Lens barrel

Abstract

Provided is a lens barrel in which the interval between lenses of a movable zoom lens group can be fine-adjusted from outside.　A lens barrel 10 is provided with an adjustment mechanism for adjusting the interval between a first zoom lens 571 and a second zoom lens 572, 573 that constitute a zoom lens group 57A. The adjustment mechanism has a fixed side hole part 512 that penetrates a fixed tube 51, a cam-side hole part 522 that is aligned with the fixed side hole part 512 when a cam tube 52 rotates with respect to the fixed tube 51, a driving transmission part 566 that is provided on the outer peripheral side of a movable lens holding frame 56 in the same straight line as the fixed side hole part 512 and the cam-side hole part 522 in a state where these hole parts are aligned, an inner peripheral engagement part 554 that is formed on an inner peripheral surface of a fixed lens holding frame 55, and an outer peripheral engagement part 564 that is formed on an outer peripheral surface of the movable lens holding frame 56 in a state of engaging with the inner peripheral engagement part 554, and moves the movable lens holding frame 56 in an optical axis direction by rotating with respect to the inner peripheral engagement part 554.

Description

[Technical Field]

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

[0002] Among the lens barrels provided in cameras, there are some that use a fixed focus eccentricity adjustment device to rotate the lens around the optical axis to adjust the resolution, as shown in Patent Document 1. Patent Document 1 discloses a technology for adjusting the eccentricity of a first lens (26A) constituting a rear fixed focus lens (26) by rotating a rotating member (54) equipped with a gear (54A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-75182 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the configuration disclosed in Patent Document 1 rotates the lenses at a fixed focus, and decentering adjustment is possible, but the lens spacing cannot be adjusted as with a zoom mechanism.

[0005] Furthermore, in a moving lens group such as a zoom mechanism, in order to correct various aberrations (spherical aberration, field curvature, etc.) due to manufacturing errors in the lens barrel, currently, adjustment members such as shims and washers are placed in predetermined locations of the lens frames that hold the lenses (such as between the lens frames that hold the lenses).Then, by changing the thickness and number of the adjustment members as needed, the lens spacing is adjusted to the desired dimension.

[0006] However, in such adjustments, the lens spacing is limited by the lineup of shims and washers, making it difficult to fine-tune the lens spacing. Furthermore, adjusting the lens spacing requires replacing the shims and washers already installed, which requires disassembling the lens barrel for replacement. This increases the number of steps required. Furthermore, disassembling the lens barrel poses a risk of dust getting inside the lens barrel or scratching the lenses. In other words, disassembling the lens barrel poses a risk of performance degradation. Furthermore, after adjusting the lens spacing, the lens barrel must be reassembled to evaluate its performance. However, if the desired performance is not achieved as a result of the performance evaluation, the lens barrel must be disassembled again for fine adjustment. In other words, each time the lens spacing is adjusted and evaluated, the lens barrel must be disassembled and reassembled, resulting in a significant amount of work.

[0007] The present invention has been made in view of the above problems, and its object is to provide a lens barrel in which the lens spacing of a movable zoom lens group can be finely adjusted from the outside. [Means for solving the problem]

[0008] In order to solve the above problems, according to a first aspect of the present invention, there is provided a lens barrel that holds therein a lens system having a plurality of lens groups, each having one or more optical elements, the lens barrel comprising: a fixed barrel having guide grooves formed along the optical axis direction and into which cam followers are fitted; a cam barrel that is rotatable relative to the fixed barrel and has cam grooves into which the cam followers are fitted and that are inclined relative to the optical axis direction; a movement mechanism that moves at least one of the lens groups as a movable lens group in the optical axis direction to change the focal length or the focus position; and an adjustment mechanism that adjusts the position in the optical axis direction of at least one optical element that constitutes an adjustment movable lens group that is at least one movable lens group, the movement mechanism having cam followers attached thereto and a cam groove that is inclined relative to the fixed barrel. and a movable lens holding frame that holds at least some of the optical elements of the moving lens group, wherein the adjustment mechanism has a fixed side hole that passes through the fixed barrel, a cam side hole that passes through the cam barrel and is aligned with the fixed side hole when the cam barrel rotates relative to the fixed barrel, a drive transmission unit that is provided on the outer periphery of the movable lens holding frame on the same straight line as the fixed side hole and the cam side hole when they are aligned, an inner peripheral engagement unit that is formed on the inner periphery of the movable holding frame, and an outer peripheral engagement unit that is formed on the outer periphery of the movable lens holding frame in a state of engagement with the inner peripheral engagement unit, and that rotates relative to the inner peripheral engagement unit when an external force is transmitted in the rotational direction via the drive transmission unit, thereby moving the movable lens holding frame in the optical axis direction.

[0009] Furthermore, in addition to the above-mentioned invention, another aspect of the present invention is that the adjustment movable lens group preferably has at least a first adjustment movable lens subgroup and a second adjustment movable lens subgroup, the first adjustment movable lens subgroup being held by a movable holding frame, and the second adjustment movable lens subgroup being held by a movable lens holding frame.

[0010] Furthermore, in addition to the above-mentioned invention, another aspect of the present invention further includes a position fixing mechanism that fixes the positions of the fixed lens holding frame and the movable lens holding frame after the adjustment of the distance between them by the adjustment mechanism is completed, and it is preferable that the position fixing mechanism includes a screw hole that passes through the cylindrical portion of the movable holding frame, a fixing screw that is screwed into the screw hole, a fixed-side through-hole that passes through the fixed cylinder, through which the fixing screw is inserted, and which is in the same straight line as the screw hole, and a cam-side through-hole that passes through the cam cylinder, through which the fixing screw is inserted, and which is in the same straight line as the screw hole and the fixed-side through-hole when the cam-side hole is aligned with the fixed-side hole.

[0011] In addition to the above-mentioned invention, another aspect of the present invention is that, preferably, the fixed side through hole is provided in a position that does not interfere with the fixed side hole portion, and the cam side through hole is provided in a position that does not interfere with the cam side hole portion.

[0012] In addition to the above-described invention, another aspect of the present invention is preferably such that the moving holding frame is provided with a positioning engagement portion for positioning an adjustment jig inserted from the outside.

[0013] In addition to the above-mentioned invention, another aspect of the present invention is that, preferably, an elastic member is disposed in the gap between the moving holding frame and the movable lens holding frame to bias the two members in a direction separating them from each other.

[0014] In addition to the above-described invention, in another aspect of the present invention, it is preferable that a plurality of fixed-side holes and a plurality of cam-side holes are provided at positions spaced apart in the optical axis direction.

[0015] Another aspect of the present invention is preferably an imaging device having the lens barrel according to the above invention and an imaging element disposed on the telephoto side of the lens barrel.

[0016] In addition to the above-described invention, another aspect of the present invention is preferably an image display device further comprising a lens barrel and an image display element disposed on the telephoto side of the lens barrel. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a lens barrel that allows fine adjustment of the lens spacing of a movable zoom lens group from the outside. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view of a lens barrel according to an embodiment of the present invention, taken along the optical axis, showing a state in which the third lens group (zoom lens group) is positioned on the wide-angle side (wide-angle side). [Figure 2] FIG. 2 is a diagram showing a state in which the third lens group (zoom lens group) shown in FIG. 1 is positioned on the telephoto side. [Figure 3] 2 is a partial cross-sectional view showing an enlarged view of a part of the zoom mechanism of the lens barrel shown in FIG. 1. [Figure 4] 2A and 2B are diagrams showing the positional relationship between guide grooves and cam grooves provided in the zoom mechanism of the lens barrel shown in FIG. 1, where (A) is a planar development of the zoom mechanism, and (B) is a cross-sectional view of the zoom mechanism. [Figure 5] 2 is a perspective view showing the lens barrel shown in FIG. 1, in a state where the vicinity of a fixed-side hole is cut along a plane perpendicular to the optical axis. [Figure 6] 2 is a planar view of the zoom mechanism of the lens barrel shown in FIG. 1, showing the state in which the lens held via the moving frame is positioned on the telephoto side. [Figure 7] 2 is a planar development of the zoom mechanism of the lens barrel shown in FIG. 1, and shows the state in which the lens held via the moving frame is positioned on the wide-angle side. [Figure 8] FIG. 2 is an exploded perspective view showing the configuration of an adjustment jig used in the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] A lens barrel according to an embodiment of the present invention will be described below with reference to the drawings. In the following description, in the direction in which the optical axis A1 of the lens barrel 10 extends (optical axis direction; X direction), the object side is referred to as the front side (X1 side), and the side attached to the camera body (telephoto side) is referred to as the rear side (X2 side). The direction perpendicular to the optical axis direction (X direction) is referred to as the radial direction, with the side away from the optical axis A1 referred to as the outer diameter side and the direction approaching the optical axis A1 referred to as the inner diameter side. The direction of rotation around the optical axis A1 is referred to as the circumferential direction.

[0020] [About the configuration] Fig. 1 is a cross-sectional view of lens barrel 10 according to an embodiment of the present invention, cut along optical axis A1, showing a state in which third lens group 57A (adjustable lens group) is positioned on the wide-angle side. Fig. 2 is a view showing a state in which third lens group 57A (adjustable lens group) shown in Fig. 1 is positioned on the telephoto side. Note that in Figs. 1 and 2, the configuration of lens barrel 10 is omitted as necessary, and multiple lenses, including convex and concave lenses, are shown as a single unit (the same applies to other figures).

[0021] Lens barrel 10 of this embodiment has a lens system consisting of multiple cylindrical sections and multiple lenses (optical elements), which can be broadly divided into an outer barrel 20, a fixed lens section 30, a focus mechanism section 40, and a zoom mechanism section 50. The lens system also has multiple lens groups each having one or more lenses, some of which are configured as movable lens groups that move along the optical axis direction (X direction) during zooming and focusing.

[0022] The outer barrel 20 is a normal member that covers the outer periphery of each member of the lens barrel 10. The outer barrel 20 may be formed by combining multiple cylindrical members, or may be formed from a single cylindrical member.

[0023] An end of the fixed lens unit 30 is attached to a camera body (not shown) of a camera device, which is an example of an imaging device having an image sensor. That is, the fixed lens unit 30 is located rearward (X2 side) of the zoom mechanism unit 50 in the optical axis direction (X direction). The fixed lens unit 30 includes a fixed barrel 31, and a lens holding frame 32 is disposed inside the fixed barrel 31. Therefore, a first lens group 33A, which is one of a lens group consisting of multiple lenses 33, is disposed on the inner barrel side of the fixed lens unit 30 via the lens holding frame 32. Each lens 33 of the first lens group 33A is fixed so as not to move relative to the fixed barrel 31 and the lens holding frame 32. Note that a lens holding frame 32 may be provided for each lens 33, or may hold several lenses 33. The first lens group 33A is a lens group that does not move along the optical axis direction (X direction) during focusing and zooming.

[0024] Furthermore, focus mechanism 40 is located closer to the front (X1 side) in the optical axis direction (X direction) than zoom mechanism 50. This focus mechanism 40 includes a fixed barrel 41 similar to fixed barrel 31, and a lens holding frame 42 is disposed inside fixed barrel 41. A second lens group 43A, which is one of a lens group made up of a plurality of lenses 43, is disposed via lens holding frame 42 on the inner barrel side of focus mechanism 40.

[0025] Here, some of the lenses in the lens holding frame 42 of the focus mechanism 40 are attached to movable frames 44 and 45, which are movable in the optical axis direction (X direction). Therefore, some of the lenses 43 in the second lens group 43A (lenses 431 and 432) are movable in the optical axis direction (X direction) in conjunction with the movement of the movable frames 44 and 45 in the optical axis direction (X direction). Focus adjustment is possible by the movement of the lenses 431 and 432. In this case, the lenses 431 and 432 are each part of a movable lens group. Therefore, the second lens group 43A is composed of four lens groups: two movable lens groups consisting of the lens 431 or the lens 432, and two lens groups that do not move during focusing, located on the X1 side of the lens 431 and between the lenses 431 and 432, respectively.

[0026] In consideration of the sealing performance inside lens barrel 10, it is preferable that moving frame 44 and moving frame 45 move lens 431 on the rear side (X2 side) in the optical axis direction (X direction) more than lens 43 on the front side (X1 side). Also, lens holding frame 42 may be provided for each lens 43, or may hold several lenses 43.

[0027] Next, the zoom mechanism 50 will be described. FIG. 3 is a partial cross-sectional view showing an enlarged portion of the zoom mechanism 50. As shown in FIGS. 1 to 3, the zoom mechanism 50 has a fixed barrel 51, a cam barrel 52, a cam follower 53, a moving frame 54, a fixed lens holding frame 55, a movable lens holding frame 56, and a third lens group 57A that is one of the moving lens groups that moves during zooming and is made up of lenses 571, 572, and 573. The zoom mechanism 50 also has a moving frame 58 and a lens 574. The lens 571 corresponds to a first adjustment movable lens subgroup, and the lenses 572 and 573 correspond to a second adjustment movable lens subgroup.

[0028] Of these, fixed barrel 51 is a cylindrical member, the majority of which is disposed on the inner barrel side of cam barrel 52. This fixed barrel 51 is fixed integrally to the above-described fixed barrels 31 and 41 via screws or the like. As a result, like the above-described fixed barrels 31 and 41, fixed barrel 51 is provided so as not to move or rotate in the optical axis direction (X direction). This fixed barrel 51 is provided with a guide groove 511 in the form of an elongated groove that runs along the optical axis direction (X direction) and penetrates from the inner barrel side (inside) to the outside of the fixed barrel 51. A cam follower 53, which will be described later, is slidably positioned in this guide groove 511. Note that cam follower 53 moves integrally with moving frames 54 and 58, which will be described later, and the tip of cam follower 53 on the outer diameter side of lens barrel 10 is positioned in a cam groove 521, which will be described later.

[0029] Cam barrel 52 is a cylindrical member disposed opposite outer peripheral surface 51a of fixed barrel 51 and is rotatably attached to fixed barrel 51. FIG. 4 shows the positional relationship between guide groove 511 and cam groove 521, with (A) being a planar development of zoom mechanism 50 and (B) being a cross-sectional view of zoom mechanism 50. As shown in FIGS. 3 and 4, cam groove 521 of a predetermined length is provided on the inner barrel side of cam barrel 52. Cam groove 521 has a concave cross section and is formed so as to be oblique with respect to the optical axis direction (X direction). The tip of cam follower 53 on the outer diameter side fits into cam groove 521.

[0030] As described above, cam follower 53 is also fitted into guide groove 511. Here, when guide groove 511 is viewed in plan from the outside in the radial direction as shown in FIG. 4(A), the position of cam follower 53 is restricted to a position (overlapping position) where guide groove 511 and cam groove 521 overlap. As described above, cam groove 521 is formed obliquely with respect to the optical axis direction (X direction), and therefore, when cam barrel 52 is rotated, cam follower 53 located at the above-mentioned overlapping position moves in the optical axis direction (X direction). Due to this movement, moving frames 54 and 58, fixed lens retaining frame 55, movable lens retaining frame 56, and third lens group 57A also move in the optical axis direction (X direction) via cam follower 53.

[0031] Furthermore, cam follower 53 attached to the outer diameter side of flange portion 542 of moving frame 54 is fitted into both guide groove 511 and cam groove 521 at the overlapping position. Similarly, cam follower 53 attached to the outer diameter side of flange portion 581 of moving frame 58 is fitted into both guide groove 511 and cam groove 521 at the overlapping position.

[0032] Furthermore, the moving frame 54 corresponds to a part of the moving holding frame. The moving frame 54 is a member that moves inside the fixed barrel 51 in accordance with the movement of the cam follower 53 described above when the cam barrel 52 is rotated by an external force. Here, the moving frame 54 is located on the front side (X1 side) of the moving frame 58 in the optical axis direction (X direction), and is a frame member for moving the lenses 571, 572, and 573 in the optical axis direction (X direction). On the other hand, the moving frame 58 is located on the rear side (X2 side) of the moving frame 58 in the optical axis direction (X direction), and is a frame member for moving the lens 574 in the optical axis direction (X direction).

[0033] 1 to 3, moving frame 54 is provided with a cylindrical portion 541 and a flange portion 542. On the other hand, as shown in FIGS. 1 and 2, moving frame 58 is a frame member for holding only lens 574, and is not long in the optical axis direction (X direction). Therefore, although moving frame 58 is provided with flange portion 581, it is not provided with a cylindrical portion corresponding to cylindrical portion 541. However, moving frame 58 may be provided with a cylindrical portion.

[0034] The cylindrical portion 541 of the moving frame 54 is a portion provided in a cylindrical shape, and holds the fixed lens holding frame 55 at its inner cylindrical portion on the front side (X1 side) in the optical axis direction (X direction).

[0035] A positioning recess 54a is provided at the front end (X1 side) in the optical axis direction (X1 direction) of the moving frame 54. The positioning recess 54a is a recessed portion into which the tip of a rod portion 633 (described later) fits, and the adjustment jig 60 is positioned relative to the moving frame 54 by this fitting.

[0036] Furthermore, flange portion 542 is a portion that protrudes radially outward from the rear side (X2 side) of cylindrical portion 541 in the optical axis direction (X direction). In this embodiment, a predetermined number (preferably three or more) of flange portions 542 are provided in the circumferential direction of cylindrical portion 541, and these flange portions 542 protrude at predetermined intervals in the circumferential direction. In other words, flange portions 542 are not provided around the entire circumference of cylindrical portion 541. Note that moving frame 54 is also provided with first screw holes 543 (described later).

[0037] The fixed lens retaining frame 55 is a cylindrical member (frame member) that is disposed on the inner diameter side of the moving frame 54 and that holds the lenses 571 (first adjustment movable lens subgroup) that constitute the third lens group 57A. The fixed lens retaining frame 55 corresponds to a part of the moving frame. The fixed lens retaining frame 55 is fixed to the front side (X1 side) of the moving frame 54 via a mounting flange portion 555 (described later) and does not move relative to the moving frame 54. In this embodiment, the fixed lens retaining frame 55 is disposed on the outer diameter side of the movable lens retaining frame 56, and its inner peripheral side faces the outer peripheral side of the movable lens retaining frame 56. However, the fixed lens retaining frame 55 is disposed so as to protrude rearward (X2 side) in the optical axis direction (X direction) from the movable lens retaining frame 56, while the movable lens retaining frame 56 is disposed so as to protrude frontward (X1 side) in the optical axis direction (X direction) from the fixed lens retaining frame 55.

[0038] Furthermore, on the inner tube side of the fixed lens retaining frame 55, a standing wall 551 is provided on the front side (X1 side) in the optical axis direction (X direction) so as to stand toward the outer diameter side, and an expanded diameter portion 552 is provided from the tip of the outer diameter side of the standing wall 551 toward the front side (X1 side). This expanded diameter portion 552 is located radially outward of a portion (referred to as a cylindrical portion 553) on the rear side (X2 side) in the optical axis direction (X direction) of the fixed lens retaining frame 55. Note that a female screw portion 554, which will be described later, is provided on the inner surface side of the expanded diameter portion 552. Furthermore, a second screw hole 556, which will be described later, is provided in the cylindrical portion 553.

[0039] In addition, at the frontmost side in the optical axis direction (X direction) of the expanded diameter portion 552, an attachment flange portion 555 protruding toward the outer diameter side is provided, and the fixed lens holding frame 55 is attached to the front side (X1 side) of the moving frame 54 via this attachment flange portion 555, for example, via a screw or the like.

[0040] Next, the movable lens retaining frame 56 will be described. The movable lens retaining frame 56 is a cylindrical member (frame member) for retaining lenses 572 and 573 that constitute the third lens group 57A. The movable lens retaining frame 56 is disposed radially inward of the fixed lens retaining frame 55, with its outer periphery facing the inner periphery of the fixed lens retaining frame 55. The movable lens retaining frame 56 is disposed so as to protrude forward (toward the X1 side) in the optical axis direction (X direction) beyond the fixed lens retaining frame 55.

[0041] A standing wall 561 is provided on the front side (X1 side) of the movable lens holding frame 56 in the optical axis direction (X direction) so as to stand toward the outer diameter side, and an expanded diameter portion 562 is provided from the tip of the outer diameter side of the standing wall 561 toward the front side (X1 side). The standing wall 561 faces the above-mentioned standing wall 551 so as to form a gap S. A wave spring W1 (corresponding to an elastic member) is disposed in this gap S, and the wave spring W1 exerts a biasing force in a direction in which the standing wall 551 and the standing wall 561 move away from each other.

[0042] The expanded diameter portion 562 is located radially outward from a rear (X2 side) portion in the optical axis direction (X direction) of the movable lens holding frame 56 (referred to as a cylindrical portion 563). A male screw portion 564, which will be described later, is provided on the outer surface side of this expanded diameter portion 562.

[0043] Here, an annular flange portion 565 protrudes toward the outer diameter side on the front side (X1 side) of the expanded diameter portion 562 in the optical axis direction (X direction), and a gear portion 566, which will be described later, is formed on the outer peripheral surface located radially outside this annular flange portion 565.

[0044] (Regarding the adjustment mechanism) Next, the adjustment mechanism will be described. Fig. 5 is a perspective view showing the vicinity of fixed-side hole portion 512 of lens barrel 10 cut along a plane perpendicular to optical axis A1. In Fig. 5, outer cylinder 20 is omitted. The adjustment mechanism of this embodiment adjusts the distance between lens 571 and lenses 572 and 573. This adjustment mechanism includes fixed-side hole portion 512, cam-side hole portion 522, female thread portion 554 (corresponding to the inner peripheral engaging portion), male thread portion 564 (outer peripheral engaging portion), and gear portion 566 (corresponding to the drive transmission portion).

[0045] 3 to 5 , a fixed-side hole 512 is provided in a portion of the fixed barrel 51 that does not interfere with the guide groove 511, so as to penetrate the fixed barrel 51. Furthermore, a cam side hole 522 is provided in a portion of the cam barrel 52 that does not interfere with the cam groove 521, so as to penetrate the cam barrel 52. The fixed-side hole 512 and the cam side hole 522 are provided in positions where they overlap when the cam barrel 52 is rotated relative to the fixed barrel 51. In other words, by inserting an adjustment jig (described later) into the fixed-side hole 512 and the cam side hole 522, the adjustment jig can be caused to protrude into the cam barrel 52.

[0046] The position where the fixed side hole portion 512 and the cam side hole portion 522 overlap refers to a state where the inner tube side of the fixed tube 51 and the outer tube side of the cam tube 52 are connected via the fixed side hole portion 512 and the cam side hole portion 522 (the inner tube side of the fixed tube 51 can be seen from the outer tube side of the cam tube 52).

[0047] The fixed-side hole 512 has a slit-shaped long groove 512a and a shaft groove 512b in the longitudinal center of the long groove 512a. Similarly, the cam-side hole 522 has a slit-shaped long groove 522a and a shaft groove 522b in the longitudinal center of the long groove 522a. As shown in FIG. 4 , when the fixed-side hole 512 and the cam-side hole 522 overlap in a plan view, the adjustment gear 61 of the adjustment jig 60 is inserted into the long grooves 512a and 522a, and the rotating shaft 62 of the adjustment jig 60 is inserted into the shaft grooves 512b and 522b. In other words, the adjustment jig 60 can be inserted into both the cam-side hole 522 and the fixed-side hole 512.

[0048] 6 and 7, if the fixed-side hole 512 and the cam-side hole 522 do not overlap and are misaligned, the tip of the adjustment gear 61 of the adjustment jig 60 can be inserted into the cam-side hole 522, but the tip of the adjustment gear 61 will collide with the outer peripheral surface 51a of the fixed barrel 51 and will not be able to be inserted into the fixed-side hole 512. Note that FIG. 6 is a planar development of the zoom mechanism 50, and shows a state in which the lens 571 held via the moving frame 54 is positioned on the telephoto side. Also, FIG. 7 is a planar development of the zoom mechanism 50, and shows a state in which the lens 571 held via the moving frame 54 is positioned on the wide-angle side.

[0049] Such alignment of the fixed-side hole portion 512 and the cam-side hole portion 522 can be achieved by rotating the cam barrel 52 relative to the fixed barrel 51.

[0050] Next, the female thread portion 554 (corresponding to the inner peripheral engaging portion) and the male thread portion 564 (corresponding to the outer peripheral engaging portion) will be described. The female thread portion 554 is provided on the inner surface side of the enlarged diameter portion 552 of the fixed lens retaining frame 55 described above. Furthermore, the male thread portion 564 is provided on the outer surface side of the enlarged diameter portion 562 of the movable lens retaining frame 56 described above. The female thread portion 554 and the male thread portion 564 are threadedly coupled together. Therefore, when the movable lens retaining frame 56 is rotated relative to the fixed lens retaining frame 55 by the adjustment jig 60, the movable lens retaining frame 56 can move in the optical axis direction (X direction) relative to the fixed lens retaining frame 55. This allows adjustment of the distance between the lens 571 held by the fixed lens retaining frame 55 and the lenses 572 and 573 held by the movable lens retaining frame 56.

[0051] Furthermore, a gear portion 566 is provided on the outer peripheral surface of the annular flange portion 565 of the movable lens retaining frame 56. The gear portion 566 is a portion that meshes with an adjustment gear 61 of the adjustment jig 60, which will be described later, and when the adjustment gear 61 rotates, the gear portion 566 (movable lens retaining frame 56) rotates. This causes the movable lens retaining frame 56 to move in the optical axis direction (X direction) relative to the fixed lens retaining frame 55.

[0052] (Regarding the position fixing mechanism) A position fixing mechanism is provided in lens barrel 10 to fix the positions of fixed lens retaining frame 55 (lens 571) and movable lens retaining frame 56 (lenses 572, 573) after the adjustment of the distance between them using the adjustment mechanism described above is completed. This position fixing mechanism has first screw hole 543, second screw hole 556, fixing screw S1, fixed-side through-hole 513, and cam-side through-hole 523. Note that first screw hole 543 corresponds to the screw hole.

[0053] 3, the moving frame 54 is provided with a first screw hole 543 that passes through the cylindrical portion 541, and a fixing screw S1 is screwed into the first screw hole 543. Furthermore, the fixed lens holding frame 55 is provided with a second screw hole 556 that passes through the cylindrical portion 553, and the above-mentioned fixing screw S1 is screwed into the second screw hole 556.

[0054] The first screw hole 543 and the second screw hole 556 are aligned so that their positions in the optical axis direction (X direction) and the circumferential direction are the same. Therefore, when the fixing screw S1 is screwed into the first screw hole 543, the fixing screw S1 is also screwed into the second screw hole 556 and protrudes toward the inner diameter side of the cylindrical portion 553. The fixing screw S1 then abuts against the outer peripheral surface of the movable lens retaining frame 56. That is, after completing the optical performance evaluation described below, the fixing screw S1 is screwed into the first screw hole 543 and the second screw hole 556 and the tip of the fixing screw S1 abuts against the movable lens retaining frame 56, thereby fixing the positions of the fixed lens retaining frame 55 and the movable lens retaining frame 56 and preventing them from fluctuating. This fixes the relative positions of the lens 571 and the lenses 572 and 573.

[0055] The fixing screw S1 is preferably a set screw without a head. In this case, the fixing screw S1 does not protrude radially outward from the first screw hole 543. However, a screw with a head may also be used as the fixing screw S1.

[0056] 5, the fixed barrel 51 is formed with a fixed-side through-hole 513 that penetrates the fixed barrel 51. The above-mentioned fixing screw S1 and a tool for screwing in the fixing screw S1 are inserted into this fixed-side through-hole 513.

[0057] 5, the cam barrel 52 is formed with a cam-side through-hole 523 that penetrates the cam barrel 52, and the above-mentioned fixing screw S1 and a tool for screwing in the fixing screw S1 are also inserted into this cam-side through-hole 523. When the cam-side hole 522 is aligned with the fixed-side hole 512, the cam-side through-hole 523 is positioned so that it is on the same straight line as the first screw hole 543, the second screw hole 556, and the fixed-side through-hole 513. In other words, the position of the cam-side through-hole 523 is set so that when the cam barrel 52 is rotated to align the fixed-side hole 512 with the cam-side hole 522, the fixed-side through-hole 513 and the cam-side through-hole 523 are aligned.

[0058] Next, the adjustment jig 60 will be described. Fig. 8 is an exploded perspective view showing the configuration of the adjustment jig 60. As shown in Figs. 3, 5, and 8, the adjustment jig 60 has an adjustment gear 61, a rotation shaft 62, and a gear support portion 63. The adjustment gear 61 is a member that is rotatably supported by the rotation shaft 62 and that meshes with the gear portion 566 described above. Therefore, when the adjustment gear 61 rotates, the movable lens holding frame 56 can be rotated. In addition, the rotation shaft 62 is a shaft-shaped member that rotatably supports the adjustment gear 61.

[0059] The gear support portion 63 is a portion that rotatably supports the adjustment gear 61. The gear support portion 63 has a base portion 631, a shaft support portion 632, and a rod portion 633. The base portion 631 is a frame-shaped portion that has an elongated hole 631a into which the adjustment gear 61 can be inserted, and rotatably supports the adjustment gear 61 via the rotation shaft 62. Abutment protrusions 631b that protrude downward are provided on both longitudinal ends of the base portion 631, and these abutment protrusions 631b abut against the outer peripheral surface of the cam barrel 52. This prevents other portions of the base portion 631 from abutting against the outer peripheral surface of the cam barrel 52, allowing the adjustment gear 61 to rotate stably.

[0060] The pivot support portion 632 is a portion that protrudes further downward from the lower surface of the base portion 631 at the longitudinal center, and is a portion that is inserted into the above-mentioned shaft grooves 512b, 522b. The pivot support portion 632 is provided with a hole 632a into which the rotating shaft 62 is inserted. Therefore, the pivot support portion 632 rotatably supports the adjustment gear 61 via the rotating shaft 62.

[0061] 8, the rod portion 633 is a rod-shaped portion that protrudes downward from one of the pivotal support portions 632. The rod portion 633 may be provided completely separately from the one of the pivotal support portions 632. The rod portion 633 is fitted into a positioning recess 54a provided on the outer peripheral surface of the front side (X1 side) of the moving frame 54, and this fitting determines the relative position of the adjustment jig 60 in the circumferential direction of the moving frame 54.

[0062] [About the action] In the lens barrel 10 configured as described above, the distance between the lens 571 held in the fixed lens holding frame 55 and the lenses 572 and 573 held in the movable lens holding frame 56 can be adjusted from outside the lens barrel 10 using an adjustment jig 60.

[0063] That is, the cam barrel 52 is rotated relative to the fixed barrel 51 to position the fixed-side hole 512 and the cam-side hole 522 in communication (overlapping position). After that, the adjustment gear 61 of the adjustment jig 60 is inserted into the fixed-side hole 512 and the cam-side hole 522, and alignment is performed so that the rod portion 633 of the gear support portion 63 enters the positioning recess 54a of the moving frame 54.

[0064] In the above-described aligned state, the teeth of the adjustment gear 61 mesh with a gear portion 566 provided on the annular flange portion 565 of the movable lens retaining frame 56. That is, relative rotation between the fixed barrel 51 and the cam barrel 52 causes the movable lens retaining frame 56 to move in the optical axis direction (X direction) via the moving frame 54. Then, when the fixed-side hole portion 512 and the cam side hole portion 522 are positioned so as to communicate with each other, the gear portion 566 also overlaps with the fixed-side hole portion 512 and the cam side hole portion 522 in a direction perpendicular to the optical axis direction (X direction) (direction perpendicular to the optical axis). In addition, in this meshed state, the abutting protrusion 631b of the base portion 631 abuts against the outer circumferential surface of the cam barrel 52.

[0065] When the adjustment gear 61 is rotated in this meshed state, the screw action between the female screw portion 554 and the male screw portion 564 causes the movable lens retaining frame 56 to move in the optical axis direction (X direction) relative to the fixed lens retaining frame 55. This changes the distance (lens spacing) between the lenses 572 and 573 held in the movable lens retaining frame 56 and the lens 571 held in the fixed lens retaining frame 55. Therefore, after setting an appropriate lens spacing, optical performance evaluation such as various aberrations is evaluated. If readjustment of the lens spacing is necessary as a result, the adjustment gear 61 is rotated again to move the movable lens retaining frame 56 in the optical axis direction (X direction) relative to the fixed lens retaining frame 55.

[0066] The above adjustments are carried out until the optical performance evaluation falls within a predetermined standard. It is preferable to carry out such optical performance evaluation on both the wide-angle side and the telephoto side.

[0067] After completing the optical performance evaluation as described above, the fixing screw S1 is screwed into the first screw hole 543 and the second screw hole 556, and the tip of the fixing screw S1 is brought into contact with the movable lens retaining frame 56. This fixes the positions of the fixed lens retaining frame 55 and the movable lens retaining frame 56 and prevents them from fluctuating, thereby fixing the relative positions of the lens 571 and the lenses 572 and 573.

[0068] Furthermore, after screwing the fixing screw S1 into the first screw hole 543 and the second screw hole 556 and abutting the tip of the fixing screw S1 against the movable lens holding frame 56, it is preferable to block the cam side hole portion 522, the cam side through hole 523, etc. with, for example, tape or the like.

[0069] [About the effects] Lens barrel 10 configured as described above includes fixed barrel 51 in which guide groove 511 is formed along the optical axis direction (X direction) and into which cam follower 53 fits; cam barrel 52 which is rotatable relative to fixed barrel 51 and has cam groove 521 in which cam follower 53 fits and which is inclined with respect to the optical axis direction (X direction); zoom mechanism 50 which changes the focal length by moving third lens group 57A (movable lens group, adjustable movable lens group), which is at least one of the lens groups; and an adjustment mechanism which adjusts the position in the optical axis direction (X direction) of at least one lens 573 (optical element, first adjustable movable lens) which constitutes third lens group 57A (movable lens group, adjustable movable lens group), which is at least one of the lens groups.

[0070] The zoom mechanism 50 (moving mechanism) also includes a moving frame 54 (moving holding frame) to which a cam follower 53 is attached and which moves in the optical axis direction (X direction) in accordance with the relative rotation of the cam barrel 52 with respect to the fixed barrel 51, and a movable lens holding frame 56 which holds at least one lens 573 (optical element, second adjustment movable lens subgroup) of the third lens group 57A (moving lens group, adjustment movable lens group).

[0071] The adjustment mechanism includes a fixed side hole portion 512 that penetrates the fixed barrel 51, a cam side hole portion 522 that penetrates the cam barrel 52 and is aligned with the fixed side hole portion 512 when the cam barrel 52 rotates relative to the fixed barrel 51, a gear portion 566 (drive transmission portion) that is provided on the outer periphery of the movable lens retaining frame 56 and is in the same straight line as the fixed side hole portion 512 and the cam side hole portion 522 when they are aligned, a female screw portion 554 (inner peripheral engagement portion) that is formed on the inner periphery of the fixed lens retaining frame 55 (movable retaining frame), and a male screw portion 564 (outer periphery engagement portion) that is formed on the outer periphery of the movable lens retaining frame 56 in a state of engagement with the female screw portion 554 (inner peripheral engagement portion) and that, when an external force is transmitted in the rotational direction via the gear portion 566 (drive transmission portion), rotates relative to the female screw portion 554 (inner peripheral engagement portion), thereby moving the movable lens retaining frame 56 in the optical axis direction (X direction).

[0072] With this configuration, after the fixed-side hole portion 512 and the cam-side hole portion 522 are positioned in a communicating position (overlapping position), the adjustment gear 61 of the adjustment jig 60 is inserted from the outside into the fixed-side hole portion 512 and the cam-side hole portion 522, and the adjustment gear 61 of the adjustment jig 60 is engaged with the gear portion 566 (drive transmission portion). In this state, when the gear portion 566 (drive transmission portion) is rotated via the adjustment gear 61, the movable lens retaining frame 56 moves in the optical axis direction (X direction) relative to the fixed lens retaining frame 55 (movable retaining frame) due to the engagement between the female thread portion 554 (inner peripheral engaging portion). Therefore, it is possible to fine-tune the lens spacing of the third lens group 57A (movable lens group, adjustable movable lens group) by inserting an adjustment jig 60 from the outside through the fixed side hole portion 512 and the cam side hole portion 522 without disassembling the lens barrel 10.

[0073] Therefore, even if the optical performance evaluation after fine-tuning the lens spacing of third lens group 57A (moving lens group, adjustment movable lens group) does not fall within the predetermined standards, there is no need to disassemble lens barrel 10 to adjust the lens spacing of third lens group 57A (moving lens group, adjustment movable lens group). Also, since there is no need to disassemble lens barrel 10 and then adjust the lens spacing of third lens group 57A (moving lens group, adjustment movable lens group), the amount of work required to reassemble lens barrel 10 can be reduced, which also reduces the number of steps. Furthermore, when disassembling and assembling lens barrel 10, problems such as dust getting inside or scratches on the lenses can be prevented.

[0074] Furthermore, when gear portion 566 (drive transmission portion) is rotated via adjustment gear 61, the engagement between female thread portion 554 (inner peripheral engagement portion) and female thread portion 554 (inner peripheral engagement portion) causes movable lens retaining frame 56 to move in the optical axis direction (X direction) relative to fixed lens retaining frame 55 (movable retaining frame).This means that adjustment of the lens spacing of third lens group 57A (movable lens group, adjustable movable lens group) is no longer limited by the lineup of shims and washers, and fine adjustment of the lens spacing of, for example, 0.01 mm or less becomes possible.

[0075] Furthermore, since the lens spacing can be adjusted without disassembling lens barrel 10, it is possible to insert adjustment jig 60 from the outside via fixed side hole portion 512 and cam side hole portion 522 while viewing the projected image and measurement values ​​of lens barrel 10, and to perform fine adjustments to the lens spacing of third lens group 57A (movable lens group, adjustable movable lens group), and with a single fine adjustment, the optical performance evaluation can be brought within the specified standard.

[0076] In addition, in this embodiment, the third lens group 57A (adjustable movable lens group) has at least lens 571 (first adjustable movable lens subgroup) and lenses 572, 573 (second adjustable movable lens subgroup), and lens 571 (first adjustable movable lens subgroup) is held by fixed lens holding frame 55 (movable holding frame), and lenses 572, 573 (second adjustable movable lens subgroup) are held by movable lens holding frame 56.

[0077] This makes it possible to fine-tune the lens spacing between lens 571 (first adjustable movable lens subgroup) held in fixed lens holding frame 55 (movable holding frame) and lenses 572, 573 (second adjustable movable lens subgroup) held in movable lens holding frame 56.

[0078] Furthermore, in this embodiment, there is provided a position fixing mechanism that fixes the positions of the fixed lens retaining frame 55 and the movable lens retaining frame 56 after the adjustment of the distance between them by the adjustment mechanism is completed. The position fixing mechanism includes a first screw hole 543 (screw hole) that passes through a cylindrical portion 541 that the moving frame 54 (movable retaining frame) is provided with, a fixing screw S1 that is screwed into the first screw hole 543 (screw hole), a fixed-side through-hole 513 that passes through the fixed cylinder 51, through which the fixing screw S1 is inserted and that is on the same straight line as the first screw hole 543 (screw hole), and a cam-side through-hole 523 that passes through the cam cylinder 52, through which the fixing screw S1 is inserted and that is on the same straight line as the first screw hole 543, the second screw hole 556 and the fixed-side through-hole 513 when the cam-side hole 522 is aligned with the fixed-side hole 512.

[0079] Therefore, when the optical performance evaluation falls within a predetermined standard and adjustment of the lens spacing of third lens group 57A (adjustably movable lens group) is completed, fixing screw S1 can be inserted through fixed side hole portion 512 and cam side hole portion 522 and further screwed into first screw hole 543 (screw hole) to bring the tip of fixing screw S1 into contact with movable lens retaining frame 56. This makes it possible to fix the positions of fixed lens retaining frame 55 and movable lens retaining frame 56 and to make them unmovable, thereby fixing the relative positions of lens 571 and lenses 572 and 573.

[0080] In addition, in this embodiment, the fixed side through hole 513 is provided in a position that does not interfere with the fixed side hole portion 512, and the cam side through hole 523 is provided in a position that does not interfere with the cam side hole portion 522.

[0081] Therefore, even when the adjustment jig 60 is inserted into the fixed side hole portion 512 and the cam side hole portion 522, the fixing screw S1 can be inserted through the fixed side through hole 513 and the cam side through hole 523 and screwed into the first screw hole 543 (screw hole).

[0082] In this embodiment, the moving frame 54 is provided with a positioning recess 54a (positioning engagement portion) for positioning the adjustment jig 60 that is inserted from the outside.

[0083] Therefore, the adjustment jig 60 can be positioned appropriately relative to the gear portion 566. This makes it possible to easily adjust the lens spacing of the third lens group 57A (adjustable movable lens group).

[0084] In addition, in this embodiment, a wave spring W1 (elastic member) is arranged in the gap S between the fixed lens holding frame 55 (movable holding frame) and the movable lens holding frame 56, which urges the two components in a direction separating them from each other.

[0085] Therefore, even though the movable lens holding frame 56 is movable relative to the fixed lens holding frame 55 (movable holding frame), rattle can be prevented from occurring between the fixed lens holding frame 55 (movable holding frame) and the movable lens holding frame 56.

[0086] [Variations] Although one embodiment of the present invention has been described above, the present invention can be modified in various other ways, which will be described below.

[0087] In the above-described embodiment, a configuration has been described in which only one fixed-side hole 512 and one cam-side hole 522 are provided in the optical axis direction (X direction). However, a configuration in which multiple fixed-side holes 512 and multiple cam-side holes 522 are provided in the optical axis direction (X direction) may also be employed.

[0088] In this case, a set of fixed side holes 512 and cam side holes 522 can be provided, for example, on the wide-angle side and the telephoto side. This allows the moving frame 54, the fixed lens retaining frame 55, and the movable lens retaining frame 56 to be positioned on the wide-angle side, where optical performance can be evaluated while adjusting the lens spacing of the third lens group 57A (adjustable movable lens group). Furthermore, the moving frame 54, the fixed lens retaining frame 55, and the movable lens retaining frame 56 can be positioned on the telephoto side, where optical performance can be evaluated while adjusting the lens spacing of the third lens group 57A (adjustable movable lens group). This allows the optical performance to be within a predetermined standard on both the wide-angle side and the telephoto side without disassembling the lens barrel 10.

[0089] In addition, in this embodiment, the lens spacing between lens 571 (first adjustable movable lens subgroup) and lenses 572 and 573 (second adjustable movable lens subgroup) is adjusted by moving fixed lens holding frame 55 and movable lens holding frame 56 relative to each other. However, an adjustment mechanism similar to that of this embodiment may also be used to adjust the lens spacing of other lenses in third lens group 57A (adjustable movable lens group). Also, an adjustment mechanism similar to that of this embodiment may also be used to adjust, for example, the lens spacing in second lens group 43A of focus mechanism unit 40. This may change the focal length or the focus position.

[0090] Alternatively, all of the third lens group 57A (lenses 571, 572, 573) may be held in the movable lens holding frame 56, the fixed lens holding frame 55 may be omitted, and the position of the third lens group 57A relative to the entire optical system may be adjusted by an adjustment mechanism (adjusting the distance between the third lens group 57A and the lens group adjacent to the third lens group 57A in the optical axis direction).

[0091] In the above-described embodiment, lens barrel 10 is attached to an imaging device such as a camera body, and when lens barrel 10 is attached to the camera body, it constitutes an interchangeable lens camera. However, lens barrel 10 may also be attached to a camera body that does not allow for interchangeable lenses. Lens barrel 10 may also be attached to a separate optical device, such as a projection device, for example, a projector device.

[0092] Furthermore, in the above-described embodiment, the moving frame 54 is provided with a positioning recess 54a (positioning engagement portion) for positioning the adjustment jig 60 inserted from the outside. However, a positioning recess (positioning engagement portion) similar to the positioning recess 54a may be provided in the fixed lens holding frame 55. Note that the positioning engagement portion is not limited to a positioning recess, and may be a positioning protrusion.

[0093] Furthermore, in the above-described embodiment, the moving frame 54 and the fixed lens retaining frame 55 are described as separate components. However, the moving frame 54 and the fixed lens retaining frame 55 are integrated together both when moving in the optical axis direction (X direction) during zooming and when adjusting using the adjustment mechanism. Therefore, the fixed lens retaining frame 55 can be considered a part of the moving frame 54, and the moving frame 54 and the fixed lens retaining frame 55 may be a single component. For example, by connecting the front end (X1 side) of the moving frame 54 and the rear end (X2 side) of the fixed lens retaining frame 55, the two components can be molded as a single component. In this case, by integrating the cylindrical portion 541 of the moving frame 54 and the cylindrical portion 553 of the fixed lens retaining frame 55, these become a single cylindrical portion, eliminating the need for the first screw hole 543 formed in the cylindrical portion 541, and reducing the number of screw holes to one.

[0094] In the above embodiment, the drive transmission part is described as being gear part 566. However, the drive transmission part is not limited to a gear part, and may be, for example, a part having an uneven part on which the tip of a pin inserted from the outside can be caught.

[0095] Furthermore, in the above-described embodiment, the female thread portion 554 is described as the inner circumferential engaging portion, and the male thread portion 564 is described as the outer circumferential engaging portion. However, the inner circumferential engaging portion is not limited to the female thread portion 554, and the outer circumferential engaging portion is not limited to the male thread portion 564. For example, a spiral cam groove may be formed on the inner circumferential surface of the cylindrical portion 553, and this cam groove may be used as the inner circumferential engaging portion, and a cam follower may be formed on the outer circumferential surface of the cylindrical portion 563, and this cam follower may be used as the outer circumferential engaging portion. Furthermore, a cam follower may be formed on the inner circumferential surface of the cylindrical portion 553, and this cam follower may be used as the inner circumferential engaging portion, and a spiral cam groove may be formed on the outer circumferential surface of the cylindrical portion 563, and this cam groove may be used as the outer circumferential engaging portion.

[0096] In addition, in the above embodiment, the wave spring W1 is described as the elastic member, but the elastic member is not limited to the wave spring W1. For example, the elastic member may be an elastic body such as a coil spring or elastomer.

[0097] In the above-described embodiment, the lens barrel 10 is described as being attached to the camera body of a camera device, which is an example of an imaging device having an image sensor. However, imaging devices having an image sensor are not limited to camera devices. For example, various types of inspection equipment may also be used as imaging devices. Furthermore, an image display device having an image display element may be equipped with the lens barrel described above. In this case, a configuration in which the image display element is disposed on the telephoto side of the lens barrel according to the above-described embodiment may be adopted. [Explanation of symbols]

[0098] 10...lens barrel, 20...external barrel, 30...fixed lens portion, 31...fixed barrel, 32...lens holding frame, 33...lens, 33A...first lens group, 40...focus mechanism portion, 41...fixed barrel, 42...lens holding frame, 43...lens, 43A...second lens group, 44...moving frame, 50...zoom mechanism portion, 51...fixed barrel, 51a...outer periphery, 52...cam barrel, 53...cam follower, 54...moving frame, 54a...positioning recess, 55...fixed lens holding frame (corresponding to part of the moving holding frame) ), 56... movable lens holding frame (corresponding to part of the moving holding frame), 57A... third lens group (corresponding to the moving lens group and the adjustable moving lens group), 58... moving frame, 60... adjustment jig, 61... adjustment gear, 62... rotation shaft, 63... gear support portion, 431... lens, 511... guide groove, 512... fixed side hole portion, 512a... long groove portion, 512b... shaft groove portion, 513... fixed side through hole, 521... cam groove, 522... cam side hole portion, 522a... long groove portion, 522b... shaft groove portion, 523... Cam side through hole, 541... cylindrical portion, 542... flange portion, 543... first screw hole (corresponding to the screw hole), 551... standing wall, 552... enlarged diameter portion, 553... cylindrical portion, 554... female screw portion (corresponding to the inner peripheral engaging portion), 555... mounting flange portion, 556... second screw hole (corresponding to the screw hole), 561... standing wall, 562... enlarged diameter portion, 563... cylindrical portion, 564... male screw portion (corresponding to the outer peripheral engaging portion), 565... annular flange portion, 566... ​​gear portion (corresponding to the drive transmission portion), 571... lens (adjustment movement moving lens group and first adjustment moving lens subgroup), 572...lens (adjustment moving lens group and second adjustment moving lens subgroup), 573...lens (adjustment moving lens group, second adjustment moving lens subgroup and optical element), 581...flange portion, 631...base portion, 631a...long hole, 631b...contact protrusion, 632...bearing portion, 632a...hole portion, 633...rod portion, A1...optical axis, S...gap, S1...fixing screw, W1...wave spring (corresponding to elastic member)

Claims

1. A lens barrel that holds a lens system therein, the lens system having a plurality of lens groups each having one or more optical elements, a fixed barrel having a guide groove formed along the optical axis direction and into which a cam follower is inserted; a cam barrel provided rotatably relative to the fixed barrel, the cam barrel having a cam groove into which the cam follower is inserted and which is inclined with respect to the optical axis direction; a moving mechanism that moves at least one of the lens groups as a moving lens group in the optical axis direction to change the focal length or the focus position; an adjustment mechanism for adjusting the position of at least one of the optical elements constituting the adjustment movable lens group, which is at least one of the movable lens groups, in the optical axis direction; Equipped with The movement mechanism unit is a moving holding frame to which the cam follower is attached and which moves in the optical axis direction in accordance with the relative rotation of the cam barrel with respect to the fixed barrel; a movable lens holding frame that holds at least some of the optical elements of the moving lens group; Including, The adjustment mechanism includes: a fixed side hole portion passing through the fixed cylinder; a cam side hole portion that passes through the cam barrel and is aligned with the fixed side hole portion when the cam barrel rotates relative to the fixed barrel; a drive transmission portion provided on the outer circumferential side of the movable lens holding frame on the same straight line as the fixed-side hole portion and the cam-side hole portion when they are aligned; an inner peripheral engaging portion formed on an inner peripheral surface of the moving holding frame; an outer peripheral engaging portion formed on an outer peripheral surface of the movable lens holding frame in a state of engaging with the inner peripheral engaging portion, and which rotates relative to the inner peripheral engaging portion to move the movable lens holding frame in the optical axis direction when an external force is transmitted in a rotational direction via the drive transmitting portion; A lens barrel comprising:

2. 2. The lens barrel according to claim 1, the adjusting moving lens group has at least a first adjusting moving lens subgroup and a second adjusting moving lens subgroup; the first adjustment movable lens subgroup is held by the movable holding frame, the second adjustment movable lens subgroup is held by the movable lens holding frame; A lens barrel characterized by:

3. 3. The lens barrel according to claim 1, a position fixing mechanism for fixing the positions of the moving holding frame and the movable lens holding frame after the adjustment of the gap between them by the adjustment mechanism is completed; The position fixing mechanism includes: a screw hole passing through a cylindrical portion of the moving holding frame; a fixing screw that is screwed into the screw hole; a fixed-side through-hole that penetrates the fixed cylinder, through which the fixing screw is inserted, and that is on the same straight line as the screw hole; a cam-side through-hole that penetrates the cam cylinder, through which the fixing screw is inserted, and that is on the same straight line as the screw hole and the fixed-side through-hole when the cam-side hole portion is aligned with the fixed-side hole portion; A lens barrel comprising:

4. 4. The lens barrel according to claim 3, The fixed-side through-hole is provided at a position where it does not interfere with the fixed-side hole portion, The cam-side through-hole is provided at a position where it does not interfere with the cam-side hole portion. A lens barrel characterized by:

5. 5. The lens barrel according to claim 1, The movable holding frame is provided with a positioning engagement portion for positioning an adjustment jig inserted from the outside. A lens barrel characterized by:

6. 6. The lens barrel according to claim 1, An elastic member is disposed in the gap between the moving holding frame and the movable lens holding frame to bias the two members in a direction separating them from each other. A lens barrel characterized by:

7. 6. The lens barrel according to claim 5, a plurality of the fixed-side holes and the cam-side holes are provided at positions spaced apart in the optical axis direction; A lens barrel characterized by:

8. An imaging device comprising: the lens barrel according to claim 1; and an imaging element disposed on the telephoto side of the lens barrel.

9. 8. An image display device comprising: the lens barrel according to claim 1; and an image display element disposed on the telephoto side of the lens barrel.

Images