JP5949437B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a lens barrel and an imaging apparatus.

There is a lens barrel in which a cam groove of a cam barrel is provided with an assembling region through which a cam pin is to be incorporated (see Patent Document 1).
[Patent Document 1] JP 2010-271524 A

  Since the built-in area does not contribute to the drive of the cam pin, the cam pin must be driven at a small rotation angle.

In the first aspect of the present invention, the first optical member has a detachable first cam pin protruding in the radial direction, and in a direction parallel to the optical axis of the first optical member while holding the first optical member. a first holding member which moves to engage the first cam pin, a first cam groove for driving the first holding member in the direction of the optical axis of the first optical member, and, extending from one end of the first cam groove a lens barrel Ru and a drive cylinder having an extended groove arranged Te, formed in the extension grooves, in the radial direction of the first cam pins drive cylinder when attaching and detaching the first cam pin to the first holding member have a first maintenance hole that passes, the driving of the first cam pin in extension groove, a lens barrel lens barrel corresponds to a collapsed section is shortened in the optical axis direction is provided.

  In the second aspect of the present invention, an imaging apparatus including the lens barrel is provided.

  The above summary of the present invention does not enumerate all necessary features of the present invention. Sub-combinations of these feature groups can also be an invention.

1 is a schematic cross-sectional view of a single-lens reflex camera 100. FIG. 2 is a schematic cross-sectional view of a lens unit 200. FIG. 2 is a partial cross-sectional view of a lens unit 200. FIG. FIG. 6 is a development view of the cam cylinder 205. FIG. 4 is a partial development view of a cam cylinder 205.

  Hereinafter, the present invention will be described through embodiments of the invention. The following embodiments do not limit the invention according to the claims. Not all combinations of features described in the following embodiments are essential for the solution of the invention.

  FIG. 1 is a schematic cross-sectional view of a single-lens reflex camera 100. The single-lens reflex camera 100 includes a lens unit 200 and a camera body 300.

  For the purpose of simplifying the description, in the following description, the object side with respect to the lens unit 200 attached to the camera body 300 is described as the front side or the front side of the single-lens reflex camera 100. Further, the side far from the object with respect to the lens unit 200 is referred to as a rear side or a back side in the single-lens reflex camera 100.

  The lens unit 200 has an optical system including a first lens group 210, a second lens group 220, a third lens group 230, and a fourth lens group 240 arranged along the optical axis X. The first lens group 210, the second lens group 220, the third lens group 230, and the fourth lens group 240 are individually held by individual lens holding frames 212, 222, 232, and 242, respectively.

  The illustrated lens unit 200 is in a retracted state in which the first lens group 210, the second lens group 220, the third lens group 230, and the fourth lens group 240 are close to each other. Thereby, the length of the lens unit 200 in the optical axis X direction is shortened and the portability is improved, but the function as the optical device cannot be used.

  The lens unit 200 has a lens barrel including a fixed cylinder 201, a zoom ring 202, a rectilinear cylinder 203, a front cylinder 204, a cam cylinder 205, a guide cylinder 206, a first moving frame 207 and a second moving frame 209. The fixed cylinder 201 has a lens side mount 208 at the rear end. The fixed cylinder 201 is coupled to the camera body 300 by coupling the lens side mount unit 208 to the body side mount unit 360 on the front surface of the camera body 300.

  The coupling between the lens side mount portion 208 and the body side mount portion 360 can be released. Therefore, the camera body 300 can be used in combination with another lens unit 200 having the lens side mount portion 208 that conforms to the standard.

  The zoom ring 202 is disposed on the outer peripheral surface of the fixed cylinder 201, and is rotated about the optical axis X of the optical system as a rotation axis by a user operation. The zoom ring 202 is engaged with the straight cylinder 203 and the cam cylinder 205 by a cam groove, a straight groove, or the like formed on the inner surface. The rectilinear cylinder 203 moves in the optical axis X direction with respect to the fixed cylinder 201. The cam cylinder 205 moves in the direction of the optical axis X along with the rectilinear cylinder 203 while rotating together with the zoom ring 202.

  The guide cylinder 206 located inside the cam cylinder 205 is coupled to the fixed cylinder 201 and does not move relative to the fixed cylinder 201. Therefore, the cam cylinder 205 moves in the optical axis X direction also with respect to the guide cylinder 206.

  The front tube 204 is engaged with and supported by the straight tube 203 and the cam tube 205. Accordingly, the leading cylinder 204 moves in the optical axis X direction in accordance with the movement of the rectilinear cylinder 203 and the cam cylinder 205 with respect to the fixed cylinder 201.

  Further, the leading cylinder 204 is driven between the rectilinear cylinder 203 that moves in the optical axis X direction without rotating and the cam cylinder 205 that moves in the optical axis X direction while rotating, and the rectilinear cylinder 203 and the cam cylinder are driven. Also move to 205. Since the front tube 204 supports the lens holding frame 212 that holds the first lens group 210 at the tip, the first lens group 210 also moves as the front tube 204 moves.

  The first moving frame 207 and the second moving frame 209 have cam pins 283 and 284 that engage with cam grooves formed in the cam cylinder 205, respectively. It moves individually in the direction of the optical axis X. Accordingly, the first moving frame 207 moves the lens holding frame 222 holding the second lens group 220 in the optical axis light direction. The second moving frame 209 is connected to a lens holding frame 242 that holds the fourth lens group 240 and moves the fourth lens group 240 in the optical axis X direction.

  Further, the lens holding frame 232 that holds the third lens group 230 is driven by a feed screw assembly 270 that is fixed to the lens holding frame 242 that holds the fourth lens group 240, so that the lens holding frame 242 is not moved. And is further movably supported. The feed screw assembly 270 includes a stepping motor 272, a feed screw 274 and a frame 276.

  The frame 276 integrally supports the stepping motor 272 and the feed screw 274 and is fixed to the lens holding frame 242. The stepping motor 272 drives the feed screw 274 to rotate. The feed screw 274 engages with the lens holding frame 232 via the rack member 278.

  Thereby, the third lens group 230 held by the lens holding frame 232 can be moved. When the third lens group 230 moves, the focal position of the optical system of the lens unit 200 changes. Therefore, the lens unit 200 can be focused by electrically controlling the stepping motor 272 based on the signal from the camera body 300 side.

  The camera body 300 includes a mirror unit 370 disposed behind the body side mount portion 360. A focusing optical system 380 is disposed below the mirror unit 370. A focusing screen 352 is disposed above the mirror unit 370.

  A pentaprism 354 is disposed further above the focusing screen 352, and a finder optical system 356 is disposed behind the pentaprism 354. The rear end of the viewfinder optical system 356 is exposed as a viewfinder 350 on the back surface of the camera body 300.

  Behind the mirror unit 370, a shutter unit 310, a low-pass filter 332, an image sensor 330, a substrate 320, and a display unit 340 are sequentially arranged. A display unit 340 formed by a liquid crystal display panel or the like appears on the back surface of the camera body 300. A control unit 322, an image processing unit 324, and the like are mounted on the substrate 320.

  The mirror unit 370 includes a main mirror 371 and a sub mirror 374. The main mirror 371 is supported by a main mirror holding portion 372 that is pivotally supported by a main mirror rotating shaft 373.

  The sub mirror 374 is supported by a sub mirror holding portion 375 that is pivotally supported by a sub mirror rotating shaft 376. The sub mirror holding unit 375 rotates with respect to the main mirror holding unit 372. Therefore, when the main mirror holding part 372 rotates, the sub mirror holding part 375 is also displaced together with the main mirror holding part 372.

  When the front end of the main mirror holding portion 372 is lowered, the main mirror 371 is positioned obliquely on the incident light beam incident from the lens unit 200. When the main mirror holding part 372 moves up, the main mirror 371 retracts to a position avoiding the incident light beam.

  When the main mirror 371 is positioned on the incident light beam, the incident light beam incident through the lens unit 200 is reflected by the main mirror 371 and guided to the focusing screen 352. The focusing screen 352 is disposed at a position conjugate with the optical system of the lens unit 200, and visualizes an image formed by the optical system of the lens unit 200.

  The image on the focusing screen 352 is observed from the viewfinder 350 through the pentaprism 354 and the viewfinder optical system 356. Here, an erect image can be observed from the viewfinder 350 by observing the image through the pentaprism 354.

  The photometric sensor 390 is disposed above the finder optical system 356 and receives a part of the branched incident light beam. The photometric sensor 390 detects the subject brightness and causes the control unit 322 to calculate an exposure condition that is a part of the photographing condition.

  The main mirror 371 has a half mirror region that transmits a part of the incident light beam. The sub mirror 374 reflects a part of the incident light beam incident from the half mirror region toward the focusing optical system 380. The focusing optical system 380 guides a part of the incident incident light beam to the focus detection sensor 382. Thereby, the control unit 322 determines the target position of the lens that moves when the optical system of the lens unit 200 is focused.

  When the release button is half-pressed in the single-lens reflex camera 100 including the lens unit 200 and the camera body 300 as described above, the focus detection sensor 382 and the photometric sensor 390 are enabled, and a subject image can be taken under appropriate shooting conditions. It becomes a state. Next, when the release button is fully pressed, the main mirror 371 and the sub mirror 374 move to the retracted position, and the shutter unit 310 is opened. Thereby, the incident light beam incident from the lens unit 200 passes through the low-pass filter 332 and enters the image sensor 330.

  FIG. 2 is a partial cross-sectional view showing another state of the lens unit 200, and shows a cross section of the lens unit 200 that has been scaled to the wide-angle side on the upper side in the drawing relative to the optical axis X. In addition, in FIG. 2, a cross section of the lens unit 200 that is zoomed to the telephoto side is shown below the optical axis X in the drawing.

  In FIG. 2, the same reference numerals are assigned to the same elements as those in FIG. However, although FIG. 2 is common to FIG. 1 in that it is a cross section including the optical axis X, a cross section different from FIG. 1 is shown. Even if it is an element common to FIG. May appear in different shapes.

  In the lens unit 200, the rectilinear cylinder 203 engages with the zoom ring 202 at the lead portion 281. Since the rectilinear cylinder 203 is restrained from rotating with respect to the fixed cylinder 201, when the zoom ring 202 is rotated, the driving force moving in the optical axis X direction is received from the zoom ring 202.

  The cam cylinder 205 is engaged in the vicinity of the rear end of the rectilinear cylinder 203 by a bayonet claw 286 disposed in the vicinity of the rear end of the cam cylinder 205. The bayonet claw 286 engages with a bayonet groove extending in the circumferential direction on the inner surface of the rectilinear cylinder 203, so that the cam cylinder 205 can rotate around the optical axis X. However, when the rectilinear cylinder 203 moves in the optical axis X direction, the cam cylinder 205 also moves in the optical axis direction along with the rectilinear cylinder 203. In other words, the cam cylinder 205 and the rectilinear cylinder 203 are engaged only in the optical axis X direction.

  The cam cylinder 205 engages with a groove provided on the inner surface of the zoom ring 202 in parallel with the optical axis X through a connecting pin 285 fixed to the outer peripheral surface of the cam cylinder 205. Thereby, when the zoom ring 202 is rotated, the cam cylinder 205 also rotates.

  As already described, when the zoom ring 202 is rotated, the rectilinear cylinder 203 moves in the direction of the optical axis X, and the cam cylinder 205 moves along with the rectilinear cylinder 203. Therefore, when the zoom ring 202 is rotated, the cam cylinder 205 moves in the optical axis X direction while rotating around the optical axis X.

  The guide tube 206 is positioned inside the cam tube 205 and is coupled to the fixed tube 201 and fixed. Therefore, when the zoom ring 202 is rotated, the rectilinear cylinder 203 and the cam cylinder 205 also move relative to the guide cylinder 206. Since the guide tube 206 extends toward the front end side of the lens unit 200 in the direction of the optical axis X, the guide tube 206 supports the cam tube 205 from the inner surface side and is associated with a key 287 provided at the rear end of the rectilinear tube 203. The rectilinear groove 288 is joined to suppress the rotation of the rectilinear cylinder 203.

  The front tube 204 supports the lens holding frame 212 of the first lens group 210 at the tip. Further, the front tube 204 is supported from both sides by engaging with the straight tube 203 and the cam tube 205 by a cam pin 282 or the like. Therefore, when the rectilinear cylinder 203 and the cam cylinder 205 move in the optical axis X direction, the leading cylinder 204 also moves in the optical axis X direction accordingly.

  Further, when the zoom ring 202 is rotated, the front tube 204 is between the rectilinear tube 203 that moves in the optical axis X direction without rotating and the cam tube 205 that moves in the optical axis X direction while rotating. When driven, the linear movement cylinder 203 and the cam cylinder 205 are also moved in the optical axis X direction. As a result, the first lens group 210 held at the tip of the front tube 204 is largely extended forward from the fixed tube 201.

  As described above, when the zoom ring 202 is rotated, the first lens group 210, the second lens group 220, the third lens group 230, and the fourth lens group 240 individually move with respect to the fixed cylinder 201. . Thereby, the magnification of the optical system formed in the lens unit 200 changes according to the rotation amount of the zoom ring 202. In addition, when the zoom ring 202 is rotated beyond the zooming range of the lens unit 200, the lens unit 200 is in a retracted state.

  FIG. 3 is a partially enlarged view of another lens unit 200. Similarly to the lens unit 200, the lens unit 200 also includes a first moving frame 207 and a second moving frame 209 that move individually. Elements having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.

  In the lens unit 200, the first moving frame 207 supports and integrally couples the lens holding frame 242 that holds the fourth lens group 240 and the lens holding frame 252 that holds the fifth lens group 250 together. . The first moving frame 207 is engaged with a cam groove 293 formed in the cam cylinder 205 at the cam pin 283. The cam cylinder 205 is rotationally driven by the zoom ring 202 as already described. Further, the first moving frame 207 is restricted from rotating with respect to the fixed cylinder 201. Therefore, when the zoom ring 202 is rotated in the lens unit 200, the first moving frame 207 moves the lens holding frames 242 and 252 integrally in the optical axis X direction of the lens unit 200.

  The second moving frame 209 holds a lens holding frame 262 that holds the sixth lens group 260. The second moving frame 209 is engaged with a cam groove 294 formed in the cam cylinder 205 at the cam pin 284. Further, the second moving frame 209 is restricted from rotating with respect to the fixed cylinder 201. Therefore, when the cam cylinder 205 is rotated by operating the zoom ring 202, the second moving frame 209 moves the lens holding frame 262 in the optical axis X direction of the lens unit 200.

  FIG. 4 is a development view of the cam cylinder 205, and shows the shapes of the cam grooves 293 and 294 formed on the inner surface of the cam cylinder 205 from the outside of the cam cylinder 205. The upper side in the figure corresponds to the front end side of the lens unit 200.

  In the cam cylinder 205, three cam grooves 293 having a cam profile that is closed without reaching the end of the cam cylinder 205 are engaged with the cam pins 283 of the first moving frame 207. The three cam grooves 293 have the same cam profile, and are arranged at positions shifted in the circumferential direction of the cam cylinder 205.

  Similarly, in the cam cylinder 205, three cam grooves 294 having a cam profile that is closed without reaching the end of the cam cylinder 205 engage with the cam pins 284 of the second moving frame 209. The three cam grooves 294 have the same cam profile, and are arranged at positions shifted in the circumferential direction of the cam cylinder 205.

  The first moving frame 207 and the second moving frame 209 also have three cam pins 283 and 284 arranged in the circumferential direction corresponding to the three cam grooves 293 and 294. As a result, the first moving frame 207 and the second moving frame 209 are simultaneously driven at a plurality of locations on the circumference and smoothly driven without being inclined with respect to the optical axis X.

  In the cam cylinder 205, each of the cam grooves 293 and 294 has a maintenance hole 299. Each of the maintenance holes 299 has a size that allows the cam pins 283 and 284 engaged with the cam grooves 293 and 294 to be inserted while being held by the holding tool.

  Accordingly, when the lens unit 200 including the first moving frame 207 and the second moving frame 209 and the cam cylinder 205 is assembled, the first moving frame 207 and the second moving frame 209 inserted inside the cam cylinder 205 are arranged. On the other hand, the cam pins 283 and 284 can be assembled through the maintenance hole 299. Therefore, the cam grooves 293 and 294 do not have to be provided with an opening at the end of the cam cylinder 205 in order to incorporate the cam pins 283 and 284.

  By the way, the cam surfaces of the cam grooves 293 and 294 have an inclination in which the width becomes wider toward the inside in the radial direction of the cam cylinder 205. Such an inclination is inevitably formed in order to remove the mold in the process of forming the cam cylinder 205.

  Therefore, the cam pins 283 and 284 engaged with the cam grooves 293 and 294 have peripheral surfaces inclined in a complementary manner to the inclination of the cam surfaces of the cam grooves 293 and 294, and have a shape in which the diameter gradually increases or decreases in the height direction. Have Therefore, each of the maintenance holes 299 is larger than the maximum diameter of the cam pins 283 and 284, and the positioning of the cam pins 283 and 284 by the cam grooves 293 and 294 becomes unstable at the position where the maintenance holes 299 are provided.

Here, paying attention to the three cam grooves 293 engaged with the cam pins 283 of the first moving frame 207, from the positions E ₁ , E ₂ , E _{3 of the} left end in the figure of the movement range of the cam pins 283 in each of the cam grooves. The distances P ₁ , P ₂ , P ₃ to the positions I ₁ , I ₂ , I ₃ of the cam pins 283 when inserted into the maintenance holes 299 are different for each cam groove 293. Similarly, the three cam grooves 294 that engage with the cam pins 284 of the second moving frame 209 are also inserted into the maintenance holes 299 from the left end positions E ₁ , E ₂ , E _{3 in} the drawing of the movement range of the cam pins 284. The distances P ₁ , P ₂ , and P _{3 to} the positions I ₁ , I ₂ , and I ₃ of the cam pins 284 are different for each cam groove 294.

Thereby, in each cam groove 293, 294, even if the positioning accuracy of the cam pins 283, 284 is lowered at the positions I ₁ , I ₂ , I ₃ of the maintenance hole 299, the cam grooves 293, 294 in a set of three The cam pins 283 and 284 are prevented from coming to the positions I ₁ , I ₂ and I ₃ of the maintenance hole 299 at the same time. Therefore, even if the maintenance hole 299 is provided in the middle of the cam grooves 293 and 294, the positioning accuracy of the first moving frame 207 and the second moving frame 209 is maintained.

Further, in the cam cylinder 205, the vicinity of the right end of the left cam grooves 293 and 294 in the drawing is the length D _{1 in the} vicinity of the left end of the second cam grooves 293 and 294 from the left in the drawing and the circumferential direction of the cam cylinder 205. Overlaid over. Further, the left ends of the cam grooves 293 and 294 partially drawn at the right end in the drawing are in the vicinity of the right end of the third cam grooves 293 and 294 from the left in the drawing and over the length D ₂ in the circumferential direction of the cam cylinder 205. Overlapping.

  As described above, the cam grooves 293 and 294 in the cam cylinder 205 do not have an extension portion communicating with the opening at the end of the cam cylinder 205, and thus can be arranged in the circumferential direction of the cam cylinder 205. Therefore, the cam grooves 293 and 294 having a long cam profile can be formed by efficiently using the peripheral surface of the cam cylinder 205 having a limited peripheral length.

  In addition, by making the cam profile longer, the inclination of the cam profile can be made gentle and the operation of the zoom ring 202 can be made smooth. Further, when the zoom of the lens unit 200 is motorized, the load on the actuator can be reduced, which contributes to miniaturization and noise reduction.

  Further, the cam grooves 293 and 294 are both closed without reaching the end of the cam cylinder 205. Therefore, even if a long cam profile is formed, a reduction in the strength of the cam cylinder 205 is suppressed.

  FIG. 5 is a development view in which the cam cylinder 205 is partially enlarged, and shows a region indicated by a dotted line A in FIG. Elements that are the same as those in FIG. 4 are given the same reference numerals, and redundant descriptions are omitted.

  When attention is paid to one of a set of three cam grooves 293 and 294, each cam profile of the cam grooves 293 and 294 includes a zooming section and a retracting section. The retractable section is formed as an extended groove extending from one end of the variable power section.

  When the cam pins 283 and 284 are driven in the zooming section of the cam grooves 293 and 294, the optical system of the lens unit 200 is zoomed and the shooting angle of view of the single-lens reflex camera 100 is changed. In other words, by maintaining the positioning accuracy of the cam pins 283 and 284 by the cam grooves 293 and 294 high in the zooming section, the optical axis performance of the lens unit 200 is kept high, and the imaging quality of the single-lens reflex camera 100 is improved. Can do.

  When the cam pins 283 and 284 are driven in the retracted sections of the cam grooves 293 and 294, the lens unit 200 is shortened in the direction of the optical axis X, excluding the function of the optical system. Therefore, when the cam pins 283 and 284 are driven by the retracted sections of the cam grooves 293 and 294, the positioning accuracy of the cam pins 283 and 284 does not affect the optical performance. Therefore, the maintenance hole 299 is preferably arranged in the retracted section of each cam groove 293, 294.

Further, in the cam grooves 293 and 294 that drive the first moving frame 207 and the second moving frame 209 that are different from each other, the maintenance hole 299 may be arranged at the same position I ₃ in the circumferential direction of the cam cylinder 205. As a result, when the cam pins 283 and 284 are incorporated into the lens unit 200, the number of rotations of the cam cylinder 205 or the first moving frame 207 and the second moving frame 209 can be reduced to improve the productivity of the lens unit 200. it can.

  The single-lens reflex camera 100 has been described above as an example, but the above-described structure can be applied to a non-reflex camera that does not include a quick return mirror. Furthermore, in addition to a camera in which the lens unit 200 and the camera body 300 are integrally formed, the above structure can be applied to a telescope, a surveying instrument, a microscope, and the like that include an optical member that is driven by a cam mechanism.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Single-lens reflex camera, 200 Lens unit, 201 Fixed cylinder, 202 Zoom ring, 203 Straight advance cylinder, 204 First cylinder, 205 Cam cylinder, 206 Guide cylinder, 207 First moving frame, 208 Lens side mount part, 209 Second moving frame , 210 First lens group, 212, 222, 232, 242, 252, 262 Lens holding frame, 220 Second lens group, 230 Third lens group, 240 Fourth lens group, 250 Fifth lens group, 260 Sixth lens Group, 270 Lead screw assembly, 272 Stepping motor, 274 Feed screw, 276 Frame, 278 Rack member, 281 Lead part, 282, 283, 284 Cam pin, 285 Connecting pin, 286 Bayonet claw, 287 key, 288 Straight groove, 293 294 Cam groove, 299 Maintenance hole, 300 turtles Labody, 310 shutter unit, 320 substrate, 322 control unit, 324 image processing unit, 330 imaging device, 332 low-pass filter, 340 display unit, 350 finder, 352 focusing screen, 354 pentaprism, 356 finder optical system, 360 body side mount , 370 mirror unit, 371 main mirror, 372 main mirror holding part, 373 main mirror rotation axis, 374 sub mirror, 375 sub mirror holding part, 376 sub mirror rotation axis, 380 focusing optical system, 382 focus detection sensor, 390 photometry Sensor

Claims (4)

A first holding member that protrudes in a radial direction of the first optical member, has a detachable first cam pin, and moves in a direction parallel to the optical axis of the first optical member while holding the first optical member; ,
Engaged with the first cam pin, a first cam groove for driving the front Symbol first holding member in the direction of the optical axis of the first optical member, and arranged to extend from one end of the first cam groove a lens barrel Ru and a drive cylinder with extended grooves,
Wherein formed on the extension groove, it has a first maintenance hole for passing the first cam pin when attaching and detaching the first cam pin to the first holding member in a radial direction of the drive cylinder,
The driving of the first cam pin in the extension groove is a lens barrel corresponding to a retracted section in which the lens barrel is shortened in the optical axis direction . The first holding member has a second cam pin that protrudes in the radial direction and is different from the first cam pin,
The drive cylinder includes a second cam groove different from the first cam groove engaged with the second cam pin, and a second cam pin corresponding to a state in which the first cam pin is located at a position different from the first maintenance hole. The lens barrel according to claim 1, wherein the lens barrel is formed at a position as a part of the second cam groove, and allows the second cam pin to pass when the second cam pin is attached to and detached from the first holding member. A second optical member different from the first optical member;
A second holding member that has a third cam pin protruding in a radial direction of the second optical member and moves in a direction parallel to the optical axis while holding the second optical member;
The drive cylinder is formed as a third cam groove that engages with the third cam pin and drives the second holding member in the direction of the optical axis, and is formed as a part of the third cam groove. Having a third maintenance hole that allows the cam pin to pass when attached to and detached from the second holding member;
3. The lens barrel according to claim 1, wherein the third maintenance hole is arranged at a position of the third cam pin corresponding to a state in which the first cam pin is located at the position of the first maintenance hole. The imaging device provided with the lens barrel as described in any one of Claim 1- Claim 3 .

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