JP6380079B2 - Rotating member position detecting device and lens barrel - Google Patents

Description

  The present invention relates to a rotation member position detection device that detects the position of a rotation member and a lens barrel that includes the rotation member position detection device.

  A rotation member position detection device that detects the position of a rotation member is disclosed in Patent Document 1, for example. The rotating member position detecting device disclosed in Patent Document 1 forms a part of a diaphragm device for a lens barrel, and the first holding member and the first holding member are interposed between the first holding member and the second holding member. A detection sensor that detects a position of the rotating member that is rotatably held by the second holding member with respect to the first holding member, and a detection that holds the detection sensor and is attached to the second holding member And a sensor holder. In addition, a plurality of diaphragm blades are engaged with each of the rotating member and the first holding member, and the diameter of the opening formed by the plurality of diaphragm blades increases as the rotating member rotates in one direction. Thus, the diameter of the opening is reduced as the rotating member rotates in the other direction. And the position of the rotation member with respect to the 1st holding member in which the said opening will be in a fully open state is detected with a detection sensor.

JP 2007-25095 A

  The position information of the rotating member detected as described above is used, for example, in a photometry and exposure system that narrows down the aperture value calculated from the photometric value when the aperture blades are fully opened at the time of shooting. Therefore, it is necessary to accurately grasp the initial position of the aperture blade. However, in Patent Document 1, the second holding member is configured separately from the first holding member with which the diaphragm blades are engaged, and is fixed to the first holding member. The held detection sensor holder is attached to a predetermined position of the second holding member. Accordingly, an error occurs in the position of the detection sensor holder holding the detection sensor with respect to the first holding member depending on the position of the second holding member with respect to the first holding member and the position of the detection sensor holder with respect to the second holding member. For this reason, the position of the detection sensor holder with respect to the first holding member varies due to a dimensional error at the time of manufacturing the first holding member, the second holding member, and the detection sensor holder, a positional deviation at the time of assembly, and the like. It is difficult to accurately detect the position of the rotating member by the detection sensor.

  It is an object of the present invention to provide a rotating member position detecting device and a lens barrel that can accurately detect the position of the rotating member with respect to a first holding member with a detection sensor.

  According to another aspect of the present invention, there is provided a rotating member position detecting device that determines a position of a rotating member that is rotatably held by a first holding member and a second holding member attached to each other with respect to the first holding member. A detection member for detecting is provided, and any one of the first holding member, the second holding member, and the detection member positions the first holding member, the second holding member, and the detection member. The remaining one other than the one includes a first engagement portion that engages with the first positioning portion, and is either one of the detection member and the second holding member. One includes a second positioning portion that positions the detection member and the second holding member, and one of the other includes a second engagement portion that engages with the second positioning portion. And

  According to this, the 1st positioning part positions the detection member with respect to a 2nd holding member, and positions the detection member with respect to a 1st holding member. Thereby, even when the first holding member and the second holding member are configured separately, the detection member attached to the second holding member is positioned at a predetermined position with respect to the first holding member. In addition, since the position of the detection member relative to the first holding member can be determined when the position of the detection member relative to the second holding member is determined by the second positioning portion, the positioning operation of the detection member relative to the first holding member is easy. Can be.

  In another aspect, in the rotating member position detecting device, the first engaging portion is formed on the first holding member engaging portion formed on the first holding member and the second holding member. A second holding member engaging portion, wherein the second engaging portion is formed on the second holding member, and the detection member includes a detection sensor and a detection sensor holder holding the detection sensor. Each of the first and second positioning portions is a shaft protruding from the detection sensor holder, and the first positioning portion is formed to have a longer protruding length from the detection sensor holder than the other. The first holding member engaging portion and the second holding member engaging portion are engaged with each other, and the first positioning portion is engaged with the second engaging portion. And

  According to this, if a 1st positioning part is engaged with each of the engaging part for 1st holding members, and the engaging part for 2nd holding members, a detection sensor holder will be a 1st holding member and a 2nd holding member. Is positioned. Further, since the second positioning portion is received by the second engaging portion, the second positioning portion is prevented from rotating around the first positioning portion, and the detection sensor holder is securely attached to the second holding member. Can be maintained in a state of being positioned. Further, the first positioning part and the second positioning part can be easily formed.

  In addition, the first positioning portion and the second positioning portion can be integrally formed when the detection sensor holder is formed, and the first positioning portion and the second positioning portion can be easily formed.

  In another aspect, in the rotating member position detection device, the second holding member is a plate-shaped annular body, and the first positioning unit is configured such that the detection sensor holder is attached to the second holding member. In the state, the second holding member is disposed on the radially outer side of the detection sensor.

  According to this, the position of the detection sensor can be more accurately arranged with respect to the second holding member and the first holding member. Moreover, interference with the rotating member can be avoided and the diameter can be reduced.

  In another aspect, in the rotating member position detecting device, the rotating member is fitted to the first holding member so as not to be radially movable.

  According to this, the relative positional accuracy of the rotating member and the first holding member is increased, and the position of the rotating member can be detected more accurately.

  In another aspect, in the rotating member position detecting device, the second holding member holds a driving member that rotates the rotating member.

  According to this, the rotation member can be easily driven to rotate with respect to the second holding member, and the manufacture can be facilitated. In addition, since the second holding member holds the driving member, a separate member for holding the driving member can be eliminated, and the number of parts can be reduced.

  A lens barrel according to an aspect of the present invention includes any one of the rotating member position detection devices described above.

  According to this, when the position of the detection sensor holder with respect to the second holding member is determined by one of the first positioning portion and the second positioning portion, the position of the detection sensor holder with respect to the first holding member is also determined. Accordingly, in this state, the second holding member is positioned with respect to the first holding member. Thereby, for example, even when the first holding member and the second holding member are configured separately, the detection sensor holder is positioned at a predetermined position with respect to the first holding member when the detection sensor holder is attached to the second holding member. . In addition, since the position of the detection sensor holder with respect to the first holding member is determined when the position of the detection sensor holder with respect to the second holding member is determined by one of the first positioning portion and the second positioning portion, the first The positioning operation of the detection sensor holder with respect to the holding member can be facilitated.

  In another aspect, the lens barrel further includes a plurality of diaphragm blades engaged with the rotating member and the first holding member, and the plurality of diaphragm blades are formed by the plurality of diaphragm blades. The aperture blades are arranged so as to form an opening, and the diameter of the opening increases in accordance with the rotation of the rotating member in one direction, and the rotating member rotates in the other direction. Accordingly, the rotating member and the first holding member are movably engaged with each other so that the diameter of the opening is small or the opening is closed.

  According to this, the position of the rotating member with respect to the first holding member, to which the diaphragm blade is engaged so as to be movable in each of the rotating member and the first holding member, is the rotation attached to the second holding member. The moving member position detecting device can accurately detect the moving member position. Therefore, it becomes suitable for detecting the position of the aperture blade engaged so as to be movable in each of the rotating member and the first holding member.

  The rotating member position detecting device and the lens barrel of the present invention can accurately detect the position of the rotating member with respect to the first holding member by the detection sensor.

It is sectional drawing of the lens barrel of one embodiment of this invention. It is a disassembled perspective view of the aperture device used for the lens barrel of FIG. FIG. 3 is a rear view of the diaphragm device in FIG. 2. FIG. 4 is a rear view of a state in which a diaphragm blade operation member used in the diaphragm device is rotated to a predetermined position from the state of FIG. 3. It is a disassembled perspective view of the principal part of the camera-shake correction mechanism part used for the lens barrel of FIG. It is the front view which expanded a part of the state which rotated and stopped the rotation ring used for the camera-shake correction mechanism part of FIG. It is the front view which expanded a part of the state which rotated and rotated the rotation ring to the opposite direction from the state of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a lens barrel of the present invention, and FIG. 2 is an exploded perspective view of a diaphragm device used in the lens barrel of FIG. In the following description, the X direction in the figure is the object side, and the Y direction is the image side.

  The lens barrel 1 of this embodiment includes a barrel body 2 and an aperture device 6 as shown in FIG. The lens barrel body 2 includes a cylindrical fixed tube 4, lens groups 51 to 54, and a camera shake correction mechanism unit 3.

  In this embodiment, the lens group includes a first lens group 51, a second lens group 52, a third lens group 53, and a fourth lens group 54 that are arranged in order from the object side to the image side.

  The first lens group 51 and the third lens group 53 are each provided with one or a plurality of lenses, and the effective diameter outer portions 511 and 531 of the first lens group 51 and the third lens group 53 are provided in the fixed cylinder 4. It is held fixedly.

  The second lens group 52 includes one or more lenses, and the effective diameter outside 521 of the second lens group 52 is movable to the fixed cylinder 4 in the optical axis direction (XY direction, axial direction of the fixed cylinder 4). Is held in.

  The fourth lens group 54 forms a camera shake correction lens, and includes one or a plurality of lenses. The effective diameter outside 541 of the fourth lens group 54 can be switched between a fixed state and a fixed release state with respect to the fixed cylinder 4. Is retained.

  Although not shown, a first coil and a second coil are attached to the effective diameter outside 541 of the fourth lens group 54. In addition, a radially inner clamping portion 541c that is fixed to the ring holding member 32 via a fixing operation piece 314 of the rotating ring 31 described later is attached to the effective diameter outside 541 of the fourth lens group 54.

  As shown in FIG. 5, the camera shake correction mechanism unit 3 includes a rotation ring 31, a ring holding member 32 that rotatably holds the rotation ring 31, and a rotation restriction member 33 that stops the rotation ring 31. And.

  In this embodiment, the rotation ring 31 is for switching the fourth lens group 54 between the fixed state and the fixed release state with respect to the ring holding member 32, and the rotation ring 31 is substantially annular. Provided on the outer periphery are a first contact stop portion 311 and a second contact stop portion 312 that are arranged at intervals in the circumferential direction and are contacted to the rotation restricting member 33.

  In this embodiment, the first stopper part 311 and the second stopper part 312 have a part of the outer periphery of the rotating ring 31 having a predetermined length in the circumferential direction and a substantially U-shape radially inward. The concave inner surface 310 is formed, and the inner surfaces on the two clockwise inner surfaces in FIG. 2 and FIG. The inner surface on the counterclockwise side in FIG. 6 is the second stopper portion 312.

  Moreover, the rotation ring 31 includes a gear portion 313 on the circumferential direction side of the first stopper portion 311 on the outer periphery.

  The rotating ring 31 includes a fixing operation piece 314 on the image-side surface facing the ring holding member 32. The fixing operation piece 314 is provided so as to protrude from the image-side surface of the rotation ring 31 toward the image-side ring holding member 32.

  As shown in FIGS. 1 and 5, the ring holding member 32 includes a first ring holding member 321 that rotatably holds the rotating ring 31 on the object-side surface facing the rotating ring 31, and a fourth lens group. The second ring holding member 322 is provided on the opposite side of the first ring holding member 321 across the effective diameter outer portion 541 of 54.

  The first ring holding member 321 has a plurality of (three in this embodiment) holding pieces 321f that hold the rotation ring 31 in a freely rotatable manner on the object side surface, and one holding the rotation restricting member 33. The holding shaft 321a and rotation preventing portions 321b and 321c for preventing the rotation restricting member 33 held by the holding shaft 321a from rotating around the holding shaft 321a are provided.

  In this embodiment, the holding shaft 321a is formed in a cylindrical shape, and protrudes from the one surface of the first ring holding member 321 to the rotating ring 31 side.

  The anti-rotation part includes two first anti-rotation parts 321b and a second anti-rotation arranged so as to form a rotation restricting member receiving part 320 therebetween in the circumferential direction of the rotation ring 31. Part 321c.

  The first ring holding member 321 includes a ring drive gear 321e that meshes with the gear portion 313 of the rotating ring 31 on the circumferential side of the holding shaft 321a. The ring drive gear 321e is attached to the shaft of the drive motor 321h held on the image-side surface of the first ring holding member 321 and moves in one direction as the drive motor 321h rotates in one direction. Rotates and rotates in the other direction with the rotation of the drive motor 321h in the other direction.

  The first ring holding member 321 includes a light passage hole 321i at the center, and a radially outer clamping portion 321g on the inner periphery of the hole 321i. The radially outer sandwiching portion 321g is formed at a position that is larger in diameter than the diameter of the radially inner sandwiching portion 541c.

  The first ring holding member 321 configured as described above holds the rotating ring 31 by the holding piece 321f and is fixedly held by the fixed cylinder 4 in this state. As the ring drive gear 321e rotates in one direction, the rotating ring 31 rotates in the other direction opposite to the ring drive gear 321e, and rotates in accordance with the rotation in the other direction of the ring drive gear 321e. The moving ring 31 rotates in one direction.

  As shown in FIG. 5, the second ring holding member 322 includes a light passage hole 322 d at the center. In addition, the second ring holding member 322 is disposed at a position facing the first coil attached to the fourth lens group 54 on the object side surface facing the effective diameter outside 541 of the fourth lens group 54. A magnet (not shown) and a second magnet (not shown) arranged at a position facing the second coil are provided.

  The second ring holding member 322 configured as described above is disposed on the image side of the first ring holding member 321 and is fixedly held by the fixed cylinder 4.

  In this state, the effective diameter outside 541 of the fourth lens group 54 is provided between the first ring holding member 321 and the second ring holding member 322 on the second ring holding member 322 by a biasing member (not shown). It is arranged so as to be movable in the radial direction of the fixed cylinder 4 orthogonal to the optical axis direction so as to be pressed against a bearing (not shown). Further, a gap 7 is formed in the radial direction between the radially outer sandwiching portion 321 g of the first ring holding member 321 and the radially inner sandwiching portion 541 c of the fourth lens group 54.

  The rotation restricting member 33 is made of an elastic body such as synthetic rubber or urethane foam. The rotation restricting member 33 of this embodiment has a substantially rectangular parallelepiped shape with a predetermined thickness as shown in FIG. 5 and includes a shaft fitting hole 331 into which the holding shaft 321a of the first ring holding member 321 is fitted. . The shaft insertion hole 331 is formed in a circular cross section so as to penetrate from the front surface to the rear surface in the thickness direction.

  Further, the rotation restricting member 33 includes a fitting insertion portion 332 that is fitted into the rotation restricting member receiving portion 320 of the first ring holding member 321 on one side in the longitudinal direction, and is pivoted on the other side in the longitudinal direction. There are provided stop portions 333 a and 333 b for stopping the ring 31.

  The fitting insertion portion 332 includes a first contact portion 332 a that contacts the first detent portion 321 b of the first ring holding member 321 on one end surface in the width direction of the rotation restriction member 33. A second abutting portion 332b that abuts on the second detent portion 321c of the first ring holding member 321 is provided on the other end surface in the width direction.

  The stopper part is formed on one end face in the width direction of the rotation restricting member 33, and a first stopper part 333 a that contacts the first stopper part 311 of the rotation ring 31 and the width of the rotation restricting member 33. And a second contact stop portion 333b that is formed on the other end surface in the direction and stops the second contact stop portion 312 of the rotation ring 31.

  As shown in FIG. 6, the rotation restricting member 33 configured as described above has a longitudinal insertion fitting portion 332 on the radially outer side of the rotation ring 31 (first ring holding member 321) in the longitudinal direction. The other stoppers 333a and 333b are respectively positioned on the radially inner side of the rotating ring 31 (first ring holding member 321), and the stoppers 333a and 333b are in the recess 310 of the rotating ring 31. The holding shaft 321a is inserted into the shaft insertion hole 331 in the arranged state. Thereby, the rotation restricting member 33 is held by the first ring holding member 321.

  In this held state, the fitting insertion portion 332 of the rotation regulating member 33 is fitted into the rotation regulating member receiving portion 320 of the first ring holding member 321, and the first contact portion 332 a and the first ring holding member 321 are inserted. The first detent portion 321b comes into contact, and the second abutment portion 332b comes into contact with the second detent portion 321c of the first ring holding member 321. Therefore, the rotation restricting member 33 is prevented from rotating around the holding shaft 321a.

  In this state, the rotation restricting member 33 has a width direction along the circumferential direction of the rotation ring 31 (first ring holding member 321), and the first contact stopper 333 a and the first rotation of the rotation ring 31. The first stopper part 311 faces in the circumferential direction, and the second stopper part 333b and the second stopper part 312 of the rotating ring 31 face each other in the circumferential direction.

  Further, in this state, the position of the axis O of the holding shaft 321a in the radial direction of the rotation ring 31 is determined so that the rotation ring 31 in each of the first contact stopper 333a and the second contact stopper 333b of the rotation restricting member 33. It is arrange | positioned so that it may become the same position as the outermost part 334 located in the outermost part of radial direction, or inner side of the outermost part 334.

  In this embodiment, the distance L1 from the center of the rotation ring 31 to the axis O of the holding shaft 321a and the distance L2 from the center of the rotation ring 31 to the outermost part 334 are formed substantially the same. The axial center O of the holding shaft 321a and the outermost portion 334 in the radial direction are formed at substantially the same position.

  The camera shake correction mechanism 3 configured as described above is activated by starting the drive motor 321h from the state shown in FIG. 6 in which the first contact stopper 311 of the rotation ring 31 is stopped by the first contact stopper 333a. When the ring drive gear 321e rotates counterclockwise in FIG. 6 and the rotating ring 31 rotates clockwise (the other direction side), the second contact stop of the rotating ring 31 as shown in FIG. The part 312 is stopped by the second stopper part 333b.

  When the rotating ring 31 is rotated, as shown in FIG. 7, the fixing operation piece 314 of the rotating ring 31 is positioned on the radially inner side of the first ring holding member 321 and the fourth lens group 54. The first ring holding member 321 and the fourth lens group 54 are fixed by entering the gap 7 with the holding part 541c, and the fourth lens group 54 is in a fixed state.

  On the other hand, when the ring drive gear 321e is rotated clockwise in FIG. 7 from the state shown in FIG. 7 and the rotating ring 31 is rotated counterclockwise (one direction), as shown in FIG. It will be in the state by which the 1st to-be-stopped part 311 of the rotation ring 31 was stopped by the 1st to-be-stopped part 333a.

  When the rotating ring 31 rotates, the fixing operation piece 314 of the rotating ring 31 comes out of the gap between the radially outer sandwiching portion 321g of the first ring holding member 321 and the radially inner sandwiching portion 541c of the fourth lens group 54. .

  As a result, the fixation of the first ring holding member 321 and the fourth lens group 54 is released, and the fourth lens group 54 is released from the fixation state. In this state, the fourth lens group 54 is orthogonal to the optical axis direction. It becomes possible to move in the radial direction of the fixed cylinder 4.

  When the fourth lens group 54 is movable in the radial direction of the fixed cylinder 4, camera shake correction is performed. For example, when a current flows through the first coil, the fourth lens group 54 moves in one radial direction of the fixed cylinder 4, and when a current flows through the second coil, the fourth lens group 54 moves to the fixed cylinder 4. Moving in the other direction of the radial direction, camera shake correction is performed.

  Next, the diaphragm device 6 will be described. In this embodiment, the diaphragm device 6 is disposed on the image side of the third lens group 53 as shown in FIG. 1, and adjusts the amount of light transmitted through the third lens group 53.

  The diaphragm device 6 of this embodiment includes a diaphragm blade operating member (rotating member) 61, a first holding member 62 and a second holding member 64 that rotatably hold the diaphragm blade operating member 61, and a plurality (this embodiment). Nine diaphragm blades 63 and a rotating member position detecting device 65 are provided.

  As shown in FIG. 2, the diaphragm blade operation member 61 is formed of a substantially annular body having a light passage hole 610 at the center, and the first holding member 62 and the second holding member in the optical axis direction (XY direction). A plurality of (9 in this embodiment) engagements with which a second engagement shaft 632 of a diaphragm blade 63 described later is engaged with the object-side surface that is disposed between the first holding member 62 and the object-side surface. A hole 611 is provided.

  The diaphragm blade operation member 61 includes a gear portion 612 and a detected piece 613 formed on the outer periphery of the aperture portion 61 at a predetermined distance from the circumferential direction side of the gear portion 612.

  The first holding member 62 has a substantially ring shape made of synthetic resin, and includes a light passage hole 621 at the center. The first holding member 62 has a first receiving portion (first holding member engagement) that receives (engages) a first positioning shaft (first positioning portion) 652a of a detection sensor holder 652 described later on the outer peripheral portion. Part) 622. The first receiving portion 622 is formed in a long hole shape so as to penetrate substantially from the image-side surface of the first holding member 62 to the object-side surface.

  Further, the first holding member 62 has a plurality of engagement grooves 623 (on the image side surface facing the diaphragm blade operation member 61, in which a first engagement shaft 631 of a diaphragm blade 63 described later is slidably engaged. In this embodiment, nine are shown, and only one is shown in FIGS.

  Further, the first holding member 62 includes a fitting insertion portion 624 that is fitted into the second holding member 64 on the outer periphery.

  The 2nd holding member 64 consists of a thing different from the 1st holding member 62, and consists of a metal plate-shaped annular body. The second holding member 64 includes a detected piece loose fitting long hole 641 into which the detected piece 613 is loosely fitted. The detected piece loose fitting long hole 641 has a width that allows the detected piece 613 to be inserted therethrough, and is formed as a long hole having a predetermined length along the circumferential direction.

  Further, the second holding member 64 includes a holder attaching portion 640 for attaching a detection sensor holder 652 of a rotating member position detecting device 65 described later. The holder mounting portion 640 includes an insertion hole (second holding member engagement portion) 641a through which a first positioning shaft 652a of a detection sensor holder 652 described later is inserted (engaged), and a second positioning shaft ( A second receiving hole (second receiving part) 641b for receiving the second positioning part) 652b and two screw holes 641c are provided.

  The insertion hole 641a is a position corresponding to the first receiving portion 622 of the first holding member 62 and has a circular cross section at a position outside the detected piece loose fitting long hole 641 in the radial direction of the second holding member 64. Further, the second holding member 64 is formed so as to penetrate from the image side surface to the object side surface.

  The second receiving hole 641b is formed at a position inside the insertion hole 641a in the radial direction of the second holding member 64 so as to receive the second positioning shaft 652b. In this embodiment, the second receiving hole 641b is formed by a through groove opened to the detected piece loose fitting long hole 641 side, but the second receiving hole 641b is not limited to this form, for example, The hole may be formed in a cross-sectional oblong shape so as to penetrate from the image-side surface of the second holding member 64 to the object-side surface, and at a predetermined depth from the image-side surface of the second holding member 64. It may be a recessed portion that can be changed as appropriate.

  The screw holes 641c are formed on one side and the other side in the circumferential direction of the insertion hole 641a and the second receiving hole 641b.

  The second holding member 64 holds a drive member 643 that drives the diaphragm blade operation member 61. The drive member 643 includes an operation member drive motor 643 a and a drive gear 643 c that meshes with the gear portion 612 of the diaphragm blade operation member 61.

  The operating member driving motor 643a is attached to the image-side surface of the second holding member 64, and the shaft 643b (see FIG. 1) of the operating member driving motor 643a passes through the second holding member 64. It is put in the hole 643d.

  The drive gear 643c is fixedly attached to the distal end portion of the shaft 643b of the operation member drive motor 643a, and thus protrudes from the object-side surface of the second holding member 64.

  The second holding member 64 includes a fitted insertion portion 644 that is inserted into the fitting insertion portion 624 of the first holding member 62 so as to be rotatable and immovable in the radial direction.

  Each of the diaphragm blades 63 includes a plate-like blade body 630 and a first engagement shaft 631 and a second engagement shaft 632 formed at one end of the blade body 630. The blade body 630 is formed so as to be gradually narrowed from one end to the other end, and is disposed between the holding member 62 and the diaphragm blade operation member 61 in the optical axis direction.

  The first engagement shaft 631 protrudes from the objective-side surface, which is the first holding member 62 side, of the blade body 630 to the first holding member 62 side, and is rotatable and slidable in the engagement groove 623 (see FIG. 3). Engage freely.

  The second engagement shaft 632 protrudes from the image side surface on the diaphragm blade operation member 61 side of the blade body 630 to the diaphragm blade operation member 61 side, and is rotatably engaged with the engagement hole 611.

  The plurality of diaphragm blades 63 engaged with the first holding member 62 and the diaphragm blade operation member 61 in this way form an opening (not shown) centered on the optical axis. When the diaphragm blade operation member 61 is rotated in one direction, the diameter of the opening is increased, and when the diaphragm blade operation member 61 is rotated in the other direction, the diameter of the opening is decreased. .

  Next, the rotation member position detection device 65 will be described. The rotating member position detection device 65 includes detection members 651 and 652. The detection member of this embodiment includes a detection sensor 651 and a plate-shaped detection sensor holder 652 that holds the detection sensor 651. The detection sensor 651 includes a photo interrupter or a photo reflector.

  The detection sensor holder 652 includes a plate-shaped holder main body 650, and a first positioning shaft 652a and a second positioning shaft 652b formed integrally with the plate-shaped holder main body 650.

  The holder body 650 includes a sensor holding portion 652c that holds the detection sensor 651, an introduction groove 652d, and a bolt insertion hole 652e, and is attached to the image-side surface of the second holding member 64.

  In this embodiment, the sensor holding portion 652c is a rectangular hole into which the detection sensor 651 is fitted.

  The introduction groove 652d is for introducing the detected piece 613 of the diaphragm blade operation member 61 from the outside into the sensor holding portion 652c, and is formed from the end surface of the detection sensor holder 652 to the sensor holding portion 652c with a predetermined groove width. ing.

  In this embodiment, the bolt insertion holes 652e are formed at two locations of one end and the other end of the detection sensor holder 652, as shown in FIG.

  The first positioning shaft 652a is formed on one side of the sensor holding portion 652c, and is approximately the same as the first receiving portion 622 of the first holding member 62 and the insertion hole 641a of the second holding member 64. The holder body 650 has the same diameter and protrudes toward the second holding member 64 from the object-side surface facing the second holding member 64.

  In addition, the protrusion length L1 of the first positioning shaft 652a from the surface of the holder main body 650 on the objective side is longer than the thickness of the second holding member 64 as shown in FIG. 1, and is inserted into the insertion hole 641a of the second holding member 64. It is inserted and protrudes from the object side surface of the second holding member 64.

  As shown in FIG. 2, the second positioning shaft 652b is formed on the opposite side of the first positioning shaft 652a with the sensor holding portion 652c interposed therebetween, and can be fitted into the second receiving hole 641b of the second holding member 64. The second holding member 64 has a diameter substantially the same as that of the second receiving hole 641 b and protrudes from the object-side surface of the holder body 650 facing the second holding member 64.

  Further, the protrusion length L2 of the second positioning shaft 652b from the object-side surface of the holder body 650 is shorter than the protrusion length L1 of the second positioning shaft 652b as shown in FIG. The thickness of the second holding member 64 is shorter than the thickness of the second holding member 64 so as not to protrude from the object-side surface of the second holding member 64 when it is received in the second receiving hole 641b.

  The diaphragm device 6 configured as described above is assembled as follows, for example. First, the detection sensor holder 652 holding the detection sensor 651 is attached to the second holding member 64. In this attachment, the first positioning shaft 652a of the detection sensor holder 652 is inserted into the insertion hole 641a of the second holding member 64, and the second positioning shaft 652b of the detection sensor holder 652 is the second receiving member of the second holding member 64. It is received in the hole 641b.

  In this state, the detection sensor holder 652 is positioned at the set position of the second holding member 64 by the first positioning shaft 652a and the second positioning shaft 652b. Then, as shown in FIG. 3, the introduction groove 652d of the detection sensor holder 652 is aligned with the detected piece loose fitting long hole 641 of the second holding member 64, and the sensor holding portion 652c and the detected piece are interposed via the introduction groove 652d. The loose fitting long hole 641 communicates, and the detected piece 613 can enter the sensor holding portion 652c.

  Further, in this state, the first positioning shaft 652a is disposed outside the detection sensor 651 in the radial direction of the second holding member 64. Further, the tip of the first positioning shaft 652a inserted through the insertion hole 641a of the second holding member 64 is in a state of protruding from the object side surface of the second holding member 64.

  In this state, the holder fixing bolt 81 (shown in FIG. 2) is passed through the bolt insertion hole 652e and tightened into the screw hole 641c of the second holding member 64, whereby the detection sensor holder 652 is held in the second position. The member 64 is fixed while being positioned at the set position.

  Next, the diaphragm blades 63 are engaged with the diaphragm blade operation member 61 and the first holding member 62, respectively, and the second holding member is engaged with the first receiving portion 622 of the first holding member 62 in the engaged state. The first positioning shaft 652a protruding from the 64 insertion hole 641a is inserted, and the outer portion of the aperture blade operation member 61 and the first holding member 62 are fitted so as not to move in the radial direction (diameter fitting). The first holding member 62 is inserted into the fitting insertion portion 624 of the second holding member 64. In this embodiment, the diaphragm blade operation member 61 and the first holding member 62 are diameter-fitted, but the diaphragm blade operation member 61 and the second holding member 64 may be diameter-fitted.

  In this state, the detection sensor holder 652 is positioned at the set position with respect to the first holding member 62 via the first positioning shaft 652a. In this state, the diaphragm blade operating member 61 is rotatably disposed between the first holding member 62 and the second holding member 64 in the optical axis direction, and the first holding member 62 and the second holding member 64 are arranged. It will be in the state hold | maintained rotatably.

  The plurality of diaphragm blades 63 are rotatable between the first holding member 62 and the diaphragm blade operation member 61 in the optical axis direction so as to be rotatable and slidable with respect to the first holding member 62. It is arranged so as to be rotatable with respect to 61.

  In this state, the first holding member 62 and the second holding member 64 are fixed with bolts (not shown). Further, in a state where the first holding member 62 and the second holding member 64 are fixed, the first holding member 62 and the second holding member 64 are arranged on the image side of the third lens group 53 and are fixed to the fixed cylinder 4 with bolts (not shown).

  Next, the operation of the diaphragm device 6 will be described. From the state shown in FIG. 3, when the drive gear 643c is rotated counterclockwise in FIG. 3 by the operation of the operating member drive motor 643a and the diaphragm blade operating member 61 is rotated in the clockwise direction in FIG. At this time, the detected piece 613 of the diaphragm blade operating member 61 moves through the detected piece loose fitting long hole 641 and moves through the introduction groove 652d.

  Further, when the diaphragm blade operation member 61 rotates in the clockwise direction of FIG. 3, the first engagement shaft 631 of each diaphragm blade 63 slides on the engagement groove 623 of the first holding member 62, and each The diaphragm blade 63 moves to the outside in the radial direction of the first holding member 62 (diaphragm blade operation member 61). During the movement, the diameter of an opening (not shown) formed by the plurality of aperture blades 63 is gradually enlarged.

  Then, as shown in FIG. 4, the opening is maximized when moving to the position of the detection sensor 651 of the rotating member position detecting device 65. Further, when the detected piece 613 moves to the position of the detection sensor 651, the detection sensor 651 detects the detected piece 613, and the diaphragm blades for the first holding member 62 when the openings by the plurality of diaphragm blades 63 are maximized. The position information of the operation member 61 is transmitted to a control unit provided in the lens barrel or the like.

  At that time, the rotating member position detecting device 65 held by the second holding member 64 is positioned at the set position with respect to the first holding member 62 via the first positioning shaft 652a. The position of the diaphragm blade operation member 61 can be accurately detected, and the position of the diaphragm blade 63 can be accurately controlled.

  When the operation gear drive motor 643a is actuated from the state shown in FIG. 4 to rotate the drive gear 643c in the clockwise direction in FIG. 4 and the diaphragm blade operation member 61 in the counterclockwise direction in FIG. At this time, the detected piece 613 of the diaphragm blade operating member 61 moves through the detected piece loose fitting long hole 641, passes through the introduction groove 652 d, and moves away from the rotating member position detecting device 65 as shown in FIG. 3.

  Further, when the diaphragm blade operation member 61 rotates counterclockwise in FIG. 4, the first engagement shaft 631 of each diaphragm blade 63 moves the engagement groove 623 of the first holding member 62 to the opposite side. By sliding, each diaphragm blade 63 moves inward in the radial direction of the first holding member 62 (diaphragm blade operation member 61). During the movement, the diameter of the opening (not shown) formed by the plurality of aperture blades 63 gradually decreases.

  According to the lens barrel having the rotating member position detecting device configured as described above, the first positioning shaft 652a is the second holding member in a state where the detection sensor holder 652 is attached to the second holding member 64. 64, the detection sensor 651 can be arranged more accurately with respect to the second holding member 64 and the first holding member 62.

  Further, since the second holding member 64 is made of metal, the second holding member 64 has a large rigidity, and the detection sensor holder 652 can be reliably held. In addition, the second holding member 64 can be thinned, and the entire rotation member position detecting device can be thinned in the optical axis direction.

  Further, since the second holding member 64 holds the driving member 643 that drives the diaphragm blade operation member 61 to rotate, the diaphragm blade operation member 61 is easily driven to rotate with respect to the second holding member 64, and is manufactured. Can be made easy. In addition, since the second holding member 64 holds the drive member 643, a separate member for holding the drive member 643 can be eliminated, and the number of parts can be reduced.

  In the above-described embodiment, the rotating member position detecting device 65 is used as a part of the lens barrel diaphragm device. However, the rotating member position detecting device 65 is not limited to this embodiment, and can be used as appropriate in various devices. .

  In the above embodiment, the aperture blade 63 is configured to always form an opening. However, for example, when the aperture blade 63 also serves as a shutter, the aperture is closed and the diameter of the aperture is increased from the closed state. It may be in the form and can be changed as appropriate.

  In the above embodiment, the first positioning shaft 652a is provided in the detection sensor holder 652, and the first engaging portion is provided in each of the second holding member 64 and the first holding member 62. For example, the first positioning shaft 652a is provided in any one of the detection sensor holder 652, the second holding member 64, and the first holding member 62, and the first engaging portion is the remaining one. May be provided and can be changed as appropriate.

  In the above embodiment, the second positioning shaft 652b is provided in the detection sensor holder 652 and the second engaging portion is provided in the second holding member 64. For example, the second positioning shaft 652b is provided in the second holding member. The second engagement portion may be provided in the detection sensor holder 652 and can be changed as appropriate.

  Moreover, in the said embodiment, although the detection sensor 651 and the detection sensor holder 652 are comprised by the different body, they may be integrally formed and can be changed suitably.

DESCRIPTION OF SYMBOLS 1 Lens barrel 2 Lens barrel main body 3 Shake correction mechanism part 4 Fixed cylinder 6 Aperture apparatus 61 Aperture blade operation member (rotating member)
62 1st holding member 63 Diaphragm blade 64 2nd holding member 65 Rotating member position detection apparatus 651 Detection sensor 652 Detection sensor holder 652a 1st positioning shaft (1st positioning part)
652b Second positioning shaft (second positioning portion)

Claims (7)

A detecting member for detecting a position of the rotating member held rotatably by the first holding member and the second holding member attached to each other with respect to the first holding member;
Any one of the first holding member, the second holding member, and the detection member includes a first positioning portion that positions the first holding member, the second holding member, and the detection member. ,
The remaining one other than the one includes a first engagement portion that engages with the first positioning portion,
Either one of the detection member and the second holding member includes a second positioning portion that positions the detection member and the second holding member,
The rotating member position detecting device according to any one of the above, wherein the other has a second engaging portion that engages with the second positioning portion. The first engaging portion includes a first holding member engaging portion formed on the first holding member, and a second holding member engaging portion formed on the second holding member,
The second engaging portion is formed on the second holding member,
The detection member includes a detection sensor and a detection sensor holder that holds the detection sensor,
Each of the first and second positioning portions is a shaft protruding from the detection sensor holder,
The first positioning portion has a longer protruding length from the detection sensor holder than the other and is engaged with each of the first holding member engaging portion and the second holding member engaging portion. ,
The rotating member position detecting device according to claim 1, wherein the first positioning portion is engaged with the second engaging portion. The second holding member is a plate-like annular body,
The first positioning portion is arranged on a radially outer side of the detection sensor in the second holding member in a state where the detection sensor holder is attached to the second holding member. 3. The rotating member position detecting device according to 2.   The rotating member position detecting device according to claim 1, wherein the rotating member is fitted to the first holding member so as not to move in a radial direction.   The rotating member position detecting device according to claim 1, wherein the second holding member holds a driving member that rotates the rotating member.   A lens barrel comprising the rotating member position detecting device according to any one of claims 1 to 5. A plurality of aperture blades engaged with the rotating member and the first holding member;
The plurality of diaphragm blades are arranged so as to form openings by the plurality of diaphragm blades,
Each of the diaphragm blades has a diameter of the opening that increases according to the rotation of the rotating member in one direction, and a diameter of the opening that decreases in response to the rotation of the rotating member in the other direction. The lens barrel according to claim 6, wherein the lens barrel is movably engaged with each of the rotating member and the first holding member so as to close the opening.