JP5757834B2 - Lens barrel and imaging device - Google Patents

Description

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

  Currently, digital cameras are widely used. In digital cameras, there is a demand for ever-increasing image quality along with downsizing and thinning. As one of digital cameras that meet this need, an imaging apparatus having a retractable lens barrel has been proposed. Such a lens barrel has a plurality of cylindrical bodies arranged coaxially, and includes a barrel that is extended and retracted. The lens barrel houses an optical system. The lens barrel can be shortened by retracting a plurality of cylinders at times other than when photographing, and thus the imaging apparatus can be miniaturized.

  As the lens barrel, a variable power lens group that performs variable power adjustment, a focus lens group that performs focus adjustment, and other lens groups are housed side by side in the direction of the optical axis in a lens barrel, and further, light quantity control such as a shutter or a diaphragm A member is provided. The imaging apparatus includes a solid-state imaging device, and obtains an image by forming an image of light incident on the lens barrel on an imaging surface of the solid-state imaging device.

  Currently, as a lens barrel, in order to avoid the lens groups from interfering when retracted, part of the plurality of lens groups is retracted to a position off the optical axis, and the lens barrel is further shortened. Something that makes it possible has been proposed.

  Patent Document 1 describes a digital camera including a lens barrel that includes first to fourth lens groups and retracts the third lens group to a position that deviates from the optical axis. This digital camera holds the retractable lens group at the shooting position by magnetic force when the lens barrel is in the shooting state. In such a configuration, it is necessary to provide a magnetic body for holding the retractable lens group by magnetic force, and there is room for improvement in that the configuration becomes complicated.

  In Patent Document 2, a plurality of lens groups are provided. The retractable lens group is retracted from the photographing optical axis with the transition to the retracted state, and the retractable lens group is placed on the photographing optical axis with the transition to the photographing state. A lens barrel having a lens advance / retreat mechanism for advancement is described. The lens barrel includes a spring member that rotates the retractable lens group in a predetermined first rotation direction, and a first rotation direction that resists the biasing force of the spring member as the tube length changes. And a cam mechanism that rotates in a reverse second rotation direction. In such a configuration, since the mechanism for rotating the retractable lens group in each of the first rotation direction and the second rotation direction is different, there is room for improvement in that the configuration becomes complicated.

JP 2010-145757 A JP 2006-91910 A

  By the way, in a lens barrel having a mechanism for retracting the lens group, in a normal photographing state, the retracted lens group is held at a position on the optical axis, and when the lens barrel is retracted, the lens group retracted at the retracted position is held. Need to hold.

  The present invention has been made in view of the above circumstances, and provides a lens barrel and an imaging apparatus that have a simple structure and can reliably hold the lens group at both the retracted position and the photographing position. It will be.

A lens barrel that includes a plurality of cylinders that can be extended and retracted in a nested manner, and retracts by retracting the plurality of cylinders that have been extended.
An optical system including a plurality of lens groups housed in the lens barrel;
A lens group disposed on the optical axis in a state in which the plurality of cylindrical bodies are extended, the lens holding unit holding the lens group retracted to a position deviated from the optical axis when the lens barrel is retracted; ,
A toggle mechanism for holding the position of the lens holder by a biasing force of a spring in a state where the lens barrel is retracted and a state where the lens barrel is extended;
An engagement member that is displaced as the lens barrel is retracted and extended, engages with the lens holder, and moves the lens holder between a position on the optical axis and a position off the optical axis. And comprising
The toggle mechanism switches the direction of the biasing force of the spring at a predetermined position of the moving lens holder,
One end of the spring is locked to a holder that slidably holds the lens holder, and the other end of the spring is locked to the lens group that is retracted to a position off the optical axis.
The lens holding body is moved by the engagement member until the predetermined position where the direction of the biasing force of the spring is switched, and is moved by the biasing force of the spring after the predetermined position is exceeded .

  According to the present invention, it is possible to provide a lens barrel and an imaging apparatus that have a simple structure and can reliably hold the lens group at both the retracted position and the photographing position.

1 is an external perspective view illustrating an example of an imaging apparatus for explaining an embodiment of the present invention. It is an external appearance perspective view which shows the imaging device of FIG. 1 in the state by which the lens barrel was extended to the tele end. It is a perspective view which shows the internal structure of the imaging device of FIG. 1 in the state which the lens barrel retracted to the retracted position. It is sectional drawing which shows the internal structure of the imaging device of FIG. 1 in the state which the lens barrel retracted to the retracted position. It is sectional drawing which shows the internal structure of the imaging device of FIG. 1 in the state by which the lens barrel was extended to the wide end. It is sectional drawing which shows the internal structure of the imaging device of FIG. 1 in the state by which the lens barrel was extended to the tele end. It is a perspective view which decomposes | disassembles and shows the lens barrel of FIG. It is an external appearance perspective view which shows the structure of the 3 group unit containing a 3rd lens group. It is an external appearance perspective view which shows the structure of the 3 group unit containing a 3rd lens group. It is a perspective view which decomposes | disassembles and shows the 3 group unit containing a 3rd lens group. It is an external appearance perspective view which shows the mechanism which slides a 3rd lens group. It is a figure explaining a movement of the 3rd lens group when a lens barrel is extended from a retracted position to a wide end. It is a figure explaining the movement of the 3rd lens group when a lens barrel is drawn from a wide end to a retracted position.

  FIG. 1 shows an example of an imaging apparatus. FIG. 1 shows the lens barrel retracted to the retracted position when not in use. FIG. 2 is an external perspective view showing the imaging apparatus of FIG. 1 in a state where the lens barrel is extended to the telephoto end.

  The imaging apparatus 1 includes a lens barrel 2 that houses an optical system, and an imaging unit (not shown) that includes a solid-state imaging device such as a CCD or CMOS.

  The lens barrel 2 includes a main body 6 having a first cylinder 3, a second cylinder 4, a third cylinder 5, and a housing cylinder 30 that is fitted on the outermost third cylinder 5. Contains. The third cylinder 5 is relative to the main body 6, the second cylinder 4 is relative to the third cylinder 5, and the first cylinder 3 is relative to the second cylinder 4 in the optical axis direction (in the drawing). (In the direction of arrow Z), and further. As the first cylinder 3, the second cylinder 4, and the third cylinder 5 are extended and retracted, the lens barrel 2 is extended and retracted.

  The imaging unit is attached to the rear side (image side) of the lens barrel 2.

  3 to 6 show the internal structure of the imaging apparatus 1. In FIG. 3, the lens barrel is shown in the retracted position. FIG. 4 shows a state where the lens barrel is retracted to the retracted position. FIG. 5 shows a state where the lens barrel is extended to the wide end. FIG. 6 shows a state where the lens barrel is extended to the telephoto end.

  The optical system housed in the lens barrel 2 includes a first lens group 101, a second lens group 201, a shutter 701, a third lens group 301, and a fourth lens group 401. These optical elements are arranged on the front side (subject From the side) in this order.

  The first group unit 100 including the first lens group 101 is accommodated in the first cylinder 3. The second group unit 200 including the second lens group 201 is accommodated in the second cylinder 4. The shutter unit 700 including the shutter 701 and the third group unit 300 including the third lens group 301 are accommodated in the third cylinder 5. The fourth group unit 400 including the fourth lens group 401 is attached to the rear part of the main body 6, and the fourth lens group 401 is accommodated in the accommodating cylinder 30 of the main body 6.

  The first lens group 101, the second lens group 201, and the third lens group 301 constitute a zoom optical system for adjusting the zoom magnification, that is, the focal length. The first lens group 101 and the second lens group 201 are variable power lens groups, and the third lens group 301 is a correction system lens group. As the lens barrel 2 is extended and retracted, the first lens group 101 and the second lens group 201 move back and forth along the optical axis, thereby changing the focal length. In synchronism with this, the third lens group 301 also advances and retreats along the optical axis, thereby suppressing the change in the focal position due to zooming.

  The shutter 701 controls exposure by opening and closing. In some cases, the opening can be varied to double as an aperture. The shutter 701 is disposed adjacent to the subject side of the third lens group 301 so that a substantially constant interval is provided between the shutter 701 and the third lens group 301 as the lens barrel 2 is extended and retracted. Next, it advances and retreats along the optical axis.

  The fourth lens group 401 constitutes an optical system for finally forming an image. The position of the fourth lens group 401 is unchanged regardless of the extension of the lens barrel 2 while the lens barrel 2 is extended from the tele end to the wide end.

  A solid-state imaging device included in an imaging unit (not shown) is disposed at the image formation point of the optical system.

  As shown in FIGS. 3 and 4, when the lens barrel 2 is retracted to the retracted position, the third lens group 301 includes other optical elements (the first lens group 101, the second lens group 201, the shutter). 701, retracted to a position off the optical axis of the fourth lens group 401).

  A fourth lens group 401 is disposed in a space generated by retracting the third lens group 301, and the third lens group 301 and the fourth lens group 401 are substantially orthogonal to the optical axis (Y direction in the figure). Are lined up.

  Hereinafter, the retracting mechanism of the lens barrel 2, that is, the feeding and feeding mechanism of the first cylinder 3, the second cylinder 4, and the third cylinder 5, will be described, and the feeding and feeding of the lens barrel 2 together. The advance / retreat mechanism of the optical elements (the first lens group 101, the second lens group 201, and the third lens group 301) that advance and retreat along the optical axis will be described.

  FIG. 7 shows a state in which the lens barrel 2 is disassembled.

  The feeding and feeding mechanism of the lens barrel 2 will be described.

  The third cylinder 5 includes a rotating cylinder 10 that is an outer cylinder and a rectilinear cylinder 11 that is rotatably fitted in the rotating cylinder 10. The rotating cylinder 10 and the rectilinear cylinder 11 are fitted to each other at the subject side end in the optical axis direction. For this reason, the rotary cylinder 10 and the rectilinear cylinder 11 advance and retract integrally in the optical axis direction.

  A plurality of gear teeth 13 are formed on the outer peripheral surface of the rear end portion of the rotating cylinder 10. The gear teeth 13 are formed by cutting grooves in the optical axis direction at predetermined intervals in a helicoid mountain of a male helicoid. Thus, the gear teeth 13 and the male helicoid are provided side by side on the outer peripheral surface of the rotating cylinder 10.

  The housing cylinder 30 of the main body 6 is formed with a window that communicates the inside and the outside thereof, and a columnar gear 31 is disposed there. The gear 31 meshes with the gear teeth 13 formed on the rotary cylinder 10 of the third cylinder 5. A retracting motor 34 for rotating the gear 31 is attached to the housing cylinder 30.

  Further, three key grooves 33 are formed on the inner peripheral surface of the housing cylinder 30 at equal intervals in the circumferential direction. These key grooves 33 are formed linearly along the optical axis, and the guide protrusions 15 of the straight cylinder 11 of the third cylinder 5 are engaged with each other.

  The rotating cylinder 10 is rotated by a motor 34, and includes a male helicoid (also used as the gear teeth 13) formed on the outer peripheral surface of the rotating cylinder 10 and a female helicoid 35 formed on the inner peripheral surface of the housing cylinder 30. Advances in the direction of the optical axis by a helicoid mechanism. When the rotary cylinder 10 advances, the rectilinear cylinder 11 also advances together with the rotary cylinder 10 in the optical axis direction. In this way, the third cylinder 5 is extended and retracted with respect to the housing cylinder 30 of the main body 6.

  The shutter unit 700 including the shutter 701 and the third group unit 300 including the third lens group 301 are housed in the third cylinder 5 in this order from the front side. The third group unit 300 engages with a key groove (not shown) formed along the optical axis direction formed on the inner peripheral surface of the rectilinear cylinder 11, and advances straight along the optical axis direction when extended and retracted. To be guided. The shutter unit 700 is assembled on the subject side in the optical axis direction of the third group unit 300, and moves forward and backward along the optical axis integrally with the third group unit 300.

  The shutter unit 700 has a holder 702 that holds the shutter 701. The shutter 701 is provided in an opening formed in the center of the holder 702. The holder 702 is provided with a cam pin 703.

  The third group unit 300 including the third lens group 301 includes a holder 302 that holds the third lens group 301.

  The second cylinder includes an outer cylinder 40 and a cam cylinder 42 that is rotatably fitted to the inner peripheral surface of the outer cylinder 40. The outer cylinder 40 and the cam cylinder 42 are fitted to each other at the rear end on the imaging surface side in the optical axis direction. The outer cylinder 40 and the cam cylinder 42 are relatively rotatable and move integrally in the optical axis direction. The outer cylinder 40 has three pins (not shown) on the outer peripheral surface, and these pins are engaged with key grooves (not shown) in the optical axis direction provided on the inner peripheral surface of the rectilinear cylinder 11. Three cam pins 45 are provided at the rear end portion of the cam cylinder 42 at equal intervals in the circumferential direction.

  The cam pin 45 of the cam barrel 42 is engaged with a key groove (not shown) in the optical axis direction formed on the inner peripheral surface of the rotary barrel 10 through the cam groove 21 of the rectilinear barrel 11. Accordingly, the cam cylinder 42 rotates integrally with the rotating cylinder 10 and advances and retracts in the optical axis direction with respect to the rotating cylinder 10.

  A cam groove 47 is provided on the inner periphery of the cam cylinder 42, and a cam pin 703 engages with the cam groove 47 to guide the third group unit 300 and the shutter unit 700 so as to advance straight in the optical axis direction. . .

  The second group unit 200 including the second lens group 201 has a holder 202 that holds the second lens group 201. The second lens group 201 is disposed in an opening formed at the center of the disk-shaped portion of the holder 202. A cam pin 212 is provided on the outer periphery of the holder 202. The second group unit 200 has a key fitting portion that engages with the third group unit 300, and is guided so as to move straight along the optical axis direction without rotating when being extended and retracted.

  The second group unit 200 engages the cam pin 212 with the cam groove 46 of the cam cylinder 42 of the second cylinder 4. When the cam cylinder 42 rotates as the second cylinder 4 is extended and retracted, the second group unit 200 moves back and forth along the optical axis in the second cylinder 4.

The first cylinder 3 includes a first group unit 100 including a first lens group and an outer cylinder 120.
The first group unit 100 including the first lens group 101 includes a cylindrical holder 102 that holds the first lens group 101. The first lens group 101 is disposed in an opening formed in the center of the holder 102.

  The first cylinder 3 is fitted to the second cylinder 4 by a key fitting portion (not shown), and is guided so as to go straight along the optical axis direction without rotating when being fed and retracted. . A cam groove (not shown) is formed on the inner surface of the first cylinder 3. A cam pin 43 is engaged with the cam groove, and the first cylinder 3 advances and retreats in the optical axis direction without rotating as the cam cylinder 42 rotates.

  An annular cam plate 50 is provided at the rear end of the third cylinder 5. At the time of feeding and feeding, the cam plate 50 moves forward and backward together with the third cylinder. Further, gear teeth 51 are formed on the outer periphery of the cam plate 50. In the cam plate 50, gear teeth 51 are engaged with a gear 31 provided in the housing cylinder 30, and the cam plate 50 rotates in the XY plane by the rotation drive of the gear 31.

  The cam plate 50 includes a first engagement portion 52 and a second engagement portion 53 that protrude toward the inner peripheral side. The cam plate 50 rotates, and the first engaging portion 52 and the second engaging portion 53 are engaged with the third group unit 300, whereby the third lens group is retracted and the photographing position is set. It is an engagement member moved between. The shape of the cam plate 50 is not limited to this. The shape of the cam plate 50 is appropriately set within a range in which the cam plate 50 can be moved between a position where the third lens unit 301 is retracted by engaging with the third group unit 300 and a position where photographing is performed. Can be changed.

  Next, the configuration of the third group unit including the third lens group will be described.

  FIG. 8 is an external perspective view showing the configuration of the third group unit including the third lens group. FIG. 9 is an external perspective view seen from the opposite side of the arrow Z direction in FIG. FIG. 10 is an exploded perspective view showing the third group unit.

  The third group unit 300 includes a plate-shaped vibration isolation member 312 that directly holds the third lens group 301, and a plate-shaped base member 314 that supports the vibration isolation member 312 via four springs 313. . The anti-vibration member 312 is integrally connected to the base member 314 so as to be relatively displaceable by expansion and contraction of a spring. The anti-vibration member 312 and the base member 314 constitute a lens holder that holds the third lens group 301. To do.

  The anti-vibration member 312 has an opening into which the third lens group 301 is fitted in the center, and a pair of magnets 316 and a pair of coils 317 are assembled around the opening.

  An opening having a diameter slightly larger than the opening of the vibration isolation member 312 is formed at the center of the base member 314, and the front side portion of the third lens group 301 held by the vibration isolation member 312 extends from the opening of the base member 314. , Exposed to the holder 302 side.

  A pair of magnets 315 are assembled to the base member 314. Each of the pair of magnets 315 is disposed so as to face the pair of coils 317 assembled to the vibration isolation member 312 in the Z direction.

  Although not shown, the base member 314 is provided with two openings 319, and Hall elements 311 are assembled to the openings 319, respectively. Each of the two Hall elements 311 is disposed so as to face the pair of magnets 316 of the vibration isolation member 312 in the Z direction.

  The base member 314 is provided with two shield plates 318 for blocking magnetic flux leaking from the pair of magnets 315 on the surface opposite to the vibration isolating member 312.

  In addition, a flexible substrate 310 for supplying a current to the pair of coils 317 is fixed to the vibration isolation member 312 and the base member 314.

  The third group unit 300 generates a magnetic field between the coil 317 and the magnet 315 by supplying a current to the coil 317 through the flexible substrate 310, and the vibration generating member 312 is moved to the optical axis by the force generated by the magnetic field. On the other hand, it is moved in a desired direction in a plane perpendicular to the plane, that is, in a plane parallel to the XY plane. The hall element 311 detects the displacement of the magnet 316 in the XY plane. As described above, the third group unit 300 moves the position of the third lens group 301 held by the vibration isolation member 312 on a plane parallel to the XY plane, thereby correcting image blur during shooting. It has a mechanism that can do this.

  The third group unit 300 includes two guide shafts 320 in the holder 302. The two guide shafts 320 both have an axis along the Y direction and are arranged in parallel to each other. Each of the two guide shafts 320 is inserted into the base member 314 and fixed to the holder 302. Thus, the base member 314 is supported by the holder 302 so as to be slidable in the Y direction and the opposite direction by the guide shaft 320.

  Further, the third group unit 300 includes a toggle spring 330 disposed between the holder 302 and the base member 314. The toggle spring 330 is an ohm (ohm) shaped ohm spring. The shape of the toggle spring is not particularly limited.

  As shown in FIGS. 9 and 10, the toggle spring 330 has one end 331 locked to the locking portion 321 of the base member 314 and the other end 332 locked to the locking portion 322 of the holder 302.

  In the XY plane, the position of the locking portion 322 of the holder 302 does not change, but the position of the locking portion 321 of the base member changes according to the position of the base member. The toggle spring 330 switches the direction of the urging force of the toggle spring 330 by changing the relative positional relationship between the one end 331 and the other end 332 in the XY plane. Specifically, the toggle spring 330 is applied with a biasing force in a direction away from the other end 332 side to the one end 331 side in the XY plane, and the position of the one end 331 is changed with respect to the other end 332. The biasing force in the direction away from the other end 332 side is applied to the displaced one end 331 side.

  Next, a mechanism for sliding the base member 314 and the vibration isolation member 312 will be described.

FIG. 11 is an external perspective view showing a mechanism for sliding the third lens group.
The base member 314 includes a first engagement protrusion 342 that engages with the first engagement part 52 of the cam plate 50 and a second engagement protrusion 343 that engages with the second engagement part 53. Is formed.

  A concave portion 350 is formed in the holder 302. The recessed portion 350 accommodates the front end portion of the retracted third lens group 301.

  When the lens barrel is extended from the retracted state, the cam plate 50 is rotated so that the first engagement portion 52 is engaged with the first engagement protrusion 342 of the base member 314, and the base member is moved. Slide 314 to the opposite side in the Y direction. When the rotation of the cam plate 50 is started, the base member 314 is urged toward the Y direction by the toggle spring 330. The direction where the biasing force of the toggle spring 330 is applied is reversed at a position where the base member 314 has advanced to the opposite side in the Y direction to some extent, and the base member 314 is biased to the opposite side in the Y direction.

  When changing the lens barrel 2 from the extended state to the retracted state, the cam plate 50 is rotated to engage the second engaging portion 53 with the second engaging protrusion 343 of the base member 314, and The member 314 is slid in the Y direction. When the rotation of the cam plate 50 is started, the base member 314 is biased to the opposite side in the Y direction by the toggle spring 330. Then, with the position where the base member 314 has advanced to some extent in the Y direction as a boundary, the direction in which the biasing force of the toggle spring 330 is applied is reversed, and the base member 314 is biased in the Y direction.

  Next, an operation for sliding the base member 314 will be described.

  FIG. 12 is a diagram for explaining the sliding operation of the third lens group when the lens barrel is extended from the retracted position to the wide end.

  As shown in FIG. 12A, when the lens barrel is retracted, the base member 314 is held at a position retracted from the position on the optical axis by the urging force of the toggle spring 330.

  As shown in FIG. 12B, when the lens barrel is extended to the wide end position, the cam plate 50 rotates in the direction of the arrow in the drawing, and the first engaging portion 52 is the first member of the base member 314. Engage with the engaging protrusion 342. A force that slides in the opposite direction in the Y direction against the biasing force of the toggle spring 330 is applied to the base member 314 by the first engagement protrusion 342. Then, the base member 314 advances to the opposite side in the Y direction, the direction of the urging force of the toggle spring 330 is reversed at a predetermined position, and the base member 314 is urged to the opposite side in the Y direction. Then, as shown in FIG. 12C, the base member 314 slides to the opposite side in the Y direction by the urging force of the toggle spring 330, and the optical axis of the third lens group 301 is different from the optical axis of the other optical system. A matching position (photographing position) is reached.

  As shown in FIG. 12C, the base member 314 is held by the biasing force in the direction opposite to the Y direction by the toggle spring 330 in a state where the third lens group 301 is in the photographing position.

  FIG. 13 is a diagram illustrating the sliding operation of the third lens group when the lens barrel is retracted from the wide end to the retracted position.

  As shown in FIG. 13A, when the lens barrel is extended, the base member 314 is photographed by the biasing force of the toggle spring 330 so that the optical axis of the third lens group 301 coincides with the optical axis of the other optical system. Held in position.

  As shown in FIG. 13B, when the lens barrel is retracted, the cam plate 50 rotates in the direction of the arrow in the figure, and the second engagement portion 53 is the second engagement protrusion of the base member 314. 343 is engaged. A force that slides in the Y direction against the biasing force of the toggle spring 330 is applied to the base member 314 by the second engagement protrusion 343. Then, the base member 314 advances in the Y direction, the direction of the urging force of the toggle spring 330 is reversed at a predetermined position, and the base member 314 is urged in the Y direction. Then, as shown in FIG. 13C, the base member 314 slides in the Y direction by the biasing force of the toggle spring 330, and the optical axis of the third lens group 301 is retracted from the optical axis of the other optical system. To reach.

  As shown in FIG. 13C, the base member 314 is held by the biasing force in the Y direction of the toggle spring 330 in a state where the third lens group 301 is in the retracted position.

  According to the lens barrel and the imaging device described above, the biasing force of the toggle spring can hold the third lens group at both the retracted position and the photographing position, and the lens group can be rattled. Can be prevented. In addition, it is not necessary to provide separate holding mechanisms at the respective positions, and the complexity and size of the structure can be avoided.

  In addition, the lens barrel and the imaging device have a configuration in which a blur correction mechanism is provided in the third group unit that holds the third lens group. However, when the lens barrel is retracted, the entire blur correction mechanism can be retracted. For this reason, it is possible to avoid the reduction of the size of the lens barrel during the retraction by the blur correction mechanism.

This specification discloses the following matters.
(1) A lens barrel that includes a plurality of cylinders that can be extended and retracted in a nested manner and that retracts and retracts the plurality of cylinders that are extended.
An optical system including a plurality of lens groups housed in the lens barrel;
A lens group disposed on the optical axis in a state in which the plurality of cylindrical bodies are extended, the lens holding unit holding the lens group retracted to a position deviated from the optical axis when the lens barrel is retracted; ,
A toggle mechanism that holds the position of the lens holder by a biasing force of a spring in a state where the lens barrel is retracted and a state where the lens barrel is extended;
The toggle mechanism is a lens barrel in which the direction of the biasing force of the spring is switched at a predetermined position of the moving lens holder.
(2) The lens barrel according to (1),
A lens barrel provided with an engagement member that is displaced as the lens barrel is retracted and extended, engages with the lens holder, and moves the lens holder from a position on the optical axis to a retracted position.
(3) The lens barrel according to (1) or (2),
The spring is a lens barrel that is a toggle spring that has one end locked to a holder that slidably holds the lens holding body, and the other end locked to the lens group that is retracted to a position off the optical axis. .
(4) The lens barrel according to any one of (1) to (3),
A lens barrel in which the lens holder includes a base member and a vibration isolating member supported by the base member, and a vibration correction mechanism that moves the vibration isolating member in a plane perpendicular to the optical axis.
(5) The lens barrel according to any one of (1) to (4);
An imaging device disposed at an imaging point of the optical system of the lens barrel.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Lens barrel 3 1st cylinder 4 2nd cylinder 5 3rd cylinder 6 Main body 50 Cam plate (engaging member)
52 First engagement portion 53 Second engagement portion 100 First group unit 101 First lens group 200 Second group unit 201 Second lens group 300 Third group unit 301 Third lens group 312 Base member 314 Anti-vibration member 320 Guide Shaft 330 Toggle spring 342 First engagement protrusion 343 Second engagement protrusion 400 Fourth group unit 401 Fourth lens group 700 Shutter unit

Claims (4)

A lens barrel that includes a plurality of cylinders that can be extended and retracted in a nested manner, and retracts by retracting the plurality of cylinders that have been extended.
An optical system including a plurality of lens groups housed in the lens barrel;
A lens group disposed on the optical axis in a state in which the plurality of cylindrical bodies are extended, the lens holding unit holding the lens group retracted to a position deviated from the optical axis when the lens barrel is retracted; ,
A toggle mechanism for holding the position of the lens holder by a biasing force of a spring in a state where the lens barrel is retracted and a state where the lens barrel is extended;
An engagement member that is displaced as the lens barrel is retracted and extended, engages with the lens holder, and moves the lens holder between a position on the optical axis and a position off the optical axis. And comprising
The toggle mechanism switches the direction of the biasing force of the spring at a predetermined position of the moving lens holder,
One end of the spring is locked to a holder that slidably holds the lens holder, and the other end of the spring is locked to the lens group that is retracted to a position off the optical axis .
The lens holding body is moved by the engagement member until the predetermined position where the direction of the biasing force of the spring is switched, and is moved by the biasing force of the spring after the predetermined position is exceeded . The lens barrel according to claim 1,
The holder is a lens barrel housed in the cylindrical body. The lens barrel according to claim 1 or 2 ,
A lens barrel in which the lens holder includes a base member and a vibration isolating member supported by the base member, and a vibration correction mechanism that moves the vibration isolating member in a plane perpendicular to the optical axis. The lens barrel according to any one of claims 1 to 3 ,
An imaging device disposed at an imaging point of the optical system of the lens barrel.

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