Lens cover

Abstract

To provide a lens cover that is adaptable to interchangeable lenses of various sizes that are fitted to an imaging device, with which it is easy to rotate a zoom ring, and the structure of which is simple.SOLUTION: A lens cover 400 accommodates a lens barrel A200 having a zoom ring 203. The lens cover 400 comprises: a cylindrical stationary tube member 401 which is removably fixed to a camera body 100; a cylindrical movable tube member 410 which is disposed concentrically with the stationary tube member 401; a support unit 440 for restricting the rotation of the movable tube member 410 around an optical axis O100, with respect to the stationary tube member 401, and supporting the movable tube member 410 so as to be movable along the direction of the optical axis O100; and a conversion unit 450 which, when the movable tube member 410 moves along the direction of the optical axis O100, converts the motion in this movement direction to a rotational motion to rotate the zoom ring 203.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a lens cover. [Background technology]

[0002] Some imaging devices are used with various interchangeable lenses. When using an imaging device, a lens cover may be placed over the interchangeable lens. This protects the interchangeable lens from rainwater, even if the lens is not waterproof, when using the imaging device outdoors in bad weather. Furthermore, when operating the interchangeable lens to adjust the zoom, the zoom adjustment is difficult with the lens cover in place. Some interchangeable lenses change their overall length during zoom adjustment. Depending on the overall length of the interchangeable lens, there is a risk of interference between the interchangeable lens and the lens cover. Patent Document 1 therefore discloses a mechanism that enables zoom adjustment with the lens cover in place, and the lens cover expands and contracts in response to changes in the overall length of the interchangeable lens.

[0003] The lens cover (waterproof case) described in Patent Document 1 will be described with reference to FIG. 14. This FIG. 14 is an excerpt from FIG. 8 of Patent Document 1. As shown in FIG. 14, a lens barrel 2 whose overall optical length changes with zoom operation is attached to a camera body 1. The lens barrel 2 is housed in a waterproof case 3. The waterproof case 3 includes a movable barrel member 9, a fixed barrel member 31, a rotating barrel member 32, and a bellows member 45. The inner peripheral surface of the rotating barrel member 32 engages with the outer peripheral surface 26 of the zoom ring of the lens barrel 2. Rotating the rotating barrel member 32 also rotates the zoom ring, enabling zoom adjustment. A cam groove 95 is formed on the inner peripheral surface of the movable barrel member 9. This cam groove 95 converts the rotation of the rotating barrel member 32 into linear movement of the movable barrel member 9. The bellows member 45 can expand and contract in accordance with the linear movement of the movable barrel member 9. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-250418 Summary of the Invention [Problem to be solved by the invention]

[0005] The lens cover described in Patent Document 1 is configured so that the rotating barrel member 32 engages with the zoom ring of the lens barrel 2. For this reason, the lens cover described in Patent Document 1 cannot adequately accommodate lens barrels 2 with various outer diameters or zoom ring positions; in other words, it can only be used with a specific lens barrel 2, and lacks versatility. Furthermore, the lens cover described in Patent Document 1 is externally composed of four members: the movable barrel member 9, the fixed barrel member 31, the rotating barrel member 32, and the bellows member 45, which makes the configuration complex and the zoom adjustment operation cumbersome.

[0006] An object of the present invention is to provide a lens cover that is compatible with interchangeable lenses of various sizes that are attached to an imaging device, that allows easy rotation of the zoom ring, and that has a simple structure. [Means for solving the problem]

[0007] In order to achieve the above object, the lens cover of the present invention is a lens cover that is attached to an imaging device capable of capturing images and that houses an interchangeable lens having a zoom ring that is rotated around the optical axis of the imaging device when adjusting the zoom, and includes: a first cylindrical member that is detachably fixed to the imaging device; a second cylindrical member that is concentrically arranged with the first cylindrical member; a support unit that restricts rotation of the second cylindrical member around the optical axis relative to the first cylindrical member and supports the second cylindrical member movably along the optical axis direction; and a conversion unit that converts linear movement of the second cylindrical member when the second cylindrical member moves along the optical axis direction into rotational movement that rotates the zoom ring. the support portion has a first guide groove formed along the optical axis in one of the first cylindrical member and the second cylindrical member, and a first protrusion formed to protrude from the other cylindrical member and guided by the first guide groove, The conversion section is provided inside the second cylindrical member as a separate member from the second cylindrical member, and has an engaging member that engages with the zoom ring, a second guide groove formed in one of the second cylindrical member and the engaging member, and a second protruding portion that is formed to protrude from the other member and is guided by the second guide groove, and the second guide groove has an inclined groove formed at an angle with respect to the optical axis, an axial groove formed along the optical axis direction on a side closer to the imaging device than the inclined groove, and a circumferential groove formed along the circumferential direction of the one member between the inclined groove and the axial groove, and that communicates with the inclined groove and the axial groove. It is characterized by: [Effects of the Invention]

[0008] According to the present invention, it is possible to accommodate interchangeable lenses of various sizes that are attached to an imaging device, the zoom ring is easy to rotate, and the configuration is simple. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing a contracted state of the lens cover attached to the camera body. [Figure 2] FIG. 2 is a perspective view showing the lens cover attached to the camera body in an extended state. [Figure 3] FIG. 2 is an exploded perspective view of the camera body and the lens cover. [Figure 4] FIG. [Figure 5] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 6] FIG. 3 is a cross-sectional view taken along line BB in FIG. 2. [Figure 7] 10 is a planar development view showing a process in which the second protrusion moves relatively on the second guide groove. FIG. [Figure 8] FIG. 2 is a perspective view showing a state in which the lens cover is attached to the camera body. [Figure 9] 1A and 1B are longitudinal cross-sectional views showing the states of the lens covers at the zoom position when two types of lens barrels are attached to an imaging device. [Figure 10] 10 is a planar development view showing a process in which the second protrusion moves relatively on the second guide groove. FIG. [Figure 11] FIG. 2 is an exploded perspective view of the adjust ring as seen from the front. [Figure 12] FIG. 2 is an exploded perspective view of the adjust ring as seen from the rear. [Figure 13] FIG. 10 is a rear view showing the operating state of the engagement mechanism of the adjust ring. [Figure 14] FIG. 1 is a cross-sectional view illustrating a lens cover (waterproof case) described in Patent Document 1. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to Figures 1 to 13. However, the configurations described in the following embodiments are merely examples, and the scope of the present invention is not limited to the configurations described in the embodiments.

[0011] FIG. 1 is a perspective view showing a contracted state of the lens cover attached to the camera body. FIG. 2 is a perspective view showing an extended state of the lens cover attached to the camera body. FIG. 3 is an exploded perspective view of the camera body and lens cover. In the following description, the direction in which the lens barrel (interchangeable lens) attached to the camera body faces, i.e., the shooting direction, will be referred to as the "front (front side)," and the opposite side will be referred to as the "rear (rear side)." Furthermore, the vertically upper side of the camera body will be referred to as the "top," and the vertically lower side will be referred to as the "bottom."

[0012] The camera body 100 shown in FIGS. 1 to 3 is an imaging device capable of capturing images. The housing of the camera body 100 has a waterproof structure except for an opening. A well-known structure conventionally used for the housings of various electronic devices can be adopted as the waterproof structure. The camera body 100 has a ring-shaped lens mount 101 provided at the front thereof and a ring-shaped lens cover mount 102 provided on the outer periphery of the lens mount 101. A lens barrel (interchangeable lens) A200 is detachably attached to the lens mount 101. Hereinafter, the state in which the lens barrel A200 is attached to the lens mount 101 will be referred to as the "lens attached state." Note that the configuration for achieving the lens attached state is not particularly limited. For example, in this embodiment, the lens barrel A200 is fixed to the lens mount 101 by rotating it around the optical axis O100 of the camera body 100 (lens barrel A200).

[0013] The lens cover mount 102 is disposed concentrically with the lens mount 101. A lens cover 400 is detachably attached to this lens cover mount 102. Hereinafter, the state in which the lens cover 400 is attached to the lens cover mount 102 will be referred to as the "covered state." The lens cover 400 is a member that houses the lens barrel A200 in the lens-attached state. This allows the interchangeable lens to be protected in the covered state. Note that the configuration for achieving the covered state is not particularly limited, but in this embodiment, for example, the lens cover 400 is bayonet-type, in which it is rotated around the optical axis O100 and fixed to the lens cover mount 102.

[0014] As shown in FIG. 3, the lens barrel A200 has a fixed barrel portion 201, a movable barrel portion 202, and a zoom ring 203. At least one lens (not shown) is disposed in the lens barrel A200. The fixed barrel portion 201 is a cylindrical member that is detachably inserted into and fixed in the lens mount 101. The movable barrel portion 202 is fitted to the inner periphery of the fixed barrel portion 201. The movable barrel portion 202 is a cylindrical member that is slidable along the optical axis O100 relative to the fixed barrel portion 201. The zoom ring 203 is fitted to the outer periphery of the fixed barrel portion 201. The zoom ring 203 is an annular member that is rotatable around the optical axis O100 relative to the fixed barrel portion 201. By rotating the zoom ring 203, the movable barrel portion 202 and the lens can be driven back and forth along the optical axis O100. This allows zoom adjustment. The smallest zoom ratio is set when the movable barrel section 202 is at its most retracted position (W end). The largest zoom ratio is set when the movable barrel section 202 is at its most advanced position (T end). Note that the total length of the lens barrel A200 changes as the movable barrel section 202 moves back and forth in response to the rotation of the zoom ring 203, i.e., the lens barrel A200 expands and contracts. In addition, an adjust ring 300 engages with the zoom ring 203.

[0015] The adjust ring 300 has an overall annular shape and is an engaging member that engages with the zoom ring 203 on its inside. The zoom ring 203 of the lens barrel A200 and the zoom ring 253 of the lens barrel B250 (described later) differ from each other in terms of, for example, position and outer diameter. In other words, the zoom ring differs in position and outer diameter for each lens barrel. The adjust ring 300 can engage with the zoom ring regardless of the position and outer diameter of the zoom ring.

[0016] Fig. 4 is an exploded perspective view of the lens cover. Fig. 5 is a cross-sectional view taken along line AA in Fig. 2. Lens cover 400 is a cylindrical case body that can house lens barrel A200 attached to camera body 100 and adjust ring 300 that engages with zoom ring 203 of lens barrel A200. As shown in Figs. 4 and 5, lens cover 400 has a fixed cylindrical member (first cylindrical member) 401, a movable cylindrical member (second cylindrical member) 410, and a filter cover (front cover member) 430.

[0017] The fixed barrel member 401 is formed of a cylindrical (tubular) member, and has a lens cover side mount portion 402 at its rear end. As described above, in this embodiment, the cover is attached using a bayonet mechanism in which the lens cover 400 is fixed to the lens cover mount 102 by rotating it about the optical axis O100. Therefore, the lens cover side mount portion 402 is configured to be applicable to the bayonet mechanism. As a result, the fixed barrel member 401 (lens cover 400) is configured to be detachably fixed to the camera body 100 via the lens cover mount 102 by rotating the fixed barrel member 401 about the optical axis O100.

[0018] 5, an O-ring 408 serving as a first sealing member is provided concentrically between the lens cover side mount portion 402 of the fixed cylinder member 401 and the lens cover mount 102 of the camera body 100. The O-ring 408 is made of an elastic material such as silicone rubber, and is compressed in the direction of the optical axis O100 between the lens cover side mount portion 402 and the lens cover mount 102. This creates a liquid-tight seal between the lens cover side mount portion 402 and the lens cover mount 102, thereby preventing liquids such as rainwater from entering between them.

[0019] The movable barrel member 410 is made of a cylindrical (tubular) member, and is arranged inside the fixed barrel member 401 and concentrically with the fixed barrel member 401. The movable barrel member 410 is inserted into the front opening 403 of the fixed barrel member 401, and moves along the optical axis O100. When the movable barrel member 410 moves along the optical axis O100, it slides on the inner periphery of the fixed barrel member 401. This allows the movable barrel member 410 to move stably along the optical axis O100. The movement of the movable barrel member 410 changes the overall length of the lens cover 400, that is, the lens cover 400 expands and contracts.

[0020] As shown in FIGS. 4 and 5 , of the fixed barrel member 401 and the movable barrel member 410, at least one guide groove (first guide groove) 404 is formed along the optical axis O100 on the inner periphery of the fixed barrel member 401 (one). Furthermore, a cylindrical protrusion (first protrusion) 413 guided by the guide groove 404 is formed at the rear end of the outer periphery of the movable barrel member 410 (the other). In this embodiment, the number of guide grooves 404 is three. These three guide grooves 404 are arranged at equal intervals along the circumferential direction of the fixed barrel member 401. The number of guide grooves 404 is not limited to three and may be, for example, one, two, four, or more. A protrusion 413 is inserted into each guide groove 404 and can slide. Therefore, in this embodiment, the number of protrusions 413 is the same as the number of guide grooves 404, i.e., three. In the lens cover 400, the protrusions 413 slide relatively on the guide grooves 404 and are guided. This restricts the rotation of the movable barrel member 410 about the optical axis O100 with respect to the fixed barrel member 401, and allows the movable barrel member 410 to move stably along the optical axis O100. In this way, the guide grooves 404 and the protrusions 413 restrict the rotation of the movable barrel member 410 about the optical axis O100 with respect to the fixed barrel member 401, and also function as a support member 440 that supports the movable barrel member 410 so that the movable barrel member 410 can move along the optical axis O100. Note that in this embodiment, the guide grooves 404 are formed on the inner periphery of the fixed barrel member 401, and the protrusions 413 are formed on the outer periphery of the movable barrel member 410, but this is not limiting. For example, the guide grooves 404 may be formed on the outer periphery of the movable barrel member 410, and the protrusions 413 may be formed on the inner periphery of the fixed barrel member 401.

[0021] An O-ring 405 and a dust seal 406 serving as a second sealing member are provided concentrically with the inner circumferential portion of the fixed cylindrical member 401 and the outer circumferential portion of the movable cylindrical member 410. In this embodiment, the O-ring 405 is disposed rearward of the dust seal 406. The O-ring 405 and the dust seal 406 are compressed radially between the fixed cylindrical member 401 and the movable cylindrical member 410, i.e., in a direction perpendicular to the optical axis O100. This provides a liquid-tight seal between the fixed cylindrical member 401 and the movable cylindrical member 410, thereby preventing liquids such as rainwater from entering between them.

[0022] A filter cover 430 is provided on the front side of the movable barrel member 410. The filter cover 430 has a transparent filter (transparent portion) 420 having transparency, a seal member 421 as a third sealing portion, and an annular frame body 422. The transparent filter 420 is disk-shaped and supported and fixed inside the frame body 422. The frame body 422 has a female thread portion (not shown) that screws into a male thread portion 412 formed on the front end of the outer periphery of the movable barrel member 410. This screw engagement fixes the frame body 422 (filter cover 430) to the opening 411 of the movable barrel member 410. At this time, the transparent filter 420 covers the lens barrel A200 from the front side. This allows visible light incident on the lens barrel A200 to pass through the transparent filter 420 during image capture. The seal member 421 is provided between the frame body 422 and the movable barrel member 410. Seal member 421 is a cushion member having a fine cell structure, and is compressed in the direction of optical axis O100 between frame body 422 and movable cylindrical member 410. This provides a liquid-tight seal between frame body 422 and movable cylindrical member 410, thereby preventing liquid from seeping in between them. Note that, although a cushion member is used as seal member 421 in this embodiment, the present invention is not limited to this, and for example, a sealing member such as an O-ring may also be used.

[0023] As described above, in the lens cover 400, the O-ring 408 serving as the first sealing portion provides waterproofing between the fixed barrel member 401 and the camera body 100. The O-ring 405 and the dust seal 406 serving as the second sealing portion provide waterproofing between the fixed barrel member 401 and the movable barrel member 410. The seal member 421 serving as the third sealing portion provides waterproofing between the filter cover 430 and the movable barrel member 410. Even if the lens barrel A200 does not have a waterproof structure, this waterproofing can protect the lens barrel A200 from liquids such as rainwater. While the lens cover 400 is waterproofed by the first to third sealing portions in this embodiment, the present invention is not limited to this, and the first to third sealing portions may be omitted.

[0024] Fig. 6 is a cross-sectional view taken along line BB in Fig. 2. The cross-section taken along line BB in Fig. 6 is a plane connecting the optical axis and the center of the circle of protrusion 311 of adjust ring 300. Fig. 7 is a developed plan view showing the process of the second protrusion moving relatively on the second guide groove. Fig. 8 is a perspective view showing the state in which the lens cover is attached to the camera body.

[0025] As shown in FIG. 6 , an adjust ring 300 configured as a separate member from the movable cylindrical member 410 is provided inside the movable cylindrical member 410. Of the movable cylindrical member 410 and the adjust ring 300, a guide groove (second guide groove) 414 is formed on the inner periphery of the movable cylindrical member 410 (one of the movable cylindrical members). Furthermore, a protrusion (second protrusion) 311 guided by the guide groove 414 is formed in a cylindrical shape on the outer periphery of the adjust ring 300 (the other member). In this embodiment, the number of guide grooves 414 is three. These three guide grooves 414 are arranged at equal intervals along the circumferential direction of the movable cylindrical member 410. Note that the number of guide grooves 414 is not limited to three and may be, for example, one, two, four or more. Furthermore, a protrusion 311 is inserted into each guide groove 414 and can slide. Therefore, in this embodiment, the number of protrusions 311 is the same as the number of guide grooves 414, i.e., three. In this embodiment, the guide groove 414 is formed on the inner periphery of the movable tubular member 410, and the protrusion 311 is formed on the outer periphery of the adjust ring 300, but this is not limiting. For example, the guide groove 414 may be formed on the outer periphery of the adjust ring 300, and the protrusion 311 may be formed on the inner periphery of the movable tubular member 410.

[0026] As shown in FIG. 7, the guide groove 414 has a first guide groove (axial groove) 414a, a second guide groove (circumferential groove) 414b, and a third guide groove (inclined groove) 414c. The first guide groove 414a is a vertical groove formed along the optical axis O100 and opening at the rear end surface 416 of the movable cylindrical member 410. The second guide groove 414b is a horizontal groove formed along the circumferential direction of the movable cylindrical member 410. The third guide groove 414c is an inclined groove formed at an angle with respect to the optical axis O100. The first guide groove 414a is disposed rearward of the third guide groove 414c. The second guide groove 414b is disposed between the third guide groove 414c and the first guide groove 414a. The third guide groove 414c and the first guide groove 414a communicate with each other via the second guide groove 414b.

[0027] Here, the process up to attaching the lens cover 400 will be described. When attaching the lens cover 400, first, as shown in FIG. 8, the lens barrel A200 is attached to the camera body 100 to set the lens attached state. Next, the adjust ring 300 is inserted into the lens barrel A200, and the adjust ring 300 and the zoom ring 203 of the lens barrel A200 are engaged. This results in the adjust ring 300 being attached to the zoom ring 203. Then, the adjust ring 300 is rotated together with the zoom ring 203 to set the zoom position of the lens barrel A200 to the T-end position, where the movable barrel section 202 is at its most forward position. The lens cover 400 is also in its most extended state.

[0028] Next, the lens cover 400 is inserted into the lens barrel A200 and the adjust ring 300. During this insertion process, the protrusion 311 of the adjust ring 300 is located at position 311a, just before it is inserted from the rear into the first guide groove 414a of the lens cover 400 (movable barrel member 410). When the lens cover 400 is further pushed rearward, the lens cover 400 abuts against the lens cover mount 102 of the camera body 100. During this process of pushing the lens cover 400, the protrusion 311 slides along the first guide groove 414a and stops at position 311b. Position 311b is the intersection of the first guide groove 414a and the second guide groove 414b.

[0029] Next, fixed barrel member 401 of lens cover 400 is rotated clockwise when viewed from the front, and lens cover side mount portion 402 of fixed barrel member 401 is fixed to lens cover mount 102 of camera body 100. As described above, this fixation is achieved by a bayonet. This results in a cover-attached state in which lens cover 400 is attached to camera body 100. This cover-attached state is the state shown in FIG. 2. Furthermore, during the rotation of fixed barrel member 401, protrusion 311 slides along second guide groove 414b and moves from position 311b to position 311c. Position 311c is the intersection of second guide groove 414b and third guide groove 414c.

[0030] When the movable barrel member 410 is moved rearward from the state shown in FIG. 2, the protrusion 311 slides along the third guide groove 414c and moves from position 311c to position 311d. As a result, the linear movement of the movable barrel member 410 along the optical axis O100 is converted into rotational movement that rotates the adjust ring 300 and the zoom ring 203 due to the inclined shape of the third guide groove 414c. As a result, the adjust ring 300 rotates counterclockwise (in the direction of arrow A in FIG. 7) around the optical axis O100 when viewed from the front, together with the zoom ring 203. This allows the zoom position of the lens barrel A200 to be changed to the W end position, where the movable barrel portion 202 is most retracted. Furthermore, when the protrusion 311 moves to position 311d, the movement of the movable barrel member 410 ends, and the lens cover 400 returns to the state shown in FIG. 1.

[0031] Furthermore, the amount of movement A1 by which the protrusion 311 moves in the circumferential direction from position 311c in the third guide groove 414c to position 311d, i.e., the length of the third guide groove 414c along the circumferential direction of the movable barrel member 410, is the same as the maximum amount of rotation of the zoom ring 203. As a result, when the rotation of the zoom ring 203 ends, the zoom position becomes the W end position. The distance L1 by which the protrusion 311 moves in the direction of the optical axis O100 from position 311c in the third guide groove 414c to position 311d (the length of the third guide groove 414c along the optical axis O100) is equal to or less than the maximum amount of movement of the movable barrel portion 202 of the lens barrel A200. As a result, when the movable barrel portion 202 is at the most retracted position, the filter cover 430 (transparent filter 420) of the lens cover 400 is prevented from colliding with the tip of the lens barrel A200. Here, when the movable barrel member 410 is moved forward from the state shown in FIG. 1, the protrusion 311 slides in the third guide groove 414c as the movable barrel member 410 moves forward. As a result, the adjust ring 300 rotates clockwise (in the direction of arrow B in FIG. 7) around the optical axis O100 when viewed from the front. Furthermore, as the adjust ring 300 rotates, the zoom ring 203 of the lens barrel A200 also rotates, and the zoom position of the lens barrel A200 transitions from the W-end position toward the T-end position. In this way, by placing a finger on the movable barrel member 410 and pushing or pulling the movable barrel member 410 in the direction of the optical axis O100, the adjust ring 300 rotates together with the zoom ring 203, allowing zoom adjustment of the lens barrel A200. Furthermore, the length of the second guide groove 414b along the circumferential direction is the same as the amount of rotation of the fixed barrel member 401 when the fixed barrel member 401 is fixed to the camera body 100. This allows the fixed cylinder member 401 to be fixed to the camera body 100 by tightening it just enough, and when this fixing is complete, the protrusion 311 can be accurately positioned at position 311c of the second guide groove 414b.

[0032] When removing lens cover 400 from camera body 1, first, movable barrel member 410 is moved forward, in the opposite direction to the above. As this movement occurs, protrusion 311 slides along third guide groove 414c and moves from position 311d to position 311c. At this time, the zoom position of lens barrel A200 becomes the T-end position, where movable barrel section 202 is at its most advanced position.

[0033] Next, fixed barrel member 401 of lens cover 400 is rotated counterclockwise when viewed from the front, thereby releasing the fixation between lens cover side mount portion 402 of fixed barrel member 401 and lens cover mount 102 of camera body 100. Furthermore, during the rotation of fixed barrel member 401, protrusion 311 slides along second guide groove 414b and moves from position 311c to position 311b. Then, by moving lens cover 400 forward in this state, lens cover 400 can be separated from camera body 100. This completes the removal of lens cover 400 from camera body 1. Furthermore, during the movement of lens cover 400, protrusion 311 slides along first guide groove 414a and moves from position 311b to position 311a.

[0034] As described above, when the movable barrel member 410 moves along the optical axis O100, the guide groove 414 and the protrusion 311 function as a conversion unit 450 that converts the movement in that direction into rotational movement that rotates the zoom ring 203. This allows the zoom ring 203 to be easily rotated with a simple configuration in which the movable barrel member 410 is moved along the optical axis O100. Furthermore, in the lens cover 400, the adjust ring 300 that rotates the zoom ring 203 is disposed inside the movable lens barrel portion 202 and is not exposed to the outside. This makes it possible to omit the configuration for providing waterproofing to the adjust ring 300, thereby simplifying the configuration of the lens cover 400 and enabling the lens cover 400 to be made more compact (with a smaller diameter).

[0035] As shown in FIG. 8, a zoom index 415 indicating the degree of zoom adjustment is provided on the upper outer periphery of the movable barrel member 410. The zoom index 415 is composed of multiple markers such as lines so that the user can grasp the W-end position, T-end position, and each zoom magnification position. The method of providing the zoom index 415 is not particularly limited, and methods such as engraving, printing, and pasting can be used. The zoom index 415 may also include a numerical value indicating the zoom magnification. For example, in the case of a 70 mm to 300 mm zoom lens, a numerical value ranging from 70 to 300 may be provided along with the marker to indicate the zoom magnification. An indicator convex portion 407 is formed on the upper portion of the front opening 403 of the fixed barrel member 401. The indicator convex portion 407 is adjacent to one of the zoom indexes 415 (markers) depending on the position of the movable barrel member 410. For example, as shown in FIG. 8, at the T-end position, the indicator convex portion 407 is adjacent to the zoom index 415 indicating the T-end position. This allows the user to understand the degree of zoom adjustment in the lens cover 400.

[0036] Next, a case where lens barrels with different overall optical lengths and zoom magnifications are attached to the camera body 100 will be described with reference to FIGS. 9 and 10. The lens barrels attached to the camera body 100 are the aforementioned lens barrel A200 and lens barrel B250, which has a different zoom magnification and overall optical length than lens barrel A200. Lens barrel B250 also has a zoom ring 253. The position of this zoom ring 253 along the optical axis O100 is also different from the position of the zoom ring 203 of lens barrel A200 along the optical axis O100. FIG. 9 is a vertical cross-sectional view showing the state of the lens covers at the zoom positions when two types of lens barrels are attached to an imaging device. FIG. 9(a) shows the state of the lens cover 400 at the T-end position when lens barrel A200 is attached to the camera body 100. FIG. 9(b) shows the state of the lens cover 400 when the zoom position transitions from the state shown in FIG. 9(a) to the W-end position. Fig. 9(c) shows the state of lens cover 400 at the T-end position when lens barrel B250 is attached to camera body 100. Fig. 9(d) shows the state of lens cover 400 when the zoom position has transitioned from the state shown in Fig. 9(c) to the W-end position. Fig. 10 is a planar development showing the process of the second protrusion moving relatively along the second guide groove. Fig. 10 is a diagram of the lens barrel B250 attached to camera body 100.

[0037] As described above, the zoom ring 203 of the lens barrel A200 and the zoom ring 253 of the lens barrel B250 are positioned at different positions along the optical axis O100. Comparing the state shown in FIG. 9(a) with the state shown in FIG. 9(c), the adjust ring 300 in the state shown in FIG. 9(c) is positioned a distance L3 further back than the adjust ring 300 in the state shown in FIG. 9(a). In this positional relationship, when the lens cover 400 is attached to the camera body 100 to which the lens barrel B250 is attached, the protrusion 311 of the adjust ring 300 slides in the first guide groove 414a of the movable barrel member 410. At this time, as shown in FIG. 10, the protrusion 311 moves from position 311a to position 311e. When the movable barrel member 410 is further moved rearward by the distance L3, the protrusion 311 moves from position 311e to position 311b in the first guide groove 414a. In this state, lens cover 400 can be rotated around optical axis O100 to fix fixed cylinder member 401 of lens cover 400 to lens cover mount 102 of camera body 100. During the rotation of lens cover 400, protrusion 311 slides along second guide groove 414b and moves from position 311b to position 311c. This completes attachment of lens cover 400 to camera body 100, resulting in the state shown in FIG. 9(c).

[0038] When the movable barrel member 410 is moved rearward from the state shown in FIG. 9(c), the protrusion 311 slides along the third guide groove 414c and moves from position 311c to position 311d. At this time, the zoom position of the lens barrel B250 becomes the W end position, and the lens cover 400 becomes the state shown in FIG. 9(d). The movable barrel member 410 also moves a distance L1, i.e., the length of the third guide groove 414c along the optical axis O100 (see FIGS. 9(c) and 9(d)). Here, the distance that the protrusion 413 of the movable barrel member 410 can move along the guide groove 404 of the fixed barrel member 401, i.e., the length of the guide groove 404 along the optical axis O100, is defined as "L2." This distance L2 is longer than the distance L1. Specifically, the relationship of distance L2 ≥ distance L1 + distance L3 is satisfied. This prevents the movement of the movable barrel member 410 from stopping before the protrusion 311 moves to position 301d. Furthermore, the distance L1 is equal to or smaller than the amount of movement of the movable barrel portion 252 of the lens barrel B250. This prevents the filter cover 430 (transparent filter 420) of the lens cover 400 from colliding with the tip of the lens barrel B250 when the movable barrel portion 252 is at its most retracted position. Furthermore, as mentioned above, the lens barrel A200 and the lens barrel B250 have different overall optical lengths. Therefore, when comparing the distance from the tip of the lens barrel A200 to the transparent filter 420 (see FIGS. 9(a) and 9(b)) with the distance from the tip of the lens barrel B250 to the transparent filter 420 (see FIGS. 9(c) and 9(d)), the latter distance is longer than the former distance. As a result, lens barrel B250 is retracted (set back) further back than lens barrel A200, which may block light entering lens barrel B250. However, because the diameter of movable barrel member 410 is ensured to be sufficiently large, light entering lens barrel B250 is prevented from being blocked. This makes it possible to prevent, for example, vignetting from occurring in captured images.

[0039] As shown in FIG. 9(b), when the lens cover 400 is used with the lens barrel A200 having a long overall optical length, there is clearance (room) between the protrusion 413 of the movable barrel member 410 and the rear end of the guide groove 404 of the fixed barrel member 401 when the zoom position is at the W end. On the other hand, as shown in FIG. 9(c), when the lens cover 400 is used with the lens barrel B250 having a short overall optical length, there is clearance (room) between the protrusion 413 of the movable barrel member 410 and the front end of the guide groove 404 of the fixed barrel member 401 when the zoom position is at the T end. Therefore, the distance L2 of the guide groove 404 of the fixed barrel member 401 is set longer than the distance L1 that the movable barrel member 410 moves during zoom adjustment. This makes it possible for a single lens cover 400 to be compatible with (usable with) various lens barrels A200 and B250 attached to the camera body 100.

[0040] Next, the engagement mechanism (lens ring gripping mechanism) of the adjust ring 300 will be described with reference to FIGS. 11 to 13. FIG. 11 is an exploded perspective view of the adjust ring as seen from the front. FIG. 12 is an exploded perspective view of the adjust ring as seen from the rear. FIG. 13 is a rear view showing the operating state of the adjust ring engagement mechanism. FIG. 13(a) shows a state in which the adjust ring 300 has not yet engaged with the zoom ring. FIG. 13(b) shows a state in which the adjust ring 300 has engaged with the zoom ring 203 of the lens barrel A200. FIG. 13(c) shows a state in which the adjust ring 300 has engaged with the zoom ring 253 of the lens barrel B250. FIG. 13(d) shows a state in which the adjust ring 300 has engaged with the minimum applicable zoom ring 260. Note that the ring cover 340 has been omitted from FIG. 13 to facilitate understanding of the engagement mechanism. As shown in FIGS. 11 and 12, the adjustable ring 300 includes 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 , and a screw 370 .

[0041] The ring base 310 is a hollow, annular body that houses the right arm 320, the left arm 330, the operation unit 350, and the arm sliding shaft 360. The ring base 310 has three protrusions 311 that protrude from its outer periphery and are evenly spaced along the circumferential direction. A recess 312 is formed between two of the three protrusions 311 (in this embodiment, at the top of the outer periphery) on the outer periphery of the ring base 310. A hole 313 is formed at the bottom of the recess 312, through which the operation knob 351 of the operation unit 350 is exposed. A sliding rib 314, along which the right arm 320 and the left arm 330 slide, and an abutting rib 318, against which the right arm 320 and the left arm 330 abut, are formed protruding from the hollow portion of the ring base 310. Also formed are protruding support parts 315 that support right arm 320, left arm 330, and operation unit 350, shaft support part 316 that supports arm sliding shaft 360, and boss part 317 that screws into screw 370. The hollow part of ring base 310 is closed with ring cover 340 when right arm 320, left arm 330, operation unit 350, and arm sliding shaft 360 are stored therein.

[0042] The ring cover 340 is a plate member having an annular shape. A recess 341 is formed on the outer periphery of the ring cover 340. When the ring base 310 is covered with the ring cover 340, the recess 312 of the ring base 310 is aligned with the recess 341 of the ring cover 340. The ring cover 340 also has through holes 346 through which the threaded portions of the screws 370 are inserted. The screws 370 inserted through the through holes 346 are threadedly engaged with the boss portions 317 of the ring cover 340, thereby fixing the ring base 310 to the ring cover 340. A sliding rib 342, along which the right arm 320 and the left arm 330 slide, is formed protruding from the front surface of the ring cover 340. In addition, anti-slip ribs 343 and 344 that prevent the operation unit 350 from coming off the support portion 315, and anti-slip rib 345 that prevents the arm sliding shaft 360 from coming off the shaft support portion 316 are formed protruding from the front surface of the ring cover 340.

[0043] The operation unit 350 is an adjustment operation section (adjustment section) that adjusts the distance between the right arm 320 and the left arm 330 in accordance with the outer diameter of the zoom ring 203. As shown in FIGS. 11 and 12 , the operation unit 350 has an operation knob 351, a transmission section 352, a right worm section 353, and a left worm section 354. The operation knob 351 is annular and rotates around an axis parallel to a direction perpendicular to the optical axis O100 of the adjust ring 300. Depending on the direction of rotation, the right arm 320 and the left arm 330 move toward or away from each other. The right worm section 353 and the left worm section 354 are disposed on opposite sides of the operation knob 351. The right worm section 353 has a right-hand twist worm, and the left worm section 354 has a left-hand twist worm. The transmission units 352 are disposed between the operation knob 351 and the right worm unit 353, and between the operation knob 351 and the left worm unit 354. One transmission unit 352 transmits the rotational force of the operation knob 351 to the right worm unit 353, and the other transmission unit 352 transmits the rotational force of the operation knob 351 to the left worm unit 354.

[0044] A portion of the operation knob 351 protrudes from the hole 313. This allows the operation knob 351 to be rotated. The amount of protrusion of the operation knob 351 from the hole 313 is such that the operation knob 351 does not protrude beyond the maximum outer diameter of the ring base 310. In other words, the portion of the operation knob 351 protruding from the hole 313 does not extend beyond the maximum outer diameter of the ring base 310. This makes it difficult to touch the operation knob 351 when rotating the adjust ring 300, thereby preventing accidental operation of the operation knob 351. A hole 351a having a key groove is formed on one side of the operation knob 351, and a hole 351b having a key groove is formed on the other side of the operation knob 351. A protrusion 352a having a key, which is formed on one transmission part 352, is inserted into the hole 351a. A protrusion 352a having a key, which is formed on the other transmission part 352, is inserted into the hole 351b. 12, the ring base 310 has a hole 313a that penetrates from left to right. After placing the operation knob 351 in the hole 313, the transmission parts 352 can be inserted into the left and right sides of the hole 313a. Then, the protrusions 352a of the transmission parts 352 can be fitted into the holes 351a and 351b, respectively. This allows the operation knob 351 and the transmission parts 352 to be connected to each other.

[0045] A groove 352b that opens rearward is formed on the opposite side of the protrusion 352a of each transmission part 352. The shaft 353a of the right worm part 353 can be inserted from the rear into the groove 352b of one transmission part 352, thereby connecting one transmission part 352 and the right worm part 353. The shaft 354a of the left worm part 354 can be inserted from the rear into the groove 352b of the other transmission part 352, thereby connecting the other transmission part 352 and the left worm part 354. The shaft 353b is formed on the end of the right worm part 353 opposite the shaft 353a. Furthermore, the shaft 354b is formed on the end of the left worm part 354 opposite the shaft 354a. The shafts 353b and 354b are inserted into the support portions 315 of the ring base 310 from the rear and fitted with the support portions 315. This allows the right worm portion 353 and the left worm portion 354 to rotate as the operation knob 351 is rotated.

[0046] The right arm 320 and the left arm 330 are a pair of clamping pieces (clamping portions) that clamp the zoom ring 203 in a direction perpendicular to the optical axis O100. The right arm 320 and the left arm 330 can move toward or away from each other in a direction perpendicular to the optical axis O100. The distance between the right arm 320 and the left arm 330 can be adjusted by rotating an operation knob 351 of an operation unit 350. This allows the distance between the right arm 320 and the left arm 330 to be adjusted according to the outer diameter of the zoom ring 203, and the zoom ring 203 to be clamped between the right arm 320 and the left arm 330. Note that in this embodiment, the operation unit 350 adjusts the positions of the right arm 320 and the left arm 330 using a worm, but is not limited to this. For example, the positions of the right arm 320 and the left arm 330 may be adjusted using a spring.

[0047] The right arm 320 and the left arm 330 are each curved in an arch shape in the circumferential direction of the ring base 310. Helical teeth 321 that mesh with the right worm portion 353 are formed at the end of the right arm 320 on the operation unit 350 side. A slide hole 322 through which the arm slide shaft 360 passes is formed at the end of the right arm 320 opposite the helical teeth 321. Helical teeth 331 that mesh with the left worm portion 354 are formed at the end of the left arm 330 on the operation unit 350 side. A slide hole 332 through which the arm slide shaft 360 passes is formed at the end of the left arm 330 opposite the helical teeth 331.

[0048] A contact portion 323 is provided at the longitudinal center of the right arm 320, facing the optical axis O100, and having a flat surface substantially parallel to the optical axis O100. A contact portion 333 is provided at the longitudinal center of the left arm 330, facing the optical axis O100, and having a flat surface substantially parallel to the optical axis O100. The contact portions 323 and 333 are brought into contact with the outer periphery of the zoom ring 203 when the zoom ring 203 is sandwiched between the right arm 320 and the left arm 330. The contact portions 323 and 333 are, for example, plate or sheet materials made of an elastic material such as rubber. This makes it possible to easily generate frictional force between the contact portions 323 and 333 and the zoom ring 203 when the adjust ring 300 rotates the zoom ring 203. This frictional force ensures sufficient engagement between the adjust ring 300 and the zoom ring 203, preventing the zoom ring 203 from spinning freely. Furthermore, because the abutment portions 323 and 333 are made of an elastic member, the abutment area (contact area) between the abutment portions 323 and 333 and the zoom ring 203 can be ensured to be as large as possible, regardless of the outer diameter of the zoom ring 203. This contributes to the engagement between the adjust ring 300 and the zoom ring 203. Furthermore, the surface on which the abutment portion 323 is mounted on the right arm 320 and the surface on which the abutment portion 333 is mounted on the left arm 330 are both flat. This allows the abutment portion 323 to be stably mounted on the right arm 320, and the abutment portion 333 to be stably mounted on the left arm 330. In this embodiment, the surfaces of the abutment portions 323 and 333 facing the optical axis O100 are flat, but this is not limited thereto and may be curved surfaces. Furthermore, the contact portions 323 and 333 may have their flat surfaces facing the optical axis O100 roughened, which contributes to stronger engagement between the adjust ring 300 and the zoom ring 203.

[0049] Further, the right arm 320 has a first sliding groove 324 formed on its front surface for sliding on the sliding rib 314 of the ring base 310, and a second sliding groove 325 formed on its rear surface for sliding on the sliding rib 342 of the ring cover 340. The left arm 330 has a first sliding groove 334 formed on its front surface for sliding on the sliding rib 314 of the ring base 310, and a second sliding groove 335 formed on its rear surface for sliding on the sliding rib 342 of the ring cover 340. This allows the right arm 320 and the left arm 330 to approach and separate stably.

[0050] In the state shown in FIG. 13(a), the right arm 320 is located to the left of the right worm portion 353, and the left arm 330 is located to the right of the left worm portion 354. The right arm 320 abuts against the shaft support portion 316 on the center side of the figure, and the left arm 330 abuts against the shaft support portion 316 on the right side of the figure. At this time, the right arm 320 and the left arm 330 are at their most distant from each other. When the operation knob 351 is rotated backward (toward the viewer in the figure) from the state shown in FIG. 13(a), the right worm portion 353 and the left worm portion 354 each rotate. As a result, the right arm 320 and the left arm 330 move toward the optical axis O100. Furthermore, even if an attempt is made to rotate the operating knob 351 forward (toward the back in the figure) from the state shown in Figure 13(a), further rotation is restricted because the right arm 320 and the left arm 330 are in contact with the shaft support portion 316 as described above.

[0051] Then, with the zoom ring 203 of the lens barrel A200 disposed between the right arm 320 and the left arm 330, the operation knob 351 is rotated backward. As a result, the abutment portion 323 of the right arm 320 and the abutment portion 333 of the left arm 330 come into contact with the outer periphery of the zoom ring 203, resulting in the state shown in FIG. 13(b). If an attempt is made to rotate the operation knob 351 backward further, the right arm 320 will tilt toward the left arm 330, with the abutment portion 323 as a fulcrum, and the left arm 330 will tilt toward the right arm 320, with the abutment portion 333 as a fulcrum. In this case, there is a risk that an excessive clamping force (load) will act on the zoom ring 203; however, the lower ends of the right arm 320 and the left arm 330 slide on the arm sliding shaft 360, thereby reducing the effect of the excessive clamping force. In this embodiment, the right arm 320 and the left arm 330 are configured so that their lower ends are supported slidably, but this is not limited to this, and their lower ends may be fixed ends or free ends.

[0052] Generally, worm gear mechanisms in which a worm meshes with helical teeth are known to have a self-locking mechanism. Therefore, it is difficult to rotate the worm from the helical teeth side. As a result, in the adjust ring 300, the right arm 320 and the left arm 330 can only be rotated by rotating the operation knob 351. This allows the adjust ring 300 to adequately maintain the clamped (engaged) state of the zoom ring 203 without providing a new locking mechanism. In this clamped state, the zoom ring 203 can be stably rotated by rotating the adjust ring 300 around the optical axis O100. The clamped state can be released by rotating the operation knob 351 forward (toward the rear in the figure) from the state shown in FIG. 13(b) to separate the right arm 320 and the left arm 330 from each other.

[0053] Similarly, when clamping the zoom ring 253 of the lens barrel B250, the operation knob 351 is rotated backward with the zoom ring 253 disposed between the right arm 320 and the left arm 330. As a result, as shown in FIG. 13(c), the abutment portion 323 of the right arm 320 and the abutment portion 333 of the left arm 330 come into contact with the outer periphery of the zoom ring 253. This allows the zoom ring 253 to be clamped.

[0054] 13(d), the right arm 320 and the left arm 330 can approach each other until the helical teeth 321 of the right arm 320 are positioned at the rightmost position of the right worm portion 353 in the figure, and the helical teeth 331 of the left arm 330 are positioned at the leftmost position of the left worm portion 354 in the figure. At this time, the lower ends of the right arm 320 and the left arm 330 abut against the abutment rib 318 of the ring base 310, restricting further rotation of the operation knob 351. As shown in FIG. 13(d), the zoom ring 260 is the smallest that can be clamped by the adjust ring 300.

[0055] In this way, even when the lens cover 400 is used with lens barrels having zoom rings with different outer diameters, the zoom ring can be easily and sufficiently clamped by the adjust ring 300. This allows zooming operations to be performed. Note that in this embodiment, the right arm 320 and the left arm 330 are configured to be able to move toward and away from each other using a worm gear mechanism, but this is not limited thereto. For example, they may be configured to be able to move toward and away from each other using a coil spring. Also, in this embodiment, the adjust ring is configured to clamp the zoom ring between the right arm 320 and the left arm 330, but this is not limited thereto. For example, the adjust ring may have multiple bolts protruding inward, and the zoom ring may be engaged by adjusting the amount of protrusion of each bolt.

[0056] While the 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 variations are possible within the spirit and scope of the present invention. In this embodiment, the adjust ring 300 is configured to engage with the zoom ring 203, but this is not limiting. For example, an annular rubber ring with a protrusion may be fitted onto the zoom ring of the lens barrel, and the protrusion may be inserted into the guide groove 414 of the movable barrel member 410. In this embodiment, the zoom lens housed in the lens cover is a zoom lens with a variable optical length, but this is not limited thereto and may be a zoom lens with a fixed optical length. Furthermore, the lens cover 400 may be prepared with multiple fixed barrel members 401 or movable barrel members 410 with different lengths and / or diameters, allowing the barrel members to be appropriately replaced depending on the size of the lens barrel (total length or diameter). In this case, it is preferable that the fixed barrel member 401 and the movable barrel member 410 be configured to be easily disassembled when the lens cover 400 is detached from the camera body 100. Furthermore, it is possible to accommodate lens barrels with zoom rings having various rotation angles for zoom adjustment by appropriately changing the shape of guide groove 414 of movable barrel member 410. [Explanation of symbols]

[0057] 100 camera body 203 Zoom Ring 253 Zoom Ring 300 Adjustable Ring 400 Lens Cover 401 Fixed cylindrical member (first cylindrical member) 410 Movable cylindrical member (second cylindrical member) 440 Support part 450 conversion unit O100 optical axis

Claims

1. A lens cover that houses an interchangeable lens that is attached to an imaging device capable of capturing images and has a zoom ring that is rotated around an optical axis of the imaging device during zoom adjustment, a first cylindrical member detachably fixed to the imaging device; a second cylindrical member arranged concentrically with the first cylindrical member; a support portion that restricts rotation of the second cylindrical member about the optical axis relative to the first cylindrical member and supports the second cylindrical member movably along the optical axis direction; a conversion unit that converts linear movement of the second cylindrical member along the optical axis direction into rotational movement that rotates the zoom ring, the support portion has a first guide groove formed along the optical axis in one of the first cylindrical member and the second cylindrical member, and a first protrusion formed to protrude from the other cylindrical member and guided by the first guide groove, the converting portion is provided inside the second cylindrical member as a separate member from the second cylindrical member, and includes an engaging member that engages with the zoom ring, a second guide groove formed in one of the second cylindrical member and the engaging member, and a second protruding portion that is formed to protrude from the other member and is guided by the second guide groove; The lens cover is characterized in that the second guide groove has an inclined groove formed at an angle with respect to the optical axis, an axial groove formed along the optical axis direction on the side of the imaging device closer to the inclined groove, and a circumferential groove formed along the circumferential direction of one of the members between the inclined groove and the axial groove and communicating with the inclined groove and the axial groove.

2. the first cylindrical member is configured to be fixed to the imaging device by rotating around the optical axis, The lens cover according to claim 1, characterized in that the length of the circumferential groove along the circumferential direction is the same as the amount of rotation of the first cylindrical member when the first cylindrical member is fixed to the imaging device.

3. A lens cover that houses an interchangeable lens that is attached to an imaging device capable of capturing images and has a zoom ring that is rotated around an optical axis of the imaging device during zoom adjustment, a first cylindrical member detachably fixed to the imaging device; a second cylindrical member arranged concentrically with the first cylindrical member; a support portion that restricts rotation of the second cylindrical member about the optical axis relative to the first cylindrical member and supports the second cylindrical member movably along the optical axis direction; a conversion unit that converts linear movement of the second cylindrical member along the optical axis direction into rotational movement that rotates the zoom ring, the support portion has a first guide groove formed along the optical axis in one of the first cylindrical member and the second cylindrical member, and a first protrusion formed to protrude from the other cylindrical member and guided by the first guide groove, the converting portion is provided inside the second cylindrical member as a separate member from the second cylindrical member, and includes an engaging member that engages with the zoom ring, a second guide groove formed in one of the second cylindrical member and the engaging member, and a second protruding portion that is formed to protrude from the other member and is guided by the second guide groove; the second guide groove has an inclined groove formed at an angle with respect to the optical axis, The lens cover is characterized in that the engagement member has a clamping portion that clamps the zoom ring in a direction perpendicular to the optical axis.

4. the clamping portion is composed of a pair of clamping pieces that can approach and move away from each other in a direction perpendicular to the optical axis, 4. The lens cover according to claim 3, wherein the engaging member has an adjustment portion that adjusts the distance between the clamping pieces in accordance with the outer diameter of the zoom ring.

5. 5. The lens cover according to claim 1, wherein the length of the first guide groove along the optical axis direction is longer than the length of the inclined groove along the optical axis direction.

6. 6. The lens cover according to claim 1, wherein the length of the inclined groove along the circumferential direction of the one member is the same as the maximum rotation amount of the zoom ring.

7. 7. The lens cover according to claim 1, wherein the second cylindrical member slides inside the first cylindrical member when moving along the optical axis direction.

8. 8. The lens cover according to claim 1, wherein the second cylindrical member is provided with a marker that indicates the degree of zoom adjustment.

9. The lens cover according to any one of claims 1 to 8, characterized in that a sealing portion is provided between the first cylindrical member and the imaging device, and between the first cylindrical member and the second cylindrical member, respectively, to seal the gap between the first cylindrical member and the imaging device.

10. a front cover member having a transparent portion that covers the interchangeable lens from the front side and that is fixed to the second cylindrical member; 10. The lens cover according to claim 1, wherein a sealing portion is provided between the front cover member and the second cylindrical member to seal the gap.

Images