Accessory

Abstract

To properly mount an accessory on a camera body so as to be available.SOLUTION: An accessory is detachable from a camera body which includes a body-side terminal group, a body-side mount arranged outside the body-side terminal group, and first, second, third and fourth body-side projections arranged in areas divided by a body-side first straight line and a body-side second straight line perpendicular to the body-side first straight line. The accessory includes: an accessory-side mount 310; a cylindrical part 312 of the accessory-side mount; an accessory-side terminal group 320; first and third accessory-side projections arranged on an accessory-side third straight line L3 which intersects at about 45 degree angle with an accessory-side first straight line L1; and second and fourth accessory-side projections arranged on an accessory-side fourth straight line L4 perpendicular to the accessory-side third straight line L3.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an accessory. [Background technology]

[0002] 2. Description of the Related Art There are known accessories that can be attached to and detached from a camera body (for example, see Patent Document 1). Conventionally, it has been necessary to attach the accessory to the camera body in a state in which the accessory can be used appropriately. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-43910 Summary of the Invention

[0004] An accessory according to a first aspect of the invention comprises an image sensor having a rectangular shape with upper and lower sides and right and left sides when a camera body is held in a horizontal position, and into which subject light is incident with its optical axis as its center; a body-side terminal group consisting of a plurality of body-side terminals arranged in an arc shape above the upper side of the image sensor; a body-side mount having an annular shape centered on the optical axis and arranged outside the image sensor and the body-side terminal group; a first body-side protrusion protruding inward from the body-side mount; and a second body-side protrusion protruding inward from the body-side mount. a third body-side protrusion protruding in an inward radial direction from the body-side mount, and a fourth body-side protrusion protruding in an inward radial direction from the body-side mount, wherein the first body-side protrusion, the second body-side protrusion, the third body-side protrusion, and the fourth body-side protrusion are respectively arranged in four regions divided by a body-side first straight line passing through a center of the body-side terminal group in the arc direction and the optical axis, and a body-side second straight line perpendicular to the body-side first straight line and the optical axis, a cylindrical portion extending from an inner peripheral edge of the accessory side mount in the optical axis direction; an accessory side terminal group consisting of a plurality of accessory side terminals arranged inside the cylindrical portion and contacting the body side terminals when the accessory side mount is attached to the camera body; a first accessory side protrusion protruding from the cylindrical portion toward the outer periphery of the accessory side mount and extending in a circumferential direction centered on the optical axis; a second accessory side protrusion extending from the cylindrical portion toward the outer periphery of the accessory side mount and extending in a circumferential direction centered on the optical axis, and a fourth accessory side protrusion protruding from the cylindrical portion toward the outer periphery of the accessory side mount and extending in a circumferential direction centered on the optical axis, wherein the first accessory side protrusion and the third accessory side protrusion are disposed on an accessory side third straight line that intersects with a center of the accessory side terminal group and the optical axis at approximately 45 degrees on the optical axis,The second accessory side protrusion and the fourth accessory side protrusion are disposed on an accessory side fourth straight line perpendicular to the accessory side third straight line by the optical axis. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a cross-sectional view illustrating a schematic configuration of a camera system. [Diagram 2] FIG. 2 is a front view of the mount surface of the camera body as viewed from the interchangeable lens side. [Diagram 3] FIG. 2 is a front view of the mount surface of the camera body as viewed from the interchangeable lens side. [Figure 4] FIG. 4 is a front view of the leaf spring in the body side mount. [Diagram 5] FIG. 2 is a front view of the mount surface of the interchangeable lens as seen from the camera body side. [Figure 6] FIG. 2 is a front view of the mount surface of the interchangeable lens as seen from the camera body side. [Figure 7] FIG. 2 is a perspective view of a mount surface of an interchangeable lens. [Figure 8] FIG. 2 is a front view of the body side claw portion and the lens side claw portion in the insertion position as viewed from the interchangeable lens side. [Figure 9] FIG. 2 is a front view of the body side claw portion and the lens side claw portion in the attached position, as seen from the interchangeable lens side. [Figure 10] 13A and 13B are a front view and a side view of the body side claw portion and the lens side claw portion in an over-rotated state in the mounting direction, as viewed from the interchangeable lens side. [Figure 11] FIG. 13 is a side view of the body side claw portion and the lens side claw portion in an over-rotated state in the removal direction, as viewed from the interchangeable lens side. [Figure 12] FIG. 2 is a front view of the body claw portion and the lens claw portion in a first erroneous insertion state, as viewed from the interchangeable lens side. [Figure 13] 13A to 13C are front views of the body side claw portion and the lens side claw portion in the second erroneous insertion state, the third erroneous insertion state, and the fourth erroneous insertion state, as viewed from the interchangeable lens side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] 1 is a cross-sectional view showing an outline of the configuration of a camera system 1 according to an embodiment of the invention. The camera system 1 includes a camera body 2 and an interchangeable lens 3 as an example of an accessory that can be attached to and detached from the camera body 2. Examples of other accessories that can be attached to and detached from the camera body 2 include a mount adapter, a teleconverter, a wide converter, etc.

[0007] The interchangeable lens 3 has a lens mount 310, a lens terminal holding section 320, a lens CPU 330, a lens communication section 340, a lens storage section 350, an imaging optical system 360, and a drive section 370. The lens mount 310 and the lens terminal holding section 320 will be described in detail later.

[0008] The lens side CPU 330 is composed of a microcomputer and its peripheral circuits, etc. 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 CPU 330 and a lens side terminal (described later) provided on the lens side terminal holding unit 320. 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 stores in advance 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 the programs.

[0009] The imaging optical system 360 forms a subject image on the imaging surface of the imaging element 270, which will be 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, which will be described later. The imaging optical system 360 in FIG. 1 generally includes a lens 361, a focusing lens 362, and a lens 363. The focusing lens 362 is a lens that adjusts the imaging position of the subject image. The driving unit 370 is connected to the lens side CPU 330, and has an actuator (not shown) and the like. The driving unit 370 moves the focusing lens 362 forward and backward in the direction of the optical axis O (+Z, -Z direction) by using the actuator and the like.

[0010] The camera body 2 has a body side mount 210, a body side terminal holding section 220, a body side CPU 230, a body side communication section 240, a body side storage section 250, a power supply section 260, and an image sensor 270. The body side mount 210 and the body side terminal holding section 220 will be described in detail later.

[0011] The body side CPU 230 is composed of a microcomputer and its peripheral circuits. The body side CPU 230 performs various controls of the body. The body side communication unit 240 performs predetermined data communication with the interchangeable lens 3. The body side communication unit 240 is connected to the body side CPU 230 and a plurality of body side terminals (described later) provided on the body side terminal holding unit 220.

[0012] The body side storage unit 250 is a non-volatile storage medium. The body side storage unit 250 is connected to the body side CPU 230. Predetermined control programs and the like to be executed by the body side CPU 230 are stored in advance in the body side storage unit 250. The body side CPU 230 controls the camera body 2 by reading the control programs from the body side storage unit 250 and executing the programs.

[0013] The power supply unit 260 has a power source and supplies power to the inside of the camera body 2 and the interchangeable lens 3. The power supply unit 260 is connected to a body side terminal (described later) provided on the body side terminal holding unit 220 and the body side CPU 230. The image sensor 270 is, for example, a solid-state image sensor such as a CCD or CMOS. The image sensor 270 is connected to the body side CPU 230, captures an image of a subject, and outputs an image signal. A description of the processing of the output image signal will be omitted.

[0014] (Explanation of lens mount mechanism) The camera system 1 of this embodiment is equipped with a so-called bayonet-type lens mount mechanism. Below, the body side mount 210 of the camera body 2 and the lens side mount 310 of the interchangeable lens 3 will be described in order.

[0015] (Body side mount 210) 2 and 3 are diagrams showing a schematic view of the mount of the camera body 2 as seen from the interchangeable lens 3 side. FIGS. 2 and 3 show the state in which the camera body 2 is held in the horizontal position. As shown in FIG. 2, the rectangular imaging element 270 is horizontally long, i.e., the long sides are the upper and lower sides, and the short sides are the right and left sides, when the camera body 2 is held in the horizontal position. A first body-side straight line B1 extending in the vertical direction Y of the camera body 2, shown by a solid line in FIG. 2, is the up-down direction as seen by the photographer using the camera system 1 when the photographer holds the camera body 2 in the horizontal position. A second body-side straight line B2 extending in the horizontal direction X of the camera body 2, shown by a solid line in FIG. 2, is the left-right direction as seen by the photographer using the camera system 1 when the photographer holds the camera body 2 in the horizontal position.

[0016] The body-side first straight line B1 and the body-side second straight line B2 are perpendicular to each other on the optical axis O (center). As shown by the dashed lines in Fig. 2, the lines extending in a direction intersecting the body-side first straight line B1 and the body-side second straight line B2 at 45 degrees on the optical axis O of the image sensor 270 are defined as the body-side third straight line B3 and the body-side fourth straight line B4.

[0017] The mount of the camera body 2 includes the body side mount 210 and the body side terminal holding portion 220 described above in Fig. 1. The body side mount 210 has an annular reference surface 211 that has a certain width and is disposed along a plane perpendicular to the optical axis O. The body side mount 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. In the following description, these four protruding portions, that is, the first body claw portion 290a to the fourth body claw portion 290d, will be collectively referred to as the body claw portions 290.

[0018] The body side claws 290 are arranged at intervals from each other along the circular opening 212 of the body side mount 210. As shown in Fig. 2, the first body side claw 290a is arranged at the upper right position, the second body side claw 290b is arranged at the upper left position, the third body side claw 290c is arranged at the lower left position, and the fourth body side claw 290d is arranged at the lower right position. The body side first claw portion 290a is arranged in the area above the body side second straight line B2 and to the right of the body side first straight line B1, the body side second claw portion 290b is arranged in the area above the body side second straight line B2 and to the left of the body side first straight line B1, the body side third claw portion 290c is arranged in the area below the body side second straight line B2 and to the left of the body side first straight line B1, and the body side fourth claw portion 290d is arranged in the area below the body side second straight line B2 and to the right of the body side first straight line B1.

[0019] The body side first claw portion 290a and the body side third claw portion 290c are each disposed on the body side fourth straight line B4 in a region that is approximately symmetrical about the optical axis O. The body side second claw portion 290b and the body side fourth claw portion 290d are each disposed on the body side third straight line B3 in a region that is approximately symmetrical about the optical axis O. As shown in FIG. 2, the central positions of the first body side claw portion 290a to the fourth body side claw portion 290d in the circumferential direction do not overlap with the third body side straight line B3 and the fourth body side straight line B4.

[0020] 3, the circumferential lengths of the first body side claw portion 290a to the fourth body side claw portion 290d are different from one another. Specifically, the first body side claw portion 290a is the longest, the third body side claw portion 290c is the second longest, the fourth body side claw portion 290d is the third longest, and the second body side claw portion 290b is the shortest. The angle α1 between a straight line connecting one end of the body side first claw portion 290a and the optical axis O and a straight line connecting the other end of the body side first claw portion 290a and the optical axis O is approximately 47 degrees, and is between 46.5 degrees and 47.5 degrees. The angle α3 between a straight line connecting one end of the body side third claw portion 290c to the optical axis O and a straight line connecting the other end of the body side third claw portion 290c to the optical axis O is approximately 42.5 degrees, and is between 42.0 degrees and 43.0 degrees.

[0021] The angle α4 between a straight line connecting one end of the body side fourth claw portion 290d and the optical axis O and a straight line connecting the other end of the body side fourth claw portion 290d and the optical axis O is approximately 42 degrees, and is between 41.5 degrees and 42.5 degrees. The angle α2 between a straight line connecting one end of the body side second claw portion 290b and the optical axis O and a straight line connecting the other end of the body side second claw portion 290b and the optical axis O is approximately 40 degrees, and is between 40.0 degrees and 41.0 degrees. The first body side claw portion 290a to the fourth body side claw portion 290d each have the same radial length (claw portion height) and the same length in the optical axis O direction (claw portion thickness).

[0022] The body side claw portion 290 protrudes from the opening 212 of the body side mount 210 toward the optical axis O (the center of the image sensor 270), and on the circumference of the opening 212 there are portions where the body side claw portion 290 is present and portions where the body side claw portion 290 is not present. In the following description, the space 280a between the body side first claw portion 290a and the body side fourth claw portion 290d on the circumference of the opening 212 of the body side mount 210 is referred to as the body side first insertion / removal portion 280a.

[0023] Similarly, the space 280b between the body side first claw 290a and the body side first claw 290b is referred to as the body side second insertion / removal portion 280b, the space 280c between the body side second claw 290b and the body side third claw 290c is referred to as the body side third insertion / removal portion 280c, and the space 280d between the body side third claw 290c and the body side fourth claw 290d is referred to as the body side fourth insertion / removal portion 280d. These four spaces, the body side first insertion / removal portion 280a to the fourth insertion / removal portion 280d, are collectively referred to as the body side insertion / removal portion 280.

[0024] The circumferential lengths of the first body side insertion / removal portion 280a to the fourth body side insertion / removal portion 280d are different from one another. Specifically, the third body side insertion / removal portion 280c is the longest, the first body side insertion / removal portion 280a is the second longest, the fourth body side insertion / removal portion 280d is the third longest, and the second body side insertion / removal portion 280b is the shortest. The angle β3 between a line connecting one end of the body side third insertion portion 280c and the optical axis O and a line connecting the other end of the body side third insertion portion 280c and the optical axis O is approximately 51 degrees and is between 51.0 degrees and 52.0 degrees. The angle β1 between a straight line connecting one end of the body side first insertion / removal portion 280a and the optical axis O and a straight line connecting the other end of the body side first insertion / removal portion 280a and the optical axis O is approximately 50 degrees, and is between 50.0 degrees and 51.0 degrees.

[0025] The angle β4 between a line connecting one end of the body side fourth insertion portion 280d and the optical axis O and a line connecting the other end of the body side fourth insertion portion 280d and the optical axis O is approximately 46 degrees, and is between 45.5 degrees and 46.5 degrees. The angle β2 between a straight line connecting one end of the body side second insertion portion 280b and the optical axis O and a straight line connecting the other end of the body side second insertion portion 280b and the optical axis O is approximately 39 degrees, and is between 39.0 degrees and 40.0 degrees. Of course, the sum of the angles α1 to α4 of the four body side first claw portions 290a to 290d and the angles β1 to β4 of the four body side first insertion / removal portions 280a to 280d is 360 degrees.

[0026] The body side first insertion / removal portion 280a is arranged in the area above the body side third straight line B3 and below the body side fourth straight line B4, the body side second insertion / removal portion 280b is arranged in the area above the body side third straight line B3 and above the body side fourth straight line B4, the body side third insertion / removal portion 280c is arranged in the area below the body side third straight line B3 and above the body side fourth straight line B4, and the body side fourth insertion / removal portion 280d is arranged in the area below the body side third straight line B3 and below the body side fourth straight line B4.

[0027] The body side first insertion / removal portion 280a and the body side third insertion / removal portion 280c are each disposed on the body side second straight line B2 in a region that is approximately symmetrical about the optical axis O. The body side second insertion / removal portion 280b and the body side fourth insertion / removal portion 280d are each disposed on the body side first straight line B1 in a region that is approximately symmetrical about the optical axis O. As shown in FIG. 2, the central positions along the circumferential direction of each of the first body side insertion portion 280a to the fourth body side insertion portion 280d do not overlap with the first body side straight line and the second body side straight line B2.

[0028] A body side terminal holding portion 220 consisting of a plurality of body side terminals is provided inside the opening 212 of the body side mount 210. The body side terminal holding portion 220 has an arc shape corresponding to the shape of the annular body side mount 210. The body side terminal holding portion 220 is disposed on the inner periphery side of the opening 212 of the body side mount 210 and above the image sensor 270, and is preferably disposed in the center of the upper part of the image sensor 270 as shown in Figures 2 and 3. In other words, the center in the circumferential direction of the body side terminal holding portion 220 is preferably located on the body side first straight line B1.

[0029] The body side first claw portion 290a is disposed at the upper right of the body side terminal holding portion 220, and the body side second insertion / removal portion 280b is disposed at the upper left of the body side terminal holding portion 220. Therefore, the angle between a line connecting one end of the body side terminal holding portion 220 and the optical axis O and a line connecting the other end of the body side terminal holding portion 220 and the optical axis O is smaller than the combined angle α1 of the body side first claw portion 290a and the angle β2 of the body side second insertion / removal portion 280b.

[0030] The body side terminal holding portion 220 has a plurality of body side terminals as described above. The plurality of body side terminals (referred to as a body side terminal group) are arranged in an arc shape above the upper side of the upper edge of the image sensor 270. Each of the body side terminal group is a conductive pin. The body side terminal group is pressed in the -Z direction (FIG. 1) by a spring (not shown) or the like. Here, the -Z direction is the direction from the camera body 2 toward the interchangeable lens 3, that is, the direction toward the subject. The +Z direction is the direction from the interchangeable lens 3 toward the camera body 2, that is, the direction toward the image sensor 270.

[0031] The body side mount 210 has a hole through which the lock pin 214 passes. The hole through which the lock pin 214 passes is located at the upper right of the body side fourth claw portion 290d. That is, on the annular reference surface 211 of the body side mount 210, the hole of the lock pin 214 is located between the area where the body side fourth claw portion 290d exists and the area where the body side first claw portion 290a exists. The lock pin 214 is pressed in the -Z direction (toward the subject) by a spring or the like (not shown). The lock pin 214 can be moved in the +Z direction (toward the image sensor 270) against the biasing force of the spring by pressing a lock release button (not shown).

[0032] 4 is a schematic diagram of the mount of the camera body 2 with the body side mount 210 removed, viewed from the interchangeable lens 3 side. A first leaf spring 213a is provided at a position corresponding to the first body side claw portion 290a (behind the first body side claw portion 290a). Similarly, a second leaf spring 213b is provided at a position corresponding to the second body side claw portion 290b (on the rear 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 (on the rear 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 (on the rear side of the fourth body side claw portion 290d). In the following description, these four first leaf spring 213a to fourth leaf spring 213d are collectively referred to as leaf spring 213. The leaf spring 213 is disposed on the surface of the body side claw portion 290 on the imaging element 270 side, and presses the subject side surface of the opposing lens side claw portion (described later) 390 toward the imaging element 270 side (+Z direction).

[0033] 4, the rear end of the body side terminal holding portion 220 in the mounting direction 44 is located near a straight line B5 connecting the optical axis O and the rear end of the first leaf spring 213a in the mounting direction 44 (described later). The second leaf spring 213b, the third leaf spring 213c, and the fourth leaf spring 213d are located at approximately 90 degree intervals around the optical axis O with the first leaf spring 213a as a starting point.

[0034] (Lens side mount 310) 5 and 6 are diagrams showing a schematic view of the mount of the interchangeable lens 3 as viewed from the camera body 2 side (as viewed from behind the interchangeable lens 3). A first lens-side straight line L1 extending in the vertical direction Y of the interchangeable lens 3, shown by a solid line in Fig. 5, is the up-down direction as seen by a photographer using the camera system 1 when the photographer holds the camera body 2 in a horizontal position. Moreover, a second lens-side straight line L2 extending in the horizontal direction X of the interchangeable lens 3, shown by a solid line in Fig. 5, is the left-right direction as seen by a photographer using the camera system 1 when the photographer holds the camera body 2 in a horizontal position.

[0035] The lens-side first straight line L1 and the lens-side second straight line L2 are perpendicular to each other on the optical axis O (center) of the interchangeable lens 3. As shown by the dashed line in FIG. 5, the lines extending in a direction intersecting the lens-side first straight line L1 and the lens-side second straight line L2 at 45 degrees on the optical axis O are the lens-side third straight line L3 and the lens-side fourth straight line L4. When the interchangeable lens 3 is attached to the camera body 2 in a usable state, the body-side first straight line B1 and the lens-side first straight line L1 coincide with each other, the body-side second straight line B2 and the lens-side second straight line L2 coincide with each other, the body-side third straight line B3 and the lens-side fourth straight line L4 coincide with each other, and the body-side fourth straight line B4 and the lens-side third straight line L3 coincide with each other. Note that the straight lines do not have to coincide completely with each other, and there may be a deviation within a range in which the interchangeable lens 3 can be attached to the camera body 2 in a usable state.

[0036] The mount of the interchangeable lens 3 includes the lens side mount 310 and the lens side terminal holding part 320 described above in FIG. 1. The lens side mount 310 is formed in an annular shape 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 annular in shape 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 optical axis O direction, a lock pin sliding surface 309 on which a lock pin 214 described later slides while being attached is formed in a concave shape toward the -Z direction on a cross section along the Z direction. The lock pin sliding surface 309 is annular in shape centered on the optical axis O, and is arranged along a plane perpendicular to the optical axis O.

[0037] The lens side mount 310 is fixed to a fixing member arranged inside the interchangeable lens 3 by screwing it with screws 313. When the lens side mount 310 is viewed from the camera body 2 side, the screws 313 are arranged at approximately 90 degree intervals around the optical axis O. In addition, the four screws 313 are respectively arranged on the outer periphery of four lens side claw portions 390 described below. In addition, the screws 313 are arranged on the outer periphery of both ends of the lens side terminal holding portion 320 in the circumferential direction.

[0038] The lens side mount 310 has a cylindrical portion 312 extending in the direction of the optical axis O from its inner peripheral edge (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 direction of the optical axis O is positioned in a direction that protrudes toward the camera body 2 beyond the reference surface 311. The lens side mount 310 has a first lens side claw portion 390a, a second lens side claw portion 390b, a third lens side claw portion 390c, and a fourth lens side claw portion 390d spaced apart from one another along the outer periphery of the rear end portion in the direction of the optical axis O of the cylindrical portion 312. In the following description, these four protrusions, that is, the first lens claw portion 390a to the fourth lens claw portion 390d, will be collectively referred to as the lens claw portion 390.

[0039] The lens side claw portion 390 is provided in a direction protruding from the outer circumferential edge portion of the cylindrical portion 312 of the lens side mount 310 toward the outer periphery of the lens side mount 310, and is approximately perpendicular to the optical axis O. The lens side claw portion 390 extends in a circumferential direction centered on the optical axis O. As shown in Fig. 5 and Fig. 6, the lens side first claw portion 390a is located at the upper left position, the lens side second claw portion 390b is located at the upper right position, the lens side third claw portion 390c is located at the lower right position, and the lens side fourth claw portion 390d is located at the lower left position. In other words, the lens side first claw portion 390a is positioned in the area above the lens side second straight line L2 and to the left of the lens side first straight line L1, the lens side second claw portion 390b is positioned in the area above the lens side second straight line L2 and to the right of the lens side first straight line L1, the lens side third claw portion 390c is positioned in the area below the lens side second straight line L2 and to the right of the lens side first straight line L1, and the lens side fourth claw portion 390d is positioned in the area below the lens side second straight line L2 and to the left of the lens side first straight line L1.

[0040] In addition, the lens side first claw portion 390a and the lens side third claw portion 390c are arranged on the lens side third straight line L3 in a region that is approximately symmetrical about the optical axis O, and the lens side second claw portion 390b and the lens side fourth claw portion 390d are arranged on the lens side fourth straight line L4 in a region that is approximately symmetrical about the optical axis O. It should be noted that the lens side third straight line L3 and the lens side fourth straight line L4 do not necessarily pass through the central positions in the circumferential direction of each of the lens side first claw portion 390a to the lens side fourth claw portion 390d.

[0041] When the interchangeable lens 3 is attached to the camera body 2, the body side claw 290 is disposed between the lens side mount 310 and the lens side claw 390 in the direction of the optical axis O. At this time, the lens side first claw 390a contacts the leaf spring 213a of the body side first claw 290a, the lens side second claw 390b contacts the leaf spring 213b of the body side second claw 290b, the lens side third claw 390c contacts the leaf spring 213c of the body side third claw 290c, and the lens side fourth claw 390d contacts the leaf spring 213d of the body side fourth claw 290d.

[0042] The lens side claw 390 has a biased portion as a contact portion that is brought into contact with the leaf spring 213 and biased in a direction away from the body side claw 290. The shape of the biased portion may be any shape as long as the lens side claw 390 can receive a sufficient biasing force from the leaf spring 213, and the contact between the leaf spring 213 and the biased portion may be any of point contact, line contact, and surface contact. The shape and material of the leaf spring 213 may be changed as appropriate as long as it can sufficiently press the lens side claw 390.

[0043] When the leaf spring 213 of the body side claw 290 and the lens side claw 390 come into contact with each other, the lens side claw 390 is pressed by the leaf spring 213 in a direction (+Z direction) away from the body side claw 290 along the optical axis O. By pressing the lens side claw 390 in the +Z direction (towards the image sensor 270), the lens side mount 310 is pressed towards the body side mount 210, and the attachment of the interchangeable lens 3 to the camera body 2 is stabilized.

[0044] It should be noted that the lens side claw portion 390 and the body side claw portion 290 do not need to have the same circumferential length, and the circumferential length of the lens side claw portion 390 can be changed within a range that can be pressed by the leaf spring 213. 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, and 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. Furthermore, the lens side claw portion 390 and the body side insertion / removal portion 280 do not need to have approximately the same circumferential length; it is sufficient that the circumferential length of the lens side claw portion 390 to be inserted is equal to or less than the circumferential length of the body side insertion / removal portion 280. Similarly, the circumferential lengths of the body side claw portion 290 and the lens side insertion / removal portion 380 do not need to be the same; it is sufficient that the circumferential length of the body side claw portion 290 to be inserted is equal to or less than the circumferential length of the lens side insertion / removal portion 380.

[0045] 6, the lens side first claw portion 390a to the lens side fourth claw portion 390d have different circumferential lengths. Also, the angle between a line connecting one end of the lens side first claw portion 390a to the lens side fourth claw portion 390d in the circumferential direction and the optical axis O and a line connecting the other end of the lens side first claw portion 390a to the lens side fourth claw portion 390d in the circumferential direction and the optical axis O is different. Specifically, the lens side third claw portion 390c is the longest, the lens side first claw portion 390a is the second longest, the lens side fourth claw portion 390d is the third longest, and the lens side second claw portion 390b is the shortest. The angle α7 between a straight line connecting one end of the lens side third claw portion 390c to the optical axis O and a straight line connecting the other end of the lens side third claw portion 390c to the optical axis O is approximately 48.5 degrees, and is between 48.0 degrees and 49.0 degrees. The angle α5 between a straight line connecting one end of the lens side first claw portion 390a to the optical axis O and a straight line connecting the other end of the lens side first claw portion 390a to the optical axis O is approximately 48 degrees, and is between 47.5 degrees and 48.5 degrees.

[0046] The angle α8 between a straight line connecting one end of the lens side fourth claw portion 390d to the optical axis O and a straight line connecting the other end of the lens side fourth claw portion 390d to the optical axis O is approximately 44 degrees, and is between 43.0 degrees and 45.0 degrees. The angle α6 between a straight line connecting one end of the lens side second claw portion 390b and the optical axis O and a straight line connecting the other end of the lens side second claw portion 390b and the optical axis O is approximately 36 degrees, and is between 35.5 degrees and 36.5 degrees. The angle α6 between a line connecting one end of the lens side second claw 390b and the optical axis O and a line connecting the other end of the lens side second claw 390b and the optical axis O is smaller than the rotation angle described below.

[0047] The lens side first claw portion 390a to the lens side fourth claw portion 390d have substantially the same radial length (claw portion height) and substantially the same length in the optical axis O direction (claw portion thickness).

[0048] At least one of the lens-side claws 390 may be partially cut out as long as it does not affect the mounting state of the lens-side claw 390 with the camera body 2. Even if a part of the lens-side first claw 390a is cut out, the whole including the protruding part and the cut out part arranged in the area facing the body-side first claw 290a is the lens-side first claw 390a. The same is true for the other lens-side second to fourth claws 390b to 390d. As for the method of cutting out, the lens-side first claw 390a may be cut out so as to divide the lens-side first claw 390a into two or more in the circumferential direction, or may be cut out so as to cut out a part of the lens-side first claw 390a, or may be cut out so as to shorten the radial length of at least a part of the lens-side first claw 390a. Therefore, the lens-side claw 390 may be cut out in a part on the lens-side third straight line L3 or the lens-side fourth straight line L4. The circumferential length of the lens side first claw portion 390a may be changed within a range that passes through the corresponding body side first insertion / removal portion 280a during insertion. The same applies to the lens side second claw portion 390b, the lens side third claw portion 390c, and the lens side fourth claw portion 390d. Furthermore, the radial thickness of the cylindrical portion 312 can be changed as appropriate, and at least a portion of the cylindrical portion 312 in this embodiment may protrude radially inward.

[0049] The lens side claw portion 390 protrudes radially outward from the outer periphery of the cylindrical portion 312, and there are portions on the outer periphery of the cylindrical portion 312 where the lens side claw portion 390 is present and spaces where the lens side claw portion 390 is not present.

[0050] In the following description, a space 380d between the first lens side claw portion 390a and the fourth lens side claw portion 390d on the outer periphery of the cylindrical portion 312 is referred to as a first lens side insertion / removal portion 380a. Similarly, space 380b between lens side first claw portion 390a and lens side second claw portion 390b is referred to as lens side second insertion / removal portion 380b, space 380c between lens side second claw portion 390b and lens side third claw portion 390c is referred to as lens side third insertion / removal portion 380c, and space 380d between lens side third claw portion 390c and lens side fourth claw portion 390d is referred to as lens side fourth insertion / removal portion 380d. These four lens side first insertion portion 380a to fourth insertion portion 380d are collectively referred to as lens side insertion portion 380.

[0051] The circumferential lengths of the first lens side portion 380a to the fourth lens side portion 380d are different from one another. Specifically, the second lens side portion 380b is the longest, the first lens side portion 380a is the second longest, the fourth lens side portion 380d is the third longest, and the third lens side portion 380c is the shortest. The angle β6 between a straight line connecting one end of the lens side second insertion portion 380b and the optical axis O and a straight line connecting the other end of the lens side second insertion portion 380b and the optical axis O is approximately 50 degrees, and is between 49.5 degrees and 50.5 degrees. The angle β5 between a straight line connecting one end of the lens side first insertion portion 380a and the optical axis O and a straight line connecting the other end of the lens side first insertion portion 380a and the optical axis O is approximately 45 degrees, and is between 44.5 degrees and 45.5 degrees.

[0052] The angle β8 between a line connecting one end of the lens side fourth insertion portion 380d and the optical axis O and a line connecting the other end of the lens side fourth insertion portion 380b and the optical axis O is approximately 44.5 degrees, and is between 44.0 degrees and 45.0 degrees. The angle β7 between a line connecting one end of the lens side third insertion portion 380c and the optical axis O and a line connecting the other end of the lens side third insertion portion 380c and the optical axis O is approximately 44 degrees. It is between 43.5 degrees and 44.5 degrees. Of course, the sum of the angles α5 to α8 of the four lens side first claw portions 390a to 390d and the angles β5 to β8 of the four lens side first insertion / removal portions 380a to 380d is 360 degrees.

[0053] In addition, the lens side first insertion / removal portion 380a and the lens side third insertion / removal portion 380c are arranged on the lens side second straight line L2 in a region that is approximately symmetrical about the optical axis O, and the lens side second insertion / removal portion 380b and the lens side fourth insertion / removal portion 380d are arranged on the lens side first straight line L1 in a region that is approximately symmetrical about the optical axis O. It should be noted that the lens side first straight line L1 and the lens side second straight line L2 do not necessarily pass through the center positions along the circumferential direction of the lens side first to fourth insertion / removal portions 380a to 380d.

[0054] A lens side terminal holding part 320 consisting of a plurality of lens side terminals is provided inside the cylindrical part 312. The lens side terminal holding part 320 has an arc shape corresponding to the shape of the annular lens side mount 310. The lens side terminal holding part 320 is arranged on the upper part of the lens side mount 310 in parallel with the opening of the lens side mount 310, and is preferably arranged in the center of the upper part as shown in Figures 5 and 6. In other words, the center in the circumferential direction of the lens side terminal holding part 320 is preferably located on the lens side first straight line L1.

[0055] The lens side first claw portion 390a is disposed at the upper left of the lens side terminal holding portion 320, and the lens side second insertion / removal portion 380b is disposed at the upper right of the lens side terminal holding portion 320. Therefore, the angle between a line connecting one end of the lens side terminal holding portion 320 and the optical axis O and a line connecting the other end of the lens side terminal holding portion 320 and the optical axis O is smaller than the combined angle α5 of the lens side first claw portion 390a and the angle β6 of the lens side second insertion / removal portion 380b.

[0056] As described above, the lens side terminal holding section 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 line in an arc shape on the lens side terminal holding section 320 inside the lens side mount 310. The lens side terminal group is arranged such that the conductive contact surface is exposed toward the +Z direction (FIG. 1).

[0057] All of the contact surfaces of the multiple lens side terminals may be located in the +Z direction from the rear end of the lens side claw 390 in the optical axis O direction, or may be located in the -Z direction from the rear end of the lens side claw 390 in the optical axis O direction. In addition, some of the contact surfaces of the multiple lens side terminals may be located in the +Z direction from the rear end of the lens side claw portion 390 in the direction of the optical axis O, and the remaining contact surfaces may be located in the -Z direction from the rear end of the lens side claw portion 390 in the direction of the optical axis O.

[0058] The lens side mount 310 has a lock pin receiving portion 314. As shown in Figures 5 and 6, the lock pin receiving portion 314 is located at the upper left of the lens side fourth claw portion 390d. In other words, the lock pin receiving portion 314 is located between a portion of the lock pin sliding surface 309 of the lens side mount 310 that corresponds to the outer circumferential side of the lens side first claw portion 390a and a portion that corresponds to the outer circumferential side of the lens side fourth claw portion 390d.

[0059] The lock pin receiving portion 314 is a groove into which the lock pin 214 of the camera body 2 fits when the interchangeable lens 3 is attached to the camera body 2. This groove is provided in a concave shape from the lock pin sliding surface 309 of the lens side mount 310 toward the -Z direction (FIG. 1). When the unlock button on the camera body 2 is not pressed, the -Z end (the front end on the subject side) of the lock pin 214 fits into 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 end of the lock pin 214 is located in the +Z direction from 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 lock release button on the camera body 2 is pressed, the lock pin 214 does not come into contact with the lock pin sliding surface 309.

[0060] When the interchangeable lens 3 is attached to the camera body 2, the multiple body side terminals come into physical contact with the multiple corresponding lens side terminals. This contact electrically connects the multiple body side terminals and the multiple lens side terminals. In other words, the multiple body side terminals and the multiple lens side terminals are electrically connected to each other.

[0061] 7, a limiting pin 315 is disposed between the reference surface 311 of the lens side mount 310 and the lens side fourth claw portion 390d in a direction protruding from the outer circumferential surface of the cylindrical portion 312. The limiting pin 315 is disposed on the rear end side (position close to the lens side third claw portion 390c) of the lens side fourth claw portion 390d in the mounting direction 44. A part of the limiting pin 315 is disposed on the back side of the lens side fourth claw portion 390d when the lens side fourth claw portion 390d is viewed from behind the interchangeable lens 3. In this embodiment, the limiting pin 315 is screwed to the cylindrical portion 312 from the outside in the radial direction using a screw member, but the shape and material of the limiting pin 315 are not limited to this.

[0062] (How to attach interchangeable lens 3 to camera body 2) Next, a method of mounting the interchangeable lens 3 on the camera body 2 will be described with reference to Figures 8 and 9. Figures 8 and 9 are diagrams 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, and show the abutting state of the claw portions. Also, Figures 8 and 9 are diagrams showing the body side mount 210 and the lens side mount 310 as viewed from the subject side toward the image sensor 270 side (as viewed in the +Z direction), with the lens side mount 310 being reversed left to right from Figures 5 and 6.

[0063] When attaching the interchangeable lens 3 to the camera body 2, first, an index (not shown) on the outer peripheral surface of the interchangeable lens 3 is aligned with an index (not shown) on the exterior surface of the camera body 2, the body side mount 210 and the lens side mount 310 are opposed to each other, and each lens side claw 390 is inserted into each body side insertion / removal portion 280. That is, as shown in Fig. 8, the lens side first claw 390a is inserted into the body side first insertion / removal portion 280a, the lens side second claw 390b is inserted into the body side second insertion / removal portion 280b, the lens side third claw 390c is inserted into the body side third insertion / removal portion 280c, and the lens side fourth claw 390d is inserted into the body side fourth insertion / removal portion 280d. At this time, the body side first claw portion 290a is inserted into the lens side second insertion / removal portion 380b, the body side second claw portion 290b is inserted into the lens side third insertion / removal portion 380c, the body side third claw portion 290c is inserted into the lens side fourth insertion / removal portion 380d, and the body side fourth claw portion 290d is inserted into the lens side first insertion / removal portion 380a. The position of the interchangeable lens 3 with respect to the camera body 2 at this time is referred to as the insertion position.

[0064] From the above insertion position, the interchangeable lens 3 is rotated in an attachment direction 44 shown in Fig. 8. The attachment direction 44 is a direction along a circumferential direction centered on the optical axis O, in a plane approximately perpendicular to the optical axis O. As the interchangeable lens 3 rotates, the body side first claw portion 290a and the leaf spring 213a enter the space between the lens side first claw portion 390a and the reference surface 311.

[0065] That is, the lens side first claw 390a enters the image sensor 270 side (+Z side) of the body side first claw 290a, and the lens side first claw 390a faces the image sensor 270 side (+Z side) of the leaf spring 213a. At the same time, the body side first claw 290a and the leaf spring 213a enter the space between the lens side first claw 390a and the reference surface 311. Similarly, body side second claw 290b and leaf spring 213b enter the space between lens side second claw 390b and reference surface 311, body side third claw 290c and leaf spring 213c enter the space between lens side third claw 390c and reference surface 311, and body side fourth claw 290d and leaf spring 213d enter the space between lens side fourth claw 390d and reference surface 311. At this time, the lens side terminal group comes into contact with the body side terminal group in turn. Although the interchangeable lens 3 is rotated in the mounting direction 44 relative to the camera body 2 , the camera body 2 may be rotated in the opposite direction to the mounting direction 44 relative to the interchangeable lens 3 .

[0066] Fig. 9 is a diagram showing the interchangeable lens 3 rotated a first angle in the mounting direction 44 relative to the camera body 2 from the insertion position in Fig. 8, and shows the state where the interchangeable lens 3 has been completely mounted on the camera body 2. The position of the interchangeable lens 3 at this time is referred to as the mounted position. The first angle is approximately 40 degrees in this embodiment, and is between 38.5 degrees and 41.5 degrees.

[0067] At the attached position, the lock pin 214 of the camera body 2 is pushed in the -Z direction and enters the lock pin receiving portion 314 of the interchangeable lens 3. When the lock pin 214 enters the lock pin receiving portion 314, the interchangeable lens 3 is restricted from rotating for removal from the camera body 2. In other words, when the body side claws 290 and the lens side claws 390 reach the attached position, the relative positions in the circumferential direction between the body side mount 210 and the lens side mount 310 are determined.

[0068] Furthermore, the lens-side claw portion 390 is pressed towards the imaging element 270 (in the +Z direction) by the leaf spring 213, and the reference surface 311 of the lens-side mount 310 comes into contact with the reference surface 211 of the body-side mount 210. The lens-side mount 310 comes into surface contact with the body-side mount 210 and is biased by the leaf spring 213, so that the interchangeable lens 3 and the camera body 2 are firmly attached. In the attached position, each of the plurality of lens side terminals contacts and is electrically connected to a corresponding one of the plurality of body side terminals.

[0069] The state from when each lens-side claw portion 390 in Fig. 8 is inserted into the corresponding body-side insertion / removal portion 280 at the insertion position to just before the mounting position in Fig. 9 is called the mounting state. Since the lock pin 214 of the camera body 2 is pressed in the -Z direction, in the mounting state, the -Z end of the lock pin 214 comes into contact with the lock pin sliding surface 309 of the lens-side mount 310.

[0070] As the interchangeable lens 3 rotates, the -Z direction end of the lock pin 214 slides on the lock pin sliding surface 309 of the interchangeable lens 3. For that reason, no fixing screw for fixing the lens side mount 310 is arranged in a first angle range from the lock pin receiving portion 314 of the lock pin sliding surface 309 in the opposite direction to the mounting direction 44. By not arranging a fixing screw in the first angle range in the opposite direction, the -Z direction end of the lock pin 214 does not hit a fixing screw when sliding on the lock pin sliding surface 309, so the interchangeable lens 3 can be attached and detached smoothly.

[0071] (How to remove the interchangeable lens 3 from the camera body 2) When the user presses an unlock button (not shown) on the camera body in the attached position, the lock pin 214 retracts from the lock pin receiver 314 to the image sensor 270 side. This releases the restriction on rotation of the interchangeable lens 3 relative to the camera body 2, allowing the lens-side mount 310 to be rotated relative to the body-side mount 210. When the interchangeable lens 3 is rotated in the direction opposite to the attachment direction 44 (removal direction) relative to the camera body 2 while pressing the lock release button (not shown), each lens-side claw 390 moves from a position facing the image side of each body-side claw 290 to the position of each body-side insertion / removal portion 280, and reaches the insertion position shown in FIG.

[0072] (Explanation of over-rotation in the installation direction) Next, with reference to Fig. 10, an overrotation state in which the interchangeable lens 3 is rotated by a first angle or more in the mounting direction 44 relative to the camera body 2 will be described. Fig. 10 is a schematic diagram showing the positional relationship between the body-side fourth claw portion 290d of the camera body 2 and the lens-side fourth claw portion 390d of the interchangeable lens 3, where the upper part (a) of the dashed dotted line is a view seen from the subject side toward the image sensor 270 side, and the lower part (b) of the dashed dotted line is a view seen from the side of the lens mount mechanism. When mounting the interchangeable lens 3 to the camera body 2, if the user rotates the interchangeable lens 3 in the mounting direction 44 while pressing the lock release button, the lock pin 214 does not enter the lock pin receiving portion 314 at the mounting position. Therefore, the interchangeable lens 3 can be rotated further relative to the camera body 2 from the mounting position shown in Fig. 9. When the interchangeable lens 3 is rotated further in the mounting direction 44 relative to the camera body 2 from the mounting position, the limiting pin 315 abuts against the rear end of the body side fourth claw portion 290d in the mounting direction 44, preventing the interchangeable lens 3 from rotating further relative to the camera body 2.

[0073] (Explanation of over-rotation in the removal direction) Next, with reference to Fig. 11, an overrotated state in which the interchangeable lens 3 is rotated from the insertion position in the direction opposite to the mounting direction 44 (removal direction) relative to the camera body 2 will be described. Fig. 11 is a side view of a part of the lens mount mechanism in an overrotated state in the removal direction. Since the limiting pin 315 is disposed at the rear end of the lens side fourth claw portion 390d in the mounting direction 44, if the user attempts to rotate the interchangeable lens 3 in the reverse direction after inserting it into the camera body 2, the limiting pin 315 comes into contact with the tip of the body side third claw portion 290c in the mounting direction 44, preventing the interchangeable lens 3 from rotating any further in the removal direction relative to the camera body 2.

[0074] In this way, the limit pin 315 prevents overrotation in both the mounting direction 44 and the removal direction by abutting against the circumferential end of the body side claw portion 290. Because the limit pin 315 prevents overrotation in both the mounting direction 44 and the removal direction, there is no need to prepare two members, one for preventing overrotation in the mounting direction 44 and one for preventing overrotation in the removal direction. Furthermore, since the limiting pin 315 utilizes the circumferential end of the body side claw portion 290 to prevent overrotation, there is no need to provide a separate member that abuts against the limiting pin 315 during overrotation.

[0075] (Explanation of the misinsertion state) Next, an erroneous insertion state will be described in which the user inserts the interchangeable lens 3 into the camera body 2 at a wrong position without matching the index of the interchangeable lens 3 with the index of the camera body 2. In the erroneous insertion state, the lens side claw portion 390 does not pass through the body side insertion / 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 the positional relationship at the insertion position. FIGS. 12 and 13 are schematic diagrams 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, and show the abutting state of the claw portions. Also, FIGS. 12 and 13 are diagrams showing the body side mount 210 and the lens side mount 310 as viewed from the subject side toward the image sensor 270 side (as viewed in the +Z direction), and the lens side mount 310 is reversed left and right from FIGS. 5 and 6. As an example of an erroneous insertion state, FIG. 12 shows a state in which the index of the interchangeable lens 3 and the index of the camera body 2 are shifted by 15 degrees in the removal direction from the insertion position. 13(a) to (c) show a state in which the index of the interchangeable lens 3 and the index of the camera body 2 are shifted at intervals of 90 degrees from the insertion position.

[0076] Fig. 12 shows a state where the lens side claw 390 is shifted 15 degrees in the removal direction from the insertion position (first erroneous insertion state). As shown by hatching in Fig. 12, the lens side claw 390 abuts against the body side claw 290 at the four portions indicated by the symbols γ1 to γ4, so that the lens side claw 390 is not inserted into the body side insertion / removal portion 280. That is, in the first erroneous insertion state, the lens side claw 390 and the body side claw 290 abut against each other at four points, thereby reliably preventing erroneous insertion.

[0077] Fig. 13(a) is a diagram showing a state (second erroneous insertion state) in which the index of the interchangeable lens 3 and the index of the camera body 2 are shifted by approximately 90 degrees in the removal direction from the insertion position. Fig. 13(b) is a diagram showing a third erroneous insertion state in which the index of the interchangeable lens 3 and the index of the camera body 2 are shifted by approximately 180 degrees in the removal direction from the insertion position. Fig. 13(c) is a diagram showing a fourth erroneous insertion state in which the index of the interchangeable lens 3 and the index of the camera body 2 are shifted by approximately 270 degrees in the removal direction from the insertion position.

[0078] 13(a), in the second erroneous insertion state, the lens-side third claw 390c abuts against the body-side first claw 290a at a portion indicated by γ5 and against the body-side second claw 290b at a portion indicated by γ7, and therefore cannot be inserted into the body-side second insertion / removal portion 280b. Also, the lens-side first claw 390a abuts against the body-side fourth claw 290d at a portion indicated by γ6, and therefore cannot be inserted into the body-side fourth insertion / removal portion 280d. Thus, in the second erroneous insertion state, the lens-side claw 390 abuts against the body-side claw 290 at three points to prevent erroneous insertion.

[0079] 13(b), in the third erroneous insertion state, the lens side fourth claw 390d abuts against the body side first claw 290a at a portion indicated by γ8, and cannot be inserted into the body side second insertion / removal portion 280b. Also, the lens side first claw 390a abuts against the body side third claw 290c at a portion indicated by γ9, and cannot be inserted into the body side first insertion / removal portion 280a. Thus, in the third erroneous insertion state, the lens side claw 390 abuts against the body side claw 290 at two points, preventing erroneous insertion.

[0080] 13(c), in the fourth erroneous insertion state, the lens side first claw 390a abuts against the body side first claw 290a at a portion indicated by γ10 and against the body side second claw 290b at a portion indicated by γ11, and therefore cannot be inserted into the body side second insertion / removal portion 280b. Also, the lens side third claw 390c abuts against the body side third claw 290c at a portion indicated by γ12, and therefore cannot be inserted into the body side fourth insertion / removal portion 280d. Thus, in the fourth erroneous insertion state, the lens side claw 390 abuts against the body side claw 290 at three points to prevent erroneous insertion.

[0081] As described above, in an erroneous insertion state other than the insertion position, the lens side claw portion 390 abuts against the body side claw portion 290 at at least two points, thereby prohibiting the lens side claw portion 390 from being inserted into the body side insertion / removal portion 280 at positions other than the insertion position. Therefore, even if an attempt is made to attach the interchangeable lens 3 to the camera body 2 in the erroneous insertion position, erroneous insertion can be reliably prevented by the claw portions abutting against each other at least two points.

[0082] In the first to fourth erroneous insertion states, one of the two or more abutment points is located on the upper side of the image sensor 270. That is, in the erroneous insertion position, any one of the lens side first claw portion 390a to the lens side third claw portion 390c abuts on the end of the body side first claw portion 290a on the tip side in the mounting direction 44, preventing the lens side first claw portion 390a to the lens side third claw portion 390c from being inserted into the body side second insertion / removal portion 280b. As described above, the body side terminal holding portion 220 is disposed in the opening 212 of the body side mount 210 and above the image sensor 270. The body side first claw portion 290a is located on the upper part of the body side terminal holding portion 220, and the body side first claw portion 290a has the longest circumferential length among the four body side claw portions 290. Further, the body side second insertion / removal portion 280b is located at the top of the body side terminal holding portion 220, and the body side second insertion / removal portion 280b is the shortest of the four body side insertion / removal portions 280. Therefore, only the lens side second claw portion 390b is inserted into the body side second insertion / removal portion 280b at the correct insertion position, and the other lens side first claw portion 390a to lens side third claw portion 390c are not erroneously inserted into the body side second insertion / removal portion 280b. Furthermore, the lens side first claw portion 390a to lens side third claw portion 390c do not enter the body side second insertion / removal portion 280b at an angle (inclined in a direction intersecting the optical axis O direction). This prevents the lens side claw portions 390a to 390c from hitting the body side terminal holding portion 220 and damaging the body side terminals in an erroneous insertion state. In addition, the body side first claw portion 290a prevents erroneous insertion by contacting any of the lens side claw portions 390 in the erroneous insertion state, but since the body side first claw portion 290a has the longest circumferential length and high durability among the four lens side claw portions 290, the possibility of the body side first claw portion 290a being damaged in the erroneous insertion can be reduced. In addition, in the second to fourth erroneous insertion states, at least one of the contact points is located opposite the body side terminal holding portion 220 across the optical axis O. In other words, one of the contact points is near the body side terminal holding portion 220 and above the body side second straight line B2 passing through the optical axis O, and one of the contact points is below the body side second straight line B2 passing through the optical axis O.Therefore, in the second to fourth erroneous insertion states, although there are two or three contact points, the contact points are above and below the body-side second straight line B2 passing through the optical axis O, so the possibility of erroneous insertion can be reduced. In the first to fourth erroneous insertion states, one of the two or more abutting points is located on the outer periphery of the lens side terminal holding part 320. That is, in the erroneous insertion position, one of the first to fourth body side claws 290a to 290d abuts on the end of the lens side first claw 390a on the tip side in the mounting direction 44. This prevents the other second to fourth body side claws 290b to 290d from being erroneously inserted into the lens side second insertion / removal part 380b. As described above, the end of the body side first claw 290a on the tip side in the mounting direction 44 is located on the upper part of the lens side terminal holding part 320. This prevents the lens side first claw 290a from passing through the body side insertion / removal parts 280b to 280d other than the body side first insertion / removal part 280a and hitting the lens side terminal holding part 320, thereby damaging the lens side terminal. In addition, in an incorrect insertion state, the lens side first claw portion 390a comes into contact with one of the body side claw portions 290 to prevent incorrect insertion. However, since the lens side first claw portion 390a has the second longest circumferential length of the four lens side claw portions 390 and is relatively durable, it also reduces the possibility of the lens side first claw portion 390a being damaged in the event of incorrect insertion.

[0083] Here, as shown in Fig. 8, the lens side second claw 390b passes through the body side second insertion / removal portion 280b and is disposed at the insertion position, and faces the body side second claw 290b at the mounting position. The angle α6 (Fig. 6) of the lens side second claw 390b is smaller than the angle β2 (Fig. 3) of the body side second insertion / removal portion 280b. The angle β2 of the body side second insertion / removal portion 280b is smaller than the first angle from the insertion position to the mounting position. Therefore, by making the lens side second claw 390b smaller than the first angle, the body side second insertion / removal portion 280b is made smaller, and it is possible to prevent the lens side claws 390 other than the lens side second claw 390b from passing through in an erroneous insertion state. In particular, in the second to fourth erroneous insertion states in which the lens side claw 390 and the body side claw 290 come into contact with each other at two or three points, it is possible to prevent the lens side claws 390a, 390c, and 390d other than the lens side second claw 390b from passing through the body side second insertion / removal portion 280b. Since the body side terminal holding portion 220 is disposed on the inner diameter side of the body side second insertion / removal portion 290b, 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 hitting the body side terminal holding portion 220 and damaging the body side terminals. Incidentally, angle α6 of lens side second claw portion 390b may be smaller than angles α5, α7, α8 of lens side first claw portion 390a, lens side third claw portion 390c, and lens side fourth claw portion 390d. Angle β2 of body side second insertion / removal portion 280b may be smaller than angles α5, α7, α8 of lens side first claw portion 390a, lens side third claw portion 390c, and lens side fourth claw portion 390d.

[0084] According to the above-described embodiment, the interchangeable lens 3 can be attached to the camera body 2 in a state in which it can be used properly. 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, so that even if an impact is applied to either the interchangeable lens 3 or the camera body 2, there are four protrusions (lens-side claws 390, body-side claws 290) each, providing high impact resistance.

[0085] In addition, when an 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 the respective terminals of the camera body 2 and the interchangeable lens 3, allowing the camera system 1 to be used appropriately.

[0086] The four protrusions of the interchangeable lens 3 are arranged on a line that intersects the optical axis O at approximately 45 degrees with respect to the line connecting the center of the contact holder and the optical axis O, and are in contact with four leaf springs 213 arranged at approximately 90 degree intervals around the optical axis O to face the four protrusions of the camera body 2. This provides high shock resistance whether the camera system 1 is held horizontally or vertically. In particular, even if either the interchangeable lens 3 or the camera body 2 receives a vertical shock, two protrusions are arranged on each of the right and left sides of the line (B1, L1) connecting the center of the contact holder and the optical axis O, so that the vertical shock can be absorbed by two or more protrusions.

[0087] The body side second claw portion 290b and the body side fourth claw portion 290d are arranged on the body side third straight line B3, and the body side first claw portion 290a and the body side third claw portion 290c are arranged on the body side fourth straight line B4. Here, the angle α4 of the body side fourth claw portion 290d is the third largest among the four body side claw portions 290, and the angle α2 of the body side second claw portion 290b is the smallest (fourth largest) among the four body side claw portions 290. In addition, the angle α1 of the body side first claw portion 290a is the largest among the four body side claw portions 290, and the angle α3 of the body side third claw portion 290c is the second largest among the four body side claw portions.

[0088] Therefore, when an impact is applied to either the interchangeable lens 3 or the camera body 2 in the up-down direction, the force 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) is approximately equal. Even when an impact is applied to the left-right direction, the force 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) is approximately equal.

[0089] The lens side first claw portion 390a and the lens side third claw portion 390c are arranged on the lens side third straight line L3, and the lens side second claw portion 390b and the lens side fourth claw portion 390d are arranged on the lens side fourth straight line L4. Here, the angle α8 of the lens side fourth claw portion 390d is the third largest among the four lens side claw portions 390, and the angle α6 of the lens side second claw portion 390b is the smallest (fourth largest) among the four lens side claw portions 390. In addition, the angle α5 of the lens side first claw portion 390a is the second largest among the four lens side claw portions, and the angle α7 of the lens side third claw portion 390c is the largest among the four lens side claw portions.

[0090] Therefore, when an impact is applied to either the interchangeable lens 3 or the camera body 2 in the up-down direction, the force 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) is approximately equal. Even when an impact is applied to the left-right direction, the force 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) is approximately equal.

[0091] In this embodiment, the lens-side first claw 390a and the lens-side third claw 390c arranged on the lens-side third straight line L3 have a larger angle than the lens-side third claw 390c, and the lens-side second claw 390b and the lens-side fourth claw 390d arranged on the lens-side fourth straight line L4 have a larger angle than the lens-side fourth claw 390d. That is, of the two lens-side claws 390 facing each other across the optical axis O, the two lens-side claws 390 below the lens-side second straight line L2 (horizontal direction) are larger. Therefore, when the camera system is held in the horizontal position, the two lens-side claws 390 at the larger angle below the lens-side second straight line L2 can receive an impact from below the interchangeable lens 3 over a wide area. Furthermore, when the interchangeable lens 3 receives an impact from below with the camera system held in the horizontal position, the lens-side claw 390 below the lens-side second straight line L2 receives the impact in a direction approaching the body-side claw 290 (-Z direction). Here, the leaf spring 213 presses the lens-side claw 390 in a direction away from the body-side claw 290 (+Z direction). Therefore, even if the interchangeable lens 3 receives an impact from below with the camera system held in the horizontal position, the lens-side claw 390 below the lens-side second straight line L2 has a large area and can absorb the impact with the biasing force of the leaf springs 213 of the opposing body-side claws 290, resulting in high impact resistance.

[0092] With the interchangeable lens 3 attached to the camera body 2, the lens side terminal holding part 320 is disposed above the image sensor 270. With the camera system 1 held horizontally, sunlight entering the interchangeable lens 3 is incident on the lower side of the emission side of the interchangeable lens 3, so ghosting is likely to occur below the image sensor 270, but in this embodiment, the lens side terminal holding part 320 is disposed above the image sensor 270 instead of below it, so ghosting can be suppressed.

[0093] The four leaf springs 213 are arranged at intervals of approximately 90 degrees around the optical axis O. Therefore, at least two of the four leaf springs 213 contact two lens side claws 390 across the optical axis O, and the two lens side claws 390 are pressed in the +Z direction. In this embodiment, the interchangeable lens 3 is provided with 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 lens side claws 390 are arranged at positions facing each other across the optical axis O, so that the lens side claws are pressed by the two leaf springs 213 arranged at positions facing each other across the optical axis O. Therefore, even if the lens side claws 390 of the interchangeable lens 3 are damaged and the number is insufficient, it is possible to provide a camera system 1 that allows the interchangeable lens 3 to be attached to the camera body 2 in a usable state. Furthermore, since the leaf spring 213 is on the straight line B5 (FIG. 4), the lens side terminal in the vicinity of the straight line B5 can be strongly pressed against the body side terminal.

[0094] The following modifications are also possible, and one or more of the modifications may be combined with the above-described embodiment. (Modification)

[0095] It is also possible to remove one of the four lens side claws 390 and have three lens side claws. Even with three lens side claws, the leaf springs 213 of the camera body 2 are arranged at 90 degree intervals around the optical axis O, so that the lens side claws are pressed by at least three leaf springs 213 and the camera can be attached in a usable state.

[0096] Of the four lens side claws 390, two that face each other across the optical axis O may be removed, and two lens side claws that face each other across the optical axis O may be provided. Even with two lens side claws, they face each other across the optical axis O, and the leaf springs of the camera body 2 are arranged at 90 degree intervals around the optical axis, so that the lens side claws can be pressed by at least the leaf springs 213 that face each other across the optical axis O and can be attached in a usable state. In addition, when the camera is configured to have two lens side claws that face each other across the optical axis O, it is preferable to place one of the two lens side claws in a position close to the center of the lens side terminal holding part 320. By placing the lens claw in a position close to the center of the lens side terminal holding part 320 and bringing it into contact with the leaf spring 213, the lens side terminal and the body side terminal can be brought into contact with each other, and the camera system 1 can be used appropriately.

[0097] There is no particular limitation on the material of the lens side mount 310, and it may be metal or resin. Furthermore, the end of the lens side mount 310 (the outer peripheral end of the lens side claw portion 390, the circumferential end of the lens side claw portion 390, the end of the cylindrical portion 312 in the optical axis O direction, etc.) may be formed with at least a partial inclination. The end of the lens side mount 310 does not have to be inclined, and may have a step in part.

[0098] There is no particular limitation on the shape of the lens side terminal holding part 320, and it can be changed as appropriate. In particular, by inclining the circumferential end of the lens side terminal holding part 320, contact with the body side terminal holding part 220 can be made smooth when the lens side terminal holding part 320 is rotated from the insertion position to the attachment position. In addition, although the lens side terminal holding portion 320 is provided with a plurality of lens side terminals arranged in an arc shape, the position of the lens side terminals may be shifted within a range in which they come into contact with the body side terminals when the interchangeable lens 3 is attached to the camera body 2.

[0099] The center position and length of the lens side claw 390 in the circumferential direction can be changed as appropriate within the range in which the lens side claw 390 is pressed by the leaf spring 213 in the mounting position. The center position of the lens side claw 390 in the circumferential direction and the center position of the biased portion in the circumferential direction may be disposed at different positions. In other words, the position to which the lens side claw 390 is pressed from the center position of the leaf spring 213 in the circumferential direction may be a position different from the center position of the lens side claw 390 in the circumferential direction. Similarly, the center position of the lens side claw 390 in the circumferential direction and the center position of the body side claw 290 in the circumferential direction may not coincide with each other in the mounting position. Also, the length of the lens side claw 390 in the circumferential direction and the length of the corresponding body side claw 290 in the circumferential direction may not coincide with each other.

[0100] In this embodiment, the interchangeable lens 3 of the camera system 1 has been described as an example of an accessory, but the accessory is not limited to the interchangeable lens 3. For example, the accessory may be a teleconverter, wide converter, close-up ring, etc. that is attached between the camera body 2 and the interchangeable lens 3 and changes the focal length of the interchangeable lens 3. Alternatively, the present invention may be applied to a mount adapter that allows an accessory including an interchangeable lens 3 of a different mount standard to be attached to the mount standard of the camera body 2 described above. In other words, the present invention may be applied to any accessory that is used by attaching it to the mount of the camera body 2. In that case, the lens side claw portion, the lens side terminal, etc. correspond to the accessory side protrusion portion, the accessory side terminal, etc. of the respective accessories.

[0101] In the above embodiment, the accessory is detachable from the camera body 2, but the above camera body 2 may be a mount adapter that enables an interchangeable lens 3 of the above mount standard to be attached to a camera body different from the above mount standard, and the above accessory may be configured to be attachable to the mount adapter.

[0102] Although various embodiments and modifications have been described above, the present invention is not limited to these. Other embodiments that are conceivable within the scope of the technical idea of ​​the present invention are also included within the scope of the present invention. [Explanation of symbols]

[0103] 1...camera system, 2...camera body, 3...interchangeable lens, 44...mounting direction, 210...body side mount, 211...reference surface, 212...opening, 213...leaf spring, 220...body side terminal holder, 270...imaging element, 290...body side claw, 309...sliding surface for lock pin, 310...lens side mount, 311...reference surface, 312...cylindrical portion, 320...lens side terminal holder, 360...imaging optical system, 390...lens side claw, B1 to B4...body side first straight line to fourth straight line, L1 to L4...lens side first straight line to fourth straight line, B5...straight line, O...optical axis

Claims

[Claim 1] The camera body has a rectangular imaging element having upper and lower sides and right and left sides when the camera body is held in a horizontal position, and receives subject light centered on an optical axis; a body side terminal group consisting of a plurality of body side terminals arranged in an arc shape above the upper side of the imaging element; a ring-shaped body side mount centered on the optical axis and arranged outside the imaging element and the body side terminal group; a first body side protrusion protruding inward from the body side mount; a second body side protrusion protruding inward from the body side mount; a third body-side protrusion protruding in an inward radial direction from a body-side mount, and a fourth body-side protrusion protruding in an inward radial direction from the body-side mount, wherein the first body-side protrusion, the second body-side protrusion, the third body-side protrusion, and the fourth body-side protrusion are respectively arranged in four regions divided by a body-side first straight line passing through a center in the arc direction of the body-side terminal group and the optical axis, and a body-side second straight line perpendicular to the body-side first straight line and the optical axis, an accessory side mount that is annular about the optical axis and in contact with the body side mount; a cylindrical portion extending in the optical axis direction from an inner peripheral edge portion of the accessory side mount; an accessory side terminal group including a plurality of accessory side terminals arranged inside the cylindrical portion and contacting the body side terminals when the camera is attached to the camera body; a first accessory side protrusion protruding from the cylindrical portion toward an outer periphery of the accessory side mount and extending in a circumferential direction centered on the optical axis; a second accessory side protrusion protruding from the cylindrical portion toward an outer periphery of the accessory side mount and extending in a circumferential direction around the optical axis; a third accessory side protrusion protruding from the cylindrical portion toward an outer periphery of the accessory side mount and extending in a circumferential direction around the optical axis; a fourth accessory side protrusion protruding from the cylindrical portion toward an outer periphery of the accessory side mount and extending in a circumferential direction around the optical axis; Equipped with An accessory in which the first accessory side protrusion and the third accessory side protrusion are arranged on an accessory side third line that intersects an accessory side first line passing through the center of the accessory side terminal group and the optical axis at approximately 45 degrees on the optical axis, and the second accessory side protrusion and the fourth accessory side protrusion are arranged on an accessory side fourth line that is perpendicular to the accessory side third line at the optical axis.

Images