Patent Publication Number: US-11656530-B2

Title: Image blur correction device having image blur-correcting function

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to an image blur correction device having an image blur-correcting function. 
     Description of the Related Art 
     In recent years, there have been proposed some types of a system of an image blur correction mechanism equipped in an image capture apparatus or a lens barrel. For example, there are known a system of driving some of lenses of a photographing optical system for image blur correction and a system of driving an image capture device included in a camera body for image blur correction. Further, there is known a system in which the above-mentioned systems are combined for image blur correction, so as to drive both of the some of lenses of the photographing optical system and the image capture device. 
     The above-mentioned image blur correction mechanism that drives the lens and/or the image capture device (hereinafter generically referred to as the optical element) generally employs a system for moving the optical element in a direction orthogonal to a photographing optical axis. As a system for driving the optical element, there is known one referred to as the voice coil motor (VCM) system. The VCM system has a configuration in which magnets are provided in one of a fixed member and a movable member, a coil is provided in the other, and the coil is energized in a magnetic circuit formed by the magnets to thereby generate a driving force derived from the Lorentz force. In the VCM system, a predetermined space is formed between the magnets and the coil, and rolling members, such as balls, are provided in this space, whereby it is possible to smoothly drive the optical element with less loss caused by friction. Surfaces on which the rolling members rolls during driving is referred to as the rolling surfaces. The rolling surfaces are generally formed by a method of affixing a roll reception member having a hard surface to the movable member and the fixed member. 
     In combination, to prevent the rolling members from falling off, a mechanism is generally integrated which generates an urging force for urging both of the fixed member and the movable member toward the rolling members. As the urging method, there are known a method of urging the fixed member and the movable member using a spring such that the rolling members are sandwiched between the movable member and the fixed member, and a method of arranging magnets and a magnetic component (object to be attracted) in one and the other of the movable member and the fixed member, respectively, thereby causing the movable member and the fixed member to magnetically attract each other. 
     Further, for an image capture apparatus equipped with an image blur correction mechanism (image plane anti-vibration mechanism) that translationally moves an image capture device package holding an image capture device, there has been proposed a technique focusing on a problem caused in a case where part for holding the image capture device package is formed of resin. Japanese Laid-Open Patent Publication (Kokai) No. 2008-64863 discloses a technique focusing on heat dissipation of the image capture device package, and using, in a case where a movable frame for holding the image capture device package is formed of resin, resin having a high thermal conductivity. According to the technique disclosed in Japanese Laid-Open Patent Publication (Kokai) No. 2008-64863, it is possible to prevent excessive temperature rise of the image capture device package and an image sensor, whereby it is possible to provide a proper image with suppressed thermal noise. 
     Incidentally, in Japanese Laid-Open Patent Publication (Kokai) No. 2013-231923, when the movable member is molded of resin, the rolling surfaces described above are formed by molding the movable member integrally with a ball receiving sheet metal. With this, a step for mounting a member forming the rolling surfaces is eliminated. However, since the movable member is mainly formed of resin, in a case where the optical element held by the movable member is relatively large or heavy, it is important to ensure the strength of the movable member for driving the movable member such that the function of the optical element is properly maintained. Particularly, in a case where the method of forming the rolling surfaces as disclosed in Japanese Laid-Open Patent Publication (Kokai) No. 2013-231923 is employed, the strength of the movable member is not considered, which may cause insufficiency of the strength. 
     Further, the technique disclosed in Japanese Laid-Open Patent Publication (Kokai) No. 2008-64863 focuses on the temperature of the sensor, but does not consider deformation of a component, caused due to temperature change. For example, there is a fear that there may arise such a problem that the image plane is bent due to temperature change, making it is impossible to adjust the focus on the whole screen. Particularly, in a case where the components are fixed with an adhesive, there is a fear that it is impossible to maintain the performances of the components due to thermal stress occurring on adhesion interface. Therefore, there is room for improvement in suppressing lowering of the reliability, which can be caused due to thermal stress occurring on the adhesion interface. 
     SUMMARY OF THE INVENTION 
     The present invention provides an image blur correction device that forms a strong rolling surface on a movable member having a resin part and is improved in strength of the movable member. 
     Further, the present invention provides an image blur correction device that suppresses occurrence of thermal stress on an adhesion interface and is thereby improved in reliability. 
     In a first aspect of the present invention, there is provided an image blur correction device comprising a fixed member, a rolling member, and a movable member that includes a sheet metal member and a resin part molded integrally with the sheet metal member, holds an optical element, and is movable via the rolling member relative to the fixed member in a direction orthogonal to an optical axis of the optical element, wherein part of the movable member, where the sheet metal member is exposed from the resin part, forms a rolling surface on which the rolling member rolls, and wherein the sheet metal member is formed into a shape surrounding the optical element, as viewed from an optical axis direction. 
     In a second aspect of the present invention, there is provided an image blur correction device comprising an image capture device package including an image capture device, a holding member that holds the image capture device package, a fixed part that holds the holding member such that the holding member is relatively displaceable, and an adhesive for fixing a first adhesion interface on the image capture device package and a second adhesion interface on the holding member, wherein a linear expansion coefficient of part forming the first adhesion interface is larger than a linear expansion coefficient of the image capture device, wherein part forming the second adhesion interface is formed of resin, and a linear expansion coefficient of the part forming the second adhesion interface is larger than the linear expansion coefficient of the part forming the first adhesion interface, and wherein the linear expansion coefficient of the part forming the second adhesion interface is smaller than a linear expansion coefficient of any of an aluminum alloy and a magnesium alloy. 
     In a third aspect of the present invention, there is provided an image blur correction device comprising an image capture device package including an image capture device, a holding member that includes a sheet metal member and a resin part molded integrally with the sheet metal member, and holds the image capture device package, a fixed part that holds the holding member such that the holding member is relatively displaceable, and an adhesive for fixing a first adhesion interface on the image capture device package and a second adhesion interface on the holding member, wherein a linear expansion coefficient of part forming the first adhesion interface is larger than a linear expansion coefficient of the image capture device, wherein the second adhesion interface is formed by the resin part, and a linear expansion coefficient of part forming the second adhesion interface is larger than the linear expansion coefficient of the part forming the first adhesion interface, and wherein the linear expansion coefficient of the part forming the second adhesion interface is smaller than a linear expansion coefficient of the sheet metal member. 
     According to the first aspect of the present invention, it is possible to form the strong rolling surface on the movable member having the resin part and improve the strength of the movable member. 
     Further, according to the second and third aspects of the present invention, it is possible to suppress occurrence of thermal stress on the adhesion interface, and thereby improve the reliability. 
     Further features of the present invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings). 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1 A  is a cross-sectional view of an image capture apparatus to which an image blur correction device is applied. 
         FIG.  1 B  is a block diagram showing an electrical configuration of the image capture apparatus to which the image blur correction device is applied. 
         FIG.  2 A  is a perspective view of a camera-side shake correction unit. 
         FIG.  2 B  is an exploded perspective view of the camera-side shake correction unit. 
         FIG.  3 A  is a view of a movable member, as viewed from a + (positive) side in a z-axis direction. 
         FIG.  3 B  is a view of the movable member, as viewed from a − (negative) side in the z-axis direction. 
         FIG.  3 C  is a view of the movable member, as viewed from the − (negative) side in the z-axis direction. 
         FIG.  4 A  is a view of the camera-side shake correction unit, as viewed from the + (positive) side in the z-axis direction. 
         FIG.  4 B  is a view showing part of a cross-section taken along A-A in  FIG.  4 A . 
         FIG.  4 C  is a view showing part of a cross-section taken along B-B in  FIG.  4 A . 
         FIG.  5 A  is a view of the camera-side shake correction unit, as viewed from the + (positive) side in the z-axis direction. 
         FIG.  5 B  is a view of the movable member, as viewed from the − (negative) side in the z-axis direction. 
         FIG.  5 C  is a view showing part of a cross-section taken along C-C in  FIG.  5 A . 
         FIG.  5 D  is a view showing part of a cross-section taken along D-D in  FIG.  5 A . 
         FIG.  6 A  is a view of the camera-side shake correction unit, as viewed from the + (positive) side in the z-axis direction. 
         FIG.  6 B  is a view showing part of a cross-section taken along E-E in  FIG.  6 A . 
         FIG.  7 A  is a view of the camera-side shake correction unit, as viewed from the + (positive) side in the z-axis direction. 
         FIG.  7 B  is a view showing part of a cross-section taken along F-F in  FIG.  7 A . 
         FIG.  7 C  is a cross-sectional view of a comparative example. 
         FIG.  8 A  is a view of the movable member, as viewed from the +(positive) side in the z-axis direction. 
         FIG.  8 B  is a cross-sectional view taken along J-J in  FIG.  8 A . 
         FIG.  9 A  is a view of a lens-side shake correction unit, as viewed from the + (positive) side in the z-axis direction. 
         FIG.  9 B  is a cross-sectional view taken along G-G in  FIG.  9 A . 
         FIG.  9 C  is a cross-sectional view taken along H-H in  FIG.  9 A . 
         FIG.  10 A  is a cross-sectional view of an image capture apparatus to which an image blur correction device according to a seventh embodiment of the present invention is applied. 
         FIG.  10 B  is a block diagram showing an electrical configuration of the image capture apparatus to which the image blur correction device is applied. 
         FIG.  11    is an exploded perspective view of essential parts of an anti-vibration mechanism. 
         FIG.  12 A  is a schematic cross-sectional view showing a form of adhesion between an image capture device package and a movable frame. 
         FIG.  12 B  is a schematic cross-sectional view showing another form of adhesion between the image capture device package and the movable frame. 
         FIG.  12 C  is a cross-sectional view schematically showing distortion of the image capture device package. 
         FIG.  13 A  is a view of the anti-vibration mechanism, as viewed from an optical axis direction. 
         FIG.  13 B  is a cross-sectional view taken along A-A in  FIG.  13 A . 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The present invention will now be described in detail below with reference to the accompanying drawings showing embodiments thereof. 
       FIG.  1 A  is a cross-sectional view of an image capture apparatus to which an image blur correction device according to a first embodiment of the present invention is applied.  FIG.  1 B  is a block diagram showing an electrical configuration of the image capture apparatus, denoted by reference numeral  1000 . This image capture apparatus  1000  is formed by a camera body  1  and a lens barrel  2 . The lens barrel  2  is removable from the camera body  1  and the image capture apparatus  1000  is a so-called lens interchangeable camera. Note that the present invention can be applied even to an image capture apparatus including the lens barrel  2  which is fixed to the camera body  1  and cannot be removed therefrom. 
     The lens barrel  2  includes a photographing optical system  3 , a lens system controller  12 , a lens drive section  13 , and a lens-side shake detection section  16 . The photographing optical system  3  is formed by a plurality of lenses. The lens drive section  13  drives a focus lens for adjusting focus and a shake correction lens  3   a  for performing shake correction. The lens drive section  13  has a lens-side shake correction unit  13   a . The lens-side shake correction unit  13   a  drives the shake correction lens  3   a  in a direction orthogonal to an optical axis  4  (photographing optical axis) of the photographing optical system  3 . The lens-side shake detection section  16  detects a shake amount of the image capture apparatus  1000 . 
     The camera body  1  includes a camera system controller  5 , an image capture device  6 , an image processor  7 , a memory section  8 , a display section  9 , an operation detection section  10 , a camera-side shake correction unit  14 , a camera-side shake detection section  15 , and an electric contact  11 . The image capture device  6  is an optical element that photoelectrically converts an optical image formed through the lens barrel  2 . The display section  9  includes a rear-side display device  9   a  provided on a rear side of the camera body  1  and an EVF (electronic viewfinder)  9   b  provided within a finder of the camera body  1 . The operation detection section  10  detects a signal output from an operation section including a shutter release button, not shown, and so forth. The electric contact  11  is for communication between the camera body  1  and the lens barrel  2 . The camera-side shake correction unit  14  drives the image capture device  6  in a direction orthogonal to the optical axis  4 . The camera-side shake detection section  15  detects a shake amount of the image capture apparatus  1000 . 
     The image capture apparatus  1000  formed by the camera body  1  and the lens barrel  2  has an image capture unit, an image processing unit, a recording/reproduction unit, and a control unit. The image capture unit mentioned here includes the photographing optical system  3  and the image capture device  6 , and the image processing unit includes the image processor  7 . Further, the recording/reproduction unit includes the memory section  8  and the display section  9 . The control unit includes the camera system controller  5 , the operation detection section  10 , the camera-side shake detection section  15 , the camera-side shake correction unit  14 , the lens system controller  12 , and the lens-side shake detection section  16 , and further includes the lens drive section  13  including the lens-side shake correction unit  13   a . Note that the lens system controller  12  and the lens drive section  13  can drive not only the shake correction lens  3   a , but also the focus lens, a diaphragm, and so forth, none of which are shown. 
     The camera-side shake detection section  15  and the lens-side shake detection section  16  are capable of detecting rotation of the image capture apparatus  1000  about the optical axis  4 , and the detection of rotation is realized by using e.g. a vibrating gyroscope. The camera-side shake correction unit  14  is a mechanism that drives the image capture device  6  on a plane orthogonal to the optical axis  4 . The lens-side shake correction unit  13   a  is a mechanism that drives the shake correction lens  3   a  in a direction orthogonal to the optical axis  4 . 
     The above-described image capture unit is an optical processing system configured to form through the photographing optical system  3  an image of light from an object on an image plane of the image capture device  6 . A focus evaluation amount and a proper exposure amount can be obtained from the image capture device  6  and the photographing optical system  3  is properly adjusted based on signals thereof, whereby the image capture device is exposed to an object light with a proper light amount to form an object image at or in the vicinity of the image capture device  6 . 
     The image processor  7  has an analog-to-digital converter, a white balance adjustment circuit, a gamma correction circuit, an interpolation calculation circuit, etc., therein, and is capable of generating an image for recording. A color interpolation processor is included in this image processor  7  and generates a color image by performing color interpolation (demosaicing) on Bayer signals. Further, the image processor  7  compresses a still image, a moving image, sound, and so forth, using a predetermined method. Note that the image processor  7  can also generate a shake detection signal based on comparison between a plurality of images obtained from the image capture device  6 , and hence the camera-side shake detection section  15  may be formed by the image capture device  6  and the image processor  7 . 
     The memory section  8  includes a storage medium. The camera system controller  5  outputs an image to the memory section  8  and displays an image to be presented to a user on the display section  9 . The camera system controller  5  generates and outputs a timing signal, and so forth, for use in image capture. The camera system controller  5  controls the image capture system, the image processing system, and the recording and reproduction system, in response to an external operation. For example, when it is detected by the operation detection section  10  that the shutter release button, not shown, has been pressed, the camera system controller  5  controls driving of the image capture device  6 , the operations of the image processor  7 , including compression processing, and so forth. Further, the camera system controller  5  controls the state of each segment on the display section  9 . Note that the rear-side display device  9   a  is implemented by a touch panel and hence the rear-side display device  9   a  may serve as both the display section  9  and the operation section. 
     The operation for adjusting the optical system will be described. The image processor  7  is connected to the camera system controller  5 , and the camera system controller  5  determines an appropriate focus position and diaphragm position based on signals output from the image capture device  6 . The camera system controller  5  sends commands to the lens system controller  12  via the electric contact  11 , and the lens system controller  12  properly controls a focus lens drive section and a diaphragm drive section, neither of which is shown. Further, in a mode for performing shake correction, the camera system controller  5  properly controls the camera-side shake correction unit  14  based on signals obtained from the camera-side shake detection section  15 . Similarly, the lens system controller  12  properly controls the lens-side shake correction unit  13   a  based on signals obtained from the lens-side shake detection section  16 . 
     More specifically, first, the camera system controller  5  and the lens system controller  12  acquire camera shake signals detected by the camera-side shake detection section  15  and the lens-side shake detection section  16 , respectively. Then, the camera system controller  5  and the lens system controller  12  calculate a driving amount of the image capture device  6  and a driving amount of the shake correction lens  3   a  for correcting image blur, based on the acquired shake signals, respectively. After that, the camera system controller  5  and the lens system controller  12  send the calculated driving amounts to the camera-side shake correction unit  14  and the lens-side shake correction unit  13   a  as the command values to drive the image capture device  6  and the shake correction lens  3   a , respectively. 
     Further, as described above, the camera system controller  5  and the lens system controller  12  control the operations of the components of the camera body  1  and the lens barrel  2  in response to user operations performed on respective operation sections provided on the camera  1  and the lens barrel  2 . This makes it possible to photograph a still image and a moving image. 
       FIGS.  2 A and  2 B  are a perspective view and an exploded perspective view of the camera-side shake correction unit  14 , respectively. The camera-side shake correction unit  14  that displaces the image capture device  6  in the direction orthogonal to the optical axis  4  will be described with reference to  FIGS.  2 A and  2 B . The directions of the camera-side shake correction unit  14  will be described using coordinate axes indicated in  FIG.  2 A . More specifically, a longitudinal direction of the image capture device  6  is defined as an x-axis, a shorter direction of the image capture device  6  is defined as a y-axis, and a direction of the optical axis  4  (photographing optical axis direction) is defined as a z-axis. A + (positive) side in the z-axis direction is an object side. A + (positive) side in the y-axis direction is the upper side of the image capture apparatus  1000  in a normal use state. 
     The camera-side shake correction unit  14  includes a movable unit and a fixed member  28  as the main components. This movable unit includes a movable member  20 , coils  21 , position detection sections  22 , a flexible circuit board  23 , and the image capture device  6 . The movable unit formed by integrally assembling these components can be displaced in the direction orthogonal to the optical axis  4  relative to the fixed member  28 . 
     As shown in  FIG.  2 B , as the coils  21  for driving, there are provided three coils ( 21   a ,  21   b , and  21   c ). The coil  21   a  drives the movable member  20  in the x-axis direction and the coils  21   b  and  21   c  drive the same in the y-axis direction. With these three coils  21 , the movable member  20  is displaceable in the x-axis direction and the y-axis direction, and further, rotationally displaceable about the z-axis. 
     The position detection sections  22  ( 22   a ,  22   b , and  22   c ) are provided inside the coils  21   a ,  21   b , and  21   c , respectively. The position detection sections  22   a ,  22   b , and  22   c  detect positions of the coils  21   a ,  21   b , and  21   c , respectively. Each position detection section  22  is formed e.g. by a Hall element, and detects a position of a corresponding one of the coils  21  by detecting a change in magnetic flux density within a magnetic field generated by magnets, described hereinafter, whereby the position of the movable member  20  is detected. The coils  21  and the position detection sections  22  are mounted on the flexible circuit board  23 . The flexible circuit board  23  electrically connects between a driving circuit, not shown, and the movable member  20 . 
     The camera-side shake correction unit  14  further includes a plurality of magnets  24  for driving, a first yoke  25 , and a second yokes  29 . The second yoke  29  is divided into two parts: a second yoke  29   a  opposed to the coil  21   a  and a second yoke  29   b  opposed to the coils  21   b  and  21   c . However, the second yoke  29  is not necessarily required to be divided into the two parts. Spacers  27  are members for securing a fixed space between the fixed member  28  and the first yoke  25  which are fixed to each other. The spacers  27  also serve as a drive regulation section which is brought into abutment with the movable member  20  before the movable member  20  is displaced up to a drive limit area during driving. The drive limit area is a maximum range within which the coils  21  do not extend outside the area where the magnets  24  are arranged. 
     The camera-side shake correction unit  14  is provided with a total of twelve magnets  24 . Magnets  24   g  to  241  of the magnets  24  are fixed to the fixed member  28  via the second yoke  29 . The magnets  24   g  to  241  are inserted through openings formed in the fixed member  28 , and the second yoke  29  is fixed to the fixed member  28  from a − (negative) side in the z-axis direction, whereby the positions of the magnets  24   g  to  241  are fixed. Magnets  24   a  to  24   f  are arranged on an opposite side from the fixed member  28  across the movable member  20  in the direction of the optical axis  4 . Three rolling balls  26  as rolling members are arranged between the movable member  20  and the fixed member  28 . The rolling balls  26  roll when the movable member  20  is driven with respect to the fixed member  28 , whereby the movable member  20  can be displaced relative to the fixed member  28  with less friction. 
     Next, the roles of the above-described components when the movable member  20  is driven will be described. In a case where the movable member  20  is driven in the x-axis direction, the movable member  20  is driven in the x-axis direction by the coil  21   a  and the magnets  24   a ,  24   b ,  24   g , and  24   h , opposed to the coil  21   a . By energizing the coil  21   a  arranged in a magnetic circuit formed by the magnets  24   a ,  24   b ,  24   g , and  24   h , the coil  21   a  receives the Lorentz force, whereby the movable member  20  is moved in the x-axis direction. 
     In a case where the movable member  20  is driven in the y-axis direction, the movable member  20  is driven in the y-axis direction by the coils  21   b  and  21   c  and the magnets  24   c ,  24   d ,  24   e ,  24   f ,  24   i ,  24   j ,  24   k , and  24   l , opposed to the coils  21   b  and  21   c . By energizing the coil  21   b  arranged in a magnetic circuit formed by the magnets  24   c ,  24   d ,  24   i , and  24   j , the coil  21   b  receives the Lorentz force in the y-axis direction. Similarly, by energizing the coil  21   c  arranged in a magnetic circuit formed by the magnets  24   e ,  24   f ,  24   k , and  24   l , the coil  21   c  receives the Lorentz force in the y-axis direction. In a case where the coils  21   b  and  21   c  are energized to receive the forces in the same direction, the movable member  20  is translationally moved in the y-axis direction. In a case where the coils  21   b  and  21   c  are energized to receive the forces in the directions opposite to each other, respectively, the movable member  20  is rotationally moved about a rotational axis parallel to the z-axis direction. Therefore, the movable member  20  of the camera-side shake correction unit  14  can be translationally moved within a plane (x-y plane) orthogonal to the optical axis  4  and be rotationally moved about the z-axis direction. 
       FIGS.  3 A and  3 B  are views of the movable member  20 , as viewed from the + (positive) side in the z-axis direction and the − (negative) side in the z-axis direction, respectively.  FIG.  3 C  is a view of the movable unit including the movable member  20  and the image capture device  6 , as viewed from the − (negative) side in the z-axis direction. Not only the movable unit, but also formation of rolling surfaces using an insert sheet metal will be described with reference to  FIGS.  3 A to  3 C . 
     As shown in  FIG.  3 A , the movable member  20  has a resin part  20   a  and a sheet metal member  20   b . In the movable member  20 , the resin part  20   a  is molded integrally with the sheet metal member  20   b . That is, the resin part  20   a  is molded integrally with the sheet metal member  20   b  by insert molding. In  FIGS.  3 A and  3 B , part indicated by a broken line is the sheet metal member  20   b . Basically (except the rolling surfaces, denoted by reference numeral  30 , described hereinafter), the resin part  20   a  is molded integrally with the sheet metal member  20   b  such that the sheet metal member  20   b  is covered with the resin part  20   a . The sheet metal member  20   b  is made of a metal having magnetism. 
     As shown in  FIG.  3 B , the movable member  20  is provided with the rolling surfaces  30  ( 30   a ,  30   b , and  30   c ), which are brought into contact with the rolling balls  26 , respectively. Each rolling surface  30  is part of the sheet metal member  20   b , and in the movable member  20 , parts exposed from the resin part  20   a  toward the − (negative) side in the z-axis direction form the rolling surfaces  30 . The rolling surfaces  30  are provided in plural as the surfaces on which the rolling balls  26  roll when the movable member  20  is moved in the x-axis direction and the y-axis direction, and in the present embodiment, the three rolling surfaces  30  are formed on the movable member  20 . When integrally forming the sheet metal member  20   b  and the resin part  20   a , the rolling surfaces  30   a  to  30   c  are formed by causing portions of the sheet metal member  20   b  to be exposed from the resin part  20   a.    
     The movable member  20  is brought into contact with the fixed member  28  via the rolling balls  26 , and hence if the camera body  1  receives an impact, caused e.g. by dropping, the movable member  20  receives the impact from the fixed member  28  via the rolling balls  26 . At this time, if flaws and dents are generated and remain in the rolling surfaces  30 , each rolling ball  26  does not smoothly move where the flaws and dents are formed, during afterward shake correction, which adversely affects the shake correction. Therefore, the rolling surfaces  30  are required to have such hardness as will be resistant to impact. For this reason, in a case where the movable member  20  is made of a material having relatively low hardness, such as resin, it is necessary to additionally use a member having high hardness for a member forming the rolling surfaces  30 . Conventionally, when forming the movable member of e.g. resin, there is mostly used a method of affixing a sheet metal having high hardness to the rolling surface as an additional member. However, in a case where the sheet metal is affixed, an additional affixing step is required, and further, a problem is caused that not only a component tolerance of the sheet metal as a single component but also an assembling tolerance due to e.g. oblique assembling of the component into the movable member  20  is included. 
     In the present embodiment, since the sheet metal member  20   b  is brought into contact with the rolling balls  26  on the rolling surfaces  30 , the rolling surfaces  30  can have sufficient hardness to be resistant to impact. Further, since the resin part  20   a  is molded integrally with the sheet metal member  20   b , the affixing step is not required to be included in the process for manufacturing the movable member  20 , and further, it is possible to avoid variation of the rolling surfaces  30  due to affixing. 
     As is clear from comparison between  FIG.  3 C  and  FIG.  3 B , the sheet metal member  20   b  is arranged such that it surrounds the image capture device  6 , as viewed from the z-axis direction (or the direction of the optical axis  4 ). Thus, the sheet metal member  20   b  is formed into a shape surrounding the image capture device  6 , whereby although the movable member  20  is mainly formed of resin, it is possible to increase the strength of the movable member  20 . Particularly, when driving a relatively large component element of the image capture apparatus  1000 , such as the image capture device  6  and a large optical member, if impact caused e.g. by dropping is received, a large force is applied to the movable member  20 . Therefore, if the movable member  20  is formed only of resin, the movable member  20  cannot resist the impact, which causes deformation and breakage and can adversely affect a photographed image. To prevent this, the resin part  20   a  is molded integrally with the sheet metal member  20   b , and the inserted sheet metal member  20   b  is arranged on the whole movable member  20  such that it surrounds the image capture device  6 , whereby it is possible to increase the strength of the movable member  20  and thereby prevent deformation and breakage. 
     Further, by arranging the sheet metal member  20   b  such that it surrounds the image capture device  6 , it is also possible to reduce noise (image deterioration) occurring on the image capture device  6 . As described with reference to  FIGS.  2 A and  2 B , the movable member  20  is driven by the Lorentz force generated by energizing the coils  21  arranged in the magnetic circuits formed by the magnets  24 . At this time, a signal which is originally not expected to be imaged is sometimes generated in the image capture device  6  as noise (hereinafter referred to as the magnetic noise) due to the influence of the magnetic fields formed in the coils  21 . However, since the sheet metal member  20   b  is arranged such that it surrounds the image capture device  6 , the magnetic fields generated by the coils  21  are shielded by the sheet metal member  20   b  and hard to reach the image capture device  6 . Thus, the arrangement of the sheet metal member  20   b , surrounding the image capture device  6 , also makes it possible to reduce the magnetic noise generated by energizing the coils  21 . 
     Next, an urging mechanism (urging unit) of the camera-side shake correction unit  14  for urging the movable member  20  against the fixed member  28  will be described with reference to  FIGS.  4 A to  4 C .  FIG.  4 A  is a view of the camera-side shake correction unit  14 , as viewed from the + (positive) side in the z-axis direction.  FIGS.  4 B and  4 C  are views showing part of a cross-section taken along A-A and part of a cross-section taken along B-B in  FIG.  4 A , respectively. 
     As shown in  FIG.  4 B , the image capture device  6  is fixedly mounted on the movable member  20  with an adhesive  40 . With this, the movable member  20  fixedly holds the image capture device  6 . A reason why a surface of the movable member  20 , which is bonded to the image capture device  6  with the adhesive  40 , is formed by the resin part  20   a  will be described. In general, when bonding components using an adhesive, it is necessary to provide a place where the adhesive is applied (hereinafter referred to as the adhesive pool). In general, the same image capture device  6  can be used for a lot of models, but on the other hand, the movable member  20  is designed on a model-by-model basis, and hence the adhesive pool is also designed on a model-by-model basis. For this reason, to make it possible to freely arrange the adhesive pool with a higher degree of freedom in shape, it is preferable that the bonding surface is formed by the resin part  20   a.    
     Further, when the camera body  1  is exposed to a high-temperature or low-temperature environment, if a difference in the linear expansion coefficient is large between an outer periphery portion of the image capture device  6 , as one bonding surface, and part of the movable member  20 , as the other bonding surface, the image capture device  6  and the movable member  20  may warp in a direction opposite to each other. This is caused by occurrence of thermal distortion. If the image capture device  6  thus warps from the movable member  20 , a problem is caused that the image capture device  6  tilts with respect to the optical axis  4  and hence tilts with respect to the image plane of the image capture apparatus  1000 , which may cause blur in part of a photographed image. One solution for this problem is that the linear expansion coefficient of the bonding surface of the movable member  20 , bonded to the image capture device  6 , and the linear expansion coefficient of the bonding surface of the image capture device  6  are made closer to each other. 
     In the present embodiment, the movable member  20  is formed by the resin part  20   a  and the sheet metal member  20   b . Assuming that the sheet metal member  21   b  is largely different in the linear expansion coefficient from the image capture device  6 , it is preferable that the resin part  20   a  is formed by a resin material having a linear expansion coefficient close to that of the image capture device  6 . Thus, considering the degree of freedom in selecting the material, it is also preferable to form the bonding surface of the movable member  20  where the image capture device  6  is bonded, by using the resin part  20   a . As described above, from the viewpoint of the degree of freedom in shape and the viewpoint of the physical properties of the materials, it is preferable that the surface of the movable member  20  where the image capture device  6  is bonded is formed by the resin part  20   a.    
     Next, the urging mechanism for urging the movable member  20  against the fixed member  28  will be described. As shown in  FIG.  4 C , the rolling balls  26  are arranged on the − (negative) side in the z-axis direction of the movable member  20 . In this case, it is preferable that the movable member  20  is also urged toward the − (negative) side in the z-axis direction. In general, in a case where a fixed member and a movable member are urged, it is necessary to additionally arrange a member for urging them. However, in the present embodiment, an urging force is obtained by using magnetism of the sheet metal member  20   b  and the magnets  24 . 
     The sheet metal member  20   b  is formed of magnetic material. As is clear from  FIG.  4 B , part of the sheet metal member  20   b  is opposed to the magnets  24 , and hence the sheet metal member  20   b  is attracted by the magnets  24 . The action of attracting the sheet metal member  20   b  by the magnets  24  is hereinafter referred to as the “magnetic attraction”. Therefore, whether the movable member  20  is more strongly magnetically-attracted toward the first yoke  25  (+ (positive) side in the z-axis direction) or the second yoke  29   b  (− (negative) side in the z-axis direction) is determined depending on a distance from the sheet metal member  20   b  to the magnets  24  in the z-axis direction. 
     Here, reference numeral  41  in  FIG.  4 B  indicates a distance from the sheet metal member  20   b  to the magnets  24   e  and  24   f  mounted on the first yoke  25 . Reference numeral  42  indicates a distance from the sheet metal member  20   b  to the magnets  24   k  and  24   l  mounted the second yoke  29   b . Note that when comparing these distances  41  and  42 , the position of the sheet metal member  20   b  is represented by the position of the center of the sheet metal member  20   b  in a direction of the thickness thereof. In the present embodiment, the distance  42  is shorter than the distance  41 . Therefore, the attraction force applied to the sheet metal member  20   b  is stronger on the − (negative) side in the z-axis direction than on the + (positive) side in the z-axis direction, and as a result, the movable member  20  is urged toward the fixed member  28 . Further, similarly, the sheet metal member  20   b  is closer to the magnets  24   g  and  24   h  (see  FIG.  2 B ) than to the magnets  24   a  and  24   b . Therefore, it is possible to smoothly drive the rolling balls  26  on the rolling surfaces  30  with less loss caused by friction. 
     As described above, in the movable member  20 , the resin part  20   a  is molded integrally with the sheet metal member  20   b  such that it is closer to the magnets  24  on the − (negative) side in the z-axis direction than to the magnets  24  on the + (positive) side in the z-axis direction. With this, the sheet metal member  20   b  not only provides the rolling surfaces  30 , but also is capable of functioning as the urging mechanism. 
     According to the present embodiment, parts of the sheet metal member  20   b  in the movable member  20 , exposed from the resin part  20   a , form the rolling surfaces  30 . This makes it possible to form the strong rolling surfaces on the movable member  20  including the resin part and reduce the number of steps for forming the rolling surfaces  30 . Further, the movable member  20  is formed by molding the resin part  20   a  integrally the sheet metal member  20   b , and the sheet metal member  20   b  is formed into the shape surrounding the image capture device  6 , as viewed from the direction of the optical axis  4 . This makes it possible to increase the strength of the movable member  20 . What is more, it is possible to reduce magnetic noise caused by energization of the coils  21 . 
     Further, the movable member  20  and the fixed member  28  are urged such that they are attracted to each other, by using part (magnetic portion) of the sheet metal member  20   b . What is more, since the distance  42  is shorter than the distance  41 , the movable member  20  is urged toward the fixed member  28 . This makes it possible to simplify the manufacturing process by eliminating the need of an additional urging member for preventing the rolling balls  26  from falling off. 
     Further, the image capture device  6  is fixed to the resin part  20   a  of the movable member  20 . This makes it possible to increase the degree of freedom in selecting the material and the shape, for the bonding surface where the image capture device  6  is bonded to the movable member  20 . 
     An image capture apparatus according to a second embodiment of the present invention will be described with reference to  FIGS.  5 A to  5 D . The present embodiment differs from the first embodiment in the components of the sheet metal member  20   b  of the movable member  20  and is basically the same in the other components as the first embodiment. Therefore, the description will be mainly given of the different points from the first embodiment. 
       FIG.  5 A  is a view of the camera-side shake correction unit  14 , as viewed from the + (positive) side in the z-axis direction.  FIG.  5 B  is a view of the movable member, as viewed from the − (negative) side in the z-axis direction.  FIGS.  5 C and  5 D  are views showing part of a cross-section taken along C-C in  FIG.  5 A  and part of a cross-section taken along D-D in  FIG.  5 A , respectively. 
     The camera-side shake correction unit  14  includes the movable member, denoted by reference numeral  50 . The movable member  50  includes not only a resin part  50   a  and a sheet metal member  50   b , but also a magnetic sheet metal  50   c  for magnetic attraction. The movable member  50 , the resin part  50   a , and the sheet metal member  50   b  correspond to the movable member  20 , the resin part  20   a , and the sheet metal member  20   b  in the first embodiment, respectively. In the movable member  50 , the resin part  50   a  is molded integrally with the sheet metal member  50   b  and the magnetic sheet metal  50   c . Parts of the sheet metal member  50   b  are exposed to form the rolling surfaces  30   a  to  30   c  (only the rolling surface  30   b  is shown in  FIG.  5 D ). 
     Although the sheet metal member  20   b  in the first embodiment is formed of magnetic material, the sheet metal member  50   b  is formed of non-magnetic material. On the other hand, the magnetic sheet metal  50   c  is formed of magnetic material. As shown in  FIG.  5 C , the magnetic sheet metal  50   c  is arranged such that the whole movable member  50  is attracted toward the − (negative) side in the z-axis direction. That is, a distance from the magnetic sheet metal  50   c  to the magnets  24  ( 24   g  to  24   l ) on the − (negative) side in the z-axis direction is shorter than a distance from the magnetic sheet metal  50   c  to the magnets  24  ( 24   a  to  240  on the + (positive) side in the z-axis direction. Therefore, the movable member  50  is urged toward the fixed member  28 . 
     Since the sheet metal member  50   b  is a non-magnetic body, the sheet metal member  50   b  is not attracted by the magnets  24 . The urging force is caused by the magnetic sheet metal  50   c , and hence it is unnecessary to arrange the sheet metal member  50   b  at a location remote from the magnets  24  on the + (positive) side in the z-axis direction. If this state is described by referring to the first embodiment (see  FIG.  4 B ), it is unnecessary to make the distance  42  shorter than the distance  41 . Compared with the first embodiment, it is possible to offset the movable member  50  toward the − (negative) side in the z-axis direction without changing the position of the rolling surfaces  30  in the z-axis direction. For example, as shown in  FIG.  5 D , it is possible to reduce the thickness of the movable member  50  by an amount corresponding to an offset amount  51 . Accordingly, it is possible to offset the first yoke  25  and the magnets  24  ( 24   a  to  24   f ) fixed to the first yoke  25  toward the − (negative) side in the z-axis direction. As a result, it is possible to reduce the thickness of the camera-side shake correction unit  14  in the z-axis direction. 
     According to the present embodiment, it is possible to obtain the same advantageous effects as provided by the first embodiment, in forming the strong rolling surfaces  30 , reducing the number of processing steps for forming the rolling surfaces  30 , and increasing the strength of the movable member  50 . Further, it is possible to obtain the urging force using the magnetic sheet metal  50   c  which is a member different from the sheet metal member  50   b , and what is more, since the sheet metal member  50   b  is formed of non-magnetic material, this contributes to size reduction and thinning of the camera-side shake correction unit  14 . 
     An image capture apparatus according to a third embodiment of the present invention will be described with reference to  FIGS.  6 A and  6 B . The present embodiment differs from the first embodiment in the components of the urging mechanism for urging the movable member against the fixed member  28  in the camera-side shake correction unit, and is basically the same in the other components as the first embodiment. Therefore, the description will be mainly given of the different points from the first embodiment. 
       FIG.  6 A  is a view of a camera-side shake correction unit, as viewed from the + (positive) side in the z-axis direction.  FIG.  6 B  is a view showing part of a cross-section taken along E-E in  FIG.  6 A . The image capture apparatus according to the present embodiment includes the camera-side shake correction unit, denoted by reference numeral  60 , which corresponds to the camera-side shake correction unit  14 . 
     The camera-side shake correction unit  60  includes a movable member  61 . The movable member  61  includes a sheet metal member  61   b  and a resin part  61   a , and the resin part  61   a  is molded integrally with the sheet metal member  61   b . The movable member  61 , the resin part  61   a , and the sheet metal member  61   b  correspond to the movable member  20 , the resin part  20   a , and the sheet metal member  20   b  in the first embodiment, respectively. Portions of the sheet metal member  61   b  are exposed to form the rolling surfaces  30  (not shown in  FIGS.  6 A and  6 B ). 
     An urging spring  63  is engaged between the movable member  61  and the fixed member  28 . One end of the urging spring  63  is engaged with a spring hook portion provided  61   c  on the sheet metal member  61   b , and the other end is engaged with a spring hook portion  28   a  provided on the fixed member  28 . The locations on the movable member  61  and the fixed member  28 , where the urging spring  63  is engaged, do not matter. The urging spring  63  is hooked in a tensioned state. Therefore, the movable member  61  and the fixed member  28  are urged in a direction attracted to each other. With this, it is unnecessary to use the sheet metal member for the urging mechanism. Therefore, the sheet metal member  61   b  may be formed of non-magnetic material. 
     According to the present embodiment, it is possible to obtain the same advantageous effects as provided by the first embodiment, in forming the strong rolling surfaces  30 , reducing the number of processing steps for forming the rolling surfaces  30 , and increasing the strength of the movable member  61 . Further, since the movable member  61  and the fixed member  28  are urged by the urging spring  63 , it is possible to simplify the urging mechanism without requiring to be configured such that a magnetic body is used therefor. 
     Note that the urging spring  63  may be provided in addition to the urging mechanism using the magnetic body in the first and second embodiments. 
     A fourth embodiment of the present invention will be described with reference to  FIGS.  7 A to  7 C . The present embodiment differs from the first embodiment in the shape of the sheet metal member of the movable member  20 , and is basically the same in the other components as the first embodiment. Therefore, the description will be mainly given of the different points from the first embodiment. 
       FIG.  7 A  is a view of the camera-side shake correction unit  14 , as viewed from the + (positive) side in the z-axis direction.  FIG.  7 B  is a view showing part of a cross-section taken along F-F in  FIG.  7 A . Further,  FIG.  7 C  is a view showing part of a cross-section of the camera-side shake correction unit  14  in the first embodiment, taken along F-F, as a comparative example. Detailed description of  FIG.  7 C  is omitted. 
     The movable member  20  in the present embodiment includes the resin part  20   a  and a sheet metal member  70 . The sheet metal member  70  corresponds to the sheet metal member  20   b  in the first embodiment, and is formed of a magnetic material. Referring to  FIG.  7 B , the sheet metal member  70  is bent at a bending portion  70   a , and has a step portion formed at the bending portion  70   a  as a boundary. With this step portion, the other area than the area of the rolling surfaces  30  (only  30   b  is shown in  FIG.  7 B ) is closer to the fixed member  28 . In other words, part of the sheet metal member  70  which is opposed to the magnets  24  and used to urge the movable member  20  by magnetic attraction can be made closer to the magnets  24  ( 24   g  to  24   l ) on the − (negative) side in the z-axis direction, compared with the first embodiment. The part of the sheet metal member  70  opposed to the magnets  24 , mentioned here, is the area other than the rolling surfaces  30 , and it is better for the purpose of magnetic attraction that this part is closer to the magnets  24  on the − (negative) side in the z-axis direction. By forming the bending portion  70   a , it is possible to position this part on the − (negative) side in the z-axis direction with respect to a + (positive) side end position of each rolling ball  26  in the z-axis direction. 
     As a result, it is possible to reduce the thickness of the movable member  20  by an amount corresponding to an offset amount  71 , indicated in  FIG.  7 B . Accordingly, it is also possible to offset the first yoke  25  and the magnets  24  ( 24   a  to  24   f ) fixed to the first yoke  25  toward the − (negative) side in the z-axis direction. As a result, it is possible to reduce the thickness of the camera-side shake correction unit  14  in the z-axis direction. 
     According to the present embodiment, it is possible to obtain the same advantageous effects as provided by the first embodiment, in forming the strong rolling surfaces  30 , reducing the number of processing steps for forming the rolling surfaces  30 , and increasing the strength of the movable member  20 . Further, since the sheet metal member  70  is formed with the step (bending portion  70   a ), and the part of the sheet metal member  70 , other than the rolling surfaces  30 , is closer to the fixed member  28  in the direction of the optical axis  4 , this contributes to size reduction and thinning of the camera-side shake correction unit  14 . 
     A fifth embodiment of the present invention will be described with reference to  FIGS.  8 A and  8 B . The present embodiment differs from the first embodiment in the components of the movable member  20 , and is basically the same in the other components as the first embodiment. Therefore, the description will be mainly given of the different points from the first embodiment. 
     In general, a problem is known that if there is fine dust on the image capture device in the image capture apparatus, an image of the dust is included in a photographed image. As a countermeasure for this, a dust removing mechanism is sometimes employed that includes a cover glass provided on an object side of the image capture device and conveys and removes fine dust by vibrating the cover glass. In the present embodiment, this dust removing mechanism is employed. 
       FIG.  8 A  is a view of a movable member  801 , as viewed from the +(positive) side in the z-axis direction.  FIG.  8 B  is a cross-sectional view taken along J-J in  FIG.  8 A . Note that the same component elements as those of the first embodiment are denoted by the same reference numerals. The movable member  801 , a resin part  801   a , and a sheet metal member  801   b  correspond to the movable member  20 , the resin part  20   a , and the sheet metal member  20   b  in the first embodiment, respectively. 
     The movable member  801  includes a piezoelectric element  802 , a vibration member  803 , and an electrically conductive member  804 . The vibration member  803  is a member in which vibrations are excited by the piezoelectric element  802 . The piezoelectric element  802  is fixed to the vibration member  803 . The vibration member  803  is arranged such that it covers the whole area of the image capture device  6  from the object side of the image capture device  6  in the direction of the optical axis  4  (opposite side from the fixed member  28  in the direction of the optical axis  4 ). The vibration member  803  is a cover member which has the same function as the cover glass of the above-described dust removing mechanism. That is, the vibration member  803  plays a role of preventing attachment of fine dust to the image capture device  6 . The vibration member  803  is vibrated by the piezoelectric element  802 , whereby it is possible to remove fine dust attached to the vibration member  803 . 
     The electrically conductive member  804  places the piezoelectric element  802  and the vibration member  803  in a state fixed to the resin part  801   a , and has a function of electrically connecting the piezoelectric element  802  and the vibration member  803  to the sheet metal member  801   b . An electrical conduction screw  805  as a fastening member is electrically conductive and electrically connects between the electrically conductive member  804  and the sheet metal member  801   b . The sheet metal member  801   b  has an electrically conductive connection portion  801   c . The electrically conductive connection portion  801   c  is formed e.g. by bending or burring the sheet metal member  801   b  such that its height in the direction of the optical axis  4  is secured. The electrically conductive connection portion  801   c  is formed with a female screw into which a male screw of the electrical conduction screw  805  is screwed. 
     The male screw of the electrical conduction screw  805  is screwed into the female screw of the electrically conductive connection portion  801   c  of the sheet metal member  801   b  via the resin part  801   a , whereby the electrically conductive member  804  is fixed to the resin part  801   a  and the sheet metal member  801   b  together with the piezoelectric element  802  and the vibration member  803 . Further, the electrical conduction screw  805  and the electrically conductive connection portion  801   c  are brought into contact with each other, whereby the vibration member  803  is electrically connected to the sheet metal member  801   b  via the electrically conductive member  804 . 
     Incidentally, in general, it is known that the piezoelectric element generates static electricity due to its property of repeating expansion and compression at high speed. This causes a problem that the static electricity attracts fine dust around the piezoelectric element. To solve this problem, there is a conventionally known configuration for removing static electricity generated in the piezoelectric element, in which an electrically conductive member is provided around the piezoelectric element and the electrically conductive member is connected to a large metallic member. The present embodiment employs this configuration. 
     As described above, in the present embodiment, the movable member  801  is formed by integrally molding the resin part  801   a  with the sheet metal member  801   b . Therefore, it is preferable to provide the electrically conductive member  804  around the piezoelectric element  802  and electrically connect the electrically conductive member  804  to the sheet metal member  801   b . For this reason, the electrically conductive member  804  is formed into a shape surrounding the piezoelectric element  802 , as viewed from the direction of the optical axis  4 . Further, the electrically conductive member  804  and the sheet metal member  801   b  are connected at the electrically conductive connection portion  801   c  via the electrical conduction screw  805 . This makes it possible to eliminate static electricity generated in the piezoelectric element  802 . 
     According to the present embodiment, it is possible to obtain the same advantageous effects as provided by the first embodiment, in forming the strong rolling surfaces  30 , reducing the number of processing steps for forming the rolling surfaces  30 , and increasing the strength of the movable member  801 . 
     Further, even in a case where the piezoelectric element  802  and the vibration member  803  are provided to remove fine dust, it is possible to eliminate static electricity by electrically connecting between the electrically conductive member  804  and the sheet metal member  801   b.    
     Next, a sixth embodiment of the present invention will be described. Although in the first to fifth embodiments, the image blur correction device is applied to the camera body  1 , in the sixth embodiment of the present invention, the image blur correction device is applied to the lens barrel  2 . More specifically, the present invention is applied to the lens-side shake correction unit  13   a  (see  FIGS.  1 A and  1 B ). 
       FIG.  9 A  is a view of the lens-side shake correction unit  13   a , as viewed from the + (positive) side in the z-axis direction.  FIGS.  9 B and  9 C  are cross-sectional views taken along G-G and H-H in  FIG.  9 A , respectively. 
     A movable member  80  includes a resin part  80   a  and a sheet metal member  80   b . The resin part  80   a  is molded integrally with the sheet metal member  80   b . The shake correction lens  3   a  is fixed to the movable member  80  and can be displaced in accordance with driving of the movable member  80 . The movable member  80  includes coils  81  ( 81   a  and  81   b ), position detection sections  82  ( 82   a  and  82   b ), magnets  83  ( 83   a  to  83   h ), a yoke  84 , rolling balls  85 , a fixed member  86 , an adhesive  88 , rolling surfaces  89  ( 89   a ,  89   b  and  89   c ), and an optical axis urging spring  87  for holding the movable member  80  at the center of the optical axis  4 . The coils  81 , the position detection sections  82 , the magnets  83 , and the yoke  84  of the movable member  80  correspond to the coils  21 , the position detection sections  22 , the magnets  24 , and the first yoke  25  of the movable member  20  (see  FIG.  4 B  and the like), respectively. The rolling balls  85 , the fixed member  86 , the adhesive  88 , and the rolling surfaces  89  of the movable member  80  correspond to the rolling balls  26 , the fixed member  28 , the adhesive  40 , and the rolling surfaces  30  of the movable member  20 , respectively. 
     In the movable member  80 , the position detection sections  82  ( 82   a  and  82   b ) are provided in association with the coils  81  ( 81   a  and  81   b ). The movable member  80  includes the eight magnets  83  formed by a group of the magnets  83   a ,  83   b ,  83   e , and  83   f  which are arranged in an opposed relation to the coil  81   a , and a group of the magnets  83   c ,  83   d ,  83   g , and  83   h  which are arranged in an opposed relation to the coil  81   b . By energizing the coils  81  arranged in magnetic circuits generated by these magnets  83 , the movable member  80  receives the Lorentz force, whereby it is translationally movable in the x-axis direction and the y-axis direction. 
     Each rolling surface  89  is part of the sheet metal member  80   b  exposed from the resin part  80   a  of the movable member  80  and is brought into contact with the rolling ball  85 . The rolling surfaces  89  are provided at three locations (rolling surfaces  89   a ,  89   b , and  89   c ). Further, as is clear from  FIGS.  9 A and  9 B , the sheet metal member  80   b  is arranged such that it surrounds the shake correction lens  3   a  as the optical element, as viewed from the direction of the optical axis  4 . This increases the strength of the movable member  80 . Further, a bonding surface of the movable member  80 , bonded to the shake correction lens  3   a  with the adhesive  88 , is formed by the resin part  80   a.    
     As shown in  FIG.  9 B , the rolling balls  85  are arranged on the − (negative) side in the z-axis direction of the movable member  80 . Therefore, it is preferable that the movable member  80  is urged toward the − (negative) side in the z-axis direction. To this end, similar to the first embodiment, the urging mechanism using magnetism of the sheet metal member  80   b  is provided. Here, reference numeral  91  in  FIG.  9 C  indicates a distance from the sheet metal member  80   b  to the magnets  83   e  to  83   h  in the direction of the optical axis  4 . Reference numeral indicates a distance  92  from the sheet metal member  80   b  to the magnets  83   a  to  83   d . The distance  92  is shorter than the distance  91 . Therefore, the attraction force applied to the sheet metal member  80   b  is stronger on the − (negative) side in the z-axis direction than on the + (positive) side in the z-axis direction, and as a result, the movable member  80  is urged toward the fixed member  86 . 
     According to the present embodiment, in the lens-side shake correction unit  13   a  of the lens barrel  2 , it is possible to obtain the same advantageous effects as provided by the first embodiment, in forming the strong rolling surfaces  89 , reducing the number of processing steps for forming the rolling surface  89 , and increasing the strength of the movable member  80 . 
     Note that at least one of the characteristic features of the image blur correction device applied to the camera body  1 , described as the second to fifth embodiments, may be employed in the image blur correction device applied to the lens barrel  2  of the present embodiment. Further, two or more of the first to fifth embodiments may be appropriately combined, insofar as no inconsistency occurs when realizing the combination. 
     Note that when considering an object to which the present invention is applied, the camera body  1  having the image blur correction function may be regarded as the “image capture apparatus”. Further, the present invention may be applied to both of the image blur correction devices of the camera body  1  and the lens barrel  2 . 
     Note that in the above-described embodiments, the image blur correction function is provided in both of the camera body  1  and the lens barrel  2 . In a case where the present invention is applied to the camera body  1  as a single unit, the camera-side shake correction unit  14  is needed. In a case where the present invention is applied to the lens barrel  2  as a single unit, the lens-side shake correction unit  13   a  is needed. However, in a case where the present invention is applied to a lens-integrated type image capture apparatus, the image blur correction function may be provided in at least one of the camera body  1  and the lens barrel  2 . 
       FIG.  10 A  is a cross-sectional view of an image capture apparatus to which an image blur correction device according to a seventh embodiment of the present invention is applied.  FIG.  10 B  is a block diagram showing an electrical configuration of the image capture apparatus, denoted by reference numeral  1000 ′. Component elements in the present embodiment, corresponding to those of the first embodiment described with reference to  FIGS.  1 A and  1 B , are denoted by the same reference numerals. This image capture apparatus  1000 ′ is formed by a camera body  1001 , and a lens barrel  1002 . The lens barrel  1002  is removable from the camera body  1001  and the image capture apparatus  1000 ′ is a so-called lens interchangeable camera. Note that the camera body  1001  and the lens barrel  1002 , which are fixed to each other and cannot be removed from each other, may be regarded as the image capture apparatus, and the present invention can be applied to this image capture apparatus. 
     The lens barrel  1002  includes the photographing optical system  3 , the lens system controller  12 , and the lens drive section  13 . The photographing optical system  3  is formed by a plurality of lenses. The lens drive section  13  is capable of driving the focus lens, the shake correction lens, the diaphragm, and so forth. 
     The camera body  1001  includes the camera system controller  5 , the image processor  7 , the memory section  8 , the display section  9 , the operation detection section  10 , a shake detection section  15 ′, an anti-vibration mechanism  114 , an image capture device package  6 ′, a shutter mechanism  116 , and the electric contact  11 . The image capture device package  6 ′ includes an image sensor  6   a  (see  FIG.  12 A ) as an image capture device that photoelectrically converts an optical image formed through the lens barrel  1002 . The display section  9  includes the rear-side display device  9   a  provided on the rear side of the camera body  1001  and the EVF (electronic viewfinder)  9   b  provided within the finder of the camera body  1001 . The operation detection section  10  detects signals output from an operation section including a shutter release button, not shown, and so forth. The electric contact  11  is for communication between the camera body  1001  and the lens barrel  1002 . 
     The shake detection section  15 ′ is formed by a plurality of inertial sensors, and is capable of detecting displacement of the camera body  1001 , such as movement and rotation. More specifically, the shake detection section  15 ′ is formed by an accelerometer, a vibrating gyroscope, and so forth. The anti-vibration mechanism  114  is a mechanism for translationally moving the image capture device package  6 ′ within a plane orthogonal to the optical axis  4  (photographing optical axis) of the photographing optical system  3 , and rotating the same about the optical axis  4 . Details of the structure of the anti-vibration mechanism  114  will be described hereinafter. A shake correction unit is formed by the anti-vibration mechanism  114 , the shake-detection section  15 ′, and the camera system controller  5  that controls these components. 
     The image capture apparatus  1000 ′ formed by the camera body  1001  and the lens barrel  1002  includes an image capture unit, an image processing unit, a recording/reproduction unit, and a control unit. The image capture unit mentioned here includes the photographing optical system  3 , the image capture device package  6 ′, and the shutter mechanism  116 . The image processing unit includes the image processor  7 . Further, the recording/reproduction unit includes the memory section  8  and the display section  9 . The control unit includes the camera system controller  5 , the operation detection section  10 , the lens system controller  12 , the lens drive section  13 , the anti-vibration mechanism  114 , and the shake detection section  15 ′. 
     The above-mentioned image capture unit is an optical processing system configured to form through the photographing optical system  3  an image of light from an object on an image plane of the image capture device package  6 ′. A focus evaluation amount and a proper exposure amount can be obtained from the image capture device package  6 ′ and the photographing optical system  3  is properly adjusted based on signals thereof, whereby the image capture device package  6 ′ is exposed to an object light with a proper light amount to form an object image at or in the vicinity of the image capture device package  6 ′. 
     The shutter mechanism  116  controls running of a shutter curtain to thereby control whether or not to cause the object image to reach the image capture device package  6 ′. The shutter mechanism  116  includes at least a curtain (mechanical rear curtain) for shielding an object image, and exposure is completed by the operation of the shutter mechanism  116 . The camera body  1001  has a mode (electronic front curtain mode) in which the timing of starting exposure is controlled by the image capture device package  6 ′ resetting charges on a line-by-line basis before running the rear curtain of the shutter mechanism  116 . The camera body  1001  performs, in the electronic front curtain mode, exposure control by causing the electronic front curtain of the image capture device package  6 ′ for resetting charge and the rear curtain of the shutter mechanism  116  to operate in synchronism with each other. A lot of prior arts related to the electronic front curtain have already been disclosed and hence description thereof is omitted. 
     The image processor  7  incorporates an analog-to-digital converter, a white balance adjustment circuit, a gamma correction circuit, an interpolation calculation circuit, and so forth, and is capable of generating an image for recording. A color interpolation processor is included in the image processor  7 , and generates a color image by performing color interpolation (demosaicing) on Bayer signals. Further, the image processor  7  compresses a still image, a moving image, sound, and so forth, using a predetermined method. 
     The memory section  8  includes a storage medium. The camera system controller  5  outputs an image to the memory section  8 , and displays an image to be presented to a user on the display section  9 . The camera system controller  5  generates and outputs a timing signal, and so forth, for use in image capture. The camera system controller  5  controls the image capture system, the image processing system, and the recording and reproduction system, in response to an external operation. For example, when it is detected by the operation detection section  10  that the shutter release button, not shown, has been pressed, the camera system controller  5  controls driving of the image capture device  6 , the operations of the image processor  7 , including compression processing, and so forth. Further, the camera system controller  5  controls the state of each segment on the display section  9 . Note that the rear-side display device  9   a  is implemented by a touch panel and is connected to the operation detection section  10 . 
     The operation for adjusting the optical system will be described. The image processor  7  is connected to the camera system controller  5 , and the camera system controller  5  determines an appropriate focus position and a diaphragm position based on signals output from the image capture device package  6 ′. More specifically, the camera system controller  5  performs photometry and ranging operations based on the signals output from the image capture device package  6 ′, and determines exposure conditions (an F-number, a shutter speed, etc.). The camera system controller  5  sends commands to the lens system controller  12  via the electric contact  11  and the lens system controller  12  properly controls the lens drive section  13 . Further, in a mode for performing shake correction, the camera system controller  5  controls the lens drive section  13  to properly control the shake correction lens based on signals obtained from the image capture device package  6 ′. 
     Further, as described above, the camera system controller  5  and the lens system controller  12  controls the operations of the components of the camera body  1001  and the lens barrel  1002  according to user operations performed on respective operation sections provided on the camera body  1001  and the lens barrel  1002 . With this, it is possible to photograph a still image and a moving image. 
     A brief description will be given of a flow of the shake correction control. As described above, the shake correction unit is formed by the shake detection section  15 ′ that detects a shake, the anti-vibration mechanism  114  that performs the shake correction operation, and the camera system controller  5  that generates an operation target value of the anti-vibration mechanism  114  based on signals output from the shake detection section  15 ′ and controls the driving of the anti-vibration mechanism  114 . The operation detection section  10  detects a user operation of half-pressing the shutter release button, not shown, to start a photographing preparation operation. This photographing preparation operation is a so-called aiming operation for determining the composition. In the photographing preparation operation, to make it easy to determine the composition, the camera system controller  5  performs an anti-vibration operation using the anti-vibration mechanism  114 . More specifically, the camera system controller  5  realizes anti-vibration by properly controlling the anti-vibration mechanism  114  based on signals output from the shake detection section  15 ′. After that, the operation detection section  10  detects a user operation of fully pressing the shutter release button to start the photographing operation. In the photographing operation, to suppress blur of an object image acquired by the exposure operation, the camera system controller  5  performs the anti-vibration operation using the anti-vibration mechanism  114 . When a certain time period has elapsed after the exposure operation, the anti-vibration operation is stopped. 
       FIG.  11    is an exploded perspective view of a mechanism for correcting a shake, which is included in the anti-vibration mechanism  114 . Although the anti-vibration mechanism  114  has an electric mechanism additionally provided for execution of control, the electric mechanism is omitted from illustration. Referring to  FIG.  11   , a direction alone vertical dashed-dotted lines is parallel to the optical axis  4 . The description is given defining the direction of the optical axis  4  (photographing optical axis direction) as the z-axis direction. The + (positive) side in the z-axis direction is the object side. 
     A member group not displaced in shake correction is a fixed unit  100 , and in  FIG.  11   , component elements of the member group which are not displaced are denoted by reference numerals in  100   s . A member group displaced in shake correction is a movable unit  200 , and in  FIG.  11   , component elements of the member group which are displaced are denoted by reference numerals in  200   s . Further, rolling members sandwichingly held between the fixed unit  100  and the movable unit  200  are balls  301  ( 301   a ,  301   b , and  301   c ). 
     The anti-vibration mechanism  114  includes an upper yoke  101 , screws  102  ( 102   a ,  102   b , and  102   c ), upper magnets  103  ( 103   a ,  103   b ,  103   c ,  103   d ,  103   e , and  103   f ), and auxiliary spacers  104  ( 104   a  and  104   b ). Further, the anti-vibration mechanism  114  includes main spacers  105  ( 105   a ,  105   b , and  105   c ), fixed unit rolling plates  106  ( 106   a ,  106   b , and  106   c ), and lower magnets  107  ( 107   a ,  107   b ,  107   c ,  107   d ,  107   e , and  107   f ). Further, the anti-vibration mechanism  114  includes a lower yoke  108 , screws  109  ( 109   a ,  109   b , and  109   c ), a base plate  110 , an FPC (flexible circuit board)  201 , a movable PCB (electric wiring board)  203 , and movable unit rolling plates  204  ( 204   a ,  204   b , and  204   c ). Further, the anti-vibration mechanism  114  includes coils  205  ( 205   a ,  205   b , and  205   c ), a movable frame  206  (holding member), and the balls  301   a ,  301   b , and  301   c.    
     The upper yoke  101 , the upper magnets  103 , the lower magnets  107 , and the lower yoke  108  form magnetic circuits, and these components form so-called closed magnetic circuits. The upper magnets  103  are fixedly bonded to the upper yoke  101  in an attracted state. Similarly, the lower magnets  107  are fixedly bonded to the lower yoke  108  in an attracted state. The upper magnets  103  and the lower magnets  107  are each magnetized in the direction of the optical axis  4  (vertical direction, as viewed in  FIG.  11   ). The magnets adjacent to each other (such as the upper magnet  103   a  and the upper magnet  103   b , and magnets having the same positional relationship as these) of the upper magnets  103  and the lower magnets  107  are magnetized in directions different from each other. Further, the magnets, opposed to each other (such as the upper magnet  103   a  and the lower magnet  107   a , and magnets having the same positional relationship as these) are magnetized in the same direction. By magnetizing the magnets as described above, a strong magnetic flux density is generated in the optical axis direction between the upper yoke  101  and the lower yoke  108 . 
     Since a strong attraction force is generated between the upper yoke  101  and the lower yoke  108 , a proper space is secured between the upper yoke  101  and the lower yoke  108  by the main spacers  105  and the auxiliary spacers  104 . The proper space mentioned here is a space which makes it possible to arrange the coils  205  and the FPC  201  between the upper magnets  103  and the lower magnets  107 , and secure a proper gap. The main spacers  105  are each formed with a screw hole, and the upper yoke  101  is fixed to the main spacers  105  by the corresponding screws  102 . Rubber is arranged on a body portion of each main spacer  105 , and this rubber functions as a regulating portion (so-called stopper) when the movable unit  200  is displaced 
     The base plate  110  is formed with openings such that the lower magnets  107  can be received therein and the surfaces of the lower magnets  107  protrude from these openings. Each lower magnet  107  is thicker than the base plate  110 . When the base plate  110  and the lower yoke  108  are fixed by the screws  109 , the lower magnets  107 , lamer in the dimension in the thickness direction than the base plate  110 , protrude from the base plate  110  toward the + (positive) side in the z-axis direction. 
     The movable frame  206  is formed of resin containing a large amount of a plasticizer and is light in weight and high in rigidity. Further, the movable frame  206  has a low linear expansion coefficient. The linear expansion coefficient will be explained hereinafter with reference to  FIGS.  12 A to  12 C . The movable unit  200  is formed by fixing a plurality of component elements to the movable frame  206 . The FPC  201  has position detection elements, disposed on a surface on a side hidden in  FIG.  11    (the − (negative) side in the z-axis direction), at respective locations indicated by mounting positions  202   a ,  202   b , and  202   c . Each position detection element employs e.g. a Hall element so as to make it possible to perform position detection using the above-mentioned magnetic circuit. The Hall element is small-sized, and hence the position detection elements are arranged in a state nested within the coils  205   a ,  205   b , and  205   c , respectively. 
     The movable PCB  203  forms part of the image capture device package  6 ′, as described hereinafter. Further, the coils  205  and the above-mentioned position detection elements are connected to the movable PCB  203 . Electrical communication is performed with the outside via a connector on the movable PCB  203 . The fixed unit rolling plates  106  are fixedly bonded to the base plate  110 . The movable unit rolling plates  204  are fixedly bonded to the movable frame  206 . The fixed unit rolling plates  106  and the movable unit rolling plates  204  form the rolling surfaces of the balls  301 . The movable unit  200  is displaced relative to the fixed unit  100  via the balls  301 . The movable unit  200  and the fixed unit  100  are brought into contact with each other via the balls  301 , and hence an external force applied to the movable unit  200  and distortion generated in the movable unit  200  are not transmitted to the fixed unit  100 . That is, even when distortion is generated in the movable unit  200 , distortion is not generated in the fixed unit  100 . Further, even when distortion is generated due to temperature change in the members, such as the image capture device package  6 ′, which are in contact with the movable unit  200 , the generated distortion is transmitted only up to the movable frame  206 . Therefore, to cope with occurrence of thermal stress due to temperature change in the image capture device package  6 ′, it is only required to pay attention to the linear expansion coefficients of the components in a range from the image capture device package  6 ′ to the movable frame  206 . Note that since the rolling plates are additionally or separately provided, it is easy to design the surface roughness and hardness of the rolling plates in a preferable state. 
     By causing electric current to flow through the coils  205  in the above-mentioned magnetic circuit, the coils  205  receive the Lorentz force, whereby the movable unit  200  can be displaced. Further, the camera system controller  5  can perform feedback control using signals output from the position detection elements. The camera system controller  5  properly controls the values of signals of the position detection elements, whereby it is possible to translationally move the movable frame  206  within a plane orthogonal to the optical axis  4  and rotate the same about the optical axis. Further, it is possible to generate a rotational motion of the movable frame  206  substantially about the optical axis  4 , by driving the signals of the position detection elements disposed at the mounting positions  202   b  and  202   c  in opposite phase while maintaining a signal of the position detection element disposed at the mounting position  202   a  to a fixed value. 
     The magnetic flux density in the optical axis direction is detected at each mounting position  202 . The magnetic circuits formed by the upper magnets  103 , the lower magnets  107 , and so forth, generally have non-linear characteristics. Therefore, the magnetic flux densities detected at the mounting positions  202  do not necessarily have a fixed resolution in the whole driving range, in other words, the detection resolution varies with the position. This is because there are positions where the magnetic flux density rapidly changes and positions where the magnetic flux density moderately changes, and the amount of change of the magnetic flux density with respect to the movement amount is larger at the position where the magnetic flux density more rapidly changes, resulting in a higher detection resolution. In the magnetic circuits in the anti-vibration mechanism  114  shown in  FIG.  11   , a boundary position between the magnets (such as a boundary position between the upper magnet  103   a  and the upper magnet  103   b ) has the largest change in magnetic flux density and hence the highest detection resolution. 
       FIGS.  12 A and  12 B  are schematic cross-sectional views of the image capture device package  6 ′ and the movable frame  206 . The movable frame  206  is a holding member for holding the image capture device package  6 ′.  FIG.  12 A  and  FIG.  12 B  differ from each other in the form of adhesion between the movable frame  206  and the image capture device package  6 ′. Although the present embodiment employs the form of adhesion shown in  FIG.  12 A , the form of adhesion shown in  FIG.  12 B  may be employed.  FIG.  12 C  is a cross-sectional view schematically showing a state of distortion of the image capture device package  6 ′, caused in a case where there are differences in linear expansion coefficient between the components within the image capture device package  6 ′. 
     As shown in  FIG.  12 A , the image capture device package  6 ′ includes the image sensor  6   a , a glass lid  6   b , an image capture device-holding frame  6   c , and the movable PCB  203 . The image capture device package  6 ′ and the movable frame  206  are fixedly bonded to each other with an adhesive  40 ′. Particularly, in the illustrated example in  FIG.  12 A , the movable PCB  203  as the component of the image capture device package  6 ′ and the movable frame  206  are bonded to each other. In the illustrated example in  FIG.  12 B , the image capture device-holding frame  6   c  as the component of the image capture device package  6 ′ and the movable frame  206  are bonded to each other. 
     In the movable unit  200 , a surface bonded to the image capture device package  6 ′ with the adhesive  40 ′ is formed of resin. A reason for this will be described. In general, when bonding components with an adhesive, it is necessary to provide a place where the adhesive is applied (hereinafter referred to as the adhesive pool). In general, the same image capture device can be used for a lot of models, but on the other hand, the movable member  20  is designed on a model-by-model basis, and hence the adhesive pool is also designed on a model-by-model basis. For this reason, to make it possible to freely arrange the adhesive pool with a higher degree of freedom in shape, it is preferable that the bonding surface is formed by a resin. 
     Further, when the camera body  1  is exposed to a high-temperature or low-temperature environment, if a difference in the linear expansion coefficient is large between an outer periphery portion of the image capture device  6 ′, as one bonding surface, and part of the movable member  200 , as the other bonding surface, the image capture device  6 ′ and the movable member  200  may warp in a direction opposite to each other. This is caused by occurrence of thermal distortion. Thus, if the image capture device  6 ′ warps from the movable member  200 , a problem is caused that the image capture device  6 ′ tilts with respect to the optical axis  4  and hence tilts with respect to the image plane of the camera body  1001 , which may cause blur in part of a photographed image. One solution for this problem is that the linear expansion coefficient of the bonding surface of the movable member  200 , bonded to the image capture device  6 , and the linear expansion coefficient of the bonding surface of the image capture device  6 ′ are made closer to each other. In the present embodiment, the linear expansion coefficients of the bonding surfaces are set taking this into consideration. 
     First, in the illustrated example in  FIG.  12 A , part (surface on the − (negative) side in the z-axis direction) of the movable PCB  203  of the image capture device package  6 ′, which is in contact with the adhesive  40 ′, is a first adhesion interface B 1 . Therefore, the part forming the first adhesion interface B 1  is part of the movable PCB  203 . Further, part (inside surface) of the movable frame  206  of the movable unit  200 , which is in contact with the adhesive  40 ′, is a second adhesion interface B 2 . Therefore, the part forming the second adhesion interface B 2  is part of the movable frame  206 . 
     On the other hand, in the illustrated example in  FIG.  12 B , part (surface on the − (negative) side in the z-axis direction) of the image capture device-holding frame  6   c  of the image capture device package  6 ′, which is in contact with the adhesive  40 ′, is the first adhesion interface B 1 . Therefore, the part forming the first adhesion interface B 1  is part of the image capture device-holding frame  6   c  which is a resin member. Further, similar to the illustrated example in  FIG.  12 A , part of the movable frame  206  of the movable unit  200 , which is in contact with the adhesive  40 ′, is the second adhesion interface B 2 . Therefore, the part forming the second adhesion interface B 2  is part of the movable frame  206 . 
     Deformation (warp) of the image capture device package  6 ′ as a single unit, caused due to temperature change, will be described with reference to  FIG.  12 C . If the linear expansion coefficient is largely different between the image sensor  6   a , the glass lid  6   b , the image capture device-holding frame  6   c , and the movable PCB  203 , which are the components of the image capture device package  6 ′, distortion is sometimes caused in the image capture device package  6 ′ due to temperature change. For example, a warp, similar to a warp of so-called bimetal is sometimes caused. 
       FIG.  12 C  shows an example of deformation caused in a case where the linear expansion coefficient of the movable PCB  203  is larger than that of the glass lid  6   b  and the temperature rises. The movable PCB  203  extends more than the glass lid  6   b  due to increase in temperature, and hence such a warp as shown in  FIG.  12 C  is generated. As a result, distortion is caused on the surface of the image sensor  6   a , which makes it difficult to accurately adjust the focus. To suppress this phenomenon, materials whose linear expansion coefficients are close to each other are often selected for the components of the image capture device package  6 ′. 
     The image sensor  6   a  is made of silicon single crystal, and hence its linear expansion coefficient is small, and is approximately 2.6×10 −6 /K at normal temperature. This value is smaller by approximately one digit, compared with metal, such as aluminum (approximately 23.1×10 −6 /K), magnesium (approximately 24.8×10 −6 /K), and stainless steel (SUS304: approximately 17.8×10 −6 /K). Therefore, a circuit board material having a low linear expansion coefficient is employed for the movable PCB  203 . A material having a linear expansion coefficient in a range of approximately 2×10 −6 /K to 5×10 −6 /K can be used for a circuit board using glass cloth having a low linear expansion coefficient. Similarly, a material having a low linear expansion coefficient is employed for the Mass lid  6   b  as well. For example, so-called Pyrex (registered trademark) glass having a low linear expansion coefficient of approximately 3×10 −6 /K is employed. 
     A so-called low linear expansion resin for package or the like is employed for the image capture device-holding frame  6   c . Examples of the material include one formed by filling epoxy with plasticizer at a high rate, and the material having a linear expansion coefficient of approximately 10×10 −6 /K is provided. As in the above-described example, it is possible to suppress warp or the like, caused by temperature change, by using materials each having a low linear expansion coefficient, for the components forming the image capture device package  6 ′. This reduces the phenomenon that the image plane is bent and the focus on the whole screen cannot be adjusted. 
     However, if the linear expansion coefficient is largely different between the image capture device package  6 ′ and the movable frame  206 , the adhesive  40 ′ is deformed when the temperature has change, and thermal stress is caused in the adhesive  40 ′ and the adhesion interface. If the camera body  1001  is exposed to a condition that the temperature rapidly changes, the bonding surfaces can be peeled. Polycarbonate as resin generally used for a lot of image capture apparatuses mostly has a linear expansion coefficient of approximately 50×10 −6 /K. Even a polycarbonate composition formed by filling glass has a linear expansion coefficient in a range of approximately 20×10 −6 /K to 40×10 −6 /K. As described hereinafter, resin having a linear expansion coefficient in a range of approximately 17×10 −6 /K to 24×10 −6 /K is employed for the movable frame  206 . In general, the resin material tends to be reduced in shock resistance when the linear expansion coefficient is reduced and plasticizer is filled at a high rate. That is, if the material is selected only from the viewpoint of the linear expansion coefficient, there is a fear that a crack is caused in the movable frame  206  when the image capture apparatus is dropped. 
     To prevent this, in the present embodiment, the linear expansion coefficients of the components are set such that the linear expansion coefficient is gradually increased in an order from the silicon having a low linear expansion coefficient (image sensor  6   a ) to the movable frame  206 . The order of stepwise increase in the magnitude of the linear expansion coefficient in this case is expressed by using the inequality of (image sensor  6   a )&lt;(part forming the first adhesion interface B 1 )&lt;(part forming the second adhesion interface B 2 )&lt;(aluminum alloy or magnesium alloy). 
     That is, the linear expansion coefficient of the part forming the first adhesion interface B 1  (the part of the movable PCB  203  in the example in  FIG.  12 A  and the part of the image capture device-holding frame  6   c  in the example in  FIG.  12 B ) is larger than the linear expansion coefficient of the image sensor  6   a . Further, the part forming the second adhesion interface B 2  (part of the movable frame  206 ) is formed of resin. What is more, the linear expansion coefficient of the part forming the second adhesion interface B 2  (part of the movable frame  206 ) is larger than the linear expansion coefficient of the part forming the first adhesion interface B 1  (the part of the movable PCB  203  in the example in  FIG.  12 A  and the part of the image capture device-holding frame  6   c  in the example in  FIG.  12 B ). Further, the linear expansion coefficient of the part forming the second adhesion interface B 2  (the part of the movable frame  206 ) is smaller than the linear expansion coefficient of any of the aluminum alloy and the magnesium alloy. 
     By arranging the components such that the linear expansion coefficient is gradually increased from the image sensor  6   a  to the movable frame  206  in the order expressed by the above inequality, a difference of the linear expansion coefficient between each adjacent components becomes small, compared with a case where the components are arranged in a disorderly manner. As a result, it is possible to suppress thermal stress caused due to a difference of the linear expansion coefficient between the fixed components adjacent to each other, and reduce the influence caused by temperature change without extremely narrowing the range of choices of the material. Further, since the linear expansion coefficient of the part forming the second adhesion interface B 2  is smaller than the linear expansion coefficient of any of the aluminum alloy and magnesium alloy, it is possible to reduce thermal stress more than in a case where the aluminum alloy or the magnesium alloy, which is a general material of the movable frame, is used. 
     Examples of the resin material of the movable frame  206 , satisfying the above inequality, include TORELINA A310MX04 (registered trademark), manufactured by Toray Industries, Inc. This resin contains PPS, epoxy, or nylon, as a base resin. In this resin, the linear expansion coefficient is suppressed to a range of approximately 17×10 −6 /K to 24×10 −6 /K by highly filling plasticizer while using PPS as the base resin. Further, this resin satisfies the requirement of the level of the shock resistance for the movable frame. Examples of this resin, which is easy to obtain good characteristics while being highly filled with plasticizer, include PPS, epoxy, or nylon. It is only required to form the movable frame  206  by using a material formed by using any of these resin materials as the base. 
     According to the present embodiment, the components are arranged with the adhesive  40 ′ interposed therein such that the linear expansion coefficient is gradually increased from the image sensor  6   a  to the movable frame  206  in the order expressed by the above-described inequality. This makes it possible to suppress occurrence of thermal stress on the adhesion interface, caused due to temperature change, and thereby enhance the reliability of the image blur correction function. 
     Further, the balls  301  are sandwichingly held between the movable unit  200  and the fixed unit  100 , and the fixed unit  100  holds the movable unit  200  via the balls  301  such that it is relatively displaceable. With this, even when distortion is caused in the movable unit  200  due to temperature change, the distortion is not transmitted to the fixed unit  100  and is hard to adversely affect the fixed unit  100 . In this point as well, it is also possible to enhance the reliability of the image blur correction function. 
     Next, an eighth embodiment of the present invention will be described. In the eighth embodiment, the movable frame  206  is formed by a sheet metal member and a resin part molded integrally with the sheet metal member. The present embodiment differs from the first embodiment in the construction of the movable frame  206  and the form of adhesion between the movable frame  206  and the image capture device package  6 ′, and is the same in the other components as the first embodiment. 
       FIG.  13 A  is a view of the anti-vibration mechanism  114 , as viewed from the optical axis direction.  FIG.  13 B  is a cross-sectional view taken along A-A in  FIG.  13 A . The same component elements in  FIGS.  13 A and  13 B  as those of the first embodiment are denoted by the same reference numerals. 
     As shown in  FIG.  13 B , the movable member  206  includes a resin part  206   a  and a sheet metal member  206   b . In the movable member  206 , the resin part  206   a  is molded integrally with the sheet metal member  206   b  such that the resin part  206   a  covers the sheet metal member  206   b . That is, the resin part  206   a  is formed integrally with the sheet metal member  206   b  by insert molding. 
     The balls  301  are arranged on the − (negative) side in the z-axis direction with respect to the movable unit  200 . Therefore, it is preferable that the movable unit  200  is urged toward the − (negative) side in the z-axis direction. In general, in a case where two members are urged to approach each other, it is necessary to additionally provide a member for urging them. However, in the present embodiment, the urging force is obtained by making use of the magnetism of the sheet metal member  206   b  and the lower magnets  107 . 
     The sheet metal member  206   b  is formed by a metallic material having magnetism. Part of the sheet metal member  206   b  is opposed to the upper magnets  103  and the lower magnets  107 , and hence the sheet metal member  206   b  is attracted by the upper magnets  103  and the lower magnets  107  (magnetic attraction). Therefore, whether the movable unit  200  is more strongly magnetically-attracted toward the + (positive) side in the z-axis direction or the − (negative) side in the z-axis direction is determined depending on distances from the sheet metal member  206   b  to the upper magnets  103  and the lower magnets  107  in the z-axis direction. 
     Here, reference numeral  41 ′ in  FIG.  13 B  indicates a distance from the sheet metal member  206   b  to the upper magnets  103   e  and  103   f . Reference numeral  42 ′ indicates a distance from the sheet metal member  206   b  to the lower magnets  107   e  and  107   f . Note that when comparing these distances  41 ′ and  42 ′, the position of the sheet metal member  206   b  is represented by the position of the center of the sheet metal member  206   b  in a direction of the thickness of the sheet metal member  206   b . In the present embodiment, the distance  42 ′ is shorter than the distance  41 ′. Therefore, the attraction force applied to the sheet metal member  206   b  is stronger on the − (negative) side in the z-axis direction than on the + (positive) side in the z-axis direction, and as a result, the movable member  200  is urged toward the base plate  110 . The balls  301  are sandwichingly held by this urging force. The balls  301  are enabled to smoothly roll with less loss caused by friction. 
     In the present embodiment, the sheet metal member  206   b  of the movable frame  206  is covered with the resin part  206   a . If a difference of the linear expansion coefficient between the sheet metal member  206   b  and the image capture device package  6 ′ is large, it is preferable to form the resin part  206   a  using a resin material having a linear expansion coefficient closer to that of the image capture device package  6 ′. Thus, from the viewpoint of the degree of freedom in shape and the viewpoint of the physical properties of the material, it is preferable that the surface of the movable unit  200 , bonded to the image capture device package  6 ′, is formed by the resin part  206   a.    
     For this reason, in the present embodiment, the image capture device package  6 ′ and the resin part  206   a  are bonded with the adhesive  40 ′. Part of the image capture device package  6 ′ (a side surface of the image capture device package  6 ′ including at least a side surface of the image capture device-holding frame  6   c ), which is in contact with the adhesive  40 ′, is a first adhesion interface D 1 . Therefore, the part forming the first adhesion interface D 1  includes part of the image capture device-holding frame  6   c . Further, part (inside surface) of the resin part  206   a  of the movable frame  206 , which is in contact with the adhesive  40 ′, is a second adhesion interface D 2 . Therefore, the part forming the second adhesion interface B 2  includes part of the resin part  206   a.    
     Here, the linear expansion coefficient of each component is considered. Stainless steel or the like is suitable for the sheet metal member  206   b , and the linear expansion coefficient in this case is (SUS304: approximately 17.8×10 −6 /K). The materials of the components of the image capture device package  6 ′ are the same as those used in the first embodiment. As described hereinafter, resin having a linear expansion coefficient of approximately 12×10 −6 /K is used for the movable frame  206 . The linear expansion coefficient of each component is set such that the linear expansion coefficient is gradually increased in an order from the image sensor  6   a  to the movable frame  206 . The order of increase in the magnitude of the linear expansion coefficient in this case is expressed by using the inequality of (image sensor  6   a )&lt;(part forming the first adhesion interface D 1 )&lt;(part forming the second adhesion interface D 2 )&lt;(sheet metal member  206   b ). 
     By arranging the components in the order expressed by the above inequality, it is possible to suppress thermal stress caused by a difference of the linear expansion coefficient between the fixed components, adjacent to each other, and reduce the influence caused by temperature change without extremely narrowing the range of choices of the material. Further, it is possible to reduce thermal stress more than in a case where the sheet metal member  206   b  is bonded without covering the sheet metal member  206   b . Since the sheet metal member  206   b  is formed of metal, a range of choices of the linear expansion coefficient is narrow. However, by forming the second adhesion interface D 2  using the resin part  206   a  of the movable frame  206 , the range of choices of the material is increased. 
     Examples of the material of the resin part  206   a , satisfying the above-mentioned condition, include TORELINA H501 (registered trademark), manufactured by Toray Industries, Inc. In this resin, the linear expansion coefficient is suppressed to approximately 12×10 −6 /K by highly filling plasticizer while using PPS as the base resin. Further, this resin satisfies the requirement of the level of the shock resistance for the movable frame. It is only required to form the movable frame  206  by using a material formed by using this resin as the base, for the resin part  206   a.    
     According to the present embodiment, the components are arranged with the adhesive  40 ′ interposed therein such that the linear expansion coefficient is gradually increased from the image sensor  6   a  to the movable frame  206  in the order expressed by the above inequality. With this, it is possible to obtain the same advantageous effects as provided by the seventh embodiment in suppressing occurrence of thermal stress on the adhesion interface to thereby enhance the reliability of the image blur correction function. Further, it is possible to obtain the same advantageous effects as provided by the seventh embodiment in that distortion caused in the movable unit  200  is hard to be transmitted to the fixed unit  100 . 
     While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions. 
     This application claims the benefit of Japanese Patent Application No. 2018-237496, filed Dec. 19, 2018, No. 2019-116537, filed Jun. 24, 2019, and No. 2019-116536, filed Jun. 24, 2019, which are hereby incorporated by reference herein in their entirety.