JP2007148022A - 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 and an imaging apparatus capable of preventing microvibration in driving. <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 X motor 40 has a coil 58 and a magnet 64, and the magnet 64 is arranged so that its N pole 64N becomes opposed to the long-side part 58A of the coil 58 and its S pole 64S becomes opposed to the remaining long-side part 58A and a pair of short-side parts 58B and 58B of the coil 58. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image blur correction apparatus and an imaging apparatus using the same, and more particularly to an image blur correction apparatus in a portable device such as a thin camera and an imaging apparatus using the same.

  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 coupling 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 the support frame of the correction lens slightly vibrates when the motor is driven. For this reason, there has been a problem that a new image blur due to a slight vibration occurs and the accuracy of the image blur correction is lowered.

  The inventor of the present invention investigated the minute vibration generated when the motor was driven, and found that there is a cause in the arrangement relationship between the motor coil and the magnet. That is, the coil is formed in a substantially frame shape comprising a pair of long shaft portions and a pair of short shaft portions by winding a conductor, but the polarity of the magnet arranged facing the pair of short shaft portions is We obtained the knowledge that micro-vibration is caused by the influence.

  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 prevent fine vibration during driving.

  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 that is movably supported in a plane orthogonal to the axis, and is slidably supported in different first and second directions perpendicular to the optical axis and engaged with the holding frame. One of the first and second sliders and one of the coil and the magnet are supported by the first and second sliders, respectively, and energizing the coil causes the first and second sliders to move to the first and second sliders, respectively. First and second driving means for driving in two directions, and the coil is formed in a substantially frame shape that is long in a direction orthogonal to the driving direction of the first and second driving means. A pair of short formed in the driving direction And a pair of long axis portions formed in the orthogonal direction, and the magnet has one of the N pole and the S pole opposed to one of the pair of long axis portions and the pair of short axis portions. In addition, the other of the N pole and the S pole is arranged to face the other of the pair of long axis portions.

  According to the first aspect of the present invention, since one of the N pole and the S pole of the magnet is disposed to face the pair of short shaft portions, forces in opposite directions act on the pair of short shaft portions. Accordingly, since the forces acting on the pair of short shaft portions are canceled out, only the force (that is, driving force) generated on the pair of long shaft portions acts on the first slider and the second slider. Accordingly, it is possible to prevent the occurrence of vibration due to the pair of short shaft portions, and it is possible to accurately drive the holding frame of the correction optical system in the first and second directions (that is, in the driving direction). .

  According to a second aspect of the present invention, in order to achieve the object, a correction optical system that corrects blurring of an image formed by the imaging optical system, the correction optical system, and a light of the imaging optical system A holding frame that is movably supported in a plane orthogonal to the axis, and is slidably supported in different first and second directions perpendicular to the optical axis and engaged with the holding frame. One of the first and second sliders and one of the coil and the magnet are supported by the first and second sliders, respectively, and energizing the coil causes the first and second sliders to move to the first and second sliders, respectively. First and second driving means for driving in two directions, and the coil is formed in a substantially frame shape that is long in a direction orthogonal to the driving direction of the first and second driving means. A pair of short formed in the driving direction And a pair of long shaft portions formed in the orthogonal direction, and the magnet has one of the N pole and S pole on one of the pair of long shaft portions and one of the pair of short shaft portions. The other of the N-pole and the S-pole is arranged to face the other of the pair of long axis portions and the other of the pair of short shaft portions.

  According to the invention of claim 2, since the N pole and the S pole of the magnet are respectively arranged to face the pair of short shaft portions, the force acts in the same direction at the pair of short shaft portions. This force is a direction orthogonal to the driving directions of the first and second driving means, and does not affect the driving force generated in the pair of long shaft portions. Therefore, it is possible to prevent the occurrence of vibration due to the pair of short shaft portions, and it is possible to accurately drive the holding frame of the correction optical system in the first and second directions.

  According to a third aspect of the present invention, in order to achieve the object, a correction optical system that corrects blurring of an image formed by the imaging optical system, the correction optical system, and the light of the imaging optical system A holding frame that is movably supported in a plane orthogonal to the axis, and is slidably supported in different first and second directions perpendicular to the optical axis and engaged with the holding frame. One of the first and second sliders and one of the coil and the magnet are supported by the first and second sliders, respectively, and energizing the coil causes the first and second sliders to move to the first and second sliders, respectively. First and second driving means for driving in two directions, and the coil is formed in a substantially frame shape that is long in a direction orthogonal to the driving direction of the first and second driving means. A pair of short formed in the driving direction And a pair of long shaft portions formed in the orthogonal direction, the magnet is disposed to face the pair of long shaft portions of the pair of long shaft portions and the pair of short shaft portions, Further, the N pole and the S pole are arranged so as to face the pair of long axis portions, respectively.

  According to the invention of claim 3, since the magnet is disposed so as to face only the pair of long shaft portions, there is no force acting on the pair of short shaft portions, and generation of vibration caused by the pair of short shaft portions is prevented. Can be prevented. Thereby, the holding frame of the correction optical system can be accurately driven in the first and second directions.

  In order to achieve the above-mentioned object, the invention according to claim 4 is disposed on the optical axis bent by the bending means and the imaging optical system provided with bending means for bending the optical axis toward the imaging position. An image blur correction apparatus according to any one of claims 1 to 3 is provided.

  According to the present invention, one of the N and S poles of the magnet is disposed so as to face the pair of short axis portions of the coil, or the N and S poles are respectively opposed to the pair of short shaft portions. Since the magnet is opposed to only the pair of long shaft portions, vibration can be prevented from being generated by the force acting on the pair of short shaft portions, and the holding frame of the correction optical system can be driven accurately.

  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 16, the second lens group 18, and the fourth lens group 22 constitute an imaging optical system, and the third lens group 20 is correction optics that corrects 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 inside (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.

  The guide bars 44 to 46 are inserted into the long holes 32A to 32C of the main body 32, respectively. 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 described above, a plate-like magnet 64 attached to the main body 32, and plate-like yokes 66 and 68. The magnet 64 is attached to the yoke 68 and attached to the main body 32 in a state of facing the coil 58. The yoke 66 is disposed on the opposite side of the magnet 64 with the coil 58 interposed therebetween, and is fixed to the main body 32.

  FIG. 11 is a front view of the coil 58, and FIG. 12 is a front view showing the relationship between the magnet 64 and the coil 58.

  As shown in FIG. 11, the coil 58 is formed in a rectangular frame shape long in the Z direction by winding a linear conductor, and a pair of long shaft portions 58A, 58A long in the Z direction, Short shaft portions 58B and 58B that are short in the X direction. A linear conductor is disposed along the Z direction in the long shaft portion 58A, and a linear conductor is disposed along the X direction in the short shaft portion 58B. Each long shaft portion 58A and each short shaft portion 58B are formed in a trapezoidal shape.

  As shown in FIG. 12, the N pole 64N of the magnet 64 is formed in substantially the same trapezoidal shape as the long shaft portion 58A, and is disposed at a position facing the long shaft portion 58A. The S pole 64S of the magnet 64 is disposed to face the remaining portion of the coil 58, that is, the other long shaft portion 58A and the pair of short shaft portions 58B and 58B.

  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 described above, a plate magnet 65 attached to the main body 32, and plate yokes 67 and 69. The magnet 65 is attached to the yoke 69 and attached to the main body 32 in a state of facing the coil 58. The yoke 67 is disposed on the opposite side of the magnet 65 with the coil 58 interposed therebetween, and is fixed to the main body 32.

  As with the magnet 64 described above, the N pole (not shown) of the magnet 65 is formed in the same trapezoid as the long shaft portion 58A of the coil 58, and is disposed to face the long shaft portion 58A. Further, the S pole (not shown) of the magnet 65 is disposed to face the other long axis portion 58A and the pair of short axis portions 58B, 58B of the coil 58.

  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 X slider 36, the Y slider 38, the X motor 40, and the Y motor 42 described above are collectively disposed on the subject side of the holding frame 34, and as shown in FIG. Built and unitized. Therefore, the image blur correction device 30 can be reduced in size and can be easily incorporated into the camera 10.

  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 a comparative example. FIG. 13 is a front view showing a magnet of a comparative example. The magnet 1 shown in the figure has its N pole 1N and S pole 1S separated in half at the position of the center line of the coil 58. Therefore, both the N pole 1N and the S pole 1S are arranged to face each short shaft portion 58B, 58B of the coil 58.

  When the motor composed of the magnet 1 and the coil 58 configured in this way is energized to the coil 58, a force in the driving direction acts on the long shaft portions 58A and 58A of the coil 58, while each short shaft portion 58B of the coil 58 is In 58B, forces act in different directions in the Z direction at a portion facing the N pole 1N and a portion facing the S pole 1S. Accordingly, in each of the short shaft portions 58B and 58B, the force acts in both the upward and downward directions in the Z direction and receives the force in the rotational direction, so that the entire coil 58 becomes unstable, and the X slider that supports the coil 58 This causes a problem that vibration is generated in 38.

  On the other hand, in the image blur correction apparatus according to the present embodiment, as shown in FIG. 12, the N pole 64N of the magnet 64 is arranged to face the long axis portion 58A of the coil 58, and the S pole 64S is arranged in the coil 58. The other long shaft portion 58A and the pair of short shaft portions 58B, 58B are disposed to face each other. When such a magnet 64 is used, only the S pole 64S is disposed opposite to each short shaft portion 58B, 58B. Therefore, each short shaft portion 58B, 58B has a single upward or downward Z direction. Only direction force works. Therefore, in the present embodiment, a stable force is applied to the coil 58, and the vibration of the X slider 38 can be prevented.

  Moreover, in this Embodiment, force generate | occur | produces in the reverse direction of a Z direction in the two short-axis parts 58B and 58B. Accordingly, since the forces acting on both the short shaft portions 58B and 58B are canceled out, only the force acting on the long shaft portions 58A and 58A, that is, the force in the driving direction acts on the coil 58 as a whole. Thereby, the vibration of the X slider 36 can be prevented, and the X slider 36 can be accurately moved in the X direction.

  Similarly, the same effect can be obtained when the Y motor 42 is driven. That is, in the present embodiment, the N pole of the magnet 65 is disposed to face the long axis portion 58A of the coil 58, and the S pole is the other long axis portion 58A of the coil 58 and a pair of short axis portions 58B, 58B. Since the coil 58 is applied with a force only in the driving direction, the vibration of the Y slider 38 can be suppressed, and the Y slider 38 can be accurately moved in the Y direction. .

  In the embodiment described above, the N pole 64N of the magnet 64 is opposed to the long axis portion 58A of the coil 58, and the S pole 64S is opposed to the other long axis portion 58A and the pair of short axis portions 58B and 58B. As shown in FIG. 14, the S pole 64S of the magnet 64 is opposed to one long shaft portion 58A of the coil 58, and the N pole 64N is the other long shaft portion 58A and a pair of short shaft portions 58B. You may comprise so that it may oppose 58B. Also in this case, since the force only in the driving direction acts on the coil 58, the X slider 36 can be accurately moved in the X direction.

  FIG. 15 is a front view showing a magnet having a configuration different from that of FIG. In the following embodiment, only the magnet of the X motor will be described. However, the present invention is not limited to this, and the Y motor may be configured similarly.

  In the magnet 100 shown in FIG. 15, the N pole 100N is disposed so as to face one long axis 58A and the short axis 58B of the coil 58, and the S pole 100S is arranged on the other long axis 58A of the coil 58 and the other short axis 58B. It arrange | positions facing the axial part 58B.

  When such a magnet 100 is used, a force acts on each short shaft portion 58B, 58B of the coil 58 only in one direction upward or downward in the Z direction. Since the direction of this force is a direction orthogonal to the drive direction (X direction), there is no possibility of adversely affecting the movement of the X slider 36 in the drive direction. Therefore, according to the present embodiment, vibration of the X slider 36 can be prevented, and the X slider 36 can be accurately moved in the X direction.

  FIG. 16 is a front view showing a magnet having a configuration different from that of FIG.

  In the magnet 102 shown in FIG. 16, the N pole 102N and the S pole 102S are formed in a trapezoid substantially the same as the long axis portion 58A of the coil 58. The N pole 102N is disposed to face one long axis portion 58A of the coil 58, and the S pole 102S is disposed to face the other long axis portion 58A. That is, the N pole 102N and the S pole 102S of the magnet 102 are arranged to face only the long shaft portions 58A and 58A of the coil 58.

  When such a magnet 102 is used, a force is applied only to the long shaft portions 58A and 58A of the coil 58, so there is no possibility of vibration of the X slider 36, and the X slider 36 can be moved in the X direction with high accuracy. it can.

  FIG. 17 is a front view showing a magnet having a configuration different from that of FIG.

  A magnet 104 shown in FIG. 17 has an N pole 104N and an S pole 104S formed in a rectangular shape. The N pole 104N is arranged to face a part of one long axis part 58A, and the S pole 104S is arranged to face a part of the other long axis part 58A. Therefore, the N pole 104N and the S pole 104S of the magnet 104 are arranged to face only the long shaft portions 58A and 58A of the coil 58.

  When such a magnet 104 is used, as in the case of the magnet 102 of FIG. 16, since the force acts only on the long shaft portions 58A and 58A of the coil 58, there is no possibility that the X slider 36 will vibrate. 36 can be accurately moved in the X direction.

  In the above-described embodiment, the coil 58 is formed in a substantially rectangular frame shape, but the shape of the coil 58 is not limited to this, and may be any shape that is long in the direction orthogonal to the driving direction. For example, as shown in FIG. 18, the coil 106 may be formed in an oval shape. In this case, the long axis portions 106A and 106A of the coil 106 are portions where linear conductors are linearly arranged in the Z direction, and the short axis portions 106B and 106B are linear conductors arranged circumferentially. It becomes the part which was done.

  Even when such a coil 106 is used, a magnet (not shown) may be configured as in the above-described embodiment. (1) One of the N and S poles of the magnet is opposed to the long axis portion 106A of the coil 106, and the other of the N and S poles of the magnet is connected to the remaining long axis portion 106A and the short axis portions 106B and 106B. (2) The N pole of the magnet is opposed to one long axis portion 106A and one short axis portion 106B, and the S pole is opposed to the other long axis portion 106A and the other short axis portion 106B. ) It is preferable to select the N pole and S pole of the magnet from facing the long axis portions 106A and 106A of the coil 106, respectively. Thereby, it is possible to prevent the X slider 36 from vibrating due to the force acting on the short shaft portions 106B and 106B of the coil 106.

  In the present invention, the configuration of the motor coil and the magnet only needs to satisfy the above-described relationship, and the configuration of the image blur correction device is not limited to the above-described embodiment. Therefore, for example, an image blur correction apparatus may be configured as shown in FIG.

  19 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.

  11 are shock absorbing members made of an impact absorbing material such as rubber or urethane resin, and are formed in a cylindrical shape and inserted into the P guide rods 77 and 79 and the Y guide rods 78 and 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. 11 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 85, and a disk type yoke 86. Similarly, the second motor 75 includes a substrate 83, a magnet 87, a yoke 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 73 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 respectively fixed on the yokes 85 and 88 and are disposed so as to face the substrates 83 and 83 by being attached to the lens barrel 76. Further, the magnets 84 and 87 are, as in the above-described embodiment, (1) one of the N pole and the S pole of the magnets 84 and 87 is opposed to the long shaft portion 90A of the coil 90, and the N of the magnets 84 and 87 The other of the pole and the S pole is opposed to the remaining long shaft portion 90A and the short shaft portions 90B and 90B. (2) The N pole of the magnets 84 and 87 is opposed to one long shaft portion 90A and one short shaft portion 90B. (3) The N pole and S pole of the magnets 84 and 87 are respectively connected to the long axis portions 90A and 90A of the coil 90. The S pole is opposed to the other long axis portion 90A and the other short axis portion 90B. It is comprised so that either may be made to oppose.

  Also in the case of the image blur correction device 70 configured as described above, it is possible to prevent the first slider 72 and the second slider 73 from vibrating due to the force acting on the short shaft portion 90B of the coil 90, and the holding frame 71. Can be moved with high accuracy.

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 Front view showing coil shape Front view showing the shape of the magnet Front view showing shape of magnet of comparative example The front view which shows the magnet of a structure different from FIG. The front view which shows the magnet of a structure different from FIG. The front view which shows the magnet of a structure different from FIG. The front view which shows the magnet of a structure different from FIG. The front view which shows the coil of a shape different from FIG. 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 shaft portion, 58B ... Short shaft portion, 60 ... Substrate, 62, 63 ... Terminal, 64, 65 ... Magnet, 66-69 ... Yoke

Claims (4)

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 orthogonal to the optical axis and slidably supported in different first and second directions, respectively, and engaged with the holding frame;
One of a coil and a magnet is supported by the first and second sliders respectively, and the first and second sliders are driven in the first and second directions by energizing the coils, respectively. Second driving means,
The coil is formed in a substantially frame shape that is long in a direction orthogonal to the drive direction of the first and second drive means, and thus is formed in a pair of short shaft portions formed in the drive direction and in the orthogonal direction. A pair of long shaft portions,
In the magnet, one of the N pole and the S pole faces one of the pair of long axis portions and the pair of short shaft portions, and the other of the N pole and the S pole is the pair of long axis portions. An image blur correction device characterized by being disposed opposite to the other. 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 orthogonal to the optical axis and slidably supported in different first and second directions, respectively, and engaged with the holding frame;
One of a coil and a magnet is supported by the first and second sliders respectively, and the first and second sliders are driven in the first and second directions by energizing the coils, respectively. Second driving means,
The coil is formed in a substantially frame shape that is long in a direction orthogonal to the drive direction of the first and second drive means, and thus is formed in a pair of short shaft portions formed in the drive direction and in the orthogonal direction. A pair of long shaft portions,
In the magnet, one of the N pole and S pole faces one of the pair of long axis portions and one of the pair of short shaft portions, and the other of the N pole and S pole is the pair of long axes. An image blur correction apparatus, wherein the image blur correction apparatus is disposed opposite to the other of the pair and the other of the pair of short shaft portions. 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 orthogonal to the optical axis and slidably supported in different first and second directions, respectively, and engaged with the holding frame;
One of a coil and a magnet is supported by the first and second sliders respectively, and the first and second sliders are driven in the first and second directions by energizing the coils, respectively. Second driving means,
The coil is formed in a substantially frame shape that is long in a direction orthogonal to the drive direction of the first and second drive means, and thus is formed in a pair of short shaft portions formed in the drive direction and in the orthogonal direction. A pair of long shaft portions,
The magnet is disposed so as to face the pair of long shaft portions of the pair of long shaft portions and the pair of short shaft portions, and the N pole and the S pole respectively face the pair of long shaft portions. An image blur correction device characterized by being arranged as described above. An imaging optical system having bending means for bending the optical axis toward the imaging position;
An image blur correction apparatus according to claim 1, wherein the image blur correction apparatus is disposed on an optical axis bent by the bending means.

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