Lens barrel

Abstract

The present invention addresses the problem of providing a lens barrel capable of improving the quality of appearance. 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 invention relates to a lens barrel. Background Art

[0002] A technology is known in which, in a lens barrel in which the optical axis is adjusted by a lens located closest to the object side (first group lens), a decorative ring is arranged on the front side (object side) of a lens frame that holds the first group lens to cover an adjustment mechanism of the optical axis, etc., in order to improve the appearance quality (for example, patent documents 1, 2, etc.).

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

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

[0005] One embodiment of the technology according to the present invention 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 closest to an object, 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 an inner periphery of the first frame and an outer periphery of the second frame when viewed from the object side, wherein, in the optical axis direction, a first portion of the second frame located closest to the object is located between a second portion of the third frame located closest to the object and a third portion of the third frame located closest to the image side.

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

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

[0009] (4) The lens barrel according to (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 retreated toward the image side by a distance ξ or more than the second portion.

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

[0011] (6) A lens barrel according to any one of (1) to (5), wherein the third frame has an annular recessed portion on the inner peripheral portion when viewed from the object side, and the first portion is located closer to the object side than the fourth portion of the recessed portion which is located 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 an inner peripheral portion of an end surface on the object side.

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

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

[0015] (10) The lens barrel according to (7), wherein the convex portion of the third frame has a stepped shape in which a diameter gradually decreases 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 in which the diameter gradually decreases toward the image side.

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

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

[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 equal to or less than a threshold value.

[0021] (16) The lens barrel according to (14) or (15), wherein a hue difference between the first portion and the second portion in a hue circle of a Munsell color system is equal to or smaller than 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 relatively high brightness.

[0023] (18) The lens barrel according to any one of (14) to (17), wherein the first portion and the second portion have a brightness relatively higher than that of 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 name plate. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0027] Figure 3 This is a cross-sectional view schematically showing the internal structure of the interchangeable lens.

[0028] Figure 4 It is a diagram showing a schematic structure of a tilt adjustment mechanism.

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

[0030] Figure 6 yes Figure 5 Sectional view 6-6.

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

[0032] Figure 8 It is a cross-sectional view which enlarges the mounting portion of the decoration ring.

[0033] Fig. 9 It is a cross-sectional perspective view showing the structure of a main part of an interchangeable lens according to a second embodiment.

[0034] Fig.10 This is an enlarged cross-sectional view of a main portion of the interchangeable lens according to the second embodiment.

[0035] Fig.11 This is a front view showing an example of an interchangeable lens in which a first portion and a second portion are made brighter than surrounding areas.

[0036] Fig.12 It is magnified Fig.11 A magnified view of a portion of . DETAILED DESCRIPTION

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

[0038] Here, the case where the present invention is applied to an interchangeable lens of an interchangeable lens camera is described as an example. An interchangeable lens camera refers to a camera whose lens can be freely replaced. In particular, in this embodiment, the case where the present invention is applied to an interchangeable lens of a mirrorless single-lens camera is described as an example. A mirrorless single-lens camera is one of the classifications of digital cameras, and is a general term for lens-interchangeable digital cameras that use an electronic viewfinder (EVF) or a live preview monitor (a monitor provided on the back or side of the camera body) instead of an optical viewfinder of a single-lens reflex camera to confirm the form of the image.

[0039] [First embodiment]

[0040] [External structure of interchangeable lens]

[0041] Figure 1 This is a front view showing the appearance structure of the interchangeable lens. Figure 2 is a side view showing the appearance structure of the interchangeable lens. Figure 2 In the figure, the left side of the paper 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 for a mirrorless single-lens camera. In particular, Figure 1 and Figure 2 The interchangeable lens 1 shown is an interchangeable lens having a zoom function (so-called zoom lens). Figure 1 and Figure 2 The interchangeable lens 1 shown is a zoom lens having an electric zoom (also called power zoom) function. The electric zoom is a function of electrically zooming in response to a zoom operation performed by a user. Figure 1 and Figure 2 The interchangeable lens 1 shown is a lens of fixed overall length. A lens of fixed overall length refers to a lens whose overall length does not change due to zooming and focusing operations.

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

[0044] like Figure 2 As shown, the interchangeable lens 1 has a bayonet 11 at the rear end (end on the image side) 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 this embodiment, a bayonet mount is used.

[0045] like Figure 2 As shown, the interchangeable lens 1 has a focus ring 12 and a zoom ring 13 on the outer circumference of a 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 diaphragm S is constituted by, for example, a variable diaphragm and is disposed between the second lens group L2 and the third lens group L3 including a unit (diaphragm unit) SU of the diaphragm S driving mechanism.

[0056] The interchangeable lens 1 of this embodiment has a tilt adjustment function as an optical adjustment function. The tilt adjustment is performed by the first lens group L1. Specifically, the tilt adjustment is performed by tilting 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 includes a barrel main body 20 and an exterior body 80 .

[0059] The lens 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 mounted on the camera body. A bayonet mount 11 is provided at the rear end of the lens barrel body 20 .

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

[0061] The first lens group L1 is a lens located closest to the object side in the optical axis direction. The first lens group L1 is held by the first lens frame 30 and accommodated in the lens 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 lens barrel body 20 and is configured at a predetermined position of the lens barrel body 20.

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

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

[0064] The second lens group L2 is driven by a zoom motor 22. The zoom motor 22 is composed of, for example, a coreless motor. A lead screw 23 is arranged along the optical axis Z in the lens barrel body 20. The second lens frame 40 is connected to a nut 24 mounted on 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. As a result, the second lens frame 40 moves along the optical axis Z. And, as a result, 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 accommodated in the lens barrel 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 body 20 and is arranged at a predetermined position of the lens barrel body 20.

[0066] The diaphragm unit SU is attached to the third lens frame 50 and is housed in the lens barrel body 20. As described above, the diaphragm 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 accommodated in the lens barrel body 20. As described above, the fourth lens group L4 is a movable lens group. Therefore, the fourth lens frame 60 is movably arranged. The lens barrel body 20 is provided with a main shaft 25 and a secondary shaft 26 for guiding the movement of the fourth lens frame 60. Both the main shaft 25 and the secondary shaft 26 are arranged along the optical axis Z.

[0068] The fourth lens group L4 is driven by a focus motor (not shown). The focus motor is composed of, for example, a linear motor. The focus motor moves the fourth lens frame 60 directly along the main axis 25 and the secondary axis 26. Thus, 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 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 body 20 and is arranged at a predetermined position of the lens barrel body 20.

[0070] The outer body 80 is mainly composed of a front cover 81 and a rear cover 82. The front cover 81 is installed on the outer periphery of the front end of the lens barrel body 20. The inner peripheral surface of the front cover 81 is provided with a light shielding groove 81A. The rear cover 82 is installed on the rear end peripheral portion of the lens barrel body 20. The front cover 81 and the rear cover 82 installed on the lens barrel body 20 are fixed to the lens barrel body 20 by screws not shown in the figure, respectively, thereby integrating with the lens barrel body 20. In the interchangeable lens 1 of the present embodiment, the integrated object of the lens barrel body 20 and the outer body 80 is an example of the first frame.

[0071] like Figure 1 and Figure 3As shown, the front cover 81 is installed with an annular decorative ring 100 on its inner periphery. The decorative ring 100 is arranged in a manner perpendicular to the optical axis Z (including a substantially perpendicular state), and is arranged 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 observed from the object side. The decorative ring 100 functions as a nameplate, and various specifications or instructions (so-called parameters) about 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, manufacturer name, etc. is recorded. As an example, in Figure 1 , information about the lens used (ASPHERICAL LENS (aspherical lens)), information about the focal length (18-120 mm), information about the open F value (F4), and information about the filter diameter (φ72) are shown. 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 interchangeable lens 1 according to the present embodiment performs tilt adjustment by tilting the first lens frame 30 with respect to the optical axis Z of the lens barrel 10 .

[0074] like Figure 3 As 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 lens group L1 at its inner peripheral portion.

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

[0077] Figure 4 It is a diagram showing a schematic structure of a tilt adjustment mechanism. Figure 4 Equivalent to Figure 3 Sectional view 4-4.

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

[0079] Figure 5 This is an enlarged view of one of the mounting parts. Figure 6 yes Figure 5 Sectional view 6-6.

[0080] The mounting portion 33 is composed of a rectangular plate-like piece orthogonal to the optical axis, and is configured to protrude in the outer diameter direction. The mounting portion 33 is provided with a threaded mounting hole 33A for threading the first lens frame 30 to the lens barrel body 20. The threaded mounting hole 33A is composed of a through hole. In addition, the mounting portion 33 is provided with a spring engaging portion 33B. The spring engaging portion 33B is composed of a recessed portion and is arranged on the back side (end face of the rear side) of the mounting portion 33.

[0081] The first lens frame 30 is assembled to the lens barrel main body 20 by inserting the adjustment screws 91 through the threaded mounting holes 33A of the mounting portions 33 and screwing them to the lens barrel main body 20 .

[0082] Supporting parts 92 are provided at three locations on the front end of the lens barrel body 20 corresponding to the three mounting parts 33 of the first lens frame 30. The supporting parts 92 are formed of recessed parts capable of accommodating the mounting parts 33 and are 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 composed of a coil spring and is arranged along the optical axis Z. The spring 93 is held by a spring holding portion 92B provided on the support portion 92, and is thus provided on the support portion 92. The spring holding portion 92B is composed of a recessed 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 on the support portion 92.

[0084] The first lens frame 30 is assembled to the lens barrel body 20 by aligning the positions of the mounting portions 33 with the positions of the supporting portions 92 and screwing the mounting portions 33 to the supporting portions 92 with the adjusting screws 91. The screwing is performed by passing the adjusting screws 91 through the screw mounting holes 33A of the mounting portions 33 and tightening them to the screw holes 92A of the supporting portions 92.

[0085] The spring 93 of the support portion 92 of the first lens frame 30 assembled to the lens barrel body 20 engages with the spring engagement portion 33B provided on each mounting portion 33. As a result, the first lens frame 30 is independently biased forward at each mounting portion 33.

[0086] By individually screwing or loosening the adjustment screws 91 on the first lens frame 30, each mounting portion 33 is individually biased by the spring 93, and the position of each mounting portion 33 moves forward and backward independently. As a result, the inclination of the first lens frame 30 is adjusted. That is, the inclination adjustment is performed.

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

[0088] [Decorative ring installation structure]

[0089] As described above, in the interchangeable lens 1 of the present embodiment, the decorative ring 100 is mounted on the inner periphery of the front cover 81. When the lens barrel 10 is viewed 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 body 20 and the outer periphery of the first lens frame 30 can be concealed in appearance, 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 which enlarges the mounting portion of the decoration ring.

[0091] The decoration ring 100 is configured as a thin plate-like member having a circular ring shape.

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

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

[0094] The flat surface 102 constitutes the marking portion of the nameplate (refer to Figure 1 ). That is, when the decorative ring 100 is used as a nameplate, the recorded items are marked on the flat surface 102 .

[0095] The inclined surface 103 is composed of an annular convex portion 104 having a stepped inclined surface. The convex portion 104 is arranged on 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 amount of protrusion toward the front gradually increases from the outer side to the inner side in the radial direction. Therefore, in the decorative ring 100, the portion located at the most front side 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 end surface 105 on the front side of the innermost peripheral portion. In addition, in the decorative ring 100, the portion located at the most rear side (image side) in the optical axis direction is the end surface on the rear side of the decorative ring 100, which is the mounting surface 101.

[0096] A decorative ring mounting portion 81B is provided on the inner periphery of the front cover 81. The decorative ring mounting portion 81B is protrudingly provided on the inner periphery of the front cover 81 as a flange-like convex portion having a circular ring shape. In the decorative ring mounting portion 81B, a recess 81C for the decorative ring 100 to be fitted is provided on the front end face. The decorative ring 100 is embedded in the recess 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, for example, by a 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 end face on the front side of the decorative ring mounting portion 81B. In addition, the "same surface" here includes a range of surfaces that are considered to be substantially the same (so-called substantially the same surface).

[0097] When the lens barrel 10 is observed from the object side, the decorative ring 100 mounted on the front cover 81 is arranged 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 arranged on the inner side of the decorative ring 100. In the present embodiment, the decorative ring 100 is arranged in a form in which the front end portion (the end on the object side) of the first lens frame 30 is accommodated in the inner periphery of the decorative ring 100. The decorative ring 100 is arranged with a predetermined gap ε relative to 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 of the tilt adjustment, etc., and is as small as possible. Therefore, at the fitting portion (the portion where the first lens frame 30 is fitted into the inner periphery of the decorative ring 100), the decorative ring 100 and the first lens frame 30 are arranged 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, a decorative ring 100 is arranged on the outer periphery of the fixing ring 32. More specifically, the decorative ring 100 is arranged on the outer periphery of the fixing ring body 32A (a portion of the fixing ring 32 that is closer to the front side than the flange portion 32B).

[0099] The end of the front side (object side) of the fixing ring 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 to the rear gradually increases from the outer side to the inner side in the radial direction. As a result, the end face of the front side of the inner periphery of the fixing ring body 32A is composed of a stepped inclined surface 32D. And, as a result, the front end portion of the outermost peripheral portion of the fixing ring body 32A of the fixing ring 32 becomes the portion located most forward in the optical axis direction. More specifically, the end face 32E of the front side of the outermost peripheral portion of the fixing ring body 32A becomes the portion located most forward in the optical axis direction. This portion is also the portion located most forward in the first lens frame 30.

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

[0101] In relation to the first lens frame 30, the decorative ring 100 is configured to satisfy the following necessary conditions. That is, the decorative ring 100 is configured such that, in the optical axis direction, the portion (first portion) of the first lens frame 30 located most forward is located between the portion (second portion) and the portion (third portion) of the decorative ring 100 located most forward. As described above, in the optical axis direction, the portion (first portion) of the first lens frame 30 located most forward is the front end surface 32E of the outermost circumference of the fixing ring body 32A. On the other hand, in the decorative ring 100, the portion (second portion) located most forward in the optical axis direction is the front end surface 105 of the innermost circumference of the decorative ring 100. Furthermore, in the decorative ring 100, the portion (third portion) located most backward in the optical axis direction is the mounting surface 101.

[0102] Therefore, the decorative ring 100 is arranged so that the front end face 32E (first part) of the outermost peripheral part of the fixing ring body 32A is located between the front end face 105 (second part) of the innermost peripheral part and the mounting surface 101 (third part). This means that the most front-side part (first part) of the fixing ring 32 is located further back than the most front-side part (second part) of the decorative ring 100. In other words, it means that the most front-side part (first part) of the fixing ring 32 does not protrude forward from the inner peripheral part of the decorative ring 100. And, it means that the most front-side part (first part) of the fixing ring 32 is arranged within the range of the thickness t of the decorative ring 100 in the optical axis direction.

[0103] By arranging the decoration ring 100 and the first lens frame 30 so as to satisfy the above-mentioned necessary conditions, the following effects can be obtained.

[0104] The interchangeable lens 1 of this embodiment has a tilt adjustment function as an optical adjustment function. The tilt adjustment is performed by adjusting the tilt of the first lens group L1. In addition, the tilt of the first lens group L1 is adjusted by the first lens frame 30. That is, the tilt of the first lens group L1 is adjusted by tilting the first lens frame 30 relative to the lens barrel body 20.

[0105] The first lens frame 30 is the lens frame located most forward in the optical axis direction and is visually recognizable from the outside. Therefore, if the lens frame is visually recognizable as tilted, the quality of the appearance will be impaired. In addition, there is a risk of being mistakenly identified as a defective product.

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

[0107] The first lens frame 30 and the decorative ring 100 are radially adjacent at their fitting portion, so if the front end portion of the first lens frame 30 is tilted in a state of protruding from the decorative ring 100, the tilt becomes obvious and is easily visually recognized in appearance. In particular, as in the interchangeable lens 1 of the present embodiment, in the case where the portion (end face 105) of the decorative ring 100 located most forward and the portion (end face 32E) of the first lens frame 30 located most forward are radially adjacent, if the portion (end face 32E) of the first lens frame 30 located most forward is tilted in a state of protruding from the decorative ring 100, the tilt becomes obvious and is easily visually recognized in appearance.

[0108] However, as in the interchangeable lens 1 of the present embodiment, if the front end portion of the first lens frame 30 is retracted from the front end of the decorative ring 100 to the inner side (image side), even when the first lens frame 30 is tilted, the tilt can be made difficult to be visually recognized. That is, in the case of the interchangeable lens 1 of the present embodiment, since the portion to be visually recognized in the first lens frame 30 is substantially limited to the portion to be visually recognized from the front, the tilt can be made difficult to be visually recognized.

[0109] Thus, according to the interchangeable lens 1 of the present embodiment, even when the first lens frame 30 is installed tilted by tilt adjustment, the tilt can be made difficult to be visually recognized from the appearance. Thus, the appearance quality of the interchangeable lens 1 can be improved. In particular, in a structure having a first portion adjacent to the inner circumference of the decorative ring 100 and a structure in which the first portion and the second portion are arranged adjacent to each other in the radial direction, as in the interchangeable lens 1 of the present embodiment, the tilt of the first lens frame 30 can be made difficult to be visually recognized, thereby improving the appearance quality.

[0110] In addition, the effect of making the inclination of the first lens frame 30 difficult to be visually recognized is achieved by configuring the portion (first portion) of the first lens frame 30 located at the most front side position to the rear side than the portion (second portion) of the decorative ring 100 located at the most front side position. In order to maintain the relationship that the first portion is always configured at a position more rearward than the second portion even when the inclination adjustment is performed, it is necessary to make the first portion be located at a position retreated to the rear side by a distance δ or more than the second portion in the unadjusted state. The distance δ is set according to the displacement of the first portion in the optical axis direction caused by the inclination adjustment. Specifically, it is set to a value that exceeds the maximum displacement of the first portion in the optical axis direction caused by the inclination adjustment. In addition, the "maximum displacement" here means the displacement of the first portion when the adjustment is made with the maximum adjustment amount from the unadjusted state. Therefore, for example, when the displacement of the first portion when the inclination adjustment is made with the maximum adjustment amount from the unadjusted state is 0.3 mm, the distance δ is set to a value exceeding 0.3 mm. For example, it is set to δ=0.5 mm. Thus, even when the tilt adjustment is performed, the first portion is always arranged at a position more than a certain distance behind the second portion. That is, regardless of whether the tilt adjustment is performed, the first lens frame 30 is always maintained in a state where it does not protrude from the decorative ring 100.

[0111] In addition, it is preferred that, when the tilt adjustment of the first lens frame 30 is performed with a maximum adjustment amount, the first portion is set at a position that is retreated to the rear side by a distance ξ or more compared to the second portion. As an example, the distance ξ is ξ=0.3 mm. That is, when the tilt adjustment of the first lens frame 30 is performed with a maximum adjustment amount, the first portion is set at a position that is retreated to the rear side by a distance ξ or more compared to the second portion. Thus, the inclination of the first lens frame 30 caused by the tilt adjustment can be made less noticeable, and 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 composed of stepped inclined surfaces, the inclination of the first lens frame 30 can be made less noticeable, and the appearance quality can be improved.

[0112] In addition, if the first lens frame 30 is excessively retreated to the rear side relative to the decorative ring 100, dark corners may be generated. In addition, the appearance may be damaged. In particular, if the retreat exceeds the thickness t of the decorative ring 100, the gap can be visually recognized, thereby reducing the appearance quality. Therefore, it is preferably set so that the portion of the first lens frame 30 located at the most front side (the first portion) is located more forward than the portion of the decorative ring 100 located at the most rear side (the third portion).

[0113] [Second embodiment]

[0114] Fig. 9 2 is a cross-sectional perspective view showing the structure of the main part of the interchangeable lens according to the second embodiment. Fig.10 This is an enlarged cross-sectional view of a main portion of the interchangeable lens according to the second embodiment.

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

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

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

[0118] Furthermore, in the interchangeable lens 1 of the present embodiment, the innermost circumference of the convex portion 104 is a portion located most forward (object side) in the optical axis direction in the decorative ring 100. More specifically, the front end surface 108 of the innermost circumference of the convex portion 104 is a portion (second portion) located most forward in the optical axis direction in the decorative ring 100. In the decorative ring 100 of the present embodiment, the front end surface 108 of the innermost circumference of the convex portion 104 is a portion adjacent to the concave portion 106 in the radial direction.

[0119] Similar to the interchangeable lens 1 of the first embodiment, the decorative ring 100 is arranged so as to satisfy the following necessary conditions in relation to the first lens frame 30. That is, the decorative ring 100 is arranged so that the portion (first portion) of the first lens frame 30 located most forward is located between the portion (second portion) of the decorative ring 100 located most forward and the portion (third portion) located most backward.

[0120] Furthermore, in the present embodiment, the decorative ring 100 and the first lens frame 30 are arranged in a manner that satisfies the following necessary conditions. That is, the first portion of the first lens frame 30 is arranged so that, when viewed from the front side (object side), the first portion is located closer to the front side (object side) than the fourth portion of the recessed portion 106 that is located closest to the rear side (image side).

[0121] As described above, the portion (the fourth portion) of the recess 106 of the decorative ring 100 located most rearward is the bottom surface of the recess 106. Therefore, the first lens frame 30 is configured such that the portion (the first portion) located most forward is located more forward (object side) than the bottom surface 107 (the fourth portion) of the recess 106.

[0122] Thus, in the interchangeable lens 1 of the present embodiment, the innermost circumference of the decorative ring 100 (the portion adjacent to the outer circumference of the first lens frame 30 in the radial direction) is arranged further rearward (image side) than the portion (first portion) located most forward of the first lens frame 30. In this structure, as in 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 (radial width) of the recess 106 is too wide, the inclination will become noticeable when the inclination is adjusted. Sometimes it will also damage the design of the appearance. Therefore, it is preferably set to an appropriate width. For example, it can be set to a width that is the same as or the same degree as the width of the step portion in the stepped inclined surface 103. As an example, it can be set to a width of about 0.4 mm.

[0124] Furthermore, it is also preferable that the depth of the recessed portion 106 is set to an appropriate depth. As an example, the depth can be set to about 0.8 mm.

[0125] [Other embodiments]

[0126] [color]

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

[0128] In addition, the meaning of "same color" refers to a color combination that is difficult for humans to distinguish. This combination can be obtained empirically, for example, it can be determined based on theories such as the theory of confusing color lines.

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

[0130] Furthermore, for the same reason, the colors of the decorative ring 100 and the first lens frame 30 preferably have a chromaticity of a Munsell chromaticity value that is less than a threshold value. In other words, the chromaticity is preferably low. Therefore, achromatic colors are preferred.

[0131] Furthermore, the decorative ring 100 and the first lens frame 30 preferably have a lightness of a Munsell chromaticity value that is less than a threshold value. In other words, they preferably have a low lightness. Therefore, they are preferably black.

[0132] Based on the above, it is preferable that the decoration ring 100 and the first lens frame 30 are made of the same color, and both are black.

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

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

[0135] Fig.11 This is a front view showing an example of an interchangeable lens in which the first portion and the second portion are made brighter than the surrounding area. Fig.12 It is magnified Fig.11 A magnified view of a portion of Fig.11 ).

[0136] like Fig.11 and Fig.12 As shown, the brightness of the front end portion of the outermost circumference of the fixing ring body 32A as the first part and the front end portion of the innermost circumference of the decorative ring 100 as the second part is relatively higher than that of other parts. Fig.11 and Fig.12 In the embodiment, as shown by cross hatching, the lightness of the front end face 32E (first part) of the outermost peripheral part of the fixing ring body 32A and the front end face 105 (second part) of the innermost peripheral part of the decorative ring 100 is made relatively higher than that of other parts. As an example, the lightness in the Munsell color system is increased by three or more stages.

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

[0138] In addition, a method of relatively increasing brightness by making the surface roughness of the region smaller than that of other regions may be adopted. In other words, a method of relatively increasing brightness by increasing the reflectivity of the first and second portions to be higher than the entire portion may be adopted.

[0139] In addition, the effect of making the inclination of the first lens frame 30 less noticeable is mainly produced 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 have a brightness higher than the surface constituting the gap. Therefore, for example, with respect to the first lens frame 30, at least the end face 32E (first part) on the front side of the outermost peripheral part of the fixing ring body 32A has a brightness relatively higher than the outer peripheral surface of the fixing ring body 32A. And, with respect to the decorative ring 100, at least the end face 105 (second part) on the front side of the innermost peripheral part has a brightness relatively higher than the inner peripheral surface of the decorative ring 100. Therefore, for example, by reducing the brightness of the outer peripheral surface of the fixing ring body 32A to be relatively lower than the brightness of the end face 32E and reducing the brightness of the inner peripheral surface of the decorative ring 100 to be relatively lower than the brightness of the end face 105, the same effect can be obtained. In order to reduce the brightness of the outer peripheral surface of the fixing ring body 32A to be lower than the brightness of the end surface 32E, for example, a method of coating the outer peripheral surface of the fixing ring body 32A with a paint 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 fixing ring body 32A greater than the surface roughness of the end surface 32E (reducing the reflectivity) 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 the brightness of the end surface 105, for example, a method of coating the inner peripheral surface of the decorative ring 100 with a paint 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 greater than the surface roughness of the end surface 105 (reducing the reflectivity) can be adopted.

[0140] [Decorative ring]

[0141] The decorative ring 100 of the above embodiment has a structure having the annular convex portion 104 on the inner peripheral portion of the end surface on the front side (object side), but may also be a flat structure.

[0142] Furthermore, in the decorative ring 100 of the above embodiment, the convex portion 104 has a stepped shape in which the diameter gradually decreases toward the front, but may also have a tapered shape in which the diameter continuously decreases toward the front.

[0143] The same applies to the first lens frame 30. That is, the front end of the fixing ring body 32A may be formed into a tapered shape whose diameter continuously decreases toward the rear side.

[0144] Furthermore, although the decorative ring 100 of the above-mentioned embodiment is used as a nameplate, it may not be marked with anything, or other information (information other than specifications or instructions) may be displayed.

[0145] Furthermore, the decorative ring 100 of the above embodiment adopts a completely closed circle, but may also be a partially open shape. The shapes of the frames in the first frame, the second frame, and the third frame are also the same, and are not limited to a completely closed shape in the circumferential direction, but include a partially open shape.

[0146] [Optical adjustment function]

[0147] In the above-mentioned embodiment, the case where the present invention is applied to an interchangeable lens having a tilt adjustment function as an optical adjustment function is described as an example, but the example of the optical adjustment function is not limited to this. In addition, for example, the present invention can also be similarly applied to an interchangeable lens having an interaxial distance adjustment function instead of the tilt adjustment function or in addition to the tilt adjustment function. The interaxial distance adjustment is performed, for example, by moving the lens group as the adjustment object forward and backward along the optical axis. In the case where the interaxial distance adjustment is performed by the first group of lenses L1, the first lens frame 30 is moved forward and backward along the optical axis. That is, the lens barrel body 20 is relatively changed in position along the optical axis Z. In addition, the interchangeable lens 1 described in the above-mentioned embodiment can also be adjusted for interaxial distance. That is, the three mounting portions 33 of the first lens frame 30 are respectively moved with the same displacement amount. Thus, the first lens frame 30 moves forward and backward along the optical axis while maintaining the same posture.

[0148] [other]

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

[0150] Furthermore, in the above-mentioned embodiment, the present invention is described by taking the case where the present invention is applied to the interchangeable lens of the lens-interchangeable camera as an example, but the application of the present invention is not limited to this. It can also be applied to the lens barrel of the lens provided in the lens-integrated camera. Furthermore, it can also be applied to the lens barrel of optical equipment other than the camera. In addition, in addition to the so-called still camera, the camera also includes various cameras such as a video camera, a television camera, and a movie camera.

[0151] Explanation of symbols

[0152] 1-interchangeable lens, 10-lens barrel, 11-bayonet, 12-focusing ring, 13-zoom ring, 20-barrel body, 21-guide shaft, 22-zoom motor, 23-lead screw, 24-nut, 25-main shaft, 26-secondary shaft, 30-first lens frame, 31-first lens frame body, 31A-internal thread portion, 32-fixing ring, 32A-fixing ring body, 32B-flange portion, 32C-external thread portion, 32D-inclined surface, 32E-end surface, 33-mounting portion, 33A-threaded mounting hole, 33B-spring engaging portion, 40-second lens frame, 50-third lens frame, 60-fourth lens frame, 70-fifth Lens frame, 80-external body, 81-front cover, 81A-light-shielding groove, 81B-decorative ring mounting part, 81C-recess, 82-rear cover, 91-adjustment screw, 92-support part, 92A-threaded hole, 92B-spring retaining part, 93-spring, 100-decorative ring, 101-mounting surface, 102-flat surface, 103-inclined surface, 104-convex part, 105-end surface, 106-recess, 107-bottom surface, 108-end surface, L1-first group of lenses, L2-second group of lenses, L3-third group of lenses, L4-fourth group of lenses, L5-fifth group of lenses, S-aperture, SU-aperture unit, W-rectangular area, Z-optical axis.

Claims

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

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

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

4. The lens barrel according to claim 1, wherein: When the position and / or the inclination of the second frame is adjusted by the maximum adjustment amount, the first portion is located at a position that is retreated toward the image side by a distance ξ or more than 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 recessed portion at the inner peripheral portion. The first portion is located closer to the object side than a fourth portion of the concave portion located closest to the image side.

7. The lens barrel according to claim 1, wherein: The third frame has an annular convex portion on the inner peripheral portion of the end surface on the object side.

8. The lens barrel according to claim 7, wherein: The convex portion of the third frame has a tapered shape whose diameter decreases toward the object side.

9. The lens barrel according to claim 8, wherein: The object-side end of the second frame has a tapered shape whose diameter decreases toward the image side.

10. The lens barrel according to claim 7, wherein: The convex portion of the third frame has a stepped shape in which a diameter gradually decreases 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 in which the diameter gradually decreases toward the image side.

12. The lens barrel according to claim 1, wherein: The second frame has the first portion at a portion adjacent to an inner periphery of the third frame when viewed from the object side.

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 chromaticity values ​​of the first part and the second part is less than a threshold value.

16. The lens barrel according to claim 14, wherein: The hue difference between the first portion and the second portion in the hue circle of the Munsell color system is less than a threshold value.

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

18. The lens barrel according to claim 14, wherein: The first portion and the second portion have relatively higher brightness 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