JP2007148023A - Image blur correcting device and imaging apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image blur correcting device capable of securing the driving force of a correction lens and made small in size and light in weight, and also to provide an imaging apparatus. <P>SOLUTION: The image blur correcting device 30 is equipped with: a correction lens 20A correcting the blur of an image formed by an image-formation optical system; a holding frame 34 for the correction lens 20A supported movably on a plane orthogonal to an optical axis O; an X slider 36 and a Y slider 38 respectively supported to freely slide in a direction X and a direction Y and also engaged with the holding frame 34; and an X motor 40 and a Y motor 42 moving the sliders 36 and 38 in the direction X and the direction Y respectively. The yoke part 68 of the X motor 40 and the yoke part 69 of the Y motor 42 are integrally formed on a lens barrel 61 by including magnetic material in the lens barrel 61. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image blur correction apparatus and an image pickup apparatus using the same, and more particularly to an image blur correction apparatus mounted on a thin digital camera.

  In recent years, digital cameras that have been made thinner by using a bending optical system have been developed. Even in such a thin digital camera, there is a demand for mounting an image blur correction device that corrects an image blur of the imaging optical system.

The camera shake correction device supports the correction lens movably in a plane orthogonal to the photographing optical axis, and moves the correction lens with an actuator in a direction to cancel the vibration when the camera is vibrated. Image blur is corrected. For example, in the image blur correction apparatuses described in Patent Documents 1 to 3, the support frame of the correction lens is supported so as to be movable in the pitch direction and the yaw direction, and the support frame is pitched by a voice coil motor including a coil, a magnet, and a yoke. Direction and yaw direction to correct image blur.
JP-A-10-26779 Japanese Patent Laid-Open No. 2000-19577 Patent 2641172

  However, the image blur correction apparatuses described in Patent Documents 1 to 3 have a problem that a large yoke or a plurality of yokes are required to increase the magnetic force, and the camera is increased in size and weight by the yoke. For this reason, it is desired to reduce the yoke or to reduce the number of yokes. However, in this case, there is a problem that the magnetic force becomes weak and the driving force of the motor decreases.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an image blur correction apparatus and an imaging apparatus that can sufficiently secure the driving force of the correction lens and that can be reduced in size and weight. And

  In order to achieve the above object, the invention according to claim 1 corrects an image blur formed by the imaging optical system, holds the correction optical system, and emits light from the imaging optical system. A holding frame supported movably in a plane perpendicular to the axis, and supported by the main body so as to be slidable in first and second directions perpendicular to the optical axis, and to the holding frame. The first and second sliders are combined with a coil, a magnet, and a yoke portion, and one of the coils and the magnet is supported by the first and second sliders, and the coil is energized. First and second driving means for driving the first and second sliders in the first and second directions, respectively, and the yoke portion is a lens barrel of the imaging optical system, and the main body Or the first, 2 of the slider, by containing the magnetic material, or, characterized in that it is constituted by forming a surface layer of magnetic material.

  According to the invention described in claim 1, since the yoke portion is formed by adding a magnetic material to the lens barrel, the main body, or the first and second sliders, or by forming a surface layer of the magnetic material, The yoke portion is formed integrally with the lens barrel, the main body, or the first and second sliders. Therefore, the first and second driving means can be reduced in weight and size, and the image blur correction device can be reduced in size and weight.

  According to a second aspect of the present invention, in the first aspect of the invention, the magnetic material is a soft magnetic material. According to the invention of claim 2, since the yoke portion is made of a soft magnetic material (Fe type), the magnetism of the yoke portion is lost when no current is passed through the coil, and the influence of the magnetic material can be suppressed as much as possible. it can.

  In order to achieve the above object, the invention according to claim 3 is disposed on the optical axis bent by the bending means and the imaging optical system having a bending means for bending the optical axis toward the imaging position. The image blur correction device according to claim 1 or 2 is provided.

  Since the image blur correction device of the present invention can be reduced in size and weight, it is particularly effective in an imaging device that is downsized using a bending optical system.

  According to the present invention, the yoke portion is made to be the lens barrel, the main body, or the first by adding the magnetic material to the lens barrel, the main body, or the first and second sliders, or forming the surface layer of the magnetic material. Since it is formed integrally with the second slider, the image blur correction device can be reduced in size and weight.

  Preferred embodiments of an image blur correction apparatus and an imaging apparatus according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a digital camera 10 to which an image blur correction apparatus according to the present invention is applied. In the digital camera 10 shown in the figure, a case 11 is formed in a thin rectangular shape, and a fixed lens 16A constituting a first lens group 16 of a photographing lens and a strobe light emitting unit 13 are formed on the front surface of the case 11. , And a light control sensor 15 for strobe. A shutter button 14 and a power switch 17 are disposed on the upper surface of the case 11. Hereinafter, when viewing the case 11 from the front, the left-right direction is the X direction, the depth (thickness) direction is the Y direction, and the height direction is the Z direction.

  FIG. 2 is a longitudinal sectional view of the digital camera 10. As shown in the figure, a camera body 12 is provided inside the case 11, and further, a first lens group 16, a second lens group 18, a third lens group 20, and a fourth lens are provided inside the camera body 12. A group 22 is provided. The first lens group 16A, the second lens group 18, and the fourth lens group 22 constitute an imaging optical system, and the third lens group 20 corrects optics for correcting image blur obtained by the imaging optical system. The system is configured.

  The first lens group 16 includes a fixed lens 16A disposed in front of the case 11, a prism 16B disposed on the inner side (back side) of the fixed lens 16A, and a fixed lens 16C disposed below the prism 16B. The optical path of the observation image formed through the fixed lens 16A is bent downward by 90 ° by the prism 16B.

  The second lens group 18, the third lens group 20, and the fourth lens group 22 are arranged below the first lens group 16, that is, along the optical axis in the Z direction (hereinafter simply referred to as the optical axis O). .

  The second lens group 18 and the fourth lens group 22 are slidably disposed along the optical axis O, and are slid and moved in the direction of the optical axis O by a driving unit (not shown). A zoom operation is performed by sliding the second lens group 18, and a focus operation is performed by sliding the fourth lens group 22.

  A CCD 26 is disposed at the imaging position 24 below the fourth lens group 22. Note that reference numeral 28 in FIG. 2 is an antireflection surface in which fine irregularities are repeatedly formed, and prevents light incident from the fixed lens 16A of the first lens group 16 from being reflected. Reference numeral 27 denotes a shutter.

  The third lens group 20 includes a movable correction lens 20A and a fixed correction lens 20B, and moves the movable correction lens 20A in a plane orthogonal to the optical axis O (that is, in the XY plane). Image blurring is corrected. Hereinafter, the configuration of the image blur correction apparatus 30 that moves the correction lens 20A will be described.

  FIG. 3 is a perspective view showing the image blur correction device 30, and FIG. 4 is an exploded perspective view thereof. FIG. 5 is a plan view of the image blur correction device 30. FIG. 6 is a plan view in which the holding frame 34 of FIG. 5 is removed.

  As shown in FIG. 4, the image blur correction device 30 mainly includes a substantially cylindrical main body 32, a holding frame 34 that is movably supported by the main body 32, and holds the correction lens 20 </ b> A, and engages with the holding frame 34. And an X motor 40 and a Y motor 42 (corresponding to an actuator) for driving the X slider 36 and the Y slider 38 in the X direction and the Y direction, respectively.

  As shown in FIG. 4, three guide bars 44, 45, 46 are attached to the holding frame 34. As shown in FIG. 5, the guide bar 44 is attached along the X direction at a substantially central position of the side surface of the holding frame 34 in the Y direction. The guide bar 45 is attached along the Y direction at a substantially central position of the side surface of the holding frame 34 in the X direction. The guide bar 46 is attached to the corner portion of the holding frame 34 farthest from the guide bars 44 and 45 along the diagonal direction.

  Each of the guide bars 44 to 46 is inserted into the long holes 32 </ b> A to 32 </ b> C of the main body 32. As shown in FIG. 8, the long hole 32A is formed such that the dimension L3 in the optical axis O direction (Z direction) is substantially the same as the diameter D2 of the guide bar 44, and the direction perpendicular to the optical axis O (Y direction). ) L4 is formed to be larger than the diameter D2 of the guide bar 44. Therefore, the guide bar 44 is engaged with the long hole 32A with no gap in the direction of the optical axis O, and is supported so as to be movable in a direction perpendicular to the optical axis O.

  Similarly, the slot 32B in FIG. 5 is formed so that the dimension in the optical axis O direction is substantially the same as the diameter of the guide bar 45, and the dimension in the direction orthogonal to the optical axis O is larger than the diameter of the guide bar 45. Largely formed. The long hole 32C is formed so that the dimension in the optical axis O direction is substantially the same as the diameter of the guide bar 46, and the dimension in the direction orthogonal to the optical axis O is larger than the diameter of the guide bar 46. Yes. Therefore, the guide bars 45 and 46 are engaged with the long holes 32B and 32C in a state where there is no gap in the optical axis O direction, and are supported so as to be movable in a direction orthogonal to the optical axis O. As a result, the holding frame 34 is supported in a state free from backlash in the direction of the optical axis O and movably in a direction perpendicular to the optical axis O.

  A movable guide shaft 48 is attached to the holding frame 34 along the Y direction on the side surface opposite to the side surface on which the guide bar 44 is attached. Furthermore, a movable guide shaft 49 is attached to the holding frame 34 along the X direction on the side surface opposite to the side surface to which the guide bar 45 is attached. An X slider 36 and a Y slider 38 are slidably engaged with these movable guide shafts 48 and 49, respectively.

  As shown in FIGS. 6 and 7, the X slider 36 and the Y slider 38 are formed in a shape that is plane symmetric. That is, as shown in FIG. 6, the X slider 36 is formed in a substantially L shape, and the Y slider 38 is reversed so that the X slider 36 has a plane symmetrical shape with respect to the symmetry plane indicated by the two-dot chain line. It is formed in an L shape.

  The X slider 36 is formed with guide holes 50 and 50 through which the above-described movable guide shaft 48 (see FIG. 5) is inserted. The X slider 36 is slidably engaged with the holding frame 34 in the Y direction by inserting the movable guide shaft 48 through the guide holes 50 and 50.

  As shown in FIGS. 7 and 9, each guide hole 50 is formed in an oval shape that is longer in the Z direction than in the X direction. Specifically, the dimension L1 in the X direction of the guide hole 50 is formed to be approximately the same as the outer diameter dimension D1 of the movable guide shaft 48, and the dimension L2 in the Z direction of the guide hole 50 is the movable guide shaft 48. Is formed larger than the outer diameter D1. Therefore, when the movable guide shaft 48 is inserted into the guide hole 50, the movable guide shaft 48 and the guide hole 50 are engaged with each other with no gap in the X direction. Therefore, when the X slider 36 is moved in the X direction, the holding frame 34 can be accurately moved in the X direction via the movable guide shaft 48. On the other hand, since there is a gap in the Z direction, the movable guide shaft 48 can be easily inserted into the guide hole 50, and the assemblability is good.

  As shown in FIG. 7, the X slider 36 has a through hole 52 formed in the X direction. A fixed guide shaft 54 shown in FIG. 6 is inserted through the through hole 52. The fixed guide shaft 54 is disposed along the X direction, and both ends thereof are fixed to the main body 32. Accordingly, the X slider 36 is supported by the main body 32 so as to be slidable in the X direction. The cross-sectional shape of the through hole 52 is not particularly limited, but may be circular or may be formed in an oval shape that is long in the Z direction like the guide hole 50.

  As shown in FIG. 4, the substrate 60 is attached to the X slider 36 so as to be parallel to the optical axis O. A coil 58 constituting the X motor 40 is printed on the substrate 60. The coil 58 is printed in multiple layers, and its terminals are provided on both sides of the substrate 60. That is, terminals 62 and 62 are provided on the front surface 60A of the substrate 60 as shown in FIG. 10A, and terminals 63 and 63 are provided on the back surface 60B of the substrate 60 as shown in FIG. 10B. Therefore, if one of the terminals 62 and 62 and the terminals 63 and 63 is connected to a conducting wire, a current can be passed through the coil 58. The substrate 60 to be mounted on the X slider 36 has conductors connected to the inner terminals 63 and 63.

  The substrate 60 is formed with engagement protrusions 60C and engagement holes 60D and 60D. By engaging the engagement protrusion 60C and the engagement holes 60D and 60D with the engagement groove (not shown) of the X slider 36 and the engagement pins 56 and 56 of FIG. It is attached.

  The X motor 40 includes the coil 58, the plate-shaped magnet 64, the plate-shaped yoke 66, and the yoke portion 68 described above. The magnet 64 is attached to the yoke 66 and attached to the main body 32 while facing the coil 58.

  The yoke portion 68 is disposed on the opposite side of the magnet 64 with the coil 58 interposed therebetween. The yoke portion 68 is formed integrally with the lens barrel 61. The lens barrel 61 is a cylindrical body that supports a part of the imaging optical system described above, and is arranged in a state of entering the inside of the main body 32. The lens barrel 61 is entirely made of resin, and a yoke portion 68 is formed in a portion facing the coil 58 by containing a powdery magnetic material. The kind of the magnetic material is not particularly limited, but a soft magnetic material (Fe series) is preferable. The yoke portion 68 made of a soft magnetic material acts as a yoke that temporarily collects magnetic flux only when a current is passed through the coil 58. Therefore, by configuring the yoke portion 68 of soft magnetic material, the influence of magnetism on other members can be minimized.

  In the X motor 40 configured as described above, when the coil 58 is energized, the X slider 36 holding the coil 58 is moved in the X direction. Therefore, the holding frame 34 engaged with the X slider 36 via the movable guide shaft 48 can be driven in the X direction.

  On the other hand, the Y slider 38 is formed with guide holes 51 and 51 through which the above-described movable guide shaft 49 is inserted. The Y slider 38 is slidably engaged with the holding frame 34 in the X direction by inserting the movable guide shaft 49 through the guide holes 51 and 51.

  Each guide hole 51 is formed in an oval shape that is long in the Z direction, like the guide hole 50 shown in FIG. Specifically, the dimension of the guide hole 51 in the Y direction is substantially the same as the outer diameter of the movable guide shaft 49, and the dimension of the guide hole 51 in the Z direction is larger than the outer diameter of the movable guide shaft 49. Is formed. Therefore, when the movable guide shaft 49 is inserted through the guide hole 51, the movable guide shaft 49 and the guide hole 51 are engaged with each other with no gap in the Y direction. Therefore, when the Y slider 38 is moved in the Y direction, the holding frame 34 can be accurately moved in the Y direction via the movable guide shaft 49. On the other hand, since there is a gap in the Z direction, the movable guide shaft 49 can be easily inserted into the guide hole 51, and the assemblability is good.

  A through hole 53 is formed in the Y slider 38 in the Y direction, and the fixed guide shaft 55 is inserted into the through hole 53. The fixed guide shaft 55 is disposed along the Y direction, and both ends thereof are fixed to the main body 32. Thereby, the Y slider 38 is supported by the main body 32 so as to be slidable in the Y direction. The cross-sectional shape of the through hole 53 is not particularly limited, but may be circular or may be formed in an oval shape that is long in the Z direction like the guide hole 51.

  A substrate 60 is attached to the Y slider 38 so as to be parallel to the optical axis O. The substrate 60 is the same as the substrate 60 attached to the X slider 36 described above, and the substrate 60 is formed with engagement protrusions 60C and engagement holes 60D and 60D. The substrate 60 is attached to the Y slider 38 by engaging the engagement protrusions 60 </ b> C and the engagement holes 60 </ b> D and 60 </ b> D with engagement grooves (not shown) of the Y slider 38 and engagement pins 57 and 57. At that time, the substrate 60 is mounted in different postures by the X slider 36 and the Y slider 38. That is, the front surface 60A of the substrate 60 is attached to the X slider 36 in a posture that faces outward (see FIG. 10A), and the rear surface 60B of the substrate 60 faces to the outer side in the Y slider 38 (see FIG. (See B)). The substrate 60 attached to the Y slider 38 is connected to the inner terminals 62 and 62 with conductive wires, and current is supplied through the conductive wires.

  The Y motor 42 includes the coil 58, the plate-shaped magnet 65, the plate-shaped yoke 67, and the yoke portion 69 described above. The magnet 65 is attached to the yoke 67 and attached to the main body 32 while facing the coil 58.

  The yoke portion 69 is disposed on the opposite side of the magnet 65 with the coil 58 interposed therebetween. The yoke portion 69 is formed integrally with the lens barrel 61 described above. That is, the lens barrel 61 contains a magnetic material in a portion facing the coil 58 of the Y motor 42, and thereby a yoke portion 69 is formed. Like the yoke portion 68, the yoke portion 69 is preferably configured to contain a soft magnetic material. As a result, the yoke portion 69 acts as a yoke that temporarily collects magnetic flux only when a current is passed through the coil 58, so that the influence of magnetism on other members can be minimized.

  In the Y motor 42 configured as described above, when the coil 58 is energized, the Y slider 38 holding the coil 58 is moved in the Y direction. Therefore, the holding frame 34 engaged with the Y slider 38 via the movable guide shaft 49 can be driven in the Y direction.

  The image blur correction device 30 may be provided with a position detection sensor (not shown) that detects the positions of the X slider 36 and the Y slider 38. The type of the position detection sensor is not particularly limited. For example, a hall element attached to the X slider 36 and the Y slider 38 and a magnet disposed opposite to the hall element and fixed to the main body 32 are used. Configure. Thereby, the position of the X slider 36 and the Y slider 38, that is, the position of the holding frame 34 can be controlled.

  Further, a vibration detection sensor (not shown) may be provided in the camera body 12 of the camera 10 and the X motor 40 and the Y motor 42 may be driven and controlled according to the detection value of this sensor.

  In the image blur correction device 30 configured as described above, when the vibration of the camera 10 is detected by a sensor (not shown), the X motor 40 or the Y motor 42 or both motors 40 are selected according to the detected vibration direction. , 42 are driven. When the X motor 40 is driven, the coil 58 is energized, and the X slider 36 holding the coil 58 moves in the X direction. Accordingly, the holding frame 34 engaged with the X slider 36 via the movable guide shaft 48 moves in the X direction, and the correction lens 20A moves in the X direction. At that time, the Y slider 38 is slidably engaged with the holding frame 34 in the X direction, and therefore does not move. Therefore, when the X motor 40 is driven, only the X slider 36 can be moved independently without moving the Y slider 38 and the Y motor 42, and the holding frame 34 can be moved quickly.

  Further, when the X motor 40 is driven, the movable guide shaft 48 and the guide hole 50 of the X slider 36 are engaged with no gap in the X direction, so that the holding frame 34 is moved in the X direction with high accuracy. be able to. Thus, according to the present embodiment, when the X motor 40 is driven, the holding frame 34 can be quickly moved with high accuracy in the X direction.

  Similarly, when the Y motor 42 is driven, the Y slider 38 holding the coil 58 moves in the Y direction. Therefore, the holding frame 34 engaged with the Y slider 38 via the movable guide shaft 49 moves in the Y direction, and the correction lens 20A moves in the Y direction. At that time, the X slider 36 is slidably engaged with the holding frame 34 in the Y direction, and therefore does not move. Therefore, when the Y motor 42 is driven, only the Y slider 38 can be moved independently without moving the X slider 36 and the X motor 40, and the holding frame 34 can be moved quickly.

  Further, when the Y motor 42 is driven, the movable guide shaft 49 and the guide hole 51 of the Y slider 38 are engaged with no gap in the Y direction, so that the holding frame 34 is moved in the Y direction with high accuracy. be able to. Thus, according to the present embodiment, when the Y motor 42 is driven, the holding frame 34 can be quickly moved with high accuracy in the Y direction.

  Next, the operation of the image blur correction device 30 configured as described above will be described with reference to FIGS. 11 (a) and 11 (b). FIG. 11A is a cross-sectional view schematically showing the configuration of a motor as a comparative example, and FIG. 11B is a cross-sectional view schematically showing the configuration of the X motor 40 of the present embodiment. Although the operation of the X motor 40 will be described below, the operation of the Y motor 42 is the same as that of the X motor 40, and the description thereof is omitted.

  The X motor 40 is a voice coil motor, and the driving force changes according to the strength of the magnetic field. If the magnetic force is weak, a sufficient driving force cannot be obtained. Therefore, a yoke is generally used to bundle magnetic flux.

  As shown in FIG. 11A, in the conventional motor, a plate-like magnet 2 is disposed facing the coil 1, and a yoke 3 made of a metal plate is disposed outside the magnet 2. A yoke 4 made of a metal plate is disposed on the opposite side of the magnet 2 with the coil 1 interposed therebetween, and is supported by a support member 5 such as a lens barrel or a main body. For this reason, the conventional motor requires a sufficient space for arranging the magnet 2 and the yokes 3 and 4 around the coil 1, and there is a problem that the image blur correction device is enlarged. In addition, since the yokes 3 and 4 that are metal plates are provided, there is a problem that the weight of the image blur correction device increases.

  On the other hand, in the image blur correction device 30 of the present embodiment, the yoke portion 68 of the X motor 40 is formed integrally with the lens barrel 61 as shown in FIG. Therefore, the image blur correction device 30 can be reduced in size and weight compared to the case where a yoke made of a metal plate is provided.

  Further, according to the present embodiment, since the yoke portion 68 of the X motor 40 is integrated with the lens barrel 61, the number of components can be reduced, and the assemblability is improved.

  In the above-described embodiment, a magnetic material is included in a part of the lens barrel 61 to form the yoke portions 68 and 69. However, the magnetic material is included in the entire lens barrel 61, or the entire lens barrel 61 is a metal material. Or may be formed.

  Further, in the above-described embodiment, the yoke portions 68 and 69 are formed by containing the magnetic material in the lens barrel 61. However, as long as the yoke portions 68 and 69 are integrally formed on the lens barrel 61. For example, the thin layer of the magnetic material may be formed by applying or spraying the magnetic material on the surface of the lens barrel 61. Also in this case, as in the above-described embodiment, the image blur correction device 30 can be reduced in size and weight.

  Moreover, although embodiment mentioned above is an example which integrated the yoke parts 68 and 69 with the lens barrel 61, the member which integrates the yoke parts 68 and 69 is not limited to the lens barrel 61, A coil Any member may be used as long as it is disposed in the vicinity of 58. Therefore, the yoke portions 68 and 69 may be integrally formed on the X slider 36, the Y slider 38, the substrate 60, and the like. Also in this case, the image blur correction device 30 can be reduced in size and weight by including a magnetic material or forming a surface layer of the magnetic material.

  Further, not only the yoke portions 68 and 69 but also the yokes 66 and 67 may be formed integrally with members around the coil 58. That is, instead of providing the metal plate yokes 66 and 67, the yoke portion may be formed integrally with the main body 32. Also in this case, the image blur correction device 30 can be reduced in size and weight by including a magnetic material in the main body 32 or forming a surface layer of the magnetic material.

  In the present invention, it is only necessary that the yoke is integrally formed on the peripheral members of the coils 58 of the motors 40 and 42, and the configuration of the image blur correction device 30 is not limited to the above-described embodiment. Therefore, for example, an image blur correction device 70 may be configured as shown in FIG.

  The image blur correction apparatus 70 shown in FIG. 12 mainly includes a holding frame 71 that holds the correction lens 20A, first and second sliders 72 and 73 that support the holding frame 71, and the first and second sliders. The first and second voice coil motors (hereinafter, referred to as first motor and second motor) 74 and 75 for moving 72 and 73 and a lens barrel 76 are included.

  The outer shape of the holding frame 71 is formed in a substantially rectangular shape. The holding frame 71 is supported so as to be movable in two orthogonal directions within a plane orthogonal to the optical axis O. Hereinafter, these two directions are referred to as a P (pitch) direction and a Y (yaw) direction. A P guide rod 77 arranged in the P direction and a Y guide rod 78 arranged in the Y direction are attached to the side surface of the holding frame 71.

  On the other hand, the lens barrel 76 holds a P guide rod 79 arranged in the P direction and a Y guide rod 80 arranged in the Y direction. The P guide rod 77 and the Y guide rod 78 are respectively arranged on the opposite sides of the P guide rod 79 and the Y guide rod 80 with the optical axis O interposed therebetween.

  The first slider 72 is formed in an approximately L shape, and two guide holes 72P (only one is shown) in the P direction are formed. By inserting the aforementioned P guide rod 79 into the guide hole 72P, the first slider 72 is supported slidably in the P direction with respect to the lens barrel 76.

  The first slider 72 has two guide holes 72Y and 72Y in the Y direction. By inserting the Y guide rod 78 into the guide holes 72Y and 72Y, the first slider 72 is supported so as to be movable in the Y direction with respect to the holding frame 71.

  The second slider 73 is formed in a shape that is plane-symmetric with respect to the first slider 72, and is formed in a substantially inverted L shape. The second slider 73 is formed with two guide holes 73Y (only one is shown) in the Y direction. By inserting the above-described guide rod 80 through the guide hole 73Y, the second slider 73 is supported slidably in the Y direction with respect to the lens barrel 76.

  The second slider 73 is formed with two guide holes 73P and 73P in the P direction. By inserting the aforementioned P guide rod 77 into the guide holes 73P and 73P, the second slider 73 is supported so as to be movable in the P direction with respect to the holding frame 71.

  In FIG. 12, reference numerals 81, 81... Are shock absorbing members made of a shock absorbing material such as rubber or urethane resin, and are formed in a cylindrical shape and inserted into P guide rods 77, 79 and Y guide rods 78, 80. It can be installed in the state. The buffer members 81, 81... Can prevent the first slider 72 and the second slider 73 from colliding with the holding frame 71 and the lens barrel 76 and being damaged.

  Further, reference numeral 82 in FIG. 12 denotes a magnet constituting a position detection sensor, which is attached to the lens barrel 76. A hall element (not shown) is attached to the first slider 72 and the second slider 73 so as to face the magnet 82. Based on the measured value of the position detection sensor, the first motor 74 and the second motor 75 are driven and controlled.

  The first motor 74 is mainly composed of a substrate 83, a magnet 84, a yoke portion 85, and a disk type yoke 86. Similarly, the second motor 75 includes a substrate 83, a magnet 87, a yoke portion 88, and a disk type yoke 86. The disk-type yoke 86 is shared by the first motor 74 and the second motor 75.

  A common substrate 83 is used for the first motor 74 and the second motor 75. A coil 90 is printed on the substrate 83. The coil 90 is formed in a rectangular frame shape that is long in the Y direction, and is printed in multiple layers. The terminals of the coil 90 are provided on both sides of the substrate. That is, terminals 91 and 91 are provided on one surface of the substrate 83, and terminals 92 and 92 are provided on the other surface of the substrate 83. In addition, mounting holes 93 and 93 are formed in the substrate 83, and an engaging protrusion (not shown) provided on the first slider 72 or the second slider 73 is inserted into the mounting holes 93 and 93. The substrate 83 is attached to the first slider 72 or the second slider 73.

  The board 83 of the first motor 74 is attached to the first slider 72 so that the surfaces of the terminals 91 and 91 are in contact with each other, and a conductor (not shown) is connected to the terminals 92 and 92. The board 83 of the second motor 75 is attached to the second slider 74 so that the surfaces of the terminals 92 and 92 are in contact with each other, and a conductor (not shown) is connected to the terminals 91 and 91.

  On the other hand, the disk-shaped yoke 86 is formed in a ring shape by a metal plate, and is disposed so as to face the substrates 83 and 83 by being attached to the lens barrel 76.

  The magnets 84 and 87 are fixed on the yoke portions 85 and 88, respectively, so that the magnets 84 and 87 are attached to the lens barrel 76 and disposed so as to face the substrates 83 and 83.

  The yoke portions 85 and 88 are formed integrally with the lens barrel 76. That is, the yoke portions 85 and 88 are integrally formed on the lens barrel 76 by incorporating a magnetic material into the lens barrel 76 or forming a surface layer of the magnetic material.

  Also in the case of the image blur correction device 70 configured as described above, since the yoke portions 85 and 88 are formed integrally with the lens barrel 76, the image blur correction device 70 can be reduced in size and weight. .

1 is a perspective view showing a digital camera to which an image blur correction apparatus according to the present invention is applied. 1 is a longitudinal sectional view of the digital camera of FIG. The perspective view which shows the image blurring correction apparatus which concerns on this invention FIG. 3 is an exploded perspective view of the image blur correction device in FIG. 3. FIG. 3 is a plan view of the image blur correction device of FIG. FIG. 5 is a plan view of the image blur correction apparatus with the holding frame of FIG. 5 removed. Perspective view showing X slider and Y slider Schematic diagram showing the shape of the guide of the holding frame Schematic diagram showing the shape of the X slider guide A perspective view showing a substrate holding a coil Explanatory drawing explaining the effect | action of this Embodiment Exploded perspective view showing an image blur correction device of another configuration

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Digital camera, 12 ... Camera body, 20A ... Correction lens, 30 ... Image blur correction apparatus, 32 ... Main body, 34 ... Holding frame, 36 ... X slider, 38 ... Y slider, 40 ... X motor, 42 ... Y motor 58 ... Coil, 58A ... Long side portion, 58B ... Short side portion, 60 ... Substrate, 61 ... Lens barrel, 62, 63 ... Terminal, 64, 65 ... Magnet, 66, 67 ... Yoke, 68, 69 ... Yoke portion

Claims (3)

A correction optical system for correcting blurring of an image formed by the imaging optical system;
A holding frame that holds the correction optical system and is movably supported in a plane perpendicular to the optical axis of the imaging optical system;
First and second sliders that are supported by the main body so as to be slidable in first and second directions orthogonal to the optical axis and engaged with the holding frame;
The coil comprises a coil, a magnet, and a yoke portion, and one of the coil and the magnet is supported by the first and second sliders, and the first and second sliders are respectively connected to the first and second sliders by energizing the coils. 1, first and second driving means for driving in the second direction,
The yoke portion is configured by containing a magnetic material in the lens barrel, the main body, or the first and second sliders of the imaging optical system, or by forming a surface layer of the magnetic material. An image blur correction device characterized by that.   The image blur correction apparatus according to claim 1, wherein the magnetic material is a soft magnetic material. An imaging optical system having bending means for bending the optical axis toward the imaging position;
The image blur correction device according to claim 1, wherein the image blur correction device is disposed on an optical axis bent by the bending means.
An imaging apparatus comprising:

Images