JP2004271690A - Lens attaching device of camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera lens attaching device capable of tightly attaching a lens to a camera body. <P>SOLUTION: An attaching device 3 for fixing a lens 21 to a camera body 111 is provided with a bayonet mount 31 formed on a camera mounting part 12; a mount ring 32 formed on the outside of the bayonet mount 31 so as to cover the mount 31, screwed into the bayonet mount 12 so as to be turned between a 1st position on which at least the lens can be attached/detached to/from the bayonet mount 31 and a 2nd position on which the lens can be locked and having a plurality of sawtooth ratchet grooves 324 formed on the outer peripheral surface along an axial direction; and a ratchet claw 33 formed on a camera body so as to be turned in a state elastically energized in the clamping direction of a mount ring 32, made to be turned so that a tip claw exceeds the ratchet grooves against elasticity when the mount ring 32 is turned in the clamping direction and made to be turned so that the tip claw is engaged with the ratchet groove in accordance with the elasticity when the mount ring 32 is turned in the opposite direction to the clamping direction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lens mounting device for detachably mounting a lens on a main body of various cameras such as a video camera, and in particular, a camera used in an environment subject to vibration such as an inspection camera or a monitoring camera in a manufacturing process. The present invention relates to a lens mounting device which is preferably applied to the present invention.
[0002]
[Prior art]
2. Description of the Related Art As an attachment device for attaching a replacement lens to a main body of a video camera of this type, a device employing a bayonet mount and a mount ring is known.
[0003]
[Problems to be solved by the invention]
However, the lens mounting device employing the bayonet mount and the mount ring is formed on the outer peripheral surface of the bayonet mount with the bayonet claw formed at the base end of the lens interposed between the bayonet mount and the mount ring. Since the lens is attached by tightening the screw and the screw formed on the inner peripheral surface of the mount ring, there is a problem that if the fastening force is weak, the lens is loosened by vibration or the like, and the lens is not held firmly. In particular, this problem is remarkable when the camera is used in an environment where it is subject to vibration.
[0004]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera lens mounting device capable of firmly mounting a lens on a camera body.
(1) According to a first aspect of the present invention, there is provided a mounting device for mounting a lens on a camera body, wherein the mounting device is provided on a mounting portion of the camera, and covers a bayonet mount outside the bayonet mount. And an outer peripheral surface that is rotatably screwed to the bayonet mount with respect to the bayonet mount at least between a first position where the lens can be attached and detached and a second position where the lens can be locked. A mount ring formed with a plurality of sawtooth-shaped ratchet grooves along an axial direction; and a rotatably provided on the camera body in a state where the mount ring is elastically biased in a tightening direction of the mount ring. When turned, the claw at the tip rotates against the ratchet groove against the elasticity and tightens the mount ring. Only when the direction is rotated in a direction opposite to a lens mounting apparatus of a camera and a ratchet pawl pawl tip engages the ratchet grooves in accordance with the elasticity is provided.
[0005]
In this case, although not particularly limited, it is more preferable that the ratchet pawl is provided with a lever for rotating the ratchet pawl against the elasticity.
[0006]
In the camera lens mounting device of the present invention, when the mount ring is rotated in the tightening direction with respect to the bayonet mount with the base end portion of the lens being sandwiched between the bayonet mount and the mount ring, the lens is rotated around the camera body. The movably provided ratchet pawl pivots past a serrated ratchet groove formed on the outer peripheral surface of the mount ring, but once the mount ring is tightened tightly, the mount ring is reversed (ie, loosened). Direction), the ratchet pawl engages with the serrated ratchet groove to prevent the mount ring from loosening. Thereby, even if vibration or the like is applied to the camera body or the lens, loosening of the bayonet mount and the mount ring is prevented, and the lens can be firmly held.
[0007]
In addition, if a ratchet pawl is provided with a lever that rotates the ratchet pawl against elasticity, and the lever is operated to loosen the mount ring in a state where the ratchet pawl and the serrated ratchet groove are disengaged, The lens can be easily removed from the camera body.
(2) According to a second aspect of the present invention, there is provided a mounting device for mounting a lens on a camera main body, wherein the mounting device is provided on a mounting portion of the camera, and covers a bayonet mount outside the bayonet mount. A mount ring provided and rotatably screwed to the bayonet mount with respect to the bayonet mount at least between a first position at which the lens can be attached and detached and a second position at which the lens can be locked. A block that is provided near the mount ring of the camera body and forms a wedge-shaped gap between the outer peripheral surface of the mount ring and the mount ring that becomes sharp in a direction opposite to a tightening direction; A wedge-shaped member, which is rotatably provided on the camera body and has an elasticity and engages with the wedge-shaped gap, is connected to the camera body. Said wedge member is engaged with the wedge-shaped gap, said wedge-shaped member and is rotated in the other operating lever which is withdrawn from the wedge-shaped gap, the camera lens mounting device provided with a provided with.
[0008]
In the camera lens mounting device of the present invention, after the base end of the lens is sandwiched between the bayonet mount and the mount ring, the mount ring is rotated in the tightening direction with respect to the bayonet mount, and then tightly tightened. If the wedge-shaped member is engaged with the wedge-shaped gap by using the operation lever, the wedge-shaped member will bite into the wedge-shaped gap even if the mount ring is rotated in the loosening direction. it can. Thereby, even if vibration or the like is applied to the camera body or the lens, loosening of the bayonet mount and the mount ring is prevented, and the lens can be firmly held.
[0009]
If the mount ring is loosened after the wedge-shaped member is pulled out from the wedge-shaped gap using the operation lever, the lens can be easily removed from the camera body.
(3) According to a third aspect of the present invention, there is provided a mounting device for mounting a lens on a camera body, wherein the mounting device is provided on a mounting portion of the camera, and is provided so as to cover the outside of the bayonet mount. The bayonet mount is screwed to the bayonet mount so as to be rotatable at least between a first position at which the lens can be attached and detached and a second position at which the lens can be locked. A mount ring having a rotation lever; and a locking panel fixed to the camera body and formed with a long hole through which the rotation lever can pass in a rotation range of the mount ring. Has a shaft portion fixed to the mount ring, and a tip portion screwed to the shaft portion and pressed against the locking panel. Lens mounting apparatus is provided for camera.
[0010]
In the camera lens mounting device of the present invention, the base end of the lens is sandwiched between the bayonet mount and the mount ring, and the mount ring is tightened with respect to the bayonet mount in a state in which the tip of the rotating lever is loosened. After rotating and tightening tightly, tighten the tip of the rotating lever and press it against the locking panel, if you try to rotate the mounting ring in the loosening direction, lock the tip of the rotating lever with the locking Since the panel is crimped, the mounting ring can be prevented from loosening. Thereby, even if vibration or the like is applied to the camera body or the lens, loosening of the bayonet mount and the mount ring is prevented, and the lens can be firmly held.
[0011]
The lens can be easily removed from the camera body by loosening the tip of the rotating lever to release the pressure contact with the locking panel.
(4) According to a fourth aspect of the present invention, there is provided a mounting device for mounting a lens on a camera body, wherein the mounting device is provided on a mounting portion of the camera, and is provided so as to cover the outside of the bayonet mount. The bayonet mount is screwed to the bayonet mount so as to be rotatable at least between a first position at which the lens can be attached and detached and a second position at which the lens can be locked. A mount ring formed with a plurality of engagement recesses, a ball plunger provided on the camera body in a state of being elastically biased toward the mount ring, and capable of engaging with the engagement recess of the mount ring; Provided is a camera lens mounting device comprising:
[0012]
In the camera lens mounting device of the present invention, when the mount ring is rotated in the tightening direction with respect to the bayonet mount while the base end of the lens is sandwiched between the bayonet mount and the mount ring, the ball plunger becomes The ball plunger comes and goes over the engagement recess of the mount ring, but if the mount ring is tightened tightly, the ball plunger engages with the engagement recess even if the mount ring is rotated in the opposite direction (that is, in the loosening direction). To prevent the mount ring from loosening. Thereby, even if vibration or the like is applied to the camera body or the lens, loosening of the bayonet mount and the mount ring is prevented, and the lens can be firmly held.
[0013]
If the mount ring is loosened with a large force, the lens can be removed from the camera body.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a camera according to an embodiment of the present invention, FIG. 2 is a perspective view showing a lens mounting portion of a camera body according to the embodiment of the present invention, and FIG. 3 is a lens base according to the embodiment of the present invention. 4A is a front view, FIG. 4B is a side view, and FIG. 4 is a cross-sectional view showing a camera body (a bayonet mount and a mount ring) and a lens base end according to the embodiment of the present invention.
[0015]
With reference to FIGS. 1 to 4, a description will be given of a lens mounting structure using a bayonet mount 31 and a mount ring 32 common to the first to fourth embodiments of the present invention. As shown in FIG. 1, the camera 1 has a camera main body 11 and a lens 21, and the mounting portion 12 and the lens 21 of the camera main body 11 are detachable by the mounting device 3. The mounting device 3 includes a bayonet mount 31 and a mount ring 32 provided on the camera body 11 side as shown in FIG. 2, and a bayonet claw 22 provided on a base end portion on the lens 21 side as shown in FIG. It consists of.
[0016]
The bayonet mount 31 is fixed to the camera body 11 using a screw or the like, and a screw 311 to be screwed with a screw 321 formed on the inner peripheral surface of the mount ring 32 is formed on the outer peripheral surface. Thereby, the mount ring 32 can be tightened or loosened with respect to the bayonet mount 31. The rotation lever 43 protruding from the outer peripheral surface of the mount ring 32 is a lever that is gripped and used by a user when the mount ring 32 is tightened or loosened.
[0017]
The mount ring 32 is screwed (screw 311, 321) so as to cover the outside of the bayonet mount 31, and the opening 322 has three bayonet claws 22 formed at the base end of the lens 21. Are formed in three cutouts 323 for receiving the notches. Thus, after each of the three bayonet claws 22 formed at the base end of the lens 21 is inserted into the three cutouts 323 and inserted, the mount ring 32 is gripped by the rotation lever 43 or the like. By tightening, the bayonet claw 22 is fastened by screw connection in a state where the bayonet claw 22 is sandwiched between the portion of the mount ring 32 where the notch 323 is not formed and the bayonet mount 31.
[0018]
The above is the lens mounting structure using the bayonet mount 31 and the mount ring 32 common to all of the first to fourth embodiments of the present invention described below. A structure specific to the mounting device, that is, a structure for preventing the mounting ring 32 from loosening with respect to the bayonet mount 31 will be described.
[0019]
First Embodiment FIG. 5A is a side view, FIG. 6B is a front view showing a lens mounting device of a camera according to a first embodiment of the present invention, and FIG. 6 is a camera according to the first embodiment. FIG. 6 is a diagram showing the lens mounting device of FIG. 5, and is an end view along the line VI-VI in FIG.
[0020]
In the camera lens mounting device according to the present embodiment, a plurality of sawtooth-shaped ratchet grooves 324 are formed along the axial direction of the mount ring 32 all around the outer peripheral surface of the mount ring 32. In the vicinity of the mount ring 32 of the camera body 11, a ratchet claw 33 that engages with the serrated ratchet groove 324 of the mount ring 32 is rotatably supported.
[0021]
The ratchet claw 33 is always urged in the X direction in FIG. 6 by a tension coil spring 331 as shown in FIG. 6 as viewed from the back, and when this direction X is shown in FIG. The direction is the same as the tightening direction (clockwise) of the mount ring 32. Due to this spring bias, the ratchet pawl 33 always engages with the serrated ratchet groove 324 of the mount ring 32. When the mount ring 32 is rotated in the tightening direction X, the ratchet pawl 33 is The claw portion at the tip pivots so as to exceed the serrated ratchet groove 324 against the elasticity. However, when the mount ring 32 is rotated in the opposite direction to the tightening direction X to loosen, the claw portion at the tip engages with the saw-tooth ratchet groove 324 in accordance with the elasticity of the tension coil spring 331, whereby the mounting This prevents the ring 32 from loosening.
[0022]
As shown in FIGS. 5A and 6, the ratchet pawl 33 is provided with a lever 332. When the mount ring 32 is loosened and the lens 21 is removed, the lever 332 is shown in FIG. The mount ring 32 can be easily loosened by moving in the Y direction and separating the claw portion from the serrated ratchet groove 324.
[0023]
As described above, according to the camera lens mounting device of the present embodiment, the bayonet claw 22 formed at the base end of the lens 21 is sandwiched between the bayonet mount 31 and the mount ring 32, and the bayonet mount is mounted. When the mount ring 32 is rotated in the tightening direction X with respect to 31, the ratchet pawl 33 rotatably provided on the camera body 11 exceeds the saw-tooth ratchet groove 324 formed on the outer peripheral surface of the mount ring 32. However, if the mount ring 32 is tightened tightly, the ratchet claw 33 is engaged with the serrated ratchet groove 324 even if the mount ring 32 is rotated in the reverse direction, that is, in the loosening direction. Looseness of the mount ring 32 is prevented. This prevents the bayonet mount 31 and the mount ring 32 from being loosened even when vibration or the like is applied to the camera body 11 or the lens 21, and the lens 21 can be firmly held.
[0024]
By operating the lever 332 of the ratchet pawl 33 in the Y direction to loosen the mount ring 32 in a state where the ratchet pawl 33 and the serrated ratchet groove 324 are disengaged, the lens 21 can be easily moved from the camera body 11. Can be removed.
[0025]
Second Embodiment FIG. 7 is a (A) side view and (B) a front view showing a camera lens mounting device according to a second embodiment of the present invention.
[0026]
In the camera lens mounting apparatus according to the present embodiment, a block 34 is provided near the mount ring 32 of the camera body 11, and the mounting direction of the mount ring 32 is determined between the block 34 and the outer peripheral surface of the mount ring 32. Is formed with a wedge-shaped gap 35 that becomes sharper in the opposite direction. A wedge-shaped member 36 which is engaged with the wedge-shaped gap 35 and is formed of an elastic material such as rubber is connected to the operation lever 37 via a connection rod 38.
[0027]
The operation lever 37 is rotatably provided on the camera body 11, and when rotated in the X direction shown in the figure, the wedge-shaped member 36 engages with the wedge-shaped gap 35, and when rotated in the Y direction, the wedge-shaped member 36 is It can be pulled out from the wedge-shaped gap 35. Incidentally, reference numeral 39 shown in FIG.
[0028]
As described above, according to the camera lens mounting device of the present embodiment, the bayonet claw 22 formed at the base end of the lens 21 is sandwiched between the bayonet mount 31 and the mount ring 32, and the bayonet mount is mounted. The mount ring 32 is rotated in the tightening direction X relative to the mount 31 to tighten as tightly as possible.
[0029]
Thereafter, if the operation lever 37 is rotated in the X direction to engage the wedge-shaped member 36 with the wedge-shaped gap 35, the wedge-shaped member 36 bites into the wedge-shaped gap 35 even if the mount ring 32 is rotated in the loosening direction. Therefore, loosening of the mount ring 32 can be prevented. This prevents the bayonet mount 31 and the mount ring 32 from being loosened even when vibration or the like is applied to the camera body 11 or the lens 21, and the lens 21 can be firmly held.
[0030]
The lens 21 can be easily removed from the camera body 11 by rotating the operation lever 37 in the Y direction to pull out the wedge-shaped member 36 from the wedge-shaped gap 35 and then loosening the mount ring 32.
[0031]
Third Embodiment FIG. 8 is a (A) side view and (B) a front view showing a camera lens mounting device according to a third embodiment of the present invention.
[0032]
In the lens mounting apparatus for a camera according to the present embodiment, a locking panel 40 is fixed to the camera body 11 and provided along the outer peripheral surface of the mount ring 32 within the rotation range of the mount ring 32. The locking panel 40 has an elongated hole 401 through which the rotating lever 43 fixed to the outer peripheral surface of the mount ring 32 can pass. The rotating lever 43 fixed to the mount ring 32 has a shaft portion 431 fixed to the mount ring 32 and a distal end portion 432 that is screwed to the shaft portion 431 by a screw or the like and pressed against the locking panel 40. It is composed of Since the rotation lever 43 rotates in the same range as the rotation range of the mount ring 32, the long hole 401 of the locking panel 40 through which the shaft portion 431 passes is formed at least over this rotation range. I have.
[0033]
As described above, according to the camera lens mounting device of the present embodiment, the bayonet claw 22 formed at the base end of the lens 21 is sandwiched between the bayonet mount 31 and the mount ring 32, and the bayonet mount is mounted. The mount ring 32 is rotated in the tightening direction X relative to the mount 31 to tighten as tightly as possible.
[0034]
Then, the distal end portion 432 of the rotating lever 43 is fastened to the shaft portion 431 and pressed against the locking panel 40. Thus, even if the mounting ring 32 is to be rotated in the loosening direction, the tip end portion 432 of the rotation lever 43 and the locking panel 40 are pressed, so that the mounting ring 32 can be prevented from loosening. This prevents the bayonet mount 31 and the mount ring 32 from being loosened even when vibration or the like is applied to the camera body 11 or the lens 21, and the lens 21 can be firmly held.
[0035]
The lens 21 can be easily removed from the camera body 11 by loosening the distal end portion 432 of the rotating lever 43 and releasing the pressure contact with the locking panel 40.
[0036]
Fourth Embodiment FIG. 9 is a (A) side view and (B) a front view showing a lens mounting device for a camera according to a fourth embodiment of the present invention.
[0037]
In the lens mounting device of the camera according to the present embodiment, a plurality of engagement recesses 42 with which a ball plunger 41 described later can be engaged are formed on the outer peripheral surface of the mount ring 32. In this example, a plurality of groove-shaped engaging recesses 42 are formed along the axial direction of the mount ring 32, similarly to the ratchet groove 324 of the above-described first embodiment. In the vicinity of the mount ring 32 of the camera body 11, a ball plunger 41 that can be engaged with the above-described engagement recess 42 is provided in a state of being elastically biased toward the mount ring 32.
[0038]
As described above, according to the camera lens mounting device of the present embodiment, the bayonet claw 22 formed at the base end of the lens 21 is sandwiched between the bayonet mount 31 and the mount ring 32, and the bayonet mount is mounted. When the mount ring 32 is rotated in the tightening direction X with respect to the mount ring 31, the ball plunger 41 appears and disappears beyond the engagement concave portion 42 of the mount ring 32. However, if the mount ring 32 is tightened tightly, The ball plunger 41 engages with the engagement recess 42 even when the rotation of the mount ring 32 is performed in the opposite direction (that is, in the loosening direction Y), thereby preventing the mounting ring 32 from loosening. This prevents the bayonet mount 31 and the mount ring 32 from being loosened even when vibration or the like is applied to the camera body 11 or the lens 21, and the lens 21 can be firmly held.
[0039]
The lens 21 can be removed from the camera body 11 by loosening the mount ring 32 with a large force.
[0040]
The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[0041]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a camera lens mounting apparatus capable of firmly mounting a lens to a camera body.
[Brief description of the drawings]
FIG. 1 is a front view showing a camera according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a lens mounting portion of the camera body according to the embodiment of the present invention.
FIGS. 3A and 3B are a front view and a side view showing a base end portion of the lens according to the embodiment of the present invention; FIGS.
FIG. 4 is a cross-sectional view illustrating a camera body (a bayonet mount and a mount ring) and a lens base end according to the embodiment of the present invention.
FIGS. 5A and 5B are a side view and a front view, respectively, showing a lens mounting device for a camera according to the first embodiment of the present invention.
FIG. 6 is a diagram showing the lens mounting device of the camera according to the first embodiment of the present invention, and is an end view along the line VI-VI in FIG. 5 (B).
FIGS. 7A and 7B are a side view and a front view, respectively, showing a lens mounting device for a camera according to a second embodiment of the present invention.
FIGS. 8A and 8B are a side view and a front view, respectively, showing a lens mounting device for a camera according to a third embodiment of the present invention.
FIGS. 9A and 9B are a side view and a front view, respectively, showing a lens mounting device for a camera according to a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Camera 11 ... Camera main body 12 ... Mounting part 21 ... Lens 22 ... Bayonet claw 3 ... Mounting device 31 ... Bayonet mount 311 ... Screw 32 ... Mount ring 321 ... Screw 322 ... Opening 323 ... Notch 324 ... Serrated ratchet Groove 33 Ratchet claw 331 Tension coil spring 332 Lever 34 Block 35 Wedge-shaped gap 36 Wedge-shaped member 37 Operation lever 38 Connecting rod 39 Stopper 40 Locking panel 401 Slot 41 Ball ball plunger 42 … Engaging recess 43… rotating lever 431… shaft 432… tip

Claims (5)

A mounting device for mounting a lens to a camera body,
A bayonet mount provided on the mounting portion of the camera,
The device is provided so as to cover the outside of the bayonet mount, and is rotatable with respect to the bayonet mount at least between a first position at which the lens can be attached and detached and a second position at which the lens can be locked. A mount ring screw-coupled to the bayonet mount and having a plurality of sawtooth-shaped ratchet grooves formed in the outer peripheral surface along the axial direction;
The camera body is rotatably provided in a state in which the mount ring is elastically urged in the tightening direction. When the mount ring is rotated in the tightening direction, the ratchet at the tip against the elasticity is formed by the ratchet. A camera lens comprising: a ratchet pawl that pivots past the groove and engages the ratchet groove at the tip according to the elasticity when the mount ring is rotated in the direction opposite to the tightening direction. Mounting device. 2. The camera lens mounting device according to claim 1, wherein the ratchet pawl is provided with a lever for rotating the ratchet pawl against the elasticity. A mounting device for mounting a lens to a camera body,
A bayonet mount provided on the mounting portion of the camera,
The device is provided so as to cover the outside of the bayonet mount, and is rotatable with respect to the bayonet mount at least between a first position at which the lens can be attached and detached and a second position at which the lens can be locked. A mounting ring screwed to the bayonet mount,
A block that is provided near the mount ring of the camera body and forms a wedge-shaped gap between the outer peripheral surface of the mount ring and the mount ring that becomes sharp in a direction opposite to a tightening direction.
A wedge-shaped member, which is rotatably provided on the camera body and engages with the wedge-shaped gap, is connected to the camera body. A lens mounting device for a camera, comprising: a wedge-shaped member; and an operation lever for pulling out the wedge-shaped member from the wedge-shaped gap. A mounting device for mounting a lens to a camera body,
A bayonet mount provided on the mounting portion of the camera,
The device is provided so as to cover the outside of the bayonet mount, and is rotatable with respect to the bayonet mount at least between a first position at which the lens can be attached and detached and a second position at which the lens can be locked. A mount ring screwed to the bayonet mount and having a rotating lever on the outer peripheral surface;
A locking panel fixed to the camera body and formed with an elongated hole through which the rotation lever can pass in a rotation range of the mount ring,
A lens mounting device for a camera, wherein a rotation lever of the mount ring has a shaft fixed to the mount ring, and a distal end screwed to the shaft and pressure-bonded to the locking panel. A mounting device for mounting a lens to a camera body,
A bayonet mount provided on the mounting portion of the camera,
The device is provided so as to cover the outside of the bayonet mount, and is rotatable with respect to the bayonet mount at least between a first position at which the lens can be attached and detached and a second position at which the lens can be locked. A mount ring screwed to the bayonet mount and having a plurality of engagement recesses formed on an outer peripheral surface;
A lens mounting device for a camera, comprising: a ball plunger provided on the camera body in a state of being elastically biased toward the mount ring and capable of engaging with an engagement recess of the mount ring.

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