Patent Publication Number: US-2023135851-A1

Title: Drive device and imaging apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2021-176871, filed on Oct. 28, 2021. The above application is hereby expressly incorporated by reference, in its entirety, into the present application. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a drive device and an imaging apparatus. 
     2. Description of the Related Art 
     JP2019-102803A discloses a camera module including a semiconductor package using a hall element as a sensor for position detection, in which an effect of a leaking magnetic field on the sensor for position detection is reduced by, for example, arranging the sensor for position detection as far as possible from wiring lines for current supply or offsetting the leaking magnetic field by setting a direction of a flow of current in opposite directions between the pair of wiring lines for current supply. 
     JP2020-170962A discloses a shake correction device that is used in an electronic apparatus comprising an imaging element which outputs an image signal corresponding to an optical image formed through an imaging optical system, and that corrects a shake occurring in an image indicated by the image signal by moving the imaging element in a direction orthogonal to an optical axis of the imaging optical system. 
     JP2018-205585A discloses an optical unit with a shake correction function. The optical unit comprises a fixed body, a movable body that holds an optical element, a support mechanism that supports the movable body in a movable manner with respect to the fixed body, and a shake correction drive mechanism that moves the movable body. The shake correction drive mechanism is a magnetic drive mechanism including a magnet disposed in any one of the movable body or the fixed body, and a drive coil that is disposed in the other of the movable body or the fixed body and exerts electromagnetic force on the movable body within a magnetic field of the magnet. A magnetic detection element that detects displacement of the magnet caused by the electromagnetic force, and a cancelation coil that generates a magnetic flux capable of canceling a magnetic flux exerted on the magnetic detection element from the drive coil are disposed in a member in which the drive coil is disposed out of the movable body and the fixed body. 
     SUMMARY OF THE INVENTION 
     A drive device according to one embodiment of the disclosed technology comprises a magnet, a coil and a position sensor that receive an action from the magnet, a first electrical wiring line that passes through the position sensor and causes first electromotive force to occur by causing a current to flow in the coil, a second electrical wiring line that causes second electromotive force which is electromotive force in an opposite direction to the first electromotive force to occur by causing the current to flow in the coil, and a processor configured to control the current flowing in the coil based on an output of the position sensor. 
     A drive device according to another embodiment of the disclosed technology comprises a magnet, a coil and a position sensor that receive an action from the magnet, an electrical wiring line that passes through the position sensor and extends from an inner side of the coil to an outer side of the coil, and a processor configured to control a current flowing in the coil based on an output of the position sensor, in which electromotive force occurring by the electrical wiring line by causing the current to flow in the coil is less than or equal to a threshold value. 
     An imaging apparatus according to still another embodiment of the disclosed technology comprises the drive device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a diagram illustrating a schematic configuration of a digital camera  1  that is one embodiment of an imaging apparatus according to the present invention. 
         FIG.  2    is a schematic diagram partially illustrating a schematic configuration of an imaging element shift mechanism  13  in the digital camera  1  illustrated in  FIG.  1   . 
         FIG.  3    is a schematic cross-sectional view along arrow A-A in  FIG.  2   . 
         FIG.  4    is a schematic diagram of a movable unit  60  illustrated in  FIG.  2    in a view in a direction Z 2 . 
         FIG.  5    is a schematic diagram that illustrates a first modification example of an electrical wiring line connecting a position sensor  63  to a control unit  18  and corresponds to  FIG.  4   . 
         FIG.  6    is a schematic diagram that illustrates a second modification example of the electrical wiring line connecting the position sensor  63  to the control unit  18  and corresponds to  FIG.  4   . 
         FIG.  7    is a schematic diagram that illustrates a third modification example of the electrical wiring line connecting the position sensor  63  to the control unit  18  and corresponds to  FIG.  4   . 
         FIG.  8    illustrates an exterior of a smartphone  200 . 
         FIG.  9    is a block diagram illustrating a configuration of the smartphone  200  illustrated in  FIG.  8   . 
         FIG.  10    is a schematic diagram that illustrates a configuration example in a case of arranging the position sensor  63  outside a driving coil  62  in the configuration of the electrical wiring line illustrated in  FIG.  7    and corresponds to  FIG.  4   . 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIG.  1    is a diagram illustrating a schematic configuration of a digital camera  1  that is one embodiment of an imaging apparatus according to the present invention. The digital camera  1  comprises a camera body  10  and a lens device  20 . The lens device  20  is attachably and detachably, in other words, interchangeably, configured with respect to the camera body  10 . The lens device  20  may be integrated with the camera body  10 . 
     The lens device  20  includes an imaging optical system  30  and a lens control unit  40 . The imaging optical system  30  comprises an imaging lens  31  and a stop mechanism and the like, not illustrated. For example, the imaging lens  31  is composed of a single lens or a plurality of lenses including a lens for adjusting a focal point of the imaging optical system  30 . The lens control unit  40  is mainly configured with a processor and controls driving of the imaging optical system  30  under control of a control unit  18 , described later. 
     The camera body  10  comprises an imaging element  12 , an imaging element shift mechanism  13 , an imaging element drive unit  14 , a display unit  15  that is a display device such as a liquid crystal display or an organic electro luminescence (EL) display, a memory  16  including a random access memory (RAM) as a volatile memory in which information is temporarily recorded, a read only memory (ROM) as a non-volatile memory in which a program and various information necessary for an operation of the program are recorded in advance, and the like, a vibration detector  17 , the control unit  18 , and a recording medium  19  such as a memory card configured with a non-volatile memory. 
     The imaging element  12  images a subject through the imaging optical system  30 . The imaging element  12  is configured with a charge coupled device (CCD) image sensor, a complementary metal oxide semiconductor (CMOS) image sensor, or the like. 
     The imaging element shift mechanism  13  is a mechanism for preventing a shake (image shake) of an image captured by the imaging element  12  by moving the imaging element  12  in a plane perpendicular to an optical axis K of the imaging optical system  30 . 
     The vibration detector  17  is a sensor for detecting a motion of the digital camera  1 . The vibration detector  17  is configured with, for example, an acceleration sensor or an angular velocity sensor or both thereof. The vibration detector  17  may be disposed in the lens device  20 . 
     The control unit  18  manages and controls the entire digital camera  1 . A hardware structure of the system control unit  18  corresponds to various processors that perform processing by executing programs. 
     The various processors include a central processing unit (CPU) that is a general-purpose processor performing various types of processing by executing a program, a programmable logic device (PLD) that is a processor of which a circuit configuration can be changed after manufacturing like a field programmable gate array (FPGA), or a dedicated electric circuit that is a processor having a circuit configuration dedicatedly designed to execute a specific type of processing like an application specific integrated circuit (ASIC). More specifically, a structure of the various processors is an electric circuit in which circuit elements such as semiconductor elements are combined. The control unit  18  may be configured with one of the various processors or may be configured with a combination of two or more processors of the same type or different types (for example, a combination of a plurality of FPGAs or a combination of a CPU and an FPGA). 
     The control unit  18  causes the imaging element  12  to image the subject by controlling the imaging element drive unit  14  and outputs a captured image signal corresponding to the subject image formed in a light-receiving region of the imaging element  12  from the imaging element  12 . The control unit  18  generates an image of a format such as Joint Photographic Experts Group (JPEG) format reproducible by the digital camera  1  or another apparatus by performing image processing on the captured image signal output from the imaging element  12 . 
     In imaging the subject by the imaging element  12 , the control unit  18  corrects the image shake by controlling the imaging element shift mechanism  13  based on vibration information (angular velocity or the like) of the digital camera  1  detected by the vibration detector  17  to move the imaging element  12  in the plane perpendicular to the optical axis K. 
       FIG.  2    is a schematic diagram partially illustrating a schematic configuration of the imaging element shift mechanism  13  in the digital camera  1  illustrated in  FIG.  1   .  FIG.  3    is a schematic cross-sectional view along arrow A-A in  FIG.  2   . In  FIG.  2   , two directions that are orthogonal to each other and pass through the plane (hereinafter, referred to as an XY plane) perpendicular to the optical axis K of the imaging optical system  30  are illustrated as a direction X and a direction Y. In addition, hereinafter, a direction along the optical axis K will be referred to as a direction Z. One direction (direction from the front to the back of the page in  FIG.  2   ) of the direction Z will be referred to as a direction Z 1 , and the other direction (direction from the back to the front of the page in  FIG.  2   ) of the direction Z will be referred to as a direction Z 2 . 
     The imaging element shift mechanism  13  comprises a fixed unit  50  of which a position in the digital camera  1  is not changed, and a movable unit  60  that can move in the direction X with respect to the fixed unit  50 . While illustration is not provided, the imaging element shift mechanism  13  further includes another fixed unit corresponding to the fixed unit  50  and a movable unit that corresponds to the movable unit  60  and can move in the direction Y with respect to the other fixed unit. 
     The fixed unit  50  comprises a plate-shaped flat member  51  that has a thickness direction matching the direction Z and is parallel to the XY plane, and a magnet  52  and a magnet  53  that extend in the direction Y and are arranged at an interval in the direction X on a surface of the flat member  51  on a direction Z 2  side. The magnet  52  is fixed to the flat member  51  in a state where an N pole faces the direction Z 2  side. The magnet  53  is fixed to the flat member  51  in a state where an S pole faces the direction Z 2  side. 
     The movable unit  60  comprises a support member, not illustrated, that supports the imaging element  12 , and a flexible substrate  61  having a flat surface region that faces the flat member  51  and is parallel to the XY plane. The flexible substrate  61  is fixed to the support member, and moving the flexible substrate  61  in the direction X also moves the imaging element  12  supported by the support member. 
     In  FIG.  2   , the flexible substrate  61  is illustrated as being transparent using an imaginary line for understanding of the configuration. A driving coil  62  for moving the movable unit  60  in the direction X and a position sensor  63  for detecting a position of the movable unit  60  in the XY plane are mounted on a surface of the flat surface region of the flexible substrate  61  on a direction Z 1  side. An axial direction of the driving coil  62  matches the direction Z. The position sensor  63  is arranged on an inner side of the driving coil  62 . The position sensor  63  is configured with a hall element. A magnetic sensor other than a hall element may also be used as the position sensor  63  as long as a position of the movable unit  60  can be detected based on a change in magnetic force supplied from a magnet. 
     As illustrated in  FIG.  2   , the control unit  18  and a driver  11  that performs a supply control of power to the driving coil  62  are further mounted in the flat surface region of the flexible substrate  61 . The control unit  18  and the position sensor  63  are connected by an electrical wiring line, described later, formed in the flexible substrate  61 . The control unit  18  performs an image shake correction control of deciding a target position of the movable unit  60  based on the vibration information detected by the vibration detector  17  and moving the movable unit  60  to the target position by controlling the driver  11  so that the position of the movable unit  60  detected based on an output of the position sensor  63  matches the target position. The control unit  18  and the driver  11  may be mounted on another substrate connected to the flexible substrate  61  through a connector. 
     The driving coil  62 , the magnet  52 , and the magnet  53  constitute a voice coil motor. The flexible substrate  61  can be moved in the direction X with respect to the fixed unit  50  by supplying a current to the driving coil  62  from the driver  11 . The position sensor  63  outputs a signal corresponding to magnetic force from an N pole of the magnet  52  to an S pole of the magnet  53 . Since the magnetic force detected by the position sensor  63  changes depending on a position of the position sensor  63 , the position of the movable unit  60  can be detected based on the output of the position sensor  63 . A magnetic field formed by the magnet  52  and the magnet  53  is configured to act on both of the driving coil  62  and the position sensor  63 . In the present embodiment, size reduction of the imaging element shift mechanism  13  is achieved by performing both of driving of the movable unit  60  and position detection of the movable unit  60  using the common magnet  52  and magnet  53 . 
     A broken line arrow illustrated in  FIG.  3    illustrates a magnetic flux line (hereinafter, referred to as a coil magnetic flux line) that is generated from the driving coil  62  in a case where a current flowing counterclockwise in  FIG.  2    is supplied to the driving coil  62  from the driver  11 . The coil magnetic flux line passing through the flexible substrate  61  advances toward the direction Z 1  on the inner side of an outer edge of the driving coil  62  as illustrated in  FIG.  3   , and advances in the opposite direction toward the direction Z 2  on an outer side of the outer edge of the driving coil  62 . In a case where the current flowing in the driving coil  62  is set in the opposite direction, the coil magnetic flux line is set in the opposite direction. In the present specification, the direction Z is defined as the direction of the coil magnetic flux line passing through the driving coil  62 . 
       FIG.  4    is a schematic diagram of the movable unit  60  illustrated in  FIG.  2    in a view in the direction Z 2 . In  FIG.  4   , the driver  11  is not illustrated. As illustrated in  FIG.  4   , the control unit  18  and the position sensor  63  are connected by an electrical wiring line  64  and an electrical wiring line  65  formed in the flexible substrate  61 . The electrical wiring line  64  and the electrical wiring line  65  are differential output wiring lines of the hall element constituting the position sensor  63 . 
     The electrical wiring line  64  connects one of two differential output terminals of the position sensor  63  to an input terminal T 1  of the control unit  18 . The flexible substrate  61  has a structure of a plurality of layers. For example, the electrical wiring line  64  is formed in the upper most layer. 
     The electrical wiring line  65  connects the other of the two differential output terminals of the position sensor  63  to an input terminal T 2  of the control unit  18 . The electrical wiring line  65  is formed in a layer below the layer in which the electrical wiring line  64  is formed. 
     The electrical wiring line  64  and the electrical wiring line  65  cross at one point P 1  in the plan view illustrated in  FIG.  4   . The electrical wiring line  64  is configured with a wiring line region  64 A between the point P 1  and the position sensor  63  and a wiring line region  64 B between the point P 1  and the input terminal T 1 . The electrical wiring line  65  is configured with a wiring line region  65 A between the point P 1  and the position sensor  63  and a wiring line region  65 B between the point P 1  and the input terminal T 2 . 
     In a state of a view in the direction Z, it can be said that a first loop pattern (pattern forming a closed region L 1 ) that may function as a single-turn coil is formed by the wiring line region  64 A, the wiring line region  65 A, and the position sensor  63  in the flexible substrate  61 . In addition, in a state of a view in the direction Z, it can be said that a second loop pattern (pattern forming a closed region L 2 ) that may function as a single-turn coil is formed by the wiring line region  64 B, the wiring line region  65 B, and the control unit  18  in the flexible substrate  61 . 
     Here, a state that does not occur in actuality and is a state of causing the current to flow to the input terminal T 2  from the input terminal T 1  of the control unit  18  via the position sensor  63  is assumed. In this case, the direction of the current flowing in the first loop pattern is clockwise in  FIG.  4    as illustrated by a broken line arrow in  FIG.  4   . On the other hand, the direction of the current flowing in the second loop pattern is counterclockwise in  FIG.  4    as illustrated by a broken line arrow in  FIG.  4   . In this assumed state, in a case where the direction of the current flowing in each loop pattern is defined as a turn direction of a single-turn coil forming each loop pattern, the turn direction of the single-turn coil constituting the first loop pattern and the turn direction of the single-turn coil constituting the second loop pattern are opposite to each other. 
     In  FIG.  4   , coil magnetic flux lines (a coil magnetic flux line B 1  and a coil magnetic flux line B 2 ) that pass through the flexible substrate  61  in a case where the current flows in the driving coil  62  are illustrated. The coil magnetic flux line B 1  illustrates a magnetic flux line advancing in the direction Z 1 , a size of the coil magnetic flux line B 1  indicates strength. The coil magnetic flux line B 2  illustrates a magnetic flux line advancing in the direction Z 2 , a size of the coil magnetic flux line B 2  indicates strength. 
     The first loop pattern is arranged on an inner side of the driving coil  62 . Thus, only the coil magnetic flux line B 1  passes through the closed region L 1 . The second loop pattern is arranged to extend from the inner side of the driving coil  62  to the outer side of the driving coil  62 . Thus, the coil magnetic flux line B 1  and the coil magnetic flux line B 2  pass through the closed region L 2 . In the present embodiment, the first loop pattern and the second loop pattern are configured such that a magnetic flux φ L1  in the closed region L 1  indicating an integrated value of the coil magnetic flux line passing through the closed region L 1  approximately matches a magnetic flux φ L2  in the closed region L 2  indicating an integrated value of the coil magnetic flux line passing through the closed region L 2 . Approximate matching between two magnetic fluxes means that an absolute value of a difference between the two magnetic fluxes is less than or equal to a threshold value (ideally zero). This threshold value is appropriately decided as a value that does not affect position detection accuracy of the position sensor  63 . 
     The magnetic flux φ L2  in the closed region L 2  is an integrated value of a product of a magnetic flux density IN of a part on the inner side of the outer edge of the driving coil  62  out of the closed region L 2  and an area of this part, and a product of a magnetic flux density OUT of a part on the outer side of the outer edge of the driving coil  62  out of the closed region L 2  and an area of this part. It should be noted that reference numerals of the magnetic flux density IN and the magnetic flux density OUT are different. 
     A coil magnetic flux line passes through the closed region L 1  by causing the current to flow in the driving coil  62 . However, in a case where the coil magnetic flux line is changed, first electromotive force occurs in the first loop pattern. The first electromotive force corresponds to the magnetic flux φ L1  in the closed region L 1 . The wiring line region  64 A and the wiring line region  65 A constitute a first electrical wiring line that causes the first electromotive force to occur by causing the current to flow in the driving coil  62 . 
     Similarly, a coil magnetic flux line passes through the closed region L 2  by causing the current to flow in the driving coil  62 . However, in a case where the coil magnetic flux line is changed, second electromotive force occurs in the second loop pattern. The second electromotive force is in the opposite direction to the first electromotive force. In addition, the second electromotive force corresponds to the magnetic flux φ L2  in the closed region L 2 . The wiring line region  64 B and the wiring line region  65 B constitute a second electrical wiring line that causes the second electromotive force to occur by causing the current to flow in the driving coil  62 . 
     By approximately matching the magnetic flux φ L1  and the magnetic flux φ L2  as described above, the first electromotive force and the second electromotive force can be approximately matched. Consequently, the first electromotive force occurring in the electrical wiring line connecting the position sensor  63  to the control unit  18  can be canceled out by the second electromotive force occurring in the electrical wiring line. Accordingly, in a case where the current flows in the driving coil  62 , electromotive force occurring in the electrical wiring line can be minimized, and the electromotive force is unlikely to affect detection performance of the position sensor  63  compared to a case where the electromotive force is large. Consequently, the position detection accuracy of the movable unit  60  can be improved. 
       FIG.  5    is a schematic diagram that illustrates a first modification example of the electrical wiring line connecting the position sensor  63  to the control unit  18  and corresponds to  FIG.  4   .  FIG.  5    is different from  FIG.  4    in that the position sensor  63 , the control unit  18 , the electrical wiring line  64 , and the electrical wiring line  65  are shifted to a right side of the direction X, and a part of the wiring line region  65 B overlaps with the wiring line region  64 B in a range R 1 . 
     In the modification example illustrated in  FIG.  5   , the closed region L 2  is formed by a part from an end of the range R 1  on an opposite side from a control unit  18  side to the point P 1  out of the wiring line region  65 B and a part from an end of the range R 1  on an opposite side from the control unit  18  side to the point P 1  out of the wiring line region  64 B. In the modification example illustrated in  FIG.  5   , the closed region L 1  and the closed region L 2  have an axially symmetric shape about a straight line extending in the direction X through the point P 1 , and areas of the closed region L 1  and the closed region L 2  approximately match. In addition, one end part of each of the closed region L 1  and the closed region L 2  in the direction X overlaps with the driving coil  62 . Approximate matching between two areas means that an absolute value of a difference between the two areas is less than or equal to a threshold value (ideally zero). This threshold value is appropriately decided as a small value that does not affect the position detection accuracy of the position sensor  63 . 
     In the modification example in  FIG.  5   , a strength distribution (magnetic flux density) of the coil magnetic flux line in a region on the inner side of the outer edge of the driving coil  62  is constant in the direction Y at the same position in the direction X. The closed region L 1  and the closed region L 2  are at the same position in the direction X and are at different positions in only the direction Y. Furthermore, areas of the closed region L 1  and the closed region L 2  approximately match. Thus, the magnetic flux φ L1  of the closed region L 1  approximately matches the magnetic flux φ L2  of the closed region L 2 . Accordingly, as in the configuration in  FIG.  4   , in a case where the current flows in the driving coil  62 , electromotive force that may occur in the electrical wiring line  64  and the electrical wiring line  65  can be minimized, and the position detection accuracy of the movable unit  60  can be improved. 
       FIG.  6    is a schematic diagram that illustrates a second modification example of the electrical wiring line connecting the position sensor  63  to the control unit  18  and corresponds to  FIG.  4   .  FIG.  6    is different from  FIG.  5    only in that the position sensor  63 , the control unit  18 , the electrical wiring line  64 , and the electrical wiring line  65  are shifted to a left side, and the first loop pattern and the second loop pattern are arranged on the inner side of the driving coil  62 . According to the modification example in  FIG.  6   , the position detection accuracy of the movable unit  60  can be improved as in the configuration in  FIG.  5   . In addition, according to the modification examples in  FIG.  5    and  FIG.  6   , an area of a loop pattern can be minimized, and wiring line design can be easily performed. Thus, a manufacturing cost can be reduced. 
       FIG.  7    is a schematic diagram that illustrates a third modification example of the electrical wiring line connecting the position sensor  63  to the control unit  18  and corresponds to  FIG.  4   . In the modification example in  FIG.  7   , an electrical wiring line  66  that is formed to extend from the inner side of the driving coil  62  to the outer side of the driving coil  62  is formed in the flexible substrate  61  instead of the electrical wiring line  64  and the electrical wiring line  65 . 
     The electrical wiring line  66  is configured with a wiring line  66 A that connects one of the two differential output terminals of the position sensor  63  to the input terminal T 2  of the control unit  18 , and a wiring line  66 B that connects the other of the two differential output terminals of the position sensor  63  to the input terminal T 1  of the control unit  18 . 
     In the modification example illustrated in  FIG.  7   , in a state of a view in the direction Z, it can be said that a loop pattern PT (pattern forming a closed region L 3 ) that may function as a single-turn coil is formed by the wiring line  66 A, the wiring line  66 B, the position sensor  63 , and the control unit  18  in the flexible substrate  61 . 
     A magnetic flux φ L3  in the closed region L 3  is an integrated value of a magnetic flux φ L3a  of a part on the inner side of the outer edge of the driving coil  62  out of the closed region L 3  and a magnetic flux (pub of a part on the outer side of the outer edge of the driving coil  62  out of the closed region L 3 . A first area of a region of the loop pattern PT on the outer side of the driving coil  62  and a second area of a region of the loop pattern PT on the inner side of the outer edge of the driving coil  62  are decided such that the magnetic flux φ L3  is less than or equal to a threshold value (preferably zero). Specifically, the first area is larger than the second area. This threshold value is appropriately decided as a small value that does not affect the position detection accuracy of the position sensor  63 . 
     In the modification example illustrated in  FIG.  7   , a coil magnetic flux line passes through the closed region L 3  by causing the current to flow in the driving coil  62 . However, in a case where the coil magnetic flux line is changed, electromotive force occurs in the loop pattern PT. This electromotive force depends on the magnetic flux φ L3  in the closed region L 3 . However, the magnetic flux φ L3  is less than or equal to the threshold value. Thus, the electromotive force occurring by the electrical wiring line  66  by causing the current to flow in the driving coil  62  is less than or equal to the threshold value (preferably zero). This threshold value is appropriately decided as a small value that does not affect the position detection accuracy of the position sensor  63 . According to this modification example, an increase in the electromotive force occurring in the electrical wiring line  66  can be prevented, and the electromotive force is unlikely to affect the detection performance of the position sensor  63  compared to a case where the electromotive force is large. Consequently, the position detection accuracy of the movable unit  60  can be improved. 
     According to the modification example illustrated in  FIG.  7   , the electrical wiring line  66  can be formed in the same layer as the flexible substrate  61 . Thus, a degree of freedom in wiring line design is increased compared to the examples in  FIG.  4    to  FIG.  6   , and the manufacturing cost can be decreased. 
     The magnet  52 , the magnet  53 , the driving coil  62 , the position sensor  63 , the electrical wiring line  64 , the electrical wiring line  65 , and the control unit  18  or the magnet  52 , the magnet  53 , the driving coil  62 , the position sensor  63 , the electrical wiring line  66 , and the control unit  18  described so far constitute a drive device. 
     Next, a configuration of a smartphone that is another embodiment of the imaging apparatus according to the present invention will be described. 
       FIG.  8    illustrates an exterior of a smartphone  200 . The smartphone  200  illustrated in  FIG.  8    includes a casing  201  having a flat plate shape and comprises a display and input unit  204  in which a display panel  202  as a display unit and an operation panel  203  as an input unit are integrated on one surface of the casing  201 . 
     The casing  201  comprises a speaker  205 , a microphone  206 , an operation unit  207 , and a camera unit  208 . The configuration of the casing  201  is not limited thereto and can employ, for example, a configuration in which the display unit and the input unit are independently disposed, or a configuration that has a folded structure or a sliding mechanism. 
       FIG.  9    is a block diagram illustrating a configuration of the smartphone  200  illustrated in  FIG.  8   . 
     As illustrated in  FIG.  9   , a wireless communication unit  210 , the display and input unit  204 , a call unit  211 , the operation unit  207 , the camera unit  208 , a storage unit  212 , an external input-output unit  213 , a global navigation satellite system (GNSS) reception unit  214 , a motion sensor unit  215 , a power supply unit  216 , and a main control unit  220  are comprised as main constituents of the smartphone. 
     In addition, a wireless communication function of performing mobile wireless communication with a base station apparatus BS, not illustrated, through a mobile communication network NW, not illustrated, is provided as a main function of the smartphone  200 . 
     The wireless communication unit  210  performs wireless communication with the base station apparatus BS accommodated in the mobile communication network NW in accordance with an instruction from the main control unit  220 . By using the wireless communication, transmission and reception of various file data such as voice data and image data, electronic mail data, or the like and reception of web data, streaming data, or the like are performed. 
     The display and input unit  204  is a so-called touch panel that visually delivers information to the user by displaying images (still images and motion images), text information, or the like and detects a user operation with respect to the displayed information under control of the main control unit  220 . The display and input unit  204  comprises the display panel  202  and the operation panel  203 . 
     A liquid crystal display (LCD), an organic electro-luminescence display (OELD), or the like is used as a display device in the display panel  202 . 
     The operation panel  203  is a device that is placed such that an image displayed on the display surface of the display panel  202  can be visually recognized, is operated by a finger of the user or a stylus, and detects one or a plurality of coordinates. In a case where the device is operated by the finger of the user or the stylus, a detection signal generated by the operation is output to the main control unit  220 . Next, the main control unit  220  detects an operation position (coordinates) on the display panel  202  based on the received detection signal. 
     As illustrated in  FIG.  9   , while the display panel  202  and the operation panel  203  of the smartphone  200  illustrated as the imaging apparatus according to one embodiment of the present invention are integrated and constitute the display and input unit  204 , the operation panel  203  is arranged to completely cover the display panel  202 . 
     In a case where such arrangement is employed, the operation panel  203  may have a function of detecting the user operation even in a region outside the display panel  202 . In other words, the operation panel  203  may comprise a detection region (hereinafter, referred to as a display region) for an overlapping part overlapping with the display panel  202  and a detection region (hereinafter, referred to as a non-display region) for an outer edge portion other than the overlapping part that does not overlap with the display panel  202 . 
     A size of the display region and a size of the display panel  202  may completely match, but both sizes do not need to match. In addition, the operation panel  203  may comprise two sensitive regions of the outer edge portion and an inner part other than the outer edge portion. Furthermore, a width of the outer edge portion is appropriately designed depending on a size and the like of the casing  201 . 
     Furthermore, as a position detection method employed in the operation panel  203 , a matrix switch method, a resistive film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, an electrostatic capacitive method, and the like are exemplified, and any of the methods can be employed. 
     The call unit  211  comprises the speaker  205  or the microphone  206  and converts voice of the user input through the microphone  206  into voice data processable in the main control unit  220  and outputs the voice data to the main control unit  220 , or decodes voice data received by the wireless communication unit  210  or the external input-output unit  213  and outputs the decoded voice data from the speaker  205 . 
     In addition, as illustrated in  FIG.  8   , for example, the speaker  205  can be mounted on the same surface as a surface on which the display and input unit  204  is disposed, and the microphone  206  can be mounted on a side surface of the casing  201 . 
     The operation unit  207  is a hardware key that uses a key switch or the like, and receives an instruction from the user. For example, as illustrated in  FIG.  8   , the operation unit  207  is a push-button type switch that is mounted on a side surface of the casing  201  of the smartphone  200  and is set to an ON state in a case where the switch is pressed by the finger or the like, and set to an OFF state by restoring force of a spring or the like in a case where the finger is released. 
     In the storage unit  212 , a control program and control data of the main control unit  220 , application software, address data in which a name, a telephone number, or the like of a communication counterpart is associated, transmitted and received electronic mail data, web data downloaded by web browsing, and downloaded contents data are stored, and streaming data or the like is temporarily stored. In addition, the storage unit  212  is configured with an internal storage unit  217  incorporated in the smartphone and an external storage unit  218  that includes a slot for an attachable and detachable external memory. 
     Each of the internal storage unit  217  and the external storage unit  218  constituting the storage unit  212  is implemented using a storage medium such as a memory (for example, a MicroSD (registered trademark) memory) of a flash memory type, a hard disk type, a multimedia card micro type, or a card type, a random access memory (RAM), or a read only memory (ROM). 
     The external input-output unit  213  is an interface with all external apparatuses connected to the smartphone  200  and is directly or indirectly connected to other external apparatuses by communication or the like (for example, Universal Serial Bus (USB), IEEE1394, Bluetooth (registered trademark), radio frequency identification (RFID), infrared communication (Infrared Data Association (IrDA) (registered trademark)), Ultra Wideband (UWB) (registered trademark), or ZigBee (registered trademark)) or through a network (for example, the Ethernet (registered trademark) or a wireless local area network (LAN)). 
     For example, the external apparatuses connected to the smartphone  200  include a wired/wireless headset, a wired/wireless external charger, a wired/wireless data port, a memory card and a subscriber identity module (SIM)/user identity module (UIM) card connected through a card socket, an external audio and video apparatus connected through an audio and video input/output (I/O) terminal, a wirelessly connected external audio and video apparatus, a smartphone connected in a wired/wireless manner, a personal computer connected in a wired/wireless manner, and an earphone. 
     The external input-output unit  213  can deliver data transferred from the external apparatuses to each constituent in the smartphone  200  or transfer data in the smartphone  200  to the external apparatuses. 
     The GNSS reception unit  214  receives GNSS signals transmitted from GNSS satellites ST 1  to STn, executes positioning computation based on the received plurality of GNSS signals, and detects a position that includes a latitude, a longitude, and an altitude of the smartphone  200  in accordance with an instruction from the main control unit  220 . In a case where positional information can be acquired from the wireless communication unit  210  or the external input-output unit  213  (for example, a wireless LAN), the GNSS reception unit  214  can detect the position using the positional information. 
     The motion sensor unit  215  comprises, for example, a three-axis acceleration sensor and detects a physical motion of the smartphone  200  in accordance with an instruction from the main control unit  220 . By detecting the physical motion of the smartphone  200 , a movement direction or an acceleration of the smartphone  200  is detected. A detection result is output to the main control unit  220 . 
     The power supply unit  216  supplies power stored in a battery (not illustrated) to each unit of the smartphone  200  in accordance with an instruction from the main control unit  220 . 
     The main control unit  220  comprises a microprocessor, operates in accordance with the control program and the control data stored in the storage unit  212 , and manages and controls each unit of the smartphone  200 . The microprocessor of the main control unit  220  has the same function as the control unit  18 . In addition, the main control unit  220  has a mobile communication control function of controlling each unit of a communication system and an application processing function for performing voice communication or data communication through the wireless communication unit  210 . 
     The application processing function is implemented by operating the main control unit  220  in accordance with the application software stored in the storage unit  212 . For example, the application processing function is an infrared communication function of performing data communication with an opposing apparatus by controlling the external input-output unit  213 , an electronic mail function of transmitting and receiving electronic mails, or a web browsing function of browsing a web page. 
     In addition, the main control unit  220  has an image processing function such as displaying an image on the display and input unit  204  based on image data (data of a still image or a motion image) such as reception data or downloaded streaming data. 
     The image processing function refers to a function of causing the main control unit  220  to decode the image data, perform image processing on the decoding result, and display an image on the display and input unit  204 . 
     Furthermore, the main control unit  220  executes a display control for the display panel  202  and an operation detection control for detecting the user operation through the operation unit  207  and the operation panel  203 . 
     By executing the display control, the main control unit  220  displays an icon for starting the application software or a software key such as a scroll bar or displays a window for creating an electronic mail. 
     The scroll bar refers to a software key for receiving an instruction to move a display part of a large image or the like that does not fit in the display region of the display panel  202 . 
     In addition, by executing the operation detection control, the main control unit  220  detects the user operation through the operation unit  207 , receives an operation with respect to the icon and an input of a text string in an input field of the window through the operation panel  203 , or receives a request for scrolling the display image through the scroll bar. 
     Furthermore, by executing the operation detection control, the main control unit  220  is provided with a touch panel control function of determining whether the operation position on the operation panel  203  is in the overlapping part (display region) overlapping with the display panel  202  or the other edge part (non-display region) not overlapping with the display panel  202  and controlling the sensitive region of the operation panel  203  or a display position of the software key. 
     In addition, the main control unit  220  can detect a gesture operation with respect to the operation panel  203  and execute a preset function depending on the detected gesture operation. 
     The gesture operation is not a simple touch operation in the related art and means an operation of drawing a trajectory by the finger or the like, designating a plurality of positions at the same time, or drawing a trajectory for at least one of the plurality of positions as a combination thereof. 
     The camera unit  208  includes the lens device  20 , the imaging element  12 , the imaging element shift mechanism  13 , the imaging element drive unit  14 , and the vibration detector  17  illustrated in  FIG.  1   . 
     Captured image data generated by the camera unit  208  can be stored in the storage unit  212  or be output through the external input-output unit  213  or the wireless communication unit  210 . 
     In the smartphone  200  illustrated in  FIG.  9   , the camera unit  208  is mounted on the same surface as the display and input unit  204 . However, a mount position of the camera unit  208  is not limited thereto. The camera unit  208  may be mounted on a rear surface of the display and input unit  204 . 
     In addition, the camera unit  208  can be used in various functions of the smartphone  200 . For example, an image acquired by the camera unit  208  can be displayed on the display panel  202 , or the image of the camera unit  208  can be used as one of operation inputs of the operation panel  203 . 
     In addition, in a case where the GNSS reception unit  214  detects the position, the position can be detected by referring to the image from the camera unit  208 . Furthermore, by referring to the image from the camera unit  208 , an optical axis direction of the camera unit  208  of the smartphone  200  can be determined, or the current usage environment can be determined without using the three-axis acceleration sensor or by using the three-axis acceleration sensor together. The image from the camera unit  208  can also be used in the application software. 
     Besides, image data of a still picture or a motion picture to which the positional information acquired by the GNSS reception unit  214 , voice information (may be text information acquired by performing voice to text conversion by the main control unit or the like) acquired by the microphone  206 , attitude information acquired by the motion sensor unit  215 , or the like is added can be stored in the storage unit  212  or be output through the external input-output unit  213  or the wireless communication unit  210 . 
     Even in the smartphone  200  having the above configuration, image shake correction can be performed with high accuracy by detecting a position of the imaging element with high accuracy. 
     As described so far, the magnet  52  and the magnet  53  are disposed in the fixed unit  50 , and the driving coil  62 , the position sensor  63 , and the electrical wiring line are disposed in the movable unit  60 . However, it is also possible to provide a configuration in which the magnet  52  and the magnet  53  are disposed in the movable unit  60  and the driving coil  62 , the position sensor  63 , and the electrical wiring line are disposed in the fixed unit  50 . 
     In addition, as described so far, the camera body  10  of the digital camera  1  performs image shake correction by moving the imaging element  12 . The digital camera  1  may perform image shake correction by moving a vibration-proof lens included in the imaging optical system  30  of the lens device  20  instead of moving the imaging element  12 . In this case, the configuration illustrated in  FIG.  2    may be employed as a structure for driving of the vibration-proof lens and position detection. 
     In addition, in the configuration examples illustrated in  FIG.  4    to  FIG.  6   , the first loop pattern is in contact with the second loop pattern at one point P 1  in a plan view. However, the first loop pattern may also be configured to be in contact with the second loop pattern at a line instead of a point. 
     In addition, while the position sensor  63  is arranged on the inner side of the driving coil  62 , the position sensor  63  may be arranged on the outer side of the driving coil  62 . In this case, for example, the electrical wiring line  64  and the electrical wiring line  65  illustrated in  FIG.  4    to  FIG.  6    are arranged on the outer side of the driving coil  62 . A shape and arrangement of each loop pattern is decided such that a magnetic flux in the first loop pattern approximately matches a magnetic flux in the second loop pattern. In the modification example illustrated in  FIG.  7   , for example, as illustrated in  FIG.  10   , the wiring line  66 A and the wiring line  66 B may be formed in different layers and be connected to the control unit  18  after overlapping with each other in the middle thereof. 
     As described above, at least the following matters are disclosed in the present specification. While corresponding constituents and the like in the embodiment are shown in parentheses, the present invention is not limited thereto. 
     (1) A drive device comprising a magnet (the magnet  52  and the magnet  53 ), a coil and a position sensor (the driving coil  62  and the position sensor  63 ) that receive an action from the magnet, a first electrical wiring line (the wiring line region  64 A and the wiring line region  65 A) that passes through the position sensor and causes first electromotive force to occur by causing a current to flow in the coil, a second electrical wiring line (the wiring line region  64 B and the wiring line region  65 B) that causes second electromotive force which is electromotive force in an opposite direction to the first electromotive force to occur by causing the current to flow in the coil, and a processor (control unit  18 ) configured to control the current flowing in the coil based on an output of the position sensor. 
     (2) The drive device according to (1), in which the first electrical wiring line forms a first loop pattern, and the second electrical wiring line forms a second loop pattern. 
     (3) The drive device according to (2), in which out of magnetic flux lines generated by causing the current to flow in the coil, an integrated value (magnetic flux φ L1 ) of a magnetic flux line passing through the first loop pattern approximately matches an integrated value (magnetic flux φ L2 ) of a magnetic flux line passing through the second loop pattern. 
     (4) The drive device according to (2) or (3), in which the first electrical wiring line is electrically connected to the second electrical wiring line. 
     (5) The drive device according to (4), in which in a state of a view in a direction (direction Z) of a magnetic flux line passing through the coil, the first electrical wiring line is in contact with the second electrical wiring line at a point (point P 1 ) or a line. 
     (6) The drive device according to any one of (2) to (5), in which in a state of a view in a direction (direction Z) of a magnetic flux line passing through the coil, an area of the first loop pattern approximately matches an area of the second loop pattern. 
     (7) The drive device according to any one of (2) to (6), in which the position sensor is arranged on an inner side of the coil, in a state of a view in a direction (direction Z) of a magnetic flux line passing through the coil. 
     (8) The drive device according to (7), in which in a state of a view in the direction (direction Z) of the magnetic flux line passing through the coil, the first loop pattern and the second loop pattern are arranged on the inner side of the coil. 
     (9) The drive device according to (7), in which in a state of a view in the direction (direction Z) of the magnetic flux line passing through the coil, the first loop pattern and the second loop pattern are arranged on an inner side of an outer edge of the coil and partially overlap with the coil. 
     (10) The drive device according to any one of (1) to (9), in which the first electrical wiring line and the second electrical wiring line are differential output wiring lines of the position sensor. 
     (11) A drive device comprising a magnet (the magnet  52  and the magnet  53 ), a coil and a position sensor (the driving coil  62  and the position sensor  63 ) that receive an action from the magnet, an electrical wiring line (electrical wiring line  66 ) that passes through the position sensor and extends from an inner side of the coil to an outer side of the coil, and a processor (control unit  18 ) configured to control a current flowing in the coil based on an output of the position sensor, in which electromotive force occurring by the electrical wiring line by causing the current to flow in the coil is less than or equal to a threshold value. 
     (12) The drive device according to (11), in which the electrical wiring line forms a loop pattern. 
     (13) The drive device according to (12), in which an integrated value (magnetic flux φ L3 ) of a magnetic flux line passing through the loop pattern by causing the current to flow in the coil is less than or equal to a threshold value. 
     (14) The drive device according to (12) or (13), in which in a state of a view in a direction (direction Z) of a magnetic flux line passing through the coil, an area (first area) of a region on an outer side of the coil in the loop pattern is larger than an area (second area) of a region on an inner side of an outer edge of the coil in the loop pattern. 
     (15) The drive device according to any one of (11) to (14), in which the position sensor is arranged on an inner side of the coil, in a state of a view in a direction (direction Z) of a magnetic flux line passing through the coil. 
     (16) The drive device according to any one of (11) to (15), in which the electrical wiring line is a differential output wiring line of the position sensor. 
     (17) An imaging apparatus (digital camera  1 ) comprising the drive device according to any one of (1) to (16). 
     EXPLANATION OF REFERENCES 
     
         
         
           
               1 : digital camera 
               10 : camera body 
               11 : driver 
               12 : imaging element 
               13 : imaging element shift mechanism 
               14 : imaging element drive unit 
               15 : display unit 
               16 : memory 
               17 : vibration detector 
               18 : control unit 
               19 : recording medium 
               20 : lens device 
               30 : imaging optical system 
               31 : imaging lens 
               40 : lens control unit 
               50 : fixed unit 
               51 : flat member 
               52 ,  53 : magnet 
               60 : movable unit 
               61 : flexible substrate 
               62 : driving coil 
               63 : position sensor 
               64 ,  65 : electrical wiring line 
               64 A,  64 B,  65 A,  65 B: wiring line region 
               66 : electrical wiring line 
               66 A,  66 B: wiring line 
             L 1 , L 2 , L 3 : closed region 
             P 1 : point 
             T 1 , T 2 : input terminal 
             B 1 , B 2 : coil magnetic flux line 
             R 1 : range 
               200 : smartphone 
               201 : casing 
               202 : display panel 
               203 : operation panel 
               204 : display and input unit 
               205 : speaker 
               206 : microphone 
               208 : camera unit 
               210 : wireless communication unit 
               211 : call unit 
               212 : storage unit 
               213 : external input-output unit 
               214 : GNSS reception unit 
               215 : motion sensor unit 
               216 : power supply unit 
               217 : internal storage unit 
               218 : external storage unit 
               220 : main control unit