JP2013029600A - Barrier unit, lens barrel with the same, and imaging device - Google Patents

Abstract

There is provided a mechanism for preventing a barrier blade from coming off in an optical axis direction even when a barrier unit without a barrier cover is subjected to an impact such as vibration or dropping during transportation.
A barrier unit includes a barrier blade, a barrier holding member that supports the barrier blade so that the barrier blade can be opened and closed, and a barrier blade that is rotatably held around the optical axis with respect to the barrier holding member. A barrier driving member 21 to which a rotational force for opening and closing 20 is transmitted, a barrier urging member provided between the barrier driving member 21 and the barrier blade 20 and urging the barrier blade 20 in the opening direction; Engagement portions 20c, 22h that are provided between the blade 20 and the barrier holding member 22 and engage with each other to restrict movement of the barrier blade 20 in the optical axis direction when the barrier blade 20 is in an open state.
[Selection] Figure 8

Description

  The present invention relates to a barrier unit, a lens barrel including the barrier unit, and an imaging apparatus such as a digital camera including the lens barrel.

  In a lens barrel on which a barrier unit is mounted, a technique for improving assembly workability by directly fixing the barrier unit to a barrier unit holding member by bayonet coupling has been proposed (Patent Document 1).

  In this proposal, the barrier unit is assembled between the base and the barrier cover with a drive ring, a barrier blade, and a spring that biases the barrier blade in the closing direction. The drive ring includes an engagement portion that engages with a part of the barrier blade, and a rotation transmission portion that extends to the image plane side in parallel with the optical axis and transmits a rotational force.

  Then, when the rotational force is transmitted to the rotation transmitting portion, the drive ring rotates with respect to the base, the engaging portion of the rotating drive ring engages with a part of the barrier blade, and the barrier blade is opened and closed. Let

  Further, since the barrier cover is connected to the base so that the barrier blade is sandwiched between the barrier cover and the barrier unit, the barrier blade is detached in the optical axis direction even when the barrier unit receives an impact such as vibration during transportation or dropping. Can be prevented.

JP 2005-106969 A

  In the above-mentioned Patent Document 1, when the barrier unit is configured by assembling a drive ring, a spring, and a barrier blade between the base and the barrier cover, the barrier unit receives an impact such as vibration during transportation or dropping. However, the barrier blade is prevented from coming off in the optical axis direction.

  However, in recent years, a barrier unit in which the barrier cover is omitted has been proposed for the purpose of reducing the number of parts and reducing the thickness. Therefore, it is desirable to prevent the barrier blades from coming off in the optical axis direction when the barrier unit without the barrier cover is also subjected to an impact such as vibration during transportation or dropping.

  Therefore, the present invention provides a mechanism that can prevent the barrier blades from coming off in the optical axis direction even when the barrier unit is omitted from the barrier cover when subjected to an impact such as vibration during transportation or dropping. The purpose is to do.

  To achieve the above object, the barrier unit of the present invention comprises a barrier blade, a barrier holding member that supports the barrier blade in an openable / closable manner, and the optical axis of the optical system with respect to the barrier holding member. A barrier driving member that is held in such a manner that a rotational force for opening and closing the barrier blade with respect to the opening of the photographing optical system is transmitted, and is provided between the barrier driving member and the barrier blade. Provided on the barrier urging member that urges the blade in the opening direction, the barrier blade and the barrier holding member, and engages with each other when the barrier blade is open to restrict movement of the barrier blade in the optical axis direction And an engaging portion.

  According to the present invention, even in a barrier unit in which the barrier cover is omitted, it is possible to prevent the barrier blades from coming off in the optical axis direction when receiving an impact such as vibration during transportation or dropping.

It is the external appearance perspective view which looked at the digital camera as an example of an imaging device provided with the lens barrel which concerns on embodiment of this invention from the front side. It is a disassembled perspective view of a lens barrel. It is a disassembled perspective view of a first group barrel. It is a perspective view of a barrier unit holding member including an exploded perspective view of a barrier unit. It is the perspective view which expanded a part of barrier unit. It is a perspective view which shows the state before incorporating a barrier unit in the edge part by the side of the subject of a barrier unit holding member. It is the figure which looked at the fully open state of the barrier blade | wing in the optical axis direction from the to-be-photographed object side. It is a perspective view which shows the relationship between the barrier unit at the time of extending | stretching of a lens barrel, and a rectilinear guide cylinder. It is a perspective view which shows the relationship between the barrier unit and the rectilinear guide cylinder when the lens barrel is retracted. It is the figure which looked at the fully closed state of the barrier blade | wing in the optical axis direction from the to-be-photographed object side.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an external perspective view of a digital camera as an example of an image pickup apparatus including a lens barrel according to an embodiment of the present invention, as viewed from the front side. The state of the digital camera shown in FIG. 1 is a state in which the lens barrel 2 is at the photographing position with the power of the digital camera of this embodiment turned on.

  As shown in FIG. 1, the digital camera of this embodiment is provided with a zoom lens barrel 2 and a finder window 5 on the front side of the camera body 1. The lens barrel 2 is retracted to the retracted position when the power source of the camera body 1 is off, and is extended to the photographing position when the power source of the camera body 1 is on.

  Further, on the upper surface of the camera body 1, there are provided a light emission window portion 4 and a release button 6 of a strobe device that irradiates a subject with illumination light. Although not shown, an imaging element such as a CCD sensor or a CMOS sensor that photoelectrically converts a subject image formed through the photographing optical system of the lens barrel 2 is mounted inside the camera body 1. ing.

<Configuration of lens barrel 2>
FIG. 2 is an exploded perspective view of the lens barrel 2. As shown in FIG. 2, the lens barrel 2 includes a first group lens barrel 7, a rectilinear guide barrel 8, a second group lens barrel 9, a moving cam barrel 10, a third group lens barrel 11, a fixed barrel 12, and a mirror. A tube holding member 13 is provided.

  The first group lens barrel 7 is disposed on the outer peripheral side of the rectilinear guide tube 8 and holds the first lens group 16 (see FIG. 3). The rectilinear guide tube 8 is disposed on the inner peripheral side of the fixed tube 12 fixed to the lens barrel holding member 13, and the rotation is restricted by the fixed tube 12 so that it can move only in the optical axis direction.

  The second group lens barrel 9 is disposed on the inner peripheral side of the rectilinear guide tube 8 and holds the second lens group 9a. The rotation of the second group lens barrel 9 is restricted by the rectilinear guide barrel 8, and is movable only in the optical axis direction. The second group lens barrel 9 has a shutter unit, a diaphragm unit, and a shake correction mechanism (not shown).

  The moving cam cylinder 10 is disposed on the outer peripheral side of the rectilinear guide cylinder 8 and on the inner peripheral side of the fixed cylinder 12, and is rotatable around the optical axis with respect to the rectilinear guide cylinder 8 and is movable in the optical axis direction. Has been.

  The third group lens barrel 11 holds the third lens group 11a. The third lens group 11a functions as a focus lens group that moves in the optical axis direction during a focusing operation. The third group lens barrel 11 is guided in the optical axis direction by an AF guide shaft fixed to the barrel holding member 13, and is moved in the optical axis direction by rotation of a screw.

  When a rotational driving force is transmitted from the zoom motor (not shown) to the moving cam cylinder 10, the moving cam cylinder 10 moves along the optical axis direction while rotating, and the linear guide cylinder 8 does not rotate. 10 and move in the optical axis direction. Further, the first group lens barrel 7 and the second group lens barrel 9 move along the optical axis direction in a state where the rotation is restricted by the rectilinear guide barrel 8. In the present embodiment, two groups of focal lengths can be changed by moving the first lens group 17 of the first group lens barrel 7 and the second lens group 9a of the second group lens barrel 9 in the optical axis direction. A zoom lens barrel is formed.

<Structure of barrier unit 3>
FIG. 3 is an exploded perspective view of the first group lens barrel 7. As shown in FIG. 3, the first lens barrel 7 includes a cap 14, a barrier unit 3, and a barrier unit holding member 15. Three follower pins 18 project from the outer peripheral portion of the barrier unit holding member 15 at substantially equal intervals in the circumferential direction. The first lens group 16 is held via a first group lens holding frame 17 at the center of the barrier unit holding member 15.

  The barrier unit 3 is fixed to the subject-side end of the barrier unit holding member 15 by bayonet coupling so as to cover the first lens group 16. The cap 14 is fixed to the barrier unit 3 and the barrier unit holding member 15 via a double-sided tape or the like.

  In this embodiment, the fixing position here is the outer peripheral portion of the bayonet restricting portion 22c of the barrier holding member 22 for the barrier unit 3, and the outer peripheral portion of the bayonet restricting portion 15a for the barrier unit holding member 15.

  FIG. 4 is a perspective view of the barrier unit 3 and the barrier unit holding member 15, and the barrier unit 3 is shown in an exploded perspective view. As shown in FIG. 4, the barrier unit 3 includes a barrier urging member 19, a barrier blade 20, a barrier driving member 21, and a barrier holding member 22.

  The barrier unit 3 is disposed in front of the imaging optical system of the lens barrel 2 and covers the opening of the imaging optical system so that it can be opened and closed in accordance with the power on / off of the camera body 1. When the power source of the camera body 1 is turned off, the lens barrel 2 is retracted to the retracted position, and the barrier blades 20 (see FIG. 4) of the barrier unit 15 are closed. On the contrary, when the power source of the camera body 1 is turned on, the lens barrel 2 is extended to the photographing position and the barrier blades 20 of the barrier unit 3 are opened.

  The barrier urging member 19 is constituted by, for example, a tension coil spring, and is hooked between the barrier blade 20 and the barrier driving member 21 to generate an urging force in a direction in which the barrier blade 20 is opened. The barrier blade 20 has a shaft 20b rotatably supported by the barrier holding member 22, and is rotatable in a direction to open and close the opening of the barrier holding member 22 with the shaft 20b as a fulcrum.

  The barrier driving member 21 is held rotatably with respect to the barrier holding member 22 around the optical axis. As will be described later, the barrier holding member 22 is fitted to the barrier unit holding member 15 in the optical axis direction and fixed by bayonet coupling.

  In order to assemble the barrier unit 3, first, after the barrier driving member 21 is assembled in the optical axis direction from the subject side with respect to the barrier holding member 22, the shaft 20 b of the barrier blade 20 is inserted into the shaft hole 22 b of the barrier holding member 22. Incorporate from the side.

  On the outer peripheral portion of the barrier driving member 21, two flange portions 21b projecting radially outward are provided at intervals in the circumferential direction. In addition, a rotation transmission portion 21c that protrudes in parallel with the optical axis toward the image plane side is provided on the outer peripheral portion of the barrier drive member 21, and an inclined cam surface 21d is provided at the tip of the rotation transmission portion 21c. Is formed. A through hole 15b into which the rotation transmitting portion 21c of the barrier driving member 21 is inserted in the optical axis direction is formed at the subject-side end of the barrier unit holding member 15.

  The subject-side surface of the two flange portions 21b and the subject-side surface of the rotation transmitting portion 21c are sliding surfaces, and the three sliding surfaces each have three bayonets on the barrier holding member 22 due to the bayonet structure. It enters and contacts the image side surface of the restricting portion 22c.

  As a result, movement of the barrier drive member 21 in the optical axis direction (for example, deformation such as displacement and bending) is restricted, and a smooth opening / closing operation of the barrier blade 20 is ensured. Further, since the positional relationship in the optical axis direction between the barrier driving member 21 and the barrier holding member 22 is always maintained from the open state to the closed state of the barrier blade 20, the barrier driving member 21 is opened and closed during the opening and closing operation of the barrier blade 20. Does not fall off from the barrier holding member 22.

  On the other hand, in the direction orthogonal to the optical axis, the fitting portions provided on the outer peripheral portion of the barrier driving member 21 are connected to the six fitted portions 22 d provided in the circumferential direction on the inner peripheral portion of the barrier holding member 22. 21e is slidably fitted in the circumferential direction. As a result, the barrier driving member 21 is accurately held while being rotatable with respect to the barrier holding member 22.

  In this state, when both ends of the barrier urging member 19 are hooked on the spring hooking portion 20a of the barrier blade 20 and the spring hooking portion 21a of the barrier driving member 21, respectively, the barrier blade 20 and the barrier driving member 21 are provided with a barrier. They are attracted to each other by the urging force of the urging member 19.

  Thereby, the barrier drive member 21 rotates clockwise in the figure, and the barrier blade 20 rotates counterclockwise as the barrier drive member 21 rotates, and is biased in the opening direction. The barrier blade 20 is held in the open position by abutting against the opening stopper portion 22 e provided on the barrier holding member 22.

  When the barrier blades 20 are in the open state, the above-described three sliding surfaces of the barrier driving member 21 overlap the three bayonet regulating portions 22c of the barrier holding member 22, so that the barrier driving member 21 is It does not deviate in the optical axis direction.

  FIG. 5 is an enlarged perspective view of a part of the barrier unit 3.

  As shown in FIGS. 4 and 5, the barrier blade 20 is provided with an engaging protrusion 20 c as a protrusion protruding in the opening direction from the surface facing the image surface side of the barrier blade 20. The engaging protrusion 20c is guided to a guide groove 21g (FIG. 10) described later formed in the barrier driving member 21 when the barrier blade 20 is opened and closed.

  Then, the engagement protrusion 20c is inserted into an engagement hole 22h as a fitting portion formed through the outer peripheral portion of the barrier holding member 22 in the radial direction in the opened state of the barrier blade 20. In the state of the barrier unit 3, the barrier blade 20 is constantly urged in the opening direction by the barrier urging member 19, so that the insertion state of the engagement protrusion 20 c into the engagement hole 22 h is maintained. The movement of the blade 20 in the optical axis direction is restricted. As described above, the engaging protrusion 20c of the barrier blade 20 and the engaging hole 22h of the barrier holding member 22 form the engaging portion of the present invention, and the movement in the optical axis direction is performed when the barrier blade 20 is in the open state. Be regulated.

  If the movement of the barrier blade 20 in the optical axis direction is restricted by engaging with a part of the barrier holding member 22 (in this embodiment, the engagement hole 22h), the shape of the engagement protrusion 20c becomes a protrusion shape. Not limited. Similarly, the engagement hole 22h does not necessarily have to be a through hole, and may be, for example, a groove shape or a counterbore hole.

<Method for Fixing Barrier Unit 3 and Barrier Unit Holding Member 15>
Next, a method for fixing the barrier unit 3 to the end of the barrier unit holding member 15 on the subject side by bayonet coupling will be described with reference to FIGS. 6 and 7.

  FIG. 6 is a perspective view showing a state before the barrier unit 3 is assembled to the end of the barrier unit holding member 15 on the subject side, and FIG. 7 shows the state in which the barrier blades 20 of the barrier unit 3 are opened from the subject side in the optical axis direction. FIG.

  First, from the state of FIG. 6, the barrier unit 3 is moved closer to the barrier unit holding member 15 in the optical axis direction, and the rotation transmitting portion 21 c of the barrier driving member 21 is inserted into the through hole 15 b of the barrier unit holding member 15. At this time, the fitting cylinder portion 22g of the barrier holding member 22 is fitted into the inner peripheral portion of the barrier unit holding member 15.

  Then, when the barrier unit 3 is rotated counterclockwise with respect to the barrier unit holding member 15, the two rotation restricting portions 22 f of the barrier holding member 22 are arranged at two positions of the barrier unit holding member 15 as shown in FIG. 7. The rotation restricting projection 15c is overtaken and fitted.

  Thereby, the barrier holding member 22 is positioned with its rotation restricted with respect to the barrier unit holding member 15 in the circumferential direction of the plane orthogonal to the optical axis. Further, the three protrusions 22a (FIG. 6) provided on the outer peripheral portion of the barrier holding member 22 are inserted into the three bayonet restricting portions 15a provided at the corresponding positions of the barrier unit holding member 15, and the optical axis. Regulated in direction. As a result, movement of the barrier holding member 22 in the optical axis direction (for example, deformation such as displacement and bending) is restricted.

  And the fitting cylinder part 22g of the barrier holding member 22 fits into the six to-be-fitted parts 15d (FIG. 4) provided in the inner peripheral part of the barrier unit holding member 15, and is orthogonal to the optical axis. Positioning is also performed in the radial direction. Thus, even when the barrier unit 3 is fixed to the barrier unit holding member 15 by bayonet coupling, the barrier unit 3 can be positioned and fixed with respect to the barrier unit holding member 15 with high accuracy.

  Next, the opening / closing operation of the barrier blade 20 will be described with reference to FIGS.

  FIG. 8 is a perspective view showing the relationship between the barrier unit 3 and the rectilinear guide tube 8 when the lens barrel 2 is extended, and FIG. 9 shows the relationship between the barrier unit 3 and the rectilinear guide tube 8 when the lens barrel 2 is retracted. It is a perspective view shown. FIG. 10 is a view of the closed state of the barrier blade 20 as viewed from the subject side in the optical axis direction. In FIG. 8 and FIG. 9, illustrations other than the barrier unit 3 and the rectilinear guide tube 8 are omitted for convenience of explanation.

  When the lens barrel 2 is gradually retracted from the extended state of FIG. 8, the cam surface 21 d of the rotation transmitting portion 21 c of the barrier drive member 21 contacts the cam engaging portion 8 a of the rectilinear guide tube 8. At this time, the cam surface 21d of the rotation transmitting portion 21c receives a force in the normal direction from the cam engaging portion 8a due to the cam action, and the component forces are F1 and F2.

  The component force F1 is a force that attempts to rotate the barrier driving member 21 counterclockwise against the urging force of the barrier urging member 19, and the component force F2 is a force that pushes the barrier driving member 21 in the feeding direction. It is.

  In the state of FIG. 8, the component force F1 pushes the rotation transmitting portion 21c of the barrier drive member 21 and rotates it counterclockwise. As a result, the blade pressing portion 21f moves away from the barrier blade 20, and the barrier blade 20 also rotates in the closing direction about the shaft 20b so as to follow the blade pressing portion 21f. When the retraction operation of the lens barrel 2 further proceeds, the barrier driving member 21 rotates by the rotation angle necessary to fully close the barrier blade 20 (FIG. 10), and the retracted state shown in FIG. 9 is obtained.

  In the present embodiment, the barrier driving member 21 is moved in the closing direction of the barrier blade 20 by the rotation direction for fixing the barrier unit 3 to the barrier unit holding member 15 by bayonet coupling and the component force F1 received by the rotation transmitting portion 21c. The direction of rotation is matched. Therefore, the barrier driving member 21 is prevented from being detached from the barrier holding member 22 by the opening / closing operation of the barrier blade 20.

  Further, as described above, since the rotation restricting portion 22f is fitted to the rotation restricting protrusion 15c of the barrier unit holding member 15, the barrier holding member 15 is not affected by the rotational force generated by the component force F1. There will be no departure.

  When the rotation transmitting portion 21c receives the component force F2, as described above, the subject-side surface of the two flange portions 21b of the barrier driving member 21 and the subject-side surface of the rotation transmitting portion 21c are the barrier holding member. The three bayonet restricting portions 22c of 22 are received in the optical axis direction. As a result, movement of the barrier driving member 21 in the optical axis direction (for example, deformation such as displacement and bending) is restricted, and the opening / closing operation of the barrier blade 20 can be performed smoothly.

  Further, as described above, since the barrier holding member 22 is also restricted from moving in the optical axis direction with respect to the barrier unit holding member 15, the transmission loss of the external force received by the rotation transmission portion 21c of the barrier driving member 21 is reduced. can do. Thereby, the opening / closing operation | movement of the barrier blade | wing 20 can be performed efficiently.

  Further, the barrier holding member 22 is provided with two restricting portions (not shown) in the vicinity of the rotation transmitting portion 21c, and the barrier unit holding member 15 receives them. As described above, the barrier driving member 21 and the barrier holding member 22 are structured not to be detached in the optical axis direction even when the component force F2 is applied to the rotation transmitting portion 21c.

  Next, the operation of the barrier blade 20 from the closed state to the opening direction will be described.

  When the lens barrel 2 is gradually retracted from the retracted state of FIG. 9, the barrier drive member 21 causes the cam surface 21d of the rotation transmitting portion 21c to engage with the cam of the rectilinear guide tube 8 as the barrier unit holding member 15 is retracted. It rotates while engaging the joint 8a.

  When the lens barrel 2 is further extended, the engagement between the cam engaging portion 8a and the rotation transmitting portion 21c of the rectilinear guide tube 8 that has applied force to the rotation transmitting portion 21c of the barrier driving member 21 from the state of FIG. 9 is released. Is done.

  As a result, only the urging force of the barrier urging member 19 is applied to the barrier driving member 21, so that the barrier driving member 21 rotates in the clockwise direction. By this rotation, the barrier blade 20 is pushed by the blade pressing portion 21f of the barrier driving member 21, and rotates counterclockwise about the shaft 20b, and is in a fully opened state shown in FIG.

  As shown in FIG. 10, the engagement protrusion 20 c provided on the barrier blade 20 is guided along the opening and closing direction of the barrier blade 20 on the surface of the barrier driving member 21 facing the subject side when the barrier blade 20 is opened and closed. Two guide grooves 21g are formed at a distance of approximately 180 ° in the circumferential direction.

  Further, when the engagement protrusion 20c is guided along the guide groove 21g during the opening / closing operation of the barrier blade 20, the engagement protrusion 20c causes the foreign matter such as sand and dust that has entered the guide groove 21g to be outside the guide groove 21g. Sweep out to discharge.

  The barrier holding member 22 that rotatably holds the barrier driving member 21 is provided with a discharge portion 22 i that discharges foreign matters such as sand and dust swept out by the engaging protrusions 20 c of the barrier blade 20. Thereby, the malfunctioning of the barrier blade | wing 20 by the catch of sand, dust, etc. can be prevented.

  As described above, in this embodiment, in the opened state of the barrier blade 20, the engagement protrusion 20 c provided on the barrier blade 20 is inserted into the engagement hole 22 h of the barrier holding member 22, and the optical axis of the barrier blade 20. Directional movement is restricted.

  Thereby, even if it is the barrier unit 3 which abbreviate | omitted the barrier cover like this embodiment, the barrier blade | wing 20 will float or remove | deviate to an optical axis direction, when receiving impacts, such as a vibration at the time of conveyance, and a fall Can be prevented.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

  For example, in the above-described embodiment, the straight guide tube 8 is illustrated as the rotational force transmitting member that rotates the barrier driving member 21 during the opening / closing operation of the barrier blades 20, but is not limited thereto. For example, when the barrier drive member 21 receives a rotational force from a member other than the linear guide tube 8, the rotational force of the rotary member may be transmitted to the barrier drive member 21.

  In the above embodiment, the barrier blade 20 is supported by the barrier holding member 22 so as to be opened and closed, and the barrier driving member 21 is rotatably held on the inner peripheral portion of the barrier holding member 22. It is not limited to this.

  For example, the barrier holding member 22 is omitted and the barrier blade 20 is supported by the barrier unit holding member 15 so that the barrier blade 20 can be opened and closed, and the barrier driving member 21 is rotatably held on the inner peripheral portion of the end of the barrier unit holding member 15 on the subject side. You may make it do.

  In this case, instead of the engagement hole 22h of the barrier holding member 22, an engagement hole (not shown) penetrating in the radial direction is formed in the outer peripheral portion of the barrier unit holding member 15, and an open barrier is formed in the engagement hole. The engagement protrusion 20c of the blade 20 is inserted to restrict the movement of the barrier blade 20 in the optical axis direction.

3 Barrier unit 15 Barrier unit holding member 19 Barrier urging member 20 Barrier blade 20c Engaging projection 21 Barrier driving member 21b Guide groove 22 Barrier holding member 22h Engaging hole 22i Discharge portion

Claims (7)

Barrier blades,
A barrier holding member that supports the barrier blade so as to be openable and closable;
A barrier driving member that is rotatably held around the optical axis of the optical system with respect to the barrier holding member, and that transmits a rotational force for opening and closing the barrier blade with respect to the opening of the photographing optical system;
A barrier urging member that is provided between the barrier driving member and the barrier wing and urges the barrier wing in an opening direction;
A barrier provided on the barrier blade and the barrier holding member and engaging with each other when the barrier blade is open to restrict movement of the barrier blade in the optical axis direction. unit.   The engaging portion includes a protruding portion protruding in an opening direction of the barrier blade from a surface facing the image plane side of the barrier blade, and a fitting portion into which the protruding portion is inserted in the opened state of the barrier blade, The barrier unit according to claim 1, comprising:   The barrier according to claim 2, wherein the barrier driving member is formed with a guide groove that guides the protrusion along the opening / closing direction of the barrier blade when the barrier blade is opened / closed. unit. The barrier unit according to any one of claims 1 to 3,
Holding a lens that forms part of the imaging optical system, and a barrier unit holding member to which the barrier unit is fitted in the optical axis direction,
The barrier unit holding member is fixed by bayonet coupling with the barrier unit by holding the barrier unit and then rotating the barrier unit in a direction coinciding with the direction in which the barrier driving member is rotated. Characteristic lens barrel. The barrier driving member further has a rotation transmitting portion that protrudes toward the image plane side and that transmits a rotational force for opening and closing the barrier blades from the rotational force transmitting member,
5. The lens according to claim 4, wherein the barrier driving member transmits a rotational force by a cam action between a cam surface of the rotation transmitting portion and a cam engaging portion formed on the rotational force transmitting member. A lens barrel.   The lens barrel according to claim 5, wherein the rotational force transmitting member is a rectilinear guide tube.   An imaging device comprising the lens barrel according to any one of claims 4 to 6.

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