JP6157239B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a lens barrel provided with an image blur correction device and an imaging device provided with the lens barrel.

  An image blur correction device mounted on a lens barrel of a digital camera or the like drives a movable lens holding a correction lens or an image sensor as an image blur correction optical system in two directions in a plane substantially orthogonal to the optical axis. This reduces the effects of camera shake that occurs during shooting.

  As a conventional image blur correction apparatus of this type, a first movable member that holds a first correction lens and a second correction lens that hold a first correction lens in front and rear in the optical axis direction with a fixed member interposed therebetween, respectively. The thing which arrange | positioned 2 movable members is proposed (patent document 1). In this proposal, the correctable angle of the image blur correction device can be increased by driving the first movable member and the second movable member independently in two directions in a plane substantially orthogonal to the optical axis. Yes.

JP 2009-258389 A

  By the way, in the image blur correction apparatus of Patent Document 1, when the distance between the lens groups constituting the photographing optical system is changed by zooming, focusing, or the like, the optical axis direction of the first and second movable members is accordingly changed. It is conceivable to improve the optical performance by changing the distance.

  However, in Patent Document 1, the first movable member and the second movable member are supported so as to be movable in a plane substantially perpendicular to the optical axis with respect to the common fixed member. The distance in the optical axis direction between the member and the second movable member is constant. For this reason, it is difficult to improve the optical performance of image blur correction when the distance between the lens groups changes due to zooming, focusing, or the like.

  On the other hand, when the optical performance is improved by changing the distance between the first and second movable members in the optical axis direction, each electromagnetic drive that drives the first and second movable members in directions substantially orthogonal to the optical axis, respectively. Since the portions are arranged so as to overlap in the optical axis direction, a magnetic interaction force is generated between the electromagnetic drive portions. When the distance in the optical axis direction of the first and second movable members changes, the influence of the magnetic interaction force on each electromagnetic drive unit also changes, so the optical axes of the first and second movable members There is a problem that highly accurate position control in a substantially orthogonal direction becomes difficult.

  Therefore, the present invention aims to improve the optical performance of image blur correction when the distance between the lens groups changes due to zooming, focusing, etc., and in the direction intersecting the optical axes of the first and second movable members. An object is to provide a mechanism for realizing high-precision position control.

  In order to achieve the above object, the lens barrel of the present invention has a first movable member that holds the first image blur correction optical system, and the first movable member is movable in a direction intersecting the optical axis. A first fixed member to be supported, a first electromagnetic drive unit that drives the first movable member in a first direction intersecting the optical axis, and a second direction that intersects the first movable member with the optical axis A first image blur correction apparatus having a second electromagnetic drive unit that is driven in a second direction, a second movable member that holds a second image blur correction optical system, and a direction in which the second movable member intersects the optical axis A second fixed member that is movably supported, a third electromagnetic drive unit that drives the second movable member in a third direction that intersects the optical axis, and a second movable member that intersects the optical axis. A second image blur correction device having a fourth electromagnetic drive unit that drives in a fourth direction, and the first image blur compensation device. The apparatus is movable relative to the second image blur correction apparatus in the optical axis direction, and an area divided into four equal parts every 90 ° in the circumferential direction with the optical axis as a center is respectively the first area and the first area. When the second region, the third region, and the fourth region, the first electromagnetic driving unit is disposed in the first region, the second electromagnetic driving unit is disposed in the second region, The third electromagnetic drive unit is disposed in the third region, and the fourth electromagnetic drive unit is disposed in the fourth region.

  According to the present invention, it is possible to improve the optical performance of image blur correction when the distance between the lens groups is changed by zooming, focusing, or the like, and intersect the optical axes of the first and second movable members. High-precision position control in the direction can be realized.

1 is an exploded perspective view of a lens barrel including an image blur correction device that is an example of an embodiment of the present invention. FIG. 2 is a cross-sectional view along the optical axis direction at a tele position in the lens barrel assembly shown in FIG. 1. FIG. 2 is a cross-sectional view along the optical axis direction at a wide position in the lens barrel assembly shown in FIG. 1. It is a disassembled perspective view of a 2nd group lens-barrel. It is sectional drawing in alignment with the optical axis direction of a 2nd group barrel. It is the perspective view which decomposed | disassembled some 2nd group barrels and the 3rd group barrels. It is the figure which looked at the movable member of the 2nd group barrel, and the movable member of the 3rd group barrel from the optical axis direction. The distance between the electromagnetic drive unit of the second group barrel and the electromagnetic drive unit of the third group barrel and the magnetism that the electromagnetic drive unit of the second group barrel gives to the electromagnetic drive unit of the third group barrel in the present invention example and the comparative example It is a graph which shows the relationship with the amount of interference. It is a block diagram of the control circuit which controls the drive of the electromagnetic drive part of a 2nd group lens barrel. It is a graph which shows the relationship between the output voltage of a position sensor, and the displacement amount of the direction substantially orthogonal to the optical axis of a movable member.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a lens barrel provided with an image blur correction device as an example of an embodiment of the present invention. FIG. 2 is a cross-sectional view along the optical axis direction at the tele position in the lens barrel assembly shown in FIG. FIG. 3 is a cross-sectional view taken along the optical axis direction at the wide position in the lens barrel assembly shown in FIG. In the present embodiment, a lens barrel mounted on an imaging apparatus such as a digital camera is taken as an example.

  As shown in FIGS. 1 to 3, the lens barrel 100 of the present embodiment includes an element holder 102, a fixed barrel 103, a cam barrel 104, a first group barrel 110, a second group barrel 120, a third group barrel 130, And a fourth group barrel 140. The lens barrel 100 is a zoom type in which the photographing optical system moves in the optical axis direction between the photographing position and the storage position to change the photographing magnification.

  The element holder 102 holds an image sensor 101 such as a CCD sensor or a CMOS sensor. Further, a main bar 143, a sub bar 144, and a stepping motor 145, which will be described later, of the fourth group barrel 140 are fixed to the element holder 102.

  In the fixed cylinder 103, the element holder 102 is fixed to the end on the image plane side, and a first group lens holder 112 (to be described later) of the first group lens barrel 110 is held on the inner periphery of the end on the subject side. In addition, on the peripheral wall of the fixed cylinder 103, there are formed three first rectilinear grooves 1031 and second rectilinear grooves 1032 extending in the optical axis direction at substantially equal intervals in the circumferential direction.

  A follower 1231 provided on a fixed ground plate 123 (described later) of the second group lens barrel 120 is engaged with the first rectilinear groove 1031, whereby the second group lens barrel 120 moves in the optical axis direction with respect to the fixed cylinder 103. Supported as possible. Further, a follower 1331 provided on a fixed ground plate 133 (to be described later) of the third group barrel 130 is engaged with the second rectilinear groove 1032, so that the third group barrel 130 is aligned with the fixed barrel 103 in the optical axis direction. Is supported so as to be movable.

  The cam cylinder 104 is rotatably supported on the outer peripheral portion of the fixed cylinder 103. On the peripheral wall of the cam cylinder 104, three first cam grooves 1041 and two second cam grooves 1042 are formed at substantially equal intervals in the circumferential direction.

  A follower 1231 provided on a fixed ground plate 123 (to be described later) of the second group barrel 120 follows the first cam groove 1041, whereby the second group barrel 120 is moved in the optical axis direction according to the rotation of the cam barrel 104. Move forward and backward. A follower 1331 provided on a fixed ground plate 133 (to be described later) of the third group barrel 130 follows the second cam groove 1042, whereby the third group barrel 130 is moved in the optical axis direction according to the rotation of the cam barrel 104. Move forward and backward.

  The rotational position of the cam cylinder 104 can be detected by a detection means (not shown). The cam cylinder 104 may be rotated manually by a user or by a dedicated driving means such as a stepping motor or an ultrasonic motor (not shown). It is possible to change the relative positions in the optical axis direction of the second group barrel 120 and the third group barrel 130 following the different first cam grooves 1041 and second cam grooves 1042 depending on the rotation operation of the cam barrel 104. .

  The first group barrel 110 includes a first group lens holder 112 that holds the first group lens 111 and is fixed to the fixed barrel 103. The second group lens barrel 120 corresponds to an example of the first image blur correction device of the present invention, and the third group lens barrel 130 corresponds to an example of the second image blur correction device of the present invention. Details of the second group barrel 120 and the third group barrel 130 will be described later.

  The fourth group barrel 140 has a fourth group lens holder 142 that holds the fourth group lens 141. In the present embodiment, the fourth group lens 141 is constituted by a focus lens. The fourth group lens holder 142 is provided with a sleeve 1411, a rotation stop groove 1412, and a nut 1413 (see FIG. 1).

  The sleeve 1411 is fitted to a main bar 143 fixed to the element holder 102 so as to be movable in the optical axis direction, thereby holding the fourth group lens holder 142 so as to be movable back and forth in the optical axis direction. The anti-rotation groove 1412 engages with the sub bar 144 fixed to the element holder 102 to restrict the fourth group lens holder 142 from rotating about the main bar 143. The nut 1413 is screwed into a lead screw provided on the rotating shaft of the stepping motor 145.

  Therefore, when the stepping motor 145 is driven, the fourth group lens holder 142 holding the fourth group lens 141 is moved forward and backward in the optical axis direction by the screw action of the lead screw and the nut 1413, thereby performing a focusing operation.

  Next, the second group barrel 120 will be described with reference to FIGS. FIG. 4 is an exploded perspective view of the second group barrel 120. FIG. 5 is a cross-sectional view of the second group barrel 120 along the optical axis direction. As shown in FIGS. 2 to 5, the second group lens barrel 120 includes a correction lens 121, a movable member 122, a fixed ground plate 123, rolling balls 124, electromagnetic driving units 125 and 126, an urging spring 127, a position sensor 128, And a sensor holder 129.

  The movable member 122 holds the magnet 1251 of the electromagnetic drive unit 125 and the magnet 1261 of the electromagnetic drive unit 126, and holds the correction lens 121 in the central opening. The movable member 122 is movably supported in a plane that intersects (substantially orthogonal to) the optical axis substantially at right angles by rolling balls 124 that are arranged at three positions at regular intervals in the circumferential direction between the movable member 122 and the fixed base plate 123. Is done. In addition, one end of three urging springs 127 is hooked on the movable member 122. Here, the correction lens 121 corresponds to an example of the first image blur correction optical system of the present invention, and the movable member 122 corresponds to an example of the first movable member of the present invention.

  In the fixed ground plate 123, three followers 1231 projecting radially outward are formed on the outer peripheral portion at substantially equal intervals in the circumferential direction. A movable member 122 is disposed in the central opening of the fixed ground plate 123, thereby limiting the amount of movement of the movable member 122 in the direction substantially orthogonal to the optical axis.

  The fixed ground plate 123 holds the coil 1252 and the yoke 1253 of the electromagnetic driving unit 125 and also holds the coil 1262 and the yoke 1263 of the electromagnetic driving unit 126. The coil 1252 and the yoke 1253 are arranged to face the magnetized surface of the magnet 1251 held by the movable member 122 in the optical axis direction, and the coil 1262 and the yoke 1263 are magnetized by the magnet 1261 held by the movable member 122. Opposed to the surface in the optical axis direction.

  The fixed ground plate 123 is provided with three receiving portions for the rolling balls 124 at substantially equal intervals in the circumferential direction. The movable member 122 is supported by the fixed ground plate 123 movably in a plane orthogonal to the optical axis via three rolling balls 124 disposed between the fixed ground plate 123 and the movable member 122. Further, the other end of the three biasing springs 127 is hooked to the fixed ground plate 123. Here, the fixed ground plate 123 corresponds to an example of the first fixing member of the present invention.

  The electromagnetic driving units 125 and 126 are both configured by a voice coil motor or the like, and the electromagnetic driving unit 125 includes a magnet 1251, a coil 1252, and a yoke 1253, and the electromagnetic driving unit 126 includes a magnet 1261, a coil 1262, and a yoke. 1263. Here, the electromagnetic drive unit 125 corresponds to an example of the first electromagnetic drive unit of the present invention, and the electromagnetic drive unit 126 corresponds to an example of the second electromagnetic drive unit of the present invention.

  The electromagnetic drive unit 125 generates a Lorentz force between the magnet 1251 held by the movable member 122 by causing a current to flow through the coil 1252 held by the fixed ground plate 123, and makes the movable member 122 substantially orthogonal to the optical axis. Drive in the first direction. In this embodiment, since the coil 1252 is sandwiched between the magnet 1251 and the yoke 1253 in the optical axis direction, the magnetic flux generated by the magnet 1251 can be efficiently converted into a driving force.

  The electromagnetic drive unit 126 is arranged with a 90 ° phase shift with respect to the electromagnetic drive unit 125. Then, a current is passed through the coil 1262 held on the fixed ground plate 123 to generate a Lorentz force with the magnet 1261 held on the movable member 122, thereby making the movable member 122 substantially orthogonal to the optical axis. And in a second direction substantially orthogonal to the first direction. Also in this embodiment, since the coil 1262 is sandwiched between the magnet 1261 and the yoke 1263 in the optical axis direction, the magnetic flux generated by the magnet 1261 can be efficiently converted into a driving force.

  In this embodiment, the urging spring 127 is constituted by a tension coil spring, and one end is hooked to the movable member 122 and the other end is hooked to the fixed ground plate 123 to connect the movable member 122 and the fixed ground plate 123 to each other. Energize in the approaching direction. By this urging force, the rolling ball 124 is sandwiched between the movable member 122 and the fixed ground plate 123, and the contact state between the rolling ball 124, the fixed ground plate 123, and the movable member 122 can be maintained.

  The position sensor 128 includes a magnetic sensor, and two position sensors 128 are arranged to detect magnetic fluxes of the magnet 1251 and the magnet 1261, respectively. Based on the output changes of the two position sensors 128, the position in the plane substantially orthogonal to the optical axis of the movable member 122 can be detected.

  The sensor holder 129 holds the two position sensors 128 at positions facing the magnets 1251 and 1261 in the optical axis direction, respectively. In addition, the sensor holder 129 is fixed to the fixed ground plate 123, so that the movable member 122, the electromagnetic drive units 125 and 126, and the like are accommodated in the space between the sensor holder 129 and the fixed ground plate 123.

  Next, returning to FIGS. 2 and 3, the third group barrel 130 will be described. As shown in FIGS. 2 and 3, the third group lens barrel 130 includes a correction lens 131, a movable member 132, a fixed ground plate 133, a rolling ball 134 (not shown), electromagnetic drive units 135 and 136 (see FIG. 7), An urging spring 137 (see FIG. 6), a position sensor 138, and a sensor holder 139 are provided. The electromagnetic drive unit 135 drives the movable member 132 in a third direction substantially orthogonal to the optical axis, and the electromagnetic drive unit 136 causes the movable member 132 to be substantially orthogonal to the optical axis and substantially orthogonal to the third direction. Drive in the fourth direction.

  Here, the correction lens 131 corresponds to an example of the second image blur correction optical system of the present invention, the movable member 132 corresponds to an example of the second movable member of the present invention, and the fixed ground plate 133 This corresponds to an example of the second fixing member of the invention. The electromagnetic drive unit 135 corresponds to an example of a third electromagnetic drive unit of the present invention, and the electromagnetic drive unit 136 corresponds to an example of a fourth electromagnetic drive unit of the present invention. The third group barrel 130 has the same configuration as that of the second group barrel 120 described above except for the shape of the correction lens 131 and the shape of the movable member 132 that holds the correction lens 131, and a description thereof will be omitted. .

  Next, the positional relationship between the second group barrel 120 and the third group barrel 130 will be described with reference to FIGS. FIG. 6 is an exploded perspective view of a part of the second group barrel 120 and the third group barrel 130. FIG. 7 is a view of the movable member 122 of the second group barrel 120 and the movable member 132 of the third group barrel 130 as viewed from the optical axis direction.

  As shown in FIGS. 6 and 7, the electromagnetic drive unit 125 of the second group barrel 120 and the electromagnetic drive unit 135 of the third group barrel 130 are arranged on opposite sides with the optical axis in between. The electromagnetic drive unit 126 of the second group barrel 120 and the electromagnetic drive unit 136 of the third group barrel 130 are also arranged on opposite sides with the optical axis in between.

  That is, as shown in FIG. 7, when the regions divided into four equal parts in the circumferential direction about 90 ° around the optical axis are defined as first region to fourth region in the counterclockwise direction, the electromagnetic drive of the second group barrel 120 The part 125 is disposed in the first region, and the electromagnetic driving unit 126 of the second group barrel 120 is disposed in the second region. Further, the electromagnetic drive unit 135 of the third group barrel 130 is disposed in the third region, and the electromagnetic drive unit 136 of the third group barrel 130 is disposed in the fourth region. Therefore, even if the second group barrel 120 and the third group barrel 130 are close to each other in the optical axis direction, the distance between the respective electromagnetic drive units is ensured, and magnetic interference between the electromagnetic drive units or Mechanical interference can be avoided.

  This effect will be described with reference to FIGS. 7 and 8 by taking as an example the amount of magnetic interference that the electromagnetic drive unit 125 of the second group barrel 120 gives to the electromagnetic drive unit 136 of the third group barrel 130. FIG. 8 is a graph showing the relationship between the distance between the electromagnetic drive units 125 and 136 and the amount of magnetic interference that the electromagnetic drive unit 125 gives to the electromagnetic drive unit 136 in the present invention example and the comparative example. Here, in the present invention example, as shown in FIG. 7, the electromagnetic drive units 125 and 136 are arranged so as to be shifted from each other by 90 °, and in the comparative example, the electromagnetic drive units 125 and 136 are arranged so as to overlap each other in the optical axis direction. Shall be.

  The distance in the optical axis direction between the electromagnetic drive unit 125 and the electromagnetic drive unit 136 is 1 in a state where the electromagnetic drive unit 125 and the electromagnetic drive unit 136 are closest to the optical axis direction and the imaging optical system is zoomed to the wide angle side. 8 mm.

  In this state, in the comparative example, since the electromagnetic drive units 125 and 136 are arranged so as to overlap in the optical axis direction, the distance between the center points of the electromagnetic drive units 125 and 136 is 1.8 mm. On the other hand, in the present invention example, the distance between the center points of the electromagnetic drive units 125 and 136 (the distance between V1 and V4 in FIG. 7) is 8.59 mm.

  Assuming that the electromagnetic drive unit 125 is a single magnetic pole, the magnitude of the amount of magnetic interference from the electromagnetic drive unit 125 to the electromagnetic drive unit 136 is as shown in FIG. Inversely proportional to the square. Therefore, when the relative amount of magnetic interference in the comparative example in which the distance between the center points of the electromagnetic driving units 125 and 136 is 1.8 mm is set as 100%, the magnetic interference amount in the present invention example is The distance ratio between 136 is reduced to 0.04 times the square of the ratio (1.8 / 8.59). Thus, in the present invention example, the amount of magnetic interference between the electromagnetic drive units 125 and 135 can be reduced.

  In the present embodiment, the electromagnetic drive units 125 and 126 of the second group barrel 120 have the yokes 1253 and 1263 arranged on the third group barrel 130 side, so that the magnetic flux generated by the electromagnetic drive units 125 and 126 is 3 The influence on the group barrel 130 can be reduced. Similarly, since the electromagnetic driving portions 135 and 136 of the third group barrel 130 are provided with yokes 1353 and 1363 on the second group barrel 120 side, the magnetic flux generated by the electromagnetic driving portions 135 and 136 is generated by the second group barrel 120. Can be reduced.

  Accordingly, even when the second group barrel 120 and the third group barrel 130 are moved closer to each other in the optical axis direction, the magnetic interference between the electromagnetic drive units can be further reduced, and the second group barrel 120 and the third group barrel can be reduced. The distance in the optical axis direction with respect to 130 can be set in a wide range.

  In this embodiment, the fixed ground plate 123 of the second group barrel 120 and the fixed ground plate 133 of the third group barrel 130 are provided between the movable member 122 of the second group barrel 120 and the movable member 132 of the third group barrel 130. Is placed. The movable member 122 is supported so as to be able to roll with respect to the fixed ground plate 123 via the rolling balls 124, but when it receives an impact due to dropping or the like, it floats on the opposite side of the fixed ground plate 123. In addition, the movable member 132 is supported so as to be able to roll with respect to the fixed ground plate 133 via a rolling ball 134 (not shown). However, when the movable member 132 receives an impact due to dropping or the like, the movable member 132 is lifted to the opposite side of the fixed ground plate 133.

  Therefore, with the arrangement as described above, the distance between the movable member 122 of the second group barrel 120 and the movable member 132 of the third group barrel 130 is not reduced even when subjected to an impact. For this reason, even if the distance of the optical axis direction of the movable member 122 and the movable member 132 is shortened, mutual contact can be avoided.

  Next, an image blur correction method using the second group barrel 120 will be described with reference to FIGS. FIG. 9 is a block diagram of a control circuit that controls the driving of the electromagnetic drive unit 125 of the second group barrel 120. 9 is used for the electromagnetic drive unit 126 of the second group barrel 120 and the electromagnetic drive units 135 and 136 of the third group barrel 130. Only the electromagnetic drive unit 125 will be described.

  In FIG. 9, Cp is a command value obtained by converting a target position in a direction substantially orthogonal to the optical axis of the correction lens 121 held by the movable member 122 into a voltage. For calculation of the target position, a known method such as a method of integrating and phase compensating the output value of the angular accelerometer attached to the lens barrel or a method of calculating from the image information obtained from the image sensor is used. it can.

  Ap is a loop gain coefficient of the feedback circuit. A difference between the given command value Cp and the position of the movable member 122 obtained by the position sensor S (corresponding to the position sensor 128) is amplified by a loop gain coefficient Ap, and a voltage corresponding to the difference is applied to the electromagnetic drive unit 125. input. In the present embodiment, as will be described later, a plurality of values of the loop gain coefficient Ap are prepared, and the values are changed according to the magnification operation of the photographing optical system.

  F is a conversion coefficient between the voltage input to the electromagnetic drive unit 125 and the amount of displacement of the movable member 122. The displacement amount of the movable member 122 and the output voltage of the position sensor S have a relationship that can be approximately linearly approximated. The conversion coefficient F is determined by the thrust constant of the electromagnetic drive unit 125, the resistance and impedance of the coil 1252, the frequency of the input voltage, the mass of the movable member 122, the spring constant of the biasing spring 127, friction, and the like. By such a feedback control circuit, the position of the correction lens 121 can be made to accurately follow the command value Cp.

  Next, the output of the position sensor 128 of the second group barrel 120 will be described in detail with reference to FIG. FIG. 10 is a graph showing the relationship between the output voltage y of the position sensor 128 and the amount of displacement x in a direction substantially orthogonal to the optical axis of the movable member 122.

  In the present embodiment, when the distance between the lens groups is changed by the zooming operation of the photographing optical system, the image blur correction is performed by changing the distance in the optical axis direction between the second group barrel 120 and the third group barrel 130 accordingly. To improve the optical performance. At that time, the positional relationship between the position sensor 128 of the second group barrel 120 and the ferromagnetic material such as the magnet 1351 of the third group barrel 130 changes.

  In FIG. 10, when the photographing optical system is at the wide position, the curve is indicated by a solid line, and when the photographing optical system is at the tele position, the curve is indicated by a broken line. Thus, the influence of the magnetic force received by the position sensor 128 from other than the magnets 1251 and 1261 of the second group barrel 120 changes reproducibly according to the relative position of the third group barrel 130. In the present embodiment, when the distance in the optical axis direction between the second group barrel 120 and the third group barrel 130 changes, the influence of the magnetic force that the position sensor 128 receives from the magnet 1351 of the third group barrel 130 does not change. The relationship between the output voltage y of the position sensor 128 and the displacement amount x of the movable member 122 is changed.

  Specifically, the gain coefficient A of the position sensor 128, which is a proportional constant between the displacement amount x of the movable member 122 and the output voltage y of the position sensor 128, and the offset amount B of the output voltage of the position sensor 128, A plurality are prepared and stored in a memory (not shown). The control unit (not shown) is affected by the magnetic force that the position sensor 128 receives from the magnet 1351 of the third group barrel 130 according to the positional relationship between the second group barrel 120 and the third group barrel 130 in the optical axis direction. Appropriate values of gain coefficient A and offset amount B are selected so as not to change. Thereby, it is possible to further reduce the influence of magnetic interference due to the position change of the second group barrel 120 and the third group barrel 130 in the optical axis direction.

  For the same reason, the thrust constant and the like of the electromagnetic drive unit 125 change with reproducibility according to the positional relationship between the second group barrel 120 and the third group barrel 130 in the optical axis direction. Therefore, the value of the loop gain coefficient Ap that optimizes the characteristics of the control system also changes according to the positional relationship between the second group barrel 120 and the third group barrel 130 in the optical axis direction. In the present embodiment, the control unit is optimal from the values of a plurality of loop gain coefficients Ap stored in advance in a memory or the like according to the positional relationship between the second group barrel 120 and the third group barrel 130 in the optical axis direction. By selecting a value, the changed thrust constant or the like of the electromagnetic driving unit 125 is changed to an appropriate value. Here, the gain coefficient A, the offset amount B, and the loop gain coefficient Ap are parameters representing the relationship between the displacement amount x of the movable member 122 and the output voltage y of the position sensor 128.

  Information on the positional relationship of the second group barrel 120 and the third group barrel 130 in the optical axis direction can be acquired based on, for example, the detection result of the rotation angle of the cam barrel 103. The rotation angle of the cam cylinder 104 may be detected directly using a detection means (not shown). When a dedicated motor is used for the rotation of the cam cylinder 104, a means for detecting the rotation amount of the motor is provided. It may be used.

  As described above, in the present embodiment, when the interval between the lens groups of the photographing optical system changes due to zooming, focusing, or the like, the optical axis direction between the second group barrel 120 and the third group barrel 130 is changed accordingly. The optical performance of image blur correction can be improved by changing the distance. Further, in the present embodiment, the influence of magnetic interference due to the position change of the second group barrel 120 and the third group barrel 130 in the optical axis direction can be reduced, so that the optical axes of the movable members 122 and 132 are substantially orthogonal. High-precision position control in the direction can be realized.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

  For example, in the above embodiment, the correction lens is exemplified as the image blur correction optical system, but an image sensor such as a CCD sensor or a CMOS sensor may be used.

120 Second group lens barrel 122 Movable member 122 Fixed ground plate 125, 126 Electromagnetic drive unit 130 Third group lens barrel 132 Movable member 132 Fixed ground plate 135, 136 Electromagnetic drive unit

Claims (10)

A first movable member that holds the first image blur correction optical system, a first fixed member that movably supports the first movable member in a direction that intersects the optical axis, and a light beam that supports the first movable member. A first image blur having a first electromagnetic drive unit that drives in a first direction that intersects the axis, and a second electromagnetic drive unit that drives the first movable member in a second direction that intersects the optical axis. A correction device;
A second movable member that holds the second image blur correction optical system; a second fixed member that movably supports the second movable member in a direction that intersects the optical axis; and A second image blur having a third electromagnetic drive unit that drives in a third direction that intersects the axis, and a fourth electromagnetic drive unit that drives the second movable member in a fourth direction that intersects the optical axis. A correction device,
The first image blur correction device is movable relative to the second image blur correction device in the optical axis direction;
When the regions divided into four equal parts in the circumferential direction about the optical axis are divided into four regions, the first region, the second region, the third region, and the fourth region, respectively, the first electromagnetic driving unit Arranged in one region, the second electromagnetic drive unit is arranged in the second region, the third electromagnetic drive unit is arranged in the third region, and the fourth electromagnetic drive unit is A lens barrel arranged in the fourth region.   2. The lens barrel according to claim 1, further comprising operation means for changing a position of the second image blur correction device in the optical axis direction with respect to the first image blur correction device. A position sensor for detecting a position of the first movable member in a direction intersecting the optical axis with respect to the first fixed member;
And a control unit that feedback-controls a voltage input to the first electromagnetic driving unit so that the first movable member moves to a target position based on an output of the position sensor. The lens barrel according to 1 or 2. Detecting means for detecting a relative position in the optical axis direction of the second image blur correction device with respect to the first image blur correction device;
The control means detects light of the first movable member according to a change in a relative position of the second image blur correction apparatus in the optical axis direction with respect to the first image blur correction apparatus detected by the detection means. The lens barrel according to claim 3, wherein a parameter representing a relationship between a displacement amount in a direction intersecting the axis and an output of the position sensor is changed.   The parameters include a gain coefficient of the position sensor, which is a proportional constant between the displacement amount of the first movable member and the output of the position sensor, an offset amount of the output of the position sensor, and the first electromagnetic wave. The lens barrel according to claim 4, wherein the lens barrel is at least one of loop gain coefficients in feedback control of the drive unit.   The said 1st fixing member and the said 2nd fixing member are arrange | positioned between the said 1st movable member and the said 2nd movable member, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. The lens barrel described in 1. The first electromagnetic drive unit includes a first magnet, a first coil, and a first yoke, and the first movable member holds the first magnet,
The lens barrel according to claim 6, wherein the first fixing member holds the first coil and the first yoke. The third electromagnetic drive unit has a second magnet, a second coil, and a second yoke, and the second movable member holds the second magnet,
The lens barrel according to claim 7, wherein the second fixing member holds the second coil and the second yoke. An imaging device comprising a lens barrel,
An imaging apparatus comprising the lens barrel according to claim 1 as the lens barrel. A first movable member that holds the first image blur correction optical system, a first fixed member that movably supports the first movable member in a direction that intersects the optical axis, and a light beam that supports the first movable member. A first image blur having a first electromagnetic drive unit that drives in a first direction that intersects the axis, and a second electromagnetic drive unit that drives the first movable member in a second direction that intersects the optical axis. A correction device;
A second movable member that holds the second image blur correction optical system; a second fixed member that movably supports the second movable member in a direction that intersects the optical axis; and A second image blur having a third electromagnetic drive unit that drives in a third direction that intersects the axis, and a fourth electromagnetic drive unit that drives the second movable member in a fourth direction that intersects the optical axis. A correction device,
The first image blur correction device is movable relative to the second image blur correction device in the optical axis direction;
When the regions divided into four equal parts in the circumferential direction about the optical axis are divided into four regions, the first region, the second region, the third region, and the fourth region, respectively, the first electromagnetic driving unit Arranged in one region, the second electromagnetic drive unit is arranged in the second region, the third electromagnetic drive unit is arranged in the third region, and the fourth electromagnetic drive unit is An image pickup apparatus arranged in a fourth region.

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