Lens barrel

Abstract

The present invention provides a lens barrel that can prevent the position of the lens frame in the optical axis direction from changing even when an external force is applied to the lens frame in the optical axis direction. [Solution] The lens barrel 10 comprises a lens unit holding frame 27, a lens unit 25, an adjustment screw 24, and a sinking prevention member 23. The lens unit 25 is attached to the lens unit holding frame 27. The adjustment screw 24 restricts the movement of the lens unit 25 in the direction away from the lens unit holding frame 27 in the optical axis direction by its screw head 24b, and adjusts the inclination of the lens unit 25 with respect to the lens unit holding frame 27. The sinking prevention member 23 is fixed to the lens unit 25 and is provided at a position that contacts the screw head 24b of the adjustment screw 24 in the optical axis direction.

Description

Technical Field

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[0001] The present disclosure relates to, for example, a lens barrel attached to a camera body.

Background Art

[0002] In recent years, in a lens barrel including a lens frame that holds a lens, in order to adjust the inclination of the optical axis of the lens, a configuration for adjusting the inclination of the lens frame with respect to a reference frame has been adopted. For example, Patent Document 1 discloses a lens barrel including a frame that holds an optical element, a cylindrical frame holding member that holds the frame, and an adjustment unit that adjusts the inclination of the frame with respect to a predetermined axis of the frame holding member so that the optical axis of the optical element is parallel to the predetermined axis of the frame holding member.

[0003] In this lens barrel, the adjustment unit includes an adjustment screw having a screw head and a screw shaft formed with a male screw portion, a female screw portion formed in the frame holding member so as to extend along a direction parallel to the optical axis and engageable with the male screw portion, a through hole formed in the frame along a direction parallel to the optical axis, a contact portion around the through hole that contacts the screw head when the screw shaft is inserted into the through hole, and a hole portion formed continuously with the female screw portion in the frame holding member. The screw shaft extends from the male screw portion to the screw tip side of the adjustment screw and has a fitting portion that fits into the hole portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the above - mentioned conventional lens barrel has the following problems. In other words, in the lens barrel disclosed in the above publication, if an external force is applied to the lens frame in the direction of the optical axis, the position of the lens frame, which is restricted by the screw head of the adjustment screw, changes as the biasing member contracts, which may adversely affect optical performance such as resolution. The object of this disclosure is to provide a lens barrel that can prevent the position of the lens frame in the optical axis direction from changing even when an external force is applied to the lens frame in the optical axis direction. [Means for solving the problem]

[0006] The lens barrel according to this disclosure comprises a substantially cylindrical reference frame, a lens frame, a fastening member, and a sinking prevention member. The lens frame holds the lens and is attached to the reference frame. The fastening member has a threaded portion that screws into the reference frame and a screw head provided on the opposite side of the threaded portion. The screw head restricts the movement of the lens frame in the direction away from the reference frame in the optical axis direction, and adjusts the inclination of the lens frame relative to the reference frame by changing the threaded length of the threaded portion. The sinking prevention member is fixed to the lens frame and is provided at a position that contacts the screw head of the fastening member in the optical axis direction. [Effects of the Invention]

[0007] According to the lens barrel of this disclosure, even when an external force is applied to the lens frame in the optical axis direction, it is possible to prevent the position of the lens frame in the optical axis direction from changing. [Brief explanation of the drawing]

[0008] [Figure 1] An overall perspective view showing the configuration of a lens barrel according to one embodiment of the present disclosure. [Figure 2A] Figure 1 is an external perspective view showing the lens barrel in the WIDE position. [Figure 2B] Figure 1 is an external perspective view showing the lens barrel in the TELE position. [Figure 3] Figure 1 is an exploded perspective view showing the individual components that make up the lens barrel. [Figure 4] Cross-sectional view of the lens barrel of FIG. 1. [Figure 5A] Cross-sectional view showing the lens barrel of FIG. 1 in the WIDE position. [Figure 5B] Cross-sectional view showing the lens barrel of FIG. 1 in the TELE position. [Figure 6] Exploded perspective view showing the configuration of the first-group unit included in the lens barrel of FIG. 1. [Figure 7] Front view of the first-group unit of FIG. 6 as seen from the subject side with the decorative ring removed. [Figure 8] Cross-sectional view taken along line A-A of FIG. 7. [Figure 9] Cross-sectional view with the background portion of FIG. 8 removed. [Figure 10A] Cross-sectional view taken along line B-B of the first-group unit of FIG. 7. [Figure 10B] Cross-sectional view with the background portion of (a) removed. [Figure 11] Exploded perspective view showing the configuration of the first-group unit included in the lens barrel according to another embodiment of the present disclosure. [Figure 12] Front view of the first-group unit of FIG. 11 as seen from the subject side with the decorative ring removed. [Figure 13A] Enlarged view showing the periphery of the through-hole formed in the lens frame of the X portion of FIG. 12. [Figure 13B] Enlarged view showing the state in which the adjustment screw is inserted into the through-hole formed in the lens frame of FIG. 13A. [Figure 13C] Enlarged view showing the state in which the lens frame is rotated in the direction of the arrow in the figure from the state shown in FIG. 13B and the regulating portion is engaged with a part of the adjustment screw. [Figure 14A] Cross-sectional view corresponding to FIG. 13B and showing the state in which the adjustment screw is inserted into the through-hole formed in the lens frame. [Figure 14B] Corresponding to FIG. 13C, enlarged view showing the state in which the lens frame is rotated in the direction of the arrow in the figure from the state shown in FIG. 14A and the regulating portion is engaged with a part of the adjustment screw.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, detailed descriptions that are not necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially identical configurations may be omitted. This is to avoid making the following description unnecessarily redundant and to facilitate the understanding of those skilled in the art. Note that the applicant provides the accompanying drawings and the following description for those skilled in the art to fully understand the present disclosure, and does not intend to limit the subject matter described in the claims thereby.

[0010] (Embodiment 1) A lens barrel according to an embodiment of the present disclosure will be described as follows with reference to FIGS. 1 to 10B. (1) Configuration of the entire lens barrel 10 As shown in FIG. 1, the lens barrel 10 according to the present embodiment is detachably attached to a camera body (not shown) and performs photographing of a subject. The lens barrel 10 performs zoom photographing by moving an internal optical system (a plurality of lenses L1 to L8) between a wide-angle side (position on the WIDE side) shown in FIG. 2A and a telephoto side (position on the TELE side) shown in FIG. 2B.

[0011] As shown in FIG. 3, the lens barrel 10 includes a first-group unit 11, a front-frame unit 12, a cam-straight movement unit , a second-third-group unit 14, an exterior unit 15, a rear-frame unit 16, and a lens mount 17. As shown in FIG. 3, the first-group unit 11 is arranged on the subject side most in the optical axis direction among the members constituting the lens barrel 10. The first-group unit 11 holds lenses L1 to L4 on the substantially cylindrical inner peripheral side as shown in FIG. 4.

[0012] Details of the configuration of the first-group unit 11 will be described in detail later. As shown in FIG. 3, the front-frame unit 12 has a substantially annular main body portion 12a and a locked portion 12b that engages with the inner peripheral surface of the exterior unit 15 that encloses the cam-straight movement unit 13 and the second-third-group unit 14. As shown in Figure 3, the cam linear unit 13 is a substantially cylindrical member enclosed on the inner circumferential side of the outer unit 15, and has three cam followers 13a protruding radially outward from the outer circumferential surface and a cam groove 13b formed on the inner circumferential surface.

[0013] The three cam followers 13a engage with cam grooves formed on the inner circumferential surface of the exterior unit 15, and move along the straight grooves formed on the inner circumferential surface of the exterior unit 15 as the focus ring 15b and zoom ring 15c of the exterior unit 15 are rotated. As shown in Figure 3, the 2-3 group unit 14 is a substantially cylindrical member enclosed on the inner circumferential side of the outer unit 15, and as shown in Figure 4, it holds lenses L5 to L8. The 2-3 group unit 14 has three cam followers 14a that protrude radially outward from its outer circumferential surface.

[0014] The three cam followers 14a engage with cam grooves 13b formed on the inner circumferential surface of the cam-linear unit 13. When the focus ring 15b and zoom ring 15c of the outer unit 15 are rotated, the cam followers 14a move along the cam grooves 13b, causing the 2-3 group unit 14 to move back and forth in the optical axis direction between the WIDE position shown in Figure 5A and the TELE position shown in Figure 5B.

[0015] As shown in Figure 3, the exterior unit 15 includes a substantially cylindrical main body portion 15a that constitutes the exterior of the lens barrel 10, and a focus ring 15b and a zoom ring 15c that are attached to the outer surface of the main body portion 15a in a manner that allows them to rotate in the circumferential direction about the optical axis. As shown in Figure 3, the rear frame unit 16 is a substantially cylindrical member that is attached to cover the outer circumferential surface of the rear end of the exterior unit 15.

[0016] As shown in Figure 3, the lens mount 17 is a connecting member for attaching the lens barrel 10 to the camera body (not shown), and is attached to the end of the exterior unit 15 opposite to the subject in the optical axis direction. (2) Configuration of Group 1 Unit 11 As shown in Figure 6, the group unit 11 comprises a decorative ring 21, a fixing screw 22, a sinking prevention member 23, an adjustment screw (fastening member) 24, a lens unit (lens frame) 25, an adjustment spring (biasing member) 26, and a lens unit holding frame (reference frame) 27.

[0017] As shown in Figure 6, the decorative ring 21 is a substantially disc-shaped member located on the subject-facing side in the optical axis direction of the group unit 11, and is attached to the inner circumferential surface of the lens unit holding frame 27 so as to cover the substantially disc-shaped surface on the subject-facing side of the lens unit 25. This covers the sinking prevention member 23, etc., which will be described later, so that they cannot be seen from the subject side.

[0018] As shown in Figure 7, two fixing screws 22 are provided for each sinking prevention member 23 in order to fix the sinking prevention member 23 to the lens unit 25. As a result, the three anti-sinking members 23 are fixed to the approximately disc-shaped surface of the lens unit 25 on the subject side in the optical axis direction, and are integrated with the lens unit 25. As shown in Figure 6, the sinking prevention member 23 is a plate-shaped member fixed to the substantially disc-shaped surface of the lens unit 25, and is provided as a separate member from the lens unit 25. As shown in Figure 7, the sinking prevention member 23 is provided at positions opposite to the adjustment screws 24, which are provided at substantially equal angle (approximately 120 degrees) intervals in the circumferential direction centered on the optical axis. As shown in Figure 8, the sinking prevention member 23 is positioned to cover the screw head 24b of the adjustment screw 24.

[0019] Furthermore, as shown in Figures 7 and 8, the sinking prevention member 23 has a hole 23a into which a jig (such as a screwdriver) for tilting the lens unit 25 is inserted. This allows the tilt of the lens unit 25 relative to the lens unit holding frame 27 to be adjusted by rotating the adjustment screw 24 using a tilt adjustment jig (such as a screwdriver) inserted into the hole 23a.

[0020] Three adjustment screws (fastening members) 24 are provided at approximately equal angle intervals (about 120 degrees) in the circumferential direction around the optical axis in order to adjust the inclination of the lens unit 25 with respect to the lens unit holding frame 27. As shown in Figures 8 and 9, the adjustment screw 24 has a threaded portion 24a with male threads formed on its outer circumference, and a screw head 24b provided on the side opposite to the threaded side of the threaded portion 24a.

[0021] As shown in Figures 8 and 9, the threaded portion 24a is screwed into a threaded hole provided in the lens unit holding frame 27. As shown in Figures 8 and 9, the screw head 24b is the portion with a larger outer diameter than the screw portion 24a and is positioned on the subject side in the optical axis direction. The surface of the screw head 24b on the subject side in the optical axis direction is in contact with the sinking prevention member 23 fixed to the lens unit 25.

[0022] The lens unit (lens frame) 25, as shown in Figure 4, is a lens frame that holds lenses L1 to L4, and is attached to the lens unit holding frame 27 via an adjustment spring 26 and an adjustment screw 24, as shown in Figures 8 and 9. More specifically, the lens unit 25 is attached to the lens unit holding frame 27 in a manner that allows it to swing using the adjustment screw 24, with the adjustment spring 26 inserted between it and the lens unit holding frame 27.

[0023] As shown in Figures 6 and 7, the adjustment spring (biasing member) 26 is provided between the lens unit holding frame 27 and the lens unit 25, and applies a biasing force to the lens unit holding frame 27 in the optical axis direction. The adjustment spring 26 is a spirally formed member that applies a biasing force in the optical axis direction, and together with the adjustment screw 24, three springs are provided in the circumferential direction centered on the optical axis.

[0024] Here, as shown in Figures 8 and 9, the adjustment spring 26 is positioned with both ends sandwiched between the lens unit holding frame 27 and the screw head 24b of the adjustment screw 24. Therefore, the screw portion 24a of the adjustment screw 24 expands and contracts according to the length it is screwed into the lens unit holding frame 27. As a result, the lens unit 25 can adjust its tilt relative to the lens unit holding frame 27 by rotating the adjustment screws 24, which provide three-point support to the lens unit holding frame 27, thereby changing the length of the screws that engage with the lens unit holding frame 27. Therefore, the orientation of the optical axes of the lenses L1 to L4 held by the lens unit 25 can be aligned with the image sensor provided on the camera body (not shown).

[0025] However, the adjustment spring 26 is used as an auxiliary component and has the effect of reducing the impact of manufacturing tolerances on accuracy. The specific configuration for fixing the lens unit holding frame 27 (the sinking prevention member 23) will be described later. As shown in Figure 6, the lens unit holding frame (reference frame) 27 is a roughly cylindrical member positioned furthest from the subject in the optical axis direction. The lens unit 25 is attached to the lens unit holding frame 27 from the subject side in the optical axis direction, and it serves as the reference frame when adjusting the tilt of the lens unit 25.

[0026] As shown in Figure 6, the lens unit holding frame 27 has a substantially cylindrical main body portion 27a and a substantially cylindrical screw receiving portion 27b provided on the inner circumferential surface side of the main body portion 27a and extending along the optical axis direction. Three screw receiving portions 27b are provided on the inner circumferential surface of the substantially cylindrical main body portion 27a at approximately equal angle (about 120 degrees) intervals. Furthermore, screw holes (female threads) are formed in the screw receiving portions 27b along the central axis of the substantially cylindrical portion.

[0027] As a result, the threaded portions 24a of the three adjustment screws 24 are screwed into the threaded holes formed in the threaded receiving portions 27b of the lens unit holding frame 27. Furthermore, as shown in Figures 8 and 9, an adjustment spring 26 is attached to the outer circumference of the roughly cylindrical screw receiving portion 27b so as to be wound around it. As a result, the adjustment spring 26 is positioned along the optical axis, with the end on the subject side held by the screw head 24b of the adjustment screw 24, and the end on the opposite side of the subject held by the base of the screw receiving portion 27b of the lens unit holding frame 27.

[0028] In this embodiment, the lens barrel 10 may be configured to fix the lens unit 25 to the lens unit holding frame 27 without using the adjustment spring 26. In the lens barrel 10 of this embodiment, the sinking prevention member 23 is positioned to cover the screw head 24b of the adjustment screw 24, as shown in Figure 8. At this time, the lens unit 25 is in contact with the screw head 24b of the adjustment screw 24 on the side opposite to the subject in the optical axis direction. That is, the screw head 24b of the adjustment screw 24, whose screw portion 24a is screwed into the lens unit holding frame 27, is covered by the sinking prevention member 23 in contact with the subject side.

[0029] <Anti-sinking mechanism> In the lens barrel 10 of this embodiment, as described above, the lens unit 25 is attached to the lens unit retaining frame 27 via three sets of adjustment screws 24 and adjustment springs 26. The lens barrel 10 is equipped with a tilt adjustment mechanism that adjusts the tilt of the lens unit 25 relative to the lens unit retaining frame 27 by rotating the adjustment screws 24 to change the length of the screws 24 are screwed into the lens unit retaining frame 27.

[0030] In this configuration with such a tilt adjustment mechanism, the lens unit 25's movement toward the subject in the optical axis direction relative to the lens unit holding frame 27 is restricted by the screw head 24b of the adjustment screw 24. On the other hand, the lens unit 25 can move toward the opposite side of the subject in the optical axis direction relative to the lens unit holding frame 27 by contracting the adjustment spring 26.

[0031] In a conventional configuration where the sinking prevention member 23 is not provided, if an external force is applied to the lens unit 25 from the subject side in the optical axis direction, the lens unit 25 will move (sink) to the opposite side of the subject in the optical axis direction while the adjustment spring 26 is compressed. As a result, the inclination of the lens unit 25 with respect to the lens unit holding frame 27 adjusted by the adjustment screw 24 will change, which may adversely affect optical performance such as resolution.

[0032] Therefore, in the lens barrel 10 of this embodiment, as shown in Figures 10A and 10B, the sinking prevention member 23 is fixed to the surface of the lens unit 25 on the subject side in the optical axis direction and is integrated with the lens unit 25. The surface of the sinking prevention member 23 opposite to the subject in the optical axis direction is in contact with the screw head 24b of the adjustment screw 24 which is screwed into and integrated with the lens unit holding frame 27, as shown in Figures 10A and 10B.

[0033] Therefore, the sinking prevention member 23 functions as a stopper to prevent the lens unit 25 from moving away from the subject in the optical axis direction, so the lens unit 25 does not sink away from the subject in the optical axis direction. <Key Features> The lens barrel 10 of this embodiment comprises a substantially cylindrical lens unit holding frame 27, a lens unit 25, an adjustment screw 24, and a sinking prevention member 23. The lens unit 25 holds lenses L1 to L4 and is mounted on the lens unit holding frame 27. The adjustment screw 24 has a threaded portion 24a that screws into the lens unit holding frame 27 and a screw head 24b provided on the opposite side of the threaded portion 24a. The screw head 24b restricts the movement of the lens unit 25 in the direction away from the lens unit holding frame 27 in the optical axis direction, and adjusts the inclination of the lens unit 25 relative to the lens unit holding frame 27 by changing the threaded length of the threaded portion 24a. The sinking prevention member 23 is fixed to the lens unit 25 and is provided at a position that contacts the screw head 24b of the adjustment screw 24 in the optical axis direction.

[0034] As a result, when an external force is applied to the lens unit 25 from the subject side in the optical axis direction, the sinking prevention member 23, which is integrated with the lens unit 25, comes into contact with the screw head 24b, and the sinking prevention member 23 functions as a stopper. Therefore, the lens unit 25 maintains its position without moving in a way that causes it to sink away from the subject in the optical axis direction.

[0035] As a result, even when an external force is applied to the lens unit 25 in the optical axis direction, it is possible to prevent the position of the lens unit 25 in the optical axis direction from changing. [Other embodiments] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment, and various modifications are possible without departing from the gist of the disclosure.

[0036] (A) In the above embodiment, the sinking prevention member 23 is provided as a separate component from the lens unit 25 and is described as being fixed to the lens unit 25 using fixing screws 22. However, this disclosure is not limited thereto. For example, the anti-sinking member may be integrated with the lens unit.

[0037] Specifically, the regulating portion 123, which is provided as a sinking prevention member, may be integrally molded with the lens unit (lens frame) 125 (see Figure 13A, etc.). In this case, as shown in Figure 11, the configuration of the group unit 111 eliminates the need for the sinking prevention member 23 and the fixing screws 22 for fixing it, compared to the configuration of the group unit 11 described in the above embodiment.

[0038] As shown in Figures 11 and 12, the group unit 111 comprises a decorative ring 21, an adjustment screw (fastening member) 124, a lens unit (lens frame) 125, an adjustment spring 26, and a lens unit holding frame 27. The lens unit 125 has a roughly annular main body portion 125a, a through hole 125b into which an adjustment screw 24 is inserted along the optical axis direction and which has an opening formed along the circumferential direction, and a regulating portion (anti-sinking member) 123.

[0039] As shown in Figure 13A, the restricting portion (anti-sinking member) 123 is provided near the through hole 125b formed in the main body portion 125a of the lens unit 125, and is provided to protrude in the circumferential direction around the optical axis. Then, as shown in Figure 13B, when the lens unit 125 is rotated in the circumferential direction (in the direction of the arrow in Figure 13B) with the adjustment screw 24 inserted into the through hole 125b, the restricting portion 123 engages with a part of the adjustment screw 124 (recess 124c), as shown in Figure 13C, restricting the movement of the adjustment screw 124 in the optical axis direction.

[0040] As shown in Figure 14A, when the adjustment screw (fastening member) 124 is inserted into the through hole 125b of the lens unit 125, the adjustment spring 26 is wound around the outer surface. When the lens unit 125 is rotated in the circumferential direction in this state, as shown in Figure 14B, the regulating part 123, which is integrally molded with the lens unit 125, is inserted into the recess 124c formed on the outer surface.

[0041] This restricts the movement of the adjustment screw 124 in the optical axis direction. Therefore, when an external force is applied to the lens unit 125 from the subject side in the optical axis direction, the restricting portion 123, which is integrally molded with the lens unit 125, functions as a stopper. As a result, the lens unit 125 maintains its position without moving in a way that causes it to sink away from the subject in the optical axis direction.

[0042] As a result, even when an external force is applied to the lens unit 125 in the optical axis direction, it is possible to prevent the position of the lens unit 125 in the optical axis direction from changing, thus achieving the same effect as in Embodiment 1 described above. (B) In the above embodiments, the configuration of the present invention was described using an example in which it is applied to a group unit 11. However, the present disclosure is not limited thereto.

[0043] For example, the present invention may be applied to lens frames other than the 1st group unit. (C) In the above embodiment, an example was described in which adjustment screws 24 and adjustment springs 26 for adjusting the tilt of the lens unit 25 relative to the lens unit holding frame 27 are arranged at three locations at approximately equal angular intervals in the circumferential direction around the optical axis. However, the present disclosure is not limited thereto.

[0044] For example, the adjustment screws (fastening members) and adjustment springs (biasing members) for tilt adjustment are not limited to three locations; they may be two or four or more locations. Furthermore, the adjustment screws (fastening members) and adjustment springs (biasing members) for tilt adjustment may be arranged not at approximately equal angular intervals. (D) In the above embodiment, an example was given in which a spirally formed adjustment spring was used as the biasing member. However, this disclosure is not limited thereto.

[0045] For example, a configuration using a biasing member of another form, such as a plate-shaped spring, may also be used. (E) In the above embodiment, an example was described in which the sinking prevention member 23 is brought into contact with the screw head 24b of the adjustment screw 24 to prevent the lens unit 25 from sinking. However, this disclosure is not limited thereto.

[0046] For example, the configuration may involve attaching a sinking prevention member to a part of the fastening member (adjustment screw) other than the head, thereby preventing the lens frame (lens unit) from sinking. <Note> Based on the above description of embodiments, the following technologies are disclosed. (Technology 1) The lens barrel relating to Technology 1 is A roughly cylindrical reference frame, A lens frame that holds the lens and is attached to the reference frame, A fastening member having a threaded portion that screws into the reference frame and a screw head provided on the opposite side of the threaded portion, wherein the screw head restricts the movement of the lens frame in the direction away from the reference frame in the optical axis direction, and adjusts the inclination of the lens frame with respect to the reference frame by changing the screw length of the threaded portion, A sinking prevention member is fixed to the lens frame and is provided at a position that abuts against a part of the fastening member in the optical axis direction, It is equipped with.

[0047] (Technology 2) The lens barrel relating to Technology 2 is the lens barrel relating to Technology 1, The system further includes a biasing member provided between the reference frame and the lens frame, which applies a biasing force to the lens frame in the optical axis direction relative to the reference frame. (Technology 3) The lens barrel relating to Technology 3 is a lens barrel relating to Technology 1 or 2, The lens frame and the sinking prevention member are provided as separate components.

[0048] (Technology 4) The lens barrel relating to Technology 4 is a lens barrel relating to any one of Technology 1 to 3, The aforementioned sinking prevention member has a hole into which a jig for tilting the lens frame is inserted. (Technology 5) The lens barrel relating to Technology 5 is the lens barrel relating to Technology 1, The lens frame and the sinking prevention member are provided as a single unit.

[0049] (Technology 6) The lens barrel relating to Technology 6 is the lens barrel relating to Technology 5, The lens frame has a through hole into which the fastening member is inserted along the optical axis direction and into which an opening is formed along the circumferential direction, and a restricting portion located near the through hole that engages with a part of the fastening member when the lens frame rotates in the circumferential direction with the fastening member inserted in the through hole, thereby restricting the movement of the fastening member in the optical axis direction.

[0050] (Technology 7) The lens barrel relating to Technology 7 is a lens barrel relating to any one of Technology 1 to 6, The sinking prevention member is positioned to cover the screw head in the optical axis direction. (Technology 8) The lens barrel relating to Technology 8 is a lens barrel relating to any one of Technology 1 to 7, The lens frame is in contact with the screw head on the surface opposite to the reference frame in the optical axis direction.

[0051] (Technology 9) The lens barrel relating to Technology 9 is a lens barrel relating to any one of Technology 1 to 8, The biasing member is a spiral spring member, The fastening member is screwed into the reference frame with the threaded portion inserted along the central axis of the biasing member.

[0052] (Technology 10) The lens barrel relating to technology 10 is a lens barrel relating to any one of technologies 1 to 9, Multiple sets of the biasing member and the fastening member are provided in the circumferential direction centered on the optical axis.

[0053] (Technology 11) The lens barrel relating to technology 11 is the lens barrel relating to technology 10, The multiple biasing members and fastening members are provided at approximately equal angular intervals in the circumferential direction centered on the optical axis. [Industrial applicability]

[0054] The lens barrel of this disclosure has the effect of preventing the position of the lens frame in the optical axis direction from changing even when an external force is applied to the lens frame in the optical axis direction, and is therefore widely applicable to various types of lens barrels. [Explanation of Symbols]

[0055] 10 Lens barrel 11 Group 1 Unit 12 Front frame unit 12a Main body 12b Locked part 13 Cam / Straight-line unit 13a Cam follower 13b Cam groove 14 Group 2-3 Unit 14a Cam Follower 15 Exterior Units 15a Main body 15b Focus Ring 15c zoom ring 16 Rear frame unit 17 Lens Mount 21 Cosmetic Ring 22 Fixing screws 23. Anti-sinking member 23a Hole 24 Adjustment screw (fastening component) 24a Threaded part 24b Screw head 25 Lens Unit (Lens Frame) 26 Adjustment spring (biasing member) 27. Lens unit holding frame (reference frame) 27a Main body 27b Screw receiving section 111 Group 1 Unit 123 Restricting section (anti-sinking member) 124 Adjustment screw (fastening component) 124c recess 125 Lens Unit (Lens Frame) 125a Main body 125b through hole

Claims

1. A roughly cylindrical reference frame, A lens frame that holds the lens and is attached to the reference frame, A fastening member having a threaded portion that screws into the reference frame and a screw head provided on the opposite side of the threaded portion, wherein the screw head restricts the movement of the lens frame in the direction away from the reference frame in the optical axis direction, and adjusts the inclination of the lens frame with respect to the reference frame by changing the screw length of the threaded portion, A sinking prevention member is fixed to the lens frame and is provided at a position that abuts against a part of the fastening member in the optical axis direction, A lens barrel equipped with this feature.

2. The system further includes a biasing member provided between the reference frame and the lens frame, which applies a biasing force to the lens frame in the optical axis direction relative to the reference frame. The lens barrel according to claim 1.

3. The lens frame and the sinking prevention member are provided as separate components. The lens barrel according to claim 1 or 2.

4. The aforementioned sinking prevention member has a hole into which a jig for tilting the lens frame is inserted. The lens barrel according to claim 1 or 2.

5. The lens frame and the sinking prevention member are provided as a single unit. The lens barrel according to claim 1.

6. The lens frame has a through hole into which the fastening member is inserted along the optical axis direction and into which an opening is formed along the circumferential direction, and a restricting portion located near the through hole that engages with a part of the fastening member when the lens frame rotates in the circumferential direction with the fastening member inserted in the through hole, thereby restricting the movement of the fastening member in the optical axis direction. The lens barrel according to claim 5.

7. The sinking prevention member is positioned to cover the screw head in the optical axis direction. The lens barrel according to claim 1 or 2.

8. The lens frame is in contact with the screw head on the surface opposite to the reference frame in the optical axis direction. The lens barrel according to claim 1 or 2.

9. The biasing member is a spiral spring member, The fastening member is screwed into the reference frame with the threaded portion inserted along the central axis of the biasing member. The lens barrel according to claim 1 or 2.

10. Multiple sets of the biasing member and the fastening member are provided in the circumferential direction centered on the optical axis. The lens barrel according to claim 1 or 2.

11. The multiple biasing members and fastening members are provided at approximately equal angular intervals in the circumferential direction centered on the optical axis. The lens barrel according to claim 10.

Images