Patent Publication Number: US-2023146039-A1

Title: Camera module

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 17/592,568 filed on Feb. 4, 2022, which is a continuation of U.S. patent application Ser. No. 16/841,975 filed on Apr. 7, 2020, now U.S. Pat. No. 11,277,548 issued on Mar. 15, 2022, which claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2019-0050936 filed on Apr. 30, 2019, and Korean Patent Application No. 10-2019-0085338 filed on Jul. 15, 2019, in the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes. This application and U.S. patent application Ser. No. 17/592,568 are related to U.S. patent application Ser. No. 17/565,646 filed on Dec. 30, 2021, which is a continuation of U.S. patent application Ser. No. 16/841,975, now U.S. Pat. No. 11,277,548. 
    
    
     BACKGROUND 
     1. Field 
     The following description relates to a camera module. 
     2. Description of Background 
     Cameras have generally been installed in portable electronic devices such as tablet personal computers (PCs), laptop computers, and the like, in addition to smartphones, and an autofocusing (AF) function, an optical image stabilization (OIS) function, a zoom function, and the like, have been added to cameras for mobile terminals. 
     For the implementation of various functions, however, structures of camera modules have become complex and sizes of the camera modules have been increased, resulting in portable electronic devices in which camera modules having increased sizes are to be mounted. 
     Additionally, in the case of directly moving a lens or an image sensor for optical image stabilization, both the weight of the lens or the image sensor itself and those of other members having the lens or the image sensor attached thereto need to be taken into consideration. This requires more than a certain level of driving force, thereby increasing power consumption. 
     Further, for the implementation of the AF and zoom functions, a certain distance needs to be secured, such that the lens can move in an optical axis direction. However, it may be difficult to implement such a configuration due to the thinness of the camera module. 
     SUMMARY 
     This Summary is provided to introduce a selection of concepts in 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. 
     A camera module having a simple configuration and a reduced size while implementing functions such as an autofocusing (AF) function, a zoom function, an optical image stabilization (OIS) function, and the like. 
     A camera module, in spite of having a plurality of lens groups, in which the plurality of lens groups may be easily aligned in an optical axis direction. 
     A zoom lens and a reflection module is to be provided with a stopper or a damper so as not to be separated from the optimal position. 
     In order to express performance of a zoom lens to the maximum, it is intended to accurately measure a movement position of the zoom lens by a plurality of position detection sensors, such as Hall sensors. 
     In one general aspect, a camera module includes a housing; a lens module disposed in an internal space of the housing to be movable in an optical axis direction, and including at least one lens therein; a magnet disposed in the lens module; and position detection sensors configured to detect a position of the magnet. One or more of the position detection sensors are disposed to face a first polarity of the magnet and one or more of the position detection sensors are disposed to face a second polarity of the magnet different than the first polarity. 
     The magnet may be a two-pole magnet magnetized to have an N pole, a neutral region, and an S pole, or may be a magnet in which individual magnets having an N pole and an S pole are arranged adjacent to each other. 
     Each of the position detection sensors may be disposed to face only the N pole or the S pole of the magnet. 
     The position detection sensors include a first position detection sensor disposed to face the N pole, a second position detection sensor disposed to face the S pole, and a third position detection sensor disposed to face a region between the N pole and the S pole. 
     The position detection sensors may be spaced apart from each other at equal intervals along the optical axis direction. 
     The camera module may include a coil disposed in the housing and configured to face the magnet, and the position detection sensors may be disposed inside a winding of the coil. 
     The position of the magnet may be calculated based on position values of all sensing values of the position detection sensors. 
     The position values may be all different values within a moving range of the magnet. 
     In another general aspect, a camera module includes a housing; a lens module disposed in an internal space of the housing to be movable in an optical axis direction, including at least one lens therein; a magnet disposed in the lens module and including at least one N pole and at least one S pole that intersect along the optical axis direction; and position detection sensors to detect a position of the magnet. One or more of the position detection sensors are disposed to face a first pole of the magnet and one or more of the position detection sensors are disposed to face a second pole of the magnet. 
     The magnet may be a three-pole magnet magnetized to have at least three polarities, including the at least one N pole and the at least one S pole, or may be a magnet in which at least three individual magnets each having an N pole and an S pole are arranged adjacent to each other. 
     The first pole of the magnet may have a same polarity as the second pole of the magnet, and a number of position detection sensors disposed to face the first pole of the magnet may be the same as a number of position detection sensors disposed to face the second pole of the magnet. 
     The first pole of the magnet may have a same polarity as the second pole of the magnet, the magnet may include a third pole disposed between the first pole and the second pole along the optical axis direction, and the first pole and the second pole may be spaced apart from the third pole by an equal distance along the optical axis direction. 
     The position detection sensors may include at least four positon detection sensors including a first position detection sensor disposed to face a first end of the first pole along the optical axis direction, a second position detection sensor disposed to face a second end of the first pole along the optical axis direction, a third position detection sensor disposed to face a first end of the second pole along the optical axis direction, and a fourth position detection sensor disposed to face a second end of the second pole along the optical axis direction. 
     The position detection sensors may include a fifth position detection sensor disposed between the first position detection sensor and the second position detection sensor along the optical axis direction and a sixth position detection sensor disposed between the third position detection sensor and the fourth position detection sensor along the optical axis direction. 
     The position detection sensors may include a first set of positon detection sensors spaced apart at equal intervals and disposed to face the first pole along the optical axis direction and a second set of position detection sensors spaced apart at equal intervals and disposed to face the second pole along the optical axis direction. 
     The camera module may include a first coil fixed to the housing and disposed in the housing to face the first pole of the magnet and a second coil fixed to the housing and disposed in the housing to face the second pole of the magnet. The first pole of the magnet may have a same polarity as the second pole of the magnet. 
     In another general aspect, a camera module includes a housing; a lens module including at least one lens and configured to move within the housing along an optical axis direction; a magnet disposed in the lens module and including at least two poles that intersect along the optical axis direction; and position detection sensors including at least one position detection sensor disposed to face a first pole of the magnet and at least one position detection sensor disposed to face a second pole of the magnet. 
     The first pole may have a same polarity as the second pole, the magnet may include a third pole having a different polarity than the first pole and the second pole, and the third pole may be disposed between the first pole and the second pole along the optical axis direction. 
     The first pole may have a different polarity than a polarity of the second pole. 
     The position detection sensors may include at least one position detection sensor disposed in a neural region between the first pole and the second pole along the optical axis direction. 
     Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of a portable electronic device according to an example. 
         FIG.  2    is a perspective view of a camera module according to an example. 
         FIGS.  3 A and  3 B  are cross-sectional views of a camera module according to an example. 
         FIG.  4    is an exploded perspective view of a camera module according to an example. 
         FIG.  5    is an exploded perspective view of a housing of a camera module according to an example. 
         FIG.  6 A  is perspective views of a reflection module and a lens module coupled to a housing of a camera module according to an example. 
         FIG.  6 B  is perspective views of a reflection module and a lens module coupled to a housing of a camera module according to another example. 
         FIG.  7    is a perspective view of a board having driving coils and sensors mounted thereon, coupled to a housing of a camera module according to an example. 
         FIG.  8 A  is an exploded perspective view of a rotation plate and a rotation holder in a camera module according to an example. 
         FIG.  8 B  is an exploded perspective view of a rotation plate and a rotation holder in a camera module according to another example. 
         FIG.  9 A  is an exploded perspective view of a housing and a rotation holder in a camera module according to an example. 
         FIG.  9 B  is an exploded perspective view of a housing and a rotation holder in a camera module according to another example. 
         FIG.  10    is an exploded perspective view of a housing and a lens barrel according to an example. 
         FIG.  11    is a perspective view illustrating a damper of a rotation holder and a stopper of a zoom lens, installed according to an example. 
         FIG.  12    is an exploded perspective view in which the damper of the rotation holder and the stopper of the zoom lens in  FIG.  11    are disassembled. 
         FIG.  13 A  is a perspective view illustrating another example of a zoom lens moving guide groove, provided in a housing according to an example. 
         FIG.  13 B  is a reference view illustrating a shape in which the zoom lens of  FIG.  13 A  is installed. 
         FIG.  14    is a reference view illustrating an example of a structure in which a zoom lens according to an example is fixed in a predetermined position. 
         FIGS.  15  and  16    are reference views illustrating another example of a structure in which a zoom lens according to an example is accurately fixed in a predetermined position. 
         FIG.  17 A  is a view illustrating a positional relationship between a magnet and four Hall sensors, provided in a lens barrel according to an example. 
         FIG.  17 B  is a graph illustrating sensing values of four Hall sensors according to movement of a lens barrel in the positional relationship illustrated in  FIG.  17 A . 
         FIGS.  18 A and  19 A  are views illustrating another example having only the modified number of Hall sensors in the positional relationship illustrated in  FIG.  17 A . 
         FIGS.  18 B and  19 B  are graphs illustrating sensing values of a Hall sensor according to movement of a lens barrel in the positional relationship of another example illustrated in  FIGS.  18 A and  19 A . 
         FIG.  20 A  is a view illustrating a positional relationship between a magnet and four Hall sensors provided in a lens barrel according to another example. 
         FIG.  20 B  is a graph illustrating sensing values of four Hall sensors according to movement of a lens barrel in the positional relationship illustrated in  FIG.  20 A . 
         FIG.  21 A  is a view illustrating another example having only the modified number of Hall sensors in the positional relationship illustrated in  FIG.  20 A . 
         FIG.  21 B  is a graph illustrating sensing values of six Hall sensors according to movement of a lens barrel in the positional relationship illustrated in  FIG.  21 A . 
         FIG.  22    is a perspective view of a main board according to an example, and coils and components mounted thereon. 
         FIG.  23    is a perspective view of a portable electronic device according to another example. 
     
    
    
     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. 
       FIG.  1    is a perspective view of a portable electronic device according to an example. 
     Referring to  FIG.  1   , a portable electronic device  1  according to an example may be a portable electronic device such as a mobile communications terminal, a smartphone, a tablet personal computer (PC), and the like, in which a camera module  1000  is mounted. 
     As illustrated in  FIG.  1   , the portable electronic device  1  may be provided with the camera module  1000  to capture an image of a subject. 
     In this example, the camera module  1000  may include a plurality of lenses, and an optical axis (a Z-axis) of the lenses may be disposed 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 . 
     In an example, the optical axis (the Z-axis) of the plurality of the lenses provided in the camera module  1000  may be formed in a width direction or a length direction of the portable electronic device  1 . 
     Therefore, even when the camera module  1000  has the AF, zoom, and OIS functions, and the like, a thickness of the portable electronic device  1  may be made not to increase. Therefore, the portable electronic device  1  may be made thinner. 
     The camera module  1000  according to an example may have the AF, zoom, and OIS functions. 
     The camera module  1000  having the AF, zoom, and OIS functions requires various components, leading to an increased size of the camera module  1000  compared to a conventional camera module. 
     The increased size of the camera module  1000  may give rise to an issue with respect to the miniaturization of the portable electronic device  1  in which the camera module  1000  is mounted. 
     For example, the camera module has an increasing number of stacked lenses for the zoom function. When multiple lenses are stacked in the thickness direction of the portable electronic device, the thickness of the portable electronic device may increase, depending on the number of the stacked lenses. Therefore, a sufficient number of the stacked lenses may not be secured without increasing the thickness of the portable electronic device, thereby deteriorating the zoom function. 
     Further, in order to implement the AF, zoom, and OIS functions, an actuator is required to move a plurality of lens groups in the optical axis direction or a direction perpendicular thereto. When the optical axis (the Z-axis) of the lens groups is formed in the thickness direction of the portable electronic device, the actuator for moving the lens groups should also be installed in the thickness direction. Therefore, the thickness of the portable electronic device may increase. 
     As the optical axis (the Z-axis) of the plurality of lenses is disposed to be perpendicular to the thickness direction of the portable electronic device  1 , the portable electronic device  1  may be made thinner even when the camera module  1000  having the AF, zoom, and OIS functions are mounted. 
       FIG.  2    is a perspective view of a camera module according to an example,  FIGS.  3 A and  3 B  are cross-sectional views of a camera module according to an example, and  FIG.  4    is an exploded perspective view of a camera module according to an example. 
     Referring to  FIGS.  2  through  4   , the camera module  1000  may include a reflection module  1100 , a lens module  1200 , and an image sensor module  1300 , provided in a housing  1010 . 
     The reflection module  1100  may be configured to change a moving direction of light. As an example, a moving direction of light incident through an opening portion  1031  of a cover  1030  covering an upper portion of the camera module  1000  may be changed to a direction toward the lens module  1200  through the reflection module  1100 . To this end, the reflection module  1100  may include a reflective member  1110  configured to reflect the light. 
     For example, a path of light incident through the thickness direction (the Y-axis direction) of the camera module  1000  may be changed by the reflection module  1100  such that the moving direction of the incident light may be approximately identical to the optical axis (the Z-axis) direction. 
     The lens module  1200  may include a plurality of lenses through which the light of which the moving direction is changed by the reflection module  1100  passes. The lens module  1200  may include at least three lens barrels  1210 ,  1220 , and  1230 . The AF and zoom functions may be implemented according to the movements of the at least three lens barrels  1210 ,  1220 , and  1230  in the optical axis (the Z-axis) direction. In addition, in this example, any one lens barrel, such as lens barrel  1230 , of the at least three lens barrels  1210 ,  1220 , and  1230  may be fixed so as not to move in the optical axis direction. The AF and zoom functions may be implemented by the fixed lens barrel  1230 , and the remaining two lens barrels  1210  and  1220 . 
     The image sensor module  1300  may include an image sensor  1310  converting the light which has passed through the plurality of lenses into an electrical signal, and a printed circuit board  1320  on which the image sensor  1310  may be mounted. Further, the image sensor module  1300  may include an optical filter  1340  filtering the incident light which has passed through the lens module  1200 . The optical filter  1340  may be an infrared cut-off filter. 
     In an internal space of the housing  1010 , the reflection module  1100  may be provided in front of the lens module  1200  (along the Z-axis direction), and the image sensor module  1300  may be provided behind the lens module  1200  (along the Z-axis direction). 
     Referring to  FIGS.  2  through  22   , the camera module  1000  may include the reflection module  1100 , the lens module  1200 , and the image sensor module  1300 , which may be provided in the housing  1010 . 
     The reflection module  1100 , the lens module  1200 , and the image sensor module  1300  may be sequentially provided from one side to the other side in the housing  1010 . The housing  1010  may be configured to have an internal space such that all of the reflection module  1100 , the lens module  1200 , and the image sensor module  1300  may be embedded therein (the printed circuit board  1320  included in the image sensor module  1300  may be attached to an outside of the housing  1010 ). 
     For example, as illustrated in the drawings, the housing  1010  may be integrally provided such that the reflection module  1100  and the lens module  1200  may be embedded in the internal space thereof. However, the configuration may not be limited thereto, and for example, separate housings in which the reflection module  1100  and the lens module  1200  are respectively embedded may be connected to each other. 
     The housing  1010  may be covered with the cover  1030  such that the internal space is not shown. 
     The cover  1030  may include the opening portion  1031  such that light is incident therethrough, and the moving direction of the light incident through the opening portion  1031  may be changed by the reflection module  1100 , leading to light incident on the lens module  1200 . The cover  1030  may be integrally provided to cover the entire housing  1010 , or divided into and provided as separate members respectively covering the reflection module  1100  and the lens module  1200 . 
     The reflection module  1100  may include the reflective member  1110 , reflecting light. Further, the light incident on the lens module  1200  may pass through the plurality of lens groups (at least three lens barrels  1210 ,  1220 , and  1230 ), and may be then converted into an electrical signal by the image sensor  1310 , and stored. 
     The housing  1010  may include the reflection module  1100  and the lens module  1200  in the internal space. The reflective module  1100  may be provided at a front side of the internal space of the housing  1010 , and the lens module  1200  may be provided at a rear side thereof. Spaces in which the lens module  1200  may be provided may be distinguished from each other by a protruding wall  1009 . The protruding wall  1009  may be configured to protrude from both side walls of the housing  1010  toward the internal space. 
     In the case of the reflection module  1100  provided on the front side, a rotation holder  1120  may be closely adhered to and supported on an internal wall surface of the housing  1010  by attractive force between a pulling yoke  1153  provided on the internal wall surface of the housing  1010  and a pulling magnet  1151  provided on the rotation holder  1120 . Although not illustrated in the drawings, the housing  1010  may also be provided with a pulling magnet, and the rotation holder  1120  may also be provided with a pulling yoke. Hereinafter, the structure illustrated in the drawings will be described for convenience of explanation. 
     First ball bearings  1131 , a rotation plate  1130 , and second ball bearings  1133  may be provided between the internal wall surface of the housing  1010  and the rotation holder  1120 . 
     As will be described in detail below, since the first ball bearings  1131  and the second ball bearings  1133  may be partially fitted to guide grooves  1132 ,  1134 ,  1021 , and  1121 , thereby closely adhering thereto, a small space may be required between the rotation holder  1120  and the protruding walls  1009  when the rotation holder  1120  and the rotation plate  1130  are fitted to the internal space of the housing  1010 . When the rotation holder  1120  is mounted on the housing  1010 , the rotation holder  1120  may be closely adhered to the internal wall surface of the housing  1010  by the attractive force between the pulling yoke  1153  and the pulling magnet  1151 , thereby allowing for a relatively small space to be formed between the rotation holder  1120  and the third lens barrel  1230 . 
     In this example, a damper  1050 , which may be fitted to an upper portion of the housing  1010  while supporting the rotation holder  1120 , may be included (of course, even without the damper  1050 , the pulling magnet  1151  and the pulling yoke  1153  may be fixed manually). 
     The damper  1050  may include a frame  1051  fitted to the upper portion of the housing  1010 , a locking portion  1055 , and an extension portion  1052  extending downwardly from the frame  1051  (for example, in the Y-axis direction). The extension portion  1052  may include a damping material  1053  to protrude toward the rotation holder  1120  in the optical axis direction. The damping material  1053  may be provided to be fitted into a through-hole provided in the extension portion  1052 , and the damping material  1053  may be any material as long as it is an elastic material such as urethane, silicone, epoxy, a polymer material, or the like. 
     The locking portion  1055  may be locked as fitted to the outside of the housing  1010 . The housing may be provided with an insertion groove  1019  (see  FIG.  5   , for example) into which the frame  1051  and the extension portion  1052  are fitted. The insertion groove  1019  may include a first insertion groove  1019   a  provided along an internal side of an upper edge of the housing  1010 , a second insertion groove  1019   b  extending downwardly perpendicular to the optical axis direction from the other end of the first insertion groove  1019   a , and a third insertion groove  1019   c  (see  FIG.  12   , for example) provided at one end of the first insertion groove  1019   a  along the outside of the housing  1010 . 
     Since the frame  1051  may be fitted into the first insertion groove  1019   a , the locking portion  1055  provided at one end of the frame  1051  may be fitted to the outside of the housing  1010 , and the extension portion  1052  provided at the other side end of the frame  1051  may be fitted into the second insertion groove  1019   b , the frame  1051  may be firmly fixed so as not to move in the optical axis direction. In addition, an adhesive may be applied between the frame  1051  and the housing  1010  to be further bonded to each other. 
     The damping material  1053  may be provided to be fitted in a through-hole provided in the extension portion  1052  (of course, the damping material  1053  may be attached to one side or both sides of the extension portion  1052  by bonding with an adhesive). The damping material  1053  may be provided to protrude to both sides of the extension portion  1052 . The damping material  1053  may serve as a damper for absorbing the shock of the rotation holder  1120  or a stopper for limiting the moving distance, and the third lens barrel  1230  may be fixed ( FIG.  6 B ). In this case, the third lens barrel  1230  may serve to support the one side in the optical axis direction. 
     The damper  1050  may serve as a bracket supporting the rotation holder  1120  when the reflection module  1100  is not driven, and may serve as a damper or a stopper controlling movements of the rotation holder  1120  when the reflection module  1100  is driven. A space may be provided between the damper  1050  and the rotation holder  1120  such that the rotation holder  1120  rotates smoothly. Alternatively, even when the damper  1050  is in contact with the rotation holder  1120 , the damper  1050  may be formed of an elastic material to allow the rotation holder  1120  to move smoothly while being supported by the damper  1050 . 
     The housing  1010  may include a first driving portion  1140  and a second driving portion  1240 , provided to respectively drive the reflection module  1100  and the lens module  1200 . The first driving portion  1140  may include a plurality of coils  1141   b ,  1143   b , and  1145   b  for driving the reflection module  1100 , and the second driving portion  1240  may include a plurality of coils  1241   b ,  1243   b , and  1245   b  for driving the lens module  1200 , where the lens module  1200  may include the first lens barrel  1210 , the second lens barrel  1220 , and the third lens barrel  1230 . 
     Further, since the plurality of coils  1141   b ,  1143   b ,  1145   b ,  1241   b ,  1243   b , and  1245   b  may be provided in the housing  1010  in a state in which they are mounted on a main board  1070 , the housing  1010  may be provided with a plurality of through-holes  1010   a ,  1010   b ,  1010   c ,  1010   d ,  1010   e ,  1010   f  and  1010   g , such that the plurality of coils  1141   b ,  1143   b ,  1145   b ,  1241   b ,  1243   b , and  1245   b  may be exposed to the internal space of the housing  1010 . 
     The main board  1070  on which the coils  1141   b ,  1143   b ,  1145   b ,  1241   b ,  1243   b , and  1245   b  may be mounted may be entirely connected to each other to be provided as a single board, as illustrated in the drawings. In this case, a single terminal may be provided, thereby making it easy to connect an external power supply. The main board  1070  is not limited to such a configuration, and may also be provided as a plurality of boards by separating a board on which coils for the reflection module  1100  are mounted from a board on which coils for the lens module  1200  are mounted. 
     The reflection module  1100  may change a path of light incident through the opening portion  1031 . When a still image or a moving image may be captured, the still image may be blurred or the moving image may be shaken due to hand-shake or other user movement. In this case, the reflection module  1100  may stabilize the hand-shake or other user movement by moving the rotation holder  1120  on which the reflective member  1110  is mounted. For example, when shaking is generated at the time of capturing a still image or a moving image due to a hand-shake or other movement of a user, a relative displacement corresponding to the shaking may be provided to the rotation holder  1120  to compensate for the shaking. 
     The OIS function may be implemented by a movement of the rotation holder  1120  having a relatively low weight, as it does not include lenses or the like, and thus power consumption for the OIS function may be significantly reduced. 
     For example, for the OIS function implementation, the moving direction of the light may be changed by moving the rotation holder  1120  on which the reflective member  1110  is provided without moving a lens barrel including a plurality of lenses or the image sensor such that the light on which the OIS is performed may be incident to the lens module  1200 . 
     The reflection module  1100  may include the rotation holder  1120  provided to be supported by the housing  1010 , the reflective member  1110  mounted on the rotation holder  1120 , and the first driving portion  1140  moving the rotation holder  1120 . 
     The reflective member  1110  may change a moving direction of light. For example, the reflective member  1110  may be a mirror or a prism reflecting the light (for convenience of explanation, the reflective member  1110  may be illustrated, as a prism in the drawings). 
     The reflective member  1110  may be fixed to the rotation holder  1120 . The rotation holder  1120  has a mounting surface  1122  on which the reflective member  1110  is mounted. 
     The mounting surface  1122  of the rotation holder  1120  may be an inclined surface such that a path of light changes. The mounting surface  1122  may be a surface inclined with respect to the optical axis (the Z-axis) of the plurality of the lenses by 30° to 60°. The inclined surface of the rotation holder  1120  may be directed toward the opening portion  1031  of the cover  1030  on which the light is incident. 
     The rotation holder  1120  on which the reflective member  1110  is mounted may be mounted to be movable in the internal space of the housing  1010 . For example, the rotation holder  1120  may be mounted in the housing  1010  to be rotatable around a first axis (the X-axis) and a second axis (the Y-axis). The first axis (the X-axis) and the second axis (the Y-axis) may refer to axes perpendicular to the optical axis (the Z-axis), and may be perpendicular to each other. 
     The rotation holder  1120  may be supported in the housing  1010  by the first ball bearings  1131  aligned along the first axis (the X-axis) and the second ball bearings  1133  aligned along the second axis (the Y-axis) such that the rotation holder  1120  rotates smoothly around the first axis (the X-axis) and the second axis (the Y-axis). As an example, two first ball bearings  1131  aligned along the first axis (the X-axis) and two second ball bearings  1133  aligned along the second axis (the Y-axis) are be illustrated in the drawings. The rotation holder  1120  may rotate around the first axis (the X-axis) and the second axis (the Y-axis) by the first driving portion  1140 , as described below. 
     Further, the first ball bearings  1131  and the second ball bearings  1133  may be provided on a front surface and a rear surface of the rotation plate  1130 , respectively (or alternatively, the first ball bearings  1131  and the second ball bearings  1133  may be provided on a rear surface and a front surface of the rotation plate  1130 , respectively; that is, the first ball bearings  1131  may be aligned along the second axis (the Y-axis) and the second ball bearings  1133  may be aligned along the first axis (the X-axis); the structure illustrated in the drawing will hereinafter be described for convenience of explanation). The rotation plate  1130  may be provided between the rotation holder  1120  and the internal surface of the housing  1010 . 
     The rotation holder  1120  may be supported in the housing  1010  via the rotation plate  1130  by the attractive force between the pulling magnet  1151  or the pulling yoke provided on the rotation holder  1120  and the pulling yoke  1153  or the pulling magnet provided on the housing  1010  (the first ball bearings  1131  and the second ball bearings  1133  may be also provided between the rotation holder  1120  and the housing  1010 ). 
     The guide grooves  1132  and  1134  may be provided on the front surface and the rear surface of the rotation plate  1130  such that the first ball bearings  1131  and the second ball bearings  1133  are inserted, respectively. The guide grooves  1132  and  1134  may include first guide grooves  1132  into which the first ball bearings  1131  are partially inserted, and second guide grooves  1134  into which the second ball bearings  1133  are partially inserted. 
     The housing  1010  may be provided with third guide grooves  1021  into which the first ball bearings  1131  are partially inserted, and the rotation holder  1120  may be provided with fourth guide grooves  1121  into which the second ball bearings  1133  are partially inserted. 
     The first guide grooves  1132 , the second guide grooves  1134 , the third guide grooves  1021 , and the fourth guide grooves  1121  described above may be provided in a hemispherical or polygonal (polyprismatic or polypyramidal) groove shape such that the first ball bearings  1131  and the second ball bearings  1133  may easily rotate therein. 
     The first ball bearings  1131  and the second ball bearings  1133  may serve as bearings while rolling or sliding in the first guide grooves  1132 , the second guide grooves  1134 , the third guide grooves  1021 , and the fourth guide grooves  1121 . 
     As illustrated in  FIGS.  8 B and  9 B , the first ball bearings  1131   a  and the second ball bearings  1133   a  may be fixed to both surfaces of the rotation plate  1130 , respectively. 
     The configuration is not limited thereto, and the first ball bearings  1131   a  and the second ball bearings  1133   a  may have a structure in which they may be fixedly provided in at least one of the housing  1010 , the rotation plate  1130 , and the rotation holder  1120 . For example, the first ball bearings  1131   a  may be fixedly provided in the housing  1010  or on the rotation plate  1130 , and the second ball bearings  1133   a  may be fixedly provided on the rotation plate  1130  or the rotation holder  1120 . In this case, only a member facing a member in which the first ball bearings  1131   a  or the second ball bearings  1133   b  are fixedly provided may be provided with the guide grooves, and the ball bearings may serve as friction bearings by sliding rather than rotating. 
     Further, the first ball bearings  1131  and the second ball bearings  1133  may be separately manufactured and then attached to any one of the housing  1010 , the rotation plate  1130  and the rotation holder  1120 . Alternatively, the first ball bearings  1131  and the second ball bearings  1133  may be provided integrally with the housing  1010 , the rotation plate  1130 , or the rotation holder  1120  at the time of manufacturing the housing  1010 , the rotation plate  1130 , or the rotation holder  1120 . 
     The first driving portion  1140  generates driving force such that the rotation holder  1120  may be rotatable around the two axes. 
     As an example, the first driving portion  1140  may include a plurality of magnets  1141   a ,  1143   a , and  1145   a , and the plurality of coils  1141   b ,  1143   b , and  1145   b  arranged to face the plurality of magnets  1141   a ,  1143   a , and  1145   a , respectively. 
     When power is applied to the plurality of coils  1141   b ,  1143   b , and  1145   b , the rotation holder  1120  on which the magnets  1141   a ,  1143   a , and  1145   a  may be mounted may be rotated around the first axis (the X-axis) and the second axis (the Y-axis) by an electromagnetic effect between the plurality of magnets  1141   a ,  1143   a , and  1145   a , and the plurality of coils  1141   b ,  1143   b , and  1145   b.    
     The plurality of magnets  1141   a ,  1143   a , and  1145   a  may be mounted on the rotation holder  1120 . As an example, the magnet  1141   a  may be mounted on a lower surface of the rotation holder  1120 , and the remaining magnets  1143   a  and  1145   a  may be mounted on side surfaces of the rotation holder  1120 . 
     The plurality of coils  1141   b ,  1143   b , and  1145   b  may be mounted on the housing  1010 . As an example, the plurality of coils  1141   b ,  1143   b , and  1145   b  may be mounted on the housing  1010  through the main board  1070 . The plurality of coils  1141   b ,  1143   b , and  1145   b  may be provided on the main board  1070 , while the main board  1070  may be mounted on the housing  1010 . 
     In the drawings, an example in which the main board  1070  may be integrally provided such that both the coils for the reflection module  1100  and those for the lens module  1200  may be mounted thereon is illustrated. The main board  1070  may be provided as at least two separate boards on which the coils for the reflection module  1100  and the coils for the lens module  1200  may be mounted, respectively. 
     A closed loop control method involving sensing a position of the rotation holder  1120  and providing feedback may be used when rotating the rotation holder  1120 . 
     Therefore, position detection sensors  1141   c  and  1143   c  may be required for the closed loop control. The position detection sensors  1141   c  and  1143   c  may be Hall sensors. 
     The position detection sensors  1141   c  and  1143   c  may be disposed inside or outside of the coils  1141   b  and  1143   b , respectively, and may be mounted on the main board  1070  on which each of the coils  1141   b  and  1143   b  is mounted. 
     The main board  1070  may be provided with a gyro sensor (not illustrated) sensing a shaking factor such as a hand-shake or other user movement, and may be provided with a driver integrated circuit (IC; not illustrated) providing a driving signal to the plurality of coils  1141   b ,  1143   b , and  1145   b.    
     When the rotation holder  1120  rotates around the first axis (the X-axis), the rotation plate  1130  may rotate around the first ball bearings  1131  arranged along the first axis (the X-axis), which makes the rotation holder  1120  rotate as well (in this case, the rotation holder  1120  may not move relative to the rotation plate  1130 ). 
     Further, when the rotation holder  1120  rotates around the second axis (the Y-axis), the rotation holder  1120  rotates around the second ball bearings  1133  arranged along the second axis (the Y-axis) (in this case, the rotation plate  1130  may not rotate, and the rotation holder  1120  may thus move relative to the rotation plate  1130 ). 
     For example, when the rotation holder  1120  rotates around the first axis (the X-axis), the first ball bearings  1131  may operate, and when the rotation holder  1120  rotates around the second axis (the Y-axis), the second ball bearings  1133  may operate. This is because, as illustrated in the drawings, the second ball bearings  1133  aligned along the second axis (the Y-axis) cannot move while being fitted into the guide grooves  1134  and  1121  when the rotation holder  1120  rotates around the first axis (the X-axis), and the first ball bearings  1131  aligned along the first axis (the X-axis) cannot move while being fitted into the guide grooves  1021  and  1132  when the rotation holder  1120  rotates around the second axis (the Y-axis). 
     The light which has reflected on the reflection module  1100  may be incident on the lens module  1200 . The incident light may be implemented by the AF or zoom function by moving the optical axis direction (Z-axis) of at least three lens barrels  1210 ,  1220 , and  1230  provided in the lens module  1200 . 
     Referring to  FIG.  6 A , the two lens barrels  1210  and  1220  at the rear may be responsible for the zoom function, and the lens barrel  1230  at the front may be responsible for the AF function. Further, the three lens barrels  1210 ,  1220 , and  1230  may be responsible for the zoom and AF functions in various combinations. 
     Various deformations may be additionally controlled. Referring to  FIG.  6 B , for example, the rear two lens barrels  1210  and  1220 , individually or in common, perform the zoom or AF function, where, for example, the two lens barrels  1210  and  1220  combine to perform the zoom function, and the lens barrel  1210  at the rearmost may be further responsible for the AF function, and the front lens barrel  1230  may remain fixed to the housing  1010 . Further, although not illustrated in the drawings, any one of the three lens barrels  1210 ,  1220 , and  1230  may remain fixed to the housing  1010  while the remaining two lens barrels may be responsible for the zoom or AF function, individually or in common. In this case, the lens barrel (for example, lens barrel  1230 ) fixed to the housing  1010  does not require ball bearings or the like interposed between a driving magnet or a coil facing thereto and the housing  1010 . 
     The housing may be configured to include a space in which the one front lens barrel  1230  and two rear lens barrels  1210  and  1220  may be partitioned by the protruding wall  1009 , but may be not limited to such a configuration. The three lens barrels  1210 ,  1220 , and  1230  may be provided in a same space or partitioned in separate spaces. 
     The plurality of stacked lens groups provided in the lens module  1200  may be divided into at least three lens barrels  1210 ,  1220 , and  1230 , respectively. Even when the plurality of stacked lens groups is divided and provided in at least three lens barrels  1210 ,  1220 , and  1230 , the optical axis may be aligned in the Z-axis direction, a direction in which light may be emitted from the reflection module  1100 . 
     The lens module  1200  may include the second driving portion  1240  to implement the AF and zoom functions. 
     The lens module  1220  may include at least three lens barrels, the first lens barrel  1210 , the second lens barrel  1220 , and the third lens barrel  1230 , in the internal space of the housing  1010 , and may include the second driving portion  1240  moving the three lens barrels  1210 ,  1220 , and  1230  in the optical axis (the Z-axis) direction with respect to the housing  1010 . 
     The first to third lens barrels  1210 ,  1220 , and  1230  may be configured to move approximately in the optical axis (the Z-axis) direction for the AF or zoom function. 
     In this regard, the second driving portion  1240  generates driving force to move the first to third lens barrels  1210 ,  1220 , and  1230  in the optical axis (the Z-axis) direction. For example, the second driving portion  1240  enables the implementation of the AF or zoom function by moving the first to third lens barrels  1210 ,  1220 , and  1230  individually in the optical axis (the Z-axis) direction. 
     The first to third lens barrels  1210 ,  1220 , and  1230  may be configured to be supported on a bottom surface of the housing  1010 . For example, the first to third lens barrels  1210 ,  1220 , and  1230  may be individually supported by ball bearings on the bottom surface of the housing  1010 . Hereinafter, an example in which the first to third lens barrels  1210 ,  1220 , and  1230  may be individually supported by ball bearings on the bottom surface of the housing  1010  will be mainly described. 
     As an example, the second driving portion  1240  may include a plurality of magnets  1241   a ,  1243   a , and  1245   a , and the plurality of coils  1241   b ,  1243   b , and  1245   b  disposed to face the magnets  1241   a ,  1243   a , and  1245   a , respectively. 
     When power is applied to the coils  1241   b ,  1243   b , and  1245   b , the first to third lens barrels  1210 ,  1220 , and  1230  on which the magnets  1241   a ,  1243   a , and  1245   a  may be separately mounted may be moved in the optical axis (the Z-axis) direction by an electromagnetic effect between the magnets  1241   a ,  1243   a , and  1245   a  and the coils  1241   b ,  1243   b , and  1245   b.    
     The plurality of magnets  1241   a ,  1243   a , and  1245   a  may be separately mounted on the first to third lens barrels  1210 ,  1220 , and  1230 . As an example, the first magnet  1241   a  may be mounted on a side surface of the first lens barrel  1210 , and the second magnet  1243   a  may be mounted on a side surface of the second lens barrel  1220 , while the third magnet  1245   a  may be mounted on a side surface of the third lens barrel  1230 . 
     The plurality of coils  1241   b ,  1243   b , and  1245   b  may be mounted on the housing  1010  to face the plurality of magnets  1241   a ,  1243   a , and  1245   a , respectively. As the plurality of magnets  1241   a ,  1243   a , and  1245   a  may be provided on both side surfaces of the first to third lens barrels  1210 ,  1220 , and  1230 , and the plurality of coils  1241   b ,  1243   b , and  1245   b  may be provided on both side walls to face each other. 
     As an example, the main board  1070  may be mounted on the housing  1010 , while having the plurality of coils  1241   b ,  1243   b , and  1245   b  mounted thereon. 
     A closed loop control method involving sensing positions of the first to third lens barrels  1210 ,  1220 , and  1230  and providing feedback may be used when moving the first to third lens barrels  1210 ,  1220 , and  1230 . Therefore, position detection sensors  1241   c ,  1243   c , and  1245   c  may be required for the closed loop control. The position detection sensors  1241   c ,  1243   c , and  1245   c  may be Hall sensors. 
     The position detection sensors  1241   c ,  1243   c , and  1245   c  may be disposed inside or outside of the coils  1241   b ,  1243   b , and  1245   b , respectively, and may be mounted on the main board  1070  on which each of the coils  1241   b ,  1243   b , and  1245   b  may be mounted. 
     In the drawings, the first lens barrel  1210  and the second lens barrel  1220  may be driven by a pair of coils and magnets. In this case, coils and magnets may be provided on any one side. The coils and the magnets may have somewhat increased sizes to enhance the driving force. In such case, a plurality of position detection sensors  1241   c  and  1243   c  may be provided for accurate position sensing. In the drawings, four position detection sensors  1241   c  and  1243   c  may be provided inside each of the coils  1241   b  and  1243   b  driving the first lens barrel  1210  and the second lens barrel  1220 . This is because the first lens barrel  1210  and the second lens barrel  1220  may be moved a considerable distance in the optical axis direction to implement a zoom, such that a sufficient number of Hall sensors to sense the correct position should be provided. 
     The first lens barrel  1210  may be provided in the housing  1010  to be movable in the optical axis (the Z-axis) direction. As an example, a plurality of third ball bearings  1215  may be disposed between the first lens barrel  1210  and the bottom surface of the housing  1010 . 
     The plurality of third ball bearings  1215  serve as bearings guiding movements of the first lens barrel  1210  in a process of implementing the AF and zoom functions. 
     The plurality of third ball bearings  1215  may be configured to roll in the optical axis (the Z-axis) direction when driving force moving the first lens barrel  1210  in the optical axis (the Z-axis) direction is generated. Therefore, the plurality of third ball bearings  1215  guide the movement of the first lens barrel  1210  in the optical axis (the Z-axis) direction. 
     A plurality of guide grooves  1214  and  1013 ,  1014  accommodating the third ball bearings  1215  therein may be formed on a facing bottom surface of the first lens barrel  1210  and on the bottom surface of the housing  1010  facing the first lens barrel  1210 , and some of the guide grooves may be elongated in the optical axis (the Z-axis) direction. 
     The plurality of third ball bearings  1215  may be accommodated in the guide grooves  1214  and  1013 ,  1014 , and may be inserted to fit between the first lens barrel  1210  and the housing  1010 . 
     Some or all of the guide grooves  1214  and  1013 ,  1014  may be elongated in the optical axis (the Z-axis) direction. Further, cross sections of the guide grooves  1214  and  1013 ,  1014  may have various shapes, such as a rounded shape and a polygonal shape. 
     In this case, the first lens barrel  1210  may be pressed toward the bottom of the housing  1010  such that the plurality of third ball bearings  1215  may remain in contact with the first lens barrel  1210  and the housing  1010 . To this end, a pulling yoke  1016  (for example, see  FIG.  10   ) may be mounted on the bottom surface of the housing  1010  to face a pulling magnet  1216  (for example, see  FIG.  10   ) mounted on the lower surface of the first lens barrel  1210 . The pulling yoke  1016  may be formed of a magnetic material. A pulling magnet may be mounted on the bottom surface of the housing  1010 , and a pulling yoke may be mounted on a lower surface of the first lens barrel  1210 . 
     The coil  1241   b  driving the first lens barrel  1210  may be provided on one side surface of the housing  1010 . In this case, the electromagnetic force acts on one side surface of the first lens barrel  1210 , and thus the pulling magnet  1216  and the pulling yoke  1016  may be biased toward one side surface from a center of the housing  1010  in order to facilitate driving of the first lens barrel  1210 . The first lens barrel  1210  may include a main body portion  1210   a  and a magnet-mounting portion  1210   b  extending to a side surface of the second lens barrel  1220  in the optical axis direction in order to increase a side of the magnet  1241   a  to enhance driving force. Further, in order to increase a side of the magnet  1243   a  for enhanced driving force, the second lens barrel  1220  may include a main body portion  1220   a  and a magnet-mounting portion  1220   b  extending to a side surface of the first lens barrel  1210  in the optical axis direction. 
     The coil  1243   b  driving the second lens barrel  1220  may be provided on the other side surface, which may be an opposite side surface of the one side surface of the housing  1010  on which the coil  1241   b  may be provided. In this case, as electromagnetic force may be applied to the other side surface of the second lens barrel  1220 , a pulling magnet  1226  and a pulling yoke  1017  (for example, see  FIG.  10   ) may be biased toward the other side surface from the center of the housing  1010  in order to facilitate driving of the second lens barrel  1220 . 
     Further, the coil  1245   b  driving the third lens barrel  1230  may be provided on both side surfaces or one side surface of the housing  1010 . When the coil  1245   b  is provided on only one side of the housing  1010 , a pulling magnet  1236  and a pulling yoke  1018  (for example, see  FIG.  10   ) may be biased toward one side surface from the center of the housing  1010  in order to facilitate the driving of the third lens barrel  1230 , similarly to the first and second lens barrels  1210  and  1220 . However, this refers to a case in which the coils driving the lens barrels  1210 ,  1220 , and  1230  may only be provided on one side surface of the one side surface and the other side surface. When the coils are provided on both side surfaces, a pulling magnet and a pulling yoke may be provided approximately at the center of the housing  1010 . 
     The second lens barrel  1220  may be disposed in the housing  1010  to be movable in the optical axis (the Z-axis) direction. As an example, the second lens barrel  1220  may be disposed in parallel with the first lens barrel  1210  in the optical axis direction in front of the first lens barrel  1210 . 
     A plurality of fourth ball bearings  1225  may be disposed between the second lens barrel  1220  and the bottom surface of the housing  1010 , and the second lens barrel  1220  may be slid or rolled with respect to the housing  1010  by the fourth ball bearings  1225 . 
     The plurality of fourth ball bearings  1225  may be configured to assist in a rolling or sliding motion of the second lens barrel  1220  in the optical axis direction (the Z-axis direction) when driving force may be generated such that the second lens barrel  1220  moves in the optical axis (the Z-axis) direction. 
     A plurality of guide grooves  1224  and  1013 ,  1014  accommodating the fourth ball bearings  1225  therein may be formed on a facing bottom surface of the second lens barrel  1220  and the housing  1010 , and some of the guide grooves may be elongated in the optical axis (the Z-axis) direction. 
     The plurality of fourth ball bearings  1225  may be accommodated in the guide grooves  1224  and  1013 ,  1014  and may be inserted to fit between the second lens barrel  1220  and the housing  1010 . 
     Each of the plurality of guide grooves  1224  and  1013 ,  1014  may be elongated in the optical axis (the Z-axis) direction. Further, cross sections of the guide grooves  1224  and  1013 ,  1014  may be in various shapes such as a rounded shape, a polygonal shape, or the like. 
     The second lens barrel  1220  may be pressed toward the bottom surface of the housing  1010  such that the fourth ball bearings  1225  may remain in contact with the second lens barrel  1220  and the housing  1010 . 
     To this end, the pulling yoke  1017  may be mounted on the bottom surface of the housing  1010  to face the pulling magnet  1226  mounted on the second lens barrel  1220 . The pulling yoke  1017  may be a magnetic material. A pulling magnet may be mounted on a bottom surface of the housing  1010 , and a pulling yoke may be mounted on a lower surface of the second lens barrel  1220 . 
     The third lens barrel  1230  may be disposed in the housing  1010  to be movable in the optical axis (the Z-axis) direction. As an example, the third lens barrel  1230  may be disposed in parallel with the second lens barrel  1220  in the optical axis direction in front of the second lens barrel  1220 . 
     A plurality of fifth ball bearings  1235  may be disposed between the third lens barrel  1230  and the bottom surface of the housing  1010 , and the third lens barrel  1230  may be slid or rolled with respect to the housing  1010  by the fifth ball bearings  1235 . 
     The plurality of fifth ball bearings  1235  may be configured to assist in a rolling or sliding motion of the third lens barrel  1230  in the optical axis direction (the Z-axis direction) when driving force is generated, such that the third lens barrel  1230  moves in the optical axis (the Z-axis) direction. 
     A plurality of guide grooves  1234  and  1015  accommodating the fifth ball bearings  1235  therein may be formed on a facing bottom surface of the third lens barrel  1230  and the housing  1010 , and some of the guide grooves  1234  and  1015  may be elongated in the optical axis (the Z-axis) direction. 
     The plurality of fifth ball bearings  1235  may be accommodated in the guide grooves  1234  and  1015 , and may be inserted to fit between the third lens barrel  1230  and the housing  1010 . 
     Each of the plurality of guide grooves  1234  and  1015  may be elongated in the optical axis (the Z-axis) direction. Further, cross sections of the guide grooves  1234  and  1015  may have various shapes such as a rounded shape, a polygonal shape, or the like. 
     In this case, the third lens barrel  1230  may be pressed toward the bottom surface of the housing  1010  such that the fifth ball bearings  1235  may remain in contact with the third lens barrel  1230  and the housing  1010 . 
     To this end, the pulling yoke  1018  may be mounted on the bottom surface of the housing  1010  to face the pulling magnet  1236  mounted on the third lens barrel  1230 . The pulling yoke  1018  may be a magnetic material. A pulling magnet may be mounted on a bottom surface of the housing  1010 , and a pulling yoke may be mounted on a lower surface of the third lens barrel  1230 . 
     Guide grooves  1013 ,  1014 , and  1015  provided in the housing  1010  to guide the movements of the third to fifth ball bearings  1215 ,  1225 , and  1235  each may have a long groove shape extending in the optical axis direction, or be a guide groove in which at least two of the guide grooves may be mutually connected to each other. In the case of the guide groove in which at least two of the guide grooves  1013 ,  1014 , and  1015  may be interconnected, the first to third lens barrels  1210 ,  1220 , and  1230  may be easily aligned in the optical axis direction. 
     An example in which the guide groves  1013  and  1014  provided in moving paths of the first and second lens barrels  1210  and  1220  may be provided as a single guide groove in which they may be connected to each other and the third lens barrel  1230  may be separately provided, may be illustrated. Although not limited thereto, the guide grooves may be provided in the form in which only the guide grooves  1014  and  1015  used for the movements of the second and third lens barrels  1220  and  1230  may be connected to each other or in which all the guide grooves  1013 ,  1014 , and  1015  may be connected. 
     At least some of the guide grooves  1214 ,  1224 , and  1234  of the first to third lens barrels  1210 ,  1220 , and  1230  may protrude toward the bottom of the housing  1010  on both sides of the optical axis, and thus, may be provided with anti-separation protrusions  1213 ,  1223 , and  1233  to prevent separation of the ball bearings  1215 ,  1225 , and  1235 . The anti-separation protrusions  1213 ,  1223 , and  1233  may be provided corresponding to the shape of the guide grooves  1013 ,  1014 , and  1015  provided in the housing  1010 . When the first to third lens barrels  1210 ,  1220 , and  1230  move in the optical axis direction, the anti-separation protrusions  1213 ,  1223 , and  1233  may be provided to have a space not to contact the bottom of the guide grooves  1013 ,  1014 , and  1015 . 
     The anti-separation protrusions are not limited to those provided in the first to third lens barrels  1210 ,  1220 , and  1230 , and may be provided in the housing  1010  on the same principle. 
     Further, referring to  FIG.  13 A , the housing  1010  according to another example of the present disclosure may be moved by guide grooves  1013   a ,  1013   b ,  1014   a , and  1014   b  in which the first and second lens barrels  1210  and  1220  are respectively different. For example, the housing  1010  may include a total of four first guide grooves  1013   a  and  1013   b  and second guide grooves  1014   a  and  1014   b  respectively provided separately, and the first lens barrel  1210  may be supported by the third ball bearing  1215  fitted to the first guide grooves  1013   a  and  1013   b , and the second lens barrel  1220  may be supported by the fourth ball bearing  1225  fitted to the second guide grooves  1014   a  and  1014   b.    
     In this case, since the first lens barrel  1210  and the second lens barrel  1220  may be somewhat staggered in a direction perpendicular to the optical axis direction, each of extension portions  1219  and  1229  may sufficiently move in the optical axis direction without interference. Therefore, the zoom performance may be further improved. 
     The first to third lens barrels  1210 ,  1220 , and  1230  according to this example may be sequentially provided in the optical axis direction, and the first and second lens barrels  1210  and  1220  may be respectively provided with coils  1241   b  and  1243   b  and magnets  1241   a  and  1243   a . In addition, as illustrated, the third lens barrel  1230  may be provided with a coil  1245   b  and a magnet  1245   a  on one side thereof. The magnets  1241   a ,  1243   a , and  1245   a  provided in the first to third lens barrels  1210 ,  1220 , and  1230  may be alternately arranged in one side and the other side in a zigzag manner, to minimize the mutual electromagnetic effects. 
     Since the first and second lens barrels  1210  and  1220  according to this example may be moved in the optical axis direction for realizing zoom or auto focus in one space partitioned by the protruding wall(s)  1009 , they may be in contact with each other. In this case, it is not possible to accurately control the optical axis direction position due to a broken or excessive stroke. 
     Therefore, in this example, the stopper  1060  may be provided to control the movement of the first and second lens barrels  1210  and  1220 , respectively. The stopper  1060  may include a first stopper  1061  limiting a moving distance of the first lens barrel  1210 , and a second stopper  1062  limiting a moving distance of the second lens barrel  1220 . The first stopper  1061  and the second stopper  1062  may be provided separately, or may be interconnected structures. 
     The stopper  1060  may include the first stopper  1061  and the second stopper  1062 . A first frame  1061   a  and a second frame  1062   a  to be described below may be integrally connected, or may be separately provided. The first frame  1061   a  and the second frame  1062   a  may have damping materials  1061   d  and  1062   d  in portions facing the first and second lens barrels  1210  and  1220 , to absorb impact of the first and second lens barrels  1210  and  1220  moving upwardly. 
     The first stopper  1061  may include the first frame  1061   a , a first extension portion  1061   b  extending from the first frame  1061   a  in a direction perpendicular to the optical axis direction, and a first damping material  1061   c  provided in first extension portion  1061   b . The first damping material  1061   c  may be fitted to a hole, provided in the first extension portion  1061   b , to protrude from both sides of the first extension portion  1061   b , or may be fixed on both sides of the first extension portion  1061   b  by bonding using an adhesive. The first frame  1061   a  may be mounted on the side wall and the wall on the other end of the housing  1010  to cover the upper portion of the first lens barrel  1210  in which the extension portion  1219  is provided. The first extension portion  1061   b  and the first damping material  1061   c  may be fitted between one side of the second lens barrel  1220  and the protruding wall  1009 . For example, the housing may be provided with an insertion groove  1011  into which the first frame  1061   a  and the first extension portion  1061   b  are fitted. The insertion groove  1011  may include a first insertion groove  1011   a  provided along the internal side of the upper edge of the housing  1010 , and a second insertion groove  1011   b  extending downwardly perpendicular to the optical axis direction from one end of the first insertion groove  1011   a . The first frame  1061   a  may be mounted on the first insertion groove  1011   a , and the first extension portion  1061   b  may be fitted to the second insertion groove  1011   b . Of course, the first frame  1061   a  may be further fixed to the housing  1010  by bonding with an adhesive. 
     Since the first extension portion  1061   b  and the first damping material  1061   c  extend from an upper portion of the extension portion  1229  of the second lens barrel  1220  to the lower portion, a second space portion  1221 , which may be a space secured to allow the first extension portion  1061   b  and the first damping material  1061   c  to extend, may be provided in the upper portion of the extension portion  1229  of the second lens barrel  1220  for securing space. 
     Therefore, the first lens barrel  1210  may be controlled to only move between the other end of the housing  1010  and the first damping material  1061   c  fitted to a front portion of the protruding wall  1009 . 
     The second stopper  1062  may include a second frame  1062   a , a second extension portion  1062   b  extending from the second frame  1062   a  in a direction perpendicular to the optical axis direction, and a second damping material  1062   c  provided in the second extension portion  1062   b . The second damping material  1062   c  may be fitted into a hole provided in the second extension portion  1062   b  to protrude from both sides of the second extension portion  1062   b , or may be fixed on both sides of the second extension portion  1062   b  by bonding using an adhesive. The second frame  1062   a  may be mounted on the upper portion of the housing  1010  and the protruding wall  1009  to cover an upper portion of one side in which the extension portion  1229  is provided in the second lens barrel  1220 . The second extension portion  1062   b  and the second damping material  1062   c  may be fitted between the other side of the first lens barrel  1210  and the other internal wall of the housing  1010 . For example, the housing may be provided with an insertion groove  1012  into which the second frame  1062   a  and the second extension portion  1062   b  are fitted. The insertion groove  1012  may include a first insertion groove  1012   a  provided along the internal side of the upper edge of the housing  1010 , and a second insertion groove  1012   b  extending downwardly from one end of the first insertion groove  1012   a  in a direction perpendicular to the optical axis direction. The second frame  1062   a  may be mounted on the first insertion groove  1012   a , and the second extension portion  1062   b  may be fitted to the second insertion groove  1012   b . Of course, the second frame  1062   a  may be further fixed to the housing  1010  by bonding with an adhesive. 
     Since the second extension portion  1062   b  and the second damping material  1062   c  extend downwardly from the upper portion of the extension portion  1219  of the first lens barrel  1210 , a first space portion  1211 , which may be a space secured to allow the second extension portion  1062   b  and the second damping material  1062   c  to extend, may be provided in the upper portion of the extension portion  1219  of the first lens barrel  1210  for securing space. 
     Therefore, the second lens barrel  1220  may be controlled to only move between the protruding wall  1009  and the second damping material  1062   c  fitted to the front of the other end of the housing  1010 . 
     Referring to  FIG.  14   , a mechanism for guiding a position in which a third lens barrel  1230  is fixed to a housing  1010  is illustrated. 
     For example, the housing  1010  of the camera module  1000  may be provided with the damper  1050  for damping the rotation holder  1100 , and the damping material  1053  may be provided in the extension portion  1052  of the damper  1050  to protrude in both directions of the optical axis. The protruding wall  1009  that protrudes into an internal space and partitions a space in which the first and second lens barrels  1210  and  1220  are provided and a space in which the third lens barrel  1230  is provided may be included. 
     Thus, the third lens barrel  1230  may be fitted to the housing  1010  such that the protrusion wall  1009  is used as an assembly reference surface and one side is supported by the damping material  1053 . Since the damping material  1053  has elastic force, the third lens barrel  1230  may be fitted between the damping material  1053  and the protruding wall  1009  in a somewhat indented manner. Alternatively, the third lens barrel  1230  may be fitted to the housing  1010  first, and then the damping material  1053  of the damper  1050  may be inserted to press the third lens barrel  1230 . An adhesive may be injected between the third lens barrel  1230  and side wall or bottom of the housing  1010  such that they are bonded to each other. 
     Referring to  FIGS.  15  and  16   , another example of a mechanism in which one of zoom lenses according to an example is accurately fixed in a predetermined position is illustrated. 
     In this example, since the third lens barrel  1230  is fixed to the housing  1010 , a bearing required to move the third lens barrel  1230  may be unnecessary in principle. This example discloses a mechanism in which the third lens barrel  1230  is accurately disposed in a predetermined position in the housing  1010  using a ball member. After the third lens barrel  1230  is disposed in the housing  1010 , an adhesive may be injected between the third lens barrel  1230  and side wall or bottom of the housing  1010  such that they may be bonded to each other. 
     First, referring to  FIG.  15   , the third lens barrel  1230  may be mounted with at least three ball members  1235  between a bottom of the housing  1010 . Guide grooves  1234  and  1015  into which the ball members are inserted may be provided in portions in which the third lens barrel  1230  and the housing  1010  face each other, and these guide grooves may be provided individually for each ball member. 
     A pair of guide grooves  1234  and  1015  provided in the third lens barrel  1230  and the housing  1010  into which the ball members  1235  are respectively inserted may be provided with the same shape as each other (the ball member may be in contact with the third lens barrel  1230  and the guide grooves of the housing  1010  at a point), the three guide grooves provided in the third lens barrel  1230  or the housing  1010 , respectively, may be provided as the shape illustrated in the enlarged view of  FIG.  15    ({circle around ( 1 )}, {circle around ( 2 )}, and {circle around ( 3 )}). First, {circle around ( 1 )} may be a guide groove formed by cutting all corners in the shape of a triangular pyramid, may allow the ball members  1235  to only contact three surfaces of which a dot is drawn, and may constrain the third lens barrel  1230  in the optical axis (the Z-axis) direction, the X-axis direction perpendicular to the optical axis direction, and the Y-axis direction perpendicular to the optical axis and the X axis directions, {circle around ( 2 )} may be a guide groove viewed as having a ‘V’ shaped groove (in this case, a bottom thereof may be cut), elongated in the optical axis direction, may allow the ball members  1235  to only contact two surfaces of which a dot is drawn, and may constrain the third lens barrel  1230  in the X-axis and Y-axis directions, and {circle around ( 3 )} may be a guide groove having a long and flat bottom in the optical axis direction, may allow the ball members  1235  to only contact one surface of which a dot is drawn, and may constrain the third lens barrel  1230  in the Y-axis direction. As a result, since the X, Y, and Z axis directions of the third lens barrel  1230  may be constrained by the conditions of {circle around ( 1 )}, {circle around ( 2 )}, and {circle around ( 3 )}, the third lens barrel  1230  may be accurately positioned by simply placing the ball members  1235  for inserting the third lens barrel  1230  into the guide grooves  1234  and  1015  into the housing  1010 . 
     Next, referring to  FIG.  16   , the third lens barrel  1230  may be mounted with at least three ball members  1235  between a bottom of the housing  1010 . Guide grooves  1234  and  1015  into which the ball members are inserted may be provided at portions in which the third lens barrel  1230  and the housing  1010  face each other, and these guide grooves  1234  and  1015  may be provided individually for each ball member. 
     A pair of guide grooves  1234  and  1015  provided in the third lens barrel  1230  and the housing  1010  into which the ball members  1235  are respectively inserted may be provided differently from each other, and the other two may be provided in the same shape with each other. For example, in the following three, {circle around ( 1 )} may be a guide groove having a pair of side wall projections P in which one side should protrude and the other side should be inserted such that the guide grooves have different shapes. 
     The three guide grooves provided in the third lens barrel  1230  or the housing  1010 , respectively, may be provided as the shape illustrated in the enlarged view of  FIG.  16    ({circle around ( 1 )}, {circle around ( 2 )}, and {circle around ( 3 )}). First, {circle around ( 1 )} may have a shape in which one of the third lens barrel  1230  or the housing  1010  includes a ‘V’ groove (in this case, a bottom thereof may be cut) and side wall protrusions P protruding from both sides, may allow the ball members  1235  to contact four surfaces dotted on one of the guide grooves and only contact two side walls of the ‘V’ grooves on the other guide groove, and thereby restraining in the optical axis (the Z-axis) direction, the X-axis direction perpendicular to the optical axis direction, and the Y-axis direction perpendicular to the optical axis and the X axis directions. {circle around ( 2 )} may be a guide groove viewed as having a ‘V’ shaped groove (in this case, a bottom thereof may be cut), long in the optical axis direction, may allow the ball members  1235  to only contact two surfaces of which a dot is drawn, and may constrain the third lens barrel  1230  in the X-axis and Y-axis directions, and {circle around ( 3 )} may be a guide groove having a long and flat bottom in the optical axis direction, may allow the ball members  1235  to only contact one surface of which a dot is drawn, and may constrain the third lens barrel  1230  in the Y-axis direction. As a result, since the X, Y, and Z axis directions of the third lens barrel  1230  may be constrained by the conditions of {circle around ( 1 )}, {circle around ( 2 )}, and {circle around ( 3 )}, the third lens barrel  1230  may be accurately positioned by simply placing the ball members  1235  for inserting the third lens barrel  1230  into the guide grooves  1234  and  1015  into the housing  1010 . 
       FIGS.  17 A through  21 B  are views illustrating a positional relationship between a magnet and four Hall sensors, provided in a lens barrel according to an example, and are graphs illustrating sensing values of four Hall sensors according to movement of the lens barrel in the positional relationship.  FIGS.  17 A through  21 B  include graphs illustrating individual sensing values and the sum of all sensing values of Hall sensors according to optical axis movement of a lens barrel according to an arrangement of the Hall sensors in various examples, provided to face the lens barrel moving in the optical axis (Z-axis) direction, for example, a first or second lens barrel. 
     First, referring to  FIG.  17 A , a lens barrel moving in the optical axis (Z-axis) direction, for example, a first or second lens barrel  1210  or  1220 , may move a considerable distance in the optical axis direction to perform a zoom or auto focus function, and a position according to the distance movement may be sensed with Hall sensors  1241   c  or  1243   c  as accurately as possible. 
     Therefore, in this example, a plurality of position detection sensors, for example, the Hall sensors  1241   c  or  1243   c , are provided to face the magnet  1241   a  or  1243   a  provided in the first or second lens barrel  1210  or  1220 . More specifically, a set including four position detection sensors, for example, the Hall sensors  1241   c  or  1243   c  may be provided. 
     In this example, the magnet may be a magnet used to drive the lens barrel or may be provided separately from the lens barrel for position sensing, irrespective of the driving. Hereinafter, the magnet may be also a magnet used to drive the lens barrel or may be provided separately from the lens barrel for position sensing, irrespective of the driving, even in the position sensing structure of the lens barrel according to another example. 
     In this example, the magnet  1241   a  or  1243   a  may be provided to have an N pole and an S pole in a direction parallel to the optical axis, which is the moving direction of the first or second lens barrel  1210  or  1220 . For example, the magnet  1241   a  or  1243   a  may be a two-pole magnet magnetized to have the N pole and the S pole in the optical axis direction (in this case, there may be a ‘neutral region’ between the N pole and the S pole). Alternatively, the magnet  1241   a  or  1243   a  may be respectively magnetized to have one pole, such that the two magnets having the N pole and the S pole may be sequentially arranged on a surface facing the coil  1241   b  or  1243   b  in the optical axis direction (in this case, the N pole and the S pole may be in close contact or may be spaced apart to have ‘interval’ between the N pole and the S pole). In all examples, the term ‘interval region’ may be also used as a term including the ‘neutral region’ and the ‘interval.’ 
     The magnet  1241   a  or  1243   a  may be provided to face the coil  1241   b  or  1243   b.    
     In this case, in a non-driven state in which no power is applied to the coil  1241   b  or  1243   b , the Hall sensors (Hall  1 , Hall  2 , Hall  3 , and Hall  4 )  1241   c  or  1243   c  respectively facing the N and S poles of the magnet  1241   a  or  1243   a  may be provided, and the four Hall sensors may be arranged side by side inside a coiled portion of the coil  1241   b  or  1243   b  in the moving direction of the magnet  1241   a  or  1243   a . The four Hall sensors may be spaced apart by the same distance, or the Hall sensors (Hall  1  to Hall  4 ) arranged on the N pole and the S pole about a neutral region of the magnet may be provided symmetrically. 
     In this manner, when the magnet  1241   a  or  1243   a  and the four Hall sensors  1241   c  or  1243   c  are arranged, and the magnet  1241   a  or  1243   a  moves in both directions (+ or − direction) at the corresponding positions, the four Hall sensors (Hall  1  to Hall  4 ) may have respective sensing values according to positions of the magnet, as illustrated in  FIG.  17 B . In addition, it can be seen that when these values are summed (Hall  1 +Hall  2 +Hall  3 +Hall  4 ), the total hall sensing values (Hall Signal) may increase or decrease in approximate proportion to the movement of the magnet. In addition, the total hall sensing values summed within the moving range of the magnet may have different values. For example, it can be seen that the value of ‘Hall Signal’ in  FIG.  17 B  has different values in the range of −2 to 2 mm. 
     As a result, it may be difficult to sense the position of the magnet according to a relatively long distance movement with one or a relatively small number of Hall sensors, but it can be seen that when the plurality of Hall sensors (e.g., four) are used, although the magnet may travel a relatively long distance, it is possible to more accurately sense the position. 
     Referring to  FIGS.  18 A and  19 A , other examples in which only the number of Hall sensors is changed in the positional relationship illustrated in  FIG.  17 A  are illustrated. Referring to  FIGS.  18 B and  19 B , it can be seen that the sensing signal (Hall Signal) in which these are sensed and values thereby are summed may increase or decrease in approximate proportion to the movement of the magnet. 
     In this case, in a non-driven state in which no power is applied to the coil  1241   b  or  1243   b , the magnet  1241   a  or  1243   a  and the coil  1241   b  or  1243   b  may face each other in a direction facing their respective center, and the magnet  1241   a  or  1243   a  may be provided to have substantially the same distance of the N and S poles in the optical axis direction. 
     In other examples of  FIGS.  18 A and  19 A , the Hall sensors  1241   c  or  1243   c  may be disposed inside the coil  1241   b  or  1243   b , and the number of Hall sensors may be different from that illustrated in  FIG.  17 A . 
     For example, a plurality of position detection sensors (Hall sensors)  1241   c  or  1243   c  provided to face the magnet  1241   a  or  1243   a  provided in the lens barrel movable in the optical axis direction, for example, the first or second lens barrel  1210  or  1220 , for example, position detection sensors  1241   c  or  1243   c  composed of a set of three position detection sensors ( FIG.  18 A ) or five position detection sensors ( FIG.  19 A ) may be provided. In another example, the magnet  1241   a  or  1243   a  may be provided to have the N pole and the S pole in a direction parallel to the optical axis, which is the moving direction of the first or second lens barrel  1210  or  1220 . For example, the magnet  1241   a  or  1243   a  may be a two-pole magnet magnetized to have the N pole and the S pole in the optical axis direction (in this case, there may be a ‘neutral region’ between the N pole and the S pole). Alternatively, the magnet  1241   a  or  1243   a  may be respectively magnetized to have one pole, such that the two magnets having the N pole and the S pole may be sequentially arranged on a surface facing the coil  1241   b  or  1243   b  in the optical axis direction (in this case, the N pole and the S pole may be in close contact or may be spaced apart to have ‘interval’ between the N pole and the S pole). 
     The magnet  1241   a  or  1243   a  may face one coil  1241   b  or  1243   b . In this case, position detecting sensors (Hall sensors) respectively facing the N pole, the S pole, and the neutral region (or the ‘interval’) of the magnet  1241   a  or  1243   a  may be provided. 
     For example, the example illustrated in  FIG.  18 A  may include three position detecting sensors (Hall sensors, Hall  1  to Hall  3 )  1241   c  or  1243   c , and the three Hall sensors may be arranged side by side inside a coiled portion of the coil  1241   b  or  1243   b  in the moving direction of the magnet  1241   a  or  1243   a . The three Hall sensors may be spaced apart by the same distance. Alternatively, the Hall sensors (Hall  1  to Hall  3 ) may be provided to respectively face the N pole, the neutral region (or the ‘interval’), and the S pole of the magnet. 
     The example illustrated in  FIG.  19 A  may include five position detecting sensors (Hall sensors, Hall  1  to Hall  5 )  1241   c  or  1243   c , and the five Hall sensors may be arranged side by side inside a coiled portion of the coil  1241   b  or  1243   b  in the moving direction of the magnet  1241   a  or  1243   a . The five Hall sensors may be spaced apart by the same distance. For example, in a non-driven state in which no power is applied to the coil  1241   b  or  1243   b , the Hall sensors (Hall  1  to Hall  5 ) may be provided to respectively face the N pole, the neutral region (or the ‘interval’), and the S pole of the magnet. For example, two Hall sensors (Hall  1  and Hall  2 ) facing the N pole, one Hall sensor (Hall  3 ) facing the neutral region (or ‘interval’), and two Hall sensors (Hall  4  and Hall  5 ) facing the S pole may be provided. 
     In this manner, when the magnet  1241   a  or  1243   a  and the three or five Hall sensors  1241   c  or  1243   c  are arranged, and the magnet  1241   a  or  1243   a  move in both directions (+ or − direction) at the corresponding positions, the three or five Hall sensors may have respective sensing values according to positions of the magnets, as illustrated in  FIG.  18 B  (three Hall sensors) or  FIG.  19 B  (five Hall sensors). It can be seen that when these values are summed (Hall  1 +Hall  2 +Hall  3 , or Hall  1 +Hall  2 +Hall  3 +Hall  4 +Hall  5 ), the total hall sensing values (Hall Signal) may increase or decrease in approximate proportion to the movement of the magnet. 
     The total hall sensing values summed within the moving range of the magnet may have different values. For example, it can be seen that the values of ‘Hall Signal’ in  FIGS.  18 B and  19 B  have different values in the range of −2 to 2 mm. 
     As a result, it may be difficult to sense the position of the magnet according to a relatively long distance movement with one Hall sensor, but it can be seen that when two or more Hall sensors in an even number (e.g.,  FIG.  17 A ) or in an odd number (e.g.,  FIG.  18 A  and  FIG.  19 A ) are used, although the magnet may travel a relatively long distance, it is possible to more accurately sense the position. In this case, in a non-driven state in which no power is applied to the coil  1241   b  or  1243   b , the magnet  1241   a  or  1243   a  and the coil  1241   b  or  1243   b  may face each other in a direction facing their respective center, and the magnet  1241   a  or  1243   a  may be provided to have substantially the same distance of the N and S poles in the optical axis direction. 
     Next, referring to  FIG.  20 A or  21 A , a lens barrel moving in the optical axis direction, for example, a first or second lens barrel  1210  or  1220 , may move a considerable distance in the optical axis direction to perform a zoom or auto focus function, and a position according to the distance movement may be sensed with position detection sensors (Hall sensors)  1241   c  or  1243   c  as accurately as possible. 
     Therefore, in this example, a plurality of Hall sensors  1241   c  or  1243   c , for example, those composed of four or six Hall sensors as a set are provided to face a magnet  1241   a  or  1243   a  provided in the first or second lens barrel  1210  or  1220 . 
     The magnet in this example may be a magnet used to drive the lens barrel or may be provided separately from the lens barrel for position sensing. 
     In this example, the magnet  1241   a  or  1243   a  may be provided to have an N pole and an S pole alternately arranged in a direction parallel to the optical axis, which is the moving direction of the first or second lens barrel  1210  or  1220 . For example, the magnet may be provided to have at least poles (the N pole, the S pole, and the N pole) or poles (the S pole, the N pole, and the S pole) in the optical axis direction. For example, the magnet  1241   a  or  1243   a  may be a three-pole magnet magnetized to have at least three polarities, including the N pole and the S pole, in the optical axis direction (in this case, there may be a ‘neutral region’ between the N pole and the S pole). Alternatively, the magnet  1241   a  or  1243   a  may be respectively magnetized to have one pole, such that the at least three magnets having the N pole and the S pole may be sequentially arranged on a surface facing the coil  1241   b  or  1243   b  in the optical axis direction (in this case, the N pole and the S pole may be in close contact or may be spaced apart to have ‘interval’ between the N pole and the S pole). 
     The magnet  1241   a  or  1243   a  may be provided to face the coil  1241   b  or  1243   b  provided as a set composed of two coils (for example, coils facing the magnet may be at least two). In this case, the two coils  1241   b  or  1243   b  may be disposed to face a center of a pole magnetized to the same polarity on both sides. 
     Two or three Hall sensors (Hall  1  to Hall  4  or Hall  1  to Hall  6 )  1241   c  or  1243   c  respectively arranged to face two N poles or S poles on both sides of the magnet  1241   a  or  1243   a  may be provided. 
     For example, as illustrated in  FIG.  20 A , in a non-driven state in which no power is applied to the coil  1241   b  or  1243   b , when four Hall sensors (Hall  1  to Hall  4 ) are provided, total of four Hall sensors may be arranged to face the magnet, two at each of two left and right ends of the two N poles provided at both sides, with the S pole interposed therebetween. 
     In addition, when six Hall sensors (Hall  1  to Hall  6 ) are provided, as illustrated in  FIG.  21 A , two at the left and right ends of two N poles provided at both sides with the S pole therebetween, i.e., three for each pole, six Hall sensors in total may be arranged. 
     The Hall sensors (Hall  1  to Hall  4  or Hall  1  to Hall  6 )  1241   c  or  1243   c  may be arranged at equal intervals between sets facing the same polarity at different positions of the magnet  1241   a  or  1243   a . For example, as illustrated in  FIG.  20 A or  21 A , arrangements of the Hall sensors disposed inside the coil  1241   b  or  1243   b  on the left and right sides may be substantially the same. 
     In this manner, when the magnet  1241   a  or  1243   a  and the four or six Hall sensors  1241   c  or  1243   c  are arranged, and the magnet  1241   a  or  1243   a  move in both directions (+ or − direction) at the corresponding positions, the four or six Hall sensors may have respective sensing values according to positions of the magnets, as illustrated in  FIG.  20 B  or  FIG.  21 B . In addition, it can be seen that when these values are partially summed and subjected to subtraction, for example, subtraction of the sum of sensing values of all Hall sensors facing the other polarity of the magnet  1241   a  or  1243   a  from the sum of sensing values of all Hall sensors facing either polarity of the magnet  1241   a  or  1243   a , for example, {(Hall  1 +Hall  2 )−(Hall  3 +Hall  4 ), or (Hall  1 +Hall  2 +Hall  3 )−(Hall  4 +Hall  5 +Hall  6 )}, the total hall sensing values (Hall Signal) may increase or decrease in approximate proportion to the movement of the magnet. In addition, the total hall sensing values summed within the moving range of the magnet may have different values. For example, it can be seen that the values of ‘Hall Signal’ in  FIGS.  20 B and  21 B  have different values in the range of −2 to 2 mm. 
     As a result, it may be difficult to sense the position of the magnet according to a relatively long distance movement with one Hall sensor, but it can be seen that when four or six Hall sensors are used, although the magnet may travel a relatively long distance, it is possible to more accurately sense the position. Of course, the number of Hall sensors is not limited thereto, and it is applicable when two or more Hall sensors are dividedly arranged to face the same polarity in both sides of the three-pole magnet. In this case, in a non-driven state in which no power is applied to the coil  1241   b  or  1243   b , the magnet  1241   a  or  1243   a  and the coil  1241   b  or  1243   b  may face each other in a direction facing their respective center, and the magnet  1241   a  or  1243   a  may be provided to have substantially the same distance of at least two N poles (or S poles), facing the Hall sensors, in the optical axis direction. 
       FIG.  22    is a perspective view of a main board according to an example, with coils and components mounted thereon. 
     Referring to  FIG.  22   , coils  1141   b ,  1143   b , and  1145   b  of the first driving portion  1140  for driving the reflection module  1100 , and the plurality of coils  1241   b ,  1243   b , and  1245   b  of the second driving portion  1240  for driving the lens module  1200  may be mounted on an internal surface of the main board  1070  according to an example. Further, a component  1178  such as a passive element, an active element, or the like, a gyro sensor  1079 , and the like, may be mounted on an external surface of the main board  1070 . Therefore, the main board  1070  may be double-sided. 
     Specifically, the main board  1070  may include first and second side boards  1071  and  1072  disposed approximately in parallel to each other, and a bottom board  1073  mutually connecting the first and second side boards  1071  and  1072 . A terminal portion  1074  for external power and signal connection may be connected to any one of the first and second side boards  1071  and  1072  and the bottom board  1073 . 
     Some (for example, coil  1143   b , as illustrated) of the plurality of coils of the first driving portion  1140  for driving the reflection module  1100 , and a sensor  1143   c , and some (for example, coils  1241   b  and  1245   b , as illustrated) of the plurality of coils of the second driving portion  1240  for driving the lens module  1200 , and sensors  1241   c  and  1245   c  may be mounted on the first side board  1071 . 
     Some (for example, coil  1145   b , as illustrated) of the plurality of coils of the first driving portion  1140  for driving the reflection module  1100 , and some (for example, coil  1243   b , as illustrated) of the plurality of coils of the second driving portion  1240  for driving the lens module  1200 , and sensor  1243   c  may be mounted on the second side board  1072 . 
     The coil  1141   b  of the first driving portion  1140  for driving the reflection module  1100 , and the sensor  1141   c  sensing the position of the reflection module  1100  may be mounted on the bottom board  1073 . 
     Although the first side board  1071  is illustrated in the drawing as having components  1178  such as various passive elements and active elements, the gyro sensor  1079 , and the like, mounted thereon, the components  1178 , the gyro sensor  1079 , and the like may be mounted on the second side board  1072 , or may be suitably divided and mounted on the first and second side boards  1071  and  1072 . 
     Further, the plurality of coils  1141   b ,  1143   b ,  1145   b ,  1241   b ,  1243   b , and  1245   b  as well as the position detection sensors  1141   c ,  1143   c ,  1241   c ,  1243   c , and  1245   c , which may be mounted on the first side board  1071 , the second side board  1072  and the bottom board  1073 , may be variously divided and mounted on each board according to the design of a camera module. 
       FIG.  23    is a perspective view of a portable electronic device according to another example. 
     Referring to  FIG.  23   , a portable electronic device  2  may be a portable electronic device mounted with a plurality of camera modules  500  and  1000 , such as a mobile communications terminal, a smartphone, a tablet PC, or the like. 
     The plurality of camera modules  500  and  1000  may be mounted in the portable electronic device  2 . 
     At least one of the plurality of camera modules  500  and  1000  may be the camera module  1000  according to and the various examples described with reference to  FIGS.  2  through  16   . 
     For example, in the case of a portable electronic device including a dual camera module, at least one of two camera modules may be provided as the camera module  1000  according to the various examples. 
     Through this example, the camera module and the portable electronic device including the same may have a simple structure and a reduced size while implementing the functions such as the AF function, the zoom function, the OIS function, and the like. In addition, power consumption may be minimized. 
     The camera module may have a simple structure and a reduced size while implementing the functions such as the AF function, the zoom function, the OIS function, and the like. 
     Further, the various examples allow for easy alignment in an optical axis direction, even when the plurality of lens groups are provided. 
     In addition, a stopper or a damper may be provided such that both the zoom lens and the reflection module may be not separated from the optimal position. 
     In addition, in order to express performance of a zoom lens to the maximum, it is possible to accurately measure a movement position of the zoom lens by a plurality of Hall sensors. 
     While this disclosure includes specific examples, it will be apparent to one of ordinary skill in the art 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 to have 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.