JP2018018055A - Image tremor correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image tremor correction device that secures high accuracy of position detection, and achieve miniaturization.SOLUTION: An image tremor correction device 50, which has: a movable part 51 including an image pik-up element or an imaging lens 27; and a VCM drive unit driving the movable part with respect to a stationary part 61 by using a coil 52, and drive-purpose magnets 71 and 72, comprises: a position detection element 53 that is arranged in one of the movable part or the stationary part; and a pair of position detection-purpose magnets 62 and 63 that is arranged at a position opposing the position detection element, and is arranged in other of the movable part or the stationary part. The pair of position detection-purpose magnets is a first magnet and second magnet that are arranged so that a different magnetic pole opposes with respect to a surface of the position detection element, in which the first magnet and second magnet are arranged in order along a direction separating from an optical axis serving as a light flux of light to be incident upon the image pick-up element or the imaging lens, and a magnitude of magnetic flux density reaching the surface of the position detection element from each of the first magnet and the second magnet is different.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical image blur correction apparatus that is mounted on a lens barrel mounted on an imaging apparatus or the like and is configured using a voice coil type actuator.

  Conventionally, an optical image formed by an imaging optical system is sequentially converted into an image signal by using a photoelectric conversion element or the like (hereinafter referred to as an imaging element), and the obtained image signal is recorded as image data in a predetermined form. An image pickup apparatus, for example, a digital camera, which includes an image display device such as a liquid crystal display device (LCD) and an organic EL display device which can be recorded on a medium and reproduces and displays image data recorded on the recording medium as an image. And video cameras are generally put into practical use and are widely used.

  In this type of conventional imaging apparatus, when the apparatus is held and used by hand, a minute movement (so-called camera shake or the like) of the imaging apparatus resulting from unstable holding of the apparatus is detected, and this is detected. In the direction that cancels out the image, a part of the optical member of the imaging optical system is moved on the plane substantially orthogonal to the optical axis (in the shift direction), or two axes orthogonal to the optical axis of the imaging optical system (the X axis and Various types of so-called optical image blur correction devices configured to enable rotation in the pitch direction and the yaw direction around each of the Y-axis) have been proposed and put into practical use.

  As drive means in this type of image blur correction apparatus, for example, those using, for example, a voice coil type magnetic actuator (voice coil motor; VCM), a vibration type linear actuator, or the like have been put into practical use. .

  Further, in this type of image shake correction apparatus, in order to perform control for moving some optical members of the imaging optical system, a position for detecting the position of the movable frame member that holds the optical member that is moved during image shake correction. In general, a detection means is provided. In this case, the position detection means includes, for example, an optical position detection unit configured to include a light projecting member and a light receiving member, and a member that generates magnetism (such as a magnet) and a magnetic detection member. There are magnetic detection type position detection units.

  For example, in a conventional image blur correction apparatus disclosed in Japanese Patent Application Laid-Open No. 7-5515, etc., a driving unit composed of a coil, a yoke, a magnet, and the like, and a position detection unit composed of a light projecting element, a light receiving element, etc. It is configured. In this image blur correction apparatus, the driving unit and the position detecting unit are arranged at positions separated from each other.

Japanese Patent Application Laid-Open No. 7-5515

  However, in the conventional image blur correction apparatus disclosed in Japanese Patent Laid-Open No. 7-5515, since the driving means and the position detection means are arranged at positions separated from each other, the size of the apparatus itself is increased. In addition, there is a problem that there is a limit to downsizing the device itself only by means of arrangement of members.

  In particular, in an image shake correction apparatus having a general configuration, when a magnetic actuator is used as a drive unit and a magnetic detection type position detection unit is used as a position detection unit, the magnetism generated from the drive unit is detected. May affect the means. Therefore, there is a possibility that necessary position detection accuracy cannot be obtained. In view of this, in order to prevent the position detection means from being affected by the magnetic force of the drive means, it is desirable to arrange the drive means and the position detection means at positions as far apart as possible. However, when such a layout is adopted, there is a problem that downsizing of the apparatus is hindered as described above.

  The present invention has been made in view of the above-described points, and an object of the present invention is to drive the movable portion with respect to the fixed portion using a movable portion having an imaging lens, and a coil and a driving magnet. An image shake correction apparatus having a VCM driving unit (driving means using a magnetic actuator), and having a structure capable of realizing downsizing while ensuring high position detection accuracy while using a magnetic detection type position detecting means. An image blur correction apparatus is provided.

  In order to achieve the above object, an image shake correction apparatus according to one embodiment of the present invention drives a movable unit with respect to a fixed unit by using a movable unit having an imaging element or an imaging lens, a coil, and a driving magnet. An image blur correction device having a VCM driving unit, a position detection element disposed on one of the movable unit or the fixed unit, and a position opposite to the position detection element, the movable unit Or a pair of position detection magnets disposed on the other of the fixed portions, and the pair of position detection magnets are disposed such that different magnetic poles face the surface of the position detection element. A first magnet and a second magnet, wherein the first magnet and the second magnet are in order along a direction away from an optical axis which is a center of a light beam incident on the imaging element or the imaging lens. Placed in Magnitude of the magnetic flux density reaching the respective serial first magnet and the second magnet on the surface of the position detecting device is different.

  According to the present invention, an image shake correction apparatus having a movable part having an imaging lens and a VCM driving part (driving means using a magnetic actuator) that drives the movable part with respect to the fixed part using a coil and a driving magnet. Thus, it is possible to provide an image shake correction device having a structure that can achieve downsizing while ensuring high position detection accuracy while using a magnetic detection type position detection means.

1 is an external perspective view showing an imaging apparatus that can be mounted with a lens barrel on which an image shake correction apparatus according to an embodiment of the present invention is mounted. The conceptual diagram which shows the outline of the internal structure of the lens barrel attached to this which shows the longitudinal cross-section cut | disconnected in the cut surface shown by the code | symbol [2] of FIG. 1 is an external perspective view of an image shake correction apparatus according to an embodiment of the present invention. Three views of a movable part (front view, right side view, bottom view) of an image shake correction apparatus according to an embodiment of the present invention. 1 is a rear view of a movable portion of an image shake correction apparatus according to an embodiment of the present invention. Three views (front view, right side view, bottom view) of a fixed portion of an image shake correction apparatus according to an embodiment of the present invention. 1 is a front view of an image shake correction apparatus according to an embodiment of the present invention (a state in which a magnetic circuit unit is removed from the image shake correction apparatus). FIG. 7 is a front view and a right side view of an image shake correction apparatus according to an embodiment of the present invention (a state in which a magnetic circuit unit is incorporated from the state of FIG. 7). Sectional drawing which follows the [9]-[9] line of FIG. FIG. 2 is an exploded perspective view of a main part showing a magnetic circuit unit and a position detection unit in the image shake correction apparatus according to the embodiment of the present invention. In the embodiment of the present invention and the image blur correction device of the conventional configuration, a graph comparing the change of the magnetic flux entering each Hall element with respect to the moving distance of the movable part. The principal part expanded sectional view which shows the 1st modification of the image blur correction apparatus of one Embodiment of this invention. The principal part expanded sectional view which shows the 2nd modification of the image blurring correction apparatus of one Embodiment of this invention. The principal part expanded sectional view which shows the 3rd modification of the image blur correction apparatus of one Embodiment of this invention. The principal part expanded sectional view which shows the 4th modification of the image blur correction apparatus of one Embodiment of this invention. The principal part expanded sectional view which shows the 5th modification of the image blur correction apparatus of one Embodiment of this invention. The principal part expanded sectional view which shows the 6th modification of the image blur correction apparatus of one Embodiment of this invention.

  The present invention will be described below with reference to the illustrated embodiments.

[One Embodiment]
In one embodiment of the present invention, for example, an optical image formed by an imaging optical system including a plurality of optical members (imaging lenses) or the like is photoelectrically converted using a solid-state imaging device or the like, and an image signal obtained thereby is stationary. Digital image data representing an image or a moving image is converted, the digital image data generated thereby is recorded on a recording medium, and a still image or a moving image is displayed on a display device based on the digital image data recorded on the recording medium. 3 is an illustration of an image blur correction device mounted on a lens barrel of an imaging device configured to be able to perform reproduction display.

  In the present embodiment, the optical axis of the imaging optical system in the lens barrel is denoted by reference symbol O. Then, in the direction along the optical axis O, the side with the subject facing the front surface of the imaging device is referred to as the front side, and the side with the light receiving surface (imaging surface) of the imaging device disposed on the back side of the imaging device. Is the rear. In the plane orthogonal to the optical axis O, the left-right direction from the subject side toward the front of the imaging apparatus, that is, the horizontal direction is referred to as the X direction. An up-down direction (vertical direction), that is, a direction perpendicular to the X direction is referred to as a Y direction. A direction along the optical axis O is referred to as a Z direction.

  Each drawing used in the following description is schematically shown. In order to show each component in a size that can be recognized on the drawing, the dimensional relationship and scale of each member are shown for each component. May be shown differently. Therefore, the present invention is only in the illustrated form with respect to the quantity of each component described in each drawing, the shape of each component, the ratio of the size of each component, the relative positional relationship of each component, and the like. It is not limited.

  FIG. 1 is an external perspective view showing an imaging apparatus capable of mounting a lens barrel on which an image shake correction apparatus according to an embodiment of the present invention is mounted. FIG. 2 is a conceptual view showing a vertical cross section of the imaging device of FIG. 1 cut along the cutting plane indicated by reference numeral [2] in FIG. 1, and showing an outline of the internal structure of the imaging device and a lens barrel attached to the imaging device. It is. In FIG. 2, in order to avoid complication of the drawing, illustration of components not directly related to the present invention is omitted, and the internal configuration is simplified. 1 and 2 illustrate different types of lens barrels.

  That is, the imaging device 1 shown in FIG. 1 and FIG. 2 uses one of a plurality of different types of lens barrels (reference numeral 30 in FIG. 1, reference numeral 30A in FIG. 2, etc.) for a common apparatus main body 10. This is a so-called interchangeable lens type imaging device configured to be selectively mounted.

  Each of the lens barrels (30, 30A) shown in FIGS. 1 and 2 may be considered to be equipped with an image blur correction device 50 (details will be described later) of this embodiment. In the following description of the present embodiment, the image blur correction device 50 (see FIG. 2) mounted on the lens barrel 30A shown in FIG. 2 is exemplified.

  First, before describing the detailed configuration of the image shake correction apparatus 50 according to an embodiment of the present invention, the schematic configuration of the imaging apparatus 1 including the lens barrel 30A on which the image shake correction apparatus 50 is mounted will be described with reference to FIG. This will be described below with reference to FIG.

  As shown in FIGS. 1 and 2, the imaging device 1 includes a device body 10 and lens barrels (30, 30A). Among these, the apparatus main body 10 includes a housing that houses various components constituting the imaging device 1 and a plurality of operation members that are respectively disposed at predetermined positions on the outer surface of the housing. Configured.

  Examples of the various constituent units housed in the housing of the apparatus main body 10 include an image sensor 11 (not shown in FIG. 1; see FIG. 2), a finder device, a shutter mechanism, There are a plurality of electric boards and the like. Here, as the imaging device 11, for example, a CCD image sensor using a CCD (Charge Coupled Device), a MOS type image sensor using a complementary metal oxide semiconductor (CMOS), or the like. Applies.

  Although the shutter mechanism is not shown, for example, a focal plane type shutter mechanism provided on the front side of the light receiving surface of the image sensor 11 is applied. The shutter mechanism may be a so-called lens shutter mechanism or the like that is disposed in the lens barrel 30 in addition to the one disposed in the apparatus main body 10.

  As another component unit included in the apparatus main body 10, a display device (not shown) is disposed on the back side of the casing. The display device displays an image based on image data acquired by the image sensor 11 or image data recorded on a recording medium (not shown), and displays a selection display screen for performing various settings. And so on.

  Further, as the plurality of operation members provided outside the casing, as shown in FIG. 1, for example, a push-type operation member 14 for performing shutter release, setting change, etc., setting switching operation, mode selection operation, etc. In addition to the rotary operation member 15 for performing the operation, the lever operation member 16 for performing on / off operation of the power source, and the like, there are a slide operation member for performing other operations.

  On the other hand, the lens barrel (30, 30A) provided in the imaging apparatus 1 is formed, for example, in a cylindrical shape as a whole and includes a plurality of imaging lens groups (21-29; see FIG. 2) that are a plurality of optical members inside. ) And the like, a plurality of lens holding members (not shown) for holding each of a plurality of imaging lens groups constituting the imaging optical system, a predetermined imaging lens group (reference numeral 25), and this In addition to a unit including a holding member (not shown) and a drive mechanism (not shown) for moving the unit forward and backward in the direction along the optical axis O, etc., the image blur correction of the present embodiment The apparatus 50 (refer FIG. 2) etc. is comprised.

  The lens barrel (30, 30A) is disposed on the front side of the apparatus main body 10. In this case, the lens barrel (30, 30A) may be fixed to the apparatus main body 10 or may be detachable from the apparatus main body 10.

  Here, when the lens barrel (30, 30A) is disposed on the front surface of the apparatus body 10, the optical image formed by the imaging optical system of the lens barrel (30, 30A) is the apparatus body. 10 is configured to form an image on the light receiving surface of the image sensor 11 in the image sensor 10. For this purpose, the lens barrel (30, 30A) with respect to the apparatus main body 10 is set so that the optical axis O of the imaging optical system of the lens barrel (30, 30A) and the substantially central portion of the light receiving surface of the imaging element 11 substantially coincide. ) Is specified.

  The image blur correction device 50 according to the present embodiment is a seventh lens group 27 that is a predetermined imaging lens among a plurality of imaging lens groups (21 to 29) constituting the imaging optical system in the lens barrel 30A shown in FIG. A lens holding frame (not shown in FIG. 2) is provided. Then, the image blur correction apparatus 50 moves the movable part 51 including the seventh lens holding frame that holds the seventh lens group 27 in a plane orthogonal to the optical axis O to perform image blur correction. It is a solid (unit) (details will be described later).

  The other configuration of the imaging apparatus 1 itself is assumed to have substantially the same configuration as the conventional imaging apparatus of the same form, and further detailed description is omitted.

  Next, a detailed configuration of the image blur correction device 50 of the present embodiment will be described below with reference to FIGS.

  FIG. 3 is an external perspective view of the image blur correction apparatus according to the embodiment of the present invention. FIG. 4 is a three-view diagram (a front view, a right side view, and a bottom view) of the movable portion of the image shake correction apparatus of the present embodiment. FIG. 5 is a rear view of the movable portion of the image shake correction apparatus of the present embodiment. FIG. 6 is a three-view diagram (a front view, a right side view, and a bottom view) of the fixed portion of the image shake correction apparatus of the present embodiment. FIG. 7 is a front view of the image blur correction apparatus of the present embodiment. FIG. 7 shows a state where the magnetic circuit unit is removed from the image blur correction device. FIG. 8 is a front view and a right side view of the image shake correction apparatus of the present embodiment. FIG. 8 shows a state in which the magnetic circuit unit is assembled from the state of FIG. 9 is a cross-sectional view taken along the line [9]-[9] in FIG. FIG. 10 is an essential part exploded perspective view showing the magnetic circuit unit and the position detection unit in the image shake correction apparatus of this embodiment.

  As described above, the image blur correction device 50 according to the embodiment of the present invention moves the movable portion 51 including the seventh lens holding frame that holds the seventh lens group 27 in a plane orthogonal to the optical axis O. This is an assembly (unit) that performs image blur correction.

  As shown in FIG. 3 and the like, the image shake correction apparatus 50 according to the present embodiment includes a movable part 51, a fixed part 61, a VCM driving part (a driving means using a magnetic actuator) including a magnetic circuit unit 70, a flexible part. It is mainly composed of a printed circuit board 59 and the like.

  The movable portion 51 is a component including a seventh lens holding frame that holds the seventh lens group 27 among the plurality of image pickup lens groups (21 to 29) constituting the image pickup optical system in the lens barrel 30A. .

  The movable portion 51 is held inside the fixed portion 61 so as to move relative to the fixed portion 61 in a plane perpendicular to the optical axis O of the light incident on the optical member (seventh lens group 27). It is configured. With this configuration, the image blur correction device 50 according to the present embodiment performs control to drive the movable portion 51 in the direction in which image blur is canceled with respect to the fixed portion 61 based on a predetermined image blur correction signal. This is to obtain a shake correction effect. The basic configuration for this is substantially the same as that in a conventional image blur correction apparatus. Below, the structure of the movable part 51 is demonstrated easily.

  As shown mainly in FIGS. 4, 5, etc., the movable portion 51 is disposed at a movable portion main body 55 that is a basic component and a seventh lens holding frame, and a predetermined portion on the movable portion main body 55. A plurality of constituent members, that is, a plurality of driving coils 52, a Hall element (53x, 53y; details will be described later), a seventh lens group 27, and the like.

  The movable part main body 55 is formed of an annular flat plate member as a whole, and an opening 55a is formed at a substantially central portion. A seventh lens group 27 that is a part of an optical member constituting the imaging optical system is fixed to the opening 55a.

  On one surface (front side) in the vicinity of the outer peripheral edge of the movable portion main body 55, a plurality (four) of driving coils 52 for driving the movable portion 51 and the optical axis O of the movable portion 51 are centered. The hall elements (53x, 53y), which are a plurality of (two) position detection elements that constitute a part of the position detection unit that is a position detection means for detecting the position in the XY direction, are respectively predetermined portions. It is arranged.

  The four drive coils 52 are arranged at intervals of 90 degrees in the radial direction around the optical axis O so as to surround the opening 55a (that is, the seventh lens group 27) of the movable portion main body 55. Has been. At this time, the air-core portion of each driving coil 52 is arranged so as to face the direction orthogonal to the optical axis O. Each of the drive coils 52 includes a plurality of drive magnets 71 and 72 included in a magnetic circuit unit 70 (details will be described later) provided in the fixed portion 61 when the image shake correction apparatus 50 is assembled. And is fixed to the movable portion main body 55.

  In each driving coil 52, coils facing each other across the opening 55a are connected in series via a flexible printed circuit board 59 (see FIG. 3).

  A plurality of (two) Hall elements (53x, 53y) for position detection are arranged at predetermined positions of the fixed portion 61, and a plurality of positions constituting the other part of the position detection unit as position detection means. They are arranged at positions facing the position detection magnets (62x, 63x, 62y, 63y), respectively (details will be described later).

  That is, the plurality of Hall elements (53x, 53y) and the plurality of position detection magnets (62x, 63x, 62y, 63y) constitute a magnetic detection type position detection unit.

  In this case, the position detection unit 80x in the X direction (see FIG. 9) includes one Hall element 53x and a pair of position detection magnets 62x and 63x. Similarly, the position detection unit in the Y direction includes a single hall element 53y and a pair of position detection magnets 62y and 63y.

  Here, the Hall element 53x is a position detection element that detects the position of the movable portion 51 in the X direction within a plane orthogonal to the optical axis O. The Hall element 53y is a position detection element that detects the position of the movable portion 51 in the Y direction within a plane orthogonal to the optical axis O. In this case, the reference position of the movable portion 51 is, for example, a position based on the optical axis O.

  Power supply to each Hall element (53x, 53y) and signal output are performed via the flexible printed circuit board 59 (see FIG. 3). Each Hall element (53x, 53y) is arranged so as to be in a direction in which the strength of magnetic flux in the Z direction, that is, the direction along the optical axis O can be detected.

  A plurality (three) of ball receiving surfaces 54 are formed on a predetermined portion of the peripheral region of the opening 55a on the back surface (surface opposite to the coil arrangement surface) of the movable portion main body 55. Yes. The ball receiving surface 54 is a flat surface portion for receiving the balls 66 respectively disposed on a plurality (three) of the ball receiving portions 64 of the fixing portion 61. In the present embodiment, an example is shown in which three ball receiving surfaces 54 are formed on the back surface of the movable portion main body 55 at intervals of about 120 degrees in the circumferential direction.

  For example, a coiled and contractive biasing spring (not shown) is stretched between the movable portion main body 55 and the fixed portion main body 65 (described later). Three urging springs are formed at intervals of approximately 120 degrees in the circumferential direction of the movable portion main body 55. With this configuration, the movable portion main body 55 is biased to the fixed portion main body 65 via the balls 66. Therefore, the movable part main body 55 is configured to be able to move smoothly with respect to the fixed part main body 65 within a predetermined plane (in a plane orthogonal to the optical axis O).

  Next, the fixed portion 61 is a structural unit that houses the movable portion 51 in a movable state in a plane orthogonal to the optical axis O, mainly as shown in FIG. For this purpose, the basic configuration of the fixing unit 61 is substantially the same as that in the conventional image blur correction apparatus. Below, the structure of the fixing | fixed part 61 is demonstrated easily.

  The fixed portion 61 includes a fixed portion main body 65 serving as a basic component, and a plurality of (four) components including a plurality of constituent members disposed at predetermined portions on the fixed portion main body 65, that is, driving magnets 71 and 72. The magnetic circuit unit 70, the ball 66, and the like.

  The fixed portion main body 65 is a casing constituted by an annular flat plate portion 65b having an opening 65a formed at a substantially central portion and a cylindrical portion 65c formed so as to surround the outer peripheral edge of the flat plate portion 65b. Is a unit. As described above, the movable portion main body 55 is accommodated and disposed in the fixed portion main body 65 so as to be movable in a predetermined direction.

  A plurality of notches 65d for mounting a magnetic circuit unit 70 (details will be described later) are formed in the cylindrical portion 65c of the fixed portion main body 65. Four cutouts 65d are formed around the optical axis O at intervals of 90 degrees in the circumferential direction of the cylindrical portion 65c.

  When the movable part 51 is housed and arranged inside the fixed part main body 65, the seventh lens group 27 is arranged to face the opening 65a. At this time, the arrangement of the movable portion 51 with respect to the fixed portion 61 is set so that the optical axis O of the seventh lens group 27 passes through the approximate center point of the opening 65a. That is, the opening 65a is an opening through which the light beam transmitted through the seventh lens group 27 passes.

  In addition, a plurality (three) of ball receiving portions 64 are formed on one surface (front side; a surface facing the movable portion main body 55) of the flat plate portion 65b of the fixed portion main body 65. In this embodiment, three ball receiving portions 64 are formed in the flat plate portion 65b of the fixed portion main body 65 at intervals of about 120 degrees in the circumferential direction (see FIG. 6).

  A ball 66 is accommodated in the ball receiving portion 64. Here, for example, a hard sphere using a metal such as a steel ball or a ceramic ball is applied to the ball 66. Further, the depth dimension of the ball receiving portion 64 is set to be at least smaller than the diameter of the ball 66. In other words, when the ball 66 is stored inside the ball receiving portion 64, a part of the ball 66 protrudes from the upper surface of the ball receiving portion 64.

  Further, in the flat plate portion 65b of the fixed portion main body 65, a plurality of position detecting magnets are arranged on each predetermined portion on the same surface as the surface on which the ball receiving portion 64 is disposed.

  In the present embodiment, the plurality of position detection magnets include a pair of position detection magnets 62x and 63x corresponding to the hall element 53x for position detection in the X direction and a hall element 53y for position detection in the Y direction. There is a corresponding pair of position detection magnets 62y, 63y.

  Here, the pair of position detecting magnets 62x and 63x in the X direction are arranged at positions facing the hall element 53x in the X direction when the movable part 51 and the fixed part 61 are assembled in a normal state. Is done. The pair of position detection magnets 62x and 63x are arranged such that different magnetic poles face the surface of the Hall element 53x. The pair of position detection magnets 62x and 63x are arranged in the radial direction in order along the direction away from the optical axis O. Among these, the position detecting magnet 62x disposed on the outer peripheral side is referred to as a first position detecting magnet (first magnet), and the position detecting magnet 63x disposed on the inner peripheral side is referred to as the second. It is assumed to be a position detection magnet (second magnet). Therefore, the pair of position detection magnets 62x (first magnet) and 63x (second magnet) are arranged in order along the direction away from the optical axis O.

  Similarly, the pair of position detecting magnets 62y and 63y in the Y direction are also arranged in the radial direction. That is, the position detection magnet 62y disposed on the outer peripheral side is referred to as a first position detection magnet (first magnet), and the position detection magnet 63y disposed on the inner peripheral side is a second position detection. This is called a magnet for use (second magnet).

  And the magnitude | sizes of the magnetic flux density which reaches | attains the surface of each Hall element (53x, 53y) from each of the 1st position detection magnet (62x, 62y) and the 2nd position detection magnet (63x, 63y) differ. It is configured as follows.

  For example, the second position detection magnets 63x and 63y disposed on the inner peripheral side are those having a larger magnetic force than the first position detection magnets 62x and 62y disposed on the outer peripheral side. This is due to the following reasons.

  That is, the first position detection magnets 62x and 62y arranged on the outer peripheral side of the pair of position detection magnets 62x and 63x and the pair of position detection magnets 62y and 63y are arranged on the inner peripheral side. The provided second position detection magnets 63x and 63y have a magnetic pole direction that is canceled out by the magnetic force (magnetic flux density) of the drive magnets 71 and 72 included in the magnetic circuit unit 70. In consideration of this, in the image blur correction device 50 of the present embodiment, the second position detection magnets (63x, 63y) in the direction of the magnetic poles canceled by the magnetic force of the drive magnets 71, 72 are used. A thing with a large magnetic force is used. With this configuration, the influence of the magnetic force from the drive magnets 71 and 72 is canceled out to ensure higher position detection accuracy (details will be described later).

  Further, for example, the first position detection magnets 62x and 62y and the second position detection magnets 63x and 63y are both formed in a rectangular parallelepiped shape and differ only in the length along the optical axis O. Used. In this case, the first position detection magnets 62x and 62y are shorter in length along the optical axis O than the second position detection magnets 63x and 63y.

In other words,
The length in the optical axis direction of the first position detection magnets 62x, 62y is denoted by H1,
In the case where the length in the optical axis direction of the second position detection magnets 63x and 63y is H2 (see FIG. 9),
H1 <H2
It is comprised so that. In this case,
H2 / H1 = H
When
1 <H ≦ 2
It is desirable to set so that

  On the other hand, the magnetic circuit unit 70 is disposed in each of the plurality of (four places) notches 65d so as to be inserted in the direction indicated by the arrow S in FIG. In this state, the magnetic circuit unit 70 is bonded and fixed to the fixed portion main body 65 of the fixed portion 61.

  The magnetic circuit unit 70 is mainly composed of a plurality (two) of driving magnets 71 and 72 and a plurality (three) of yokes 73, 74, and 75, as mainly shown in FIGS. Has been. Here, one of the two drive magnets 71 and 72 is referred to as a first drive magnet 71, and the other is referred to as a second drive magnet 72. The plurality of (three) yokes 73, 74, and 75 are all magnetic materials. Of these, the yoke 73 is referred to as a first magnetic body, the yoke 74 is referred to as a second magnetic body, and the yoke 75 is referred to as a third magnetic body.

  These magnets 71 and 72 and yokes 73, 74, and 75 are assembled by being combined alternately. Thereby, as shown in FIG. 9, the cross section is formed so as to be substantially E-shaped as a whole. Specifically, for example, the two drive magnets 71 and 72 are disposed with one end of the first yoke 73 interposed therebetween. At this time, the magnetic poles of the two drive magnets 71 and 72 are arranged so that the same magnetic poles face each other with the first yoke 73 interposed therebetween. One surface of the first magnet 71 is disposed at one end of the second yoke 74, and one surface of the second magnet 72 is disposed at one end of the third yoke 75. As described above, the magnetic circuit unit 70 assembled in this way is inserted into the notch 65d of the fixing portion main body 65 in the direction of arrow S in FIG. Then, when each magnetic circuit unit 70 is assembled in a normal state with the fixed portion 61 disposed in each notch 65d and the movable portion 51, each of the driving coils 52 of the movable portion 51 is respectively The magnetic circuit units 70 are arranged so as to face each other (see FIG. 9). At this time, the first yoke 73 in the magnetic circuit unit 70 is inserted so as to penetrate the air core portion 52 a (see FIG. 9) of the driving coil 52 of the movable portion 51.

  The four driving coils 52 and the four magnetic circuit units 70 are used for performing image blur correction driving by driving the movable portion 51 with respect to the fixed portion 61 in the image blur correction device 50 of the present embodiment. A VCM driving unit is configured.

  Other configurations of the image blur correction device 50 of the present embodiment configured as described above are substantially the same as those in the conventional image blur correction device.

  In the image blur correction device 50 of the present embodiment configured as described above, as described above, and particularly as shown in FIG. 9 and the like, two driving magnets included in the magnetic circuit unit 70 of the VCM driving unit. (71, 72) and a plurality of position detection magnets (62x, 63x, 62y, 63y) are arranged at close positions.

  More specifically, for example, in the example shown in FIG. 9, a pair of position detection magnets 62x and 63x corresponding to the Hall element 53x for position detection in the X direction, and two drive circuits included in the magnetic circuit unit 70 are used. The magnets 71 and 72 are disposed at close positions. The positional relationship between the pair of position detection magnets 62y and 63y corresponding to the Y-direction position detection Hall element 53y and the two drive magnets 71 and 72 of the magnetic circuit unit 70 is also substantially the same (FIG. See 8).

  When such a configuration is adopted, the magnetic force of the drive magnets 71 and 72 leaks to the outside through, for example, the air core portion 52a of the drive coil 52, so that a pair of position detection sensors arranged in the vicinity thereof. The magnets (62x, 63x and 62y, 63y) may be affected (see FIG. 9). In this case, the magnetic force leaking from the part is the direction of the pair of position detection magnets (62x, 63x and 62y, 63y) facing the driving magnets 71, 72 (that is, the inner peripheral side). There is a possibility that more influence is exerted on the second position detection magnets 63x and 63y. As a result, the required position detection accuracy may not be obtained.

  Therefore, in the present embodiment, as a device for obtaining the position detection accuracy required more reliably, one of the pair of position detection magnets 62x and 63x, that is, a magnetic pole facing the drive magnets 71 and 72 is used. The magnetic force (magnetic flux density) of the second position detection magnet 63x that is disposed (the one disposed on the inner circumferential side) is disposed with the magnetic poles in the same direction as the driving magnets 71 and 72 (outer circumferential). The first position detection magnet 62x is larger than the first position detection magnet 62x.

  By adopting such a configuration, in the image shake correction apparatus 50 of the present embodiment, as indicated by the solid line in FIG. 11, each Hall element (53x, 53y) enters the moving distance of the movable portion 51. It can be configured such that the change in magnetic flux is linear. Therefore, in this way, high position detection accuracy can be ensured in the image blur correction device 50 of the present embodiment.

  In addition, the broken line shown in FIG. 11 shows each Hall element (53x, 53y) with respect to the moving distance of the movable portion 51 when the pair of position detecting magnets 62x, 63x is configured using the same magnetic force, for example. The magnetic flux change to enter is shown. In this case, the pair of position detection magnets 62x and 63x are affected by the drive magnets 71 and 72, and the change in magnetic flux to each Hall element (53x, 53y) with respect to the movement of the movable portion 51 becomes non-linear. ing. For this reason, accurate position detection cannot be performed.

  As described above, the image blur correction device 50 according to the embodiment includes the movable unit 51 configured to include the predetermined imaging lens group (seventh lens group 27) among the plurality of imaging lens groups, and the drive. This is an image shake correction apparatus 50 having a VCM drive unit that drives the movable unit 51 with respect to the fixed unit 61 by using the coil 52 and the drive magnets 71 and 72. The image blur correction device 50 is disposed in the movable portion 51 at each position facing the position detection elements (53x, 53y) disposed in the movable portion 51 and the position detection elements (53x, 53y). A pair of position detection magnets 62x and 63x and a pair of position detection magnets 62y and 63y are provided.

  Here, each of the pair of position detection magnets 62x and 63x and the pair of position detection magnets 62y and 63y is arranged such that different magnetic poles face the surface of each position detection element (53x, 53y). Yes. In this case, one position detection magnet 62x of the pair of position detection magnets 62x and 63x is the first magnet. The other position detection magnet 63x is the second magnet. Similarly, one position detection magnet 62y of the pair of position detection magnets 62y and 63y is the first magnet. The other position detection magnet 63y is the second magnet.

  In this case, the first magnet and the second magnet are sequentially arranged along the direction away from the optical axis O which is the center of the light beam entering the imaging lens (27). The magnetic flux density reaching the surface of the position detection element (53x, 53y) from each of the first magnet and the second magnet is made different.

  For example, the magnetic force of the second magnet is larger than that of the first magnet. Moreover, the 1st magnet and the 2nd magnet apply what consists of a rectangular parallelepiped shape from which only the length in the direction in alignment with the optical axis O differs.

  Specifically, in the case of the present embodiment, for example, the size of the first magnet (the first position detection magnets 62x and 62y) is approximately 5 mm long × 1.5 mm wide × thickness in the optical axis direction 0. .8mm is set. On the other hand, the size of the second magnet (second position detection magnets 63x and 63y) is set to approximately 5 mm in length, 1.5 mm in width, and 1.2 mm in thickness in the optical axis direction.

  That is, as described above, the optical axis O of the second magnet (63x, 63y) is longer than the length (thickness dimension; 0.8 mm) in the direction along the optical axis O of the first magnet (62x, 62y). In this embodiment, the magnetic force of the second magnet (63x, 63y) is set to be larger than that of the first magnet (62x, 62y). Is set to be large, and the distance from the surface of the position detection element (53x, 53y) is set to be different.

  With this configuration, according to the image blur correction device 50 of the above-described embodiment, the change in magnetic flux entering each Hall element (53x, 53y) can be made linear with respect to the moving distance of the movable portion 51. By canceling the influence of the magnetic force from the drive magnets 71 and 72, higher position detection accuracy can be ensured.

  In the above embodiment, as a form of the image blur correction device, the driving coil 52 is provided in the movable portion 51 having the imaging lens (27), and the driving magnets 71 and 72 (magnetic circuit unit 70) are provided in the fixed portion 61. However, the present invention is not limited to this configuration example.

  For example, a configuration in which the magnetic circuit unit 70 including the driving magnets 71 and 72 is provided in the movable portion 51 and the driving coil 52 is provided in the fixed portion 61 may be employed.

  In the above embodiment, the image pickup lens (27) is illustrated as an optical image shake correction apparatus configured to move in a plane orthogonal to the optical axis O. However, the image shake correction apparatus to which the present invention is applied is illustrated. The form is not limited to this form. For example, the present invention can be applied in the same manner to an image blur correction apparatus in which the image sensor 11 is provided in the movable portion 51 and the image sensor 11 is moved in a plane orthogonal to the optical axis O.

[Modification]
In the above-described embodiment, the magnitude of the magnetic flux density reaching the surface of the position detection element from each of the first magnet and the second magnet is different. As a specific example, the length in the direction along the optical axis is used. The form which comprised so that the magnetic force of a 2nd magnet might become larger than the magnetic force of a 1st magnet by using the 1st magnet and the 2nd magnet of a rectangular parallelepiped shape from which only the thickness differs was shown. A configuration example different from the embodiment shown in the above embodiment will be described below.

[First Modification]
FIG. 12 is an enlarged cross-sectional view of a main part showing a first modification of the image blur correction device of one embodiment of the present invention. FIG. 12 corresponds to FIG. 9 in the above-described embodiment. Therefore, in FIG. 12, only the position detection unit (80Ax) in the X direction is illustrated, and the position detection unit in the Y direction is configured as substantially the same as the position detection unit in the X direction, and illustration thereof is omitted. In the following description, only the position detection unit (80Ax) in the X direction will be described.

    In the first modification, the position detection unit 80Ax in the X direction includes a pair of position detection magnets 62Ax and 63Ax and a hall element 53x. Among these, the pair of position detecting magnets 62Ax and 63Ax (referred to as the first magnet 62Ax and the second magnet 63Ax) are formed in the same shape (for example, a rectangular parallelepiped shape) and substantially the same size, and different magnetic materials are used. It is formed using.

  Specifically, in the case of this modification, for example, a magnet having a residual magnetic flux density Br = about 0.8 [T] is used for the first magnet 62Ax, and a residual magnetic flux is used for the second magnet 63Ax. A magnet having a density Br = about 1.3 [T] is used. Thus, the magnetic force of the second magnet 63Ax is configured to be larger than the magnetic force of the first magnet 62Ax. Therefore, the magnetic flux densities reaching the surface of the hall element 53x (position detecting element) from each magnet (62Ax, 63Ax) are made different. Even with such a configuration, it is possible to obtain the same effects as in the above-described embodiment.

[Second Modification]
FIG. 13 is an enlarged cross-sectional view of a main part showing a second modification of the image blur correction apparatus according to the embodiment of the present invention. FIG. 13 also corresponds to FIG. 9 in the above-described embodiment. In FIG. 13, only the position detection unit (80Bx) in the X direction is illustrated, and the position detection unit in the Y direction is assumed to have substantially the same configuration as the position detection unit in the X direction, and illustration thereof is omitted. In the following description, only the position detection unit (80Bx) in the X direction will be described.

  In the second modification, the position detection unit 80Bx in the X direction includes a pair of position detection magnets 62Bx and 63Bx and a hall element 53x. Among these, the pair of position detection magnets 62Bx and 63Bx (referred to as the first magnet 62Bx and the second magnet 63Bx) are formed in the same shape (for example, a rectangular parallelepiped shape) and substantially the same size.

  Specifically, in the case of this modification, for example, the first magnet 62Bx and the second magnet 63Bx have the same size (for example, 5 mm in length × 1.5 mm in width × 1.2 mm in thickness in the optical axis direction). Is used. The pair of position detection magnets 62Bx and 63Bx are arranged at different positions in the direction along the optical axis O (Z-axis direction).

  That is, one first magnet 62Bx of the pair of position detection magnets is disposed such that the distance to the surface of the Hall element 53x is longer than the other second magnet 63Bx. That is, in the configuration of the present modification, the first magnet 62Bx and the second magnet 63Bx are arranged at different positions in the direction along the optical axis O.

  Specifically, the first magnet 62Bx is arranged such that the distance to the surface of the position detection element (53x) is longer than the second magnet 63Bx.

  Accordingly, the magnetic force of the second magnet 63Bx is larger than the magnetic force of the first magnet 62Bx, and thus the strength of the magnetic flux density reaching the surface of the Hall element 53x from each magnet is different. It is configured as follows.

  With such a configuration, the magnetic flux density reaching the surface of the position detection element (53x) from each magnet is made different.

  Even with such a configuration, it is possible to obtain the same effects as in the above-described embodiment.

[Third Modification]
FIG. 14 is an essential part enlarged cross-sectional view showing a third modification of the image blur correction device according to the embodiment of the present invention. FIG. 14 also corresponds to FIG. 9 in the above-described embodiment. In FIG. 14, only the position detection unit (80Cx) in the X direction is shown, and the position detection unit in the Y direction has the same configuration as that of the position detection unit in the X direction, and illustration thereof is omitted. In the following description, only the position detection unit (80Cx) in the X direction will be described.

  In the third modification, an example in which the form of the magnetic circuit unit (70C) is different from the above-described embodiment is shown. That is, in the above-described embodiment, the magnetic circuit unit 70 (see FIG. 9 and the like) has a cross section formed in a substantially E shape. On the other hand, in the magnetic circuit unit 70C in the present modification, as shown in FIG. 14, the driving coil 52C is arranged in the direction orthogonal to the optical axis O on the movable portion main body 55C. In accordance with this, two drive magnets 71C and 72C are arranged on the fixed portion main body 65C at positions facing each of the drive coils 52C via a yoke 73C. .

  In such a configuration, the X-direction position detection unit 80Cx includes a pair of position detection magnets 62Cx and 63Cx and a Hall element 53x. Among these, the pair of position detection magnets 62Cx and 63Cx (referred to as the first magnet 62Cx and the second magnet 63Cx) are formed in a rectangular parallelepiped shape that differs only in the length along the optical axis O.

  That is, one first magnet 62Cx of the pair of position detection magnets is formed such that the distance to the surface of the Hall element 53x is longer than the other second magnet 63Cx. Thus, the magnetic force of the second magnet 63Cx is configured to be larger than the magnetic force of the first magnet 62Cx, and thus the strength of the magnetic flux density reaching the surface of the Hall element 53x from each magnet is varied. Is configured. Even with such a configuration, it is possible to obtain the same effects as in the above-described embodiment.

[Fourth Modification]
FIG. 15 is an essential part enlarged cross-sectional view showing a fourth modification of the image blur correction apparatus according to the embodiment of the present invention. FIG. 15 also corresponds to FIG. 9 in the above-described embodiment. In FIG. 15, only the position detection unit (80Dx) in the X direction is illustrated, and the position detection unit in the Y direction is configured as substantially the same as the position detection unit in the X direction, and the illustration thereof is omitted. In the following description, only the position detection unit (80Dx) in the X direction will be described.

  In the fourth modification, the position detection unit 80Dx in the X direction includes a pair of position detection magnets 62Dx and 63Dx and a hall element 53x. Of these, the pair of position detection magnets 62Dx and 63Dx (referred to as the first magnet 62Dx and the second magnet 63Dx) both have a rectangular parallelepiped shape and differ only in length in a direction orthogonal to the optical axis O. Used. In this case, the first magnet 62Dx has a shorter length in the direction orthogonal to the optical axis O than the second magnet 63Dx.

In other words,
The length in the direction orthogonal to the optical axis of the first magnet 62Dx is denoted by R1,
In the case where the length in the direction orthogonal to the optical axis of the second magnet 63Dx is R2 (see FIG. 14),
R1 <R2
It is comprised so that. In this case,
R2 / R1 = R
When
1 <R ≦ 2
It is desirable to set so that

Specifically, for example, when the length R1 of the first magnet 62Dx is 2.0 mm and the length R2 of the second magnet 63Dx is 2.5 mm,
R = 2.5 [mm] /2.0 [mm]
= 1.25
Thus, the above condition “1 <R ≦ 2” is satisfied.

With this configuration,
It can be configured such that the magnetic force of the first magnet 62Dx <the magnetic force of the second magnet 63Dx. Accordingly, the magnetic flux density reaching the surface of the hall element 53x from each magnet is thereby configured to be different.

  Even with such a configuration, it is possible to obtain the same effects as in the above-described embodiment.

[Fifth Modification]
FIG. 16 is an essential part enlarged cross-sectional view showing a fifth modification of the image blur correction device according to the embodiment of the present invention. FIG. 16 also corresponds to FIG. 9 in the above-described embodiment. In FIG. 16, only the position detection unit (80Ex) in the X direction is illustrated, and the position detection unit in the Y direction is substantially the same as the position detection unit in the X direction, and the illustration thereof is omitted. In the following description, only the position detection unit (80Ex) in the X direction will be described.

  In the fifth modification, the position detection unit 80Ex in the X direction includes a pair of position detection magnets 62Ex and 63Ex, and a hall element 53x. Of these, the pair of position detection magnets 62Ex and 63Ex (first magnet 62Ex and second magnet 63Ex) are both rectangular parallelepiped shapes, and the length in the direction along the optical axis O is orthogonal to the optical axis O. Those having different lengths in the direction to be used are used.

That is, both the length of the first magnet 62Ex in the direction along the optical axis O and the length in the direction orthogonal to the optical axis O are shorter than those of the second magnet 63Ex. With this configuration, the magnetic force of the first magnet 62Ex is weaker than the magnetic force of the second magnet 63Ex, that is,
The magnetic force of the first magnet 62Ex <the magnetic force of the second magnet 63Ex. Even with such a configuration, it is possible to obtain the same effects as in the above-described embodiment.

[Sixth Modification]
FIG. 17 is an essential part enlarged cross-sectional view showing a sixth modification of the image blur correction apparatus according to the embodiment of the present invention. FIG. 17 also corresponds to FIG. 9 in the above-described embodiment. In FIG. 17, only the position detection unit (80Fx) in the X direction is illustrated, and the position detection unit in the Y direction is configured as substantially the same as the position detection unit in the X direction, and illustration thereof is omitted. In the following description, only the position detection unit (80Fx) in the X direction will be described.

  In the sixth modification, the position detection unit 80Fx in the X direction includes a pair of position detection magnets 62Fx and 63F and a hall element 53x. Among these, the pair of position detection magnets 62Fx and 63Fx (referred to as the first magnet 62Fx and the second magnet 63Fx) both have a rectangular parallelepiped shape, and the length in the direction along the optical axis O is orthogonal to the optical axis O. Those having different lengths in the direction to be used are used.

In this case, in this modification, in the length in the direction along the optical axis O,
First magnet 62Fx> second magnet 63Fx
And in the length in the direction perpendicular to the optical axis O,
First magnet 62Fx <second magnet 63Fx
It is said. Even in such a configuration, the magnetic force of the first magnet 62Fx is weaker than the magnetic force of the second magnet 63Fx, that is,
The magnetic force of the first magnet 62Fx <the magnetic force of the second magnet 63Fx. Even with such a configuration, it is possible to obtain the same effects as in the above-described embodiment.

  The surface shape of the pair of position detection magnets provided facing the hall element 53x is generally formed in a plane substantially parallel to the facing surface of the hall element 53x. However, the surface shape of the pair of position detection magnets is not limited to a planar shape, and may be other shapes. For example, the surface of the pair of position detection magnets may be inclined with respect to the opposing surface of the hall element 53x. Further, the surface shape of the pair of position detection magnets may be formed in a different shape different from the plane, such as a shape having a plurality of irregularities or a spherical shape.

  The present invention is not limited to the above-described embodiments, and it is needless to say that various modifications and applications can be implemented without departing from the spirit of the invention. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the above-described embodiment, if the problem to be solved by the invention can be solved and the effect of the invention can be obtained, this constituent requirement is deleted. The configured structure can be extracted as an invention. Furthermore, constituent elements over different embodiments may be appropriately combined. The invention is not limited by the specific embodiments thereof, except as limited by the appended claims.

  The present invention is not limited to an imaging device that is an electronic device specialized for an imaging function such as a digital camera, and other forms of electronic devices having an imaging function, such as a movie camera, a mobile phone, a smartphone, and a recording device. , Electronic notebooks, personal computers, tablet terminal devices, game devices, mobile TVs, watches, navigation devices using GPS (Global Positioning System), and other electronic devices with various imaging functions.

  Further, the present invention can be similarly applied to an electronic device having a function of acquiring an image using an imaging device and displaying the acquired image on a display device, for example, an observation device such as a telescope, binoculars, and a microscope.

  Furthermore, in addition to industrial or medical observation devices such as endoscopes and microscopes, the present invention can be similarly applied to imaging devices such as surveillance cameras and in-vehicle cameras.

  In addition to these, the present invention can be similarly applied to, for example, a projection type image display apparatus that enlarges and projects an image using a transmission type liquid crystal display apparatus or the like.

DESCRIPTION OF SYMBOLS 1 ... Imaging device 10 ... Apparatus main body 11 ... Image pick-up element 14 ... Push-type operation member 15 ... Rotary-type operation member 16 ... Lever-type operation member 20 ... Focus unit 27 ... 7th lens group 30, 30A... Lens barrel 50... Image blur correction device 51... Movable parts 52 and 52C... Driving coil 52a .. Air core parts 53x and 53y. Movable portion main body 55a ...... Opening 59 ... Flexible printed circuit board 61 ... Fixed portion 62x, 62y, 62Ax, 62Bx, 62Cx, 62Dx, 62Ex, 62Fx .... First position detecting magnets 63x, 63y, 63Ax, 63Bx, 63Cx, 63Dx, 63Ex, 63Fx …… Second position detecting magnet 64 …… Ball receiving portion 65, 65C …… Fixing portion main body 65a …… Opening 65b …… Plate 65c …… Cylindrical portion 65d …… Notch portion 66 …… Balls 70 and 70C …… Magnetic circuit units 71 and 72 …… Drive magnets 71C and 72C …… Drive magnet 73 …… First yoke 74 …… Second Yoke 75... Third yoke 73C... Yoke 80x, 80Ax, 80Bx, 80Cx, 80Dx, 80Ex, 80Fx .. Position detection unit

Claims (8)

An image shake correction apparatus comprising: a movable part having an imaging element or an imaging lens; and a VCM driving part that drives the movable part with respect to the fixed part by using a coil and a driving magnet,
A position detecting element arranged on one of the movable part or the fixed part;
A pair of position detection magnets disposed at positions facing the position detection element and disposed on the other of the movable part or the fixed part;
Comprising
The pair of position detection magnets are a first magnet and a second magnet arranged so that different magnetic poles face the surface of the position detection element,
The first magnet and the second magnet are sequentially arranged along a direction away from an optical axis which is a center of a light beam incident on the imaging element or the imaging lens,
An image blur correction apparatus, wherein the magnitudes of magnetic flux densities reaching the surface of the position detection element from each of the first magnet and the second magnet are different.   2. The image blur correction device according to claim 1, wherein the second magnet of the pair of position detection magnets also has a function of canceling an influence of a magnetic force from a neighboring unit.   The image blur correction device according to claim 2, wherein the magnetic force of the second magnet is larger than the magnetic force of the first magnet.   The image blur correction device according to claim 3, wherein the first magnet and the second magnet are formed in a rectangular parallelepiped shape that differs only in the length along the optical axis.   4. The image blur correction device according to claim 3, wherein the first magnet and the second magnet have a rectangular parallelepiped shape having the same shape and the same size, and are formed of different materials.   The image according to claim 3, wherein the first magnet and the second magnet have a rectangular parallelepiped shape having the same shape and the same size, and are arranged so that positions in a direction along the optical axis are different. Shake correction device.   The image blur correction apparatus according to claim 3, wherein the first magnet and the second magnet are formed in a rectangular parallelepiped shape that is different only in a length in a direction orthogonal to the optical axis direction.   The first magnet and the second magnet are formed in a rectangular parallelepiped shape in which both the length in the direction along the optical axis and the length in the direction orthogonal to the optical axis direction are different. The image blur correction device according to claim 3.

Images