JP2012163690A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome a problem, in bayonet coupling generally employed between a moving cam ring and a rectilinear barrel respectively provided with a projection portion and a groove portion for moving these components integrally and rotatably along an optical axis, in which although it is necessary to change the shape of the projection portion in a radial direction or a circumferential direction and to make an introducing portion have an according shape for avoiding the bayonet coupling from releasing even when the moving cam ring is rotated against the rectilinear barrel in a phase other than an assembling phase, enlargement of the shape of the projection portion in the radial direction in particular is a factor to inhibit downsizing of a camera.SOLUTION: A projection portion of a rectilinear barrel used for bayonet coupling between a moving cam ring and the rectilinear barrel is divided along a circumferential direction, and a projection is provided on the moving cam ring side in a position where a divided portion of the projection portion passes in integrating the rectilinear barrel with the moving cam ring in an optical axis direction in an assembling phase. Thus, even when the moving cam ring is rotated to the very limit of the assembling phase, engagement of the bayonet coupling may be large and an angle of rotation may be secured as large as possible.

Description

  The present invention relates to a lens barrel provided in a film camera, a digital camera, or the like.

  2. Description of the Related Art Conventionally, a lens barrel having a zoom mechanism that moves a plurality of optical lenses in the optical axis direction to change a photographing magnification is known. For example, a lens holding frame for holding a lens is engaged with a cam groove of a rotating cam cylinder, and the rotation of the lens holding frame is restricted by a straight advance cylinder and moved to the optical axis. The cam cylinder and the rectilinear cylinder are provided with a groove on the inner periphery of the cam cylinder and a protrusion entering the groove of the cam cylinder on the outer periphery of the rectilinear cylinder, and are connected to the bayonet so that the cam cylinder can rotate with respect to the rectilinear cylinder. Those that advance and retract in the axial direction are generally used. Such a bayonet-coupled component always has a built-in phase for incorporating each other's components, and a technique for increasing the degree of freedom of the cam barrel rotation angle by devising the built-in phase and the amount of bayonet is disclosed. Yes.

  For example, in Patent Document 1, as shown in FIG. 11, the lengths in the radial direction and the circumferential direction of the plurality of bayonet protrusions 28a to 28c are changed, and the cutouts 14a to 14a matched to the shape of the protrusions in the built-in phase. 14c is provided. Therefore, even if the cam cylinder rotates and the protrusion reaches a notch different from the built-in phase, either the radial direction or the circumferential direction is applied, so that the bayonet connection is not released.

  In addition, in the bayonet coupling having three projections equally divided at an angle that does not require the cam cylinder to be rotated at a rotation angle of 120 ° or more as shown in FIG. 3, the radial length and the circumferential direction of each bayonet projection Are known to have the same length.

JP-A-11-160606

  In Patent Document 1, since the radial lengths of a plurality of bayonet protrusions are changed, a dimension sufficient to form the longest bayonet protrusion in the radial direction is required in the radial direction of the lens barrel, and the camera is downsized. It was an obstacle.

  Further, in the bayonet connection using three protrusions that do not need to rotate more than 120 °, it is not necessary to change the shape of the bayonet protrusions. However, if the built-in phase introduction position is used as far as possible, the amount of engagement in the circumferential direction is reduced and the bayonet coupling may be disconnected. In order to prevent the disengagement, it is necessary to maintain a certain amount of engagement, and the rotation angle of the cam cylinder has to be reduced so as not to rotate the vicinity of the introduction position. When the rotation angle is small, the cam lift may stand and the lens barrel load may increase.

  In order to solve the above problems, the lens barrel of the present technical idea is formed with a lens holding unit that holds the lens and moves in the optical axis direction, and a cam groove that defines the movement of the lens holding unit in the optical axis direction. The movable cam ring, a rectilinear groove that regulates the rotational direction of the lens holding unit, and a protrusion that engages with the groove formed in the movable cam ring, and is disposed inside the movable cam ring. The groove portion is located at a different position in the optical axis direction and has a first region formed with a first length around the optical axis as an engagement region with the protrusion. A second region formed with a length of 2, the first region and the second region are connected by an inclined portion, and the protrusion engaging with the groove is the first region. Or the second length, whichever is shorter The moving cam ring is provided with a protrusion that passes through a gap between the plurality of protrusions divided into the plurality of protrusions that are introduced into the plurality of protrusions in the optical axis direction. ing.

  According to the present invention, it is possible to provide a lens barrel in which the degree of freedom of design is improved by increasing the rotation angle of the lens barrel without increasing the size of the camera, and the load on the lens barrel is suppressed.

1 is an external perspective view of an imaging apparatus according to an embodiment of the present invention. 1 is an exploded perspective view of a lens barrel according to an embodiment of the present invention. It is a disassembled perspective view of the movable cam ring and rectilinear cylinder which concern on embodiment of this invention. It is a disassembled perspective view (projection part division | segmentation) of the moving cam ring and rectilinear advance cylinder which concern on embodiment of this invention. It is a schematic diagram of the inner surface development view of the movable cam ring according to the embodiment of the present invention. It is a figure which shows the relative movement of the movable cam ring which concerns on embodiment of this invention, and a rectilinear advance cylinder. It is an inner surface development view of a movable cam ring concerning an embodiment of the present invention. It is a disassembled perspective view of the movable cam ring and rectilinear cylinder which concern on embodiment of this invention. It is a schematic diagram of the inner surface development view of the movable cam ring according to the embodiment of the present invention. It is a schematic diagram of the inner surface development view of the movable cam ring according to the embodiment of the present invention. It is a prior art example.

[Example 1]
Hereinafter, an imaging apparatus according to a first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the movable cam ring rotates at a fixed position with respect to the rectilinear cylinder.

<Appearance of camera body>
FIG. 1 shows a camera to which the present invention is applied. Reference numeral 1 denotes a camera body. The camera body 1 is provided with a lens barrel 2 that can change the focal length of the photographing lens. A lens barrier device 3 that opens and closes the optical path of the photographic lens according to the camera power ON / OFF is provided on the front surface of the lens barrel 2 on the subject side. Further, a light emitting window portion 4 constituting a strobe device that irradiates a subject with illumination light is provided on the upper surface of the camera body 1, and a finder window 5 is provided on the front surface of the camera body 1.

  Further, a release button 6 is provided on the upper surface of the camera body 1 for starting a shooting preparation operation (focus adjustment operation and photometry operation) and a shooting operation (exposure to an image sensor such as a film or a sensor). FIG. 1 is a typical schematic diagram of a camera, and the present invention is not limited to the above configuration.

<About an exploded perspective view of the lens barrel 2>
FIG. 2 shows an exploded perspective view of the lens barrel 2. Reference numeral 7 denotes a first lens holding unit that holds the first group photographing lens and includes the lens barrier device 3 described above. Reference numeral 8 denotes an aperture unit that includes a diaphragm mechanism that adjusts the amount of light. It is a 2nd lens holding unit provided with a vibration lens mechanism and a shutter. Reference numeral 10 denotes a moving cam ring provided inside with a cam groove for defining movement of the first lens holding unit 7, the diaphragm unit 8 and the second lens holding unit 9 in the optical axis direction. The moving cam ring 10 has a gear portion to which power is transmitted from the lens barrel drive motor 13.

  Reference numeral 11 denotes a rectilinear cylinder as a rectilinear member that is rotatably held by the movable cam ring 10 and that regulates the rectilinear movement of the first lens holding unit 7, the aperture unit 8, and the second lens holding unit 9. It is. The rectilinear cylinder 11 has a cylindrical shape, but may have a function of restricting rectilinear advance. For example, the straight cylinder 11 may have a shape in which the arm extends from the donut-shaped member in the optical axis direction to restrict rectilinear advance. Reference numeral 14 denotes a fixed cylinder having a drive cam for driving the movable cam ring 10 on the inner peripheral portion. Reference numeral 12 denotes a third group barrel that holds the third group photographing lens, and reference numeral 15 denotes an image sensor holding member that holds the image sensor.

  The configuration of the lens barrel 2 is not limited to the above configuration as long as it satisfies the characteristics of the present invention.

<About the moving cam ring 10 and the straight cylinder 11>
Next, the moving cam ring 10 and the rectilinear cylinder 11 will be described with reference to FIGS. FIG. 3 is an exploded perspective view of the movable cam ring 10 and the rectilinear cylinder 11. The rectilinear cylinder 11 is provided with projections 11a provided at equal angles at three locations and projecting radially outward. Further, the movable cam ring 10 is provided with a groove portion 10a with which the protruding portion 11a of the rectilinear cylinder 11 is engaged. Since the groove portion 10a is in the movable cam ring 10, even if the movable cam ring 10 rotates, the protruding portion 11a can pass through the groove portion 10a. Further, the movable cam ring 10 is provided with an introduction portion 10b through which the protruding portion 11a passes in the optical axis direction when the rectilinear cylinder 11 is assembled. When the rectilinear cylinder 11 is assembled in the moving cam ring 10 and the moving cam ring 10 is rotated, the protrusion 11a of the rectilinear cylinder 11 is sandwiched between the subject side and the imaging surface side of the groove 10a at the tip of the moving cam ring 10. Engage. By this engagement, the movable cam ring 10 can advance and retreat in the optical axis direction integrally with the rectilinear cylinder 11. Since the groove portion 10a of the moving cam ring 10 is formed around a fixed position in the optical axis direction, the moving cam ring 11 rotates at a fixed position with respect to the rectilinear cylinder 11. Note that the groove 10a is not necessarily formed once, but may be formed at a necessary angle according to the relative rotation amount with respect to the moving cam ring.

  4 is an exploded perspective view of the movable cam ring 10 and the straight cylinder 11 as in FIG. 3. The difference from FIG. 3 is that the protrusion 11a provided on the straight cylinder 11 has a gap in the circumferential direction. It is divided. Further, unlike FIG. 3, the introduction portion 10b has a projection portion 10c at a position where the clearance of the projection portion 11a of the rectilinear cylinder 11 divided in the circumferential direction passes through the movement in the optical axis direction during incorporation. It is equipped. When the rectilinear cylinder 11 is incorporated into the moving cam ring 10 and rotated, the divided projections 11a of the rectilinear cylinder 11 are sandwiched and engaged with the subject side and imaging surface side surfaces of the groove 10a of the moving cam ring 10. By this engagement, the movable cam ring 10 can advance and retreat in the optical axis direction integrally with the rectilinear cylinder 11. Since the groove portion 10a of the moving cam ring 10 is formed around the fixed position in the optical axis direction, the moving cam ring 11 rotates at a fixed position with respect to the rectilinear cylinder 11 as in the case of FIG. Note that the groove 10a is not necessarily formed once, but may be formed at a necessary angle according to the relative rotation amount with respect to the moving cam ring.

  FIG. 5 is a schematic view briefly showing the positional relationship between the groove portion 10a of the moving cam ring 10 and the protruding portion 11a of the rectilinear cylinder 11 by deleting the cam groove from the inner surface development view of the moving cam ring 10.

  (A) is a method in which the protruding portion 11a is not divided, and (b) is a method in which the protruding portion 11a is divided. Further, (c) shows a state when an amount of engagement equivalent to (b) is obtained without dividing the protrusion 11a. With respect to each of (a) to (c), the position of the protrusion 11a of the rectilinear cylinder 11 is the position of SINK, WIDE, and TELE from the right. In addition, although there are originally three protrusions 11a of the rectilinear cylinder 11 in the circumferential direction, for the sake of simplicity, a single part that is incorporated from the central introduction part 10b in the developed schematic diagram will be shown.

  In (a), the position where the protrusion 11a of the straight cylinder 11 incorporated from the introduction part 10b of the moving cam ring 10 is completely introduced is the position indicated by the broken line. When the moving cam ring 10 rotates while being sandwiched in the groove 10 a of the moving cam ring 10 from the position of the broken line, the protrusion 11 a moves relative to the moving cam ring 10 from the SINK to TELE at the rotation angle X1. The amount of protrusion 11a of the straight cylinder 11 in SINK is L1, the length of the protrusion 11a is longer in WIDE, and the amount of protrusion is L2 in TELE. The amount of engagement L1 and L2 in TELE is not large compared to (b) described later, and this bayonet coupling may be removed. This is because depending on the stopping accuracy of the lens barrel, the amount of engagement L1 and L2 between the protrusion 11a and the groove 10a may be further reduced.

  In (b), the protrusion 11a of the straight cylinder 11 is divided in the circumferential direction with a gap. Accordingly, the moving cam ring 10 is also provided with a protruding portion 10c corresponding to a gap generated by dividing the protruding portion 11a in the introducing portion 10b. The protrusion 10c can pass through the gap generated by dividing the protrusion 11a. The amount of engagement between the protrusion 11a of the straight cylinder 11 and the groove 10a in SINK in (b) is L3. In WIDE, the amount of engagement between the protrusion 11a and the groove 10a is the length of the protrusion 11a. In TELE, the amount of engagement between the protrusion 11a and the groove 10a is L4. Since the amounts of engagement are L3> L1 and L4> L2, it is possible to increase the amount of engagement between the protrusion 11a and the groove 10a while moving at the same rotation angle X1.

  In (c), when the applied amount is set to L3 with SINK equivalent to (b) and L4 with TELE, and applied to the bayonet coupling equivalent to (a), the position of SINK and the position of TELE are moved to the MIDDLE side. Therefore, the lens barrel can be rotated only by a rotation angle X2 smaller than the rotation angle X1. In other words, in (b), a sufficient amount of engagement can be obtained while the rotation angle is maximized.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included.

[Example 2]
Hereinafter, an imaging apparatus according to a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the rectilinear cylinder reciprocates relative to the moving cam ring in the optical axis direction. The second embodiment is also applied to the camera shown in FIG.

<About the movement of the moving cam ring 10 and the straight cylinder 11>
The movement of the moving cam ring 10 and the straight cylinder 11 will be described with reference to FIGS. FIG. 6 is a front view and a side view of the moving cam ring 10 and the straight cylinder 11 as seen from the subject side. FIG. 7 is an inner surface development view of the movable cam ring 10.

  6A, the lens barrel of the camera body 1 is in the retracted state, and the movable cam ring 10 and the rectilinear barrel 11 are close to each other in the optical axis direction. That is, there are many areas where the movable cam ring 10 and the rectilinear cylinder 11 overlap in the optical axis direction. When the power is turned off or the camera body 1 shifts from the shooting state to the playback state, the camera body 1 enters a non-shooting state and the lens barrel shifts to the retracted state.

  When the power of the camera body 1 is turned on, the moving cam ring 10 rotates in the direction of the arrow in FIG. Due to the rotation of the moving cam ring 10, the protrusion 11 a of the rectilinear cylinder 11 moves relative to the moving cam ring 10. FIG. 7 shows this state. FIG. 7B shows a state in which the protrusion 11a of the rectilinear cylinder 11 slides down from the subject side to the image pickup side from the SINK state (part (a)) along the bayonet groove 10a of the movable cam ring 10. The state (b) is reached. The SINK state (portion (a)) is formed in a first length around the optical axis as a first region engaged with the protrusion (11a). The portion (b) is formed as a second region engaged with the protrusion (11a) to a second length around the optical axis. Here, the first length is shorter than the second length as the engagement region with the protrusion (11a). In this state (b), as shown in FIG. 6, the rectilinear cylinder 11 is moved relative to the moving cam ring 10 by L in the optical axis direction from the subject side to the imaging side. That is, in the state (b), the rectilinear cylinder 11 is moved to the imaging surface side with respect to the movable cam ring 10 as compared with the state (a). In the above description, it has been described that the first length is shorter than the second length as the engagement region with the protrusion (11a). In this regard, depending on the relative movement in the optical axis direction between the rectilinear cylinder 11 and the movable cam ring 10 (relative to the rotation angle of the movable cam ring 10), the first length is set as the engagement region with the protrusion (11a). May be longer than the second length.

  Thereafter, when the rotation of the movable cam ring 10 further continues, the protrusion 11a of the rectilinear cylinder 11 further moves relatively. Specifically, the protrusion 11a rides on the slope from the imaging side to the subject side along the bayonet groove 10a of the movable cam ring 10 and reaches the state (c) from the state (b). This part (c) is formed in a third length around the optical axis as a third region that engages with the protrusion (11a). In the state of (c), the movable cam ring 10 and the rectilinear cylinder 11 are close to each other in the optical axis direction as in the state of (a). Therefore, the state of (c) is a state where the area where the movable cam ring 10 and the rectilinear cylinder 11 overlap in the optical axis direction is larger than the state of (b), similarly to the state of (a). In this way, the moving cam ring 10 and the rectilinear cylinder 11 move integrally by bayonet coupling, and the moving cam ring 10 and the rectilinear cylinder 11 move relative to each other in the middle. The operation in the retraction direction is exactly the reverse of the flow described above.

<About an exploded perspective view of the moving cam ring 10 and the straight cylinder 11>
FIG. 8 is an exploded perspective view of the movable cam ring 10 and the rectilinear cylinder 11. The rectilinear cylinder 11 is provided with three protrusions 11a projecting radially outward in the circumferential direction. The protruding portion 11a of the rectilinear cylinder 11 is provided with inclined portions 11c at four corners. The groove portion 10a of the moving cam ring 10 is provided with an inclined portion 10d that comes into contact with the inclined portion 11c of the straight cylinder 11 when rotated. By providing the inclined portion 10d, the rectilinear cylinder 11 can be moved relative to the moving cam ring 10 in the optical axis direction.

  Further, the rectilinear groove 11b formed in the rectilinear cylinder 11 regulates rectilinear advance that restricts the rotation of the second lens holding unit 9 around the optical axis. Here, as shown in FIG. 8, the rectilinear groove 11b shares the gap between the divided projections 11a in the same phase. Further, the projecting portion 11a is shorter than the first length described above in the gap. Thus, if the protrusion 11a of the rectilinear cylinder 11 is divided, the rectilinear groove 11b can be arranged in a phase that divides the protrusion 11a of the rectilinear cylinder 11. Therefore, the degree of freedom in design including the layout of the cam can be greatly improved, and this configuration is the same as that of the first embodiment.

  In this embodiment, the number of divisions of the projection 11a is two. However, the number of divisions with the groove 10a and a decrease in the durability of each projection by increasing the number of divisions are plural. It may be.

<About the positional relationship between the groove 10a and the protrusion 11a>
9 and 10 are schematic views simply showing the positional relationship between the groove portion 10a of the moving cam ring 10 and the protruding portion 11a of the rectilinear cylinder 11 by removing the cam groove from the inner surface development view of the moving cam ring 10. FIG. In FIG. 9 and FIG. 10, the phase of the built-in introducing portion 10b is different.

  FIGS. 9 and 10A show a method in which the protruding portion 11a is not divided, and FIGS. 9B and 10B show a method in which the protruding portion 11a is divided. With respect to (a) and (b), the positions of the protrusions 11a of the rectilinear cylinder 11 are the positions of SINK, WIDE, and TELE from the right. In addition, although the protrusion 11a of the rectilinear cylinder 11 is originally present at three locations in the circumferential direction, one location that is incorporated from the central introduction portion 10b of the developed schematic diagram is shown for simplicity. The rectilinear cylinder 11 reciprocates relative to the moving cam ring 10 in the optical axis direction. Therefore, the position of WIDE moves from the subject side to the imaging surface side in the optical axis direction with respect to the positions of SINK and TELE. This spans the second length as described above. In (a), the position where the protrusion 11a of the straight cylinder 11 incorporated from the introduction part 10b of the moving cam ring 10 is completely introduced is the position indicated by the broken line. When the moving cam ring 10 rotates while being sandwiched in the groove 10a of the moving cam ring 10 from the position of the broken line, the protrusion 11a relatively reciprocates in the optical axis direction from SINK to TELE relative to the moving cam ring 10. To do. At the same time, the rotation angle X3 is moved while relatively rotating around the optical axis. The relative positions of the movable cam ring 10 and the rectilinear cylinder 11 in the same optical axis direction as the WIDE extend over the second length as described above.

  The amount of engagement between the protrusion 11a of the straight cylinder 11 and the groove 10a in SINK is L5. In WIDE, the amount of engagement between the protrusion 11a and the groove 10a is the length of the protrusion 11a. In TELE, the amount of engagement between the protrusion 11a and the groove 10a is L6. In both SINK and TELE, the amount of engagement between the protrusion 11a and the groove 10a is not large compared to (b) described later. Therefore, the case where the bayonet coupling | bonding by the projection part 11a and the groove part 10a remove | deviates is also considered. This is because depending on the stopping accuracy of the lens barrel, the amount of engagement L1 and L2 between the protrusion 11a and the groove 10a may be further reduced.

  In FIG. 9 and FIG. 10B, the protrusion 11a of the rectilinear cylinder 11 is divided in the circumferential direction with a gap in the first length as described above. Accordingly, the moving cam ring 10 is also provided with a protruding portion 10c corresponding to a gap generated by dividing the protruding portion 11a in the introducing portion 10b. The protrusion 10c can pass through the gap generated by dividing the protrusion 11a. Here, the introduction portion 10b needs to be provided at a position where the inclined portion 10d is not cut so that the rectilinear cylinder 11 and the movable cam ring 10 can be reciprocated in the optical axis direction.

  The amount of engagement between the protrusion 11a of the straight cylinder 11 and the groove 10a in SINK is L7. Further, the amount of engagement by the engagement between the protrusion 11a and the groove 10a in WIDE is the length of the protrusion 11a. The amount of engagement due to the engagement between the protrusion 11a and the groove 10a in TELE is L8. Since the amount of engagement due to the engagement between the protrusion 11a and the groove 10a satisfies L7> L5 and L8> L6, the amount of engagement can be increased while moving at the same rotation angle X3.

  In Example 1, the rotation angle in FIG. 5A for making the amount of engagement equivalent to that in FIG. 5B was estimated and compared as FIG. 5C. In the second embodiment, since the rectilinear movement of the rectilinear cylinder 11 and the moving cam ring 10 in the optical axis direction is necessary, it is necessary to leave the inclined portion 10d as described above, which corresponds to (c) of FIG. It is difficult to create a drawing.

  9A and 9B are compared, it is possible to move the rotation angle X3 while maintaining a large amount of engagement due to the engagement between the protrusion 11a and the groove 10a as in the first embodiment. The rotation angle between SINK and TELE can be expanded to the maximum within the rotation angle up to another introduction portion 10b corresponding to another protrusion 11a. As a result, the lift of the cam (the amount of movement in the optical axis direction with respect to the rotation angle of the moving cam ring 10) can be reduced, leading to the suppression of the driving force for rotating the moving cam ring 10.

  In the built-in phase of FIG. 10, in (a), since the introduction part 10b of the moving cam ring 10 requires a width in the circumferential direction, an inclined part for relative movement from WIDE to the position in the optical axis direction of TELE. There is a high possibility that 10d cannot be formed. If it does so, the relative reciprocating motion to the optical axis direction of the movable cam ring 10 and the rectilinear cylinder 11 will not be materialized. Also in such technical significance, it is meaningful to divide the protruding portion 11a of the rectilinear cylinder 11 with a gap as shown in FIG. The projecting portion 10c is provided on the introduction portion 10b of the moving cam ring 10, and the inclined portion 10d is formed on the projecting portion 10c, so that the reciprocating motion in the optical axis direction between the moving cam ring 10 and the rectilinear cylinder 11 is established. Because it becomes possible.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included.

DESCRIPTION OF SYMBOLS 10 Drive cam ring 10a Groove part 10b Introduction part 10c Protrusion part 10d Inclination part 11 Straight advance cylinder 11a Protrusion part 11b Straight advance groove 11c Inclination part

Claims (3)

A lens holding unit that holds the lens and moves in the optical axis direction;
A movable cam ring in which a cam groove for defining movement of the lens holding unit) in the optical axis direction is formed;
A rectilinear groove that regulates the rotational direction of the lens holding unit; and a rectilinear member that is disposed on the inner side of the movable cam ring, and has a protrusion that engages with a groove formed in the movable cam ring. ,
The groove portion is formed in a first region and a second length that are formed in a first length as an engagement region with the protrusion at different positions in the optical axis direction and around the optical axis. A second region, the first region and the second region are connected by an inclined portion,
The protrusion that engages with the groove is divided into a plurality of areas in a narrower range than the shorter one of the first length and the second length,
The movable cam ring is provided with a projection that passes through the gap between the plurality of projections divided into the plurality of projections that are introduced into the plurality of projections in the optical axis direction. A lens barrel characterized by that.   2. The lens according to claim 1, wherein the rectilinear member moves in the optical axis direction integrally with the movement of the movable cam ring in the optical axis direction by the engagement between the protrusion and the groove. A lens barrel.   The lens barrel according to claim 1, wherein the protrusion is provided with an inclined portion that comes into contact with the inclined portion.

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