JP4485813B2 - Lens barrel - Google Patents

Description

  The present invention relates to a lens barrel having a rotating ring that performs rotation advance / retreat to change the position in the optical axis direction and fixed position rotation that does not move in the optical axis direction.

  A lens barrel of a type in which a rotating ring such as a cam ring is rotated forward from the lens barrel storage position until it reaches the shooting region, and is rotated at a fixed position without moving in the optical axis direction when it reaches the shooting region. It has been known. Conventionally, the mechanism for giving such an operation to the rotating ring tends to be complicated and large. In addition, when the rotating ring has a specific angular position for assembly / disassembly that is not used in a normal use state, a stopper mechanism that restricts the rotation to the specific angle position in the use state is required.

  However, if the rotary ring is of the type that rotates and retreats and rotates at a fixed position as described above, the stopper mechanism becomes complicated and it is difficult to obtain a reliable stopper effect. SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel that can reliably limit the rotation angle of a rotary ring that performs forward and backward rotation and fixed position rotation with a simple structure.

  The lens barrel of the present invention is rotatable about a rotation center axis parallel to the optical axis, and is a rotating ring that moves at least one optical element in the optical axis direction by the rotation; A non-rotating outer annular member having a circumferential groove on the inner circumferential surface opposed to the outer annular member; provided between the inner circumferential surface of the outer annular member and the outer circumferential surface of the rotating ring; A rotation advance / retreat mechanism for moving the rotary ring back and forth between the front and rear moving ends in the optical axis direction with respect to the member; one rotary end in the optical axis direction of the rotary ring provided on the outer circumferential surface of the rotary ring. A rotating guide projection that engages with the circumferential groove and rotates the rotating ring in a fixed position without moving it in the optical axis direction, and can be inserted into and removed from the intermediate position in the length direction of the circumferential groove. Rotating in the circumferential groove by engaging the rotation guide projection in the inserted state in the circumferential groove Characterized by comprising a; to limit the rotation angle, the stopper member to release the restriction in removed state.

The lens barrel of the present invention further includes an interlocking rotating ring that is relatively movable in the optical axis direction with the rotating ring and rotates integrally in the rotating direction; provided on the outer peripheral surface of the interlocking rotating ring, and the rotation guide protrusion is provided in the circumferential groove. An optical axis direction movement restricting projection that simultaneously engages with the circumferential groove at a relative position in the optical axis direction of the rotating ring and the outer annular member that engages with each other; And a protrusion insertion / removal hole in the optical axis direction formed in communication with the circumferential groove at a specific disassembly angle position in the rotation direction of the outer annular member, and the stopper member is inserted in the circumferential groove. It is preferable to function so as to restrict the rotation of the rotating ring and the interlocking rotating ring to the specific decomposition angle position.
When such an interlocking rotating ring is provided, the rotating ring and the interlocking rotating ring are urged away from each other by the urging member, and the rotation guide protrusion and the optical axis direction movement restricting protrusion are opposed to each other on the opposite side of the circumferential groove. It is preferable to be pressed against the wall surface.

  The lens barrel of the present invention is also capable of rotating about a rotation center axis parallel to the optical axis, and a pair of rotating rings that move at least one optical element in the direction of the optical axis by the rotation; A non-rotating outer annular member having a circumferential groove on the inner circumferential surface that supports and faces the rotating ring; provided between the inner circumferential surface of the outer annular member and the outer circumferential surface of the rotating ring, and rotates the rotating ring. A rotary advance / retreat mechanism for moving the rotary ring back and forth between the front and rear moving ends in the optical axis direction with respect to the outer annular member; the rotary ring provided on one outer peripheral surface of the pair of rotary rings. Rotating guide protrusion that engages with the circumferential groove and rotates in a fixed position without moving the rotating ring in the optical axis direction when moved to one moving end in the optical axis direction; on the outer peripheral surface of the other rotating ring Rotating ring and outer annular portion provided with this rotation guide projection engaging with the circumferential groove The optical axis direction movement restricting projection that simultaneously engages with the circumferential direction groove at the relative position in the optical axis direction; the optical axis direction movement restricting projection formed on the outer annular member at the specific disassembly position in the rotational direction. A protrusion insertion / removal hole that can be engaged / disengaged in the optical axis direction; and can be inserted / removed in the middle of the circumferential groove in the length direction, and engaged with the rotation guide protrusion in the inserted state in the circumferential groove And a stopper member for restricting the rotation of the pair of rotating rings to the fixed disassembly position and releasing the restriction in the detached state.

  In this lens barrel, the pair of rotating rings are urged away from each other by the urging member, and the rotation guide protrusion and the optical axis direction movement restricting protrusion that engage with the circumferential groove are opposite to the circumferential groove. It is preferable to be pressed against the opposite wall surface.

  In the lens barrel of each of the above aspects, a plurality of rotation guide protrusions and circumferential grooves are provided at different positions in the circumferential direction, and the stopper member is engaged with one of the plurality of rotation guide protrusions. Good.

  Moreover, it is preferable that the stopper member is insertable / removable toward the radial direction of the outer annular member with respect to the circumferential groove.

  For example, a radial through hole that penetrates the outer peripheral surface of the outer annular member and the bottom of the circumferential groove in the radial direction may be provided, and the stopper member may be engaged with and disengaged from the radial through hole. Specifically, a circumferential arm portion that is mounted along the outer peripheral surface of the outer annular member, and projects from the circumferential arm portion toward the inner diameter direction of the outer annular member, and can be inserted into and removed from the radial through hole. It is advisable to provide the stopper member with such a locking projection. Furthermore, it is good to provide the fixing means which fixes the circumferential direction arm part of a stopper member to an outer side annular member.

  The fixing means includes a screw insertion hole and a hook portion at one end and the other end of the circumferential arm portion of the stopper member, a positioning projection that can be engaged with the hook portion, and an engagement between the positioning projection and the hook portion. It is preferable that the outer annular member has a screw hole that overlaps the screw insertion hole on the stopper member side in the state.

  The rotation advance / retreat mechanism for advancing and retreating the rotary ring includes a male helicoid formed on the outer peripheral surface of the rotary ring and the inner peripheral surface of the outer annular member in such a manner that the screw is released when the rotation guide protrusion and the circumferential groove are engaged. A female helicoid is preferred. In this case, a non-helicoid region that is parallel to the female helicoid and communicates with the circumferential groove is formed on the female helicoid forming region on the inner peripheral surface of the outer annular member, and the rotation guide protrusion is formed when the male helicoid and the female helicoid are screwed together. Is preferably located within the helicoid-free region.

  The present invention can be applied to a single-focus lens barrel and a zoom lens barrel, and the form of the optical element driven by the rotating ring is not limited. For example, a plurality of lens groups can be formed by rotating the rotating ring. It can be moved relative to the optical axis direction.

  The outer annular member may be a movable member or a non-movable member in the optical axis direction as long as the rotation is restricted, but may be a fixed member fixed to the camera body, for example.

  According to the present invention as described above, it is possible to obtain a lens barrel capable of reliably performing the limitation of the rotation angle with respect to the rotating ring that performs the rotation advance / retreat and the fixed position rotation with a simple structure.

  Hereinafter, the present invention will be described based on illustrated embodiments. In addition, in order to make it easy to identify a member, in some drawings, the thickness of the outline line is different for each member or the line type is different. In the cross-sectional views, there are actually places at different positions in the circumferential direction, but there are places on the same cross-section in the drawing.

[Entire description of zoom lens barrel]
First, the overall structure of the zoom lens barrel 71 of this embodiment will be described with reference to FIGS. As shown in FIGS. 6 and 7, the zoom lens barrel 71 is mounted on the digital camera 70, and the photographing optical system has a first lens group LG1, a shutter S and an aperture A, and a second lens in order from the object side. It includes a group LG2, a third lens group LG3, a low-pass filter (filters) LG4, and a CCD (solid-state imaging device) 60. The optical axis of the photographing optical system is Z1. The photographing optical axis Z1 is parallel to the rotation center axis (hereinafter referred to as the lens barrel center axis Z0) of each annular member constituting the appearance of the zoom lens barrel 71, and is relative to the lens barrel center axis Z0. It is eccentric downward. Zooming is performed by moving the first lens group LG1 and the second lens group LG2 back and forth along the photographing optical axis Z1 along a predetermined locus, and focusing is performed by moving the third lens group LG3 in the same direction. In the following description, “optical axis direction” means a direction parallel to the photographing optical axis Z1 unless otherwise specified.

  As shown in FIGS. 6 and 7, a fixed ring (outer annular member) 22 is fixed in the camera body 72, and the CCD holder 21 is fixed to the rear part of the fixed ring 22. A CCD 60 is supported on the CCD holder 21 via a CCD base plate 62, and a low pass filter LG 4 is supported at the front of the CCD 60 via a filter holder 73 and a packing 61. The filter holder 73 is integrally formed as a part of the CCD holder 21. At the rear of the CCD holder 21, an LCD 20 for displaying images and shooting information is provided.

  An AF lens frame (third group lens frame) 51 that holds the third lens group LG3 is supported in the fixed ring 22 so as to be linearly movable in the optical axis direction. That is, the front end portion and the rear end portion of a pair of AF guide shafts 52 and 53 parallel to the photographing optical axis Z 1 are fixed to the fixed ring 22 and the CCD holder 21, respectively. The guide holes 51a and 51b formed in the AF lens frame 51 are slidably fitted. In this embodiment, the clearance between the AF guide shaft 53 and the guide hole 51b is larger than the clearance between the AF guide shaft 52 and the guide hole 51a. That is, the AF guide shaft 52 is a main guide shaft (giving strict accuracy), and the AF guide shaft 53 is a sub (non-rotating) guide shaft. An AF nut 54 is screwed with a feed screw formed on the drive shaft of the AF motor 160. As shown in FIG. 1, the AF nut 54 has a rotation restricting protrusion 54a, the AF lens frame 51 has a guide groove 51m in the optical axis direction, and the rotation restricting protrusion 54a is slidable with respect to the guide groove 51m. It fits in. The AF lens frame 51 further includes a stopper protrusion 51n positioned behind the AF nut 54. The AF lens frame 51 is urged forward by an AF frame urging spring 55, and the forward moving end of the AF lens frame 51 is determined by the stopper projection 51 n coming into contact with the AF nut 54. When the AF nut 54 moves rearward in the optical axis direction, the AF lens frame 51 is pressed by the AF nut 54 and moved rearward. With the above structure, when the drive shaft of the AF motor 160 is rotated forward and backward, the AF lens frame 51 is advanced and retracted in the optical axis direction. It is also possible to press the AF lens frame 51 directly (without using the AF nut 54) and move it backward against the AF frame biasing spring 55.

  As shown in FIG. 5, a zoom motor 150 and a reduction gear box 74 are supported on the upper portion of the fixed ring 22. The reduction gear box 74 has a reduction gear train inside, and transmits the driving force of the zoom motor 150 to the zoom gear 28. The zoom gear 28 is pivotally attached to the fixed ring 22 by a zoom gear shaft 29 parallel to the photographing optical axis Z1. The zoom motor 150 and the AF motor 160 are controlled by a camera control circuit 140 (FIG. 19) via a lens drive control FPC (flexible printed circuit) board 75 disposed on the outer peripheral surface of the fixed ring 22.

  On the inner peripheral surface of the fixed ring 22, a female helicoid (rotational advance / retreat mechanism) 22a, three rectilinear guide grooves 22b parallel to the photographing optical axis Z1, and three oblique grooves parallel to the female helicoid 22a (non-helicoid region) ) 22c and a rotational sliding groove (circumferential groove) 22d in the circumferential direction communicating with the front end portion of each skew groove 22c. The rotary sliding groove 22d is formed in the vicinity of the front end portion of the stationary ring 22, and the female helicoid 22a is not formed in the front annular region 22z immediately after the rotary sliding groove 22d (see FIG. 8).

  The helicoid ring (rotating ring) 18 includes a male helicoid (rotational advance / retreat mechanism) 18a that is screwed into a female helicoid (rotational advance / retreat mechanism) 22a, and a rotational sliding protrusion positioned in the skew groove 22c and the rotational sliding groove 22d. (Rotational guide protrusion) 18b is provided on the outer peripheral surface (FIGS. 4 and 9). A spur gear portion 18c having gear teeth parallel to the photographing optical axis Z1 is formed on the male helicoid 18a, and the spur gear portion 18c is screwed to the zoom gear 28. Accordingly, when a rotational force is applied from the zoom gear 28 to the spur gear portion 18c, the helicoid ring 18 advances and retreats in the optical axis direction while rotating in a state where the female helicoid 22a and the male helicoid 18a are in a screwed relationship, and to some extent forward. When moved, the male helicoid 18a is disengaged from the female helicoid 22a, and only the circumferential rotation about the lens barrel central axis Z0 is performed by the engagement relationship between the rotational sliding groove 22d and the rotational sliding protrusion 18b.

  The oblique groove 22c is a relief groove formed to avoid interference between the rotary sliding protrusion 18b and the fixed ring 22 when the female helicoid 22a and the male helicoid 18a are screwed together. As shown in FIG. The row groove 22c is deeper than the bottom of the female helicoid 22a. In the female helicoid 22a, the circumferential interval between a pair of helicoid peaks sandwiching each skew groove 22c is wider than the circumferential interval between other helicoid peaks, and the male helicoid 18a is a helicoid mountain with a wide circumferential interval. In order to engage, the three helicoid peaks 18a-W located behind the rotary sliding protrusion 18b are wider in the circumferential direction than the other helicoid peaks.

  The stationary ring 22 is further formed with a stopper insertion / removal hole (radial through hole) 22e penetrating the outer peripheral surface and the rotational sliding groove 22d, and the helicoid ring extending beyond the imaging region with respect to the stopper insertion / removal hole 22e. A disassembly stopper (stopper member) 26 for restricting the rotation of 18 is detachable.

  A rotation transmission projecting rearward from the rear end portion of the third outer cylinder (rotating ring, interlocking rotating ring) 15 with respect to the rotation transmitting recess 18 d (FIGS. 4 and 10) formed on the inner peripheral surface of the front end portion of the helicoid ring 18. The protrusion 15a (FIG. 11) is inserted. The rotation transmission recesses 18d and the rotation transmission projections 15a are provided at three positions with different positions in the circumferential direction, and the rotation transmission projections 15a and the rotation transmission recesses 18d corresponding to the circumferential positions correspond to the central axis of the lens barrel. Relative sliding in the direction along Z0 is possible and coupled in a circumferential direction around the lens barrel central axis Z0 so that relative rotation is impossible. That is, the third outer cylinder 15 and the helicoid ring 18 rotate integrally. Further, the helicoid ring 18 is formed with a fitting recess 18e by notching a partial region on the inner diameter side of the rotary sliding projection 18b, and a fitting projection (optical axis direction) that fits into the fitting recess 18e. When the rotational sliding projection 18b is engaged with the rotational sliding groove 22d, the movement restricting projection) 15b is simultaneously engaged with the rotational sliding groove 22d (see the upper half section of the lens barrel in FIG. 6).

  Between the third outer cylinder 15 and the helicoid ring 18, three separation direction biasing springs (biasing members) 25 that bias each other in the separation direction in the optical axis direction are provided. The separating-direction biasing spring 25 is a compression coil spring, and its rear end is housed in a spring insertion recess 18 f that opens at the front end of the helicoid ring 18, and its front end abuts against the spring contact recess 15 c of the third outer cylinder 15. It touches. The separation direction biasing spring 25 presses the fitting projection 15b toward the front side wall surface of the rotary sliding groove 22d and presses the rotary sliding projection 18b toward the rear side wall surface of the rotary sliding groove 22d. Thus, the backlash in the optical axis direction of the third outer cylinder 15 and the helicoid ring 18 with respect to the fixed ring 22 is removed.

  On the inner peripheral surface of the third outer cylinder 15, there are claw-like relative rotation guide protrusions 15d projecting in the inner diameter direction, a circumferential groove 15e centered on the lens barrel central axis Z0, and a photographing optical axis Z1. Three parallel roller fitting grooves 15f are formed (FIGS. 4 and 11). A plurality of relative rotation guide protrusions 15d are provided at different positions in the circumferential direction. The roller fitting groove 15f is formed at a circumferential position corresponding to the rotation transmission protrusion 15a, and a rear end portion thereof is opened rearward through the rotation transmission protrusion 15a. Further, a circumferential groove 18g centering on the lens barrel central axis Z0 is formed on the inner peripheral surface of the helicoid ring 18 (FIGS. 4 and 10). A rectilinear guide ring 14 is supported inside the combined body of the third outer cylinder 15 and the helicoid ring 18. On the outer peripheral surface of the rectilinear guide ring 14, there are three rectilinear guide protrusions 14a projecting in the outer diameter direction in order from the rear in the optical axis direction, and a plurality of claw-like relative rotation guides provided at different positions in the circumferential direction. A protrusion 14b, a relative rotation guide protrusion 14c, and a circumferential groove 14d centering on the lens barrel center axis Z0 are formed (FIGS. 4 and 12). The rectilinear guide ring 14 is guided linearly in the optical axis direction with respect to the fixed ring 22 by engaging the rectilinear guide protrusion 14a with the rectilinear guide groove 22b. In addition, the third outer cylinder 15 has a circumferential groove 15e engaged with the relative rotation guide protrusion 14c and a relative rotation guide protrusion 15d engaged with the circumferential groove 14d, so that the third outer cylinder 15 is relative to the rectilinear guide ring 14. It is coupled to be rotatable. The circumferential groove 15e and the relative rotation guide projection 14c, and the circumferential groove 14d and the relative rotation guide projection 15d are loosely fitted so as to be slightly movable in the optical axis direction. Further, the helicoid ring 18 is also coupled to the linear guide ring 14 so as to be relatively rotatable by engaging the circumferential groove 18g with the relative rotation guide protrusion 14b. The circumferential groove 18g and the relative rotation guide protrusion 14b are loosely fitted so as to be relatively movable in the optical axis direction.

  The linear guide ring 14 is formed with three roller guide through grooves 14e penetrating the inner peripheral surface and the outer peripheral surface. As shown in FIG. 12, each roller guide through-groove 14e has circumferential front and rear circumferential groove portions 14e-1 and 14e-2 formed in the circumferential direction, and both circumferential groove portions 14e-1 and 14e-2. And a lead groove 14e-3 for connecting the two. A cam ring roller 32 provided on the outer peripheral surface of the cam ring 11 is fitted into each roller guide through groove 14e. The cam ring roller 32 is fixed to the cam ring 11 via a roller fixing screw 32a, and is provided with three different positions in the circumferential direction. The cam ring roller 32 further passes through the roller guide through groove 14e and is fitted into the roller fitting groove 15f on the inner peripheral surface of the third outer cylinder 15. Three roller pressing pieces 17a provided on the roller biasing spring 17 are fitted in the vicinity of the front end portion of each roller fitting groove 15f (FIG. 11). When the cam ring roller 32 engages with the circumferential groove portion 14e-1, the roller pressing piece 17a abuts against the cam ring roller 32 and presses backward, and the cam ring roller 32 and the roller guide through groove 14e (circumferential direction) Take backlash with the groove 14e-1).

  From the above structure, the mode of extension from the fixed ring 22 to the cam ring 11 is understood. In other words, when the zoom gear 28 is rotationally driven in the lens barrel feeding direction by the zoom motor 150, the helicoid ring 18 is fed forward while rotating due to the relationship between the female helicoid 22a and the male helicoid 18a. The helicoid ring 18 and the third outer cylinder 15 are rotatable and rotatable relative to the linear guide ring 14 by the engagement relationship between the circumferential grooves 14d, 15e and 18g and the relative rotation guide protrusions 15d, 14c and 14b, respectively. Since they are coupled so as to move in the axial direction (the direction along the lens barrel central axis Z0), when the helicoid ring 18 is rotated out, the third outer cylinder 15 is also extended forward while rotating in the same direction. Accordingly, the rectilinear guide ring 14 moves straight forward together with the helicoid ring 18 and the third outer cylinder 15. Further, the rotational force of the third outer cylinder 15 is transmitted to the cam ring 11 via the roller fitting groove 15 f and the cam ring roller 32. Since the cam ring roller 32 is also fitted in the roller guide through groove 14e, the cam ring 11 is extended forward with respect to the linear guide ring 14 while rotating according to the shape of the lead groove 14e-3. As described above, the rectilinear guide ring 14 itself also moves straight forward together with the third outer cylinder 15 and the helicoid ring 18, and as a result, the cam ring 11 has a rotational advance according to the lead groove portion 14 e-3 and a rectilinear guide. An amount of movement in the optical axis direction is added to the amount of linear movement of the ring 14 forward.

  The above-described feeding operation is performed while the male helicoid 18a and the female helicoid 22a are screwed together. At this time, the rotary sliding protrusion 18b moves in the oblique groove 22c. When the helicoid ring 18 and the third outer cylinder 15 are fed out by a predetermined amount, the screw engagement between the male helicoid 18a and the female helicoid 22a is released, and the rotational sliding protrusion 18b and the fitting protrusion 15b eventually rotate from the oblique groove 22c. It enters into the moving groove 22d. Then, since the rotation output by the helicoid does not act, the helicoid ring 18 and the third outer cylinder 15 are arranged in the optical axis direction by the engagement relationship between the rotation sliding projection 18b and the fitting projection 15b and the rotation sliding groove 22d. Only rotation is performed at a fixed position. The cam ring roller 32 enters the circumferential groove 14e-1 of the roller guide through groove 14e almost simultaneously with the rotation sliding protrusion 18b entering the rotation sliding groove 22d from the skew groove 22c. Then, no forward moving force is applied to the cam ring 11, and the cam ring 11 only rotates at a fixed position according to the rotation of the third outer cylinder 15.

  When the zoom gear 28 is rotationally driven in the lens barrel storage direction, the reverse operation is performed. When the helicoid ring 18 is rotated until the cam ring roller 32 enters the circumferential groove portion 14e-2 of the roller guide through groove 14e, each of the above-described lens barrel members retracts to the position shown in FIG.

  Subsequently, the structure ahead of the cam ring 11 will be described. On the inner peripheral surface of the rectilinear guide ring 14, three first rectilinear guide grooves 14f and six second rectilinear guide grooves 14g parallel to the photographing optical axis Z1 are formed in different positions in the circumferential direction. . The first rectilinear guide groove 14f is composed of a pair of grooves located on both sides of the three second rectilinear guide grooves 14g out of the six, and the second group rectilinear guide ring 10 is in relation to the three first rectilinear guide grooves 14f. Three crotch-shaped projections 10a (FIGS. 3 and 15) provided in the slidably engage with each other. On the other hand, six rectilinear guide protrusions 13a (FIGS. 2 and 17) projecting from the outer peripheral surface of the rear end portion of the second outer cylinder 13 are slidably engaged with the second rectilinear guide groove 14g. Yes. Therefore, both the second outer cylinder 13 and the second group rectilinear guide ring 10 are guided in the straight direction in the optical axis direction via the rectilinear guide ring 14.

  The second group rectilinear guide ring 10 is a member for linearly guiding the second group lens moving frame 8 that supports the second lens group LG2, and the second outer cylinder 13 is a first outer member that supports the first lens group LG1. It is a member for guiding the cylinder 12 straightly.

  First, the support structure of the second lens group LG2 will be described. The second group rectilinear guide ring 10 has three rectilinear guide keys 10c projecting forward from a ring portion 10b connecting the three crotch protrusions 10a (FIGS. 3 and 15). As shown in FIGS. 6 and 7, the outer edge portion of the ring portion 10b can rotate relative to the circumferential groove 11e formed on the inner peripheral surface of the rear end portion of the cam ring 11, and cannot move relative to the optical axis. The linear guide key 10 c is engaged and extends inside the cam ring 11. Each rectilinear guide key 10c has a pair of guide surfaces parallel to the photographic optical axis Z1 on its side surface, and these guide surfaces are rectilinear guide grooves of the second group lens moving frame 8 supported inside the cam ring 11. By engaging with 8a, the second group lens moving frame 8 is guided straight in the axial direction. The rectilinear guide groove 8 a is formed on the outer peripheral surface side of the second group lens moving frame 8.

  The second group rectilinear guide ring 10 is provided with three rectilinear guide keys 10c having different positions in the circumferential direction. One of the rectilinear guide keys 10c-W is an FPC (exposure control FPC) (to be described later). Flexible printed circuit) In order to serve also as a supporting member for the substrate 77, the width is wider in the circumferential direction than the remaining two linear guide keys 10c. The wide rectilinear guide key 10c-W is formed with an FPC through hole 10d penetrating in the radial direction by partially notching the vicinity of the connection portion with the ring portion 10b. As shown in FIG. The substrate 77 extends from the rear of the ring portion 10b to the outer peripheral surface side of the linear guide key 10c-W through the FPC through hole 10d, and is bent backward at the tip of the linear guide key 10c-W. Correspondingly, one of the three rectilinear guide grooves 8a is a wide rectilinear guide groove 8a-W with which a wide rectilinear guide key 10c-W can be engaged. The central portion of the rectilinear guide groove 8a-W is a penetrating portion through which the exposure control FPC board 77 can pass, and a bottomed portion for supporting the rectilinear guide key 10c-W is provided on both sides of the penetrating portion. Is formed. On the other hand, the remaining two rectilinear guide grooves 8 a are bottomed grooves formed on the outer peripheral surface side of the second group lens moving frame 8. The second group lens moving frame 8 and the second group rectilinear guide ring 10 can be combined only at a specific rotational phase in which the rectilinear guide key 10c-W can be engaged with the rectilinear guide groove 8a-W.

  A second group guide cam groove 11 a is formed on the inner peripheral surface of the cam ring 11. As shown in FIG. 14, the second group guide cam groove 11a is composed of a front cam groove 11a-1 and a rear cam groove 11a-2 whose positions are different in the optical axis direction and the circumferential direction. Both the front cam groove 11a-1 and the rear cam groove 11a-2 are cam grooves formed by tracing the basic trajectory α of the same shape, but each does not cover the entire area of the basic trajectory α. The front cam groove 11a-1 and the rear cam groove 11a-2 are different from each other in the area occupied on the basic locus α. The basic trajectory is a conceptual cam groove shape including all lens barrel use areas (use areas) including a zoom area and a storage area, and an assembly / disassembly area of the lens barrel. In other words, the lens barrel use area is an area in which the movement of the second group lens moving frame 8 can be controlled by the cam groove shape, and is used to distinguish from the assembly / disassembly area. The zoom area is an area for controlling the movement between the wide end and the tele end in the lens barrel use area, and is used to distinguish it from the storage area. When the cam ring 11 includes a pair of the front cam groove 11a-1 and the rear cam groove 11a-2, three groups of two-group guide cam grooves 11a are formed at equal intervals in the circumferential direction.

  A second group cam follower 8b provided on the outer peripheral surface of the second group lens moving frame 8 is engaged with the second group guide cam groove 11a. Similar to the second group guide cam groove 11a, the second group cam follower 8b is also equally spaced in the circumferential direction with a pair of front cam follower 8b-1 and rear cam follower 8b-2 having different positions in the optical axis direction and circumferential direction as one group. The front cam followers 8b-1 are engaged with the front cam grooves 11a-1, and the rear cam followers 8b-2 are engaged with the rear cam grooves 11a-2 in the optical axis direction. A circumferential interval is defined.

  Since the second group lens moving frame 8 is linearly guided in the optical axis direction via the second group linear guide ring 10, when the cam ring 11 rotates, the second group lens moving frame 8 becomes light according to the second group guide cam groove 11a. Move in the axial direction with a predetermined trajectory.

  Inside the second group lens moving frame 8, a second group lens frame 6 holding the second lens group LG2 is supported. The second group lens frame 6 is pivotally supported via a second group rotation shaft 33 with respect to a pair of second group lens frame support plates 36 and 37, and the second group frame support plates 36 and 37 are supported by a support plate fixing screw 66. Is fixed to the second group lens moving frame 8. The second group rotation shaft 33 is parallel to the photographing optical axis Z1 and is eccentric with respect to the photographing optical axis Z1, and the second group lens frame 6 has the second group rotation shaft 33 as the rotation center, and the second lens group LG2. And a retracting position for storage (FIG. 6) for displacing the optical axis of the second lens group LG2 from the photographing optical axis Z1 to the retracting optical axis Z2. 7). The second group lens moving frame 8 is provided with a rotation restricting pin 35 that restricts the second group lens frame 6 from rotating at the photographing position. The second group lens frame 6 is moved by a second group lens frame return spring 39. It is urged to rotate in the contact direction with the rotation regulating pin 35. The axial pressing spring 38 performs backlash removal in the optical axis direction of the second group lens frame 6.

  The second group lens frame 6 moves integrally with the second group lens moving frame 8 in the optical axis direction. The CCD holder 21 has a cam projection 21a (FIG. 4) projecting forward at a position engageable with the second group lens frame 6, and the second group lens moving frame 8 is arranged in the storing direction as shown in FIG. When it moves and approaches the CCD holder 21, the cam surface formed at the tip of the cam projection 21a engages with the second group lens frame 6 and rotates to the above retracted position.

  Next, a support structure for the first lens group LG1 will be described. Three rectilinear guide grooves 13b are formed in the optical axis direction on the inner peripheral surface of the second outer cylinder 13 that is guided linearly in the optical axis direction via the rectilinear guide ring 14. In addition, three engagement protrusions 12a formed on the outer peripheral surface near the rear end portion of the first outer cylinder 12 are slidably fitted in each of the straight guide grooves 13b (FIGS. 2, 17, and 18). reference). That is, the first outer cylinder 12 is guided in a straight line in the optical axis direction via the straight guide ring 14 and the second outer cylinder 13. The second outer cylinder 13 has an inner diameter flange 13 c directed in the circumferential direction on the inner peripheral surface near the rear end portion, and the inner diameter flange 13 c slides in a circumferential groove 11 c provided on the outer peripheral surface of the cam ring 11. By engaging with each other, the second outer cylinder 13 is coupled to the cam ring 11 so as to be rotatable relative to the cam ring 11 but not movable relative to the optical axis. On the other hand, the first outer cylinder 12 has three first group rollers (cam followers) 31 projecting in the inner diameter direction, and each of the first group rollers 31 is formed on the outer peripheral surface of the cam ring 11. The guide cam groove 11b is slidably fitted.

  The first group lens frame 1 is supported in the first outer cylinder 12 via the first group adjustment ring 2. The first lens group LG1 is fixed to the first group lens frame 1, and the male adjustment screw 1a formed on the outer peripheral surface thereof is screwed with the female adjustment screw 2a formed on the inner peripheral surface of the first group adjustment ring 2. . By adjusting the screwing position of the adjusting screw, the position of the first group lens frame 1 can be adjusted in the optical axis direction with respect to the first group adjusting ring 2.

  The first group adjusting ring 2 has a pair of guide protrusions 2b (only one is shown in FIG. 2) protruding in the outer diameter direction, and the pair of guide protrusions 2b is on the inner peripheral surface side of the first outer cylinder 12. Are slidably engaged with a pair of first-group adjustment ring guide grooves 12b. The first group adjustment ring guide groove 12b is formed in parallel with the photographic optical axis Z1, and the first group adjustment ring 2 and the first group lens frame 1 are arranged according to the engagement relationship between the first group adjustment ring guide groove 12b and the guide projection 2b. The combined body can be moved back and forth in the optical axis direction with respect to the first outer cylinder 12. Further, the first group retaining ring 3 is fixed to the first outer cylinder 12 by a retaining ring fixing screw 64 so as to block the front of the guide protrusion 2b. Between the spring receiving portion 3a of the first group retaining ring 3 and the guide projection 2b, a first group biasing spring 24 made of a compression coil spring is provided, and the first group adjusting ring 2 causes the first group adjusting ring 2 to light. It is biased axially rearward. The first group adjusting ring 2 is engaged with the front surface of the first group retaining ring 3 (the surface on the side visible in FIG. 2) by engaging an engaging claw 2c projecting on the outer peripheral surface near the front end thereof. The maximum position of the rearward movement in the optical axis direction relative to the outer cylinder 12 is regulated (see the upper half section in FIG. 6). On the other hand, by compressing the first group biasing spring 24, the first group adjusting ring 2 can move a little forward in the optical axis direction.

  A shutter unit 76 having a shutter S and an aperture A is supported between the first lens group LG1 and the second lens group LG2. The shutter unit 76 is supported on the inner side of the second group lens moving frame 8, and the air distance between the shutter S and the aperture stop A between the second lens group LG2 is fixed. Two actuators 131 and 132 (FIG. 19) for driving the shutter S and the diaphragm A are arranged one by one at the front and rear positions with the shutter unit 76 interposed therebetween. An exposure control FPC board 77 for connecting to the control circuit 140 is extended. Note that the exposure control FPC board 77 does not actually exist at the position of the lower half section (wide end) in FIG. 6, but is shown for easy understanding of the positional relationship with other members.

  In addition to the shutter S, a lens barrier mechanism is provided at the front end of the first outer cylinder 12 to close the photographing aperture and protect the photographing optical system (first lens group LG1) when not photographing. The lens barrier mechanism includes a pair of barrier blades 104 and 105 that are rotatable about a rotation shaft provided at a position eccentric with respect to the lens barrel central axis Z0, and urges the barrier blades 104 and 105 in the closing direction. A pair of barrier urging springs 106, a barrier drive ring 103 that can be rotated about the central axis Z0 of the barrel, and engage with the barrier blades 104 and 105 by rotation in a predetermined direction, and the barrier drive ring 103 A barrier drive ring biasing spring 107 that biases 103 in the barrier opening direction and a barrier pressing plate 102 positioned between the barrier blades 104 and 105 and the barrier drive ring 103 are provided. The urging force of the barrier drive ring urging spring 107 is set to be stronger than the urging force of the barrier urging spring 106, and when the zoom lens barrel 71 is extended to the zoom region (FIG. 6), the barrier driving ring is attached. The biasing spring 107 holds the barrier driving ring 103 at the angular position for opening the barrier, and the barrier blades 104 and 105 are opened against the barrier biasing spring 106. During the movement of the zoom lens barrel 71 from the zoom region to the storage position (FIG. 7), the barrier drive ring pressing surface 11d (FIGS. 3 and 13) of the cam ring 11 opposes the barrier drive ring 103 in the barrier opening direction. The barrier driving ring 103 is disengaged from the barrier blades 104 and 105, and the barrier blades 104 and 105 are closed by the biasing force of the barrier biasing spring 106. The front part of the lens barrier mechanism is covered with a barrier cover 101 (decorative plate).

  The overall feeding and storing operation of the zoom lens barrel 71 having the above structure will be described with reference to FIGS. FIG. 19 conceptually shows the relationship between the main members of the zoom lens barrel 71. “S” in parentheses after the reference numeral of each member is a fixed member, and “L” is in the optical axis direction. A member that performs only linear movement, “R” indicates a member that performs only rotation, and “RL” indicates a member that moves in the optical axis direction while rotating. Moreover, the member in which two symbols are written in parentheses means that the operation mode is switched during feeding and storage.

  Since the cam ring 11 has already been described up to the stage where the cam ring 11 is extended from the storage position to the fixed position rotation state, a brief description will be given. 7, the zoom lens barrel 71 is completely stored in the camera body 72, and the front surface of the camera 70 is flat so that the zoom lens barrel 71 does not protrude from the camera body 72. Yes. When the zoom gear 28 is driven to rotate in the extending direction by the zoom motor 150 from the lens barrel storage state, the combined body of the helicoid ring 18 and the third outer cylinder 15 is rotated and extended according to the helicoid (male helicoid 18a, female helicoid 22a). The straight guide ring 14 moves straight forward together with the third outer cylinder 15 and the helicoid ring 18. At this time, the cam ring 11 to which the rotational force is applied by the third outer cylinder 15 is a lead structure (cam ring roller) provided between the linear movement of the linear guide ring 14 and the linear guide ring 14. 32, the combined movement with the feeding portion by the lead groove 14e-3) is performed. When the helicoid ring 18 and the cam ring 11 are drawn out to a predetermined position in front, the functions of the respective rotary feeding structures (helicoid, lead) are canceled and only the circumferential rotation about the lens barrel central axis Z0 is performed. become.

  When the cam ring 11 rotates, on the inner side, the second group lens moving frame 8 guided linearly through the second group linear guide ring 10 is in the optical axis direction due to the relationship between the second group cam follower 8b and the second group guide cam groove 11a. Is moved along a predetermined trajectory. 7, the second group lens frame 6 in the second group lens moving frame 8 is stored in the retracted position for decentering upward from the photographing optical axis Z1 by the action of the cam projection 21a protruding from the CCD holder 21. The second lens group LG2 was at the retracted optical axis Z2 position. The second group lens frame 6 is separated from the cam projection 21a while the second group lens moving frame 8 is extended to the zoom region, and the optical axis of the second lens group LG2 is adjusted by the urging force of the second group lens frame return spring 39. It is rotated to a photographing position (FIG. 6) that coincides with the photographing optical axis Z1. Thereafter, the second group lens frame 6 is held at the photographing position until the zoom lens barrel 71 is moved again to the storage position.

  Further, when the cam ring 11 rotates, the first outer cylinder 12 guided linearly through the second outer cylinder 13 on the outside of the cam ring 11 is related to the first group roller 31 and the first group guide cam groove 11b. Is moved along a predetermined locus in the optical axis direction.

  That is, the first lens group LG1 and the second lens group LG2 are extended with respect to the imaging surface (CCD light receiving surface), respectively, with the former moving amount of the cam ring 11 with respect to the fixed ring 22 and the first moving position with respect to the cam ring 11. It is determined as a sum of the cam feed amount of the outer cylinder 12 and the latter is a sum of the amount of forward movement of the cam ring 11 relative to the fixed ring 22 and the cam feed amount of the second group lens moving frame 8 relative to the cam ring 11. Determined. Zooming is performed by moving the first lens group LG1 and the second lens group LG2 on the photographing optical axis Z1 while changing the air interval between them. When the lens barrel is extended from the storage position of FIG. 7, first, the wide end extended state shown in the lower half cross section of FIG. 6 is obtained, and when the zoom motor 150 is further driven in the lens barrel extending direction, the upper half cross section of FIG. As shown in FIG. As can be seen from FIG. 6, in the zoom lens barrel 71 of the present embodiment, the distance between the first lens group LG1 and the second lens group LG2 is large at the wide end, and the first lens group LG1 and the second lens at the tele end. The group LG2 moves in the direction of mutual approach, and the interval is reduced. Such a change in the air gap between the first lens group LG1 and the second lens group LG2 is given by the locus of the second group guide cam groove 11a and the first group guide cam groove 11b. In the zoom region (zooming use region) between the tele end and the wide end, the cam ring 11, the third outer cylinder 15, and the helicoid ring 18 perform only the above-mentioned fixed position rotation and do not advance or retreat in the optical axis direction.

  In the zoom region, by driving the AF motor 160 according to the subject distance, the third lens group LG3 (AF lens frame 51) moves along the photographing optical axis Z1 to perform focusing.

  When the zoom motor 150 is driven in the lens barrel storage direction, the zoom lens barrel 71 performs a storage operation opposite to that at the time of the above-described extension, so that the storage position is completely stored in the camera body 72 (FIG. 7). Moved to. In the middle of the movement to the storage position, the second group lens frame 6 is rotated to the storage retreat position by the cam projection 21 a and retracts together with the second group lens movement frame 8. When the zoom lens barrel 71 is moved to the storage position, the second lens group LG2 is stored at the same position as the third lens group LG3 and the low-pass filter LG4 in the optical axis direction (overlapping in the radial direction of the lens barrel). . Due to the retracting structure of the second lens group LG2 during storage, the storage length of the zoom lens barrel 71 is shortened, and the thickness of the camera body 72 in the left-right direction in FIG. 7 can be reduced.

  The digital camera 70 includes a zoom finder that is linked to the zoom lens barrel 71. The zoom finder meshes the finder gear 30 with the spar gear portion 18c to obtain power from the helicoid ring 18. When the helicoid ring 18 rotates at the above-mentioned fixed position in the zoom region, the finder gear receives the rotational force. 30 rotates. The finder optical system includes an objective window 81a, a first movable variable lens 81b, a second movable variable lens 81c, a prism 81d, an eyepiece lens 81e, and an eyepiece window 81f, and first and second movable variable magnifications. Zooming is performed by moving the lenses 81b and 81c along a predetermined locus along the optical axis Z3 of the finder objective system. The optical axis Z3 of the finder objective system is parallel to the photographing optical axis Z1. The holding frames 83 and 84 of the movable zoom lenses 81b and 81c are guided in a straight line so as to be movable in the direction of the optical axis Z3 by guide shafts 85 and 86 (which appear to be overlapped in FIGS. 6 and 7), and A moving force is applied by a cam gear 90 (FIG. 5) that can be rotated about a rotation center axis parallel to the optical axis Z3. A reduction gear train is provided between the cam gear 90 and the finder gear 30. When the finder gear 30 rotates, the cam gear 90 is rotated, and as a result, the movable variable magnification lenses 81b and 81c advance and retract. The above components of the zoom finder are sub-assembled as a finder unit 80 shown in FIG.

[Description of Features of the Present Invention]
As described above, in the zoom lens barrel 71, the helicoid ring 18, the third outer cylinder 15, and the cam ring 11 are moved forward from the lens barrel storage state in FIG. 7 to the middle of the use state (zoom region) in FIG. 6. In the state of use, the helicoid ring 18, the third outer cylinder 15, and the cam ring 11 are rotated at a fixed position without being moved in the optical axis direction.

  As described above, the third outer cylinder 15 and the helicoid ring 18 are coupled so as to rotate integrally in the rotation direction by engaging the rotation transmission protrusion 15a with the rotation transmission recess 18d, and the rotation transmission protrusion 15a. At the same time, the fitting projection 15b is fitted into the fitting recess 18e formed in the inner diameter portion of the rotary sliding projection 18b (see FIGS. 34 and 35). In the rotational phase of the third outer cylinder 15 and the helicoid ring 18 in which the rotation transmitting projection 15a and the fitting projection 15b engage with the rotation transmitting recess 18d and the fitting recess 18e, respectively, a spring insertion recess formed at the front end of the helicoid ring 18 The separation-direction biasing spring 25 housed in 18 f is positioned corresponding to the spring contact recess 15 c at the rear end of the third outer cylinder 15.

  The helicoid ring 18 and the third outer cylinder 15 are also rotatable relative to the rectilinear guide ring 14 due to the fitting relationship between the relative rotation guide protrusions 14b, 14c and 15d and the circumferential grooves 18g, 15e and 14d. Is bound to. As shown in FIGS. 30 to 33, each of the relative rotation guide projections 14b, 14c and 15d and each of the circumferential grooves 18g, 15e and 14d are loosely fitted so as to be relatively movable in the optical axis direction. Each of the ring 18 and the third outer cylinder 15 can be moved a little in the optical axis direction with respect to the rectilinear guide ring 14. That is, the helicoid ring 18 and the third outer cylinder 15 are restricted from being completely divided in the optical axis direction via the linear guide ring 14, but at the same time, a slight amount of relative movement in the optical axis direction is possible. It has become. The play amount (clearance) in the optical axis direction with respect to the linear guide ring 14 is larger on the helicoid ring 18 side than on the third outer cylinder 15 side.

  When the third outer cylinder 15 and the helicoid ring 18 are coupled to the rectilinear guide ring 14 so as to be rotatable relative to each other, the distance between the spring contact recess 15c and the spring insertion recess 18f in the optical axis direction is free of the separation direction biasing spring 25. The spacing direction biasing spring 25 is narrower than the length, and is held between the opposed end surfaces of the third outer cylinder 15 and the helicoid ring 18 in a compressed state. The compressed separation direction biasing spring 25 causes the third outer cylinder 15 and the helicoid ring 18 to move away from each other, that is, the third outer cylinder 15 is forward in the optical axis direction, and the helicoid ring 18 is rearward in the optical axis direction. Energize to.

  As shown in FIGS. 24 to 28, the three oblique grooves 22c formed on the inner peripheral surface of the fixed ring 22 are each a pair of opposed oblique surfaces 22c-A and 22c-B that are opposed to each other in the circumferential direction. The three rotary sliding protrusions 18b of the helicoid ring 18 have a pair of end slopes 18b-A and 18b-B that face the opposing oblique surfaces 22c-A and 22c-B, respectively. Opposing oblique surfaces 22c-A and 22c-B of the oblique groove 22c are formed in a direction parallel to the helicoid mountain of the female helicoid 22a, and end inclined surfaces 18b-A and 18b of the rotational sliding protrusion 18b. -B has a shape that does not interfere with the opposing oblique surfaces 22c-A and 22c-B. Specifically, as shown in FIG. 28, when the male helicoid 18a and the female helicoid 22a are screwed together, the opposing oblique surfaces 22c-A and 22c-B of the oblique groove 22c are the end portions of the rotational sliding protrusion 18b. The slopes 18b-A and 18b-B are not sandwiched (engaged). In order to make only one rotary sliding protrusion 18b contact the disassembly stopper 26, a part of the end slope 18b-A is cut out to form a stopper contact surface 18b-E parallel to the optical axis. ing.

  Each of the three rotation sliding grooves 22d following each skew groove 22c has a pair of parallel rotation guide surfaces (opposing wall surfaces) 22d-A and 22d-B that are spaced apart from each other in the optical axis direction, and have a helicoid ring. The three rotation sliding protrusions 18b on the 18 side respectively have a front sliding surface 18b-C and a rear sliding surface 18b-D that can be slidably contacted with the rotation guide surfaces 22d-A and 22d-B. As shown in FIG. 36, the fitting recess 18e that accommodates the fitting protrusion 15b is formed by partially cutting the front sliding surface 18b-C side of each rotating sliding protrusion 18b. Further, the front surface of the fitting projection 15b is a sliding contact surface 15b-A that faces the rotation guide surface 22d-A in a state where the fitting projection 15b is housed in the fitting recess 18e.

  20 and 24, the rotational sliding protrusion 18b of the helicoid ring 18 is located in the oblique groove 22c of the stationary ring 22, and the end slopes 18b-A and 18b-B are respectively provided. Opposite oblique surfaces 22c-A and 22c-B are opposed to each other in a slightly spaced state. In the lens barrel storage state, the male helicoid 18a and the female helicoid 22a are in a screwed state. Therefore, when rotation in the lens barrel feeding direction (upward in FIG. 20) is applied to the helicoid ring 18 by the zoom gear 28 meshing with the spur gear portion 18c, the helicoid ring 18 is moved forward in the optical axis direction due to the relationship between the male helicoid 18a and the female helicoid 22a. Move to the left of the figure. When the helicoid ring 18 is rotated, the rotary sliding protrusion 18b moves in the skew groove 22c, so that the rotary sliding protrusion 18b does not interfere with the female helicoid 22a of the stationary ring 22.

  When the rotary sliding protrusion 18b is positioned in the skew groove 22c, the position of the fitting protrusion 15b in the optical axis direction is not restricted by the skew groove 22c. Further, in the rotational sliding protrusion 18b, the opposing oblique surfaces 22c-A and 22c-B are opposed to the opposing oblique surfaces 22c-A and 22c-B of the oblique groove 22c, but the forward sliding surface 18b- C and the rear sliding surface 18b-D are not subjected to position restriction in the optical axis direction by the skew groove 22c. Therefore, the third outer cylinder 15 and the helicoid ring 18 urged in the separation direction by the urging force of the separation direction urging spring 25 have the above-described relative rotation guide protrusions as shown in FIGS. 32 and 33. (14b, 14c and 15d) are slightly separated in the optical axis direction according to the clearance between the circumferential grooves (18g, 15e and 14d). In this state, since the compression force of the separation direction biasing spring 25 is low, the biasing action is weak, and the distance between the third outer cylinder 15 and the helicoid ring 18 in the optical axis direction is kept relatively loose. While the moving projection 18b is positioned in the oblique groove 22c, there is no practical problem because no shooting is performed in the middle from the storage position to the shooting state (zoom region). Rather, in the zoom lens barrel of a compact camera, the lens barrel is in the retracted state, including when the power is turned off, as compared to the shooting state (longer in time). As in the case of the spring 25, it is preferable that a strong load is not applied except in a photographing state, since there is less risk of deterioration over time. In addition, the resistance at the time of feeding from the storage position to the photographing state can be kept small.

  When the helicoid ring 18 moves forward in the optical axis direction, the rectilinear guide ring 14 is also moved forward together with the helicoid ring 18 in the optical axis direction due to the engagement relationship between the circumferential groove 18g and the relative rotation guide projection 14b. A forward movement is also given to the cam ring 11 which is supported by. Further, the rotational force of the helicoid ring 18 is transmitted to the cam ring 11 via the third outer cylinder 15, and the cam ring 11 depends on the relationship between the lead groove portion 14e-3 of the roller guide through groove 14e and the cam ring roller 32. The linear guide ring 14 is fed forward in the optical axis direction. Further, when the cam ring 11 is rotated, the first lens group LG1 and the second lens group LG2 are moved along the optical axis along a predetermined locus in accordance with the first group guide cam groove 11b and the second group guide cam groove 11a formed in the cam ring 11. Move relative.

  When the rotational sliding projection 18b moves to the forefront portion of the skew groove 22c, the rotational slide protrusion 18b is detached from the skew groove 22c and enters the rotational sliding groove 22d. The male helicoid 18a and the female helicoid 22a have a formation region in the optical axis direction so as to release the mutual screwing at this time. Specifically, on the inner peripheral surface of the fixed ring 22, the region where the rotational sliding groove 22d is formed and the front annular region 22z behind it do not have the female helicoid 22a, and the optical axis direction of the front annular region 22z Is set so as to be larger than the formation region of the male helicoid 18a in the optical axis direction. On the other hand, on the outer peripheral surface of the helicoid ring 18, when the rotary sliding protrusion 18b is engaged with the rotary sliding groove 22d, the rear male helicoid 18a is positioned (overlapped) in the front annular region 22z. The distance between the male helicoid 18a and the rotary sliding protrusion 18b in the optical axis direction is determined. Therefore, when the rotating / sliding protrusion 18b engages with the rotating / sliding groove 22d, the male helicoid 18a and the female helicoid 22a are unscrewed, and a repetitive output in the optical axis direction acts on the rotating helicoid ring 18. No longer. Thereafter, the helicoid ring 18 only rotates in the circumferential direction in accordance with the rotation of the zoom gear 28 in the lens barrel feeding direction. As shown in FIG. 21, the zoom gear 28 maintains meshing with the spar gear portion 18c even after the helicoid ring 18 is rotated to a fixed position, and continuously rotates the helicoid ring 18 when the rotation is extended. Can do.

  The state shown in FIGS. 21 and 25 in which the helicoid ring 18 rotates at a fixed position and the rotational sliding protrusion 18b slightly advances in the rotational sliding groove 22d is the wide end of the zoom lens barrel 71. As shown in FIG. 25, at the wide end, the parallel front sliding surface 18b-C and the rear sliding surface 18b-D forming the front and rear ends of the rotary sliding protrusion 18b are rotated in the front and rear directions of the rotary sliding groove 22d. Since the helicoid ring 18 is sandwiched between the guide surfaces 22d-A and 22d-B, the movement of the helicoid ring 18 in the optical axis direction is restricted.

  In addition, as shown in FIG. 30, when the rotary slide protrusion 18b moves into the rotary slide groove 22d, the fitting protrusion 15b at the same circumferential position as the rotary slide protrusion 18b also simultaneously enters the rotary slide groove 22d. The sliding contact surface 15b-A of the fitting projection 15b is pressed against the front rotation guide surface 22d-A by the biasing force of the separating direction biasing spring 25, and the rear sliding surface 18b- of the rotation sliding projection 18b. D is pressed against the rear rotation guide surface 22d-B. The distance in the optical axis direction between the rotation guide surfaces 22d-A and 22d-B before and after the rotation sliding groove 22d is larger than that when the rotation sliding protrusion 18b and the fitting protrusion 15b are located in the skew groove 22c. The sliding projection 18b and the fitting projection 15b are set so as to be forcibly approached in the optical axis direction. Accordingly, the degree of compression of the separating direction biasing spring 25 is increased, and the fitting projection 15b and the sliding slide are rotated. A stronger biasing force is applied to the protrusion 18b than when the lens barrel is stored. Thereafter, while both the rotational sliding projection 18b and the fitting projection 15b are engaged with the rotational sliding groove 22d, the fitting projection 15b and the rotational sliding projection 18b are pushed against each other by the biasing force of the separation direction biasing spring 25. Thus, the positions of the third lens barrel 15 and the helicoid ring 18 relative to the stationary ring 22 are stabilized. That is, it is supported without any play in the optical axis direction.

  When the combined body of the third outer cylinder 15 and the helicoid ring 18 is rotated in the feeding direction from the wide end, the fitting projection 15b (sliding contact surface 15b-A) and the rotating sliding projection 18b (rear sliding surface 18b-D) Receive the guidance of the rotation guide surfaces 22d-A and 22d-B with which they abut, respectively, and move toward the end of the rotation sliding groove 22d, and eventually reach the tele end position shown in FIGS. Between the wide end and the tele end, the engagement of the fitting protrusion 15b, the rotation sliding protrusion 18b, and the rotation sliding groove 22d is maintained, so that the helicoid ring 18 and the third outer cylinder 15 are in contact with the fixed ring 22. Movement in the optical axis direction is restricted and only rotation is performed. As shown in FIG. 29, the helicoid ring 18 is urged by the separation direction urging spring 25 in the rear direction in the optical axis, that is, in the direction in which the rear sliding surface 18b-D comes into contact with the rotation guide surface 22d-B. Therefore, the rotation guide of the helicoid ring 18 is mainly performed by the sliding contact relationship between the rear sliding surface 18b-D and the rotation guide surface 22d-B.

  When the helicoid ring 18 rotates at a fixed position, the cam ring roller 32 is positioned in the circumferential groove 14e-1 of the roller guide through groove 14e, so that the cam ring 11 is also in the optical axis direction with respect to the rectilinear guide ring 14. Rotate in place without moving. That is, the first lens group LG1 and the second lens group LG2 are relatively moved in the optical axis direction along a predetermined locus according to the zoom areas of the second group guide cam groove 11a and the first group guide cam groove 11b, and zooming is performed.

    The third outer cylinder 15 and the helicoid ring 18 are further rotated in the feeding direction from the telephoto end, and the rotational sliding projection 18b reaches the end portion (disassembly region) of the rotational sliding groove 22d as shown in FIGS. Then, the third outer cylinder 15, the second outer cylinder 13, the first outer cylinder 12, and the like are in a lens barrel disassembly state in which the fixed ring 22 can be extracted forward. However, when the disassembly stopper 26 is attached to the fixed ring 22, the stopper abutment surface 18b-E of one rotary sliding protrusion 18b abuts on the disassembly stopper 26 and the rotation to the disassembly position is restricted. Therefore, the lens barrel cannot be disassembled unless the disassembly stopper 26 is removed. This decomposition structure will be described later.

  When the third outer cylinder 15 and the helicoid ring 18 are rotated from the telephoto end in the lens barrel storage direction (downward in FIG. 22), the rotational sliding projection 18b and the fitting projection 15b are inclined in the rotational sliding groove 22d. It moves in the direction approaching 22c. During this time, similarly to the movement from the wide end to the tele end, the fitting projection 15b and the rotation sliding projection 18b are pressed against the opposing rotation guide surfaces 22d-A and 22d-B by the separating direction biasing spring 25, respectively. Thus, the third outer cylinder 15 and the helicoid ring 18 rotate together without causing play in the optical axis direction.

  When the rotation in the storage direction is further continued past the wide end position in FIGS. 21 and 25, one end inclined surface 18b-B of the rotary sliding protrusion 18b contacts the opposite inclined surface 22c-B of the inclined groove 22c. Touch. As a result, a component force is generated that moves the helicoid ring 18 backward in the optical axis direction along the opposite oblique surface 22c-B, and the helicoid ring 18 moves backward in the optical axis direction while rotating, contrary to the time when the rotation is extended. start. When the helicoid ring 18 moves a little backward in the optical axis direction due to the relationship between the rotary sliding protrusion 18b and the oblique groove 22c, the male helicoid 18a is screwed back into the female helicoid 22a, and thereafter the male helicoid 18a and the female helicoid 22a Due to the screwing relationship, the helicoid ring 18 is rotated and stored until the storage position shown in FIGS. 20 and 24 is reached. The third lens barrel 15 performs the same rotational storing operation as the helicoid ring 18 by the action of the helicoid ring 18 and the straight guide ring 14, and the fitting protrusion 15b moves in the oblique groove 22c together with the rotating sliding protrusion 18b. . When the helicoid ring 18 and the third lens barrel 15 move rearward in the optical axis direction, the rectilinear guide ring 14 also moves rearward, and the cam ring 11 supported by the rectilinear guide ring 14 also moves rearward. Further, when the helicoid ring 18 is switched from the fixed position rotation to the rotation storing operation, the cam ring roller 32 moves from the circumferential groove portion 14e-1 into the lead groove portion 14e-3, and the cam ring 11 changes to the linear guide ring 14. On the other hand, it relatively moves backward in the optical axis direction while rotating.

  When the rotary slide protrusion 18b moves from the rotary slide groove 22d into the skew groove 22c, the fitting protrusion 15b and the rotary slide protrusion 18b are not subject to the position restriction in the optical axis direction by the rotary slide groove 22d. Therefore, the third outer cylinder 15 and the helicoid ring 18 are positioned in the optical axis direction by loose fitting with respect to the straight guide ring 14 because of the relationship in the photographing state where the optical axis direction position is strictly determined (FIGS. 30 and 31). Returning to the determined relationship (FIGS. 32 and 33). At this time, since the zoom lens barrel 71 is no longer in the photographing state, the positioning of the third outer cylinder 15 and the helicoid ring 18 in the optical axis direction does not have to be exact.

  As described above, in the zoom lens barrel 71 of the present embodiment, the male helicoid 18a, the female helicoid 22a, the rotary sliding protrusion 18b, and the rotary slide formed by the concavo-convex portions provided on the peripheral surfaces of the helicoid ring 18 and the fixed ring 22 facing each other. Only the moving groove 22d can provide the helicoid ring 18 with both the rotation feeding (and rotation storing) operation with movement in the optical axis direction and the fixed position rotation without movement in the optical axis direction. The helicoid fitting has a simple structure and high driving accuracy. Further, the rotational sliding protrusion 18b and the rotational sliding groove 22d for giving a fixed position rotation which cannot be given by the helicoid fitting have a simple structure composed of uneven portions as in the helicoid fitting, and the formation of the helicoid Since it is formed on the same peripheral surface as the surface, no special arrangement space is required. Therefore, a rotation feeding (and storage) operation and a fixed position rotation operation at the feeding position can be provided by a simple, compact and inexpensive structure.

  Further, the rotating member that performs both the rotation feeding (storage) operation and the fixed position rotating operation is divided into a third outer cylinder 15 and a helicoid ring 18 that are relatively movable in the optical axis direction, and then the third outer cylinder. 15 and the helicoid ring 18 are urged in the separation direction by the separation direction urging spring 25, and in a photographing state, the rotation sliding protrusion 18 b of the helicoid ring 18 and the fitting protrusion 15 b of the third outer cylinder 15 are connected to a common rotation slide. The backlash removal in the optical axis direction with respect to the stationary ring 22 is performed by pressing against the opposite end surface on the opposite side of the moving groove 22d. As described above, the rotational sliding groove 22d and the rotational sliding projection 18b constitute a drive mechanism for selectively giving the helicoid ring 18 a rotational extension operation and a fixed-position rotational operation. By using the part also for backlash removal, the number of parts can be reduced.

  Since the separating direction biasing spring 25 is always held between the third outer cylinder 15 and the helicoid ring 18 that rotate integrally, a biasing member for backlash removal is disposed in the vicinity of the fixed ring 22. Does not require any special space. Moreover, since the fitting protrusion 15b is accommodated in the fitting recess 18e, the space efficiency of the joint portion between the third outer cylinder 15 and the helicoid ring 18 is excellent.

  Further, the load caused by the separation direction biasing spring 25 is increased only during photographing where both the rotational sliding projection 18b and the fitting projection 15b are engaged with the rotational sliding groove 22d. Since the degree of compression of the separating direction biasing spring 25 is low during non-photographing, the sliding resistance at the initial stage of lens barrel feeding is kept small, and the durability is excellent.

  The helicoid ring 18 and the third outer cylinder 15 coupled as described above are in a relationship that is first divided when the zoom lens barrel 71 is disassembled. Next, a stopper structure for the helicoid ring 18 and the third outer cylinder 15 and a structure for disassembling and assembling the entire zoom lens barrel 71 related to the stopper structure will be described.

  As shown in FIGS. 8 and 37, the stationary ring 22 is formed with a stopper insertion / removal hole 22e penetrating from the outer peripheral surface toward the bottom of the rotary sliding groove 22d, in the vicinity of the stopper insertion / removal hole 22e. A screw hole (stopper fixing means) 22f and a stopper positioning projection (stopper fixing means) 22g are formed. The disassembly stopper 26 has a stopper projection (locking projection) 26b protruding from an arm portion (circumferential arm portion) 26a along the outer peripheral surface of the fixed ring 22 toward the inner diameter direction, and one end portion of the arm portion 26a. Have a screw insertion hole (stopper fixing means) 26c and a hook portion 26d at the other end. As shown in FIG. 38, in the disassembly stopper 26, with the hook portion 26d engaged with the stopper positioning projection 22g, a stopper fixing screw (stopper fixing means) 67 is inserted into the screw insertion hole 26c to fix the stopper. The screw 67 is fixed to the fixed ring 22 by screwing into the screw hole 22f. In a state where the disassembly stopper 26 is fixed, the stopper projection 26b is inserted in the inner diameter direction of the fixed ring 22 with respect to the stopper insertion / removal hole 22e, and protrudes into the rotary sliding groove 22d (state shown in FIG. 34).

  Three protrusion insertion holes 22h are formed in the front end portion of the fixed ring 22 at intervals in the circumferential direction, and each protrusion insertion hole 22h communicates with each of the three rotation sliding grooves 22d. . Each protrusion insertion / removal hole 22h has an opening width that allows the fitting protrusion 15b to pass in the optical axis direction. FIG. 39 is an enlarged view of the vicinity of the protrusion insertion / removal hole 22h at the tele end (FIGS. 22 and 26) described above. As is apparent from FIG. 39, the fitting protrusion 15b in the rotational direction and Since the phase of the protrusion insertion / removal hole 22h is different, the fitting protrusion 15b cannot escape forward from the rotary sliding groove 22d. FIG. 39 shows only one set of fitting protrusions 15b and protrusion insertion / removal holes 22h, but the remaining two fitting protrusions 15b and protrusion insertion / removal holes 22h have the same positional relationship. At the wide end (FIGS. 21 and 25), each fitting protrusion 15b is further away from the protrusion insertion / removal hole 22h than at the tele end. That is, the third outer cylinder 15 cannot be extracted forward with respect to the fixed ring 22 in the photographing region from the wide end to the tele end in the rotary sliding groove 22d.

  In order to make the phases of the fitting protrusions 15b and the protrusion insertion / removal holes 22h coincide with each other from the tele end position in FIG. 39, it is necessary to further rotate the third outer cylinder 15 together with the helicoid ring 18 at a required disassembly angle Rt1. However, in a state where the stopper projection 26b is inserted into the stopper insertion / removal hole 22e, when the rotation end is rotated by the rotation allowable angle Rt2 from the tele end, the stopper contact surface 18b-E of the rotary sliding projection 18b contacts the stopper projection 26b. In addition, further rotation is restricted (FIG. 34). Since the allowable rotation angle Rt2 is smaller than the required disassembly angle Rt1, the phases of the fitting protrusions 15b and the protrusion insertion / removal holes 22h do not match, and therefore the third outer cylinder 15 cannot be extracted forward. That is, in the rotary sliding groove 22d, the vicinity of the terminal portion communicating with the protrusion insertion / removal hole 22h is a disassembling region. It cannot be rotated.

  When performing disassembly, the disassembly stopper 26 is removed from the stationary ring 22. Specifically, after the stopper fixing screw 67 is removed, the disassembly stopper 26 is pulled up in the outer diameter direction of the fixing ring 22. Then, the stopper protrusion 26b comes out of the stopper insertion / removal hole 22e, and it becomes possible to give the above-mentioned required disassembly angle Rt1 to the third outer cylinder 15 and the helicoid ring 18. FIGS. 23 and 27 show a disassembleable state in which the third outer cylinder 15 and the helicoid ring 18 are rotated from the telephoto end by a required disassembly angle Rt1, and FIG. 40 is an enlarged view of the vicinity of the protrusion insertion hole 22h in the disassembleable state. It is shown. As can be seen from the figure, when the third outer cylinder 15 and the helicoid ring 18 are rotated to this position, the fitting recess 18e of each rotation sliding projection 18b and each projection insertion / removal hole 22h communicate with each other in the optical axis direction. The fitting protrusion 15b accommodated in the fitting recess 18e can be removed forward from the rotary sliding groove 22d through the protrusion insertion hole 22h. That is, the third outer cylinder 15 can be extracted forward with respect to the rotating ring 22. When the fitting protrusion 15b is removed from the rotary sliding groove 22d, the biasing force of the separation direction biasing spring 25 that has pressed the fitting protrusion 15b and the rotary sliding protrusion 18b in the opposite direction is released, and the third outer cylinder is released. The backlash-removing function acting between 15 and the helicoid ring 18 is also eliminated. The positional relationship in the rotational direction between the fitting protrusion 15b and the protrusion insertion / removal hole 22h is set so as to coincide with each other when the rotational sliding protrusion 18b contacts the terminal end of the rotational sliding groove 22d. If the helicoid ring 18 and the third outer cylinder 15 are advanced until the rotation is restricted, the position can be automatically disassembled as shown in FIG.

  The third outer cylinder 15 can be removed from the stationary ring 22 at a specific position in the rotational direction (specific disassembly angle position) as described above. However, the third outer cylinder 15 is also relative to the circumferential groove 14d. The linear guide ring 14 is coupled by the engagement relationship of the rotation guide projection 15d and the engagement relationship of the relative rotation guide projection 14c and the circumferential groove 15e. As can be seen from FIGS. 11 and 12, the relative rotation guide protrusion 14c and the relative rotation guide protrusion 15d are each composed of a plurality of claw-shaped protrusions provided at unequal intervals in the circumferential direction, and some of the protrusions are The width in the circumferential direction is different from other protrusions. On the rear end side of the third outer cylinder 15, a plurality of such relative rotation guide protrusions 14c can be inserted / removed in the optical axis direction only at a specific rotational phase with respect to the circumferential groove 15e. A protrusion insertion / removal hole 15g is formed. Similarly, on the front end side of the linear guide ring 14, a plurality of protrusion insertion / removals that allow a plurality of relative rotation guide protrusions 15d to be inserted / removed in the optical axis direction only at a specific rotational phase with respect to the circumferential groove 14d. A hole 14h is formed.

  FIGS. 41 to 44 show the joint relationship between the third outer cylinder 15 and the rectilinear guide ring 14. FIG. 41 shows the lens barrel storage state (FIGS. 20 and 24), and FIG. 42 shows the wide end. (FIGS. 21 and 25), FIG. 43 corresponds to the tele end (FIGS. 22 and 26), and FIG. 44 corresponds to the disassembled state (FIGS. 23 and 27). As can be seen from FIGS. 41 to 44, during the period from the stowed state to the telephoto end, all the relative rotation guide protrusions 14c and 15d can be simultaneously inserted into and removed from the corresponding protrusion insertion holes 15g and 14h. The third outer cylinder 15 and the rectilinear guide ring 14 are disassembled in the optical axis direction because one of the relative rotation guide protrusions 14c and 15d is always engaged with the protrusion insertion holes 15g and 14h. I can't do it. Only when the disassembly stopper 26 is removed and the third outer cylinder 15 and the helicoid ring 18 are rotated to the disassembly position, all the relative rotation guide protrusions 14c can be inserted into and removed from the protrusion insertion holes 15g. At the same time, all the relative rotation guide protrusions 15d reach positions where they can be inserted into and removed from the protrusion insertion holes 14h. Accordingly, the third outer cylinder 15 can be extracted forward from the straight guide ring 14 as shown in FIGS. 44 and 53 (the fixed ring 22 is not shown in FIG. 53). When the third outer cylinder 15 is extracted, the separation direction biasing spring 25 held between the helicoid ring 18 is exposed and can be removed (FIGS. 36 and 53).

  That is, when the disassembly stopper 26 is removed and the third outer cylinder 15 and the helicoid ring 18 are rotated to the specific disassembly position in the rotation direction, the third outer cylinder 15 can be removed from the rotation ring 22 and the linear guide ring 14 at the same time. become. The corresponding positional relationship among the linear guide ring 14, the third outer cylinder 15, the helicoid ring 18 and the fixed ring 22 at this time is shown as an exploded view in FIG. In other words, the disassembly stopper 26 attached to the stationary ring 22 does not rotate between the helicoids in the rotary sliding groove 22d so that it does not rotate to the above specific disassembly position in the normal use state of the zoom lens barrel 71. 18 and function as a restricting means for limiting the rotation angle of the third outer cylinder 15. As described above, the guide structure including the rotation sliding protrusion 18b and the rotation sliding groove 22d is simple and compact. The simple structure in which the disassembly stopper 26 is added to the guide structure allows the helicoid 18 between normal helicoids to be used. And the rotation angle of the 3rd outer cylinder 15 can be restrict | limited reliably.

  By removing the third outer cylinder 15, the following disassembly is possible. As shown in FIGS. 6 and 7, the front end portion of the third outer cylinder 15 is a front end flange 15h that closes the front end portion of the second rectilinear guide groove 14g, and the rectilinear guide protrusion 13a is formed in the second rectilinear guide groove 14g. The second outer cylinder 13 engaged with the second outer cylinder 13 cannot be extracted forward in a state in which the third outer cylinder 15 is attached to the linear guide ring 14, and the second outer cylinder 13 is not removed until the third outer cylinder 15 is removed. Can be removed. However, the second outer cylinder 13 is further restricted from moving in the optical axis direction with respect to the cam ring 11 when the inner diameter flange 13c and the circumferential groove 11c are engaged. As shown in FIG. 17, the inner diameter flange 13c of the second outer cylinder 13 is divided into a plurality of parts at unequal intervals in the circumferential direction. On the other hand, as shown in FIG. 13, the circumferential groove 11c of the cam ring 11 with which the inner diameter flange 13c engages is composed of three partial circumferential grooves that are separated in the circumferential direction, and further three circumferential directions. Projection insertion / removal holes 11f that open forward are formed in the grooves 11c. The three protrusion insertion / removal holes 11f are arranged at unequal intervals in the circumferential direction.

  49 to 52 show the connection relationship between the second outer cylinder 13 and the first outer cylinder 12 with respect to the cam ring 11, and FIG. 49 shows the lens barrel storage state (FIGS. 20 and 24). 50 corresponds to the wide end (FIGS. 21 and 25), FIG. 51 corresponds to the tele end (FIGS. 22 and 26), and FIG. 52 corresponds to the disassembled state (FIGS. 23 and 27). As can be seen from FIG. 49 to FIG. 51, from the stowed state to the tele end, all the regions of the inner diameter flange 13c made up of a plurality of divided regions are the spaces between the three circumferential grooves 11c and the protrusion insertion / removal holes 11f. However, any part of the inner diameter flange 13c is engaged with the circumferential groove 11c. Therefore, the second outer cylinder 13 cannot be disassembled in the optical axis direction with respect to the cam ring 11. And only when the cam ring 11 rotates around the third outer cylinder 15 to the disassembly position, all the regions of the inner diameter flange 13c become the space between the three circumferential grooves 11c and the protrusion insertion / removal hole 11f. The second outer cylinder 13 can be extracted forward from the cam ring 11 as shown in FIGS. 52 and 54.

  Further, at the disassembled position in FIG. 52, the three first group rollers 31 provided on the first outer cylinder 12 are respectively in the front end open region 11b-x of the first group guide cam groove 11b formed on the outer peripheral surface of the cam ring 11. The first outer cylinder 12 can also be pulled forward as shown in FIG. At this time, since the front end flange 15h of the third outer cylinder 15 does not already exist, the engagement protrusion 12a provided on the outer peripheral surface of the first outer cylinder 12 does not interfere with the front end flange 15h. As shown in FIG. 2, the first group adjusting ring 2 can be removed from the second outer cylinder 12 by releasing the fixing of the first group retaining ring 3 by the fixing screw 64, and the first group adjusting ring 2. The first group lens frame 1 supported inside can also be disassembled.

  In the state shown in FIG. 55, the straight guide ring 14, the helicoid ring 18, the cam ring 11, and the second group lens moving frame 8 inside thereof remain inside the fixed ring 22, but can be further disassembled.

  As can be seen from FIGS. 54 and 55, when the third outer cylinder 15 is removed while the lens barrel is extended from the stationary ring 22, the roller fixing screw 32a is exposed. As shown in FIG. 56, when the cam ring roller 32 is removed together with the roller fixing screw 32a, the element that restricts the movement of the cam ring 11 in the optical axis direction relative to the linear movement ring 14 is eliminated. The combined body of the ring 11 and the second group linear guide ring 10 can be pulled out. As shown in FIG. 56, the first rectilinear guide groove 14f with which the crotch protrusion 10a of the second group rectilinear guide ring 10 is engaged is closed on the front end side and open on the rear end side of the rectilinear movement ring 14. The direction in which the combined body of the cam ring 11 and the second group linear guide ring 10 is pulled out is backward. The second group linear guide ring 10 and the cam ring 11 are engaged so that the outer edge portion of the ring portion 10b and the circumferential groove 11e are relatively rotatable, but this engagement is released at a specific relative position in the rotational direction. It can be disassembled as shown in FIG.

  As shown in FIG. 14, when the helicoid ring 18 and the third outer cylinder 15 are rotated to the above-described disassembly position, the front cam follower 8b-1 is the front cam follower 8b-1 of the second group cam follower 8b of the second group lens moving frame 8. The rear cam follower 8b-2 is located in the front end opening region 11a-2x of the rear cam groove 11a-2. Therefore, the second lens group moving frame 8 can be pulled forward from the cam ring 11 and disassembled as shown in FIG. Since the front end open area 11a-2x of the rear cam groove 11a-2 is formed as a linear groove portion in the optical axis direction, the second group lens moving frame 8 guides straight travel by the second group straight travel guide ring 10 at the disassembled position. Regardless of whether or not it is received (the linear guide key 10c is engaged with the linear guide groove 8a), the cam ring 11 can be linearly pulled forward. It is also possible to remove only the second group lens moving frame 8 in a state where the cam ring 11 and the second group linear guide ring 10 remain inside the straight guide ring 14 as shown in FIG.

  Further, the second group rotation shaft 33 and the second group lens frame 6 can be detached from the second group lens moving frame 8 by releasing the fixation of the second group frame support plates 36 and 37 by the support plate fixing screws 66 ( (See FIG. 3).

  In addition to the internal elements of the cam ring 11, the helicoid ring 18 can also be removed from the fixed ring 22. In this case, the CCD holder 21 is removed from the fixed ring 22, and then the storage direction from the above disassembly position. The helicoid ring 18 is rotated. Then, the three rotary slide protrusions 18b return from the rotary slide groove 22d into the skew groove 22c, the male helicoid 18a and the female helicoid 22a are screwed together, and the helicoid ring 18 moves backward while rotating. When the helicoid ring 18 moves rearward from the position shown in FIGS. 20 and 24, the rotational sliding protrusion 18b is disengaged from the rear end opening region 22c-x of the skew groove 22c, and the male helicoid 18a and the female helicoid 22a are screwed together. Is also released. Accordingly, the helicoid ring 18 is detached rearward from the fixed ring 18 together with the linear guide ring 14.

  The helicoid ring 18 and the rectilinear guide ring 14 are coupled by the engagement relationship between the circumferential groove 18g and the relative rotation guide protrusion 14b. The relative rotation guide protrusion 14b is composed of a plurality of claw-like protrusions provided at unequal intervals in the circumferential direction, like the relative rotation guide protrusion 14c, and the helicoid ring 18 has a plurality of such relative rotations. A plurality of protrusion insertion holes 18h that allow the rotation guide protrusion 14b to be inserted into and removed from the circumferential groove 18g only in a specific relative position in the rotation direction are formed.

  45 to 48 show the coupling relationship between the rectilinear guide ring 14 and the helicoid ring 18. FIG. 45 shows the lens barrel storage state (FIGS. 20 and 24), and FIG. 46 shows the wide end (FIG. 21 and FIG. 25), FIG. 47 corresponds to the tele end (FIGS. 22 and 26), and FIG. 48 corresponds to the disassembled state (FIGS. 23 and 27). As can be seen from these drawings, there is no state in which all the relative rotation guide projections 14b can be simultaneously inserted into and removed from the projection insertion / removal holes 18h in either the storage state or the disassembly state, and the helicoid ring 18 and the straight guide ring 14 cannot be disassembled in the optical axis direction. All the relative rotation guide protrusions 14b can be inserted into and removed from the protrusion insertion / removal hole 18h at the same time when the helicoid ring 18 is further rotated in the storage direction (downward in the figure) from the storage state of FIG. is there. When the helicoid ring 18 is rotated to this position and then the helicoid ring 18 is moved forward (leftward in FIGS. 45 to 49), the relative rotation guide protrusion 14b passes through the protrusion insertion / removal hole 18h, and the circumferential groove 18g. To the rear.

  A relative rotation guide protrusion 14c for engaging with the third outer cylinder 15 is further provided on the outer peripheral surface of the rectilinear guide ring 14 in front of the relative rotation guide protrusion 14b. As described above, each of the relative rotation guide protrusion 14b and the relative rotation guide protrusion 14c includes a plurality of claw-like protrusions provided at unequal intervals in the circumferential direction. In the guide protrusions 14c, the number of protrusions and their intervals, and the widths of the corresponding protrusions in the circumferential direction are the same (see FIG. 12). Therefore, a specific positional relationship in the rotational direction that allows insertion / removal in the optical axis direction also exists between the relative rotation guide projection 14c and the projection insertion / removal hole 18h. When the ring 18 is moved forward, each of the relative rotation guide protrusions 14c enters from the front of the corresponding protrusion insertion / removal hole 18h and exits rearward, so that the helicoid ring 18 can be completely removed from the linear guide ring 14 forward. become. The protrusion insertion / removal hole 18h is formed so as to penetrate through the front and rear ends of the helicoid ring 18 in order to allow the relative rotation guide protrusion 14c to pass in the optical axis direction.

  That is, the helicoid ring 18 and the rectilinear guide ring 14 are removed from the fixed ring 22, and then the relative rotation guide projections 14b and the relative rotation guide projections 14c are separated from the projection insertion / removal holes 18h by a predetermined relative rotation. It becomes possible to disassemble only by performing. In other words, when disassembling the third outer cylinder 15 and the like, the helicoid ring 18 and the rectilinear guide ring 14 are supported inside the fixed ring 22 in a state of being coupled to each other. As described above, since the straight guide ring 14 and the helicoid ring 18 are not disassembled at the same time as the third outer cylinder 15 and the like and remain in the fixed ring 22, the assembling workability in the next assembling is improved.

  As described above, according to the lens barrel of the present embodiment, after the disassembly stopper 26 is removed, the third outer cylinder 15 and the helicoid ring 18 are rotated to a specific disassembly position different from the zoom region and the storage region. Thus, the third outer cylinder 15 that performs the rotation feeding operation and the fixed position rotation can be easily removed. By removing the third outer cylinder 15, the backlash removing function that has acted between the third outer cylinder 15, the helicoid ring 18, the stationary ring 22, and the linear guide ring 14 can be released at the same time. The number of processes is small. Further, the disassembly position for removing the third outer cylinder 15 is also the disassembly position of the second outer cylinder 13, the first outer cylinder 12, the cam ring 11, the second group lens moving frame 8, etc. After removing the tube 15, these elements can be disassembled one after another, and the disassembling workability of the entire lens barrel is excellent.

  Although the disassembly work has been described above, the assembly can be performed by the reverse procedure. That is, the zoom lens barrel 71 of this embodiment is excellent in assembling workability.

  As can be seen from the above description of the embodiment, the lens barrel of the present invention is formed on the rotation guide projection (rotation sliding projection 18b) and the outer annular member (fixed ring 22) provided on the rotation ring (helicoid ring 18). Due to the engagement relationship between the circumferential grooves (rotating sliding groove 22d), it is possible to give not only rotational advance / retreat operation (by helicoid) but also fixed position rotation operation to the rotating ring. The stopper member (disassembly stopper 26 (stopper protrusion 26b)) for restricting the rotation angle of the rotating ring is made to function by being inserted into the circumferential groove for this fixed position rotation guide. The stopper mechanism is obtained.

  In particular, when the stopper protrusion 26b of the disassembly stopper 26 in the illustrated embodiment is inserted into the rotation sliding groove 22d, the position shift in the optical axis direction is caused by the opposing wall surfaces (rotation guide surfaces 22d-A, 22d-B). Since it is limited and always positioned on the movement locus of the rotary sliding projection 18b, it can be reliably brought into contact with the rotary sliding projection 18b without special position adjustment. In addition, when the rotational sliding protrusion 18b comes into contact with the stopper protrusion 26b, the rotation guide surfaces 22d-A and 22d-B of the rotational sliding groove 22d function as a reinforcing portion that prevents the stopper protrusion 26b from shaking. In other words, the structure in which the stopper protrusion 26b is inserted into the rotational sliding groove 22d ensures that the rotational sliding protrusion 18b is secured while the stopper protrusion 26b is thin (using a small disassembly stopper 26). It can be locked.

  As mentioned above, although this invention was demonstrated based on illustration embodiment, this invention is not limited to this embodiment. For example, in the illustrated embodiment, zooming (magnification operation) is performed by moving the first lens group LG1 and the second lens group LG2 in the optical axis direction by the fixed position rotation after the third outer cylinder 15 and the helicoid ring 18 are extended. Although it is performed, the operation given by the fixed rotation of the rotary ring corresponding to the third outer cylinder 15 and the helicoid ring 18 is replaced with focusing instead of zooming, and can be applied as a single focus lens barrel. It is.

  Furthermore, even if the rotation ring corresponding to the third outer cylinder 15 and the helicoid ring 18 of the above-described embodiment is stopped at a fixed position without rotating after completion of feeding (shooting state). The present invention is applicable, and in this case as well, it can be configured as a single focus lens barrel.

  Further, the disassembly stopper 26 of the above embodiment is provided to restrict the rotation of the rotary ring divided into a pair of the third outer cylinder 15 and the helicoid ring 18 to the disassembly possible position. It is also possible to apply to a lens barrel of a type in which the rotating ring is not divided into a plurality of parts.

  Further, as described above, when the stopper projection 26b of the disassembly stopper 26 is inserted / removed in the radial direction with respect to the fixed ring 22 (rotating sliding groove 22d), the rotation guide surfaces before and after the rotating sliding groove 22d as described above. 22d-A and 22d-B are preferable because they also function as a positioning portion and a reinforcing portion for the stopper projection 26b. However, the attaching / detaching direction of the stopper member in the present invention is not limited to this. For example, it is possible to adopt a structure in which the stopper member is attached to and detached from the optical axis direction.

  In the embodiment, the fixing ring 22 to which the disassembly stopper 26 is attached and detached is a fixing member for the camera body 72. However, depending on the structure of the lens barrel to which the present invention is applied, the fixing ring 22 may be a linear member that moves in the optical axis direction. It is also possible to attach a stopper member.

  Further, in the lens barrel of the embodiment, in order to easily ensure the positional accuracy of the helicoid ring 18 at the fixed position rotation, the protrusion amount of the rotation sliding protrusion 18b to be engaged with the rotation sliding groove 22d is set as the male helicoid. This is larger than the protruding amount of 18a (the engaging amount of the rotary sliding protrusion 18b and the rotary sliding groove 22d in the lens barrel radial direction is increased). However, it is also possible to make the amount of protrusion of the rotary sliding protrusion 18b smaller than that of the embodiment so as to be equal to or less than that of the male helicoid 18a as long as the required positional accuracy is not impaired. In this case, it is possible to avoid interference with the rotary sliding projection 18b without forming a clearance groove such as the skew groove 22c on the fixed ring 22 side. That is, when the protruding amount of the rotary sliding protrusion 18b does not exceed the protruding amount of the male helicoid 18a, a non-helicoid region having a width (and direction) corresponding to the skew groove 22c is formed on the forming region of the female helicoid 22a. Just do it. Specifically, if the interval between some of the helicoid peaks of the female helicoid 22a is increased, a non-helicoid region replacing the skew groove 22c can be obtained. In other words, it can be said that the oblique groove 22 c is also a kind of non-helicoid region on the stationary ring 22.

  On the contrary, the skew groove 22c can be positively used as a mechanism for assisting the helicoid rather than a simple escape groove. In other words, in the embodiment, the end slopes 18b-A and 18b-B of the rotational sliding projection 18b are arranged in the oblique groove 22c so as not to interfere with the guide function by the helicoids 18a and 22a when the helicoid ring 18 rotates and retreats. It is not engaged with the opposing oblique surfaces 22c-A and 22c-B. However, if sufficient forming accuracy sufficient to prevent the guide function by the helicoid is obtained, the end inclined surfaces 18b-A, 18b-B and the opposing oblique surfaces 22c-A, 22c-B are engaged to rotate. It may be used as a guide surface during advancement and retreat.

Further, in the embodiment, the rotational sliding protrusion 18b, the oblique groove 22c, the rotational sliding groove 22d, etc. are provided at three positions with different positions in the circumferential direction, but the number is other than three. May be.

It is a disassembled perspective view of the zoom lens barrel to which the present invention is applied. FIG. 2 is an exploded perspective view of elements relating to a support mechanism for a first lens group in the zoom lens barrel of FIG. 1. FIG. 3 is an exploded perspective view of elements relating to a support mechanism for a second lens group in the zoom lens barrel of FIG. 1. FIG. 5 is an exploded perspective view of elements relating to a feeding mechanism from a fixed ring to a third outer cylinder in the zoom lens barrel of FIG. 1. FIG. 2 is a perspective view of a completed state in which a zoom motor and a finder unit are added to the zoom lens barrel of FIG. 1. It is a longitudinal cross-sectional view which shows the use state of a wide end and a tele end of the camera carrying the zoom lens barrel to which this invention is applied. It is a longitudinal cross-sectional view of the camera barrel storage state of the camera. It is a development top view of a fixed ring. It is an expansion | deployment top view of a helicoid ring. It is an expanded top view which shows through the component by the side of the internal peripheral surface of a helicoid ring. It is an expansion | deployment top view of a 3rd outer cylinder. It is an expansion | deployment top view of a rectilinear guide ring. It is an expansion | deployment top view of a cam ring. It is a development top view seeing through and showing the 2nd group guide cam groove of the inner peripheral surface side of a cam ring. It is an expansion | deployment top view of a rectilinear guide ring. It is a development top view of the 2nd group lens movement frame. It is an expansion | deployment top view of a 2nd outer cylinder. It is an expansion | deployment top view of a 1st outer cylinder. It is a figure which shows notionally the operation | movement relationship of the main components of the zoom lens barrel of this embodiment. It is an expansion | deployment top view which shows the relationship between the helicoid ring in a lens-barrel accommodation state, a 3rd outer cylinder, and a fixed ring. It is an expansion | deployment top view which shows the relationship between the helicoid ring in a wide end, a 3rd outer cylinder, and a fixed ring. It is an expansion | deployment top view which shows the relationship between the helicoid ring in a tele end, a 3rd outer cylinder, and a fixed ring. It is an expansion | deployment top view which shows the relationship between the helicoid ring in a lens-barrel decomposition | disassembly state, a 3rd outer cylinder, and a fixed ring. It is an expansion | deployment top view of a stationary ring which shows the position of the rotation sliding protrusion of a helicoid ring in a lens-barrel accommodation state. It is an expansion | deployment top view of a stationary ring which shows the position of the rotation sliding protrusion of a helicoid ring in a wide end. It is an expansion | deployment top view of a stationary ring which shows the position of the rotation sliding protrusion of the helicoid ring in a tele end. It is an expansion | deployment top view of a stationary ring which shows the position of the rotation sliding protrusion of a helicoid ring in a lens-barrel decomposition | disassembly state. FIG. 25 is a cross-sectional view of a helicoid ring and a stationary ring along the line XXVIII-XXVIII in FIG. 24. It is sectional drawing of the helicoid ring vicinity which follows the XXIX-XXIX sectional line of FIG. It is sectional drawing which expands and shows a part of upper half cross section (wide end) of the imaging | photography state of FIG. It is sectional drawing which expands and shows a part of lower half cross section (tele end) of the imaging | photography state of FIG. It is sectional drawing which expands and shows a part of upper half cross section of the lens-barrel accommodation state of FIG. It is sectional drawing which expands and shows a part of lower half cross section of the lens-barrel accommodation state of FIG. It is a perspective view which expands and shows a part of coupling | bond part of a 3rd outer cylinder and a helicoid ring. It is a perspective view of the state which removed the decomposition stopper from FIG. It is a perspective view which shows the state which divided | segmented the 3rd outer cylinder and the helicoid ring in the optical axis direction from the state of FIG. It is a perspective view in the state where the decomposition stopper was removed from the fixed ring. It is a perspective view of the state where the disassembly stopper was attached to the fixed ring. It is an expansion | deployment top view which expands and shows the relationship between the rotation sliding protrusion of the helicoid ring in the tele end, and the circumferential groove | channel of a stationary ring. It is an expanded top view which expands and shows the relationship between the rotation sliding protrusion of a helicoid ring and the circumferential groove | channel of a stationary ring in a lens-barrel decomposition | disassembly state. It is an expansion | deployment top view which shows the relationship between the 3rd outer cylinder and a linear guide ring in a lens-barrel accommodation state. It is an expansion | deployment top view which shows the relationship between the 3rd outer cylinder and a linear guide ring in a wide end. It is an expansion | deployment top view which shows the relationship between the 3rd outer cylinder and a linear guide ring in a tele end. It is an expansion | deployment top view which shows the relationship between the 3rd outer cylinder and a rectilinear guide ring in a lens-barrel decomposition | disassembly state. It is an expansion | deployment top view which shows the relationship between the helicoid ring in a lens-barrel accommodation state, and a linear guide ring. It is an expansion | deployment top view which shows the relationship between the helicoid ring and linear guide ring in a wide end. It is an expansion | deployment top view which shows the relationship between the helicoid ring in a tele end, and a rectilinear guide ring. It is an expansion | deployment top view which shows the relationship between the helicoid ring in a lens-barrel decomposition | disassembly state and a linear guide ring. It is an expanded top view which shows the relationship of the cam ring in a lens-barrel accommodation state, a 1st outer cylinder, a 2nd outer cylinder, and a 2nd group linear guide ring. It is a development top view showing the relation of the cam ring in the wide end, the 1st outer cylinder, the 2nd outer cylinder, and the 2nd group straight guide ring. It is a development top view showing the relation of the cam ring in the tele end, the 1st outer cylinder, the 2nd outer cylinder, and the 2nd group straight guide ring. It is a development top view showing the relation of a cam ring in the lens barrel decomposition state, the 1st outer cylinder, the 2nd outer cylinder, and the 2nd group straight guide ring. It is a perspective view of the decomposition state which removed the 3rd outer cylinder. It is a perspective view of the decomposition | disassembly state which removed the 2nd outer cylinder and the roller biasing spring from FIG. FIG. 55 is a perspective view of an exploded state in which the first is further removed from FIG. 54. FIG. 56 is a perspective view of a disassembled state in which the cam ring roller, the cam ring, and the second group linear guide ring are further removed from FIG. It is an expansion | deployment top view which shows the decomposition | disassembly angle position (specific decomposition | disassembly angle position) of the 3rd outer cylinder with respect to a stationary ring, a rectilinear guide ring, and a helicoid ring.

Explanation of symbols

A Aperture LG1 First lens group (movable lens group)
LG2 Second lens group (movable lens group)
LG3 Third lens group LG4 Low-pass filter S Shutter Z0 Lens barrel central axis (rotation central axis)
Z1 Shooting optical axis Z2 Retraction optical axis Z3 Optical axis 1 of the finder objective system 1st group lens frame 1a Male adjustment screw 2 1st group adjustment ring 2a Female adjustment screw 2b Guide protrusion 2c Engaging claw 3 1st group retaining ring 3a Spring receiving part 6 Second group lens frame 8 Second group lens moving frame 8a Straight guide groove 8b Second group cam follower 8b-1 Front cam follower 8b-2 Rear cam follower 10 Second group straight guide ring 10a Crotch protrusion 10b Ring portion 10c Straight guide key 11 Cam ring 11a Second group guide cam groove 11a-1 Front cam groove 11a-2 Rear cam groove 11a-2x Front end open area 11b Group first guide cam groove 11b-x Front end open area 11c 11e Circumferential groove 11d Barrier drive ring pressing surface 11f Projection insertion / removal Hole 12 First outer cylinder 12a Engagement protrusion 12b Group 1 adjustment ring guide groove 13 Second outer cylinder 13a Straight guide groove 13b Straight guide groove 13c Inner diameter flange 14 Rectilinear guide ring 14a rectilinear guide protrusion 14b 14c relative rotation guide protrusion 14d circumferential groove 14e roller guide through groove 14e-1 14e-2 circumferential groove 14e-3 lead groove 14f first rectilinear guide groove 14g second rectilinear guide groove 14h Projection insertion / removal hole 15 third outer cylinder (rotating ring, interlocking rotating ring)
15a Rotation transmission protrusion 15b Fitting protrusion (optical axis direction movement restricting protrusion)
15b-A Sliding contact surface 15c Spring contact recess 15d Relative rotation guide projection 15e Circumferential groove 15f Roller fitting groove (rotation transmission groove)
15g Protrusion insertion / removal hole 15h Front end flange 17 Roller biasing spring 17a Roller pressing piece 18 Helicoid ring (rotating ring)
18a Male helicoid (rotational advance / retreat mechanism)
18b Rotating sliding protrusion (Rotating guide protrusion)
18b-A 18b-B End slope 18b-C Front sliding surface 18b-D Rear sliding surface 18b-E Stopper contact surface 18c Spur gear portion 18d Rotation transmission recess 18e Fitting recess 18f Spring insertion recess 18g Circumferential groove 18h Projection insertion / removal hole 21 CCD holder 21a Cam projection 22 Fixed ring (outer annular member)
22a Female helicoid (rotational advance / retreat mechanism)
22b Straight guide groove 22c Skew groove (no helicoid area)
22c-A 22c-B Opposed skewed surface 22c-x Rear end open area 22d Rotating sliding groove (circumferential groove)
22d-A 22d-B Rotation guide surface (opposite wall surface)
22e Stopper insertion / removal hole (radial through hole)
22f Screw hole (stopper fixing means)
22g Stopper positioning protrusion (stopper fixing means)
22h Protrusion insertion / removal hole 22z Front annular region 24 Group 1 biasing spring 25 Separating direction biasing spring (biasing member)
26 Disassembly stopper (stopper member)
26a Arm part (circumferential arm part)
26b Stopper protrusion (locking protrusion)
26c Screw insertion hole (fixing means for stopper)
26d Hook (stopper fixing means)
28 zoom gear 29 zoom gear shaft 30 finder gear 31 first group roller 32 cam ring roller 32a roller fixing screw 33 second group rotation shaft 35 rotation restriction pin 36 37 second group lens frame support plate 38 axial direction pressure spring 39 second group lens frame Return spring 51 AF lens frame (3 group lens frame)
52 53 AF guide shaft 54 AF nut 55 AF frame biasing spring 60 CCD (solid-state imaging device)
61 Packing 62 CCD base plate 64 Stop ring fixing screw 66 Support plate fixing screw 67 Stopper fixing screw (stopper fixing means)
70 Digital camera 71 Zoom lens barrel 72 Camera body 73 Filter holder 74 Reduction gear box 75 Lens drive control FPC board 76 Shutter unit 77 Exposure control FPC board 80 Viewfinder unit 81a Objective window 81b 81c Movable variable magnification lens 81d Prism 81e Eyepiece 81f Eyepiece window 83 84 Holding frame 85 86 Guide shaft 90 Cam gear 101 Barrier cover 102 Barrier pressure plate 103 Barrier drive ring 104 105 Barrier blade 106 Barrier biasing spring 107 Barrier drive ring biasing spring 140 Control circuit 150 Zoom motor 160 AF motor

Claims (16)

A rotating ring that is rotatable about a rotation center axis parallel to the optical axis, and that moves at least one optical element in the optical axis direction by rotation;
A non-rotating outer annular member having a circumferential groove on an inner circumferential surface that supports the rotating ring on the inner side and faces the rotating ring;
Provided between the inner peripheral surface of the outer annular member and the outer peripheral surface of the rotary ring, and when the rotary ring is rotated, the rotary ring is placed at the moving end in the optical axis direction with respect to the outer annular member. Rotational advance / retreat mechanism that advances and retracts between;
When the rotating ring provided on the outer peripheral surface of the rotating ring is moved to one moving end in the optical axis direction by the rotation advance / retreat mechanism, the rotating ring is engaged with the circumferential groove to move the rotating ring in the optical axis direction. A rotation guide projection that rotates in a fixed position without being inserted; and a circumferential groove that can be inserted into and removed from the middle position in the length direction of the circumferential groove and engages with the rotation guide projection in the inserted state in the circumferential groove. A stopper member for restricting the rotation angle of the rotary ring in the interior and releasing the restriction in the removed state;
A lens barrel characterized by comprising: 2. The lens barrel according to claim 1, wherein the stopper member is insertable / removable in the radial direction of the outer annular member with respect to the circumferential groove. 3. The lens barrel according to claim 1, wherein a plurality of the rotation guide protrusions and circumferential grooves are provided at different positions in the circumferential direction, and the stopper member is one of the plurality of rotation guide protrusions. A lens barrel that can be engaged with the lens barrel. 4. The lens barrel according to claim 1, wherein the outer annular member has a radial through hole that penetrates an outer peripheral surface of the outer annular member and a bottom portion of the circumferential groove in a radial direction. 5. Have
The stopper member protrudes toward the inner diameter direction of the outer annular member from the circumferential arm portion mounted along the outer peripheral surface of the outer annular member, and is inserted into and removed from the radial through hole. A lens barrel provided with possible locking projections. 5. The lens barrel according to claim 4, further comprising fixing means for fixing the circumferential arm portion of the stopper member to the outer annular member. 6. The lens barrel according to claim 5, wherein the fixing means is
Screw insertion holes and hooks provided at one end and the other end of the circumferential arm of the stopper member;
A positioning protrusion provided on the outer annular member that can be engaged with the hook portion; a screw hole that overlaps the screw insertion hole when the positioning protrusion and the hook portion are engaged; and screwed into the screw hole through the screw insertion hole; Fixed screw;
Lens barrel equipped with. 7. The lens barrel according to claim 1, wherein the rotation advance / retreat mechanism includes a male helicoid formed on an outer peripheral surface of a rotating ring and an inner peripheral surface of the outer annular member. A lens barrel that is disengaged when the rotation guide projection and the circumferential groove are engaged with each other. 8. The lens barrel according to claim 7, wherein a non-helicoid region that is parallel to the female helicoid and communicates with the circumferential groove is formed on the female helicoid forming region on the inner peripheral surface of the outer annular member. When the helicoid is screwed, the rotation guide projection is a lens barrel located in the non-helicoid region. The lens barrel according to any one of claims 1 to 8,
An interlocking rotating ring that can move relative to the rotating ring in the direction of the optical axis and rotates integrally in the rotating direction;
Optical axis direction movement that simultaneously engages the circumferential groove at the relative position in the optical axis direction of the rotating ring and the outer annular member that the rotation guide projection engages with the circumferential groove provided on the outer peripheral surface of the interlocking rotating ring. A projection in the optical axis direction formed in communication with the circumferential groove at a specific disassembly angle position in the rotation direction of the outer annular member, which enables the optical axis direction movement regulating projection to be engaged with and disengaged from the circumferential groove. Insertion and removal holes;
With
The stopper member is a lens barrel that restricts rotation of the rotating ring and the interlocking rotating ring to the specific disassembly angle position in an inserted state in the circumferential groove. 10. The lens barrel according to claim 9, wherein the rotation guide protrusion and the optical axis direction movement restricting protrusion that urge the rotation ring and the interlocking rotation ring away from each other and engage with the circumferential groove are respectively provided in the circumferential groove. A lens barrel having a biasing member that is pressed against the opposite wall surface on the opposite side. 11. The lens barrel according to claim 1, wherein the optical element is at least two movable lens groups that relatively move in the optical axis direction by rotation of the rotating ring. 12. The lens barrel according to claim 1, wherein the outer annular member is a fixed member fixed to a camera body of a camera. A pair of rotating rings which are rotatable about a rotation center axis parallel to the optical axis and which move at least one optical element in the optical axis direction by rotation;
A non-rotating outer annular member that supports the pair of rotating rings on the inside and has a circumferential groove on an inner peripheral surface facing the rotating rings;
Provided between the inner peripheral surface of the outer annular member and the outer peripheral surface of the rotary ring, and when the rotary ring is rotated, the rotary ring is placed at the moving end in the optical axis direction with respect to the outer annular member. Rotational advance / retreat mechanism that moves forward and backward
The rotating ring provided on one outer peripheral surface of the pair of rotating rings engages with the circumferential groove when the rotating ring is moved to one moving end in the optical axis direction by the rotation advance / retreat mechanism, and the rotating ring is moved to the optical axis. Rotating guide protrusion that rotates in place without moving in the direction;
An optical axis direction in which the rotation guide projection provided on the outer peripheral surface of the other rotary ring engages with the circumferential groove at the same relative position in the optical axis direction between the rotary ring and the outer annular member engaged with the circumferential groove. Movement restriction protrusion;
A protrusion insertion / removal hole formed in the outer annular member, which allows the optical axis direction movement restricting protrusion to be engaged / disengaged in the optical axis direction at a specific disassembly position in the rotational direction with respect to the circumferential groove; and a length of the circumferential groove A state where it can be inserted / removed at a midway position in the vertical direction, and is inserted into the circumferential groove to engage with the rotation guide projection and restrict the rotation of the pair of rotating rings to the specific disassembly position, and is removed A stopper member for releasing the restriction with
A lens barrel characterized by comprising: 14. The lens barrel according to claim 13, wherein the stopper member can be inserted into and removed from the circumferential groove in the radial direction of the outer annular member. 15. The lens barrel according to claim 13, wherein the rotation guide protrusion and the optical axis direction movement restricting protrusion that urge the pair of rotating rings in a direction away from each other and engage with the circumferential groove are respectively provided in the circumferential groove. A lens barrel having a biasing member that is pressed against the opposite wall surface on the opposite side. 16. The lens barrel according to claim 13, wherein a plurality of the rotation guide protrusions and circumferential grooves are provided at different positions in the circumferential direction, and the stopper member includes a plurality of rotations. A lens barrel that can be engaged with one of the guide protrusions.

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