Patent Publication Number: US-2023156329-A1

Title: Camera module with sensor shifting module

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2021-0156565 filed on Nov. 15, 2021 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. 
     BACKGROUND 
     1. Field 
     The following description relates to a camera module with sensor shifting module. 
     2. Description of Related Art 
     With the development of communications technology, mobile devices, such as smartphones, have been widely distributed. Accordingly, the demand for the functions of a camera included in mobile devices has also increased. For example, a camera included in a mobile device may be designed to provide advanced imaging functions (e.g., an autofocus function, an anti-shake function, and the like) implemented in a general DSLR camera despite the small size thereof. 
     The optical image stabilization function, that is, an optical image stabilization (OIS) function, may be provided to prevent image blur from occurring when a camera is shaken during the exposure time, and the OIS function may be desired when imaging in a low-light environment in which a camera is shaken and the exposure time is long. The OIS may include digital IS (DIS), electronic IS (EIS), and optical IS (OIS). Among these functions, optical IS (OIS) may fundamentally prevent image deterioration caused by shaking by correcting an optical path by moving a lens or image sensor in a direction orthogonal to the optical axis. Since a mechanical actuator may be desired, it may be complicated to implement as a device, and although relatively expensive, excellent compensation performance may be obtained. 
     A lens barrel may include an optical system therein, such that a relatively large amount of force may be required to drive the lens barrel. On the other hand, an image sensor may be relatively light and advantageous to implement an excellent OIS function even with a small force. However, when an actuator for driving the image sensor includes a permanent magnet, the magnetic field of the permanent magnet may affect neighboring electronic components. Also, when a mobile device includes a plurality of cameras disposed adjacently to each other, a permanent magnet in each camera may negatively affect the operation of the neighboring cameras, making it functionally difficult to dispose the cameras adjacent to each other or other electronic components in the camera. 
     SUMMARY 
     This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     In one general aspect, a sensor shifting module includes a fixed body; a first movable body, movably disposed in the fixed body, comprising an image sensor having an imaging plane opposite to a first direction; and a driver, configured to move the first movable body in a direction orthogonal to the first direction with respect to the fixed body, comprising a driving coil coupled to one of the fixed body and the first movable body, and a driving yoke coupled to another of the fixed body and the first movable body. The driving yoke is disposed to oppose the driving coil in the direction orthogonal to the first direction. When current is applied to the driving coil, the first movable body is configured to move in the direction orthogonal to the first direction by electromagnetic interaction between the driving coil and the driving yoke. 
     The driving yoke may be a soft magnetic material. 
     When no current flows in the driving coil, a magnetic field due to the driving yoke may be zero. 
     The driving coil and the driving yoke may oppose each other in a second direction orthogonal to the first direction, and electromagnetic interaction between the driving coil and the driving yoke may be configured to move the movable body in the second direction. 
     The driving coil and the driving yoke may oppose each other in a second direction orthogonal to the first direction. The driving coil may include a first driving coil and a second driving coil disposed on both sides of the first movable body in the second direction, respectively. The driving yoke may include a first driving yoke and a second driving yoke opposing the first driving coil and the second driving coil in the second direction, respectively. 
     The driver may further include a yoke disposed on one side of the driving coil, and the driving coil may be disposed between the driving yoke and the yoke. 
     The driving coil and the driving yoke may oppose each other in a diagonal direction of the image sensor. 
     The sensor shifting module may further include an elastic member, disposed between the first movable body and the fixed body, configured to deform based on a movement of the first movable body with respect to the fixed body. 
     The elastic member may be a leaf spring. 
     The sensor shifting module may further include a second movable body disposed between the first movable body and the fixed body; a first ball member disposed between the fixed body and the second movable body; and a second ball member disposed between the second movable body and the first movable body. 
     The fixed body and the second movable body may include a first groove configured to accommodate, at least, a portion of the first ball member, and the second movable body and the first movable body may include a second groove configured to accommodate, at least, a portion of the second ball member. 
     The first groove may extend in a second direction orthogonal to the first direction, and the second groove may extend in a third direction orthogonal to each of the first direction and the second direction. 
     The driver may further include a first magnetic body, coupled to the second movable body, and a second magnetic body, coupled to each of the first movable body and the fixed body, opposing the first magnetic body. 
     The second magnetic body may include a through-portion, and the driver further may include a position sensor disposed in the through-portion. 
     In another general aspect, a camera module includes a lens module including a lens, and a sensor shifting module. The sensor shifting module includes a fixed body; a first movable body, movably disposed in the fixed body, comprising an image sensor opposing a first direction; and a driver, configured to move the first movable body in a direction orthogonal to the first direction with respect to the fixed body, comprising a driving coil, coupled to one of the fixed body and the first movable body, and a driving yoke coupled to another of the fixed body and the first movable body. The driving yoke is disposed to oppose the driving coil in the direction orthogonal to the first direction, and a space between the driving yoke and the driving coil is an air gap. 
     The driving yoke may be a soft magnetic material. 
     The camera module may further include an elastic member, disposed between the first movable body and the fixed body, configured to deform based on a movement of the first movable body with respect to the fixed body. 
     Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a diagram illustrating components included in a camera module according to an example embodiment of the present disclosure. 
         FIG.  2    is a diagram illustrating a sensor shifting module according to an example embodiment of the present disclosure. 
         FIG.  3    is a diagram illustrating a pulling means and a position sensor according to an example embodiment of the present disclosure. 
         FIGS.  4 A to  4 C  are diagrams illustrating an OIS driver according to an example embodiment of the present disclosure. 
         FIGS.  5 A to  5 D  are diagrams illustrating the movement of a first movable body due to an OIS driver in  FIG.  4 A . 
         FIG.  6    is a diagram illustrating an example in which unit drivers are disposed in a diagonal direction of a driving direction of an image sensor according to an example embodiment of the present disclosure. 
         FIGS.  7 A to  7 D  are diagrams illustrating movement of a first movable body due to an OIS driver in  FIG.  6   . 
         FIG.  8    is a diagram illustrating an elastic member providing restoring force to a first moveable body according to an example embodiment of the present disclosure. 
     
    
    
     Throughout the drawings and the detailed description, the same reference numerals refer to the same or like elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience. 
     DETAILED DESCRIPTION 
     The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the disclosure of this application. For example, the sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent after an understanding of the disclosure of this application, with the exception of operations necessarily occurring in a certain order. Also, descriptions of features that are known after understanding of the disclosure of this application may be omitted for increased clarity and conciseness. 
     The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways of implementing the methods, apparatuses, and/or systems described herein that will be apparent after an understanding of the disclosure of this application. 
     Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other elements intervening therebetween. 
     As used herein, the term “and/or” includes any one and any combination of any two or more of the associated listed items. 
     Although terms such as “first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples. 
     Spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element&#39;s relationship to another element as shown in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (for example, rotated 90 degrees or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly. 
     The terminology used herein is for describing various examples only, and is not to be used to limit the disclosure. The articles “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “includes,” and “has” specify the presence of stated features, numbers, operations, members, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and/or combinations thereof. 
     Due to manufacturing techniques and/or tolerances, variations of the shapes shown in the drawings may occur. Thus, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing. 
     The features of the examples described herein may be combined in various ways as will be apparent after an understanding of the disclosure of this application. Further, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the disclosure of this application. 
     In the example embodiments, the X-direction, the Y-direction, and the Z-direction may refer to a direction parallel to the X axis, a direction parallel to the Y axis, and a direction parallel to the Z axis, respectively, in the drawings. Also, unless otherwise indicated, the X-direction may include both the +X-axis direction and the −X-axis direction, which may also apply to the Y-direction and the Z-direction. 
     In the example embodiments, two directions (or axes) parallel or orthogonal to each other may also include the examples in which the two directions (or axes) are substantially parallel to or substantially side by side to each other. For example, the configuration in which the first axis and the second axis are orthogonal to each other may indicate that the first axis and the second axis may form an angle of 90 degrees or an angle approximated to 90 degrees. 
     “An example embodiment” does not necessarily indicate the same example embodiments. The particular features, structures, or characteristics may be combined in any suitable manner consistent with the example embodiments. 
     In the example embodiments, “configured to” may indicate that a component may include a structure desired to implement a function. 
       FIG.  1    is a diagram illustrating components included in a camera module  1  according to an example embodiment. 
     In an example embodiment, the camera module  1  may include a lens module  20 , including at least one lens  21 , a lens barrel  22 , accommodating at least one lens  21 , and an image sensor  11 . Light L may pass through the lens module  20  and may reach an imaging plane of the image sensor  11 . The camera module  1  may include an AF driver  23 , which may move the lens module  20  in an optical axis direction to adjust a focal length. The AF driver  23  may include, for example, a coil and a magnet opposing each other. The coil may be fixedly coupled to the lens module  20 , the magnet may be coupled to a fixed body such as a housing, and electromagnetic interaction between the coil and the magnet may allow the lens module  20  to move in the optical axis direction. 
     In an example embodiment, the camera module  1  may provide an optical image stabilization (hereinafter, “OIS”) function. The camera module  1  may provide an OIS function by driving the image sensor  11 . For example, the camera module  1  may include an OIS driver  12  configured to move the image sensor  11  in a direction orthogonal to the optical axis or to allow the image sensor  11  to rotate about an axis parallel to the optical axis or to rotate about an axis orthogonal to the optical axis. 
     In an example embodiment, the camera module  1  may include a sensor shifting module  10 . The sensor shifting module  10  may include components desired to implement the OIS function by driving the image sensor  11 . For example, the sensor shifting module  10  may include an image sensor  11  and an OIS driver  12  for driving the image sensor  11 . As another example, the sensor shifting module  10  may refer to only the OIS driver  12 , excluding the image sensor  11 . 
     In an example embodiment, the camera module  1  may further include an optical element in addition to the lens module  20  and the image sensor  11 . In an example embodiment, the camera module  1  may include two or more lens modules. For example, the first optical element  30  and/or the second optical element  40  may be a lens module distinct from the lens module  20 . 
     In an example embodiment, the camera module  1  may include an optical path changing element disposed in front of the lens module  20 . For example, the first optical element  30  may be implemented as a prism or a mirror. In another example embodiment, the optical path changing element may be disposed between the image sensor  11  and the lens module  20 . For example, the second optical element  40  may be implemented as a prism or a mirror. 
     Hereinafter, the sensor shifting module  100  or the OIS driver  120  described in  FIGS.  2  to  8    may be applied to the camera module  1  in  FIG.  1   . 
       FIG.  2    illustrates a sensor shifting module  100  according to an example embodiment. The sensor shifting module  100  may include an OIS driver  120  for driving the image sensor  111 . In an example embodiment, the OIS driver  120  may include a first movable body  110 , including an image sensor  111  and a fixed body  130 . The first movable body  110  may be movably disposed in the fixed body  130 . The first movable body  110  may be configured to move together with the image sensor  111 . For example, the first movable body  110  may include a sensor substrate  112  on which the image sensor  111  is mounted and a sensor holder  113  coupled to the sensor substrate  112 . A signal from the image sensor  111  may be transmitted to another electronic component (e.g., an image signal processor (ISP)) through the sensor substrate  112  and the connector  150 . 
     The fixed body  130  may include a base  131  and components fixedly coupled to the base  131 . For example, the fixed body  130  may include a driving coil  122  and a yoke  123  to be described later. 
     The first movable body  110  may, through the OIS driver  120 , move in a direction orthogonal to a direction in which the imaging plane  111   a  of the image sensor  111  is directed. In an example embodiment, the OIS driver  120  may compensate for the shaking of the camera module  1  or the electronic device on which the image sensor  111  is mounted in a direction orthogonal to the optical axis O. The OIS driver  120  may move the image sensor  111  in a first direction and a second direction orthogonal to the optical axis O. As illustrated in FIG. The first direction and the second direction may intersect each other. For example, the OIS driver  120  may move the first movable body  110  in the X-direction and/or the Y-direction orthogonal to the Z axis, such that the shaking in the X-direction and/or the Y-direction may be corrected. 
     In the example embodiments, the direction in which the imaging plane  111   a  of the image sensor  111  is directed may be referred to as an optical axis O direction. That is, the first movable body  110  may move in a direction orthogonal to the optical axis O with respect to the fixed body  130 . In the drawings, the optical axis O may be parallel to the Z axis; accordingly, the Z-direction may refer to the direction parallel to the optical axis O. Also, the X-direction or Y-direction may refer to a direction orthogonal to the optical axis O. For example, in the example embodiments, the configuration in which the first movable body  110  may in the X-direction may indicate that the first movable body  110  may move in a direction orthogonal to the optical axis O. For another example, the configuration in which the driving yoke  121  and the driving coil  122  oppose each other in the X-direction may indicate that the driving yoke  121  and the driving coil  122  may oppose each other in a direction orthogonal to the optical axis O. Also, the X-direction or the Y-direction may be an example of two directions orthogonal to the optical axis and intersecting each other, and in the example embodiments, the X-direction and the Y-direction may be two directions orthogonal to the optical axis O and intersecting each other. 
     In an example embodiment, the OIS driver  120  may include a second movable body  140  disposed between the first movable body  110  and the fixed body  130 . The second movable body  140  may include a ball guide  141  and a component (e.g., a first magnetic body  124 ) fixedly coupled to the ball guide  141 . 
     In an example embodiment, the first ball member B 1  may be disposed between the fixed body  130  and the second movable body  140 , and the second ball member B 2  may be disposed between the second movable body  140  and the first movable body  110 . 
     Each of the fixed body  130  and the second movable body  140  may include a first groove G 1  for accommodating at least a portion of the first ball member B 1 . Each of the second movable body  140  and the first movable body  110  may include a second groove G 2  for accommodating at least a portion of the second ball member B 2 . 
     In the example embodiment, the number of each of the first ball member B 1 , the second ball member B 2 , the first groove G 1 , and the second groove G 2  may be described as one, but a plurality of each component may be provided. 
     The first groove G 1  and the second groove G 2  may extend in two directions orthogonal to the optical axis O, respectively, and intersecting each other. For example, when the optical axis O is parallel to the Z axis, the first groove G 1  may extend in the Y-direction, and the second groove G 2  may extend in the X-direction. The first ball member B 1  and the second ball member B 2  move along the first groove G 1  and the second groove G 2 , respectively. Accordingly, the movement direction of the second movable body  140  with respect to the fixed body  130  may be limited to the Y-direction, and the movement direction of the first movable body  110  with respect to the second movable body  140  may be limited to the Y-direction. 
     In  FIG.  2   , the first groove G 1  and the second groove G 2  may be formed only in the second movable body  140  and the first movable body  110 , respectively, but an example embodiment thereof is not limited thereto. For example, the first groove G 1  may be formed in both the base  131  and the ball guide  141 . Also, the second groove G 2  may be formed in both the ball guide  141  and the sensor holder  113 . 
     The second movable body  140  or the ball guide  141  may not be essential components, and the first movable body  110  may move directly on the base  131 . For example, in  FIG.  2   , the second movable body  140  may not be provided, a ball member may be disposed between the sensor holder  113  and the base  131 , and the sensor holder  113  and/or the base  131  may include a groove to accommodate the ball member. 
       FIG.  3    illustrates a pulling means and a position sensor according to an example embodiment. 
     The first movable body  110  may need to move only in a direction orthogonal to the optical axis O, and may not move in a direction parallel to the optical axis O. To this end, the OIS driver  120  may include a pulling means. The pulling means may include the second magnetic bodies  125  and  126  and the first magnetic body  124  disposed to oppose each other in the optical axis O direction. A magnetic attraction may act between the first magnetic body  124  and the second magnetic body  125  and  126 . For example, the first magnetic body  124  may be a permanent magnet, and the second magnetic body  125  and  126  may be a yoke. As another example, the first magnetic body  124  and the second magnetic body  125  and  126  may be permanent magnets. 
     In an example embodiment, the first magnetic body  124  may be coupled to the ball guide  141 , and a 2-1 magnetic material  125  and a 2-2 magnetic material  126  opposing the first magnetic body  124  in the Z-direction may be disposed in the sensor holder  113  and the base  131 , respectively. 
     Referring to  FIGS.  2  and  3   , the first movable body  110  may be pulled toward the base  131  by magnetic force arising between the second magnetic bodies  125  and  126  and the first magnetic body  124 , and the first ball member B 1  and the second ball member B 2  may roll while being in close contact with the first groove G 1  and the second groove G 2 , respectively. When the second movable body  140  may not be provided, the magnet and the yoke may be mounted on the sensor holder  113  or the base  131 , respectively, such that the magnetic force between the components may pull the sensor holder  113  toward the base  131  (that is, −Z-direction) 
     Referring to  FIG.  3   , in an example embodiment, the OIS driver  120  may include a position sensor  127  and  128  which may measure how much the first movable body  110  moves in a direction orthogonal to the optical axis O. The position sensors  127  and  128  may be configured as Hall sensors or magnetoresistance sensors. 
     The position sensors  127  and  128  may be disposed to oppose the first magnetic body  124 . For example, the position sensors  127  and  128  may be disposed on the sensor holder  113  and/or the base  131  to oppose the first magnetic body  124 . In an example embodiment, the position sensors  127  and  128  may be disposed in the second magnetic bodies  125  and  126 . In an example embodiment, the second magnetic bodies  125  and  126  may include through-portions  125   a  and  126   a , and the position sensors  127  and  128  may be disposed in the through-portions  125   a  and  126   a.    
     The first movable body  110  may move in the X-direction with respect to the second movable body  140 , and the first position sensor  127  disposed in the 2-1 magnetic body  125  may measure a displacement in the X-direction between  110  and the second movable body  140 . The second movable body  140  may move in the Y-direction with respect to the fixed body  130 , and the second position sensor  128  disposed in the 2-2 magnetic body  126  may measure a displacement in the Y-direction between the fixed body  130  and the second movable body  130 . 
     The first position sensor  127  coupled to the first movable body  110  may be electrically connected to the other electronic components through a flexible substrate. For example, a signal generated by the first position sensor  127  may be electrically connected to a connector  150  through an electrical wiring provided on the sensor substrate  112 . 
     Referring to  FIG.  2   , in an example embodiment, the OIS driver  120  may include a driving coil  122  coupled to one of a first movable body  110  and a fixed body  130 , and a driving yoke  121  coupled to the other of the first movable body  110  and the fixed body  130 . For example, referring to  FIG.  2   , in an example embodiment, the driving coil  122  and the driving yoke  121  may be coupled to the base  131  and the sensor holder  113 , respectively. The driving yoke  121  and the driving coil  122  may oppose each other in a direction orthogonal to the optical axis O. Electromagnetic interaction between the driving yoke  121  and the driving coil  122  may allow the first movable body  110  to move in a direction orthogonal to the optical axis O with respect to the fixed body  130 . 
     In an example embodiment, the OIS driver  120  may further include a yoke  123  disposed on one side of the coil. The yoke  123  may allow the magnetic field generated in the coil to be concentrated only in a direction toward the driving yoke  121 . Since the yoke  123  is disposed on one side of the driving coil  121 , the magnetic field generated by the driving coil  121  may be prevented from affecting the other electronic components or the effect of the magnetic field on the other electronic components may be reduced. 
     In the example embodiments, the driving coil  122  and the driving yoke  121  may be coupled to the fixed body  130  and the first movable body  110 , respectively, but an example embodiment thereof is not limited thereto. In another example embodiment, the driving coil  122  and the driving yoke  121  may be coupled to the first movable body  110  and the fixed body  130 , respectively. For example, the driving coil  122  and the driving yoke  121  may be coupled to the sensor holder  113  and the base  131 , respectively. 
     An air gap may be formed between the driving coil  122  and the driving yoke  121 . Alternatively, a space between the driving coil  122  and the driving coil  121  may be an air gap. That is, no other member (e.g., a magnet) may be present between the driving coil  122  and the driving yoke  121 . The driving coil  122  and the driving yoke  121  may directly oppose each other with an air gap therebetween. 
       FIG.  2    illustrates components of the OIS driver  120 , and the example embodiment thereof is not limited to the structure in  FIG.  2   . 
     In an example embodiment, the OIS driver  120  may not include a permanent magnet. In an example embodiment, when no current flows in the driving coil  122 , the magnetic field caused by the driving yoke  121  may be zero or at a very small level. Accordingly, the magnetic field caused by the OIS driver  120  may be prevented from affecting the other electronic components (e.g., the other electronic components in the camera module  1 , or the other electronic components in the camera module  1 ) or the effect of the magnetic field on the other electronic components may be reduced. 
     In an example embodiment, the driving yoke  121  may be a soft magnetic material. A soft magnetic material may have a small coercive force and may be magnetized when exposed to a magnetic field, but when the magnetic field disappears, the driving yoke  121  may have a relatively low level of magnetism or may lose magnetism. 
     When a current is applied to the driving coil  122 , the driving yoke  121  may be magnetized, such that reluctance force may arise between the driving coil  122  and the driving yoke  121 . Attractive force may arise in a direction in which the driving yoke  121  and the driving coil  122  oppose each other, and the attractive force may move the first movable body  110  in the corresponding direction with respect to the fixed body  130 . For example, referring to  FIG.  4 A , when a current is applied to the first driving coil  122 , an attractive force may arise between the first driving coil  122  and the first driving yoke  121 , and may move the first movable body  110  in the −X-direction. When a current is applied to the second driving coil  122 , an attractive force may arise between the second driving coil  122  and the second driving yoke  121 , moving the first movable body  110  in the +X-direction. 
       FIGS.  4 A to  4 C  are diagrams illustrating an OIS driver  120  according to an example embodiment, illustrating a ball member and a groove arranged differently from the examples in  FIG.  4 B , and the descriptions of the other components may be the same as the descriptions described with reference to  FIG.  4 A . 
     The OIS driver  120  may include a plurality of unit drivers  120   a ,  120   b ,  120   c , and  120   d . The unit drivers  120   a ,  120   b ,  120   c , and  120   d  may include a driving yoke  121  and a driving coil  122  opposing each other. The unit drivers  120   a ,  120   b ,  120   c , and  120   d  may further include a yoke  123  disposed on one side of the driving coil  122 . For example, the first unit driver  120   a  may include a first driving yoke  121   a , a first driving coil  122   a , and a first yoke  123   a.    
     Since only attractive force arises between the driving coil  122  and the driving yoke  121 , at least two unit drivers may be required to move back and forth the first movable body  110  in one direction. 
     Referring to  FIG.  4 A , the OIS driver  120  may include a first unit driver  120   a  disposed in the −X-direction of the first movable body  110  and a second unit driver  120   b  disposed in the +X-direction of  110  to compensate for shaking in the X-direction. The first unit driver  120   a  may include a first driving yoke  121   a  coupled to the first movable body  110 , and a first driving coil  122   a  coupled to the base  131 . The first unit driver  120   a  may further include a first yoke  123   a  disposed on one side of the first driving coil  122   a . The second unit driver  120   b  may include a second driving yoke  121   b  coupled to the first movable body  110  and a second driving coil  122   b  coupled to the base  131 . The second unit driver  120   b  may further include a second yoke  123   b  disposed on one side of the second driving coil  122   b.    
     Referring to  FIG.  4 A , the OIS driver  120  may include a third unit driver  120   c  disposed in the +Y-direction of the first movable body  110 , and a fourth unit driver  120   d  disposed in the −Y-direction of the first movable body  110  to compensate for the shaking in Y-direction. The third unit driver  120   c  may include a third driving yoke  121   c  coupled to the first movable body  110 , and a third driving coil  122   c  coupled to the base  131 . The third unit driver  120   c  may further include a third yoke  123   c  disposed on one side of the third driving coil  122   c . The fourth unit driver  120   d  may include a fourth driving yoke  121   d  coupled to the first movable body  110 , and a fourth driving coil  122   d  coupled to the base  131 . The fourth unit driver  120   d  may further include a fourth yoke  123   d  disposed on one side of the fourth driving coil  122   d.    
     Referring to  FIG.  4   a   , the grooves G 1  and G 2  for guiding the ball member B 1  and B 2  and the ball member B 1  and B 2  may be disposed adjacently to the corner  113   a  of the sensor holder  113 . The first groove G 1  for accommodating the first ball member B 1  and the first ball member B 1  may be disposed adjacently to the corner  113   a  of the sensor holder  113 , and the second groove G 2  for accommodating the ball member B 2  and the second ball member B 2  may also be disposed adjacently to the corner  113   a  of the sensor holder  113 . Referring to  FIG.  4 A , the first groove G 1  and the second groove G 2  may overlap each other in the optical axis O direction. 
     Referring to  FIG.  4   b   , the ball member B 1  and B 2  and the groove G 1  and G 2  may be disposed between the two neighboring corners  113   a . The ball members B 1  and B 2  and the grooves G 1  and G 2  may be disposed adjacently to the center of the side surface  113   b  connecting the two neighboring corners  113   a  to each other. For example, the second ball member B 2  and the second groove G 2  partially accommodating the second ball member B 2  may be disposed adjacently to the center of the side surface  113   b  of the sensor holder  113 . The first ball member B 1  and the first groove G 1  may be disposed adjacently to both ends of the side surface  113   b  of the sensor holder  113  as in  FIG.  4 A . In  FIG.  4 B , the first groove G 1  and the second groove G 2  may not overlap in the optical axis O direction. Accordingly, rigidity of the ball guide  141 , including both the first groove G 1  and the second groove G 2  may improve. 
     Referring to  FIG.  4   c   , three first ball members B 1 - 1 , B 1 - 2 , and B 1 - 3  may be disposed between the second movable body  140  and the fixed body  130 . Two first ball members B 1 - 1  and B 1 - 2  among the three first ball members B 1 - 1 , B 1 - 2 , and B 1 - 3  may be disposed adjacently to both ends of one side surface  113   b - 1  (e.g., the side surface oriented in the −X-direction) of the sensor holder  113 , and the other B 1 - 3  may be disposed adjacently to the center of the other side surface  113   b - 2  (e.g., the side surface oriented in the +X-direction). Accordingly, the second movable body  140  may be supported at three points by the first ball members B 1 - 1 , B 1 - 2 , and B 1 - 3 . 
     Referring to  FIG.  4   c   , three second ball members B 2 - 1 , B 2 - 2 , and B 2 - 3  may be disposed between the first movable body  110  and the second movable body  140 . Two second ball members B 2 - 1  and B 2 - 2  among the three second ball members B 2 - 1 , B 2 - 2 , and B 2 - 3  may be disposed adjacently to both ends of one side surface  113   b - 2  (e.g., the side surface oriented in the −X-direction) of the sensor holder  113 , and the other B 2 - 3  may be adjacent to the center of the other side surface  113   b - 1  (e.g., the side surface oriented in the +X-direction). Accordingly, the first movable body  110  may be supported at three points by the second ball members B 2 - 1 , B 2 - 2 , and B 2 - 3 . 
       FIGS.  5 A to  5 D  are diagrams illustrating the movement of a first movable body due to an OIS driver in  FIG.  4 A . 
     Referring to  FIG.  5 A , a current may be applied to the first driving coil  122   a  such that the first driving coil  122   a  may pull the first driving yoke  121   a  in the direction of an arrow, and accordingly, the first movable body  110  may move in the −X-direction. Referring to  FIG.  5 B , a current may be applied to the second driving coil  122   b  such that the second driving coil  122   b  may pull the second driving yoke  121   b  in the direction of an arrow, and accordingly, the first movable body  110  may move in the +X-direction. Referring to  FIG.  5 C , a current may be applied to the third driving coil  122   c  such that the third driving coil  122   c  may pull the third driving yoke  121   c  in the direction of the arrow, and accordingly, the first movable body may move in the +Y-direction. Referring to  FIG.  5 D , a current may be applied to the fourth driving coil  122   d  such that the fourth driving coil  122   d  may pull the fourth driving yoke  121   d  in the direction of the arrow, and accordingly, the first movable body  110  may move in the −Y-direction. 
       FIG.  6    is a diagram illustrating an example in which unit drivers  120   a ,  120   b ,  120   c , and  120   d  are disposed in a diagonal direction of a driving direction of an image sensor according to an example embodiment. 
     In an example embodiment, the first movable body  110  may move in two directions orthogonal to the optical axis and orthogonal to each other. For example, the first movable body  110  may move in the X-direction and the Y-direction. The OIS driver  120  may allow the first movable body  110  to move in a first direction OIS-X parallel to the horizontal side  111   c  of the image sensor  111  and in a second direction OIS-Y parallel to the vertical side  111   d  of the image sensor  111 . For example, referring to  FIG.  6   , the image sensor  111  may include a horizontal side  111   b  extending in the X-direction and a vertical side  111   c  extending in the Y-direction, and a first groove G 1  and a second groove G 1  may extend in the Y-direction and the X-direction, respectively. 
     Referring to  FIG.  6   , the unit drivers  120   a ,  120   b ,  120   c , and  120   d  may be disposed orthogonal to the optical axis O the two movement directions OIS-X and OIS-Y orthogonal to the optical axis O and orthogonal to each other. For example, the first unit driver  120   a  and the second unit driver  120   b  may be disposed on both sides of the image sensor  111  in the first diagonal direction D 1 . The third unit driver  120   c  and the fourth unit driver  120   d  may be disposed on both sides of the image sensor  111  in the second diagonal direction D 2 . 
     In an example embodiment, when the OIS driver  120  is configured to move the first movable body  110  in a first direction OIS-X and the second direction OIS-Y, the driving coil  122  and the driving yoke  121  may oppose each other in a direction between the first direction OIS-X and the second direction OIS-Y. For example, when the OIS driver  120  is configured to move the first movable body  110  in the X-direction and the Y-direction, the driving coil  122  and the driving yoke  121  may oppose each other in the angular directions D 1  and D 2 , forming 45 degrees to the X-axis or the Y-axis. 
     Even when the unit drivers  120   a ,  120   b ,  120   c , and  120   d  are disposed as illustrated in  FIG.  6   , the grooves G 1  and G 2  for guiding the ball members B 1  and B 2  and the ball members B 1  and B 2  may be disposed as in  FIG.  4 B or  4 C . 
       FIGS.  7 A to  7 D  are diagrams illustrating the movement of a first movable body due to an OIS driver in  FIG.  6   . 
     Referring to  FIG.  7 A , a current may be applied to the first driving coil  122   a  and the fourth driving coil  122   d  such that the first driving coil  122   a  and the fourth driving coil  122   d  may pull the first driving yoke  121   a  and the second driving yoke  121   b  in the direction of the arrow, and accordingly, the first movable body  110  may move in the −X-direction. Referring to  FIG.  7 B , a current may be applied to the second driving coil  122   b  and the third driving coil  122   c  such that the second driving coil  122   b  and the third driving coil  122   c  may pull the second driving yoke  121   b  and the third driving yoke  121   c  in the direction of the arrow, and accordingly, the first movable body  110  may move in the +X-direction. Referring to  FIG.  7 C , a current may be applied to the first driving coil  122   a  and the third driving coil  122   c  such that the first driving coil  122   a  and the third driving coil  122   c  may pull the first driving yoke  121   a  and the third driving yoke  121   c  in the direction of the arrow, and accordingly, the first movable body  110  may move in the +Y-direction. Referring to  FIG.  7 D , a current may be applied to the second driving coil  122   b  and the fourth driving coil  122   d  such that the second driving coil  122   b  and the fourth driving coil  122   d  may pull the second driving yoke  121   b  and the fourth driving yoke  121   d  in the direction of the arrow, and accordingly, the first movable body  110  may move in the −Y-direction. 
       FIG.  8    is a diagram illustrating an elastic member providing restoring force to a first moveable body according to an example embodiment. 
     Referring to  FIG.  8   , the OIS driver  120  may include an elastic member  160  providing a restoring force to the first movable body  110 . The elastic member  160  may be disposed between the first movable body  110  and the fixed body  130 , and when the first movable body  110  moves in one direction, the elastic member  160  may be deformed and may prove a restoring force to the first movable body  110 . 
     In an example embodiment, the elastic member  160  may be a leaf spring. In this case, both ends of the elastic member  160  may be fixed to the fixed body  130 , and may have a curved shape, curved toward the first movable body  110 . 
     In an example embodiment, four elastic members  161 ,  162 ,  163 , and  164  may be disposed to oppose each of the four side surfaces of the first movable body  110 . For example, when the first movable body  110  moves in the −X-direction, the first elastic member  161  is compressed and pushes the first movable body  110  in the +X-direction. When the first movable body  110  moves in the +X-direction, the second elastic member  162  may be compressed and may push the first movable body  110  in the −X-direction. When the first movable body  110  moves in the +Y-direction, the third elastic member  163  may be compressed and may push the first movable body  110  in the −X-direction. When the first movable body  110  moves in the −Y-direction, the fourth elastic member  164  may be compressed and may push the first movable body  110  in the +Y-direction. 
     According to the aforementioned example embodiments, the camera may provide effective optical image stabilization with low power. Alternatively, according to an example embodiment, the effect of the magnetic field of the actuator driving the image sensor affecting the electronic component disposed outside the camera may be eliminated or reduced. 
     While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.