Accessories

Abstract

The present disclosure relates to accessories. An interchangeable lens is detachably attached to a camera body, and the camera body includes a body-side mounting assembly, an image sensor, a body-side terminal, and a first body-side claw to a fourth body-side claw. The interchangeable lens includes a lens-side mounting assembly, a lens-side terminal that contacts the body-side terminal when the interchangeable lens is attached to the camera body, and a first lens-side claw to a fourth body-side claw that cooperate with the first body-side claw to the fourth body-side claw. The first lens-side claw and the third lens-side claw are arranged on a third lens-side straight line, which intersects the third lens-side straight line at approximately 45 degrees on the optical axis. The first lens-side straight line passes through the center between the opposite ends of the first lens-side claw and the optical axis. The second lens-side claw and the fourth lens-side claw are arranged on a fourth lens-side straight line, which is orthogonal to the third lens-side straight line on the optical axis.

Description

[0001] This application is a divisional application of the patent application with application number 201811247650.0 and name “Accessories” filed on October 25, 2018. Technical Field

[0002] The present invention relates to accessories. Background Art

[0003] There are known accessories that can be attached to and detached from a camera body (for example, Patent Document 1). Conventionally, it has been necessary to attach an accessory to a camera body in a state where it can be used appropriately.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 8-43910 Summary of the Invention

[0007] The first embodiment of the invention relates to an accessory that can be loaded and unloaded relative to a camera body, wherein the camera body comprises: a photographing element, which is in a rectangular shape with an upper side, a lower side, a right side, and a left side when the camera body is placed in a horizontal position, and is centered on an optical axis for incident light from a subject; a body-side terminal group, which includes a plurality of body-side terminals arranged above the upper side of the photographing element; a body-side assembly, which is arranged on the outside of the photographing element and the body-side terminal group, and is in a circular ring shape centered on the optical axis; and a plurality of body-side protrusions, which protrude from the body-side assembly toward the inner diameter direction. The plurality of body-side protrusions are respectively arranged in four areas divided by a first body-side straight line and a second body-side straight line, the first body-side straight line passes through the center of the circumferential direction of the body-side terminal group and the optical axis, the second body-side straight line and the first body-side straight line are orthogonal to each other at the optical axis, and the accessory comprises: an accessory-side mounting member, which is annular with the optical axis as the center and contacts the body-side mounting member; a cylindrical portion extending from the inner peripheral edge of the accessory-side mounting member in the direction of the optical axis; an accessory-side terminal group arranged on the inner side of the cylindrical portion, including a portion attached to the camera body a plurality of accessory-side terminals that contact the body-side terminals when the accessory is mounted on the body; a first accessory-side protrusion that protrudes from the cylindrical portion toward the outer circumference of the accessory-side mounting member and extends in a circumferential direction centered on the optical axis; a second accessory-side protrusion that protrudes from the cylindrical portion toward the outer circumference of the accessory-side mounting member and extends in a circumferential direction centered on the optical axis; a third accessory-side protrusion that protrudes from the cylindrical portion toward the outer circumference of the accessory-side mounting member and extends in a circumferential direction centered on the optical axis; and a fourth accessory-side protrusion that protrudes from the cylindrical portion toward the accessory-side mounting member. The accessory protrudes in the circumferential direction and extends in the circumferential direction centered on the optical axis, the first accessory side protrusion and the third accessory side protrusion are arranged on the accessory side third straight line that intersects the accessory side first straight line at approximately 45 degrees at the optical axis, the second accessory side protrusion and the fourth accessory side protrusion are arranged on the accessory side fourth straight line that is orthogonal to the accessory side third straight line at the optical axis, and the accessory side first straight line passes through the center of the terminal arranged at the end of one side of the accessory side terminal group and the terminal arranged at the other end of the accessory side terminal group, as well as the optical axis.

[0008] The second embodiment of the invention relates to an accessory that can be loaded and unloaded relative to a camera body, the camera body comprising: a photographing element, which is rectangular with an upper side and a lower side when the camera body is placed in a horizontal position, and is centered on the optical axis for incident light from a subject; a body-side terminal group, including a plurality of body-side terminals arranged in an arc shape above the upper side of the photographing element; and a body-side mounting member, which is arranged on the outside of the photographing element and the body-side terminal group and is annular with the optical axis as the center, the accessory comprising: an accessory-side mounting member, which is annular with the optical axis as the center and is in contact with the body-side mounting member; a cylindrical portion extending from the inner peripheral edge of the accessory-side mounting member in the direction of the optical axis; an accessory-side terminal group arranged on the inner side of the cylindrical portion, including a plurality of accessory-side terminals that are in contact with the body-side terminals when attached to the camera body; a first accessory-side protrusion extending from the cylindrical portion toward the accessory-side mounting member. The outer circumferential direction of the accessory is protruded, and the circumferential direction extends around the optical axis as the center. The second accessory-side protrusion protrudes from the cylindrical portion toward the outer circumferential direction of the accessory-side assembly and extends in the circumferential direction around the optical axis as the center. The third accessory-side protrusion protrudes from the cylindrical portion toward the outer circumferential direction of the accessory-side assembly and extends in the circumferential direction around the optical axis as the center. The fourth accessory-side protrusion protrudes from the cylindrical portion toward the outer circumferential direction of the accessory-side assembly and extends in the circumferential direction around the optical axis as the center. The first accessory-side protrusion and the third accessory-side protrusion are arranged on an accessory-side third straight line that intersects the accessory-side first straight line at approximately 45 degrees at the optical axis. The third accessory-side protrusion and the fourth accessory-side protrusion are arranged on an accessory-side fourth straight line that is orthogonal to the accessory-side third straight line at the optical axis. The accessory-side first straight line passes through the center of the accessory-side terminal group and the optical axis.

[0009] The third embodiment of the invention relates to an accessory that can be attached and detached from a camera body having a body-side mounting accessory and a body-side terminal, and comprises: an accessory-side mounting accessory that is annular in shape with the optical axis of light incident on the camera body as its center, and that contacts the body-side mounting accessory; a cylindrical portion that extends from the inner peripheral edge of the accessory-side mounting accessory in the direction of the optical axis; an accessory-side terminal group that is arranged on the inner side of the cylindrical portion and includes a plurality of accessory-side terminals that contact the body-side terminals when attached to the camera body; a first accessory-side protrusion that protrudes from the cylindrical portion toward the outer circumference of the accessory-side mounting accessory and extends in the circumferential direction with the optical axis as its center; a second accessory-side protrusion that protrudes from the cylindrical portion toward the outer circumference of the accessory-side mounting accessory and extends in the circumferential direction with the optical axis as its center; a third accessory A side protrusion protrudes from the cylindrical portion toward the outer circumference of the accessory-side assembly and extends in a circumferential direction centered on the optical axis; and a fourth accessory-side protrusion protrudes from the cylindrical portion toward the outer circumference of the accessory-side assembly and extends in a circumferential direction centered on the optical axis, the first accessory-side protrusion and the third accessory-side protrusion being arranged on an accessory-side third straight line intersecting the accessory-side first straight line at approximately 45 degrees at the optical axis, the second accessory-side protrusion and the fourth accessory-side protrusion being arranged on an accessory-side fourth straight line orthogonal to the accessory-side third straight line at the optical axis, the accessory-side first straight line passing through the center of the terminal arranged at one end of the accessory-side terminal group and the terminal arranged at the other end of the accessory-side terminal group, as well as the optical axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a cross-sectional view schematically showing the structure of the camera system.

[0011] Figure 2 This is a front view of the mount surface of the camera body when viewed from the interchangeable lens side.

[0012] Figure 3 This is a front view of the mounting surface of the camera body when viewed from the lens replacement side.

[0013] Figure 4 This is the front view of the leaf spring in the fuselage side assembly.

[0014] Figure 5 This is a front view of the interchangeable lens mounting surface when viewed from the camera body side.

[0015] Figure 6 This is a front view of the interchangeable lens mounting surface when viewed from the camera body side.

[0016] Figure 7 This is a three-dimensional diagram of the assembly surface for changing lenses.

[0017] Figure 8 This is a front view of the body-side claw and lens-side claw in the insertion position when viewed from the side where the lens is being replaced.

[0018] Figure 9 This is a front view of the body-side claw and lens-side claw in the attached position when viewed from the side where the lens is being replaced.

[0019] Figure 10 These are front and side views of the body-side claw and lens-side claw in a state of being over-rotated in the attachment direction when viewed from the lens exchange side.

[0020] Figure 11 This is a side view of the body-side claw and the lens-side claw in a state where they are over-rotated in the removal direction when viewed from the side where the lens is to be replaced.

[0021] Figure 12 This is a front view of the body-side claw and the lens-side claw in the first incorrect insertion state, viewed from the lens replacement side.

[0022] Figure 13A , B, and C are front views of the body-side claws and the lens-side claws in the second, third, and fourth incorrect insertion states when viewed from the lens replacement side.

[0023] Label Description

[0024] 1…Camera system, 2…Camera body, 3…Interchangeable lens, 44…Attachment direction, 210…Body-side mounting component, 211…Reference surface, 212…Opening, 213…Leaf spring, 220…Body-side terminal retaining portion, 270…Imaging element, 290…Body-side claw portion, 309…Lock pin sliding surface, 310…Lens-side mounting component, 311…Reference surface, 312…Cylinder, 320…Lens-side terminal retaining portion, 360…Imaging optical system, 390…Lens-side claw portion, B1–B4…1st to 4th straight lines on the body side, L1–L4…1st to 4th straight lines on the lens side, B5…Line, O…Optical axis. DETAILED DESCRIPTION

[0025] Figure 1 This is a cross-sectional view schematically illustrating the structure of a camera system 1 according to one embodiment of the present invention. The camera system 1 includes a camera body 2 and an interchangeable lens 3, which is an example of an accessory that is attachable to and detachable from the camera body 2. Other examples of accessories that are attachable to and detachable from the camera body 2 include a mount adapter, a teleconverter, and a wide-angle converter.

[0026] The interchangeable lens 3 includes a lens mount 310, a lens terminal holder 320, a lens CPU 330, a lens communication unit 340, a lens storage unit 350, a photographic optical system 360, and a drive unit 370. The lens mount 310 and the lens terminal holder 320 will be described in detail later.

[0027] The lens-side CPU 330 is composed of a microcomputer and its peripheral circuits. The lens-side communication unit 340 performs predetermined data communication with the camera body 2. The lens-side communication unit 340 is connected to the lens-side terminal (described later) provided on the lens-side terminal holder 320 and the lens-side CPU 330. The lens-side storage unit 350 is a non-volatile storage medium. The lens-side storage unit 350 is connected to the lens-side CPU 330. The lens-side storage unit 350 pre-stores predetermined control programs and the like to be executed by the lens-side CPU 330. The lens-side CPU 330 controls the interchangeable lens 3 by reading the control programs from the lens-side storage unit 350 and executing them.

[0028] The imaging optical system 360 forms a subject image on an imaging surface of the imaging element 270 (described later). The optical axis O of the imaging optical system 360 coincides with the center positions of the lens-side mount 310 and the body-side mount 210 (described later). Figure 1 The photographing optical system 360 generally comprises a lens 361, a focusing lens 362, and a lens 363. The focusing lens 362 adjusts the position of the image of the subject. The drive unit 370 is connected to the lens-side CPU 330 and includes an actuator (not shown). The drive unit 370 uses this actuator to move the focusing lens 362 forward and backward in the direction of the optical axis O (the +Z and -Z directions).

[0029] The camera body 2 includes a body-side mount 210, a body-side terminal holder 220, a body-side CPU 230, a body-side communication unit 240, a body-side storage unit 250, a power supply unit 260, and an imaging element 270. The body-side mount 210 and the body-side terminal holder 220 will be described in detail later.

[0030] The body-side CPU 230 is composed of a microcomputer and its peripheral circuits. Furthermore, the body-side CPU 230 performs various body controls. The body-side communication unit 240 communicates predetermined data with the interchangeable lens 3. The body-side communication unit 240 is connected to a plurality of body-side terminals (described later) provided on the body-side terminal holding unit 220 and to the body-side CPU 230.

[0031] The body-side storage unit 250 is a nonvolatile storage medium. It is connected to the body-side CPU 230. The body-side storage unit 250 pre-stores predetermined control programs and the like to be executed by the body-side CPU 230. The body-side CPU 230 controls the camera body 2 by reading the control programs from the body-side storage unit 250 and executing them.

[0032] The power supply unit 260 includes a power source and supplies power to the devices within the camera body 2 and the interchangeable lens 3. The power supply unit 260 is connected to the body-side terminals (described later) provided on the body-side terminal holder 220 and the body-side CPU 230. The imaging element 270 is, for example, a solid-state imaging element such as a CCD or CMOS. The imaging element 270 is connected to the body-side CPU 230, captures an image of a subject, and outputs an imaging signal. The processing of the output imaging signal is omitted.

[0033] (Description of the lens assembly mechanism)

[0034] The camera system 1 of this embodiment includes a so-called bayonet-type lens mount mechanism. The body-side mount 210 of the camera body 2 and the lens-side mount 310 of the interchangeable lens 3 will be described below in order.

[0035] (Body side mounting parts 210)

[0036] Figure 2 、 Figure 3 Schematically illustrates the attachment of the camera body 2 as viewed from the side of the interchangeable lens 3. Reference numeral 44 indicates the rotational direction of the interchangeable lens 3 when attached to the camera body 2, which is the rotational direction when viewed from the +Z direction, i.e., the attachment direction 44. Figure 2 、 Figure 3 FIG. 2 shows a state where the camera body 2 is placed in a horizontal position (horizontally). Figure 2 As shown, for the rectangular image sensor 270, when the camera body 2 is placed in the landscape position, the long side of the image sensor 270 is horizontal, that is, the landscape direction. That is, the long sides are the top and bottom sides, and the short sides are the right and left sides.

[0037] Figure 2 A first body-side straight line B1 extending in the vertical direction Y of the camera body 2 , indicated by a solid line, is the vertical direction when viewed from the photographer who uses the camera system 1 and places the camera body 2 in a horizontal position. Figure 2 A second body-side straight line B2 extending in the horizontal direction X of the camera body 2 , indicated by a solid line, is the left-right direction when viewed from the photographer who uses the camera system 1 and places the camera body 2 in a landscape position.

[0038] also, Figure 2 The X direction is the horizontal direction, the transverse direction, and the Y direction is the vertical direction, the longitudinal direction.

[0039] The first body-side straight line B1 and the second body-side straight line B2 are perpendicular to each other on the optical axis O (center). Figure 2 Straight lines B3 and B4, indicated by dashed lines, extend in directions intersecting the first body-side straight line B1 and the second body-side straight line B2 at 45 degrees on the optical axis O of the imaging element 270. These straight lines B3 and B4 are referred to as the third body-side straight line B3 and the fourth body-side straight line B4.

[0040] The assembly parts of the camera body 2 are provided in Figure 1 The body-side mounting member 210 and the body-side terminal holding portion 220 described above are provided. The body-side mounting member 210 includes an annular reference surface 211 having a constant width and arranged along a plane perpendicular to the optical axis O. The body-side mounting member 210 further includes a first body-side claw portion 290a, a second body-side claw portion 290b, a third body-side claw portion 290c, and a fourth body-side claw portion 290d.

[0041] In the following description, these four protruding portions, that is, the first to fourth body-side claw portions 290 a to 290 d are collectively referred to as the body-side claw portions 290 .

[0042] The body side claws 290 are arranged at intervals along the circular opening 212 of the body side assembly 210. Figure 2 As shown, the first body-side claw 290a is located at the upper right position, the second body-side claw 290b is located at the upper left position, the third body-side claw 290c is located at the lower left position, and the fourth body-side claw 290d is located at the lower right position. The first body-side claw 290a is located in an area above the second body-side straight line B2 and to the right of the first body-side straight line B1, the second body-side claw 290b is located in an area above the second body-side straight line B2 and to the left of the first body-side straight line B1, the third body-side claw 290c is located in an area below the second body-side straight line B2 and to the left of the first body-side straight line B1, and the fourth body-side claw 290d is located in an area below the second body-side straight line B2 and to the right of the first body-side straight line B1.

[0043] The first body-side claw portion 290a and the third body-side claw portion 290c are respectively arranged on the fourth body-side straight line B4 and in an area substantially symmetrical about the optical axis O. The second body-side claw portion 290b and the fourth body-side claw portion 290d are respectively arranged on the third body-side straight line B3 and in an area substantially symmetrical about the optical axis O.

[0044] In addition, if Figure 2 As shown, the circumferential center positions of the first to fourth body-side claws 290a to 290d do not overlap with the third body-side straight line B3 or the fourth body-side straight line B4.

[0045] like Figure 3 As shown, the circumferential lengths of the first to fourth body-side claws 290a to 290d are different. Specifically, the first body-side claw 290a is the longest, the third body-side claw 290c is the second longest, the fourth body-side claw 290d is the third longest, and the second body-side claw 290b is the shortest.

[0046] An angle α1 formed by a straight line connecting one end of the first body-side claw portion 290 a and the optical axis O and a straight line connecting the other end of the first body-side claw portion 290 a and the optical axis O is approximately 47 degrees, which is between 46.5 and 47.5 degrees.

[0047] An angle α3 formed by a straight line connecting one end of the third body-side claw portion 290 c and the optical axis O and a straight line connecting the other end of the third body-side claw portion 290 c and the optical axis O is approximately 42.5 degrees, which is between 42.0 and 43.0 degrees.

[0048] An angle α4 formed by a straight line connecting one end of the fourth body-side claw portion 290 d and the optical axis O and a straight line connecting the other end of the fourth body-side claw portion 290 d and the optical axis O is approximately 42 degrees, which is between 41.5 and 42.5 degrees.

[0049] An angle α2 formed by a straight line connecting one end of the second body-side claw portion 290 b and the optical axis O and a straight line connecting the other end of the second body-side claw portion 290 b and the optical axis O is approximately 40 degrees, which is between 40.0 and 41.0 degrees.

[0050] The first to fourth body-side claws 290a to 290d have the same radial length (claw height) and the same optical axis O direction length (claw thickness).

[0051] The body-side claw portion 290 protrudes from the opening 212 of the body-side mounting member 210 toward the optical axis O (the center of the imaging element 270). The circumference of the opening 212 includes a portion where the body-side claw portion 290 is present and a portion where the body-side claw portion 290 is not present. In the following description, the space between the first body-side claw portion 290a and the fourth body-side claw portion 290d on the circumference of the opening 212 of the body-side mounting member 210 is referred to as the first body-side insertion and removal portion 280a.

[0052] The insertion and removal portion is also referred to as an attachment / detachment portion, and the lens-side claws 290 a to 290 d pass through the attachment / detachment portion during attachment and detachment.

[0053] Similarly, the space between the first body-side claw portion 290a and the second body-side claw portion 290b is referred to as the second body-side plug-in portion 280b, the space between the second body-side claw portion 290b and the third body-side claw portion 290c is referred to as the third body-side plug-in portion 280c, and the space between the third body-side claw portion 290c and the fourth body-side claw portion 290d is referred to as the fourth body-side plug-in portion 280d. These four spaces, namely the first body-side plug-in portion 280a to the fourth body-side plug-in portion 280d, are collectively referred to as the body-side plug-in portion 280.

[0054] The first to fourth body-side plug-in sections 280a to 280d have different circumferential lengths. Specifically, the third body-side plug-in section 280c is the longest, the first body-side plug-in section 280a is the second longest, the fourth body-side plug-in section 280d is the third longest, and the second body-side plug-in section 280b is the shortest.

[0055] An angle β3 formed by a straight line connecting one end of the third body-side plugging portion 280c and the optical axis O and a straight line connecting the other end of the third body-side plugging portion 280c and the optical axis O is approximately 51 degrees, which is between 51.0 and 52.0 degrees.

[0056] An angle β1 formed by a straight line connecting one end of the first body-side plugging portion 280a and the optical axis O and a straight line connecting the other end of the first body-side plugging portion 280a and the optical axis O is approximately 50 degrees, and is between 50.0 and 51.0 degrees.

[0057] An angle β4 formed by a straight line connecting one end of the fourth body-side plugging portion 280d and the optical axis O and a straight line connecting the other end of the fourth body-side plugging portion 280d and the optical axis O is approximately 46 degrees, which is between 45.5 and 46.5 degrees.

[0058] An angle β2 formed by a straight line connecting one end of the second body-side plugging portion 280b and the optical axis O and a straight line connecting the other end of the second body-side plugging portion 280b and the optical axis O is approximately 39 degrees, which is between 39.0 and 40.0 degrees.

[0059] Of course, the total value of the angles α1 to α4 of the four first to fourth body-side claws 290a to 290d and the angles β1 to β4 of the four first to fourth body-side plugging portions 280a to 280d is 360 degrees.

[0060] The first body-side plug-in portion 280a is formed in an area above the third body-side straight line B3 and below the fourth body-side straight line B4, the second body-side plug-in portion 280b is formed in an area above the third body-side straight line B3 and above the fourth body-side straight line B4, the third body-side plug-in portion 280c is formed in an area below the third body-side straight line B3 and above the fourth body-side straight line B4, and the fourth body-side plug-in portion 280d is formed in an area below the third body-side straight line B3 and below the fourth body-side straight line B4.

[0061] The first body-side plug-in portion 280a and the third body-side plug-in portion 280c are each formed on the second body-side straight line B2 and in an area that is substantially symmetrical about the optical axis O. The second body-side plug-in portion 280b and the fourth body-side plug-in portion 280d are each formed on the first body-side straight line B1 and in an area that is substantially symmetrical about the optical axis O.

[0062] In addition, if Figure 2 As shown, the circumferential center positions of the first to fourth body-side plugging and unplugging portions 280a to 280d do not overlap with the first body-side straight line B1 or the second body-side straight line B2.

[0063] A body-side terminal holding portion 220 composed of a plurality of body-side terminals is provided inside the opening 212 of the body-side mounting member 210. The body-side terminal holding portion 220 has an arc shape corresponding to the shape of the annular body-side mounting member 210. The body-side terminal holding portion 220 is arranged on the inner circumference of the opening 212 of the body-side mounting member 210 and above the imaging element 270, preferably as shown in FIG. Figure 2 and Figure 3 As shown, it is arranged at the center of the upper portion of the imaging element 270. In other words, the center of the body-side terminal holding portion 220 in the circumferential direction is preferably located on the first body-side straight line B1.

[0064] The first body-side claw portion 290a is disposed in the upper right region of the body-side terminal holding portion 220, and the second body-side plug-in portion 280b is disposed in the upper left region of the body-side terminal holding portion 220. Thus, the angle formed by the straight line connecting one end of the body-side terminal holding portion 220 and the optical axis O and the straight line connecting the other end of the body-side terminal holding portion 220 and the optical axis O is smaller than the angle obtained by adding the angle α1 of the first body-side claw portion 290a and the angle β2 of the second body-side plug-in portion 280b.

[0065] As described above, the body side terminal holding portion 220 has a plurality of body side terminals. The plurality of body side terminals (referred to as a body side terminal group) are arranged in an arc shape on the upper portion of the upper side of the imaging element 270. The body side terminals are each a conductive pin. The body side terminals are directed in the -Z direction ( Figure 1 )Press.

[0066] Here, the -Z direction is the direction from the camera body 2 toward the interchangeable lens 3 and is the direction toward the subject. Furthermore, the +Z direction is the direction from the interchangeable lens 3 toward the camera body 2 and is the direction toward the imaging element 270.

[0067] The body side mounting member 210 has a hole through which the locking pin 214 passes. Figure 2 and Figure 3 The hole for the locking pin 214 is located in the upper right area of ​​the fourth body-side claw 290d. Specifically, the hole for the locking pin 214 is located between the area where the fourth body-side claw 290d is located and the area where the first body-side claw 290a is located on the annular reference surface 211 of the body-side mounting member 210. The locking pin 214 is biased in the -Z direction (toward the subject) by a spring (not shown). By pressing a lock release button (not shown), the locking pin 214 can be moved in the +Z direction (toward the imaging element 270) against the spring's biasing force.

[0068] Figure 4 This is a schematic diagram showing the mounting of the camera body 2 after the body-side mount 210 is removed, as viewed from the side of the interchangeable lens 3. A first leaf spring 213a is provided at a position corresponding to the first body-side claw 290a, that is, on the back side of the first body-side claw 290a.

[0069] Similarly, a second leaf spring 213b is provided at a position corresponding to the second body side claw portion 290b, that is, on the back side of the second body side claw portion 290b, a third leaf spring 213c is provided at a position corresponding to the third body side claw portion 290c, that is, on the back side of the third body side claw portion 290c, and a fourth leaf spring 213d is provided at a position corresponding to the fourth body side claw portion 290d, that is, on the back side of the fourth body side claw portion 290d.

[0070] In the following description, these four leaf springs 213a to 213d are collectively referred to as leaf springs 213. The leaf springs 213 are located on the surface of the body-side claws 290 that faces the image sensor 270, and press the corresponding lens-side claws (described later) 390 toward the image sensor 270 (in the +Z direction).

[0071] like Figure 4 As shown, when the optical axis O and the attachment direction 44 ( Figure 2 The rear end of the body-side terminal holding portion 220 in the attachment direction 44 is arranged near a straight line B5 connecting the rear end, or terminal end, of the body-side terminal holding portion 220 (shown in the figure). The second leaf spring 213b, the third leaf spring 213c, and the fourth leaf spring 213d are arranged at approximately 90-degree intervals around the optical axis O, starting from the first leaf spring 213a.

[0072] (Lens side mounting accessory 310)

[0073] Figure 5 、 Figure 6 1 is a diagram schematically showing the assembly of the interchangeable lens 3 when viewed from the camera body 2 side (viewed from the rear of the interchangeable lens 3 ). Figure 5 The first straight line L1 on the lens side extending in the vertical direction Y of the interchangeable lens 3, shown by the solid line, is the vertical direction when viewed from the photographer using the camera system 1 when the camera body 2 is placed in a horizontal position. Figure 5 The second lens-side straight line L2 extending in the horizontal direction X of the interchangeable lens 3 indicated by the solid line is the left-right direction when viewed from the photographer who uses the camera system 1 and holds the camera body 2 in a horizontal position.

[0074] The first straight line L1 on the lens side and the second straight line L2 on the lens side are perpendicular to each other on the optical axis O (center) of the interchangeable lens 3. Figure 5 As shown by the dashed lines, lines extending in a direction intersecting the first lens-side straight line L1 and the second lens-side straight line L2 at a 45-degree angle on the optical axis O are designated as the third lens-side straight line L3 and the fourth lens-side straight line L4. When the interchangeable lens 3 is attached to the camera body 2 in a usable state, the first body-side straight line B1 coincides with the first lens-side straight line L1, the second body-side straight line B2 coincides with the second lens-side straight line L2, the third body-side straight line B3 coincides with the fourth lens-side straight line L4, and the fourth body-side straight line B4 coincides with the third lens-side straight line L3. Furthermore, these straight lines do not necessarily need to be completely aligned with one another and may deviate from one another within a range that allows the interchangeable lens 3 to be properly attached to the camera body 2.

[0075] The assembly parts for the replacement lens 3 are available in Figure 1 The lens-side mount 310 and lens-side terminal retaining portion 320 described above are shown. The lens-side mount 310 is formed into a circular ring centered on the optical axis O of the interchangeable lens 3 and is arranged along a plane perpendicular to the optical axis O. The lens-side mount 310 has a reference surface 311 that contacts the reference surface 211 of the body-side mount 210 when the interchangeable lens 3 is attached to the camera body 2. The reference surface 311 is formed into a circular ring centered on the optical axis O and is arranged along a plane perpendicular to the optical axis O. On the rear end surface of the reference surface 311 in the direction of the optical axis O, a locking pin sliding surface 309 is formed into a concave shape facing the -Z direction in a cross section along the Z direction. The locking pin sliding surface 309 allows the locking pin 214, described later, to slide while the interchangeable lens 3 is attached. The locking pin sliding surface 309 is formed into a circular ring centered on the optical axis O and is arranged along a plane perpendicular to the optical axis O.

[0076] The lens-side mount 310 is secured to a fixing member disposed within the interchangeable lens 3 by screwing with screws 313. When viewing the lens-side mount 310 from the camera body 2, the screws 313 are disposed at approximately 90-degree intervals around the optical axis O. Furthermore, four screws 313 are disposed on the outer periphery of four lens-side claws 390, described later. Furthermore, the screws 313 are disposed on the outer periphery of both circumferential ends of the lens-side terminal retaining portion 320.

[0077] The lens-side mount 310 includes a cylindrical portion 312. The cylindrical portion 312 extends in a direction along the optical axis O (hereinafter referred to as the optical axis O direction) at the inner peripheral edge of the lens-side mount 310, that is, the inner peripheral edge of the reference surface 311. When the interchangeable lens 3 is attached to the camera body 2, the rear end of the cylindrical portion 312 in the optical axis O direction is located closer to the camera body 2 than the reference surface 311. The lens-side mount 310 includes a first lens-side claw 390a, a second lens-side claw 390b, a third lens-side claw 390c, and a fourth lens-side claw 390d, spaced apart from each other, along the outer periphery of the rear end of the cylindrical portion 312 in the optical axis O direction.

[0078] In the following description, these four protruding portions, ie, the first to fourth lens-side claw portions 390 a to 390 d , are collectively referred to as lens-side claw portions 390 .

[0079] The lens side claw portion 390 is provided to protrude from the outer peripheral edge of the cylindrical portion 312 of the lens side mount 310 toward the outer circumference of the lens side mount 310 and is substantially perpendicular to the optical axis O. In addition, the lens side claw portion 390 extends in the circumferential direction centered on the optical axis O. Figure 5 and Figure 6 As shown, the first lens-side claw 390a is positioned at the upper left, the second lens-side claw 390b is positioned at the upper right, the third lens-side claw 390c is positioned at the lower right, and the fourth lens-side claw 390d is positioned at the lower left. Specifically, the first lens-side claw 390a is positioned above the second lens-side straight line L2 and to the left of the first lens-side straight line L1, the second lens-side claw 390b is positioned above the second lens-side straight line L2 and to the right of the first lens-side straight line L1, the third lens-side claw 390c is positioned below the second lens-side straight line L2 and to the right of the first lens-side straight line L1, and the fourth lens-side claw 390d is positioned below the second lens-side straight line L2 and to the left of the first lens-side straight line L1.

[0080] In addition, the first claw 390a on the lens side and the third claw 390c on the lens side are respectively arranged on the line of the third straight line L3 on the lens side and in an area roughly symmetrical with the optical axis O as the center, and the second claw 390b on the lens side and the fourth claw 390d on the lens side are respectively arranged on the line of the fourth straight line L4 on the lens side and in an area roughly symmetrical with the optical axis O as the center.

[0081] Furthermore, the third lens-side straight line L3 and the fourth lens-side straight line L4 do not necessarily pass through the center positions of the first lens-side claw portion 390 a to the fourth lens-side claw portion 390 d in the circumferential direction.

[0082] When the interchangeable lens 3 is attached to the camera body 2, the body-side claw portion 290 is positioned between the lens-side mount 310 and the lens-side claw portion 390 in the direction of the optical axis O. At this time, the first lens-side claw portion 390a contacts the leaf spring 213a of the first body-side claw portion 290a, the second lens-side claw portion 390b contacts the leaf spring 213b of the second body-side claw portion 290b, the third lens-side claw portion 390c contacts the leaf spring 213c of the third body-side claw portion 290c, and the fourth lens-side claw portion 390d contacts the leaf spring 213d of the fourth body-side claw portion 290d.

[0083] The lens-side claw 390 includes a biased portion, which acts as a contact portion that contacts the leaf spring 213 and is biased away from the body-side claw 290. The shape of the biased portion can be any shape as long as the leaf spring 213 sufficiently biases the lens-side claw 390. The contact between the leaf spring 213 and the biased portion can be point contact, line contact, or surface contact. The shape and material of the leaf spring 213 can be modified as appropriate, as long as they sufficiently press the lens-side claw 390.

[0084] When the leaf spring 213 of the body-side claw portion 290 contacts the lens-side claw portion 390, the leaf spring 213 presses the lens-side claw portion 390 in a direction (+Z direction) away from the body-side claw portion 290 along the optical axis O. By pressing the lens-side claw portion 390 in the +Z direction (toward the imaging element 270), the lens-side mount 310 is pressed toward the body-side mount 210, thereby stabilizing the attachment of the camera body 2 and the interchangeable lens 3.

[0085] Furthermore, the lens-side claw portion 390 and the body-side claw portion 290 do not need to have the same circumferential length. The circumferential length of the lens-side claw portion 390 can be varied within a range within which the leaf spring 213 can press the lens-side claw portion 390. Furthermore, when the interchangeable lens 3 is attached to the camera body 2, the entire surface of the lens-side claw portion 390 does not need to face the entire surface of the body-side claw portion 290. The position of the circumferential end of the lens-side claw portion may differ from the position of the circumferential end of the body-side claw portion.

[0086] In addition, the lens-side claw portion 390 and the body-side insertion portion 280 do not need to have roughly the same circumferential length. The circumferential length of the inserted lens-side claw portion 390 only needs to be less than the circumferential length of the body-side insertion portion 280.

[0087] Similarly, the body-side claw portion 290 and the lens-side insertion portion 380 do not need to have the same circumferential length. The circumferential length of the inserted body-side claw portion 290 only needs to be less than the circumferential length of the lens-side insertion portion 380 .

[0088] like Figure 6 As shown, the circumferential lengths of the first through fourth lens-side claws 390a, 390d are different. Furthermore, the angles formed by the straight line connecting one circumferential end of each of the first through fourth lens-side claws 390a, 390d and the optical axis O are different from the straight line connecting the other circumferential ends of each of the first through fourth lens-side claws 390a, 390d and the optical axis O. Specifically, the third lens-side claw 390c is the longest, the first lens-side claw 390a is the second longest, the fourth lens-side claw 390d is the third longest, and the second lens-side claw 390b is the shortest.

[0089] An angle α7 formed by a straight line connecting one end of the third lens-side claw portion 390 c and the optical axis O and a straight line connecting the other end of the third lens-side claw portion 390 c and the optical axis O is approximately 48.5 degrees, which is between 48.0 and 49.0 degrees.

[0090] An angle α5 formed by a straight line connecting one end of the first lens-side claw portion 390 a and the optical axis O and a straight line connecting the other end of the first lens-side claw portion 390 a and the optical axis O is approximately 48 degrees, which is between 47.5 and 48.5 degrees.

[0091] An angle α8 formed by a straight line connecting one end of the fourth lens-side claw portion 390 d and the optical axis O and a straight line connecting the other end of the fourth lens-side claw portion 390 d and the optical axis O is approximately 44 degrees, which is between 43.0 and 45.0 degrees.

[0092] An angle α6 formed by a straight line connecting one end of the second lens-side claw portion 390 b and the optical axis O and a straight line connecting the other end of the second lens-side claw portion 390 b and the optical axis O is approximately 36 degrees, which is between 35.5 and 36.5 degrees.

[0093] Furthermore, an angle α6 formed by a straight line connecting one end of the second lens-side claw 390 b and the optical axis O and a straight line connecting the other end of the second lens-side claw 390 b and the optical axis O is smaller than a rotation angle described later when the interchangeable lens 3 is attached to the camera body 2 .

[0094] The first to fourth lens-side claws 390a to 390d have substantially the same radial length (claw height) and substantially the same length in the optical axis O direction (claw thickness).

[0095] Furthermore, at least one of the lens-side claws 390 may be partially cut out to a degree that does not affect the attachment state to the camera body 2. Even if a portion of the first lens-side claw 390a is cut out, the entirety of the protrusion located in the area facing the first body-side claw 290a and the cutout portion is defined as the first lens-side claw 390a. The same applies to the second, third, and fourth lens-side claws 390b, 390d, and 390d, respectively. The cutting method may be to divide the first lens-side claw 390a into two or more circumferential sections, to omit a portion of the first lens-side claw 390a, or to shorten the radial length of at least a portion of the first lens-side claw 390a. Therefore, the lens-side claw 390 may also be cut out to a portion located on the third lens-side straight line L3 or the fourth lens-side straight line L4.

[0096] The circumferential length of the first lens-side claw 390a can also be changed within the range of the corresponding first body-side insertion and removal portion 280a during insertion. The same applies to the second lens-side claw 390b, the third lens-side claw 390c, and the fourth lens-side claw 390d.

[0097] Furthermore, the radial thickness of the cylindrical portion 312 can be changed as appropriate, and the cylindrical portion 312 may have a shape in which at least a portion protrudes radially inward compared to the cylindrical portion 312 of the present embodiment.

[0098] The lens-side claws 390 protrude radially outward from the outer periphery of the cylindrical portion 312 . The outer periphery of the cylindrical portion 312 includes a portion where the lens-side claws 390 are present and a space where the lens-side claws 390 are not present.

[0099] In the following description, the space 380d between the first lens-side claw 390a and the fourth lens-side claw 390d on the outer circumference of the cylindrical portion 312 is referred to as the first lens-side insertion and removal portion 380a. Similarly, the space 380b between the first lens-side claw 390a and the second lens-side claw 390b is referred to as the second lens-side insertion and removal portion 380b, the space 380c between the second lens-side claw 390b and the third lens-side claw 390c is referred to as the third lens-side insertion and removal portion 380c, and the space 380d between the third lens-side claw 390c and the fourth lens-side claw 390d is referred to as the fourth lens-side insertion and removal portion 380d.

[0100] These four lens-side first to fourth insertion and removal portions 380 a to 380 d are collectively referred to as a lens-side insertion and removal portion 380 .

[0101] The first lens-side plug-in portion 380a to the fourth lens-side plug-in portion 380d have different circumferential lengths. Specifically, the second lens-side plug-in portion 380b is the longest, the first lens-side plug-in portion 380a is the second longest, the fourth lens-side plug-in portion 380d is the third longest, and the third lens-side plug-in portion 380c is the shortest.

[0102] An angle β6 formed by a straight line connecting one end of the second lens-side inserting and removing portion 380b and the optical axis O and a straight line connecting the other end of the second lens-side inserting and removing portion 380b and the optical axis O is approximately 50 degrees, which is between 49.5 degrees and 50.5 degrees.

[0103] An angle β5 formed by a straight line connecting one end of the first lens-side inserting and removing portion 380a and the optical axis O and a straight line connecting the other end of the first lens-side inserting and removing portion 380a and the optical axis O is approximately 45 degrees, and is between 44.5 and 45.5 degrees.

[0104] An angle β8 formed by a straight line connecting one end of the fourth lens-side inserting and removing portion 380d and the optical axis O and a straight line connecting the other end of the fourth lens-side inserting and removing portion 380d and the optical axis O is approximately 44.5 degrees, which is between 44.0 and 45.0 degrees.

[0105] An angle β7 formed by a straight line connecting one end of the third lens-side plug-in portion 380c and the optical axis O and a straight line connecting the other end of the third lens-side plug-in portion 380c and the optical axis O is approximately 44 degrees, which is between 43.5 and 44.5 degrees.

[0106] Of course, the total value of the angles α5 to α8 of the four first to fourth lens-side claws 390a to 390d and the angles β5 to β8 of the four first to fourth lens-side plug-in parts 380a to 380d is 360 degrees.

[0107] In addition, the first plug-in portion 380a on the lens side and the third plug-in portion 380c on the lens side are respectively arranged on the line of the second straight line L2 on the lens side and in an area roughly symmetrical with the optical axis O as the center, and the second plug-in portion 380b on the lens side and the fourth plug-in portion 380d on the lens side are respectively arranged on the line of the first straight line L1 on the lens side and in an area roughly symmetrical with the optical axis O as the center.

[0108] Furthermore, the first lens-side straight line L1 and the second lens-side straight line L2 do not necessarily pass through the center positions of the first to fourth lens-side insertion and removal portions 380 a to 380 d in the circumferential direction.

[0109] A lens-side terminal holding portion 320 composed of a plurality of lens-side terminals is provided inside the cylindrical portion 312. The lens-side terminal holding portion 320 has an arc shape corresponding to the shape of the annular lens-side mount 310. The lens-side terminal holding portion 320 is arranged on the upper portion of the lens-side mount 310 in parallel with the opening of the lens-side mount 310, preferably as shown in FIG. Figure 5 and Figure 6 That is, the center of the lens-side terminal holding portion 320 in the circumferential direction is preferably located on the first lens-side straight line L1.

[0110] The first lens-side claw portion 390a is located on the upper left side of the lens-side terminal holding portion 320, and the second lens-side plug-in / unplug portion 380b is located on the upper right side of the lens-side terminal holding portion 320. Thus, the angle formed by the straight line connecting one end of the lens-side terminal holding portion 320 and the optical axis O and the straight line connecting the other end of the lens-side terminal holding portion 320 and the optical axis O is smaller than the angle obtained by adding the angle α5 of the first lens-side claw portion 390a and the angle β6 of the second lens-side plug-in / unplug portion 380b.

[0111] As described above, the lens-side terminal holding portion 320 has a plurality of lens-side terminals. The plurality of lens-side terminals (referred to as a lens-side terminal group) are arranged in a single row in an arc shape on the inner side of the lens-side mounting member 310. The lens-side terminal group is arranged with its conductive contact surface facing the +Z direction ( Figure 1 ) is configured in an exposed manner.

[0112] All contact surfaces of the plurality of lens-side terminals may be located closer to the +Z direction than the rear end of the lens-side claw portion 390 in the optical axis O direction, or may be located closer to the −Z direction than the rear end of the lens-side claw portion 390 in the optical axis O direction.

[0113] In addition, part of the contact surfaces of the multiple lens side terminals can be located closer to the +Z direction than the rear end of the lens side claw portion 390 in the optical axis O direction, and the remaining contact surfaces can be located closer to the -Z direction than the rear end of the lens side claw portion 390 in the optical axis O direction.

[0114] The lens side mount 310 has a lock pin receiving portion 314. Figure 5 and Figure 6 As shown, the lock pin receiving portion 314 is arranged on the upper left of the fourth lens-side claw portion 390d. In other words, the lock pin receiving portion 314 is arranged between the portion of the lock pin sliding surface 309 of the lens-side mount 310 corresponding to the outer periphery of the first lens-side claw portion 390a and the portion corresponding to the outer periphery of the fourth lens-side claw portion 390d.

[0115] The lock pin receiving portion 314 is a groove that receives the lock pin 214 of the camera body 2 when the interchangeable lens 3 is attached to the camera body 2. The groove extends from the lock pin sliding surface 309 of the lens side mount 310 toward the -Z direction ( Figure 1 ) is set to a concave shape.

[0116] When the unlock button on the camera body 2 is not pressed, the -Z direction end of the lock pin 214 (the tip of the lock pin 214 on the subject side) is received in the lock pin receiving portion 314 of the lens-side mount 310. Furthermore, when the unlock button on the camera body 2 is pressed, the -Z direction end of the lock pin 214 is located closer in the +Z direction than the lock pin sliding surface 309. Therefore, when the interchangeable lens 3 and the camera body 2 are rotated relative to each other while the unlock button on the camera body 2 is pressed, the lock pin 214 does not contact the lock pin sliding surface 309.

[0117] When the interchangeable lens 3 is attached to the camera body 2, the multiple body-side terminals physically contact the corresponding multiple lens-side terminals. This contact electrically connects the multiple body-side terminals to the multiple lens-side terminals. In other words, the multiple body-side terminals and the multiple lens-side terminals are electrically conductive.

[0118] like Figure 7 As shown, a restriction pin 315 is disposed between the reference surface 311 of the lens-side mounting member 310 and the fourth lens-side claw 390d, extending in a direction protruding from the outer circumferential surface of the cylindrical portion 312. The restriction pin 315 is disposed on the rear end side, or terminal end side, of the fourth lens-side claw 390d in the attachment direction 44 (a position close to the third lens-side claw 390c). When the fourth lens-side claw 390d is viewed from the rear of the interchangeable lens 3, a portion of the restriction pin 315 is disposed on the back side of the fourth lens-side claw 390d.

[0119] Furthermore, in the present embodiment, the restriction pin 315 is screwed to the cylindrical portion 312 from the radially outer side using a screw member, but the shape and material of the restriction pin 315 are not limited thereto.

[0120] (How to attach the interchangeable lens 3 to the camera body 2)

[0121] Next, refer to Figure 8 、 Figure 9 A method of attaching the interchangeable lens 3 to the camera body 2 will be described. Figure 8 、 Figure 9 2 is a diagram showing the positional relationship between the body side claw portion 290 of the camera body 2 and the lens side claw portion 390 of the interchangeable lens 3, so that the contact state between the claw portions can be understood. Figure 8 , Figure 9The figure is a diagram when the body side mount 210 and the lens side mount 310 are viewed from the subject side toward the imaging element 270 side (viewed along the +Z direction). Figure 5 、 Figure 6 A left-right flip occurred.

[0122] When attaching the interchangeable lens 3 to the camera body 2, first, align the position of the mark (not shown) marked on the outer peripheral surface of the interchangeable lens 3 with the mark (not shown) marked on the outer surface of the camera body 2, make the body side mounting part 210 and the lens side mounting part 310 face each other, and insert each lens side claw part 390 into each body side insertion and removal part 280. Figure 8 As shown, the first lens-side claw 390a is inserted into the first body-side insertion portion 280a, the second lens-side claw 390b is inserted into the second body-side insertion portion 280b, the third lens-side claw 390c is inserted into the third body-side insertion portion 280c, and the fourth lens-side claw 390d is inserted into the fourth body-side insertion portion 280d. At this point, the first body-side claw 290a is inserted into the second lens-side insertion portion 380b, the second body-side claw 290b is inserted into the third lens-side insertion portion 380c, the third body-side claw 290c is inserted into the fourth lens-side insertion portion 380d, and the fourth body-side claw 290d is inserted into the first lens-side insertion portion 380a. The position of the interchangeable lens 3 relative to the camera body 2 at this point is referred to as the insertion position, and the state in which the interchangeable lens 3 is positioned for insertion into the camera body 2 is referred to as the insertion state.

[0123] From the above insertion position, move the interchangeable lens 3 to Figure 8 The attachment direction 44 is shown. The attachment direction 44 is a direction along a circumferential direction centered on the optical axis O within a plane substantially perpendicular to the optical axis O. As the interchangeable lens 3 rotates, the first body-side claw 290a and the leaf spring 213a enter the space between the first lens-side claw 390a and the reference surface 311.

[0124] Specifically, when the interchangeable lens 3 is inserted in the +Z direction, the first lens-side claw 390a enters the imaging element 270 side (+Z side) of the first body-side claw 290a, and the first lens-side claw 390a faces the imaging element 270 side (+Z side) of the leaf spring 213a. Simultaneously, the first body-side claw 290a and the leaf spring 213a enter the space between the first lens-side claw 390a and the reference surface 311. Similarly, the second body-side claw 290b and the leaf spring 213b enter the space between the second lens-side claw 390b and the reference surface 311, the third body-side claw 290c and the leaf spring 213c enter the space between the third lens-side claw 390c and the reference surface 311, and the fourth body-side claw 290d and the leaf spring 213d enter the space between the fourth lens-side claw 390d and the reference surface 311. At this time, the lens side terminal group and the body side terminal group are in contact with each other in sequence.

[0125] Furthermore, although the interchangeable lens 3 is rotated in the attachment direction 44 relative to the camera body 2 , the camera body 2 may be rotated in the opposite direction to the attachment direction 44 relative to the interchangeable lens 3 .

[0126] Figure 9 It is shown from Figure 8 The figure shows the interchangeable lens 3 after being rotated by a first angle (hereinafter referred to as the first rotation angle) in the attachment direction 44 relative to the camera body 2 from the inserted position. The interchangeable lens 3 at this time is referred to as the attached position. In this embodiment, the first rotation angle is approximately 40 degrees, and is between 38.5 and 41.5 degrees.

[0127] In the attached position, the locking pin 214 of the camera body 2 is pressed in the -Z direction and enters the locking pin receiving portion 314 of the interchangeable lens 3. When the locking pin 214 enters the locking pin receiving portion 314, the rotation of the interchangeable lens 3 relative to the camera body 2 for removal is restricted. Specifically, when the body-side claws 290 and the lens-side claws 390 face each other in the attached position of the interchangeable lens 3, the relative circumferential positions of the body-side mount 210 and the lens-side mount 310 are determined.

[0128] Furthermore, the lens-side claw portion 390 is pressed toward the imaging element 270 (in the +Z direction) by the leaf spring 213, causing the reference surface 311 of the lens-side mount 310 to contact the reference surface 211 of the body-side mount 210. With the lens-side mount 310 in surface contact with the body-side mount 210 and biased by the leaf spring 213, the interchangeable lens 3 is securely attached to the camera body 2.

[0129] In the attached position, each of the plurality of lens-side terminals contacts and is electrically connected to a corresponding each of the plurality of body-side terminals.

[0130] In addition, from Figure 8 The lens side claws 390 are inserted into the corresponding body side plug-in parts 280 at the insertion position until they are about to be inserted. Figure 9 Since the lock pin 214 of the camera body 2 is pressed in the -Z direction, the -Z direction end of the lock pin 214 contacts the lock pin sliding surface 309 of the lens side mount 310 in the during-attachment state.

[0131] As the interchangeable lens 3 rotates, the -Z direction end portion of the locking pin 214 slides on the locking pin sliding surface 309 of the interchangeable lens 3. Therefore, within the first rotational angle range in the direction opposite to the attachment direction 44 from the locking pin receiving portion 314 of the locking pin sliding surface 309, no fixing screw is provided to secure the lens-side mount 310. Since no fixing screw is provided within this first rotational angle range in the opposite direction, the -Z direction end portion of the locking pin 214 does not collide with the fixing screw when sliding on the locking pin sliding surface 309, thereby enabling smooth attachment and detachment of the interchangeable lens 3.

[0132] (How to remove the interchangeable lens 3 from the camera body 2)

[0133] In the attached position, when the user presses the unlock button (not shown) of the camera body, the locking pin 214 retracts from the locking pin receiving portion 314 toward the imaging element 270. As a result, the rotation restriction of the interchangeable lens 3 relative to the camera body 2 is released, and the lens side mount 310 can be rotated relative to the body side mount 210. When the interchangeable lens 3 is rotated relative to the camera body 2 in the direction opposite to the attachment direction 44 (detachment direction) while pressing the unlock button (not shown), each lens side claw portion 390 moves from a position opposite to the image side surface of each body side claw portion 290 toward a position of each body side insertion and removal portion 280, reaching the position of each body side insertion and removal portion 280. Figure 8 Insertion location shown.

[0134] (Explanation of over-rotation state in the attachment direction)

[0135] Next, refer to Figure 10 A description will be given of an over-rotated state in which the interchangeable lens 3 is rotated relative to the camera body 2 by a first rotation angle or more in the attachment direction 44 . Figure 10It is a schematic diagram showing the positional relationship between the fourth claw 290d on the body side of the camera body 2 and the fourth claw 390d on the lens side of the interchangeable lens 3. The upper portion (a) of the dot-dash line is a diagram when viewed from the subject side toward the imaging element 270 side, and the lower portion (b) of the dot-dash line is a diagram when the lens mounting mechanism is viewed from the side. When attaching the interchangeable lens 3 to the camera body 2, if the user rotates the interchangeable lens 3 in the attachment direction 44 while pressing the lock release button, the locking pin 214 will not enter the locking pin receiving portion 314 in the attached position. As a result, it is possible to Figure 9 The interchangeable lens 3 is further rotated relative to the camera body 2 from the attached position shown. When the interchangeable lens 3 is further rotated relative to the camera body 2 in the attachment direction 44 from the attached position, the restriction pin 315 abuts against the rear end of the fourth body-side claw portion 290d in the attachment direction 44, thereby preventing the interchangeable lens 3 from rotating further relative to the camera body 2.

[0136] (Description of over-rotation in the disassembly direction)

[0137] Next, refer to Figure 11 The following describes an over-rotated state in which the interchangeable lens 3 is rotated relative to the camera body 2 in the direction opposite to the attachment direction 44 (detachment direction) beyond the insertion position. Figure 11 This is a side view of a portion of the lens assembly mechanism in a state where the lens assembly is over-rotated in the removal direction. Figure 7 As shown, since the limiting pin 315 is arranged at the terminal end of the attachment direction 44 of the fourth claw 390d on the lens side, when the user wants to rotate the interchangeable lens 3 in the opposite direction after inserting it relative to the camera body 2, the limiting pin 315 will abut against the front end of the attachment direction 44 of the third claw 290c on the body side, thereby preventing the interchangeable lens 3 from further rotating in the removal direction relative to the camera body 2.

[0138] In this manner, the restricting pin 315 abuts against the circumferential end of the body-side claw portion 290, thereby preventing both over-rotation in the attachment direction 44 and over-rotation in the removal direction. Since the restricting pin 315 prevents both over-rotation in the attachment direction 44 and over-rotation in the removal direction, there is no need to prepare two components: a component for preventing over-rotation in the attachment direction 44 and a component for preventing over-rotation in the removal direction.

[0139] Furthermore, since the restriction pin 315 is prevented from over-rotating by the circumferential end portion of the body-side claw portion 290 , there is no need to separately provide a member that abuts against the restriction pin 315 when over-rotating.

[0140] (Description of the incorrect insertion state)

[0141] Next, a description will be given of an incorrect insertion state in which the user attempts to insert the interchangeable lens 3 into the camera body 2 in the wrong position without aligning the mark on the interchangeable lens 3 with the mark on the camera body 2. In the incorrect insertion state, the lens-side claw portion 390 does not pass through the body-side insertion and removal portion 280, so the positional relationship between the lens-side claw portion 390 and the body-side claw portion 290 on the optical axis O is different from that in the inserted position. Figure 12 、 Figure 13A 、 Figure 13B 、 Figure 13C 2 is a schematic diagram showing the positional relationship between the body side claw portion 290 of the camera body 2 and the lens side claw portion 390 of the interchangeable lens 3, so that the contact state between the claw portions can be understood. Figure 12 、 Figure 13A 、 Figure 13B 、 Figure 13C The figure is a diagram when the body side mount 210 and the lens side mount 310 are viewed from the subject side toward the imaging element 270 side (viewed along the +Z direction). Figure 5 、 Figure 6 As an example of a mis-insertion state, Figure 12 The figure shows that the mark of the interchangeable lens 3 and the mark of the camera body 2 are deviated from the insertion position to the removal direction by 15 degrees. Figures 13A to 13C 3 shows a state where the mark of the interchangeable lens 3 and the mark of the camera body 2 are deviated from the insertion position by 90 degrees.

[0142] Figure 12 The figure shows a state where the insertion position is deviated by 15 degrees from the removal direction (the first mis-insertion state). Figure 12 As shown by the hatching, the lens-side claw portion 390 abuts against the body-side claw portion 290 at four locations indicated by reference numerals γ1 to γ4, so that the lens-side claw portion 390 is not inserted into the body-side insertion and removal portion 280. In other words, in the first mis-insertion state, the lens-side claw portion 390 abuts against the body-side claw portion 290 at four locations, thereby reliably preventing mis-insertion.

[0143] Figure 13A This figure shows a state in which the mark of the interchangeable lens 3 and the mark of the camera body 2 are deviated by approximately 90 degrees from the insertion position in the removal direction (second incorrect insertion state). Figure 13B This is a diagram showing a third incorrect insertion state in which the mark of the interchangeable lens 3 and the mark of the camera body 2 are deviated by approximately 180 degrees from the insertion position in the removal direction. Figure 13C This is a diagram showing a fourth incorrect insertion state in which the mark of the interchangeable lens 3 and the mark of the camera body 2 are deviated from the insertion position by approximately 270 degrees in the removal direction.

[0144] like Figure 13AAs shown, in the second mis-insertion state, the portion of the third lens-side claw 390c indicated by γ5 abuts against the first body-side claw 290a, and the portion indicated by γ7 abuts against the second body-side claw 290b, preventing the third lens-side claw 390c from being inserted into the second body-side insertion and removal portion 280b. Furthermore, the portion of the first lens-side claw 390a indicated by γ6 abuts against the fourth body-side claw 290d, preventing the first lens-side claw 390a from being inserted into the fourth body-side insertion and removal portion 280d. Thus, in the second mis-insertion state, the lens-side claw 390 abuts against the body-side claw 290 at three locations, preventing mis-insertion.

[0145] like Figure 13B As shown, in the third mis-insertion state, the portion indicated by γ8 of the fourth lens-side claw 390d abuts the first body-side claw 290a, preventing the fourth lens-side claw 390d from being inserted into the second body-side insertion and removal portion 280b. Furthermore, the portion indicated by γ9 of the first lens-side claw 390a abuts the third body-side claw 290c, preventing the first lens-side claw 390a from being inserted into the first body-side insertion and removal portion 280a. Thus, in the third mis-insertion state, the lens-side claw 390 abuts the body-side claw 290 at two locations, preventing mis-insertion.

[0146] like Figure 13C As shown, in the fourth mis-insertion state, the portion indicated by γ10 of the first lens-side claw 390a abuts the first body-side claw 290a, and the portion indicated by γ11 abuts the second body-side claw 290b, preventing the first lens-side claw 390a from being inserted into the second body-side insertion and removal portion 280b. Furthermore, the portion indicated by γ12 of the third lens-side claw 390c abuts the third body-side claw 290c, preventing the third lens-side claw 390c from being inserted into the fourth body-side insertion and removal portion 280d. Thus, in the fourth mis-insertion state, the lens-side claw 390 abuts the body-side claw 290 at three locations, preventing mis-insertion.

[0147] (1) As described above, in an erroneous insertion state other than the insertion state in which the interchangeable lens 3 is positioned at the insertion position, the lens-side claw portion 390 abuts against the body-side claw portion 290 at at least two locations. Therefore, in a position other than the insertion position, the lens-side claw portion 390 is prohibited from being inserted into the body-side insertion and removal portion 280. Therefore, even if the interchangeable lens 3 is to be attached to the camera body 2 in the erroneous insertion position, the claw portions abut against each other at at least two locations, thereby reliably preventing erroneous insertion.

[0148] (2) In addition, in the first to fourth mis-insertion states, one of the two or more contact portions is located above the upper side of the imaging element 270. That is, in the mis-insertion position, one of the first to third lens-side claws 390a, 390c contacts the end of the first body-side claw 290a at the front end in the attachment direction 44, thereby preventing the first lens-side claw 390a, the third lens-side claw 390c, and the fourth lens-side claw 390d, other than the second lens-side claw 390b, from being inserted into the second body-side plug-in / out portion 280b.

[0149] (3) As described above, the body-side terminal holding portion 220 is disposed within the opening 212 of the body-side mounting member 210 and above the imaging element 270. The body-side first claw portion 290a is located above the body-side terminal holding portion 220. The first body-side claw portion 290a is the longest in the circumferential direction among the four body-side claw portions 290. Furthermore, the body-side second plug-in portion 280b is located above the body-side terminal holding portion 220. The second body-side plug-in portion 280b is the shortest among the four body-side plug-in portions 280.

[0150] Therefore, the second lens-side claw 390b can be inserted into the second body-side plug-in portion 280b only at the correct insertion position, and the other first to third lens-side claws 390a to 390c will not be mistakenly inserted into the second body-side plug-in portion 280b.

[0151] Furthermore, the first to third lens-side claws 390 a to 390 c also enter the second body-side insertion and removal portion 280 b without being tilted (tilted in a direction intersecting the optical axis O direction).

[0152] This prevents the lens-side claws 390 a to 390 c from colliding with the body-side terminal holding portion 220 and damaging the body-side terminals in an erroneously inserted state.

[0153] (4) In addition, although the first body side claw portion 290a is abutted against one of the lens side claw portions 390 in the erroneous insertion state to prevent erroneous insertion, since the first body side claw portion 290a has the longest circumferential length among the four body side claw portions 290 and has high rigidity, the possibility of damage to the first body side claw portion 290a in the event of erroneous insertion can also be reduced.

[0154] (5) Furthermore, in the second to fourth misinsertion states, at least one of the contact points is located at a position opposing the body-side terminal holding portion 220 across the optical axis O. Specifically, one of the contact points is located near the body-side terminal holding portion 220 and above the second body-side straight line B2 passing through the optical axis O, and one of the contact points is located below the second body-side straight line B2 passing through the optical axis O. Therefore, in the second to fourth misinsertion states, there are two or three contact points, but since the contact points are located above and below the second body-side straight line B2 passing through the optical axis O, the possibility of misinsertion can be reduced.

[0155] (6) Furthermore, in the first to fourth mis-insertion states, one of the two or more contact locations is located on the outer periphery of the lens-side terminal retaining portion 320. That is, in the mis-insertion position, one of the first to fourth body-side claws 290a to 290d contacts the end of the first lens-side claw 390a, which is located at the front end of the attachment direction 44. This prevents the other second to fourth body-side claws 290b to 290d from being mistakenly inserted into the second lens-side insertion and removal portion 380b. In other words, the lens-side terminal is protected.

[0156] (7) As described above, the end portion of the first body-side claw portion 290a, located at the front end in the attachment direction 44, is located above the lens-side terminal holding portion 320. This prevents the first lens-side claw portion 290a from colliding with the lens-side terminal holding portion 320 via the body-side plug-in / out portions 280b to 280d other than the first body-side plug-in / out portion 280a, thereby preventing the lens-side terminal from being damaged.

[0157] (8) In addition, although the first claw portion 390a on the lens side abuts against any of the claw portions 290 on the body side in the erroneous insertion state to prevent erroneous insertion, the first claw portion 390a on the lens side has the second longest circumferential length among the four lens side claw portions 390 and has a relatively high tolerance, thereby reducing the possibility of the first claw portion 390a on the lens side being damaged in the event of erroneous insertion.

[0158] (9) Here, Figure 8 As shown, the second claw portion 390b on the lens side is arranged in the insertion position through the second plug-in portion 280b on the body side, and is opposite to the second claw portion 290b on the body side in the attached position. Figure 6 ) is greater than the angle β2 of the second plug-in portion 280b on the body side ( Figure 3 The angle β2 of the second body-side plug-in / plug-out portion 280b is smaller than the first rotation angle from the insertion position to the attachment position.

[0159] Therefore, by making the second lens-side claw 390b smaller than the first rotation angle, the second body-side insertion portion 280b can be further reduced to prevent the lens-side claws 390 other than the second lens-side claw 390b from passing in the erroneous insertion state.

[0160] In particular, in the second to fourth incorrect insertion states in which the lens side claws 390 and the body side claws 290 abut at two or three locations, the lens side claws 390a, 390c, and 390d other than the second lens side claw 390b can be prevented from passing through the second body side plug-in portion 280b.

[0161] (10) Since the body side terminal holding portion 220 is arranged on the inner diameter side of the second plug-in portion 280b on the body side, by preventing the other lens side claws 390a, 390c, and 309d from passing through, it is also possible to prevent the other lens side claws 390 and the cylindrical portion 312 from colliding with the body side terminal holding portion 220 and causing damage to the body side terminal.

[0162] (11) Furthermore, the angle α6 of the second lens-side claw portion 390b may be smaller than the angles α5, α7, and α8 of the first lens-side claw portion 390a, the third lens-side claw portion 390c, and the fourth lens-side claw portion 390d. The angle β2 of the second body-side plug-in portion 280b may also be smaller than the angles α5, α7, and α8 of the first lens-side claw portion 390a, the third lens-side claw portion 390c, and the fourth lens-side claw portion 390d.

[0163] According to the above-described embodiment, the interchangeable lens 3 can be attached to the camera body 2 in a state suitable for use. In particular, when the interchangeable lens 3 is attached to the camera body 2, the four lens-side claws 390 are pressed in the +Z direction by the leaf springs 213 of the four body-side claws 290. Therefore, even if either the interchangeable lens 3 or the camera body 2 is subjected to an impact, the presence of four protrusions (the lens-side claws 390 and the body-side claws 290) provides high impact resistance.

[0164] Furthermore, when the interchangeable lens 3 is attached to the camera body 2 , communication, power supply, and control can be performed between the camera body 2 and the interchangeable lens 3 through their respective terminals, allowing the camera system 1 to be used appropriately.

[0165] The four protrusions of the interchangeable lens 3 are arranged on a straight line that intersects the optical axis O at approximately 45 degrees with respect to the straight line connecting the center of the contact holding portion and the optical axis O. They contact the four leaf springs 213 arranged at approximately 90-degree intervals around the optical axis O and face the four protrusions of the camera body 2. As a result, the camera system 1 has high impact resistance regardless of whether it is placed in a horizontal position (held horizontally) or in a vertical position. In particular, even if either the interchangeable lens 3 or the camera body 2 is subjected to an impact in the vertical direction, the straight line connecting the center of the contact holding portion and the optical axis O ( Figure 5 and Figure 7Since two protrusions are respectively arranged on the right and left sides of B1 and L1 shown, impacts in the vertical direction can be received by two or more protrusions.

[0166] Reference Figure 2 The second body-side claw 290b and the fourth body-side claw 290d are arranged on the third body-side straight line B3, and the first body-side claw 290a and the third body-side claw 290c are arranged on the fourth body-side straight line B4. Here, the angle α4 of the fourth body-side claw 290d is the third largest among the four body-side claws 290, and the angle α2 of the second body-side claw 290b is the smallest (fourth largest) among the four body-side claws 290. Furthermore, the angle α1 of the first body-side claw 290a is the largest among the four body-side claws 290, and the angle α3 of the third body-side claw 290c is the second largest among the four body-side claws.

[0167] Thus, when either the interchangeable lens 3 or the camera body 2 is subjected to a vertical impact, substantially equal forces are applied to the combination of the two upper protrusions (the first body-side claw 290a and the second body-side claw 290b) and the combination of the two lower protrusions (the fourth body-side claw 290d and the third body-side claw 290c). Even when subjected to a horizontal impact, substantially equal forces are applied to the combination of the two left protrusions (the third body-side claw 290c and the second body-side claw 290b) and the combination of the two right protrusions (the first body-side claw 290a and the fourth body-side claw 290d).

[0168] Reference Figure 5 The first lens-side claw 390a and the third lens-side claw 390c are arranged on the third lens-side straight line L3, and the second lens-side claw 390b and the fourth lens-side claw 390d are arranged on the fourth lens-side straight line L4. Here, the angle α8 of the fourth lens-side claw 390d is the third largest among the four lens-side claws 390, and the angle α6 of the second lens-side claw 390b is the smallest (fourth largest) among the four lens-side claws 390. Furthermore, the angle α5 of the first lens-side claw 390a is the second largest among the four lens-side claws, and the angle α7 of the third lens-side claw 390c is the largest among the four lens-side claws.

[0169] Thus, when either the interchangeable lens 3 or the camera body 2 is subjected to a vertical impact, substantially equal forces are applied to the combination of the two upper protrusions (the first lens-side claw 390a and the second lens-side claw 390b) and the combination of the two lower protrusions (the fourth lens-side claw 390d and the third lens-side claw 390c). Even when subjected to a horizontal impact, substantially equal forces are applied to the combination of the two left protrusions (the first lens-side claw 390a and the fourth lens-side claw 390d) and the combination of the two right protrusions (the third lens-side claw 390c and the second lens-side claw 390b).

[0170] Furthermore, in this embodiment, of the first and third lens-side claws 390a, 390c, located on the third lens-side straight line L3, the third lens-side claw 390c has a larger angle. Of the second and fourth lens-side claws 390b, 390d, located on the fourth lens-side straight line L4, the fourth lens-side claw 390d has a larger angle. Specifically, of the two lens-side claws 390 that face each other across the optical axis O, the two lens-side claws 390 located below the second lens-side straight line L2 (extending horizontally) are larger. Therefore, the two lens-side claws 390 located below the second lens-side straight line L2, with their larger angles, can absorb impacts from below when the interchangeable lens 3 is positioned in the horizontal direction, over a larger area. Furthermore, when the interchangeable lens 3 is subjected to a downward impact while the camera system is in the horizontal position, the lens-side claw 390 below the second lens-side straight line L2 is impacted in a direction (-Z direction) approaching the body-side claw 290. The leaf spring 213 then presses the lens-side claw 390 in a direction (+Z direction) away from the body-side claw 290. Therefore, even if the interchangeable lens 3 is subjected to a downward impact while the camera system is in the horizontal position, the lens-side claw 390 below the second lens-side straight line L2 can absorb the impact with its large area and the force of the leaf spring 213 against the body-side claw 290, resulting in high impact resistance.

[0171] When the interchangeable lens 3 is attached to the camera body 2, the lens-side terminal holder 320 is positioned above the imaging element 270. When the camera system 1 is placed in a horizontal position, sunlight incident on the interchangeable lens 3 is directed downward from the emission side of the interchangeable lens 3. This can easily cause ghosting below the imaging element 270. However, in this embodiment, the lens-side terminal holder 320 is positioned above the imaging element 270, rather than below it, to suppress ghosting.

[0172] The four leaf springs 213 are arranged at approximately 90-degree intervals around the optical axis O. Consequently, at least two of the four leaf springs 213, which sandwich the optical axis O, come into contact with the two lens-side claws 390, pressing the two lens-side claws 390 in the +Z direction. In this embodiment, the interchangeable lens 3 includes four lens-side claws 390. Even if one of the four lens-side claws 390 of the interchangeable lens 3 is damaged, at least two of the lens-side claws 390 are arranged in opposing positions sandwiching the optical axis O. Therefore, the two leaf springs 213 arranged in opposing positions sandwiching the optical axis O can still provide pressure. Therefore, even if the interchangeable lens 3 is damaged and the number of lens-side claws 390 is insufficient, a camera system 1 can be provided that allows the interchangeable lens 3 to be attached to the camera body 2 in a usable state.

[0173] In addition, since the leaf spring 213 is on the straight line B5 ( Figure 4 ), so the lens-side terminal near the straight line B5 can be strongly pressed toward the body-side terminal.

[0174] The following modifications are possible, and one or more modifications can be combined with the above-described embodiment.

[0175] (Variation)

[0176] Alternatively, one of the four lens-side claws 390 may be removed to provide a configuration with three lens-side claws. Even with three lens-side claws, since the leaf springs 213 of the camera body 2 are arranged at 90-degree intervals around the optical axis O, the lens-side claws can be pressed by at least three leaf springs 213, allowing the camera to be attached in a usable state.

[0177] Alternatively, the two lens-side claws 390 that face each other across the optical axis O may be eliminated, resulting in a configuration in which two lens-side claws face each other across the optical axis O. Even with two lens-side claws, since they face each other across the optical axis O and the leaf springs of the camera body 2 are arranged 90 degrees apart around the optical axis, the lens-side claws can be pressed by at least the leaf spring 213 that faces each other across the optical axis O, allowing the camera to be attached in a usable state. Furthermore, in a configuration in which two lens-side claws face each other across the optical axis O, one of the two lens-side claws is preferably positioned near the center of the lens-side terminal retaining portion 320. By positioning the lens-side claw near the center of the lens-side terminal retaining portion 320 and contacting the leaf spring 213, the lens-side terminal and the body-side terminal can be brought into contact, allowing for proper use of the camera system 1.

[0178] The material of the lens-side mounting member 310 is not particularly limited and may be metal or resin. Furthermore, at least a portion of the end portions of the lens-side mounting member 310 (such as the outer peripheral end portion of the lens-side claw portion 390, the circumferential end portion of the lens-side claw portion 390, and the end portion of the cylindrical portion 312 in the direction of the optical axis O) may be formed to be inclined. The end portions of the lens-side mounting member 310 may not be inclined or may have a partial step.

[0179] The shape of the lens-side terminal holding portion 320 is not particularly limited and can be modified as appropriate. In particular, by tilting the circumferential ends of the lens-side terminal holding portion 320, smooth contact with the body-side terminal holding portion 220 can be achieved when rotating from the insertion position to the attachment position.

[0180] Furthermore, although the lens-side terminal holding portion 320 includes a plurality of lens-side terminals arranged in an arc shape, the positions of the lens-side terminals may be shifted within a range of contact with the body-side terminals when the interchangeable lens 3 is attached to the camera body 2 .

[0181] The circumferential center position and length of the lens-side claw portion 390 can be appropriately changed within the range of pressure applied by the leaf spring 213 in the attached position. The circumferential center position of the lens-side claw portion 390 and the circumferential center position of the force-applied portion can also be located at different positions. In other words, the position where the lens-side claw portion 390 is pressed from the circumferential center position of the leaf spring 213 can be different from the circumferential center position of the lens-side claw portion 390. Similarly, the circumferential center position of the lens-side claw portion 390 and the circumferential center position of the body-side claw portion 290 can also be different in the attached position. Furthermore, the circumferential length of the lens-side claw portion 390 and the corresponding circumferential length of the body-side claw portion 290 can also be different.

[0182] Furthermore, while this embodiment illustrates the interchangeable lens 3 of the camera system 1 as an accessory, the accessory is not limited to the interchangeable lens 3. For example, a teleconverter, wide-angle converter, or close-up ring, which is attached between the camera body 2 and the interchangeable lens 3 to change the focal length of the interchangeable lens 3, may also be used. Alternatively, the present invention can be applied to a mount adapter, etc., that enables attachment of an interchangeable lens 3 to the aforementioned mounting specifications of the camera body 2, including accessories with other mounting specifications. In other words, any accessory can be used as long as it is attached to the camera body 2. In this case, the lens-side claws, lens-side terminals, etc., correspond to the accessory-side protrusions, accessory-side terminals, etc., of each accessory.

[0183] In the above embodiment, the accessory is configured to be attachable and detachable relative to the camera body 2, but the camera body 2 may be a mounting adapter that enables the interchangeable lens 3 of the above-mentioned assembly specifications to be attached to a camera body having specifications different from those of the above-mentioned assembly accessories, or may be a structure that enables the above-mentioned accessory to be attached to the mounting adapter.

[0184] Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other technical solutions that can be conceived within the scope of the technical concept of the present invention are also included in the scope of the present invention.

Claims

1. An accessory that is attachable to and detachable from a camera body having a body-side mounting member and a plurality of body-side terminals, the body-side mounting member having a first body-side protrusion, a second body-side protrusion, a third body-side protrusion, and a fourth body-side protrusion, the accessory comprising: The accessory side mounting part is annular in shape with the optical axis as the center and contacts the fuselage side mounting part; a cylindrical portion extending from an inner peripheral edge of the accessory-side mounting member along the optical axis; an accessory-side terminal group disposed inside the cylindrical portion and including a plurality of accessory-side terminals that come into contact with the plurality of body-side terminals when attached to the camera body; a first accessory-side protrusion protruding from the cylindrical portion toward the outer circumference of the accessory-side mounting member and extending in a circumferential direction centered on the optical axis; a second accessory-side protrusion protruding from the cylindrical portion toward the outer circumference of the accessory-side mounting member and extending in a circumferential direction centered on the optical axis; a third accessory-side protrusion, protruding from the cylindrical portion toward the outer circumference of the accessory-side mounting member and extending in a circumferential direction centered on the optical axis; as well as The fourth accessory side protrusion protrudes from the cylindrical portion toward the outer circumference of the accessory side mounting member and extends in a circumferential direction centered on the optical axis. The first accessory-side protrusion and the third accessory-side protrusion are arranged on a third accessory-side straight line that intersects the first accessory-side straight line at 45 degrees at the optical axis, and the first accessory-side straight line passes through the optical axis and the center of the terminal arranged at one end of the accessory-side terminal group and the terminal arranged at the other end of the accessory-side terminal group. The second accessory side protrusion and the fourth accessory side protrusion are arranged on an accessory side fourth straight line that is orthogonal to the accessory side third straight line at the optical axis. The first accessory side protrusion, the second accessory side protrusion, the third accessory side protrusion, and the fourth accessory side protrusion extend in the circumferential direction centered on the optical axis. At least one of the first, second, third, and fourth center angles is different from the other center angles, the first center angle being formed by a straight line connecting one circumferential end of the first accessory-side protrusion with the optical axis and a straight line connecting the other circumferential end of the first accessory-side protrusion with the optical axis, the second center angle being formed by a straight line connecting one circumferential end of the second accessory-side protrusion with the optical axis and a straight line connecting the other circumferential end of the second accessory-side protrusion with the optical axis, the third center angle being formed by a straight line connecting one circumferential end of the third accessory-side protrusion with the optical axis and a straight line connecting the other circumferential end of the third accessory-side protrusion with the optical axis, and the fourth center angle being formed by a straight line connecting one circumferential end of the fourth accessory-side protrusion with the optical axis and a straight line connecting the other circumferential end of the fourth accessory-side protrusion with the optical axis. A first accessory side insertion / removal portion corresponding to the fourth body side protrusion is disposed between the fourth accessory side protrusion and the first accessory side protrusion in the circumferential direction. A second accessory side insertion and removal portion corresponding to the first body side protrusion is arranged between the first accessory side protrusion and the second accessory side protrusion in the circumferential direction. A third accessory side insertion and removal portion corresponding to the second body side protrusion is arranged between the second accessory side protrusion and the third accessory side protrusion in the circumferential direction. A fourth accessory side insertion and removal portion corresponding to the third body side protrusion is arranged between the third accessory side protrusion and the fourth accessory side protrusion in the circumferential direction. The accessory is attached to the camera body by rotating in a first direction from an insertion position to an attachment position within a plane orthogonal to the optical axis at a predetermined position on the optical axis, the insertion position being a position where the fourth body-side protrusion, the first body-side protrusion, the second body-side protrusion, and the third body-side protrusion are inserted into the first accessory-side plug-in / extraction portion, the second accessory-side plug-in / extraction portion, the third accessory-side plug-in / extraction portion, and the fourth accessory-side plug-in / extraction portion, respectively, and the attachment position being a position where the first body-side protrusion, the second body-side protrusion, the third body-side protrusion, and the fourth body-side protrusion are opposed to the first accessory-side protrusion, the second accessory-side protrusion, the third accessory-side protrusion, and the fourth accessory-side protrusion, respectively. In a state where the first straight line is along the vertical direction and the accessory-side terminal group is located at the top, when viewing the accessory from the camera body, the first accessory-side protrusion is arranged on the upper left of the accessory-side terminal group, and the second accessory-side plug-in portion is arranged on the upper right of the accessory-side terminal group. The first direction is a direction in which the attachment is rotated so that the second attachment side insertion and removal portion is located forward and the first attachment side protrusion is located backward.

2. The accessory according to claim 1, The accessory is attached to the camera body by rotating in a first direction by a first angle within a plane substantially perpendicular to the optical axis at a predetermined position on the optical axis from an insertion position to an attachment position, the insertion position being a position where the first to fourth accessory-side protrusions, which protrude in the inner radial direction from the body-side attachment, are inserted between the corresponding plurality of body-side protrusions, and the attachment position being a position where the first to fourth accessory-side protrusions respectively oppose the corresponding body-side protrusions. At least one of the first center angle, the second center angle, the third center angle, and the fourth center angle is smaller than the first angle.

3. The accessory according to claim 1, The multiple accessory-side terminals of the accessory-side terminal group are in contact with the multiple body-side terminals, and the multiple body-side terminals are arranged in an arc shape on the upper part of the upper side of the shooting element for incident light of the subject, which is a rectangular shape with an upper side, a lower side, a right side and a left side and centered on the optical axis when the camera body is placed in a horizontal position.

4. The accessory according to any one of claims 1 to 3, The third center angle is greater than the first center angle, The first center angle is greater than the fourth center angle, The fourth center angle is greater than the second center angle.

5. The accessory according to any one of claims 1 to 3, The accessory is a replacement lens, The accessory further comprises any one of the following configurations (1) to (3), Configuration (1): the length of the second accessory side plug-in portion in the circumferential direction is longer than the length of the third accessory side plug-in portion in the circumferential direction; Configuration (2): Among the first accessory side plug-in / out portion, the second accessory side plug-in / out portion, the third accessory side plug-in / out portion, and the fourth accessory side plug-in / out portion, the second accessory side plug-in / out portion has the longest length in the circumferential direction; Configuration (3): the second accessory side plug-in portion intersects the first accessory side straight line, and the third accessory side plug-in portion intersects the second accessory side straight line that is orthogonal to the first accessory side straight line at the optical axis.

Images