JP2017083575A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain an imaging device that allows a magnet and yoke constituting an anti-tremor drive unit to be arranged in a saved space, and is excellent in productivity.SOLUTION: A magnet and yoke forming a magnet circuit are supported by any one of a movable member supporting an anti-tremor optical element and a fixing member movably supporting the movable member, and a coil is supported by the other one thereof. The movable member or fixing member supporting the magnet and yoke comprises: a support section that supports the yoke; and a protrusion section that protrudes from the support section. The yoke comprises: a bottom section that is supported to the support section; a hole section that is formed in the bottom section and positions the yoke by allowing the protrusion section to be inserted through; and a plurality of upright wall sections that protrudes toward a coil side from the bottom section. A drive unit comprises at least two magnets, in which the two magnets are supported on the bottom section of the yoke with the magnets spaced apart across the protrusion section, and are further supported so as to face the plurality of upright wall sections of the yoke.SELECTED DRAWING: Figure 12

Description

  The present invention relates to an imaging apparatus provided with an image stabilization (image blur correction) mechanism.

  In recent imaging apparatuses, an anti-vibration mechanism for reducing image blur caused by camera shake or the like is generally mounted. The anti-vibration mechanism shifts the imaging optical system and the imaging element with respect to the optical axis so as to detect the vibration and posture change applied to the imaging device and cancel the influence (movement along a plane perpendicular to the optical axis). Or tilting (tilting with respect to the optical axis). As an anti-vibration driving actuator for driving the imaging optical system and the imaging element, a voice coil motor having excellent responsiveness is used.

  A voice coil motor for image stabilization driving in an image pickup apparatus is provided with a magnet on one of a movable member holding an optical element that operates during image stabilization and a fixed member that supports the movable member, and the other is positioned in the magnetic field of the magnet. The movable member is driven by electromagnetic force generated by energizing the coil. For example, in the imaging apparatus of Patent Document 1, a lens unit supported by an outer casing is rolled with a yawing direction and a pitching direction centered on two fulcrum axes orthogonal to the optical axis of the lens, and a center centered on the optical axis of the lens. A first drive unit and a second drive unit that operate in the direction of the optical axis. Each drive unit includes a plurality of magnets attached to a rear end portion in the optical axis direction of the lens unit and an optical axis direction with respect to the magnets. It is comprised by the some coil supported on the board | substrate provided facing. In addition, as in Patent Document 2, a drive unit may be configured using a yoke that forms a magnetic circuit with a magnet.

JP 2013-246414 A JP 2010-128384 A

  In a conventional voice coil motor for image stabilization driving in an image pickup apparatus, a configuration in which a magnet or a yoke is inserted and fixed inside a hole or groove formed in a fixed member or a movable member is generally used. However, in order to form a hole or a groove, it is necessary to provide a holding portion that surrounds the outside of the magnet or yoke with a predetermined thickness, which causes an increase in the size of the movable member or the fixed member. In addition, the magnet and yoke are fixed to the movable member and fixed member by bonding, etc., but an area for bonding that can efficiently fix both the magnet and coil without securing the size of the movable member or fixed member is secured. It was difficult to do.

  In addition, when using a plurality of magnets for the voice coil motor for anti-vibration driving, the magnets are attracted to each other at the assembly stage, or the magnets are attracted to the yoke at inappropriate positions, In some cases, it was difficult to manage the positional accuracy (interval) between magnets. In particular, in the case of a magnet having a very strong magnetic force, once it is attracted, it takes time to remove it. Therefore, there is a demand for improvement in workability in the manufacturing stage when using a plurality of magnets.

  Moreover, in the imaging apparatus of patent document 1, since the voice coil motor is comprised by arranging the lens unit and the substrate side by side in the optical axis direction, there is a problem that the imaging apparatus becomes large in the optical axis direction.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an imaging apparatus that can arrange a magnet and a yoke constituting a vibration-proof drive unit in a space-saving manner and is excellent in productivity. To do.

  The present invention includes a movable member that supports at least a part of an imaging unit that obtains a subject image, a fixed member that movably supports the movable member, and a drive unit that applies a thrust to the movable member to perform image blur correction. The present invention relates to an imaging device. The drive unit has a magnet and a yoke that are supported by one of the movable member and the fixed member to form a magnetic circuit, and a coil that is supported by the other of the movable member and the fixed member, and generates thrust by energizing the coil. Is subject to application. The movable member or the fixed member that supports the magnet and the yoke includes a support portion that supports the yoke and a protruding portion that protrudes from the support portion. The yoke includes a bottom portion supported by the support portion, a hole portion that is formed on the bottom portion and allows the protruding portion to be inserted to determine the position of the yoke, and a plurality of standing wall portions that protrude from the bottom portion toward the coil side. The drive unit includes at least two magnets, and the two magnets are supported on the bottom portion of the yoke so as to be spaced apart from each other with the protruding portion interposed therebetween, and are held to face the plurality of standing wall portions of the yoke.

  It is preferable that the two magnets constituting the drive unit have an elongated shape and are supported by the yoke in a parallel arrangement in which the longitudinal directions thereof are substantially parallel to each other and the projecting portions are sandwiched in the short direction.

  In this case, it is preferable that the projecting portion is shorter than each magnet in the longitudinal direction of the two magnets, and there is a gap between the two magnets except in a region sandwiching the projecting portion. An adhesive fixing part for fixing each magnet to the protruding part and the yoke by an adhesive may be provided in the gap.

  The yoke is provided with a pair of standing wall portions at positions facing the both end surfaces in the longitudinal direction of the two magnets, and two side surfaces opposite to the side surfaces of the two magnets facing each other across the protruding portion. Any form including a pair of standing wall portions at the position can be selected.

  The bottom of the yoke has a curved shape along a cylindrical surface centered on the optical axis of the optical system constituting the imaging means, and the standing wall of the yoke projects in the radial direction centered on the optical axis with respect to the bottom. By making each magnet a curved shape along the bottom of the yoke, the drive unit can be made compact in the optical axis direction, and the space efficiency of the drive unit around the imaging optical system can be increased.

  As an example, the three drive units are provided with different positions in the circumferential direction around the optical axis, and the first drive unit and the second drive unit are two units that change the inclination of the optical axis with respect to the movable member. If thrust in different directions is applied and the third drive unit is set to apply thrust in the rotational direction about the optical axis to the movable member, vibration-proof drive with a high degree of freedom of operation can be realized. In this case, it is preferable that the bottoms of the three yokes constituting the three drive units are located on the same cylindrical surface with the optical axis as the center.

  It is preferable to provide a supporting means for movably supporting the movable member with respect to the fixed member at a circumferential position between the three driving units.

  The present invention can be applied to an image pickup apparatus including any one of a type in which a magnet and a yoke operate with a movable member and a type in which a coil operates with a movable member. The former type is excellent in that the load of the electrical connection means connected to the coil does not affect the movable member and the drive unit.

  According to the present invention, the position of the yoke is determined by the protrusion provided on the movable member or the fixed member, and the two magnets are held on the yoke by using the protrusion, the bottom, and the plurality of standing walls. The imaging device can be made compact by arranging the magnets and yokes constituting the drive unit in a space-saving manner. In addition, it is easy to perform the work of assembling the yoke and magnet, and the productivity of the imaging apparatus can be improved.

It is a front perspective view which shows the external appearance of the imaging device to which this invention is applied. It is a back perspective view of an imaging device. It is a front view of an imaging device. It is a rear view of an imaging device. It is a rear view of an imaging device in the state where a ball holder was removed. FIG. 4 is a view taken along arrow VI in FIG. 3. It is a VII arrow line view of FIG. It is a VIII arrow line view of FIG. It is sectional drawing which follows the IX line of FIG. It is a front perspective view of the state where the imaging device was disassembled. It is a back perspective view of the state where the imaging device was disassembled. It is a front perspective view of the state which disassembled the movable unit. It is a front view of the state which decomposed | disassembled the movable unit. It is a back perspective view of the state where the movable unit was disassembled. It is a rear view of the state which disassembled the movable unit. It is a front view of a movable unit. It is a rear view of a movable unit. It is a XVIII arrow directional view of FIG. It is the XIX arrow directional view of FIG. It is a XX arrow line view of FIG. It is a XXI arrow line view of FIG. It is sectional drawing which follows the XXII line of FIG. It is a front perspective view of the state which combined the movable unit, the lens-barrel, and the image sensor unit. It is a back perspective view of the state which combined the movable unit, the lens-barrel, and the image sensor unit. It is a front perspective view of the state which disassembled the fixed unit. It is a front view of the state which decomposed | disassembled the fixing unit. It is a back perspective view of the state where the fixed unit was disassembled. It is a rear view of the state which decomposed | disassembled the fixing unit. It is the figure which looked at the fixed unit in a completed state along the XXIX arrow line of FIG. It is sectional drawing which follows the XXX line of FIG. It is a front perspective view of a fixed unit. It is a back perspective view of a fixed unit. It is a figure of the state which removed the lens-barrel, the image sensor unit, and the coil support plate from FIG. It is sectional drawing which follows the XXXIV line of FIG. It is a front perspective view of the movable unit of a 2nd embodiment. It is a front perspective view of the state which disassembled the movable unit. It is a back perspective view of the state which decomposed | disassembled the movable unit. It is a perspective view which shows the single-piece | unit shape of the yoke holding a 1st magnet unit in 2nd Embodiment. It is the figure which looked at the state which combined the 1st magnet unit with the yoke shown in FIG. 38 from the outer-diameter side. It is the figure which looked at the state which combined the 1st magnet unit with the yoke shown in FIG. 38 from the inner diameter side. It is a XLI arrow line view of FIG. It is the figure which looked at the state which isolate | separated the 1st magnet unit and the yoke from the same direction as FIG. It is a perspective view of the movable unit of 3rd Embodiment. It is a perspective view of the state which decomposed | disassembled the movable unit. It is the perspective view which looked at the state which decomposed | disassembled the movable unit from the opposite side of FIG. It is a perspective view of the state which combined the yoke and magnet unit of 3rd Embodiment. It is a top view of the movable unit of a 3rd embodiment. It is a XLVIII arrow directional view of FIG. It is a XLIX arrow directional view of FIG.

  Hereinafter, an imaging device 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings. The imaging device 10 includes an imaging optical system L and an image sensor unit 19 as imaging means for obtaining a subject image. “O” in the figure is the optical axis of the imaging optical system L. In the following description, the direction along the optical axis O (the direction in which the optical axis O and its extension line extend, or a straight line parallel to the optical axis O extends). Direction) is the optical axis direction, the subject (object) side in the optical axis direction is the front, and the image side is the rear. Further, a radial direction centering on the optical axis O (a direction in which a straight line extending perpendicularly to the optical axis O and intersecting the optical axis O) is a radial direction, and a direction approaching the optical axis O in the radial direction is an inner diameter direction, an optical axis The direction away from O is the outer diameter direction. Further, the circumferential direction around the optical axis O is defined as the circumferential direction. Unless otherwise specified, the optical axis O means an optical axis in an initial design state in which the movable unit 17 and the lens barrel 11 described later are not tilted.

  FIGS. 1 to 4 and FIGS. 6 to 8 show the appearance of the imaging apparatus 10. As shown in FIGS. 9 to 11, the imaging apparatus 10 includes a barrel holder (movable member) 12 for inserting and supporting the lens barrel 11, and a combined body of the lens barrel 11 and the barrel holder 12 includes a coil holder 13 and a ball holder 14. It has a basic structure that is movably supported in the housing.

  As shown in FIGS. 9, 12 to 17, 22, and 34, the barrel holder 12 has an axial through portion 12 b that is a hole penetrating in the optical axis direction inside a cylindrical portion 12 a surrounding the optical axis O. doing. An annular insertion restriction flange 12c is formed near the rear end of the axial through-hole 12b so as to protrude in the inner diameter direction and reduce the inner diameter size (opening diameter) of the axial through-hole 12b.

  As shown in FIGS. 5, 9, 12 to 18, 20, 22 to 24, three swing guide surfaces (support means) 20 are formed on the outer surface of the cylindrical portion 12 a of the barrel holder 12. Yes. The three swing guide surfaces 20 are provided at different positions in the circumferential direction, and are distinguished by reference numerals 20A, 20B, and 20C. Each of the swing guide surfaces 20A, 20B, and 20C is a part of the same spherical surface with a predetermined point on the optical axis O as the center, and the center of this spherical surface is the spherical center swing center Q (FIGS. 9 and 22). And The swing guide surfaces 20A, 20B, and 20C have substantially the same width in the circumferential direction, and are arranged at substantially equal intervals (120 degree intervals) in the circumferential direction.

  As shown in FIGS. 9, 11, 14, 15, 17 to 22, and 24, the rear end surface of the barrel holder 12 is provided with a plurality of tilt limiting protrusions 30 that protrude rearward in the optical axis direction. Yes. The tilt limiting protrusions 30 are a pair of tilt limiting protrusions 30A and 30B provided at the circumferential positions on both sides of the swing guide surface 20A, and a pair of tilt limits provided at the circumferential positions on both sides of the swing guide surface 20B. It consists of a total of six projections 30C, 30D and a pair of tilt limiting projections 30E, 30F provided at circumferential positions on both sides of the swing guide surface 20C. Each tilt limiting projection 30 is a projection having a hemispherical tip (end on the rear side in the optical axis direction), and the amount of protrusion from the rear end surface of the barrel holder 12 is substantially equal (see FIGS. 18 to 22).

  As shown in FIGS. 10 to 18, 21 to 24, and 34, a pair of roll range limiting protrusions 31 that are spaced apart in the circumferential direction are provided on the swing guide surface 20 </ b> A of the barrel holder 12. The swing guide surface 20A, which is a part of a spherical surface centered on the spherical center swing center Q (FIGS. 9 and 22), has a distance from the optical axis O as it advances from the front end and the rear end to the center in the optical axis direction. The pair of roll range restricting protrusions 31 become larger in the vicinity of the center in the optical axis direction where the distance of the swing guide surface 20A from the optical axis O is the largest (substantially perpendicular to the optical axis O and the center of rotation of the spherical center Q On a plane passing through In other words, the roll range limiting projection 31 is provided at the most protruding portion in the outer diameter direction of the swing guide surface 20A.

  As shown in FIGS. 12 to 17 and FIG. 34, the barrel holder 12 has three support seats 21, 22, and 23 at circumferential positions between the three swing guide surfaces 20A, 20B, and 20C. The support seat 21 is positioned between the swing guide surface 20A and the swing guide surface 20C, the support seat 22 is positioned between the swing guide surface 20A and the swing guide surface 20B, and the support seat 23 is the swing guide surface. It is located between 20B and the swing guide surface 20C. The support seats 21, 22, and 23 protrude in the outer diameter direction from the support surfaces 21a, 22a, and 23a, which are part of the same cylindrical surface with the optical axis O as the center, and the support surfaces 21a, 22a, and 23a, respectively. It has magnet support protrusions 21b, 22b, and 23b. A pair of support surfaces 21a, 22a, and 23a are provided at both ends in the circumferential direction of the support seats 21, 22, and 23, respectively, and a recess is formed between each pair of support surfaces 21a, 22a, and 23a.

  As shown in FIGS. 10 to 15, 18, 18, 20, 21, 23, 24, and 34, the magnet support protrusion 21b and the magnet support protrusion 22b have a small thickness in the optical axis direction and are elongated in the circumferential direction. These are plate-like protrusions that are directed to each other, and their shapes are substantially common. The front and rear surfaces of the magnet support protrusion 21b and the magnet support protrusion 22b in the optical axis direction are substantially parallel to each other and are substantially perpendicular to the optical axis O. The magnet support protrusions 21b and the magnet support protrusions 22b are located at approximately the center of the support seat 21 and the support seat 22 in the optical axis direction. As shown in FIGS. 5, 9, 12 to 17, 19, 22, 33, and 34, the magnet support protrusion 23 b has a plate shape with a small thickness in the circumferential direction and a longitudinal direction in the optical axis direction. Is a protrusion. Both side surfaces in the circumferential direction of the magnet support protrusion 23b are flat surfaces that are substantially parallel to each other and extend in the optical axis direction. The magnet support protrusion 23b is located at the approximate center of the support seat 23 in the circumferential direction.

  The three support seats 21, 22, and 23 have substantially the same shape of the base portions (support surfaces 21a, 22a, and 23a) except for the magnet support protrusions 21b, 22b, and 23b, and the base portions are substantially equidistant in the circumferential direction. (120 degree intervals). As shown in FIGS. 12 to 24 and 34, the yoke 24 is supported on the support seat 21, the yoke 25 is supported on the support seat 22, and the yoke 26 is supported on the support seat 23. Each of the yokes 24, 25, and 26 is formed of a metal magnetic material, and the curved bottom walls 24a, 25a, and 26a along the support surfaces 21a, 22a, and 23a, and the circumferential direction of the bottom walls 24a, 25a, and 26a. A pair of standing walls 24b, 25b, and 26b projecting in the outer diameter direction from the both ends of each. Long holes 24c and 25c are formed in the bottom wall 24a of the yoke 24 and the bottom wall 25a of the yoke 25 so as to extend in the circumferential direction. The bottom wall 26a of the yoke 26 has a longitudinal direction in the optical axis direction. An elongated hole 26c is formed through. The long hole 24c and the long hole 25c have shapes into which the magnet support protrusion 21b and the magnet support protrusion 22b can be inserted, respectively, and the long hole 26c has a shape into which the magnet support protrusion 23b can be inserted. Each of the magnet support protrusions 21b, 22b, and 23b has a cross-sectional shape that is inserted into the corresponding elongated holes 24c, 25c, and 26c without rattling, and the yokes 24, 25, and 26 with respect to the barrel holder 12 in this inserted state. The positions in the optical axis direction and the circumferential direction are determined. The three yokes 24, 25, 26 have a substantially common shape with respect to the bottom walls 24a, 25a, 26a and the standing walls 24b, 25b, 26b, and only the shape of the long hole 26c with respect to the long hole 24c and the long hole 25c. Is different.

  As shown in FIGS. 16, 17, and 34, the yokes 24, 25, and 26 are supported by placing the inner peripheral surfaces of the curved bottom walls 24a, 25a, and 26a on the support surfaces 21a, 22a, and 23a, respectively. 21, 22 and 23 are supported. At this time, the magnet support protrusions 21b, 22b, and 23b protrude in the outer diameter direction through the long holes 24c, 25c, and 26c, respectively. In a state where the yokes 24, 25, and 26 are supported on the support seats 21, 22, and 23, the bottom walls 24a, 25a, and 26a are positioned on the same cylindrical surface with the optical axis O as the center. As shown in FIGS. 18 to 24, the length of the yokes 24, 25, and 26 in the optical axis direction is substantially the same as the length of the barrel holder 12 in the optical axis direction, and the magnet support protrusions 21b, 22b, and 23b With the positions determined by the engagement of the long holes 24c, 25c, and 26c, the positions of the front edges of the yokes 24, 25, and 26 and the front end surface of the barrel holder 12 in the optical axis direction overlap, and the yokes 24, 25, and 26 The edge portion and the position of the rear end surface of the barrel holder 12 in the optical axis direction overlap.

  As shown in FIGS. 10 to 18, 20, 21, 23, 24, and 34, the first magnet unit 27 is supported on the yoke 24, and the second magnet unit 28 is supported on the yoke 25. The The first magnet unit 27 is composed of a pair of permanent magnets 27-1 and 27-2 having a circular arc shape with the longitudinal direction oriented in the circumferential direction, and the second magnet unit 28 is also oriented in the circumferential direction in the same manner. It consists of a pair of permanent magnets 28-1 and 28-2 that form a circular arc shape. The permanent magnet 27-1 and the permanent magnet 27-2 have the same shape, and have a larger diameter than the inner peripheral surface 27 a that is a part of the cylindrical surface centered on the optical axis O and the cylindrical surface including the inner peripheral surface 27 a. It has the outer peripheral surface 27b which is a part of concentric cylindrical surface. Each of the permanent magnet 27-1 and the permanent magnet 27-2 has a pair of longitudinal end surfaces 27c that are located at both ends in the longitudinal direction and that radially connect the inner peripheral surface 27a and the outer peripheral surface 27b, and a pair of longitudinal directions. It has a pair of side surfaces 27d and 27e extending in the longitudinal direction between the end surfaces 27c and connecting the inner peripheral surface 27a and the outer peripheral surface 27b in the radial direction. The permanent magnet 28-1 and the permanent magnet 28-2 are both magnets having the same shape as the permanent magnet 27-1 and the permanent magnet 27-2, and have the same inner peripheral surface 28a as the permanent magnets 27-1, 27-2, It has an outer peripheral surface 28b, a pair of longitudinal end surfaces 28c, and a pair of side surfaces 28d and 28e.

  The first magnet unit 27 is arranged in parallel in the optical axis direction (the short direction of the permanent magnet 27-1 and the permanent magnet 27-2) so that the permanent magnet 27-1 is the front and the permanent magnet 27-2 is the rear. Arranged on the yoke 24. As shown in FIGS. 16 to 18, 21, 23, 24, and 34, the inner peripheral surfaces 27 a of the permanent magnet 27-1 and the permanent magnet 27-2 are placed on the bottom wall 24 a, The pair of longitudinal end surfaces 27c oppose the pair of standing walls 24b. The inner peripheral surface 27a is a curved surface along the bottom wall 24a, and the permanent magnet 27-1 and the permanent magnet 27-2 are stably supported in the radial direction by contact between the inner peripheral surface 27a and the bottom wall 24a. Further, the circumferential positions of the permanent magnet 27-1 and the permanent magnet 27-2 are determined by sandwiching the pair of longitudinal end faces 27c between the pair of standing walls 24b. Further, the permanent magnet 27-1 and the permanent magnet 27-2 are optically sandwiched between the side surface 27e of the permanent magnet 27-1 and the side surface 27d of the permanent magnet 27-2 by sandwiching the magnet support projection 21b protruding through the long hole 24c. Axially spaced apart at a predetermined interval in the axial direction. The magnet support protrusion 21b is shorter in the circumferential direction than the permanent magnet 27-1 and the permanent magnet 27-2, and the magnet support protrusion 21b is sandwiched near the longitudinal center of the permanent magnet 27-1 and the permanent magnet 27-2. An adhesive injection space (gap) M1 is formed between the side surface 27e of the permanent magnet 27-1 and the side surface 27d of the permanent magnet 27-2 (FIGS. 18 and 21). In the state supported by the yoke 24 and the magnet support projection 21b, the side surface 27d of the permanent magnet 27-1 is at substantially the same optical axis position as the front end surface of the barrel holder 12 (the front edge portion of the yoke 24). The second side surface 27e is located at substantially the same position in the optical axis direction as the rear end surface of the barrel holder 12 (the rear edge portion of the yoke 24) (FIGS. 18, 21, 23, and 24). That is, the sum of the widths of the permanent magnet 27-1, the magnet support projection 21b, and the permanent magnet 27-2 in the optical axis direction is substantially equal to the length of the barrel holder 12 and the yoke 24 in the optical axis direction. The unit 27 is supported without protruding in front of and behind the barrel holder 12.

  The second magnet unit 28 is arranged in parallel in the optical axis direction (the short direction of the permanent magnet 28-1 and the permanent magnet 28-2) so that the permanent magnet 28-1 is the front and the permanent magnet 28-2 is the rear. Arranged on the yoke 25. As shown in FIGS. 16 to 18, 20, 23, 24, and 34, the inner peripheral surfaces 28 a of the permanent magnet 28-1 and the permanent magnet 28-2 are placed on the bottom wall 25 a, The pair of longitudinal end faces 28c oppose the pair of standing walls 25b. The inner peripheral surface 28a is a curved surface along the bottom wall 25a, and the permanent magnet 28-1 and the permanent magnet 28-2 are stably supported in the radial direction by contact between the inner peripheral surface 28a and the bottom wall 25a. Further, the circumferential positions of the permanent magnet 28-1 and the permanent magnet 28-2 are determined by sandwiching the pair of longitudinal end faces 28c between the pair of standing walls 25b. Further, the permanent magnet 28-1 and the permanent magnet 28-2 are made light by sandwiching the magnet support projection 22b protruding through the long hole 25c between the side surface 28e of the permanent magnet 28-1 and the side surface 28d of the permanent magnet 28-2. Axially spaced apart at a predetermined interval in the axial direction. The magnet support projection 22b is shorter in the circumferential direction than the permanent magnet 28-1 and the permanent magnet 28-2, and the magnet support projection 22b is sandwiched near the longitudinal center of the permanent magnet 28-1 and the permanent magnet 28-2. An adhesive injection space (gap) M2 is formed between the side surface 28e of the permanent magnet 28-1 and the side surface 28d of the permanent magnet 28-2 (FIGS. 18, 20, 23, and 24). In the state supported by the yoke 25 and the magnet support protrusion 22b, the side surface 28d of the permanent magnet 28-1 is substantially at the same position in the optical axis direction as the front end surface of the barrel holder 12 (the front edge portion of the yoke 25). The second side surface 28e is located at substantially the same position in the optical axis direction as the rear end surface of the barrel holder 12 (the rear edge portion of the yoke 25) (FIGS. 18, 20, 23, and 24). That is, the sum of the widths of the permanent magnet 28-1, the magnet support protrusion 22b, and the permanent magnet 28-2 in the optical axis direction is substantially equal to the length of the barrel holder 12 and the yoke 25 in the optical axis direction. The unit 28 is supported without protruding forward and backward of the barrel holder 12.

  As shown in FIGS. 9 to 17, 19, 20, 22 to 24, and 34, the third magnet unit 29 is supported on the yoke 26. The third magnet unit 29 includes a pair of permanent magnets 29-1 and 29-2 whose longitudinal direction is directed in the optical axis direction. The permanent magnet 29-1 and the permanent magnet 29-2 have the same shape, and have a larger diameter than the inner peripheral surface 29a, which is a part of the cylindrical surface centered on the optical axis O, and the cylindrical surface including the inner peripheral surface 29a. It has the outer peripheral surface 29b which is a part of concentric cylindrical surface. Each of the permanent magnet 29-1 and the permanent magnet 29-2 is located at both ends in the longitudinal direction and has a pair of longitudinal end surfaces 29c that connect the inner peripheral surface 29a and the outer peripheral surface 29b in the radial direction, and a pair of longitudinal directions. It has a pair of side surfaces 29d and 29e that extend in the longitudinal direction between the end surfaces 29c and connect the inner peripheral surface 29a and the outer peripheral surface 29b in the radial direction.

  Unlike the first magnet unit 27 and the second magnet unit 28, the third magnet unit 29 has a permanent magnet 29-1 and a permanent magnet 29-2 arranged in the circumferential direction (the short sides of the permanent magnet 29-1 and the permanent magnet 29-2). Arranged on the yoke 26 in parallel. As shown in FIGS. 9, 16, 17, 19, 22 to 24, and 34, the inner peripheral surfaces 29a of the permanent magnet 29-1 and the permanent magnet 29-2 are mounted on the bottom wall 26a. The side surface 29d of the permanent magnet 29-1 faces one of the pair of standing walls 26b, and the side surface 29e of the permanent magnet 29-2 faces the other of the pair of standing walls 26b. The inner peripheral surface 29a is a curved surface along the bottom wall 26a, and the permanent magnet 29-1 and the permanent magnet 29-2 are stably supported in the radial direction by contact between the inner peripheral surface 29a and the bottom wall 26a. The permanent magnet 29-1 and the permanent magnet 29-2 are circumferentially sandwiched between the side surface 29e of the permanent magnet 29-1 and the side surface 29d of the permanent magnet 29-2 by sandwiching the magnet support protrusion 23b protruding through the long hole 26c. They are spaced in parallel at a predetermined interval. The magnet support protrusion 23b is shorter in the optical axis direction than the permanent magnet 29-1 and the permanent magnet 29-2, and the magnet support protrusion 23b is sandwiched near the center in the longitudinal direction of the permanent magnet 29-1 and the permanent magnet 29-2. Thus, an adhesive injection space (gap) M3 is formed between the side surface 29e of the permanent magnet 29-1 and the side surface 29d of the permanent magnet 29-2 (FIGS. 19 and 22). The permanent magnet 29-1 and the permanent magnet 29-2 sandwiching the magnet support protrusion 23b are sandwiched from both sides by a pair of standing walls 26b, and the circumferential position of the third magnet unit 29 is determined. In other words, the sum of the circumferential widths of the permanent magnet 29-1, the magnet support projection 23b, and the permanent magnet 29-2 is substantially equal to the distance between the pair of standing walls 26b of the yoke 26 in the circumferential direction. . The lengths of the permanent magnet 29-1 and the permanent magnet 29-2 in the optical axis direction (the distance between the pair of longitudinal end surfaces 29c) are substantially the same as the lengths of the barrel holder 12 and the yoke 26 in the optical axis direction. Each of the permanent magnet 29-1 and the permanent magnet 29-2 is supported without a pair of longitudinal end faces 29c overlapping the front and rear end faces (front and rear edges of the yoke 26) of the barrel holder 12, and projecting forward and backward. (FIG. 19, FIG. 22).

  Adhesive is injected into each of the adhesive injection spaces M1, M2, and M3. The yoke 24 and the first magnet unit 27 are fixed to the barrel holder 12 (magnet support protrusion 21b) by the adhesive injected into the adhesive injection space M1, and the yoke 25 and the first magnet unit 27 are fixed by the adhesive injected into the adhesive injection space M2. The two magnet unit 28 is fixed to the barrel holder 12 (magnet support protrusion 22b), and the yoke 26 and the third magnet unit 29 are fixed to the barrel holder 12 (magnet support protrusion 23b) by the adhesive injected into the adhesive injection space M3. Fixed. That is, the magnets constituting the magnet units 27, 28, and 29 are bonded and fixed to the magnet support protrusions 21b, 22b, and 23b and the yokes 24, 25, and 26 in the adhesive injection spaces M1, M2, and M3, respectively. An adhesive fixing part is formed.

  By assembling the yokes 24, 25, and 26 and the magnet units 27, 28, and 29 to the barrel holder 12 as described above, the movable unit 17 that is the subassembly shown in FIGS. In the movable unit 17, a set of the yoke 24 and the first magnet unit 27 (including the magnet support protrusion 21b), a set of the yoke 25 and the second magnet unit 28 (including the magnet support protrusion 22b), the yoke 26 and the third Each set of the magnet units 29 (including the magnet support protrusions 23b) has substantially the same size in the circumferential direction and the optical axis direction, and these three sets are arranged at substantially equal intervals (120 degree intervals) in the circumferential direction.

  As shown in FIGS. 5, 16, 17, and 34, the magnet units 27, 28, and 29 in the movable unit 17 are the same cylinders whose outer peripheral surfaces 27 b, 28 b, and 29 b are centered on the optical axis O. The inner peripheral surfaces 27a, 28a, and 29a are positioned on different cylindrical surfaces that are positioned on the surface and have a diameter smaller than that of the cylindrical surface including the outer peripheral surfaces 27b, 28b, and 29b and centered on the optical axis O. .

  The N and S poles of the permanent magnets constituting the first magnet unit 27, the second magnet unit 28, and the third magnet unit 29 in the movable unit 17 are shown as “N” and “S” in FIG. 13 and FIGS. "Conceptually." Each permanent magnet is magnetized so that the N pole and the S pole are aligned in the radial direction. The permanent magnet 27-1, the permanent magnet 28-2, and the permanent magnet 29-1 have an S inner diameter side and an N outer diameter side, respectively. The permanent magnet 27-2, the permanent magnet 28-1, and the permanent magnet 29-2 each have an N-pole on the inner diameter side and an S-pole on the outer diameter side. Each magnet unit 27, 28, 29 is divided into two permanent magnets arranged in parallel in the short direction, so that each magnet unit 27, 28, 29 is worn more than a single large permanent magnet. It is easy to magnetize and is advantageous in terms of weight reduction.

  As shown in FIGS. 9, 25 to 28, and 30 to 32, the coil holder 13 has an axial penetration portion 13 b that penetrates in the optical axis direction inside a cylindrical portion 13 a that surrounds the optical axis O. Yes. A front wall 13c protruding in the inner diameter direction is formed at the front end of the coil holder 13, and the circular central opening 13d formed as the inner edge portion of the front wall 13c has a smaller opening diameter than the axial through-hole 13b.

  As shown in FIGS. 5, 9 to 11, 25 to 28, 30 to 32, and 34, the coil holder 13 has an inner diameter from the inner peripheral surface of the cylindrical portion 13 a in the axial direction through portion 13 b. Three support seats (support means) 40 protruding in the direction are provided. The three support seats 40 are provided at substantially equal intervals (120 degree intervals) in the circumferential direction, and are distinguished by reference numerals 40A, 40B, and 40C. Each support seat 40 has a wedge-shaped cross-sectional shape that narrows the width in the circumferential direction as it progresses in the inner diameter direction, and a ball holding groove 41 is formed at the inner end of the inner side. The ball holding groove 41 is a bottomed long groove whose longitudinal direction is oriented in the optical axis direction. The bottom surface is located in the outer diameter direction and is opened in the inner diameter direction. The rear end of the ball holding groove 41 in the optical axis direction is open, and the front end of the ball holding groove 41 is closed by a front regulating wall 41a adjacent to the front wall 13c. As shown in FIG. 9 and FIG. 30, the region near the front end of the ball holding groove 41 provided with the front regulating wall 41a has a larger protruding amount in the inner diameter direction of each support seat 40 than the rear portion thereof, The depth of the holding groove 41 is increased. A screw hole 42 having a thread groove inside is formed in the rear end surface of each support seat 40. A contact surface 43 is formed in an annular region around each screw hole 42. Each contact surface 43 is a plane that is substantially perpendicular to the optical axis O and faces rearward.

  As shown in FIGS. 9, 11, 25, 27, 28, 30, 32, and 34, the cylindrical portion 13 a of the coil holder 13 has three through holes 45 and 46 that penetrate in the radial direction. , 47 are formed. The through holes 45, 46, and 47 are located at the circumferential position between the three support seats 40, the through hole 45 is located between the support seat 40A and the support seat 40C, and penetrates between the support seat 40A and the support seat 40B. The hole 46 is located, and the through hole 47 is located between the support seat 40B and the support seat 40C. Each of the through holes 45 and 46 is a long hole having a longitudinal direction in the circumferential direction, and has a developed shape that is substantially rectangular when the cylindrical portion 13a is developed in a planar shape. The circumferential lengths of the through hole 45 and the through hole 46 are substantially equal, and the lengths of the through hole 45 and the through hole 46 in the optical axis direction are also substantially equal. The through hole 47 also has a developed shape that is substantially rectangular when the cylindrical portion 13a is developed in a planar shape, but the ratio of the circumferential length to the optical axis length is different from the through hole 45 and the through hole 46. The circumferential length of the through hole 47 is smaller than the circumferential length of the through hole 45 and the through hole 46, and the optical axis length of the through hole 47 is larger than the optical axis length of the through hole 45 and the through hole 46. When the center of the length of the through holes 45, 46, 47 in the circumferential direction is set as the reference position in the circumferential direction, the reference positions of the three through holes 45, 46, 47 are substantially equally spaced in the circumferential direction (120 degree intervals). It is a relationship.

  On the outer peripheral surface of the cylindrical portion 13 a of the coil holder 13, bottomed support concave portions 48, 49, 50 are formed around the through holes 45, 46, 47. The support recesses 48 and 49 are recesses whose longitudinal direction faces in the circumferential direction, and the circumferential length and the optical axis length are substantially equal to each other. The support recess 50 is a recess that is shorter in the circumferential direction and longer in the optical axis direction than the support recesses 48 and 49 (see FIG. 33).

  As shown in FIGS. 1, 2, 6 to 11, 25 to 29, 31, and 32, coil support plates 51, 52, and 53 are supported on the support recesses 48, 49, and 50, respectively. . The coil support plates 51, 52, 53 are curved plate-like members along the outer peripheral surface of the cylindrical portion 13 a, and are outer surfaces of the coil support plates 51, 52, 53 while being supported on the support recesses 48, 49, 50. Is substantially flush with the outer peripheral surface of the cylindrical portion 13a. That is, the coil support plates 51, 52, and 53 are located on the same cylindrical surface with the optical axis O as the center. The coil support plate 51 and the coil support plate 52 have a substantially common shape, and coil support projections 51a and 52a projecting in the inner diameter direction are formed in the vicinity of the respective centers in the circumferential direction and the optical axis direction. , 52a are provided with sensor support recesses 51b, 52b. The coil support plate 53 is shorter in the circumferential direction than the coil support plate 51 and the coil support plate 52 and is longer in the optical axis direction. Near the center of the coil support plate 53 in the circumferential direction and the optical axis direction, a coil support projection 53a that projects in the inner diameter direction is formed, and a sensor support recess 53b is formed on the back side of the coil support projection 53a. The coil support plates 51, 52, 53 are further formed with through holes 51c, 52c, 53c penetrating in the radial direction.

  The first coil 54 is supported on the coil support plate 51, the second coil 55 is supported on the coil support plate 52, and the third coil 56 is supported on the coil support plate 53. Each of the first coil 54 and the second coil 55 has an air core in which circumferential ends of each pair of long side portions 54a and 55a extending in the circumferential direction are connected by a pair of short side portions 54b and 55b extending in the optical axis direction. It is a coil. The third coil 56 is an air-core coil in which end portions in the optical axis direction of the pair of long side portions 56a extending in the optical axis direction are connected by a pair of short side portions 56b extending in the circumferential direction. The first coil 54 and the second coil 55 have substantially the same shape, the circumferential lengths of the long side portions 54a and 55a are substantially equal, and the lengths of the short side portions 54b and 55b in the optical axis direction are substantially equal. The length in the optical axis direction of the long side portion 56 a of the third coil 56 is larger than the length in the optical axis direction of the short side portions 54 b and 55 b of the first coil 54 and the second coil 55, and the short side portion 56 b of the third coil 56. The circumferential length is smaller than the circumferential lengths of the long sides 54 a and 55 a of the first coil 54 and the second coil 55. Each coil 54, 55, 56 includes a curved outer peripheral surface 54c, 55c, 56c, which is a part of a cylindrical surface along the inner peripheral surface of the coil support plate 51, 52, 53, and an outer peripheral surface 54c, 55c, 56c. It has curved inner peripheral surfaces 54d, 55d, 56d located on a cylindrical surface having a smaller diameter than the cylindrical surface.

  The first coil 54 has a coil support protrusion 51a inserted in a hollow portion surrounded by a pair of long side portions 54a and a pair of short side portions 54b, and the outer peripheral surface 54c is brought into contact with the inner peripheral surface of the coil support plate 51. Attached to the coil support plate 51. The coil support plate 51 and the first coil 54 are fixed by adhesion or the like. When the coil support plate 51 is supported on the support recess 48 of the coil holder 13 in this state, the first coil 54 is inserted into the through hole 45 and the inner peripheral surface 54d faces the inner diameter side of the coil holder 13 (FIG. 5). 32 and 34).

  The second coil 55 has a coil support protrusion 52a inserted into a hollow portion surrounded by the pair of long side portions 55a and the pair of short side portions 55b, and the outer peripheral surface 55c is brought into contact with the inner peripheral surface of the coil support plate 52. Attached to the coil support plate 52. The coil support plate 52 and the second coil 55 are fixed by bonding or the like. When the coil support plate 52 is supported on the support recess 49 of the coil holder 13 in this state, the second coil 55 is inserted into the through hole 46 and the inner peripheral surface 55d faces the inner diameter side of the coil holder 13 (FIG. 5). , FIG. 34).

The third coil 56 is formed by inserting a coil support protrusion 53a into a hollow portion surrounded by each pair of the long side portion 56a and the short side portion 56b and bringing the outer peripheral surface 56c into contact with the inner peripheral surface of the coil support plate 53. Attached to the support plate 53. The coil support plate 53 and the third coil 56 are fixed by adhesion or the like. When the coil support plate 53 is supported on the support recess 50 of the coil holder 13 in this state, the third coil 56 is inserted into the through hole 47 and the inner peripheral surface 56d faces the inner diameter side of the coil holder 13 (FIG. 5). 9, FIG. 32, FIG. 34).

  FIG. 34 shows the positional relationship between the coils 54, 55, and 56 attached to the coil holder 13 via the coil support plates 51, 52, and 53. As can be seen from FIG. 34, in each of the coils 54, 55, and 56, the outer peripheral surfaces 54c, 55c, and 56c are positioned on the same cylindrical surface with the optical axis O as the center, and the outer peripheral surfaces 54c, 55c, and 56c are The inner peripheral surfaces 54d, 55d, and 56d are located on the same other cylindrical surface that is smaller in diameter than the included cylindrical surface and that has the optical axis O as the center.

  As shown in FIGS. 1, 2, 6 to 11, 25 to 29, 31, and 32, Hall sensors (in the sensor support recesses 51 b, 52 b, and 53 b of the coil support plates 51, 52, and 53). Magnetic sensors) 57, 58 and 59 are attached. The sensor support recesses 51b, 52b, and 53b are respectively recessed using the internal spaces of the coil support protrusions 51a, 52a, and 53a that protrude in the inner diameter direction, and are recesses that are open toward the outer diameter direction. Yes. Therefore, the Hall sensors 57, 58, 59 attached in the sensor support recesses 51b, 52b, 53b are held in a state of being fitted inside the hollow portions of the coils 54, 55, 56 (see FIGS. 9 and 34). ). As shown in FIG. 34, the hall sensors 57, 58, 59 in this holding state are positioned at substantially equal intervals (120 degree intervals) in the circumferential direction, and on the same cylindrical surface centered on the optical axis O. Located (the radial distance from the optical axis O is substantially equal).

  As described above, by assembling the first coil 54, the second coil 55, the third coil 56 and the hall sensors 57, 58, 59 to the coil holder 13 through the coil support plates 51, 52, 53, FIG. The fixed unit 18 which is the subassembly shown in FIGS. 31 and 32 is configured.

  Three fixed-position balls (support means) 61 and three biasing balls (support means) 62 (FIGS. 5, 9 to 11) are inserted into the axially penetrating portion 13b of the fixed unit 18 (coil holder 13). Thus, the movable unit 17 (barrel holder 12) is supported. Each fixed-position ball 61 and each biasing ball 62 are metal spherical bodies having substantially the same diameter. One fixed-position ball 61 and one urging ball 62 are inserted into each of the ball holding grooves 41 of the three support seats 40A, 40B, and 40C provided in the coil holder 13, for a total of six fixed-position balls 61 and urging balls. The barrel holder 12 is supported at 62. Each of the three fixed-position balls 61 is held at the front end portion of the ball holding groove 41 where the front restricting wall 41 a is formed, and each of the three urging balls 62 is held near the rear end of the ball holding groove 41. The diameter of each fixed-position ball 61 and each biasing ball 62 and the groove width of the ball holding groove 41 are substantially the same, and the movement of the fixed-position ball 61 and the biasing ball 62 in the circumferential direction with respect to the ball holding groove 41 is restricted. The

  The movable unit 17 is configured such that the circumferential positions of the swing guide surfaces 20A, 20B, and 20C formed on the barrel holder 12 correspond to the support seats 40A, 40B, and 40C (opposite in the radial direction), and the axial through portion 13b. Inserted inside. Then, the swing guide surface 20A comes into contact with the fixed-position ball 61 and the urging ball 62 supported on the ball holding groove 41 of the support seat 40A, and the swing guide surface 20B is on the ball hold groove 41 of the support seat 40B. The supported fixed-position ball 61 and the biasing ball 62 are in contact with each other, and the swing guide surface 20C is in contact with the fixed-position ball 61 and the biasing ball 62 supported on the ball holding groove 41 of the support seat 40C.

  In this state, the three fixed-position balls 61 are sandwiched between the corresponding swing guide surfaces 20A, 20B, and 20C and the bottom surface of the ball holding groove 41, and further abut against the front regulation wall 41a, thereby Movement in the radial direction is restricted (position is determined). More specifically, as can be seen from FIG. 9, the fixed-position ball 61 is restricted from moving in the outer diameter direction by the bottom surface of the ball holding groove 41, and is restricted from moving forward in the optical axis direction by the front restriction wall 41a. . In the region facing the front half of the ball holding groove 41 in the optical axis direction, the swing guide surfaces 20A, 20B, and 20C have an inclination that advances from the inner diameter side to the outer diameter side as it advances from the front to the rear in the optical axis direction. (See FIGS. 9 and 22). Therefore, the fixed-position ball 61 is restricted from moving backward in the inner diameter direction and the optical axis direction by the swing guide surfaces 20A, 20B, and 20C. In other words, the rocking guide surfaces 20A, 20B, 20C, the front regulating wall 41a, and the bottom surface of the ball holding groove 41 form a wedge-shaped space whose width in the radial direction decreases from the front to the rear in the optical axis direction. In this wedge-shaped space, the fixed-position ball 61 is in a state of being fitted with its movement restricted. As described above, the fixed-position ball 61 is held at a fixed position in which movement is restricted in any of the optical axis direction, the circumferential direction, and the radial direction by assembling the movable unit 17. The fixed-position ball 61 can roll at this fixed position (rolling operation with its own center position kept constant).

  The swing guide surfaces 20A, 20B, and 20C have a slope that advances from the inner diameter side to the outer diameter side as it advances from the rear to the front in the optical axis direction in the region facing the rear half of the ball holding groove 41 in the optical axis direction. (See FIGS. 9 and 22). That is, the swinging guide surfaces 20A, 20B, and 20C are reversely inclined at the portion that contacts the fixed-position ball 61 and the portion that contacts the biasing ball 62. Therefore, when the urging ball 62 is sandwiched between the corresponding swing guide surfaces 20A, 20B, and 20C and the bottom surface of the ball holding groove 41, movement in the outer diameter direction is restricted by the bottom surface of the ball holding groove 41. In addition, the forward movement in the inner diameter direction and the optical axis direction is restricted by the swing guide surfaces 20A, 20B, and 20C. However, since the urging balls 62 are located in the vicinity of the opening at the rear end of the ball holding groove 41, the urging balls 62 are exposed at the stage where the ball holder 14 is not attached to the fixed unit 18 (see FIG. 5). Movement of each biasing ball 62 rearward in the axial direction is not restricted.

  The ball holder 14 is assembled in the axial through portion 13 b of the coil holder 13. As shown in FIGS. 9 to 11, the ball holder 14 is a disk-shaped member having a diameter that fits in the inner peripheral portion of the axial through-hole 13 b, and includes a circular central opening 14 a located in the radial center and a central opening 14 a. A plate-like lid portion 14b that surrounds the outer diameter side, and an annular outer peripheral flange 14c that protrudes forward from the outer edge portion of the lid portion 14b in the optical axis direction. Three front protrusions 65 are provided on the front surface side of the lid portion 14b at substantially equal intervals (120 degree intervals) in the circumferential direction. Each front protrusion 65 has a screw insertion hole 66 penetrating in the optical axis direction, and a ball holding surface 67 facing forward is formed on the inner diameter side of the screw insertion hole 66. Further, a tilt regulating surface 68 is formed on the front surface side of the lid portion 14b in an annular region surrounding the central opening 14a. Each of the ball holding surface 67 and the tilt regulating surface 68 is a plane substantially perpendicular to the optical axis O. As shown in FIG. 9, the screw insertion hole 66 has three different inner diameters, the largest diameter portion 66a having the largest inner diameter size and the smallest diameter portion 66b having the rearmost portion and the foremost portion in the optical axis direction. An intermediate portion 66c having an intermediate inner diameter size is formed at a position in the optical axis direction therebetween.

  The ball holder 14 is circumferentially positioned so that the three front protrusions 65 are opposed to the rear surface of the three support seats 40A, 40B, 40C of the coil holder 13 in the optical axis direction. It is inserted in from the rear in the optical axis direction. Three front protrusions 65 facing the support seats 40A, 40B, and 40C are referred to as front protrusions 65A, 65B, and 65C, respectively. The ball holder 14 inserted into the axial direction through portion 13 b is fixed to the coil holder 13 using three fixing screws 69.

  As shown in FIGS. 9 to 11, each of the three fixing screws 69 has a threaded portion 69a having a thread groove on the outer peripheral surface at one end, a head 69b at the other end, The head 69b is connected by a shaft 69c. The diameter of the head portion 69 b is larger than the inner diameter of the intermediate portion 66 c of the screw insertion hole 66 in the ball holder 14 and smaller than the inner diameter of the large diameter portion 66 a. The diameter of the shaft portion 69 c is substantially the same as the inner diameter of the small diameter portion 66 b of the screw insertion hole 66. Each fixing screw 69 is inserted into the screw insertion hole 66 from the rear in the optical axis direction with the screwing portion 69a facing forward, and the screwing portion 69a is screwed into the screw groove in the screw hole 42. As shown in FIG. 9, a cylindrical coil spring 70 surrounding the shaft portion 69c is inserted into the intermediate portion 66c of the screw insertion hole 66, and the front end portion of the coil spring 70 is a step portion between the small diameter portion 66b and the intermediate portion 66c. The rear end of the coil spring 70 contacts the head 69b of the fixed screw 69. As the screwing amount of the screwing portion 69a into the screw hole 42 increases, the coil spring 70 is compressed by pushing the head 69b, and the compressed coil spring 70 biases the ball holder 14 forward in the optical axis direction. Work.

  Each fixed screw 69 has a limit of tightening into the screw hole 42 at a position in FIG. 9 where the front end portion of the shaft portion 69 c contacts the contact surface 43 of the coil holder 13. In this state, the ball holding surfaces 67 of the front protrusions 65A, 65B, and 65C formed on the ball holder 14 abut against the urging ball 62 from the rear, and forward in the optical axis direction applied to the ball holder 14 from the coil spring 70. Each urging ball 62 receives this urging force. As shown in FIG. 9, in the vicinity of the rear end of the ball holding groove 41 in which the urging ball 62 is inserted, the bottom surface of the ball holding groove 41 and the swing guide surfaces 20A, 20B, and 20C are moved forward in the optical axis direction. The wedge-shaped space in which the radial interval is reduced and the urging ball 62 that receives the urging force from the ball holding surface 67 is pushed in a direction in which the wedge-shaped space is narrowed. The urging ball 62 is supported in a stable state. Further, the ball holding surface 67 prevents the urging ball 62 from falling backward from the ball holding groove 41. In order to ensure that the urging ball 62 and the ball holding surface 67 are in contact with each other, a slight gap between the front surface of each of the front protrusions 65A, 65B, and 65C and the contact surface 43 in the optical axis direction in the state shown in FIG. The gap is secured. Further, there is a slight gap in the optical axis direction between the step portion between the intermediate portion 66 c and the large diameter portion 66 a in the screw insertion hole 66 and the head portion 69 b of the fixed screw 69. Therefore, it is possible to slightly change the position and inclination of the ball holder 14 in the optical axis direction between the front and rear ranges regulated by the contact surface 43 and the head 69b, and thereby the positions of the three biasing balls 62 can be changed. It is possible to perform stable holding by absorbing variations in the thickness.

  As described above, the movable unit 17 (barrel holder 12) supported in the axial through-hole 13b of the fixed unit 18 (coil holder 13) via the three fixed-position balls 61 and the three urging balls 62 has each fixed While changing the contact positions of the three swing guide surfaces 20A, 20B, and 20C with respect to the position ball 61 and each biasing ball 62, a spherical center swing center that is the center of the spherical surface including the swing guide surfaces 20A, 20B, and 20C. It is possible to perform a freely rotating operation around Q. During the rotation of the movable unit 17 (barrel holder 12), the fixed position ball 61 and the urging ball 62 may roll as the position of the swing guide surfaces 20A, 20B, and 20C changes. The swing guide surfaces 20A, 20B, and 20C may slide without causing the 61 or the urging ball 62 to roll. Since the swing guide surfaces 20A, 20B, and 20C and the fixed-position balls 61 and the urging balls 62 are in a point contact relationship, the movable unit 17 can be smoothly operated with little resistance in any aspect.

  The lens barrel 11 is supported in the barrel holder 12 constituting the movable unit 17. The lens barrel 11 is a cylindrical body in which an imaging optical system L (see FIG. 9) composed of a plurality of lenses is held. As shown in FIGS. 9 to 11, the diameter of the lens barrel 11 is changed step by step as it advances in the optical axis direction, and the largest diameter portion 11a having the largest diameter is provided at the forefront portion in the optical axis direction. In addition, an intermediate portion 11b having a smaller diameter than the large-diameter portion 11a is provided behind the small-diameter portion 11c having the smallest diameter at the rearmost portion in the optical axis direction.

  The lens barrel 11 is inserted into the axial through portion 12b of the barrel holder 12 from the front with the small-diameter portion 11c facing rearward, and the step portion between the intermediate portion 11b and the small-diameter portion 11c contacts the front surface of the insertion restriction flange 12c. Thus, further insertion in the optical axis direction is restricted (FIG. 9). As shown in FIGS. 1, 2, 6 to 9, 23, and 24, in this state, the small diameter portion 11c protrudes behind the barrel holder 12 through the inside of the insertion restriction flange 12c, and the large diameter portion 11a It is located in front of the barrel holder 12 without being inserted into the axial through-hole 12b. A peripheral screw 11d (FIGS. 9 to 11) is formed on the outer peripheral surface of the small diameter portion 11c protruding rearward from the barrel holder 12, and a presser ring 15 is attached to the peripheral screw 11d. The presser ring 15 is an annular body having a thread groove on the inner peripheral surface that is screwed into the peripheral surface screw 11d. The presser ring 15 is tightened until it comes into contact with the rear surface of the insertion restricting flange 12c, so that the barrel is fixed to the barrel holder 12. 11 is fixed. As shown in FIG. 9, the opening diameter of the central opening 14a of the ball holder 14 is larger than the diameter of the presser ring 15. After the ball holder 14 is attached to the coil holder 13, the presser ring 15 can be attached and detached through the central opening 14a. It is.

  Since the large-diameter portion 11a of the lens barrel 11 and the barrel holder 12 have a radial size that does not pass through the central opening 13d of the front wall 13c of the coil holder 13, the lens barrel 11 is in the axial direction of the coil holder 13. The barrel holder 12 can be inserted into the through-hole 13b from the front in the optical axis direction, and the barrel holder 12 can be inserted into the axial through-hole 13b of the coil holder 13 from the rear in the optical axis direction. As a procedure for assembling the imaging device 10, the movable unit 17 including the barrel holder 12 is inserted into the axial penetration portion 13 b of the coil holder 13 from the rear side, and then the ball holder 14 is attached. The lens barrel 11 may be inserted from the front with respect to 12b, and the presser ring 15 is assembled through the central opening 14a of the ball holder 14 to fix the lens barrel 11 to the barrel holder 12. When mounting the movable unit 17, the circumferential position is determined so that the support seat 40 </ b> A is positioned between the pair of roll range limiting protrusions 31. Further, the fixed-position balls 61 are stored in the respective ball holding grooves 41 before the movable unit 17 is inserted into the axial direction through portion 13 b of the coil holder 13, and the urging balls 62 are inserted into the ball holding grooves 41 after the movable unit 17 is inserted. And the ball holder 14 is attached.

  The lens barrel 11 inserted in the axial through-hole 12b of the barrel holder 12 has a large-diameter portion 11a protruding forward of the coil holder 13 and a rear end portion of the small-diameter portion 11b protruding rearward of the coil holder 13. An annular balancer 16 is attached to the outer periphery of the diameter portion 11a, and an image sensor unit 19 is attached to the rear end portion of the small diameter portion 11b. The lens barrel 11 and the movable unit 17 integrally perform a freely rotating operation around the above-described ball center swing center Q. By providing the balancer 16 at the front end portion of the lens barrel 11 with respect to the image sensor unit 19 provided at the rear end portion of the lens barrel 11, the center of gravity of the movable portion consisting of the lens barrel 11 and the movable unit 17 swings in the center of the ball. The weight is balanced so as to substantially coincide with the center Q.

  The image sensor unit 19 has an image sensor 19a (FIG. 9) whose light receiving surface is located on the optical axis O. A subject image obtained through the imaging optical system L is photoelectrically converted by the image sensor 19a, and the image signal is converted into an image signal. It is transmitted through the flexible substrate 19b. The flexible substrate 19b is connected to a control circuit 71 (conceptually shown in FIG. 9) that controls the imaging apparatus 10, and processes image signals in the control circuit 71 to display an image on a display device and image data on a recording medium. Record. Further, a signal from an attitude detection sensor 72 (FIG. 9) that detects the attitude of the imaging apparatus 10 is input to the control circuit 71.

  The coils 54, 55, 56 and the hall sensors 57, 58, 59 are assembled to the coil holder 13 at any stage before and after the movable unit 17 and the lens barrel 11 are attached to the coil holder 13. it can. As described above, the coil support plates 51, 52, 53 with the coils 54, 55, 56 attached are placed on the support recesses 48, 49, 50 of the coil holder 13 and fixed by bonding or the like. Coils 54, 55, 56 are inserted into the through holes 45, 46, 47. The inner peripheral surface 54d of the first coil 54 exposed through the through hole 45 and into the axial through portion 13b of the coil holder 13 is the permanent magnets 27-1 and 27-2 of the first magnet unit 27 constituting the movable unit 17. Is located opposite the outer peripheral surface 27b. Similarly, the inner peripheral surface 55d of the second coil 55 exposed in the axial through portion 13b of the coil holder 13 through the through hole 46 is the outer peripheral surface of each of the permanent magnets 28-1, 28-2 of the second magnet unit 28. The inner peripheral surface 56d of the third coil 56 that is located opposite to the b 28b and is exposed through the through hole 47 in the axial through portion 13b of the coil holder 13 is the permanent magnets 29-1, 29 of the third magnet unit 29. -2 is located opposite the outer peripheral surface 29b. The first coil 54 and the first magnet unit 27 that face in the radial direction constitute a first actuator (driving unit), and the second coil 55 and the second magnet unit 28 that face in the radial direction constitute a second actuator (drive). The third coil 56 and the third magnet unit 29 facing each other in the radial direction form a third actuator (drive unit).

  In the first actuator, the yoke 24 forms a magnetic circuit together with the first magnet unit 27, in the second actuator the yoke 25 forms a magnetic circuit together with the second magnet unit 28, and in the third actuator, the third magnet unit 29. At the same time, the yoke 26 forms a magnetic circuit. The yokes 24, 25, 26 are coils in which the bottom walls 24a, 25a, 26a and the standing walls 24b, 25b, 26b surround the magnet units 27, 28, 29, and the tips of the standing walls 24b, 25b, 26b are positioned in the outer diameter direction. By directing it toward 54, 55, 56, the magnetic lines of force of the magnet units 27, 28, 29 are concentrated on the coil 54, 55, 56 side (between the outer peripheral surfaces 27b, 28b, 29b and the tips of the standing walls 24b, 25b, 26b). Thus, the magnetic force acting on the coils 54, 55 and 56 is amplified. As described above, the yokes 24, 25, and 26 further have a function of holding the corresponding magnet units 27, 28, and 29.

  The hall sensors 57, 58, 59 are assembled in the sensor support recesses 51b, 52b, 53b of the coil support plates 51, 52, 53, so that the outer peripheral surfaces 27b, 28b, 29b of the magnet units 27, 28, 29 are obtained. In contrast, it is positioned with a slight gap in the radial direction (see FIGS. 9 and 34). Each Hall sensor 57, 58, 59 is substantially centered in the longitudinal direction and short direction of the corresponding coil 54, 55, 56 (when each coil 54, 55, 56 is viewed in plan along a straight line extending in the radial direction). (Refer to FIGS. 6 to 8, 29, and 31 to 34). A change in the magnetic field in the first actuator (first magnet unit 27) is detected by the hall sensor 57, a change in the magnetic field in the second actuator (second magnet unit 28) is detected by the hall sensor 58, and the hall sensor 59 A change in the magnetic field in the third actuator (third magnet unit 29) is detected. The sensor support recesses 51b, 52b, 53b are recessed using the internal space of the coil support protrusions 51a, 52a, 53a protruding in the inner diameter direction, so that the hall sensors 57, 58, 59 are arranged with excellent space efficiency. can do. In addition, the Hall sensors 57, 58, and 59 can be positioned close to the magnet units 27, 28, and 29 to improve detection accuracy.

  A flexible substrate (not shown) is disposed on the outer peripheral surfaces of the coil support plates 51, 52, and 53. The flexible substrate includes a sensor connection portion connected to the hall sensors 57, 58, and 59 in the sensor support recess portions 51b, 52b, and 53b, and the first coil 54, the second coil 55, and the third coil through the through holes 51c, 52c, and 53c. A coil connecting portion connected to each of 56 is provided. The flexible substrate is connected to the control circuit 71 (FIG. 9), and information on the magnetic field obtained by the Hall sensors 57, 58, 59 is sent to the control circuit 71 via the flexible substrate. Based on this sensor information, the movable unit 17 and The attitude of the lens barrel 11 is detected. Further, the control circuit 71 performs energization control to the first coil 54, the second coil 55, and the third coil 56. 9 shows only the connection relationship between the control circuit 71, the third coil 56, and the hall sensor 59, the same applies to the control circuit 71 and the first coil 54, the second coil 55, and the hall sensors 57, 58. Electrically connected.

  In the first actuator, the pair of long side portions 54a of the first coil 54 and the longitudinal directions of the permanent magnets 27-1, 27-2 of the first magnet unit 27 face the circumferential direction, and the long side portion on the front side. 54a and the permanent magnet 27-1 are opposed to each other in the radial direction, and the rear long side portion 54a and the permanent magnet 27-2 are opposed to each other in the radial direction. Since the permanent magnet 27-1 and the permanent magnet 27-2 are magnetized as shown in FIGS. 13 and 15 to 17, respectively, when the first coil 54 is energized, the first coil is obeyed according to Fleming's left-hand rule. Thrust in a direction substantially perpendicular to the direction in which current flows along the long side portion 54a of 54 and the direction of the magnetic field around the long side portion 54a by the permanent magnets 27-1 and 27-2 acts. The thrust by the first actuator is conceptually shown by arrows F11 and F12 in FIG. 6, FIG. 18, FIG. 21, and FIG. The direction of the thrust is switched between F11 and F12 depending on the direction of the current of the first coil 54. In the first actuator, the longitudinal direction of the first magnet unit 27 and the long side portion 54a of the first coil 54 extend in the circumferential direction. As a result, the thrusts F11 and F12 can be generated efficiently.

  In the second actuator, the pair of long side portions 55a of the second coil 55 and the respective longitudinal directions of the permanent magnets 28-1, 28-2 of the second magnet unit 28 face the circumferential direction, and the long side portion on the front side. 55a and the permanent magnet 28-1 are opposed to each other in the radial direction, and the rear long side portion 55a and the permanent magnet 28-2 are opposed to each other in the radial direction. Since the permanent magnet 28-1 and the permanent magnet 28-2 are magnetized as shown in FIGS. 13, 15 to 17, respectively, when the second coil 55 is energized, the second coil 55 is subjected to Fleming's left-hand rule. A thrust in a direction substantially perpendicular to the direction in which the current flows along the long side portion 55a of 55 and the direction of the magnetic field around the long side portion 55a by the permanent magnets 28-1, 28-2 acts. The thrust by the second actuator is conceptually shown by arrows F21 and F22 in FIGS. 6, 8, 18, and 20. FIG. The direction in which the thrust acts is switched between F21 and F22 depending on the direction of the current in the second coil 55. In the second actuator, the longitudinal direction of the second magnet unit 28 and the long side portion 55a of the second coil 55 respectively extend in the circumferential direction. As a result, the thrusts F21 and F22 can be generated efficiently.

  In the third actuator, the pair of long sides 56a of the third coil 56 and the respective permanent magnets 29-1, 29-2 of the third magnet unit 29 extend in the optical axis direction, and one of the long sides The portion 56a and the permanent magnet 29-1 are opposed to each other in the radial direction, and the other long side portion 56a and the permanent magnet 29-2 are opposed to each other in the radial direction. Since the permanent magnet 29-1 and the permanent magnet 29-2 are magnetized as shown in FIGS. 13, 15 to 17, respectively, when the third coil 56 is energized, the third coil 56 is obeyed according to Fleming's left-hand rule. A thrust in a direction substantially perpendicular to the direction in which current flows along the long side portion 56a of 56 and the direction of the magnetic field around the long side portion 56a by the permanent magnets 29-1, 29-2 is applied. The thrust by the third actuator is conceptually shown by arrows F31 and F32 in FIGS. 7, 8, 19, 20, and 33. FIG. The direction in which the thrust acts is switched between F31 and F32 depending on the direction of the current in the third coil 56. Unlike the first and second actuators, in the third actuator, the longitudinal direction of the third magnet unit 29 and the direction in which the long side portion 56a of the third coil 56 extends are not in the circumferential direction but in the optical axis direction. Yes. Thereby, thrusts F31 and F32 in the rolling direction can be generated efficiently.

  Since each coil 54, 55, 56 is fixedly supported by the coil holder 13, the thrust of each actuator acts as a force for operating the movable unit 17 having each magnet unit 27, 28, 29. As described above, the movable unit 17 is supported so as to be rotatable about the center of swinging of the spherical center Q, and the movable unit 17 and the mirror are mirrored by the thrusts F11, F12, F21, and F22 of the first actuator and the second actuator. The cylinder 11 performs a tilting operation in which the optical axis O is tilted about the ball center swing center Q. For example, the virtual plane P1 (FIG. 3) including the optical axis O before the tilt passing through the intermediate circumferential position between the first actuator and the second actuator and the optical axis O before the tilt perpendicular to the virtual plane P1 is included. The virtual plane P2 (FIG. 3) is set, and the tilting of the movable unit 17 and the lens barrel 11 along the virtual plane P1 is performed in the pitching direction. Then, the movable unit 17 and the lens barrel 11 are tilted in all directions including the components in the pitching direction and the components in the yawing direction by the thrusts F11, F12, F21, and F22 of the first actuator and the second actuator. be able to.

  Further, the movable unit 17 and the lens barrel 11 rotate in the rolling direction around the optical axis O (change in the angle in the circumferential direction) by the thrusts F31 and F32 of the third actuator. When the movable unit 17 and the lens barrel 11 are tilted from the initial state by driving the first and second actuators, the tilted optical axis is centered on the thrust F31, F32 of the third actuator V3. Rotation is performed by the thrust component in the rotation direction.

  When the tilting operation of the movable unit 17 including components in the pitching direction and yawing direction reaches a predetermined amount, any of the six tilt limiting protrusions 30A, 30B, 30C, 30D, 30E, and 30F provided on the barrel holder 12 is Abutting on the tilt regulating surface 68 of the holder 14, further tilting of the movable unit 17 is mechanically limited. The six tilt limiting projections 30A, 30B, 30C, 30D, 30E, and 30F have substantially the same radial distance from the optical axis O, the same position in the optical axis direction, and two adjacent tilt limiting projections 30. All the circumferential intervals are substantially the same. In other words, the centers of the tilt limiting protrusions 30A, 30B, 30C, 30D, 30E, and 30F adjacent in the circumferential direction are connected in a straight line in order in the state viewed along the optical axis O as shown in FIGS. Then it becomes a regular hexagon. By arranging in this way, the amount of tilting operation of the movable unit 17 can be limited almost uniformly without being biased in a specific direction. In particular, when the movable unit 17 tilts along a plane that is equidistant from two adjacent tilt limiting projections 30 among the plane including the optical axis O, the two tilt limiting projections 30 are both tilt limiting surfaces. 68 abuts. For example, when the movable unit 17 tilts along the plane including the optical axis O through the center of the first coil 54 in the circumferential direction, the pair of tilt limiting protrusions 30A and 30F or the pair of tilt limiting protrusions 30C and 30D is tilt controlled. Abuts on surface 68. When the movable unit 17 tilts along the plane including the optical axis O and passes through the center of the second coil 55 in the circumferential direction, the pair of tilt limiting protrusions 30B and 30C or the pair of tilt limiting protrusions 30E and 30F is tilted restricting surface. 68 abuts. When the movable unit 17 tilts along the plane including the optical axis O (virtual plane P1) passing through the center of the third coil 56 in the circumferential direction, the pair of tilt limiting protrusions 30A and 30B or the pair of tilt limiting protrusions 30D and 30E. Comes into contact with the tilt regulating surface 68. In these states in which the two tilt limiting protrusions 30 are in contact with the tilt restricting surface 68, higher stability and accuracy of the movable unit 17 can be obtained than in the state in which one tilt restricting protrusion 30 is in contact with the tilt restricting surface 68. When the image pickup apparatus 10 is started up or when the image stabilization function is switched from the invalid state to the valid state, the Hall movement sensors 57, 58, and 59 relating to the tilt operation are referred to with reference to the mechanical movement end of the tilt as a reference position. (In particular, initialization of detection by the hall sensors 57 and 58) is performed. In particular, when the movable unit 17 tilts along the plane including the optical axis O through the center of the first coil 54 in the circumferential direction (the pair of tilt limiting protrusions 30A and 30F or the pair of tilt limiting protrusions 30C and 30D is tilt controlled). And the case where the movable unit 17 tilts along the plane including the optical axis O through the center of the second coil 55 in the circumferential direction (a pair of tilt limiting protrusions 30B and 30C or a tilt limiting protrusion 30E). , 30F abuts against the tilt regulating surface 68), since the amount of change in magnetic flux density detected by the Hall sensors 57, 58 is large, it is effective to perform initialization in the tilt directions along these two planes. .

  By making the protrusion amounts in the optical axis direction of the six tilt limiting protrusions 30A, 30B, 30C, 30D, 30E, and 30F equal, there is an advantage that the movement amount calculation and component management at the time of initialization can be facilitated. However, it is possible to make the amount of protrusion of each tilt limiting protrusion 30 different.

  When the movable unit 17 rotates in the rolling direction, one and the other of the pair of roll range restricting protrusions 31 provided on the swing guide surface 20A of the barrel holder 12 correspond to the one and the other of the support seat 40A. The operating range is limited by contacting the side surface. As shown in FIG. 5, the circumferential interval between the pair of roll range limiting projections 31 is larger than the circumferential width of the support seat 40A, and the circumferential gap between each roll range limiting projection 31 and the support seat 40A is rolling. The movable unit 17 (barrel holder 12) moves in the direction. When the image pickup apparatus 10 is started up or when the anti-vibration function is switched from the invalid state to the valid state, the roll operation is performed with reference to the mechanical moving end where each roll range limiting protrusion 31 contacts the support seat 40A as a reference position. The detection by the hall sensors 57, 58 and 59 (particularly the hall sensor 59) is initialized.

  As described above, the first to third actuators are used to move the movable unit 17 and the lens barrel 11 in any direction including the pitching, yawing, and rolling motion components (centered on the pivot center Q). Rotation). By this operation, the direction of the optical axis O (the inclination of the light receiving surface of the image sensor 19a) and the rotation direction position of the image sensor 19a around the optical axis O can be changed. For example, when vibration due to camera shake or the like is applied to the image pickup apparatus 10, the movable unit 17 and the lens barrel 11 are operated in a direction and size to reduce the image shake on the image sensor 19a due to the posture change. It is possible to perform image stabilization (image blur correction) control that reduces image quality degradation. In the image stabilization control, the control circuit 71 controls each coil based on the posture information of the imaging device 10 by the posture detection sensor 72 (FIG. 9) and the positional information of the movable unit 17 and the lens barrel 11 by the hall sensors 57, 58, and 59. It is executed by controlling the energization of 54, 55 and 56. In particular, in the imaging apparatus 10 according to the present embodiment, the optical system is arranged along a plane perpendicular to the optical axis O by supporting the imaging cylinder L that supports the imaging optical system L and the image sensor unit 19 in a freely rotatable manner. Compared to the type of imaging device to be operated, it is possible to increase the image blur correction angle that can be accommodated with a compact configuration. For this reason, not only a camera that is supposed to be photographed by hand, but also a wearable camera that can be attached to any position of the body, or a camera that is mounted on a mobile machine such as an automobile, conditions that cause large image blurring. Even in the imaging apparatus, an excellent anti-shake correction effect can be obtained.

  Further, since the center of gravity of the movable part including the movable unit 17 and the lens barrel 11 and the ball center swing center Q substantially coincide with each other, the load variation when driving the movable unit 17 and the lens barrel 11 is small, and the first is small and light. The operations of the movable unit 17 and the lens barrel 11 can be controlled with high response and high accuracy by the second and third actuators.

  The above imaging device 10 can support the magnet units 27, 28, and 29 constituting each actuator in a space-saving manner, and has a configuration excellent in workability at the time of assembly. First, the magnet units 27, 28, 29 are held by the bottom walls 24a, 25a, 26a of the yokes 24, 25, 26 supported on the support seats 21, 22, 23 of the barrel holder 12 and a pair of standing walls 24b, 25b, 26b. In addition, since the barrel holder 12 does not require a wall portion that surrounds the outer sides of the magnet units 27, 28, 29 and the yokes 24, 25, 26, a space around the magnet units 27, 28, 29 is provided. Efficiency can be increased. For example, in the radial space between the barrel holder 12 and the coil holder 13, a circumferential space can be obtained between each magnet unit 27, 28, 29 and each yoke 24, 25, 26, and this circumferential space. Can be utilized as an arrangement space for the three support seats 40A, 40B, and 40C (means for movably supporting the movable unit 17 by the fixed unit 18). Moreover, since the space beyond the thickness of each magnet unit 27, 28, 29 and each yoke 24, 25, 26 is not required also in the optical axis direction, the size of the movable unit 17 in the optical axis direction can be reduced.

  The yokes 24, 25, and 26 can be easily positioned by inserting the magnet support protrusions 21b, 22b, and 23b protruding from the support seats 21, 22, and 23 into the long holes 24c, 25c, and 26c. The magnet support protrusions 21b, 22b, and 23b are formed of a pair of permanent magnets 27-1, 27-2, a pair of permanent magnets 28-1, 28-2, and a permanent magnet 29-1 constituting each magnet unit 27, 28, 29. , 29-2 also functions as a spacer for providing a gap between the pair, and the possibility that the permanent magnets forming the pair inadvertently adsorb in the production process can be reduced. In particular, a strong magnet is often used in an actuator for anti-vibration driving, so this configuration is effective. Each permanent magnet has a shape that fits in the space within the yokes 24, 25, and 26 separated by the magnet support protrusions 21b, 22b, and 23b without waste. It doesn't take. Further, since the magnet units 27, 28, and 29 are attracted to the yokes 24, 25, and 26 by the magnetic force when they are accommodated in the corresponding yokes 24, 25, and 26, the temporary assembly before being finally fixed by bonding is used. A stable holding state can be obtained even at the stage.

  The magnet support protrusions 21b, 22b, and 23b are made shorter than the longitudinal size of each of the magnet units 27, 28, and 29 so that the pair of permanent magnets 27-1 and 27-2 and the permanent magnets 28-1 and 28-2 Adhesive injection spaces M1, M2, and M3 are formed between the pair of permanent magnets 29-1 and 29-2. Therefore, the space for injecting the adhesive is not required outside the magnet units 27, 28, 29, and the magnet units 27, 28, 29 and the yokes 24, 25, 26 are connected without increasing the size of the actuator. It can be bonded and fixed. Since the magnet units 27, 28, 29 and the yokes 24, 25, 26 can be simultaneously fixed to the barrel holder 12 by injecting the adhesive into the adhesive injection spaces M1, M2, M3, the number of work steps can be reduced. In addition, since the yokes 24 and 25 have the circumferential ends of the adhesive injection spaces M1 and M2 closed by the pair of standing walls 24b and 25b, leakage of the adhesive from the adhesive injection spaces M1 and M2 occurs. Contributes to improved workability during bonding.

  The standing walls 24b, 25b, and 26b of the yokes 24, 25, and 26 can be formed by bending a metal plate, and the long holes 24c, 25c, and 26c can be formed by punching the metal plate. When the material of the barrel holder 12 is a synthetic resin, the magnet support protrusions 21b, 22b, and 23b can be formed by a molding die that moves in the optical axis direction. Any of these manufacturing methods is inexpensive and hassle-free, and the above-described effects can be obtained while suppressing the production cost of the imaging device 10.

  35 to 42 show the movable unit 117 and its components according to the second embodiment. The movable unit 117 has the same configuration as that of the movable unit 17 of the first embodiment described above with respect to the barrel holder 12 and the first magnet unit 27, and these common elements are denoted by the same reference numerals. The components other than the movable unit 117 are the same as those in the first embodiment, and are not shown.

  The yoke 124 in the movable unit 117 has a curved bottom wall (bottom part) 124a placed on the support seat 21 of the barrel holder 12, and a long hole (hole part) through which the magnet support protrusion 21b is inserted into the bottom wall 124a. ) 124c is formed in common with the yoke 24 of the previous embodiment, but it is not in the circumferential direction of the bottom wall 124a but from the front and rear edges in the optical axis direction of the bottom wall 124a. The difference is that it has a pair of standing walls (standing wall portions) 124b projecting toward each other. The standing wall 124b at the front in the optical axis direction faces the side surface 27d facing the front of the permanent magnet 27-1, and the standing wall 124b at the rear in the direction of the optical axis faces the side surface 27e facing the rear of the permanent magnet 27-2. The standing wall 124b is configured to hold the permanent magnet 27-1 and the permanent magnet 27-2 from both sides in the optical axis direction. The distance between the pair of standing walls 124b in the optical axis direction is substantially equal to the sum of the widths of the permanent magnet 27-1, the magnet support protrusion 21b, and the permanent magnet 27-2 in the optical axis direction. The permanent magnet 27-1 and the permanent magnet 27-2 are accommodated in the two spaces between the protrusions 21b without rattling. The circumferential length of the pair of standing walls 124b is slightly larger than the circumferential length of the permanent magnets 27-1, 27-2, and can cover the entire longitudinal direction of the first magnet unit 27.

  The pair of standing walls 124b in the yoke 124 protrudes toward the coil 54 (see the first embodiment shown in FIGS. 1 to 34) disposed in the outer diameter direction of the first magnet unit 27, and the first Similar to the yoke 24 of the embodiment, the magnetic force acting on the coil 54 can be strengthened by concentrating the magnetic lines of force between the outer peripheral surface 27b of the permanent magnet 27-1 and the permanent magnet 27-2 and the tip of the standing wall 124b.

  In FIGS. 35 to 42, the second magnet unit 28 and the third magnet unit 29 in the first embodiment are not shown, but the yoke that holds these magnet units is also a standing wall in the same manner as the yoke 124. It is possible to change the protruding position. That is, the yoke 25 and the yoke 26 of the first embodiment include a pair of standing walls 25b and 26b that protrude in the outer diameter direction from both ends in the circumferential direction of the bottom walls 25a and 26a. A pair of standing walls protruding in the outer diameter direction from the front and rear edges of the bottom walls 25a and 26a in the optical axis direction can be provided.

  43 to 49 show a movable unit 217 and its constituent elements according to the third embodiment. The movable unit 217 is different from the movable unit 17 of the first embodiment and the movable unit 117 of the second embodiment in that the magnet unit 227 and the yoke 224 are flat without being curved. Different.

  The permanent magnet 227-1 and the permanent magnet 227-2 constituting the magnet unit 227 have a substantially common rectangular parallelepiped shape, and each of the permanent magnets 227-1 and 227-2 has a bottom surface 227 a and a coil facing surface 227 b extending in the longitudinal direction. And a pair of longitudinal end surfaces 227c, and a side surface 227d and a side surface 227e extending in the longitudinal direction substantially perpendicular to the bottom surface 227a and the coil facing surface 227b.

  The yoke 224 protrudes substantially perpendicularly to the bottom wall 224a from a rectangular bottom wall (bottom) 224a that supports the bottom surface 227a of each permanent magnet 227-1, 227-2, and a longitudinal end of the bottom wall 224a. And a long hole (hole portion) 224c formed in the longitudinal direction at the approximate center in the short side direction of the bottom wall 224a.

  The movable member 212 is a member corresponding to the barrel holder 12 in the first and second embodiments, and only the support seat 221 corresponding to the support seat 21 of the barrel holder 12 is shown in the drawing. The support seat 221 has a flat support surface (support portion) 221a that supports the bottom wall 224a of the yoke 224, and a thin plate-like magnet support protrusion (projection portion) 221b that protrudes substantially perpendicular to the support surface 221a. doing. The length of the magnet support protrusion 221b in the plane along the support surface 221a is shorter than the lengths of the permanent magnet 227-1 and the permanent magnet 222-2 in the longitudinal direction.

  The yoke 224 is supported on the support seat 221 by inserting the magnet support protrusion 221b through the long hole 224c and placing the bottom wall 224a on the support surface 221a. The permanent magnet 227-1 is mounted on the yoke 224 with the side surface 227e facing the magnet support projection 221b, and the permanent magnet 227-2 is mounted on the yoke 224 with the side surface 227d facing the magnet support projection 221b. Each permanent magnet 227-1, 227-2 is supported in a state where the bottom surface 227 a is placed on the bottom wall 224 a of the yoke 224 and the pair of longitudinal end surfaces 227 c are sandwiched between the pair of standing walls 224 b of the yoke 224. Is done. Then, an adhesive is injected into an adhesive injection space (gap) M4 (FIGS. 43 and 47) formed between the side surface 227e of the permanent magnet 227-1 and the side surface 227d of the permanent magnet 222-2, and the support seat The yoke 224 and the magnet unit 227 are fixed to the 221.

  Although not shown in FIGS. 43 to 49, a coil is provided at a position facing the coil facing surface 227 b of the magnet unit 227. The coil is a flat air core coil having a pair of side portions extending along the longitudinal direction of the permanent magnets 227-1 and 227-2 and a pair of connecting portions connecting the pair of side portions. Then, thrusts F41 and F42 indicated by arrows in FIGS. 47 and 49 are generated according to the direction of the current.

  Similar to the movable units 17 and 117 in the first and second embodiments, the movable unit 217 includes a tilting operation (tilting along a plane including the optical axis O) in which the movable member 212 includes components in the pitching direction and the yawing direction. A rolling operation (rotation around the optical axis O) can be performed. In this case, an actuator including the magnet unit 227 and the yoke 224 may be arranged so that the thrusts F41 and F42 are directed in the tangential direction of the arc centered on the ball center swing center Q (FIGS. 9 and 22). Further, by adding two or more similar actuators separately from this actuator and arranging them so that the direction of the action of each thrust is different, the vibration isolating operation equivalent to that of the first embodiment can be realized.

  Unlike the first embodiment, the movable unit 217 can be configured to move the movable member 212 in a planar manner. Specifically, the movable member 212 can be operated linearly in the direction in which the thrusts F41 and F42 act by supporting the movable member 212 movably along a plane including the support surface 221a of the support seat 221. The movable member 212 can be moved in any direction along the plane including the support surface 221a by adding at least one actuator having a similar configuration that generates thrust in a direction intersecting the thrusts F41 and F42. In this case, by arranging the support surface 221a (moving plane of the movable member 212) to be perpendicular to the optical axis of the optical system, the optical element held by the movable member 212 moves along the plane orthogonal to the optical axis. It is established as a type of anti-vibration mechanism.

  Similar to the yoke 124 of the second embodiment, the yoke 224 may be changed to a configuration in which the pair of standing walls 224b protrude from the ends in the short direction instead of the ends in the longitudinal direction of the bottom wall 224a. Is possible. In this case, the pair of standing walls 224b sandwich the side surface 227d of the permanent magnet 227-1 and the side surface 227e of the permanent magnet 227-2.

  As can be seen from the third embodiment, the magnet and the yoke in the present invention are not limited to a curved shape around the optical axis O of the imaging optical system, and depend on the image stabilization drive mode and the internal structure of the imaging device. Thus, the shape of the magnet or yoke can be changed as appropriate.

  In each of the above embodiments, each yoke is provided with a pair of standing walls. However, it is also possible to provide three or more standing walls surrounding the magnet unit in each yoke. For example, as a modification of the yoke 24 of the first embodiment, in addition to a pair of standing walls 24b facing the longitudinal end surface 27c of the first magnet unit 27, a standing wall (first wall) facing the side surface 27d of the permanent magnet 27-1. In the yoke 124 of the second embodiment in the same direction as the standing wall 124b on the front side in the optical axis direction) or a standing wall facing the side surface 27e of the permanent magnet 27-2 (the standing wall on the rear side in the optical axis direction in the yoke 124 of the second embodiment). The same part as 124b can be provided. Thus, by increasing the surrounding range of the magnet unit by the standing wall of the yoke, an effect of reducing magnetic flux leakage to the outside of the yoke can be obtained. In addition, when increasing the standing wall of the yoke as compared with the illustrated embodiment, it is advantageous in terms of detection accuracy by the Hall sensor to form the standing wall so as to surround all four sides of the magnet unit.

  As mentioned above, although this invention was demonstrated based on illustration embodiment, this invention can be made into a different form from illustration embodiment in the range of a summary. For example, the imaging apparatus 10 of the first embodiment includes three actuators, but the third actuator including the third magnet unit 29, the yoke 26, and the third coil 56 is omitted, and the optical axis O is the center. The present invention can also be applied to an imaging device that is a type of vibration isolation mechanism that does not perform an operation in the rolling direction. In the imaging device 10 of the first embodiment, the first actuator including the first magnet unit 27, the yoke 24, and the first coil 54, and the second actuator including the second magnet unit 28, the yoke 25, and the second coil 55. Although the movable unit 17 and the lens barrel 11 are tilted by the two actuators, it is possible to use three or more actuators for the tilting operation.

  In each illustrated embodiment, a magnet and a yoke are supported on a movable member (barrel holder 12 and movable member 212) that moves during a vibration isolating operation, and a coil is supported on a fixed member (coil holder 13) that does not move during the vibration isolating operation. This is applied to a so-called moving magnet type vibration isolation mechanism. The moving magnet type has an advantage that the coils 54, 55, and 56 and the hall sensors 57, 58, and 59 that need to be electrically connected by a flexible substrate or the like do not move, so that a load by such an electrical connecting means is not applied. However, the present invention can also be applied to a moving coil type vibration isolation mechanism. When the moving coil type modification is applied to the imaging apparatus 10 of the first embodiment, each coil 54, 55, 56 supported by the barrel holder 12 is supported by the coil holder 13 so as to be opposed to the outer diameter direction. The magnet units 27, 28, and 29 are positioned, the magnet support protrusions 21b, 22b, and 23b protrude from the coil holder 13 toward the inner diameter direction, and the yokes 24, 25, and 26 face the standing walls 24b, 25b, and 26b in the inner diameter direction. And is supported by the coil holder 13. Hall sensors 57, 58, 59 are supported by barrel holder 12.

  In the image pickup apparatus 10 of the first embodiment, the entire image pickup unit including the image pickup optical system L and the image sensor unit 19 performs a tilt operation and a rolling operation. Group) or an image sensor that performs image blur correction by operating only the image sensor 19a.

DESCRIPTION OF SYMBOLS 10 Imaging device 11 Lens tube 11a Large diameter part 11b Middle part 11c Small diameter part 11d Peripheral screw 12 Barrel holder (movable member)
12a Tube portion 12b Axial through portion 12c Insertion restriction flange 13 Coil holder (fixing member)
13a Tube portion 13b Axial through portion 13c Front wall 13d Center opening 14 Ball holder 14a Center opening 14b Cover portion 14c Outer flange 15 Presser ring 16 Balancer 17 Movable unit 18 Fixed unit 19 Image sensor unit
19a Image sensor 19b Flexible substrate 20 (20A 20B 20C) Swing guide surface (supporting means)
21 22 23 Support seat 21a 22a 23a Support surface (support part)
21b 22b 23b Magnet support protrusion (protrusion)
24 25 26 Yoke 24a 25a 26a Bottom wall (bottom)
24b 25b 26b Standing wall (standing wall part)
24c 25c 26c Slotted hole (hole)
27 First magnet unit 28 Second magnet unit 29 Third magnet unit 27-1 28-1 29-1 Permanent magnet 27-2 28-2 29-2 Permanent magnet 27a 28a 29a Inner peripheral surface 27b 28b 29b Outer peripheral surface 27c 28c 29c Longitudinal end face 27d 27e 28d 28e 29d 29e Side face 30 (30A 30B 30C 30D 30E 30F) Tilt restriction protrusion 31 Roll range restriction protrusion 40 (40A 40B 40C) Support seat (support means)
41 Ball holding groove 41a Front regulating wall 42 Screw hole 43 Abutting surface 45 46 47 Through hole 48 49 50 Support recess 51 52 53 Coil support plate 51a 52a 53a Coil support projection 51b 52b 53b Sensor support recess 51c 52c 53c Through hole 54 1 coil 55 2nd coil 56 3rd coil 54a 55a 56a Long side part 54b 55b 56b Short side part 54c 55c 56c Outer peripheral surface 54d 55d 56d Inner peripheral surface 57 58 59 Hall sensor 61 Fixed position ball (support means)
62 Biasing ball (support means)
65 (65A, 65B, 65C) Forward projecting portion 66 Screw insertion hole 66a Large diameter portion 66b Small diameter portion 66c Intermediate portion 67 Ball holding surface 68 Tilt restricting surface 69 Fixed screw 69a Screwing portion 69b Head portion 69c Shaft portion 70 Coil spring 71 Control Circuit 72 Attitude detection sensor 117 Movable unit 124 Yoke 124a Bottom wall (bottom)
124b Standing wall (standing wall)
124c oblong hole (hole)
217 Movable unit 212 Movable member 221 Support seat 221a Support surface (support part)
221b Magnet support protrusion (protrusion)
224 Yoke 224a Bottom wall (bottom)
224b Standing wall (standing wall)
224c oblong hole (hole)
227 Magnet unit 227-1 227-2 Permanent magnet 227 a Bottom surface 227 b Coil facing surface 227 c Longitudinal end surface 227 d 227 e Side surface L Imaging optical system (imaging means)
M1 M2 M3 M4 Adhesive injection space (gap)
O Optical axis Q Ball center swing center

Claims (11)

A movable member that supports at least part of the imaging means for obtaining a subject image;
A fixed member that movably supports the movable member;
A magnet and a yoke supported by one of the movable member and the fixed member to form a magnetic circuit; and a coil supported by the other of the movable member and the fixed member. A drive unit that applies image thrust to correct image blur;
In an imaging apparatus comprising:
The one movable member or the fixed member that supports the magnet and the yoke includes a support portion that supports the yoke, and a protruding portion that protrudes from the support portion,
The yoke includes a bottom portion supported by the support portion, a hole portion that is formed in the bottom portion and passes through the protruding portion to determine the position of the yoke, and a plurality of protrusions that protrude from the bottom portion toward the coil side. With a standing wall,
The drive unit includes at least two magnets, and the two magnets are supported on the bottom portion of the yoke while being spaced apart from each other with the protruding portion interposed therebetween, and are held to face the plurality of standing wall portions. An imaging apparatus characterized by that. 2. The imaging apparatus according to claim 1, wherein each of the two magnets has an elongated shape, and is supported by the yoke in a parallel arrangement in which the protrusions are sandwiched in the short direction with the longitudinal directions thereof being substantially parallel to each other. apparatus. The imaging apparatus according to claim 2, wherein the protruding portion is shorter than the magnets in the longitudinal direction of the two magnets, and there is a gap between the two magnets except in a region sandwiching the protruding portion. The imaging apparatus according to claim 3, further comprising an adhesive fixing portion that fixes each of the magnets to the protruding portion and the yoke with an adhesive in the gap. 5. The imaging apparatus according to claim 2, wherein the yoke includes a pair of standing wall portions facing both end faces in the longitudinal direction of the two magnets. 6. 5. The imaging device according to claim 2, wherein the yoke is a pair of standing walls facing two side surfaces opposite to a side surface facing the projecting portion of the two magnets. 6. An imaging device comprising a unit. The imaging device according to any one of claims 1 to 6,
The bottom portion of the yoke has a curved shape along a cylindrical surface centering on the optical axis of the optical system constituting the imaging means, and the standing wall portion of the yoke is centered on the optical axis with respect to the bottom portion. Projecting in the radial direction and
The imaging device in which each of the two magnets has a curved shape along the bottom of the yoke. 8. The imaging device according to claim 7, wherein the three driving units are provided at different positions in a circumferential direction around the optical axis, and the first driving unit and the second driving unit are movable. Imaging in which thrust in two different directions for changing the inclination of the optical axis is applied to the member, and the third driving unit applies thrust in the rotational direction about the optical axis to the movable member. apparatus. The imaging device according to claim 8, wherein bottoms of the three yokes constituting the three driving units are located on the same cylindrical surface with the optical axis as a center. 10. The imaging apparatus according to claim 8, further comprising a supporting unit that movably supports the movable member with respect to the fixed member at a circumferential position between the three driving units. 11. The imaging apparatus according to claim 1, wherein the magnet and the yoke are supported by the movable member, and the coil is supported by the fixed member.

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