JP2023167798A - Lens holding device and lens cover - Google Patents

Abstract

To solve the problem in which: accessories need to be prepared in correspondence with lens barrels with different outer diameters, which lacks versatility; and although the accessories correspond to the lens barrels, they are complicated in structure and operations and may be mishandled.SOLUTION: A lens holding device according to the present invention holds a lens ring of a lens barrel and rotates with the lens ring centered on an optical axis, and has: a pair of arm parts that hold an outer peripheral surface of the lens ring centered on the optical axis; and a mechanism that moves the pair of arm parts between a first state where the pair of arm parts approach each other to hold the lens ring and a second state where the pair of arm parts separate from each other to release the lens ring.SELECTED DRAWING: Figure 8

Description

The present invention relates to a lens gripping device that is attached to a lens ring that is provided on a lens barrel and performs zoom adjustment, focus adjustment, etc.

Conventionally, various accessories have been prepared for the lens barrel of an imaging lens attached to a camera depending on the imaging situation. Examples include a matte box that is attached to the tip of a lens barrel to prevent unnecessary light from entering the lens, and a lens cover that protects the lens barrel when taking images in the rain. Furthermore, there are a wide variety of types, such as a follow focus that is attached to the outer periphery of a lens ring, which is used when a different operator than the photographer operates a lens ring provided on a lens barrel, such as in movie shooting. On the other hand, since the overall optical length and outer diameter of lens barrels differ depending on the model, the following problems were encountered when attaching accessories. First, it is necessary to prepare multiple accessories corresponding to the differences in optical overall length and outer diameter for each model, which makes handling complicated and increases costs. Further, even when using a common accessory, it is necessary to attach another attachment to accommodate the difference in size, which increases cost and requires time and effort to attach and detach.

Therefore, it is an attachment that connects accessories such as matte boxes to lens barrels, and by changing the opening amount by opening and closing multiple blades like an aperture, it can be attached to lens barrels with different lens diameters. (For example, see Patent Document 1). According to this, the attachment has a mechanism that opens and closes the plurality of blades like an aperture by rotating the outer ring around the optical axis. Furthermore, a locking lever locks the outer ring in a fixed position. By using this, common accessories can be attached to lens barrels with different lens diameters.

International Publication No. 2019/203941

However, in the above conventional example, it is necessary to operate a lock lever to lock the outer ring after turning the outer ring, which makes the operation complicated and the structure complicated. Further, when the lens ring is attached to a lens ring having a different diameter, such as a follow focus, and used in an accessory where the lens ring is rotated by a rotation operation, the following problems may occur. In other words, the direction of rotation of the outer ring that opens and closes the blade and the lens ring is the same, so when rotating the lens ring, the outer ring may be accidentally rotated, causing the blade to release and come off from the lens ring. This is a problem due to incorrect operation.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a lens gripping device that can be easily attached to a plurality of lens barrels having lens rings with different outer diameters, and that is difficult to operate erroneously.

According to the present invention, the pair of arms grips the lens ring of the lens barrel, rotates together with the lens ring around the optical axis, and grips the outer peripheral surface of the lens ring around the optical axis; a mechanism for moving the pair of arms between a first state in which the arms are close to each other and grip the lens ring, and a second state in which the arms are separated from each other to release the lens ring. A lens gripping device is provided.

According to the present invention, the lens gripping device can be attached to a plurality of lens barrels with lens rings having different outer diameters, and can be gripped with a simple operation without the need for a separate locking mechanism, and is difficult to operate incorrectly. can be provided.

1 is a perspective view showing a state in which a waterproof lens cover using a gripping device according to a first embodiment of the present invention is attached to a camera; FIG. FIG. 2 is a perspective view of essential parts in the state shown in FIG. 1 in the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the waterproof lens cover according to the first embodiment of the present invention, viewed from the front. FIG. 2 is an exploded perspective view of the waterproof lens cover according to the first embodiment of the present invention, seen from the rear. FIG. 2 is a cross-sectional view taken along a plane perpendicular to the optical axis in the state shown in FIG. 1 in the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the lens gripping device according to the first embodiment of the present invention, viewed from the front. FIG. 2 is an exploded perspective view of the lens gripping device according to the first embodiment of the present invention, seen from the rear. FIG. 3 is a sectional view seen from the rear, showing a lens ring gripping state of the lens gripping device according to the first embodiment of the present invention. FIG. 7 is a perspective view showing a state in which a camera using a lens gripping device according to a second embodiment is attached to a camera rig.

Embodiments of the present invention will be described below.

(First embodiment)
The first embodiment will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a state in which a waterproof lens cover equipped with a lens gripping device is attached to a camera to which an interchangeable lens is attached, in an embodiment of the lens gripping device according to the present embodiment. In FIG. 1, a camera body 100 and a waterproof lens cover 400 are shown, and the waterproof lens cover 400 mainly includes a fixed part 401, a lens gripping device 300, a rotating part 410, and a filter cover 430.

FIG. 2 shows how the lens gripping device 300 grips the zoom ring 203 in the state of FIG. 1 in this embodiment, with the fixed part 401, rotating part 410, filter cover 430, etc. not shown for explanation. FIG. 3 is a perspective view of main parts. In FIG. 2, a lens gripping device 300 is shown attached to the outer periphery of a zoom ring 203 of a lens barrel 200.

The camera body 100 has an image sensor (not shown) inside, has an opening (not shown) so that light enters the image sensor, and has a lens barrel 200 detachably fixed around the opening. A lens mount 101 is provided. The camera body 100 further includes a lens cover mount 102 having a larger diameter than the lens mount 101, and the waterproof lens cover 400 is detachably fixed to the camera body 100. In the following description, the side of the lens mount 101 that is the imaging direction of the camera body 100 will be referred to as the front, and the opposite side will be referred to as the rear. Note that the casing of the camera body 100 has a waterproof structure except for the opening. As the waterproof structure, a well-known structure that has been conventionally used in the housings of various electronic devices can be adopted.

The lens barrel 200 is an inner zoom lens whose total optical length remains unchanged. The lens barrel 200 includes a fixed lens barrel section 201 having a mount section that is removably attached to the lens mount 101 of the camera body 100, and a zoom ring 203 that is rotatably disposed coaxially with the fixed lens barrel section 201. . By rotating the zoom ring 203, the internal lens group moves, and the zoom can be adjusted between the smallest zoom ratio (W end) and the largest zoom ratio (T end).

FIG. 3 is an exploded perspective view of the waterproof lens cover 400 in this embodiment seen from the front, FIG. 4 is an exploded perspective view of the waterproof lens cover 400 in this embodiment seen from the rear, and FIG. 5 is an exploded perspective view of the waterproof lens cover 400 in this embodiment seen from the rear. FIG. 2 is a sectional view taken along a vertical plane of the optical axis in FIG. 1 . As shown in FIGS. 3 to 5, the waterproof lens cover 400 is a hollow cylindrical case body that can accommodate the lens barrel 200 attached to the camera body 100. The waterproof lens cover 400 allows the lens barrel 200 to be loosely inserted into the inner periphery.

The fixing part 401 consists of a cover-side mount part 402 that is removably attached to the lens cover mount 102 of the camera body 100, a fixing cylinder member 403, and a waterproof tape 404, and the cover-side mount part 402 and the fixing cylinder member 403 are made of waterproof tape. It is fixed with screws 405 while compressing 404. The waterproof tape 404 is a tape member that has high followability and prevents water from entering, and serves to provide waterproofing between the cover-side mount portion 402 and the fixed cylinder member 403 (it serves as a second seal portion). Although a waterproof tape is used in this embodiment, a sealing member such as an O-ring may be used, or the cover-side mount portion 402 and the fixed cylinder member 403 may be integrally formed. The cover side mount section 402 is attached to the lens cover mount 102 of the camera body 100 using a known bayonet method while pressing an O ring 406 between the cover side mount section 402 and the camera body 100 to ensure waterproofing between the cover side mount section 402 and the camera body 100. (This is the first seal portion).

The rotating part 410 is made up of a cylindrical rotating tube member 411, a waterproof tape 412, an O-ring 413, and a rotating plate 414, and is screwed to the lens gripping device 300 so that it rotates around the optical axis together with the lens gripping device 300. It is possible. The rotating cylinder member 411 has a flange portion 411a around the rear opening, and is fixed to the lens gripping device 300 with screws 415 while compressing a waterproof tape 412 between the flange portion 411a and the lens gripping device 300. The waterproof tape 412 is a tape member that has high followability and prevents water from entering, and serves to provide waterproofing between the rotary cylinder member 411 and the lens gripping device 300 (it serves as a third seal). As shown in FIG. 5, the rotating plate 414 is disposed behind the annular rib 403a formed on the inner surface of the rear opening of the fixed cylinder member 403, and is fixed to the lens gripping device 300 with screws 416. The lens gripping device 300 contacts the front surface 403b of the fixed cylinder member 403, and slides while sandwiching the fixed cylinder member 403 between the lens gripping device 300 and the rotary plate 414, so that the rotating part 410 and the lens gripping device 300 are aligned with the optical axis. It is possible to rotate while maintaining the directional position. The O-ring 413 is arranged between the fixed cylinder member 403 and the lens gripping device 300 to provide waterproofing between the fixed cylinder member 403 and the lens gripping device 300 (it serves as a fourth seal portion).

The front opening 411b of the rotating barrel member 411 is closed with a transparent filter 420, allowing external light to enter the lens barrel 200 inside. The rotary cylinder member 411 has a male thread formed on its front outer periphery, which fits into a female thread formed on the inner surface of the filter cover 430. The filter cover 430 is fixed to the rotary cylinder member 411 by screw fitting while compressing the transparent filter 420 and the circular frame-shaped sealing member 421. The sealing member 421 is a cushion member having a fine cell structure, and provides waterproofing between the filter cover 430 and the rotary cylinder member 411 (it serves as a fifth sealing portion). Note that in this embodiment, the sealing member 421 is a cushion member, but a sealing member such as an O-ring may also be used.

The lens gripping device 300 has a hollow circular shape and can grip zoom rings having different diameters depending on the lens model, and rotates around the optical axis while gripping the zoom rings. By rotating the lens gripping device 300 around the optical axis, the rotating section 410, filter cover 430, and transparent filters 420 are also rotated together.

FIG. 6 is an exploded perspective view of the lens gripping device 300 seen from the front, and FIG. 7 is an exploded perspective view of the lens gripping device 300 seen from the rear. 6 and 7, a ring base 310, a right arm 320, a left arm 330, a ring cover 340, an operation unit 350, an arm sliding shaft 360, a screw 370, and a waterproof tape 380 are shown. The right arm 320 and the left arm 330 have an arc shape.

The ring base 310 is a hollow, substantially circular case member, and has a gear-shaped outer peripheral surface. Further, it has a concave portion 312 on a part of the outer periphery, and further has a hole 313 approximately in the center of the concave portion 312 in which an operating knob 351, which will be described later, is accommodated. Inside the ring base 310, there are a sliding rib 314 on which the right arm 320 and the left arm 330 slide, a support part 315 that supports the operation unit 350, a shaft support part 316 that supports the arm sliding shaft 360, and a screw 370. A fixing boss portion 317 and an abutment rib 318 are formed. A right arm 320, a left arm 330, an operation unit 350, and an arm sliding shaft 360 are housed inside the ring base 310, and are covered with a ring cover 340. A waterproof tape 380 is provided between the contact surfaces of the ring base 310 and the ring cover 340 so as to surround it, and is fixed with screws 370 while compressing the waterproof tape 380. The waterproof tape 380 is a tape member that has high followability and prevents water from entering, and prevents water from entering from the outside between the ring base 310 and the ring cover 340 (it serves as the first sealing part of the lens gripping device).

The ring cover 340 is a hollow, generally disk-shaped member, and has a concave portion 341 similar to the concave portion 312 of the ring base 310, and has a screw hole 346 through which the threaded portion of the screw 370 is inserted. . On the front surface of the ring cover 340, there is a sliding rib 342 on which the right arm 320 and the left arm 330 slide, removal prevention ribs 343 and 344 to prevent the operation unit 350 from coming off from the support part 315, and an arm sliding shaft 360. A slip-off prevention rib 345 is formed to prevent the support portion 316 from slipping off.

The operation unit 350 includes an operation knob 351 that rotates around an axis perpendicular to the optical axis, a right worm part 353, a left worm part 354, and a pair of parts that transmit the rotation of the operation knob 351 to the right worm part 353 and the left worm part 354. It consists of a transmission part 352 and a pair of O-rings 355. FIG. 8 is a sectional view of the center of rotation of the operating knob 351 when viewed from the rear, showing the lens ring gripping state of the lens gripping device 300. 8(a) shows a released state, FIG. 8(b) shows a state where the lens barrel 200 is gripped, and FIG. 8(c) shows a state where the lens ring with the smallest diameter is gripped. As shown in FIG. 8A, the operating knob 351 is housed in the hole 313 of the ring base 310, and a portion of the operating knob 351 protrudes upward from the hole 313. A portion of the operation knob 351 protruding from the hole 313 is located between the concave portion 312 of the ring base 310 and the outer circumference of the ring base 310, and does not protrude beyond the outer circumference of the cross section of the ring base 310. do not have. As shown in FIGS. 6 and 7, keyway-shaped holes 351a and 351b are formed on the left and right side surfaces of the operation knob 351, and a key-shaped hole 352a formed in the transmission section 352 is fitted into each hole. As shown in FIG. 7, the hole portion 313 has a hole shape 313a that passes through the ring base 310 from side to side. When assembling the operation unit 350, after storing the operation knob 351 in the hole 313, insert the transmission section 352 from the left and right sides of the hole shape 313a, and insert the transmission section 352 into the keyway-shaped holes 351a and 351b of the operation knob 351. The key shape 352a is fitted. O-rings 355 are fitted into the left and right transmission parts 352, and by inserting the transmission parts 352 into the hole shape 313a, water that enters the hole 313 from the outside can be prevented from entering the inside of the lens gripping device 300. This can be prevented (by the second seal part of the lens gripping device). A D-shaped groove 352b is formed on the opposite side of the key shape 352a of the transmission part 352, and the right worm part 353 and the left worm part 354 can be incorporated from the rear. D-shaped shaft parts 353a and 354a that fit into the D-shaped groove 352b of the transmission part 352 are formed at one ends of the right worm part 353 and the left worm part 354. At opposite ends of the right worm part 353 and the left worm part 354, circular shaft parts 353b and 354b that fit into the support part 315 of the ring base 310 are formed. By assembling the right worm part 353 and the left worm part 354 from the rear toward the support part 315 of the ring base 310 and the D-shaped groove 352b of the transmission part 352, the right worm part 353 and the left worm part 354 are inserted as the operation knob 351 rotates. The left worm portion 354 is also rotatable. Further, the right worm portion 353 is formed with a right-handed worm, and the left worm portion 354 is formed with a left-handed worm.

The right arm 320 and the left arm 330 are a pair of arm parts formed in an arch shape along the inner circumference of the ring base 310, and the end on the operation unit 350 side is connected to the right worm part 353 and the left worm part 354. Helical tooth shapes 321, 331 are formed to mesh with the worm. Further, sliding holes 322 and 332 through which an arm sliding shaft 360 is inserted are formed at the other ends of the right arm 320 and the left arm 330. In the center portions of the right arm 320 and the left arm 330, a flat portion substantially parallel to the optical axis is formed on the side surface on the lens side, and the flat portion is provided with gripping portions 323 and 333 for gripping the lens ring. ing. The gripping parts 323 and 333 are made of an elastic member such as rubber, and can grip the lens ring from the left and right sides and rotate the lens ring without slipping as the lens gripping device 300 rotates. In addition, the right arm 320 and the left arm 330 have first sliding grooves 324 and 334 on the front surface for sliding on the sliding rib 314 of the ring base 310, and sliding grooves on the rear surface for sliding on the sliding rib 342 of the ring cover 340. It has second sliding grooves 325 and 335. As a result, the right arm 320 and the left arm 330 can slide toward or away from each other around the optical axis by rotating the right worm section 353 and the left worm section 354.

In the released state of FIG. 8A, the helical tooth shape 321 of the right arm 320 is located at the left end of the right worm section 353 in the figure, and the helical tooth shape 331 of the left arm 330 is located at the left end of the left worm section 354 in the figure. It is located at the middle right end, and the right arm 320 and left arm 330 are in the most distant state. At this time, the sliding hole 322 of the right arm 320 is located at the left end of the shaft support section 316 in the drawing, and the sliding hole 332 of the left arm 330 is located at the right end of the shaft support section 316 in the drawing. When the operating knob 351 is rotated backward (toward the front in the figure) from the state shown in FIG. The arm 330 begins to move toward the center of the optical axis. Note that even if you try to rotate the operation knob 351 forward (towards the back in the figure) from the state shown in FIG. Since it comes into contact with the shaft support part 316, it cannot be rotated. When the operation knob 351 is rotated backward and the grip portion 323 of the right arm 320 and the grip portion 333 of the left arm 330 come into contact with the zoom ring 203 of the lens barrel 200, the state shown in FIG. 8(b) is achieved. . Here, when an attempt is made to further rotate the operation knob 351 backward, the sliding holes 322 and 332 of the right arm 320 and the left arm 330 slide on the arm sliding shaft 360 using the gripping parts 323 and 333 as fulcrums. A load is applied in the direction in which the right arm 320 and the left arm 330 open in a figure eight shape. Although rotational operation becomes impossible when a certain amount of load is applied, the lower ends of the right arm 320 and left arm 330 in FIG. 8 are not fixed and slide, thereby reducing the load on the zoom ring 203 in the gripping direction. I can do it. In addition, in the present invention, the lower end portion in FIG. 8 may be fixed. Further, the left and right arms may have a shape in which the grip portion and the upper end portion in the figure are connected without having the lower end portion in the figure.

In FIG. 8, the gripping portion 323 and the gripping portion 333 are depicted as coming into contact with the zoom ring 203 of the lens barrel 200 on a flat surface, but the present invention is not limited to this, and they may contact on a curved surface. . Further, the flat surfaces of the gripping portion 323 and the gripping portion 333 may be roughened (to increase the force applied to the zoom ring).

Here, the worm gear, which is a mechanism consisting of a combination of a worm and a helical gear, is generally known to have a self-lock feature, and the worm cannot be rotated from the helical gear side. Therefore, since the right arm 320 and the left arm 330 can only be moved by rotating the operation knob 351, it is possible to grip the zoom ring 203 without adding a locking mechanism.

As shown in FIG. 8B, by rotating the lens gripping device 300 around the optical axis while gripping the zoom ring 203, the zoom ring 203 can be rotated. Note that since the protrusion of the operation knob 351 is located between the concave portion 312 of the ring base 310 and the outer circumference of the ring base 310, it is difficult to touch the operation knob 351 with your finger when rotating the lens gripping device 300. It becomes difficult. Therefore, there is no possibility that the operating knob 351 is rotated by mistake while the lens gripping device 300 is being rotated. To release the grip on the zoom ring 203, rotate the operation knob 351 forward (toward the back in the figure) from the state shown in FIG. 8(b) to separate the right arm 320 and the left arm 330 around the optical axis. to the state shown in FIG. 8(a).

Similarly, when gripping lens barrels with lens rings having different outer diameters, the operation knob 351 is rotated backward to grip the right arm 320 and the left arm 330 close to the optical axis center. As shown in FIG. 8(c), the helical tooth shape 321 of the right arm 320 is located at the right end of the right worm portion 353 in the diagram, and the helical tooth shape 331 of the left arm 330 is located at the left end of the left worm portion 354 in the diagram. The right arm 320 and the left arm 330 can be brought close to each other until they are positioned. At this time, the lower ends of the right arm 320 and the left arm 330 in the drawing come into contact with the abutment rib 318 of the ring base 310, so that the operation knob 351 cannot be rotated any further. The zoom ring 260 shown in FIG. 8(c) has the smallest ring diameter that can be held by the lens holding device 300.

In this way, even when using lens barrels with different ring diameters, using the lens gripping device 300 makes it possible to easily grip and perform zoom operations. Further, since a gear shape is formed on the outer peripheral surface of the ring base 310, electric operation is also possible using a gear that meshes with the gear shape.

Furthermore, a first seal using an O-ring 406 makes the connection between the cover-side mount 402 and the camera body 100 waterproof, and a second seal using a waterproof tape 404 makes the connection between the cover-side mount 402 and the camera body 100 waterproof. Waterproofing between the portion 402 and the fixed cylinder member 403 is achieved. Further, the space between the lens gripping device 300 and the rotating tube member 411 is made waterproof by a third seal using a waterproof tape 412, and the connecting portion between the fixed tube member 403 and the lens gripping device 300 is made waterproof using an O-ring 413. Waterproofing is achieved by the fourth seal portion using. Additionally, a fifth seal section using a sealing member 421 provides waterproofing between the rotary cylinder member 411 and the filter cover 430. In the lens gripping device 300 as well, the space between the ring base 310 and the ring cover 340 is made waterproof by the first seal portion of the lens gripping device using the waterproof tape 380. Further, a second seal portion of the lens gripping device using an O-ring 355 provides waterproofing between the transmission portion 352 connected to the operation knob 351 and the hole shape 313a. Therefore, even if the lens barrel does not have a waterproof structure, by attaching the waterproof lens cover 400, it is possible to make the lens barrel and the joint between the lens barrel and the camera body 100 waterproof. It is. Furthermore, even with the waterproof lens cover 400 attached, it is possible to easily perform a zoom operation on the lens barrel 200.

In this embodiment, the lens cover is a waterproof lens cover that has a waterproof function, but the present invention is not limited to this, and can also be used as a lens protection cover that does not have a waterproof function. Furthermore, in this embodiment, a case has been described in which an inner zoom lens whose optical total length does not change is used, but the present invention is not limited to this, and even a zoom lens whose optical total length changes can be used as a waterproof lens cover. It is possible to use Further, in this embodiment, the lens gripping device is used for gripping a zoom ring, but the present invention is not limited to this, and can also be used for a focus ring or an aperture ring. Furthermore, by using the fixed cylinder member 403 and the rotary cylinder member 411 as flexible cover members that can be expanded and contracted, the lens gripping device 300 can be moved in the optical axis direction, and the lens barrel can be attached to a lens barrel with a different lens ring position. It is also possible to use

(Second embodiment)
Next, a second embodiment of the present invention will be described. In the second embodiment, unlike the first embodiment, a rig 600 for holding the ring operating device 500 and the camera body 100 is provided. The second embodiment will be described below, focusing on the differences from the first embodiment. In the following description, the same reference numerals as in the first embodiment are assumed to have the same configuration as in the first embodiment, and the description thereof will be omitted.

FIG. 9 is a perspective view of a camera in which the lens gripping device according to the present embodiment is attached to a lens barrel, and the camera is attached to a camera rig. In FIG. 9, a ring operating device 500 and a rig 600 for holding the ring operating device 500 and the camera body 100 are shown. The ring operating device 500 is an accessory device for rotating a lens ring such as an electric follow focus device, and includes a gear portion 502 that meshes with a gear on the outer periphery of the ring base 310. The rig 600 has a base portion 601 to which the camera body 100 is attached, an accessory base 602 to which the ring operating device 500 is attached, and a rod 603 that supports them movably in the optical axis direction. The ring operating device 500 is attached to the accessory base 602 and is rotatable around the shaft portion 501. It is movable between a first position where the gear portion 502 is engaged with the lens gripping device 300 and operated, and a second position away from the lens gripping device 300, and is fixed with a bolt or the like in each position.

To attach the ring operating device 500, first, the camera body 100 with the lens holding device 300 attached to the lens barrel 200 is fixed to the base portion 601 with screws. Thereafter, with the ring operating device 500 fixed at the second position, the accessory base 602 is moved in the optical axis direction on the rod 603 to a position where it engages with the lens gripping device 300. Then, by rotating and fixing the ring operating device 500 to the first position, the state shown in FIG. 9 where the lens gripping device 300 and the gear portion 502 are engaged is achieved.

According to the second embodiment, by operating the ring operating device 500, the lens gripping device 300 can be rotated and the zoom ring 203 can be remotely controlled. Furthermore, when the lens barrel is replaced, the outer diameter of the lens gripping device 300 does not change, so there is no need to change the position of the ring operating device 500, and the accessory base 602 can be moved in the optical axis direction according to the position of the lens ring. Just move it. As a result, even if a lens barrel with a different lens ring position or outer diameter is used, the rig can be rebuilt with minimal modifications, eliminating the need for image capture due to lens exchange.

(Other embodiments)
Although the present invention has been described above in detail based on its preferred embodiments, the present invention is not limited to these specific embodiments, and the present invention may take various forms without departing from the gist of the present invention. included. Some of the embodiments described above may be combined as appropriate.

100 Camera body 101 Lens mount 102 Lens cover mount 200 Lens barrel A
201 Fixed lens barrel portion 203 Zoom ring 260 Zoom ring 300 Lens gripping device 310 Ring base 312 Concave portion 313 Hole portion 320 Right arm 321, 331 Helical tooth shape 323, 333 Grip portion 330 Left arm 360 Arm sliding shaft 370 Screw 340 Ring cover 350 Operation unit 351 Operation knob 352 Transmission part 353 Right worm part 354 Left worm part 355 O-ring 380 Waterproof tape 400 Waterproof lens cover 401 Fixed part 402 Cover side mount part 403 Fixed cylinder member 404 Waterproof tape 405 Screw 406 O-ring 410 Rotating part 411 Rotating tube member 412 Waterproof tape 413 O-ring 414 Rotating plate 415 Screw 416 Screw 420 Transparent filter 421 Sealing member 430 Filter cover 500 Ring operation device 501 Shaft part 502 Gear part 600 Rig 601 Base part 602 Base accessory 603 Rod

Claims (12)

Grip the lens ring of the lens barrel and rotate it together with the lens ring around the optical axis.
a pair of arms that grip the outer peripheral surface of the lens ring with the optical axis as the center;
a mechanism for moving the pair of arms between a first state in which the pair of arms are close to each other and grip the lens ring, and a second state in which they are separated from each other to release the lens ring; A lens gripping device comprising: The mechanism includes a helical tooth shape provided at one end of the pair of arms, a pair of worms that mesh with the helical tooth shape, and an operation rotatably supported by connecting the pair of worms from side to side. 2. The lens gripping device according to claim 1, comprising a knob, and wherein the pair of worms are twisted in opposite directions. 3. The lens gripping device according to claim 2, wherein the operation knob rotates around an axis perpendicular to the optical axis of the lens barrel. The mechanism is housed in a cylindrical case body centered on an optical axis into which the lens barrel can be loosely inserted, and a lid, and the pair of arms are housed in the case body in a second state. 2. The lens gripping device according to claim 1, wherein the lens gripping device projects from the case body toward the optical axis in the first state. The case body has a concave shape on a part of the outer periphery, and a part of the operation knob protrudes outside the concave shape, and does not protrude beyond the outer circumference of the cylindrical cross section. The lens gripping device according to claim 4. 5. The lens gripping device according to claim 4, wherein the pair of arm portions have an arc shape that is accommodated within the cylindrical shape of the case body. The lens gripping device according to claim 1, wherein the pair of arm portions have a grip portion that grips the lens ring. Either the case body or the lid has a shaft support portion on the opposite side of the operation knob and the optical axis,
further comprising a shaft part supported by the shaft support part,
5. The lens gripping device according to claim 4, wherein the pair of arm portions have a hole through which the shaft portion is inserted. 5. The lens gripping device according to claim 4, wherein a gear shape is formed on the outer peripheral surface of the case body. A ring is provided between the case body and the lid, a first seal portion for pinching the ring is provided, and a second seal portion is provided at a connection portion between the operation knob and the case body. The lens gripping device according to claim 5, characterized in that: A lens cover that can be attached to a camera device equipped with a lens barrel and that covers the lens barrel, wherein a part of the lens cover is provided with the lens according to any one of claims 1 to 10. A lens cover, characterized in that a lens gripping device is rotatably connected and can grip a lens ring of the lens barrel. The lens cover includes a fixed part attached to a camera device, a lens holding device according to claim 10, a cover part connected to the lens holding device, and an opening provided at the tip of the lens of the cover part. A third seal part is provided between the fixing part and the camera device, a fourth seal part is provided between the fixing part and the lens gripping device, and the lens gripping device and the cover are provided with a filter for a lid. The lens cover according to claim 11, characterized in that a fifth seal portion is provided between the members and a sixth seal portion is provided between the cover member and the filter.

Images