Lens barrel and shooting device

Abstract

In order to achieve silent operation of the lens barrel, the lens barrel includes: a plurality of aperture blades; a driving unit for driving the plurality of aperture blades; a first opening member for holding the driving unit; a second opening member including a plurality of relative portions, which are opposite to the first opening member in the direction of the optical axis; and a plurality of buffer members, respectively arranged between the first opening member and the plurality of relative portions, the plurality of buffer members for positioning the first opening member relative to the second opening member.

Description

Technical Field

[0001] The invention relates to a lens barrel and a shooting device. Background Art

[0002] A lens barrel is provided with an aperture device (see, for example, Patent Document 1). There is a demand for quieter lens barrels.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 4-128727 Summary of the Invention

[0006] According to the first method, the lens barrel comprises: a plurality of aperture blades; a driving unit for driving the plurality of aperture blades; a first opening member for holding the driving unit; a second opening member including a plurality of relative portions, the plurality of relative portions being opposite to the first opening member in the direction of the optical axis; and a plurality of buffer members, respectively arranged between the first opening member and the plurality of relative portions, the plurality of buffer members performing positioning of the first opening member relative to the second opening member.

[0007] According to a second aspect, an imaging device includes the above-mentioned lens barrel and an imaging element.

[0008] In addition, the structure of the embodiment described later may be appropriately improved, or at least a portion thereof may be replaced by another component. Furthermore, the components whose configuration is not particularly limited are not limited to the configuration disclosed in the embodiment and may be configured at a position where their function can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A diagram showing a camera including a lens barrel and a camera body according to one embodiment.

[0010] Figure 2 This is a perspective view showing a state where the aperture device according to one embodiment is attached to the fixed cylinder.

[0011] Figure 3 yes Figure 2 Exploded three-dimensional diagram.

[0012] Figure 4 It will Figure 1 The enlarged cross-sectional view of the portion surrounded by the dotted line is shown in FIG.

[0013] Figure 5 (A) is a view of the fixed barrel from the subject side. Figure 5 (B) is a three-dimensional diagram of the fixed cylinder.

[0014] Figure 6 (A) is a diagram showing the aperture mechanism as viewed from the camera body side. Figure 6 (B) is a three-dimensional diagram of the aperture device.

[0015] Figure 7 (A) is a top view showing the relationship between the aperture device and the buffer member. Figure 7 (B) is a perspective view showing the relationship between the aperture device and the buffer member. DETAILED DESCRIPTION

[0016] Hereinafter, with reference to the accompanying drawings, a lens barrel according to one embodiment will be described. In addition, in the figures shown below, an XYZ orthogonal coordinate system is appropriately set for ease of description and understanding. In this coordinate system, the camera position (hereinafter referred to as the normal position) when the photographer takes a horizontally long image with the optical axis OA as the horizontal direction, is the direction from the subject toward the camera body 10 side as the +X direction. In addition, the direction toward the right side in the normal position is set as the +Y direction. In addition, the direction toward the upper side in the normal position is set as the +Z direction. In addition, the shape, length, thickness and other scales of the various parts shown in the embodiment may not be consistent with the actual object. In addition, parts that do not need to be explained are appropriately omitted or simplified.

[0017] Figure 1 1 is a schematic diagram of a camera 1 including a lens barrel 20 according to this embodiment. The camera 1 includes a camera body 10 and a lens barrel 20 that is attachable to and detachable from the camera body 10. The lens barrel 20 and the camera body 10 may be integral.

[0018] The lens barrel 20 includes: a lens 21 as an optical component that refracts incident subject light to form a subject image on the exit side; and an aperture device 30 that adjusts the aperture size of the lens 21. The aperture device 30 is attached to the fixed barrel 22 via a buffer member 40 by a screw 41. Figure 1 In FIG, the lens 21 is depicted as a single lens, but it may be composed of a plurality of lenses. Figure 1 , only one lens group is depicted, but a plurality of lens groups may be provided. The plurality of lens groups may be arranged on the camera body 10 side relative to the aperture device 30 , or may be arranged on both the subject side and the camera body 10 side relative to the aperture device 30 .

[0019] The camera body 10 includes an image sensor 12 that captures a subject image formed by a lens 21 and converts the image into an electrical signal.

[0020] Next, the structure of the aperture device 30 in this embodiment will be described. Figure 2 1 is a perspective view showing a state where the aperture device 30 according to one embodiment is mounted on the fixed cylinder 22. Figure 3 yes Figure 2 Exploded three-dimensional diagram.

[0021] like Figure 2 As shown, in this embodiment, the aperture device 30 is disposed within the fixed cylinder 22, and the aperture device 30 and the fixed cylinder 22 do not contact each other in the radial direction. Specifically, a clearance (gap) is provided along the entire circumference between the inner wall of the fixed cylinder 22 and the outer peripheral surface of the aperture device 30 (more specifically, the opening member 31 described later). Furthermore, a gap also exists between the aperture device 30 and the fixed cylinder 22 in the direction of the optical axis OA, and they do not contact each other.

[0022] like Figure 3 As shown, the aperture device 30 is an iris diaphragm device, which includes an opening member 31, a rotating member 32, and a plurality of aperture blades 33 (in Figure 3 Only one piece is shown in the figure), the cam plate 34 and the stepping motor 35.

[0023] The opening member 31 is an annular member comprising a main body 313 and a first protrusion 312a, a second protrusion 312b, and a third protrusion 312c that protrude from the main body 313 in a direction intersecting the optical axis OA. The main body 313 has a centrally located mating opening 311. A stepping motor 35 is mounted on the +X side of the main body 313. Details of the first protrusion 312a, the second protrusion 312b, and the third protrusion 312c will be described later.

[0024] The rotating member 32 is an annular member having an annular protrusion 321 at its center that fits into the fitting opening 311 of the opening member 31. A sector gear 322 is formed on the outer edge of the rotating member 32 and meshes with a pinion (not shown) mounted on the rotating shaft of the stepping motor 35.

[0025] A support portion 331 is provided on the +X side of the plurality of aperture blades 33, and a cam follower 332 is provided on the -X side. The support portion 331 is inserted into a hole (not shown) provided on the -X side of the rotating member 32, and the cam follower 332 is inserted into a cam 341 provided on the cam plate 34.

[0026] When the instruction to change the F value is given, the stepping motor 35 is driven to rotate, and the rotating member 32 having the sector gear 322 rotates, and the sector gear 322 meshes with the pinion gear mounted on the rotating shaft of the stepping motor 35. Since the support portion 331 of the aperture blade 33 is inserted into the hole formed on the -X side of the rotating member 32, if the rotating member 32 rotates around the optical axis, the aperture blade 33 also rotates around the optical axis. Since the cam follower 332 of the aperture blade 33 is inserted into the cam 341 of the cam plate 34, the cam follower 332 of the aperture blade 33 rotates along the cam 341 with the support portion 331 as the fulcrum. In addition, when the focal length is changed, the cam plate 34 is rotated by a mechanical mechanism not shown in the figure, and the cam follower 332 of the aperture blade 33 rotates along the cam 341 with the support portion 331 as the fulcrum. In this way, the opening 37 of the iris diaphragm can be adjusted by a plurality of aperture blades 33 (see Figure 1 ) size.

[0027] The diaphragm device 30 configured in this manner is attached to the fixed cylinder 22 using the first protrusion 312 a , the second protrusion 312 b , and the third protrusion 312 c of the opening member 31 .

[0028] Figure 4 It will be Figure 1 The enlarged cross-sectional view of the part surrounded by the dotted line. Figure 4 As shown, the fixed cylinder 22 has a first opposing portion 223a, a second opposing portion 223b, and a third opposing portion 223c at positions opposing the first protrusion 312a, the second protrusion 312b, and the third protrusion 312c, respectively, in the direction of the optical axis OA. In the following description, the first opposing portion 223a, the second opposing portion 223b, and the third opposing portion 223c are referred to as the opposing portion 223 unless otherwise specified.

[0029] The diaphragm device 30 is attached to the fixed cylinder 22 by screws 41 or the like, with annular buffer members 40 interposed between the first protrusion 312 a , the second protrusion 312 b , and the third protrusion 312 c of the aperture member 31 and the plurality of facing portions 223 of the fixed cylinder 22 .

[0030] To achieve a quieter lens barrel 20, it is desirable to minimize the transmission of vibrations generated by the driving of the aperture blades 33 to the fixed barrel 22. For example, one possible solution is to make the buffer member 40 out of rubber. However, if the buffer member 40 is made of rubber, it easily deforms, making the position of the aperture device 30 relative to the fixed barrel 22 uncertain, both in the direction of the optical axis OA (X direction) and in the plane directions perpendicular to the optical axis (Y and Z directions). In other words, the buffer member 40 cannot be used to position the aperture device 30. Therefore, a structure is required to position the aperture device 30 at a predetermined position relative to the fixed barrel 22. For example, for positioning in the X direction, abutting contact surfaces can be provided on the aperture member 31 and the fixed barrel 22, and these abutting contact surfaces can be brought into contact with each other for positioning. Alternatively, for positioning in the Y and Z directions, positioning bosses (protrusions) are provided on the opening member 31 of the diaphragm unit 30, and holes are provided in the fixed barrel 22 for receiving the bosses. Positioning is achieved by fitting the bosses into the holes. However, in this case, since the diaphragm unit 30 is in contact with the fixed barrel 22, the vibrations generated by driving the diaphragm blades 33 are directly transmitted from the diaphragm unit 30 to the fixed barrel 22, potentially resulting in insufficient silencing of the lens barrel 20.

[0031] Therefore, in this embodiment, the buffer member 40 is made of engineering plastic or super engineering plastic.

[0032] Here, engineering plastics refer to plastics that have heat resistance of 100°C or higher, a tensile strength of 49.0 MPa or higher, and a flexural modulus of 2.4 GPa or higher. Examples of engineering plastics include polyacetal (POM), polycarbonate (PC), modified polyphenylene ether (m-PPE), polyamide (PA), and polybutylene terephthalate (PBT).

[0033] Super engineering plastics are plastics that meet the requirements of engineering plastics and have a heat resistance of 150°C or higher. Examples of super engineering plastics include polyphthalamide (PPA), polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polysulfone (PSU), polyethersulfone (PES), polyetherimide (PEI), polyamideimide (PAI), polyetheretherketone (PEEK), and polytetrafluoroethylene (PTFE).

[0034] The buffer member 40, made of engineering plastic or super engineering plastic, is resistant to deformation. Specifically, the outer dimensions (thickness in the direction of the optical axis OA and size perpendicular to the optical axis) of the buffer member 40 before assembly with the lens barrel 20 are substantially identical to those after assembly with the lens barrel 20 (after the aperture device 30 is secured to the fixed barrel 22). Furthermore, after the aperture device 30 is secured to the fixed barrel 22, the buffer member 40 is less susceptible to deformation due to shock or vibration. Therefore, by sandwiching the buffer member 40 of this embodiment between the aperture device 30 and the fixed barrel 22, the position of the aperture device 30 relative to the fixed barrel 22 in the direction of the optical axis OA can be positioned at a predetermined position (designed position). In other words, the buffer member 40 functions as a positioning member for the aperture device 30 relative to the fixed barrel 22 in the direction of the optical axis OA. Furthermore, the buffer member 40 also functions as a spacer, preventing the fixed barrel 22 from contacting the aperture device 30 in the direction of the optical axis OA.

[0035] Next, the positioning of the aperture device 30 on a plane perpendicular to the optical axis OA of the lens barrel 20 will be described.

[0036] Figure 5 (A) is a diagram showing the fixed tube 22 as viewed from the subject side. Figure 5 (B) is a perspective view of the fixed cylinder 22. Figure 6 (A) is a diagram showing the aperture device 30 as viewed from the camera body 10 side. Figure 6 (B) is a perspective view of the aperture device 30. In addition, Figure 7 (A) is a plan view showing the relationship between the aperture device 30 and the buffer member 40. Figure 7 (B) is a perspective view showing the relationship between the aperture device 30 and the buffer member 40 .

[0037] like Figure 5 (A) and Figure 5 As shown in (B), on the fixed cylinder 22, a fitting portion 224 for fitting with the buffer member 40 is formed on the first relative portion 223a, the second relative portion 223b, and the third relative portion 223c, which are respectively opposite to the first protrusion 312a, the second protrusion 312b, and the third protrusion 312c in the direction of the optical axis OA. The fitting portion 224 has a wall portion 225 that extends in the direction of the optical axis OA and fits with at least a portion of the outer periphery of the buffer member 40. In addition, the fitting portion 224 has a contact surface 226 that abuts the buffer member 40 in the direction of the optical axis OA. The wall portion 225 fixes the position of the buffer member 40 relative to the fixed cylinder 22 on a plane perpendicular to the optical axis OA. In addition, the contact surface 226 fixes the position of the buffer member 40 relative to the fixed cylinder 22 in the direction of the optical axis OA.

[0038] On the other hand, on the aperture device 30, as shown in FIG. Figure 6 (A) and Figure 6 As shown in FIG. 3B , the first protrusion 312 a of the opening member 31 is provided with a fitting portion 315 that fits with the buffer member 40 . Figure 7 (A) and Figure 7 As shown in FIG. 3B , the engaging portion 315 includes a wall portion 316a extending along the optical axis OA and engaging with at least a portion of the outer periphery of the buffer member 40. Furthermore, the engaging portion 315 includes a contact surface 317a that abuts the buffer member 40 in the direction of the optical axis OA. The wall portion 316a secures the position of the buffer member 40 relative to the opening member 31 in a plane perpendicular to the optical axis OA, while the contact surface 317a secures the position of the buffer member 40 relative to the opening member 31 in the direction of the optical axis OA.

[0039] Therefore, if the buffer member 40 is arranged in the fitting portion 315 of the first protrusion 312a and the fitting portion 224 of the first opposing portion 223a of the fixed cylinder 22, the position of the aperture device 30 relative to the fixed cylinder 22 on a plane perpendicular to the optical axis OA can be positioned at a predetermined position (design position) in directions other than the direction in which the opening member 31 rotates with the first protrusion 312a as a fulcrum.

[0040] like Figure 7 (A) and Figure 7 As shown in FIG. 3 (B), a wall portion 316b is formed on the second protrusion 312b. The wall portion 316b extends in the optical axis OA direction and contacts the outer periphery of the buffer member 40 in the circumferential direction of a circle centered on the optical axis OA. Figure 6 (A) and Figure 6 As shown in (B), a contact surface 317b is formed to abut against the buffer member 40 in the direction of the optical axis OA. The wall portion 316b fixes the position of the buffer member 40 in the circumferential direction of the circle centered on the optical axis OA relative to the opening member 31, and the contact surface 317b also fixes the position of the buffer member 40 in the direction of the optical axis OA relative to the opening member 31.

[0041] When the buffer member 40 is positioned within the mating portion 224 between the second protrusion 312b and the second opposing portion 223b of the fixed cylinder 22, the circumferential movement of the opening member 31 relative to the fixed cylinder 22 about the optical axis OA is restricted by the wall portion 316b. Specifically, the movement of the opening member 31 in the direction of rotation of the opening member 31 about the first protrusion 312a is restricted by the wall portion 316b and the buffer member 40. Thus, the buffer member 40, the wall portions 316a, and the wall portions 316b enable positioning of the aperture device 30 in a plane perpendicular to the optical axis OA.

[0042] On the other hand, the third protrusion 312c does not have the wall portion 316a or the wall portion 316b that contacts the outer periphery of the buffer member 40. In other words, the third protrusion 312c does not have a wall portion extending in the direction of the optical axis OA. This is to avoid excessive restraint of the aperture device 30. In addition, as Figure 6 (A) and Figure 6 As shown in FIG. 2B , the third protrusion 312c has a contact surface 317c formed thereon for contacting the buffer member 40 in the direction of the optical axis OA. When the buffer member 40 is positioned in the engaging portion 224 between the third protrusion 312c and the third opposing portion 223c of the fixed cylinder 22, the contact surface 317c secures the position of the opening member 31 relative to the fixed cylinder 22 in the direction of the optical axis OA.

[0043] By constructing the first protrusion 312, the second protrusion 312b and the third protrusion 312c in this way, even without providing a positioning boss (protrusion) or a hole for inserting the boss, the buffer member 40 can be used to position the aperture device 30 relative to the fixed cylinder 22 on a plane perpendicular to the optical axis OA.

[0044] Thus, in this embodiment, since the position of the diaphragm device 30 in the direction of the optical axis OA and in a plane perpendicular to the optical axis OA can be positioned at a predetermined position using the cushioning member 40, whose outer dimensions do not readily change, there is no need to provide a separate positioning structure (abutment surface, boss) on the diaphragm device 30 and the fixed cylinder 22. Since no positioning structure (abutment surface, boss) is provided, the diaphragm device 30 does not contact the fixed cylinder 22.

[0045] As described above, a gap is provided throughout the entire circumference between the inner wall of the fixed barrel 22 and the outer peripheral surface of the aperture mechanism 30 (opening member 31). Furthermore, because no positioning mechanism is provided due to the structures of the buffer member 40, the first protrusion 312a, the second protrusion 312b, the third protrusion 312c, and the fitting portion 224, the fixed barrel 22 does not contact the aperture mechanism 30 in the direction of the optical axis OA or in a plane perpendicular to the optical axis OA. Consequently, the aperture mechanism 30 (opening member 31) does not contact the fixed barrel 22. As a result, vibrations generated by the driving of the aperture blades 33 are not directly transmitted from the aperture mechanism 30 to the fixed barrel 22, thereby achieving a quieter lens barrel 20.

[0046] Furthermore, in this embodiment, the material of the buffer member 40 is a material having a lower vibration transmission coefficient than the material of the fixed barrel 22, among the aforementioned engineering plastics and super engineering plastics. Thus, the buffer member 40 absorbs the vibration generated by the driving of the aperture blades 33 and can suppress the transmission of this vibration to the fixed barrel 22, thereby further reducing the noise level of the lens barrel 20.

[0047] Furthermore, in this embodiment, Figure 6 (A)~ Figure 7 As shown in FIG. 3 (B), the main body 313 of the opening member 31 has a circumferentially extending slit 314 at a position radially opposed to the first protrusion 312a, the second protrusion 312b, and the third protrusion 312c. As a result, for example, the portion between the first protrusion 312a, the second protrusion 312b, and the third protrusion 312c and the slit 314 functions like a leaf spring to absorb vibration, thereby further suppressing the transmission of vibration to the fixed cylinder 22 and achieving further silencing of the lens barrel 20.

[0048] As described in detail above, according to this embodiment, the lens barrel 20 includes: a plurality of aperture blades 33; a stepping motor 35 for driving the plurality of aperture blades 33; an aperture member 31 that holds the stepping motor 35; a fixed barrel 22 including a plurality of opposing portions 223 that oppose the aperture member 31 in the direction of the optical axis OA; and a plurality of buffer members 40 disposed between the aperture member 31 and the plurality of opposing portions 223. The buffer members 40 position the aperture member 31 relative to the fixed barrel 22. The buffer members 40 enable positioning of the aperture member 31 relative to the fixed barrel 22 without direct contact between the aperture member 31 and the fixed barrel 22. This prevents vibration generated by the driving of the aperture blades 33 from being transmitted to the fixed barrel 22, resulting in a quieter lens barrel 20. Furthermore, the motor for driving the aperture blades is not limited to a stepping motor; a DC motor, ultrasonic motor, or the like may also be used.

[0049] In addition, in this embodiment, the opening member 31 does not contact the fixed cylinder 22. Therefore, since the vibration generated by the driving of the aperture blades 33 is not directly transmitted to the fixed cylinder 22, the lens barrel 20 can be made silent.

[0050] Furthermore, in this embodiment, the outer dimensions of each of the plurality of buffer members 40 before assembly with the lens barrel 20 are substantially the same as the outer dimensions after assembly with the lens barrel 20. Since the outer dimensions of the buffer members 40 are substantially the same before and after assembly with the lens barrel 20, the buffer members 40 can be used to position the aperture device 30.

[0051] Furthermore, in this embodiment, the plurality of buffer members 40 have a lower vibration transmission rate than the members of the fixed barrel 22. Thus, the buffer members 40 absorb vibrations generated by driving the aperture blades 33, thereby suppressing the transmission of vibrations to the fixed barrel 22, thereby further reducing the noise level of the lens barrel 20.

[0052] Furthermore, in this embodiment, the opening member 31 includes a fitting portion 315 that fits with the buffer member 40 at a position facing the first opposing portion 223a of the plurality of opposing portions 223 in the direction of the optical axis OA. Thus, when assembling the lens barrel 20, the aperture device 30 can be positioned on a plane perpendicular to the optical axis OA in directions other than the direction in which the opening member 31 rotates about the buffer member 40 fitted in the fitting portion 315.

[0053] In this embodiment, the fitting portion 315 includes a wall portion 316a extending along the optical axis and fitting with at least a portion of the buffer member 40. This prevents the opening member 31 from moving relative to the fixed cylinder 22 in the circumferential and radial directions of a circle centered on the optical axis OA.

[0054] Furthermore, in this embodiment, the opening member 31 includes a wall portion 316b that contacts at least a portion of the buffer member 40 at a position in the direction of the optical axis OA that opposes the second opposing portion 223b of the plurality of opposing portions 223. Thus, the movement of the opening member 31 in the direction in which the opening member 31 rotates about the buffer member 40 engaged with the engagement portion 315 is restricted by the wall portion 316b and the buffer member 40, thereby enabling positioning of the aperture device 30 on a plane perpendicular to the optical axis OA.

[0055] In this embodiment, the wall portion 316b extends along the optical axis OA and contacts the buffer member 40 in the circumferential direction of a circle centered on the optical axis OA. Thus, the movement of the opening member 31 in the direction in which the opening member 31 rotates about the first protrusion 312a is restricted by the wall portion 316b and the buffer member 40.

[0056] In this embodiment, the opening member 31 does not have a wall portion extending in the optical axis OA direction at a position facing the third facing portion 223 c among the plurality of facing portions.

[0057] In addition, in this embodiment, the plurality of facing portions 223 are fitted with the buffer member 40. This allows the position of the buffer member 40 relative to the fixed cylinder 22 to be fixed in a plane perpendicular to the optical axis OA and in the direction of the optical axis OA.

[0058] In this embodiment, the opening member 31 includes a main body 313, and first, second, and third protrusions 312a, 312b, and 312c that protrude from the main body 313 in a direction intersecting the optical axis OA and that oppose the plurality of opposing portions 223. The main body 313 includes circumferentially extending slits 314 at positions radially opposing the first, second, and third protrusions 312a, 312b, and 312c. This prevents vibrations of the main body 313 from being transmitted to the first, second, and third protrusions 312a, 312b, and 312c, thereby further suppressing the transmission of vibrations to the fixed cylinder 22 and further reducing the noise level of the lens barrel 20.

[0059] In this embodiment, the plurality of buffer members 40 are made of engineering plastic or super engineering plastic, thereby enabling the buffer members 40 to position the diaphragm device 30 and suppressing the transmission of vibration generated by the diaphragm device 30 to the fixed cylinder 22 .

[0060] Furthermore, the plurality of buffer members 40 may be made of metal as long as the outer dimensions before and after assembly with the lens barrel 20 are substantially the same and the vibration transmission rate is lower than that of the fixed tube 22 .

[0061] Furthermore, in the above embodiment, the buffer member 40 is an annular cylindrical member, but the present invention is not limited thereto. The buffer member 40 may also be, for example, a rectangular parallelepiped. In this case, the wall portion 316a of the fitting portion 315 of the opening member 31 and the wall portion 225 of the fitting portion 224 of the fixed tube 22 only need to contact at least a portion of the surfaces of the buffer member 40 other than the surfaces that contact the opening member 31 and the fixed tube 22 in the direction of the optical axis OA.

[0062] Furthermore, in the above embodiment, the structures of the first to third protrusions 312a to 312c of the opening member 31 and the first to third opposing portions 223a to 223c of the fixed cylinder 22 may be reversed. Specifically, the first opposing portion 223a of the fixed cylinder 22 may be provided with a fitting portion that fits with the buffer member 40, the second opposing portion 223b may be provided with a wall portion that contacts the outer periphery of the buffer member 40 in the circumferential direction of a circle centered on the optical axis OA, and the third opposing portion 223c may be provided with no wall portion that contacts the buffer member 40. In this case, the fitting portions that fit with the buffer member 40 may be formed on the first, second, and third protrusions 312a, 312b, and 312c of the opening member 31.

[0063] In the above embodiment, an example of providing three buffer members 40 is described. However, the third protrusion 312c of the opening member 31 may be omitted and two buffer members 40 may be provided. Furthermore, multiple buffer members 40 may be provided for any one of the first protrusion 312a, the second protrusion 312b, and the third protrusion 312c, or four or more buffer members 40 may be provided.

[0064] In the above embodiment, the aperture device 30 is attached to the fixed cylinder 22. However, the fixed cylinder 22 may be a cylinder that does not move in the direction of the optical axis OA or a cylinder that moves in the direction of the optical axis OA. Furthermore, the fixed cylinder 22 may be a lens holding frame that holds a lens.

[0065] The above-mentioned embodiment is a preferred example, but is not limited thereto, and various modifications can be made without departing from the spirit and scope, and arbitrary components can be combined.

[0066] Label Description

[0067] 1. Camera

[0068] 12 Camera Elements

[0069] 20 lens barrel

[0070] 22 Fixed cylinder

[0071] 31 Opening components

[0072] 33 aperture blades

[0073] 40 Buffering member

[0074] 223 relative part

[0075] 224 Chimeric part

[0076] 225 Wall

[0077] 226 contact surface

[0078] 223a First relative portion

[0079] 223b Second relative portion

[0080] 223c Third relative part

[0081] 312a First protrusion

[0082] 312b Second protrusion

[0083] 312c Third protrusion

[0084] 313 Main body

[0085] 315 Chimeric part

[0086] 314 Slit

[0087] 316a, 316b wall portions

[0088] 317a, 317b contact surfaces

Claims

1. A lens barrel comprising: multiple aperture blades; a driving unit, configured to drive the plurality of aperture blades; a first opening member for holding the driving portion; a second opening member including a plurality of opposing portions, the plurality of opposing portions being opposed to the first opening member in the optical axis direction; and a plurality of buffer members, each disposed between the first opening member and the plurality of opposing portions; The plurality of buffer members perform positioning of the first opening member relative to the second opening member.

2. The lens barrel according to claim 1, wherein: The first opening member is not in contact with the second opening member.

3. The lens barrel according to claim 1, wherein: The outer dimensions of each of the plurality of buffer members before assembly with the lens barrel are substantially consistent with the outer dimensions after assembly with the lens barrel.

4. The lens barrel according to claim 1, wherein: The plurality of buffer members are members having a lower vibration transmissibility than the second opening member.

5. The lens barrel according to claim 1, wherein: The first opening member includes a fitting portion that fits with the buffer member at a position opposing a first opposing portion among the plurality of opposing portions in the optical axis direction.

6. The lens barrel according to claim 5, wherein: The fitting portion includes a first wall portion extending in the optical axis direction and fitting with at least a portion of the buffer member.

7. The lens barrel according to claim 1, wherein: The first opening member includes a second wall portion that contacts at least a portion of the buffer member at a position opposing a second opposing portion among the plurality of opposing portions in the optical axis direction.

8. The lens barrel according to claim 7, wherein: The second wall portion extends in the optical axis direction and contacts the buffer member in a circumferential direction of a circle centered on the optical axis.

9. The lens barrel according to claim 1, wherein: The first opening member has a third opposing portion among the plurality of opposing portions.

10. The lens barrel according to claim 1, wherein: The plurality of facing portions are engaged with the buffer member.

11. The lens barrel according to claim 1, wherein: A first facing portion among the plurality of facing portions includes a fitting portion that fits with the buffer member.

12. The lens barrel according to claim 11, wherein: A second opposing portion of the plurality of opposing portions includes a wall portion that contacts the buffer member in a circumferential direction of a circle centered on the optical axis.

13. The lens barrel according to claim 11, wherein: A third opposing portion among the plurality of opposing portions does not have a wall portion extending in the optical axis direction.

14. The lens barrel according to claim 1, wherein: The first opening member includes: a main body portion holding the driving portion; and a plurality of protrusions protruding from the main body portion in a direction intersecting the optical axis and facing the plurality of opposing portions. The main body has a slit extending in the circumferential direction of a circle centered on the optical axis at a position facing the protrusion in the radial direction of the circle.

15. The lens barrel according to claim 1, wherein: In a state where the first opening member is not positioned relative to the second opening member, the first buffer member, which is one of the plurality of buffer members, is not positioned relative to the first opening member in the circumferential direction.

16. The lens barrel according to claim 15, wherein: In a state where the first opening member is not positioned relative to the second opening member, the second buffer member, which is one of the plurality of buffer members, is positioned relative to the first opening member in radial and circumferential directions.

17. The lens barrel according to claim 16, wherein: In a state where the first opening member is not positioned relative to the second opening member, the third buffer member, which is one of the plurality of buffer members, is positioned relative to the first opening member in the circumferential direction and is not positioned in the radial direction.

18. The lens barrel according to claim 1, wherein: The plurality of buffer members are made of engineering plastic or super engineering plastic.

19. A photographing device comprising: The lens barrel according to claim 1; and Shooting element.

Images