Imaging systems, imaging devices, and accessories

Abstract

A simple configuration restricts the movement of accessories relative to the imaging device. [Solution] An imaging system 100 comprising an imaging device 110, an accessory 120 that can be attached to and detached in the direction of the optical axis of the imaging device 110 by rotating the imaging device 110 around the optical axis, and a fixing member 180 fixed to the imaging device 110, wherein the accessory 120 has a flange portion 125 that protrudes radially outward from the annular outer peripheral side surface of the accessory, and the fixing member 180 has a restricting portion that, when the accessory 120 is attached to the imaging device 110 and fixed to the imaging device 110, abuts against the flange portion 125 and restricts the movement of the accessory 120 in the direction of the optical axis and rotation around the optical axis.

Description

Technical Field

[0001] The present invention relates to an imaging system including an accessory and an imaging apparatus.

Background Art

[0002] In interchangeable-lens imaging apparatuses, a bayonet coupling system is widely used for attachment and detachment structures of accessories such as interchangeable lenses with respect to a lens mount provided on the front surface of the imaging apparatus. In the bayonet coupling system, a camera mount of an accessory and a lens mount of an imaging apparatus are abutted at a predetermined position and rotated, so that claw portions of the camera mount and claw portions of the lens mount are engaged with each other. At this time, the claw portions of the lens mount bias the claw portions of the camera mount toward the interior of the imaging apparatus by the force of a spring provided inside the imaging apparatus, whereby the accessory is coupled to the imaging apparatus.

[0003] The bayonet coupling system has an advantage that the accessory can be easily attached to and detached from the imaging apparatus. However, if a force larger than the force biasing the claw portions of the camera mount acts on the accessory, the accessory moves relative to the imaging apparatus, which may cause the optical axes of the accessory and the imaging apparatus to be misaligned and degrade optical performance. To address such a problem, for example, Patent Document 1 discloses a configuration that suppresses displacement of the accessory relative to the imaging apparatus in the optical axis direction by using a fixing member that presses the accessory mounted on the imaging apparatus against the imaging apparatus in the optical axis direction.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0005] However, the technology described in the above patent document does not take into account the displacement of the accessory with the imaging optical axis as the axis of rotation, i.e., the rotation of the accessory. Therefore, for example, if a mount adapter is attached to a lens mount, and a large interchangeable lens is then attached to the mount adapter, there is a risk that the mount adapter may rotate around the optical axis relative to the imaging device due to the external force acting on the interchangeable lens.

[0006] The present invention aims to provide a technology that enables the displacement of an accessory relative to an imaging device in an imaging system in which an accessory is attached to the imaging device, using a simple configuration. [Means for solving the problem]

[0007] The imaging system according to the present invention comprises an imaging device having a first mount, an accessory having a second mount that can be attached to and detached from the first mount in the optical axis direction of the imaging device by rotational operation of the imaging device around the optical axis, and a fixing member fixed to the imaging device, wherein the accessory has a flange portion that protrudes radially outward from the annular outer peripheral side surface of the accessory, and the fixing member has a restricting portion that, when the accessory is attached to the imaging device and fixed to the imaging device, abuts against the flange portion to restrict the displacement of the accessory in the optical axis direction and restricts rotation around the optical axis. [Effects of the Invention]

[0008] According to the present invention, in an imaging system in which an accessory is attached to an imaging device, it is possible to restrict the displacement of the accessory relative to the imaging device with a simple configuration. [Brief explanation of the drawing]

[0009] [Figure 1] These are exploded perspective views and external perspective views of the imaging system according to the embodiment. [Figure 2] This is a perspective view of the accessory. [Figure 3] These are perspective views of some of the accessories and perspective views of the fixing components. [Figure 4] This is a front view of the imaging system and a cross-sectional view taken along arrow AA in the front view. [Figure 5] This is a perspective view of a portion of the front of the imaging device and a perspective view of the fixing member. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1(a) is an exploded perspective view of the imaging system 100 according to an embodiment, and Figure 1(b) is an external perspective view of the imaging system 100. The imaging system 100 includes an imaging device 110, an accessory 120, and a fixing member 180. Here, a mount adapter will be given as a specific example of the accessory 120.

[0011] Furthermore, the orthogonal coordinate system shown in Figure 1 is set for the imaging system 100. The Z-axis is the imaging optical axis L of the imaging device 110, and is the axis representing the front-to-back direction of the imaging device 110, with the direction from the back side to the front side of the imaging device 110 being defined as the positive direction. The Y-axis is the axis representing the up-and-down direction of the imaging device 110, with the direction from the bottom side to the top side being defined as the positive direction. The X-axis is the axis representing the left-to-right direction of the imaging device 110, with the direction from the left side to the right side being defined as the positive direction when viewing the imaging device 110 from the front side.

[0012] The front of the imaging device 110 is provided with a first mount 112 (lens mount) that allows the attachment and detachment of various interchangeable lenses and accessories such as mount adapters with different optical performance using a bayonet coupling method. Inside the first mount 112 is a first contact section 115 composed of multiple terminals. Inside the imaging device 110 are an image sensor 111 that converts an optical image into an image signal, and a control board (not shown) on which a microcomputer and other components that perform overall control of the imaging system 100 are mounted. The image sensor 111 is positioned so that the imaging surface on which the optical image is formed is perpendicular to the imaging optical axis L. Although not shown, all interchangeable lenses directly attached to the first mount 112 form an optical image on the imaging surface of the image sensor 111.

[0013] The accessory 120 has a roughly annular shape, a second mount 121 on its back, and a third mount on its front. The second mount 121 is configured to be detachable from the first mount 112 by a rotational operation of the imaging device 110 relative to the first mount 112, with the optical axis direction being the attachment / detachment direction. The third mount 122 is configured to allow attachment and detachment of interchangeable lenses and the like that cannot be directly attached to the first mount 112. The accessory 120 is configured so that an interchangeable lens attached to the third mount 122 can form an optical image on the imaging surface of the image sensor 111.

[0014] The accessory 120 is provided with a substantially arc-shaped flange portion 125 that protrudes radially outward from the annular outer peripheral side surface. When the accessory 120 is viewed from the front, there are a total of four flange portions 125, two on the left side (-X side) and two on the right side (+X side) of the imaging optical axis L.

[0015] The fixing member 180 has a substantially arc shape that is curved to match the annular side surface of the accessory 120. When one fixing member 180 is fixed to the imaging device 110, it simultaneously covers two flange portions 125 on the +X side of the accessory 120. Similarly, another fixing member 180 is fixed to the imaging device 110 so as to cover two flange portions 125 on the -X side of the accessory 120.

[0016] Each of the two fixing members 180 is secured by screwing a fixing screw 182 into a screw hole 119 formed in a recess 118 provided on the front surface of the imaging device 110. The fixing of the fixing members 180 to the imaging device 110 restricts the displacement of the accessory 120 in the Z direction (optical axis direction) and also restricts its rotation around the optical axis (displacement in the rotational direction with the imaging optical axis L as the rotational center axis). Details of this will be described later.

[0017] Figure 2 is an external perspective view of accessory 120. Figure 2(a) is a perspective view from the front, and Figure 2(b) is a perspective view from the rear. Inside the second mount 121, which is provided on the rear side of accessory 120, is a second contact portion 126 that electrically connects to the first contact portion 115 of the imaging device 110 when accessory 120 is attached to the imaging device 110. Inside the third mount 122, which is provided on the front side of accessory 120, is a third contact portion 127 that electrically connects to the electrical contacts of an interchangeable lens (not shown).

[0018] Inside the accessory 120, the second contact portion 126 and the third contact portion 127 are electrically connected by connecting components (not shown), such as a circuit board and wires. Therefore, when an interchangeable lens is attached to the imaging device 110 via the accessory 120, the interchangeable lens and the imaging device 110 can communicate through the first contact portion 115, the second contact portion 126, and the third contact portion 127. In this way, the imaging device 110 can acquire information from the interchangeable lens, such as the shooting angle of view and aperture value.

[0019] Next, displacement restriction of the accessory 120 by the fixing member 180 will be described. Figure 3(a) is an enlarged perspective view showing the flange portion 125 of the accessory 120. Figure 3(b) is a perspective view of the fixing member 180.

[0020] The two flange portions 125 shown in Figure 3(a) are formed in a symmetrical shape at positions symmetrical with respect to the ZX plane (the plane orthogonal to the Y axis (first plane)) including the imaging optical axis L. The front surface of the flange portion 125 is a flange contact surface 125a (first contact surface) that abuts against the fixing member 180 fastened to the imaging apparatus 110 in the optical axis direction. Further, one end of the flange portion 125 in the length direction (the circumferential direction of the annular outer periphery of the accessory 120) is a flange inclined surface 125b (second contact surface) that abuts against the fixing member 180, and the flange inclined surfaces 125b face each other across the ZX plane including the imaging optical axis L. Note that in the accessory 120, the flange portions 125 are formed as one set of the two shown in Figure 3(a), at positions symmetrical with respect to the YZ plane (the plane orthogonal to the X axis (second plane)) including the imaging optical axis L, that is, two sets in total.

[0021] The flange inclined surface 125b is formed as a plane that forms a predetermined angle with the ZX plane (the plane orthogonal to the flange contact surface 125a) from the end of the flange contact surface 125a (the boundary with the flange contact surface 125a) toward the -Z side. Specifically, the distance between the intersections of the outer periphery of the accessory 120, the front surface of the flange portion 125, and the flange inclined surface 125b is defined as 'D2', and the distance between the intersections of the outer periphery of the accessory 120, the back surface of the flange portion 125, and the flange inclined surface 125b is defined as 'D1'. In this case, the flange inclined surface 125b is formed such that the relationship D2>D1 holds. Therefore, when the accessory 120 is viewed from the front side (+Z side), the flange inclined surface 125b can be visually recognized. On the other hand, when the accessory 120 is viewed from the back side (-Z side), the flange inclined surface 125b is hidden by the back surface of the flange portion 125, so the flange inclined surface 125b cannot be visually recognized.

[0022] There is one fixing member 180 that abuts against a pair of flange portions 125 shown in Figure 3(a). The fixing member 180 has a fixing member contact surface 180a (third contact surface) and a fixing member inclined surface 180b (fourth contact surface) formed thereon as restricting parts for restricting the displacement (movement) of the accessory 120 attached to the imaging device 110. When the fixing member 180 is fixed to the imaging device 110, the fixing member contact surface 180a and the fixing member inclined surface 180b abut against the flange contact surface 125a and the flange inclined surface 125b of the flange portion 125 of the accessory 120, respectively.

[0023] The fixed member inclined surface 180b is formed as a plane that makes a predetermined angle with the ZX plane, extending from the end of the fixed member contact surface 180a (the boundary with the fixed member contact surface 180a) toward the -Z side. Specifically, the -Z side surface connecting the two fixed member inclined surfaces 180b is conveniently defined as the inclined connection surface 180c. On the inner diameter side of the fixed member 180, the distance between the intersections of the fixed member contact surface 180a and the fixed member inclined surface 180b is 'd2', and the distance between the intersections of the inclined connection surface 180c and the fixed member inclined surface 180b is 'd1'. In this case, the fixed member inclined surface 180b is formed such that the relationship d2 > d1 holds.

[0024] Figure 4(a) is a front view of the imaging system 100, that is, a front view showing the imaging device 110 with the accessory 120 attached and the fixing member 180 fixed in place. Figure 4(b) is a cross-sectional view taken along the line AA shown in Figure 4(a).

[0025] When the fixing member 180 is fixed to the imaging device 110, the fixing member contact surface 180a of the fixing member 180 contacts the flange contact surface 125a of the flange portion 125, pressing the flange portion 125 toward the rear side of the imaging device 110 in the optical axis direction, i.e., in the -Z direction. This restricts the displacement of the accessory 120 in the optical axis direction.

[0026] At the same time, the rotation of the accessory 120 around the optical axis is restricted when the inclined surface 180b of the fixing member 180 comes into contact with the inclined surface 125b of the flange portion 125. In other words, the rotation of the accessory 120 around the optical axis is restricted when the fitting portion formed by the fixing member contact surface 180a and the fixing member inclined surface 180b fits into the fitted portion formed by the flange contact surface 125a and the inclined surface 125b.

[0027] Ideally, d2 ≈ D2 is desirable for the flange contact surface 125a and the fixing member contact surface 180a, and the flange inclined surface 125b and the fixing member inclined surface 180b to contact each other while suppressing play. In Figure 4(b), d1 > D1, but a larger contact surface area between the flange inclined surface 125b and the fixing member inclined surface 180b is preferable for suppressing play. That is, in the X direction of Figure 4(b), d1 ≤ D1 may be set so that the position of the end of the fixing member inclined surface 180b coincides with the position of the end of the flange inclined surface 125b, or the position of the end of the fixing member inclined surface 180b protrudes more than the position of the end of the flange inclined surface 125b. As a result, the convex shape on the -Z side, which is formed by the two fixing member inclined surfaces 180b and the inclined connection surface 180c, fits snugly into the space between the two flange inclined surfaces 125b, thereby more reliably restricting the rotation of the accessory 120 around the optical axis.

[0028] As described above, the imaging system 100 has a simple configuration in which the fixing member 180 is fixed to the imaging device 110, and it is possible to simultaneously restrict the displacement of the accessory 120 in the optical axis direction and its rotation around the optical axis.

[0029] Next, the manner in which the fixing member 180 is fixed to the imaging device 110 will be described. Figure 5(a) is a partially enlarged perspective view of the front of the imaging device 110. Figure 5(b) is a perspective view of the fixing member 180.

[0030] In the imaging device 110, the recess 118 is formed to recess in the -Z direction, which is the fixing direction of the fixing member 180, from the front outer surface, and a screw hole 119 is formed approximately in the center of the recess contact surface 118a, which is the bottom surface of the recess 118. The recess 118 also has a recess inclined surface 118b that extends continuously in the +Z direction from the end of the recess contact surface 118a and widens outward (the opening surface of the recess 118 is larger than the recess contact surface 118a).

[0031] A projection 181 projecting in the -Z direction is formed on the back side of the longitudinal end of the fixing member 180, in a shape that fits into the recess 118. A through hole 187 is formed in the approximate center of the projection 181 for inserting a fixing screw 182. The projection 181 has a projection contact surface 181a, which is the tip surface (-Z side plane), and a projection inclined surface 181b that extends continuously from the projection contact surface 181a in the +Z direction (towards the lower end of the projection 181) and is inclined to spread outwards.

[0032] Note that the recessed inclined surface 118b and the convex inclined surface 181b do not need to be formed around the entire circumference. In this embodiment, the wall surface of the recess 118 on the first mount 112 side is formed as a curved surface parallel to the imaging optical axis L, and the other wall surfaces are formed as inclined surfaces. Similarly, the wall surface of the convex portion 181 of the fixing member 180 that faces the first mount 112 when fixed to the imaging device 110 is also formed as a curved surface parallel to the imaging optical axis L, and the other wall surfaces are formed as inclined surfaces.

[0033] When the fixing member 180 is fixed to the imaging device 110, the concave and convex shapes of the recess 118 and the convex 181 fit together. At this time, the contact surface of the recess 118a and the contact surface of the convex 181a come into contact, restricting the displacement of the fixing member 180 in the optical axis direction. Furthermore, the inclined surface of the recess 118b and the inclined surface of the convex 181b are formed so that their respective inclined surfaces face each other in the circumferential direction. In other words, the inclined surface of the recess 118b and the inclined surface of the convex 181b are formed so that they face each other in the rotational direction around the optical axis. Therefore, the contact between the inclined surface of the recess 118b and the inclined surface of the convex 181b restricts the rotation of the fixing member 180 around the optical axis.

[0034] Furthermore, by providing a recessed inclined surface 118b in the recessed area 118 of the imaging device 110, and a convex inclined surface 181b in the convex area 181 of the fixing member 180, the fixing member 180 can be easily attached to and detached from the imaging device 110.

[0035] As described above, in the imaging system according to this embodiment, the accessory 120 is attached to the imaging device 110, and the fixing member 180 is fitted to the accessory 120 and the imaging device 110 to fix it to the imaging device 110. Therefore, it is possible to simultaneously restrict the displacement of the fixing member 180 and the accessory 120 in the optical axis direction relative to the imaging device 110, as well as the rotation around the optical axis.

[0036] Although the present invention has been described in detail above based on its preferred embodiments, the present invention is not limited to these specific embodiments, and various forms that do not depart from the spirit of the invention are also included in the present invention. For example, in the above embodiment, a mount adapter was taken as the accessory 120 having a flange portion 125. However, it is not limited to this, and the accessory 120 may be an interchangeable lens. By providing the interchangeable lens with a flange portion 125 and further fixing the interchangeable lens to the imaging device 110 with a fixing member 180, the displacement of the interchangeable lens in the optical axis direction and the rotation around the optical axis can be restricted simultaneously.

[0037] Furthermore, the accessory 120 is shown with two flange portions 125 that engage with a single fixing member 180. However, the design is not limited to this configuration; the two flange portions may be joined together to form a single flange, with both end faces in the longitudinal direction being inclined surfaces. In this case, the circumferential length of the front of one flange portion is shorter than the circumferential length of the back, and the inclined surface of the fixing member is formed to contact the inclined surface of the flange.

[0038] This embodiment includes the following configuration. (Configuration 1) An imaging system comprising: an imaging device having a first mount; an accessory having a second mount that can be attached to and detached from the first mount in the optical axis direction of the imaging device by rotational operation of the imaging device around the optical axis; and a fixing member fixed to the imaging device, wherein the accessory has a flange portion that protrudes radially outward from the annular outer peripheral side surface of the accessory, and the fixing member has a restricting portion that, when the accessory is mounted on the imaging device and fixed to the imaging device, abuts against the flange portion to restrict the displacement of the accessory in the optical axis direction and restricts rotation around the optical axis. (Configuration 2) The imaging system according to Configuration 1, characterized in that the flange portion has a substantially arc shape along the circumferential direction of the annular outer peripheral side surface, and has a first contact surface which is the front surface perpendicular to the imaging optical axis of the imaging device when the accessory is mounted on the imaging device, and a second contact surface which is the end face in the longitudinal direction of the flange portion, and the restricting portion has a third contact surface which contacts the first contact surface to restrict the displacement of the accessory in the optical axis direction, and a fourth contact surface which contacts the second contact surface to restrict the rotation of the accessory about the optical axis. (Configuration 3) The imaging system according to Configuration 2, characterized in that the second contact surface is an inclined surface that makes a predetermined angle with a plane perpendicular to the first contact surface, the second contact surface can be seen when the accessory is viewed from the front, and the second contact surface cannot be seen when the accessory is viewed from the rear. (Configuration 4) The imaging system according to Configuration 3, characterized in that the second contact surface is formed at both ends in the longitudinal direction of the flange portion. (Configuration 5) The imaging system according to Configuration 3, characterized in that the flange portions are formed in pairs in symmetrical shapes at positions symmetrical with respect to a first plane including the imaging optical axis, and the second contact surfaces face each other across the first plane, and one fixing member is fixed to the imaging device with respect to the pair of flange portions. (Configuration 6) The imaging system according to Configuration 5, characterized in that the accessory has one set of flange portions provided at two locations that are symmetrical with respect to a second plane including the imaging optical axis, and the second plane is perpendicular to the first plane. (Configuration 7) The imaging system according to any one of Configurations 1 to 6, characterized in that the imaging device has a recess to which the fixing member is fixed, the fixing member has a protrusion that fits into the recess, a screw hole is formed on the bottom surface of the recess, and a through hole is formed in the protrusion, and the fixing member is fixed to the imaging device by screwing a screw through the through hole into the screw hole while the protrusion is fitted into the recess. (Configuration 8) The imaging system according to Configuration 7, characterized in that the recess has a recess contact surface which is the bottom surface of the recess, and a recess inclined surface which is continuously inclined from the end of the recess contact surface such that the opening surface of the recess is larger than the recess contact surface, and the protrusion has a protrusion contact surface which is the tip surface of the protrusion, and a protrusion inclined surface which is inclined to continuously spread outward from the protrusion contact surface toward the lower end of the protrusion, and when the protrusion is fitted into the recess, the recess contact surface and the protrusion contact surface are in contact, and the recess inclined surface and the protrusion inclined surface are in contact. (Configuration 9) The imaging system according to Configuration 8, characterized in that the concave inclined surface and the convex inclined surface are each formed to face each other in at least the rotational direction around the optical axis. (Configuration 10) The imaging system according to any one of Configurations 1 to 9, characterized in that the first mount is a lens mount and the accessory is a mount adapter or an interchangeable lens. (Configuration 11) An imaging system comprising an imaging device, an accessory detachable from the imaging device, and a fixing member fixed to the imaging device and restricting the displacement of the accessory, wherein the imaging device has a recess that is recessed in the fixing direction of the fixing member, the fixing member has a protrusion that fits into the recess, and the fitting of the protrusion and the recess simultaneously restricts the displacement of the fixing member in the fixing direction and the displacement in the rotational direction with an axis parallel to the fixing direction as the rotational axis. (Configuration 12) The imaging system according to Configuration 11, characterized in that the recess has a recess contact surface which is the bottom surface of the recess, and a recess inclined surface which is continuously inclined from the end of the recess contact surface such that the opening surface of the recess is larger than the recess contact surface, and the protrusion has a protrusion contact surface which is the tip surface of the protrusion, and a protrusion inclined surface which is inclined to continuously spread outward from the protrusion contact surface toward the lower end of the protrusion, and when the protrusion is fitted into the recess, the recess contact surface and the protrusion contact surface are in contact, and the recess inclined surface and the protrusion inclined surface are in contact. (Configuration 13) The imaging system according to Configuration 12, characterized in that the recessed inclined surface and the convex inclined surface are each formed to face each other at least in the rotational direction. (Configuration 14) The imaging system according to any one of Configurations 11 to 13, characterized in that the fixing direction is the optical axis direction. (Configuration 15) An imaging system comprising an imaging device, an accessory detachable from the imaging device, and a fixing member fixed to the imaging device, wherein the accessory has a fitting portion, and the fixing member has a fitting portion that fits with the fitting portion when the accessory is mounted on the imaging device and the fixing member is fixed to the imaging device, restricting the displacement of the accessory in the attachment / detachment direction relative to the imaging device, and restricting the rotation of the accessory with an axis parallel to the attachment / detachment direction as the rotational axis. (Configuration 16) An imaging device capable of mounting a fixing member to restrict the displacement of an accessory that is detachable in the optical axis direction, the device having a recess in the optical axis direction to which the fixing member is fixed, the recess having an inclined surface that is continuously inclined from the end of the bottom surface such that the opening surface of the recess is larger than the bottom surface of the recess, and the inclined surface is formed to face each other at least in the rotational direction with the imaging optical axis of the imaging device as the rotational axis. (Configuration 17) An annular accessory that can be attached to and detached from an imaging device by rotational operation of the imaging device around the optical axis, wherein the accessory has a substantially arc shape that protrudes radially outward from the outer peripheral surface of the annular shape and is along the circumferential direction of the outer peripheral surface, and the front surface has a flange portion perpendicular to the central axis of the accessory, the flange portion is formed in pairs in a symmetrical shape at positions symmetrical with respect to a first plane including the central axis, the end faces facing each other across the first plane are inclined surfaces that make a predetermined angle with respect to the first plane so that they can be seen from the front side of the accessory but not from the back side, and the pair of flange portions are provided at two locations symmetrical with respect to a second plane that includes the central axis and is perpendicular to the first plane. (Configuration 18) A fixing member that is fixed to an imaging device and restricts the displacement of an accessory attached to the imaging device relative to the imaging device, the fixing member having a contact surface that contacts the accessory when fixed to the imaging device, wherein the contact surface has a plane that is perpendicular to the fixing direction of the fixing member relative to the imaging device when the fixing member is attached to the imaging device and restricts the displacement of the accessory in the fixing direction, and an inclined surface that forms a predetermined angle with the plane and restricts the displacement of the accessory in a rotational direction with an axis parallel to the fixing direction as the rotational axis. [Explanation of Symbols]

[0039] 100 Imaging Systems 110 Imaging device 118 recess 118a Recessed contact surface 118b Recessed inclined surface 120 Accessories 125 Flange section 125a Flange contact surface 125b Flange inclined surface 180 Fixing member 180a Contact surface of fixing member 180b Inclined surface of fixing member 181 Convex part 181a Convex contact surface 181b Convex inclined surface

Claims

1. An imaging device having a first mount, An accessory having a second mount that can be attached to and detached from the first mount in the direction of the optical axis of the imaging device by rotational operation of the imaging device around the optical axis of the imaging device, An imaging system comprising a fixing member fixed to the imaging device, The accessory has a flange portion that protrudes radially outward from the annular outer peripheral surface of the accessory, The imaging system is characterized in that the fixing member has a restricting portion that, when the accessory is attached to the imaging device and fixed to the imaging device, contacts the flange portion to restrict the displacement of the accessory in the optical axis direction and restricts its rotation around the optical axis.

2. The flange portion has a substantially arc shape along the circumferential direction of the annular outer peripheral surface, and includes a first contact surface which is the front surface perpendicular to the imaging optical axis of the imaging device when the accessory is attached to the imaging device, and a second contact surface which is the end face in the longitudinal direction of the flange portion. The aforementioned regulatory body, A third contact surface that contacts the first contact surface and restricts the displacement of the accessory in the optical axis direction, The imaging system according to claim 1, further comprising a fourth contact surface that contacts the second contact surface to restrict the rotation of the accessory around the optical axis.

3. The imaging system according to claim 2, characterized in that the second contact surface is an inclined surface that makes a predetermined angle with a plane perpendicular to the first contact surface, the second contact surface can be seen when the accessory is viewed from the front, and the second contact surface cannot be seen when the accessory is viewed from the back.

4. The imaging system according to claim 3, characterized in that the second contact surface is formed at both ends in the longitudinal direction of the flange portion.

5. The flange portion is formed in pairs with a symmetrical shape at positions symmetrical with respect to the first plane containing the imaging optical axis, and the second contact surface faces the first plane. The imaging system according to claim 3, characterized in that one of the fixing members is fixed to the imaging device with respect to the set of flange portions.

6. The imaging system according to claim 5, characterized in that the accessory has a pair of flange portions provided at two locations that are symmetrical with respect to a second plane including the imaging optical axis, and the second plane is perpendicular to the first plane.

7. The imaging device has a recess to which the fixing member is fixed, The fixing member has a protrusion that fits into the recess, A screw hole is formed in the bottom surface of the recess, and a through hole is formed in the protrusion. The imaging system according to any one of claims 1 to 6, characterized in that the fixing member is fixed to the imaging device by screwing a screw through the through hole into the screw hole while the protrusion is fitted into the recess.

8. The aforementioned recess is The recess contact surface, which is the bottom surface of the recess, The recess has an inclined recess surface that is continuously inclined from the end of the recess contact surface such that the opening surface of the recess is larger than the recess contact surface, The aforementioned protrusion is, The tip surface of the protrusion is the protrusion contact surface, It has a convex inclined surface that is inclined to continuously extend outward from the convex contact surface toward the lower end of the convex, The imaging system according to claim 7, characterized in that, with the convex portion fitted into the concave portion, the concave portion contact surface and the convex portion contact surface are in contact, and the concave portion inclined surface and the convex portion inclined surface are in contact.

9. The imaging system according to claim 8, characterized in that the recessed inclined surface and the convex inclined surface are each formed to face each other at least in the rotational direction around the optical axis.

10. The first mount is a lens mount, The imaging system according to any one of claims 1 to 5, characterized in that the accessory is a mount adapter or an interchangeable lens.

11. Imaging device and Accessories that can be attached to and detached from the imaging device, An imaging system comprising a fixing member fixed to the imaging device and restricting the displacement of the accessory, The imaging device has a recess that is recessed in the direction of fixing the fixing member, The fixing member has a protrusion that fits into the recess, An imaging system characterized in that the fitting of the convex portion and the concave portion simultaneously restricts the displacement of the fixing member in the fixing direction and the displacement in the rotational direction with an axis parallel to the fixing direction as the rotational axis.

12. The aforementioned recess is The recess contact surface, which is the bottom surface of the recess, The recess has an inclined recess surface that is continuously inclined from the end of the recess contact surface such that the opening surface of the recess is larger than the recess contact surface, The aforementioned protrusion is, The tip surface of the protrusion is the protrusion contact surface, It has a convex inclined surface that is inclined to continuously extend outward from the convex contact surface toward the lower end of the convex, The imaging system according to claim 11, characterized in that, with the convex portion fitted into the concave portion, the concave portion contact surface and the convex portion contact surface are in contact, and the concave portion inclined surface and the convex portion inclined surface are in contact.

13. The imaging system according to claim 12, characterized in that the recessed inclined surface and the convex inclined surface are each formed to face each other at least in the rotational direction.

14. The imaging system according to any one of claims 11 to 13, characterized in that the fixing direction is the optical axis direction.

15. Imaging device and The imaging device includes an accessory that can be attached to or detached from it, An imaging system comprising a fixing member fixed to the imaging device, The accessory has a fitting portion, The imaging system is characterized in that the fixing member has a fitting portion which fits with the fitting portion when the accessory is attached to the imaging device and the fixing member is fixed to the imaging device, restricting the displacement of the accessory in the attachment / detachment direction relative to the imaging device, and restricting the rotation of the accessory with an axis parallel to the attachment / detachment direction as the rotational axis.

16. An imaging device capable of mounting a fixing member to restrict the displacement of an accessory that is detachable in the optical axis direction, It has a recess in the direction of the optical axis, and the fixing member is fixed to it, The recess has an inclined surface that slopes continuously from the edge of the bottom surface such that the opening surface of the recess is larger than the bottom surface of the recess. The imaging device is characterized in that the inclined surfaces are formed to face each other in a rotational direction with the imaging optical axis of the imaging device as the rotational axis.

17. An annular accessory that can be attached to and detached from the imaging device by rotating the imaging device around its optical axis, The accessory has a substantially arc shape that protrudes radially outward from the annular outer peripheral surface and is aligned with the circumferential direction of the outer peripheral surface, and its front surface has a flange portion perpendicular to the central axis of the accessory. The flange portion is formed in pairs with a symmetrical shape at positions symmetrical with respect to the first plane including the central axis, The end faces opposite each other across the first plane are inclined surfaces that form a predetermined angle with the first plane, such that they can be seen from the front side of the accessory but cannot be seen from the back side. The accessory is characterized in that the set of flange portions includes the central axis and is provided at two locations that are symmetrical with respect to a second plane perpendicular to the first plane.

18. A fixing member that is fixed to an imaging device and restricts the displacement of an accessory attached to the imaging device relative to the imaging device, It has a contact surface that contacts the accessory when fixed to the imaging device, The aforementioned contact surface is With the fixing member attached to the imaging device, a plane perpendicular to the fixing direction of the fixing member relative to the imaging device and restricting the displacement of the accessory in the fixing direction, A fixing member characterized by having an inclined surface that forms a predetermined angle with the plane and restricts the displacement of the accessory in a rotational direction with an axis parallel to the fixing direction as the rotational axis.

Images