JP2010256568A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dust from entering a cylindrical member from a gap between the cylindrical member and a holding member which holds a lens therein and moves in the direction of an optical axis relatively to the cylindrical member, without blocking relative movement of the holding member. <P>SOLUTION: The lens barrel 1 includes: an external member 2; a first group lens-holding member 15 for holding a first lens group 11, which is disposed inside the exterior member 2 and configured so as to be movable in the direction of optical axis X relatively to the external member 2; and a flexible, annular dust-proof ring 6 disposed between the exterior member 2 and the first group lens-holding member 15. The one peripheral edge of the dust-proof ring 6 is attached to the exterior member 2; and the other peripheral edge thereof is attached to the first group lens-holding member 15. Thus, the dust-proof ring 6 fills the gap between the external member 2 and first group lens-holding member 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens barrel.

  2. Description of the Related Art Conventionally, in a lens barrel, a frame-like member or a cylindrical member that holds a lens directly or indirectly is moved in the optical axis direction in order to move the lens in the optical axis direction. Yes.

  In the lens barrel according to Patent Document 1, a distance ring is provided inside the fixed outer cylinder. A lens holding frame is supported on the distance ring so as to be movable in the optical axis direction and not rotatable. A lens is held on the lens holding frame. Thus, the lens is indirectly held on the distance ring via the lens holding frame. When the distance ring moves in the optical axis direction with respect to the fixed outer cylinder, the lens holding frame also moves in the optical axis direction together with the distance ring, and the lens moves in the optical axis direction.

  In such a configuration, there is a problem that dust enters the lens barrel through a gap between the inner peripheral surface of the fixed outer cylinder and the outer peripheral surface of the distance ring. A drive mechanism such as a cam mechanism or a screw mechanism for moving a distance ring or the like is disposed inside the fixed outer cylinder. If dust enters these sliding portions, the movement of the distance ring or the like will deteriorate. There is a fear. Alternatively, dust that has entered the inside of the fixed outer cylinder may adhere to the lens. Such dust cannot be removed unless the lens barrel is disassembled, and cannot be easily removed by the user.

  Therefore, in the lens barrel according to Patent Document 1, an annular dust-proof ring is provided along the inner peripheral surface of the fixed outer cylinder. This prevents dust from entering the inside of the fixed outer cylinder through the gap between the inner peripheral surface of the fixed outer cylinder and the outer peripheral surface of the distance ring.

Japanese Utility Model Publication No. 62-197115

  However, in the lens barrel according to Patent Document 1, the dust-proof ring is provided on the fixed outer cylinder side, and a slight gap is provided between the dust-proof ring and the outer peripheral surface of the distance ring. By doing so, the dust-proof ring and the distance ring come into contact with each other to prevent friction. Therefore, with such a configuration, it is not possible to completely prevent the intrusion of dust.

  On the other hand, if the dust-proof ring and the outer peripheral surface of the distance ring are brought into contact with each other to completely prevent the intrusion of dust, a frictional force is generated between the dust-proof ring and the distance ring. Or, there is a possibility that the center of the distance ring may be displaced from the optical axis when the distance ring moves in the optical axis direction due to the influence of the fixed outer cylinder in which the dustproof ring is provided.

  The technology disclosed herein has been made in view of such a point, and an object thereof is between a cylindrical member and a holding member that holds a lens therein and relatively moves in the optical axis direction. It is to prevent the dust from entering the cylindrical member without disturbing the relative movement of the holding member.

  The lens barrel disclosed herein is a lens barrel configured such that the lens can be moved in the optical axis direction. The lens barrel is disposed on the inner side of the cylindrical member and the cylindrical member. A holding member configured to be relatively movable in the optical axis direction, and holding a lens; and a flexible annular dustproof member provided between the cylindrical member and the holding member. The dust-proof member has one peripheral edge attached to the cylindrical member and the other peripheral edge attached to the holding member to block the gap between the cylindrical member and the holding member.

  According to the lens barrel, since the gap between the cylindrical member and the holding member is closed by the dust-proof member, it is possible to prevent dust from entering the cylindrical member. And even if it is the structure which attaches a dust-proof member to both a cylinder member and a holding member, it prevents that a dust-proof member obstructs relative movement of a holding member by giving flexibility to this dust-proof member. can do.

It is a perspective view of the lens barrel concerning this embodiment. It is a schematic sectional view showing a schematic configuration of a lens barrel. It is a front view of a lens barrel. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3 of the lens barrel in a wide-angle shooting state. FIG. 5 is a cross-sectional view of the lens barrel in the wide-angle shooting state taken along line VV in FIG. 3. It is a perspective view from diagonally backward of a dustproof ring. It is a perspective view from the diagonal front of a dustproof ring. FIG. 4 is a cross-sectional view of the lens barrel in the telephoto state, taken along line IV-IV in FIG. 3.

  Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a lens barrel, and FIG. 2 is a schematic cross-sectional view showing a schematic configuration of the lens barrel.

  The lens barrel 1 according to the present embodiment includes an exterior member 2, and a first group lens 11, a second group lens 12, a third group lens 13, and a fourth group lens 14 disposed inside the exterior member 2. The first group lens 11 is the first group lens holding member 15, the second group lens 12 is the second group lens holding member 16, the third group lens 13 is the third group lens holding member 17, and the fourth group lens 14 is the fourth group lens holding member 18. Are held respectively. The first to third group lens holding members 15 to 17 are configured to perform relative linear movement in the direction of the optical axis X and relative rotation about the optical axis X in conjunction with each other by a cam mechanism or a screw mechanism. Yes. Thus, the first group lens 11, the second group lens 12, and the third group lens 13 are configured so that the positions in the optical axis X direction can be interlocked with each other inside the exterior member 2.

  Next, the exterior member 2 will be described with reference to FIGS. FIG. 3 is a front view of the lens barrel 1 (that is, a view seen from the optical axis X direction), and FIG. 4 is a cross-sectional view of the lens barrel in the wide-angle shooting state taken along the line IV-IV in FIG. FIG. 5 is a cross-sectional view of the lens barrel in the wide-angle shooting state taken along the line V-V in FIG. The exterior member 2 includes a lens base 21 attached to a camera body (not shown) and a lens hood 22 provided on the subject side of the lens base 21. This exterior member 2 constitutes a cylindrical member. Hereinafter, the subject side is also referred to as the front side, and the camera body side is also referred to as the rear side.

  The lens base 21 is a cylindrical member. A lens hood 22 is attached to the front end surface of the lens base 21. A focus ring 23 and a zoom ring 24 are fitted on the outer peripheral surface of the lens base 21. The focus ring 23 and the zoom ring 24 are configured independently of each other so as to be rotatable with respect to the lens base 21. By rotating at least one of the focus ring 23 and the zoom ring 24, all or part of the first group lens 11, the second group lens 12, and the third group lens 13 are moved in the optical axis X direction, and each lens is desired. It can arrange | position to the optical axis X direction position.

  The lens hood 22 is a cylindrical member having a larger diameter than the lens base 21. The rear end portion of the lens hood 22 is formed with a tapered portion 22a that is tapered toward the rear end edge. A flange 22b that protrudes radially inward is formed on the rear end edge of the lens hood 22, that is, the rear end edge of the tapered portion 22a. This flange 22 b is attached to the front end surface of the lens base 21. Specifically, the flange 22 b of the lens hood 22 is screwed in a state where the dust-proof O-ring 25 is sandwiched between the front end surface of the lens base 21. Further, on the inner peripheral side of the taper portion 22a, a step portion 22c provided in an annular shape over the inner periphery of the taper portion 22a is formed. A mounting surface 22d for mounting a dustproof ring 6 to be described later is formed on the front surface of the step portion 22c. That is, the normal direction of the mounting surface 22d is formed to be parallel to the optical axis X. A plurality of screw holes 22e (only one is shown in FIG. 5) for screwing the dust-proof ring 6 are formed in the mounting surface 22d at intervals in the circumferential direction. Further, an arcuate meat stealing portion 22f is formed in a portion of the mounting surface 22d between the screw hole 22e and the screw hole 22e.

  Next, the configuration of the first group lens holding member 15 will be described.

  The first group lens holding member 15 includes a first group lens frame 3 to which the first group lens 11 is attached, and a first group holder 4 to which the first group lens frame 3 is attached. The first group lens holding member 15 constitutes a holding member.

  The first group lens frame 3 includes a cylindrical main body 30 that has a reduced diameter from the front to the rear, and a flange 31 that is provided at the front end of the main body 30 and extends radially outward from the main body 30. have. A plurality of annular steps are formed on the inner peripheral surface of the main body 30.

  The first group lens 11 includes an L1 lens 11a, an L2 lens 11b, an L3 lens 11c, an L4 lens 11d, and an L5 lens 11e. The L4 lens 11d, the L3 lens 11c, the L2 lens 11b, and the L1 lens 11a are inserted into the first group lens frame 3 in this order from the front side, and are installed at corresponding steps in the first group lens frame 3. After the L1 lens 11a is installed in the first group lens frame 3, the lens pressing member 37 is screwed to the front end portion of the main body 30 from the front side. As a result, the L1 lens 11a, the L2 lens 11b, the L3 lens 11c, and the L4 lens 11d are fixed to the first group lens frame 3. On the other hand, the L5 lens 11 e is inserted into the first group lens frame 3 from the rear side, and is installed at a corresponding step in the first group lens frame 3. Thus, the L1 lens 11a, L2 lens 11b, L3 lens 11c, L4 lens 11d, and L5 lens 11e arranged in the first group lens frame 3 are arranged in this order from the front to the rear.

  Three through holes 32 through which screws 34 are inserted when the first group lens frame 3 is screwed to the first group holder 4 are formed in the flange 31 at intervals in the circumferential direction (1 in FIG. 5). Only one is shown). Further, the flange 31 is formed with six notches 33, 33,... For performing a work for attaching a dustproof ring 6 to be described later at intervals in the circumferential direction. Each notch 33 is formed to open outward in the radial direction of the flange 31 and to penetrate the flange 31 in the thickness direction.

  The first group holder 4 includes a cylindrical main body 40 and a flange 41 that is provided at the front end of the main body 40 and extends outward in the radial direction from the main body 40. The first group holder 4 is connected to the second group to fourth group lens holding members 16 to 18 via a cam mechanism or the like, and rotates the optical axis X by rotating at least one of the focus ring 23 and the zoom ring 24. It is configured to move straight in the direction.

  On the outer peripheral surface of the main body 40, a protrusion 40 a that protrudes radially outward is formed in the vicinity of the flange 41 along the circumferential direction. An engaging claw 63a of a dustproof ring 6 described later is engaged with the protrusion 40a.

  The flange 41 is formed in the same ring shape as the flange 31. The flange 41 is formed with three screw holes 42 at intervals in the circumferential direction (only one is shown in FIG. 5). A female screw is processed in the screw hole 42. The screw holes 42 are formed at positions corresponding to the three through holes 32 of the flange 31. Further, similarly to the flange 31, the flange 41 is formed with six notches 43 for carrying out the attaching operation of the dustproof ring 6 at intervals in the circumferential direction (only one is shown in FIG. 5). Each notch 43 is formed to open outward in the radial direction of the flange 41 and to penetrate the flange 41 in the thickness direction. When the flange 31 and the flange 41 are overlapped with each other, the cutout portions 33 and 43 are formed so as to overlap each other.

  The flange 31 of the first lens group frame 3 is attached to the flange 41 configured as described above. The flange 31 and the flange 41 are screwed with a screw 34 in a state of being overlapped. At this time, a leaf spring 35 is sandwiched between the head of the screw 34 and the front surface of the flange 31. The leaf spring 35 has a screw holding portion 35a through which the screw 34 passes and two leg portions 35b and 35b extending from the screw holding portion 35a. Each leg portion 35b is formed with a positioning hole 35c into which a positioning pin 36 provided on the front surface of the flange 31 is fitted. More specifically, the positioning hole 35c of one leg portion 35b has a circular shape similar to that of the positioning pin 36, and the positioning hole 35c of the other leg portion 35b is long enough to fit the positioning pin 36. It has a hole shape. The screw holding portion 35a protrudes to the front side from the tip portions of the leg portions 35b and 35b. The plate spring 35 configured as described above is installed on the front surface of the flange 31 so that the positioning holes 35c and 35c fit into the positioning pins 36 and 36, respectively. Then, the screw 34 is inserted into the through hole of the screw holding portion 35 a and the through hole 32 of the flange 31 and screwed into the screw hole 42 of the flange 41. Then, by tightening the screw 34, the screw holding portion 35a of the leaf spring 35 is brought close to the flange 31, and the flange 31 is pressed against the flange 41 by the elastic force of the leg portions 35b, 35b of the leaf spring 35. Thus, with the flange 31 temporarily fixed to the flange 41 by the elastic force of the leaf spring 35, the mounting state of the flange 31 is adjusted, and finally the flange 31 is fixed to the flange 41 with the screw 34. An O-ring 38 is sandwiched between the flange 31 and the flange 41.

  A gap for preventing contact between the first group lens holding member 15 and the exterior member 2 during relative movement is formed between the first group lens holding member 15 and the exterior member 2 thus configured. . In this embodiment, the dust-proof ring 6 is provided so that dust does not enter the interior of the exterior member 2 from this gap.

  Hereinafter, the dustproof ring 6 will be described with reference to FIGS. 6 is a perspective view of the dust-proof ring 6 from obliquely rearward, FIG. 7 is a perspective view of the dust-proof ring 6 from obliquely forward, and FIG. 8 is a cross-section when the lens barrel is in a telephoto state. FIG.

  The dust-proof ring 6 includes an annular rubber rubber 61 formed in an annular shape and a metallic metal ring 62 formed in an annular shape. The dust-proof ring 6 constitutes a dust-proof member, the annular rubber 61 constitutes a main body, and the metal ring 62 constitutes a pressing member.

  The annular rubber 61 has a relatively small diameter tubular portion 63, a relatively large diameter flange 64, and a flexible portion 65 that connects the tubular portion 63 and the flange 64. The cylindrical portion 63 is formed in a cylindrical shape that extends in the optical axis X direction. An engaging claw 63 a that protrudes inward is formed on the entire periphery of the tip of the cylindrical portion 63. The inner diameter of the engaging claw 63 a is set to a value slightly smaller than the outer diameter of the main body 40 of the first group holder 4. The flange 64 is a flat plate-like member, and is formed in an annular shape around the optical axis X. The normal direction of the front surface and the rear surface of the flange 64 is parallel to the optical axis X. The flange 64 is formed with six notches 64a, 64a,... Opening outward in the radial direction at intervals in the circumferential direction. The positions of these notches 64a, 64a,... Correspond to the positions of through holes 62a, 62a,. Further, a rib 64b protruding rearward is formed on the rear surface of the flange 64 in an annular shape over the entire circumference. The flexible part 65 is an annular member, and one peripheral part is connected to the rear end peripheral part of the cylindrical part 63, and the other peripheral part is connected to the inner peripheral part of the flange 64.

  The metal ring 62 has the same shape as the flange 64 of the annular rubber 61. That is, the metal ring 62 is a flat plate-like member and is formed in an annular shape with the optical axis X as the center. The normal direction of the front surface and the rear surface of the metal ring 62 is parallel to the optical axis X. The outer diameter and inner diameter of the metal ring 62 substantially match the outer diameter and inner diameter of the flange 64, respectively. In the metal ring 62, six through holes 62a, 62a,... Through which screws pass when attaching the dustproof ring 6 to the lens hood 22 with screws are formed in the circumferential direction. The metal ring 62 is attached to the front surface of the flange 64. At this time, the through holes 62a, 62a,... Of the metal ring 62 are located at the positions of the notches 64a, 64a,.

  Next, attachment of the dustproof ring 6 will be described.

  First, the cylindrical portion 63 of the annular rubber 61 is attached to the main body portion 40 of the first group holder 4 before the first group lens holding member 15 is assembled into the exterior member 2. Specifically, the tubular portion 63 is inserted from the rear of the main body portion 40. At this time, since the inner diameter of the cylindrical portion 63 is smaller than the outer diameter of the main body portion 40, the insertion operation may be performed in a state where the inner diameter of the cylindrical portion 63 is widened using a jig, or the cylindrical portion 63. The insertion operation may be performed in a state where the inner diameter of the operator is widened. The tubular portion 63 is inserted until the engaging claw portion 63a of the tubular portion 63 gets over the protruding portion 40a of the main body portion 40. By engaging the engaging claw 63a with the protrusion 40a in this way, the attachment of the dustproof ring 6 to the first group holder 4 is completed. At this time, the dust-proof ring 6 is attached to the first group holder 4 so that the notch 33 of the flange 31 and the notch 43 of the flange 41 and the through hole 62a of the metal ring 62 are aligned in the optical axis X direction. As a result, the through hole 62 a of the metal ring 62 can be seen from the front through the notch 33 of the flange 31 and the notch 43 of the flange 41.

  In this way, the first group lens holding member 15 is incorporated into the exterior member 2 with the dust ring 6 attached to the first group holder 4. At this time, by adjusting the angle of the exterior member 2 with respect to the first group lens holding member 15, the notch 33 of the flange 31, the notch 43 of the flange 41, the through hole 62 a of the metal ring 62, and the screw hole of the lens hood 22. 22e are arranged in the optical axis X direction. Here, since the through hole 62a of the metal ring 62 is exposed to the front through the notch 33 of the flange 31 and the notch 43 of the flange 41, the screw 67 is connected to the notch 33 of the flange 31 and the flange 41. The dust-proof ring 6 can be screwed to the mounting surface 22 d of the lens hood 22 by inserting the through-hole 62 a of the metal ring 62 and the screw hole 22 e of the lens hood 22 from the front through the notch 43. In this way, the dust-proof ring 6 is attached to the lens hood 22 so that the flange 64 is sandwiched between the metal ring 62 and the attachment surface 22 d of the lens hood 22. At this time, the rib 64b formed on the rear surface of the flange 64 is pressed against the mounting surface 22d and is compressed and deformed. Thereby, the sealing performance between the dust-proof ring 6 and the lens hood 22 is improved. Finally, as shown in FIG. 1, the first group frame decorative ring 15a is attached to the front surface of the first group lens frame 3, and the notch 33, the screw 34, and the leaf spring 35 are not visible from the front. . However, in FIG. 3, the illustration of the first group frame decorative ring 15a is omitted.

  Thus, the dust-proof ring 6 is attached to the first group lens holding member 15 and the exterior member 2 (specifically, attached to the first group holder 4 and the lens hood 22). The gap between is closed. Since the dust-proof ring 6 has flexibility, when the first group lens holding member 15 moves relative to the exterior member 2 in the optical axis X direction, the relative movement is not hindered. Specifically, when the lens barrel 1 is in the wide-angle shooting state, the flexible portion 65 is relatively bent as shown in FIG. 4, and when the lens barrel 1 is in the telephoto shooting state, as shown in FIG. In addition, the flexible portion 65 of the dustproof ring 6 is relatively extended.

  Therefore, according to the present embodiment, by providing the dust-proof ring 6 between the exterior member 2 and the first group lens holding member 15 that moves relative to the exterior member 2 in the optical axis X direction, It is possible to prevent dust from entering the exterior member 2 from the gap between the second lens group 1 and the first group lens holding member 15. In addition, by configuring the dust-proof ring 6 with a flexible member, the relative movement of the first group lens holding member 15 with respect to the exterior member 2 can be prevented from being hindered.

  Further, even if the flange 64 of the dust-proof ring 6 is a member having flexibility such as the annular rubber 61 by being attached in a state where it is pressed by the metal ring 62 having higher rigidity than the flange 64, the flange 64 It can be attached with a uniform pressing force as much as possible. That is, the flexible portion 65 of the dust-proof ring 6 is deformed following the movement of the first group lens holding member 15, but at that time, the flexible portion 65 receives some tension due to the movement of the first group lens holding member 15. appear. When the flange 64 is attached only by the plurality of screws 67, since the flange 64 has flexibility, a portion of the flange 64 where the screw is not located may be separated from the attachment surface 22d by this tension. In particular, since the rear surface of the flange 64 and the mounting surface 22d of the lens hood 22 face the optical axis X direction, which is the moving direction of the first group lens holding member 15, when the first group lens holding member 15 moves, When the first group lens holding member 15 moves forward and extends from a state where the flexible portion 65 is bent, the tension of the flexible portion 65 acts on the flange 64 so that the flange 64 is separated from the mounting surface 22d. To do. On the other hand, the tension of the flexible portion 65 acts on the flange 64 by attaching the flange 64 to the attachment surface 22d so as to press the entire circumference of the flange 64 with the metal ring 62 having higher rigidity than the flange 64. Even if it is a case, it can prevent that the flange 64 is pulled apart from the attachment surface 22d, and can ensure the sealing performance between the flange 64 and the attachment surface 22d.

  Further, by providing the rib 64b on the rear surface of the flange 64, that is, the surface in contact with the mounting surface 22d, when the flange 64 is mounted on the mounting surface 22d, the rib 64b is compressed and deformed, and the flange 64 and the mounting surface 22d. The sealing property can be further ensured.

  Furthermore, by attaching the flange 64 to the attachment surface 22d, which is a surface facing the optical axis X direction, the attachment of the dustproof ring 6 can be easily realized without impairing the aesthetics of the lens barrel 1. That is, after attaching the exterior member 2, when it is necessary to attach the dustproof ring 6 by applying the tool from the radial direction, a hole or the like for passing the tool must be formed on the outer peripheral surface of the exterior member 2. Therefore, the beauty of the exterior member 2 is impaired. Even if a member for covering the hole is separately attached, providing another member is not preferable because it restricts the design of the exterior member 2. On the other hand, when a tool is inserted from the front of the exterior member 2, there is a gap between the first group lens frame 3 and the exterior member 2, and the tool is inserted into the first group lens frame 3 or the like. Even if a member (specifically, the first group frame decorative ring 15a) that forms a notch and covers the notch is separately attached, the front end of the first group lens holding member 15, that is, the flange of the first group lens frame 3 is attached. Since 31 is covered with the exterior member 2, it does not stand out so much. That is, the configuration in which the tool is inserted from the front of the exterior member 2 is easier to process the portion through which the tool is inserted than the configuration in which the tool is inserted from the outside in the radial direction of the exterior member 2. It is preferable in terms of aesthetics. Therefore, by attaching the flange 64 to the surface facing the optical axis X, it is possible to adopt a configuration in which a tool is inserted from the front of the exterior member 2, and as a result, the dust-proof ring 6 can be obtained without impairing the aesthetic appearance of the lens barrel 1. Can be easily realized.

  Further, by attaching the cylindrical portion 63 to the outer peripheral surface of the main body portion 40 which is a surface facing the direction orthogonal to the optical axis X, the outer periphery of the cylindrical portion 63 and the main body portion 40 is relatively moved when the first group lens holding member 15 is moved It is possible to prevent the sealing performance between the surfaces from deteriorating. That is, even if tension is generated in the flexible portion 65 due to the movement of the first group lens holding member 15, the direction in which the cylindrical portion 63 and the main body portion 40 are opposed is the light in which the first group lens holding member 15 moves. Since the direction is perpendicular to the direction of the axis X, the tension acts on the cylindrical portion 63 so that the cylindrical portion 63 slides along the optical axis X. That is, since the tension of the flexible portion 65 does not act in the direction of pulling the tubular portion 63 away from the outer peripheral surface of the main body portion 40, the sealing performance between the cylindrical portion 63 and the outer peripheral surface of the main body portion 40 is ensured. Can do.

<< Other Embodiments >>
The present invention may be configured as follows with respect to the above embodiment.

  Although the flange 64 is formed in one peripheral part of the said cyclic | annular rubber | gum 61 and the cylindrical part 63 is formed in the other peripheral part, it is not restricted to this. In the embodiment, a configuration in which a flange portion is formed at a peripheral portion where the cylindrical portion 63 is formed and a cylindrical portion is formed at a peripheral portion where the flange 64 is formed may be employed. Moreover, the structure by which a flange part is formed in both peripheral parts may be sufficient. Further, the flange portion may project not only outward in the radial direction but also inward in the radial direction.

  Moreover, although the flange 64 is attached by the metal ring 62, it is not restricted to this. For example, the metal ring 62 may be omitted and the flange 64 may be directly screwed. Or the structure attached in the state which pressed the flange 64 with the members of higher rigidity than the flange 64 other than the metal ring 62, for example, the ring-shaped member comprised with hard resin etc. may be sufficient. Further, the pressing member such as the metal ring 62 is not necessarily separate from the annular rubber 61 and may be integrally formed by insert molding or the like. Further, the flange 64 may be formed of a member having higher rigidity than the flexible portion 65.

  Further, the tubular portion 63 of the annular rubber 61 is attached to the main body portion 40 by engaging the engaging claw portion 63a with the projection portion 40a of the main body portion 40, but is not limited thereto. . For example, in addition to the engagement between the engagement claw 63a and the protrusion 40a, the tubular portion 63 may be attached to the main body 40 by tightening the tubular portion 63 from the outside with a belt-like member. Good. Or the structure which attaches the cylindrical part 63 to the main-body part 40 only by this belt-shaped member, without providing the engagement nail | claw part 63a and the projection part 40a may be sufficient.

  The dust-proof ring 6 is attached to the first group holder 4 of the first group lens holding member 15, but is not limited thereto. The structure which attaches the dustproof ring 6 to the 1st group lens frame 3 may be sufficient. The first group lens holding member 15 does not need to be configured by the first group lens frame 3 and the first group lens holder 4, and may be a single member.

  Further, the dust-proof ring 6 is provided between the exterior member 2 and the first group lens holding member 15, but this is an example. Even if the dust-proof ring 6 is other than the exterior member 2 and the first group lens holding member 15, the dust-proof ring 6 is disposed inside the cylindrical member and is configured to be relatively movable in the optical axis direction with respect to the cylindrical member. It may be configured to be attached to a holding member that holds the lens. Here, “holding the lens” does not matter whether the lens is held directly or indirectly through another member.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for a lens barrel that includes a cylindrical member and a holding member that holds a lens therein and relatively moves in the optical axis direction.

X Optical axis 1 Lens barrel 11 First lens group (lens)
15 1st lens holding member (holding member)
2 Exterior member (cylinder member)
6 Dust-proof ring (dust-proof material)
61 Ring rubber (main part)
62 Metal ring (holding member)
64 flange 64b rib

Claims (5)

A lens barrel configured to move the lens in the optical axis direction;
A tubular member;
A holding member for holding a lens, which is disposed inside the cylindrical member and configured to be relatively movable in the optical axis direction with respect to the cylindrical member;
An annular dustproof member having flexibility provided between the cylindrical member and the holding member;
The dust-proof member is a lens barrel in which one peripheral edge portion is attached to the cylindrical member and the other peripheral edge portion is attached to the holding member to close a gap between the cylindrical member and the holding member. The lens barrel according to claim 1,
The dust-proof member includes an annular main body portion having a flexible structure in which one peripheral edge portion is attached to the cylindrical member and the other peripheral edge portion is attached to the holding member, and an annular body having higher rigidity than the main body portion. A holding member,
A flange is formed on at least one peripheral edge of the main body,
The lens barrel in which the pressing member is attached to the cylindrical member or the holding member with the peripheral edge pressed with the flange pressed. The lens barrel according to claim 2,
A lens barrel that is attached to a surface of the main body, which is attached via the flange, on a surface orthogonal to the optical axis. In the lens barrel according to claim 2 or 3,
A lens barrel in which the flange is provided with a rib that comes into contact with the mounting surface at the time of mounting and compresses and deforms at a position in contact with the mounting surface of the cylindrical member or the holding member. The lens barrel according to claim 1,
A lens barrel that is attached to a surface of the peripheral edge of the dust-proof member that is attached to the holding member and that faces in a direction perpendicular to the optical axis of the holding member.

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