Bayonet device and camera device

Abstract

The utility model provides a bayonet device and a camera device, which can inhibit the force of separating an accessory device from the camera device to enhance the clamping of the accessory device to the camera device even if the accessory device which is large in mass, long in total length and the like is assembled on the camera device. The locking member (22) is rotatably supported, presses the first ring member (21) engaged with the lens barrel (12) in the optical axis direction (OA) of the lens barrel (12) and locks the lens barrel (12) when the locking member (22) rotates in the first direction (R1), and releases the pressing when the locking member (22) rotates in the second direction (R2).

Description

TECHNICAL FIELD

[0001] The utility model relates to a bayonet device and camera device. BACKGROUND

[0002] In patent document 1, the following is described: in the case of combining a mount adapter incorporating an interchangeable lens with a camera main body, by rotating a grip portion provided to a lens mount of the camera main body, a mount claw portion of the lens mount engages with a first mount claw portion provided to one end portion of a movable cylinder of the mount adapter installed on the lens mount.

[0003] In patent document 2, the following is described: in the case of installing an interchangeable lens on a lens mount, by rotating a lever, a lens mount side bayonet claw portion comes into abutment with a lens bayonet claw portion, and the interchangeable lens is installed on the lens mount.

[0004] In patent document 3, the following is described: in the case of installing an optical device such as a lens device on a camera 4, the lens mount is inserted into a camera mount, and a pressing mechanism on the optical device side is moved in the direction of the optical axis, thereby pressing the optical device on the subject side surface of the camera.

[0005] Patent document 1: Japanese Patent Application Publication No. 2019-78902

[0006] Patent document 2: Japanese Patent Application Publication No. 2015-60076

[0007] Patent document 3: Japanese Patent Application Publication No. 2020-118774 SUMMARY

[0008] The utility model aims at providing a bayonet device and camera device, which can suppress the force with which an accessory device comes off the camera device and enhance the engagement of the accessory device to the camera device even in the case of installing a large accessory device having a large mass and a long total length on the camera device.

[0009] The bayonet device of the utility model has: a fixed member; a first ring member that engages with an accessory device in the case of installing the accessory device; and a locking member that is supported so as to be rotatable, and if rotated in a first direction, presses the first ring member that engages with the accessory device in the direction of the optical axis of the accessory device to lock the accessory device, and if rotated in a second direction, releases the pressing.

[0010] Preferably, the first ring member has a plurality of first inclined surface portions in which the thickness in the direction of the optical axis changes, the locking member has a plurality of second inclined surface portions in which the thickness in the direction of the optical axis changes, and if the locking member is rotated in the first direction, the second inclined surface portions overlap the first inclined surface portions in the radial direction of the locking member, and as a result, the locking member is pressed in the direction of the optical axis.

[0011] The first inclined surface portion and the second inclined surface portion are preferably each three. In the case of rotating the locking member in the first direction, the starting point of the second inclined surface portion is preferably pressed against the first inclined surface portion whose thickness becomes greater toward the first direction, and is rotated.

[0012] The first ring member preferably has a plurality of engagement portions that engage with the accessory device, and the engagement portions press the accessory device by pressing of the locking member against the first ring member.

[0013] The force applying portion that applies a force to the accessory device engaged with the first ring member is preferably provided between the plurality of first inclined surface portions whose thicknesses in the optical axis direction change.

[0014] The second ring member that has a coupling portion for coupling in a state in which the first ring member is movable in the optical axis direction and the locking member is rotatable is preferably fastened to the fixing member by the fastening member.

[0015] The first ring member has a plurality of first inclined surface portions whose thicknesses in the optical axis direction change from a starting point to an end point, and the coupling portion forms an angle of 15° or less with the end point of the first inclined surface portion.

[0016] The second ring member that has a coupling portion for coupling in a state in which the first ring member is movable in the optical axis direction and the locking member is rotatable is preferably provided, and the locking member has a through-hole formed in a radial direction of the locking member for the coupling portion to pass through. The through-hole is preferably formed so that a radial stroke of the locking member is 40° or less.

[0017] The pin member that is movable in the optical axis direction and engages with the accessory device is preferably provided. The second ring member that has a coupling portion for coupling in a state in which the first ring member is movable in the optical axis direction and the locking member is rotatable is preferably provided.

[0018] The locking member has a through-hole formed in a radial direction of the locking member for the pin member and the coupling portion to pass through. The lens mount device according to the present application is provided.

[0019] Effect of the Invention

[0020] According to the present application, even in the case in which a large accessory device having a large mass and a long total length is attached to the camera device, the force with which the accessory device is intended to be separated from the camera device can be suppressed to enhance the engagement of the accessory device with the camera device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view showing a digital camera and a lens barrel.

[0022] Figure 2 is a perspective view showing the bayonet mount.

[0023] Figure 3 is a partial cross-sectional view of the bayonet mount.

[0024] Figure 4 is an exploded perspective view of the first ring member, the locking member, and the second ring member.

[0025] Figure 5 is a perspective view of the first ring member.

[0026] Figure 6 is an explanatory view showing the first inclined surface portion.

[0027] Figure 7 is a perspective view of the locking member.

[0028] Figure 8 is an explanatory view showing the second inclined surface portion.

[0029] Figure 9 is an explanatory view showing the movement of the optical axis direction of the first ring member when the locking member is rotated in the first direction.

[0030] Figure 10 is an explanatory view showing the movement of the optical axis direction of the first ring member when the locking member is rotated in the second direction.

[0031] Figure 11 is a perspective view of the force applying ring.

[0032] Figure 12 is a perspective view of the first ring member and the force applying ring.

[0033] Figure 13 is an explanatory view showing the angle θ1.

[0034] Figure 14 is an explanatory view showing the stroke θ2. DETAILED DESCRIPTION

[0035] As shown in Figure 1 , a digital still camera 10 is an image pickup apparatus for taking an image of a subject, and includes a camera body 11 and a detachable lens barrel 12. A bayonet mount 13, a release switch 14, a power switch (not shown), and the like are provided on the front surface of the camera body 11. The lens barrel 12 is detachably mounted on the bayonet mount 13.

[0036] As shown in Figure 2 and Figure 3As shown, the bayonet device 13 includes a fixing member 20 fixed to the camera body 11, a first ring member 21, and a locking member 22. The first ring member 21 engages with the lens barrel 12 when the lens barrel 12 is installed. In the first ring member 21, three locking pins 21a are provided at 120° intervals as the engaging part for engaging with the lens barrel 12.

[0037] The locking member 22 is rotatably supported relative to the fixing member 20 and functions as a locking member that locks the lens barrel 12 into the first ring member 21. If the locking member 22 rotates in a first clockwise direction R1, the first ring member 21, which engages with the lens barrel 12, is pressed against the optical axis OA of the lens barrel, thus locking the lens barrel 12. On the other hand, if the locking member 22 rotates in a second counterclockwise direction R2, the pressure on the first ring member 21 is released. A rotating rod 22a is provided on the locking member 22 for rotating the locking member 22 in either the first direction R1 or the second direction R2.

[0038] like Figure 4 As shown, the bayonet device 13 includes a second ring member 24, which has a connecting portion 24a for engaging in a state that allows the first ring member 21 to move in the optical axis direction OA and allows the locking member 22 to rotate. The connecting portions 24a are protrusions, etc., and there are six of them. The connecting portions 24a are sequentially inserted into the insertion holes 22b of the locking member 22 and the insertion holes 21b of the first ring member 21. In this state, the screws 24b (see reference) serve as fastening components. Figure 2 It is screwed into the joint 24a, and the second ring component 24 is fastened to the fixing component 20.

[0039] like Figure 5 As shown, the first ring component 21 has three first inclined surfaces 26 arranged at 120° intervals. Figure 6 As shown, in the first inclined portion 26, the thickness Th1 in the optical axis direction OA changes from the starting point 26a to the ending point 26b. The closer to the first direction R1, the greater the thickness Th1 in the first inclined portion 26. Figure 7 As shown, the locking component 22 has three second inclined surfaces 28 spaced at 120° intervals. Figure 8 As shown, in the second inclined section 28, the thickness Th2 in the optical axis direction OA changes from the starting point 28a to the ending point 28b. The closer to the first direction R1, the smaller the thickness Th2 in the second inclined section 28 becomes.

[0040] In the case where the locking member 22 is rotated in the first direction Rl, the first inclined surface portion 26 overlaps the second inclined surface portion 28 in the radial direction of the locking member 22. In this case, the first inclined surface portion 26 is rotated while being pressed against the starting point portion 28a of the second inclined surface portion 28 in the locking member 22, which becomes larger in thickness Thl the closer it is to the first direction Rl. As a result, as shown in FIG. 8, the locking member 22 is moved toward the first ring member 21 side in the optical axis direction OA and presses the first ring member 21. In the first ring member 21, the lens barrel 12 is pressed by the bayonet claw 21a based on the pressing by the locking member 22. On the other hand, in the case where the locking member 22 is rotated in the second direction R2, the first inclined surface portion 26 does not overlap the second inclined surface portion 28 in the radial direction of the locking member 22. As a result, as shown in FIG. 9, the locking member 22 is moved toward the second ring member 24 side in the optical axis direction OA, thereby releasing the pressing of the first ring member 21 by the locking member 22. In correspondence therewith, the pressing of the lens barrel 12 by the bayonet claw 21a is also released. Figure 9 Figure 10

[0041] As described above, by pressing the first ring member 21 using the locking member 22, the gap between the optical axis direction OA and the lens barrel 12 side can be made zero, so even if the lens barrel 12 is large and a force for separating the lens barrel 12 from the digital camera 10 acts, the locked state with the lens barrel 12 can be maintained. Also, as described later, the lens barrel 12 is pulled in and held by the urging portion 30a, but the torque force for separating the lens barrel 12 from the digital camera 10 due to the large size of the lens barrel 12 is larger than the pulling-in force of the lens barrel 12 based on the urging portion 30a, so even in this case, the lens barrel 12 can be prevented from being lifted from the digital camera 10 by the pressing of the first ring member 21 based on the locking member 22.

[0042] Also, the lens barrel 12 can be temporarily held by the bayonet claw 21a of the bayonet device 13, so when the operation in the first direction Rl is performed by the locking member 22, the lens barrel 12 does not need to be held by hand. On the other hand, when the operation in the second direction R2 is performed by the locking member, the lens barrel 12 does not need to be held by hand, so the lens barrel 12 does not fall off.

[0043] As shown in FIG. 6, the bayonet device 13 is provided with an urging ring 30 having an urging portion 30a that urges the lens barrel 12 engaged with the first ring member 21. As shown in FIG. 7, the urging ring 30 is provided with a first inclined surface portion 26 and a second inclined surface portion 28. The first inclined surface portion 26 is formed on the side of the urging portion 30a, and the second inclined surface portion 28 is formed on the side opposite to the urging portion 30a. The first inclined surface portion 26 and the second inclined surface portion 28 are inclined in the radial direction of the urging ring 30. Figure 11 Figure 12 ​​​As shown, the force applying portions 30a are provided three in number at intervals of 120° between the first inclined surface portions 26 of the first ring member 21. The force applying portions 30a are leaf springs, and if the lens barrel 12 is engaged by the bayonet claws 21a, the bayonet claw engaging portions (not shown) of the lens barrel 12 are forced by the force applying portions 30a. In addition, through holes 30b for the engaging portions 24a of the second ring member 24 to pass through and notches 30c for the pin member 32 (see FIG. 6) to pass through are formed in the force applying ring 30. Figure 14 ) are inserted into the notches 30c.

[0044] As shown in FIG. 2, the angle θ1 formed by the engaging portions 24a of the second ring member 24 and the first inclined surface portions 26 of the first ring member 21 is preferably within 15°. By setting the angle θ1 within 15°, when pressed by the stopper member 22, the deformation of the first ring member 21 and the second ring member 24 can be reduced. Figure 13

[0045] As shown in FIG. 2, the through holes 22b of the stopper member 22 are set so that the radial stroke θ2 of the stopper member 22 is within 40°. By setting the stroke θ2 within 40°, at least six points of the engaging portions 24a can be ensured, and thus the strength of the engagement of the second ring member 24 can be ensured. Figure 14

[0046] The pin member 32, which is movable in the optical axis direction OA and engages the lens barrel 12, is also inserted into the through holes 22b. If the pin member 32 comes into contact with the second ring member 24 when the lens barrel 12 is initially mounted, the camera body 11 side in the optical axis direction OA is pressed. Then, if the lens barrel 12 is engaged by the bayonet claws 21a, the pin member 32 moves to the lens barrel 12 side in the optical axis direction OA, and thus the pin member 32 engages the lens barrel 12. The pin member 32 is forced to the lens barrel 12 side in the optical axis direction OA, and thus as long as the pin release button 33 provided in the bayonet mount 13 is not operated, the engagement of the lens barrel 12 by the pin member 32 can be maintained.

[0047] Then, by operating the pin release button 33, the pin member 32 moves to the camera body 11 side in the optical axis direction OA. Thus, the engagement of the lens barrel 12 by the pin member 32 is released, and thus the lens barrel 12 can be detached.

[0048] ​​Next, the locking method (locking method) and the unlocking method (unlocking method) of the lens barrel 12 using the locking member 22 will be described. In the case of locking the lens barrel 12 to the mount 13, the lens barrel 12 is attached and engaged to the locking pin claw 21a of the first ring member 21. In this state, by rotating the locking member 22 in the first direction Rl, the lens barrel 12 engaged to the first ring member 21 is pressed in the optical axis direction OA of the lens barrel 12, thereby locking the lens barrel 12. On the other hand, in the case of unlocking the lens barrel 12, by rotating the locking member 22 in the second direction R2, the pressing of the lens barrel 12 by the locking member 22 is released.

[0049] In addition, in the above embodiment, the case of attaching the lens barrel 12 to the mount 13 is described, but other accessory devices can be attached to the mount 13. For example, as the accessory device, an adapter ring can be attached to the mount 13.

[0050] Symbol Explanation

[0051] 10 - digital camera, 11 - camera body, 12 - lens barrel, 13 - mount, 14 - release switch, 20 - fixing member, 21 - first ring member, 21a - locking pin claw, 21b - insertion hole, 22 - locking member, 22a - rotation lever, 22b - insertion hole, 24 - second ring member, 24a - coupling portion, 24b - screw, 26 - first inclined surface portion, 26a - start portion, 26b - end portion, 28 - second inclined surface portion, 28a - start portion, 28b - end portion, 30 - urging ring, 30a - urging portion, 30b - insertion hole, 30c - notch, 32 - pin member, 33 - pin release button, OA - optical axis, Rl - first direction, R2 - second direction.

Claims

1. A bayonet device, characterized in that It has: a fixed member; a first ring member that engages with an attachment device when the attachment device is mounted; and a locking member that is supported so as to be rotatable, and that, if rotated in a first direction, presses the first ring member that is engaged with the attachment device in the direction of an optical axis of the attachment device to lock the attachment device, and that, if rotated in a second direction, releases the pressing.

2. The bayonet device according to claim 1, wherein the first ring member has a plurality of first inclined surface portions in which a thickness in the direction of the optical axis changes, the locking member has a plurality of second inclined surface portions in which a thickness in the direction of the optical axis changes, if the locking member is rotated in the first direction, the second inclined surface portions overlap the first inclined surface portions in the radial direction of the locking member, and as a result, the locking member is pressed in the direction of the optical axis.

3. The bayonet device according to claim 2, wherein the first inclined surface portions and the second inclined surface portions are each three.

4. The bayonet device according to claim 2, wherein in a case where the locking member is rotated in the first direction, a start portion of the second inclined surface portions rotates while pressing the first inclined surface portions in which the thickness becomes larger toward the first direction.

5. The bayonet device according to claim 1, wherein the first ring member has a plurality of engagement portions that engage with the attachment device, the engagement portions press the attachment device by the pressing of the locking member on the first ring member.

6. The bayonet device of claim 1, wherein, It has a force applying portion that applies a force to the attachment device engaged with the first ring member, the force applying portion is provided between a plurality of first inclined surface portions provided in the first ring member and in which a thickness in the direction of the optical axis changes.

7. The bayonet device according to claim 1, wherein the bayonet device has a second ring member that has a coupling portion for coupling in a state in which the first ring member is movable in the direction of the optical axis and the locking member is rotatable, the second ring member is fastened to the fixed member by a fastening member, the first ring member has a plurality of first inclined surface portions in which a thickness in the direction of the optical axis changes from a start portion to an end portion, an angle formed by the coupling portion and the end portion of the first inclined surface portion is within 15°.

8. The bayonet device according to any one of claims 1 to 7, wherein the bayonet device has a second ring member that has a coupling portion for coupling in a state in which the first ring member is movable in the direction of the optical axis and the locking member is rotatable, in the locking member, a through hole is formed in the radial direction of the locking member for the coupling portion to pass through.

9. The bayonet device according to claim 8, wherein the through hole is formed so that a radial stroke of the locking member is within 40°.

10. The bayonet device according to any one of claims 1 to 7, characterized in that It has a pin member that is movable in the direction of the optical axis and engaged with the attachment device.

11. The bayonet device according to claim 10, wherein The bayonet device is provided with a second ring member having a coupling portion for coupling in a state in which the first ring member is movable in the direction of the optical axis and the locking member is rotatable, In the locking member, an insertion hole for insertion of the pin member and the coupling portion is formed in the radial direction of the locking member.

12. An image pickup device, characterized by comprising: The bayonet device according to any one of claims 1 to 11.

Images