JP7293615B2 - Mounts, lens barrels, imaging devices and imaging systems - Google Patents

Description

Application of Patent Act Article 30, Paragraph 2 https://events.jp posted on August 2, 2018 imaging. Nikon. com/live/jp/ (“Nikon | New Products Global Launch Event”) (Certificate A for application of exception to lack of novelty of invention (hereinafter referred to as certificate A)) 2018 http://www.posted Aug. 23. Nikon-image. com/products/mirrorless/lineup/z_7/ (“Z7 Overview|Mirrorless Cameras|Nikon Imaging”), http://www. Nikon-image. com/products/mirrorless/lineup/z_6/ (“Z6 Overview|Mirrorless Cameras|Nikon Imaging”), http://www. Nikon-image. com/products/mirrorless/common2/pdf/Z7Z6. pdf (“Z7Z6.pdf”), http://www. Nikon-image. com/products/mirrorless/common2/pdf/Z_series_Content. pdf (“Z_series_Content.pdf”), http://www. Nikon-image. com/sp/mirrorless_z/#products (“Full size mirrorless Z special content | Nikon imaging”), https://www. youtube. com/watch? v=fo2UFfEbtvY (Nikon Imaging Japan official channel “Nikon Z7: Product Tour”) (see certificate A) https://www. youtube. com/watch? time_continue=5&v=cDT9DQgNdMA (Nikon Imaging Japan official channel "Z Series Design Concept Movie"), https://www. youtube. com/watch? v=G46Y3degCM8 (Nikon Imaging Japan Official Channel "Z Series Engineer Interview Movie (Mount)") (See Certificate A) August 23, 2018 (Japan, United States), August 28, 2018 (Republic of Korea) ), and full-size mirrorless cameras “Z7” and “Z

Application of Article 30, Paragraph 2 of the Patent Act Z6” (See Certificate B for application of exception to loss of novelty of invention (hereinafter referred to as Certificate B)) September 1, 2018 Nikon Fan Meeting 2018 held on Sunday (see certificate B) Nikon Z mount system booklet distributed on September 1, 2018 (http://www.nikon-image.com/ posted on August 23, 2018) products/mirrorless/common2/pdf/Z_series_Content.pdf (paper version of “Z_series_Content.pdf”) (see certificate B) Prior exhibition held on September 14, 2018 (see certificate B) 2018 Photokina held on September 26 (see Certificate B) September 28, 2018, sold in Japan (Certificate C for application of exceptions to loss of novelty of invention (See certificate C)) September, October 2018, worldwide sales (see certificate C)

The present invention relates to mounts, lens barrels, imaging devices, and imaging systems.

Conventionally, a bayonet mount system in which claws are engaged by rotation has been widely used as a system for attaching and detaching an interchangeable lens to a camera body (see, for example, Patent Document 1 below). However, there is a demand for further improving the impact resistance of mounting the camera body and the interchangeable lens.

JP 2015-060076 A

A first mount disclosed in the present application is a lens mirror having a first surface, a cylindrical portion provided in a direction intersecting the first surface, and a lens-side projecting portion radially projecting from the cylindrical portion. A camera body mount to which a barrel can be attached, comprising: an annular portion with which the first surface contacts when the lens barrel is attached to the camera body; a body-side protruding portion that protrudes inward from an inner periphery of the annular portion and that contacts the lens-side protruding portion; and a fixing member that fixes the annular portion to the camera body, The projecting portion has a first portion that contacts the lens-side projecting portion when the lens barrel is attached to the camera body, and a second portion that does not contact the lens-side projecting portion. The distance from the first portion is greater than the distance between the fixing member and the second portion, and a plurality of the body-side projecting portions and the fixing member are arranged along the circumferential direction of the annular portion. In the body-side protruding portion, the second portion and the first portion are arranged in order along the circumferential direction, and in all the body-side protruding portions, the distance between the fixing member and the first portion is greater than the distance between the fixing member and the second portion ;

A second mount disclosed in the present application is a mount for a camera body to which a lens barrel is attachable and detachable, comprising: an annular portion having an annular shape; a fixing member for fixing the annular portion to the camera body; a body-side projecting portion projecting inward from the inner circumference of the annular portion, wherein the body-side projecting portion includes a first portion and the annular portion along the circumferential direction of the inner circumference. a second portion having a smaller thickness in a direction along the central axis than the first portion, wherein the distance between the fixing member and the first portion is greater than the distance between the fixing member and the second portion. Largely, a plurality of the body-side projecting portions and the fixing member are arranged along the circumferential direction of the annular portion. The first portions are arranged in order, and the distance between the fixing member and the first portion is greater than the distance between the fixing member and the second portion in all the body-side protrusions.

A third mount disclosed in the present application is a mount for a lens barrel attachable to a camera body having a first surface and a body-side protrusion provided along the first surface, the mount comprising at least one a main body having a lens therein; a second surface arranged at one end of the main body and contacting the first surface when mounted on the camera body; and fixing the second surface to the main body. a fixing member; and a lens-side protrusion facing the body-side protrusion when attached to the camera body, wherein the lens-side protrusion faces the body side when the lens barrel is attached to the camera body. It has a first portion in contact with the protrusion and a second portion separated from the body-side protrusion, wherein the first portion is further away from the fixing member than the second portion.

FIG. 1 is an external view of an imaging system according to a first embodiment; FIG. FIG. 2 is an external view of the camera-side mount according to the first embodiment; 3A and 3B are explanatory diagrams illustrating a support state of the leaf spring in the second annular portion according to the first embodiment. FIG. FIG. 4 is an exploded perspective view of the lens barrel according to the first embodiment; FIG. 5 is an external view of the lens-side mount according to the first embodiment; FIG. 6 is a partially enlarged view of the camera-side mount according to the first embodiment; FIG. 7 is an explanatory view showing an example of attaching the lens-side mount to the camera-side mount according to the first embodiment. FIG. 8 is a plan view showing a mounting state of the lens-side mount to the camera-side mount. FIG. 9 is a partially enlarged view of the lens-side mount according to the second embodiment. 10A and 10B are explanatory diagrams illustrating an example of attaching the lens-side mount to the camera-side mount according to the second embodiment.

<Appearance of imaging system>
FIG. 1 is an external view of an imaging system 1 according to the first embodiment. For ease of explanation and understanding, an XYZ orthogonal coordinate system is provided. In this coordinate system, the X plus direction is the direction toward the left side as seen from the photographer at the camera position (hereinafter referred to as normal position) when the photographer takes a horizontally long image with the optical axis OA, which is the Z direction, horizontal. do.

Also, the upward direction in the normal position is the Y plus direction. Further, the direction toward the object in the normal position is defined as the Z plus direction. The negative Z direction is the direction in which the lens barrel 20 is brought closer when attached to the camera body 10 , and the positive Z direction is the direction in which the lens barrel 20 is moved away when detached from the camera body 10 .

In FIG. 1, an imaging system 1 includes a camera body 10 and a lens barrel 20. As shown in FIG. The camera body 10 is, for example, a digital camera that includes an imaging section (image sensor) that captures a subject image formed by the lens barrel 20 .

The camera body 10 has a camera-side mount 30. - 特許庁The camera-side mount 30 is a mount for the camera body 10 to which the lens barrel 20 is detachably attached. The camera-side mount 30 has an opening 100 that exposes the imaging section in the camera body 10 and a camera-side claw portion 33 formed on the edge of the opening 100 . The camera body 10 is made of metal or resin. The camera-side mount 30 is also made of metal or resin, and may be made of the same material as or different from that of the camera body 10 .

The lens barrel 20 includes a barrel body 21 , a lens 22 and a lens side mount 40 . The lens barrel main body 21 is a cylindrical housing that accommodates the lens 22 inside. The lens 22 is an optical member that refracts subject light to form a subject image. The lens side mount 40 is a mount for the lens barrel 20 that mechanically couples with the camera side mount 30 . The lens-side mount 40 is provided at the end of the lens barrel main body 21 on the optical axis OA (that is, the negative side in the Z direction). The lens side mount 40 has a lens side claw portion 43 and a groove portion 44 for fitting the camera side claw portion 33 .

The camera-side mount 30 and the lens-side mount 40 constitute a bayonet mount type mount structure. Here, the camera-side mount 30 will be further described with reference to FIGS. 2 and 3. FIG. Details of the lens side mount 40 will be described later with reference to FIGS.

<Camera side mount>
FIG. 2 is an external view of the camera-side mount 30 according to the first embodiment. Specifically, FIG. 2A is an exploded perspective view of the camera-side mount 30, and FIG. 2B is a front view of the camera-side mount 30. As shown in FIG. The camera-side mount 30 is composed of a first annular portion 30A and a second annular portion 30B. The first annular portion 30A is an area around the opening 100 of the front surface 10a of the camera body 10. As shown in FIG.

A screw hole 35A is provided on the surface 31 of the first annular portion 30A in the Z plus direction. The screw holes 35A are provided, for example, at four locations substantially evenly in the circumferential direction of the surface 31 of the first annular portion 30A.

A recessed portion 201 recessed in the negative Z direction is provided on the surface 31 of the first annular portion 30A. For example, four recesses 201 are provided on one end side of the screw hole 35A in the circumferential direction of the surface 31 of the first annular portion 30A. The concave portion 201 is curved along the circumferential direction of the opening 100 on the surface 31 of the first annular portion 30A. A leaf spring 202 having an urging force directed in the negative Z direction is arranged in the recess 201 . A projecting piece 201a for fixing the position of one end of the plate spring 202 is provided at one end of the recess 201 on the side of the screw hole 35A. A projecting piece 201b for fixing the radial position of the other end of the leaf spring 202 is provided at the other end of the recess 201 on the side of the screw hole 35A.

The leaf spring 202 is an elongated elastic body along the tangential direction of the opening 100 . The leaf spring 202 is an elastic body that is convexly curved in the Z-minus direction, and biases the lens-side claw portion 43, which will be described later, in the Z-minus direction. One end of the plate spring 202 is formed with a hole 202a with which the projecting piece 201a is engaged. The hole 202a is circular when viewed from the Z direction. Further, the other end of the plate spring 202 is formed with a hole 202b with which the other end of the projecting piece 201b is engaged. The hole 202b is a U-shaped groove when viewed from the Z direction. The position of the leaf spring 202 in the Z direction is fixed by being sandwiched between the first annular portion 30A and the second annular portion 30B.

The Z plus direction surface of the second annular portion 30B is the camera-side mount reference surface 32 . The camera-side mount reference surface 32 is a portion that comes into contact (surface contact) with the lens-side mount reference surface 41 a of the lens barrel 20 when the lens barrel 20 is attached to the camera body 10 . The camera-side mount reference surface 32 is a substantially annular plane.

The second annular portion 30B has a camera-side claw portion 33 on its inner peripheral edge. The camera-side claw portion 33 is a portion that faces the lens-side claw portion 43 provided on the lens-side mount 40 of the lens barrel 20 when the lens barrel 20 is attached to the camera body 10 . The camera-side claw portion 33 has a predetermined thickness in the Z direction and is formed in a substantially plate shape. The thickness of the camera-side claw portion 33 will be described later with reference to FIG.

The camera-side claw portion 33 protrudes radially inward from the inner circumference of the camera-side mount 30 . The camera-side claw portion 33 is formed to have a predetermined length along the inner peripheral edge of the camera-side mount 30 . Four camera-side claw portions 33 are provided along the inner peripheral edge of the camera-side mount 30 . Each camera-side claw portion 33 is provided along the inner peripheral edge of the camera-side mount 30 at regular intervals. The circumferential length of each camera-side claw portion 33 can be changed as appropriate, and the circumferential distance between the camera-side claw portions 33 can also be changed as appropriate.

3A and 3B are explanatory diagrams showing an arrangement state of the leaf spring 202 in the second annular portion 30B according to the first embodiment. A housing portion 301 is provided in the camera-side claw portion 33 on the rear surface 300 of the second annular portion 30B. For example, four accommodation portions 301 are provided on the rear surface 300 of the second annular portion 30B so as to face the recesses 201 formed on the surface 31 of the first annular portion 30A. The accommodation portion 301 is formed along the circumferential direction of the opening 100 on the back surface 300 of the second annular portion 30B.

The leaf spring 202 is accommodated in the accommodation portion 301 . Specifically, for example, when the leaf spring 202 is urged in the Z-plus direction, the end of the leaf spring 202 engaged with the hole 202b moves toward the opening 100 while engaging with the protruding piece 201b. Extending in the circumferential direction, the end of the leaf spring 202 contacts the wall of the housing portion 301 that is present in the circumferential direction of the opening 100 . Further, the hole 202a of the leaf spring 202 is fixed in position by engaging with the projecting piece 201a. As a result, both ends of the leaf spring 202 are supported in the accommodating portion 301 so as not to move in the Z direction while expanding and contracting in the circumferential direction of the opening 100 . The intermediate portion of the leaf spring 202 is curved toward the surface 31 of the first annular portion 30A and is therefore out of contact with the housing portion 301 .

When the lens-side claw portion 43 enters a position facing the camera-side claw portion 33 and abuts against the plate spring 202, the curved middle portion of the plate spring 202 resists the urging force thereof and contacts the second annular portion 30B. pushed towards. As a result, the projecting pieces 201a and 201b of the recess 201 move relative to the holes 202a and 202b of the plate spring 202, and the plate spring 202 is elastically deformed.

On the other hand, when the lens-side claw portion 43 is out of contact with the plate spring 202, the intermediate portion of the plate spring 202 returns toward the surface 31 of the first annular portion 30A due to its urging force. As a result, the projecting pieces 201a and 201b of the recess 201 move relative to the holes 202a and 202b of the plate spring 202, and the plate spring 202 is elastically deformed.

A hole 35B is provided at a position corresponding to the screw hole 35A on the camera-side mount reference surface 32 of the second annular portion 30B. The hole 35B has a shape that allows the screw 36 inserted into the screw hole 35A to pass therethrough. By passing the screw 36 through the hole 35B and screwing it into the screw hole 36A, the second annular portion 30B is screwed to the camera body 10 via the first annular portion 30A.

The opening 100 is a circular hole that accommodates part of the lens mount 40 when the lens barrel 20 is attached to the camera body 10 . The opening 100 is formed with the inner diameter of the second annular portion 30B and is provided on the inner peripheral side of the camera-side mount 30 .

1 and 2, the camera-side mount 30 has a screw 36 and a mount positioning pin 37. As shown in FIG. The camera-side mount 30 is screwed to the camera body 10 with screws 36 that pass through the holes 35B and are inserted into the screw holes 35A.

The mount positioning pin 37 is a pin that protrudes or is accommodated with respect to the camera-side mount reference surface 32 . The mount positioning pin 37 has a protruding position where the tip in the Z plus direction protrudes from the camera side mount reference plane 32 and an accommodation position where the tip in the Z plus direction is accommodated on the Z minus direction side of the camera side mount reference plane 32. configured to be movable between

Further, as shown in FIG. 1, an unlock button 38 is provided near the camera side mount 30 on the front surface 10a (object side) of the camera body 10. As shown in FIG. The lock release button 38 is a button for moving the mount positioning pin 37 from the projecting position to the retracted position.

Further, as shown in FIG. 2A, the mount positioning pin 37 is biased to the projecting position by a spring 37a provided inside the camera body 10. As shown in FIG. When the lock release button 38 is pushed, the mount positioning pin 37 moves to the accommodation position against the biasing force of the spring 37a. When the lock release button 38 is released, the mount positioning pin 37 moves to the projecting position due to the biasing force of the spring 37a.

<Lens side mount>
Next, the lens side mount 40 will be described in detail with reference to FIGS. 4 and 5. FIG.

FIG. 4 is an exploded perspective view of the lens side mount 40 according to the first embodiment. FIG. 5 is an external view of the lens side mount 40 according to the first embodiment. The lens side mount 40 is composed of a base member 40A and an annular member 40B. FIG. 5A shows a front view of only the base member 40A. The annular member 40B is attached to the base member 40A. FIG. 5B shows a front view of the lens barrel 20 viewed from the Z plus direction.

The base member 40A has a flange 41 and a lens-side mount tube portion 42. As shown in FIG. The flange 41 is provided at the lens barrel body 21 side end portion of the lens side mount barrel portion 42 and is screwed to the lens barrel body 21 by inserting a screw 46 . The surface of the flange 41 on the negative Z direction side is a lens-side mount reference surface 41a.

The lens-side mount reference surface 41 a is a portion that contacts the camera-side mount reference surface 32 of the camera body 10 when the lens barrel 20 is attached to the camera body 10 . Like the camera-side mount reference surface 32, the lens-side mount reference surface 41a has a substantially annular shape.

The lens side mount tube portion 42 is provided on the inner peripheral side of the lens side mount reference surface 41a. The lens-side mount tube portion 42 protrudes in the Z-minus direction by a predetermined length from the inner peripheral side of the lens-side mount reference surface 41a. The central axis of the lens-side mount tube portion 42 substantially coincides with the optical axis of the lens barrel 20 . The lens-side mount tube portion 42 has a lens-side claw portion 43 and a groove portion 44 on its outer peripheral surface.

The lens-side claw portion 43 is provided at the end portion of the lens-side mount tube portion 42 in the minus Z direction. The lens-side claw portion 43 is a portion that faces the camera-side claw portion 33 provided on the camera-side mount 30 of the camera body 10 when the lens barrel 20 is attached to the camera body 10 .

The lens-side claw portion 43 has a predetermined thickness in the Z direction and is formed in a substantially plate shape. The lens-side claw portion 43 protrudes radially outward on the outer peripheral side of the lens-side mount tube portion 42 . The lens-side claw portion 43 is formed to have a predetermined length along the outer peripheral edge of the lens-side mount cylinder portion 42 . Four lens-side claw portions 43 are provided along the outer peripheral edge of the lens-side mount tube portion 42 . The circumferential length of each lens-side claw portion 43 can be changed as appropriate within the range in which it can be attached to and detached from the camera-side claw portion 33. can be changed as appropriate within the detachable range.

A groove portion 44 is formed between the lens side mount reference surface 41a and the lens side claw portion 43 in the Z direction. The groove portion 44 is formed by the gap between the lens-side mount reference surface 41 a and the lens-side claw portion 43 and the outer peripheral surface of the lens-side mount cylinder portion 42 . The groove portion 44 is a portion where the camera-side claw portion 33 of the camera-side mount 30 relatively moves in the circumferential direction when the lens barrel 20 is attached to and detached from the camera body 10 .

Flange 41 has screw holes 45 . For example, four screw holes 45 are provided at approximately equal intervals in the circumferential direction of the lens-side mount reference surface 41a. The base member 40A is screwed to the lens barrel 20 with screws 46 inserted into the screw holes 45. As shown in FIG.

The flange 41 also has mount positioning pin holes 47 . The mount positioning pin hole 47 is a hole into which the mount positioning pin 37 of the camera-side mount 30 protrudes in the plus Z direction and fits therein when the lens barrel 20 is attached to the camera body 10 .

<Mounting example of lens barrel 20>
Next, an example of mounting the lens barrel 20 on the camera body 10 will be described with reference to FIGS. 6 and 7. FIG.

FIG. 6 is a partially enlarged view of the camera-side mount 30 according to the first embodiment. FIG. 6 is a view of the camera-side claw portion 33 viewed from the inner peripheral side of the camera-side mount 30 toward the outer peripheral side. An inner peripheral edge of the camera-side claw portion 33 is formed with a chamfer 33c, one end 33a, a housing portion 301, and the other end 33b in order along the circumferential direction. The one end 33a of the camera-side claw portion 33 is the end on which the one end of the plate spring 202 (the end where the hole 202a is formed) is provided. The other end 33b of the camera-side claw portion 33 is the end where the other end of the leaf spring 202 (the end where the hole 202b is formed) is provided. The chamfer 33c is an inclined portion having a surface inclined in the Z direction.

The thickness of one end 33a of the camera-side claw portion 33 from the camera-side mount reference surface 32 in the Z-minus direction (thickness in the direction along the central axis (for example, the optical axis OA) passing through the center of the second annular portion 30B) ) is D1, and the thickness of the other end 33b of the camera-side claw portion 33 from the camera-side mount reference surface 32 in the Z minus direction is D2. In this case, the camera-side claw portion 33 is formed such that D2>D1. The step between D1 and D2 is assumed to be D3 (=D2-D1). The step D3 is, for example, about 1 to 3% of the thickness D1, preferably about 1.5 to 2.0%. The step D3 is preferably greater than the tolerance of the thickness D1 or the thickness D2, for example. In Example 1, the tolerance of the thickness D1 or the thickness D2 is, for example, about 1%.

FIG. 7 is an explanatory view showing an example of attaching the lens-side mount 40 to the camera-side mount 30 according to the first embodiment. 7 is also a view of the camera-side claw portion 33 and the lens-side claw portion 43 as seen from the inner peripheral side to the outer peripheral side of the camera-side mount 30, similarly to FIG. 7 shows two of the four lens-side claw portions 43, the lens-side claw portion 43 on the left side of the lens-side claw portion 43 is designated as the lens-side claw portion 43L, and the lens-side claw portion on the right side of the lens-side claw portion 43 is shown. Let the portion 43 be a lens-side claw portion 43R.

Similarly, the grooves 44 are grooves 44L and 44R. It is also assumed that the lens barrel 20 rotates from left to right in FIG. 7 when attached to the camera body 10 (the same applies to FIG. 6). The process of mounting the lens barrel 20 on the camera body 10 is shown in FIGS. 7(A) to 7(F). Note that the movement of the lens-side claw portion 43R is the same as that of the lens-side claw portion 43L, so the description thereof is omitted.

FIG. 7A The lens barrel 20 is moved relative to the camera body 10 in the negative Z direction. That is, the lens side mount 40 is moved in the Z-minus direction with respect to the camera side mount 30 . Due to this movement, the lens-side claw portion 43L is inserted into the space between the camera-side claw portions 33 in the circumferential direction of the camera-side mount 30, and the camera-side claw portion 33 faces toward the negative Z direction side (imaging surface side). move on.

FIG. 7B By the movement of FIG. 7A, the camera-side claw portion 33 is inserted into the space between the two lens-side claw portions 43 in the circumferential direction. As a result, the camera-side mount reference surface 32 of the camera-side mount 30 and the lens-side mount reference surface 41a of the lens-side mount 40 come into contact with each other. Then, the distance in the Z direction from the imaging surface of the lens barrel 20 is determined.

7(C) After contact with the reference surface in FIG. 7(B), the lens-side claw portion 43L moves toward the one end 33a of the camera-side claw portion 33 due to the relative rotation of the lens barrel 20 with respect to the camera body 10. do. The tip of the lens-side claw portion 43L in the rotational direction reaches a position facing the one end 33a of the camera-side claw portion 33 . At this time, the distal end portion of the lens-side claw portion 43L in the rotational direction is out of contact with the one end 33a of the camera-side claw portion 33 .

FIG. 7D When the lens barrel 20 is further rotated relative to the camera body 10 from FIG. As a result, mounting torque begins to be generated at the contact position between the lens-side claw portion 43 and the plate spring 202 .

7(E) When the lens barrel 20 is further rotated relative to the camera body 10 from FIG. 7(D), the distal end of the lens-side claw portion 43L in the rotational direction passes over the leaf spring 202 and moves toward the camera-side claw portion. 33 reaches the other end 33b. At this time, the leaf spring 202 is elastically deformed by being pressed by the lens side claw portion 43L, and urges the lens side claw portion 43L in the Z-minus direction. The mounting torque increases due to the change in the contact position between the lens-side claw portion 43 and the plate spring 202 .

FIG. 7F When the lens barrel 20 is further rotated relative to the camera body 10 from FIG. At this time, the plate spring 202 continues to urge the lens-side claw portion 43L in the negative Z direction, as in FIG. 7(E).

In this state, the mount positioning pin 37 of the camera-side mount 30 fits into the mount positioning pin hole 47 of the lens-side mount 40, completing the mounting. As a result, relative rotation of the lens barrel 20 with respect to the camera body 10 is prohibited. As a result, the camera-side mount reference surface 32 of the camera-side mount 30 and the lens-side mount reference surface 41a of the lens-side mount 40 come into surface contact and are positioned in the circumferential direction about the optical axis OA. Also, the camera-side claw portion 33 is positioned between the lens-side claw portion 43 and the lens-side mount reference surface 41a, and the lens-side mount 40 and the camera-side mount 30 are positioned in the Z-minus direction. In this manner, when the lens barrel 20 is attached to the camera body 10, the movement of the lens barrel 20 relative to the camera body 10 in the direction of the optical axis OA and in the direction around the optical axis OA is restricted.

FIG. 8 is a plan view showing how the lens side mount 40 is attached to the camera side mount 30. FIG. FIG. 8 shows the positional relationship between one end 33 a and the other end 33 b of the camera-side claw portion 33 and the screw 36 . In this embodiment, the circumferential end of the camera-side claw portion 33 and the circumferential end of the lens-side claw portion 43 do not match in the circumferential direction, but this can be changed as appropriate. In each camera-side claw portion 33, the other end 33b is positioned at a position farther from the screw 36 than the one end 33a.

Next, the case of releasing the coupling between the camera-side mount 30 and the lens-side mount 40 will be described. The user presses the lock release button 38 provided on the camera body 10 to put the mount positioning pin 37 into the retracted state. Thereby, the fitting between the mount positioning pin 37 and the mount positioning pin hole 47 is released.

Then, the lens side mount 40 becomes rotatable with respect to the camera side mount 30 . After that, the camera-side mount 30 and the lens-side mount 40 are coupled by performing the operation procedure (F) ⇒ (A) reverse to the operation procedure (A) ⇒ (F) shown in FIG. is released. As a result, the lens barrel 20 can be removed from the camera body 10 .

Here, when the lens barrel 20 is attached to the camera body 10, for example, if only the lens barrel 20 receives an impact in the vertical direction while the camera body 10 is held, the impact is applied to the lens barrel 20. is transmitted from the lens side mount 40 to the camera body 10 via the camera side mount 30. - 特許庁If the impact is large, the screw 36 of the camera-side mount 30 comes off, and there is a problem that the lens barrel 20 comes off together with the camera-side mount 30 . In other words, in the imaging system 1 in which the lens barrel 20 is detachable, if an external force is applied to at least one of the lens barrel 20 and the camera body 10 in a direction that intersects the optical axis, the mount portion will come off the body. I had a problem.

However, in this embodiment, a step D3 is provided so that one end 33a of the camera-side claw portion 33 does not come into contact with the lens-side claw portion 43, and the other end 33b is positioned farther from the screw 36 than the one end 33a. . One end 33a of the camera-side claw portion 33 does not contact the lens-side claw portion 43 when no impact is applied. It is possible to contact 43 and receive an impact.

As a result, the impact applied to the lens barrel 20 is transmitted to the lens-side claw portion 43, the other end 33b of the camera-side claw portion 33, the one end 33a of the camera-side claw portion 33, and the screw 36 in this order, thereby dispersing the impact. improves. By improving the dispersibility of impact, the camera side mount 30 is effectively prevented from coming off from the camera body 10.例文帳に追加

Further, a screw 46 is arranged on the outer circumference of the lens-side claw portion 43 at a position facing the one end 33 a of the camera-side claw portion 33 . That is, the distance between the position of the lens side claw portion 43 facing the one end 33a of the camera side claw portion 33 and the screw 46 is the same as the position of the lens side claw portion 43 facing the other end 33b of the camera side claw portion 33 and the screw 46 less than the distance from Therefore, the impact applied to the lens barrel 20 is also transmitted to the lens side claw portion 43, the other end 33b of the camera side claw portion 33, the one end 33a of the camera side claw portion 33, and the screw 46 in this order. To effectively suppress the disengagement of the lens side mount 40 from the lens barrel 20 by improving the dispersibility of impact.

In addition, the circumferential lengths of the chamfer 33c, the one end 33a, and the other end 33b of the camera-side claw portion 33 are shorter in the order of the other end 33b, the one end 33a, and the chamfer 33c. By increasing the length of the other end 33b in the circumferential direction, the contact area between the camera-side claw portion 33 and the lens-side claw portion 43 is increased while the lens barrel 20 is attached to the camera body 10. It can be installed stably.

In particular, if at least one screw 36 is arranged on each of the camera-side claw portion 33 and the lens-side claw portion 43 on the outer peripheral side, the dispersibility can be improved in either claw portion.

In addition, since the one end 33a of the camera-side claw portion 33 and the other end 33b of the camera-side claw portion 33 are arranged along the direction of rotation at the time of mounting, the thickness of the camera-side claw portion 33 entering the groove portion 44 is gradually increased. The size can be increased, and wearability can be improved. In this embodiment, the one end 33a of the camera-side claw portion 33 is chamfered 33c to form an inclined surface, thereby further improving mountability.

Example 2 shows a shape modification. In Example 1, each of the lens-side claw portions 43 has a uniform thickness in the Z direction, but in Example 2, each of the lens-side claw portions 430 has a different thickness in the Z direction. On the other hand, in Example 1, each camera-side claw portion 33 has a different thickness in the Z direction, but in Example 2, each camera-side claw portion 33 has a uniform thickness in the Z direction (D1=D2 ). Note that, in the second embodiment, differences from the first embodiment will be mainly described, so the same reference numerals will be given to the same parts as in the first embodiment, and the description thereof will be omitted.

FIG. 9 is a partially enlarged view of the lens side mount 40 according to the second embodiment. FIG. 9 is a view of the lens-side claw portion 430 viewed from the inner peripheral side of the lens-side mount 40 toward the outer peripheral side. The surface 430c of the lens-side claw portion 430 on the negative Z direction side (the surface not facing the lens-side mount reference surface 41a) is used as a thickness reference surface. The thickness of one end 430a of the lens-side claw portion 430 in the rotational direction is d1, the thickness of the other end 430b is d2 (<d1), and the difference between the thickness d1 and the thickness d2 is d3 (=d1-d2). do. The thickness d2 is the thickness at which the leaf spring 202 contacts the other end 430b when coupled with the camera-side mount 30. As shown in FIG. The step d3 is, for example, about 1 to 3% of the thickness d2, preferably about 1.5 to 2.0%. Step d3 is preferably greater than the tolerance of thickness d1 or thickness d2. In Example 2, the tolerance of the thickness d1 or the thickness d2 is, for example, about 1%.

Also, the length of one end 430a in the rotational direction when the lens-side claw portion 430 is attached is L1, and the length of the other end 430b is L2 (>L1). The length L2 is such that one end of the leaf spring 202 where the hole 202a is formed reaches the boundary between the one end 430a and the other end 430b when coupled with the camera-side mount 30 .

FIG. 10 is an explanatory view showing an example of attaching the lens side mount 40 to the camera side mount 30 according to the second embodiment.

FIG. 10A The lens barrel 20 is moved relative to the camera body 10 in the Z-minus direction. That is, the lens side mount 40 is moved in the Z-minus direction with respect to the camera side mount 30 . By this movement, the lens-side claw portion 430L is inserted into the space between the camera-side claw portions 33 in the circumferential direction of the camera-side mount 30, and the camera-side claw portion 33 faces toward the negative Z direction side (imaging surface side). move on.

FIG. 10B By the movement of FIG. 10A, the camera-side claw portion 33 is inserted into the space between the two lens-side claw portions 430 in the circumferential direction. As a result, the camera-side mount reference surface 32 of the camera-side mount 30 and the lens-side mount reference surface 41a of the lens-side mount 40 come into contact with each other. Then, the distance in the Z direction between the lens barrel 20 and the imaging plane is determined.

10(C) After contact with the reference surface in FIG. 10(B), the lens-side claw portion 430L moves toward the one end 33a of the camera-side claw portion 33 due to the relative rotation of the lens barrel 20 with respect to the camera body 10. do. The other end 430 b , which is the leading end in the rotational direction of the lens-side claw portion 430 L, reaches a position facing the one end 33 a of the camera-side claw portion 33 . At this time, the other end 430b of the lens-side claw portion 430L is out of contact with the one end 33a of the camera-side claw portion 33. As shown in FIG.

FIG. 10(D) When the lens barrel 20 is further rotated relative to the camera body 10 from FIG. As a result, mounting torque begins to be generated at the contact position between the lens-side claw portion 43 and the leaf spring 202 .

10(E) When the lens barrel 20 is further rotated relative to the camera body 10 from FIG. It reaches the other end 33b. At this time, the leaf spring 202 is elastically deformed by being pressed by the lens side claw portion 430L, and urges the lens side claw portion 430L in the Z-minus direction. The mounting torque increases due to the change in the contact position between the lens-side claw portion 43 and the plate spring 202 .

FIG. 10F When the lens barrel 20 is further rotated relative to the camera body 10 from FIG. At this time, similarly to FIG. 10E, the plate spring 202 continues to bias the lens-side claw portion 430L in the Z direction.

In this state, the mount positioning pin 37 of the camera-side mount 30 fits into the mount positioning pin hole 47 of the lens-side mount 40, completing the mounting. As a result, relative rotation of the lens barrel 20 with respect to the camera body 10 is prohibited. As a result, the camera-side mount reference surface 32 of the camera-side mount 30 and the lens-side mount reference surface 41a of the lens-side mount 40 come into surface contact and are positioned in the circumferential direction about the optical axis OA. Also, the camera-side claw portion 33 is positioned between the lens-side claw portion 430 and the lens-side mount reference surface 41a, and the lens-side mount 40 and the camera-side mount 30 are positioned in the Z-minus direction.

Also, the lens barrel 20 is positioned in the direction around the optical axis OA by the mount positioning pin 37 fitted in the mount positioning pin hole 47 . In this manner, when the lens barrel 20 is attached to the camera body 10, the movement of the lens barrel 20 relative to the camera body 10 in the direction of the optical axis OA and in the direction around the optical axis OA is restricted.

On the other hand, in order to release the connection between the camera-side mount 30 and the lens-side mount 40, the user pushes the lock release button 38 provided on the camera body 10 to put the mount positioning pin 37 into the retracted state. Thereby, the fitting between the mount positioning pin 37 and the mount positioning pin hole 47 is released.

Then, the lens side mount 40 becomes rotatable with respect to the camera side mount 30 . After this, the camera-side mount 30 and the lens-side mount 40 are coupled by performing the operation procedure (F) ⇒ (A), which is the reverse of the operation procedure (A) ⇒ (F) shown in FIG. is released. As a result, the lens barrel 20 can be removed from the camera body 10 .

Thus, in Example 2 as well, the step d3 is provided and the position of the one end 430a is arranged further away from the screw 46 than the other end 430b. The other end 430b of the lens-side claw portion 430 does not contact the camera-side claw portion 33 when no impact is applied. It is possible to contact the portion 33 and receive an impact.

As a result, the impact applied to the lens barrel 20 is transmitted to one end 430a of the lens side claw portion 430, the other end 430b of the lens side claw portion 430, the camera side claw portion 33, and the screw 46 in this order, thereby dispersing the impact. improves. By improving the dispersibility of impact, the camera side mount 30 is effectively prevented from coming off from the camera body 10.例文帳に追加

Also, the length in the circumferential direction of one end 430a of the lens-side claw portion 430 is shorter than the length in the circumferential direction of the other end 430b of the lens-side claw portion 430 . By increasing the length of the other end 430b in the circumferential direction, the contact area between the camera-side claw portion 33 and the lens-side claw portion 430 is increased while the lens barrel 20 is attached to the camera body 10. It can be installed stably.

In particular, if at least one screw 46 is arranged on the outer peripheral side of each lens-side claw portion 430, the dispersibility can be improved in any claw portion.

As described above, according to the present embodiment, the camera-side claw portion 33 and the lens-side claw portion 430 are provided with the step D3 and the step d3, and are further from the other end 33b and the one end 43a than the one end 33a and the other end 43b. Screws 36 and 46 for fastening the camera-side mount 30 and the lens-side mount 40 are arranged at the positions.

Therefore, not only the leaf spring 202 but also the camera-side mount 30 and the lens-side mount 40 themselves can be treated as spring members. As a result, the dispersibility of the impact applied to the lens barrel 20 is improved, and the impact resistance is improved. In addition, since the camera-side mount 30 and the lens-side mount 40 have simple configurations, the angle accuracy between the optical axis of the camera body 10 and the optical axis of the lens 22 can be maintained with high accuracy.

Although the leaf spring 202 is arranged between the one end 33a and the other end 33b in the first and second embodiments, the boundary between the one end 33a and the other end 33b can be changed as appropriate. Further, in addition to providing one step D3 between the one end 33a and the other end 33b in the first embodiment, a plurality of steps may be provided, or an inclination may be provided.

Further, although the step D3 is provided in the camera-side claw portion 33 in the first embodiment and the step d3 is provided in the lens-side claw portion 430 in the second embodiment, both the camera-side claw portion 33 and the lens-side claw portion 430 are provided with a step D3. A slope may be provided.

Further, in the first and second embodiments, the screws 36, 46 as fixing members are arranged on the outer peripheral side of the camera-side claw portion 33 or the lens-side claw portions 43, 430, but can be changed as appropriate. In the circumferential direction around the optical axis OA, the distance between one end of the claw portion and the fixed member should be smaller than the distance between the other end of the claw portion and the fixed member. Also, although the number of screws 36 and 46 is equal to the number of claws, the number of screws may be greater than the number of claws to improve impact resistance.

In addition, the present invention is not limited to the above contents, and may be arbitrarily combined. Other aspects conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

1 Imaging System 10 Camera Body 20 Lens Barrel 30 Camera Side Mount 32 Camera Side Mount Reference Surface 33 Camera Side Claw Portion 33a One End 33b Other End 36 Screw 40 Lens Side Mount 41a Lens Side Mount reference surface 42 lens side mount tube portion 43, 430 lens side claw portion 43a, 430a one end 43b, 430b other end 46 screw 202 plate spring D3 step d3 step

Claims (13)

A camera body mount to which a lens barrel can be attached, comprising a first surface, a cylindrical portion provided in a direction intersecting the first surface, and a lens-side projecting portion radially projecting from the cylindrical portion. hand,
an annular portion with which the first surface contacts when the lens barrel is attached to the camera body;
a body-side protruding portion that protrudes inward from the inner circumference of the annular portion and contacts the lens-side protruding portion when the lens barrel is attached to the camera body;
a fixing member that fixes the annular portion to the camera body,
the body-side projecting portion has a first portion that contacts the lens-side projecting portion when the lens barrel is attached to the camera body, and a second portion that does not contact the lens-side projecting portion;
the distance between the fixing member and the first portion is greater than the distance between the fixing member and the second portion;
A plurality of the body-side projecting portions and the fixing member are arranged along the circumferential direction of the annular portion,
In all of the body-side projecting portions, the second portion and the first portion are arranged in order along the circumferential direction,
A mount in which the distance between the fixing member and the first portion is greater than the distance between the fixing member and the second portion in all of the body-side protrusions. A camera body mount with a detachable lens barrel,
an annular portion having an annular shape;
a fixing member that fixes the annular portion to the camera body;
a body-side protruding portion protruding inward from the inner periphery of the annular portion;
The body-side projecting portion has a first portion along the circumferential direction of the inner circumference and a second portion having a smaller thickness in a direction along the center axis of the annular portion than the first portion. death,
the distance between the fixing member and the first portion is greater than the distance between the fixing member and the second portion;
A plurality of the body-side projecting portions and the fixing member are arranged along the circumferential direction of the annular portion,
In all of the body-side projecting portions, the second portion and the first portion are arranged in order along the circumferential direction,
A mount in which the distance between the fixing member and the first portion is greater than the distance between the fixing member and the second portion in all of the body-side protrusions. 3. A mount according to claim 1 or 2,
A mount in which the fixing member is arranged on the outer peripheral side of all the body-side protrusions. 4. The mount of claim 3, comprising:
A mount in which the fixing member is arranged on one end side of a center position of each of the body-side protrusions in the circumferential direction in all of the body-side protrusions. A mount according to any one of claims 1 to 4,
when the lens barrel is attached to the camera body, the first portion contacts the lens barrel and the second portion does not contact the lens barrel;
When an external force is applied to at least one of the lens barrel and the camera body from a direction intersecting the central axis of the annular portion while the lens barrel is attached to the camera body, the second portion is contactable with the lens barrel,
mount. 6. A mount according to any one of claims 1 to 5,
The thickness of the first portion in the direction along the central axis passing through the center of the annular portion is substantially constant,
The mount wherein the thickness of the second portion in a direction along the central axis is less than the thickness of the first portion. 7. A mount according to any one of claims 1 to 6,
A plurality of the fixing members are arranged along the circumferential direction of the annular portion,
In the mount, the distance between the center position and the second portion in the circumferential direction of the adjacent fixing members is greater than the distance between the center position and the first portion. A mount according to any one of claims 1 to 7,
The body-side projecting portion comes into contact with the lens barrel by rotating the lens barrel in a predetermined direction with respect to the camera body,
A mount arranged in the order of the second portion and the first portion along the predetermined direction. 9. The mount of claim 8, comprising
The body-side protruding portion has an inclined portion that is inclined along a direction that intersects a central axis that passes through the center of the annular portion on the rear end side of the second portion in the predetermined direction. A mount according to any one of claims 1 to 9,
an elastic body provided between the first portion and the second portion;
When the lens barrel is attached to the camera body, the elastic body contacts the lens barrel and provides elastic force to the mount. 11. A mount according to any one of claims 1 to 10,
A plurality of the body-side projecting portions are provided along the circumferential direction of the annular portion,
The fixing member is a mount arranged on the outer peripheral side of the second portion at each of the body-side protrusions. An imaging device comprising a mount according to any one of claims 1-11. a lens barrel and
an imaging device according to claim 12;
an imaging system.

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