Bayonet device and camera device

Abstract

The invention provides a bayonet device and an imaging device, which can inhibit the force of separating an accessory device from the imaging device to enhance the clamping of the accessory device to the imaging device even when the accessory device with a large size such as a large weight and a long total length is assembled to the imaging 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 invention relates to a bayonet device and a camera device. Background Art

[0002] Patent document 1 describes the following: When a mount adapter to which an interchangeable lens is attached is coupled to a camera body, by rotating a grip portion of a lens mount provided on the camera body, a mount claw portion of the lens mount engages with a first mount claw portion provided at one end portion of a movable barrel of the mount adapter mounted on the lens mount.

[0003] Patent Document 2 describes that when an interchangeable lens is mounted on a lens mount, a lever is rotated so that a bayonet claw on the lens mount side comes into contact with a lens bayonet claw, thereby mounting the interchangeable lens on the lens mount.

[0004] Patent document 3 states that when an optical device such as a lens device is mounted on a camera 4, the lens mount is inserted into the camera mount, and the pressing mechanism on the optical device side is moved in the direction of the optical axis, thereby pressing the optical device against the subject side of the camera.

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

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2015-60076

[0007] Patent Document 3: Japanese Patent Application Laid-Open No. 2020-118774 Summary of the Invention

[0008] The object of the present invention is to provide a bayonet device and a camera device, which can suppress the force of the accessory device trying to detach from the camera device and enhance the engagement of the accessory device with the camera device even when a large-sized accessory device with a large mass and a long total length is assembled on the camera device.

[0009] The bayonet device of the present invention comprises: a fixing component; a first ring component, which is engaged with the accessory device when the accessory device is installed; and a locking component, which is supported to be rotatable, and when rotated in the first direction, the first ring component engaged with the accessory device is pressed in the optical axis direction of the accessory device to lock the accessory device, and when rotated in the second direction, the pressure is released.

[0010] Preferably, the first ring component has a first inclined surface portion whose thickness changes in the direction of the optical axis, and the locking component has a second inclined surface portion whose thickness changes in the direction of the optical axis. If the locking component is rotated in the first direction, the second inclined surface portion overlaps with the first inclined surface portion along the radial direction of the locking component, thereby pressing the locking component in the direction of the optical axis.

[0011] Preferably, there are three first inclined surface portions and three second inclined surface portions. Preferably, when the locking member is rotated in the first direction, the starting point of the second inclined surface portion rotates while pressing the first inclined surface portion whose thickness increases toward the first direction.

[0012] Preferably, the first ring member has a plurality of engaging portions that engage with the accessory device, and the engaging portions press the accessory device when the first ring member is pressed by the locking member.

[0013] Preferably, a biasing portion is provided for biasing the accessory device engaged with the first ring member, and the biasing portion is provided between a plurality of first inclined surface portions provided on the first ring member and having a varying thickness in the optical axis direction.

[0014] Preferably, the second ring member has a coupling portion for coupling with the first ring member in a state where the first ring member can be moved in the optical axis direction and the locking member can be rotated, and the second ring member is fastened to the fixing member by a fastening member.

[0015] The first ring member has a plurality of first inclined portions whose thickness in the optical axis direction changes from a starting portion to an end portion, and an angle formed between the connecting portion and the end portion of the first inclined portion is within 15°.

[0016] The second ring member preferably includes a coupling portion for coupling with the first ring member so as to enable movement of the first ring member in the optical axis direction and rotation of the locking member. The locking member preferably includes an insertion hole formed in a radial direction of the locking member for insertion of the coupling portion. The insertion hole is preferably formed so that the radial travel of the locking member is within 40 degrees.

[0017] It is preferable to include a pin member that can move in the optical axis direction and engage with the accessory device. It is preferable to include a second ring member that has a coupling portion for coupling in a state in which the first ring member can move in the optical axis direction and the locking member can rotate.

[0018] The locking member has an insertion hole formed along a radial direction of the locking member, through which the pin member and the coupling portion are inserted. An imaging device includes the bayonet device of the present invention.

[0019] Effects of the Invention

[0020] According to the present invention, even when a large accessory device having a large mass and a long total length is mounted on the imaging device, the force of the accessory device attempting to be released from the imaging device can be suppressed and the engagement of the accessory device with the imaging device can be strengthened. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

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

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

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

[0031] Figure 11 It is a three-dimensional diagram of the force ring.

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

[0033] Figure 13 1 is an explanatory diagram showing the angle θ1.

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

[0035] like Figure 1 As shown, the digital camera 10 is an imaging device for photographing a subject and includes a camera body 11 and an interchangeable lens barrel 12. A 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 mount 13.

[0036] like 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 mounted. The first ring member 21 has three bayonet claws 21a provided at intervals of 120° as engaging portions 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 for locking the lens barrel 12 engaged with the first ring member 21. When the locking member 22 is rotated in a first clockwise direction R1, the first ring member 21 engaged with the lens barrel 12 is pressed in the optical axis direction OA of the lens barrel, thereby locking the lens barrel 12. On the other hand, when the locking member 22 is rotated in a second counterclockwise direction R2, the pressure on the first ring member 21 is released. The locking member 22 is provided with a rotating lever 22a for rotating the locking member 22 in the first direction R1 or the second direction R2.

[0038] like Figure 4 As shown, the bayonet device 13 has a second ring member 24, and the second ring member 24 has a coupling portion 24a in order to couple the first ring member 21 to a state where the first ring member 21 can be moved in the optical axis direction OA and the locking member 22 can be rotated. The coupling portions 24a are convex portions, etc., and there are 6 of them. The coupling portions 24a are inserted into the insertion hole 22b of the locking member 22 and the insertion hole 21b of the first ring member 21 in sequence. In this state, by screwing the screw 24b (refer to Figure 2 ) is screwed into the coupling portion 24 a, and the second ring member 24 is fastened to the fixing member 20 .

[0039] like Figure 5 As shown, the first ring member 21 is provided with three first inclined portions 26 at intervals of 120°. Figure 6 As shown in FIG. 2 , the thickness Th1 of the first inclined surface portion 26 in the optical axis direction OA changes from the starting point 26a to the end point 26b. The closer to the first direction R1, the greater the thickness Th1 of the first inclined surface portion 26 becomes. Figure 7 As shown in FIG. 2 , the locking member 22 is provided with three second inclined portions 28 at intervals of 120°. Figure 8 As shown, the thickness Th2 in the optical axis direction OA changes from the starting point 28a to the end point 28b of the second inclined surface portion 28. The thickness Th2 in the second inclined surface portion 28 decreases as it approaches the first direction R1.

[0040] When the locking member 22 is rotated in the first direction R1, the first inclined surface portion 26 and the second inclined surface portion 28 overlap in the radial direction of the locking member 22. In this case, the locking member 22 is rotated while pressing the first inclined surface portion 26, whose thickness Th1 increases as the starting point 28a of the second inclined surface portion 28 approaches the first direction R1. Figure 9 As shown, the locking member 22 moves 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, as the locking member 22 is pressed, the latch claw 21a presses the lens barrel 12. On the other hand, when the locking member 22 is rotated in the second direction R2, the first inclined surface 26 and the second inclined surface 28 do not overlap in the radial direction of the locking member 22. As a result, Figure 10 As shown, the locking member 22 moves toward the second ring member 24 in the optical axis direction OA, thereby releasing the pressure on the first ring member 21 by the locking member 22. Correspondingly, the pressure on the lens barrel 12 by the bayonet claws 21a is also released.

[0041] As described above, by pressing the first ring member 21 with the locking member 22, the gap between the lens barrel 12 and the lens barrel 12 in the optical axis direction OA can be reduced to zero. Therefore, even if the lens barrel 12 is enlarged and a force is applied to separate the lens barrel 12 from the digital camera 10, the locked state with the lens barrel 12 can be maintained. Furthermore, as will be described later, the lens barrel 12 is pulled in and held by the force-applying portion 30a. However, if the moment force to separate the lens barrel 12 from the digital camera 10 due to the enlargement of the lens barrel 12 is greater than the force to pull the lens barrel 12 in due to the force-applying portion 30a, even in this case, the pressing of the first ring member 21 by the locking member 22 can prevent the lens barrel 12 from being lifted from the digital camera 10.

[0042] Furthermore, the lens barrel 12 is temporarily held by being engaged with the bayonet claw 21a of the bayonet device 13. Therefore, when the lens barrel 12 is operated in the first direction R1 by the locking member 22, it is not necessary to manually hold the lens barrel 12. On the other hand, when the lens barrel 12 is operated in the second direction R2 by the locking member, it is also not necessary to manually hold the lens barrel 12, so the lens barrel 12 does not fall off.

[0043] like Figure 11 As shown in FIG. 1 , the bayonet device 13 includes a biasing ring 30 having a biasing portion 30a for biasing the lens barrel 12 engaged with the first ring member 21. Figure 12As shown, three force-applying portions 30a are provided at intervals of 120° between the first inclined surface portion 26 of the first ring member 21. The force-applying portion 30a is a leaf spring. When the lens barrel 12 is engaged by the bayonet claw 21a, the bayonet claw engaging portion (not shown) of the lens barrel 12 is urged by the force-applying portion 30a. In addition, the force-applying ring 30 is provided with an insertion hole 30b for inserting the coupling portion 24a of the second ring member 24 and a pin member 32 (see FIG. Figure 14 ) is inserted through the gap 30c.

[0044] like Figure 13 As shown, the angle θ1 formed between the coupling portion 24a of the second ring member 24 and the first inclined portion 26 of the first ring member 21 is preferably within 15°. By setting the angle θ1 within 15°, deformation of the first ring member 21 and the second ring member 24 can be reduced when pressed by the locking member 22.

[0045] like Figure 14 As shown, the insertion hole 22b of the locking member 22 is set to a stroke θ2 within 40° in a manner such that the radial stroke θ2 of the locking member 22 is within 40°, thereby ensuring at least 6 points of the coupling portion 24a, thereby ensuring the coupling strength based on the second ring member 24.

[0046] A pin member 32 is inserted through the insertion hole 22b, which is movable in the optical axis direction OA and engages with the lens barrel 12. When the lens barrel 12 is initially mounted, the pin member 32 abuts the second ring member 24, pressing it toward the camera body 11 in the optical axis direction OA. Then, when the lens barrel 12 is engaged with the bayonet claw 21a, the pin member 32 moves toward the lens barrel 12 in the optical axis direction OA, thereby engaging the lens barrel 12. Because the pin member 32 applies force toward the lens barrel 12 in the optical axis direction OA, the pin member 32 maintains engagement with the lens barrel 12 as long as the pin release button 33 provided on the bayonet mount 13 is not operated.

[0047] Then, by operating the pin release button 33, the pin member 32 moves toward the camera body 11 in the optical axis direction OA. This releases the engagement of the lens barrel 12 with the pin member 32, and the lens barrel 12 can be removed.

[0048] Next, the locking method (locking method) and the unlocking method (unlocking method) of the lens barrel 12 using the locking member 22 are described. When the lens barrel 12 is locked to the bayonet device 13, the lens barrel 12 is installed and engaged with the latch claw 21a of the first ring member 21. In this state, by rotating the locking member 22 in the first direction R1, the lens barrel 12 engaged with 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, when releasing the locking of the lens barrel 12, by rotating the locking member 22 in the second direction R2, the pressure on the lens barrel 12 by the locking member 22 is released.

[0049] In the above embodiment, the lens barrel 12 is mounted on the bayonet mount 13. However, other accessories may be mounted on the bayonet mount 13. For example, an adapter ring may be mounted on the bayonet mount 13 as an accessory.

[0050] Explanation of symbols

[0051] 10-digital camera, 11-camera body, 12-lens barrel, 13-bayonet device, 14-release switch, 20-fixing component, 21-1st ring component, 21a-bayonet claw, 21b-through hole, 22-locking component, 22a-rotating lever, 22b-through hole, 24-2nd ring component, 24a-joining portion, 24b-screw, 26-1st inclined portion, 26a-starting portion, 26b-end portion, 28-2nd inclined portion, 28a-starting portion, 28b-end portion, 30-force-applying ring, 30a-force-applying portion, 30b-through hole, 30c-notch, 32-pin component, 33-pin release button, OA-optical axis, R1-1st direction, R2-2nd direction.

Claims

1. A bayonet device comprising: Fixed components; a first ring member, which engages with the accessory device when the accessory device is installed; and The locking member is rotatably supported and presses the first ring member engaged with the accessory device in the optical axis direction of the accessory device to lock the accessory device when rotated in a first direction, and releases the pressing when rotated in a second direction.

2. The bayonet device according to claim 1, wherein: The first ring member has a plurality of first inclined portions having varying thicknesses in the optical axis direction. The locking member has a plurality of second inclined portions having varying thicknesses in the optical axis direction. When the locking member is rotated in the first direction, the second inclined surface portion overlaps with the first inclined surface portion in the radial direction of the locking member, whereby the locking member is pressed in the optical axis direction.

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

4. The bayonet device according to claim 2, wherein: When the locking member is rotated in the first direction, the starting point of the second inclined surface portion rotates while pressing the first inclined surface portion whose thickness increases toward the first direction.

5. The bayonet device according to claim 1, wherein: The first ring member has a plurality of engaging portions for engaging with the accessory device. The engaging portion presses the accessory device by pressing the first ring member with the locking member.

6. The bayonet device according to claim 1, comprising a biasing portion for biasing the accessory device engaged with the first ring member. The urging portion is provided between a plurality of first inclined surface portions provided on the first ring member and having a varying thickness in the optical axis direction.

7. The bayonet device according to claim 1, wherein: The bayonet device includes a second ring member having a coupling portion for coupling with the first ring member in a state where the first ring member can be moved in the optical axis direction and the locking member can be rotated. The second ring member is fastened to the fixing member via a fastening member, The first ring member has a plurality of first inclined portions whose thickness in the optical axis direction changes from a starting portion to an end portion. An angle formed between the connecting portion and the end point of the first inclined portion is within 15°.

8. The bayonet device according to any one of claims 1 to 7, wherein: The bayonet device includes a second ring member having a coupling portion for coupling with the first ring member in a state where the first ring member can be moved in the optical axis direction and the locking member can be rotated. The locking member has an insertion hole formed along a radial direction of the locking member, through which the coupling portion is inserted.

9. The bayonet device according to claim 8, wherein: The insertion hole is formed so that a radial stroke of the locking member is within 40°. 10 . The bayonet device according to claim 1 , further comprising a pin member that is movable in the optical axis direction and engages with the accessory device.

11. The bayonet device according to claim 10, wherein: The bayonet device includes a second ring member having a coupling portion for coupling with the first ring member in a state where the first ring member can be moved in the optical axis direction and the locking member can be rotated. The locking member has an insertion hole formed along a radial direction of the locking member, through which the pin member and the coupling portion are inserted. 12 . An imaging device comprising the mount device according to claim 1 .

Images