JP5274058B2 - Lens barrel and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel and an imaging apparatus which can be prevented from being damaged or broken due to the impact of falling-down or the like. <P>SOLUTION: A lens unit 3 has a follower 3b on its periphery, incorporates an optical lens, and is movable in the direction of its optical axis. A cylindrical member 4 has in its internal circumferential part a cam groove 4b along which the follower 3b follows. In addition, a lens unit 3 is engaged with the cylindrical member 4 via the follower 3b. A linear advancement restricting member 7 is disposed on the internal circumferential side of the cylindrical member 4, and restricts the rotation of the lens unit 3 when it moves in the direction of the optical axis. A second cylindrical member 6 is disposed on the peripheral side of the cylindrical member 4, and moves the cylindrical member 4 as it rotates. A fixing member 8 is connected to the second cylindrical member 6 and is movable in the direction of the optical axis, and holds the lens unit 3 by means of a lens holding part 8a within the range where the follower 3b of the lens unit 3 is prevented from separating from the cam groove 4b of the cylindrical member 4. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a lens barrel and an imaging apparatus that can be applied to a film camera, a digital camera, and the like.

  Conventionally, film cameras that take a picture using a silver salt film are widely used. However, in recent years, digital cameras that can record an image taken without using a film in a memory are rapidly spreading. Some digital cameras are equipped with a photographic lens barrel having a zoom mechanism that moves a plurality of optical lenses in the optical axis direction to change the photographic magnification.

  Various techniques have been proposed for a lens barrel (zoom lens barrel) provided with the zoom mechanism (see, for example, Patent Document 1). In the lens barrel of Patent Document 1, a plurality of lens holding portions that respectively hold a plurality of optical lenses are moved in the optical axis direction via the cam ring, and movement of the lens holding portion in the rotation direction is restricted by the rotation restricting means. doing. With this configuration, the optical lens can be moved to a designated position.

  On the other hand, in recent years, digital cameras have been rapidly increasing in magnification, and as a result, the number of lens groups and the extended length of the lens barrel are increased, resulting in an increase in the size of the digital camera. For this reason, there is a strong demand for reducing the thickness of the digital camera, and it is required to make the size of the lens barrel stored in the camera body as thin as possible.

  In order to reduce the thickness of the digital camera, it is conceivable to shorten the size of each lens barrel member constituting the lens barrel in the optical axis direction and connect the lens barrel members in a multistage configuration. However, it is difficult to dispose each lens barrel member without crossing a plurality of cams due to many restrictions.

  Various methods for solving the above problems have been proposed (see, for example, Patent Document 2). The zoom lens barrel of Patent Document 2 includes first, second, and third lens groups that move in the optical axis direction, a fixed barrel, and an intermediate barrel unit that moves forward and backward in the optical axis direction with respect to the fixed barrel. . Furthermore, a forward cylinder that advances and retracts in the optical axis direction with respect to the intermediate cylinder unit and holds the first lens group, and a movable cylinder that advances and retracts in the optical axis direction with respect to the intermediate cylinder unit and holds the second lens group. Prepare.

  The intermediate cylinder unit includes a rotating cylinder that rotates about the optical axis and has first and second cams formed on the outer surface and the inner surface thereof, and a first linear cylinder that moves straight in the optical axis direction and is disposed outside the rotating cylinder. And a second rectilinear cylinder arranged straight inside the rotating cylinder. The intermediate cylinder unit moves in the axial direction when the rotary cylinder rotates.

The advance cylinder has a first cam follower that engages with the first cam of the rotary cylinder, and the rotation is regulated by the first linear cylinder and guided in the axial direction. The moving cylinder has a second cam follower that engages with the second cam of the rotating cylinder, and its rotation is regulated by the second rectilinear cylinder and guided in the axial direction. In addition, the third lens group protrudes rearward from the cam cylinder.
JP 2001-324663 A Special registration 3842087

  The lens barrel disclosed in Patent Document 2 has a structure in which the third lens group protrudes backward with respect to the cam barrel. Therefore, for example, when a strong shock is applied to the lens barrel due to an impact such as a drop, the third lens group may be disengaged from the cam groove of the cam barrel due to the deflection of each component.

  Therefore, in order to prevent the lens group from falling off, it is necessary to increase the depth of engagement between the cam groove and the cam follower engaged therewith. In this case, it is necessary to increase the thickness of the cam cylinder accordingly. However, in recent years, miniaturization of cameras has progressed, and market demands are concentrated on small cameras. Therefore, there is a demand for the realization of a lens barrel that is strong against impacts such as dropping without increasing the size of the camera.

  An object of the present invention is to provide a lens barrel and an imaging apparatus that can prevent damage or destruction against an impact such as dropping.

In order to achieve the above-mentioned object, the present invention has a first follower pin on the outer periphery, a first lens unit equipped with a first lens and movable in the optical axis direction, and engaged with the first follower pin. A first cylindrical member having a first cam groove that follows the first follower pin in an inner peripheral portion, and the first lens unit is engaged with the first follower pin through the first cam groove; A linear movement restricting member that is disposed on the inner peripheral side of the first cylindrical member and restricts rotation when the first lens unit moves in the optical axis direction, and is disposed on the outer peripheral side of the first cylindrical member for rotation. Accordingly, the second cylindrical member for moving the first cylindrical member in the optical axis direction, the second cylindrical member coupled to the second cylindrical member and movable in the optical axis direction together with the second cylindrical member, Ring extending in the direction orthogonal to the optical axis A lens barrel including a fixing member, of the in the photographing state in which the first lens unit is protruded from the first cylindrical member, if no impact is applied from outside to the lens barrel, the first lens The lens holding part that is arranged on the image sensor side of the unit and protrudes toward the image sensor side is separated from the lens holding part that is arranged on the inner diameter side of the annular fixing member, and an impact is applied to the lens barrel from the outside. In this case, the lens held portion is held by the lens holding portion.

According to the present invention, in the shooting state in which the first lens unit protrudes from the first cylindrical member, when no impact is applied to the lens barrel from the outside, the first lens unit is disposed on the imaging element side of the first lens unit and protrudes toward the imaging element side. When the lens holding portion is separated from the lens holding portion disposed on the inner diameter side of the annular fixing member and an impact is applied to the lens barrel from the outside, the lens holding portion is brought into contact with the lens holding portion. Retained. This prevents damage to the lens barrel because it can prevent the follower pin of the lens unit (hereinafter referred to as “follower”) from falling out of the cam groove of the cylindrical member when an impact is applied to the lens barrel from the outside. And destruction can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 6 is a perspective view showing a state where the power of the photographing apparatus according to the embodiment of the present invention is turned off. FIG. 7 is a perspective view showing a state in which the power of the photographing apparatus is turned on. FIG. 8 is a top view of the photographing apparatus. FIG. 9 is a rear view of the photographing apparatus. FIG. 10 is a bottom view of the photographing apparatus.

  6 to 10, the imaging apparatus according to the present embodiment is configured as a digital camera having a zoom mechanism that can change the shooting magnification. On the front side of the housing 12 of the image pickup apparatus, a finder 17 that determines the composition of the subject, an auxiliary light source 16 that assists the light source in the case of photometry and distance measurement, a strobe 18, a photographing lens barrel (hereinafter referred to as a lens barrel). The lens unit 1 is disposed. On the upper surface side of the housing 12, a release button 13, a zoom changeover switch 14, and a power supply changeover button 15 are arranged. A card battery cover 28 that covers the tripod mounting portion 27, the memory card drive 42 (see FIG. 11), and a battery insertion portion (not shown) is disposed on the bottom surface side of the housing 12.

  A finder eyepiece 19, a display 20 including an LCD, and operation buttons 21, 22, 23, 24, 25, and 26 are arranged on the back side of the housing 12. The operation buttons 21 to 26 are used for switching various functions, and are operated when selecting an operation mode (such as a shooting mode, a reproduction mode, and a moving image shooting mode) of the imaging apparatus. The display 20 displays images corresponding to image data stored in the memory 40 (see FIG. 11) and image data read from the memory card. In addition, when the operation mode is selected, an image corresponding to a plurality of shooting data can be reduced and displayed on the display 20.

  FIG. 11 is a block diagram illustrating a configuration of a main part of the photographing apparatus.

  In FIG. 11, the imaging apparatus includes a focus mechanism 30, a shutter 33, a diaphragm 34, an imaging element 37, a CPU 46, in addition to the photographing lens barrel, the operation buttons 21 to 26, the display 20, and the like illustrated in FIGS. ROM 45, RAM 47, etc. are provided. Furthermore, the imaging apparatus includes a photometry unit and a distance measurement unit (not shown). The control system of the image pickup apparatus includes a CPU 46, a ROM 45, and a RAM 47, and a release button 13, operation buttons 21 to 26, a display 20, a memory 40, a memory card drive 42, a drive circuit 43, and the like are connected via a bus 44. Yes.

  The drive circuit 43 is connected to the zoom motor drive unit 29, the focus motor drive unit 31, the shutter drive unit 32, the aperture drive unit 35, the image sensor 37, and the strobe 18. These units are based on signals output from the control system. To control. The image sensor 37 is arbitrary such as a CCD type or a CMOS type. The ROM 45 stores a plurality of control programs for controlling each component shown in FIG. The RAM 47 stores data necessary for executing each control program. The CPU 46 executes the process shown in the flowchart of FIG. 12 based on the control program.

  When the user turns the power supply from OFF to ON by operating the power supply switching button 15 of the imaging apparatus, the CPU 46 reads a necessary control program from the ROM 45 and starts an initial operation. That is, the lens barrel is moved to a predetermined shootable area and the shooting function is activated to set the shooting standby state.

  When the user presses the release button 13 to take a picture, the CPU 46 detects the brightness of the subject by the image sensor 37 and emits the aperture value, shutter speed, and strobe 18 based on the photometric value measured by the photometric unit. Determine whether to do. In addition, the user can select in advance by operating the operation button 21 whether the strobe 18 is forced to emit light or not. Next, the CPU 46 measures the distance by the distance measuring unit, measures the distance between the imaging device and the subject, and drives the focus motor driving unit 31 to move the focus mechanism 30 to a predetermined focus position. .

  Next, the CPU 46 opens and closes the shutter 33, and takes in the light incident upon photographing to the image sensor 37. The image sensor 37 accumulates charges corresponding to the amount of incident light based on the exposure control value, and outputs the charges to the analog signal processing unit 36 as an image signal. The analog signal processing unit 36 performs analog processing on the image signal and outputs it to the A / D conversion unit 38. The A / D conversion unit 38 converts analog data into digital data and outputs the digital data to the digital signal processing unit 39. The digital signal processing unit 39 processes digital data. Finally, the digital data is stored in the memory 40 as image data.

  When the user operates the operation button 22, the CPU 46 subjects the image data stored in the memory 40 to compression processing such as JPEG or TIFF by the compression / decompression unit 41, and stores it in the memory card by the memory card drive 42. To do. If the imaging device is not equipped with the memory 40, the image data processed by the digital signal processing unit 39 is subjected to compression processing and the like and stored in a memory card.

  Further, the image data stored in the memory 40 and the image data stored in the memory card by the memory card drive 42 can be expanded by the compression / decompression unit 41, and the image can be displayed on the display 20 via the bus 44. . When the user determines that the image displayed on the display 20 is unnecessary, the user can delete the image by operating the operation button 23.

  When the user operates the zoom changeover switch 14, the CPU 46 drives the zoom motor (lens barrel drive motor) by the zoom motor drive unit 29 via the drive circuit 43 to move the lens barrel in the optical axis direction of the lens. Let Further, by operating the zoom switch 14, the image displayed on the display 20 can be enlarged and reduced (digital zoom).

  Next, a detailed configuration of the lens barrel provided in the imaging apparatus will be described.

  FIG. 1 is a cross-sectional view showing a wide-angle side photographing state of a lens barrel. FIG. 2 is a cross-sectional view showing a non-use state (accommodated state) of the lens barrel. FIG. 3 is a cross-sectional view showing a far side photographing state of the lens barrel. FIG. 4 is an exploded perspective view showing the configuration of the lens barrel. FIG. 5 is a perspective view showing the configuration of the lens unit and the fixing member that constitute the lens barrel.

1 to 5, the lens barrel can be expanded and contracted in the optical axis direction. The lens unit 1, the lens unit 2, the lens unit 3, the cylindrical member 4, the third cylindrical member 5, the second cylindrical member 6, and straight travel A regulating member 7, a fixing member 8, a drive ring 9, a fixed ring 10 and the like are provided.

  Each of the lens units 1 to 3 is a cylindrical member having an optical lens, and is configured to be movable in the optical axis direction. The lens unit 1 (second lens unit) includes six pin-shaped followers 1 a formed at intervals of 60 degrees in the circumferential direction, and is disposed on the outer peripheral side of the cylindrical member 4. The lens unit 2 includes three pin-shaped followers 2a that are integrally formed at intervals of 120 degrees in the circumferential direction. The lens unit 3 (lens unit) includes a lens held portion 3 a and a follower 3 b and is disposed on the inner peripheral side of the cylindrical member 4.

  The cylindrical member 4 includes a cam groove 4a, a cam groove 4b, and a cam groove 4c. A cam groove 4 c that engages with the follower 1 a of the lens unit 1 to follow the follower 1 a is formed on the outer peripheral portion of the cylindrical member 4. In the inner peripheral portion of the cylindrical member 4, a cam groove 4a that engages with the follower 2a of the lens unit 2 to follow the follower 2a, and a cam groove 4b that engages with the follower 3b of the lens unit 3 to follow the follower 3b. Is formed. The cam groove 4a, the cam groove 4b, and the cam groove 4c are each arranged in three places on the circumference. That is, the lens units 1 to 3 are engaged with the cylindrical member 4 through the respective followers and cam grooves.

  A rectilinear advance restricting member 7 is disposed on the inner peripheral side of the cylindrical member 4. The cylindrical member 4 is rotated along the outer peripheral surface of the rectilinear regulation member 7. The rectilinear restriction member 7 restricts rotation of the lens unit 1, the lens unit 2, and the lens unit 3 in the rectilinear direction (rotation when moving in the optical axis direction).

  A third cylindrical member 5 is disposed on the outer peripheral side of the cylindrical member 4 and the lens unit 1. Furthermore, a second cylindrical member 6 is disposed on the outer peripheral side of the third cylindrical member 5. The 2nd cylindrical member 6 is arrange | positioned at the outer peripheral side of the cylindrical member 4, and is a member for moving the cylindrical member 4 to an optical axis direction with rotation. The cylindrical member 4 and the third cylindrical member 5 are coupled in a bayonet shape, and move back and forth in the optical axis direction as the second cylindrical member 6 rotates.

  A fixed ring 10 is disposed on the outer peripheral side of the second cylindrical member 6. Further, a drive ring 9 is disposed on the outer peripheral side of the fixed ring 10. Further, a cover ring 11 is disposed on the outer peripheral side of the drive ring 9. The drive ring 9 is rotated by the drive of the zoom motor drive unit 29, the second cylindrical member 6 receives a rotational force by the rotation of the drive ring 9, and follows a cam groove (not shown) in the fixed ring 10 in the optical axis direction. Move back and forth.

  A fixed member 8 that is integral with the second cylindrical member 6 and moves in the optical axis direction is coupled to the rear portion in the optical axis direction of the second cylindrical member 6 in a bayonet shape. The fixing member 8 includes a lens holding portion 8 a that holds the lens held portion 3 a of the lens unit 3. The fixing member 8 is in a wide-angle side photographing state of the lens barrel (FIG. 1), that is, in a state where the lens unit 3 is moved to a predetermined positional relationship in the optical axis direction with respect to the cylindrical member 4 (a state where it protrudes backward). The lens unit 3 can be held.

  The fixing member 8 holds the lens unit 3 so that the follower 3b on the outer peripheral portion of the lens unit 3 does not fall off from the cam groove 4b on the inner peripheral portion of the cylindrical member 4 in the wide-angle side photographing state of the lens barrel. Further, the rotation of the fixed member 8 is restricted by the fixed ring 10. Further, the fixing member 8 restricts the rotation of the rectilinear regulating member 7 and the third cylindrical member 5 in the rectilinear direction (rotation when moving in the optical axis direction).

  In the wide-angle shooting state of the lens barrel (FIG. 1), the lens unit 2 moves forward in the optical axis direction with respect to the cylindrical member 4, and the lens unit 3 moves backward in the optical axis direction with respect to the cylindrical member 4. It is in the state. Here, the lens unit 3 is in a state of substantially projecting backward with respect to the cylindrical member 4 in the optical axis direction (right direction in FIG. 1).

  When an impact is applied to the lens barrel from the outside, a force acts to cause the follower 3b of the lens unit 3 to drop from the cam groove 4b (FIG. 4) of the cylindrical member 4 due to the action of moment. In this case, the lens unit 3 is dropped from the cylindrical member 4 by holding the lens held portion 3a (in the vicinity of the follower) disposed at the rear portion of the lens unit 3 by the lens holding portion 8a of the fixing member 8. Is to prevent.

  At the rear of the lens unit 3 in the optical axis direction, as shown in FIG. 5, three lens held portions 3a are equally arranged at intervals of 120 degrees in the circumferential direction. Further, behind the lens held portion 3a disposed in the lens unit 3 in the optical axis direction, as shown in FIG. 1, lens holding portions 8a provided integrally with the fixing member 8 are arranged at intervals of 120 degrees in the circumferential direction. Evenly arranged.

  The wide-angle side photographing state of the lens barrel in FIG. 1 shows the case of the widest angle, but the lens unit 3 is protruding rightward with respect to the cylindrical member 4, and the center of gravity is biased to the right. . Therefore, when an impact is applied to the lens barrel from the outside, a force that the follower 3b of the lens unit 3 tries to drop out from the cam groove 4b of the cylindrical member 4 is applied. Therefore, the lens held portion 3 a of the lens unit 3 is held by the lens holding portion 8 a of the fixing member 8 at a position where the follower 3 b of the lens unit 3 does not fall off from the cam groove 4 b of the cylindrical member 4. As a result, the lens barrel can be prevented from being damaged or destroyed when an external impact is applied to the lens barrel.

  Further, when the follower 3b of the lens unit 3 is weak in strength, the lens held portion 3a of the lens unit 3 is moved before the follower 3b is elastically broken (in the range of the elastic region (the range where no elastic breakage occurs)). It is held by the lens holding portion 8 a of the fixing member 8. As a result, the lens barrel can be prevented from being damaged or destroyed when an external impact is applied to the lens barrel.

  When the lens barrel is not in use in FIG. 2 or in the far side shooting state in FIG. 3, the lens unit 3 protrudes in the optical axis direction with respect to the cylindrical member 4 as in the wide angle side shooting state in FIG. It is not a biased state. Therefore, even if an external impact is applied, a large moment is not generated, so that the lens unit 3 does not fall off the cylindrical member 4.

  Therefore, the lens unit 3 and the fixing member 8 approach each other in a state where the lens unit 3 protrudes rightward with respect to the cylindrical member 4, that is, in the wide-angle side photographing state of FIG. 1 (the position where the angle of view of the lens barrel is the widest). Arrange as follows. As a result, the lens unit 3 is not dropped from the cylindrical member 4 when the lens barrel is in any of the states shown in FIGS.

  Next, processing after power-on of the imaging apparatus will be described with reference to FIG.

  FIG. 12 is a flowchart illustrating a sequence at the time of shooting after the imaging apparatus is powered on.

  In FIG. 12, when the user operates the power switch button 15 of the image pickup device to turn on the power (step S1), the CPU 46 causes the zoom motor drive unit 29 to set the zoom motor (lens barrel drive motor) to CW (clockwise). Rotate in the direction (step S2). Thereafter, the CPU 46 performs a predetermined operation of the lens barrel driving motor, and stops it when it is confirmed that the lens barrel has moved to the photographing position (step S3). At this time, the lens barrel changes from the state of FIG. 6 to the state of FIG.

  Next, when the user operates the release button 13 to be ON (step S4), the CPU 46 starts photometry by the photometry unit and obtains luminance information of the subject to be imaged (step S5). The CPU 46 determines whether or not the obtained luminance information is a high luminance higher than a predetermined luminance (step S6). When the luminance information is higher than the predetermined luminance, the CPU 46 inserts the diaphragm 34 into the optical axis by the diaphragm driving unit 35 and changes the amount of incident light (step S7). When the luminance information is a low luminance lower than the predetermined luminance, the diaphragm 34 is kept away from the optical axis without performing the insertion operation.

  Next, the CPU 46 operates the focus mechanism 30 by the focus driving unit 31 to move it to a position where the subject is in focus (step S8), and starts capturing an image of the subject at that position (step S9). Next, the CPU 46 operates the shutter 33 by the shutter drive unit 32 to set the open state to the closed state (step S10), blocks the amount of incident light, and ends the image capture (step S11).

  Thereafter, the CPU 46 retracts the diaphragm 34 from the optical axis by the diaphragm driving unit 35 (step S12), moves the focus mechanism 30 to the initial position by the focus driving unit 31 (step S13), and ends this process.

  As described above, according to the present embodiment, the following operations and effects are achieved. In the photographing state of the lens barrel on the wide angle side, that is, in a range where the follower 3b of the lens unit 3 does not fall off from the cam groove 4b of the cylindrical member 4, the lens holding portion of the lens unit 3 is held by the lens holding portion 8a of the fixing member 8. The part 3a can be held.

  This prevents the follower 3b of the lens unit 3 from dropping from the cam groove 4b of the cylindrical member 4 when an impact is applied to the lens barrel from the outside, thereby preventing damage or destruction of the lens barrel. be able to.

  In addition, since the fixing member 8 also has a function of restricting the rectilinear rotation of the rectilinear regulating member 7 and the third cylindrical member 5, it is possible to prevent damage or destruction of the lens barrel without using a dedicated component. Can do.

[Other Embodiments]
In the above embodiment, a digital camera is taken as an example of the imaging device, but the present invention is not limited to application to a digital camera. The present invention can be applied to either a digital camera or a film camera to which a lens barrel is attached.

It is sectional drawing which shows the wide angle side imaging | photography state of the lens barrel which concerns on embodiment of this invention. It is sectional drawing which shows the non-use state of a lens-barrel. It is sectional drawing which shows the far side imaging | photography state of a lens-barrel. It is a disassembled perspective view which shows the structure of a lens-barrel. It is a perspective view which shows the structure of the lens unit which comprises a lens-barrel, and a fixing member. It is a perspective view which shows the state which turned off the imaging device. It is a perspective view which shows the state which set the power supply of the imaging device to ON. It is a top view of an imaging device. It is a rear view of an imaging device. It is a bottom view of an imaging device. It is a block diagram which shows the structure of the principal part of an imaging device. It is a flowchart which shows the sequence at the time of imaging | photography after powering on an imaging device.

Explanation of symbols

1, 2 and 3 Lens unit 3a Lens held portion 3b Follower 4 Cylindrical member 4b Cam groove 5 Third cylindrical member 6 Second cylindrical member 7 Straight travel restricting member 8 Fixed member 8a Lens holding portion

Claims (4)

A first lens unit having a first follower pin on the outer periphery, equipped with a first lens, and movable in the optical axis direction;
A first cam groove that engages with the first follower pin to follow the first follower pin is provided on an inner peripheral portion, and the first lens unit is engaged via the first follower pin and the first cam groove. A first cylindrical member,
A rectilinear regulating member that is disposed on the inner peripheral side of the first cylindrical member and regulates rotation when the first lens unit moves in the optical axis direction;
A second cylindrical member disposed on the outer peripheral side of the first cylindrical member, and for moving the first cylindrical member in the optical axis direction with rotation;
An annular fixing member coupled to the second cylindrical member, movable in the optical axis direction together with the second cylindrical member, and extending in a direction orthogonal to the optical axis from a coupling portion with the second cylindrical member. A lens barrel,
In a shooting state where the first lens unit protrudes from the first cylindrical member, when no impact is applied to the lens barrel from the outside, the first lens unit is disposed on the image sensor side of the first lens unit and projects toward the image sensor side. When the lens held portion is separated from the lens holding portion disposed on the inner diameter side of the annular fixing member and an impact is applied to the lens barrel from the outside, the lens held portion is held by the lens holding portion. A lens barrel. A second follower pin disposed on the outer peripheral side of the first cylindrical member and engaged with a second cam groove disposed on the outer peripheral portion of the first cylindrical member is provided on the inner peripheral portion, and the second lens is provided. A second lens unit movable in the optical axis direction;
A third lens unit is disposed on the outer peripheral side of the second lens unit and on the inner peripheral side of the second cylindrical member, and is coupled to the first cylindrical member and moves in the optical axis direction as the second cylindrical member rotates. A cylindrical member,
2. The lens barrel according to claim 1, wherein the fixing member restricts rotation when the rectilinear advance restricting member and the third cylindrical member move in the optical axis direction.   The lens holding portions are arranged at intervals of 120 degrees in the circumferential direction of the lens barrel, and the lens holding portions are arranged at intervals of 120 degrees in the circumferential direction of the lens barrel. Item 3. The lens barrel according to Item 1 or 2.   An imaging apparatus comprising the lens barrel according to any one of claims 1 to 3.

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