 13 is a cross-sectional view showing a state in which the camera is attached to the mount adaptor in the second embodiment. [Figure 14] FIG. 14 is a diagram showing various dimensions of the mount adapter according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] First Embodiment Hereinafter, a camera system 100 according to a first embodiment will be described with reference to the drawings. Note that the scale of the shape, length, thickness, and the like of each part shown in the embodiment does not necessarily match the actual one, and parts that are not necessary for the explanation are appropriately omitted or simplified.

[0010] 1 to 3 are schematic diagrams showing a configuration of a camera system 100 according to a first embodiment. The camera system 100 includes an interchangeable lens 20, a camera (imaging device) 10, and a mount adapter 30. FIG. 1 shows a state in which the interchangeable lens 20, the camera 10, and the mount adapter 30 are separated, and FIG. 2 shows a state in which the interchangeable lens 20, the camera 10, and the mount adapter 30 are integrated. FIG. 3 shows the camera 10 in the state shown in FIG. 2, filled in gray, and the mount adapter 30 in dashed lines. In FIGS. 1 to 3, the optical axis direction of the interchangeable lens 20 is the Z-axis direction, the up-down direction in the plane of the paper is the X-axis direction, and the direction perpendicular to the plane of the paper is the Y-axis direction.

[0011] (Camera 10) The camera 10 includes an imaging element and a control unit. The imaging element includes a photoelectric conversion element such as a CCD (Charge Coupled Device) and converts a subject image formed by an imaging optical system (interchangeable lens 20 attached to the camera 10) into an electrical signal. In the first embodiment, the flange back of the camera 10 (the distance from the mount surface (end surface on the +Z side) of the camera 10 to the imaging element (imaging surface) (see symbol "FB2" in FIG. 3)) is 17.526 mm.

[0012] The control unit includes a CPU (Central Processing Unit) and the like, and controls the overall operation of the camera 10.

[0013] (20 interchangeable lenses) As shown in FIG. 1, the interchangeable lens 20 includes a fixed barrel 21, a focus ring FR, a zoom ring ZR, and a control ring CR. The interchangeable lens 20 does not necessarily have to include at least one of the focus ring FR, the zoom ring ZR, and the control ring CR. The interchangeable lens 20 includes a plurality of lens groups arranged in sequence along a common optical axis. The lens groups include a zoom lens group, a vibration reduction (VR) lens group, a focus lens group, and an aperture unit. Each lens group may be composed of one lens or a plurality of lenses. The interchangeable lens 20 includes a lens driving device that drives each lens group, and the lens driving device is driven and controlled by a lens control device 22 (see FIG. 2).

[0014] A lens mount 23 is provided on the +Z side of the fixed barrel 21. The lens mount 23 has a bayonet-type mount claw, and the interchangeable lens 20 is attached to the lens mount 23 by engaging the mount claw of the lens mount 23 with a claw attachment portion 43 (see FIG. 4(a) etc.) provided on the mount adapter 30. In the first embodiment, the surface on the -Z side of the lens mount 23 is the mount surface 23a. Also, the flange back (the distance from the mount surface 23a of the interchangeable lens 20 to the imaging element (imaging surface) (see symbol "FB1" in FIG. 3)) is 16 mm.

[0015] (Mount adapter 30) The mount adapter 30 is a device that is interposed between the interchangeable lens 20 and the camera 10, thereby enabling the interchangeable lens 20 to be attached to the camera 10. In the first embodiment, the mount adapter 30 includes a first member 31 and a second member 32, as shown in Fig. 1. When attaching the camera 10 to the mount adapter 30, the second member 32 is attached to the camera 10, and then the second member 32 with the camera 10 attached thereto is attached to the first member 31.

[0016] Fig. 4(a) is a diagram showing the mount adapter 30 as viewed from the +Z side, and Fig. 4(b) is a cross-sectional view taken along line AA in Fig. 4(a). Fig. 4(a) and Fig. 4(b) show a state in which the second member 32 is attached to the first member 31.

[0017] As shown in Figures 4(a) and 4(b), the first member 31 includes a main body portion 40. In order to make it easier to understand the shape and the like of the main body portion 40, the main body portion 40 is shown in gray in Figure 4(a), and the cross section of the main body portion 40 is shown painted black in Figure 4(b).

[0018] A generally cylindrical portion (hereinafter referred to as the cylindrical portion) 140 protruding in the +Z direction is provided in the center of the main body 40. A circular opening 142 is formed at the end on the +Z side of the cylindrical portion 140. Also, cutout portions 144 are formed at generally equal intervals in the circumferential direction at the end on the -Z side of the cylindrical portion 140. The cutout portions 144 penetrate the cylindrical portion 140 from the inside to the outside.

[0019] The second member 32 is attached (screwed) to the vicinity of the end of the inner +Z side of the cylindrical portion 140 by a plurality of (e.g., three) screws (fixing screws) 39. A groove is formed in the outer periphery of the second member 32 along the circumferential direction. When the second member 32 is attached to the first member 31, the tip of the screw 39 screwed from the outside of the cylindrical portion 140 fits into the groove of the second member 32, thereby fixing the second member 32 to the first member 31. In this way, by providing a groove on the outer periphery of the second member 32, the second member 32 can be fixed to the first member 31 regardless of the position of the second member 32 around the Z axis.

[0020] A substantially annular mount member 42 is provided on the +Z side near the outer edge of the main body 40. Four claw attachment portions 43 are provided on the inside of the mount member 42. The mount claws of the lens mount 23 of the interchangeable lens 20 engage with the claw attachment portions 43. The surface on the +Z side of the mount member 42 is a first mount surface M1 that faces the mount surface 23a (see FIG. 1) of the interchangeable lens 20 when the interchangeable lens 20 is attached.

[0021] A detachable pin 44 is provided on a part of the mount member 42, and a detachable knob 46 is connected to the detachable pin 44. When the detachable knob 46 is not operated, the detachable pin 44 protrudes from the first mount surface M1, but when the detachable knob 46 is operated, the detachable pin 44 enters the first mount surface M1 (does not protrude). For example, when the interchangeable lens 20 is attached to the mount adapter 30 and the detachable knob 46 is not operated, the detachable pin 44 protruding from the first mount surface M1 is inserted into a hole (not shown) on the interchangeable lens 20 side. In this state, the interchangeable lens 20 cannot rotate relative to the mount adapter 30, and therefore the interchangeable lens 20 cannot be removed from the mount adapter 30. On the other hand, when the detachable knob 46 is operated, the detachable pin 44 comes out of the hole (not shown) on the interchangeable lens 20 side, and therefore the interchangeable lens 20 can rotate relative to the mount adapter 30, and the interchangeable lens 20 can be removed from the mount adapter 30.

[0022] 4(a), a connection terminal 48 is provided on the +X side of the cylindrical portion 140 of the main body 40. The connection terminal 48 is connected to a connection terminal (not shown) on the interchangeable lens 20 side when the interchangeable lens 20 is attached.

[0023] Fig. 5 is a diagram showing the mount adapter 30 as viewed from the -Z side. As shown in Fig. 5, a rear cover 50 is provided inside the main body 40 of the mount adapter 30 (first member 31). A substantially octagonal opening 150 through which the camera 10 can be inserted is provided in the center of the rear cover 50. Note that the shape of this opening 150 may be a shape other than a substantially octagon, such as a circle, depending on the form of the camera 10.

[0024] FIG. 6(a) is a diagram showing a state in which the rear cover 50 is removed from FIG. 5. FIG. 6(b) is a diagram showing a state in which the mount adapter 30 is viewed from the +Y direction. As shown in FIG. 6(a), a substantially circular printed circuit board (PCB) 52 is provided on the +Z side of the rear cover 50. The printed circuit board 52 does not have to be substantially circular, and may have other shapes such as a semicircle. A substantially octagonal opening 152 through which the camera 10 can be inserted is provided in the center of the printed circuit board 52. The lens communication circuit 350 shown in FIG. 2 is mounted on the printed circuit board 52.

[0025] As shown in Fig. 6(a), one end of a flexible printed circuit board (FPC) 56 is connected to the -Z side surface of the printed circuit board 52 via a connector 54. The other end of the flexible printed circuit board 56 is connected to the connection terminal 48 on the +Z side of the printed circuit board 52 (see Fig. 4(b)).

[0026] A connector (e.g., a USB connector) 58 is provided near the end of the printed circuit board 52 on the +Y side. As shown in Fig. 6(b), the connector 58 is exposed on the outer circumferential surface of the main body 40. A cable (USB cable) 92 connected to a PC 90 (external device) shown in Fig. 2 is connected to the connector 58.

[0027] FIG. 7 is a perspective view of the first member 31, the second member 32, and the camera 10 in a separated state (a state in which the camera 10 is not attached) as viewed from the -Z direction. FIG. 8 is a perspective view of the state of FIG. 7 as viewed from the +Z direction. As shown in FIG. 7, the second member 32 has a cylindrical portion 131 having a cylindrical shape and a flange portion 132 provided on the +Z side of the cylindrical portion 131. A screw groove (first screw groove) 135 is formed on the outer circumferential surface of the cylindrical portion 131. On the other hand, the camera 10 has a camera body 110 having a substantially rectangular prism shape and a cylindrical portion 111 provided on the +Z side of the camera body 110. A screw groove (second screw groove) 112 is formed on the inner circumferential surface of the cylindrical portion 111 as shown in FIG.

[0028] When mounting the camera 10 on the mount adaptor 30, first, the second member 32 of the mount adaptor 30 is mounted on the cylindrical portion 111 of the camera 10. At this time, the screw groove 135 of the cylindrical portion 131 of the second member 32 and the screw groove 112 of the cylindrical portion 111 of the camera 10 are fastened to each other, thereby mounting the second member 32 to the camera 10. Note that the end face 113 on the +Z side of the camera 10 shown in FIG. 8 is the mount surface 113 of the camera 10. Therefore, the surface on the -Z side of the flange portion 132 of the second member 32 shown in FIG. 7 is the second mount surface M2 that faces the mount surface 113 of the camera 10 when the camera 10 is mounted.

[0029] The camera 10 with the second member 32 attached thereto is inserted into the first member 31 through the opening 150 of the rear cover 50 and the opening 152 of the printed circuit board 52, as shown by the arrow B in FIG.

[0030] Fig. 9 is a cross-sectional view showing a state in which the camera 10 to which the second member 32 is attached is inserted into the first member 31. As shown in Fig. 9, with the camera 10 to which the second member 32 is attached inserted into the first member 31, the screw 39 is screwed into the cylindrical portion 140 of the first member 31 from the outside, thereby completing the attachment of the camera 10 to the mount adapter 30.

[0031] Fig. 10 is a view of the mount adapter 30 with the camera 10 attached, viewed from the +Z direction. Note that the imaging element 114 of the camera 10 is visible approximately in the center of Fig. 10. In the first embodiment, as described above, the notches 144 are formed at equal intervals in the circumferential direction at the end on the -Z side of the cylindrical portion 140. When the camera 10 is attached to the mount adapter 30, as shown in Fig. 10, the corners 210a to 210d of the camera body 110 fit into the notches 144, respectively.

[0032] 9 without contacting the cylindrical portion 140. Furthermore, by providing the cutout portion 144 in the cylindrical portion 140, even if the diameter of the cylindrical portion 140 is reduced, the camera 10 (camera body 110 having a substantially rectangular prism shape) can be inserted up to the position shown in Fig. 9 without contacting the cylindrical portion 140. Furthermore, by being able to reduce the diameter of the cylindrical portion 140, it is possible to prevent the cylindrical portion 140 from contacting (mechanically interfering with) the interchangeable lens 20.

[0033] FIG. 11 is a diagram showing various dimensions of the mount adapter 30. The position indicated by the thick dashed line in FIG. 11 indicates the position of the image sensor surface (imaging surface) IM of the camera 10. In the first embodiment, since the mount adapter 30 has the shape and configuration shown in FIG. 11, the first mount surface M1 facing the mount surface 23a of the interchangeable lens 20 can be positioned closer to the imaging surface IM than the second mount surface M2 facing the mount surface of the camera 10. This makes it possible to make the distance (flange back FB1) between the first mount surface M1 and the imaging surface IM smaller than the distance (flange back FB2) between the second mount surface M2 and the imaging surface IM. In other words, by using the mount adapter 30, it is possible to appropriately set the focal position between the interchangeable lens 20 and the camera 10 having different flange backs.

[0034] 11, the mount adapter 30 can make the inner diameter D1 of the first mount surface M1 larger than the inner diameter D3 or outer diameter D4 of the second mount surface M2. This allows the interchangeable lens 20 and the camera 10 to be attached to the mount adapter 30 without interfering with each other.

[0035] The distance (protrusion amount) L from the first mount surface M1 to the +Z side surface of the cylindrical portion 140 is set within a range in which the cylindrical portion 140 does not come into contact with the lens inside the interchangeable lens 20.

[0036] In the first embodiment, as shown in FIG. 2, the camera 10 is connected to a PC 90 with the interchangeable lens 20 and the camera 10 attached to the mount adapter 30. The mount adapter 30 and the PC 90 are connected using a cable 92, thereby connecting the PC 90 to a lens communication circuit 350 of the mount adapter 30. In this case, the lens communication circuit 350 is connected to the lens control device 22 of the interchangeable lens 20 via a connection terminal 48 (see FIG. 4(a)). In the first embodiment, the PC 90 generates control information for the interchangeable lens 20 based on an image captured by the camera 10 and a user's operation, and transmits the control information to the lens control device 22 via the lens communication circuit 350.

[0037] As described above in detail, according to the mount adapter 30 of the first embodiment, the first mount surface M1 facing the mount surface 23a of the interchangeable lens 20 is positioned closer to the imaging surface IM than the second mount surface M2 facing the mount surface 113 of the camera 10. That is, the distance between the first mount surface M1 and the imaging surface IM (flange back FB1) is made smaller than the distance between the second mount surface M2 and the imaging surface IM (flange back FB2). Therefore, by using the mount adapter 30 of the first embodiment, even if the mounts of the camera 10 and the interchangeable lens 20 are different and the flange back of the camera 10 is larger than that of the interchangeable lens 20, the interchangeable lens 20 and the camera 10 can be appropriately attached. By appropriately attaching the interchangeable lens 20 and the camera 10, the focal position of the interchangeable lens 20 can be aligned with the imaging surface IM of the camera 10.

[0038] Furthermore, according to the first embodiment, the mount adaptor 30 includes a first member 31 having a first mount surface M1 and a second member 32 having a second mount surface M2, and the second member 32 is detachable from the first member 31. This allows the camera 10 to be easily mounted on the mount adaptor 30 by attaching the second member 32 to the first member 31 after the second member 32 is attached to the camera 10. At this time, the second member 32 is fixed to the first member 31 with the screw 39, so that the first member 31 and the second member 32 can be firmly fixed together.

[0039] Furthermore, according to the first embodiment, the interchangeable lens 20 is bayonet-coupled to the mount adapter 30 via the claw attachment portion 43, which makes it easy to attach and detach the interchangeable lens 20.

[0040] Moreover, in the first embodiment, a notch 144 is provided at the -Z end of the cylindrical portion 140. This allows the diameter of the cylindrical portion 140 to be reduced, and prevents the cylindrical portion 140 from coming into contact with the interchangeable lens 20 (mechanical interference).

[0041] Furthermore, in the first embodiment, the mount adapter 30 is provided with a lens communication circuit 350, and instructions to the interchangeable lens 20 from an external device (PC 90) different from the camera 10 are input via a connector (input unit) 58. This allows the PC 90 to control the driving of the interchangeable lens 20.

[0042] Second Embodiment Next, the second embodiment will be described in detail with reference to FIGS.

[0043] 12 is a perspective view showing a mount adapter 30' according to the second embodiment and a camera 10. The mount adapter 30' includes a first member 31' and a second member 32'.

[0044] The first member 31' has a configuration almost similar to that of the first member 31 of the first embodiment, but the shape of the +Z end of the cylindrical portion 140' is different from the shape of the +Z end of the cylindrical portion 140 of the first embodiment.

[0045] The second member 32' has a cylindrical portion 131' having a cylindrical shape, and a flange portion 132' provided on the +Z side of the cylindrical portion 131'. A screw groove (not shown) is formed on the outer circumferential surface of the cylindrical portion 131'.

[0046] In the second embodiment, when mounting the camera 10 to the mount adaptor 30', the camera 10 is moved in the direction of the arrow D (+Z direction) and the +Z side portion of the camera 10 is inserted into the first member 31'. Then, the second member 32' is moved in the direction of the arrow C (-Z direction) and the second member 32' is mounted to the camera 10 with a part of the first member 31' interposed therebetween. This results in the camera 10 being mounted to the mount adaptor 30'. At this time, the screw groove formed in the cylindrical portion 131' of the second member 32 and the screw groove 112 formed on the inner circumferential surface of the cylindrical portion 111 of the camera 10 are fastened to each other, thereby fixing the second member 32' to the camera 10. When attaching the second member 32' to the camera 10, the second member 32' is rotated around the Z axis. When rotating the second member 32', a tool is engaged with multiple (four in FIG. 12) grooves 137 provided on the outer edge of the flange portion 132' of the second member 32' to rotate the second member 32'.

[0047] Fig. 13 is a cross-sectional view showing a state in which the camera 10 is mounted on the mount adaptor 30'. As shown in Fig. 13, unlike the first embodiment, a circular ring-shaped protrusion 340 that protrudes toward the inner circumferential surface is provided at the +Z end of the cylindrical portion 140' of the first member 31'. Then, the second member 32' is mounted on the camera 10 with this protrusion 340 interposed therebetween. In this case, the surface of the first member 31' facing the mount surface 113 of the camera 10 becomes the second mount surface M2.

[0048] The other configurations are similar to those of the first embodiment.

[0049] FIG. 14 is a diagram showing various dimensions of the mount adapter 30'. The position indicated by the thick dashed line in FIG. 14 indicates the position of the imaging surface IM of the camera 10. In the second embodiment, the mount adapter 30' has a configuration as shown in FIG. 14, so that the first mount surface M1 facing the mount surface of the interchangeable lens 20 is positioned closer to the imaging surface IM than the second mount surface M2 facing the mount surface of the camera 10. This makes it possible to make the distance between the first mount surface M1 and the imaging surface IM (flange back FB1) smaller than the distance between the second mount surface M2 and the imaging surface IM (flange back FB2). In other words, by using the mount adapter 30', it is possible to appropriately set the focal position between the interchangeable lens 20 and the camera 10 having different flange backs.

[0050] 14, the mount adapter 30' can make the inner diameter D1 of the first mount surface M1 larger than the inner diameter D3 or outer diameter D4 of the second mount surface M2. This makes it possible to attach the interchangeable lens 20 and the camera 10 to the mount adapter 30' without mechanically interfering with each other.

[0051] The distance (protrusion amount) L from the first mount surface M1 to the +Z side surface of the second member 32' is set within a range in which the second member 32' does not come into contact with the lenses in the interchangeable lens 20.

[0052] As described above, according to the mount adapter 30' of the second embodiment, as in the first embodiment, the first mount surface M1 facing the mount surface of the interchangeable lens 20 is positioned closer to the imaging surface IM than the second mount surface M2 facing the mount surface of the camera 10. That is, the distance between the first mount surface M1 and the imaging surface IM (flange back FB1) can be made smaller than the distance between the second mount surface M2 and the imaging surface IM (flange back FB2). Therefore, by using the mount adapter 30' of the second embodiment, even if the mounts of the camera 10 and the interchangeable lens 20 are different and the flange back of the camera 10 is larger than that of the interchangeable lens 20, the interchangeable lens 20 and the camera 10 can be appropriately attached. By appropriately attaching the interchangeable lens 20 and the camera 10, the focal position of the interchangeable lens 20 can be aligned with the imaging surface IM of the camera 10.

[0053] In the second embodiment, the first member 31' and the second member 32' are fixed together by mounting the camera 10 to the second member 32' with a part of the first member 31' (protruding portion 340) sandwiched between the second member 32' and the camera 10. By employing such a configuration, the camera 10 can be easily mounted to the mount adapter 30'.

[0054] In the second embodiment, the second member 32' has a thread groove that is fastened to the thread groove 112 provided in the camera 10, and the camera 10 is attached to the second member 32' by fastening the thread grooves together. By employing such a configuration, the camera 10 can be easily attached to the mount adapter 30'.

[0055] In the above first and second embodiments, the flange back of the camera 10 is 17.526 mm, and the flange back of the interchangeable lens 20 is 16 mm, but the present invention is not limited to this. If the flange back of the camera 10 is longer than the flange back of the interchangeable lens 20, it is possible to use a mount adapter 30, 30' having a configuration similar to that of the above first and second embodiments. However, it is necessary to adjust the dimensions of each part of the mount adapter 30, 30' according to the length of the flange back of the camera 10 and the interchangeable lens 20.

[0056] The above-described embodiment is a preferred example, but is not limited thereto, and various modifications are possible without departing from the scope of the present invention, and any combination of components may be used. [Explanation of symbols]

[0057] 10. Camera 20 Interchangeable Lenses 30, 30' Mount Adapter 31,31' First member 32,32' Second member 39 Screws 43 Claw attachment part 58 Connector 90 PC 112 Thread groove 135 Thread groove 140,140' Cylindrical section 144 Cutout M1 1st mount surface M2 2nd mounting surface

Claims

1. A mount adapter disposed between an interchangeable lens and an imaging device, a first mount surface that faces a mount surface of the interchangeable lens when the interchangeable lens is attached; a second mount surface that faces the mount surface of the imaging device when the imaging device is attached; a mount adapter in which, when the interchangeable lens and the imaging device are attached, the first mount surface is located closer to an imaging surface of the imaging device than the second mount surface.

2. the first mount surface and the second mount surface have a substantially annular shape, an inner diameter of the first mounting surface is greater than an outer diameter of the second mounting surface; The mount adapter according to claim 1 .

3. a first member having the first mounting surface; a second member having the second mounting surface; The mount adaptor according to claim 1 , wherein the second member is detachable from the first member.

4. The imaging device is attached to the second member, The interchangeable lens and the second member to which the imaging device is attached are attached to the first member. The mount adapter according to claim 3 .

5. the first member has a cylindrical portion; With the second member having the imaging device attached thereto disposed inside the cylindrical portion, the second member is fixed to the cylindrical portion from the outside with a fixing screw. The mount adapter according to claim 4 .

6. a first member having the first mounting surface and the second mounting surface; a second member different from the first member, The imaging device is attached to the second member in a state in which a part of the first member is sandwiched between the second member and the imaging device, thereby fixing the first member and the second member. The mount adapter according to claim 1 or 2.

7. the second member has a second screw groove that is fastened to a first screw groove provided in the imaging device, The mount adaptor according to claim 6 , wherein the imaging device is attached to the second member by fastening the first screw groove and the second screw groove.

8. A claw attachment portion that engages with a mount claw of the interchangeable lens, The mount adapter according to claim 1 , wherein the interchangeable lens is attached by engaging the mount claws with the claw attachment portions.

9. a cylindrical portion that protrudes toward the interchangeable lens beyond the first mount surface when the interchangeable lens and the imaging device are attached to the interchangeable lens; a portion of the cylindrical portion being the second mounting surface; The mount adapter according to claim 1 or 2.

10. The cylindrical portion has a plurality of cutouts arranged approximately uniformly in a circumferential direction. The mount adapter according to claim 9 .

11. an input unit for inputting an instruction to the interchangeable lens from an external device different from the imaging device; A mount adaptor according to any one of claims 1 to 10.

12. A mount adapter disposed between an interchangeable lens and an imaging device, a first mount surface that faces a mount surface of the interchangeable lens when the interchangeable lens is attached; a second mount surface that faces the mount surface of the imaging device when the imaging device is attached; A mount adapter in which, when the interchangeable lens and the imaging device are attached, the length from the first mount surface to an imaging surface of the imaging device is shorter than the length from the second mount surface to the imaging surface.

Images