JP2014052420A - Optical means support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure that is excellent in workability of a tilt adjustment with a simplified configuration regarding optical means to be inserted/detached to/from an optical axis of an imaging optical system.SOLUTION: An optical means support structure comprises: an insertion/detachment frame that is pivotally supported by a rotary shaft in parallel with an optical axis of the imaging optical system with respect to a base member and causes optical means to be inserted/detached/rotated on the optical axis; a first pressing member that presses the insertion/detachment frame to an insertion position; a stopper on the base member that determines the insertion position with the insertion/detachment frame brought into contact; a support ring that supports the base member inside tiltably to the optical axis; a second pressing member that presses the base member in the support ring in the optical direction; and a plurality of adjustment screws that is screwed to the support ring and supported advanceably and retreatably to and from the optical axis direction, comes into contact with the base member from an opposite side of an action direction of a pressing force of the second pressing member to cause the base member to advance/retreat to and from the optical direction, and thereby changes a tilt angle of the base member. The plurality of adjustment screws are arranged separately in one and the other of an area across a plane surface passing through the stopper and the rotary shaft of the insertion/detachment frame.

Description

  The present invention relates to a support structure for optical means constituting an imaging optical system, and more particularly to a support structure provided with a tilt adjustment mechanism for optical means.

  Many mechanisms for adjusting the tilt of optical means such as a lens with respect to the optical axis of an imaging optical system are known. In Japanese Patent Laid-Open No. 2004-260, tilt adjustment of a retracting lens group is performed in a lens barrel that retracts a part of a plurality of lens groups to a position that deviates from the optical axis and shortens the length when retracted (stored). The mechanism is described. Specifically, a lens holding frame that holds a fifth group unit that is positioned closest to the image plane among a plurality of lens groups is pivotally supported with respect to a support plate via a rotating arm portion. When the lens barrel is retracted, the rotation of the cam ring is transmitted to the rotating arm portion to retract the lens holding frame from the position on the optical axis. The support plate is urged in a direction away from the side plate located rearward (image plane side) by a coil spring, and is fastened to the side plate by screws provided at three corners of the four corners of the periphery of the support plate. ing. By changing the tightening amount of these three screws, the inclination of the support plate changes and tilt adjustment is performed.

  In the zoom lens barrel of Patent Document 2, the retractable lens frame that holds the retractable lens group that can be retracted from the optical axis is rotatable about the eccentric shaft inside the retractable lens group support frame that is movable in the optical axis direction. I support it. The retractable lens frame is urged to rotate in the insertion direction on the optical axis, and the stopper arm provided on the retractable lens frame is brought into contact with the stopper provided on the retractable lens group support frame, so that in the shooting state. The insertion position of the retractable lens frame to be used is determined. When the retractable lens group support frame is retracted in the optical axis direction from the shooting state to the retracted state, the position control projection provided at the rear abuts the retractable lens frame, and the retractable lens frame resists the urging force. Rotate in the retracting direction from the axis.

JP 2012-53412 A Japanese Patent No. 3771909

  In both Patent Document 1 and Patent Document 2, the holding frame of the retractable lens group is moved in the insertion / removal direction by rotation about a rotation axis whose axis is oriented in a direction parallel to the optical axis of the imaging optical system. Yes. A minimum clearance is required between the retractable lens group holding frame and the rotation axis to enable rotation, and the inclination (falling) of the retractable lens group is caused by an accuracy error of parts. Since there is a possibility, it is desirable to provide a mechanism for adjusting the inclination of the retractable lens group. In particular, as in Patent Document 2, in the configuration in which the holding frame of the retractable lens group is brought into contact with the stopper with an urging force and the insertion position is determined, it intersects the rotation axis of the retaining frame of the retractable lens group and the plane passing through the stopper. It tends to be inclined in the direction. There has been a demand for a support structure for optical means that can be easily adjusted with a simple configuration under such a condition that the inclination tends to occur in a specific direction.

  The present invention has been made in view of the above problems, and is a support that is excellent in workability of tilt adjustment with a simple configuration with respect to the insertion / removal optical means that is inserted into and removed from the optical axis of the imaging optical system. The purpose is to provide a structure.

  The optical means supporting structure of the present invention holds the optical means and is supported so as to be rotatable about a rotation axis substantially parallel to the optical axis direction of the imaging optical system with respect to the base member, and the optical means is supported by the imaging optical system. An insertion position for insertion on the optical axis, and an insertion / removal frame that can be rotated to a removal position for detaching the optical means from the optical axis of the imaging optical system; A first urging member; a stopper provided on the base member for determining the insertion position by bringing the insertion / removal frame into contact with the urging force of the first urging member; tiltable with respect to the optical axis of the imaging optical system A support ring for supporting the base member therein; a second biasing member for applying a biasing force in the optical axis direction to the base member in the support ring; The optical axis is supported by screwing and comes into contact with the base member from the side opposite to the direction of application of the urging force of the second urging member. A plurality of adjustment screws that change the inclination angle of the base member with respect to the optical axis by advancing and retreating in the direction, the plurality of adjustment screws having a plane passing through the stopper and the rotation axis of the insertion / removal frame. It is characterized by being divided into one and the other region between which it is sandwiched.

  It is preferable to have a flange portion inside the support ring and to form a plurality of screw holes through which the plurality of adjustment screws are screwed. The base member is preferably in a state where the positioning by the adjusting screw is released, and the movement limit of the second urging member in the urging direction can be determined by contacting a part of the flange portion.

  The number of adjustment screws can be arbitrarily selected, but the configuration can be simplified by using two adjustment screws.

  By configuring the base member as follows, in addition to the insertion / removal operation by the insertion / removal frame, it is possible to perform the image stabilization operation for image blur correction. First, it has a fulcrum part that contacts the fulcrum contact part provided on the inner peripheral side of the support ring by the urging force of the second urging member, and a plurality of screw contact parts that a plurality of adjustment screws contact, A tilting member is provided that changes the tilt angle with respect to the optical axis with the fulcrum portion as a fulcrum by moving the adjustment screw back and forth in the optical axis direction. Then, the optical axis shift frame that pivotally supports the insertion / removal frame by the rotation shaft is movably supported along a plane orthogonal to the optical axis with respect to the tilting member.

  It is preferable that the fulcrum contact part of the support ring and the fulcrum part of the tilting member are positioned in the vicinity of the plane passing through the stopper and the rotation shaft of the insertion / removal frame.

  The tilting member is composed of two tilting members that are coupled to each other at the front and back in the optical axis direction of the optical axis shift frame, and between the outer peripheral part of one tilting member and the inner peripheral surface of the support ring, A tilting support portion that supports the tilting member so as to be tiltable with respect to the support ring may be provided, and a fulcrum portion and a screw contact portion may be formed on the other tilting member. In this case, one tilting member holds a part of the driving means that applies thrust to the base member along a plane orthogonal to the optical axis, and the detection member that detects the moving position of the optical axis shift frame by the driving means is used as the other detecting member. The tilting member can be held.

  Furthermore, a shutter capable of opening and closing an optical path passing through the optical means may be supported on one tilting member having a support protrusion.

  The optical means held in the insertion / removal frame is preferably a lens group.

  The means for operating the insertion / removal frame in the present invention can be selected arbitrarily. For example, the support ring is a movable member in the optical axis direction of the imaging optical system, and the insertion / removal frame is moved by moving the support ring in the optical axis direction. It is preferable to provide a detachment driving means for rotating from the insertion position to the detachment position against the urging force of the first urging member.

  In the optical means support structure of the present invention, a plane is set that passes through the rotation axis in the insertion / removal frame that holds the optical means that is inserted into and removed from the optical axis of the imaging optical system and the stopper that determines the insertion position. A plurality of adjustment screws for adjusting the inclination of the base member that supports the insertion / removal frame are dispersedly arranged in one and the other region across the frame. With this configuration, it is possible to adjust the inclination of the optical means to be inserted / removed efficiently and accurately.

It is a sectional side view of the accommodation (collapse) state which shows one Embodiment of the zoom lens barrel to which this invention is applied. FIG. 3 is a side sectional view of the zoom lens barrel in the extended (photographed) state. It is a disassembled perspective view of the zoom lens barrel. It is a front perspective view of an anti-vibration lens block and an image sensor holder. It is a front perspective view of the state which removed the internal structure from the 3rd group support ring which constitutes a vibration proof lens block. It is the front perspective view which decomposed | disassembled the shutter unit, the anti-vibration frame, the sensor holder, and the sensor pressing plate. It is a front perspective view of the state which removed the 3rd group frame and the permanent magnet from the vibration isolating frame. It is a back perspective view of a vibration proof lens block. It is a back perspective view of the state where the internal structure was removed from the 3rd group support ring which constitutes an anti-vibration lens block. It is a rear view of an anti-vibration lens block. It is a rear view of the tilt unit which remove | excluded the 3 group support ring from the anti-vibration lens block. It is a sectional side view of a vibration proof lens block. It is a sectional side view of the anti-vibration lens block in a state where the tilt adjustment of the tilt unit is performed. It is a sectional side view of the anti-vibration lens block in a state where the tilt adjustment of the tilt unit is performed.

  The overall configuration of the retractable zoom lens barrel 10 will be described mainly with reference to FIGS. The imaging optical system of the zoom lens barrel 10 has a first lens group LG1, a second lens group LG2, a shutter S, and a third lens group (optical means) in order from the object (subject) side in the shooting (protracted) state of FIG. ) LG3, a fourth lens group LG4, a filter 25, and an image sensor 62 are provided. This imaging optical system is a zoom optical system having a variable focal length, and moves the first lens group LG1, the second lens group LG2, and the third lens group LG3 along a photographing optical axis O of the optical system along a predetermined locus. Do zooming with. Further, focusing is performed by moving the fourth lens group LG4 along the photographing optical axis O. In the following description, the optical axis direction means a direction parallel to the imaging optical axis O of the imaging optical system, the front means the front in the optical axis direction (subject side), and the rear means the rear in the optical axis direction (image). Surface side).

  The zoom lens barrel 10 includes a cylindrical housing 22 as a fixing member. The image sensor holder 21 is fixed to the rear portion of the housing 22, and the filter 25 and the image sensor 62 are supported in the sensor holding portion 21 a on the front surface of the image sensor holder 21.

  The fourth lens group LG4 is held by the fourth group frame 51. The fourth group frame 51 has a pair of guide arms 51a and 51b projecting in the outer diameter direction, and a guide shaft provided at the tip of one guide arm 51a is fixed in the housing 22 and extends in the optical axis direction. The tip end of the other guide arm 51b is slidably fitted in a long groove 22a formed in the inner peripheral surface of the housing 22 in the optical axis direction. Accordingly, the fourth group frame 51 is supported so as to be able to move straight in the optical axis direction with respect to the housing 22. The fourth group frame 51 is driven back and forth in the optical axis direction by an AF motor (not shown).

  A third cylinder 15 is supported inside the housing 22. A peripheral surface gear 15 a that meshes with a zoom gear (not shown) supported in the housing 22 is formed on the outer peripheral surface of the third tube 15, and the zoom gear is driven to rotate by the zoom motor 150 and rotates to the third tube 15. Transmit power. An outer surface helicoid 15 b is formed on the outer surface of the third cylinder 15 in the same region as the peripheral gear 15 a, and the outer surface helicoid 15 b is screwed to the inner surface helicoid 22 b of the housing 22. When the zoom gear is rotationally driven by the zoom motor 150 from the retracted (collapsed) state of FIG. 1, the third cylinder 15 moves forward in the optical axis direction while rotating by the guidance of the inner surface helicoid 22b.

  A rectilinear guide ring 14 is supported inside the third cylinder 15. A linear groove 22c in the optical axis direction is formed on the inner peripheral surface of the housing 22, and the linear guide ring 14 is slidably engaged with the linear guide groove 14c in the optical axis direction. You are guided straight ahead. The rectilinear guide ring 14 is also slidably engaged with a circumferential groove 15c formed on the inner peripheral surface of the third cylinder 15 with the photographing optical axis O as the center, so that the third cylinder 15 is slidably engaged. It moves together with the third cylinder 15 in the optical axis direction while permitting the relative rotation of 15.

  The straight guide ring 14 is formed with a through guide groove 14c penetrating the inner peripheral surface and the outer peripheral surface. The penetration guide groove 14 c is a groove that is inclined with respect to the photographing optical axis O, and an outer diameter protrusion 11 a provided on the outer peripheral surface of the cam ring 11 is slidably fitted therein. The outer diameter protrusion 11a is further slidably engaged with a rotation transmission groove 15d formed in the inner peripheral surface of the third cylinder 15 in the optical axis direction. It is rotated together with the three cylinders 15. The cam ring 11 is guided in the through guide groove 14 c and is advanced and retracted in the optical axis direction with respect to the third cylinder 15 and the rectilinear guide ring 14 while rotating.

  Linear grooves 14 d and 14 e extending in the optical axis direction are formed on the inner peripheral surface of the rectilinear guide ring 14. The straight guide protrusion 8a of the third group support ring (support ring) 8 is slidably engaged with the linear groove 14d, and the third group support ring 8 is guided straight in the optical axis direction via the straight guide ring 14. Has been. The rectilinear guide protrusion 13a of the second cylinder 13 is slidably engaged with the linear groove 14e, and the second cylinder 13 is also guided linearly in the optical axis direction via the rectilinear guide ring 14. A rotation guide projection 13b provided on the inner peripheral surface of the second cylinder 13 is slidably engaged with a circumferential groove 11b formed on the outer peripheral surface of the cam ring 11, and the second cylinder 13 is a cam. The ring 11 moves together with the cam ring 11 in the optical axis direction while allowing the relative rotation of the ring 11.

  The third lens group LG 3 is supported by the third group frame 5, and the third group frame 5 is supported in the third group support ring 8 via a vibration isolation frame (base member, optical axis shift frame) 301. The anti-vibration frame 301 is supported so as to be movable along a plane substantially orthogonal to the photographing optical axis O in the third group support ring 8, and the third group frame 5 is substantially orthogonal to the photographing optical axis O with respect to the anti-vibration frame 301 It is supported so as to be movable along a flat surface. A shutter unit (base member, tilting member) 100 having a built-in shutter S is also supported in the third group support ring 8. The third group support ring 8 and its internal structure constitute an anti-vibration lens block 80, the details of which will be described later.

  The third group support ring 8 includes a rectilinear guide key 8b extending in the optical axis direction, and a linear groove in the optical axis direction formed on the inner peripheral surface of the second group support ring 3 is slidably engaged with the rectilinear guide key 8b. Match. By this engagement, the second group support ring 3 is guided in a straight line through the third group support ring 8 in the optical axis direction. In the second group support ring 3, the second lens group LG2 is fixedly supported.

  A linear groove 13c extending in the optical axis direction is formed on the inner peripheral surface of the second cylinder 13, and the straight guide protrusion 12a of the first cylinder 12 is slidably engaged with the linear groove 13c. One cylinder 12 is guided in a straight line through the second cylinder 13 in the optical axis direction. A first lens group LG <b> 1 is supported inside the first cylinder 12 via a first group support ring 2.

  The cam follower N2 provided on the outer peripheral surface of the second group support ring 3 is engaged with the second group control cam groove M2 formed on the inner peripheral surface of the cam ring 11, and the third group is also formed on the inner peripheral surface of the cam ring 11. A cam follower N3 provided on the outer peripheral surface of the third group support ring 8 is engaged with the control cam groove M3. Since the second group support ring 3 and the third group support ring 8 are respectively guided in the straight direction in the optical axis direction, when the cam ring 11 rotates, the second group support ring is supported according to the shapes of the second group control cam groove M2 and the third group control cam groove M3. The ring 3 and the third group support ring 8 are moved along a predetermined locus in the optical axis direction, and the positions of the second lens group LG2 and the third lens group LG3 are controlled.

  The first cylinder 12 has a cam follower N1 protruding in the inner diameter direction, and this cam follower N1 is slidably fitted in a first group control cam groove M1 formed on the outer peripheral surface of the cam ring 11. Since the first cylinder 12 is guided linearly in the optical axis direction, when the cam ring 11 rotates, the first cylinder 12 is moved in the optical axis direction along a predetermined locus according to the shape of the first group control cam groove M1, and the first cylinder 12 is moved. The position of the lens group LG1 is controlled.

  A lens barrier mechanism 101 is provided at the front end of the first cylinder 12. The lens barrier mechanism 101 includes a barrier support ring 102 having an opening 102a in the center, and is supported between the barrier support ring 102 and a rear barrier drive ring 103 by a rotating shaft whose axis is directed in the optical axis direction. Each pair of barrier blades 104 and 105 is provided. The barrier blade 104 and the barrier blade 105 are opened and closed in conjunction with the forward / reverse rotation of the barrier drive ring 103 around the photographing optical axis O, and the barrier blade 104 and the barrier blade 105 are closed in the retracted state of FIG. In the photographing state of FIG. 2, the barrier blade 104 and the barrier blade 105 are opened.

  In the zoom lens barrel 10 described above, various engagement portions for performing linear advance guidance and rotation transmission between members are provided at a plurality of positions in the circumferential direction so as to obtain stable engagement support performance. It has been. For example, three cam grooves M1, M2, M3 on the cam ring 11 are formed at substantially equal intervals in the circumferential direction. Similarly, the cam followers N1, N2, N3 that engage with the cam grooves M1, M2, M3 are also circumferential. Three are provided at substantially equal intervals. Although an individual description is omitted, the optimal number and arrangement of the engaging portions other than the cam groove and the cam follower are selected in order to prevent tilting and perform stable support and sliding.

  The zoom lens barrel 10 having the above structure operates as follows. In the retracted state shown in FIG. 1, when the main switch provided in the image pickup apparatus on which the zoom lens barrel 10 is mounted is turned on, the zoom motor 150 is driven in the lens barrel feeding direction, the zoom gear rotates, and the third cylinder 15 is guided by the inner surface helicoid 22b of the housing 22 and rotated forward. The rectilinear guide ring 14 moves straight forward together with the third cylinder 15. At this time, the cam ring 11 to which a rotational force is applied from the third cylinder 15 has a lead structure (penetration guide groove 14 c) provided between the linear movement of the linear guide ring 14 and the linear guide ring 14. And the movement by the outer diameter protrusion 11a).

  When the cam ring 11 rotates, on the inner side, the third group support ring 8 guided linearly by the straight guide ring 14 is moved along a predetermined locus in the optical axis direction by the relationship between the cam follower N3 and the third group control cam groove M3. The second group support ring 3 guided linearly through the third group support ring 8 is moved along a predetermined locus in the optical axis direction by the relationship between the cam follower N2 and the second group control cam groove M2. When the cam ring 11 rotates, the first cylinder 12 guided linearly through the linear guide ring 14 and the second cylinder 13 on the outer side of the cam ring 11 depends on the relationship between the cam follower N1 and the first group control cam groove M1 in the optical axis direction. Is moved along a predetermined trajectory.

  That is, the amount of extension of the first lens group LG1, the second lens group LG2, and the third lens group LG3 from the lens barrel storage state is the amount of forward movement of the cam ring 11 relative to the housing 22, and the first amount relative to the cam ring 11, respectively. It is determined as the sum of the cam feed amount of the cylinder 12 (the first group support ring 2), the second group support ring 3, and the third group support ring 8 (anti-vibration unit 26). Zooming is performed by moving the first lens group LG1, the second lens group LG2, and the third lens group LG3 on the photographing optical axis O while changing the air distance between them. When the lens barrel is extended from the housed state of FIG. 1, the wide end is first extended, and when the zoom motor 150 is further driven in the lens barrel extending direction, the tele end is extended. When the main switch is turned off, the zoom motor 150 is driven in the lens barrel retracting direction, and the zoom lens barrel 10 performs a retracting operation opposite to the above-described feeding operation, resulting in the retracted state of FIG.

  Further, when the photographing state is from the wide end to the tele end, the fourth group frame 51 supporting the fourth lens group LG4 is photographed by driving the AF motor according to the subject distance information obtained by the distance measuring means. Moving along the optical axis O performs focusing.

  Apart from the overall operation of the zoom lens barrel 10 described above, the third lens group LG3 in the anti-vibration lens block 80 is movable along a plane orthogonal to the photographing optical axis O. Next, the detailed structure of the anti-vibration lens block 80 will be described. As will be described later, the anti-vibration lens block 80 includes a mechanism for adjusting the inclination of the optical axis of the third lens group LG3. However, the definition of the direction using the photographing optical axis O in the following description is defined as imaging optics. This is based on a state in which the optical axis of the entire system and the optical axis of the third lens group LG3 are parallel.

  As shown in FIGS. 5 to 14, the anti-vibration lens block 80 includes a lens unit 81 that supports the third lens group LG3, a shutter unit 100 that supports the shutter S, and the third lens group LG3 with respect to the photographing optical axis O. The separation drive lever 305 for performing the insertion / removal operation is provided in the third group support ring 8. The lens unit 81 includes a third group frame (insertion / removal frame) 5 that directly supports the third lens group LG3, a vibration isolation frame 301 that pivotally supports the third group frame 5, and the vibration isolation frame 301 along an optical axis orthogonal plane. A sensor holder (base member, tilting member) 304 that is movably supported, and a sensor pressing plate 308 that is attached to the sensor holder 304. The third group support ring 8 has a cylindrical portion 8 c surrounding the photographing optical axis O, and the shutter unit 100 and the sensor holder 304 are supported by being coupled to the inside of the cylindrical portion 8 c, and between the shutter unit 100 and the sensor holder 304. The vibration isolation frame 301 is movably held at the position in the optical axis direction.

  As shown in FIG. 6, the shutter unit 100 has a photographing opening 100b penetrating in the optical axis direction at the center of a shutter housing 100a incorporating the shutter S, and the shutter S is driven by a built-in shutter actuator to open the photographing opening 100b. Open and close. On the outer peripheral surface of the shutter housing 100a, there are three engagement grooves 100c (two are shown in FIG. 6) at different positions in the circumferential direction, and an engagement protrusion 100d protruding on the engagement groove 100c. Is provided. A flexible substrate 90 is extended from the shutter unit 100. The flexible substrate 90 is connected to a control substrate (not shown), and a drive signal is transmitted to the shutter actuator and power is supplied through the flexible substrate 90.

  As shown in FIG. 6, the sensor holder 304 has a holder main body 304 a made of a C-shaped open frame that surrounds the photographing optical axis O and is opened without a part of the circumferential direction being connected. The three front arm portions 304b projecting forward from the holder main body portion 304a in the optical axis direction are formed with different circumferential positions. Each front arm portion 304b is formed with an engaging recess 304c near the tip. The sensor holder 304 is coupled to the shutter unit 100 by engaging the three front arm portions 304b with the engagement grooves 100c and engaging the engagement recesses 304c with the engagement protrusions 100d. Three ball contact surfaces 304d, which are smooth flat surfaces orthogonal to the photographing optical axis O, are formed on the front surface side of the holder main body 304a, and two movement restrictions are provided in the vicinity of the two ball contact surfaces 304d on both sides. A protrusion 304e is provided so as to protrude forward. Three spring hooking projections 304f are projected from the outer peripheral surface of the holder main body 304a at circumferential positions substantially corresponding to the three ball contact surfaces 304d.

  The vibration isolation frame 301 held between the shutter unit 100 and the sensor holder 304 has an outer peripheral shape in which the frame main body 301a faces the inner peripheral surface of the cylindrical portion 8c of the third group support ring 8 with a predetermined clearance. Therefore, movement in the direction perpendicular to the photographing optical axis O is allowed in the cylindrical portion 8c. On the rear surface side of the frame main body 301a, three ball support holes 301b are formed at positions facing the three ball contact surfaces 304d of the sensor holder 304. 6 and 7 show the back side of the ball support hole 301b. As shown in FIG. 12 to FIG. 14, each ball support hole 301b is a bottomed recess opened rearward, and is formed by a ball contact surface 301c and a ball contact surface 304d which are bottom surfaces of the ball support hole 301b. A guide ball 302 which is a spherical rolling element is sandwiched between the opposing front and rear surfaces in the optical axis direction. Similar to the ball contact surface 304d, the ball contact surface 301c is also a smooth plane orthogonal to the photographing optical axis O. The guide ball 302 is loosely fitted to the ball support hole 301b in the direction orthogonal to the optical axis, and abuts against the inner wall of the ball support hole 301b when the guide ball 302 is located near the center of the ball support hole 301b. do not do.

  Three spring hooking protrusions 301d are provided at different positions in the circumferential direction on the outer periphery of the frame main body 301a of the anti-vibration frame 301. Each spring hooking protrusion 301d and each spring hooking protrusion 304f provided on the sensor holder 304 A total of three tension springs 303 are stretched between them. The anti-vibration frame 301 is urged in the direction (rearward) toward the sensor holder 304 by the urging force of the three tension springs 303, and the three ball contact surfaces 301 c are brought into contact with the three guide balls 302. The rearward movement of the vibration isolation frame 301 is restricted. In this state, each ball contact surface 301c is in point contact with the corresponding guide ball 302, and the point contact portion is brought into sliding contact (or the guide ball 302 contacts the inner wall of the ball support hole 301b). The anti-vibration frame 301 is freely movable in a direction orthogonal to the photographing optical axis O while the guide ball 302 is rolled when not in contact.

  The vibration isolation frame 301 is also formed with two movement restricting holes 301e through which the two movement restricting protrusions 304e provided on the sensor holder 304 are inserted in the optical axis direction. Each movement restricting hole 301e has a rectangular inner surface shape that is generally square in a plane orthogonal to the photographing optical axis O. In the drawing, one diagonal direction of the inner wall of each movement restriction hole 301e in the plane orthogonal to the optical axis is represented by the X axis, and the other diagonal direction is represented by the Y axis. 10 and 11, a plane passing through the photographic optical axis O and along the Y axis is shown as a virtual plane PY, and a plane passing through the photographic optical axis O and along the X axis is shown as a virtual plane PX. The anti-vibration frame 301 moves freely with respect to the shutter unit 100 and the sensor holder 304 within a plane orthogonal to the photographing optical axis O within a range until the movement restriction protrusion 304e comes into contact with the inner surface of the movement restriction hole 301e. be able to.

  The vibration isolation frame 301 is a voice coil motor including two permanent magnets (drive means) 311 and 312 supported by the vibration isolation frame 301 and two coils (drive means) 313 and 314 supported by the shutter unit 100. Driven. As shown in FIGS. 6 and 7, the anti-vibration frame 301 has a pair of magnet holding portions 301f and 301g formed between the three ball support holes 301b, and is permanently attached to one magnet holding portion 301f. The magnet 311 is held, and the permanent magnet 312 is held by the other magnet holding portion 301g. The shapes and sizes of the permanent magnet 311 and the permanent magnet 312 are substantially the same, are each formed into an elongated rectangular thin plate shape, and are arranged in a symmetrical relationship with respect to the virtual plane PY shown in FIGS. 10 and 11. More specifically, each of the permanent magnet 311 and the permanent magnet 312 is divided by magnetic boundary lines Q1 and Q2 (shown by alternate long and short dash lines in FIGS. 7, 10 and 11) passing through the approximate center of the short direction and facing the long direction. One of the halved regions is the N pole and the other is the S pole, and the magnetic boundary line Q1 of the permanent magnet 311 and the magnetic boundary line Q2 of the permanent magnet 312 are above the Y-axis direction (the third group frame 5 described later). From the insertion position side) toward the lower side (the separation position side of the third group frame 5 to be described later). The inclination angle of the magnetic force boundary line Q1 of the permanent magnet 311 and the magnetic force boundary line Q2 of the permanent magnet 312 with respect to the virtual plane PY is set to about 45 degrees forward and backward. That is, the permanent magnet 311 and the permanent magnet 312 have a relationship in which their longitudinal directions (magnetic boundary lines Q1, Q2) are substantially orthogonal.

  As shown in FIGS. 6 and 9, the two coils 313 and 314 are fixed to the rear surface side of the shutter housing 100a. Each of the coil 313 and the coil 314 is an air-core coil having a pair of substantially parallel long side portions and a pair of curved portions connecting the long side portions, and the shape and size thereof are substantially the same. When supported on the rear surface side of the shutter housing 100a, the major axis direction of the coil 313 is substantially parallel to the magnetic force boundary line Q1 of the permanent magnet 311 and the major axis direction of the coil 314 is aligned with the magnetic force boundary line Q2 of the permanent magnet 312. It becomes almost parallel. The coil 313 and the coil 314 are energized and controlled by a control circuit on the control board to which the flexible board 90 is connected.

  In the voice coil motor having the above configuration, the coil 313 and the permanent magnet 311 are opposed to each other in the optical axis direction. When the coil 313 is energized, the magnetic force boundary line Q1 ( A thrust in a direction substantially orthogonal to the long axis direction line of the coil 313 acts. The direction in which this thrust acts is indicated by an arrow F1 in FIGS. Further, the coil 314 and the permanent magnet 312 are opposed to each other in the optical axis direction. When the coil 314 is energized, a magnetic force boundary line Q2 of the permanent magnet 312 (long axis direction line of the coil 314) in a plane orthogonal to the photographing optical axis O. ) Acts in a direction substantially orthogonal to. The direction in which this thrust acts is indicated by an arrow F2 in FIGS. The direction of action F1 and F2 of these thrusts is in a relationship intersecting at an angle of about 45 degrees with respect to both the X axis and the Y axis, and is orthogonal to the photographing optical axis O by energization control to the coils 313 and 32. The anti-vibration frame 301 can be moved to an arbitrary position within the plane. As described above, the movement range is restricted by the inner surface of the movement restriction hole 301e coming into contact with the movement restriction protrusion 304e.

  As shown in FIG. 6, a part of the flexible substrate 90 constitutes a sensor support plate 90 a that supports a pair of magnetic sensors (hall sensors, drive means) 315 and 316. Outputs from the magnetic sensors 315 and 316 are transmitted to the control circuit through the flexible substrate 90. The sensor support plate 90 a is routed around the rear part of the sensor holder 304. Two sensor holding portions 304g and 304h are formed on the sensor holder 304 between the three ball contact surfaces 304d and the three spring hooking projections 304f. The sensor holding portions 304g and 304h are concave portions that open toward the rear in the optical axis direction. The magnetic sensor 315 is fitted and positioned from the rear with respect to the sensor holding portion 304g, and the magnetic sensor with respect to the sensor holding portion 304h. 316 is fitted and positioned from behind.

  A sensor pressing plate 308 is attached to the sensor holder 304 from the rear. The sensor pressing plate 308 is made of a metal plate material, and a pair of positioning holes 308 a that engage with a pair of positioning projections 304 i (FIGS. 10 and 11) provided on the rear surface of the sensor holder 304, and a pair provided in the sensor holder 304. And a pair of plate-like support pieces 308b that are engaged with the locking projections 304j (FIGS. 10 and 11) and are prevented from coming out backward. The sensor pressing plate 308 supported at a predetermined position with respect to the sensor holder 304 by these engagement relationships is in contact with two cantilever shapes having one end as a free end at a position corresponding to the magnetic sensors 315 and 316. It has a piece 308c and abuts against the sensor support plate 90a from behind while elastically deforming each abutment piece 308c. The pressing force of the two contact pieces 308c prevents the sensor support plate 90a from being lifted with respect to the sensor holder 304, and the magnetic sensors 315 and 316 are stably held in the sensor holding portions 304h and 304i, respectively. In this holding state, the magnetic sensor 315 faces the rear of the permanent magnet 311, and the magnetic sensor 316 faces the rear of the permanent magnet 312. The magnetic sensors 315 and 316 can detect the drive position of the vibration isolation frame 301 by converting the change in the magnetic field generated by the permanent magnets 311 and 312 that are opposed to each other into an electrical signal and outputting it.

  On the anti-vibration frame 301, the third group frame 5 is supported so as to be rotatable (swingable) about a rotation shaft 35 parallel to the photographing optical axis O. As shown in FIG. 7, both ends of the rotation shaft 35 are supported by a shaft support portion 301 h provided on the vibration isolation frame 301 and a retaining member 36 fixed to the vibration isolation frame 301 by a fixing screw 37. The third group frame 5 connects the lens holding cylinder part 5a holding the third lens group LG3, the shaft hole part 5b having a shaft hole through which the rotation shaft 35 is inserted, and the lens holding cylinder part 5a and the shaft hole part 5b. An arm 5c is provided. The third group frame 5 is located between the solid line in FIGS. 2, 8, 9, 10, and 11, the insertion position shown in FIGS. 12 to 14, and the separation position shown in the two-dot chain line in FIGS. 1 and 11. The insertion position is determined by bringing a stopper contact portion 5d protruding from the lens holding cylinder portion 5a into contact with a stopper 301i (FIGS. 8 to 11) provided on the vibration isolation frame 301. . A third group frame biasing spring 39 made of a torsion coil spring having one end and the other end locked to the vibration isolating frame 301 and the third group frame 5 biases the third group frame 5 toward the insertion position.

  When the third group frame 5 is in the insertion position, the third lens group LG3 is located on the photographing optical axis O. When the third group frame 5 rotates to the disengagement position, the third lens group LG3 is greatly displaced in the Y-axis direction with respect to the photographing optical axis O, and a part of the third lens group LG3 is a cylinder of the third group support ring 8. It protrudes to the outside of the shaped part 8c. An escape hole 301j having a shape corresponding to the movement locus of the lens holding cylinder portion 5a at this time (an arcuate locus around the rotation shaft 35) passes through the frame main body 301a of the vibration isolation frame 301 in the optical axis direction. The lens holding cylinder portion 5a enters the escape hole 301j. The escape hole 301i penetrates (opens) the outer periphery of the frame main body 301a of the vibration isolation frame 301, and a bridge portion 301k is provided to reinforce the opening portion of the escape hole 301i. The bridging portion 301k is formed to be offset rearward so that it does not interfere with the lens holding cylinder portion 5a when the third group frame 5 is rotated to the separation position. As described above, the holder main body portion 304a of the sensor holder 304 is an open frame-like body in which a space between both ends in the circumferential direction is opened, and the bridge portion of the vibration isolation frame 301 is formed by the open portion of the holder main body portion 304a. Interference with the part 301k is prevented.

  As shown in FIGS. 5, 8, 9, and 10, in the vicinity of the rear end portion of the third group support ring 8, rotation (swing) is possible around a rotation shaft 50 parallel to the photographing optical axis O. The detachment drive lever 305 is supported. The rotation shaft 50 is projected from the third group support ring 8 and is inserted into a shaft hole formed in the shaft hole portion 305 a of the separation drive lever 305. The detachment drive lever 305 includes a shaft seat portion 8d (FIGS. 8 and 9) formed in the third group support ring 8 and a retaining plate 307 fixed to the rear portion of the shaft seat portion 8d. By sandwiching the part, the movement in the front-rear direction with respect to the third group support ring 8 is restricted. The retaining plate 307 is fitted to the rotation shaft 50 penetrating the shaft hole portion 305 a and is in contact with the wall portion on the third group support ring 8 to be fixed in position. The separation drive lever 305 has a separation pressing portion 305c near the tip of an arm 305b extending in the outer diameter direction from the shaft hole 305a, and this separation pressing portion 305c is provided on the arm 5c of the third group frame 5. It can contact the pressed part 5e. The separation pressing portion 305c has a plane facing the rotation radius direction of the separation driving lever 305 opposed to the pressed portion 5e. The pressed portion 5e is formed as an outer peripheral surface of a cylindrical projection whose axis is parallel to the photographing optical axis O, and faces the plane that forms the separation pressing portion 305c. Therefore, the detachment pressing portion 305c and the pressed portion 5e transmit a rotational force from the detachment drive lever 305 to the third group frame 5, but do not transmit a force in a direction parallel to the photographing optical axis O. . The separation drive lever 305 is further provided with a pressed portion 305d that protrudes from the shaft hole 305a in the outer diameter direction.

  As shown in FIG. 10, the rotation shaft 50 that pivotally supports the separation drive lever 305 is provided in the vicinity of the rotation shaft 35 that pivotally supports the third group frame 5, and the rotation shaft 50 is the rotation shaft 35. It is located on the outer diameter side far from the photographing optical axis O. The urging force of the third group frame urging spring 39 urges the third group frame 5 to rotate from the disengagement position to the insertion position direction (counterclockwise in FIGS. 10 and 11). The lever is biased by a lever biasing spring (first biasing member) 306 (FIG. 5) in the same direction. A stopper 8e for determining an insertion allowable position, which is a rotation end of the separation drive lever 305 in the biasing direction of the lever biasing spring 306, is formed on the third group support ring 8. When the insertion allowable position of the separation drive lever 305 is determined, a part of the pressed portion 305d comes into contact with the stopper 8e. On the other hand, the rotation of the third group frame 5 in the biasing direction by the third group frame biasing spring 39 is restricted by the contact between the stopper contact portion 5d and the stopper 301i. 8, 10, and 11 show that the third group frame 5 and the separation drive lever 305 are in contact with the respective stoppers (the illustration of the separation drive lever 305 is omitted in FIGS. 10 and 11). At this time, the pressed part 5e and the separation pressing part 305c are separated from each other. The clearance between the pressed portion 5e and the separation pressing portion 305c is the movable range of the vibration isolation frame 301 within the third group support ring 8 (the range until the movement limiting protrusion 304e contacts the inner surface of the movement limiting hole 301e). Inside, the size is set such that the pressed part 5e is not brought into contact with the separation pressing part 305c. In other words, the detachment drive lever 305 does not restrict the anti-vibration driving of the anti-vibration frame 301 and the third group frame 5 when it is in the insertion allowable position. If no external force is applied to the third group frame 5 and the separation drive lever 305, the third group frame 5 is held at the insertion position by the biasing force of the third group frame biasing spring 39.

  As shown in FIG. 4, the image sensor holder 21 located behind the anti-vibration lens block 80 is provided with a detachment pressing protrusion (detachment drive means) 21b positioned on the side of the sensor holding portion 21a. The separation pressing projection 21b protrudes forward, an end face cam 21c is formed at the tip, and a separation holding surface 21d substantially parallel to the photographing optical axis O is formed on the side surface following the end surface cam 21c. Note that the separation pressing protrusion 21b can be provided on any member constituting the lens barrel other than the image sensor holder 21 as long as the separation driving lever 305 described below can be operated. .

  The separation pressing protrusion 21b is positioned behind the separation driving lever 305 when the lens barrel is in the photographing state, and is attached to the separation pressing protrusion 21b according to the rearward movement of the third group support ring 8 when the lens barrel is in the retracted state. On the other hand, the separation drive lever 305 approaches. Then, the pressed portion 305d of the separation drive lever 305 contacts the end face cam 21c, and the separation drive lever 305 resists the biasing force of the lever biasing spring 306 from the moving force of the third group support ring 8 rearward in the optical axis direction. The separation driving lever 305 rotates by the amount corresponding to the clearance described above, and then the separation pressing portion 305c comes into contact with the pressed portion 5e of the third group frame 5. A pressing force in the direction of the separation position is transmitted to the third group frame 5 through the contact portion between the separation pressing portion 305c and the pressed portion 5e, and both the third group frame biasing spring 39 and the lever biasing spring 306 are biased. The detachment drive lever 305 presses and rotates the third group frame 5 in the detachment direction against the force. After the third group frame 5 reaches the disengagement position, the disengagement holding surface 21d provided on the disengagement pressing protrusion 21b is engaged with the side surface of the pressed portion 305d, and the disengagement drive lever 305 resists the biasing force of the lever biasing spring 306. The third group frame 5 is held at the disengagement position (the two-dot chain line in FIGS. 1 and 11). The position of the separation drive lever 305 at this time is referred to as a separation forcing position.

  The operation of the anti-vibration lens block 80 having the above structure will be described. In the photographing state in which the third group frame 5 is held at the insertion position by the biasing force of the third group frame biasing spring 39, the permanent magnets 311 and 312 and the coil 313 are selected according to the direction and magnitude of the shake applied to the lens barrel. , 314 to drive the anti-vibration frame 301 in the plane orthogonal to the optical axis to shift the center of the third lens group LG3 with respect to the photographing optical axis O, and to capture the subject image on the imaging plane. Deviation (image blur) can be suppressed. Specifically, the moving angular velocity of the lens barrel is detected by a gyro sensor built in the camera, the angular velocity of the shake is time-integrated to obtain a moving angle, and the moving amount of the image on the imaging surface is calculated from the moving angle. In addition to the calculation, the driving amount and driving direction of the third lens group LG3 (anti-vibration frame 301) for canceling the image blur are calculated. Then, energization control of the coil 313 and the coil 314 is performed based on the calculated value. Then, the anti-vibration frame 301 is moved while the ball contact surface 301c on the rear surface of the frame main body 301a receives support guidance with respect to the three guide balls 302. When the anti-vibration frame 301 is caused to perform anti-vibration driving, the third group frame 5 is held at an insertion position where the stopper abutting portion 5d abuts against the stopper 301i, and the anti-vibration frame 301 and the third group frame 5 (third The lens group LG3) is moved together. As described above, since the clearance is provided between the pressed portion 5e and the separation pressing portion 305c, the separation driving lever 305 supported on the third group support ring 8 side is provided between the vibration isolation frame 301 and the third group frame 5. Does not regulate anti-vibration driving.

  In the imaging state, the magnetic sensors 315 and 316 can be calibrated using the moving end position of the vibration isolation frame 301 by the contact between the movement limiting projection 304e and the inner surface of the movement limiting hole 301e. The direction F1 and F2 of thrust of each pair of the permanent magnets 311 and 312 and the coils 313 and 314 intersect with the X axis and the Y axis at a relationship of about 45 degrees, and the movement limiting hole 301e with respect to the movement limiting protrusion 304e. The moving end where both ends in the X-axis direction abut is set as the X-axis drive reference position of the voice coil motor, and the moving end where both ends in the Y-axis direction of the movement restricting hole 301e are brought into contact with the movement restricting projection 304e. Can be used as the drive reference position for the Y-axis. The practical vibration-proof driving range of the vibration-proof frame 301 in the photographing state is set in a range where the movement restriction protrusion 304e does not contact the inner surface of the movement restriction hole 301e.

  When the photographing state is changed to the stowed state, the anti-vibration lens block 80 including the third group support ring 8 is moved rearward in the optical axis direction by the driving force of the zoom motor 150 and eventually retracts together with the third group support ring 8. The pressed portion 305d of the lever 305 contacts the end face cam 21c of the release pressing protrusion 21b. Then, the pressed portion 305d is pressed by the end face cam 21c, a component force is generated from the backward movement force of the third group support ring 8, and the detachment drive lever 305 is inserted into the insertion allowable position against the urging force of the lever urging spring 306. Is turned toward the forcible separation position, and the separation pressing portion 305c comes into contact with the pressed portion 5e. As described above, the urging force toward the insertion position is applied to the third group frame 5 by the third group frame urging spring 39, and the detachment drive lever 305 that makes the detachment pressing portion 305c contact the pressed portion 5e is provided. An attempt is made to press the third group frame 5 from the insertion position toward the removal position against the biasing force of the third group frame biasing spring 39. In addition, an urging force in a direction in which the ball contact surface 301 c of the frame main body 301 a is pressed against the guide ball 302 by the three tension springs 303 acts on the vibration isolation frame 301 that supports the third group frame 5. That is, the movement resistance due to the urging force of the third group frame urging spring 39 and the tension spring 303 acts on the third group frame 5 and the vibration isolation frame 301, respectively. Here, the rotational resistance of the third group frame 5 provided by the third group frame biasing spring 39 is set larger than the movement resistance of the vibration isolation frame 301 provided by the tension spring 303. Therefore, the pressing force acting on the third group frame 5 is transmitted to the vibration isolation frame 301, and the vibration isolation frame 301 together with the third group frame 5 is started before the rotation of the third group frame 5 toward the separation position is started. It is moved toward the separation position. Then, the anti-vibration frame 301 is moved until the Y-axis direction end portion (end portion on the insertion position side) of the movement restriction hole 301e contacts the movement restriction protrusion 304e. When further movement of the vibration isolation frame 301 is restricted, the third group frame 5 is independently rotated from the insertion position to the removal position. That is, the separation movement of the third lens group LG3 is a combined movement of the vibration-proof frame 301 in the Y-axis direction at the initial stage and the subsequent rotation of the third group frame 5 to the separation position with respect to the vibration-proof frame 301. As done.

  After the third lens group LG3 is detached from the optical path (imaging optical axis O), when the third group support ring 8 continues to move backward, the separation holding surface 21d of the separation pressing protrusion 21b is pressed against the pressed portion 305d. The third group frame 5 is held at the separation position together with the separation drive lever 305, and the rotation to the insertion position is restricted. As shown in FIG. 1, when the zoom lens barrel 10 reaches the retracted state, the fourth lens group is placed in a space in the third group support ring 8 that is vacated by the separation of the third lens group LG3 (lens holding cylinder portion 5a). LG4 etc. enters. Thereby, the optical axis direction size at the time of accommodation can be made smaller than a lens barrel of a type in which a plurality of optical elements are accommodated in series on the optical axis.

  Conversely, when shifting from the housed state to the photographing state, the third group support ring 8 is moved forward to release the pressing of the separation driving lever 305 (holding at the separation forcing position) by the separation pressing protrusion 21b, and the separation driving lever 305 is released. Is returned to the insertion allowable position by the biasing force of the lever biasing spring 306. Then, the third group frame 5 is rotated from the detached position to the insertion position by the biasing force of the third group frame biasing spring 39. Along with this, the vibration isolating frame 301 can be driven by the voice coil motor. Then, the above-described magnetic sensors 315 and 316 are calibrated when the photographing state is entered.

  In the above-described anti-vibration lens block 80, the separation drive lever 305 is supported by the third-group support ring 8 separately from the third-group frame 5 and the anti-vibration frame 301 that support the third lens group LG3. At this time, the separation driving lever 305 is pressed by the separation pressing projection 21b to be moved to the separation forcing position, and the third group frame 5 is pressed and moved to the separation position via the separation driving lever 305. The separation drive lever 305 is supported by a rotation shaft 50 parallel to the rotation shaft 35 of the third group frame 5 and is rotated along a plane orthogonal to the photographing optical axis O. The part where the load in the optical axis direction is transmitted to the pressure is up to the separation drive lever 305, and the load in the optical axis direction does not act on the third group frame 5 or the vibration isolation frame 301. As described above, the detachment pressing portion 305c and the pressed portion 5e are formed as surfaces having a shape that does not transmit a force in a direction parallel to the photographing optical axis O, so that the detachment is temporarily pressed by the detachment pressing protrusion 21b. Even if the drive lever 305 moves a little in the direction along the axis of the rotation shaft 50, the third group frame 5 is not pressed in the direction along the axis of the rotation shaft 35. As a result, the load on the support mechanism of the third group frame 5 and the vibration isolation frame 301 is reduced, and high-precision driving of the third lens group LG3 is ensured.

  By interposing the separation drive lever 305, the pressing force in the optical axis direction by the separation pressing projection 21b does not directly act on the third group frame 5 or the vibration isolation frame 301. The urging force of the tension spring 303 for sandwiching the guide ball 302 between the holders 304 can be set without taking into account the load variation due to the pressing force from the detachment pressing protrusion 21b. Specifically, if the urging force of the tension spring 303 is too strong, the load on the voice coil motor that drives the vibration isolation frame 301 is increased, and if the urging force of the tension spring 303 is too small, the guide ball 302 falls off. Since there is a fear, the biasing force of the tension spring 303 may be set in consideration of the balance. Unlike the present embodiment, if the structure is such that the pressing force in the optical axis direction by the detachment pressing protrusion 21b acts on the vibration isolation frame 301, the balance of the urging force set by the tension spring 303 is lost. However, according to the configuration of the present embodiment, such a problem can be avoided.

  Unlike the third group frame 5 that changes the position of the rotation shaft 35 in accordance with the movement of the vibration isolation frame 301, the separation drive lever 305 pressed by the separation pressing protrusion 21b has a position relative to the third group support ring 8. Since it is supported by the rotation shaft 50 on the third group support ring 8 that does not change, the positional relationship with the separation pressing projection 21b can be kept constant without being affected by the movement position of the vibration isolation frame 301. As a result, the relative position of the pressed portion 305d of the release drive lever 305 and the end face cam 21c of the release press protrusion 21b is not displaced, and the release drive lever 305 can be driven with high accuracy. The contact portion between the separation drive lever 305 and the third group frame 5 is formed by a planar separation pressing portion 305c facing the rotation radius direction of the separation driving lever 305 and a pressed portion 5e which is a projection portion of a cylindrical outer surface. Therefore, even if the position of the third group frame 5 changes due to the vibration-proof movement of the vibration-proof frame 301, the separation pressing portion 305c is moved when the separation driving lever 305 is rotated from the insertion allowable position to the separation forcing position. The third group frame 5 can be rotated to the disengagement position by reliably contacting the pressed part 5e.

  In the anti-vibration lens block 80, the third lens group LG3 is not fixedly supported by the third group support ring 8, but the third group frame 5 that supports the third lens group LG3 is provided on the anti-vibration frame 301. Further, the vibration isolating frame 301 is supported in a movable manner in the third group support ring 8 so as to be movable in a plane orthogonal to the optical axis. Therefore, the accuracy error of each movable part accumulates, and the positional deviation of the third lens group LG3, particularly the inclination (falling) of the optical axis of the third lens group LG3 with respect to the imaging optical axis O of the entire imaging optical system is likely to occur. In order to ensure the optical accuracy of the third lens group LG3, the anti-vibration lens block 80 includes an inclination adjustment (tilt) mechanism for adjusting the inclination of the third lens group LG3 with respect to the photographing optical axis O. The tilt adjustment mechanism of the present embodiment tilts the shutter unit 100 and the lens unit 81 integrally, and an integral tilting portion combining the shutter unit 100 and the lens unit 81 is referred to as a tilt unit 82.

  As a component of the tilt adjustment mechanism, a front plate 7 is attached in the third group support ring 8 so as to be positioned in front of the shutter unit 100. As shown in FIGS. 5 and 9, the front plate 7 is a flange-like member having an opening 7a forming an optical path in the center, and is formed by processing a metal plate. In the front plate 7, a plurality of positioning holes 7b penetrating in the optical axis direction and three engaging portions 7c having different circumferential positions are formed. Each engaging portion 7c has a configuration in which an engaging hole penetrating in the radial direction is formed on a rectangular thin plate portion protruding rearward in the optical axis direction. On the outer peripheral surface on the front end side of the third group support ring 8, three engaging portions 8 f are formed in a circumferential positional relationship corresponding to the three engaging portions 7 c of the front plate 7. Each engagement portion 8f is configured by a recess having a shape with which the rectangular thin plate portion of each engagement portion 7c is engaged, and an engagement protrusion formed on the bottom surface of the recess. By engaging the thin plate portion of the engaging portion 7c with the concave portion of the engaging portion 8f and engaging the engaging protrusion of the engaging portion 8f with the engaging hole of the engaging portion 7c, the third group support ring A front plate 7 is attached in the vicinity of the front end of 8. By the engagement of the engaging portion 7c and the engaging portion 8f, the front plate 7 is restricted from relative movement in the optical axis direction and relative rotation in the circumferential direction with respect to the third group support ring 8. The outer peripheral portion of the front plate 7 abuts against the inner peripheral surface of the third group support ring 8 without backlash, and the relative movement of the front plate 7 in the radial direction of the third group support ring 8 is also restricted. That is, the front plate 7 is fixedly supported with respect to the third group support ring 8.

  In the shutter unit 100, three support protrusions (tilting support portions) 100e are formed on the outer peripheral surface of the shutter housing 100a (FIGS. 10 and 11), and a plurality of positioning protrusions 100f and three positioning protrusions 100f are provided on the front surface of the shutter housing 100a. A spring insertion hole 100g is formed (FIGS. 5 and 6). The three support protrusions 100e are supported by three support grooves (tilting support portions) 8g (one visible in FIGS. 5 and 9) formed inside the cylindrical portion 8c of the third group support ring 8. . Each support groove 8g extends in the optical axis direction, and the rotation of the shutter unit 100 within the third group support ring 8 is restricted by the engagement relationship with each support protrusion 100e. As shown in FIG. 5, a compression spring (second urging member) 9 is inserted into each spring insertion hole 100 g of the shutter unit 100. The compression spring 9 is compressed and deformed in a state where the front end is in contact with the front plate 7 and the rear end is in contact with the bottom surface of the spring insertion hole 100g, and the shutter unit 100 is separated from the front plate 7, That is, it is biased toward the rear in the optical axis direction.

  The plurality of positioning projections 100f provided on the shutter unit 100 are engaged with the plurality of positioning holes 7b of the front plate 7, and the approximate position of the shutter unit 100 with respect to the front plate 7 is determined. However, the positioning protrusion 100f and the positioning hole 7b are loosely fitted and do not hinder the tilting of the shutter unit 100 with respect to the front plate 7. A front part of the shutter unit 100 is provided with a soldering part 100h for fixing the flexible substrate 90, and the front plate 7 has a notch part 7d (FIGS. 4 and 5) for exposing the soldering part 100h. Yes. A light shielding plate 20 (FIG. 3) that covers the front portion of the front plate 7 is further provided at the front end of the third group support ring 8.

  As shown in FIGS. 5, 6, 9 to 14, the sensor holder (tilting member) 304 constituting the lens unit 81 is provided with a fulcrum protrusion (fulcrum) 304 k on the outer periphery of the holder main body 304 a. ing. As shown in FIGS. 12 to 14, the fulcrum protrusion 304 k abuts on a fulcrum abutting portion 8 h formed on the inner peripheral surface of the third group support ring 8 and is restricted from moving rearward in the optical axis direction. The fulcrum contact portion 8h is formed as a rear end portion of a groove extending in the optical axis direction. The sensor holder 304 is further formed with two screw contact portions 304m and 304n. The screw contact portions 304m and 304n are formed as flat portions facing rearward in the optical axis direction. As shown in FIGS. 10 and 11, the fulcrum protrusion 304 k and the two screw contact portions 304 m and 304 n are provided at circumferential positions close to the three support protrusions 100 e and the three tension springs 303 in the shutter unit 100. ing.

  As shown in FIGS. 8 and 9, a rear flange (flange portion) 8 i protruding in the inner diameter direction is formed on the inner peripheral surface near the rear end portion of the cylindrical portion 8 c of the third group support ring 8. Screw support portions 8j and 8k located at the rear of the screw contact portions 304e and 304f of the sensor holder 304 are further formed inside the third group support ring 8. The screw support portions 8j and 8k are formed as a part of the rear flange 8i, and have a cylindrical shape having a screw hole penetrating in the optical axis direction. The front end portions of the screw support portions 8j and 8k are flat surfaces that are substantially orthogonal to the photographing optical axis O, and a front opening 8m that communicates with the screw holes is formed on the flat surfaces (FIG. 5). Although only the front opening 8m of the screw support portion 8j is shown in FIG. 5, the front opening 8m is similarly formed at the front end portion of the screw support portion 8k. The screw holes of the screw support portions 8j and 8k pass through the rear flange 8i and open rearward in the optical axis direction, and the adjustment screw 309 is screwed into the screw holes from the rear. The adjustment screw 309 has a screw tip 309a at one end of a shaft portion screwed into the screw holes of the screw support portions 8j and 8k, a screw head 309b at the other end, and the screw tip 309a facing forward. Inserted into each screw hole. The screw head portion 309b has a larger diameter than the shaft portion and has a cross groove that can be engaged with a tool for rotating operation. Hereinafter, the adjustment screw 309T1 is the side screwed to the screw support portion 8j, and the adjustment screw 309T2 is the side screwed to the screw support portion 8k. Each of the adjusting screws 309T1 and 309T2 has a shaft portion screwed into the screw hole of the corresponding screw support portion 8j or 8k, and the screw tip 309a protrudes forward through the front opening 8m. The screw tip 309a of the adjustment screw 309T1 contacts the screw contact portion 304m of the sensor holder 304 located in front of the screw support portion 8j, and the screw tip 309a of the adjustment screw 309T2 is a sensor located in front of the screw support portion 8k. It contacts the screw contact portion 304n of the holder 304. The screw tip 309a has a hemispherical protruding shape and makes point contact with the screw contact portions 304m and 304n. The screw contact portion 304m and the screw contact portion 304n are in contact with the adjustment screw 309T1 and the adjustment screw 309T2, respectively, so that rearward movement in the optical axis direction is restricted.

  That is, in the sensor holder 304, the fulcrum protrusion 304k is brought into contact with the fulcrum contact portion 8h of the third group support ring 8, and the screw contact portion 304m and the screw contact portion 304n are brought into contact with the adjustment screw 309T1 and the adjustment screw 309T2. As a result, the backward movement in the optical axis direction is restricted. The lens unit 81 including the sensor holder 304 is urged rearward in the optical axis direction by three compression springs 9 disposed between the front plate 7 and the shutter unit 100, and the sensor holder 304 is caused by this urging force. (The fulcrum protrusion 304k, the screw contact portion 304m, and the screw contact portion 304n) are applied to the three locations (the fulcrum contact portion 8h, the adjustment screw 309T1, and the adjustment screw 309T2) on the third group support ring 8 side. The position of the lens unit 81 in the optical axis direction is determined. Since the sensor holder 304 is coupled to the shutter unit 100, the position in the optical axis direction of the entire tilt unit 82 including the lens unit 81 and the shutter unit 100 is determined.

  In the anti-vibration lens block 80 having the above-described configuration, the photographing optical axis is adjusted by adjusting the tightening amounts of the adjustment screw 309T1 and the adjustment screw 309T2 and changing the positions of the screw tips 309a of the adjustment screws 309T1 and 309T2 in the optical axis direction. The tilt of the tilt unit 82 with respect to O can be arbitrarily adjusted. This adjustment is performed by engaging a tool such as a screwdriver with the cross groove of the screw head 309b of each of the adjustment screws 309T1 and 309T2 exposed on the rear end side of the third group support ring 8. 13 and 14 show a state in which the adjustment screw 309T1 is moved back and forth in the optical axis direction based on the state of FIG. FIG. 13 shows a state in which the adjustment screw 309T1 is screwed from the reference position of FIG. 12 and advanced forward in the optical axis direction. The screw tip 309a of the adjustment screw 309T1 pushes the screw contact portion 304m forward, and the sensor holder 304 is The screw contact portion 304m is tilted forward with the contact portion between the fulcrum protrusion 304k and the fulcrum contact portion 8h as a fulcrum. When the front surface of the shutter unit 100 comes into contact with the front plate 7 as shown in FIG. 13, the tilting operation of the tilt unit 82 further forward is restricted.

  FIG. 14 shows a state in which the adjustment screw 309T1 is loosened and moved rearward in the optical axis direction from the reference position in FIG. 12, and the screw contact portion 304m follows the adjustment screw 309T1 and moves rearward due to the urging force of the compression spring 9. The sensor holder 304 is moved and tilted with the screw contact portion 304m displaced rearward, with the contact point between the fulcrum protrusion 304k and the fulcrum contact portion 8h as a fulcrum. The rearward movement limit of the tilt unit 82 including the lens unit 81 in the third group support ring 8 is determined by the sensor holder 304 coming into contact with the front end portions of the screw support portions 8j and 8k. When the adjustment screws 309T1 and 309T2 are moved backward by a predetermined amount or when the adjustment screws 309T1 and 309T2 are removed from the screw support portions 8j and 8k, the sensor holder 304 moves the front end of the screw support portion 8j and the screw support portion 8k. This prevents the tilt unit 82 from moving excessively or dropping off. As shown in FIGS. 12 to 14, the rear flange 8 i is located behind the bridge portion 301 k of the vibration isolation frame 301, but when the tilt unit 82 is moved backward in the third group support ring 8, Before the bridging portion 301k comes into contact with the rear flange 8i, the sensor holder 304 comes into contact with the screw support portion 8j and the front end portion of the screw support portion 8k.

  When the sensor holder 304 is inclined as shown in FIGS. 13 and 14, the vibration isolating frame 31 coupled to the sensor holder 304 via the tension spring 303, the front arm portion 304b, the engagement recess 304c, the engagement groove 100c, and the engagement. Similarly, the shutter unit 100 coupled to the sensor holder 304 via the mating protrusion 100d is also tilted, and the angle of the entire tilt unit 82 with respect to the photographing optical axis O changes. As a result, the angle of the optical axis of the third lens group LG3 on the third group frame 5 is adjusted. 13 and 14 show the case where the position of the adjustment screw 309T1 in the optical axis direction is changed. Similarly, when the position of the adjustment screw 309T2 in the optical axis direction is changed, the screw tip 309a of the adjustment screw 309T2 is also shown. The position of the screw contact portion 304n with which the contact is made changes back and forth, and the angle of the tilt unit 82 with respect to the photographing optical axis O changes with the contact point between the fulcrum protrusion 304k and the fulcrum contact portion 8h as a fulcrum. As shown in FIGS. 10 and 11, the contact point between the fulcrum protrusion 304k and the fulcrum contact part 8h, the contact point between the adjustment screw 309T1 and the screw contact part 304m, and the contact point between the adjustment screw 309T2 and the screw contact part 304n. The photographing optical axis O is located within a region surrounded by a triangle connecting three points, and the third group frame 5 is in the insertion position by rotating the adjustment screw 309T1 and the adjustment screw 309T2 as appropriate. The direction of inclination and the magnitude (angle) of the third lens group LG3 can be arbitrarily set.

  In the anti-vibration lens block 80, the third lens group LG3 and the shutter S are in a very close positional relationship in the optical axis direction, but the lens unit 81 and the shutter unit 100 are integrally adjusted as a tilt unit 82 to adjust the tilt. The relative positional relationship between the third lens group LG3 and the shutter S does not change, and mutual interference between the third lens group LG3 and the shutter S due to the tilt adjustment can be prevented. In other words, the positional relationship between the third lens group LG3 and the shutter S can be set without considering the influence of the tilt adjustment.

  The tilt adjustment of the tilt unit 82 is performed by the adjustment screws 309T1 and 309T2 that expose the screw head 309b on the rear end side of the third group support ring 8 and move forward and backward in the optical axis direction. Even in such a state, the adjustment work can be easily performed. In particular, in the zoom lens barrel 10 of the present embodiment, the screw heads 309b of the adjustment screws 309T1 and 309T2 can be accessed simply by removing the image sensor holder 21, so that the tilt adjustment can be performed without removing the anti-vibration lens block 80. It is. Further, since the adjusting screws 309T1 and 309T2 are oriented in the optical axis direction, the diameter size of the third group support ring 8 incorporating the tilt unit 82 is not increased. In the anti-vibration lens block 80 of the illustrated embodiment, the shutter unit 100 is positioned forward in the optical axis direction and the lens unit 81 is positioned rearward in the optical axis direction within the third group support ring 8. A configuration in which is reversed is also possible. In this case, the adjustment screws 309T1 and 309T2 can be inserted into the third group support ring 8 from the front in the optical axis direction, and the adjustment screws 309T1 and 309T2 can be rotated from the front.

  In the lens unit 81, the third group frame 5 is supported with respect to the vibration isolation frame 301 so as to be rotatable about the rotation shaft 35 to the insertion position and the separation position, and the stopper contact portion 5d is provided with respect to the stopper 301i. The insertion position is determined by contact. In this support structure, the inclination of the third group frame 5 in the direction intersecting the virtual plane PG (FIGS. 10 and 11) passing through the position where the stopper contact portion 5d contacts the stopper 301i and the rotation shaft 35 is increased. It tends to occur. As shown in FIGS. 10 and 11, before and after the tilt adjustment fulcrum (the contact point between the fulcrum protrusion 304 k and the fulcrum contact portion 8 h) is set to a position close to the virtual plane PG and the tilt adjustment is performed. The two locations where the displacement is input (the contact location between the adjustment screw 309T1 and the screw contact portion 304m and the contact location between the adjustment screw 309T2 and the screw contact portion 304n) are sandwiched between the virtual plane PG and They are arranged separately in the other region. With this arrangement, the optical axis adjustment of the third lens group LG3 that tends to be inclined in the direction intersecting the virtual plane PG can be performed efficiently and accurately.

  In the lens unit 81, in addition to the insertion / removal operation of the third lens group LG3 performed by rotating the third group frame 5, a vibration isolation operation for moving the vibration isolation frame 301 in the plane orthogonal to the optical axis is also performed. Three tension springs 303 that hold the frame 301 against the sensor holder 304 are disposed along the outer periphery of the sensor holder 304. As shown in FIGS. 10 and 11, there are three contact points for adjusting the tilt of the tilt unit 82 (the contact point between the fulcrum protrusion 304k and the fulcrum contact part 8h, the contact between the adjustment screw 309T1 and the screw contact part 304m. The position of the adjustment screw 309T2 and the contact portion of the screw contact portion 304n is substantially the same as the three tension springs 303 in the radial direction centered on the photographing optical axis O, and interferes with the three tension springs 303. It is arranged at a position in the circumferential direction close to each tension spring 303 as long as it is not. Further, in the circumferential space between the three tension springs 303 and the three contact points for adjusting the tilt, one region (the upper region in FIGS. 10 and 11) sandwiching the virtual plane PX has a vibration proof. Permanent magnets 311 and 312 and coils 313 and 314 and magnetic sensors 315 and 316 constituting the voice coil motor for driving are arranged, and the other region across the virtual plane PX (the lower region in FIGS. 10 and 11) In addition, a rotation shaft 35 that pivotally supports the third group frame 5 and a detachment drive lever 305 that detachably drives the third group frame 5 are disposed. That is, the tilt adjustment mechanism of the tilt unit 82, the anti-vibration driving mechanism for the third lens group LG3, and the insertion / removal driving mechanism for the third lens group LG3 are the inner peripheral surface of the third group support ring 8. Are arranged in a space efficient manner.

  As mentioned above, although demonstrated based on illustration embodiment, this invention is not limited to this. For example, the anti-vibration lens block 80 of the illustrated embodiment includes an anti-vibration mechanism that performs anti-vibration driving of the third lens group LG3, and an insertion / removal mechanism that moves the third lens group LG3 to a separation position with respect to the photographing optical axis O in a housed state where photographing is not performed. However, the present invention can also be applied to a support structure for optical means that is provided with only the insertion / removal mechanism for the third lens group LG3 without the vibration isolation mechanism. In this case, the anti-vibration frame 301 in the illustrated embodiment is supported in a tiltable manner directly in the third group support ring 8 without using the sensor holder 304 or the shutter unit 100, and the anti-vibration frame 301 is supported with respect to the anti-vibration frame 301. The biasing force of the compression spring 9 is applied and the adjustment screw 309 is brought into contact.

  In the illustrated embodiment, two adjustment screws 309 (309T1 and 309T2) are used to adjust the tilt of the tilt unit 82. This is a preferable configuration from the viewpoint of simplifying the configuration by reducing the number of adjustment screws, but the present invention does not exclude the aspect of adjusting the inclination by using three or more adjustment screws. Even in such a case, it is only necessary to satisfy the requirement that at least two adjustment screws are separately arranged on both sides of the virtual plane PG.

2 Group 1 support ring 3 Group 2 support ring 5 Group 3 frame (insertion / removal frame)
5a Lens holding cylinder part 5b Shaft hole part 5c Arm 5d Stopper contact part 5e Pressed part 7 Front plate 7a Opening 7b Positioning hole 7c Engagement part 7d Notch part 8 3rd group support ring (support ring)
8c Cylindrical part 8d Shaft seat part 8e Stopper 8f Engagement part 8g Support groove (tilting support part)
8h Support point contact part 8i Rear flange (flange part)
8j 8k Screw support portion 8m Front opening 9 Compression spring (second biasing member)
DESCRIPTION OF SYMBOLS 10 Zoom lens barrel 11 Cam ring 11c Thin part 12 1st cylinder 13 2nd cylinder 14 Straight guide ring 15 3rd cylinder 20 Light-shielding plate 21 Image pick-up element holder 21a Sensor holding part 21b Separation press protrusion (detachment drive means)
21c End face cam 21d Separation holding surface 22 Housing 25 Filter 26 Vibration isolation unit 27 Shutter unit 35 Rotating shaft 36 Detachment member 37 Fixing screw 39 3rd group frame biasing spring 50 Rotating shaft 51 4th group frame 62 Image sensor 80 Antivibration lens Block 81 Lens unit 82 Tilt unit 90 Flexible substrate 90a Sensor support plate 100 Shutter unit (base member, tilting member)
100a Shutter housing 100b Shooting opening 100c Engaging groove 100d Engaging protrusion 100e Supporting protrusion (tilting support part)
100f Positioning projection 100g Spring insertion hole 100h Soldering part 101 Lens barrier mechanism 104 105 Barrier blade 150 Zoom motor 301 Anti-vibration frame (base member, optical axis shift frame)
301a Frame body 301b Ball support hole 301c Ball contact surface 301d Spring hooking protrusion 301e Movement limiting hole 301f 301g Magnet holding part 301h Shaft support part 301i Stopper 301j Escape hole 301k Bridge part 302 Guide ball 303 Tension spring 304 Sensor holder (base member) , Tilting member)
304a Holder body 304b Front arm 304c Engaging recess 304d Ball contact surface 304e Movement limiting projection 304f Spring hooking projection 304g 304h Sensor holding portion 304i Positioning projection 304j Locking projection 304k Support point projection (fulcrum portion)
304m 304n Screw contact portion 305 Detachment drive lever 305a Shaft hole portion 305b Arm 305c Detachment pressing portion 305d Pressed portion 306 Lever biasing spring (first biasing member)
307 retaining plate 308 sensor holding plate 308a positioning hole 308b support piece 308c contact piece 309 (309T1 309T2) adjusting screw 309a screw tip 309b screw head 311 312 permanent magnet (driving means)
313 314 Coil (drive means)
315 316 Magnetic sensor (detection member)
LG1 First lens group LG2 Second lens group LG3 Third lens group (optical means)
LG4 4th lens group M1 1st group control cam groove M2 2nd group control cam groove M3 3rd group control cam groove N1 N2 N3 Cam follower O Shooting optical axis S Shutter

Claims (11)

An optical means is held and supported to be rotatable about a rotation axis substantially parallel to the optical axis direction of the imaging optical system with respect to the base member, and the optical means is inserted on the optical axis of the imaging optical system. An insertion / removal frame that can be rotated to an insertion position and a separation position for separating the optical means from the optical axis of the imaging optical system;
A first biasing member that pivotally biases the insertion / removal frame toward the insertion position;
A stopper provided on the base member for determining the insertion position by bringing the insertion / removal frame into contact with the urging force of the first urging member;
A support ring for supporting the base member therein so as to be tiltable with respect to the optical axis of the imaging optical system;
A second urging member for applying an urging force in the optical axis direction to the base member in the support ring;
The support ring is screwed and supported so as to be able to advance and retreat in the optical axis direction, abuts against the base member from the side opposite to the direction of application of the urging force of the second urging member, and advances and retracts in the optical axis direction. A plurality of adjusting screws for changing an inclination angle of the base member with respect to the optical axis;
With
The optical means supporting structure according to claim 1, wherein the plurality of adjusting screws are divided into one and the other region sandwiching a plane passing through the stopper and the rotation shaft of the insertion / removal frame. 2. The optical means supporting structure according to claim 1, wherein a flange portion is provided inside the support ring, and a plurality of screw holes into which the plurality of adjusting screws are screwed are formed through the flange portion. Support structure. 3. The optical means support structure according to claim 2, wherein the base member is brought into contact with a part of the flange portion in a state in which the positioning by the adjusting screw is released, and thereby the biasing direction of the second biasing member. An optical means support structure in which the movement limit of the lens is determined. The optical means supporting structure according to any one of claims 1 to 3, comprising two adjusting screws. The optical means support structure according to any one of claims 1 to 4, wherein the base member is
A fulcrum part that abuts on a fulcrum contact part provided on the inner peripheral side of the support ring by the urging force of the second urging member; and a plurality of screw abutment parts on which the plurality of adjustment screws abut. A tilting member that changes the tilt angle with respect to the optical axis with the fulcrum portion as a fulcrum by advancing and retreating the adjusting screws in the optical axis direction; and the tilting member that pivotally supports the insertion / removal frame by the rotating shaft. An optical axis shift frame supported movably along a plane orthogonal to the optical axis;
An optical means supporting structure. 6. The optical means support structure according to claim 5, wherein the fulcrum contact part and the fulcrum part are located in the vicinity of the plane passing through the stopper and the rotation axis of the insertion / removal frame. 7. The optical means supporting structure according to claim 5 or 6, wherein the tilting member is composed of two tilting members that are coupled to each other at the front and rear of the optical axis shift frame in the optical axis direction, and the outer periphery of one of the tilting members. A tilting support portion that supports the one tilting member so as to be tiltable with respect to the support ring, and the other tilting member is provided with the fulcrum portion and the screw abutment. An optical means supporting structure in which a contact portion is formed. 8. The optical means supporting structure according to claim 7, wherein a part of driving means for applying thrust to the base member along a plane perpendicular to the optical axis is held on the one tilt member, and the other tilt member has An optical means supporting structure in which a detection member for detecting a moving position of the optical axis shift frame by the driving means is held. 9. The optical means supporting structure according to claim 7, wherein a shutter capable of opening and closing an optical path passing through the optical means is supported on the one tilting member. 10. The optical means supporting structure according to claim 1, wherein the optical means is a lens group. 11. The optical means support structure according to claim 1, wherein the support ring is movable in the optical axis direction of the imaging optical system, and the insertion / removal frame is moved by movement of the support ring in the optical axis direction. An optical means supporting structure comprising a detachment drive means for rotating from the insertion position to the detachment position against the urging force of the first urging member.

Images