JP2023114776A - lens cover - Google Patents

Abstract

To provide a lens cover that has a simple configuration and is designed for various sizes of interchangeable lenses mounted on an imaging apparatus.SOLUTION: A lens cover 1 comprises: a first stationary barrel member 42 and a second stationary barrel member 43 that constitute a stationary member removably fixed to an imaging apparatus 100; a rotational operation member 40 that has engagement parts 44a to an engagement part 44c engaging with a zoom ring 11 of an interchangeable lens 10, and is rotationally operated around an optical axis O10 with respect to the stationary member; a conversion member (replacement member) 60 that has a male screw 61 engaging with a front end of the interchangeable lens 10, and is replaced according to the size of the interchangeable lens 10; a movable member 20 that has a magnetic part 23 rotatably supporting the conversion member 60 around the optical axis O10, and covers the interchangeable lens 10 from the front side; and a third stationary barrel member 31 and a movable barrel member 32 that connect the movable member 20 and the second stationary barrel member 43 to constitute a connection member extendable and contractible in the direction of the optical axis O10.SELECTED DRAWING: Figure 7

Description

The present invention relates to lens covers.

2. Description of the Related Art Some imaging devices are used with various interchangeable lenses attached. Also, when using an imaging device, the interchangeable lens may be covered with a lens cover. As a result, for example, when the imaging apparatus is used outdoors in bad weather, the interchangeable lens can be protected from rainwater and the like even if the interchangeable lens is not waterproofed. Also, some interchangeable lenses change their overall length during zoom adjustment. Depending on the total length of the interchangeable lens, interference between the interchangeable lens and the lens cover or vignetting may occur. Therefore, Patent Document 1 discloses a mechanism for expanding and contracting a lens cover according to the change in the total length of the interchangeable lens. This telescopic mechanism has a cam groove and a cam follower guided by the cam groove.

JP 2013-250418 A

However, in the lens cover (waterproof case) described in Patent Document 1, since the expansion limit of the lens cover depends on the shape and length of the cam groove, etc., it is not possible to sufficiently cope with changes in the total length of the interchangeable lens. It lacks versatility. In addition, the lens cover described in Patent Document 1 cannot sufficiently cope with interchangeable lenses having various lens diameters, that is, it can only be used for interchangeable lenses with one type of lens diameter. Furthermore, since the lens cover described in Patent Document 1 has a configuration including cam grooves and cam followers, the configuration is complicated and the number of parts increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens cover that is compatible with interchangeable lenses of various sizes to be attached to an imaging device and that has a simple configuration.

In order to achieve the above objects, the lens cover of the present invention is attached to an imaging device for capturing an image, and accommodates an interchangeable lens having a zoom ring that is rotatably operated around the optical axis of the imaging device during zoom adjustment. a fixing member that is detachably fixed to the imaging device; and an operation member that has a ring engaging portion that engages with the zoom ring and is rotated around the optical axis with respect to the fixing member. a replacement member that has a lens engaging portion that engages with the front end portion of the lens and is replaced according to the size of the replacement lens; and a support portion that supports the replacement member so as to be rotatable around the optical axis; It is characterized by comprising a movable member that covers the interchangeable lens from the front side, and a connecting member that connects the movable member and the fixed member and is expandable and contractable in the optical axis direction.

According to the present invention, it is possible to deal with interchangeable lenses of various sizes to be attached to an imaging apparatus, and the configuration is simplified.

1 is a front perspective view of an imaging device and an interchangeable lens; FIG. FIG. 3 is a front perspective view of a state in which the lens cover is attached to the imaging device; FIG. 4 is an exploded perspective view of the essential parts of the lens cover when viewed from the front side; FIG. 4 is an exploded perspective view of the essential parts of the lens cover as viewed from the rear side; FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2(a); It is a perspective view which shows the mounting process of a lens cover in order. It is a perspective view which shows the mounting process of a lens cover in order. FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2(a); FIG. 2B is a sectional view taken along the line CC in FIG. 2B; 7 is an enlarged view of a region [D] surrounded by a dashed line in FIG. 6. FIG. 7 is an enlarged view of a region [E] surrounded by a dashed line in FIG. 6. FIG. FIG. 3 is an exploded perspective view of a lens cover having a waterproof function as viewed from the front side; FIG. 4 is an exploded perspective view of a lens cover having a waterproof function as viewed from the rear side;

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 10. FIG. However, the configurations described in the following embodiments are merely examples, and the scope of the present invention is not limited by the configurations described in the embodiments.

<Structure of Imaging Device and Interchangeable Lens>
FIG. 1 is a front perspective view of an imaging device and an interchangeable lens. Note that FIG. 1A shows the state before the interchangeable lens is attached to the imaging apparatus. FIG. 1(b) shows that the interchangeable lens is attached to the imaging device and the interchangeable lens is in a contracted state. FIG. 1(c) shows that an interchangeable lens is attached to the imaging device and the interchangeable lens is in an extended state. In the following description, the direction in which the interchangeable lens attached to the imaging device faces is referred to as "front (front side)", and the opposite side is referred to as "rear (rear side)". Also, the vertical upper side of the imaging device is defined as "top", and the vertical lower side thereof is defined as "bottom". Also, the X direction, Y direction, and Z direction that are orthogonal to each other are set, the X direction being the width direction (horizontal direction) of the imaging device, the Y direction being the height direction (vertical direction) of the imaging device, and the Z direction. is the depth direction (front-rear direction) of the imaging device.

The imaging device 100 shown in FIG. 1 is for capturing an image. The imaging device 100 has a ring-shaped mount 101 provided in front thereof, and a mount ring 102 provided on the outer peripheral portion of the mount 101 . The interchangeable lens 10 is detachably attached to the mount 101 . Hereinafter, the state in which the interchangeable lens 10 is attached to the mount 101 is referred to as a "lens attached state". The mount ring 102 is rotatable around the optical axis O10 of the interchangeable lens 10 (imaging device 100). In this embodiment, in order to bring the lens into the mounted state, first, the mount ring 102 is rotated counterclockwise around the optical axis O10 as viewed from the front side. Then, the interchangeable lens 10 is inserted into the mount 101, and the mount ring 102 is rotated in the opposite direction. As a result, the claw portion (not shown) of the interchangeable lens 10 is pulled inward (toward the imaging element), and the lens is mounted. Note that the configuration in which the lens is attached is not limited to this, and may be, for example, a bayonet type or the like in which the interchangeable lens 10 is rotated around the optical axis O10 and fixed.

The imaging apparatus 100 also has a ring-shaped lens cover attachment portion 103 provided concentrically with the mount 101 on the outer peripheral side of the mount 101 . The lens cover 1 is detachably attached to the lens cover attachment portion 103 . Hereinafter, the state in which the lens cover 1 is attached to the lens cover attachment portion 103 is referred to as a "cover attached state." The lens cover 1 is a member that accommodates the interchangeable lens 10 in a lens-mounted state. Thereby, the interchangeable lens 10 can be protected with the cover attached. Note that the lens cover mounting portion 103 has a female thread 104 provided on its inner periphery. A male screw 45 of the lens cover 1 , which will be described later, is screwed into the female screw 104 .

The interchangeable lens 10 has a zoom ring 11 , a fixed barrel portion 12 and a movable barrel portion 13 . Also, the interchangeable lens 10 has at least one lens (not shown). The fixed barrel portion 12 is a cylindrical member that is inserted into and fixed to the mount ring 102 . A zoom ring 11 is supported on the outer peripheral portion of the fixed barrel portion 12 so as to be rotatable around the optical axis O10. A movable lens barrel portion 13 is supported on the inner peripheral portion of the fixed lens barrel portion 12 so as to be movable along the direction of the optical axis O10. By rotating the zoom ring 11, the movable lens barrel 13 and the lens can be driven back and forth along the optical axis O10. Zoom adjustment is thereby performed. In addition, the full length of the interchangeable lens 10 changes, that is, the interchangeable lens 10 expands and contracts due to the back and forth driving of the movable lens barrel portion 13 accompanying the rotating operation of the zoom ring 11 . A filter screw 14 formed of a female screw is provided at the front end portion of the inner peripheral portion of the movable lens barrel portion 13 . Various accessories can be attached to the filter screw 14 .

<Structure of lens cover>
FIG. 2 is a front perspective view of the state in which the lens cover is attached to the imaging device. Note that FIG. 2(a) shows the contracted state of the lens cover. FIG. 2(b) shows the extended state of the lens cover. FIG. 3A is an exploded perspective view of the essential parts of the lens cover when viewed from the front side. FIG. 3B is an exploded perspective view of the essential parts of the lens cover as seen from the rear side. FIG. 4 is a sectional view taken along the line AA in FIG. 2(a).

As shown in FIG. 2, the lens cover 1 is attached to the imaging device 100 for use. An interchangeable lens 10 is accommodated inside the lens cover 1 . In addition, the lens cover 1 can take the contracted state shown in FIG. 2(a) and the extended state shown in FIG. 2(b) while the interchangeable lens 10 is accommodated. As shown in FIGS. 3A and 3B, the lens cover 1 has a first cover 2, a second cover 3, and a conversion member (replacement member) 60, and is a cylindrical assembly in which these members are assembled. .

The first cover 2 has a first fixed tubular member 42, a rotary operation member (operating member) 40, and a second fixed tubular member 43 arranged in order from the imaging device 100 side. The first fixed cylinder member 42 and the second fixed cylinder member 43 are members each having a cylindrical shape (annular shape), and are fastened in the direction of the optical axis O10 by a plurality of fixing screws (bolts) 48 to provide an imaging device. A fixing member that is detachably fixed to 100 is configured. A male thread 45 is formed at the rear end portion of the outer peripheral portion of the first fixed cylindrical member 42 . The male thread 45 can be screwed with the female thread 104 of the lens cover mounting portion 103 . Thereby, the lens cover 1 is detachably fixed to the imaging device 100 .

Between the first fixed cylindrical member 42 and the second fixed cylindrical member 43, the rotary operation member 40 is fitted from the outer peripheral side thereof and arranged slidably. The rotary operation member 40 has a cylindrical (annular) shape and rotates in the direction of arrow α in FIG. Rotating operation is performed around the optical axis O10. As will be described later, this rotation operation changes the lens cover 1 between a contracted state and an expanded state. As shown in FIG. 4, the rotary operation member 40 includes an engaging portion (ring engaging portion) 44a that engages with the zoom ring 11 of the interchangeable lens 10, an engaging portion (ring engaging portion) 44b, an engaging portion ( ring engaging portion) 44c. The engaging portions 44a to 44c are arranged at equal angular intervals around the optical axis O10, that is, at equal intervals along the circumferential direction of the rotary operation member 40. As shown in FIG. The engaging portions 44a to 44c are configured by bolts that are screwed together from the inside of the rotary operation member 40. As shown in FIG. As a result, the engaging portions 44a to 44c protrude toward the optical axis O10. Further, by adjusting the amount of engagement of the engaging portions 44a to 44c, the amount of protrusion toward the optical axis O10, that is, the length of protrusion in the radial direction of the rotary operation member 40 can be varied. As a result, the engaging portions 44 a to 44 c can press against and engage with the outer peripheral surface of the zoom ring 11 regardless of the size of the outer diameter of the zoom ring 11 . When the rotary operation member 40 is rotated, the rotational force is transmitted to the zoom ring 11 . Thereby, the zoom ring 11 can be rotated. In this embodiment, the engagement between the engaging portions 44a to 44c and the zoom ring 11 is by pressure contact, but is not limited to this. It is possible to adopt various engagement structures such as engagement by meshing. Further, although there are a total of three engaging portions 44a to 44c in this embodiment, the number of arrangement is not limited to this. Further, the adjustment of the projection amounts of the engaging portions 44a to 44c is performed by the user's fingertips, for example.

As shown in FIGS. 3A and 3B, the second cover 3 includes a third fixed cylinder member (first cylinder member) 31, a movable cylinder member (second cylinder member) 32, and a movable cylinder member, which are arranged in order from the imaging device 100 side. It has a member 20 . The movable member 20 has an annular frame 22 and a transparent plate (transparent portion) 21 supported inside the frame 22 . The transparent plate 21 covers the interchangeable lens 10 from the front side, and has transparency through which visible light incident on the interchangeable lens 10 during imaging can pass. In addition, it is preferable that the transparent plate 21 is fixed to the frame 22 by adhesion. As a result, the transparent plate 21 is firmly fixed to the frame 22 and is sufficiently prevented from coming off from the frame 22 . As shown in FIG. 3B, the movable member 20 has a magnetic portion 23 provided on the back side of the frame 22 . The magnetic portion 23 is composed of an annular permanent magnet arranged concentrically with the frame 22 . The magnetic portion 23 functions as a support portion that supports the conversion member 60 so as to be rotatable about the optical axis O10 by the magnetic force of the permanent magnet. Note that the supporting structure is not limited to a supporting structure using magnetic force, and may be a supporting structure using fitting such as a lock structure or a snap-fit structure, for example.

The third fixed tubular member 31 and the movable tubular member 32 are members each having a cylindrical shape. The rear end of the third fixed tubular member 31 is connected to the front end of the second fixed tubular member 43 (fixed member). Further, the movable cylindrical member 32 is connected at its distal end to the rear end of the movable member 20 . Thus, the third fixed tubular member 31 and the movable tubular member 32 constitute a connecting member that connects the movable member 20 and the second fixed tubular member 43 . Also, the movable cylindrical member 32 is fitted inside the third fixed cylindrical member 31 and is slidable relative to the third fixed cylindrical member 31 in the direction of the optical axis O10. Due to this sliding, the connecting member composed of the third fixed cylindrical member 31 and the movable cylindrical member 32 can expand and contract in the direction of the optical axis O10. As a result, the total length of the lens cover 1 changes. In this embodiment, the expansion and contraction of the connecting member is based on relative movement of two members, but is not limited to this. For example, it may be based on relative movement of three or more members. It may be configured by a tubular body having a shape, and the tubular body may be expanded and contracted. As described above, the movable tubular member 32 is fitted inside the third fixed tubular member 31 . Therefore, the outer diameter (average outer diameter) of the third fixed cylindrical member 31 is larger than the outer diameter (average outer diameter) of the movable cylindrical member 32, and the lens cover 1 as a whole extends outward toward the rear end side. It has an increased diameter. This improves the operability when screwing the lens cover 1 onto the imaging device 100 and performing the mounting operation.

As shown in FIGS. 3A and 3B, the conversion member 60 is configured by an annular member. The conversion member 60 is a member (adapter member) that is exchanged according to the size of the interchangeable lens 10 . Therefore, in the lens cover 1 , a plurality of conversion members 60 are prepared according to the size of the lens diameter of the interchangeable lens 10 . These conversion members 60 have different inner diameters or different outer diameters. Accordingly, the interchangeable lens 10 corresponding to the size of the interchangeable lens 10 can be appropriately selected and used from among the plurality of conversion members 60 . Moreover, the converting member 60 has a ring-shaped protruding portion 63 centered on the optical axis O10 on its back surface. A male screw (lens engaging portion) 61 is formed on the outer peripheral portion of the projecting portion 63 . The male thread 61 is screwed with a female thread 141 formed at the front end of the inner periphery of the filter thread 14 (interchangeable lens 10) (see FIG. 8). This threaded engagement allows the conversion member 60 to engage the filter screw 14 . The constituent material of the conversion member 60 is, for example, martensitic or ferritic stainless steel. As a result, the contact surface 62, which is the surface on the front side, of the conversion member 60 is attracted to the magnetic portion 23 of the movable member 20, so that the conversion member 60 can rotate around the optical axis O10.

<Mounting (Attaching) Operation of Lens Cover to Imaging Device>
Next, the operation of mounting the lens cover 1 on the imaging device 100 will be described with reference to FIGS. 5A, 5B, 6, and 7. FIG. 5A and 5B are perspective views sequentially showing the process of attaching the lens cover. FIG. 5A(a) is a front perspective view showing the mounting process of the first cover. FIG. 5A(b) is a front perspective view showing the mounting process of the conversion member. FIG. 5B(c) is a front perspective view showing the mounting process of the second cover. FIG. 5B(d) is a rear perspective view showing the mounting process of the second cover. FIG. 6 is a cross-sectional view taken along the line BB in FIG. 2(a). FIG. 7 is a sectional view taken along line CC in FIG. 2(b).

To attach the lens cover 1 to the imaging device 100 , first, the lens cover 1 is disassembled into the first cover 2 , the second cover 3 and the conversion member 60 . A conversion member 60 that can be attached to the interchangeable lens 10 is selected from among the plurality of conversion members 60 . Then, as shown in FIG. 5A(a), the male screw 45 of the first fixed cylindrical member 42 of the first cover 2 is screwed into the female screw 104 of the lens cover mounting portion 103 of the imaging device 100. As shown in FIG. Thereby, the first cover 2 can be attached to the lens cover attachment portion 103 of the imaging device 100 . Also, during this mounting, the user operates the engaging portions 44a to 44c from the inside front of the first cover 2 to adjust the amount of projection of the engaging portions 44a to 44c. . As a result, the engaging portions 44a to 44c can be brought into pressure contact with the zoom ring 11, so that the rotary operation member 40 of the first cover 2 is engaged with the zoom ring 11 (see FIGS. 6 and 7).

Next, as shown in FIG. 5A(b), the male thread 61 of the conversion member 60 is screwed into the female thread 141 of the filter thread 14 of the interchangeable lens 10 . Thereby, the conversion member 60 can be attached to the interchangeable lens 10 (see FIGS. 6 and 7).

5B(c) and 5B(d), the external thread 34 of the third fixed cylindrical member 31 of the second cover 3 is screwed into the internal thread 41 of the second fixed cylindrical member 43 of the first cover 2. match. As a result, the second cover 3 can be connected to the first cover 2, and the cover is attached. Further, the lens cover 1 (second cover 3) can be expanded and contracted in the direction of the optical axis O10 by relative movement between the third fixed cylindrical member 31 and the movable cylindrical member 32. As shown in FIG. Accordingly, the lens cover 1 can cover the interchangeable lens 10 regardless of the total length of the interchangeable lens 10 . Further, when the first cover 2 and the second cover 3 are connected, the contact surface 62 of the conversion member 60 contacts the magnetic portion 23 of the second cover 3 and is attracted. As a result, the conversion member 60 can be rotated around the optical axis O10 with respect to the second cover 3. As shown in FIG.

As described above, by exchanging the conversion member 60 or adjusting the extension/contraction of the lens cover 1, the interchangeable lens 10 can be used regardless of the lens diameter and total length of the interchangeable lens 10. can be stored. Therefore, the lens cover 1 is compatible with interchangeable lenses 10 of various sizes that are attached to the imaging device 100 . Further, the expansion/contraction structure of the lens cover 1 is based on the relative rectilinear movement of the third fixed cylindrical member 31 and the movable cylindrical member 32 . As a result, the configuration of the lens cover 1 becomes simpler than when using a cam configuration having cam grooves and cam followers, for example. In addition, since the telescopic structure of the lens cover 1 does not use a cam mechanism, it is possible to deal with interchangeable lenses having various telescopic motions.

<Zooming the interchangeable lens with the cover attached>
Next, operation of the zoom ring 11 of the interchangeable lens 10 with the cover attached will be described with reference to FIGS. 6 and 7. FIG.

When zooming the lens cover 1, the user first rotates the rotary operation member 40 of the lens cover 1 in the direction of the arrow α in FIG. 2(a). As a result, the rotational force of the rotary operation member 40 is transmitted to the zoom ring 11 of the interchangeable lens 10 engaged with the rotary operation member 40 . By transmitting this rotational force, the zoom ring 11 can be rotated around the optical axis O10 together with the rotary operation member 40. As shown in FIG. Then, according to this rotation direction, the movable barrel portion 13 of the interchangeable lens 10 and the lens move back and forth along the optical axis O10 direction, so that zoom adjustment can be performed.

For example, when the state shown in FIG. 6 is changed to the state shown in FIG. A conversion member 60 is engaged with the filter screw 14 located in front of the movable barrel portion 13 . The conversion member 60 pushes the movable member 20 forward by the same amount as the length L when the movable lens barrel portion 13 moves forward by the length L. As shown in FIG. As a result, the movable cylindrical member 32 moves forward with respect to the third fixed cylindrical member 31, and the lens cover 1 is extended. It should be noted that the movable barrel portion 13 is accompanied by rotation about the optical axis O10 when moving forward by the length L (similarly when moving backward). As a result, the conversion member 60 also rotates around the optical axis O10 together with the movable barrel portion 13. As shown in FIG. As described above, the conversion member 60 is supported by the magnetic portion 23 of the movable member 20 so as to be rotatable around the optical axis O10. As a result, the conversion member 60 and the movable barrel section 13 are smoothly rotated.

Further, when the state shown in FIG. 7 is changed to the state shown in FIG. The conversion member 60 pulls the movable member 20 rearward by the same amount as the length L when the movable lens barrel portion 13 is retracted by the length L. This pulling is possible because the conversion member 60 and the movable member 20 are attracted by the magnetic portion 23 . Then, by moving the movable cylinder member 32 rearward with respect to the third fixed cylinder member 31, the lens cover 1 is contracted.

As described above, according to the lens cover 1, the zoom ring 11 of the interchangeable lens 10 can be easily and smoothly operated even when the cover is attached. Further, the lens cover 1 changes its overall length by the same amount as the extension of the interchangeable lens 10 . As a result, for example, the interchangeable lens 10 is prevented from being excessively retracted with respect to the lens cover 1, thereby avoiding part of the lens cover 1 from being included in the angle of view of the imaging device 100. . Further, even when the interchangeable lens 10 is in the maximum extension state, it is possible to prevent the front end portion of the interchangeable lens 10 and the transparent plate 21 of the lens cover 1 from interfering with each other. As a result, for example, both or one of the lens cover 1 and the interchangeable lens 10 can be prevented from being damaged.

<Waterproof function with lens cover>
Next, the waterproof function of the lens cover will be described with reference to FIGS. 8, 9, 10A and 10B. FIG. 8 is an enlarged view of a region [D] surrounded by a dashed line in FIG. FIG. 9 is an enlarged view of a region [E] surrounded by a dashed line in FIG. FIG. 10A is an exploded perspective view of a waterproof lens cover viewed from the front side. FIG. 10B is an exploded perspective view of the waterproof lens cover viewed from the rear side.

As shown in FIG. 8, the transparent plate 21 is fixed to the front side of the frame 22 of the movable member 20 with an adhesive 25 interposed therebetween. As a result, the space between the transparent plate 21 and the frame 22 is liquid-tightly sealed, so that it is possible to prevent liquid such as water (for example, rainwater) from entering from between them. A sealing member (sealing member) 24 is provided between the movable member 20 (frame body 22 ) and the movable cylindrical member 32 . As shown in FIGS. 10A and 10B, the sealing member 24 has an annular shape and is arranged concentrically with the movable member 20 . The sealing member 24 is made of an elastic material such as silicone rubber, and is compressed between the movable member 20 and the movable cylindrical member 32 . As a result, the space between the movable member 20 and the movable cylindrical member 32 is liquid-tightly sealed, so that liquid can be prevented from entering from between them. A sealing member (sealing member) 33 is provided between the inner peripheral portion of the third fixed tubular member 31 and the outer peripheral portion of the movable tubular member 32 . As shown in FIGS. 10A and 10B, the sealing member 33 has an annular shape and is arranged concentrically with the third fixed cylindrical member 31 and the movable cylindrical member 32 . Like the sealing member 24 , the sealing member 33 is made of, for example, an elastic material, and is compressed between the third fixed tubular member 31 and the movable tubular member 32 . As a result, the space between the third fixed cylindrical member 31 and the movable cylindrical member 32 is liquid-tightly sealed, so that liquid can be prevented from entering from therebetween. In addition, the sealing member 24 is fixed to the third fixed cylindrical member 31 . In this case, the movable cylindrical member 32 moves in the optical axis O10 direction while contacting the sealing member 33 . As the elastic material forming the sealing member 24, it is preferable to use a material capable of reducing friction with the movable cylindrical member 32. Examples thereof include nitrile rubber and silicone rubber.

As shown in FIG. 9, a sealing member (sealing member) 49 is provided between the second stationary tubular member 43 (fixing member) and the third stationary tubular member 31 (connecting member). As shown in FIGS. 10A and 10B, the sealing member 49 has an annular shape and is arranged concentrically with the second stationary tubular member 43 and the third stationary tubular member 31 . Like the sealing member 24 , the sealing member 49 is made of, for example, an elastic material, and is compressed between the second stationary tubular member 43 and the third stationary tubular member 31 . As a result, the space between the second fixed cylindrical member 43 and the third fixed cylindrical member 31 is liquid-tightly sealed, so that it is possible to prevent liquid from entering from therebetween.

A first sealing member (sealing member) 46 is provided between the first fixed tubular member 42 and the rotary operation member 40, and a first sealing member (sealing member) 46 is provided between the second fixed tubular member 43 and the rotary operation member 40. A second sealing member (sealing member) 47 is provided. As shown in FIGS. 10A and 10B, the first sealing member 46 and the second sealing member 47 are annular and arranged concentrically with the rotary operation member 40 . Like the sealing member 24, the first sealing member 46 and the second sealing member 47 are made of, for example, an elastic material. The first sealing member 46 is compressed between the first fixed tubular member 42 and the rotary operation member 40 . As a result, the space between the first fixed cylindrical member 42 and the rotary operation member 40 is liquid-tightly sealed, and therefore, it is possible to prevent liquid from entering from therebetween. Similarly, the second sealing member 47 is compressed between the second stationary tubular member 43 and the rotary operating member 40 . As a result, the space between the second fixed cylindrical member 43 and the rotary operation member 40 is liquid-tightly sealed, so that liquid can be prevented from entering from therebetween. As described above, the rotary operation member 40 rotates around the optical axis O10. In this case, the rotary operation member 40 rotates while contacting the first sealing member 46 and the second sealing member 47 . As the elastic material forming the first sealing member 46 and the second sealing member 47, it is preferable to use a material capable of reducing friction with the rotary operation member 40. , nitrile rubber and silicone rubber.

With such a configuration, the lens cover 1 can have a waterproof function. Thereby, the interchangeable lens 10 can be protected from rainwater and the like.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible within the scope of the gist thereof. For example, in the present embodiment, the adjustment of the amount of protrusion of the engaging portions 44a to 44c is configured to be performed from the inside of the rotary operation member 40, but is not limited to this. may be configured to be performed from the outside of the Further, in the present embodiment, the engagement between the rotary operation member 40 and the zoom ring 11 is performed using the engagement portions 44a to 44c configured by bolts, but the engagement is not limited to this. For example, a pair of clamping members that clamp the zoom ring 11 may be provided on the rotary operation member 40 to engage the rotary operation member 40 and the zoom ring 11 .

1 lens cover 10 interchangeable lens 11 zoom ring 20 movable member 31 third fixed cylindrical member (first cylindrical member)
32 movable cylinder member (second cylinder member)
40 rotation operation member 42 first fixed cylinder member 43 second fixed cylinder member 60 conversion member (replacement member)

Claims (11)

A lens cover that is attached to an imaging device that captures an image and that houses an interchangeable lens having a zoom ring that is rotated about the optical axis of the imaging device during zoom adjustment,
a fixing member detachably fixed to the imaging device;
an operating member having a ring engaging portion that engages with the zoom ring and that is rotated about the optical axis with respect to the fixed member;
a replacement member that has a lens engaging portion that engages with the front end portion of the interchangeable lens and is interchangeable according to the size of the interchangeable lens;
a movable member that covers the interchangeable lens from the front side and has a supporting portion that supports the interchangeable member so as to be rotatable around the optical axis;
A lens cover, comprising: a connecting member that connects the movable member and the fixed member and that can expand and contract in the optical axis direction. The connecting member has a first cylindrical member connected to the fixed member, and a second cylindrical member connected to the movable member and slidable in the optical axis direction with respect to the first cylindrical member. The lens cover according to claim 1, characterized by: 3. The lens cover according to claim 2, wherein the second cylindrical member slides inside the first cylindrical member. 4. The lens cover according to claim 2, wherein a sealing member is provided between the first cylindrical member and the second cylindrical member to seal the gap. 5. The lens engaging portion according to any one of claims 1 to 4, wherein the lens engaging portion is configured to be engageable with the front end portion of the interchangeable lens by screwing with the front end portion. lens cover. 6. The lens cover according to any one of claims 1 to 5, wherein the ring engaging portion projects toward the optical axis, and the amount of projection is variable. . 7. The lens cover according to claim 6, wherein said ring engaging portion is a bolt. 8. The lens cover according to any one of claims 1 to 7, wherein the supporting portion is configured to rotatably support the replacement member by magnetic force. 9. The lens cover according to any one of claims 1 to 8, wherein a plurality of said replacement members are prepared according to the lens diameter of said interchangeable lens. 9. The lens cover according to any one of claims 1 to 8, wherein the movable member has a transparent portion that covers the interchangeable lens from the front side. Between the fixed member and the operating member, between the movable member and the connecting member, and between the fixed member and the connecting member, sealing members for sealing the respective spaces are provided. 11. A lens cover as claimed in any one of claims 1 to 10, characterized in that a lens cover is provided.