JP2007171731A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel to which a straight advance guide member can be attached without requiring an attachment member. <P>SOLUTION: A straight advance guide member 25 has an annular portion 25a. In the straight advance guide member 25, a cut 25a1 which can elastically deform the annular portion on a surface orthogonal to an optical axis is formed in the annular portion 25a. A circumferential groove 22e is formed on the inner circumferential surface of a rotating frame 22 and the annular portion 25a is fitted into the circumferential groove 22e by using elastic deformation, so as to allow the relative rotation of the rotating frame 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens barrel in which a plurality of frame members that hold a photographing lens group and the like are configured to be relatively movable in an optical axis direction.

  The lens barrel is composed of a plurality of frame members (lens frames). As the frame member, a fixed frame fixed in the camera book and the like, and fixed so as to be relatively rotatable with respect to the fixed frame and relatively movable in the optical axis direction. There are a rotating frame housed in the frame and a plurality of lens frames housed in the rotating frame so that relative rotation with respect to the rotating frame is restricted and movable in the optical axis direction.

  The relative rotation of the lens frame with respect to the rotation frame is restricted (restricted) by a rectilinear guide member called a float key, a key ring, a rectilinear ring, or the like. That is, the rectilinear guide member has a rectilinear key (key) extending in the optical axis direction, and the rectilinear key is engaged with the rectilinear groove on the peripheral surface of the lens frame. The rectilinear guide member is attached to the rotating frame so that the relative rotation with respect to the fixed frame is restricted, and the rotating frame is allowed to move in the optical axis direction while allowing the relative rotation of the rotating frame.

Conventionally, attachment (incorporation) of the rectilinear guide member to the rotary frame is performed using an attachment member. For example, in Japanese Patent Application Laid-Open No. 5-188273, a key receiving member is screwed to a peripheral surface of a rear end portion (an end portion on the imaging element side) of a rotary frame, and the key receiving member is bent inward in the radial direction. A configuration is described in which the straight guide member is held and attached to the rear end surface of the rotary frame by the bent piece.
Japanese Patent Application Laid-Open No. 2000-066081 describes a configuration in which a straight guide member is screwed to a disk-shaped coupling member attached to a rear end portion of a rotating frame.
JP-A-5-188273 JP 2000-066081 A

  However, in the known configuration, an attachment member is required to attach the rectilinear guide member to the rotating frame. This increases the cost and complicates the assembly process, making it difficult to perform rapid assembly.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel in which a straight guide member can be attached without requiring an attachment member.

  According to the present invention, the lens barrel has a first frame having a rectilinear groove provided along the optical axis direction; and has a circumferential groove, while rotating relative to the first frame. A second frame that advances and retreats in the direction of the optical axis; a third frame that advances and retreats in the direction of the optical axis with respect to the second frame; and is elastically deformable in a plane perpendicular to the optical axis. An annular portion that fits into the circumferential groove and is rotatable relative to the second frame and moves in the optical axis direction together with the second frame, and extends from the annular portion to the rectilinear groove And an anti-rotation piece that prevents the annular portion from rotating relative to the first frame while allowing relative movement in the optical axis direction in the linear groove, and the optical portion from the annular portion. The third frame extends in the direction and engages with the third frame, and is movable relative to the third frame in the optical axis direction. It is characterized by comprising; a straight guide member and a key for restricting the rotation of the frame.

  Further, according to the lens barrel of the present invention, the relative rotation of the lens frame housed in the rotary frame that is rotatable with respect to the fixed frame and movable in the optical axis direction is restricted relative to the fixed frame, and in the optical axis direction. A rectilinear guide member that guides the movement is formed to have an annular portion that can be elastically deformed in a plane orthogonal to the optical axis; and allows the relative rotation of the rotating frame to fit with the annular portion of the rectilinear guide member. The circumferential grooves to be joined are formed on the peripheral surface of the rotating frame.

  According to the present invention, the rectilinear guide member is attached using elastic deformation, and the attachment member is not necessary.

  In the present invention, the rectilinear guide member has a partially cutout elastically deformable annular portion, and the notched annular portion is fitted into a circumferential groove on the inner peripheral surface of the rotary frame, Relative rotation is allowed.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view along the optical axis of a lens barrel according to an embodiment of the present invention housed in a digital camera, and FIG. 2 is an exploded perspective view of components of the lens barrel shown in FIG.

  As shown in FIG. 1, the camera body 10 is provided with a lens barrel 20, and an imaging device 10 a that is a CCD that captures an imaging light beam obtained by a series of lens groups in the lens barrel is supported in the camera body. It arrange | positions through the electric board | substrate 10c on the member 10b.

  As shown in FIGS. 1 and 2, the lens barrel 20 includes a fixed frame 21 fixed to a support member 10b in the camera book, a fixed frame that is rotatable with respect to the fixed frame and movable in the direction of the optical axis O. A rotation frame 22 housed in the first group movement frame, and a first group movement frame 23 and a second group lens frame 24 housed in the rotation frame so as to be linearly movable in the optical axis direction and non-rotatable. The first group lens frame 231 is housed in the.

  The fixed frame 21 has a cylindrical body having an outer flange 21a at an end on the image sensor side (hereinafter referred to as “rear end”) and an inner flange 21b at an end on the subject side (hereinafter referred to as “front end”). And is fixed to a support member 10b in the camera body via an outer flange. A female helicoid screw 21 c is formed on the inner peripheral surface of the fixed frame 21. Furthermore, a long drive gear hole 21 d and a rectilinear groove 21 e parallel to the optical axis O are formed on the inner peripheral surface of the fixed frame 21. And the bearing 21f for receiving the below-mentioned drive gear is provided in the optical axis direction both ends of the drive gear hole 21d.

  A zoom drive motor (zoom motor) 211 is provided adjacent to the fixed frame 21 and outside the fixed frame. A drive gear 212 is rotatably supported by the bearing 21f in the drive gear hole 21d on the inner peripheral surface of the fixed frame.

FIG. 3 shows a rear view of the lens barrel seen from the direction of arrow B in FIG. As shown in FIGS. 2 and 3, the rotary frame 22 has a cylindrical body having a spur gear 22a in a predetermined angular range in the circumferential direction at the rear end, for example, a range of 270 degrees, and an inner flange 22b in the front end. The spur gear 22a is formed with a male helicoid screw 22c.
Further, spiral first and second cam grooves 22d1 and 22d2 are arranged in parallel with each other on the inner peripheral surface of the rotary frame 22, and these cam grooves are formed on the rear end surface of the rotary frame. Branching in the middle of the introduction groove 22d3 and extending in parallel with each other. Three common introduction grooves 22d3 are formed apart from each other at intervals of 120 degrees in the circumferential direction.

A first group moving frame 23 and a second group lens frame 24 are housed in the rotary frame 22, and the first group moving frame is a cylindrical body having an inner flange 23 a at the front end portion, and the first group moving frame is inside the first group moving frame 23. A lens frame 231 is held. The first group lens frame 231 includes a first group lens holding frame 231d that holds the first group lens 231a. The first group lens holding frame 231d is supported so as to be movable relative to the first group lens frame 231 in the optical axis direction for focusing. On the other hand, the second group lens frame 24 holds the second group lens 24a therein.
A rectilinear key groove 231 b parallel to the optical axis O is formed in the lower part of the first group lens frame 231. Further, a rectilinear key groove 24 b parallel to the optical axis O is formed below the second group lens frame 24.

A focus drive motor (focus motor) 231c is provided on the rear end face of the first group lens frame 231. The upper part of the second group lens frame 24 is cut out so as to secure a space for arranging the focus motor 231c.
Three cam followers 23b are formed on the outer peripheral surface of the first group moving frame 23 so as to be separated from each other at intervals of 120 degrees in the circumferential direction. In addition, three cam followers 24c are also formed on the outer peripheral surface of the second group lens frame 24 so as to be separated from each other at intervals of 120 degrees in the circumferential direction.

  As described above, the rotating frame 22 is housed in the fixed frame 21, and the first group moving frame 23 and the second group lens frame 24 are housed and arranged in the rotating frame from the end (rear end) on the image sensor side, respectively. Then, the rectilinear ring 25 is attached to the rear end portion of the rotary frame 22. Then, the dropout of the lens frames 231 and 24 from the rotary frame after the first group moving frame 23 and the second lens frame 24 holding the first group lens frame 231 are assembled in the rotary frame 22 is a rectilinear ring. 25.

  4 shows the rectilinear ring 25, (A) is a plan view, and (B) and (C) are cross-sectional views taken along lines BB and CC of (A). As shown in FIG. 4 in addition to FIG. 2, the rectilinear ring 25 is imaged from the annular portion 25a, the rectilinear key 25b extending from the annular portion to the subject side in parallel to the optical axis, and from the annular portion opposite to the rectilinear key. A tip of a short plate portion extending toward the element side is formed with a rotation stopper 25c extending further outward in the radial direction. For example, the annular portion 25a is an annular shape, and the rectilinear key 25b and the rotation stopper 25c are formed at the lower portion of the annular portion. Further, a part of the annular portion 25a, for example, an upper portion of the annular portion is cut away. The cutout is, for example, a cut (cutout) 25a1 inclined with respect to a straight line (radiation) R in the radial direction. Since the lens barrel such as the rotary frame 22 has a cylindrical shape, the annular portion 25a is usually an annular shape, but is not limited to an annular shape, and may be a non-annular shape such as a polygon.

  Since the rectilinear ring 25 has an annular portion 25a, and the notch 25a1 is provided in the annular portion, the rectilinear ring 25 can be deformed in a plane orthogonal to the optical axis O, such as an E ring or a C ring, The envelope circle enveloping the ring outer diameter of the ring is smaller than the envelope circle in the natural state before elastic deformation, that is, the outer diameter of the ring, at the time of elastic deformation. A circumferential groove, for example, a circumferential groove 22e (circumferential groove) (see FIGS. 1 and 3) is formed on the inner peripheral surface of the end of the rotating frame 22 on the image sensor side, and is subjected to elastic deformation. Thus, the rectilinear ring 25 is fitted into the circumferential groove.

In FIG. 3, the annular portion 25a of the rectilinear ring has a non-deformation outer diameter Dout that is slightly smaller than the diameter E of the groove bottom surface of the circumferential groove 22e, and the diameter of the inner peripheral surface of the rotating frame (the inner diameter of the rotating frame). ) It is formed larger than F. Further, the inner diameter Din when the annular portion 25a is not deformed is formed to be considerably smaller than the diameter (inner diameter of the rotating frame) F of the inner peripheral surface of the rotating frame. Furthermore, the thickness of the annular portion 25a is slightly smaller than the length (width) of the circumferential groove 22e in the optical axis direction.
Therefore, if the annular portion 25a with the notch 25a1 is elastically deformed to be smaller than the inner diameter F of the rotating frame, and the annular portion is returned to a natural state at a position in the optical axis direction where the annular portion is aligned with the circumferential groove 22e, the annular portion Is fitted in the circumferential groove so as not to be detached. Since the outer diameter Dout of the annular portion 25a in a natural state (when not deformed) is smaller than the diameter E of the groove bottom surface of the circumferential groove 22e, the outer peripheral surface of the annular portion is not pressed against the groove bottom surface of the circumferential groove 22e. A gap is left between the bottom of the groove. Further, since the thickness of the annular portion 25a is smaller than the width of the circumferential groove 22e, a gap is left between the annular portion and the circumferential groove in the optical axis direction. As described above, since a gap is left in the radial direction and the optical axis direction, the rectilinear ring 25 is fitted into the circumferential groove 22e of the rotating frame while allowing the relative rotation of the rotating frame 22.

The rectilinear ring 25 is fitted into the circumferential groove 22e of the rotating frame using its elastic deformation, and can be assembled (attached) to the rotating frame 22 without requiring an attaching member. Further, since only elastic deformation is required, the assembling process is not complicated, the assembling can be easily performed, and the lens barrel 20 can be assembled quickly.
Since it is sufficient to provide the linear key 25b, the rotation stopper 25c, and the notch 25a1 in the annular portion 25a corresponding to the main body of the linear ring 25, the configuration of the linear ring is not complicated, and the linear ring can be easily formed. .
Here, an engagement hole 25a2 may be provided in the end portion 25a11 of the annular portion 25a facing the notch 25a1 (see FIG. 3). If such an engagement hole 25a2 is provided, for example, the annular portion 25a is elastically deformed by engaging the engagement pin with the engagement pin at the free end of the scissor-like (substantially X-shaped) processing jig. It can be easily fitted in the circumferential groove 22e of the rotating frame, and the rectilinear ring 25 can be quickly incorporated into the rotating frame 22.

Here, the notch 25a1 of the rectilinear ring may be formed in parallel with the radial line R. However, as described below, it is more preferable that the notch is an oblique notch that inclines and intersects with the radial line R.
FIG. 5 shows a plan view of the rectilinear ring. (A) is a notched rectilinear ring formed in parallel with the radial line R, and (B) and (C) are intersected with the radial line R ( Each of the straight rings with (slant) notches is shown. Assuming that the width (gap) of the notch 25a1 is d and the cross section XX in FIG. 5A is a fixed end, the two end portions 25a11 facing the parallel notch can be displaced by d / 2. Become.
On the other hand, if the width of the oblique notch 25a1 in FIG. 5B is the same value (= d), the circumferential width d ₁ is d ₁ = d / cos θ, and 0 <θ <. in 90, from d ₁ is greater than d, assuming a fixed end sectional X-X, displaceable length of the two ends 25a11 (= d _1/2) is greater than d / 2. That is, if the notch 25a1 is formed obliquely, if the notch width is the same, a larger displacement than in the case of the parallel notch is obtained, and the rectilinear ring 25 is elastically deformed under a large displacement. In addition, it is possible to easily incorporate the rectilinear ring into the rotary frame 22.

Further, as shown in FIG. 5C, the width d _{2 of the} notch 25a1 where the displaceable length of the end portion 25a11 is d / ₂ is d ₂ = d cos θ, and when 0 <θ <90, d ₂ Is smaller than d, and if the notch 25a1 is formed obliquely, the same displacement (= d / 2) as that of the parallel notch can be obtained with a small notch width (d ₂ ). That is, the width of the notch 25a1 necessary for obtaining the same displacement of the end portion 25a11 is smaller if the notch is formed obliquely than when the notch is parallel. If the width of the notch 25a1 is small, the displacement with respect to the external force after assembly is small, and therefore the displacement of the rectilinear ring 25 is small with respect to the rotation of the rotary frame 22, and a stable movement is ensured.

  As described above, if the notch 25a1 of the rectilinear ring is formed obliquely, a large elastic deformation can be obtained at the time of assembling, and the rectilinear ring 25 can be easily incorporated into the rotary frame 22. Further, if the above-described embodiment different from this is adopted, the straight ring 25 is hardly deformed even after being assembled, and a stable movement is ensured.

The cutout 25a1 formed in the annular portion 25a of the rectilinear ring is sufficient if it can ensure elastic deformation of the annular portion, and need not be a cut that completely divides the annular portion. FIG. 6 is a perspective view of a rectilinear ring 25 according to another embodiment as viewed from below. The notch 25a1 is inclined with respect to the radial straight line at the annular portion 25a, and continuously from the annular portion to the length of about 1/2 of the entire length in the longitudinal direction at the center in the width direction of the rectilinear key 25b. It has a long and long groove shape.
Even in the long groove-shaped notch 25a1 provided from the annular portion to the straight key 25b without completely dividing the annular portion 25a, desired elastic deformation is ensured in the annular portion. In this configuration, the annular portion 25a is elastically deformed by applying a pressing force in the circumferential direction (in the direction of the arrow) to the base of the rectilinear key 25b adjacent to the annular portion 25a, so that the annular portion 25a is circumferentially grooved 22e of the rotating frame. (See FIG. 1), and the straight ring 25 can be quickly assembled into the rotary cylinder 22 without a tool.

  The cutout 25a1 formed in the annular portion 25a of the rectilinear ring suffices as long as it can ensure elastic deformation. The embodiment shown in FIG. 4 and FIG. 5 is divided, the annular portion shown in FIG. 6, and the rectilinear key 25b. It is not limited to the aspect of the long groove shape formed continuously. FIG. 7 shows a plan view of a rectilinear ring 25 according to another embodiment. For example, four notches 25a1 spaced apart from each other by 90 degrees in the circumferential direction are formed on the inner peripheral surface of the annular portion 25a, and the rectilinear ring 25 may be elastically deformable. Here, if the two parallel cutouts 25a12 are formed on the outer peripheral surface of the annular portion 25a adjacent to the cutout 25a1, the rectilinear ring 25 can be quickly fitted into the circumferential groove 22e of the rotating frame.

For example, the linearly moving ring 25 is incorporated into the rotary frame 22 in the following procedure.
First, the annular portion 25a of the rectilinear ring is bent into an elliptical shape in the direction of the arrow and inserted into the inner diameter of the rotating frame 22. At this time, since the dimension of the elliptical long axis direction (Y direction) of the deformed annular portion 25a is larger than the inner diameter of the rotating frame 22, the annular portion is inserted into the inner diameter of the rotating frame 22 while being inclined and deformed. The outer peripheral surface of the annular portion in the minor axis direction (X direction) is inserted while being in contact with the inner diameter of the rotating frame 22. When the outer peripheral surface in the minor axis direction of the annular portion 25a reaches the circumferential groove 22e of the circumferential groove, that is, when the notch 25a12 of the outer peripheral surface of the annular portion reaches the circumferential groove, the inclination The annular portion 25a is rotated so as to be pressed toward a plane perpendicular to the optical axis. Then, the annular portion 25a is fitted into the circumferential groove 22e of the rotating frame while slightly deforming the rotating frame 22 following the annular portion 25a deformed into an elliptical shape. Then, at the moment of fitting, the deformation of the rotating frame 22 and the annular portion 25a is eliminated, and the annular portion is fitted into the circumferential groove 22e of the rotating frame in a natural state without deformation, and the rectilinear ring 25 rotates. Built into the frame.

  In the rectilinear ring 25 shown in FIG. 7, since the notch 25a1 formed in the rectilinear ring of another embodiment is not in the annular portion 25a, the outer peripheral surface of the first group moving frame 23 and the inner peripheral surface of the rotary frame 22 This is advantageous in that it can block unnecessary external light entering from the outside into the gap.

  In each of the embodiments, the inner diameter of the annular portion 25a of the rectilinear ring is illustrated as a simple circular opening. However, the present invention is not limited to this. For example, a rectangular opening that is long in the horizontal direction may be used. If the opening has a shape, it becomes a substitute for the flare stop.

  The movement of the lens barrel 20 will be described. The rotating frame 22 has the helicoid screw 22c meshed with the corresponding helicoid screw 21c of the fixed frame 21, and the spur gear 22a meshed with the drive gear 212 to fix the fixed frame 21. It is stored inside. Further, the pinion gear 211a of the zoom motor 211 is engaged with the drive gear 212 in the drive gear hole on the inner peripheral surface of the fixed frame, and the drive gear is engaged with the spur gear 22a at the end of the rotating frame in the fixed frame. Therefore, when the zoom motor 211 is driven, the driving force is transmitted to the rotating frame 22 through the pinion gear 211a, the driving gear 212, and the spur gear 22a, and the rotating frame is guided by the helicoid screw 21c and rotates in the fixed frame. While moving along the optical axis O.

The first group moving frame 23 is housed in the rotating frame 22, and the cam follower 23b of the first group moving frame is introduced from the common introduction groove 22d3 to the spiral first cam groove 22d1 on the inner peripheral surface of the rotating frame. Is engaged. The second group lens frame 24 is housed in the rotary frame 22, and the cam follower 24c of the second lens group is introduced from the common introduction groove 22d3 to the spiral second cam groove 22e2 on the inner peripheral surface of the rotation frame. Is engaged. Then, the rotation stop 25b of the rectilinear ring is engaged with the rectilinear groove 21e on the inner peripheral surface of the fixed frame, and the rectilinear key 25a of the rectilinear ring is aligned with the rectilinear key groove 231b of the first group lens frame in the first group moving frame 23, and The second group lens frame is engaged with the straight key groove 24b.
Therefore, when the rectilinear ring 25 is non-rotatable and rectilinear with respect to the fixed frame 21, and the rotating frame 22 is moved while rotating, the first group moving frame 23 and the second group lens frame 24 are moved straight on the rectilinear key. Guided by 25a, it goes straight to a predetermined zoom position.
Thereafter, when the focus motor 231c is driven, the driving force is transmitted to the first group lens holding frame 231d via a reduction gear train (not shown), and the first group lens holding frame moves straight to the focus position. Focusing is done.

As described above, according to the present invention, by forming the elastically deformable surface in a plane parallel to the optical axis, it is possible to quickly incorporate a rectilinear ring (straight guide member) without requiring any attachment member.
In addition, the circumferential groove 22e of the embodiment of the present invention does not necessarily have to be provided over the entire circumference, it is only necessary to allow the annular portion to rotate and to restrict movement in the optical axis direction, and some of the grooves are formed. What is necessary is just to be provided in several places in the lens frame circumferential direction. However, if it is provided over the entire circumference like the circumferential groove 22e of the embodiment of the present invention, unnecessary external light entering from between the lens frames can be prevented.

  In the present invention, the rotation of the lens frame (third frame) with respect to the rotating frame is controlled by the rectilinear ring member that is restricted in rotation by the fixed frame (first frame) and moves in the optical axis direction together with the rotating frame (second frame). It can be applied to a wide range of lens barrels whose relative rotation is restricted.

1 shows a longitudinal sectional view along an optical axis of a lens barrel according to an embodiment of the present invention housed in a digital camera. The disassembled perspective view of the structural member of the lens-barrel shown in FIG. 1 is shown. The rear view of the lens-barrel seen from the arrow B of FIG. 1 is shown. A straight traveling ring is shown, (A) is a plan view, and (B) and (C) are cross-sectional views taken along lines BB and CC in (A). The top view of a rectilinear ring is shown, (A) is a notch linear ring formed in parallel with the radial line R, (B) (C) is a notch which inclines and intersects with the radial line R at an angle. The attached straight ring is shown. The perspective view of the rectilinear ring which concerns on another Example is shown. The top view of the rectilinear ring which concerns on another Example is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Camera body 10a Image pick-up element 20 Lens barrel 21 Fixed frame (1st frame)
22 Rotating frame (second frame)
22e Circumferential groove 23 First group moving frame 231 First group lens frame (third frame)
231a First group lens 231d First group lens holding frame 24 Second group lens frame (third frame)
24a Second lens group 25 Straight advance ring 25a Annular portion 25a1 Notch 25b Straight advance key 25c Anti-rotation

Claims (6)

A first frame having a rectilinear groove provided along the optical axis direction;
A second frame having a circumferential groove and moving forward and backward in the optical axis direction while rotating relative to the first frame;
A third frame that advances and retreats in the optical axis direction with respect to the second frame;
It can be elastically deformed in a plane orthogonal to the optical axis, and can be fitted in the circumferential groove by the elastic deformation and rotated relative to the second frame, together with the second frame, in the optical axis direction. An annular portion that moves to the annular portion, engages with the rectilinear groove extending from the annular portion, and allows the relative movement in the optical axis direction within the rectilinear groove, while the annular portion rotates relative to the first frame. An anti-rotation piece that prevents the rotation, and extends from the annular portion in the optical axis direction, engages with the third frame, and is movable relative to the third frame in the optical axis direction. A rectilinear guide member having a key for restricting rotation of the three frames;
A lens barrel characterized by comprising: A rectilinear guide member that restricts relative rotation of the lens frame housed in a rotating frame that is rotatable with respect to the fixed frame and that is movable in the optical axis direction, and that guides movement in the optical axis direction, and an optical axis. Formed with an annular portion that is elastically deformable in an orthogonal plane;
A lens barrel characterized in that a circumferential groove for allowing relative rotation of the rotary frame and fitting with the annular portion of the rectilinear guide member is formed on the peripheral surface of the rotary frame. 3. The lens barrel according to claim 1, wherein a part of the annular portion is cut out and the elastic deformation is performed. 4. The lens according to claim 3, wherein the annular portion is formed in an annular shape and has a notch cut out in a direction inclined with respect to a straight line extending in the radial direction from the center of the annular ring. A lens barrel. 4. The lens barrel according to claim 3, wherein the lens barrel is continuously cut out to a part of the key in the longitudinal direction of the key across the annular portion. 4. The lens barrel according to claim 3, wherein a part of the annular portion is notched on the inner peripheral surface.

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