Lens barrel

Abstract

The utility model aims to provide a lens barrel capable of improving appearance quality. The lens barrel includes: a first frame; a second frame which holds the lens positioned closest to the object side, is accommodated in the first frame, and is adjustable in position and / or inclination with respect to the first frame; and a third frame attached to the first frame and disposed between the inner periphery of the first frame and the outer periphery of the second frame when viewed from the object side. In the lens barrel, in the optical axis direction, a first portion of the second frame, which is located closest to the object side, is located between a second portion of the third frame, which is located closest to the object side, and a third portion of the third frame, which is located closest to the image side.

Description

Technical Field

[0001] The present utility model relates to a lens barrel. Background Art

[0002] There is known a technique for improving the appearance quality by disposing a decorative ring on the front side (object side) of a lens frame that holds a lens located at the position closest to the object side (first group of lenses) in a lens barrel in which the optical axis is adjusted, covering the optical axis adjustment mechanism, etc. (for example, Patent Documents 1, 2, etc.).

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2016-109750

[0004] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2017-116788 Summary of the Utility Model

[0005] One embodiment of the technology of the present utility model provides a lens barrel capable of improving the appearance quality.

[0006] (1) A lens barrel, comprising: a first frame; a second frame that holds a lens located at the position closest to the object side, is accommodated in the first frame, and is capable of adjusting its position and / or inclination relative to the first frame; and a third frame that is mounted on the first frame and is disposed between the inner circumference of the first frame and the outer circumference of the second frame when viewed from the object side. In the optical axis direction, a first portion of the second frame located at the position closest to the object side is located between a second portion of the third frame located at the position closest to the object side and a third portion of the third frame located at the position closest to the image side.

[0007] (2) The lens barrel according to (1), wherein the first portion is located at a position retracted by a distance δ or more toward the image side compared to the second portion.

[0008] (3) The lens barrel according to (2), wherein the distance δ is set to a value exceeding the maximum displacement amount of the first portion in the optical axis direction caused by adjustment.

[0009] (4) The lens barrel according to (1), wherein when the position and / or inclination of the second frame are adjusted by the maximum adjustment amount, the first portion is located at a position retracted by a distance ξ or more toward the image side compared to the second portion.

[0010] (5) The lens barrel according to (4), wherein the distance ξ is 0.3 mm.

[0011] (6) The lens barrel according to any one of (1) to (5), wherein when viewed from the object side, the third frame has an annular recess in its inner circumferential portion, and the first portion is located closer to the object side than a fourth portion of the recess located at the position closest to the image side.

[0012] (7) The lens barrel according to any one of (1) to (6), wherein the third frame has an annular convex portion on the inner peripheral portion of the end face on the object side.

[0013] (8) The lens barrel according to (7), wherein the convex portion of the third frame has a conical shape with a diameter decreasing toward the object side.

[0014] (9) The lens barrel according to (7) or (8), wherein the end portion of the second frame on the object side has a conical shape with a diameter decreasing toward the image side.

[0015] (10) The lens barrel according to (7), wherein the convex portion of the third frame has a stepped shape with a diameter decreasing stepwise toward the object side.

[0016] (11) The lens barrel according to (9) or (10), wherein the end portion of the second frame on the object side has a stepped shape with a diameter decreasing stepwise toward the image side.

[0017] (12) The lens barrel according to any one of (1) to (11), wherein when viewed from the object side, the second frame has a first portion at a position adjacent to the inner periphery of the third frame.

[0018] (13) The lens barrel according to any one of (1) to (12), wherein when viewed from the object side, the first portion and the second portion are arranged adjacent to each other.

[0019] (14) The lens barrel according to any one of (1) to (13), wherein the first portion and the second portion have the same hue.

[0020] (15) The lens barrel according to (14), wherein the chroma of the Munsell chromaticity values of the first portion and the second portion is below a threshold value.

[0021] (16) The lens barrel according to (14) or (15), wherein the color difference between the first portion and the second portion in the hue circle of the Munsell color system is below a threshold value.

[0022] (17) The lens barrel according to any one of (14) to (16), wherein the first portion and the second portion of the second frame and the third frame have a relatively high lightness.

[0023] (18) The lens barrel according to any one of (14) to (17), wherein the first portion and the second portion have a relatively higher lightness than the outer peripheral surface of the second frame and the inner peripheral surface of the third frame.

[0024] (19) The lens barrel according to any one of (1) to (18), wherein the third frame is a nameplate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view showing the external structure of the interchangeable lens.

[0026] Figure 2 is a side view showing the external structure of the interchangeable lens.

[0027] Figure 3 is a cross-sectional view showing the schematic structure inside the interchangeable lens.

[0028] Figure 4 is a view showing the schematic structure of the tilt adjustment mechanism.

[0029] Figure 5 is an enlarged view of one of the mounting parts.

[0030] Figure 6 is Figure 5 a sectional view taken along line 6-6 of

[0031] Figure 7 is a sectional perspective view showing the mounting structure of the decorative ring.

[0032] Figure 8 is an enlarged cross-sectional view of the mounting part of the decorative ring.

[0033] Figure 9 is a sectional perspective view showing the structure of the main part of the interchangeable lens according to the second embodiment.

[0034] Figure 10 is an enlarged cross-sectional view of the main part of the interchangeable lens according to the second embodiment.

[0035] Figure 11 is a front view showing an example of an interchangeable lens in which the first part and the second part are brighter than the surroundings.

[0036] Figure 12 is an enlarged view of a part of Figure 11 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0038] ​Here, an example in which the present utility model is applied to an interchangeable lens of a lens interchangeable camera will be described. A lens interchangeable camera is a camera that can freely replace lenses. In particular, in the present embodiment, an example in which the present utility model is applied to an interchangeable lens of a mirrorless single-lens camera will be described. A mirrorless single-lens camera is one of the classifications of digital cameras, and is a general term for a lens interchangeable digital camera that replaces the optical viewfinder of a single-lens reflex camera and confirms the image through an electronic viewfinder (electronic viewfinder: EVF) or a live preview monitor (a monitor provided on the back or side of the camera body).

[0039] [First Embodiment]

[0040] [External Structure of Interchangeable Lens]

[0041] Figure 1 is a front view showing the external structure of the interchangeable lens. Figure 2 is a side view showing the external structure of the interchangeable lens. In addition, in Figure 2 the left side of the paper surface is the object side, and the right side is the image side. The object side is the front side of the interchangeable lens 1, and the image side is the rear side of the interchangeable lens.

[0042] As described above, the interchangeable lens 1 of the present embodiment is an interchangeable lens of a mirrorless single-lens camera. In particular, Figure 1 and Figure 2 the interchangeable lens 1 shown is an interchangeable lens with a zoom function (so-called zoom lens). And, Figure 1 and Figure 2 the interchangeable lens 1 shown is a zoom lens with an electric zoom (also called power zoom) function. Electric zoom is a function that electrically zooms in response to a zoom operation performed by the user. And, Figure 1 and Figure 2 the interchangeable lens 1 shown is a lens with a fixed overall length. A lens with a fixed overall length is a lens whose overall length does not change due to zooming and focusing operations.

[0043] As shown in Figure 1 and Figure 2 the interchangeable lens 1 has a cylindrical lens barrel 10.

[0044] As shown in Figure 2 the interchangeable lens 1 has a bayonet 11 at the rear end (image side end) of the lens barrel 10. The interchangeable lens 1 is detachably mounted on the camera body via the bayonet 11. The standard of the bayonet is not particularly limited. As an example, in the present embodiment, a bayonet mount is adopted.

[0045] As shown in Figure 2 the interchangeable lens 1 has a focusing ring 12 and a zoom ring 13 on the outer periphery of the lens barrel 10.

[0046] The focus ring 12 is an operating member for focusing operation. The focus ring 12 is provided for rotational operation in the circumferential direction of the lens barrel 10. In the present embodiment, the focus ring 12 can rotate forward and reverse. The interchangeable lens 1 controls the focusing direction according to the rotation direction of the focus ring 12. Moreover, in the present embodiment, the focus ring 12 can rotate without restriction. The interchangeable lens 1 controls the movement amount of the focus (the movement amount of the focus position) according to the rotation angle (rotation amount) of the focus ring 12.

[0047] The zoom ring 13 is an operating member for zoom operation. The zoom ring 13 is provided for rotational operation in the circumferential direction of the lens barrel 10. In the present embodiment, the zoom ring 13 can rotate forward and backward. The interchangeable lens 1 controls the zoom direction (zoom in or out) according to the rotation direction of the zoom ring 13. Moreover, in the present embodiment, the zoom ring 13 can rotate without restriction. The interchangeable lens 1 controls the zoom amount (the amount of change in focal length) according to the rotation angle of the zoom ring 13.

[0048] [Internal structure of the interchangeable lens]

[0049] Figure 3 2 is a cross-sectional view showing a schematic structure of the interior of an interchangeable lens. Figure 3 In the figure, the left side of the paper is the object side, and the right side is the image side.

[0050] [Optical system structure]

[0051] like Figure 3 As shown, the interchangeable lens 1 of this embodiment has a first lens group L1, a second lens group L2, a third lens group L3, a fourth lens group L4, and a fifth lens group L5 in order from the object side to the image side. In addition, the interchangeable lens 1 of this embodiment has an aperture S between the second lens group L2 and the third lens group L3.

[0052] In the interchangeable lens 1 of this embodiment, the first lens group L1, the third lens group L3 and the fifth lens group L5 are fixed lens groups, while the second lens group L2 and the fourth lens group L4 are movable lens groups. Each lens group is composed of at least one lens.

[0053] The interchangeable lens 1 changes the focal position by moving the fourth lens group L4 along the optical axis Z. In other words, the focus is adjusted.

[0054] Furthermore, the interchangeable lens 1 changes the focal length by moving the second lens group L2 along the optical axis Z. That is, zooming is performed. In addition, during zooming, the fourth lens group L4 also moves. The fourth lens group L4 moves in conjunction with the second lens group L2 to correct the change in the focal position accompanying zooming. That is, the fourth lens group L4 also functions as a compensator.

[0055] The aperture S is constituted by a variable aperture, for example. The aperture S including a unit (aperture unit) SU of its drive mechanism is disposed between the second lens group L2 and the third lens group L3.

[0056] The interchangeable lens 1 of the present embodiment has an inclination adjustment function as an optical adjustment function. The inclination adjustment is performed by the first lens group L1. Specifically, the inclination adjustment is performed by inclining the optical axis of the first lens group L1 with respect to the optical axis Z of the lens barrel 10.

[0057] [Lens Barrel]

[0058] The lens barrel 10 has a barrel body 20 and an exterior body 80.

[0059] The barrel body 20 is a so-called fixed barrel and is a component that is fixed to the camera body when the interchangeable lens 1 is attached to the camera body. A bayonet 11 is provided at the rear end of the barrel body 20.

[0060] The optical system is housed in the barrel body 20.

[0061] The first lens group L1 is a lens located at the position closest to the object side in the optical axis direction. The first lens group L1 is held by the first lens frame 30 and is housed in the barrel body 20. As described above, the first lens group L1 is a fixed lens group. Therefore, the first lens frame 30 is fixed to the barrel body 20 and is disposed at a specified position in the barrel body 20.

[0062] In addition, as described above, in the interchangeable lens 1 of the present embodiment, the inclination adjustment is performed by the first lens group L1. The inclination adjustment is performed by inclining the first lens frame 30 with respect to the optical axis Z of the lens barrel 10. The mechanism for adjusting the inclination will be described later. In the interchangeable lens 1 of the present embodiment, the first lens frame 30 is an example of a second frame.

[0063] The second lens group L2 is held by the second lens frame 40 and is housed in the barrel body 20. As described above, the second lens group L2 is a movable lens group. Therefore, the second lens frame 40 is movably provided. A guide shaft 21 for guiding the movement of the second lens frame 40 is provided in the barrel body 20. The guide shaft 21 is disposed along the optical axis Z.

[0064] The driving of the second lens group L2 is performed by a zoom motor 22. The zoom motor 22 is constituted by a coreless motor, for example. A lead screw 23 is disposed along the optical axis Z in the barrel body 20. The second lens frame 40 is connected to a nut 24 attached to the lead screw 23. The zoom motor 22 rotates the lead screw 23. If the lead screw 23 is rotated by the zoom motor 22, the nut 24 moves along the lead screw 23. Thereby, the second lens frame 40 moves along the optical axis Z. And thereby, the second lens group L2 moves along the optical axis Z.

[0065] The third lens group L3 is held by the third lens frame 50 and is housed in the lens barrel main body 20. As described above, the third lens group L3 is a fixed lens group. Therefore, the third lens frame 50 is fixed to the lens barrel main body 20 and is disposed at a specified position in the lens barrel main body 20.

[0066] The aperture unit SU is mounted on the third lens frame 50 and is housed in the lens barrel main body 20. As described above, the aperture unit SU is disposed between the second lens group L2 and the third lens group L3.

[0067] The fourth lens group L4 is held by the fourth lens frame 60 and is housed in the lens barrel main body 20. As described above, the fourth lens group L4 is a movable lens group. Therefore, the fourth lens frame 60 is movably provided. A main shaft 25 and a sub-shaft 26 for guiding the movement of the fourth lens frame 60 are provided in the lens barrel main body 20. Both the main shaft 25 and the sub-shaft 26 are arranged along the optical axis Z.

[0068] The driving of the fourth lens group L4 is performed by a focusing motor (not shown). The focusing motor is constituted by a linear motor, for example. The focusing motor directly moves the fourth lens frame 60 along the main shaft 25 and the sub-shaft 26. Thereby, the fourth lens group L4 moves along the optical axis Z.

[0069] The fifth lens group L5 is held by the fifth lens frame 70 and is housed in the lens barrel main body 20. As described above, the fifth lens group L5 is a fixed lens group. Therefore, the fifth lens frame 70 is fixed to the lens barrel main body 20 and is disposed at a specified position in the lens barrel main body 20.

[0070] The exterior body 80 is mainly constituted by a front cover 81 and a rear cover 82. The front cover 81 is mounted on the outer periphery of the front end of the lens barrel main body 20. A light-shielding groove 81A is provided on the inner peripheral surface of the front cover 81. The rear cover 82 is mounted on the outer peripheral portion of the rear end of the lens barrel main body 20. The front cover 81 and the rear cover 82 mounted on the lens barrel main body 20 are respectively fixed to the lens barrel main body 20 by screws (not shown), and thus are integrated with the lens barrel main body 20. In the interchangeable lens 1 of the present embodiment, the integrated object of the lens barrel main body 20 and the exterior body 80 is an example of the first frame.

[0071] As Figure 1 and Figure 3As shown in the figure, a ring-shaped decorative ring 100 is installed on the inner peripheral portion of the front cover 81. The decorative ring 100 is arranged in a manner orthogonal (including a substantially orthogonal state) to the optical axis Z, and is disposed between the inner periphery of the front cover 81 and the outer periphery of the first lens frame 30 when the lens barrel 10 is viewed from the object side. The decorative ring 100 functions as a nameplate, and various specifications or explanations (so-called parameters) regarding the interchangeable lens 1 are recorded on its surface (the end face on the object side). For example, information such as focal length, open F value, filter diameter, glass used, lens used, coating used, and manufacturer name is recorded. As an example, in Figure 1 an example is shown in which information on the lens used (ASPHERICAL LENS (aspherical lens)), information on the focal length (18 - 120 mm), information on the open F value (F4), and information on the filter diameter (φ72) are recorded. The mounting structure of the decorative ring 100 will be described later. In the present embodiment, the decorative ring 100 is an example of the third frame.

[0072] [Tilt adjustment mechanism]

[0073] As described above, the tilt adjustment of the interchangeable lens 1 in the present embodiment is performed by tilting the first lens frame 30 relative to the optical axis Z of the lens barrel 10.

[0074] As Figure 3 shown, the first lens frame 30 is composed of a first lens frame main body 31 and a fixing ring 32.

[0075] The first lens frame main body 31 has a cylindrical shape, and holds the first group of lenses L1 in its inner peripheral portion.

[0076] The fixing ring 32 is a component for fixing the first group of lenses L1 to the first lens frame main body 31. The fixing ring 32 has a fixing ring main body 32A and a flange portion 32B. The fixing ring main body 32A has an annular shape. The flange portion 32B is a flange-shaped portion protruding from the outer periphery of the rear end portion of the fixing ring main body 32A. The flange portion 32B has an external thread portion 32C on its outer periphery. The fixing ring 32 is mounted on the first lens frame main body 31 by engaging the external thread portion 32C with an internal thread portion 31A provided on the inner periphery of the first lens frame main body 31. The fixing ring 32 mounted on the first lens frame main body 31 engages with the first group of lenses L1 held by the first lens frame main body 31 to fix the first group of lenses L1 to the first lens frame main body 31.

[0077] Figure 4 is a diagram showing the schematic structure of the tilt adjustment mechanism. Figure 4 Corresponds to Figure 3 the 4 - 4 cross-sectional view.

[0078] As Figure 4As shown, the first lens frame 30 is provided with a mounting portion 33 for mounting the first lens frame 30 to the lens barrel main body 20. The mounting portion 33 is provided at three locations on the outer periphery of the first lens frame main body 31. Each mounting portion 33 has the same structure. The mounting portions 33 are arranged at equal intervals (120° intervals) along the circumferential direction.

[0079] Figure 5 It is a view magnifying one of the mounting portions. Figure 6 is Figure 5 a sectional view taken along line 6-6 of

[0080] The mounting portion 33 is formed of a rectangular plate-like piece orthogonal to the optical axis and is arranged to protrude in the outer diameter direction. The mounting portion 33 is provided with a threaded mounting hole 33A for threadedly fixing the first lens frame 30 to the lens barrel main body 20. The threaded mounting hole 33A is formed of a through hole. Further, the mounting portion 33 is provided with a spring engaging portion 33B. The spring engaging portion 33B is formed of a concave portion and is provided on the back surface (the rear end surface) of the mounting portion 33.

[0081] The first lens frame 30 is assembled to the lens barrel main body 20 by passing an adjustment screw 91 through the threaded mounting hole 33A of each mounting portion 33 and threadedly fixing it to the lens barrel main body 20.

[0082] At the front end of the lens barrel main body 20, three support portions 92 are provided at three locations corresponding to the three mounting portions 33 of the first lens frame 30. The support portion 92 is formed of a concave portion capable of accommodating the mounting portion 33 and is arranged at equal intervals (120° intervals) along the circumferential direction.

[0083] The support portion 92 is provided with a threaded hole 92A and a spring 93. The threaded hole 92A is arranged along the optical axis Z. The spring 93 is formed of a helical spring and is arranged along the optical axis Z. The spring 93 is held by a spring holding portion 92B provided in the support portion 92 and is thus provided in the support portion 92. The spring holding portion 92B is formed of a concave portion capable of accommodating the spring 93. The base end portion of the spring 93 is accommodated in the spring holding portion 92B and is thus arranged in the support portion 92.

[0084] The first lens frame 30 is assembled to the lens barrel main body 20 by aligning the positions of the mounting portions 33 with the positions of the support portions 92 and threadedly fixing the mounting portions 33 to the support portions 92 with the adjustment screws 91. The threaded fixing is performed by passing the adjustment screws 91 through the threaded mounting holes 33A of the mounting portions 33 and tightening them into the threaded holes 92A of the support portions 92.

[0085] The spring 93 of the support portion 92 of the first lens frame 30 assembled to the lens barrel main body 20 engages with the spring engaging portion 33B provided in each mounting portion 33. As a result, the first lens frame 30 is individually stressed forward at each mounting portion 33.

[0086] By performing an operation of individually thread-fixing or loosening the adjustment screw 91 on the first lens frame 30 in which each mounting portion 33 is individually biased by the spring 93, the position of each mounting portion 33 is individually moved back and forth. As a result, the inclination of the first lens frame 30 is adjusted. That is, tilt adjustment is performed.

[0087] Normally, the tilt adjustment is performed when assembling the interchangeable lens 1. After the adjustment, each mounting portion 33 is adhesively fixed to the support portion 92 using an adhesive to maintain the adjusted state.

[0088] [Mounting Structure of Decorative Ring]

[0089] As described above, in the interchangeable lens 1 of the present embodiment, the decorative ring 100 is mounted on the inner peripheral portion of the front cover 81. When observing the lens barrel 10 from the object side, the decorative ring 100 is disposed between the inner periphery of the front cover 81 and the outer periphery of the first lens frame 30. By mounting the decorative ring 100, the gap generated between the inner periphery of the lens barrel main body 20 and the outer periphery of the first lens frame 30 can be visually blocked, thereby improving the appearance quality of the interchangeable lens 1.

[0090] Figure 7 It is a cross-sectional perspective view showing the mounting structure of the decorative ring. Figure 8 It is a cross-sectional view of the mounting portion of the decorative ring enlarged.

[0091] The decorative ring 100 is configured as a thin plate-like member having an annular shape.

[0092] The end face on the rear side (image side) of the decorative ring 100 is configured as the mounting surface 101 for the front cover 81. The mounting surface 101 is composed of a flat surface.

[0093] The outer peripheral portion of the end face on the front side (object side) of the decorative ring 100 is composed of a flat surface 102, and the inner peripheral portion is composed of a stepped inclined surface 103.

[0094] The flat surface 102 is configured as the marked portion in the nameplate (refer to Figure 1 ). That is, the items to be recorded when using the decorative ring 100 as a nameplate are marked on the flat surface 102.

[0095] The inclined surface 103 is constituted by an annular convex portion 104 having a stepped inclined surface. The convex portion 104 is provided at the inner peripheral portion of the flat surface 102. And the convex portion 104 has a stepped shape in which the diameter gradually decreases toward the object side. In other words, the convex portion 104 has a stepped shape in which the forward protrusion amount gradually increases from the outer side in the radial direction toward the inner side. Therefore, in the decorative ring 100, the portion at the foremost position in the optical axis direction is the front end portion of the innermost peripheral portion of the decorative ring 100. More specifically, it is the front end face 105 on the front side of the innermost peripheral portion. In addition, in the decorative ring 100, the portion at the rearmost position (image side) in the optical axis direction is the rear end face of the decorative ring 100, which is the mounting surface 101.

[0096] A decorative ring mounting portion 81B is provided at the inner peripheral portion of the front cover 81. The decorative ring mounting portion 81B protrudes from the inner peripheral portion of the front cover 81 as a flange-shaped convex portion having an annular shape. In the decorative ring mounting portion 81B, a concave portion 81C for fitting the decorative ring 100 is provided on the front end face. The decorative ring 100 is inserted into the concave portion 81C and fixed to prevent it from falling off, thereby being mounted on the decorative ring mounting portion 81B. The fixing of the decorative ring 100 is performed by, for example, double-sided tape or an adhesive. The flat surface 102 of the outer peripheral portion on the front side of the decorative ring 100 mounted on the decorative ring mounting portion 81B is located on the same surface as the front end face of the decorative ring mounting portion 81B. In addition, the "same surface" here includes the range considered to be substantially the same surface (so-called substantially the same surface).

[0097] When observing the lens barrel 10 from the object side, the decorative ring 100 mounted on the front cover 81 is disposed between the inner periphery of the front cover 81 and the outer periphery of the first lens frame 30. In other words, the first lens frame 30 is disposed inside the decorative ring 100. In the present embodiment, the decorative ring 100 is disposed in such a manner that the front end portion (the end portion on the object side) of the first lens frame 30 is accommodated in the inner peripheral portion of the decorative ring 100. The decorative ring 100 is disposed with a predetermined gap ε from the outer periphery of the front end portion of the first lens frame 30. The gap ε is set in consideration of the adjustment margin for tilt adjustment and the like, and should be as small as possible. Therefore, at the fitting portion (the portion where the first lens frame 30 is fitted into the inner peripheral portion of the decorative ring 100), the decorative ring 100 and the first lens frame 30 are disposed adjacent to each other in the radial direction.

[0098] Here, in the present embodiment, the fixing ring 32 constitutes the front end portion of the first lens frame 30. Therefore, the decorative ring 100 is disposed on the outer periphery of the fixing ring 32. More specifically, the decorative ring 100 is disposed on the outer periphery of the fixing ring main body 32A (the portion of the fixing ring 32 that is more forward than the flange portion 32B).

[0099] The end portion on the front side (object side) of the fixed ring main body 32A has a stepped shape in which the diameter gradually decreases toward the image side. In other words, it has a stepped shape in which the amount of retreat toward the rear gradually increases from the outer side in the radial direction toward the inner side. As a result, the front end surface on the inner periphery of the fixed ring main body 32A is constituted by a stepped inclined surface 32D. And, as a result, the front end portion of the outermost peripheral portion of the fixed ring main body 32A of the fixed ring 32 becomes the portion located at the most front side in the optical axis direction. More specifically, the front end surface 32E of the outermost peripheral portion of the fixed ring main body 32A becomes the portion located at the most front side in the optical axis direction. This portion is also the portion located at the most front side in the first lens frame 30.

[0100] [Relationship between the decorative ring and the first lens frame]

[0101] In the relationship with the first lens frame 30, the decorative ring 100 is arranged to satisfy the following necessary conditions. That is, the decorative ring 100 is arranged such that, in the optical axis direction, the portion (first portion) located at the most front side of the first lens frame 30 is located between the portion (second portion) located at the most front side and the portion (third portion) located at the most rear side of the decorative ring 100. As described above, in the optical axis direction, the portion (first portion) located at the most front side of the first lens frame 30 is the front end surface 32E of the outermost peripheral portion of the fixed ring main body 32A. On the other hand, in the decorative ring 100, the portion (second portion) located at the most front side in the optical axis direction is the front end surface 105 of the innermost peripheral portion of the decorative ring 100. And, in the decorative ring 100, the portion (third portion) located at the most rear side in the optical axis direction is the mounting surface 101.

[0102] Therefore, the decorative ring 100 is arranged such that the front end surface 32E (first portion) of the outermost peripheral portion of the fixed ring main body 32A is located between the front end surface 105 (second portion) of the innermost peripheral portion and the mounting surface 101 (third portion). This means that the portion (first portion) located at the most front side of the fixed ring 32 is located at a more rearward position than the portion (second portion) located at the most front side of the decorative ring 100. That is, it means that the portion (first portion) located at the most front side of the fixed ring 32 does not protrude forward from the inner periphery of the decorative ring 100. And, it means that, in the optical axis direction, the portion (first portion) located at the most front side of the fixed ring 32 is arranged within the thickness t of the decorative ring 100.

[0103] By arranging the decorative ring 100 and the first lens frame 30 in a manner that satisfies the above necessary conditions, the following effects can be obtained.

[0104] The interchangeable lens 1 of the present embodiment has an inclination adjustment function as an optical adjustment function. The inclination adjustment is performed by adjusting the inclination of the first lens group L1. Moreover, the inclination of the first lens group L1 is adjusted by the first lens frame 30. That is, the inclination of the first lens group L1 is adjusted by inclining the first lens frame 30 relative to the lens barrel main body 20.

[0105] The first lens frame 30 is a lens frame located at the foremost position in the optical axis direction and is a lens frame that can be visually recognized on the exterior. Therefore, if the inclination is visually recognized, the quality of the exterior will be impaired. Moreover, there is also a risk of being misidentified as a defective product.

[0106] In the interchangeable lens 1 of the present embodiment, the front end portion (the front end portion of the fixed ring main body 32A) of the first lens frame 30 can be visually recognized from the inner peripheral portion of the decorative ring 100.

[0107] The first lens frame 30 and the decorative ring 100 are adjacent to each other in the radial direction at their fitting portions. Therefore, if the front end portion of the first lens frame 30 inclines in a state of protruding from the decorative ring 100, the inclination will become obvious and will be easily visually recognized on the exterior. In particular, in the case of the interchangeable lens 1 of the present embodiment, when the portion (end face 105) at the foremost position of the decorative ring 100 and the portion (end face 32E) at the foremost position of the first lens frame 30 are adjacent to each other in the radial direction, if the portion (end face 32E) at the foremost position of the first lens frame 30 inclines in a state of protruding from the decorative ring 100, the inclination will become obvious and will be easily visually recognized on the exterior.

[0108] However, in the case of the interchangeable lens 1 of the present embodiment, if the front end portion of the first lens frame 30 retreats inward (image side) from the front end of the decorative ring 100, even when the first lens frame 30 is inclined, its inclination can be made less likely to be visually recognized. That is, in the case of the interchangeable lens 1 of the present embodiment, since the portion visually recognized in the first lens frame 30 is substantially limited to the portion visually recognized from the front, the inclination can be made less likely to be visually recognized.

[0109] In this way, according to the interchangeable lens 1 of the present embodiment, even when the first lens frame 30 is inclined by inclination adjustment, its inclination can be made less likely to be visually recognized from the exterior. Thereby, the exterior quality of the interchangeable lens 1 can be improved. In particular, in the case of the interchangeable lens 1 of the present embodiment, in the structure of the first portion having a portion adjacent to the inner periphery of the decorative ring 100 and the structure in which the first portion and the second portion are arranged adjacent to each other in the radial direction, the inclination of the first lens frame 30 can be made less likely to be visually recognized, and thus the exterior quality can be improved.

[0110] In addition, the effect of making the inclination of the first lens frame 30 less visually recognizable is achieved by disposing the portion (the first portion) of the first lens frame 30 at the most forward position at a position further rearward than the portion (the second portion) of the decorative ring 100 at the most forward position. In order to maintain the relationship that the first portion is always disposed at a position further rearward than the second portion even when the inclination is adjusted, it is necessary that, in the unadjusted state, the first portion is located at a position retracted rearward by a distance δ or more from the second portion. This distance δ is set according to the amount of displacement of the first portion in the optical axis direction caused by the inclination adjustment. Specifically, it is set to a value exceeding the maximum amount of displacement of the first portion in the optical axis direction caused by the inclination adjustment. In addition, the "maximum amount of displacement" here represents the amount of displacement of the first portion when adjusted from the unadjusted state with the maximum adjustment amount. Therefore, for example, when the amount of displacement of the first portion in the optical axis direction when the inclination is adjusted from the unadjusted state with the maximum adjustment amount is 0.3 mm, the distance δ is set to a value exceeding 0.3 mm. For example, it is set that δ = 0.5 mm. Thus, even when the inclination is adjusted, the first portion is always disposed at a position further rearward by a certain distance or more from the second portion. That is, regardless of whether the inclination is adjusted, the state where the first lens frame 30 does not protrude from the decorative ring 100 is always maintained.

[0111] In addition, preferably, when the inclination of the first lens frame 30 is adjusted with the maximum adjustment amount, it is set that the first portion is located at a position retracted rearward by a distance ξ or more from the second portion. As an example, the distance ξ is ξ = 0.3 mm. That is, when the inclination of the first lens frame 30 is adjusted with the maximum adjustment amount, it is set that the first portion is located at a position retracted rearward by 0.3 mm or more from the second portion. Thereby, the inclination of the first lens frame 30 caused by the inclination adjustment can be made less obvious, and at the same time, the appearance quality can be improved. In particular, as in the interchangeable lens 1 of the present embodiment, when the adjacent end faces of the first lens frame 30 and the decorative ring 100 are formed by stepped inclined surfaces, the inclination of the first lens frame 30 can be made less obvious, and at the same time, the appearance quality can be improved.

[0112] In addition, if the first lens frame 30 is retracted too far rearward with respect to the decorative ring 100, vignetting may occur. And there may be a case where the appearance is damaged. In particular, if the retraction exceeds the thickness t of the decorative ring 100, a gap can be visually recognized, thereby reducing the appearance quality. Therefore, it is preferably set that the portion (the first portion) of the first lens frame 30 at the most forward position is located at a position more forward than the portion (the third portion) of the decorative ring 100 at the most rearward position.

[0113] [Second Embodiment]

[0114] Figure 9 This is a cross-sectional perspective view showing the structure of the main part of the interchangeable lens according to the second embodiment. And, Figure 10 This is a cross-sectional view showing an enlarged view of the main part of the interchangeable lens according to the second embodiment.

[0115] The structure of the decorative ring 100 of the interchangeable lens 1 in the present embodiment is different from the structure of the interchangeable lens 1 in the above-described first embodiment.

[0116] As Figure 9 and Figure 10 shown, the decorative ring 100 has an annular recess 106 in its inner peripheral portion. The bottom surface 107 of the recess 106 is formed by a plane orthogonal (including substantially orthogonal) to the optical axis Z. The bottom surface 107 of the recess 106 is the portion located at the rearmost (image side) position in the recess 106.

[0117] In the interchangeable lens 1 of the present embodiment, the bottom surface 107 of the recess 106 of the decorative ring 100 is the portion adjacent to the first lens frame 30 in the radial direction.

[0118] And, in the interchangeable lens 1 of the present embodiment, in the decorative ring 100, the innermost peripheral portion of the convex portion 104 is the portion located at the foremost (object side) position in the optical axis direction. More specifically, the front end surface 108 of the innermost peripheral portion of the convex portion 104 is the portion located at the foremost (object side) position in the optical axis direction (second portion) in the decorative ring 100. In the decorative ring 100 of the present embodiment, the front end surface 108 of the innermost peripheral portion of the convex portion 104 is the portion adjacent to the recess 106 in the radial direction.

[0119] Similar to the interchangeable lens 1 in the above-described first embodiment, the decorative ring 100 is arranged in such a manner as to satisfy the following necessary conditions in relation to the first lens frame 30. That is, it is arranged such that the portion (first portion) located at the foremost position of the first lens frame 30 is located between the portion (second portion) located at the foremost position and the portion (third portion) located at the rearmost position of the decorative ring 100.

[0120] Furthermore, in the present embodiment, the decorative ring 100 and the first lens frame 30 are arranged in such a manner as to satisfy the following necessary conditions. That is, it is arranged such that, when viewed from the front side (object side), the first portion of the first lens frame 30 is located at a more forward (object side) position than the fourth portion located at the rearmost (image side) position of the recess 106.

[0121] As described above, the portion (the fourth portion) of the concave portion 106 of the decorative ring 100 that is located at the rearmost position is the bottom surface of the concave portion 106. Therefore, the portion (the first portion) of the first lens frame 30 that is located at the foremost position is located on the front side (object side) of the bottom surface 107 (the fourth portion) of the concave portion 106.

[0122] Thus, in the interchangeable lens 1 of the present embodiment, the innermost peripheral portion of the decorative ring 100 (the portion that is adjacent to the outer periphery of the first lens frame 30 in the radial direction) is disposed on the rear side (image side) of the portion (the first portion) of the first lens frame 30 that is located at the foremost position. In this structure, similar to the interchangeable lens 1 of the first embodiment described above, the inclination of the first lens frame 30 can be made less visually recognizable, thereby improving the appearance quality.

[0123] In addition, if the width (width in the radial direction) of the concave portion 106 is too wide, the inclination will become more noticeable when the inclination adjustment is performed. Sometimes, it will also damage the appearance design. Therefore, it is preferably set to an appropriate width. For example, it can be set to the same width as or a width of the same degree as the width of the stepped portion in the stepped inclined surface 103. As an example, it can be set to a width of about 0.4 mm.

[0124] Also, the depth of the concave portion 106 is similarly preferably set to an appropriate depth. As an example, it can be set to a depth of about 0.8 mm.

[0125] [Other Embodiments]

[0126] [Color]

[0127] In order to make the inclination of the first lens frame 30 less visually recognizable in relation to the decorative ring 100, it is preferable that the decorative ring 100 and the first lens frame 30 have the same color.

[0128] In addition, the meaning of "the same color" means a color combination that is difficult for humans to distinguish colors. This combination can be obtained based on experience. For example, it can be determined according to theories such as the confusion color line theory.

[0129] As an example, in the case of having the same hue in the Munsell color system, it can be regarded as having "the same color". "The same hue" includes a range where the hues are considered to be substantially the same. The range where the hues are considered to be substantially the same is within the range where the color difference in the hue ring of the Munsell color system is below the threshold value. As an example, in the 20-hue ring of the Munsell color system, it is the same hue (the color difference is 18° or less) or within the range of adjacent hues (the color difference is 36° or less).

[0130] Also, for the same reason, the color of the decorative ring 100 and the first lens frame 30 preferably has a chroma of the Munsell colorimetric value below the threshold. That is, a low chroma is preferred. Therefore, achromatic colors are preferred.

[0131] Furthermore, the lightness of the Munsell colorimetric value of the decorative ring 100 and the first lens frame 30 is preferably below the threshold. That is, a low lightness is preferred. Therefore, black is preferred.

[0132] Based on the above, the decorative ring 100 and the first lens frame 30 are preferably made of the same color and are both black.

[0133] [Brightness of the first part and the second part]

[0134] As described above, the decorative ring 100 and the first lens frame 30 are preferably made of the same color, especially black. However, by locally changing the brightness (lightness), the inclination of the first lens frame 30 can be made less noticeable. Specifically, the first part and the second part are made relatively brighter than other parts.

[0135] Figure 11 is a front view showing an example of an interchangeable lens in which the first part and the second part are brighter than the surroundings. And, Figure 12 is an enlarged view of Figure 11 a part of (an enlarged view of the rectangular area W of Figure 11 ).

[0136] As Figure 11 and Figure 12 shown, the lightness of the front end part of the outermost periphery of the fixed ring main body 32A as the first part and the front end part of the innermost periphery of the decorative ring 100 as the second part is made relatively higher than other parts. More specifically, in Figure 11 and Figure 12 , as shown by the cross hatching, the lightness of the front end face 32E (the first part) of the front side of the outermost periphery of the fixed ring main body 32A and the front end face 105 (the second part) of the front side of the innermost periphery of the decorative ring 100 is made relatively higher than other parts. As an example, in the lightness of the Munsell color system, it is increased by three or more stages.

[0137] As a method of increasing the lightness, for example, a method of coating the area with a paint (bright paint) having a relatively higher lightness than other areas can be adopted. For example, when the whole is coated with black, the first part and the second part are coated with a black paint having a higher lightness. And, for example, in the case of using the color of the ground (when the color of the raw materials of the decorative ring 100 and the first lens frame 30 is black), a method of relatively increasing the lightness by coating the first part and the second part with a paint brighter than the color of the ground can be adopted.

[0138] In addition, a method of relatively increasing the brightness by making the surface roughness of this region smaller than that of other regions can also be adopted. That is, a method of relatively increasing the brightness by increasing the reflectance of the first part and the second part to be higher than the whole can be adopted.

[0139] In addition, the effect of making the inclination of the first lens frame 30 less noticeable is mainly generated by the brightness difference of the gap generated between the first part and the second part. Therefore, in order to obtain this effect, at least the first part and the second part may have a brightness higher than that of the surface forming the gap. Therefore, for example, regarding the first lens frame 30, at least the front end surface 32E (the first part) of the outermost peripheral part of the fixed ring body 32A may have a relatively higher brightness than the outer peripheral surface of the fixed ring body 32A. And regarding the decorative ring 100, at least the front end surface 105 (the second part) of the innermost peripheral part may have a relatively higher brightness than the inner peripheral surface of the decorative ring 100. Therefore, for example, by reducing the brightness of the outer peripheral surface of the fixed ring body 32A to be relatively lower than that of the end surface 32E and reducing the brightness of the inner peripheral surface of the decorative ring 100 to be relatively lower than that of the end surface 105, the same effect can also be obtained. In order to reduce the brightness of the outer peripheral surface of the fixed ring body 32A to be lower than that of the end surface 32E, for example, a method of coating the outer peripheral surface of the fixed ring body 32A with a coating having a brightness lower than that of the end surface 32E or a method of making the surface roughness of the outer peripheral surface of the fixed ring body 32A larger than that of the end surface 32E (reducing the reflectance) can be adopted. Similarly, in order to reduce the brightness of the inner peripheral surface of the decorative ring 100 to be relatively lower than that of the end surface 105, for example, a method of coating the inner peripheral surface of the decorative ring 100 with a coating having a brightness lower than that of the end surface 105 or a method of making the surface roughness of the inner peripheral surface of the decorative ring 100 larger than that of the end surface 105 (reducing the reflectance) can be adopted.

[0140] [Decorative ring]

[0141] The decorative ring 100 of the above-described embodiment is configured to have an annular convex portion 104 at the inner peripheral portion of the front end surface (object side), but it may also be configured to be flat.

[0142] Moreover, the convex portion 104 of the decorative ring 100 of the above-described embodiment is configured to have a stepped shape in which the diameter gradually decreases toward the front side, but it may also be configured to have a conical shape in which the diameter continuously decreases toward the front side.

[0143] The same applies to the first lens frame 30. That is, regarding the front end of the fixed ring body 32A, it may be configured to have a conical shape in which the diameter continuously decreases toward the rear side.

[0144] Further, the decorative ring 100 of the above-described embodiment is used as a nameplate, but it may also have no markings. Alternatively, other information (information other than specifications or instructions) may be displayed.

[0145] Further, the decorative ring 100 of the above-described embodiment has a circular shape that is completely closed, but it may also have a shape with a part open. The same applies to the shapes of the frames in the first frame, the second frame, and the third frame, and they are not limited to a shape that is completely closed in the circumferential direction, including a shape with a part of the circumference open.

[0146] [Optical adjustment function]

[0147] In the above-described embodiment, the case where the present utility model is applied to an interchangeable lens having a tilt adjustment function as an optical adjustment function has been described as an example, but the examples of the optical adjustment function are not limited thereto. In addition, for example, the present utility model can also be similarly applied to an interchangeable lens that replaces the tilt adjustment function or has an interaxial distance adjustment function in addition to the tilt adjustment function. The interaxial distance adjustment is performed, for example, by moving the lens group to be adjusted back and forth along the optical axis. When the interaxial distance is adjusted by the first lens group L1, the first lens frame 30 is moved back and forth along the optical axis. That is, the lens barrel main body 20 is relatively displaced along the optical axis Z. In addition, the interchangeable lens 1 described in the above-described embodiment can also perform interaxial distance adjustment. That is, the three mounting portions 33 of the first lens frame 30 are each moved by the same displacement amount. As a result, the first lens frame 30 moves back and forth along the optical axis while maintaining the same posture.

[0148] [Others]

[0149] In the above-described embodiment, the case where the present utility model is applied to an interchangeable lens having a zoom function has been described as an example, but the application of the present utility model is not limited thereto. It can also be similarly applied to the lens barrel of a so-called fixed-focus lens.

[0150] Further, in the above-described embodiment, the case where the present utility model is applied to the interchangeable lens of a lens-interchangeable camera has been described as an example, but the application of the present utility model is not limited thereto. It can also be similarly applied to the lens barrel of a lens provided in a lens-integrated camera. In addition, it can also be applied to the lens barrel of an optical device other than a camera. In addition to so-called still cameras, cameras also include various cameras such as video cameras, television cameras, and movie cameras.

[0151] Symbol description

[0152] 1 - Interchangeable lens, 10 - Lens barrel, 11 - Mount, 12 - Focus ring, 13 - Zoom ring, 20 - Barrel body, 21 - Guide shaft, 22 - Zoom motor, 23 - Lead screw, 24 - Nut, 25 - Main shaft, 26 - Sub - shaft, 30 - First lens frame, 31 - First lens frame body, 31A - Internal thread portion, 32 - Fixed ring, 32A - Fixed ring body, 32B - Flange portion, 32C - External thread portion, 32D - Inclined surface, 32E - End face, 33 - Mounting portion, 33A - Threaded mounting hole, 33B - Spring engagement portion, 40 - Second lens frame, 50 - Third lens frame, 60 - Fourth lens frame, 70 - Fifth lens frame, 80 - Outer housing, 81 - Front cover, 81A - Light - shielding groove, 81B - Decoration ring mounting portion, 81C - Recess, 82 - Rear cover, 91 - Adjusting screw, 92 - Support portion, 92A - Threaded hole, 92B - Spring holding portion, 93 - Spring, 100 - Decoration ring, 101 - Mounting surface, 102 - Flat surface, 103 - Inclined surface, 104 - Protrusion, 105 - End face, 106 - Recess, 107 - Bottom surface, 108 - End face, L1 - First lens group, L2 - Second lens group, L3 - Third lens group, L4 - Fourth lens group, L5 - Fifth lens group, S - Aperture, SU - Aperture unit, W - Rectangular area, Z - Optical axis.

Claims

1. A lens barrel, comprising: A first frame; A second frame that holds a lens positioned closest to the object side, is accommodated within the first frame, and is capable of adjusting its position and / or inclination relative to the first frame; and A third frame that is mounted on the first frame and, when viewed from the object side, is disposed between the inner circumference of the first frame and the outer circumference of the second frame, In the optical axis direction, a first portion of the second frame at the position closest to the object side is located between a second portion of the third frame at the position closest to the object side and a third portion of the third frame at the position closest to the image side.

2. The lens barrel according to claim 1, wherein The first portion is located at a position retracted by a distance δ or more toward the image side compared to the second portion.

3. The lens barrel according to claim 2, wherein The distance δ is set to a value exceeding the maximum displacement amount of the first portion in the optical axis direction caused by the adjustment.

4. The lens barrel according to claim 1, wherein When the position and / or inclination of the second frame is adjusted by the maximum adjustment amount, the first portion is located at a position retracted by a distance ξ or more toward the image side compared to the second portion.

5. The lens barrel according to claim 4, wherein The distance ξ is 0.3 mm.

6. The lens barrel according to claim 1, wherein When viewed from the object side, the third frame has an annular recess in its inner circumferential portion, The first portion is located closer to the object side than a fourth portion of the recess at the position closest to the image side.

7. The lens barrel according to claim 1, wherein The third frame has an annular protrusion in the inner circumferential portion of its end face on the object side.

8. The lens barrel according to claim 7, wherein The protrusion of the third frame has a conical shape with a diameter that decreases toward the object side.

9. The lens barrel according to claim 8, wherein The end portion of the second frame on the object side has a conical shape with a diameter that decreases toward the image side.

10. The lens barrel according to claim 7, wherein The protrusion of the third frame has a stepped shape with a diameter that decreases stepwise toward the object side.

11. The lens barrel according to claim 10, wherein The end portion of the second frame on the object side has a stepped shape with a diameter that decreases stepwise toward the image side.

12. The lens barrel according to claim 1, wherein When viewed from the object side, the second frame has the first portion at a position adjacent to the inner circumference of the third frame.

13. The lens barrel according to claim 1, wherein When viewed from the object side, the first portion and the second portion are arranged adjacent to each other.

14. The lens barrel according to any one of claims 1 to 13, wherein The first portion and the second portion have the same hue.

15. The lens barrel according to claim 14, wherein The chroma of the Munsell colorimetric values of the first portion and the second portion is below a threshold value.

16. The lens barrel according to claim 14, wherein The color difference between the first part and the second part in the hue circle of the Munsell color system is below the threshold value.

17. The lens barrel according to claim 14, wherein, The first part and the second part of the second frame and the third frame have relatively high lightness.

18. The lens barrel according to claim 14, wherein, The first part and the second part have relatively higher lightness than the outer peripheral surface of the second frame and the inner peripheral surface of the third frame.

19. The lens barrel according to any one of claims 1 to 13, wherein, The third frame is a nameplate.

Images