Patent Publication Number: US-11036061-B2

Title: Reflecting module for optical image stabilization and camera module including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of U.S. application Ser. No. 15/809,423 filed on Nov. 10, 2017, now U.S. Pat. No. 10,394,046 issued on Aug. 27, 2019, which claims the benefit of priority under 35 USC § 119(a) to Korean Patent Application No. 10-2017-0073169 filed on Jun. 12, 2017, in the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes. 
    
    
     BACKGROUND 
     1. Field 
     The description relates to a reflecting module for optical image stabilization (OIS) and a camera module including the same. 
     2. Description of Related Art 
     Recently, camera modules have been generally installed in portable electronic devices such as tablet personal computers (PCs), laptop computers, and the like, in addition to smartphones, and an auto-focusing function, an optical image stabilization (OIS) function, a zoom function, and the like, have been added to camera modules for mobile terminals. 
     However, in order to implement various functions, the structures of camera modules have become relatively complicated and the sizes of camera modules have increased, resulting in difficulty in mounting camera modules in portable electronic devices in which camera modules are to be mounted. 
     In addition, when a lens or an image sensor is directly moved for the purpose of optical image stabilization, both a weight of the lens or of the image sensor itself, and weights of other members to which the lens or the image sensor is attached, should be considered, and a certain level of driving force or more is thus required, resulting in increased power consumption. 
     SUMMARY 
     In one general aspect, a reflecting module for optical image stabilization (OIS) includes a housing, a rotation holder supported by a sidewall of the housing through a rotation frame, a reflecting member disposed on the rotation holder, a driving part configured to provide driving force to the rotation holder such that the rotation holder is moved relative to the housing, and a pulling yoke disposed in the housing so that the rotation holder is supported by the sidewall of the housing by attractive force between the pulling yoke and a magnet disposed on a lower surface of the rotation holder. 
     The rotation frame may be rotatable around one axis parallel to a reflecting surface of the reflecting member with respect to the housing, and the rotation holder may be rotatable around another axis parallel to the reflecting surface of the reflecting member and approximately perpendicular to the one axis with respect to the rotation frame. 
     The rotation frame may move together with the rotation holder when the rotation frame is rotated around the one axis, and the rotation holder may rotate relative to the rotation frame when the rotation holder is rotated around the other axis. 
     The rotation frame may surround an edge of the rotation holder and the rotation holder may be partially disposed on an edge of the rotation frame and be rotatable within the rotation frame. 
     A set of ball bearings aligned in the one axis direction may be disposed between an edge of the rotation frame and the sidewall of the housing. 
     Seating grooves into which the ball bearings are inserted may be disposed between the edge of the rotation frame and the sidewall of the housing. 
     A set of ball bearings aligned in the other axis direction may be disposed between the rotation holder and an edge of the rotation frame. Seating grooves into which the ball bearings are inserted may be disposed between the rotation holder and the edge of the rotation frame. 
     The ball bearings may be integral ball bearings provided integral with either one of the rotation frame, in the edge of the rotation frame, and the housing, in the sidewall of the housing, and seating grooves into which the integral ball bearings are disposed may be provided in the edge of one of the rotation frame and the sidewall of the housing in which the ball bearings are not provided. 
     The ball bearings may be integral ball bearings provided integral with either one of the rotation holder, in an edge of the rotation holder, and the rotation frame, in an edge of the rotation frame, and seating grooves into which the integral ball bearings are inserted may be provided in one of the edge of the rotation holder and the rotation frame in which the ball bearings are not provided. 
     The integral ball bearings may be any one of a spherical shape, a hemispherical shape, a semi-cylindrical shape, and a rounded protrusion shape. 
     The seating grooves provided in the edge of the rotation frame or the sidewall of the housing may have a round shape or a poly-pyramidal shape. 
     The integral ball bearings may be any one of a spherical shape, a hemispherical shape, a semi-cylindrical shape, and a rounded protrusion shape. 
     The seating grooves may be provided in the edge of the rotation holder or the rotation frame and may have a round shape or a poly-pyramidal shape. 
     In one general aspect, a camera module includes a lens module including lenses and a reflecting module for OIS disposed in front of the lens module and configured to change the path of incident light so that the light is directed toward the lens module. The optical axis of the lenses may be generally perpendicular to the direction of the incident light to the camera module. A portable electronic device may include the camera module. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of the description will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view illustrating a portable electronic device according to an embodiment in the present disclosure; 
         FIG. 2  is a perspective view illustrating a camera module according to an embodiment in the present disclosure; 
         FIG. 3  is a cross-sectional view illustrating the camera module according to an embodiment in the present disclosure; 
         FIG. 4  is an exploded perspective view illustrating the camera module according to an embodiment in the present disclosure; 
         FIG. 5  is an exploded perspective view illustrating a reflecting module of the camera module according to an embodiment in the present disclosure; 
         FIG. 6  is a bottom view illustrating a rotation frame and a rotation holder of the camera module according to an embodiment in the present disclosure; 
         FIGS. 7A through 7C  are schematic views illustrating a manner in which the rotation holder according to an embodiment in the present disclosure is rotated around a first axis; 
         FIGS. 8A through 8C  are schematic views illustrating a manner in which the rotation holder according to an embodiment is rotated around a second axis; 
         FIG. 9  is a cross-sectional view illustrating the camera module according to a an embodiment; 
         FIG. 10  is an exploded perspective view illustrating the camera module according to an embodiment; 
         FIG. 11  is an exploded perspective view illustrating a reflecting module of the camera module according to an embodiment; 
         FIG. 12  is a bottom view illustrating a rotation frame and a rotation holder of the camera module according to an embodiment; 
         FIGS. 13A through 13C  are schematic views illustrating a manner in which the rotation holder according to an embodiment is rotated around a first axis; 
         FIGS. 14A through 14C  are schematic views illustrating a manner in which the rotation holder according to an embodiment is rotated around a second axis; and 
         FIG. 15  is a perspective view illustrating a portable electronic device according to an embodiment in the present disclosure. 
     
    
    
     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 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 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. 
     Hereinafter, embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of a portable electronic device according to an embodiment. 
     Referring to  FIG. 1 , a portable electronic device  1  according to an embodiment may be a portable electronic device such as a mobile communications terminal, a smartphone, a tablet personal computer (PC), or the like, in which a camera module  1000  is mounted. 
     As illustrated in  FIG. 1 , the portable electronic device  1  is provided with the camera module  1000  to capture an image of a subject. 
     In an embodiment, the camera module  1000  includes lenses, and the optical axis (a Z axis) of each of the lenses is directed in a direction perpendicular to a thickness direction (a Y-axis direction or a direction from a front surface of the portable electronic device to a rear surface thereof or an opposite direction to the direction from the front surface of the portable electronic device to the rear surface thereof) of the portable electronic device  1 . 
     As an example, the optical axis (the Z axis) of each of the lenses included in the camera module  1000  is in a width or length direction of the portable electronic device  1  rather than the thickness direction of the portable electronic device  1  (as an example, a structure in which the lenses are stacked in the width direction is illustrated in  FIG. 1 ). 
     Therefore, even though the camera module  1000  has functions including an auto-focusing (AF) function, a zoom function, an optical image stabilization (hereinafter, referred to as OIS) function, thickness of the portable electronic device  1  is not increased. Therefore, the portable electronic device  1  may be miniaturized. 
     The camera module  1000  according to an embodiment may have at least one of the AF function, the zoom function, and the OIS function. 
     Since the camera module  1000  including the AF function, the zoom function, the OIS function, and the like, needs to include various components, a size of the camera module is increased as compared to a general camera module. 
     When the size of the camera module  1000  is increased, a problem occurs in miniaturizing the portable electronic device  1  in which the camera module  1000  is mounted. 
     For example, when the number of stacked lenses in the camera module is increased for the purpose of the zoom function and stacked lenses are formed in the camera module in the thickness direction of the portable electronic device, thickness of the portable electronic device is increased, depending on the number of stacked lenses. Therefore, when the thickness of the portable electronic device is not increased, the number of stacked lenses may not be sufficiently secured, such that zoom performance deteriorates. 
     In addition, an actuator moving a lens group in an optical axis direction or a direction perpendicular to the optical axis needs to be installed in order to implement the AF function and the OIS function, and when the optical axis (the Z axis) of the lens group is in the thickness direction of the portable electronic device, the actuator moving the lens group needs also to be installed in the thickness direction of the portable electronic device. Therefore, thickness of the portable electronic device is increased. 
     However, in the camera module  1000  according to an embodiment, the optical axis (the Z axis) of each of the lenses is disposed perpendicularly to the thickness direction of the portable electronic device  1 . Therefore, even though the camera module  1000  having the AF function, the zoom function, and the OIS function is mounted in the portable electronic device  1 , the portable electronic device  1  is miniaturized. 
       FIG. 2  is a perspective view of a camera module according to embodiments, and  FIG. 3  is a cross-sectional view taken along line I-I′ of the camera module according to an embodiment. 
     Referring to  FIGS. 2 and 3 , the camera module  1001  according to an embodiment includes a reflecting module  1100  for OIS (hereinafter, referred to as a ‘reflecting module’), a lens module  1200 , and an image sensor module  1300  in a case  1010 . 
     The reflecting module  1100  changes the direction of light. As an example, the direction of light incident through an opening  1031  of a cover  1030  covering an upper portion of the camera module  1001  is changed by the reflecting module  1100  so that the light is directed toward the lens module  1200 . To this end, the reflecting module  1100  includes the reflecting member  1110  reflecting the light. A path of the light incident to the reflecting module  1100  is changed by the reflecting member  1110 . 
     Therefore, a path of the light incident through the opening  1031  is changed by the reflecting module  1100  so that the light is directed toward the lens module  1200 . For example, a path of light incident in the thickness direction (the Y-axis direction) of the camera module  1001  may be changed by the reflecting module  1100  to coincide with the optical axis direction (a Z-axis direction). 
     The lens module  1200  includes lenses through which the light which direction has been changed by the reflecting module  1100  passes, and the image sensor module  1300  may include an image sensor  1310  converting the light passing through the lenses into an electrical signal and a printed circuit board  1320  on which the image sensor  1310  is mounted. In addition, the image sensor module  1300  may include an optical filter  1340  filtering the light incident from the lens module  1200  thereto. The optical filter  1340  may be an infrared cut-off filter. 
     In the case  1010 , the reflecting module  1100  is provided in front of the lens module  1200 , and the image sensor module  1300  is provided behind the lens module  1200 . 
       FIG. 4  is an exploded perspective view of the camera module according to an embodiment,  FIG. 5  is an exploded perspective view of a reflecting module of the camera module according to an embodiment, and  FIG. 6  is a bottom view of a rotation frame and a rotation holder of the camera module according to an embodiment. 
     Referring to  FIGS. 2 through 6 , the camera module  1001  according to an embodiment includes the reflecting module  1100 , the lens module  1200 , and the image sensor module  1300  in the case  1010 . 
     The case  1010  includes the reflecting module  1100 , the lens module  1200 , and the image sensor module  1300  sequentially provided from one side thereof to the other side thereof. The case  1010  has an internal space into which the reflecting module  1100 , the lens module  1200 , and the image sensor module  1300  are inserted (the image sensor module  1300  may be attached to an outer portion of the case  1010 ). 
     Here, as illustrated in the drawings, the case  1010  is entirely integrally provided so that both of the reflecting module  1100  and the lens module  1200  are inserted into the internal space of the case  1010 . In addition, the case  1010  may be provided integrally with a housing  1150  of the reflecting member  1100 , such that the other components of the reflecting module  1100  are in the case  1010  (in this example, the case  1010  and the housing  1150  are integrally formed). Alternatively, the reflecting module  1100  and the lens module  1200  may be separately provided, and are assembled and connected to each other to form the case  1010 . 
     In addition, the case  1010  may be covered by the cover  1030  so that the internal space of the case  1010  is not viewed. 
     The cover  1030  has an opening  1031  through which light is incident, and a moving direction of the light incident through the opening  1031  is changed by the reflecting module  1100 , such that the light is incident to the lens module  1200 . The cover  1030  is integrally provided to cover the entire case  1010 , or is provided as separate members each covering the reflecting module  1100  and the lens module  1200 . 
     To this end, the reflecting module  1100  includes the reflecting member  1110  reflecting the light. In addition, the light incident to the lens module  1200  passes through the lenses and is then converted into and stored as an electrical signal by the image sensor  1310 . 
     The case  1010  includes the reflecting module  1100  and the lens module  1200  disposed in the internal space thereof. Therefore, in the internal space of the case  1010 , a space in which the reflecting module  1100  is disposed and a space in which the lens module  1200  is disposed may be distinguished from each other by protruding walls  1007  (however, the space in which the reflecting module  1100  is disposed and the space in which the lens module  1200  is disposed may be provided in one space without being separately distinguished from each other). In addition, the reflecting module  1100  may be provided in front of the protruding walls  1007 , and the lens module  1200  may be provided behind the protruding walls  1007 . The protruding walls  1007  may protrude from opposite sides of the case  1010  to the internal space. 
     In addition, the case  1010  includes a first driving part  1170  and a second driving part  1240  each provided in order to drive the reflecting module  1100  and the lens module  1200 . The first driving part  1170  includes coils  1171   b ,  1173   b ,  1175   b , and  1177   b  for driving the reflecting module  1100 , and the second driving part  1240  includes coils  1241   b  and  1243   b  for driving the lens module  1200 . In addition, the coils  1171   b ,  1173   b ,  1175   b ,  1177   b ,  1247   1241   b , and  1243   b  are provided in the housing  1150  and the case  1010 , respectively, in a state in which they are mounted on boards  1160  and  1260 , respectively. 
     In addition, the housing  1150  is provided with a through-hole  1151  so that coils  1171   b ,  1173   b ,  1175   b , and  1177   b  of the first driving part  1170  are exposed to an inner portion of the housing  1150 , and are provided with through-holes  1018  and  1019  so that the coils  1241   b  and  1243   b  of the second driving part  1240  are exposed to the internal space in order to drive the case  1010 . 
     In addition, the boards  1160  and  1260  on which the coils  1171   b ,  1173   b ,  1175   b ,  1177   b ,  1247   1241   b , and  1243   b  are mounted may be flexible printed circuit boards (FPCBs) or rigid PCBs (RPCBs), and when the boards  1160  and  1260  are the FPCBs, reinforcing plates (not illustrated) may be provided on lower surfaces of the boards in order to reinforce rigidity of the boards. 
     The reflecting module  1100  changes the path of the light incident thereto through the opening  1031 . When an image or a moving picture is captured, the image may be blurred or the moving picture may be shaken due to hand-shake, or the like, of a user. The reflecting module  1100  corrects the hand-shake of the user by moving a rotation holder  1120  on which the reflecting member  1110  is mounted. For example, when a shake is generated at the time of capturing the image or the moving picture due to the hand-shake, or the like, of the user, a relative displacement corresponding to the shake is provided to the rotation holder  1120  to compensate for the shake. 
     In addition, in an embodiment, the OIS function is implemented by the movement of the rotation holder  1120  having a relatively low weight due to absence of lenses and power consumption is thus significantly reduced. 
     That is, in an embodiment, the light in which the OIS is performed is incident to the lens module  1200  by changing the direction of the light by the movement of the rotation holder  1120  on which the reflecting member  1110  is provided without moving the lens barrel including the lenses or the image sensor in order to implement the OIS function. 
     The reflecting module  1100  includes the housing  1150 , the reflecting member  1110 , the rotation holder  1120  having the reflecting member  1110  mounted thereon and supported by a sidewall of the housing  1150  in a state in which a rotation frame  1130  is disposed therebetween, the board  1160  coupled to the housing  1150 , and the first driving part  1170  including coils  1171   b ,  1173   b ,  1175   b , and  1177   b  and hall sensors  1171   c  and  1175   c  provided on the board  1160 , magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  are provided in the rotation holder  1120 , and a pulling yoke  1190  is provided in the housing  1150  allowing the rotation holder  1120  to be supported by the sidewall of the housing  1150  by attractive force between the pulling yoke  1190  and the magnets  1171   a ,  1173   a ,  1175   a , and  1177   a . The pulling yoke  1190  is attached to a bottom surface of the board  1160 , that is, the other surface of the board  1160  opposing one surface of the board  1160  on which the coils  1171   b ,  1173   b ,  1175   b , and  1177   b  are mounted. The reflecting module includes a cover  1180  disposed on the housing  1150  and having an opening  1181  through which the reflecting member  1110  is exposed. 
     The reflecting member  1110  changes the direction of the light. For example, the reflecting member  1110  may be a mirror or a prism reflecting the light (a case in which the reflecting member  1110  is a mirror is illustrated in the drawings associated with an embodiment for convenience of explanation). 
     The reflecting member  1110  is fixed to the rotation holder  1120 . The rotation holder  1120  has a mounted surface  1123  on which the reflecting member  1110  is mounted. 
     The mounted surface  1123  of the rotation holder  1120  is an inclined surface so that the path of the light is changed. For example, the mounted surface  1123  has an inclined surface inclined with respect to the optical axis (the Z axis) of each of the lenses by 45°. In addition, the inclined surface of the rotation holder  1120  is directed toward the opening  1031  of the cover  1030  through which the light is incident. 
     The rotation holder  1120  on which the reflecting member  1110  is mounted is movably accommodated in an internal space of the housing  1150 . The rotation holder  1120  may be rotated around a first axis and a second axis in the housing  1150  by action of the first driving part  1170 . Therefore, the OIS is performed. Here, the first axis A 1  refers to one direction parallel to a reflecting surface of the reflecting member, and the second axis A 2  refers to a direction parallel to the reflecting surface of the reflecting member and perpendicular to the first axis A 1 . 
     The rotation holder  1120  is supported by the sidewall of the housing  1150  in a state in which the rotation frame  1130  is disposed therebetween. In other words, the rotation holder  1120  is supported by one surface of the rotation frame  1130  so that a portion thereof is rotatable around the second axis A 2 , and the rotation frame  1130  is supported by the sidewall of the housing  1150  so that a portion thereof is rotatable around the first axis A 1 . In addition, the rotation holder  1120  is supported by the housing  1150  in a state in which the rotation frame  1130  is disposed therebetween by the attractive force between the magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  provided in the rotation holder  1120  and the pulling yoke  1190  provided in the housing  1150 . 
     The rotation frame  1130  is moved together with the rotation holder  1120  when it is rotated around the first axis A 1 , and is relatively rotated with respect to the rotation frame  1130  (the rotation frame  1130  may not be rotated) when it is rotated around the second axis A 2 . 
     The rotation frame  1130  has a frame structure surrounding an edge of the rotation holder  1120 , and the rotation holder  1120  is partially disposed on an edge of the rotation frame  1130  to be thus rotatable around the second axis A 2  in the rotation frame  1130 . Therefore, a set of ball bearings  1125  aligned in a second axis A 2  direction are provided between the edge of the rotation frame  1130  and the rotation holder  1120 . In addition, facing surfaces of the rotation frame  1130  and the rotation holder  1120  are provided, respectively, with seating grooves  1135   a  and  1125   a  into which the ball bearings  1125  are inserted. The seating grooves  1135   a  and  1125   a  may have a round shape or a poly-pyramidal shape. 
     In addition, the rotation frame  1130  is partially disposed on the housing  1150  and is rotatable around the first axis A 1 . Therefore, a set of ball bearings  1135  aligned in a first axis A 1  direction are provided between the edge of the rotation frame  1130  and the housing  1150 . In addition, facing surfaces of the rotation frame  1130  and the housing  1150  are provided, respectively, with seating grooves  1135   b  and  1155   a  into which the ball bearings  1135  are inserted. The seating grooves  1135   b  and  1155   a  may have a round shape or a poly-pyramidal shape. 
     The first driving part  1170  generates driving force so that the rotation holder  1120  is rotatable around two axes (the first axis A 1  and the second axis A 2 ). Therefore, the rotation holder  1120  may be moved so that an interval between the rotation holder  1120  and a bottom surface of the housing  1150  in each portion is changed. 
     As an example, the first driving part  1170  includes the magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  and the coils  1171   b ,  1173   b ,  1175   b , and  1177   b  disposed to face the magnets  1171   a ,  1173   a ,  1175   a , and  1177   a.    
     When power is applied to the coils  1171   b ,  1173   b ,  1175   b , and  1177   b , the rotation holder  1120  in which the magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  are mounted are rotated around the first axis and the second axis by electromagnetic interaction between the magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  and the coils  1171   b ,  1173   b ,  1175   b , and  1177   b.    
     The magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  may be mounted in the rotation holder  1120 . As an example, the plurality of magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  are mounted on a lower surface of the rotation holder  1120 . In addition, the magnets  1175   a  and  1177   a  aligned in the first axis A 1  direction or the magnets  1171   a  and  1173   a  aligned in the second axis A 2  direction, of the magnets  1171   a ,  1173   a ,  1175   a , and  1177   a  may be separated from each other or be integrated with each other (only an embodiment in which they are separated from each other is illustrated in the drawings). 
     The coils  1171   b ,  1173   b ,  1175   b , and  1177   b  are mounted in the housing  1150 . As an example, the plurality of coils  1171   b ,  1173   b ,  1175   b , and  1177   b  are mounted in the housing  1150  through the board  1160 . That is, the coils  1171   b ,  1173   b ,  1175   b , and  1177   b  are on the board  1160 , and the board  1160  may be mounted in the housing  1150 . In addition, the housing  1150  is provided with the through-hole  1151  so that the coils  1171   b ,  1173   b ,  1175   b , and  1177   b  on the board  1160  attached to an outer surface of the housing  1150  are exposed to the internal space of the housing  1150 . 
     The pulling yoke  1190  is mounted beneath the board  1160 , as described above, and may also serve to reinforce strength of the board  1160 . 
     In an embodiment, when the rotation holder  1120  is rotated, a closed loop control manner of sensing and feeding back a position of the rotation holder  1120  is used. 
     Therefore, position sensors  1171   c  and  1175   c  may be required in order to perform a closed loop control. The position sensors  1171   c  and  1175   c  may be hall sensors. 
     The position sensors  1171   c  and  1175   c  are disposed inside or outside the coils  1171   b  and  1175   b , respectively, and are mounted on the board  1160  on which the coils  1171   b  and  1175   b  are mounted. 
     Meanwhile, the board  1160  may be provided with a gyro sensor (not illustrated) sensing a shake factor such as the hand-shake, or the like, of the user, and may be provided with a driver integrated circuit (IC) (not illustrated) providing driving signals to the coils  1171   b ,  1173   b ,  1175   b , and  1177   b.    
       FIGS. 7A through 7C  are schematic views illustrating a manner in which the rotation holder according to an embodiment is rotated around a first axis, and  FIGS. 8A through 8C  are schematic views illustrating a manner in which the rotation holder according to an embodiment is rotated around a second axis. 
     Referring to  FIGS. 7A through 7C , when the rotation holder  1120  is rotated around the set of the ball bearings  1135  aligned in the first axis A 1  direction, the magnets  1171   a  and  1173   a  and the coils  1171   b  and  1173   b  aligned in the second axis A 2  direction perpendicular to the first axis A 1  may become close to or distant from each other, respectively. That is, the rotation holder  1120  is moved so that an interval between the magnet  1173   a  and the coil  1173   b  on the right (on the drawings) of the first axis A 1  is greater or smaller than that between the magnet  1171   a  and the coil  1171   b  on the left of the first axis A 1 . In addition, when the rotation holder  1120  is rotated around the first axis A 1 , the rotation holder  1120  is rotated together with the rotation frame  1130 . 
     In addition, referring to  FIGS. 8A through 8C , when the rotation holder  1120  is rotated around the set of the ball bearings  1125  aligned in the second axis A 2  direction, the magnets  1175   a  and  1177   a  and the coils  1175   b  and  1177   b  aligned in the first axis A 1  direction perpendicular to the second axis A 2  become close to or distant from each other, respectively. That is, the rotation holder  1120  is moved so that an interval between the magnet  1175   a  and the coil  1175   b  on the left (on the drawings) of the second axis A 2  is greater or smaller than that between the magnet  1177   a  and the coil  1177   b  on the right of the second axis A 2 . In addition, when the rotation holder  1120  is rotated around the second axis A 2 , the rotation frame  1130  is not rotated, and only the rotation holder  1120  is relatively rotated with respect to the rotation frame  1130 . 
       FIG. 9  is a cross-sectional view illustrating the camera module according to an embodiment,  FIG. 10  is an exploded perspective view of the camera module according to an embodiment,  FIG. 11  is an exploded perspective view of a reflecting module of the camera module according to an embodiment, and  FIG. 12  is a bottom view of a rotation frame and a rotation holder of the camera module according to an embodiment. 
     Referring to  FIGS. 9 through 12 , all the components of the camera module  1002  according to an embodiment except for a reflecting module are the same as those of the camera module  1001  described above. Hereinafter, a configuration of the reflecting module will be described in detail below, and the same components will be denoted by the same reference numerals. 
     Basic components of the reflecting module  1100 - 2  according to an embodiment are the same as those of the reflecting module  1100 , and the reflecting module  1100 - 2  according to an embodiment is different from the reflecting module  1100  in that ball bearings, which are bearings for relative rotation between the rotation frame  1130  and the rotation holder  1120  and between the rotation frame  1130  and the housing  1150 , are fixed. 
     That is, in the reflecting module  1100 - 2 , integral ball bearings  1126  are provided integrally with the rotation frame  1130  or the rotation holder  1120  in an edge of either one of the rotation frame  1130  and the rotation holder  1120 , and seating grooves  1136   a  into which the integral ball bearings  1126  are rotatably inserted are provided in the edge of the other one of the rotation frame  1130  and the rotation holder  1120 , in which the integral ball bearings  1126  are not provided. The ball bearings  1126  may be provided in any one of a spherical shape, a hemispherical shape, a semi-cylindrical shape, and a rounded protrusion shape, and cross-sections of the seating grooves  1136   a  may have a round shape or a poly-pyramidal shape. 
     In addition, in the reflecting module  1100 - 2 , integral ball bearings  1156  are provided integrally with the rotation frame  1130  or the housing  1150  in an edge of the rotation frame  1130  or a sidewall of the housing  1150 , and seating grooves  1136   b  into which the integral ball bearings  1156  are rotatably inserted are provided in the edge of the rotation frame  1130  or the sidewall of the housing  1150  in which the integral ball bearings  1156  are not provided. The integral ball bearings  1156  may be provided in any one of a spherical shape, a hemispherical shape, a semi-cylindrical shape, and a rounded protrusion shape, and cross-sections of the seating grooves  1136   b  may have a round shape or a poly-pyramidal shape. 
       FIGS. 13A through 13C  are schematic views illustrating a manner in which the rotation holder according to an embodiment is rotated around a first axis, and  FIGS. 14A through 14C  are schematic views illustrating a manner in which the rotation holder according to an embodiment is rotated around a second axis. 
     Referring to  FIGS. 13A through 13C , when the rotation holder  1120  is rotated around the set of the ball bearings  1156  aligned in the first axis A 1  direction, the magnets  1171   a  and  1173   a  and the coils  1171   b  and  1173   b  aligned in the second axis A 2  direction perpendicular to the first axis A 1  become close to or distant from each other, respectively. That is, the rotation holder  1120  is moved so that an interval between the magnet  1173   a  and the coil  1173   b  on the right (on the drawings) of the first axis A 1  is greater or smaller than that between the magnet  1171   a  and the coil  1171   b  on the left of the first axis A 1 . 
     In addition, referring to  FIGS. 14A through 14C , when the rotation holder  1120  is rotated around the set of the ball bearings  1126  aligned in the second axis A 2  direction, the magnets  1175   a  and  1177   a  and the coils  1175   b  and  1177   b  aligned in the first axis A 1  direction perpendicular to the second axis A 2  become close to or distant from each other, respectively. That is, the rotation holder  1120  is moved so that an interval between the magnet  1175   a  and the coil  1175   b  on the left (on the drawings) of the second axis A 2  is greater or smaller than that between the magnet  1177   a  and the coil  1177   b  on the right of the second axis A 2 . 
       FIG. 15  is a perspective view of a portable electronic device according to an embodiment. 
     Referring to  FIG. 15 , a portable electronic device  2  according to an embodiment may be a portable electronic device such as a mobile communications terminal, a smartphone, a tablet personal computer (PC), or the like, in which a plurality of camera modules  500  and  1000  are mounted. 
     One or more of the camera modules  500  and  1000  is the camera module  1000 :  1001  or  1002  according to the embodiments described with reference to  FIGS. 2 through 14C . 
     That is, a portable electronic device including a dual camera module may include the camera module  1000 :  1001  or  1002  according to the embodiments as at least one of two camera modules. 
     As set forth above, the camera module and the portable electronic device including the same according to the exemplary embodiment of the present disclosure has a simple structure and a reduced size while implementing the auto-focusing function, the zoom function, and the OIS function. In addition, power conduction is significantly 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.