Patent Publication Number: US-2021173224-A1

Title: Camera module

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2019-0164033 filed on Dec. 10, 2019 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. 
     BACKGROUND 
     1. Field 
     This application relates to a camera module. 
     2. Description of Related Art 
     The use of subminiature camera modules in mobile communications terminals such as smartphones, tablet PCs, laptop computers, and the like, has increased. 
     With the miniaturization of mobile communications terminals, the quality of images obtained by these terminals may be degraded because these terminals are often held by hand while images are captured. To obtain clear images despite the instability introduced into the images due to the inadvertent shaking of hands holding the terminals, a technology that compensates for the effect of shaking is required. 
     An actuator for optical image stabilization (OIS) may be used to compensate for the involuntary shaking introduced by the instability of hands holding the terminals. An OIS actuator may move a lens module in a direction, perpendicular to an optical axis direction, to compensate for the involuntary shaking. 
     A structure, in which a plurality of cameras including a wide-angle camera and a telephoto camera are mounted adjacent to a mobile terminal, has been implemented to improve the performance of camera functions. 
     However, when an OIS actuator using a magnet and a coil is employed for miniaturization and accuracy in driving, performance may be deteriorated due to magnetic interference between camera modules adjacent to each other. 
     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. 
     An actuator having a structure provided with a magnet and a coil. 
     A structure, capable of significantly reducing leakage of a magnetic field, while employing an actuator using a magnetic field and a coil for miniaturization and accurate driving. 
     A structure to significantly reduce magnetic field interference, such that a plurality of camera modules may be freely arranged even when they are disposed adjacent to each other. 
     In one general aspect, a camera module includes a carrier supported on a housing and movable in an optical axis direction, at least one frame supported on the carrier and movable, relative to the carrier, in at least one direction perpendicular to the optical axis direction, and a lens module supported on the frame. The frame is supported on the carrier such that attractive force acts in the at least one direction perpendicular to the optical axis direction. 
     The camera module may include a yoke disposed on a side surface of the housing that supports the frame, and the yoke may include a material configured to prevent leakage of a magnetic field. 
     The at least one frame may include a first frame, and the first frame may be supported on the carrier such that attractive force acts in a first direction perpendicular to the optical axis direction. 
     The lens module may be supported on the first frame such that attractive force acts in a second direction perpendicular to the optical axis direction and perpendicular to the first direction. 
     The first frame may include a first magnet and the lens module may include a second magnet, the housing may include a first yoke and a second yoke, and the first magnet and the first yoke may be arranged at a first interval along the first direction, and the second magnet and the second yoke may be arranged at a second interval along the second direction. 
     The first frame may include a first magnet and the lens module may include a second magnet, the first magnet may be magnetized to have at least N and S poles along a surface opposing the carrier along the first direction perpendicular to the optical axis direction, and the second magnet may be magnetized to have at least N and S poles along a surface opposing the carrier along the second direction perpendicular to the optical axis direction. 
     The first frame may be movable, relative to the carrier, along a direction perpendicular to the first direction, and the lens module may be movable, relative to the first frame, along a direction perpendicular to the second direction. 
     The at least one frame may include a first frame and a second frame. 
     The first frame may be closely supported to a first surface of the carrier parallel to the optical axis direction, and the second frame may be closely supported to a second surface of the carrier parallel to the optical axis direction. 
     The first frame may include a first magnet and the second frame may include a second magnet, the housing may include a first yoke and a second yoke, and the first magnet and the first yoke may be arranged at a first interval along a first direction perpendicular to the optical axis direction, and the second magnet and the second yoke may be arranged at a second interval along a second direction perpendicular to the optical axis direction. 
     The first frame may include a first magnet and the second frame may include a second magnet, and each of the first magnet and the second magnet may be magnetized to have at least N and S poles along an opposing surface of the housing along the at least one direction perpendicular to the optical axis direction. 
     The first frame and the second frame may be relatively movable along a contact surface of the carrier along the at least one direction perpendicular to the optical axis direction. 
     The lens module may include a lens barrel, including at least one lens accommodated therein, and a lens holder accommodating the lens barrel therein, and the lens holder may be interposed between the first frame and the second frame along the optical axis direction. 
     The lens holder may be configured to be movable along a direction perpendicular to the first direction, or to be movable together with the second frame along a direction perpendicular to the second direction. 
     The camera module may include rolling members disposed between the first frame and the lens holder and between the second frame and the lens holder along the optical axis direction, respectively. 
     In another general aspect, a camera module includes an autofocusing part including a carrier supported on a housing and configured to be movable in an optical axis direction and a shake correction portion including at least one frame movable, relative to the carrier, in at least one direction perpendicular to the optical axis direction and a lens module supported on the frame. The carrier and the at least one frame are configured to be movable on a surface parallel to the optical axis direction while a rolling member is interposed between a relative member and the carrier and the at least one frame. 
     In another general aspect, a camera module includes an autofocusing part including a carrier disposed on a housing to be movable in an optical axis direction, a shake correction unit including a lens module configured to be movable, relative to the carrier, in at least one direction perpendicular to the optical axis direction, and an autofocusing coil, to provide driving force to the autofocusing part, and first and second shake correction coils to provide driving force to the shake correction portion. The autofocusing coil and the first and second shake correction coils are disposed on surfaces of the housing parallel to the optical axis direction. The housing includes a plurality of yokes, respectively covering the autofocusing coil and the first and second shake correction coils to prevent leakage of a magnetic field. 
     In another general aspect, a camera module includes a first member configured to move along an optical axis direction and including a first magnet configured to generate force to move the first member along a first direction perpendicular to an optical axis; a second member configured to be coupled to the first member and including a second magnet configured to generate force to move the second member relative to the first member along a second direction perpendicular to the optical axis; and a lens barrel fixed to the first member and configured to be moved along the first direction by movement of the first member and to be moved along the second direction by movement of the second member relative to the first member. 
     The camera module may include a carrier configured to accommodate the first member and the second member and to move along the optical axis direction; and a housing including a first yoke and second yoke. The first frame and the second frame may be closely supported on a sidewall of the carrier parallel to the optical axis direction by attractive force with the first yoke and the second yoke. 
     Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an assembled perspective view of a camera module according to an example. 
         FIG. 2  is an exploded perspective view of a camera module according to an example. 
         FIG. 3  is an exploded perspective view of a housing and a carrier according to an example. 
         FIG. 4  is an exploded perspective view of a housing, a carrier, a frame, and a lens module according to an example. 
         FIG. 5  is an assembled perspective view of a housing, a carrier, a frame, and a lens module according to an example. 
         FIG. 6  is an exploded perspective view of a housing, a carrier, and a frame according to an example, when viewed from above. 
         FIG. 7  is an exploded perspective view of a housing, a carrier, and a frame according to an example, when viewed from below. 
         FIG. 8  is an exploded perspective view of a camera module according to another example. 
         FIG. 9  is an exploded perspective view of a housing and a carrier according to another example. 
         FIG. 10  is an exploded perspective view of a housing, a carrier, a frame, and a lens module according to another example. 
         FIG. 11  is an assembled perspective view of a housing, a carrier, a frame, and a lens module according to another example. 
         FIG. 12  is an exploded perspective view of a housing, a carrier, a frame, and a lens holder according to another example, when viewed from above. 
         FIG. 13  is an exploded perspective view of a housing, a carrier, a frame, and a lens holder according to another example, when viewed from below. 
     
    
    
     Throughout the drawings and the detailed description, the same reference numerals refer to the same 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 to one of ordinary skill in the art. 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 to one of ordinary skill in the art, with the exception of operations necessarily occurring in a certain order. Also, descriptions of functions and constructions that would be well known to one of ordinary skill in the art 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 so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to one of ordinary skill in the art. 
     Herein, it is noted that use of the term “may” with respect to an example or embodiment, e.g., as to what an example or embodiment may include or implement, means that at least one example or embodiment exists in which such a feature is included or implemented while all examples and embodiments are not limited thereto. 
     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. 
     Hereinafter, while examples will be described in detail with reference to the accompanying drawings, it is noted that examples are not limited to the same. 
     The various examples to a camera module, and may be applied to portable electronic devices such as mobile communications terminals, smartphones, table PCs, and the like. 
     A camera module is an optical device for capturing still or moving images. A camera module may include a lens, refracting light reflected from a subject, and a lens driving device moving the lens to adjust a focus or to compensate for the shaking of the camera module while images are captured. 
       FIG. 1  is an assembled perspective view of a camera module according to an example, and  FIG. 2  is an exploded perspective view of a camera module according to an example. 
     Referring to  FIGS. 1 and 2 , a camera module  1000  may include a housing  1100 , a lens module  1500  including a lens barrel  1510  accommodated in the housing  1100 , a lens driving device moving the lens module  1500 , and an image sensor unit  1150  converting light, incident through the lens barrel  1510 , into an electrical signal. The camera module  1000  may further include a case  1110  or an upper cover  1301  covering the housing  1100  from above. 
     The lens barrel  1510  may be a hollow cylindrical shape allowing a plurality of lenses for capturing a subject to be accommodated therein (the configuration is not limited thereto, and the lens barrel  1510  may have a partially cut exterior, and the inside of the lens barrel  1510  may be provided with a circular lens or a D-cut lens, a lens having one side partially cut), and a plurality of lenses are mounted in the lens barrel  1510 . The plurality of lenses is arranged as many as necessary depending on a design of the lens barrel  1510 , and each of the plurality of lenses has the same or different optical characteristics such as a refractive index, or the like. 
     The lens driving device moves the lens barrel  1510  in an optical axis direction or a direction perpendicular to the optical axis direction. 
     As an example, the lens driving device may move the lens barrel  1510  in an optical axis direction (a Z-axis direction) to adjust a focus, and may move the lens barrel  1510  in X-axis and Y-axis directions, perpendicular to the optical axis direction (the Z-axis direction), to correct shaking at the time of capturing an image. 
     The lens driving device includes a focusing unit (an autofocusing part) and a shake correction unit (a shake correction portion). 
     The image sensor unit  1150  converts light, incident through the lens barrel  1510 , into an electrical signal. 
     As an example, the image sensor unit  1150  may include an image sensor  1151  and a printed circuit board (PCB)  1153  connected to the image sensor  1151 , and may further include an infrared filter. 
     The filter serves to block light in a predetermined area among light incident through the lens barrel  1510 . For example, the filter may be an infrared filter, and may serve to block light in an infrared area. 
     The image sensor  1151  converts the light, incident through the lens barrel  1515 , into an electrical signal. For example, the image sensor  1151  may be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) image sensor. 
     The electrical signal, converted by the image sensor  1151 , is output as an image through a display unit of a portable electronic device. The image sensor  1151  is fixed to the printed circuit board  1153  and may be electrically connected to the printed circuit board  1153  by wire bonding or the like. 
     The lens module  1500 , including the lens barrel  1510 , and the lens driving device are accommodated in the housing  1100 . 
     As an example, the housing  1100  has a shape with an open top and bottom, and the lens module  1500  and the lens driving device may be accommodated in an internal space of the housing  1100 . The image sensor unit  1150  is disposed below the housing  1100 . 
     The case  1110  is coupled to the housing  1100  to surround an external surface of the housing  1100 , and serves to protect internal components of the camera module  1000 . In addition, the case  1110  may serve to shield electromagnetic waves. 
     As an example, the case  1110  may shield electromagnetic waves generated by the camera module  1000  such that electromagnetic waves do not affect other electronic components in the portable electronic device. 
     Since a portable electronic device is equipped with various electronic components other than the camera module, the case  1110  may shield electromagnetic waves generated by such electronic components such that the electromagnetic waves do not affect the camera module  1000 . 
     Referring to  FIGS. 2 to 4 , the focusing unit of the lens driving device according to an example is illustrated. 
     The lens driving device includes a focusing unit, moving a carrier  1300  in an optical axis direction to perform autofocusing, and a shake correction unit moving the lens module disposed inside of the carrier  1300  in a direction perpendicular to the optical axis direction, to perform shake correction. 
     The focusing unit has a structure generating driving force to move the carrier  1300 , accommodating the lens module  1500 , in the optical axis direction (the Z-axis direction). 
     A driving portion of the focusing unit includes a magnet  1320  and a coil  1330 . The magnet  1320  is mounted on the carrier  1300 . As an example, the magnet  1320  may be mounted on one surface of the carrier  1300 . 
     The coil  1330  is mounted in the housing  1100 . As an example, the coil  1330  may be mounted in the housing  1100  through a substrate  1130 . The coil  1330  may be fixed to the substrate  1130 , and the substrate  1130  may be fixed to the housing  1100  in a state in which fixing driving coils of the shake correction unit to described later are also fixed together. 
     The magnet  1320  is a movable member mounted on the carrier  1300  to move in the optical axis direction (the Z-axis direction) together with the carrier  1300 , and the coil  1330  is a fixed member fixed to the housing  1100 . However, the configuration is not limited thereto, and positions of the magnet  1320  and the coil  1330  are interchangeable with each other. 
     When power is applied to the coil  1330 , the carrier  1300  may be moved in the optical axis direction (the Z-axis direction) by electromagnetic interaction between the magnet  1320  and the coil  1330 . 
     Since the lens barrel  1510  is accommodated in the carrier  1300 , the lens barrel  1510  is also moved in the optical axis direction (the Z-axis direction) by the movement of the carrier  1300 . 
     When the carrier  1300  is moved, a rolling member  1370  is disposed between the carrier  1300  and the housing  1100  to reduce friction between the carrier  1300  and the housing  1100 . The rolling member  1370  may have a ball shape. The rolling members  1370  may be disposed on both sides of the magnet  1320 . 
     A yoke  1350  is disposed in the housing  1100 . For example, the yoke  1350  is disposed to oppose the magnet  1320  with the coil  1330  interposed therebetween. For example, the coil  1330  and the magnet  1320  are disposed to oppose each other, and the yoke  1350  is disposed on a rear surface of the coil  1330  such that the carrier  1300  is closely supported on the housing  1100  with the rolling member  1370  interposed therebetween. 
     Attractive force acts between the yoke  1350  and the magnet  1320  in a direction perpendicular to the optical axis direction (the Z-axis direction). Accordingly, the rolling member  1370  may be maintained in a state of contact with the carrier  1300  and the housing  1100  by the attractive force between the yoke  1350  and the magnet  1320 . 
     The yoke  1350  may also serve to focus magnetic force of the magnet  1320 , and may prevent magnetic flux from leaking outwardly. 
     The various examples discussed herein use a closed loop control method in which a position of the lens barrel  1510 , and the carrier  1300 , is detected and feed-backed. 
     Accordingly, a position sensor  1360  is required for closed loop control. The position sensor  1360  may be a hall sensor. 
     The position sensor  1360  is disposed inside or outside of the coil  1330 . The position sensor  1360  may be mounted on the substrate  1130  on which the coil  1330  is mounted. 
     When the camera module  1000  is powered on, an initial position of the carrier  1300  is detected by the position sensor  1360 . Then, the carrier  1300  is moved from the detected initial position to an initially set position. The term “initial position” may refer to a position of the carrier  1300  in an optical axis direction when the camera module  1000  is powered on, and the term “initially set position” may refer to a position at which a focus of the carrier  1300  is infinite. The carrier  1300  is moved from the initially set position to a target position by a driving signal of a circuit element. During a focusing process, the carrier  1300  may be moved forward and backward in the optical axis direction (the Z-axis direction) (for example, bi-directionally). 
     A magnet and a coil may be additionally provided to secure sufficient driving force during focusing. When an area, in which a magnet is mounted, is reduced with the trend for slimming of a camera module, a size of the magnet is decreased, and thus, sufficient driving force required for focusing may not be secured. 
     According to the various examples, although not illustrated, magnets may be respectively attached to the different surfaces of the carrier  1300  and coils may be respectively provided on different surfaces of the housing  1100  to oppose the magnet. Thus, sufficient driving force for focusing may be secured even when a camera module is slimmed. 
     Referring to  FIGS. 2 to 7 , a shake correction unit of the lens driving device according to an example is disclosed. 
     The lens driving device includes a focusing unit, moving the carrier  1300  in an optical axis direction to perform focusing, and a shake correction unit moving the lens module  1500  disposed inside of the carrier  1300  in a direction perpendicular to the optical axis direction, to perform shake correction. 
     The shake correction unit has a structure generating driving force to moves the lens module  1500 , accommodated in the carrier  1300 , in a first direction (an X-axis direction) and a second direction (a Y-axis direction), both perpendicular to the optical axis direction (the Z-axis direction). 
     The shake correction unit is used to correct image blurring or video shaking caused by user hand-shake, or the like, when an image or a video is captured. For example, when the shake occurs due to user hand-shake, or the like, at the time of capturing an image, a relative displacement corresponding to the shake is provided to the lens barrel  1510  to correct the shaking. As an example, the shake correction unit corrects the shaking by moving the lens barrel  1510  in a direction perpendicular to an optical axis (a Z axis). 
     The shake correction unit may include a first frame  1400 , the lens module  1500 , and a second frame  1700  sequentially provided inside of the carrier  1300 . The lens module  1500  includes a lens holder  1600  to which the lens barrel  1510  is coupled. The first frame  1400  and the second frame  1700  may be supported with a rolling member interposed between surfaces thereof parallel to the optical axis direction of the carrier  1300 . The carrier  1300  may include the upper cover  1301  covering the first frame  1400 , the lens module  1500 , and the second frame  1700  from above while they are disposed inside of the carrier  1300 . 
     A rolling member may be interposed between the first frame  1400 , the lens holder  1600 , and the second frame  1700 , sequentially provided in the optical axis direction, such that they may mutually move in a rolling motion. 
     The shake correction unit according to this example may implement a structure in which the lens barrel  1510  may be moved as the first frame  1400  and the second frame  1700  are moved in the second direction (the Y-axis direction) and the first direction (the X-axis direction), respectively. 
     For example, the lens module  1500  including the lens barrel  1510  should be moved as the first frame  1400  is moved in the second direction (the Y-axis direction) or the second frame  1700  is moved in the first direction (the X-axis direction). 
     Accordingly, the lens holder  1600 , to which the lens barrel  1510  is coupled, may be provided with a guide groove  1675  formed on at least one of a lower surface of the lens holder  1600  and an upper surface of the first frame  1400  to be elongated in the first direction (the X-axis direction) such that a rolling member  1670  disposed between the lens holder  1600  and the first frame  1400  may be freely moved in a rolling motion in the first direction (the X-axis direction), a direction in which the second frame  1700  is moved. When the lower surface of the lens holder  1600  and the upper surface of the first frame  1400  are respectively provided with guide grooves  1675 , the guide grooves  1675  may be provided as ‘┐’ or ‘└’-shaped grooves formed on edge portions of the lower surface of the lens holder  1600  and the upper surface of the first frame  1400 , respectively. The guide grooves  1675  may be vertically coupled to each other to prevent separation of the rolling member  1670 . 
     Similarly, a guide groove  1685  is formed on at least one of an upper surface of the lens holder  1600  and a lower surface of the second frame  1700  to be elongated in the second direction (the Y-axis direction) such that a rolling member  1680  disposed between the lens holder  1600  and the second frame  1700  may be freely moved in a rolling motion in the second direction (the Y-axis direction), a direction in which the first frame  1400  is moved. When the upper surface of the lens holder  1600  and the lower surface of the second frame  1700  are respectively provided with guide grooves  1685 , the guide grooves  1685  may be provided as ‘┐’ or ‘└’-shaped grooves formed on edge portions of the upper surface of the lens holder  1600  and the lower surface of the second frame  1700 , respectively. The guide grooves  1685  may be vertically coupled to each other to prevent separation of the rolling member  1680 . 
     Due to the above structure, the lens module  1500  is also moved when the first frame  1400  is moved in the second direction (the Y-axis direction) or the second frame  1700  is move in the first direction (the X-axis direction), and thus, shake may be corrected. 
     Each of the rolling members  1670  and  1680  may be provided with three rolling members to form a triangle (the configuration is not limited thereto, each of the rolling members  1670  and  1680  may be provided with four rolling member). As a first magnet  1420  and a second magnet  1720 , to be described later, are disposed to be adjacent to each other, the rolling members  1670  and  1680  may be provided on both end portions of the first magnet  1420  and the second magnet  1720 , respectively. When each of the rolling members  1670  and  1680  are provided with three rolling member, an auxiliary rolling member  1690  may be provided between opposing surfaces in the optical axis direction of the first frame  1400  and the second frame  1700 . As such, at least one of the opposing surfaces of the first frame  1400  and the second frame  1700  may be provided with a guide groove  1691  in which the auxiliary rolling member  1690  is seated. 
     The driving portion of the shake correction unit includes a first driving portion, driving the first frame  1400 , and a second driving portion driving the second frame  1700 . The first frame  1400  and the second frame  1700  are driven while being in closely supported on a surface parallel to the optical axis direction of the carrier  1300 . 
     The first frame  1400  is provided with the first magnet  1420 . The first magnet  1420  is disposed to oppose a first coil  1430 , provided in the housing  1100 , in the first direction (the X-axis direction) perpendicular to the optical axis direction. 
     The first magnet  1420  is magnetized to have at least N and S poles in a second direction (a Y-axis direction) perpendicular to a direction opposing the first coil  1430  (for example, the first magnet  1420  is magnetized such that a surface opposing the first coil  1430  has at least N and S poles in a direction perpendicular to the optical axis). Accordingly, when power is applied to the first coil  1430 , force is generated to move the first frame  1400  in the second direction (the Y-axis direction) depending on electromagnetic interaction of the first magnet  1420  and the first coil  1430 . 
     The second frame  1700  is provided with the second magnet  1720 . The second magnet  1720  is disposed to oppose a second coil  1730 , provided in the housing  1100 , in the second direction (the Y-axis direction) perpendicular to the optical axis direction and the first direction (the X-axis direction). 
     The second magnet  1720  is magnetized to have at least N and S poles in the first direction (the X-axis direction) perpendicular to a direction opposing the second coil  1730  (for example, the second magnet  1720  is magnetized such that a surface opposing the second coil  1730  has at least N and S poles in a direction perpendicular to the optical axis). Accordingly, when power is applied to the second coil  1730 , force is generated to move the second frame  1700  in the first direction (the X-axis direction) depending on electromagnetic interaction of the second magnet  1720  and the second coil  1730 . 
     The first coil  1430  and the second coil  1730  may be fixed to the substrate  1130  together with the driving coil  1330  of the focusing unit, and the substrate  1130  may be fixed to the housing  1100 . Each of the first coil  1430  and the second coil  1730  may be provided with one or two or more coils. 
     The first frame  1400  and the second frame  1700  are closely supported on a sidewall of the carrier  1300 , for example, a surface of the carrier  1300  parallel to the optical axis direction. The first frame  1400  and the second frame  1700  are supported on the sidewall of the carrier  1300  by attractive force with a first yoke  1450  and a second yoke  1750  provided in the housing  1100 . Since each of the first yoke  1450  and the second yoke  1750  may be a metallic or non-metallic magnetic material to shield a magnetic field, magnetic flux (a magnetic field) generated by a coil, a magnet, or an interface thereof may be prevented from leaking outwardly of the camera module  1000 . 
     The first yoke  1450  is disposed to oppose the first magnet  1420  with the first coil  1430  interposed therebetween, and the second yoke  1750  is disposed to oppose the second magnet  1720  with the second coil  1730  interposed therebetween. 
     For example, the first yoke  1450  and the second yoke  1750  may be disposed on rear surfaces of the first coil  1430  and the second coil  1730 , respectively. The first yoke  1450  and the second yoke  1750  may allow the first frame  1400  and the second frame  1700  to be closely supported on an internal wall of the carrier  1300  by the attractive force with the first magnet  1420  and the second magnet  1720 , respectively. 
     The first frame  1400  and the second frame  1700  may include a first rolling member  1470  and a second rolling member  1770  disposed between the first and second frames  1400  and  1700  and the internal wall of the carrier  1300  to easily move in a sliding or rolling motion on the internal wall of the carrier  1300 , respectively. 
     A surface, on which the internal walls of the first frame  1400  and the carrier  1300  oppose each other, may be provided with a first guide groove  1475  formed to be elongated in the second direction (the Y-axis direction) such that the first rolling member  1470  is easily moved in a sliding or rolling motion. A surface, on which the internal walls of the second frame  1700  and the carrier  1300  oppose each other, may be provided with a second guide groove  1775  formed to be elongated in the first direction (the X-axis direction) such that the second rolling member  1770  is easily moved in a sliding or rolling motion. 
     The first rolling member  1470  and the second rolling member  1770  may be provided with two first magnets  1420  and two second magnets  1720  on external sides of both end portions thereof, respectively (the configuration is not limited thereto, and the first rolling member  1470  and the second rolling member  1770  may be provided with three or more first magnets  1420  and three or more second magnets  1720 , respectively). 
     The first guide groove  1475  may be formed such that the movement of the first rolling member  1470  is limited only in the first direction (the X-axis direction), a direction in which the first frame  1400  is supported, and the movement or tilting of the first rolling member  1470  is not limited in the optical axis direction (the Z-axis direction) and the second direction (the Y-axis direction). For example, in addition to the movement of the first frame  1400  in the second direction (the Y-axis direction), the first frame  1400  may be tilted based on a shaft connecting the two first rolling members  1470  provided on both sides, or the first guide groove  1475  may be provided to have a width greater than a width of the first rolling member  1470  in all directions such that the rolling motion of the first rolling member  1470  is not limited (a depth of the first guide groove  1475  should be constantly maintained because the movement thereof is limited in the first direction (the X-axis direction)). 
     The second guide groove  1775  may be formed such that the movement of the second rolling member  1770  is limited only in the second direction (the Y-axis direction), a direction in which the second frame  1700  is supported, and the movement of the second rolling member  1770  is not limited in the optical axis direction (the Z-axis direction) and the first direction (the Z-axis direction). For example, in addition to the movement of the second frame  1700  in the first direction (the X-axis direction), the second frame  1700  may be tilted based on a shaft connecting the two second rolling members  1770  provided on both sides, or the second guide groove  1775  may be provided to have a width greater than a width of the second rolling member  1770  in all directions such that the rolling motion of the second rolling member  1770  is not limited (a depth of the second guide groove  1775  should be constantly maintained because the movement thereof is limited in the second direction (the Y-axis direction)). 
     The first and second magnets  1420  and  1720  of the shake correction driving unit including the first driving unit and the second driving unit are mounted on the first and second frames  1400  and  1700 , respectively. The first and second coils  1430  and  1730 , respectively opposing the first and second magnets  1420  and  1720 , are mounted in the housing  1100 . For ease of description, in a portion of the drawings, the first and second coils  1430  and  1730  are illustrated as being disposed on a side of the carrier  1300 . However, referring to  FIG. 2 , both of the first and second coils  1430  and  1730  may be mounted in the housing  1100 . 
     The first and second magnets  1420  and  1720  are movable members moved together with the lens module  1500  in a direction perpendicular to the optical axis (the Z-axis), and the first and second coils  1430  and  1730  are fixed members fixed to the housing  1100 . However, the configuration is not limited thereto, and positions of the first and second magnets  1420  and  1720  and the first and second coils  1430  and  1730  are interchangeable with each other. 
     The shake correction driving unit may use a closed loop control method in which the positions of the first and second frames  1400  and  1700  are continuously sensed and reflected on driving. Accordingly, the first and second frames  1400  and  1700  may include first and second position sensors  1460  and  1760 , opposing the first and second magnets  1420  and  1720 , to sense the positions of the first and second frames  1400  and  1700 . In this case, the first and second position sensors  1460  and  1760  may be provided inside or by the first and second coils  1430  and  1730  of the substrate  1130 . 
     This example includes all structures in which one or two or more first and second coils  1430  and  1730 , opposing the first and second magnets  1420  and  1720  provided on the first and second frames  1400  and  1700 , are provided, respectively. When two or more first and second coils  1430  and  1730  are provided, the amount of magnetic flux may be adjusted to more efficiently prevent leakage of the magnetic flux. 
     In the camera module  1000  according to this example, side surfaces of the housing  1100  using a VCM actuator using a magnet and a coil may all be finished with a yoke, capable of preventing leakage of magnetic flux. As a result, leakage of a magnetic field may be effectively prevented. 
       FIG. 1  is an assembled exploded perspective view of a camera module according to another example, and  FIG. 8  is an exploded perspective view of the camera module according to another example. 
     Referring to  FIGS. 1 and 8 , a camera module  2000  includes a housing  2100 , a lens module  2500  including a lens barrel  2510  accommodated in the housing  2100 , a lens driving device moving the lens module  2500 , and an image sensor unit  2150  converting light, incident through the lens barrel  2510 , into an electrical signal. The camera module  2000  may further include a case  2110  or an upper cover  2301  covering the housing  2100  from above. 
     The lens barrel  2510  may have a hollow cylindrical shape allowing a plurality of lenses for capturing a subject to be accommodated therein (the configuration is not limited thereto, and the lens barrel  2510  may have a partially cut exterior, and the inside of the lens barrel  2510  may be provided with a circular lens or a D-cut lens which is a lens having one side partially cut), and a plurality of lenses are mounted in the lens barrel  2510 . The plurality of lenses is arranged in as large a number as necessary, depending on a design of the lens barrel  2510 , and each of the plurality of lenses has the same or different optical characteristics such as refractive index, or the like. 
     The lens driving device moves the lens barrel  2510  in an optical axis direction or a direction perpendicular to the optical axis direction. 
     As an example, the lens driving device may move the lens barrel  2510  in an optical axis direction (a Z-axis direction) to adjust a focus, and may move the lens barrel  2510  in X-axis and Y-axis directions, perpendicular to the optical axis direction (the Z-axis direction), to correct shaking at the time of capturing an image. 
     The lens driving device includes a focusing unit (an autofocusing part) and a shake correction unit (a shake correction portion). 
     The image sensor unit  2150  converts light, incident through the lens barrel  2510 , into an electrical signal. 
     As an example, the image sensor unit  2150  may include an image sensor  2151  and a printed circuit board (PCB)  2153  connected to the image sensor  2151 , and may further include an infrared filter. 
     The lens module  2500 , including the lens barrel  2510 , and the lens driving device are accommodated in the housing  2100 . 
     As an example, the housing  2100  has a shape with an open top and bottom, and the lens module  2500  and the lens driving device may be accommodated in an internal space of the housing  2100 . The image sensor unit  2150  is disposed below the housing  2100 . 
     The case  2110  is coupled to the housing  2100  to surround an external surface of the housing  2100 , and serves to protect internal components of the camera module  2000 . The case  2110  may serve to shield electromagnetic waves. 
     As an example, the case  2110  may shield electromagnetic waves generated by the camera module  2000  such that electromagnetic waves do not affect other electronic components in the portable electronic device. 
     Since a portable electronic device is equipped with various electronic components other than the camera module  2000 , the case  2110  may shield electromagnetic waves generated by such electronic components such that the electromagnetic waves do not affect the camera module. 
     Referring to  FIGS. 8 to 13 , a focusing unit of the lens driving device according to another example is illustrated. 
     The lens driving device includes a focusing unit, moving a carrier  2300  in an optical axis direction to perform autofocusing, and a shake correction unit moving the lens module  2500  disposed inside of the carrier  2300  in a direction perpendicular to the optical axis direction, to perform shake correction. 
     The focusing unit has a structure generating driving force to move the carrier  2300 , accommodating the lens module  2500 , in the optical axis direction (the Z-axis direction). 
     A driving portion of the focusing unit includes a magnet  2320  and a coil  2330 . The magnet  2320  is mounted on the carrier  2300 . As an example, the magnet  2320  may be mounted on one surface of the carrier  2300 . 
     The coil  2330  is mounted in the housing  2100 . As an example, the coil  2330  may be mounted in the housing  2100  through a substrate  2130 . The coil  2330  may be fixed to the substrate  2130 , and the substrate  2130  may be fixed to the housing  2100  in a state in which fixing driving coils of the shake correction unit, to described later, are also fixed together. 
     The magnet  2320  is a movable member mounted on the carrier  2300  to move in the optical axis direction (the Z-axis direction) together with the carrier  2300 , and the coil  2330  is a fixed member fixed to the housing  2100 . However, the configuration is not limited thereto, and positions of the magnet  2320  and the coil  2330  are interchangeable with each other. 
     When power is applied to the coil  2330 , the carrier  2300  may be moved in the optical axis direction (the Z-axis direction) by electromagnetic interaction between the magnet  2320  and the coil  2330 . 
     Since the lens barrel  2510  is accommodated in the carrier  2300 , the lens barrel  2510  is also moved in the optical axis direction (the Z-axis direction) by the movement of the carrier  2300 . 
     When the carrier  2300  is moved, a rolling member  2370  is disposed between the carrier  2300  and the housing  2100  to reduce friction between the carrier  2300  and the housing  2100 . The rolling member  2370  may have a ball shape. The rolling members  2370  may be disposed on both sides of the magnet  2320 . 
     A yoke  2350  is disposed in the housing  2100 . For example, the yoke  2350  is disposed to oppose the magnet  2320  with the coil  2330  interposed therebetween. For example, the coil  2330  and the magnet  2320  are disposed to oppose each other, and the yoke  2350  is disposed on a rear surface of the coil  2330  such that the carrier  2300  is closely supported on the housing  2100  with the rolling member  2370  interposed therebetween. 
     An attractive force acts between the yoke  2350  and the magnet  2320  in a direction perpendicular to the optical axis direction (the Z-axis direction). Accordingly, the rolling member  2370  may be maintained in a state of contact with the carrier  2300  and the housing  2100  by the attractive force between the yoke  2350  and the magnet  2320 . 
     The yoke  2350  may also serve to focus magnetic force of the magnet  2320 , and may prevent magnetic flux from leaking outwardly. 
     The various examples use a closed loop control method in which a position of the lens barrel  2510 , and the carrier  2300 , is detected and feed-backed. 
     Accordingly, a position sensor  2360  is required for closed loop control. The position sensor  2360  may be a hall sensor. 
     The position sensor  2360  is disposed inside or outside of the coil  2330 . The position sensor  2360  may be mounted on the substrate  2130  on which the coil  2330  is mounted. 
     A magnet and a coil may be additionally provided to secure sufficient driving force during focusing. When an area, in which a magnet is mounted, is reduced with the trend for slimming of a camera module, a size of the magnet is decreased, and thus, sufficient driving force required for focusing may not be secured. 
     According to the various examples, although not illustrated, magnets may be respectively attached to the different surface of the carrier  2300  and coils may be respectively provided on different surfaces of the housing  2100  to oppose the magnet. Thus, sufficient driving force for focusing may be secured even when a camera module is slimmed. 
     Referring to  FIGS. 8 to 13 , a shake correction unit of the lens driving device according to an example is disclosed. 
     The lens driving device includes a focusing unit, moving the carrier  2300  in an optical axis direction to perform focusing, and a shake correction unit moving the lens module  2500  disposed inside of the carrier  2300  in a direction perpendicular to the optical axis direction, to perform shake correction. 
     The shake correction unit has a structure generating driving force to move the lens module  2500 , accommodated in the carrier  2300 , in a first direction (an X-axis direction) and a second direction (a Y-axis direction), perpendicular to the optical axis direction (the Z-axis direction). 
     The shake correction unit is used to correct image blurring or video shaking caused by user hand-shake, or the like, when an image or a video is captured. For example, when the shake occurs due to user hand-shake, or the like, at the time of capturing an image, a relative displacement corresponding to the shake is provided to the lens barrel  2510  to correct the shaking. As an example, the shake correction unit corrects the shaking by moving the lens barrel  2510  in a direction perpendicular to an optical axis (a Z axis). 
     The shake correction unit may include a frame  2400  and the lens module  2500  sequentially provided inside of the carrier  2300 . The lens module  2500  includes a lens holder  2700  to which the lens barrel  2510  is coupled. The carrier  2300  may include the upper cover  2301  covering the frame  2400  and the lens module  2500  from above while they are disposed inside of the carrier  2300 . 
     The shake correction unit according to this example may implement a structure in which the lens barrel  2510  may be moved as the frame  2400  and the lens holder  2700  are moved in the second direction (the Y-axis direction) and the first direction (the X-axis direction), respectively. 
     For example, the lens holder  2700 , to which the lens barrel  2510  is fixed, is moved when the frame  2400  is moved in the second direction (the Y-axis direction) or the lens holder  2700  is moved in the first direction (the X-axis direction). For example, the lens barrel  2510  is moved with the movement of the lens holder  2700  because the lens barrel  2510  is fixed to the lens holder  2700 , and is moved together with the frame  2400  even when the frame  2400  is moved because the lens holder  2700  is a member moved while being supported on a side surface of the frame  2400 . 
     Due to the above structure, the lens barrel  2510  is also moved when the frame  2400  is moved in the second direction (the Y-axis direction) or the lens holder  2700  is moved in the first direction (the X-axis direction), and thus, shake may be corrected. 
     A driving portion of the shake correction unit includes a first driving portion, driving the frame  2400 , and a second driving portion driving the lens holder  2700 . The frame  2400  is driven while being closely supported on a surface parallel to an optical axis direction of the carrier  2300 , and the lens holder  2700  is driven while being closely supported on a surface parallel to an optical axis direction of the frame  2400 . 
     The frame  2400  includes a first magnet  2420 . The first magnet  2420  is disposed to oppose a first coil  2430 , provided in the housing  2100 , in the first direction (the X-axis direction) perpendicular to the optical axis direction. 
     The first magnet  2420  is magnetized to have at least N and S poles in a second direction (a Y-axis direction) perpendicular to a direction opposing the first coil  2430  (for example, the first magnet  2420  is magnetized such that a surface opposing the first coil  2430  has at least N and S poles in a direction perpendicular to the optical axis). Accordingly, when power is applied to the first coil  2430 , force is generated to move the frame  2400  in the second direction (the Y-axis direction) depending on electromagnetic interaction of the first magnet  2420  and the first coil  2430 . 
     The lens holder  2700  is provided with a second magnet  2720 . The second magnet  2720  is disposed to oppose a second coil  2730 , provided in the housing  2100 , in the second direction (the Y-axis direction) perpendicular to the optical axis direction and the first direction (the X-axis direction). 
     The second magnet  2720  is magnetized to have at least N and S poles in the first direction (the X-axis direction) perpendicular to a direction opposing the second coil  2730  (for example, the second magnet  2720  is magnetized such that a surface opposing the second coil  2730  has at least N and S poles in a direction perpendicular to the optical axis). Accordingly, when power is applied to the second coil  2730 , force is generated to move the lens holder  2700  in the first direction (the X-axis direction) depending on electromagnetic interaction of the second magnet  2720  and the second coil  2730 . 
     The first coil  2430  and the second coil  2730  may be fixed to the substrate  2130  together with the driving coil  2330  of the focusing unit, and the substrate  2130  may be fixed to the housing  2100 . 
     The frame  2400  is closely supported on a sidewall of the carrier  2300 , for example, a surface of the carrier  2300  parallel to the optical axis direction. The lens holder  2700  is closely supported on a sidewall of the frame  2400 , for example, a surface of the frame  2400  parallel to the optical axis direction. 
     The frame  2400  and the lens holder  2700  are supported on sidewalls of the carrier  2300  and the frame  2400  by attractive force with a first yoke  2450  and a second yoke  2750  provided in the housing  2100 . Since each of the first yoke  2450  and the second yoke  2750  may be a metallic or non-metallic magnetic material to shield a magnetic field, magnetic flux (a magnetic field) generated by a coil, a magnet, or an interface thereof may be prevented from leaking outwardly of the camera module  2000 . 
     The first yoke  2450  is disposed to oppose the first magnet  2420  with the first coil  2430  interposed therebetween, and the second yoke  2750  is disposed to oppose the second magnet  2720  with the second coil  2730  interposed therebetween. 
     The first yoke  2450  and the second yoke  2750  may be disposed on rear surfaces of the first coil  2430  and the second coil  2730 , respectively. The first yoke  2450  and the second yoke  2750  may allow the first frame  2400  and the lens holder  2700  to be closely supported on internal walls of the carrier  2300  and the frame  2400  by the attractive force with the first magnet  2420  and the second magnet  2720 , respectively. 
     The frame  2400  may include a first rolling member  2470  between the internal wall of the carrier  2300  and the frame  2400  to be easily moved in a sliding or rolling motion. The lens holder  2700  may include a second rolling member  2770  between the internal wall of the frame  2400  and the lens holder  2700  to be easily moved in a sliding or rolling motion. 
     A surface, on which the internal walls of the frame  2400  and the carrier  2300  oppose each other, may be provided with a first guide groove  2475  formed to be elongated in the second direction (the Y-axis direction) such that the first rolling member  2470  is easily moved in a sliding or rolling motion on at least one of the surfaces. A surface, on which the internal walls of the lens holder  2700  and the carrier  2300  oppose each other, may be provided with a second guide groove  2775  formed to be elongated in the first direction (the X-axis direction) such that the second rolling member  2770  is easily moved in a sliding or rolling motion on at least one of the surfaces. 
     The first rolling member  2470  and the second rolling member  2770  may be provided with one or two first magnets  2420  and one or two second magnets  2720  on external sides of both end portions thereof, respectively, to form a triangle or a quadrangle. Each rolling member may be provided with one rolling member in each guide groove. 
     The first and second magnets  2420  and  2720  of the shake correction driving unit including the first driving unit and the second driving unit are mounted on the first frame  2400  and the lens holder  2700 , respectively. The first and second coils  2430  and  2730 , respectively opposing the first and second magnets  2420  and  2720 , are mounted in the housing  2100 . For ease of description, in a portion of the drawings, the first and second coils  2430  and  2730  are illustrated as being disposed on a side of the carrier  2300 . However, referring to  FIG. 8 , both of the first and second coils  2430  and  2730  may be mounted in the housing  2100 . 
     The first and second magnets  2420  and  2720  are movable members moved together with the lens module  2500  in a direction perpendicular to the optical axis (the Z-axis), and the first and second coils  2430  and  2730  are fixed members fixed to the housing  2100 . However, the configuration is not limited thereto, and positions of the first and second magnets  2420  and  2720  and the first and second coils  2430  and  2730  are interchangeable with each other. 
     The shake correction driving unit may use a closed loop control method in which the positions of the frame  2400  and the lens holder  2700  are continuously sensed and reflected on driving. Accordingly, the frame  2400  and the lens holder  2700  may include first and second position sensors  2460  and  2760 , opposing the first and second magnets  2420  and  2470 , to sense the positions of the frames  2400  and the lens holder  2700 . In this case, the first and second position sensors  2460  and  2760  may be provided inside or by the first and second coils  2430  and  2730  of the substrate  2130 . 
     This example includes all structures in which one or two or more first and second coils  2430  and  2730 , opposing the first and second magnets  2420  and  2720  provided on the frame  2400  and the lens holder  2700 , are provided, respectively. When two or more first and second coils  2430  and  2730  are provided, the amount of magnetic flux may be adjusted to more efficiently prevent leakage of the magnetic flux. 
     In the camera module  2000  according to this example, all side surfaces of the housing  2100  using a VCM actuator using a magnet and a coil may be finished with a yoke capable of preventing leakage of magnetic flux. As a result, magnetic field leakage of the camera module  2000  may be effectively prevented. 
     As described above, leakage of a magnetic field may be significantly reduced while employing an actuator using a magnet and a coil. Thus, miniaturization and accurate driving of a camera module may be achieved. 
     In addition, even when camera modules are arranged to be adjacent to each other, magnetic field interference may be significantly reduced. Thus, the camera modules may be freely arranged. 
     While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in forms 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.