JP2014174324A - Position controller for optical element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position controller for an optical element that is capable of movement for correcting image blur and inserting and releasing movement in an optical axis, the position controller achieving highly accurate driving of an optical element in a simple structure.SOLUTION: In a position controller, a vibration-proofing mechanism energizes two coils provided on one of a support member and a vibration-proofing movable member, and generates thrust in a direction perpendicular to each boundary of magnetic force of two permanent magnets provided on the other of the support member and the vibration-proofing movable member. On the vibration-proofing movable member, an inserting/releasing member that inserts/releases an optical element into/from an optical axis of an imaging optical system is pivotally supported. Two permanent magnets are symmetrically arranged with respect to a first reference plane containing the optical axis, and have an inclination such that each boundary of magnetic force approaches the first reference plane as it separates from a second reference plane perpendicular to the first reference plane and through the optical axis. Viewing along the optical axis, a rotational axis of the inserting/releasing member is provided in one of both areas located on either side of the second reference plane, with the one area being opposite to the other area provided with each permanent magnet and each coil. In the one area, a central angle based on the optical axis is 15 degrees normally and reversely on either side of the first reference plane.

Description

  The present invention relates to an optical element position control apparatus capable of moving for image blur correction and inserting / removing on / from the optical axis.

  In an optical device such as a camera, when camera shake is detected, a specific optical element such as a lens or an image sensor is driven in a plane perpendicular to the optical axis of the optical system, and an image on the imaging surface is displayed. Many are equipped with an image stabilization mechanism (image shake correction mechanism) that suppresses the shake. In all of Patent Documents 1 to 3, for the purpose of reducing the size of the lens barrel, the anti-vibration optical element is moved out of the anti-vibration movement range (outside the optical axis) in the retracted state where no photographing is performed. This is a proposal for the technology to be applied.

JP 2007-199320 A JP 2007-102050 A JP 2012-181228 A

  The position control device of the vibration-proof optical element described in Patent Document 1 to Patent Document 3 includes a vibration-proof moving member that is movably supported in a plane perpendicular to the optical axis of the optical system inside the lens barrel. And a swing frame that can swing about an axis parallel to the optical axis is supported on the anti-vibration moving member. The anti-vibration optical element is held by the swing frame, and when the anti-vibration moving member is driven, the swing frame moves integrally, and the anti-vibration optical element does not come off the optical path of the optical system. The position changes in the range. Further, the vibration-proof optical element can be moved to a position outside the optical path of the optical system by the rotation of the swing frame.

  Thus, the mechanism for inserting and removing the vibration-proof optical element on the optical path through the swing frame has an advantage that the configuration can be easily simplified. On the other hand, the components of the actuator that drives the swing frame and the vibration-proof moving member (for example, permanent magnets and coils in the voice coil motor) are arranged eccentrically from the optical axis of the optical system. If the weight balance is poor, an inappropriate moment may act when driving the vibration-proof moving member, which may affect the operation accuracy.

  The present invention has been made in view of the above problems, and in an optical element position control device capable of movement for image blur correction and insertion / removal on the optical axis, the optical element has a simple configuration. The purpose is to realize highly accurate driving.

  An optical element position control device according to the present invention includes an anti-vibration moving member supported so as to be movable along a surface orthogonal to the optical axis of the imaging optical system with respect to a support member, and an actuator that drives the anti-vibration movement member The optical element that constitutes the photographic optical system is held, the insertion position for positioning the optical element on the optical axis of the photographic optical system around the rotation axis parallel to the optical axis, and the optical element removed from the optical axis And an insertion / removal member supported on the vibration-proof moving member so as to be swingable with respect to the separation position. The actuator thrusts in the direction perpendicular to the magnetic boundary line of the permanent magnet provided on the other of the support member and the vibration-proof moving member by energizing the coil provided on one of the support member and the vibration-proof moving member. In the plane perpendicular to the optical axis, two permanent magnets are provided so that the directions of the magnetic boundary lines are perpendicular to each other, and the two permanent magnets are arranged in a direction parallel to the optical axis. Two coils are provided facing each other. The two permanent magnets are arranged substantially symmetrically with respect to the first reference plane including the optical axis, and each magnetic force boundary line passes through the optical axis and moves away from the second reference plane perpendicular to the first reference plane. It is inclined in a direction approaching the first reference plane. When viewed along the optical axis, the rotation axis of the insertion / removal member is a region on the opposite side to the side on which the two permanent magnets and the two coils are provided in both side regions sandwiching the second reference plane. Further, in this region, the central angle with respect to the optical axis is arranged in a region of 15 degrees on the opposite side of the first reference plane.

  The insertion / removal member has a holding portion that holds the optical element, a shaft support portion that is pivotally supported by the rotation shaft, and an arm portion that connects the holding portion and the shaft support portion, and the insertion / removal member is in the insertion position. The arm portion may be extended along the first reference plane.

  A line passing through the center of the set of permanent magnets and coils constituting the voice coil motor and facing the direction of the thrust of the set of permanent magnets and coils, and passing through the center of the other set of permanent magnets and coils and It is preferable that the line which faces the direction of the thrust of the set of permanent magnets and coils intersects on the first reference plane.

  Also, a set of permanent magnets constituting the voice coil motor, a first sensor for detecting the position of the vibration-proof moving member in the direction of the thrust applied by the coil, and the action of the thrust by the other set of permanent magnet and coil. A second sensor for detecting the position of the vibration-proof moving member in the direction, and a line along the position detection direction by the first sensor and a line along the position detection direction by the second sensor intersect on the optical axis Is preferred.

  It can be arbitrarily selected whether the permanent magnet and the coil are provided on the support member or the vibration-proof moving member. However, by providing two permanent magnets on the vibration-proof moving member and two coils on the support member, wiring to the coil is possible. The structure can be simplified.

  The optical element held by the insertion / removal member is preferably a lens group.

  According to the present invention, the component member of the voice coil motor and the insertion / removal member that holds the optical element are disposed on the vibration-proof moving member with a good weight balance, and the voice coil motor improperly affects the driving of the vibration-proof moving member. Load is less likely to occur. Therefore, it is possible to realize high-accuracy anti-vibration driving with a simple configuration.

It is a sectional side view which shows the internal structure of the lens-barrel to which this invention is applied. FIG. 3 is a front exploded perspective view showing a rectilinear guide ring, a three-group moving ring, a vibration-proof lens unit, and a shutter unit constituting the lens barrel. It is a front exploded perspective view of an anti-vibration lens unit. It is the front view which looked at the anti-vibration lens unit in a state where the insertion / removal frame is at the insertion position from the subject side with the sensor holder omitted. FIG. 5 is a front perspective view of the vibration-proof lens unit in the state of FIG. 4. FIG. 5 is a rear perspective view of the vibration proof lens unit in the state of FIG. 4. It is the front view which looked at the anti-vibration lens unit in a state where the insertion / removal frame is at the insertion position from the subject side with the coil base omitted. FIG. 8 is a side cross-sectional view of the image stabilizing lens unit along the line VIII-VIII in FIG. 7. It is a front disassembled perspective view of the vibration isolating frame and the sensor holder in a state where the insertion / removal frame is at the insertion position. It is a back disassembled perspective view of the vibration isolating frame and the sensor holder in a state where the insertion / removal frame is at the insertion position. It is the rear view which looked at the anti-vibration lens unit in the state where an insertion / removal frame exists in an insertion position from the image side. FIG. 12 is a rear perspective view of the image stabilizing lens unit in the state of FIG. 11. It is the rear view which looked at the anti-vibration lens unit in the state where an insertion / removal frame exists in a separation position from the image side. FIG. 14 is a rear perspective view of the vibration proof lens unit in the state of FIG. 13. It is a front exploded perspective view of an anti-vibration lens unit and a 3 group moving ring. It is the figure which showed the anti-vibration lens unit and the 3 group moving ring in the state which has an insertion / removal frame in an insertion position in the side cross section containing an imaging optical axis. It is the front view which looked at the anti-vibration lens unit and the 3 group moving ring in the state where the insertion / removal frame is in the separation position from the subject side It is sectional drawing which follows the XVIII-XVIII line of FIG. FIG. 3 is a front exploded perspective view of a straight guide ring, a three-group moving ring, an anti-vibration lens unit, and a shutter unit viewed from an angle different from FIG. 2. FIG. 4 is a rear exploded perspective view of a straight guide ring, a three-group moving ring, a vibration-proof lens unit, and a shutter unit. It is a front view which shows arrangement | positioning of the electromagnetic actuator and insertion / removal frame in an anti-vibration lens unit. It is a front view which shows arrangement | positioning of the electromagnetic actuator and insertion / removal frame in a comparative example with embodiment of this invention.

  FIG. 1 shows the internal structure of a retractable zoom lens barrel 1 built in the camera. Specifically, the zoom lens barrel 1 is stored (collapsed). In the following description, the direction along the photographing optical axis O of the photographing optical system in the zoom lens barrel 1 is referred to as an optical axis direction, the optical axis subject side is defined as the front, and the image side is defined as the rear. Further, a circumferential direction with the photographing optical axis O as an axis is defined as a circumferential direction.

  The photographing optical system of the zoom lens barrel 1 includes a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4 in order from the subject side, and the first lens group L1 to the third lens group L1. The positions of the three groups up to the lens group L3 are controlled by driving a zoom motor (not shown), and the position of the fourth lens group L4 is controlled by driving a focusing motor (not shown). An image sensor 17 is disposed behind the fourth lens unit L4.

  The zoom lens barrel 1 has a cylindrical housing (not shown), and a cam ring 11 is supported in the housing. Between the cam ring 11 and the housing, there is provided an external cylinder (not shown) that forms an external appearance when the zoom lens barrel 1 is extended. The cam ring 11 is rotationally driven in the circumferential direction according to the driving of the zoom motor. A guide projection 11a is provided on the outer surface of the cam ring 11, and the guide projection 11a is slidably fitted into a guide groove formed on the inner peripheral surface of the housing. The guide groove includes a lead groove and a cam groove, and the position of the cam ring 11 in the optical axis direction is controlled by the guide protrusion 11a being guided by the guide groove. When the zoom lens barrel 1 is changed from the housed state in FIG. 1 to the photographing state, the cam ring 11 is rotated forward in the optical axis direction.

  A coupling groove 11b extending in the circumferential direction is formed inside the cam ring 11, and a coupling projection 10a of the linear guide ring 10 is slidably fitted into the coupling groove 11b. Due to the fitting of the coupling groove 11b and the coupling projection 10a, the cam ring 11 and the linear guide ring 10 are restricted in relative movement in the optical axis direction (moved together in the optical axis direction) and can be relatively rotated. The rectilinear guide ring 10 is slidably fitted in a long groove (not shown) in the optical axis direction formed on the inner peripheral surface of the housing, and the rectilinear guide ring 10 is restricted from rotating with respect to the housing, and is in the optical axis direction. It is guided straight ahead so that it can only move.

  As shown in FIGS. 2, 19 and 20, the rectilinear guide ring 10 is formed with three rectilinear guide grooves 10b at different circumferential positions. Each rectilinear guide groove 10b is a long groove extending in the optical axis direction, and penetrates in the radial direction. A rectilinear guide key 8a of the third group moving ring 8 is fitted to each rectilinear guide groove 10b so as to be slidable in the optical axis direction, and the third group moving ring 8 is lighted by the relationship between the rectilinear guide groove 10b and the straight guide key 8a. It is guided to move straight in the axial direction. A support groove 8b (FIG. 2) is formed inside each linear guide key 8a, and a cam follower CF3 projects from the outer surface of each linear guide key 8a. Each cam follower CF3 is slidably fitted to a cam groove CG3 formed on the inner peripheral surface of the cam ring 11. When the cam ring 11 rotates, the cam follower CF3 receives the guidance of the cam groove CG3 and moves in three groups. The position of the ring 8 in the optical axis direction is controlled.

  As shown in FIGS. 2 and 15 to 20, a vibration-proof lens unit 14 and a shutter unit 16 are supported in the third group moving ring 8. Although details of the vibration-proof lens unit 14 will be described later, the third lens group L3 is held in the vibration-proof lens unit 14 via a vibration-proof frame (vibration-proof moving member) 18 and an insertion / removal frame (insertion / removal member) 20. Has been.

  As shown in FIG. 1, the first lens group L <b> 1 is held inside the first group cylinder 12, and the second lens group L <b> 2 is held inside the second group cylinder 13. The second group cylinder 13 is guided through the linear guide ring 10 so as to be linearly movable in the optical axis direction, and the first group cylinder 12 is similarly guided so as to be linearly movable in the optical axis direction. The first group cylinder 12 is an external cylinder located outside the cam ring 11, and a cam follower CF1 provided in the first group cylinder 12 is slidably fitted into a cam groove CG1 formed on the outer peripheral surface of the cam ring 11. . The second group cylinder 13 is located inside the cam ring 11, and the cam follower CF2 provided in the second group cylinder 13 is slidably fitted to the cam groove CG2 formed on the inner peripheral surface of the cam ring 11. Yes. When the cam ring 11 rotates, the cam follower CF1 receives the guide of the cam groove CG1 to control the position of the first group cylinder 12 in the optical axis direction, and the cam follower CF2 receives the guide of the cam groove CG2 to the direction of the optical axis of the second group cylinder 13 The position is controlled.

  The third lens unit L3 supported in the third group moving ring 8 moves in a predetermined range along a plane orthogonal to the imaging optical axis O on the optical path, and an insertion / removal operation with respect to the optical path on the imaging optical axis O. It is an optical element capable of anti-vibration operation. Details of the support driving mechanism of the third lens unit L3 will be described below.

  The third group moving ring 8 has a cylindrical portion 8c surrounding the photographing optical axis O, and an inner flange 8d protruding in the inner diameter direction is partially (intermittently) formed in the circumferential direction inside the cylindrical portion 8c. The anti-vibration lens unit 14 is supported on the front side of the inner flange 8d, and the shutter unit 16 is supported on the rear side of the inner flange 8d. As shown in FIGS. 2, 15, and 19, the inner flange 8 d protrudes forward in the optical axis direction with three screw screw holes 8 e and spring accommodating recesses 8 f opening forward in the optical axis direction. A shaft protrusion 8g is formed.

  As shown in FIG. 3, the anti-vibration lens unit 14 includes an anti-vibration frame 18 between a sensor holder (support member) 22 positioned forward in the optical axis direction and a coil base (support member) 24 positioned rearward in the optical axis direction. And the insertion / removal frame 20 is held. As shown in FIGS. 3, 7, 9, and 10, the sensor holder 22 has a plate-like main body portion that is substantially orthogonal to the photographing optical axis O, and has an inner opening at a central portion through which the photographing optical axis O passes. 22a. Part of the circumferential direction of the sensor holder 22 is an open portion 22a-1 in which the inner opening 22a communicates with the outer peripheral portion of the sensor holder 22, and an inner peripheral portion of the sensor holder 22 close to the open portion 22a-1 An inner circumferential relief 22b having a shape in which the inner opening 22a is further cut out in the outer diameter direction is formed. A first sensor holding part 22c and a second sensor holding part 22d, which are bottomed concave parts, are formed on the front side of the sensor holder 22.

  As shown in FIG. 10, three ball support recesses 22 e are formed on the rear surface side of the sensor holder 22 facing the vibration isolation frame 18 so as to have different positions in the circumferential direction. Around each ball support recess 22e, an escape recess 22f having an opening area larger than that of the ball support recess 22e is formed. The three ball support recesses 22e and the relief recesses 22f are located at approximately the same distance from the photographic optical axis O, and are disposed at substantially equal intervals (approximately 120 degrees apart) in the circumferential direction around the photographic optical axis O. . Each of the ball support recess 22e and the escape recess 22f is a bottomed recess having a bottom surface orthogonal to the photographing optical axis O, and opens toward the rear in the optical axis direction. Each of the three ball support recesses 22e has a cylindrical inner peripheral wall surrounding the bottom surface. One of the three escape recesses 22f has a cylindrical inner peripheral wall substantially concentric with the ball support recess 22e, and the inner peripheral walls of the remaining two escape recesses 22f are generally square in a plane orthogonal to the photographing optical axis O. It has a rectangular tube shape. The latter square cylindrical relief recess 22f is referred to as a movement restricting recess 22f-1.

  Two screw insertion holes 22 g that penetrate in the optical axis direction are formed in the vicinity of the outer periphery of the sensor holder 22. The two screw insertion holes 22g are substantially at the same position in the optical axis direction. On the outer periphery of the sensor holder 22, two spring hooking projections 22h that are in a substantially symmetrical positional relationship across the photographing optical axis O, and a plurality (four) of engagement pieces 22i that protrude rearward in the optical axis direction, A plurality of contact portions 22j that protrude rearward in the optical axis direction with a smaller protrusion amount than the respective engagement pieces 22i are provided. At the end of each engagement piece 22i, a claw in the inner diameter direction that approaches the photographing optical axis O is formed. The sensor holder 22 further has two positioning holes 22k penetrating in the optical axis direction.

  As shown in FIGS. 3 to 6 and 11 to 14, the coil base 24 is a frame-like body that surrounds the photographing optical axis O, and an inner opening 24 a having a shape corresponding to the inner opening 22 a of the sensor holder 22 is formed. An inner circumferential relief portion 24b is formed at a position corresponding to the inner circumferential relief portion 22b of the sensor holder 22. Similar to the sensor holder 22, a part of the coil base 24 in the circumferential direction is opened by an open portion 24a-1 following the inner opening 24a, but the rear portion of the open portion 24a-1 is connected by a bridging portion 24c. Yes. The bridging portion 24c has a plate-shaped light shielding plate portion 24d substantially orthogonal to the photographing optical axis O. As shown in FIGS. 6, 12, and 14, the light shielding plate portion 24 d has a thick portion and a thin portion having different thicknesses in the optical axis direction, and a screw insertion hole 24 e that penetrates the thick portion in the optical axis direction. Is formed. As shown in FIGS. 11, 13, and 17, when viewed along the photographing optical axis O, the screw insertion hole 24 e (center) of the coil base 24 and the two screw insertion holes 22 g (center of the sensor holder 22). ) Is generally located at the apex of an equilateral triangle surrounding the photographing optical axis O. In other words, a total of three screw insertion holes 22g and 24e are arranged at substantially equal intervals in the circumferential direction around the photographing optical axis O. However, the two screw insertion holes 22g are at the same position in the optical axis direction, whereas the screw insertion hole 24e is at a position offset backward in the optical axis direction with respect to the screw insertion hole 22g (see FIG. 18).

  As shown in FIG. 3, a first coil support portion 24 f and a second coil support portion 24 g which are bottomed concave portions are formed on the front side of the coil base 24. Each of the first coil support 24f and the second coil support 24g is a recess having a bottom surface substantially orthogonal to the imaging optical axis O, and a pair of support protrusions from the bottom surface of the first coil support 24f toward the front in the optical axis direction. 24h protrudes and a pair of support protrusions 24i protrude from the bottom surface of the second coil support portion 24g toward the front in the optical axis direction.

  As shown in FIGS. 3 to 6, contact portions 24 j that protrude forward in the optical axis direction are provided at a plurality of locations on the outer peripheral portion of the coil base 24. One of the contact portions 24j is formed with a positioning protrusion 24k that protrudes forward in the optical axis direction. A positioning protrusion 24m that protrudes forward in the optical axis direction is provided between the first coil support portion 24f and the second coil support portion 24g. In addition, three support protrusions 24n are projected from the outer peripheral portion of the coil base 24 toward the outer diameter direction at substantially equal intervals in the circumferential direction.

  The anti-vibration frame 18 is a frame-like body that surrounds the photographing optical axis O, and has an inner opening 18 a that communicates with the inner opening 22 a of the sensor holder 22 and the inner opening 24 a of the coil base 24. A shaft support portion 18b is provided at a position corresponding to the escape portion 24b. A shaft support hole 18c is formed through the shaft support portion 18b in the optical axis direction. Similar to the coil pedestal 24, a part in the circumferential direction of the vibration isolation frame 18 is an open portion 18 a-1 in which the inner opening 18 a communicates with the outer peripheral portion, but FIG. 3 to FIG. 7, FIG. 9, FIG. As shown in FIG. 15 and the like, the front part of the open part 18a-1 is connected by a bridge part 18d having a shape offset toward the front in the optical axis direction. The vibration isolating frame 18 is further formed with a relief hole 18e into which the positioning protrusion 24m of the coil base 24 can be inserted.

  As shown in FIGS. 3 to 5, 9, and 10, the vibration isolation frame 18 has a first magnet holding portion 18 f formed at a position facing the first sensor holding portion 22 c and the first coil support portion 24 f. A second magnet holding portion 18g is formed at a position facing the second sensor holding portion 22d and the second coil support portion 24g.

  As shown in FIGS. 3, 4, 5, 8, and 9, three ball support cylinders 18 h are formed at different positions on the front side of the vibration isolation frame 18 facing the sensor holder 22. Has been. The three ball support tube portions 18h are located at approximately the same distance from the photographing optical axis O and are disposed at substantially equal intervals (intervals of approximately 120 degrees) in the circumferential direction around the photographing optical axis O. The ball support cylinder portion 18 h is in a positional relationship facing the ball support recess 22 e of the sensor holder 22. Each ball support cylinder portion 18h has a cylindrical shape protruding forward in the optical axis direction, has a front end portion in the optical axis direction opened, and has a bottom surface in the rear end portion in the optical axis direction. Inside each ball support cylinder portion 18h, a guide ball 28, which is a spherical rolling element, is supported in a rollable manner. As shown in FIG. 8, each guide ball 28 is set to have a diameter protruding forward from the tip (front end) of the ball support cylinder portion 18h in a state of being in contact with the bottom surface of the ball support cylinder portion 18h. The sensor holder 22 is held in contact with the bottom surface of the ball support recess 22e. Hereinafter, the bottom surface of the ball support cylinder 18h that holds the guide ball 28 and the bottom surface of the ball support recess 22e are referred to as ball contact surfaces, respectively. Each of these ball contact surfaces is a smooth plane substantially orthogonal to the photographing optical axis O. The guide ball 28 is loosely fitted in the ball support tube portion 18h in the direction orthogonal to the optical axis. When the guide ball 28 is located near the center of the ball support tube portion 18h, the guide ball 28 contacts the inner peripheral wall of the ball support tube portion 18h. Do not touch (see FIG. 8).

  Two spring hooking projections 18 i are provided on the outer peripheral portion of the vibration isolation frame 18. Each spring hooking protrusion 18i is in a position facing the spring hooking protrusion 22h provided on the sensor holder 22 in the optical axis direction, and a tension spring 30 is stretched between each spring hooking protrusion 18i and each spring hooking protrusion 22h. . The anti-vibration frame 18 is urged in the direction approaching the sensor holder 22 (forward) by the urging force of the two tension springs 30, and the ball contact surfaces of the three ball support cylinders 18 h are applied to the three guide balls 28. By making contact, the forward movement of the vibration isolation frame 18 with respect to the sensor holder 22 is restricted. In this state, the ball contact surface of each ball support cylinder portion 18h is in point contact with the corresponding guide ball 28, and the point contact portion is brought into sliding contact (or the guide ball 28 is in contact with the ball support cylinder). The anti-vibration frame 18 is freely movable in a direction orthogonal to the photographing optical axis O while the guide ball 28 rolls when not in contact with the inner peripheral wall of the portion 18h.

  As shown in FIG. 8, with the anti-vibration frame 18 and the sensor holder 22 coupled with the guide ball 28 interposed therebetween, the inner wall surface of each movement restricting recess 22f-1 and the outer peripheral surface of each ball supporting cylinder portion 18h There is a clearance D1 between them, and the anti-vibration frame 18 with respect to the sensor holder 22 is in the range of the photographing optical axis until the outer peripheral surface of each ball support cylinder portion 18h comes into contact with the inner wall surface of each movement restricting recess 22f-1. It can move freely in a plane orthogonal to O. A clearance larger than the clearance D1 is secured between one relief recess 22f having a cylindrical inner peripheral wall that is not the movement restricting recess 22f-1 and the ball support cylinder portion 18h, and the movable range of the vibration isolation frame 18 is secured. They do not touch each other.

  A coil base 24 is fixed to the rear portion of the sensor holder 22 that movably supports the vibration isolation frame 18. At this time, while positioning by positioning the positioning projections 24k and 24m into the two positioning holes 22k, the rear surface of the sensor holder 22 is brought into contact with the contact portion 24j, and the front surface of the coil base 24 Is brought into contact with the contact portion 22j, thereby determining the distance between the sensor holder 22 and the coil base 24 in the optical axis direction. Further, by engaging the claw at the tip of the engagement piece 22i of the sensor holder 22 with the rear surface of the coil base 24, the separation between the sensor holder 22 and the coil base 24 in the optical axis direction is regulated (see FIGS. 12 and 14). ).

  The sensor holder 22 and the coil base 24 in a combined state have a shape that does not hinder the movement of the vibration isolation frame 18. For example, in the anti-vibration frame 18, the shaft support portion 18b protrudes in the front-rear direction and the bridging portion 18d protrudes forward, but the shaft support portion 18b has a predetermined clearance inside the inner peripheral escape portion 22b and the inner peripheral escape portion 24b. The bridge portion 18d is positioned with a predetermined clearance between the open portions 22a-1 (see FIG. 7). A clearance is also ensured between the escape hole 18 e of the vibration isolation frame 18 and the positioning projection 24 m of the coil base 24. The clearances of these parts are set to be larger than the clearance D1 between the ball support cylinder 18h and the movement restricting recess 22f-1 described above, and are orthogonal to the imaging optical axis O with respect to the sensor holder 22 and the coil base 24. The movement of the anti-vibration frame 18 within the plane to be performed is not restricted at any place other than the ball support cylinder 18h and the movement restricting recess 22f-1.

  In a state where the sensor holder 22 and the coil base 24 are combined with the vibration isolating frame 18 interposed therebetween, the respective inner openings 18a, 22a and 24a communicate with each other in the optical axis direction to form a movable space of the insertion / removal frame 20 described later. . Further, it pivots to a later-described detachment position between the bridge portion 18d of the anti-vibration frame 18 having a shape offset forward in the optical axis direction and the bridge portion 24c of the coil base 24 having a shape offset backward in the optical axis direction. A storage space for storing the inserted / removed frame 20 is formed.

  The anti-vibration frame 18 is driven by an electromagnetic actuator. The electromagnetic actuator is a voice coil motor having two permanent magnets 31 and 32 supported by the vibration isolation frame 18 and two coils 33 and 34 supported by the coil base 24. As shown in FIGS. 3, 10, 11, and 13, the permanent magnet 31 and the permanent magnet 32 have substantially the same shape and size, and each has a thin rectangular plate shape. The permanent magnet 31 is fitted and held in the recess of the first magnet holding portion 18f, and the permanent magnet 32 is fitted and held in the recess of the second magnet holding portion 18g. Permanent magnet 31 and permanent magnet 32 each have one of the half regions divided by magnetic boundary lines Q1 and Q2 (FIGS. 11, 13, and 21) passing through substantially the center in the short direction and extending in the longitudinal direction. And the other is the S pole. In the holding state by the first magnet holding part 18f and the second magnet holding part 18g, the permanent magnet 31 and the coil 33 have a reference plane (first reference plane) P1 including the photographing optical axis O (FIGS. 11, 13, and FIG. 21) in a symmetrical relationship. The permanent magnet 31 and the permanent magnet 32 move from the outer edge side (the side far from the photographing optical axis O) to the inner diameter side (the side closer to the photographing optical axis O) with respect to the reference plane P1. The magnetic field boundary lines Q1 and Q2 are arranged with an inclination to increase the interval between them, and the inclination angle of the magnetic field boundary line Q1 and the magnetic field boundary line Q2 with respect to the reference plane P1 is set to about 45 degrees in the opposite direction. That is, the permanent magnet 31 and the permanent magnet 32 have a relationship in which the magnetic boundary lines Q1 and Q2 are substantially orthogonal to each other.

  As shown in FIGS. 3, 11, 13, and 21, the coils 33 and 34 are air-core coils having a pair of substantially parallel long side portions and a pair of curved portions that connect the long side portions, Its shape and size are substantially the same. The coil 33 is held on the first coil support part 24f by inserting a pair of support protrusions 24h into the air core part 33a (see FIG. 21), and the coil 34 is inserted by inserting a pair of support protrusions 24i into the air core part 34a. (Refer FIG. 21) It hold | maintains on the 2nd coil support part 24g. In the holding state by the first coil support portion 24f and the second coil support portion 24g, the long side (long axis) direction of the coil 33 is substantially parallel to the magnetic boundary line Q1 of the permanent magnet 31, and the long side (long side) of the coil 34 is long. (Axis) direction is substantially parallel to the magnetic force boundary line Q <b> 2 of the permanent magnet 32. In a state where the vibration isolating frame 18 is located at the center of the driving range by the vibration isolating mechanism (in an initial position in the optical design where the shake correcting operation is not performed), the photographing light as shown in FIGS. When viewed along the axis O, the long axis of the coil 33 that is parallel to the long side portion and passes through the air core portion 33a is substantially coincident with the magnetic force boundary line Q1 of the permanent magnet 31, and the coil 34 is parallel to the long side portion. The long axis passing through the air core part 34 a substantially coincides with the magnetic force boundary line Q <b> 2 of the permanent magnet 32. In other words, the coils 33 and 34 have a long axis relative to the reference plane P1 as they go from the outer edge side (the side farther from the photographing optical axis O) to the inner diameter side (the side closer to the photographing optical axis O). It is arranged with an inclination to increase the interval of (long side part), and the inclination angle of the long axis of the coil 33 and the coil 34 with respect to the reference plane P1 is set to about 45 degrees in the forward and reverse directions. That is, the coil 33 and the coil 34 have a relationship in which their major axes are substantially orthogonal. The coils 33 and 34 are connected to a control board of the camera via a flexible board, and energization control of the coils 33 and 34 is performed by a control circuit on the control board.

  In the electromagnetic actuator having the above configuration, the permanent magnet 31 and the coil 33 are opposed to each other in the optical axis direction, and when the coil 33 is energized, the magnetic force boundary line Q1 (the long axis of the coil 33) 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 the Y axis (FIGS. 11, 13, and 21). Further, the permanent magnet 32 and the coil 34 face each other in the optical axis direction, and when the coil 34 is energized, the direction substantially orthogonal to the magnetic boundary line Q2 (long axis of the coil 34) in a plane orthogonal to the photographing optical axis O. The thrust to is applied. The acting direction of this thrust is taken as the X axis (FIGS. 11, 13, and 21). Both the X axis and the Y axis intersect with the reference plane P1 at an angle of about 45 degrees (a relationship that is substantially orthogonal to each other), and are orthogonal to the imaging optical axis O by energization control of the coils 33 and 34. The anti-vibration frame 18 can be moved within the plane to be moved. As shown in FIG. 11 and FIG. 13, with the vibration isolating frame 18 positioned at the center of the movable range, it passes through the center of the permanent magnet 31 and the coil 33 (the center in both the longitudinal direction and the short direction) to the Y axis. The intersection of the line along the line along the X axis passing through the center of the permanent magnet 32 and the coil 34 (the center in both the longitudinal direction and the short direction) is located on the photographing optical axis O (on the reference plane P1).

  The first sensor holding portion 22c and the second sensor holding portion 22d of the sensor holder 22 are respectively provided with a magnetic sensor 35 positioned in front of the permanent magnet 31 on the vibration isolation frame 18 and a magnetic sensor positioned in front of the permanent magnet 32. 36 is assembled (see FIGS. 7, 11, 13 and 21). The magnetic sensor 35 and the magnetic sensor 36 are supported on a flexible substrate 50 (FIGS. 2, 3, 15, and 17) connected to the control substrate of the camera, and are mounted on the front side of the sensor holder 22. 50 is held by a pressing plate 51. The magnetic sensor 35 and the magnetic sensor 36 are Hall sensors. When the position of the permanent magnet 31 changes according to the movement of the vibration isolation frame 18 by the electromagnetic actuator, the output of the magnetic sensor 35 changes, and the position of the permanent magnet 32 changes. The output of the magnetic sensor 36 changes, and the position of the anti-vibration frame 18 can be detected by the output change of the two magnetic sensors 35 and 36. As shown in FIGS. 11 and 13, the magnetic sensor 35 is positioned to face the center of the permanent magnet 31 with the vibration isolation frame 18 positioned at the center of the movable range, and the magnetic sensor 36 is the permanent magnet 32. It is located opposite the center. The intersection of the line in the Y-axis direction where the position of the image stabilizer frame 18 is detected by the magnetic sensor 35 and the line in the X-axis direction where the position of the image stabilizer frame 18 is detected by the magnetic sensor 36 is on the photographing optical axis O. Located in. When the camera is activated, the magnetic sensors 35 and 36 are calibrated by driving the anti-vibration frame 18 to the moving end limited by the ball support cylinder 18h and the movement restricting recess 22f-1.

  An insertion / removal frame 20 is supported on the vibration isolation frame 18 so as to be rotatable (swingable) about a rotation axis 37 parallel to the photographing optical axis O. Both ends of the rotation shaft 37 are inserted and supported in shaft support holes 18 c formed in the vibration isolation frame 18. The insertion / removal frame 20 includes a lens holding tube portion (holding portion) 20a that holds the third lens unit L3, a shaft hole portion (shaft support portion) 20b that is supported by the rotating shaft 37, and a lens holding tube portion 20a. The arm part 20c which connects the axial hole part 20b is provided. The insertion / removal frame 20 has an insertion position (solid lines in FIGS. 2, 4 to 7, 9 to 12, 15, 16, 19, 20, and 21) and a removal position (FIGS. 1, 13). 14, FIG. 17, FIG. 18, and FIG. 21, and a stopper that protrudes from the lens holding cylinder 20 a with respect to a stopper 18 j (FIG. 10) provided on the vibration isolation frame 18. The insertion position is determined by contacting the contact portion 20d. An insertion biasing spring 38 comprising a torsion coil spring having one end engaged with the vibration isolating frame 18 and the other end engaged with the arm 20c of the insertion / removal frame 20 applies the insertion / removal frame 20 toward the insertion position. It is fast.

  When the insertion / removal frame 20 is in the insertion position, the third lens unit L3 is located on the photographing optical axis O. The insertion / removal frame 20 is rotated from the insertion position to the removal position by the separation drive lever 40. The separation drive lever 40 will be described later. When the insertion / removal frame 20 is rotated to the removal position, the center of the third lens unit L3 moves away from the photographing optical axis O and is displaced toward the outer edge of the image stabilizing lens unit 14. The inner openings 18a, 22a, and 24a in the anti-vibration lens unit 14 have a relief shape corresponding to the movement trajectory of the lens holding cylinder portion 20a at this time (arc-shaped trajectory centered on the rotation shaft 37). The anti-vibration frame 18, the sensor holder 22, and the coil base 24 do not hinder the rotation of the insertion / removal frame 20. When the insertion / removal frame 20 rotates to the disengagement position, the lens holding cylinder portion 20a enters the space between the bridge portion 18d of the vibration isolation frame 18 and the bridge portion 24c of the coil base 24.

  As shown in FIGS. 2, 15, 17, and 18, the anti-vibration lens unit 14 is attached to the third group moving ring 8 using three attachment screws 42. At the time of attachment, after the compression springs 44 are respectively inserted into the three spring housing recesses 8f in the third group moving ring 8, the anti-vibration lens unit 14 with the coil base 24 facing rearward in the optical axis direction is attached to the inner flange 8d. Approach it from the front. Then, the front end portion of each compression spring 44 protruding from the spring housing recess 8 f comes into contact with the rear surface of the coil base 24. Here, the attachment screws 42 are inserted from the front into the two screw insertion holes 22g of the sensor holder 22 and the screw insertion holes 24e of the coil base 24, and the respective attachment screws 42 are screwed into the screw screw holes 8e. . When the screwing amount of the mounting screw 42 with respect to the screw screw hole 8e is increased, each compression spring 44 is compressed, and the anti-vibration lens unit 14 is urged forward in the optical axis direction within the third group moving ring 8 by the restoring force against the compression. The The forward movement of the anti-vibration lens unit 14 is limited by the head of each mounting screw 42, and the position of the anti-vibration lens unit 14 in the optical axis direction within the third group moving ring 8 is determined. In addition, as shown in FIG. 17, the three support protrusions 24 n protruding from the coil base 24 engage with the three support grooves 8 b of the third group moving ring 8, thereby preventing the projection within a plane orthogonal to the photographing optical axis O. The position of the vibration lens unit 14 is determined. When the screwing amount of each mounting screw 42 is changed in this mounting state, the position of the screw head in the optical axis direction changes, and the position of the vibration-proof lens unit 14 changes following this. When the screwing amounts of the three mounting screws 42 are evenly changed, the position of the vibration-proof lens unit 14 in the optical axis direction within the third group moving ring 8 changes without changing the inclination with respect to the photographing optical axis O. When the screwing amount of the mounting screw 42 is changed individually, the inclination of the image stabilizing lens unit 14 (the optical axis of the third lens unit L3) with respect to the photographing optical axis O changes.

  A detachment drive lever 40 that rotates the insertion / removal frame 20 from the insertion position to the detachment position is supported by the third group moving ring 8 using a support seat 41. As shown in FIGS. 2, 15, 18 and 19, two fixed protrusions 8h are formed around the shaft protrusion 8g in the third group moving ring 8 (FIG. 18 shows only one fixed protrusion 8h. Have been). The support seat 41 includes a front support portion 41a having a disk shape substantially orthogonal to the photographing optical axis O, and a pair of retaining leg portions 41b protruding from the front support portion 41a. A circular hole is formed in the center of the front support portion 41a. Each of the pair of retaining legs 41b protrudes rearward in the optical axis direction with respect to the front support portion 41a and then is bent in the outer diameter direction. By fitting the tip end portion of the shaft projection 8g into the circular hole of the front support portion 41a (see FIG. 16), the end portion of each retaining leg portion 41b is engaged with the rear side in the optical axis direction of the fixed projection 8h (see FIG. 16). 18), the support seat 41 is fixedly supported by the third group moving ring 8. As shown in FIG. 6, a lever housing portion 24 p for housing the detachment drive lever 40 is formed on the coil base 24 constituting the vibration-proof lens unit 14. The lever storage portion 24p has a concave portion 24p-1 in which a part of the rear surface of the coil base 24 is cut out, and a cutout portion 24p-2 located on the side of the concave portion 24p-1. Further, a notch 18k is formed on the side of the vibration isolating frame 18 at a position overlapping the notch 24p-2 of the coil base 24. As shown in FIGS. 2, 11, 13, and 15 to 20, the anti-vibration lens unit 14 has a circular outer shape generally corresponding to the inner diameter size of the cylindrical portion 8 c of the third group moving ring 8. The shutter unit 16 has a similar circular outer shape. The cutout portion 18k of the vibration isolation frame 18 and the cutout portion 24p-2 of the coil pedestal 24 have a shape obtained by removing a part of the peripheral region of the circular vibration isolation lens unit 14, and are viewed along the photographing optical axis O. When this occurs, the notch 18k and the notch 24p-2 are located at a position overlapping the shutter unit 16. When the anti-vibration lens unit 14 is assembled to the third group moving ring 8, the shaft protrusion 8g and the support seat 41 are inserted into the lateral space of the notch 24p-2 and the notch 18k (see FIG. 16).

  The separation drive lever 40 includes a shaft hole portion 40a having a shaft hole that is pivotally supported by the shaft protrusion 8g, a pressing arm 40b extending from the shaft hole portion 40a in the outer diameter direction, and a pressed protrusion 40c. As shown in FIG. 16, when the support seat 41 is assembled to the third group moving ring 8 with the shaft protrusion 8g inserted into the shaft hole of the shaft hole portion 40a, the front support portion 41a of the support seat 41 and the third group moving ring are assembled. 8, the rearward movement of the detachment drive lever 40 with respect to the third group moving ring 8 is restricted by the inner flange 8d (base portion of the shaft projection 8g). In this state, the separation drive lever 40 can be rotated around the shaft protrusion 8g. As shown in FIG. 16, a coil portion of a lever urging spring 46 made of a torsion spring is inserted outside the shaft hole portion 40a. A pair of spring end portions extending from the coil portion of the lever biasing spring 46 is engaged with the retaining leg portion 41 b of the support seat 41 and the separation drive lever 40. In the support state of the detachment drive lever 40, the pressing arm 40b overlaps the recess 24p-1, and the shaft hole 40a enters the notch 24p-2 and the notch 18k (see FIGS. 12, 14, and 16). Further, the side surface near the tip of the pressing arm 40b faces the pressed portion 20e provided on the insertion / removal frame 20 (see FIGS. 11 and 13). The pressed portion 20e is provided in the vicinity of the shaft hole portion 20b, and is formed as a protrusion having a uniform cross-sectional shape in the optical axis direction. As shown in FIGS. 11 and 13, a portion of the pressed portion 20e facing the pressing arm 40b is formed as a cylindrical outer peripheral surface whose axis is parallel to the imaging optical axis O, and the pressing arm 40b and the pressed arm are pressed. The part 20e transmits a force in the rotational direction from the detachment drive lever 40 to the insertion / removal frame 20, but does not transmit a force in a direction parallel to the photographing optical axis O.

  The detachment drive lever 40 pivots (swings) between the insertion allowable position shown in FIGS. 11, 12, and 20 and the detachment forced position shown in FIGS. The urging force of the insertion urging spring 38 urges the insertion / removal frame 20 to rotate from the disengagement position toward the insertion position (counterclockwise in FIGS. 11 and 13). The separation drive lever 40 is urged by a lever urging spring 46 from the detachment forcing position toward the insertion allowable position (clockwise in FIGS. 11 and 13). A rotation end of the detachment drive lever 40 in the urging direction by the lever urging spring 46, that is, an insertion allowable position of the detachment drive lever 40 is a stopper formed on the inner peripheral surface of the cylindrical portion 8c of the third group moving ring 8. It is determined by contacting the part. On the other hand, the rotation of the insertion / removal frame 20 in the biasing direction by the insertion biasing spring 38 is regulated by the contact between the insertion / removal frame 20d and the stopper 18j (FIG. 10). 11 and 12 show the state where the insertion / removal frame 20 and the separation drive lever 40 are in contact with the respective stoppers. At this time, the pressed portion 20e and the pressing arm 40b are separated from each other (the clearance D2 in FIG. 11). As shown). The clearance D2 between the pressed portion 20e and the pressing arm 40b is a movable range of the vibration isolation frame 18 within the vibration isolation lens unit 14 (the outer peripheral surface of the ball support cylindrical portion 18h is on the inner surface of the movement restricting recess 22f-1). Within the range until contact), the pressed portion 20e is set to a size that does not contact the pressing arm 40b. In other words, the separation drive lever 40 does not restrict the vibration-proof drive of the vibration isolation frame 18 and the insertion / removal frame 20 by the electromagnetic actuator when it is in the insertion allowable position. If no external force is applied to the insertion / removal frame 20 and the separation drive lever 40, the insertion / removal frame 20 is maintained in the insertion position by the biasing force of the insertion biasing spring 38 as shown in FIGS.

  As shown in FIGS. 2, 19, and 20, a release pressing protrusion 10 c is formed to protrude inside the linear guide ring 10. A cam surface 10d facing rearward in the optical axis direction is formed on the separation pressing projection 10c. By pressing the pressed protrusion 40c with the cam surface 10d, the separation driving lever 40 can be rotated from the insertion allowable position direction to the separation forcing position. An inclined cam surface corresponding to the cam surface 10d is formed on the pressed protrusion 40c.

  On the inner side of the cylindrical portion 8c of the third group moving ring 8, a shutter unit 16 is supported behind the inner flange 8d using a pressing member 19 (FIG. 2). The shutter unit 16 has a photographing opening 16b penetrating in the optical axis direction at the center of a shutter housing 16a containing a shutter blade 16s (FIGS. 1, 16, and 18) that also serves as an aperture. The shutter blade 16s is formed by a built-in shutter actuator. To adjust the amount of light passing through the photographing aperture 16b by changing the aperture size.

  The operation of the zoom lens barrel 1 having the above structure will be described. In the photographing state, the insertion / removal frame 20 is held at the insertion position by the biasing force of the insertion biasing spring 38, and the third lens group L3 is positioned in the optical axis direction between the second lens group L2 and the third lens group L4. It is in. The detachment drive lever 40 is held at the insertion allowable position by the urging force of the lever urging spring 46. The light-shielding plate portion 24d at a position that covers a part of the inner opening 24a of the coil base 24 (near the open portion 24a-1) does not allow harmful light to pass through the inner opening 24a without passing through the third lens group L3. Cut off. The three lens units from the first lens unit L1 to the third lens unit L3 move along a predetermined locus in the optical axis direction by rotational driving of the cam ring 11, and perform a zooming operation. The fourth lens unit L4 is operated by a focusing motor. It moves independently in the direction of the optical axis and performs the focusing operation.

  In the photographing state, the third lens unit L3 is moved to the photographing optical axis O by driving the vibration isolating frame 18 within the optical axis orthogonal plane by the electromagnetic actuator according to the direction and magnitude of the shake applied to the zoom lens barrel 1. Accordingly, the shift (image blur) of the subject image on the imaging plane 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 unit L3 (anti-vibration frame 18) for canceling the image blur are calculated. Then, energization control of the coil 33 and the coil 34 is performed based on the calculated value. Then, the anti-vibration frame 18 is moved with respect to the three guide balls 28 while the ball contact surface on the rear side of the anti-vibration frame 18 (the bottom surface of the ball support cylinder portion 18h) receives support guidance. The insertion / removal frame 20 at the insertion position moves together with the vibration isolation frame 18. As described above, since the clearance D2 (FIG. 11) is provided between the pressed portion 20e and the pressing arm 40b, the separation drive lever 40 drives the vibration isolation frame 18 and the insertion / removal frame 20 for vibration isolation. Not regulated. The practical vibration-proof drive range of the vibration-proof frame 18 in the photographing state is set in a range where the ball support cylinder portion 18h does not contact the inner wall surface of the movement restricting recess 22f-1.

  When the photographing state is changed to the retracted state of FIG. 1, the third group moving ring 8, the linear guide ring 10, the cam ring 11, the first group cylinder 12 and the second group cylinder 13 are moved rearward in the optical axis direction by the zoom motor. In the transition from the photographing state to the storage state, the linear guide ring 10 has a larger rearward movement amount than the third group moving ring 8, and the separation pressing projection 10c formed in the straight guide ring 10 moves three groups. The cam surface 10d comes into contact with the pressed projection 40c by approaching the pressed projection 40c of the separation drive lever 40 supported in the ring 8. Then, the cam surface 10d of the release pressing projection 10c presses the pressed projection 40c, and a component force is generated from the backward movement force of the rectilinear guide ring 10 to resist the urging force of the lever urging spring 46. Is rotated from the insertion allowable position toward the forcible separation position, and the pressing arm 40b contacts the pressed portion 20e. The detachment drive lever 40 having the pressing arm 40b in contact with the pressed portion 20e rotates the insertion / removal frame 20 from the insertion position to the separation position against the urging force of the insertion urging spring 38.

  Here, an urging force in a direction in which the ball contact surface (the bottom surface of the ball support cylinder portion 18 h) is pressed against the guide ball 28 by the two tension springs 30 acts on the vibration isolation frame 18 that supports the insertion / removal frame 20. doing. The rotational resistance of the insertion / removal frame 20 provided by the insertion biasing spring 38 and the magnitude of the movement resistance of the vibration isolation frame 18 provided by the tension spring 30 can be arbitrarily set. For example, when the rotational resistance of the insertion / removal frame 20 is set to be larger than the movement resistance of the vibration isolation frame 18, the pressing force of the detachment drive lever 40 acting on the insertion / removal frame 20 is transmitted to the vibration isolation frame 18, and The anti-vibration frame 18 is moved together with the insertion / removal frame 20 in the direction of the separation position before the rotation of the 20 in the direction of the separation position is started. Then, the vibration isolating frame 18 is moved to a position where the outer peripheral surface of the ball support cylindrical portion 18h contacts the inner wall surface of the movement restricting recess 22f-1. When the further movement of the vibration isolation frame 18 is restricted, the insertion / removal frame 20 is rotated from the insertion position to the removal position. That is, a part of the separation movement of the third lens unit L3 is also carried by the vibration isolation frame 18.

  The third lens unit L3 is detached from the photographing optical axis O by the rotation of the insertion / removal frame 20 to the separation position. As shown in FIG. 1, when the zoom lens barrel 1 reaches the retracted state, the second lens group L2 is placed in the space in the third group moving ring 8 that is vacated by the separation of the third lens group L3 (lens holding cylinder portion 20a). Enters, and the second lens unit L2 and the third lens unit L3 are arranged side by side in a direction orthogonal to the photographing optical axis O. In addition, the third lens group L4 located behind the third group moving ring 8 in the photographing state enters the shutter unit 16 inside. 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.

  On the contrary, when moving from the storage state to the photographing state, the linear guide ring 10 moves more forward in the optical axis direction than the third group moving ring 8, and the release drive lever 40 is pressed by the release pressing projection 10c (to the release forced position). (Holding) is released, and the separation drive lever 40 returns to the insertion allowable position by the biasing force of the lever biasing spring 46. Then, the insertion / removal frame 20 is rotated from the removal position to the insertion position by the biasing force of the insertion biasing spring 38. When the photographing state is set, the vibration isolation frame 18 is driven by an electromagnetic actuator as necessary to calibrate the magnetic sensors 35 and 36.

  As shown in FIG. 21, in the vibration proof lens unit 14, the two permanent magnets 31 and 32 and the two coils 33 and 34 constituting the electromagnetic actuator are arranged symmetrically with respect to the reference plane P1. When a reference plane (second reference plane) P2 that is orthogonal to the reference plane P1 and passes through the photographic optical axis O is set, the magnetic boundary lines Q1 and Q2 of the permanent magnets 31 and 32 become the reference plane as the distance from the reference plane P2 increases. It is inclined in a direction approaching P1, and the inclination angle of each magnetic boundary line Q1, Q2 with respect to the reference plane P1 is approximately 45 degrees in the forward and reverse directions.

  The two permanent magnets 31 and 32 are supported by the vibration isolation frame 18, and the insertion / removal frame 20 is further supported on the vibration isolation frame 18. When viewed along the photographic optical axis O as shown in FIG. 21, the permanent magnet 31 and the permanent magnet 32 are circumferentially centered on the photographic optical axis O in one of both side regions sandwiching the reference plane P <b> 2. Are arranged at intervals of approximately 90 degrees. On the other hand, the rotation shaft 37 that is the rotation center of the insertion / removal frame 20 is opposite to the side where the permanent magnets 31 and 32 and the coils 33 and 34 are provided in both side regions sandwiching the reference plane P2. In the vicinity of the reference plane P1. R1 in FIG. 21 is a virtual circle that passes through the axis of the rotation shaft 37 with the photographing optical axis O as the center, and the permanent magnets 31 and 32 are located on the virtual circle R1. In other words, the permanent magnets 31 and 32 and the rotation shaft 37 are disposed at substantially the same radial distance from the photographing optical axis O.

  The insertion / removal frame 20 has a shape in which a lens holding cylinder portion 20 a is provided at the tip of an arm portion 20 c that extends from a shaft hole portion 20 b that is pivotally supported by the rotation shaft 37. In the insertion position of the insertion / removal frame 20 indicated by the solid line in FIG. 21, the third lens group L3 held by the lens holding cylinder 20a is positioned on the photographing optical axis O, and the arm 20c is substantially along the reference plane P1. Further, it extends to the side opposite to the side where the permanent magnets 31 and 32 are provided. At this time, the center of gravity of the image stabilizing frame 18 is located at G1 (FIG. 21) close to the photographing optical axis O. By setting the center of gravity at the position, when an anti-vibration frame 18 is driven to be anti-vibrated using an electromagnetic actuator, the generation of an inappropriate moment that interferes with the thrust to the X-axis and the Y-axis is suppressed. The frame 18 can be operated with high accuracy. The center of gravity is preferably close to the photographing optical axis O, and the center of gravity is set by setting the rotating shaft 37 within the range indicated by W in FIG. 21 (between the permanent magnet 31 and the permanent magnet 32) with the reference plane P1 as the center. The effect of suppressing the moment increases as it approaches the photographing optical axis O. More specifically, the inside of the effective axis region K indicated by hatching in FIG. 21 is the position of the rotating shaft 37 that satisfies the conditions for obtaining a suitable center of gravity position. The effective axis region K is a fan-shaped region whose central angle with respect to the photographing optical axis O is in the range of 15 degrees forward and backward with the reference plane P1 in between.

  A comparative example different from the present embodiment is shown in FIG. In this comparative example, the rotation shaft 37 ′ that pivotally supports the insertion / removal frame 20 ′ is disposed outside the effective axis region K and the range W in FIG. 21, and the insertion / removal frame is at the insertion position indicated by the solid line in FIG. When 20 ′ is held, the center of gravity of the anti-vibration frame (not shown in FIG. 22) that supports the insertion / removal frame 20 ′ is positioned at G2. The center of gravity G2 is at a biased position outside the range W in FIG. For this reason, when thrust is applied to the X-axis and Y-axis by the electromagnetic actuator, a force for rotating the vibration-isolating frame around the center of gravity G2 acts greatly, and the operation accuracy of the vibration-isolating frame is likely to be adversely affected.

  As described above, the rotation shaft 37 of the insertion / removal frame 20 is arranged at a position where the weight balance is improved with respect to the permanent magnets 31 and 32, thereby reducing the load when the vibration isolation frame 18 is driven for vibration isolation. Highly accurate anti-vibration control can be realized.

  As mentioned above, although demonstrated based on illustration embodiment, this invention is not limited to this. For example, the anti-vibration lens unit 14 of the illustrated embodiment employs a moving magnet type electromagnetic actuator that supports the permanent magnets 31 and 32 on the anti-vibration frame 18, but the coils 33 and 34 on the anti-vibration frame 18. It can also be applied to a moving coil type electromagnetic actuator that supports Like the permanent magnets 31 and 32, the coils 33 and 34 are also supported on the vibration isolating frame 18 at a position eccentric from the photographing optical axis O, so the insertion / removal frame 20 is arranged at a position with a good weight balance with respect to the coils 33 and 34. By doing so, the same effect as the illustrated embodiment can be obtained.

  Further, the means for operating the insertion / removal frame 20 between the insertion position and the separation position can be different from that of the illustrated embodiment. For example, in the illustrated embodiment, the insertion / removal frame 20 is rotated from the insertion position to the separation position by pressing the pressed portion 20 e with the separation drive lever 40, but light is applied to the image sensor holder that holds the image sensor 17. A projection that protrudes forward in the axial direction may be provided, and when the third group moving ring 8 moves rearward in the optical axis direction, the insertion / removal frame 20 may be pressed by the projection. In the illustrated embodiment, since the shutter unit 16 is disposed behind the anti-vibration lens unit 14 in the third group moving ring 8, when the insertion / removal frame 20 is pressed by the protrusion provided on the image sensor holder, It is preferable to arrange such that interference with the shutter unit 16 does not occur.

DESCRIPTION OF SYMBOLS 1 Zoom lens barrel 8 3 group moving ring 10 Straight guide ring 11 Cam ring 14 Anti-vibration lens unit 16 Shutter unit 18 Anti-vibration frame (anti-vibration moving member)
20 Insertion / removal frame (insertion / removal member)
20a Lens holding cylinder part (holding part)
20b Shaft hole (shaft support)
20c Arm part 20d Stopper contact part 22 Sensor holder (support member)
24 Coil base (support member)
28 Guide ball 30 Tension spring 31 32 Permanent magnet 33 34 Coil 35 36 Magnetic sensor 37 Rotating shaft 38 Insertion urging spring 40 Detachment drive lever 42 Mounting screw 44 Compression spring 46 Lever urging spring K Effective axis region L1 First lens group L2 Second lens group L3 Third lens group L4 Fourth lens group O Shooting optical axis P1 Reference plane (first reference plane)
P2 reference plane (second reference plane)
Q1 Q2 Magnetic boundary line

Claims (6)

An anti-vibration moving member supported so as to be movable along a plane perpendicular to the optical axis of the photographing optical system with respect to the supporting member;
An actuator that drives the vibration-proof moving member; and an optical element that constitutes the photographing optical system, and the optical element is positioned on the optical axis of the photographing optical system around a rotation axis that is parallel to the optical axis. An insertion / removal member supported on the anti-vibration moving member so as to be swingable between an insertion position to be removed and a separation position for removing the optical element from the optical axis;
With
The actuator is perpendicular to a magnetic force boundary line of a permanent magnet provided on the other of the support member and the anti-vibration moving member by energizing a coil provided on one of the support member and the anti-vibration moving member. The permanent magnet is provided with a voice coil motor that generates thrust in any direction, and the two permanent magnets are provided in a plane perpendicular to the optical axis so that the directions of the magnetic boundary lines are orthogonal to each other, and parallel to the optical axis. Two coils are provided opposite the two permanent magnets in any direction;
The two permanent magnets are arranged substantially symmetrically with respect to a first reference plane including the optical axis, and each of the permanent magnets passes through the optical axis and moves away from a second reference plane perpendicular to the first reference plane. The boundary line of magnetic force is inclined in a direction approaching the first reference plane; and when viewed along the optical axis, the rotation axis of the insertion / removal member has both side regions sandwiching the second reference plane. Are provided in a region opposite to the side on which the two permanent magnets and the two coils are provided, and the central angle with respect to the optical axis is the first reference in the region. Be placed in a 15 degree region on both sides of the plane;
An optical element position control device. 2. The position control device for an optical element according to claim 1, wherein the insertion / removal member includes a holding part for holding the optical element, a shaft support part supported by the rotating shaft, the holding part, and the shaft support part. An optical element position control device comprising: an arm portion to be connected, wherein the arm portion extends along the first reference plane when the insertion / removal member is in the insertion position. 3. The position control apparatus for an optical element according to claim 1, wherein the direction of thrust acting through the center of the set of permanent magnets and the coil constituting the voice coil motor and the set of permanent magnets and coils is determined. An optical element that passes through the center of the coil and the other set of permanent magnets and the coil and that faces the direction of the thrust of the set of permanent magnets and coils intersects on the first reference plane. Position control device. 4. The position control device for an optical element according to claim 1, wherein the vibration-proof moving member is positioned in a direction in which thrust is generated by the set of the permanent magnets and the coil constituting the voice coil motor. 5. And a second sensor for detecting the position of the anti-vibration moving member in the direction of the thrust of the other set of the permanent magnet and the coil, and the first sensor A position control device for an optical element, wherein a line along a position detection direction and a line along a position detection direction by the second sensor intersect on the optical axis. 5. The position control apparatus for an optical element according to claim 1, wherein the two anti-vibration moving members are provided with the two permanent magnets, and the support member is provided with the two coils. Control device. 6. The position control apparatus for an optical element according to claim 1, wherein the optical element is a lens group.

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