JP2022186844A - camera body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach an accessory to a camera body in an appropriately usable state.

SOLUTION: A camera body is attachable to and detachable from an accessory having a lens, an accessory-side mount, and an accessory-side terminal, and includes a body-side mount, a body-side terminal group, a first body-side protrusion, a second body-side protrusion, a third body-side protrusion, a fourth body-side protrusion, a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member. The first elastic member and the third elastic member are arranged at positions facing each other with an optical axis interposed therebetween. The second elastic member and the fourth elastic member are arranged at positions facing each other with the optical axis interposed therebetween.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to camera bodies.

An accessory that can be attached to and detached from a camera body is known (for example, Patent Document 1). Conventionally, it has been necessary to attach accessories to the camera body in a state in which they can be used properly.

JP-A-8-43910

A camera body according to a first aspect of the present invention is a camera body to which an accessory can be attached/detached, having a lens, an accessory-side mount, and an accessory-side terminal, the camera body having an annular shape centered on the optical axis of the lens, and the accessory a body side mount that contacts the side mount; a body side terminal group that includes a plurality of body side terminals that contact the accessory side terminal when the accessory is attached; a first body-side projecting portion projecting toward and extending in a circumferential direction around the optical axis; a second body-side projecting portion extending in the circumferential direction, and a third body-side projecting portion projecting from the body-side mount toward the inner peripheral direction of the body-side mount and extending in the circumferential direction about the optical axis. a body-side projecting portion, a fourth body-side projecting portion projecting from the body-side mount toward an inner peripheral direction of the body-side mount and extending in a circumferential direction about the optical axis, and the first body. A first elastic member arranged on the image side of the side projecting portion, a second elastic member arranged on the image side of the second body side projecting portion, and a second elastic member arranged on the image side of the third body side projecting portion. a third elastic member; and a fourth elastic member disposed on the image side of the fourth body-side projecting portion, wherein the first elastic member and the third elastic member face each other across the optical axis. The second elastic member and the fourth elastic member are arranged at positions facing each other with the optical axis interposed therebetween.

It is a sectional view showing composition of a camera system typically. 4 is a front view of the mount surface of the camera body viewed from the interchangeable lens side; FIG. 4 is a front view of the mount surface of the camera body viewed from the interchangeable lens side; FIG. FIG. 4 is a front view of a leaf spring in the body-side mount; 2 is a front view of the mount surface of the interchangeable lens viewed from the camera body side; FIG. 2 is a front view of the mount surface of the interchangeable lens viewed from the camera body side; FIG. 3 is a perspective view of the mount surface of the interchangeable lens; FIG. FIG. 4 is a front view of the body-side claw portion and the lens-side claw portion at the insertion position, viewed from the interchangeable lens side; FIG. 4 is a front view of the body-side claw portion and the lens-side claw portion at the mounting position, viewed from the interchangeable lens side; FIG. 10 is a front view and a side view of the body-side claw portion and the lens-side claw portion in an overrotation state in the mounting direction, as viewed from the interchangeable lens side; FIG. 10 is a side view of the body-side claw portion and the lens-side claw portion in an overrotation state in the removal direction, as seen from the interchangeable lens side; FIG. 10 is a front view of the body-side claw portion and the lens-side claw portion in the first misinsertion state, viewed from the interchangeable lens side; FIG. 8 is a front view 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 seen from the interchangeable lens side;

FIG. 1 is a cross-sectional view showing the outline of the configuration of a camera system 1 according to one embodiment of the invention. A camera system 1 includes a camera body 2 and an interchangeable lens 3 as an example of an accessory detachable from the camera body 2 . Examples of other accessories attachable to and detachable from the camera body 2 include mount adapters, teleconverters, wide converters, and the like.

The interchangeable lens 3 has a lens side mount 310 , a lens side terminal holding section 320 , a lens side CPU 330 , a lens side communication section 340 , a lens side storage section 350 , an imaging optical system 360 and a drive section 370 . The lens-side mount 310 and the lens-side terminal holding portion 320 will be detailed later.

The lens side CPU 330 is composed of a microcomputer and its peripheral circuits. The lens side communication section 340 performs predetermined data communication with the camera body 2 . The lens side communication section 340 is connected to a lens side terminal (described later) provided in the lens side terminal holding section 320 and the lens side CPU 330 . The lens side storage unit 350 is a nonvolatile storage medium. The lens side storage section 350 is connected to the lens side CPU 330 . A predetermined control program or the like executed by the lens side CPU 330 is stored in advance in the lens side storage section 350 . The lens-side CPU 330 controls the interchangeable lens 3 by reading a control program from the lens-side storage unit 350 and executing the program.

The imaging optical system 360 forms a subject image on an imaging surface of an imaging element 270, which will be described later. The optical axis O of the imaging optical system 360 coincides with the center position of the lens side mount 310 and the body side mount 210 described later. The imaging optical system 360 of 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 drive unit 370 is connected to the lens side CPU 330 and has an actuator (not shown) and the like. The drive unit 370 moves the focusing lens 362 back and forth in the direction of the optical axis O (+Z and -Z directions) by using the actuator or the like.

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 imaging element 270 . Body-side mount 210 and body-side terminal holding portion 220 will be described in detail later.

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 section 240 performs predetermined data communication with the interchangeable lens 3 . Body-side communication unit 240 is connected to a plurality of body-side terminals (described later) provided in body-side terminal holding unit 220 and body-side CPU 230 .

The body-side storage unit 250 is a non-volatile storage medium. Body-side storage unit 250 is connected to body-side CPU 230 . The body-side storage unit 250 preliminarily stores predetermined control programs and the like executed by the body-side CPU 230 . The body side CPU 230 controls the camera body 2 by reading the control program from the body side storage section 250 and executing the program.

The power supply unit 260 has a power supply and supplies power to the inside of the camera body 2 and the interchangeable lens 3 . Power supply unit 260 is connected to body-side terminals (described later) provided in body-side terminal holding unit 220 and body-side CPU 230 . The imaging device 270 is a solid-state imaging device such as CCD or CMOS, for example. The imaging element 270 is connected to the body side CPU 230, images a subject, and outputs an imaging signal. Description of the processing of the output imaging signal is omitted.

(Description of lens mount mechanism)
The camera system 1 of this embodiment includes a so-called bayonet 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.

(Body side mount 210)
2 and 3 are diagrams schematically showing the mount of the camera body 2 viewed from the interchangeable lens 3 side. 2 and 3 show a state in which the camera body 2 is held horizontally. As shown in FIG. 2, when the camera body 2 is held horizontally, the rectangular imaging element 270 is horizontally long, that is, the long sides are the upper and lower sides, and the short sides are the right and left sides. A body-side first straight line B1 extending in the vertical direction Y of the camera body 2, indicated by a solid line in FIG. Up-down direction. A body-side second straight line B2 extending in the horizontal direction X of the camera body 2, indicated by a solid line in FIG. Left and right direction.

The first body-side straight line B1 and the second body-side straight line B2 are orthogonal to each other on the optical axis O (center). As indicated by the dashed line in FIG. 2, a line extending in a direction intersecting the first body-side straight line B1 and the second body-side straight line B2 on the optical axis O of the imaging device 270 at 45 degrees is defined as a third body-side straight line B3. , body-side fourth straight line B4.

The mount of the camera body 2 includes the body-side mount 210 and the body-side terminal holding portion 220 described above with reference to FIG. The body-side mount 210 has an annular reference plane 211 that has a constant width and is arranged along a plane perpendicular to the optical axis O. As shown in FIG. Further, the body-side mount 210 has 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, namely, body-side first claw portion 290a to fourth body-side claw portion 290d are collectively referred to as body-side claw portion 290. As shown in FIG.

The body-side claws 290 are spaced apart from each other along the circular opening 212 of the body-side mount 210 . As shown in FIG. 2, the first body side claw portion 290a is located at the upper right position, the second body side claw portion 290b is located at the upper left position, the third body side claw portion 290c is located at the lower left position, and the fourth body side claw portion 290c is located at the lower left position. The claw portion 290d is arranged at the lower right position. The body-side first claw portion 290a is located above the body-side second straight line B2 and on the right side of the body-side first straight line B1, and the body-side second claw portion 290b is located above the body-side second straight line B2 and on the body side. In the region on the left side of the first straight line B1, the third body side claw portion 290c is below the second straight line B2 on the body side and on the left side of the first straight line B1 on the body side. They are arranged in regions below the second side straight line B2 and on the right side of the first body side straight line B1.

The first body-side claw portion 290a and the third body-side claw portion 290c are arranged on the fourth body-side straight line B4 in substantially symmetrical regions with the optical axis O as the center. The second body-side claw portion 290b and the fourth body-side claw portion 290d are arranged on the third body-side straight line B3 and in substantially symmetrical regions with the optical axis O as the center.
As shown in FIG. 2, the center positions along the circumferential direction of the first body-side claw portion 290a to the fourth body-side claw portion 290d are the third body-side straight line B3 and the fourth body-side straight line B4. do not overlap.

As shown in FIG. 3, the lengths in the circumferential direction of the first body-side claw portion 290a to the fourth body-side claw portion 290d are different. 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 longest. Shortest.
An angle α1 between a straight line connecting one end of the first body-side claw portion 290a and the optical axis O and a straight line connecting the other end of the first body-side claw portion 290a and the optical axis O is about 47 degrees. .5 degrees to 47.5 degrees.
An angle α3 between a straight line connecting one end of the body-side third claw portion 290c and the optical axis O and a straight line connecting the other end of the body-side third claw portion 290c and the optical axis O is approximately 42.5 degrees. , between 42.0 and 43.0 degrees.

An angle α4 between a straight line connecting one end of the fourth body-side claw portion 290d and the optical axis O and a straight line connecting the other end of the fourth body-side claw portion 290d and the optical axis O is approximately 42 degrees. It is between 0.5 and 42.5 degrees.
The angle α2 between a straight line connecting one end of the second body-side claw portion 290b and the optical axis O and a straight line connecting the other end of the second body-side claw portion 290b and the optical axis O is about 40 degrees. .0 degrees to 41.0 degrees.
The lengths in the radial direction (height of the claw portions) of the first body-side claw portion 290a to the fourth body-side claw portion 290d are the same. Further, the lengths in the direction of the optical axis O (thicknesses of the claw portions) of the first body-side claw portion 290a to the fourth body-side claw portion 290d are the same.

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 imaging device 270). There is a portion where the body-side claw portion 290 does not exist. In the following description, a space 280a 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 mount 210 is referred to as a first body-side insertion/removal portion 280a.

Similarly, the space 280b between the first body-side claw portion 290a and the first body-side claw portion 290b is defined by the second insertion/extraction portion 280b, and the second body-side claw portion 290b and the third body-side claw portion 290c are connected. The space 280c between them is referred to as a body side third insertion/removal portion 280c, and the space 280d between the body side third claw portion 290c and the body side fourth claw portion 290d is referred to as a body side fourth insertion/removal portion 280d. These four spaces, namely, 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. As shown in FIG.

The lengths in the circumferential direction of the first body-side insertion/removal portion 280a to the fourth body-side insertion/removal portion 280d are different from each other. 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 longest. Shortest.
An angle β3 between a straight line connecting one end of the third body-side insertion/removal portion 280c and the optical axis O and a straight line connecting the other end of the third body-side insertion/removal portion 280c and the optical axis O is about 51 degrees. It is between 0 degrees and 52.0 degrees.
An angle β1 between a straight line connecting one end of the first body-side insertion/removal portion 280a and the optical axis O and a straight line connecting the other end of the first body-side insertion/removal portion 280a and the optical axis O is about 50 degrees. .0 degrees to 51.0 degrees.

An angle β4 between a straight line connecting one end of the fourth body-side insertion/removal portion 280d and the optical axis O and a straight line connecting the other end of the fourth body-side insertion/removal portion 280d and the optical axis O is approximately 46 degrees. It is between 0.5 and 46.5 degrees.
An angle β2 between a straight line connecting one end of the second body-side insertion/removal portion 280b and the optical axis O and a straight line connecting the other end of the second body-side insertion/removal portion 280b and the optical axis O is approximately 39 degrees. .0 degrees to 40.0 degrees.
Of course, the angles α1 to α4 of the four body side first claw portions 290a to the body side fourth claw portions 290d and the angles β1 to β4 of the four body side first insertion/removal portions 280a to the body side fourth insertion/removal portions 280d are The total value is 360 degrees.

The first body-side insertion/removal portion 280a is located above the third body-side straight line B3 and below the fourth body-side straight line B4, and the second body-side insertion/removal portion 280b is located above the third body-side straight line B3 and below the body. In the region above the fourth side straight line B4, the third body side insertion/removal portion 280c is located below the third body side straight line B3 and above the fourth body side straight line B4. They are arranged in regions below the third body-side straight line B3 and below the fourth body-side straight line B4.

The first body-side insertion/removal portion 280a and the third body-side insertion/removal portion 280c are arranged on the second body-side straight line B2 in substantially symmetrical regions with the optical axis O as the center. The second body-side insertion/removal portion 280b and the fourth body-side insertion/removal portion 280d are arranged on the first body-side straight line B1 and in substantially symmetrical regions with the optical axis O as the center.
As shown in FIG. 2, the center positions along the circumferential direction of the first body-side insertion/removal portion 280a to the fourth body-side insertion/removal portion 280d are the first body-side straight line and the second body-side straight line B2. do not overlap.

A body-side terminal holding portion 220 including a plurality of body-side terminals is provided inside the opening 212 of the body-side mount 210 . Body-side terminal holding portion 220 has an arcuate shape corresponding to the shape of annular body-side mount 210 . The body-side terminal holding part 220 is arranged on the inner peripheral side of the opening 212 of the body-side mount 210 and above the imaging element 270, and is arranged in the center of the upper part of the imaging element 270 as shown in FIGS. is preferred. In other words, the center in the circumferential direction of body-side terminal holding portion 220 is preferably positioned on first body-side straight line B1.

A body-side first claw portion 290 a is arranged on the upper right of the body-side terminal holding portion 220 , and a body-side second insertion/removal portion 280 b is arranged on the upper left of the body-side terminal holding portion 220 . Therefore, the angle between 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 the first body-side claw portion 290a. and the angle β2 of the body-side second insertion/removal portion 280b.

The body-side terminal holding portion 220 has a plurality of body-side terminals as described above. A 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 imaging element 270 . Each body-side terminal group is a conductive pin. The body-side terminal group is pushed in the -Z direction (FIG. 1) by a spring or the like (not shown).
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 and the direction toward the imaging device 270 .

The body-side mount 210 has a hole through which the lock pin 214 passes. The hole through which the lock pin 214 penetrates is arranged on the upper right side of the fourth body-side 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 arranged between the region where the fourth body-side claw portion 290d exists and the region where the first body-side claw portion 290a exists. be. The lock pin 214 is pushed in the -Z direction (subject side) by a spring or the like (not shown). The lock pin 214 can move in the +Z direction (toward the imaging element 270) against the biasing force of the spring by pressing an unlock button (not shown).

FIG. 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 (on the back side of 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 back side of the second body-side claw portion 290b), and a position corresponding to the third body-side claw portion 290c (second spring). A third plate spring 213c is provided on the back side of the third body side claw portion 290c), and a fourth plate spring is provided at a position corresponding to the fourth body side claw portion 290d (back side of the fourth body side claw portion 290d). 213d is provided.
In the following description, these four first to fourth leaf springs 213a to 213d are collectively referred to as leaf springs 213. As shown in FIG. The plate spring 213 is arranged on the imaging element 270 side surface of the body side claw portion 290 and presses the object side surface of the opposing lens side claw portion (described later) 390 toward the imaging element 270 side (+Z direction).

As shown in FIG. 4, the rear end portion 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 portion of the first leaf spring 213a in the mounting direction 44 (described later). placed. The second leaf spring 213b, the third leaf spring 213c, and the fourth leaf spring 213d are arranged around the optical axis O with the first leaf spring 213a as a starting point at intervals of approximately 90 degrees.

(Lens side mount 310)
5 and 6 are diagrams schematically showing the mount of the interchangeable lens 3 viewed from the camera body 2 side (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, indicated by a solid line in FIG. Up-down direction. Further, the lens-side second straight line L2 extending in the horizontal direction X of the interchangeable lens 3, indicated by a solid line in FIG. This is the left-right direction as seen from the

The first lens-side straight line L1 and the second lens-side straight line L2 are orthogonal to each other on the optical axis O (center) of the interchangeable lens 3 . As indicated by the one-dot chain lines in FIG. 4 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 and the first lens-side straight line L1 coincide, and the second body-side straight line B2 and the second lens-side straight line L2 are aligned. The body-side third straight line B3 and the lens-side fourth straight line L4 match, and the body-side fourth straight line B4 and the lens-side third straight line L3 match. It should be noted that even if the straight lines do not match perfectly, 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.

The mount of the interchangeable lens 3 includes the lens-side mount 310 and the lens-side terminal holding portion 320 described above with reference to FIG. The lens-side mount 310 is formed in an annular shape centered on the optical axis O of the interchangeable lens 3 and arranged along a plane perpendicular to the optical axis O. As shown in FIG. 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 plane 311 has an annular shape centered on the optical axis O and is arranged along a plane orthogonal to the optical axis O. As shown in FIG. On the rear end surface of the reference surface 311 in the direction of the optical axis O, a lock pin sliding surface 309 on which a lock pin 214 (to be described later) slides while being mounted extends in the -Z direction on a cross section along the Z direction. It is formed in a concave shape. The lock pin sliding surface 309 has an annular shape centered on the optical axis O and is arranged along a plane orthogonal to the optical axis O. As shown in FIG.

The lens-side mount 310 is fixed by screwing with screws 313 to a fixing member arranged inside the interchangeable lens 3 . When the lens side mount 310 is viewed from the camera body 2 side, the screws 313 are arranged around the optical axis O at intervals of approximately 90 degrees. The four screws 313 are arranged on the outer peripheries of four lens-side claw portions 390, which will be described later. The screws 313 are arranged on the outer periphery of both ends of the lens-side terminal holding portion 320 in the circumferential direction.

The lens-side mount 310 has a cylindrical portion 312 extending in the optical axis O direction from its inner peripheral edge (inner peripheral edge of the reference plane 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 located in a direction that protrudes toward the camera body 2 from the reference surface 311 . The lens-side mount 310 has a first lens-side claw portion 390a, a second lens-side claw portion 390b, and a third lens-side claw portion spaced apart from each other along the outer circumference of the rear end portion of the cylindrical portion 312 in the direction of the optical axis O. 390c, and a fourth lens-side claw portion 390d.
In the following description, these four protrusions, ie, the first lens-side claw portion 390a to the fourth lens-side claw portion 390d are collectively referred to as the lens-side claw portion 390. FIG.

The lens-side claw portion 390 is provided in a direction projecting from the outer peripheral edge portion of the cylindrical portion 312 of the lens-side mount 310 toward the outer peripheral direction of the lens-side mount 310 and is substantially orthogonal to the optical axis O. Further, the lens-side claw portion 390 extends in the circumferential direction with the optical axis O as the center. As shown in FIGS. 5 and 6, the first lens-side claw portion 390a is at the upper left position, the second lens-side claw portion 390b is at the upper right position, and the third lens-side claw portion 390c is at the lower right position. The fourth lens-side claw portion 390d is arranged at the lower left position. That is, the lens-side first claw portion 390a is located above the lens-side second straight line L2 and to the left of the lens-side first straight line L1, and the lens-side second claw portion 390b is located above the lens-side second straight line L2 and on the left side of the lens-side first straight line L1. In the region on the right side of the first lens-side straight line L1, the third lens-side claw portion 390c is located below the second straight line L2 on the lens side and on the right side of the first straight line L1 on the lens side. are arranged below the second lens-side straight line L2 and to the left of the first lens-side straight line L1.

In addition, the lens side first claw portion 390a and the lens side third claw portion 390c are formed on a line of the lens side third straight line L3 and are substantially symmetrical with respect to the optical axis O. 390b and the fourth lens-side claw portion 390d are arranged on the fourth lens-side straight line L4 in substantially symmetrical regions with the optical axis O as the center.
It should be noted that the third lens-side straight line L3 and the fourth lens-side straight line L4 do not necessarily pass through the center positions along the circumferential direction of the first lens-side claw portion 390a to the fourth lens-side claw portion 390d.

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

The lens-side claw portion 390 has a biased portion as a contact portion that is contacted by the plate spring 213 and biased in a direction away from the body-side claw portion 290 . As for the shape of the urged portion, it is sufficient that the lens-side claw portion 390 receives a sufficient urging force from the leaf spring 213, and the contact between the leaf spring 213 and the urged portion may be point contact, line contact, surface any contact. The shape and material of the plate spring 213 may be changed as appropriate as long as the lens-side claw portion 390 can be sufficiently pressed.

When the plate spring 213 of the body-side claw portion 290 and the lens-side claw portion 390 come into contact with each other, the lens-side claw portion 390 moves away from the body-side claw portion 290 along the optical axis O from the plate spring 213 (+Z direction). be pushed. By pressing the lens-side claw portion 390 in the +Z direction (imaging element 270 side), the lens-side mount 310 is pressed toward the body-side mount 210, and the attachment between the camera body 2 and the interchangeable lens 3 is stabilized.

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 length in the circumferential direction, and the length of the lens-side claw portion 390 in the circumferential direction can be pressed by the leaf spring 213. It can be changed as much as possible. In addition, when the interchangeable lens 3 is attached to the camera body 2, the entire surface of the lens-side claw portion 390 and the entire surface of the body-side claw portion 290 do not need to face each other. may be different from the positions of the circumferential ends of the body-side claw portions.
In addition, it is not necessary for the lens-side claw portion 390 and the body-side insertion/extraction portion 280 to have substantially the same length in the circumferential direction. It is sufficient if the length of the claw portion 390 in the circumferential direction is less than that.
Similarly, the body-side claw portion 290 and the lens-side insertion/extraction portion 380 do not need to have the same length in the circumferential direction. It is sufficient if the length of the claw portion 290 in the circumferential direction is less than that.

As shown in FIG. 6, the lengths in the circumferential direction of the first lens-side claw portion 390a to the fourth lens-side claw portion 390d are different. In addition, a straight 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 the circumference of the lens-side first claw portion 390a to the lens-side fourth claw portion 390d The angles formed by the straight line connecting the other end of the direction and the optical axis O are 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 longest. Shortest.
The angle α7 formed between a straight line connecting one end of the lens-side third claw portion 390c and the optical axis O and a straight line connecting the other end of the lens-side third claw portion 390c and the optical axis O is about 48.5 degrees. , between 48.0 and 49.0 degrees.
An angle α5 between a straight line connecting one end of the first lens-side claw portion 390a and the optical axis O and a straight line connecting the other end of the first lens-side claw portion 390a and the optical axis O is approximately 48 degrees. It is between 0.5 and 48.5 degrees.

An angle α8 between a straight line connecting one end of the fourth lens side claw portion 390d and the optical axis O and a straight line connecting the other end of the fourth lens side claw portion 390d and the optical axis O is approximately 44 degrees. .0 degrees to 45.0 degrees.
An angle α6 between a straight line connecting one end of the second lens-side claw portion 390b and the optical axis O and a straight line connecting the other end of the second lens-side claw portion 390b and the optical axis O is about 36 degrees. It is between 0.5 and 36.5 degrees.
An angle α6 formed by a straight line connecting one end of the second lens-side claw portion 390b and the optical axis O and a straight line connecting the other end of the second lens-side claw portion 390b and the optical axis O is a rotation angle described later. less than

The radial lengths (height of the claw portions) of the first lens-side claw portion 390a to the fourth lens-side claw portion 390d are substantially the same. Further, the lengths (thicknesses of the claw portions) in the direction of the optical axis O of the first lens-side claw portion 390a to the fourth lens-side claw portion 390d are substantially the same.

It should be noted that at least one of the lens side claw portions 390 may be partially notched as long as it does not affect the state of attachment to the camera body 2 . Even if a part of the lens-side first claw portion 390a is cut away, the entirety of the projected portion arranged in the region facing the body-side first claw portion 290a and the cut-out portion is It is referred to as a first claw portion 390a. The same applies to the other lens side second to fourth claw portions 390b to 390d. As for the method of notching, the lens-side first claw portion 390a may be notched so as to be divided into two or more parts in the circumferential direction, or the lens-side first claw portion 390a may be partially notched. At least part of the first lens-side claw portion 390a may be cut out so that the length in the radial direction is shortened. Therefore, the lens-side claw portion 390 may cut out a part of the lens-side third straight line L3 or the lens-side fourth straight line L4.
Also, the circumferential length of the lens-side first claw portion 390a may be changed within a range in which it passes through the corresponding body-side first insertion/removal portion 280a during insertion. The same applies to the second lens-side claw portion 390b, the third lens-side claw portion 390c, and the fourth lens-side claw portion 390d.
Furthermore, the thickness of the cylindrical portion 312 in the radial direction can be changed as appropriate, and the shape may be such that at least a portion of the cylindrical portion 312 protrudes radially inward from the cylindrical portion 312 of the present embodiment.

The lens-side claw portion 390 protrudes radially outward from the outer circumference of the cylindrical portion 312. On the outer circumference of the cylindrical portion 312, there are a portion where the lens-side claw portion 390 exists and a space where the lens-side claw portion 390 does not exist. there is a part

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

The lengths in the circumferential direction of the lens side first insertion/removal portion 380a to the lens side fourth insertion/removal portion 380d are different from each other. Specifically, the second lens side insertion/removal portion 380b is the longest, the first lens side insertion/removal portion 380a is the second longest, the fourth lens side insertion/removal portion 380d is the third longest, and the third lens side insertion/removal portion 380c is the longest. Shortest.
An angle β6 between a straight line connecting one end of the second lens-side inserting/removing portion 380b and the optical axis O and a straight line connecting the other end of the second lens-side inserting/removing portion 380b and the optical axis O is approximately 50 degrees. between 0.5 and 50.5 degrees.
An angle β5 between a straight line connecting one end of the lens side first insertion/removal portion 380a and the optical axis O and a straight line connecting the other end of the lens side first insertion/removal portion 380a and the optical axis O is approximately 45 degrees. between 0.5 and 45.5 degrees.

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

Further, the lens side first insertion/removal portion 380a and the lens side third insertion/removal portion 380c are arranged on the line of the lens side second straight line L2 and are substantially symmetrical with respect to the optical axis O. 380b and the fourth lens-side insertion/removal portion 380d are arranged in substantially symmetrical regions on the first lens-side straight line L1 with the optical axis O as the center.
Note that the first lens-side straight line L1 and the second lens-side straight line L2 do not necessarily pass through the center positions along the circumferential direction of the first lens-side insertion/removal portion 380a to the fourth lens-side insertion/removal portion 380d.

A lens-side terminal holding portion 320 including a plurality of lens-side terminals is provided inside the cylindrical portion 312 . The lens-side terminal holding portion 320 has an arcuate shape corresponding to the shape of the annular lens-side mount 310 . The lens-side terminal holding part 320 is arranged above 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 FIGS. In other words, the center of the lens-side terminal holding portion 320 in the circumferential direction is preferably positioned on the first lens-side straight line L1.

A lens-side first claw portion 390 a is arranged on the upper left of the lens-side terminal holding portion 320 , and a lens-side second inserting/extracting portion 380 b is arranged on the upper right of the lens-side terminal holding portion 320 . Therefore, the angle between 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 the first lens-side claw portion 390a. is smaller than the sum of the angle α5 of the second insertion/removal portion 380b on the lens side and the angle β6 of the second insertion/removal portion 380b on the lens side.

The lens-side terminal holding portion 320 has a plurality of lens-side terminals as described above. A plurality of lens-side terminals (referred to as a lens-side terminal group) are arranged in a line inside the lens-side mount 310 in the lens-side terminal holding portion 320 in an arc shape. The lens-side terminal group is arranged such that the conductive contact surfaces thereof are exposed in the +Z direction (FIG. 1).

All the contact surfaces of the plurality of lens-side terminals may be positioned in the +Z direction from the rear end of the lens-side claw portion 390 in the optical axis O direction, and -Z direction from the rear end of the lens-side claw portion 390 in the optical axis O direction. may be located in
Also, some of the contact surfaces of the plurality of lens-side terminals may be positioned in the +Z direction from the rear end of the lens-side claw portion 390 in the optical axis O direction, and the remaining contact surfaces may be located along the optical axis of the lens-side claw portion 390 . It may be positioned in the -Z direction from the rear end in the O direction.

The lens side mount 310 has a lock pin receiving portion 314 . As shown in FIGS. 5 and 6, the lock pin receiving portion 314 is arranged on the upper left of the fourth lens side claw portion 390d. That is, the lock pin receiving portion 314 corresponds to a portion of the lock pin sliding surface 309 of the lens side mount 310 that corresponds to the outer peripheral side of the first lens side claw portion 390a and the outer peripheral side of the fourth lens side claw portion 390d. It is placed between the parts that

The lock pin receiving portion 314 is a groove in which the lock pin 214 of the camera body 2 is received 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 lock release button of the camera body 2 is not pressed, the −Z direction end of the lock pin 214 (the front end on the subject side) is accommodated in the lock pin receiving portion 314 of the lens side mount 310 . Also, when the lock release button of the camera body 2 is pressed, the −Z direction end of the lock pin 214 is positioned in the +Z direction from the lock pin slide surface 309 . Therefore, when the interchangeable lens 3 and camera body 2 are relatively rotated while pressing the unlock button of the camera body 2 , the lock pin 214 does not contact the lock pin sliding surface 309 .

When the interchangeable lens 3 is attached to the camera body 2, the plurality of body-side terminals physically contact the corresponding plurality of lens-side terminals. This contact electrically connects the plurality of body-side terminals and the plurality of lens-side terminals. That is, the plurality of body-side terminals and the plurality of lens-side terminals are electrically connected.

As shown in FIG. 7, a limiting pin 315 is arranged between the reference surface 311 of the lens-side mount 310 and the fourth lens-side claw portion 390d in a direction protruding from the outer peripheral surface of the cylindrical portion 312. As shown in FIG. The restriction pin 315 is arranged on the rear end side of the fourth lens side claw portion 390d in the mounting direction 44 (position close to the third lens side claw portion 390c). A portion of the limiting pin 315 is arranged on the back side of the fourth lens-side claw portion 390 d when the fourth lens-side claw portion 390 d 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.

(How to attach the interchangeable lens 3 to the camera body 2)
Next, a method of attaching the interchangeable lens 3 to the camera body 2 will be described with reference to FIGS. 8 and 9. FIG. 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, so that the state of contact between the claw portions can be understood. be. 8 and 9 are views of the body side mount 210 and the lens side mount 310 viewed from the object side toward the imaging element 270 side (seen in the +Z direction). 5. Left and right are reversed from FIG.

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

The interchangeable lens 3 is rotated in the mounting direction 44 shown in FIG. 8 from the insertion position. The mounting direction 44 is a direction along the circumference of the optical axis O in a plane substantially orthogonal to the optical axis O. As shown in FIG. As the interchangeable lens 3 rotates, the body-side first claw portion 290a and the plate spring 213a enter the space between the lens-side first claw portion 390a and the reference surface 311 .

That is, the first lens-side claw portion 390a enters the first body-side claw portion 290a toward the imaging element 270 (+Z side), and the first lens-side claw portion 390a moves toward the imaging element 270 (+Z side) of the leaf spring 213a. Oppose. At the same time, the first body-side claw portion 290a and the plate spring 213a enter into the space between the first lens-side claw portion 390a and the reference surface 311 . Similarly, the second body-side claw portion 290b and the plate spring 213b enter the space between the second lens-side claw portion 390b and the reference surface 311, and the space between the third lens-side claw portion 390c and the reference surface 311 is closed. The third body-side pawl portion 290c and the plate spring 213c enter the space, and the fourth body-side pawl portion 290d and the plate spring 213d enter the space between the fourth lens-side pawl portion 390d and the reference surface 311. At this time, the lens-side terminal group contacts the body-side terminal group in order.
Although the interchangeable lens 3 is rotated with respect to the camera body 2 in the mounting direction 44 , the camera body 2 may be rotated with respect to the interchangeable lens 3 in the direction opposite to the mounting direction 44 .

FIG. 9 is a view of the interchangeable lens 3 rotated by a first angle in the mounting direction 44 with respect to the camera body 2 from the insertion position of FIG. The position of the interchangeable lens 3 at this time is called the mounting position. The first angle is approximately 40 degrees in this embodiment, and ranges from 38.5 degrees to 41.5 degrees.

At the mounting 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 with respect to the camera body 2 for removal. That is, when each body-side claw portion 290 and each lens-side claw portion 390 reaches the mounting position, the relative positions in the circumferential direction between the body-side mount 210 and the lens-side mount 310 are determined.

Also, the lens-side claw portion 390 is pushed toward the imaging device 270 (+Z direction) by the leaf spring 213 , and the reference surface 311 of the lens-side mount 310 contacts the reference surface 211 of the body-side mount 210 . The lens side mount 310 is in surface contact with the body side mount 210 and is biased by the plate spring 213, so that the interchangeable lens 3 and the camera body 2 are firmly attached.
At the mounting position, each of the plurality of lens-side terminals contacts and is electrically connected to each of the corresponding plurality of body-side terminals.

Also, the state from the state where each lens-side claw portion 390 in FIG. 8 is inserted into the corresponding body-side insertion/extraction portion 280 at the insertion position to immediately 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, the end of the lock pin 214 in the −Z direction comes into contact with the lock pin slide surface 309 of the lens side mount 310 during mounting.

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 . Therefore, the fixing screw for fixing the lens side mount 310 is not arranged in the first angular range from the lock pin receiving portion 314 of the lock pin sliding surface 309 in the direction opposite to the mounting direction 44 . By not arranging the fixing screw in the first angular range in the opposite direction, the −Z direction end of the lock pin 214 does not contact the fixing screw when sliding on the lock pin sliding surface 309, so that the sliding can be performed smoothly. The interchangeable lens 3 can be attached and detached.

(How to remove the interchangeable lens 3 from the camera body 2)
When the user presses an unlocking button (not shown) of the camera body at the mounting position, the lock pin 214 is retracted from the lock pin receiving portion 314 toward the image sensor 270 side. As a result, the rotation restriction of the interchangeable lens 3 with respect to the camera body 2 is released, and the lens side mount 310 can be rotated with respect to the body side mount 210 . When the interchangeable lens 3 is rotated in a direction (removal direction) opposite to the mounting direction 44 with respect to the camera body 2 while pressing a lock release button (not shown), each lens-side claw portion 390 moves toward each body-side claw portion 290. , to the position of each body-side insertion/removal portion 280, and reaches the insertion position shown in FIG.

(Description of over-rotation state in the mounting direction)
Next, referring to FIG. 10, an overrotation state in which the interchangeable lens 3 is rotated by the first angle or more in the mounting direction 44 with respect 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. The upper portion (a) of the one-dot chain line is from the subject side to the imaging device. 270 side, and the lower part of the dashed line (b) is a side view of the lens mount mechanism. When the interchangeable lens 3 is attached to the camera body 2, if the user rotates the interchangeable lens 3 in the attachment direction 44 while pressing the unlock button, the lock pin 214 does not enter the lock pin receiving portion 314 at the attachment position. Therefore, the interchangeable lens 3 can be further rotated with respect to the camera body 2 from the mounting position shown in FIG. When the interchangeable lens 3 is further rotated in the mounting direction 44 from the mounting position with respect to the camera body 2, the restriction pin 315 comes into contact with the rear end of the body-side fourth claw portion 290d in the mounting direction 44, and the interchangeable lens 3 is rotated. Further rotation with respect to the camera body 2 is prevented.

(Description of over-rotation in removal direction)
Next, referring to FIG. 11, an overrotation state in which the interchangeable lens 3 is rotated from the insertion position in a direction (removal direction) opposite to the mounting direction 44 with respect to the camera body 2 will be described. FIG. 11 is a side view of part of the lens mount mechanism in an overrotation state in the removal direction. Since the limiting pin 315 is arranged at the rear end portion of the fourth lens-side claw portion 390d in the mounting direction 44, when the user tries to rotate the interchangeable lens 3 in the reverse direction after inserting it into the camera body 2, the limiting pin 315 will be restricted. The pin 315 abuts on the tip of the body-side third claw portion 290c in the mounting direction 44 to prevent the interchangeable lens 3 from rotating further in the removal direction with respect to the camera body 2. As shown in FIG.

In this manner, the limit pin 315 abuts on the circumferential end of the body-side claw portion 290 to prevent both over-rotation in the mounting direction 44 and over-rotation in the removal direction. Since the restricting pin 315 prevents both overrotation in the mounting direction 44 and overrotation in the removal direction, two members, one for preventing overrotation in the mounting direction 44 and the other for preventing overrotation in the removal direction, are provided. No need to prepare.
In addition, since the limit pin 315 prevents over-rotation using the circumferential end of the body-side claw portion 290, there is no need to separately provide a member that contacts the limit pin 315 during over-rotation.

(Description of incorrect insertion state)
Next, an erroneous insertion state in which the user attempts to insert the interchangeable lens 3 into the camera body 2 at the wrong position without aligning the index of the interchangeable lens 3 with the index of the camera body 2 will be described. Since the lens side claw portion 390 does not pass through the body side insertion/extraction portion 280 in the erroneously inserted state, 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. different. 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, so that the state of contact between the claw portions can be understood. is. 12 and 13 are views of the body-side mount 210 and the lens-side mount 310 viewed from the object side toward the imaging device 270 (viewed in the +Z direction). 5. Left and right are reversed from FIG. As an example of the 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 deviated from the insertion position by 15 degrees in the removal direction. 13(a) to 13(c) show a state in which the index of the interchangeable lens 3 and the index of the camera body 2 are shifted by 90 from the insertion position.

FIG. 12 shows a state shifted by 15 degrees from the insertion position in the removal direction (first misinsertion state). As shown by hatching in FIG. 12, the lens side claw portion 390 abuts on the body side claw portion 290 at four portions indicated by symbols γ1 to γ4. That is, in the first erroneous insertion state, the lens-side claw portion 390 and the body-side claw portion 290 come into contact with each other at four points, thereby reliably preventing erroneous insertion.

FIG. 13A is a diagram showing a state in which the index of the interchangeable lens 3 and the index of the camera body 2 are deviated from the insertion position by approximately 90 degrees in the removal direction (second incorrect insertion state). 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 deviated from the insertion position by approximately 180 degrees in the removal direction. 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 deviated from the insertion position by approximately 270 degrees in the removal direction.

As shown in FIG. 13A, in the case of the second erroneous insertion state, the third lens-side claw portion 390c contacts the first body-side claw portion 290a with the portion indicated by symbol γ5, and the second body-side claw portion 290b , the portion indicated by .gamma.7 abuts against the body-side second insertion/removal portion 280b. Further, the first lens-side claw portion 390a cannot be inserted into the fourth body-side insertion/extraction portion 280d because the portion indicated by symbol γ6 contacts the fourth body-side claw portion 290d. Thus, in the second erroneous insertion state, the lens-side claw portion 390 abuts on the body-side claw portion 290 at three points to prevent erroneous insertion.

As shown in FIG. 13B, in the case of the third erroneous insertion state, the fourth lens-side claw portion 390d hits the first body-side claw portion 290a with the portion indicated by symbol γ8, thereby causing the second body-side insertion/removal. It cannot be inserted into portion 280b. Further, the lens-side first claw portion 390a cannot be inserted into the body-side first insertion/extraction portion 280a because the portion indicated by symbol γ9 hits the body-side third claw portion 290c. Thus, in the third erroneous insertion state, the lens-side claw portion 390 abuts on the body-side claw portion 290 at two points to prevent erroneous insertion.

As shown in FIG. 13C, in the case of the fourth erroneous insertion state, the first lens-side claw portion 390a contacts the first body-side claw portion 290a with the portion indicated by symbol γ10, and the second body-side claw portion 290b , and cannot be inserted into the body-side second insertion/removal portion 280b. Further, the lens-side third claw portion 390c cannot be inserted into the body-side fourth insertion/extraction portion 280d because the portion indicated by symbol γ12 contacts the body-side third claw portion 290c. Thus, in the fourth erroneous insertion state, the lens-side claw portion 390 abuts on the body-side claw portion 290 at three points to prevent erroneous insertion.

As described above, in an erroneous insertion state other than the insertion position, the lens side claw portion 390 abuts on the body side claw portion 290 in at least two places, so that the lens side claw portion 390 is in contact with the body side insertion/extraction portion at positions other than the insertion position. 280 is prohibited. Therefore, even if an attempt is made to mount the interchangeable lens 3 on the camera body 2 in an erroneous insertion position, erroneous insertion can be reliably prevented by contacting the claw portions at least at two locations.

In addition, one of the two or more contact points is positioned above the imaging device 270 in the first to fourth incorrect insertion states. That is, at the erroneous insertion position, any one of the first lens side claw portion 390a to the third lens side claw portion 390c abuts the end portion of the first body side claw portion 290a on the front end side in the mounting direction 44, and the lens side first claw portion This prevents the claw portion 390a to the third lens-side claw portion 390c from being inserted into the second body-side insertion/extraction portion 280b. As described above, the body-side terminal holding portion 220 is arranged inside the opening 212 of the body-side mount 210 and above the imaging device 270 . A first body-side claw portion 290 a is provided on the upper portion of the body-side terminal holding portion 220 , and the first body-side claw portion 290 a has the longest circumferential length among the four body-side claw portions 290 . In addition, a body side second insertion/removal portion 280 b is provided above the body side terminal holding portion 220 , and the body side second insertion/removal portion 280 b is the shortest among 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/extraction portion 280b at the normal insertion position, and the other lens side first claw portions 390a to 390b are inserted into the body side second insertion/extraction portion 280b. The third lens-side claw portion 390c is not erroneously inserted. Further, the first lens-side claw portion 390a to the third lens-side claw portion 390c do not enter the second body-side insertion/extraction portion 280b at an angle (inclined in a direction crossing the direction of the optical axis O). 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 erroneously inserted state. Further, the first body-side claw portion 290a prevents erroneous insertion by contacting one of the lens-side claw portions 390 in an erroneous insertion state. Among them, the length in the circumferential direction is the longest and the durability is high, so that the possibility that the first body-side claw portion 290a will be damaged at the time of erroneous insertion can be reduced. In addition, at least one of the abutting portions is positioned to face the body-side terminal holding portion 220 with the optical axis O interposed therebetween in the second to fourth erroneous insertion states. That is, one of the contact points is in the vicinity of 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 on the body side passing through the optical axis O. It is below the second straight line B2. Therefore, in the second to fourth erroneous insertion states, there are two or three abutment points, but since they abut on the upper and lower sides of the second body-side straight line B2 passing through the optical axis O, the possibility of erroneous insertion is reduced. can do.
In the first to fourth erroneous insertion states, one of the two or more contact points is positioned on the outer peripheral side of the lens-side terminal holding portion 320 . That is, at the erroneous insertion position, one of the first to fourth body-side claws 290a to 290d abuts the end portion of the first lens-side claw 390a on the front end side in the mounting direction 44. FIG. Therefore, erroneous insertion of the other body-side second to fourth claw portions 290b to 290d into the lens-side second insertion/extraction portion 380b is prevented. As described above, the upper portion of the lens-side terminal holding portion 320 has the end portion of the body-side first claw portion 290a on the tip side in the mounting direction 44 . This prevents the lens-side first claw portion 290a from passing through the body-side insertion/removal portions 280b to 280d other than the body-side first insertion/removal portion 280a and hitting the lens-side terminal holding portion 320 to damage the lens-side terminal. is doing. In addition, the first lens-side claw portion 390a hits one of the body-side claw portions 290 in an erroneously inserted state to prevent erroneous insertion. Secondly, the length in the circumferential direction is long and the durability is relatively high, so the possibility of the lens-side first claw portion 390a being damaged during erroneous insertion can be reduced.

Here, as shown in FIG. 8, the second lens-side claw portion 390b passes through the second body-side insertion/removal portion 280b and is disposed at the insertion position, and faces the second body-side claw portion 290b at the mounting position. The angle α6 (FIG. 6) of the lens-side second claw portion 390b is smaller than the angle β2 (FIG. 3) of the body-side second insertion/extraction 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 portion 390b smaller than the first angle, the body side second inserting/extracting portion 280b can be made smaller, so that the other lens side claw portions other than the lens side second claw portion 390b can be inserted in the incorrectly inserted state. 390 can be prevented from passing. In particular, in the second erroneous insertion state to the fourth erroneous insertion state in which there are two or three contact points between the lens side claw portion 390 and the body side claw portion 290, when the second erroneous insertion state to the fourth erroneous insertion state, other than the second lens side claw portion 390b It is possible to prevent the other lens-side claw portions 390a, 390c, and 390d from passing through the body-side second insertion/extraction portion 280b. Since the body-side terminal holding portion 220 is arranged on the inner diameter side of the body-side second insertion/extraction portion 290b, the other lens-side claw portions 390a, 390c, and 309d are prevented from passing through. It is also possible to prevent the lens-side claw portion 390 and the cylindrical portion 312 from hitting the body-side terminal holding portion 220 and damaging the body-side terminal.
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 insertion/extraction portion 280b 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.

According to the embodiment described above, 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 camera body 2 and the interchangeable lens 3 are attached, the four lens-side claws 390 are pressed in the +Z direction from the leaf springs 213 of the four body-side claws 290, respectively. Since there are four projecting portions (the lens-side claw portion 390 and the body-side claw portion 290), even if one of them receives an impact, the impact resistance is high.

Further, 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 respective terminals of the camera body 2 and the interchangeable lens 3. System 1 can be used properly.

The four protruding portions of the interchangeable lens 3 are arranged on a straight line that intersects the straight line connecting the center of the contact holding portion and the optical axis O at approximately 45 degrees on the optical axis O. The four plate springs 213 arranged at intervals of degrees are brought into contact with each other to face the four protruding portions of the camera body 2 . Thereby, the impact resistance is high even when the camera system 1 is held in the horizontal position as well as in the vertical position. In particular, even if either the interchangeable lens 3 or the camera body 2 is subjected to a vertical impact, the straight line (B1, L1) that connects the center of the contact holding portion and the optical axis O will have two points on the right and left sides of the straight line (B1, L1). Since the projecting portions are arranged one by one, the impact in the vertical direction can be received by two or more projecting portions.

A body-side second claw portion 290b and a body-side fourth claw portion 290d are arranged on a body-side third straight line B3, and a body-side first claw portion 290a and a body-side third claw portion are arranged on a body-side fourth straight line B4. 290c were arranged. Here, the angle α4 of the fourth body side claw portion 290d is the third largest among the four body side claw portions 290, and the angle α2 of the second body side claw portion 290b is the angle α2 of the four body side claw portions 290. Smallest angle (fourth largest). The angle α1 of the first body-side claw portion 290a is the largest among the four body-side claw portions 290, and the angle α3 of the third body-side claw portion 290c is the second largest angle among the four body-side claw portions. is large.

Therefore, when either the interchangeable lens 3 or the camera body 2 receives an impact in the vertical direction, the combination of the two upper protruding portions (the first body-side claw portion 290a and the second body-side claw portion 290b) and the , the force applied to the combination of the two lower protruding portions (the fourth body-side claw portion 290d and the third body-side claw portion 290c) becomes substantially equal. Even if an impact is received in the left-right direction, the combination of the two protrusions on the left (the third body-side claw 290c and the second body-side claw 290b) and the two protrusions on the right (the second body-side claw 290b) The force applied to the combination of the first claw portion 290a and the fourth body-side claw portion 290d) becomes substantially uniform.

A first lens-side claw portion 390a and a third lens-side claw portion 390c are arranged on a third lens-side straight line L3, and a second lens-side claw portion 390b and a fourth lens-side claw portion are arranged on a fourth lens-side straight line L4. 390d were placed. Here, the angle α8 of the fourth lens side claw portion 390d is the third largest among the four lens side claw portions 390, and the angle α6 of the second lens side claw portion 390b is the angle α6 among the four lens side claw portions 390. Smallest angle (fourth largest). The angle α5 of the first lens-side claw portion 390a is the second largest among the four lens-side claw portions, and the angle α7 of the third lens-side claw portion 390c is the largest among the four lens-side claw portions. big.

Therefore, when either the interchangeable lens 3 or the camera body 2 receives an impact in the vertical direction, the combination of the two upper projecting portions (the lens-side first claw portion 390a and the lens-side second claw portion 390b) , the force applied to the combination of the two lower projecting portions (the lens-side fourth claw portion 390d and the lens-side third claw portion 390c) becomes substantially uniform. Even if an impact is received in the left-right direction, the combination of the two protrusions on the left side (the first lens-side claw 390a and the fourth lens-side claw 390d) and the two protrusions on the right (the lens-side fourth claw 390d) The force applied to the combination of the three claw portions 390c and the second lens-side claw portion 390b) becomes substantially uniform.

Further, in the present embodiment, between the lens-side first claw portion 390a and the lens-side third claw portion 390c arranged on the lens-side third straight line L3, the angle of the lens-side third claw portion 390c is larger than that of the lens-side third claw portion 390c. Between the lens side second claw portion 390b and the lens side fourth claw portion 390d arranged on the side fourth straight line L4, the lens side fourth claw portion 390d has a larger angle. That is, of the two lens-side claw portions 390 facing each other across the optical axis O, the two lens-side claw portions 390 below the second lens-side straight line L2 (horizontal direction) are larger. Therefore, when the camera system is held in a horizontal position, the two lens-side claws 390 with a large angle below the second lens-side straight line L2 absorb the impact received from below on the interchangeable lens 3 with a large area. Can receive. When the interchangeable lens 3 receives an impact from below while the camera system is held horizontally, the lens-side claw portion 390 below the second lens-side straight line L2 approaches the body-side claw portion 290. Receive an impact in the direction (-Z direction). Here, the plate spring 213 presses the lens-side claw portion 390 in the direction away from the body-side claw portion 290 (+Z direction). Therefore, even if the interchangeable lens 3 receives an impact from below while the camera system is held in a horizontal position, the lens-side claw portion 390 below the second lens-side straight line L2 has a large area and , and the urging force of the plate springs 213 of the body-side claw portions 290 facing each other can absorb the impact, so that the impact resistance is high.

With the interchangeable lens 3 attached to the camera body 2 , the lens-side terminal holding portion 320 is arranged above the imaging element 270 . When the camera system 1 is held in a horizontal position, the sunlight incident on the interchangeable lens 3 is incident on the lower side of the interchangeable lens 3 on the emission side. In the embodiment, since the lens-side terminal holding portion 320 is arranged above the imaging element 270 instead of below it, ghosts can be suppressed.

The four leaf springs 213 are arranged around the optical axis O at intervals of approximately 90 degrees. Therefore, at least two leaf springs 213 of the four leaf springs 213 across the optical axis O come into contact with the two lens-side claws 390, 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 claw portions 390, but even if one of the four lens-side claw portions 390 of the interchangeable lens 3 is damaged, Since at least two lens-side claw portions 390 are arranged at positions opposed to each other with the optical axis O therebetween, they are pressed by two leaf springs 213 arranged at positions opposite each other with the optical axis O therebetween. Therefore, it is possible to provide the camera system 1 in which the interchangeable lens 3 can be attached to the camera body 2 in a usable state even if the lens-side claw portions 390 of the interchangeable lens 3 are damaged and the number thereof becomes insufficient. .
Further, since the leaf spring 213 is on the straight line B5 (FIG. 4), the lens side terminals near the straight line B5 can be strongly pressed against the body side terminals.

The following modifications are also possible, and it is also possible to combine one or more modifications with the above-described embodiment.
(Modification)

A configuration in which one of the four lens-side claw portions 390 is removed and three lens-side claw portions are provided may be employed. Even with three lens-side claws, the leaf springs 213 of the camera body 2 are arranged at intervals of 90 degrees around the optical axis O, so the lens-side claws are pressed by at least three leaf springs 213 and can be used. can be worn in any condition.

Two of the four lens-side claw portions 390 that face each other across the optical axis O may be removed, and two lens-side claw portions that face each other across the optical axis O may be provided. Even the two lens-side claws face each other across the optical axis O, and the plate springs of the camera body 2 are arranged at intervals of 90 degrees around the optical axis, so at least they face each other across the optical axis O. The leaf spring 213 presses the lens-side claw portion so that the lens can be mounted in a usable state. Note that in the case where two lens-side claw portions facing each other across the optical axis O are provided, one of the two lens-side claw portions is arranged at a position near the center of the lens-side terminal holding portion 320. is preferred. By arranging the lens claw portion at a position near the center of the lens-side terminal holding portion 320 and bringing it into contact with the plate spring 213, the lens-side terminal and the body-side terminal can be brought into contact with each other so that the camera system 1 can be properly used. can.

The material of the lens side mount 310 is not particularly limited, and may be metal or resin. At least a part of the end of the lens side mount 310 (the outer peripheral side end of the lens side claw portion 390, the circumferential end of the lens side claw portion 390, the optical axis O direction end of the cylindrical portion 312, etc.) is inclined. may be formed by The end of the lens-side mount 310 may not be inclined, and may have a step.

The shape of the lens-side terminal holding portion 320 is not particularly limited, and can be changed as appropriate. In particular, by inclining the end of the lens-side terminal holding portion 320 in the circumferential direction, it is possible to make smooth contact with the body-side terminal holding portion 220 when rotating from the insertion position to the mounting 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 terminal within the range where the interchangeable lens 3 contacts the body-side terminals when the interchangeable lens 3 is attached to the camera body 2 is determined. can be shifted.

The center position and length of the lens-side claw portion 390 in the circumferential direction can be appropriately changed within the range of being pressed by the plate spring 213 at the mounting position. The center position in the circumferential direction of the lens-side claw portion 390 and the center position in the circumferential direction of the biased portion may be arranged at different positions. That is, the position where the lens-side claw portion 390 is pressed from the center position of the plate spring 213 in the circumferential direction may be a position different from the center position of the lens-side claw portion 390 in the circumferential direction. Similarly, the circumferential center position of the lens-side claw portion 390 and the circumferential center position of the body-side claw portion 290 do not have to coincide at the mounting position. Also, the circumferential length of the lens-side claw portion 390 and the circumferential length of the corresponding body-side claw portion 290 do not have to match.

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, it may be a teleconverter, a wide converter, or a close-up ring that is mounted between the camera body 2 and the interchangeable lens 3 to change the focal length of the interchangeable lens 3 . Alternatively, it can be applied to a mount adapter or the like that enables attachment of an accessory including an interchangeable lens 3 of a mount standard other than the mount standard of the camera body 2 described above. In other words, it can be applied to any accessory as long as it is attached to the mount of the camera body 2 for use. In that case, the lens-side claw portion, the lens-side terminal, and the like correspond to the accessory-side projecting portion, the accessory-side terminal, and the like of each accessory.

In the above-described embodiment, the accessory is detachable from the camera body 2, but the camera body 2 is a mount adapter that enables the interchangeable lens 3 of the mount standard described above to be attached to a camera body different from the mount standard described above. The mount adapter may be configured so that the accessories described above can be mounted thereon.

Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other aspects conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 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 holding part 270... Image sensor 290 Body-side claw portion 309 Sliding surface for lock pin 310 Lens-side mount 311 Reference surface 312 Cylindrical portion 320 Lens-side terminal holding portion 360 Imaging optical system 390 ...Lens side claw portion, 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 (14)

A camera body to which an accessory having a lens, an accessory-side mount, and an accessory-side terminal can be attached and detached,
a body-side mount having an annular shape centered on the optical axis of the lens and being in contact with the accessory-side mount;
a body-side terminal group including a plurality of body-side terminals that come into contact with the accessory-side terminals when the accessory is attached;
a first body-side projecting portion projecting from the body-side mount toward an inner peripheral direction of the body-side mount and extending in a circumferential direction about the optical axis;
a second body-side projecting portion projecting from the body-side mount toward an inner peripheral direction of the body-side mount and extending in a circumferential direction about the optical axis;
a third body-side protrusion projecting from the body-side mount toward an inner peripheral direction of the body-side mount and extending in a circumferential direction about the optical axis;
a fourth body-side projecting portion projecting from the body-side mount toward an inner peripheral direction of the body-side mount and extending in a circumferential direction about the optical axis;
a first elastic member disposed on the image side of the first body-side projecting portion;
a second elastic member disposed on the image side of the second body-side projecting portion;
a third elastic member disposed on the image side of the third body-side projecting portion;
a fourth elastic member disposed on the image side of the fourth body-side projecting portion;
with
the first elastic member and the third elastic member are arranged at positions facing each other across the optical axis;
A camera body in which the second elastic member and the fourth elastic member are arranged at positions opposed to each other with the optical axis interposed therebetween. The second body-side projecting portion and the fourth body-side protrusion are arranged on a body-side third straight line that intersects the optical axis at approximately 45 degrees with the first body-side straight line extending in the vertical direction through the optical axis when held in the lateral position. wherein said first body-side projecting portion and said third body-side projecting portion are arranged on a body-side fourth straight line perpendicular to said body-side third straight line at said optical axis. 1. The camera body according to 1. 2. At least one of the center in the circumferential direction of the first body-side projecting portion and the center in the circumferential direction of the third body-side projecting portion is arranged at a position different from the fourth body-side straight line. Or the camera body according to 2. 2. At least one of the center of the second body-side projecting portion in the circumferential direction and the center of the fourth body-side projecting portion in the circumferential direction is arranged at a position different from the third body-side straight line. 4. A camera body according to any one of claims 3 to 4. The first body-side protrusion, the second body-side protrusion, and the third body-side protrusion are divided into four areas divided by the first body-side straight line and the second body-side straight line perpendicular to the optical axis. and the fourth body-side projecting portion are arranged respectively,
5. The camera body according to any one of claims 1 to 4, wherein the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member are arranged in the four areas, respectively. . A straight line connecting one end of the first body-side protrusion in the circumferential direction and the optical axis and a straight line connecting the other end of the first body-side protrusion in the circumferential direction and the optical axis 1 center angle, a straight line connecting one end of the second body-side protrusion in the circumferential direction and the optical axis, and a straight line connecting the other end of the second body-side protrusion in the circumferential direction and the optical axis. a second central angle formed by a straight line, a straight line connecting one end of the third body-side protrusion in the circumferential direction and the optical axis, the other end of the third body-side protrusion in the circumferential direction, and the a third central angle formed by a straight line connecting the optical axis, a straight line connecting one end of the fourth body-side protrusion in the circumferential direction and the optical axis, and the circumferential direction of the fourth body-side protrusion; 6. The camera according to any one of claims 1 to 5, wherein at least one of the fourth central angles formed by the straight line connecting the other end of the camera and the optical axis is different from the other central angles. body. A straight line connecting one end of the first body-side protrusion in the circumferential direction and the optical axis and a straight line connecting the other end of the first body-side protrusion in the circumferential direction and the optical axis One central angle is defined by a straight line connecting one end of the third body-side protrusion in the circumferential direction and the optical axis, and a straight line connecting the other end of the third body-side protrusion in the circumferential direction and the optical axis. larger than the third central angle with a straight line,
The third central angle is defined by a straight line connecting one end of the fourth body-side protrusion in the circumferential direction and the optical axis, the other end of the fourth body-side protrusion in the circumferential direction, and the optical axis. larger than the fourth central angle formed with the straight line connecting
The fourth center angle is defined by a straight line connecting one end of the second body-side protrusion in the circumferential direction and the optical axis, the other end of the second body-side protrusion in the circumferential direction, and the optical axis. 7. The camera body according to any one of claims 1 to 6, wherein the camera body is larger than a second central angle formed with a straight line connecting . From the insertion position where each of the first body-side protrusion to the fourth body-side protrusion is inserted between a plurality of accessory-side protrusions, the first body-side protrusion to the fourth body-side protrusion is inserted. Rotate at a first angle in a first direction within a plane substantially orthogonal to the optical axis at a predetermined position on the optical axis to a mounting position where each of the plurality of accessory-side protrusions faces a corresponding accessory-side protrusion. 8. The camera body according to any one of claims 1 to 7, wherein the accessory is attached by pressing the camera body. At an incorrect insertion position different from the insertion position in the circumferential direction, one of the first body side protrusion, the second body side protrusion, the third body side protrusion, and the fourth body side protrusion 9. The camera body of claim 8, wherein at least two abut at least two of the plurality of accessory-side projections. At an incorrect insertion position different from the insertion position in the circumferential direction, one of the plurality of accessory-side protrusions faces the first body-side protrusion positioned above the body-side terminal group. 10. A camera body according to claim 8 or 9. At an erroneous insertion position different from the insertion position in the circumferential direction, the accessory-side protrusions closest to the center of the accessory-side terminal are the first body-side protrusion, the second body-side protrusion, and the third body-side protrusion. 11. The camera body according to any one of claims 8 to 10, facing at least one of the body-side projecting portion and the fourth body-side projecting portion. The body-side inserting/removing portion disposed between the first body-side projecting portion and the second body-side projecting portion has a straight line connecting the one end in the circumferential direction and the optical axis and the other end in the circumferential direction. 12. The camera body according to any one of claims 8 to 11, wherein a central angle formed by a straight line connecting the optical axis and the optical axis is smaller than the first angle. The body-side terminal group is
13. The image pickup device according to any one of claims 1 to 12, which has a rectangular shape having an upper side, a lower side, and a right side and a left side when held in a horizontal position, and is arranged in an arc shape above the upper side of the imaging device on which subject light is incident. A camera body according to item 1. 14. The camera body according to any one of claims 1 to 13, wherein said accessory is an interchangeable lens.

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