JP2018151507A - Barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel which is easy to assemble and can smoothly transmit a driving force to a movable lens. SOLUTION: A lens barrel is arranged with respect to a main body portion, a drive member rotatably provided around an optical axis, and a drive member in the optical axis direction at a distance from the optical axis. It consists of a movable member that can rotate around it. Further, the drive member has a first connecting member having one end fixed to the drive member in the optical axis direction and extending from one end toward the movable member, and the movable member comes into contact with the other end of the first connecting member. 1 Has a contact portion. Further, the movable member has a second connecting member having one end fixed to the movable member in the optical axis direction and extending from one end toward the driving member, and the driving member comes into contact with the other end of the second connecting member. It has two contact portions. [Selection diagram] Fig. 3

Description

  The present invention relates to a lens barrel.

  An imaging apparatus such as a digital camera is provided with a replaceable lens barrel that holds an optical system such as an imaging lens. A specific configuration of this type of lens barrel is described in Patent Document 1, for example.

  A lens barrel 1 described in Patent Document 1 includes a barrel main body 10, a movable lens 31 that is held so as to be movable in the optical axis direction with respect to the barrel main body 10, and a movable member 8 that is coupled to the movable lens 31. And a drive ring 4 rotatably provided on the lens barrel body 10 and a pair of connecting members 9 for connecting the movable member 8 to the drive ring 4. When the drive ring 4 is rotated manually or by a motor, the movable member 8 is rotated via the connection member 9. Due to the rotation of the movable member 8, the movable lens 31 moves in the optical axis direction. In the above description regarding the lens barrel 1 described in Patent Document 1, the names of the respective members are changed from the contents described in Patent Document 1 for convenience of description.

JP 2014-197240 A

  In the lens barrel 1 exemplified in Patent Document 1, each of the pair of connection members 9 has a shape in which one end is fixed to the movable member 8 and the other end protrudes toward the drive ring 4. Then, the other end of each connection member 9 is engaged with a groove of the protrusion 43 formed on the drive ring 4. Thereby, the connecting member 9 is fixed to the protrusion 43 in both the circumferential direction and the radial direction with respect to the optical axis direction. For this reason, when there is an axial deviation between the drive ring 4 and the movable member 8, or when the drive ring 4 or the movable member 8 is eccentric from the optical axis due to manufacturing errors or assembly errors, the drive ring 4 and the movable member 8 may be difficult to be connected by the connecting member 9, and the driving force may not be smoothly transmitted from the driving ring 4 to the movable member 8. In addition, when the rotation center axis of the movable member 8 is inclined with respect to the rotation center axis of the drive ring 4, when the drive ring 4 is rotated, a compression force or tension is applied to the connection member 9, and the connection member 9. In addition, there is a possibility that the engaging portion between the connecting member 9 and the drive ring 4, the fixing portion of the connecting member 9 to the movable member 8, and the like are damaged.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens barrel that is easy to assemble and can smoothly transmit a driving force to a movable lens. is there.

  A lens barrel according to an embodiment of the present invention is provided with a main body, a drive member provided to be rotatable around the optical axis with respect to the main body, and a drive member spaced apart in the optical axis direction. A movable member rotatable around the optical axis. The drive member has a first connection member having one end in the optical axis direction fixed to the drive member and extending from the one end toward the movable member, and the movable member is in contact with the other end of the first connection member. The movable member has a second connection member that is fixed to the movable member at one end in the optical axis direction and extends from the one end toward the drive member. It has the 2nd contact part which contacts the other end.

  According to an embodiment of the present invention, a lens barrel that can be easily assembled and can smoothly transmit a driving force to a movable lens is provided.

FIG. 1 is a cross-sectional view of a lens barrel according to an embodiment of the present invention. FIG. 2 is a perspective view of a lens barrel according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a lens barrel according to an embodiment of the present invention. FIG. 4 is a diagram showing a structure near the engaging portion between the movable member and the first connecting member according to an embodiment of the present invention, and a diagram showing a structure near the engaging portion between the drive ring and the second connecting member. is there. FIG. 5 is a diagram showing only the drive ring, the movable member, the first connection member, and the second connection member in the lens barrel according to the embodiment of the present invention. FIG. 6 is a diagram illustrating a connection method between the first connection member and the movable portion according to a modification of the embodiment of the present invention. FIG. 7 shows a connection method between the first connection member and the movable portion according to another modification of the embodiment of the present invention. FIG. 8 is a diagram illustrating a method of connecting the second connection member and the drive ring according to another modification of the embodiment of the present invention.

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

  FIG. 1 is a cross-sectional view of a lens barrel 1 according to an embodiment of the present invention. The lens barrel 1 according to the present embodiment is a lens barrel used in, for example, a photographing optical system of a digital single lens reflex camera that is a form of a photographing apparatus. The lens barrel 1 is not limited to a barrel for a digital single lens reflex camera, but a mirrorless single lens camera, a compact digital camera, a video camera, a camcorder, a desktop PC, a notebook PC, a tablet terminal, a PHS (Personal Handy phone System), It may be a lens barrel used in another photographing apparatus such as a smartphone, a feature phone, or a game machine, or a barrel used in a projection optical system such as a projector.

[Configuration of lens barrel 1]
The lens barrel 1 includes a main body 10, an annular drive ring 20 that can rotate around the optical axis AX, a cylindrical movable member 30 that can rotate around the optical axis AX, a rectilinear guide member 40, and a photographing lens L. I have. The photographic lens L includes a fixed lens L1 that is fixed to the main body 10 and a movable lens L2 that is movable with respect to the main body 10 in the optical axis direction. The photographing lens L may include a fixed lens and a movable lens other than the fixed lens L1 and the movable lens L2. Hereinafter, the direction in which the fixed lens L1 is provided in the photographing lens L is defined as the front, and the direction in which the movable lens L2 is provided is defined as the rear in parallel with the optical axis direction.

  A cylindrical exterior 100 is disposed in front of the lens barrel 1. An optical member 101 is attached in front of the exterior part 100. The optical member 101 is, for example, a cover glass for protecting the photographing lens L or an optical filter that changes the spectrum of light incident on the photographing lens L. A cylindrical exterior portion 102 is disposed behind the lens barrel 1. The movable member 30 and the rectilinear guide member 40 are disposed inside the exterior portion 102.

  2A and 2B are perspective views of the lens barrel 1. FIG. FIG. 3 is an exploded perspective view of the lens barrel 1. In FIGS. 2 and 3, in order to facilitate the description of the configuration, the description of some members such as the fixed lens L <b> 1, the exterior parts 100 and 102, the optical member 101, and the operation part 70 (described later) is omitted. Further, in FIG. 3, the description of the cam follower 90 (described later) and the movable lens L2 is omitted.

  Both the main body 10 and the rectilinear guide member 40 have a cylindrical shape. The main body 10 and the rectilinear guide member 40 are arranged and connected side by side in the optical axis direction. The connection between the main body 10 and the rectilinear guide member 40 is performed by, for example, screwing or adhesive fixing. In addition, the main-body part 10 and the rectilinear guide member 40 may be integrally formed.

  The fixed lens L1 is a lens group having one or a plurality of lenses. The fixed lens L1 is fitted and fixed inside the main body 10. The movable lens L2 is a lens group having a plurality of lenses, and includes a movable lens L2-1 and a movable lens L2-2. At least a part of the movable lens L2 is accommodated in the rectilinear guide member 40, and is movable in the optical axis direction with respect to the rectilinear guide member 40.

  The drive ring 20 is fitted to the main body 10 so as to follow the outer peripheral surface of the main body 10. The drive ring 20 can rotate around the optical axis AX with respect to the main body 10. The drive ring 20 includes one or more rolling rollers 21 having a rotation center axis in a radial direction with respect to the optical axis AX (an axial direction parallel to a plane perpendicular to the optical axis AX and passing through the optical axis AX). . The drive ring 20 is sandwiched in the front-rear direction by two annular rotary plates 50A and 50B. Both of the two rotary plates 50A and 50B are disposed along the outer peripheral surface of the main body 10 and can be rotated around the optical axis AX.

  An annular motor (driving means) 60 is fitted to the main body 10 so as to be along the outer peripheral surface of the main body 10. The motor 60 is disposed behind the rotating plate 50A, and rotationally drives the rotating plate 50A around the optical axis AX. As the motor 60, for example, an annular ultrasonic motor is used. The motor 60 is not limited to an annular ultrasonic motor as long as the rotary plate 50A can be rotationally driven. For example, an ultrasonic motor, a DC motor, a brushless DC motor, or a stepping motor that can move linearly is used for the motor 60. Further, the output portion of the motor 60 does not need to be in direct contact with the rotating plate 50A, and the output from the motor 60 is converted into a driving force for rotating the rotating plate 50A between the motor 60 and the rotating plate 50A. (For example, a gear or a cam mechanism) may be provided.

  A cylindrical operation unit 70 is fitted on the outer peripheral surface of the main body 10. The inner peripheral surface of the operation unit 70 is fixed to the outer peripheral surface of the rotating plate 50B. When the operating unit 70 is rotated by a user operation, the rotating plate 50B rotates around the optical axis AX.

  An elastic member 61 such as a plate spring or a coil spring is disposed behind the motor 60. The motor 60 is pressed against the rotating plate 50A by the elastic force of the elastic member 61. Further, the rotating plate 50A presses the drive ring 20 toward the rotating plate 50B by this elastic force. Thereby, the rolling roller 21 of the drive ring 20 is clamped in a pressed state by the front surface of the rotating plate 50A and the rear surface of the rotating plate 50B. When the rotating plate 50A is rotationally driven by the motor 60, or when the rotating plate 50B is manually rotated via the operation unit 70, the rolling roller 21 moves to the front surface of the rotating plate 50A and the rear of the rotating plate 50B. Roll on the surface. The drive ring 20 rotates around the optical axis AX according to the rolling of the rolling roller 21. In the present embodiment, since the rolling roller 21 is held in a pressed state with respect to the rotating plate 50A and the rotating plate 50B, the frictional force between the rolling roller 21 and the rotating plate 50A and the rotating plate 50B is reduced. The driving force is smoothly transmitted from the rotary plate 50A or the rotary plate 50B to the drive ring 20.

  The drive ring 20 is connected to the movable member 30 by a pair of connection members 80. Therefore, when the drive ring 20 rotates around the optical axis AX, the movable member 30 rotates around the optical axis AX accordingly. A method of connecting the drive ring 20 and the movable member 30 and the configuration of the connecting member 80 will be described later.

  The linear guide member 40 is fitted to the movable member 30 so as to enter the movable member 30. The movable member 30 can rotate around the optical axis AX with respect to the rectilinear guide member 40. The movable member 30 and the rectilinear guide member 40 are provided with engaging portions 31 and 41 that engage with each other in the optical axis direction. When the engaging portion 31 of the movable member 30 and the engaging portion 41 of the rectilinear guide member 40 abut on each other in the optical axis direction, the movable member 30 is restricted from moving relative to the rectilinear guide member 40 in the optical axis direction. The For example, a bayonet is used for the engagement between the movable member 30 and the rectilinear guide member 40.

  One or more helical cam grooves 32 are formed on the peripheral surface of the movable member 30. In this embodiment, as shown in FIG. 3, three cam grooves 32 are provided. Each cam groove 32 is formed so as to penetrate the wall surface of the movable member 30. Further, the same number of rectilinear grooves 42 as the cam grooves 32 are formed on the peripheral surface of the rectilinear guide member 40. Each rectilinear groove 42 has an elongated shape in the optical axis direction. Each rectilinear groove 42 is formed to penetrate the wall surface of the rectilinear guide member 40.

  The same number of cam followers 90 as the cam grooves 32 are provided on the outer peripheral portion of the movable lens L2. The cam follower 90 is a roller having a rotation center axis in a radial direction with respect to the optical axis AX (an axial direction parallel to a plane perpendicular to the optical axis AX and passing through the optical axis AX). Each cam follower 90 is disposed in the rectilinear groove 42 of the rectilinear guide member 40 and the cam groove 32 of the movable member 30.

  When the movable member 30 rotates around the optical axis AX, the cam follower 90 moves along the cam groove 32. The cam follower 90 is in contact with the wall surface of the rectilinear groove 42 in the circumferential direction, so that movement in the circumferential direction is restricted. On the other hand, the cam groove 32 has a spiral shape inclined with respect to the circumferential direction and the optical axis direction. Therefore, when the movable member 30 having the cam groove 32 rotates, the cam follower 90 moves in the optical axis direction in a state where movement in the circumferential direction is restricted by the rectilinear groove 42. In response to the movement of the cam follower 90, the movable lens L2 moves in the optical axis direction.

  Thus, in the present embodiment, when the drive ring 20 is rotationally driven by the motor 60 or manually, the drive force applied to the drive ring 20 is transmitted to the movable member 30 via the connection member 80. The rotational movement of the movable member 30 is converted into a linear movement in a direction parallel to the optical axis AX by the cam groove 32 and the cam follower 90. Thereby, the driving force in the rotational direction applied to the movable member 30 is transmitted to the movable lens L2 as the driving force in the optical axis direction, and the movable lens L2 moves in the optical axis direction. By moving the movable lens L2, the magnification, focus position, and the like of the photographing lens L can be changed.

[Configuration of Connection Member 80]
Next, the configuration of the connection member 80 and the method for connecting the drive ring 20 and the movable member 30 in the present embodiment will be described.

  Of the pair of connection members 80, one (first connection member 81) is fixed to the drive ring 20, and the other (second connection member 82) is fixed to the movable member 30. Both the first connecting member 81 and the second connecting member 82 have a plate shape that is long in the optical axis direction. Further, the first connection member 81 and the second connection member 82 are disposed to face each other with the optical axis AX interposed therebetween. In other words, the first connection member 81 and the second connection member 82 are arranged with an interval of about 180 degrees around the optical axis AX.

  The first connecting member 81 has a front end 81 </ b> A fixed to the drive ring 20. The first connecting member 81 and the drive ring 20 may be fixed so as not to move with respect to each other. For example, screwing or adhesion is used as the fixing method. Further, the first connecting member 81 and the drive ring 20 may be integrally formed. The first connection member 81 has a plate shape extending rearward from a place where it is fixed to the drive ring 20.

  FIG. 4A is a view showing a structure near the engaging portion between the movable member 30 and the first connecting member 81. The movable member 30 is formed with an engagement groove 33 that abuts and engages with a rear end portion (a sandwiched portion) 81B of the first connection member 81. The engagement groove 33 has a pair of wall surfaces (contact surfaces) 33B parallel to a surface orthogonal to the circumferential direction. The depth of the engagement groove 33 in the radial direction is larger than the thickness of the rear end portion 81B in the radial direction. The circumferential width of the engagement groove 33 is slightly smaller than the circumferential width of the rear end portion 81B, and the rear end portion 81B can be inserted into the engagement groove 33. When the rear end portion 81B is inserted into the engagement groove 33, the side end surface in the circumferential direction of the rear end portion 81B is sandwiched by the contact surface 33B of the engagement groove 33. As a result, the rear end portion 81B and the engagement groove 33 abut on each other in different directions in the circumferential direction. Further, in a state where the rear end portion 81B is inserted into the engagement groove 33, a gap 33A is formed in both directions in the radial direction of the rear end portion 81B in the engagement groove 33. Therefore, even if the rear end portion 81B moves in the radial direction, the engagement between the rear end portion 81B and the engagement groove 33 is maintained as long as the amount of movement is smaller than the size of the gap 33A.

  The second connecting member 82 has a rear end 82 </ b> A fixed to the movable member 30. The second connecting member 82 and the movable member 30 only need to be fixed so as not to move with respect to each other. For example, screwing or adhesion is used as the fixing method. Further, the second connection member 82 and the movable member 30 may be integrally formed. The second connecting member 82 has a plate shape extending rearward from a fixed position with the movable member 30. FIG. 4B is a view showing a structure near the engagement portion between the drive ring 20 and the second connection member 82. The front end portion 82B of the second connection member 82 has a U shape as shown in FIG. In the U shape, a cut portion 82B1 penetrating in the radial direction is formed. The cut portion 82B1 has a pair of wall surfaces (abutment surfaces) 82C parallel to a surface orthogonal to the circumferential direction.

  The drive ring 20 is formed with an engagement protrusion (a sandwiched portion) 23 that contacts and engages the U-shaped front end portion 82B. The engagement protrusion 23 has a columnar shape, and the radial height is larger than the radial thickness of the front end portion 82B. Further, the circumferential width (diameter) of the engagement protrusion 23 is slightly smaller than the circumferential width of the cut portion 82B1 of the front end portion 82B, and the engagement protrusion 23 can be inserted into the cut portion 82B1. When the engagement protrusion 23 is inserted into the cut portion 82B1, the side end surface in the circumferential direction of the engagement protrusion 23 is sandwiched between the pair of contact surfaces 82C of the cut portion 82B1. As a result, the front end portion 82B and the engagement protrusion 23 abut on each other in different directions in the circumferential direction. In addition, in a state where the engagement protrusion 23 is inserted into the cut portion 82B1, the front end portion 82B is disposed near the center of the engagement protrusion 23 in the radial direction. Therefore, there is a region 23A that is not engaged with the notch 82B1 in both radial directions of the engagement protrusion 23. Therefore, even if the front end portion 82B moves in the radial direction, the engagement between the front end portion 82B and the engagement protrusion 23 is maintained as long as the movement amount is smaller than the height of the region 23A.

  Thus, although the front end 81A of the first connecting member 81 is fixed to the drive ring 20, the rear end 81B is in contact with the movable member 30 (engagement groove 33) only in the circumferential direction. Yes. In addition, the rear end 82A of the second connection member 82 is fixed to the movable member 30, but the front end 82B is in contact with the drive ring 20 (engagement protrusion 23) only in the circumferential direction. In other words, the drive ring 20 and the movable member 30 are in contact with each other in different circumferential directions via the first connection member 81 and the second connection member 82 and are not in contact in the radial direction. With this configuration, the lens barrel 1 of the present embodiment is easy to assemble compared to a conventional lens barrel.

[Description of conventional lens barrel]
The conventional lens barrel has a problem that the drive ring and the movable member cannot be easily connected. For example, in the lens barrel described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2014-197240), when assembling the lens barrel, first, one end (first lever) of the connecting member (connecting lever 9) that is long in the optical axis direction is used. The engagement groove 91a) of the one piece 91 is engaged with the protrusion (engagement piece 43) of the drive ring (output ring 4). Next, with the connecting member engaged with the protrusion, the other end (second piece 92) of the connecting member is fixed to the movable member (lens operation ring 8) by screwing. Therefore, the connecting member and the drive ring are engaged in an unstable state until the connecting member is fixed to the movable member. The assembly operator needs to fix the connecting member to the movable member while holding the connecting member so as not to be displaced with respect to the drive ring. Therefore, the assembly procedure described in Patent Document 1 has a problem that the assembly work becomes complicated and a problem that productivity is low.

  Further, in the assembly procedure of the lens barrel described in Patent Document 1, in a state where the connecting member is not fixed to the movable member, the connecting member can rotate around the engagement portion with respect to the drive ring. Further, in the lens barrel described in Patent Document 1, even if the connecting member is at a position deviated from the design, the connecting member can be fixed to the movable member by adjusting the movable member to the position of the connecting member. Therefore, in the lens barrel described in Patent Document 1, even if there is no error in the dimensions of each member, the connecting member can be fixed in a misaligned state, so that the assembly of the lens barrel is completed. In this case, there is a possibility that a positional deviation has occurred between the members.

  Further, in the lens barrel described in Patent Document 1, if the connection member is fixed to the movable member before engaging the drive ring, the drive ring and the movable member may not be connected. Specifically, in the lens barrel described in Patent Document 1, a groove is formed on the outer peripheral surface of the drive ring protrusion (engagement piece 43) so that the connection member is fitted, as shown in FIGS. Is formed. Therefore, in order to engage the connection member with the protrusion, the position of the connection member and the position of the groove of the protrusion need to match. Therefore, if the connecting member is fixed to the movable member at a position deviated from the design, the position of the connecting member cannot be matched with the position of the groove of the protrusion, and the drive ring and the movable member may not be connected. There is.

  Furthermore, in the lens barrel described in Patent Document 1, the connection member is engaged with the protrusion of the drive ring so that it cannot move in both the circumferential direction and the radial direction with respect to the optical axis direction. Therefore, when the drive ring is rotated in a state where the drive ring or the movable member is decentered from the optical axis due to a state where an axial deviation occurs between the drive ring and the movable member, or a manufacturing error or an assembly error, There is a risk that compressing force or tension is applied to the connecting member, and the connecting member, the engaging part between the connecting member and the drive ring, the fixing part of the connecting member to the movable member, and the like are damaged.

[Explanation regarding assembly of lens barrel 1 according to this embodiment]
FIG. 5 shows only the drive ring 20, the movable member 30, the first connection member 81, and the second connection member 82 in the lens barrel 1 of the present embodiment. In the present embodiment, when the lens barrel 1 is assembled, as shown in FIG. 3, the front end 81A of the first connection member 81 is fixed to the drive ring 20, and the rear end 82A of the second connection member 82 is movable. It is fixed to the member 30. Therefore, as shown in FIGS. 4 and 5, the rear end portion 81B of the first connection member 81 is engaged with the engagement groove 33 of the movable member 30, and the front end portion 82B of the second connection member 82 is connected to the drive ring. By engaging with the 20 engaging projections 23, the drive ring 20 and the movable member 30 can be easily connected.

  In the present embodiment, the first connection member 81 is fixed to the drive ring 20 and the second connection member 82 is fixed to the movable member 30 before connecting the drive ring 20 and the movable member 30. Thereby, when connecting the drive ring 20 and the movable member 30, it is not necessary to hold the connecting members 81 and 82, and the assembly work of the lens barrel 1 is facilitated.

  Furthermore, in the present embodiment, when a manufacturing error occurs in the dimensions and shapes of the drive ring 20, the movable member 30, the connection members 81, 82, etc., or an axis shift occurs between the drive ring 20 and the movable member 30. In the case where there is an error in the shape and position of each member, such as when the drive ring 20 and the movable member 30 are eccentric, it is difficult for the driving force to be transmitted from the drive ring 20 to the movable member 30. In addition, the lens barrel 1 can be easily assembled while preventing the members from being damaged.

  For example, when an axis deviation occurs between the drive ring 20 and the movable member 30, or when the drive ring 20 or the movable member 30 is eccentric, at least one rotation center axis of the drive ring 20 or the movable member 30 Does not coincide with the optical axis AX, and is shifted in the radial direction with respect to the optical axis AX. However, the drive ring 20 and the movable member 30 in the present embodiment are in contact with each other in the circumferential direction via the connection members 81 and 82, but are not in contact with each other in the radial direction. The relative position in the direction can be moved. As a result, even when the central axis of the drive ring 20 or the movable member 30 is displaced in the radial direction from the optical axis AX, the drive ring 20 and the movable member 30 can be easily changed by changing the relative positions of both in the radial direction. It becomes possible to connect. Further, the relative position in the radial direction of the drive ring 20 and the movable member 30 can be moved even when the lens barrel 1 is assembled. For this reason, even if the drive ring 20 rotates in a state where the axis is displaced between the drive ring 20 and the movable member 30, the connection members 81 and 82 move in the radial direction, so that the connection members 81 and 82 and the connection members 81 and 82 are connected. It is possible to reduce the load applied to the fixed portions of the members 81 and 82, and to prevent the members and the fixed portions of the members from being damaged.

  Further, when an axial deviation occurs between the drive ring 20 and the movable member 30, for example, the drive ring 20 is axially displaced in a direction parallel to the radial direction indicated by the arrow A in FIG. The axis is shifted in the direction indicated by the arrow A ′ opposite to the arrow A. The first connecting member 81 and the movable member 30, and the second connecting member 82 and the drive ring 20 can be engaged with each other in a state where the shaft is displaced in the radial direction. Therefore, the lens barrel 1 including the drive ring 20 and the movable member 30 can be easily assembled even if the drive ring 20 and the movable member 30 are misaligned in the directions indicated by the arrows A and A ′, respectively. Can do. Further, since the driving ring 20 and the movable member 30 are in contact with each other in the circumferential direction via the connection members 81 and 82, the driving force for rotating the driving ring 20 around the optical axis AX is applied to the movable member 30 and the movable lens. L2 can be transmitted smoothly.

  In FIG. 5, even if the rotation center axis O ′ of the movable member 30 is inclined in the direction indicated by the arrow B with respect to the rotation center axis O of the drive ring 20, the first connection member 81 and the movable member 30, The second connecting member 82 and the drive ring 20 can be engaged. Also in this case, since the driving ring 20 and the movable member 30 are in contact with each other in the circumferential direction via the connecting members 81 and 82, the driving force can be transmitted smoothly.

  Furthermore, in this embodiment, as shown in FIG. 5, the engagement protrusion 23 of the drive ring 20 has a cylindrical shape having a central axis in the radial direction. Therefore, the engagement protrusion 23 and the front end portion 82B of the second connecting member 82 are not in contact with a plane but in a line parallel to the radial direction, and the engagement projection 23 and the front end portion 82B are in a plane orthogonal to the radial direction. It is relatively rotatable. This direction of rotation is indicated by arrow C in FIG. As a result, when the axial deviation occurs between the drive ring 20 and the movable member 30 or when the drive ring 20 and the movable member 30 are eccentric, the drive ring 20 and the second connection member 82 are relatively moved. By rotating, the drive ring 20 and the movable member 30 can be easily connected.

  Further, in the present embodiment, not only the positional deviation between the drive ring 20 and the movable member 30 as indicated by arrows A, A ′, B, and C in FIG. Even when the member is displaced, the lens barrel 1 can be easily assembled and the driving force can be transmitted smoothly. For example, when the first connection member 81 is fixed at a position or angle deviated from the design with respect to the drive ring 20, or when the second connection member 82 is deviated from design with respect to the movable member 30, Even when the angle is fixed, the drive ring 20 and the movable member 30 can be connected to each other by relatively moving or rotating the position. In addition, even when the first connection member 81 and the second connection member 82 are distorted or twisted, the drive ring 20 and the movable member 30 can be easily connected.

  In the present embodiment, the rear end portion 81B of the first connection member 81 is not in contact with the movable member 30 (engagement groove 33) in the optical axis direction. Further, the front end portion 82B of the second connection member 82 is not in contact with the drive ring 20 (engagement protrusion 23) in the optical axis direction. In other words, the relative positions of the drive ring 20 and the movable member 30 in the optical axis direction are not fixed. Therefore, the drive ring 20 and the movable member 30 can be easily moved or rotated relative to each other.

  In the present embodiment, an annular ultrasonic motor is used as the motor 60 that rotationally drives the drive ring 20. The ultrasonic motor includes a piezoelectric element, a stator, and a rotor. When the piezoelectric element is deformed by applying a voltage, the stator is deformed by the deformation. At this time, the surface of the stator in contact with the rotor is deformed to draw an elliptical orbit. The rotor moves due to the deformation of the stator. As described above, since the ultrasonic motor rotates the rotor while the piezoelectric element and the stator are deformed, the rotation center axis of the ultrasonic motor may be eccentric. Since the ultrasonic motor is pressed against and contacted with the drive ring 20 via the rotary plate 50A, the drive ring 20 may also be eccentrically rotated due to the eccentric rotational movement of the ultrasonic motor. However, in this embodiment, since the drive ring 20 and the movable member 30 are not in contact with each other in the radial direction, even if the drive ring 20 is eccentric and rotates, the movable member 30 is prevented from being eccentric. can do.

  The above is the description of the exemplary embodiments of the present invention. Embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical idea of the present invention. For example, the embodiment of the present invention also includes contents appropriately combined with embodiments or the like clearly shown in the specification or obvious embodiments.

[Modification]
For example, in the above-described embodiment, in the state where the rear end portion 81B is inserted into the engagement groove 33, the gap 33A is opened in both directions in the radial direction of the rear end portion 81B in the engagement groove 33. The embodiment of the present invention is not limited to this configuration. The gap 33A may be provided only in one of the radial directions. For example, in the configuration shown in FIG. 4A, the rear end portion 81B is in contact with the movable member 30 (the bottom surface of the engagement groove 33) on the other side in the radial direction. As described above, when the gap 33A is provided only in any one of the radial directions, the rear end 81B is in contact with the movable member 30 while the engagement between the rear end 81B and the engagement groove 33 is maintained. It can move in at least one direction.

  Further, in the above-described embodiment, in the state where the engagement protrusion 23 is inserted into the cut portion 82B1, there are regions 23A that are not engaged with the cut portion 82B1 in both radial directions of the engagement protrusion 23. The embodiment of the present invention is not limited to this configuration. The region 23A may exist only in one of the radial directions. For example, in the configuration shown in FIG. 4B, the front end portion 82B is in contact with the drive ring 20 (the base portion of the engaging protrusion 23) on the other side in the radial direction. As described above, when the region 23A exists only in one of the radial directions, the front end 82B moves in at least one direction with respect to the drive ring 20 while the engagement between the front end 82B and the notch 82B1 is maintained. Is possible.

  Further, a method similar to the method of connecting the second connecting member 82 and the drive ring 20 may be applied to the method of connecting the first connecting member 81 and the movable member 30. In this case, the rear end portion 81 </ b> B of the first connection member 81 has a U shape like the front end portion 82 </ b> B of the second connection member 82. Further, the movable member 30 is formed with a cylindrical engagement protrusion 23 that engages with the U-shaped rear end portion 81B. When the U-shaped rear end portion 81 </ b> B engages with the engagement protrusion 23 of the movable member 30, the first connection member 81 and the movable member 30 abut on each other in the circumferential direction.

  Further, a method similar to the method of connecting the first connecting member 81 and the movable member 30 may be applied to the method of connecting the second connecting member 82 and the drive ring 20. In this case, the front end portion 82B of the second connection member 82 has a plate shape like the rear end portion 81B of the first connection member 81. Further, the drive ring 20 is formed with an engagement groove 33 that engages with the plate-like front end portion 82B. When the plate-like front end portion 82B engages with the engagement groove 33 of the drive ring 20, the second connection member 82 and the drive ring 20 abut in the circumferential direction.

  Moreover, the connection method of the 1st connection member 81 and the movable member 30, and the connection method of the 2nd connection member 82 and the drive ring 20 are not limited to the method shown to Fig.4 (a) and FIG.4 (b).

  FIG. 6A to FIG. 6C show a method of connecting the first connecting member 81 and the movable member 30 in a modification of the present embodiment. Note that the connection method shown in FIGS. 6A to 6C may be applied to the connection method of the second connection member 82 and the drive ring 20. The configuration shown in FIGS. 6A to 6C is that the plate-like rear end portion 81B of the first connection member 81 is engaged with the engagement groove 33 of the movable member 30, as shown in FIG. The connection method shown in a) is common. However, in the configuration shown in FIG. 6A, the portion inserted into the engagement groove 33 is formed as a convex curved surface among the side end surfaces in the circumferential direction of the rear end portion 81B. The convex curved surface is formed so as to protrude in the circumferential direction when viewed from a direction parallel to the radial direction. When the rear end portion 81B is inserted into the engagement groove 33, the convex curved surface of the rear end portion 81B and the circumferential wall surface of the engagement groove 33 abut on a line parallel to the radial direction. Therefore, the first connecting member 81 and the movable member 30 are relatively rotatable in a plane orthogonal to the radial direction. By relatively rotating the first connecting member 81 and the movable member 30, the first connecting member 81 and the movable member 30 can be easily connected, and the driving force from the driving ring 20 to the movable member 30 can be smoothly smoothed. Can be voltage.

  In the configuration shown in FIG. 6B, unlike the configuration shown in FIG. 6A, the circumferential wall surface (contact surface 33B) of the engagement groove 33 is formed in a convex curved surface. Even in this configuration, the first connecting member 81 and the movable member 30 can be relatively rotated in a plane orthogonal to the radial direction.

  In the configuration shown in FIG. 6C, the side end surface of the rear end portion 81B is formed in a convex curved surface, as in the configuration shown in FIG. The convex curved surface is formed so as to protrude in the circumferential direction when viewed from a direction parallel to the optical axis AX. When the rear end portion 81B is inserted into the engagement groove 33, the convex curved surface of the rear end portion 81B and the circumferential wall surface of the engagement groove 33 abut on a line parallel to the optical axis direction. Therefore, the first connecting member 81 and the movable member 30 are relatively rotatable in a plane orthogonal to the optical axis AX.

  FIG. 7A and FIG. 7B show a method for connecting the first connecting member 81 and the movable member 30 in another modification of the present embodiment. Note that the connection method shown in FIGS. 7A and 7B may be applied to the connection method of the second connection member 82 and the drive ring 20. The configuration shown in FIGS. 7A and 7B is the same as that shown in FIG. 4A in that the rear end portion 81B of the first connection member 81 is engaged with the engagement groove 33 of the movable member 30. The connection method shown is common. However, in the configuration shown in FIG. 7A, the rear end portion 81B has a cylindrical shape having a central axis parallel to the optical axis AX, not the plate shape as shown in FIG. Therefore, when the rear end portion 81B is inserted into the engagement groove 33, the outer peripheral surface of the rear end portion 81B and the circumferential wall surface of the engagement groove 33 abut on a line parallel to the optical axis direction. Thereby, the 1st connection member 81 and the movable member 30 become relatively rotatable within the plane orthogonal to the optical axis AX.

  In the configuration shown in FIG. 7B, unlike the configuration shown in FIG. 7A, the portion of the outer peripheral surface of the rear end portion 81B that is inserted into the engagement groove 33 is formed into a spherical surface. . Therefore, when the rear end portion 81B is inserted into the engagement groove 33, the spherical surface of the rear end portion 81B and the circumferential wall surface of the engagement groove 33 come into contact with each other at a point. Thereby, the 1st connection member 81 and the movable member 30 become relatively rotatable in the plane orthogonal to the optical axis AX and the plane orthogonal to the radial direction.

  FIG. 8 shows a method of connecting the second connection member 82 and the drive ring 20 in another modification of the present embodiment. Note that the connection method illustrated in FIG. 8 may be applied to a connection method between the first connection member 81 and the movable member 30. The configuration shown in FIG. 8 is common to the connection method shown in FIG. 4B in that the front end portion 82B of the second connection member 82 is engaged with the engagement protrusion 23 of the drive ring 20. However, in the present modification, the front end portion 82B of the second connection member 82 has an O-shape instead of a U-shape. A through hole 82B2 penetrating in the radial direction is formed in the O-shaped front end portion 82B. By inserting the engagement protrusion 23 into the through hole 2B2, the outer peripheral surface of the engagement protrusion 23 and the inner wall surface (contact surface) of the through hole 82B2 come into contact with a line parallel to the radial direction. Thereby, the engagement protrusion 23 and the front end part 82B are relatively rotatable in a plane orthogonal to the radial direction.

DESCRIPTION OF SYMBOLS 1 Lens barrel 10 Main part 20 Drive ring 30 Movable member 40 Straight guide member 50A, 50B Rotating plate 60 Motor 61 Elastic member 70 Operation part 80 Connection member 81 1st connection member 82 2nd connection member 90 Cam follower 100 Exterior part 101 Optical Member 102 exterior L photographing lens L1 fixed lens L2 movable lens

Claims (10)

The main body,
A driving member provided to be rotatable about the optical axis with respect to the main body;
A movable member that is disposed at a distance from the drive member in the optical axis direction and is rotatable about the optical axis;
An optical member movable in the optical axis direction by the rotational movement of the movable member;
With
The drive member has a first connection member having one end in the optical axis direction fixed to the drive member and extending from the one end toward the movable member,
The movable member has a first contact portion that contacts the other end of the first connection member,
The movable member has a second connection member having one end in the optical axis direction fixed to the movable member and extending from the one end toward the drive member,
The drive member has a second contact portion that contacts the other end of the second connection member.
Lens barrel. The first connecting member and the second connecting member are disposed to face each other with the optical axis in between.
The lens barrel according to claim 1. The first contact portion is in contact with the other end of the first connecting member in different directions in the circumferential direction with respect to the optical axis;
The second contact portion is in contact with the other end of the second connection member in both different directions in the circumferential direction with respect to the optical axis;
The lens barrel according to claim 1 or 2. The other end of the first connection member is not in contact with the movable member in at least one of the radial directions with respect to the optical axis,
The other end of the second connection member is not in contact with the drive member in at least one direction in the radial direction with respect to the optical axis.
The lens barrel according to any one of claims 1 to 3. The other end of the first connection member is not in contact with the movable member in two different directions in the radial direction,
The other end of the second connection member is not in contact with the drive member in both different directions in the radial direction.
The lens barrel according to claim 4. One of the other end of the first connecting member and the first abutting portion is a first clamping portion having a pair of first abutting surfaces, and the other is a first covered portion clamped by the first clamping portion. The clamping part,
The lens barrel according to any one of claims 1 to 5. Of the other end of the second connecting member and the second abutting portion, one is a second sandwiching portion having a pair of second abutting surfaces, and the other is a second sandwiched portion sandwiched by the second sandwiching portion. The clamping part,
The lens barrel according to any one of claims 1 to 6. A driving means for rotating the driving member;
Each of the first connecting member and the second connecting member connects the driving member and the movable member at a position radially outside the driving means with respect to the optical axis;
The lens barrel according to any one of claims 1 to 7. The driving means is an annular ultrasonic motor;
The lens barrel according to claim 8. A first rotating body rotatable around the optical axis by the driving means;
A second rotating body rotatable around the optical axis by manual operation;
Further comprising
The driving member includes a rolling roller that is sandwiched between the first rotating body and the second rotating body in a direction parallel to the optical axis,
The rolling roller rolls by rotating the first rotating body or the second rotating body, and the driving member rotates around the optical axis by rolling of the rolling roller.
The lens barrel according to claim 8 or 9.

Images