Patent Publication Number: US-2023161227-A1

Title: Camera actuator and camera module including same

Description:
TECHNICAL FIELD 
     An embodiment relates to a camera actuator and a camera module. 
     BACKGROUND ART 
     A camera module captures a subject and stores it as an image or video, and is installed in various devices such as mobile terminals such as cell phones, laptops, drones, and vehicles. 
     In general, the device described above is equipped with a miniature camera module, and the camera module can perform an autofocus (AF) function of automatically adjusting the distance between the image sensor and the lens to align the focal lengths of the lenses. In addition, the camera module may perform a zooming function of zooming up or zooming out by increasing or decreasing the magnification of a distant subject through a zoom lens. 
     Meanwhile, a zoom actuator is used for a zooming function in the camera module. However, friction torque is generated when the lens is moved due to the mechanical movement of the actuator, and problems such as a decrease in driving force, an increase in power consumption, and a decrease in control characteristics occur due to the friction torque. 
     In particular, in order to derive the optical properties, not only alignment between a plurality of lens groups but also alignment of a plurality of lens groups with the image sensor must be well matched. However, when the center of the spherical surface between the lens groups deviates from the optical axis, tilt, which is a lens inclination phenomenon, or a phenomenon that the central axis of the lens group and the image sensor is not aligned, there is a problem in that the image quality or resolution is deteriorated because the angle of view is changed or the focus is out of focus. 
     In addition, when increasing the separation distance in a region where friction is generated to reduce friction torque resistance when moving the lens for the zoom function in the camera module, there is a technical problem in that a lens decent or a lens tilt is deepened when the zoom movement or the zoom movement is reversed. 
     In addition, recent camera modules employ image stabilization (IS) technology to correct or prevent image stabilization due to camera movement caused by an unstable fixing device or a user&#39;s movement. 
     Such image stabilization (IS) technology includes an optical image stabilizer (OIS) technology and an image stabilization prevention technology using an image sensor. Here, OIS technology is a technology that corrects motion by changing the path of light, and the image stabilization prevention technology using the image sensor is a technology that compensates for motion in both mechanical and electronic ways, and recently, OIS technology is being adopted more and more. 
     Meanwhile, the camera module may include a reflective member, a driving unit, etc. that can change the path of light to implement the OIS function. In detail, the camera module may change the path of light by controlling the position of the reflective member with the driving force applied from the driving unit. The position of the reflective member may be controlled by using a VCM (Voice Coil Motor) type driving unit including a coil, a magnet, etc. as the driving unit. 
     However, in the case of the above method, a support part such as a ball bearing and a guide rail for supporting the reflective member is additionally required and thus takes up a lot of volume, which limits implementation in a small size. 
     In addition, in the case of the above method, there is a problem in that accuracy deviation occurs due to problems such as noise and sync generated during driving, and there is a problem in that it is difficult to finely control the position of the reflective member. 
     Due to this, the optical characteristics of the camera module may be deteriorated, and there is a problem that the effect according to the OIS operation is insignificant. 
     Therefore, a new camera module capable of solving the above problems is required. 
     DISCLOSURE 
     Technical Problem 
     An embodiment provides a camera actuator and a camera module having improved optical properties. 
     In addition, the embodiment provides a camera actuator and a camera module that can effectively control the vibration generated by hand shake. 
     In addition, the embodiment provides a camera actuator and a camera module that can be implemented in a compact size having a small volume. 
     In addition, the embodiment provides a camera actuator and a camera module having improved autofocus and high magnification zoom functions. 
     In addition, the embodiment provides a camera actuator and a camera module capable of preventing problems such as de-centering, tilting, friction, etc. occurring when the lens group is moved. 
     Technical Solution 
     A camera actuator according to an embodiment includes a housing; a prism unit disposed in the housing; a first driving unit disposed in the housing and controlling a tilt of the prism unit; and a second driving unit disposed under the housing and controlling a tilt of the housing, wherein the first driving unit includes a first piezoelectric device disposed in a region overlapping a center of the prism unit in a first direction, wherein the second driving unit includes a second piezoelectric device disposed in a region overlapping the center of the prism unit in a second direction different from the first direction, wherein the prism unit is provided to be tiltable in the second direction by the first driving unit, and wherein the housing is provided to be tiltable in the first direction by the second driving unit. 
     In addition, the housing includes a lower part; first and second side parts extending upwardly on the lower part and facing each other; and an upper part disposed on the first and second side parts and connecting the first and second side parts; and wherein the first piezoelectric device is disposed between the first side part and a first outer surface of the prism unit. 
     In addition, the housing further includes a partition wall disposed between the first side part and the prism unit, wherein the first piezoelectric device is disposed between the partition wall and the first outer surface. 
     In addition, the first driving unit includes: a first yoke disposed between the first side part and the partition wall; and a first magnet disposed between the partition wall and the first outer surface, wherein the first yoke and the first magnet are disposed in a region that does not overlap the first piezoelectric device in the first direction, and wherein the prism unit is pressed in a direction toward of the partition wall by an attractive force of the first yoke and the first magnet. 
     In addition, the first driving unit further includes: a second yoke disposed between the first side part and the partition wall; and a second magnet disposed between the partition wall and the first outer surface, and wherein the first piezoelectric device is disposed between the first and second magnets. 
     In addition, the first magnet includes a first-first magnet having a first polarity; and a first-second magnet having a second polarity opposite to the first polarity, wherein the first-first magnet is disposed on the first-second magnet. 
     In addition, the camera actuator further includes a first sensing unit disposed between the first magnet and the first yoke, and wherein the first sensing unit is disposed in a region corresponding to a boundary of the first-first and first-second magnets. 
     In addition, the camera actuator further includes a base member disposed under the housing, and wherein the second piezoelectric device is disposed between the housing and the base member. 
     In addition, the second driving unit includes: a third yoke disposed on the housing; and a third magnet disposed between the housing and the base member, wherein the third yoke and the third magnet are disposed in a region that does not overlap the second piezoelectric device in the second direction, and wherein the housing is pressed in a direction toward of the base member by an attractive force of the third yoke and the third magnet. 
     In addition, the second driving unit further includes a fourth yoke disposed on the housing and spaced apart from the third yoke, and a fourth magnet disposed between the housing and the base member, and wherein the second piezoelectric device is disposed between the third and fourth magnets. 
     In addition, the camera actuator further includes a second sensing unit disposed between the third magnet and the third yoke. 
     In addition, the first piezoelectric device is in direct contact with the prism unit, and the second piezoelectric device is in direct contact with the housing. 
     In addition, the first driving unit includes a first elastic member for pressing the prism unit in a direction toward of the first piezoelectric device. 
     In addition, the second driving unit includes a second elastic member for pressing the housing in a direction toward of the second piezoelectric device. 
     In addition, the camera actuator further includes a first guide protrusion disposed on one side of the partition wall and having a shape protruding toward the prism unit, and wherein the first guide protrusion is disposed in a region overlapping the center of the prism unit in the first direction. 
     In addition, the camera actuator further includes a second guide protrusion disposed on the lower part of the housing and having a shape protruding toward the base member, wherein the second guide protrusion is disposed in a region overlapping the center of the prism unit in the second direction. 
     In addition, a camera module according to an embodiment includes a first camera actuator and a second camera actuator, wherein the first camera actuator performs an OIS (Optical Image Stabilizer) function, and the second camera actuator performs an auto focusing or zoom function, and the first camera actuator may include the camera actuator. 
     In addition, light incident on the camera module from an outside is incident on the second camera actuator through the first camera actuator. 
     Advantageous Effects 
     The camera actuator and the camera module according to the embodiment may have improved optical properties. In detail, in the camera actuator and the camera module according to the embodiment, the driving unit for controlling the position of the prism may include a piezoelectric device, and the position of the prism may be more precisely controlled by the driving unit. Accordingly, the embodiment can more effectively control vibrations caused by hand shake, thereby providing an improved OIS function. 
     In addition, the camera actuator and the camera module according to the embodiment may be implemented in a smaller size. In detail, the driving unit may control the position of the prism by frictional force caused by mechanical deformation of the piezoelectric device. Accordingly, the driving unit according to the embodiment may be provided in a smaller size compared to the VCM type driving unit including a ball bearing, a guide rail, and the like, and friction generated during position control of the prism may be minimized. 
     In addition, the camera actuator and the camera module according to the embodiment may have improved optical properties. In detail, in the camera actuator and camera module according to the embodiment, the driving unit for moving the lens group includes a piezoelectric device, and the driving unit can more precisely control the lens group. In addition, the camera actuator and the camera module according to the embodiment can minimize friction that occurs when the lens group is moved, and can prevent de-centering and tilting, so that the position of the lens group can be more precisely controlled. Accordingly, the embodiment may provide improved autofocus and zoom functions. 
     In addition, the camera module according to the embodiment may include a plurality of camera actuators, for example, OIS and zoom/AF actuators, and each of the plurality of camera actuators may include a piezoelectric device as a driving unit. Accordingly, the camera module may omit a separate driving driver, for example, a VCM driving driver, in addition to the driving driver for driving the piezoelectric device, thereby simplifying the structure and having a slim shape. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is an exploded perspective view of a first camera actuator according to an embodiment. 
         FIG.  2    is a perspective view of a first housing of a first camera actuator according to an embodiment. 
         FIG.  3    is a top view of a first housing of a first camera actuator according to an embodiment. 
         FIG.  4    is an exploded perspective view of a prism unit of a first camera actuator according to an embodiment. 
         FIG.  5    is a perspective view of a prism unit of a first camera actuator according to an embodiment. 
         FIGS.  6  to  8    are a front view, a top view, and a perspective view in which a cover member is omitted in the first camera actuator according to the embodiment. 
         FIGS.  9  to  12    are views for explaining an arrangement relationship of a first driving unit of a first camera actuator according to an embodiment. 
         FIGS.  13  to  15    are views for explaining a second driving unit of a first camera actuator according to an embodiment. 
         FIGS.  16  to  19    are views for explaining an arrangement relationship of a second driving unit of a first camera actuator according to an embodiment. 
         FIG.  20    is another exploded perspective view of a first camera actuator according to an embodiment. 
         FIG.  21    is an exploded perspective view of a prism unit of the first camera actuator according to  FIG.  20   . 
         FIG.  22    is a perspective view of a prism unit of a first camera actuator according to  FIG.  20   . 
         FIG.  23    is a front view of a first camera actuator according to  FIG.  20   . 
         FIGS.  24  and  25    are views for explaining an arrangement relationship of a first driving unit of a first camera actuator according to  FIG.  20   . 
         FIGS.  26  to  28    are views for explaining an arrangement relationship of a second driving unit of a first camera actuator according to  FIG.  20   . 
         FIG.  29    is a perspective view of a camera module according to an embodiment. 
         FIG.  30    is a perspective view in which some components are omitted from a camera module according to an embodiment. 
         FIG.  31    is an exploded perspective view of a second camera actuator according to an embodiment. 
         FIG.  32    is a cross-sectional view of a second camera actuator according to an embodiment. 
         FIG.  33    is a front view of a second camera actuator according to an embodiment. 
         FIG.  34    is a perspective view illustrating third and fourth driving units disposed in a first housing of a second camera actuator according to an embodiment. 
         FIG.  35    is an exploded perspective view of a third driving unit according to an embodiment. 
         FIG.  36    is an exploded perspective view of a fourth driving unit according to the embodiment. 
         FIG.  37    is a perspective view of a partial configuration of the second camera actuator according to the embodiment. 
         FIG.  38    is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied. 
         FIG.  39    is a perspective view of a vehicle to which a camera module according to an embodiment is applied. 
     
    
    
     MODES OF THE INVENTION 
     Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     However, the spirit and scope of the present invention is not limited to a part of the embodiments described, and may be implemented in various other forms, and within the spirit and scope of the present invention, one or more of the elements of the embodiments may be selectively combined and substituted for use. 
     In addition, unless expressly otherwise defined and described, the terms used in the embodiments of the present invention (including technical and scientific terms may be construed the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms such as those defined in commonly used dictionaries may be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art. 
     Further, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular forms may also include the plural forms unless specifically stated in the phrase, and may include at least one of all combinations that may be combined in A, B, and C when described in “at least one (or more) of A (and), B, and C”. 
     Further, in describing the elements of the embodiments of the present invention, the terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the elements from other elements, and the terms are not limited to the essence, order, or order of the elements. In addition, when an element is described as being “connected”, “coupled”, or “connected” to another element, it may include not only when the element is directly “connected” to, “coupled” to, or “connected” to other elements, but also when the element is “connected”, “coupled”, or “connected” by another element between the element and other elements. 
     In addition, when described as being formed or disposed “on (over)” or “under (below)” of each element, the “on (over)” or “under (below)” may include not only when two elements are directly connected to each other, but also when one or more other elements are formed or disposed between two elements. Further, when expressed as “on (over)” or “under (below)”, it may include not only the upper direction but also the lower direction based on one element. 
     An optical axis direction used below may be defined as an optical axis direction of a lens coupled to a camera actuator and a camera module, and a vertical direction may be defined as a direction perpendicular to the optical axis. 
     A autofocus function used below may be defined a function to automatically focus on the subject by adjusting the distance from the image sensor by moving the lens in the optical axis direction according to the distance of the subject so that a clear image of the subject can be obtained by the image sensor. 
     Meanwhile, the auto focus may correspond to auto focus (AF). In addition, closed-loop auto focus (CLAF) control may be defined as real-time feedback control of the lens position by sensing the distance between the image sensor and the lens to improve focus adjustment accuracy. 
     In addition, before the description of the embodiment of the invention, a first direction may mean a x-axis direction shown in the drawings, a second direction may be a different direction from the first direction. For example, the second direction may mean a y-axis direction shown in the drawing in a direction perpendicular to the first direction. Also, a third direction may be different from the first and second directions. For example, the third direction may mean a z-axis direction shown in the drawing in a direction perpendicular to the first and second directions. Here, the third direction may mean an optical axis direction. 
     Hereinafter, the configuration of the camera module according to the present embodiment will be described with reference to the drawings. 
       FIG.  1    is an exploded perspective view of a first camera actuator according to an embodiment. The first camera actuator  1000  may be an optical image stabilizer (OIS) actuator. The first camera actuator  1000  may change the path of the light incident on the camera module  10 . 
     Referring to  FIG.  1   , the first camera actuator  1000  according to the embodiment may include a cover member  100 , a first housing  200 , a first driving unit  301 , a second driving unit  302 , a prism unit  400  and a base member  500 . 
     The cover member  100  may include an accommodating space therein, and at least one side surface may be open. For example, the cover member  100  may have a structure in which a plurality of side surfaces connected to each other are opened. In detail, the cover member  100  may have an open structure in which an upper surface through which light is incident from an outside, one side corresponding to the first camera actuator  1000  and a lower surface opposite to the upper surface are open, and a light movement path of the prism unit  400  to be described later may be provided. 
     The cover member  100  may include a rigid material. For example, the cover member  100  may include a material having a predetermined reliability, such as resin, metal, ceramic, and the like, and may support the first housing  200  disposed in the accommodation space. For example, the cover member  100  may be disposed surrounding the first housing  200 , the prism unit  400 , the first driving unit  301  and the second driving unit  302  and the like, and may support the components. 
       FIG.  2    is a perspective view of a first housing of a first camera actuator according to an embodiment, and  FIG.  3    is a top view of a first housing of a first camera actuator according to an embodiment. 
       FIGS.  2  and  3   , the first housing  200  may have a structure in which a plurality of side surfaces are opened. For example, the first housing  200  may include a lower part  210 , a first side part  221 , a second side part  222 , and an upper part  230 . 
     The lower part  210  has a plate shape and may extend in a first direction (x-axis direction). 
     The first side part  221  and the second side part  222  may be respectively disposed in an edge region of the lower part  210 . The first side part  221  and the second side part  222  may extend in an upper direction (y-axis direction) from an edge of the lower part  210 . The first side part  221  and the second side part  222  may be disposed to face each other in the first direction. The first side part  221  and the second side part  222  may be parallel. 
     The upper part  230  may be disposed on the lower part  210 . The upper part  230  may be disposed on the first side part  221  and the second side part  222  and may connect ends of the first side part  221  and the second side part  222 . The upper part  230  may be disposed to face the lower part  210  in the second direction. The upper part  230  may be parallel to the lower part  210 . 
     The upper part  230  of the first housing  200  may be opened. In detail, the upper part  230  of the first housing  200  may have an open region corresponding to an upper surface of the cover member  100 . Also, a region corresponding to one side of the cover member  100 , for example, a region between the first side part  221  and the second side part  222  may be opened. Also, a region corresponding to the other side opposite to one side of the cover member  100  in the first housing  200  may be opened. Accordingly, the first housing  200  may provide a light movement path of the prism unit  400  to be described later. 
     The first housing  200  may further include a partition wall  250  disposed on the lower part  210 . The partition wall  250  may extend from the lower part  210  toward the upper part  230 . The partition wall  250  may be disposed between the first side part  221  and the second side part  222  and may be parallel to the first side part  221  and the second side part  222 . The partition wall  250  may be disposed adjacent to the first side part  221  than the second side part  222 . 
     The partition wall  250  may include a first guide protrusion  271 . The first guide protrusion  271  may be disposed on one side facing the second side part  222 . The first guide protrusion  271  may have a shape protruding from one side of the partition wall  250  toward the second side part  222 . The first guide protrusion  271  may be disposed in a region corresponding to the first piezoelectric device  310  to be described later. The first guide protrusion  271  may be disposed in a region overlapping a center of the prism unit  400  in the first direction (x-axis direction). The first guide protrusion  271  may be disposed in a region overlapping the center of the prism  410  in the first direction. 
     The first housing  200  may include a plurality of accommodation spaces. For example, the first housing  200  may include a first accommodating space  205  and a second accommodating space  255  separated by the partition wall  250 . 
     The first accommodation space  205  may be disposed between the partition wall  250  and the second side part  222 . The prism unit  400  may be disposed in the first accommodation space  205 . In addition, the second accommodation space  255  may be disposed between the partition wall  250  and the first side part  221 . A part of the configuration of the first driving unit  301  may be disposed in the second accommodation space  255 . 
       FIG.  4    is an exploded perspective view of the prism unit of the first camera actuator according to the embodiment, and  FIG.  5    is a perspective view of the prism unit of the first camera actuator according to the embodiment. 
     Referring to  FIGS.  4  and  5   , the prism unit  400  may include a prism  410  and a prism mover  430  disposed on the prism  410 . 
     The prism  410  may be a right-angle prism. The prism  410  may reflect the direction of light incident from the outside. That is, the prism  410  may change the path of the light incident on the first camera actuator  1000  from the outside toward the second camera actuator  2000  to be described later. 
     The prism mover  430  may be disposed on the prism  410 . The prism mover  430  may be disposed to surround the prism  410 . At least one side of the prism mover  430  may be open and may include an accommodating space therein. In detail, the prism mover  430  may have a structure in which a plurality of outer surfaces connected to each other are opened. For example, the prism mover  430  may have a structure in which an outer surface corresponding to the prism  410  is open, and may include an accommodation space defined as a first space  435  therein. The first space  435  may have a shape corresponding to the prism  410 . The prism  410  may be coupled to the prism mover  430  in the first space  435 . 
     The prism unit  400  may include a plurality of outer surfaces. For example, the prism mover  430  may include a plurality of outer surfaces. The prism mover  430  may include a first outer surface  430 S 1  facing the partition wall  250  and a second outer surface  430 S 2  facing the second partition wall  250 . In addition, the prism mover  430  may include a third outer surface  430 S 3  facing the lower part  210  and a fourth outer surface  430 S 4  disposed between the first to third outer surfaces  430 S 1 ,  430 S 2  and  430 S 3  and connects the first to third outer surfaces  430 S 1 ,  430 S 2  and  430 S 3 . 
     Also, the prism mover  430  may include a first recess  430 R 1 . The first recess  430 R 1  may be disposed on the first outer surface  430 S 1 . The first recess  430 R 1  may be disposed in a region overlapping the center of the prism unit  400  in the first direction (x-axis direction). The first recess  430 R 1  may have a concave groove shape in a direction from the first outer surface  430 S 1  to the second outer surface  430 S 2 . 
     The first recess  430 R 1  may be disposed in a region corresponding to the first guide protrusion  271 . In detail, the first recess  430 R 1  may be disposed in a region overlapping the first guide protrusion  271  in the first direction. The first recess  430 R 1  may have a shape corresponding to that of the first guide protrusion  271  and a depth corresponding to that of the first guide protrusion  271 . The first recess  430 R 1  may provide a space in which the first guide protrusion  271  is inserted. The prism unit  400  may be tilted in the vertical direction (y-axis direction) using the first guide protrusion  271  as a rotation axis. 
       FIGS.  6  to  8    are a front view, a top view, and a perspective view in which a cover member is omitted in the first camera actuator according to the embodiment. 
     Referring to  FIGS.  6  to  8   , the first driving unit  301  may be disposed in the first housing  200 . The first driving unit  301  may be disposed adjacent to the first side part  221 . For example, the first driving unit  301  may be disposed between the first side part  221  and the prism unit  400 . 
     The first driving unit  301  may include a first piezoelectric device  310 , a first yoke  331 , and a first magnet  351 . 
     The first piezoelectric device  310  may be disposed between the first side part  221  and the prism unit  430 . The first piezoelectric device  310  may be disposed in the first accommodation space  205 . The first piezoelectric device  310  may be disposed between the first outer surface  430 S 1  of the prism unit  400  and the partition wall  250 . The first piezoelectric device  310  may be disposed on a region corresponding to the first guide protrusion  271  and the first recess  430 R 1 . The first piezoelectric device  310  may be disposed in a region corresponding to the center of the prism unit  400  in the first direction. The first piezoelectric device  310  may be disposed in direct contact with the first outer surface  430 S 1 . 
     The first piezoelectric device  310  may include a piezo-electric device. The first piezoelectric device  310  may include a ceramic material. For example, the first piezoelectric device  310  may include may include at least one of ZnO, AlN, LiNbO4, lead antimony stannate, lead magnesium tantalate, lead nickel tantalate, titanates, tungstates, zirconates, or lead zirconate titanates [Pb(ZrxTi1−x)O3 (PZT)], lead lanthanum zirconate titanate (PLZT), lead niobium zirconate titanate (PNZT), BaTiO3, SrTiO3, lead magnesium niobate, lead nickel niobate, lead manganese niobate, lead zinc niobate, lead, barium and bismuth, including lead titanate, and niobates of strontium. 
     The first piezoelectric device  310  may control the tilt of the prism unit  400 . The first piezoelectric device  310  may have a cylindrical shape. The first piezoelectric device  310  may cause mechanical deformation by an applied power. For example, an upper surface of the first piezoelectric device  310  facing the first outer surface  430 S 1  may be deformed into a wave shape by the applied power. 
     In detail, the first piezoelectric device  310  may include a plurality of first piezoelectric parts (not shown). The plurality of first piezoelectric parts may be disposed along a circumference of a concentric circle shape from a center of the first piezoelectric device  310  in the first direction. 
     The plurality of first piezoelectric parts may include a plurality of first-first piezoelectric parts spaced apart from each other and a first-second piezoelectric part disposed between the plurality of first-first piezoelectric parts. At this time, the upper surface of the first piezoelectric device  310  may be deformed into a continuous wave shape due to a difference in power applied to each of the plurality of first-first piezoelectric parts and the plurality of first-first piezoelectric parts, and, a frictional force may be generated between the first piezoelectric device  310  and the first outer surface  430 S 1  due to the deformation. That is, the prism unit  400  may be tilted in the vertical direction (y-axis direction) by a friction force between the first piezoelectric device  310  and the first outer surface  430 S 1 . 
     In addition, the first piezoelectric device  310  may further include a first guide hole  311 . The first guide hole  311  may be disposed in a region corresponding to the first guide protrusion  271  and the first recess  430 R 1 . The first guide hole  311  may be a hole penetrated in the first direction. When the first piezoelectric device  310  includes the first guide hole  311 , the first piezoelectric device  310  may have a donut shape. 
     The first guide hole  311  may have a shape corresponding to the first guide protrusion  271  for insertion of the first guide protrusion  271 . The first guide protrusion  271  may be inserted into the first recess  430 R 1  through the first guide hole  311 . 
     Accordingly, the first piezoelectric device  310  and the prism unit  400  may have positions set by the first guide protrusion  271 . In addition, it is possible to prevent the first piezoelectric device  310  and the prism unit  400  from being separated from a set rotation axis, in the process in which the prism unit  400  is tilted in the vertical direction (y-axis direction) by the first guide protrusion  271  and the first guide hole  311 . 
     The first yoke  331  may be disposed in the second accommodation space  255 . The first yoke  331  may be disposed between the first side part  221  and the partition wall  250 . The first yoke  331  may be disposed on the other side opposite to one side of the partition wall  250 . 
     The first yoke  331  may be disposed in a region that does not correspond to the first piezoelectric device  310 . For example, the first yoke  331  may be disposed in a region that does not overlap the first piezoelectric device  310  in the first direction. 
     The first magnet  351  may be disposed in the first accommodation space  205 . The first magnet  351  may be disposed between the partition wall  250  and the prism unit  400 . The first magnet  351  may be disposed between the partition wall  250  and the first outer surface  430 S 1 . The first magnet  351  may be fixed on the first outer surface  430 S 1 . 
     The first magnet  351  may be spaced apart from the first piezoelectric device  310 . The first magnet  351  may be disposed in a region that does not correspond to the first piezoelectric device  310 . For example, the first magnet  351  may be disposed in a region that does not overlap the first piezoelectric device  310  in the first direction. Also, the first magnet  351  may be disposed in a region corresponding to the first yoke  331 . In detail, the first magnet  351  may be disposed in a region overlapping the first yoke  331  in the first direction. 
     The first yoke  331  and the first magnet  351  may arrange the prism unit  400  at a set position. For example, a magnetic attraction may be generated between the first yoke  331  and the first magnet  351 . The prism unit  400  may be pressed in a direction toward of the partition wall  250  by the magnetic attraction. Accordingly, the prism unit  400  may be disposed at a position overlapping the center of the first piezoelectric device  310  in the first direction without a separate fixing member. 
     In addition, the first driving unit  301  may further include a second yoke  332  and a second magnet  352 . 
     The second yoke  332  may be disposed in the second accommodation space  255 . The second yoke  332  may be disposed between the first side part  221  and the partition wall  250 . The second yoke  332  may be disposed on the other side of the partition wall  250 . The second yoke  332  may be spaced apart from the first yoke  331 . For example, the second yoke  332  may be spaced apart from the first yoke  331  in the optical axis (z-axis direction). 
     Also, the second yoke  332  may be disposed in a region that does not correspond to the first piezoelectric device  310 . For example, the second yoke  332  may be disposed in a region that does not overlap the first piezoelectric device  310  in the first direction. The first piezoelectric device  310  may be disposed between the first yoke  331  and the second yoke  332 . 
     The second magnet  352  may be disposed in the first accommodation space  205 . The second magnet  352  may be disposed between the partition wall  250  and the prism unit  400 . The second magnet  352  may be disposed between the partition wall  250  and the first outer surface  430 S 1 . The first magnet  351  may be fixed on the first outer surface  430 S 1 . The second magnet  352  may be spaced apart from the first magnet  351 . For example, the second magnet  352  may be spaced apart from the first magnet  351  in the optical axis (z-axis direction). 
     Also, the second magnet  352  may be spaced apart from the first piezoelectric device  310 . The second magnet  352  may be disposed in a region that does not correspond to the first piezoelectric device  310 . For example, the second magnet  352  may be disposed in a region that does not overlap the first piezoelectric device  310  in the first direction. The first piezoelectric device  310  may be disposed between the first magnet  351  and the second magnet  352 . Also, the second magnet  352  may be disposed in a region corresponding to the second yoke  332 . In detail, the second magnet  352  may be disposed in a region overlapping the second yoke  332  in the first direction. 
     The second yoke  332  and the second magnet  352  may arrange the prism unit  400  at a set position. For example, a magnetic attraction may be generated between the second yoke  332  and the second magnet  352 . The prism unit  400  may be pressed in a direction toward of the partition wall  250  by the magnetic attraction. Accordingly, the prism unit  400  may be disposed at a position overlapping the center of the first piezoelectric device  310  in the first direction without a separate fixing member. 
     That is, the first camera actuator  1000  may include first and second yokes  331  and  332  and first and second magnets  351  and  352  disposed in the lateral direction of the prism unit  400 . At this time, each of the first and second yokes  331  and  332  and the first and second magnets  351  and  352  may be disposed side by side in the optical axis (z-axis direction) and may be disposed in a region surrounding the first piezoelectric device  310 . Accordingly, the prism unit  400  may be more stably disposed in the first housing  200 , and may be tilted more stably by the driving force of the first piezoelectric device  310 . Accordingly, the first camera actuator  1000  according to the embodiment may have improved reliability and optical characteristics. 
     The first driving unit  301  may include a first sensing unit  371 . The first sensing unit  371  may be disposed on one side of the partition wall  250 . The first sensing unit  371  may be disposed in a region corresponding to the first magnet  351  in the first direction. The first sensing unit  371  may include a hall sensor. The first sensing unit  371  may sense the position of the first magnet  351 . That is, the first sensing unit  371  may sense the position of the prism unit  400 . 
       FIG.  9    is a view for explaining an arrangement relationship of a first driving unit of a first camera actuator according to an embodiment. 
     Referring to  FIG.  9   , the first yoke  331  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the first yoke  331  may be longer than a length in the first direction. 
     The first magnet  351  may be disposed in a region corresponding to the first yoke  331  in the first direction. The first magnet  351  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the first magnet  351  may be longer than a length in the first direction. 
     The first magnet  351  may include a first-first magnet  351   a  having a first polarity and a first-second magnet  351   b  having a second polarity opposite to the first polarity. The first-first magnet  351   a  and the first-second magnet  351   b  may be disposed side by side in a third direction. The first-second magnet  351   b  may be disposed closer to the first piezoelectric device  310  than the first-first magnet  351   a.    
     In addition, the second yoke  332  may be spaced apart from the first yoke  331  in a third direction. The second yoke  332  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the second yoke  332  may be longer than a length in the first direction. 
     The second magnet  352  may be disposed in a region corresponding to the second yoke  332  in the first direction. The second magnet  352  may be spaced apart from the first magnet  351  in a third direction. The second magnet  352  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the second magnet  352  may be longer than a length in the first direction. 
     The second magnet  352  may include a second-first magnet  352   a  having the first polarity and a second-second magnet  352   b  having the second polarity. The second-first magnet  352   a  and the second-second magnet  352   b  may be disposed side by side in a third direction. The second-first magnet  352   a  may be disposed closer to the first piezoelectric device  310  than the second-second magnet  352   b.    
     The first sensing unit  371  may be disposed on a region between the first-first magnet  351   a  and the first-second magnet  351   b . For example, the first sensing unit  371  may be disposed on a region overlapping the boundary between the first-first magnet  351   a  and the first-second magnet  351   b  in the first direction. 
     Also, although not shown in the drawings, a plurality of magnets may be further disposed between the prism unit  400  and the housing  200 . For example, magnets having the same polarity may be disposed on the second outer surface  430 S 2  of the housing  200  and the second side part  222  facing the second outer surface  430 S 2 . Accordingly, a magnetic repulsive force may be generated between the plurality of magnets, and the prism unit  400  may be pressed in the direction toward of the partition wall  250  by the repulsive force. Accordingly, the prism unit  400  may have improved positional reliability within the housing  200 . 
     In addition,  FIGS.  10  to  12    are views for explaining another arrangement relationship of the first driving unit according to the embodiment. In the description using  FIGS.  10  to  12   , descriptions of the same and similar components as those of the first camera actuator described above are omitted, and the same reference numerals are assigned to the same and similar components. 
     Referring to  FIG.  10   , the first magnet  351  may be disposed in a region corresponding to the first yoke  331  in the first direction. The first magnet  351  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the first magnet  351  may be longer than a length in the first direction. 
     The first magnet  351  may include a first-first magnet  351   a  having the first polarity and a first-second magnet  351   b  having the second polarity. The first-first magnet  351   a  and the first-second magnet  351   b  may be arranged in parallel in a second direction (y-axis direction). That is, the first-second magnet  351   b  may be disposed below the first-first magnet  351   a  and may be adjacent to the lower part  210  of the first housing  200 . 
     In addition, the second magnet  352  may be disposed in a region corresponding to the second yoke  332  in the first direction. The second magnet  352  may be spaced apart from the first magnet  351  in a third direction. The second magnet  352  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the second magnet  352  may be longer than a length in the first direction. 
     The second magnet  352  may include a second-first magnet  352   a  having the first polarity and a second-second magnet  352   b  having the second polarity. The second-first magnet  352   a  and the second-second magnet  352   b  may be arranged side by side in the second direction. That is, the second-second magnet  352   b  may be disposed below the second-first magnet  352   a  and may be adjacent to the lower part  210  of the first housing  200 . 
     The first sensing unit  371  may be disposed on a region between the first-first magnet  351   a  and the first-second magnet  351   b . For example, the first sensing unit  371  may be disposed on a region overlapping the boundary between the first-first magnet  351   a  and the first-second magnet  351   b  in the first direction. A boundary between the first-first magnet  351   a  and the first-second magnet  351   b  may overlap a center of the first magnet  351  in a second direction (y-axis direction). That is, the first sensing unit  371  may be disposed in a region overlapping the center of the first magnet  351  in the first direction. 
     That is, the first sensing unit  371  may be disposed on a region overlapping the center of the first magnet  351 . Accordingly, when the prism unit  400  is tilted by the first driving unit  301 , the first sensing unit  371  can effectively sense the amount of rotation of the first magnet  351 , so that the position is more can be sensed accurately. 
     Referring to  FIG.  11   , the first driving unit  301  may omit the first yoke  331  and the second yoke  332 . The first driving unit  301  may include a fifth magnet  355  and a sixth magnet  356  instead of the first yoke  331  and the second yoke  332 . 
     The fifth magnet  355  may be disposed in the second accommodation space  255 . The fifth magnet  355  may be disposed between the first side part  221  and the partition wall  250 . The fifth magnet  355  may be disposed on the other side of the partition wall  250 . The fifth magnet  355  may be disposed in a region that does not correspond to the first piezoelectric device  310 . For example, the fifth magnet  355  may be disposed in a region that does not overlap the first piezoelectric device  310  in the first direction. 
     The fifth magnet  355  may be disposed in a region corresponding to the first magnet  351  in the first direction. The fifth magnet  355  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the fifth magnet  355  may be longer than a length in the first direction. 
     The fifth magnet  355  may include a fifth-first magnet  355   a  having a second polarity and a fifth-second magnet  355   b  having the first polarity. The fifth-first magnet  355   a  and the fifth-second magnet  355   b  may be disposed side by side in a third direction. The fifth-first magnet  355   a  may be disposed in a region overlapping with the first-first magnet  351   a  in the first direction, and the fifth-second magnet  355   b  may be disposed in a region overlapping with the first-second magnet  351   b  in the first direction. 
     The first magnet  351  and the fifth magnet  355  may arrange the prism unit  400  at a set position. For example, a magnetic attraction may be generated between the first-first magnet  351   a  and the fifth-first magnet  355   a , and between the first-second magnet  351   b  and the fifth-second magnet  355   b . and the prism unit  400  may be pressed in the direction toward of the partition wall by the magnetic attraction. Accordingly, the prism unit  400  may be disposed at a position overlapping the center of the first piezoelectric device  310  in the first direction without a separate fixing member. 
     In addition, the sixth magnet  356  may be disposed in the second accommodation space  255 . The sixth magnet  356  may be disposed between the first side part  221  and the partition wall  250 . The sixth magnet  356  may be disposed on the other side of the partition wall  250 . The sixth magnet  356  may be spaced apart from the fifth magnet  355 . For example, the sixth magnet  356  may be spaced apart from the fifth magnet  355  in the optical axis (z-axis direction). Also, the sixth magnet  356  may be disposed in a region that does not correspond to the first piezoelectric device  310 . For example, the sixth magnet  356  may be disposed in a region that does not overlap the first piezoelectric device  310  in the first direction. The first piezoelectric device  310  may be disposed between the fifth magnet  355  and the sixth magnet  356 . 
     The sixth magnet  356  may be disposed in a region corresponding to the second magnet  352  in the first direction. The sixth magnet  356  may have a shape extending in the second direction (y-axis direction). A length in the second direction of the sixth magnet  356  may be longer than a length in the first direction. 
     The sixth magnet  356  may include a sixth-first magnet  356   a  having a second polarity and a sixth-second magnet  356   b  having the first polarity. The sixth-first magnet  356   a  and the sixth-second magnet  356   b  may be disposed side by side in a third direction. The sixth-first magnet  356   a  may be disposed in a region overlapping the second-first magnet  352   a  in the first direction, and the sixth-second magnet  356   b  may be disposed in a region overlapping the second-second magnet  352   b  in the first direction. 
     The second magnet  352  and the sixth magnet  356  may arrange the prism unit  400  at a set position. For example, a magnetic attraction may be generated between the second-first magnet  352   a  and the sixth-first magnet  356   a  and between the second-second magnet  352   b  and the sixth-second magnet  356   b , and the prism unit  400  may be pressed in the direction toward of the partition wall by the magnetic attraction. Accordingly, the prism unit  400  may be disposed at a position overlapping the center of the first piezoelectric device  310  in the first direction without a separate fixing member. 
     The first sensing unit  371  may be disposed on a region between the first-first magnet  351   a  and the first-second magnet  351   b . For example, the first sensing unit  371  may be disposed on a region overlapping the boundary between the first-first magnet  351   a  and the first-second magnet  351   b  in the first direction. 
     That is, the first camera actuator  1000  may include a plurality of magnets  351 ,  352 ,  355 , and  356  disposed in a lateral direction of the prism unit  400 . In this case, the plurality of magnets  351 ,  352 ,  355 , and  356  may be disposed in a region surrounding the first piezoelectric device  310 . Accordingly, the prism unit  400  may be more stably disposed in the first housing  200 , and may be tilted more stably by the driving force of the first piezoelectric device  310 . 
     Also, referring to  FIG.  12   , the first magnet  351  may include a first-first magnet  351   a  having the first polarity and a first-second magnet  351   b  having the second polarity. The first-first magnet  351   a  and the first-second magnet  351   b  may be arranged in parallel in a second direction (y-axis direction). That is, the first-second magnet  351   b  may be disposed below the first-first magnet  351   a  and may be adjacent to the lower part  210  of the first housing  200 . 
     Also, the second magnet  352  may include a second-first magnet  352   a  having the first polarity and a second-second magnet  352   b  having the second polarity. The second-first magnet  352   a  and the second-second magnet  352   b  may be arranged side by side in the second direction. That is, the second-second magnet  352   b  may be disposed below the second-first magnet  352   a  and may be adjacent to the lower part  210  of the first housing  200 . 
     Also, the fifth magnet  355  may include a fifth-first magnet  355   a  having the second polarity and a fifth-second magnet  355   b  having the first polarity. The fifth-first magnet  355   a  and the fifth-second magnet  355   b  may be arranged side by side in the second direction. That is, the fifth-second magnet  355   b  may be disposed below the fifth-first magnet  355   a  and may be adjacent to the lower part  210  of the first housing  200 . In addition, the fifth-first magnet  355   a  may be disposed in a region overlapping the first-first magnet  351   a  in the first direction, and the fifth-second magnet  355   b  may be disposed in a region overlapping the first-second magnet  351   b  in the first direction. 
     Also, the sixth magnet  356  may include a sixth-first magnet  356   a  having the second polarity and a sixth-second magnet  356   b  having the first polarity. The sixth-first magnet  356   a  and the sixth-second magnet  356   b  may be arranged side by side in the second direction. That is, the sixth-second magnet  356   b  may be disposed below the sixth-first magnet  356   a  and may be adjacent to the lower part  210  of the first housing  200 . In addition, the sixth-first magnet  356   a  may be disposed in a region overlapping the second-first magnet  352   a  in the first direction, and the sixth-second magnet  356   b  may be disposed in a region overlapping the second-second magnet  352   b  in the first direction. 
     The first sensing unit  371  may be disposed on a region between the first-first magnet  351   a  and the first-second magnet  351   b . For example, the first sensing unit  371  may be disposed on a region overlapping the boundary between the first-first magnet  351   a  and the first-second magnet  351   b  in the first direction. A boundary between the first-first magnet  351   a  and the first-second magnet  351   b  may overlap a center of the first magnet  351  in a second direction (y-axis direction). 
     That is, the first sensing unit  371  may be disposed on a region overlapping the center of the first magnet  351 . Accordingly, when the prism unit  400  is tilted by the first driving unit  301 , the first sensing unit  371  can effectively sense the amount of rotation of the first magnet  351 , so that the position is more can be sensed accurately. 
       FIGS.  13  to  15    are views for explaining a second driving unit of the first camera actuator according to an embodiment. 
       FIGS.  13  to  15   , the base member  500  may be disposed under the first housing  200 . The second driving unit  302  may be disposed on the base member  500 . The base member  500  may be disposed to face the lower part  210  of the first housing  200 . The base member  500  has a plate shape and may support a part of the second driving unit  302 . 
     The second driving unit  302  may include a second piezoelectric device  320 , a third yoke  333 , and a third magnet  353 . 
     The second piezoelectric device  320  may be disposed on the base member  500 . The second piezoelectric device  320  may be disposed between the base member  500  and the first housing  200 . In detail, the second piezoelectric device  320  may be disposed between the upper surface of the base member  500  and the lower part  210  of the first housing  200 . The second piezoelectric device  320  may be disposed in a region corresponding to the center of the prism unit  400  in the second direction (y-axis direction). In detail, the second piezoelectric device  320  may be disposed in a region overlapping the center of the prism  410  in the second direction. The second piezoelectric device  320  may directly contact the housing  200 . 
     The second piezoelectric device  320  may include a piezo-electric device. The second piezoelectric device  320  may include a ceramic material. For example, the second piezoelectric device  320  may include may include at least one of ZnO, AlN, LiNbO4, lead antimony stannate, lead magnesium tantalate, lead nickel tantalate, titanates, tungstates, zirconates, or lead zirconate titanates [Pb(ZrxTi1−x)O3(PZT)], lead lanthanum zirconate titanate (PLZT), lead niobium zirconate titanate (PNZT), BaTiO3, SrTiO3, lead magnesium niobate, lead nickel niobate, lead manganese niobate, lead zinc niobate, lead, barium and bismuth, including lead titanate, and niobates of strontium. 
     The second piezoelectric device  320  may control the tilt of the housing  200 . The second piezoelectric device  320  may have a cylindrical shape. The second piezoelectric device  320  may cause mechanical deformation by an applied power. For example, the upper surface of the second piezoelectric device  320  facing the lower part  210  of the first housing  200  may be deformed into a wave shape by the applied power. 
     In detail, the second piezoelectric device  320  may include a plurality of second piezoelectric parts (not shown). The plurality of second piezoelectric parts may be disposed along a circumference of a concentric circle shape from a center of the second piezoelectric device  320  in the second direction. 
     The plurality of second piezoelectric parts may include a plurality of second-first piezoelectric parts spaced apart from each other and a second-second piezoelectric part disposed between the plurality of second-first piezoelectric parts. At this time, the upper surface of the second piezoelectric device  320  may be deformed into a continuous wave shape by a difference in power applied to each of the plurality of second-first piezoelectric parts and the plurality of second-second piezoelectric parts, and, a frictional force may be generated between the second piezoelectric device  320  and the lower part  210  of the first housing  200  due to the deformation. That is, the first housing  200  may be tilted in the left and right direction (x-axis direction) by the friction force between the second piezoelectric device  320  and the lower part  210 . 
     In addition, the second piezoelectric device  320  may further include a second guide hole  321 . For example, the lower part  210  of the first housing  200  may include a second guide protrusion  270  protruding toward the base member  500 . In this case, the second guide protrusion  270  may be disposed in a region overlapping the center of the prism unit  400  in the second direction (y-axis direction). In detail, the second guide protrusion  270  may be disposed in a region overlapping the center of the prism  410  in the second direction. The second guide hole  321  may be disposed in a region corresponding to the second guide protrusion  270 . The second guide hole  321  may be a through hole or a concave groove in the second direction. When the second piezoelectric device  320  includes the second guide hole  321 , the second piezoelectric device  320  may have a donut shape. 
     The second guide hole  321  may have a shape corresponding to that of the second guide protrusion  270 , and some or all of the second guide protrusion  270  may be inserted in the second guide hole  321 . 
     Accordingly, the second piezoelectric device  320  may have a position set by the second guide protrusion  270 . In addition, it is possible to prevent the second piezoelectric device  320  from being separated from the set rotation axis, in the process in which the first housing  200  is tilted in the left and right direction (x-axis direction) by the second guide protrusion  270  and the second guide hole  321 . 
     The third yoke  333  may be disposed on the first housing  200 . The third yoke  333  may be disposed in the second accommodation space  255 . The third yoke  333  may be disposed on the lower part  210 . 
     Also, the third yoke  333  may be disposed in a region that does not correspond to the second piezoelectric device  320 . For example, the third yoke  333  may be disposed in a region that does not overlap the second piezoelectric device  320  in the second direction. 
     The third magnet  353  may be disposed under the first housing  200 . The third magnet  353  may be disposed between the first housing  200  and the base member  500 . The third magnet  353  may be fixed on the upper surface of the base member  500 . 
     The third magnet  353  may be spaced apart from the second piezoelectric device  320 . The third magnet  353  may be disposed in a region that does not correspond to the second piezoelectric device  320 . The third magnet  353  may be disposed in a region that does not overlap the second piezoelectric device  320  in the second direction. Also, the third magnet  353  may be disposed in a region corresponding to the third yoke  333 . In detail, the third magnet  353  may be disposed in a region overlapping the third yoke  333  in the second direction. 
     The third yoke  333  and the third magnet  353  may arrange the first housing  200  at a set position. For example, a magnetic attraction may be generated between the third yoke  333  and the third magnet  353 . The first housing  200  may be pressed toward the base member  500  by the magnetic attraction. Accordingly, the first housing  200  may be disposed at a position overlapping the center of the second piezoelectric device  320  in the second direction without a separate fixing member. 
     Also, the third yoke  333  and the third magnet  353  may be spaced apart from the first driving unit  301 . In detail, the third yoke  333  and the third magnet  353  may be disposed in a region that does not overlap with the first yoke  331  and the second yoke  332  and the first magnet  351  and the second magnet  352  in the second direction (y-axis direction). Accordingly, when the first driving unit  301  is driven or the second driving unit  302  is driven, it is possible to prevent the driving force from being changed by other driving units, for example, due to the interference of the yokes and magnets of other driving units. 
     In addition, the second driving unit  302  may further include a fourth yoke  334  and a fourth magnet  354 . 
     The fourth yoke  334  may be disposed on the first housing  200 . The fourth yoke  334  may be disposed in the second accommodation space  255 . The fourth yoke  334  may be disposed on the lower part  210 . The fourth yoke  334  may be spaced apart from the third yoke  333 . For example, the fourth yoke  334  may be spaced apart from the third yoke  333  in the optical axis (z-axis direction). The fourth yoke  334  may be positioned closer to a second camera actuator  2000  to be described later than the third yoke  333 . 
     Also, the fourth yoke  334  may be disposed in a region that does not correspond to the second piezoelectric device  320 . For example, the fourth yoke  334  may be disposed in a region that does not overlap the second piezoelectric device  320  in the second direction. The second piezoelectric device  320  may be disposed between the third yoke  333  and the fourth yoke  334 . 
     The fourth magnet  354  may be disposed under the first housing  200 . The fourth magnet  354  may be disposed between the first housing  200  and the base member  500 . The fourth magnet  354  may be fixed on the upper surface of the base member  500 . The fourth magnet  354  may be spaced apart from the third magnet  353 . For example, the fourth magnet  354  may be spaced apart from the third magnet  353  in the optical axis (z-axis direction). The fourth magnet  354  may be disposed closer to a second camera actuator  2000  to be described later than the fourth magnet  354 . 
     The fourth magnet  354  may be spaced apart from the second piezoelectric device  320 . The fourth magnet  354  may be disposed in a region that does not correspond to the second piezoelectric device  320 . The fourth magnet  354  may be disposed in a region that does not overlap the second piezoelectric device  320  in the second direction. Also, the fourth magnet  354  may be disposed in a region corresponding to the fourth yoke  334 . In detail, the fourth magnet  354  may be disposed in a region overlapping the fourth yoke  334  in the second direction. 
     The fourth yoke  334  and the fourth magnet  354  may arrange the first housing  200  at a set position. For example, a magnetic attraction may be generated between the fourth yoke  334  and the fourth magnet  354 . The first housing  200  may be pressed toward the base member  500  by the magnetic attraction. Accordingly, the first housing  200  may be disposed at a position overlapping the center of the second piezoelectric device  320  in the second direction without a separate fixing member. 
     In addition, the fourth yoke  334  and the fourth magnet  354  may be spaced apart from the first driving unit  301 . In detail, the fourth yoke  334  and the fourth magnet  354  may be disposed in a region that does not overlap with the first yoke  331  and the second yoke  332 , the first magnet  351  and the second magnet  352  in the second direction (y-axis direction). Accordingly, when the first driving unit  301  is driven or the second driving unit  302  is driven, it is possible to prevent the driving force from being changed by other driving units, for example, due to the interference of the yokes and magnets of other driving units. 
     That is, the first camera actuator  1000  may include third and fourth yokes  333  and  334 , and third and fourth magnets  353 ,  354  disposed on the first housing  200  and the base member  500 . At this time, each of the third and fourth yokes  333  and  334  and the third and fourth magnets  353  and  354  may be disposed side by side in the optical axis (z-axis direction) and may be disposed in a region surrounding the second piezoelectric device  320 . Accordingly, the first housing  200  may be more stably disposed on the base member  500  and more stably tilted by the driving force of the second piezoelectric device  320 . In addition, the first camera actuator  1000  according to the embodiment may have improved reliability and optical characteristics. 
     The second driving unit  302  may include a second sensing unit  372 . The second sensing unit  372  may be disposed on one side of the partition wall  250 . The first sensing unit  371  may be disposed in a region corresponding to at least one of the third magnet  353  and the fourth magnet  354  in the second direction. The second sensing unit  372  may include a hall sensor. For example, the second sensing unit  372  may sense the position of the third magnet  353 . That is, the second sensing unit  372  may sense the position of the first housing  200 . 
       FIG.  16    is a view for explaining an arrangement relationship of a second driving unit of a first camera actuator according to an embodiment. 
     Referring to  FIG.  16   , the third yoke  333  may have a shape extending in the first direction (x-axis direction). A length in the first direction of the third yoke  333  may be longer than a length in the third direction (z-axis direction). 
     The third magnet  353  may be disposed in a region corresponding to the third yoke  333  in the second direction. The third magnet  353  may have a shape extending in the first direction (y-axis direction). A length in the first direction of the third magnet  353  may be longer than a length in the third direction. 
     The third magnet  353  may include a third-first magnet  353   a  having the first polarity and a third-second magnet  353   b  having the second polarity. The third-first magnet  353   a  and the third-second magnet  353   b  may be disposed side by side in a third direction. The third-second magnet  353   b  may be disposed closer to the second piezoelectric device  320  than the third-first magnet  353   a.    
     Also, the fourth yoke  334  may be spaced apart from the third yoke  333  in a third direction. The fourth yoke  334  may have a shape extending in the first direction (x-axis direction). A length in the first direction of the fourth yoke  334  may be longer than a length in the third direction. 
     The fourth magnet  354  may be disposed in a region corresponding to the fourth yoke  334  in the second direction. The fourth magnet  354  may be spaced apart from the third magnet  353  in a third direction. The fourth magnet  354  may have a shape extending in the first direction (x-axis direction). A length in the first direction of the fourth magnet  354  may be longer than a length in the third direction. 
     The fourth magnet  354  may include a fourth-first magnet  354   a  having the first polarity and a fourth-second magnet  354   b  having the second polarity. The fourth-first magnet  354   a  and the fourth-second magnet  354   b  may be disposed side by side in a third direction. The fourth-first magnet  354   a  may be disposed closer to the second piezoelectric device  320  than the fourth-second magnet  354   b.    
     The second sensing unit  372  may be disposed on a region between the third-first magnet  353   a  and the third-second magnet  353   b . For example, the second sensing unit  372  may be disposed on a region overlapping the boundary between the third-first magnet  353   a  and the third-second magnet  353   b  in the second direction. 
       FIGS.  17  to  19    are views for explaining another arrangement relationship of the second driving unit according to the embodiment. In the description using  FIGS.  17  to  19   , descriptions of the same and similar components as those of the first camera actuator described above are omitted, and the same reference numerals are assigned to the same and similar components. 
     Referring to  FIG.  17   , the third magnet  353  may be disposed in a region corresponding to the third yoke  333  in the second direction. The third magnet  353  may have a shape extending in the first direction (y-axis direction). A length in the first direction of the third magnet  353  may be longer than a length in the third direction. 
     The third magnet  353  may include a third-first magnet  353   a  having the first polarity and a third-second magnet  353   b  having the second polarity. The third-first magnet  353   a  and the third-second magnet  353   b  may be arranged in parallel in a first direction (x-axis direction). That is, the third-first magnet  353   a  and the third-second magnet  353   b  may be disposed at the same distance as the second piezoelectric device  320 . 
     Also, the fourth magnet  354  may be disposed in a region corresponding to the fourth yoke  334  in the second direction. The fourth magnet  354  may be spaced apart from the third magnet  353  in a third direction. The fourth magnet  354  may have a shape extending in the first direction (x-axis direction). A length in the first direction of the fourth magnet  354  may be longer than a length in the third direction. 
     The fourth magnet  354  may include a fourth-first magnet  354   a  having the first polarity and a fourth-second magnet  354   b  having the second polarity. The fourth-first magnet  354   a  and the fourth-second magnet  354   b  may be arranged side by side in the first direction. That is, the fourth-first magnet  354   a  and the fourth-second magnet  354   b  may be disposed at the same distance as the second piezoelectric device  320 . 
     The second sensing unit  372  may be disposed on a region between the third-first magnet  353   a  and the third-second magnet  353   b . For example, the second sensing unit  372  may be disposed on a region overlapping the boundary between the third-first magnet  353   a  and the third-second magnet  353   b  in the second direction. A boundary of the third-first magnet  353   a  and the third-second magnet  353   b  may overlap a center of the third magnet  353  in a first direction (x-axis direction). 
     That is, the second sensing unit  372  may be disposed on a region overlapping the center of the third magnet  353 . Accordingly, when the first housing  200  is tilted by the second driving unit  302 , the second sensing unit  372  can effectively sense the amount of rotation of the third magnet  353  to more accurately sense determine the position. 
     Referring to  FIG.  18   , the second driving unit  302  may include a seventh magnet  357  and an eighth magnet  358  instead of the third yoke  333  and the fourth yoke  334 . 
     The seventh magnet  357  may be disposed in the second accommodation space  255 . The seventh magnet  357  may be disposed on the lower part  210 . The seventh magnet  357  may be disposed in a region that does not overlap the second piezoelectric device  320  in the second direction. 
     The seventh magnet  357  may be disposed in a region corresponding to the third magnet  353  in the second direction. The seventh magnet  357  may have a shape extending in the first direction (x-axis direction). A length in the first direction of the seventh magnet  357  may be longer than a length in the third direction. 
     The seventh magnet may include a seventh-first magnet  357   a  having the second polarity and a seventh-second magnet  357   b  having the first polarity. The seventh-first magnet  357   a  and the seventh-second magnet  357   b  may be disposed side by side in a third direction. The seventh-first magnet  357   a  may be disposed in a region overlapping the third-first magnet  353   a  in the second direction, and the seventh-second magnet  357   b  may be disposed in a region overlapping the third-second magnet  353   b  in the second direction. 
     The third magnet  353  and the seventh magnet  357  may arrange the first housing  200  at a set position. For example, a magnetic attraction may be generated between the third-first magnet  353   a  and the seventh-first magnet  357   a  and between the third-second magnet  353   b  and the seventh-second magnet  357   b , and the first housing  200  may be pressed in the direction toward of the base member  500  by the magnetic attraction. Accordingly, the first housing  200  may be disposed at a position overlapping the center of the second piezoelectric device  320  in the second direction without a separate fixing member. 
     Also, the eighth magnet  358  may be disposed in the second accommodation space  255 . The eighth magnet  358  may be disposed on the lower part  210 . The eighth magnet  358  may be spaced apart from the seventh magnet  357 . For example, the eighth magnet  358  may be spaced apart from the seventh magnet  357  in the optical axis (z-axis direction). Also, the eighth magnet  358  may be disposed in a region that does not overlap the second piezoelectric device  320  in the second direction. The second piezoelectric device  320  may be disposed between the seventh magnet  357  and the eighth magnet  358 . 
     The eighth magnet  358  may be disposed in a region corresponding to the fourth magnet  354  in the second direction. The eighth magnet  358  may have a shape extending in the first direction (x-axis direction). A length in the first direction of the eighth magnet  358  may be longer than a length in the third direction. 
     The eighth magnet  358  may include an eighth-first magnet  358   a  having the second polarity and an eighth-second magnet  358   b  having the first polarity. The eighth-first magnet  358   a  and the eighth-second magnet  358   b  may be disposed side by side in a third direction. The eighth-first magnet  358   a  may be disposed in a region overlapping with the fourth-first magnet  354   a  in the second direction, and the eighth-second magnet  358   b  may be disposed in a region overlapping with the fourth-second magnet  354   b  in the second direction. 
     The fourth magnet  354  and the eighth magnet  358  may arrange the first housing  200  at a set position. For example, a magnetic attraction may be generated between the fourth-first magnet  354   a  and the eighth-first magnet  358   a  and between the fourth-second magnet  354   b  and the eighth-second magnet  358   b , and the first housing  200  may be pressed in the direction toward of the base member  500  by the magnetic attraction. Accordingly, the first housing  200  may be disposed at a position overlapping the center of the second piezoelectric device  320  in the second direction without a separate fixing member. 
     The second sensing unit  372  may be disposed on a region between the third-first magnet  353   a  and the third-second magnet  353   b . For example, the second sensing unit  372  may be disposed on a region overlapping the boundary between the third-first magnet  353   a  and the third-second magnet  353   b  in the second direction. 
     That is, the first camera actuator  1000  may include a plurality of magnets  353 ,  354 ,  357 , and  358  disposed inside and below the first housing  200 . In this case, the plurality of magnets  353 ,  354 ,  357 , and  358  may be disposed in a region surrounding the second piezoelectric device  320 . Accordingly, the first housing  200  may be more stably disposed on the base member  500  and more stably tilted by the driving force of the second piezoelectric device  320 . 
     Also, referring to  FIG.  19   , the third magnet  353  may include a third-first magnet  353   a  having the first polarity and a third-second magnet  353   b  having the second polarity. The third-first magnet  353   a  and the third-second magnet  353   b  may be arranged in parallel in a first direction (x-axis direction). 
     Also, the fourth magnet  354  may include a fourth-first magnet  354   a  having the first polarity and a fourth-second magnet  354   b  having the second polarity. The fourth-first magnet  354   a  and the fourth-second magnet  354   b  may be arranged side by side in the first direction. 
     In addition, the seventh magnet  357  may include a seventh-first magnet  357   a  having the second polarity and a seventh-second magnet  357   b  having the first polarity. The seventh-first magnet  357   a  and the seventh-second magnet  357   b  may be arranged side by side in the first direction. In addition, the seventh-first magnet  357   a  may be disposed in a region overlapping the third-first magnet  353   a  in the second direction, and the seventh-second magnet  357   b  may be disposed in a region overlapping the third-second magnet  353   b  in the second direction. 
     Also, the eighth magnet  358  may include an eighth-first magnet  358   a  having the second polarity and an eighth-second magnet  358   b  having the first polarity. The eighth-first magnet  358   a  and the eighth-second magnet  358   b  may be arranged side by side in the first direction. In addition, the eighth-first magnet  358   a  may be disposed in a region overlapping the fourth-first magnet  354   a  in the second direction, and the eighth-second magnet  358   b  may be disposed in a region overlapping the fourth-second magnet  354   b  in the second direction. 
     The second sensing unit  372  may be disposed on a region between the third-first magnet  353   a  and the third-second magnet  353   b . For example, the second sensing unit  372  may be disposed on a region overlapping the boundary between the third-first magnet  353   a  and the third-second magnet  353   b  in the second direction. A boundary between the third-first magnet  353   a  and the third-second magnet  353   b  may overlap a center of the third magnet  353  in a second direction (y-axis direction). 
     That is, the second sensing unit  372  may be disposed on a region overlapping the center of the third magnet  353 . Accordingly, when the first housing  200  is tilted by the second driving unit  302 , the second sensing unit  372  can effectively sense the amount of rotation of the third magnet  353  to more accurately sense the position. 
       FIG.  20    is another exploded perspective view of the first camera actuator according to the embodiment. Also,  FIG.  21    is an exploded perspective view of the prism unit of the first camera actuator according to  FIG.  20   , and  FIG.  22    is a perspective view of the prism unit of the first camera actuator according to  FIG.  20   . 
     In the description using  FIGS.  20  to  22   , descriptions of the same and similar components as those of the first camera actuator described above are omitted, and the same reference numerals are assigned to the same and similar components. 
     Referring to  FIGS.  20  to  22   , the first camera actuator  1000  according to the embodiment may include a cover member  100 , a first housing  200 , a prism unit  400 , a first driving unit  301 , a second driving unit.  302 , a base member  500 . 
     The first housing  200  may have a structure in which a plurality of side surfaces are opened. For example, the first housing  200  may include a lower part  210 , a first side part  221 , a second side part  222 , and an upper part  230 . 
     The first housing  200  may include a plurality of accommodation spaces. For example, the first housing  200  may include a first accommodating space  205  and a second accommodating space  255  separated by the partition wall  250 . 
     The first accommodation space  205  may be disposed between the partition wall  250  and the second side part  222 . The prism unit  400  may be disposed in the first accommodation space  205 . In addition, the second accommodation space  255  may be disposed between the partition wall  250  and the first side part  221 . A part of the configuration of the first driving unit  301  may be disposed in the second accommodation space  255 . 
     The prism unit  400  may include a prism  410  and a prism mover  430  disposed on the prism  410 . 
     The prism  410  may reflect the direction of the light incident from the outside. That is, the prism  410  may change the path of the light incident on the first camera actuator  1000  from the outside toward the second camera actuator  2000  to be described later. 
     The prism mover  430  may accommodate the prism  410 . In addition, the prism mover  430  may include a plurality of outer surfaces. The prism mover  430  may include a first outer surface  430 S 1  facing the partition wall  250  and a second outer surface  430 S 2  facing the second partition wall  250 . In addition, the prism mover  430  may include a third outer surface  430 S 3  facing the lower part  210  and a fourth outer surface  430 S 4  disposed between the first to third outer surfaces  430 S 1 ,  430 S 2 , and  430 S 3 , and the surfaces  430 S 1  and connecting the surfaces  430 S 1 ,  430 S 2  and  430 S 3  to each other. 
     The prism mover  430  may include at least one recess. For example, the prism mover  430  may include a first recess  430 R 1  disposed on the first outer surface  430 S 1 . The first recess  430 R 1  may be disposed in a region overlapping the center of the prism unit  400  in the first direction (x-axis direction). The first recess  430 R 1  may have a concave groove shape in a direction from the first outer surface  430 S 1  to the second outer surface  430 S 2 . 
     The first recess  430 R 1  may be disposed in a region corresponding to the first guide protrusion  271 . In detail, the first recess  430 R 1  may be disposed in a region overlapping the first guide protrusion  271  in the first direction. The first recess  430 R 1  may have a shape corresponding to that of the first guide protrusion  271  and a depth corresponding to that of the first guide protrusion  271 . The first recess  430 R 1  may provide a space in which the first guide protrusion  271  is inserted. The prism unit  400  may be tilted in the vertical direction (y-axis direction) using the first guide protrusion  271  as a rotation axis. 
     Also, the prism mover  430  may include a second recess  430 R 2 . The second recess  430 R 2  may be disposed on the second outer surface  430 S 2 . The second recess  430 R 2  may be disposed in a region overlapping the center of the prism unit  400  in the first direction (x-axis direction). The second recess  430 R 2  may have a concave groove shape in a direction from the second outer surface  430 S 2  to the first outer surface  430 S 1 . 
     The second recess  430 R 2  may be disposed in a region corresponding to the first recess  430 R 1  and the first guide protrusion  271 . The second recess  430 R 2  may be disposed in a region overlapping the first recess  430 R 1  in the first direction. The second recess  430 R 2  may provide a space in which an end of the first elastic member  610 , which will be described later, is inserted. 
       FIG.  23    is a front view of the first camera actuator according to  FIG.  20   , and  FIGS.  24  and  25    are views for explaining the arrangement relationship of the first driving unit of the first camera actuator according to  FIG.  20   . 
     Referring to  FIGS.  23  to  25   , the first driving unit  301  may be disposed in the first housing  200 . The first driving unit  301  may be disposed adjacent to the prism unit  400 . 
     The first driving unit  301  may include a first piezoelectric device  310  and a first elastic member  610 . 
     The first piezoelectric device  310  may be disposed in the first accommodation space  205 . The first piezoelectric device  310  may be disposed between the prism unit  400  and the partition wall  250 . The first piezoelectric device  310  may be disposed on a region corresponding to the first guide protrusion  271  and the first recess  430 R 1 . The first piezoelectric device  310  may be disposed in a region corresponding to the center of the prism unit  400  in the first direction. The first piezoelectric device  310  may be disposed in direct contact with the first outer surface  430 S 1 . 
     The first elastic member  610  may be disposed in the first housing  200 . The first elastic member  610  may be disposed on a region that does not obstruct the path of the light incident on the first camera actuator  1000 . For example, the first elastic member  610  may be disposed on the first side part  221  of the first housing  200 . The first elastic member  610  may extend in a first direction (x-axis direction) from the first side part  221  and may be bent in a region corresponding to the second outer surface  430 S 2  to extend in the third direction (z-axis direction). The first elastic member  610  may be spaced apart from the fourth outer surface  430 S 4  of the prism unit  400  and may be disposed in contact with the second outer surface  430 S 2 . In addition, an end of the first elastic member  610  may be disposed to be inserted into the second recess  430 R 2 . An end of the first elastic member  610  may be disposed in a region overlapping the first guide protrusion  271  in the first direction. 
     The first elastic member  610  may include an elastically deformable material. For example, the first elastic member  610  may include a leaf spring. 
     The first elastic member  610  may press the prism unit  400  in the direction toward of the first piezoelectric device  310 . That is, the first elastic member  610  may press the prism unit  400  in the direction of toward the first side part  211 . The first elastic member  610  may connect and support the prism unit  400  tilted in the vertical direction (y-axis direction) by the first piezoelectric device  310  with the first piezoelectric device  310 . 
     The prism unit  400  may have a set position. In detail, the first guide protrusion  271  may be disposed by being inserted into the first piezoelectric device  310  and the first outer surface  430 S 1  of the prism unit  400 . A first elastic member  610  for pressing in the direction toward of the partition wall  250  may be disposed on the second outer surface  430 S 2 . 
     Accordingly, the prism unit  400  may be disposed at a set position in the first housing  200 , and the first driving unit  301  may omit the above-described first yoke  331 , second yoke  332 , the first magnet  351  and the second magnet  352 . 
     Accordingly, the first camera actuator  1000  may have a simpler structure and may be implemented in a smaller size. In addition, in the process in which the prism unit  400  is tilted in the vertical direction (y-axis direction), it is possible to prevent the configuration of at least one of the prism unit  400  and the first piezoelectric device  310  from being separated from the rotation axis. 
       FIGS.  26  to  28    are views for explaining the arrangement relationship of the second driving unit of the first camera actuator according to  FIG.  20   . 
     Referring to  FIGS.  26  to  28   , the second driving unit  302  may be disposed on the base member  500 . The second driving unit  302  may be disposed adjacent to the first housing  200 . 
     The second driving unit  302  may include a second piezoelectric device  320 , a second elastic member  620 , and a third elastic member  630 . 
     The second piezoelectric device  320  may be disposed on the base member  500 . The second piezoelectric device  320  may be disposed between the base member  500  and the first housing  200 . In detail, the second piezoelectric device  320  may be disposed between the upper surface of the base member  500  and the lower part  210  of the first housing  200 . The second piezoelectric device  320  may be disposed in a region corresponding to the second guide protrusion. The second piezoelectric device  320  may be disposed in a region corresponding to the center of the prism unit  400  in the second direction (y-axis direction). The second piezoelectric device  320  may be disposed in a region overlapping the center of the prism  410  in the second direction. 
     The second elastic member  620  and the third elastic member  630  may be disposed on the base member  500 . The second elastic member  620  and the third elastic member  630  may be disposed on a region that does not obstruct the path of the light incident on the first camera actuator  1000 . 
     For example, the second elastic member  620  may be disposed at one end of the base member  500 . The second elastic member  620  may extend in the second direction (y-axis direction) from the upper surface of the base member  500 , and may be bent in a region corresponding to the upper part  230  of the first housing  200  to extend in the first direction (x-axis direction). In this case, the second elastic member  620  extending in the first and second directions may be spaced apart from the first housing  200 . In addition, the end of the second elastic member  620  extending in the first direction may be bent to extend in the third direction (z-axis direction), and may be in contact with the upper part  230  of the first housing  200 . 
     Also, the third elastic member  630  may be disposed at one end of the base member  500 . The second elastic member  620  may extend in the second direction (y-axis direction) from the upper surface of the base member  500 , and may be bent in a region corresponding to the upper part  230  of the first housing  200  to extend in the first direction (x-axis direction). In this case, the second elastic member  620  extending in the first and second directions may be spaced apart from the first housing  200 . In addition, the end of the second elastic member  620  extending in the first direction may be bent to extend in the third direction (z-axis direction), and may be in contact with the upper part  230  of the first housing  200 . 
     The second elastic member  620  and the third elastic member  630  may have a shape symmetrical to each other. In addition, the second elastic member  620  and the third elastic member  630  may be disposed in a symmetrical area with respect to the center of the prism unit  400 . 
     The second elastic member  620  and the third elastic member  630  may include an elastically deformable material. For example, the second elastic member  620  and the third elastic member  630  may include a leaf spring. The second and third elastic members  620  and  630  may press the first housing  200  toward the second piezoelectric device  320 . That is, the second and third elastic members  620  and  630  may press the first housing  200  in the direction toward of the base member  500 . The second and third elastic members  620  and  630  may support and connect the first housing  200  tilted in the left and right direction (x-axis direction) by the second piezoelectric device  320  with the second piezoelectric device  320 . 
     The first housing  200  may have a set position. In detail, the second guide protrusion  270  may be disposed to be inserted into the second guide hole  321  of the second piezoelectric device  320 , and a second elastic member  620  and a third elastic member  630  for pressing in the direction of the base member  500  may be disposed on the upper part  230  of the first housing  200 . 
     Accordingly, the first housing  200  may be disposed at a position set on the base member  500 , and the second driving unit  302  may omit the above-described third yoke  333 , the fourth yoke  334 , the third magnet  353  and the fourth magnet  354 . 
     Accordingly, the first camera actuator  1000  may have a simpler structure and may be implemented in a smaller size. In addition, it is possible to prevent the configuration of at least one of the first housing  200  and the second piezoelectric device  320  from being separated from the rotation shaft, in the process in which the first housing  200  is tilted in the vertical direction (y-axis direction). 
       FIG.  29    is a perspective view of a camera module according to an embodiment, and  FIG.  30    is a perspective view in which some components are omitted from the camera module according to the embodiment. 
     Referring to  FIGS.  29  and  30   , the camera module  10  according to the embodiment may include one or a plurality of camera actuators. For example, the camera module  10  may include the first camera actuator  1000  and the second camera actuator  2000  described above, and a cover case  15  for protecting the first camera actuator  1000  and the second camera actuator  2000 . 
     The first camera actuator  1000  may be an optical image stabilizer (OIS) actuator. In this case, the light incident on the camera module  10  from the outside may first be incident on the first camera actuator  1000 . Also, the light incident on the first camera actuator  1000  may be incident on the second camera actuator  2000  by changing a path of the light. Subsequently, the light passing through the second camera actuator  2000  may be incident on the image sensor  2900 . 
     The second camera actuator  2000  may be a zoom and/or auto focus actuator. The second camera actuator  2000  may include a plurality of lenses. The second camera actuator  2000  may perform a zoom or autofocus function by moving at least one lens in the optical axis direction according to a control signal of the controller. The second camera actuator  2000  will be described in more detail with reference to the drawings to be described later. 
       FIG.  31    is an exploded perspective view of a second camera actuator according to an embodiment,  FIG.  32    is a cross-sectional view of a second camera actuator according to an embodiment,  FIG.  33    is a front view of a second camera actuator according to an embodiment,  FIG.  34    is a perspective view illustrating third and fourth driving units disposed in a first housing of a second camera actuator according to an embodiment,  FIG.  35    is an exploded perspective view of a third driving unit according to an embodiment,  FIG.  36    is an exploded perspective view of a fourth driving unit according to the embodiment, and  FIG.  37    is a perspective view of a partial configuration of the second camera actuator according to the embodiment. 
     Referring to  FIGS.  31  to  37   , the second camera actuator  2000  according to the embodiment may include a second housing  2100 , a first lens unit  2105 , a first lens barrel  2200 , a third driving unit  2300 , a second lens barrel  2400 , and a fourth driving unit  2500 . 
     The second housing  2100  may form an exterior of the second camera actuator  2000 . The second housing  2100  may have upper and lower partial regions open and may have a hexahedral shape. 
     The second housing  2100  may include an accommodating space therein. The first lens barrel  2200 , the third driving unit  2300 , the second lens barrel  2400 , and the fourth driving unit  2500  may be accommodated in the accommodating space of the second housing  2100 . 
     The second housing  2100  may include a first sub-housing  2110  and a second sub-housing  2120 . 
     The first sub-housing  2110  may include a first hole  2111 . The first hole  2111  may be formed on one side of the first sub-housing  2110 . The first hole  2111  is a hollow hole and may be a hole passing through outside and inside of the first sub-housing  2110 . 
     The first sub-housing  2110  may further include a second hole  2112  and a third hole  2113 . The second hole  2112  and the third hole  2113  may be disposed on one side of the first sub-housing  2110 . The second hole  2112  and the third hole  2113  may be hollow holes passing through the outside and the inside of the first sub-housing  2110 . The second hole  2112  and the third hole  2113  may be spaced apart from the first hole  2111 . In detail, the first hole  2111  may be disposed between the second hole  2112  and the third hole  2113 . The first hole  2111  may be disposed at equal intervals to the second hole  2112  and the third hole  2113 . 
     The second hole  2112  may include a plurality of protrusions protruding from an inner circumferential surface of the second hole  2112  toward the center of the second hole  2112 . For example, the plurality of protrusions may include a first protrusion  2112   a  disposed at an upper end of the second hole  2112  and a second protrusion  2112   b  disposed at a lower end of the second hole  2112  in the optical axis direction. 
     In detail, the first protrusion  2112   a  may include a plurality of first sub-protrusions (not shown) spaced apart from each other. The plurality of first sub-protrusions may be arranged at equal intervals from the center of the second hole  2112  along a circumference of a concentric circle shape. Also, the second protrusion  2112   b  may be spaced apart from the first protrusion  2112   a  in the optical axis direction. The second protrusion  2112   b  may be disposed below the first protrusion  2112   a . The second protrusion  2112   b  may include a plurality of second sub-protrusions (not shown) spaced apart from each other. The plurality of second sub-protrusions may be arranged at equal intervals from the center of the second hole  2112  along a circumference of a concentric circle shape. The first protrusion  2112   a  and the second protrusion  2112   b  may provide a space in which a portion of the third driving unit  2300  to be described later, for example, the first buffer member  2321  is disposed. 
     The third hole  2113  may include a plurality of protrusions protruding from an inner circumferential surface of the third hole  2113  toward the center of the third hole  2113 . The plurality of protrusions may include a third protrusion  2113   a  disposed at an upper end of the third hole  2113  and a fourth protrusion  2113   b  disposed at a lower end of the second hole  2112  with respect to the optical axis direction. 
     The third protrusion  2113   a  may include a plurality of third sub-protrusions (not shown) spaced apart from each other. The plurality of third sub-protrusions may be arranged at equal intervals from the center of the third hole  2113  along a circumference of a concentric circle shape. Also, the fourth protrusion  2113   b  may be spaced apart from the third protrusion  2113   a  in the optical axis direction. The fourth protrusion  2113   b  may include a plurality of fourth sub-protrusions (not shown) spaced apart from each other. The plurality of fourth sub-protrusions may be arranged at equal intervals from the center of the third hole  2113  along a circumference of a concentric circle shape. The third protrusion  2113   a  and the fourth protrusion  2113   b  may provide a space in which a portion of the fourth driving unit  2500  to be described later, for example, a third buffer member  2521  is disposed. 
     The second sub-housing  2120  may be disposed under the first sub-housing  2110 . In detail, the second sub-housing  2120  may be disposed under the first sub-housing  2110  in a third direction (z-axis, optical-axis direction). The second sub-housing  2120  may be disposed closer to an image sensor  2900  to be described later than the first sub-housing  2110 . The first lens barrel  2200 , the third driving unit  2300 , the second lens barrel  2400 , and the fourth driving unit  2500  may be disposed in the second sub-housing  2120 . 
     The second sub-housing  2120  may be coupled to the first sub-housing  2110 . For example, the first sub-housing  2110  and the second sub-housing  2120  may be coupled by a separate fastening member (not shown) such as a screw. In addition, the first sub-housing  2110  and the second sub-housing  2120  may be coupled to each other by physical coupling of coupling jaws and coupling grooves respectively formed therein. 
     The first lens unit  2105  may be disposed in the second housing  2100  and may include at least one lens. For example, the first lens unit  2105  may be disposed in the first sub-housing  2110 . In detail, the first lens unit  2105  may be disposed in the first hole  2111  of the first sub-housing  2110 . For example, the first lens unit  2105  may be coupled to the first sub-housing  2110  by a screw thread formed on an inner circumferential surface of the first hole  2111 . 
     The first lens barrel  2200  may be disposed in the second housing  2100 . The first lens barrel  2200  may be disposed in the second sub-housing  2120 . The first lens barrel  2200  may be disposed under the first lens unit  2105 . For example, the first lens barrel  2200  may be disposed below the first lens unit  2105  in the optical axis direction, and may be closer to the image sensor  2900  than the first lens unit  2105 . The first lens barrel  2200  may be coupled to the third driving unit  2300 . The first lens barrel  2200  may move in the second housing  2100  by the third driving unit  2300 . In detail, the first lens barrel  2200  may be moved in the optical axis direction by the third driving unit  2300 . 
     The first lens barrel  2200  may include a first barrel part  2210 , a second lens unit  2205 , a first guide part  2220 , and a first elastic part  2230 . 
     The first barrel part  2210  may be disposed in a region overlapping the optical axis and may have an open shape on one surface and the other surface. For example, the first barrel part  2210  may have a cylindrical shape in which one surface and the other surface are open. 
     The first barrel part  2210  may include the first through hole  2211 . The first through hole  2211  may be a through hole penetrating through one surface and the other surface of the first barrel part  2210 . Here, one surface of the first barrel part  2210  may be a surface facing the first lens unit  2105 , and the other surface may be a surface opposite to the one surface and facing the image sensor  2900 . 
     The second lens unit  2205  may be disposed on the first barrel part  2210 . In detail, the second lens unit  2205  may be disposed in the first through hole  2211 . For example, a screw line may be formed on an inner circumferential surface of the first through hole  2211 , and the second lens unit  2205  may be coupled to the first barrel part  2210  by the screw line. 
     The second lens unit  2205  may include at least one lens. The second lens unit  2205  may perform a zoom function. The second lens unit  2205  may move in the optical axis direction. In detail, the second lens unit  2205  may move in the optical axis direction with respect to the first lens unit  2105 . 
     The first guide part  2220  may extend outwardly from the first barrel part  2210 . For example, the first guide part  2220  may extend from the first barrel part  2210  in a direction perpendicular to the optical axis, for example, in a first direction (x-axis direction). 
     The first guide part  2220  may include a first upper surface  2221 , a first side surface  2222 , and a first lower surface  2223 . 
     The first upper surface  2221  may face an inner upper surface of the second housing  2100 . The first upper surface  2221  may face the inner upper surface of the second housing  2100  in the second direction (y-axis direction). The first upper surface  2221  may include a plurality of sub upper surfaces. In detail, the first upper surface  2221  may include a first sub upper surface  2221   a  and a second sub upper surface  2221   b  that is disposed lower than the first sub upper surface  2221   a  in a second direction (y-axis direction). That is, the second sub upper surface  2221   b  may be disposed adjacent to the first lower surface  2223  than the first sub upper surface  2221   a . At least one first fastening protrusion (not shown) may be disposed on the second sub upper surface  2221   b . The first fastening protrusion may have a shape protruding upward on the second sub upper surface  2221   b . The first fastening protrusion may be inserted into a first fixing groove (not shown) formed in a first elastic part  2230  to be described later. 
     Also, the first upper surface  2221  may include a first stepped surface  2225  disposed between the first sub upper surface  2221   a  and the second sub upper surface  2221   b . The first stepped surface  2225  may be connected to ends of the first sub upper surface  2221   a  and the second sub upper surface  2221   b . The first stepped surface  2225  may be defined as the first stepped portion  2225 . That is, the first upper surface  2221  may include the first sub upper surface  2221   a , the second sub upper surface  2221   b , and the first stepped portion  2225 , and may have a stepped structure. 
     The first lower surface  2223  may face an inner lower surface of the second housing  2100  to be described later. A first groove  223   h   1  may be disposed on the first lower surface  2223 . The first groove  223   h   1  may have a concave shape in a direction from the first lower surface  2223  to the first upper surface  2221 . A first magnetic scaler  2610 , which will be described later, may be disposed in the first groove  223   h   1 . 
     Also, a second groove  2223   h   2  may be disposed on the first lower surface  2223 . The second groove  2223   h   2  may be spaced apart from the first groove  223   h   1 . The second groove  2223   h   2  may be disposed in an edge region of the first lower surface  2223 . The second groove  2223   h   2  may provide a region in which a portion of the first elastic part  2230 , which will be described later, is disposed. In detail, the second groove  2223   h   2  may provide a region in which the first elastic part  2230  is mounted and fixed. 
     The first side surface  2222  may be disposed between the first upper surface  2221  and the first lower surface  2223 . In detail, the first side surface  2222  may be a surface connecting the first upper surface  2221  and the first lower surface  2223 . In more detail, the first side surface  2222  may be a surface connecting the second sub upper surface  2221   b  and the first lower surface  2223 . The first side surface  2222  may face a second inner surface of the second sub-housing  2120  to be described later. 
     A first recess  2222   h  may be disposed on the first side surface  2222 . The first recess  2222   h  may have a concave shape in a direction from the first side surface  2222  to the first barrel part  2210 . Also, the first recess  2222   h  may have a groove shape extending in the optical axis direction (z-axis direction). The first recess  2222   h  may have a V-shape when viewed from a front. 
     The first guide part  2220  may include a first insertion hole  2220   h   1 . The first insertion hole  2220   h   1  may be a hole passing through one surface and the other surface of the first guide part  2220 . Here, one surface of the first guide part  2220  may be a surface facing the first lens unit  2105 , and the other surface may be a surface opposite to the one surface and facing the image sensor  2900 . 
     A first pin  2250  may be disposed in the first insertion hole  2220   h   1 . The first pin  2250  may be disposed to pass through the first insertion hole  2220   h   1 . The first pin  2250  may have a shape extending in the optical axis direction (z-axis direction), and may have a length in the optical axis direction longer than that of the first lens barrel  2200 . The first pin  2250  may be coupled to at least one of the first sub-housing  2110  and the second sub-housing  2120 . The first lens barrel  2200  may move the first pin  2250  as a movement axis in the optical axis direction. Through this, the second lens unit  2205  disposed in the first lens barrel  2200  may perform a zoom function and/or an autofocus function. 
     The first elastic part  2230  may be disposed on the first guide part  2220 . For example, the first elastic part  2230  may be disposed on the first upper surface  2221 , the first lower surface  2223 , and the first side surface  2222  of the first guide part  2220 . The first elastic part  2230  may be coupled to the first guide part  2220 . 
     The first elastic part  2230  may include a first elastic member  2231  and a second elastic member  2232 . 
     The first elastic member  2231  may be coupled to the first guide part  2220 . The first elastic member  2231  may be disposed at a set position on the first side surface  2222 . 
     The first elastic member  2231  may have a shape corresponding to the first side surface  2222 . For example, the first elastic member  2231  may include a first region  2231   a , a second region  2231   b , and a third region  2231   c.    
     The first region  2231   a  and the second region  2231   b  may be disposed on the first side surface  2222  of the first guide part  2220  and may be spaced apart from each other. The first region  2231   a  and the second region  2231   b  may be disposed on a region of the first side surface  2222  in which the first recess  2222   h  is not disposed. 
     The third region  2231   c  may be disposed between the first region  2231   a  and the second region  2231   b  to connect the two regions  2231   a  and  2231   b . The third region  2231   c  may be disposed in a region corresponding to the first recess  2222   h . The third region  2231   c  may have a V-shape corresponding to the first recess  2222   h.    
     The second elastic member  2232  may be disposed on the first guide part  2220 . The second elastic member  2232  may be coupled to the first guide part  2220 . 
     The second elastic member  2232  may include a fourth region  2232   a , a fifth region  2232   b , and a sixth region  2232   c.    
     The fourth region  2232   a  may be disposed on the first upper surface  2221  of the first guide part  2220 . In detail, the fourth region  2232   a  may be disposed on the second sub upper surface  2221   b  of the first guide part  2220 . The fourth region may include a first fixing groove (not shown). The first fixing groove may be disposed in a region corresponding to the first fastening protrusion, and may have a shape corresponding to the first fastening protrusion. 
     The fifth region  2232   b  may be connected to the fourth region  2232   a . For example, the fifth region  2232   b  may be bent at one end of the fourth region  2232   a  and may be disposed on the first side surface  2222  of the first guide part  2220 . The fifth region  2232   b  may be disposed on the first elastic member  2231 . The fifth region  2232   b  may be parallel to the first region  2231   a  and the second region  2231   b . The fifth region  2232   b  may be disposed to cover the first elastic member  2231 . 
     The sixth region  2232   c  may be connected to the fifth region  2232   b . For example, the sixth region  2232   c  may be bent at one end of the fifth region  2232   b  and may be disposed on the first lower surface  2223  of the first guide part  2220 . A portion of the sixth region  2232   c  may be inserted into the second groove  2223   h   2  disposed on the first lower surface  2223 . 
     That is, the second elastic member  2232  may be physically coupled to the first guide part  2220  by inserting the sixth region  2232   c  into the second groove  2223   h   2  while the first fixing groove formed in the fourth region  2232   a  engages the first fastening protrusion. Accordingly, the first elastic part  2230  may maintain a state firmly coupled to the first guide part  2220 . 
     In addition, the first lens barrel  2200  may further include a first guide groove  2210   h   1 . The first guide groove  2210   h   1  may be disposed in a region extending outwardly from the first barrel part  2210 . The first guide groove  2210   h   1  may be disposed in a region corresponding to a second pin  2450  to be described later. The first guide groove  2210   h   1  may provide a space into which the second pin  2450  is inserted. The first lens barrel  2200  may move in the optical axis direction by the first pin  2250  and the second pin  2450 . In this case, the first guide groove  2210   h   1  may have an open shape at one side. For example, the first guide groove  2210   h   1  may have an open shape at one side facing the first inner surface of the second housing  2100 . Accordingly, friction and vibration generated when the first lens barrel  2200  is moved by the third driving unit  2300  may be minimized. 
     The second camera actuator  2000  may include a third driving unit  2300 . The third driving unit  2300  may be disposed in the second housing  2100 . The third driving unit  2300  may be coupled to the first lens barrel  2200 . The third driving unit  2300  may move the first lens barrel  2200  in the optical axis direction (z-axis direction). 
     The third driving unit  2300  may include a first piezoelectric device  2310 , a first extension bar  2320 , a first buffer member  2321 , and a second buffer member  2322 . 
     The first piezoelectric device  2310  may include a piezo-electric device. For example, the first piezoelectric device  2310  may include a material that causes mechanical deformation by applied power. The first piezoelectric device  2310  may contract or expand by applied power and may cause mechanical deformation in a set direction. For example, the first piezoelectric device  2310  may generate vibration while causing mechanical deformation in the optical axis direction (z-axis direction) by the applied power. 
     The first piezoelectric device  2310  may include a first disk part  2311  and a first protrusion  2512 . The first disk part  2311  may have a plate shape and may be disposed on the second hole  2112 . For example, the first disk part  2311  may be disposed on the first protrusion  2112   a  of the second hole  2112 . In detail, the first disk part  2311  may be disposed on the plurality of first sub-protrusions. The first protrusion  2112   a  may support the first disk part  2311 . 
     The first protrusion  2512  may be disposed under the first disk part  2311 . In detail, the first protrusion  2512  may be disposed under the first disc part  2311  in the third direction (z-axis direction) and may be connected to the first disc part  2311 . A portion of the first protrusion  2512  may be disposed in the second hole  2112 . The first protrusion  2512  may have a shape protruding toward the image sensor  2900 . A width (x-axis, y-axis direction) of the first protrusion  2512  may change toward the optical axis direction. For example, the width of the first protrusion  2512  may decrease as it approaches the image sensor  2900 . 
     The first extension bar  2320  may extend in the optical axis direction. The first extension bar  2320  may be disposed parallel to the optical axis and may be connected to the first piezoelectric device  2310 . For example, an upper end of the first extension bar  2320  may be connected to the first protrusion  2512 . In addition, a lower end of the first extension bar  2320  may be inserted into a lower end of the second housing  2100 , for example, a fourth hole (not shown) formed at the lower end of the second sub-housing  2120 . 
     In addition, one region of the first extension bar  2320  may be connected to the first lens barrel  2200 . For example, the first extension bar  2320  may be connected to the first lens barrel  2200  by the first elastic part  2230 . In detail, the first extension bar  2320  may be disposed between the first elastic member  2231  and the second elastic member  2232 . In more detail, the first extension bar  2320  may be disposed between the third region  2231   c  of the first elastic member  2231  and the fifth region  2232   b  of the second elastic member  2232 . The first extension bar  2320  may be fixed by the elastic force of the first elastic member  2231  and the second elastic member  2232 . 
     The first extension bar  2320  may transmit the vibration generated in the first piezoelectric device  2310  to the first lens barrel  2200 . The first lens barrel  2200  may move upward or downward (z-axis direction, optical-axis direction) according to the vibration direction of the first extension bar  2320 . Through this, the second lens unit  2205  in the first lens barrel  2200  may move to perform a zooming function of zooming up or zooming out. 
     The first buffer member  2321  may be disposed on the first extension bar  2320 . The first buffer member  2321  may be disposed on an upper region of the first extension bar  2320 . The first buffer member  2321  may be disposed in the second hole  2112  of the second housing  2100 . For example, the first buffer member  2321  may be disposed between the first protrusion  2112   a  and the second protrusion  2112   b  of the second hole  2112 . The first buffer member  2321  may be fixed to a position set by the first protrusion  2112   a  and the second protrusion  2112   b . In addition, the first buffer member  2321  may include a through hole into which the first extension bar  2320  is inserted. 
     The second buffer member  2322  may be disposed on the first extension bar  2320 . The second buffer member  2322  may be disposed on a lower region of the first extension bar  2320 . The second buffer member  2322  may be spaced apart from the first buffer member  2321  in the optical axis direction. The second buffer member  2322  may be disposed in a fourth hole (not shown) of the second housing  2100 . The second buffer member  2322  may be disposed to be inserted into the fourth hole. The second buffer member  2322  may include a through hole into which the first extension bar  2320  is inserted. 
     The first buffer member  2321  and the second buffer member  2322  may prevent noise caused by the vibration of the first extension bar  2320 . In addition, the first buffer member  2321  and the second buffer member  2322  may prevent the first extension bar  2320  from being deformed or damaged by an external impact. 
     The second lens barrel  2400  may be disposed in the second housing  2100 . The second lens barrel  2400  may be disposed in the second sub-housing  2120 . The second lens barrel  2400  may be disposed under the first lens barrel  2200 . For example, the second lens barrel  2400  may be disposed under the first lens barrel  2200  in the optical axis direction, and may be closer to the image sensor  2900  than the first lens barrel  2200 . The second lens barrel  2400  may be coupled to the fourth driving unit  2500 . The second lens barrel  2400  may move in the second housing  2100  by the fourth driving unit  2500 . In detail, the second lens barrel  2400  may be moved in the optical axis direction by the fourth driving unit  2500 . 
     The second lens barrel  2400  may include a second barrel part  2410 , a third lens unit  2405 , a second guide part  2420 , and a second elastic part  2430 . 
     The second barrel part  2410  may be disposed in a region overlapping the optical axis and may have an open shape on one surface and the other surface. For example, the second barrel part  2410  may have a cylindrical shape in which one surface and the other surface are open. 
     The second barrel part  2410  may include the second through hole  2411 . The second through hole  2411  may be a through hole penetrating through one surface and the other surface of the second barrel part  2410 . Here, one surface of the second barrel part  2410  may be a surface facing the first lens barrel  2200 , and the other surface may be a surface opposite to the one surface and facing the image sensor  2900 . 
     The third lens unit  2405  may be disposed on the second barrel part  2410 . In detail, the third lens unit  2405  may be disposed in the second through hole  2411 . For example, a screw line may be formed on an inner circumferential surface of the second through hole  2411 , and the third lens unit  2405  may be coupled to the second barrel part  2410  by the screw line. 
     The third lens unit  2405  may include at least one lens. The third lens unit  2405  may perform an auto focus function. The third lens unit  2405  may move in the optical axis direction. In detail, the third lens unit  2405  may move in the optical axis direction with respect to the first lens unit  2105 . The third lens unit  2405  may move separately from the second lens unit  2205 . Also, the distance at which the third lens unit  2405  can move in the optical axis direction may be the same as or different from that of the second lens unit  2205 . 
     The second guide part  2420  may extend outwardly from the second barrel part  2410 . For example, the second guide part  2420  may extend from the second barrel part  2410  in a direction perpendicular to the optical axis, for example, in a first direction (x-axis direction). In this case, the second guide part  2420  may extend in a direction opposite to the first guide part  2220 . For example, the first guide part  2220  may extend from the first barrel part  2210  in a +x-axis direction, and the second guide part  2420  may extend from the second barrel part  2410  in a −x-axis direction. 
     The second guide part  2420  may include a second lower surface  2421 , a second side surface  2422 , and a second upper surface  2423 . 
     The second upper surface  2423  may face an inner upper surface of the second housing  2100 . The second upper surface  2423  may face the inner upper surface of the second housing  2100  in the second direction (y-axis direction). A third groove  2423   h   1  may be disposed on the second upper surface  2423 . The third groove  2423   h   1  may have a concave shape in a direction from the second upper surface  2423  to the second lower surface  2421 . A second magnetic scaler  2620 , which will be described later, may be disposed in the third groove  2423   h   1 . 
     In addition, a fourth groove  2423   h   2  may be disposed on the second upper surface  2423 . The fourth groove  2423   h   2  may be spaced apart from the third groove  2423   h   1 . The fourth groove  2423   h   2  may be disposed in an edge region of the second upper surface  2423 . The fourth groove  2423   h   2  may provide a region in which a portion of the second elastic part  2430 , which will be described later, is disposed. In detail, the fourth groove  2423   h   2  may provide a region in which the second elastic part  2430  is mounted and fixed. 
     The second lower surface  2421  may face an inner lower surface of the second housing  2100 . The second lower surface  2421  may face the inner lower surface of the second housing  2100  in the second direction (y-axis direction). The second lower surface  2421  may include a plurality of sub lower surfaces. In detail, the second lower surface  2421  may include a first sub lower surface  2421   a  and a second sub-lower surface  2421   b  disposed above the first sub-lower surface  2421   a  in a second direction (y-axis direction). That is, the second sub lower surface  2421   b  may be disposed closer to the second upper surface  2423  than the first sub lower surface  2421   a . At least one second fastening protrusion (not shown) may be disposed on the second sub lower surface  2421   b . The second fastening protrusion may have a shape protruding downward from the second sub-lower surface  2421   b . The second fastening protrusion may be inserted into a second fixing groove (not shown) formed in a second elastic part  2430  to be described later. 
     Also, the second lower surface  2421  may include a second stepped surface  2425  disposed between the first sub lower surface  2421   a  and the second sub lower surface  2421   b . The second stepped surface  2425  may be connected to ends of the first sub-lower surface  2421   a  and the second sub-lower surface  2421   b . The second stepped surface  2425  may be defined as the second stepped portion  2425 . That is, the second lower surface  2421  may include the first sub lower surface  2421   a , the second sub lower surface  2421   b , and the second stepped portion  2425  and may have a stepped structure. 
     The second side surface  2422  may be disposed between the second upper surface  2423  and the second lower surface  2421 . In detail, the second side surface  2422  may be a surface connecting the second upper surface  2423  and the second lower surface  2421 . In more detail, the second side surface  2422  may be a surface connecting the second sub-lower surface  2421   b  and the second upper surface  2423 . The second side surface  2422  may face a first inner surface of the second sub-housing  2120  to be described later. 
     A second recess  2422   h  may be disposed on the second side surface  2422 . The second recess  2422   h  may have a concave shape from the second side surface  2422  toward the second barrel part  2410 . Also, the second recess  2422   h  may have a groove shape extending in the optical axis direction (z-axis direction). The second recess  2422   h  may have a V-shape when viewed from a front. 
     The second guide part  2420  may include a second insertion hole  2420   h   1 . The second insertion hole  2420   h   1  may be a hole passing through one surface and the other surface of the second guide part  2420 . Here, one surface of the second guide part  2420  may be a surface facing the first lens barrel  2200 , and the other surface may be a surface opposite to the one surface and facing the image sensor  2900 . 
     A second pin  2450  may be disposed in the second insertion hole  2420   h   1 . The second pin  2450  may be disposed to pass through the second insertion hole  2420   h   1 . The second pin  2450  may have a shape extending in the optical axis direction (z-axis direction). The second pin  2450  may be spaced apart from the first pin  2250  and may be parallel to the first pin  2250 . The second pin  2450  may have a length in the optical axis direction longer than that of the second lens barrel  2400 . The second pin  2450  may be coupled to at least one of the first sub-housing  2110  and the second sub-housing  2120 . The second lens barrel  2400  may move the second pin  2450  as a movement axis in the optical axis direction. Through this, the third lens unit  2405  disposed in the second lens barrel  2400  may perform a zoom function and/or an autofocus function. 
     The second elastic part  2430  may be disposed on the second guide part  2420 . For example, the second elastic part  2430  may be disposed on the second upper surface  2423 , the second lower surface  2421 , and the second side surface  2422  of the second guide part  2420 . The second elastic part  2430  may be coupled to the second guide part  2420 . 
     The second elastic part  2430  may include a third elastic member  2431  and a fourth elastic member  2432 . 
     The third elastic member  2431  may be coupled to the second guide part  2420 . The third elastic member  2431  may be disposed at a set position on the second side surface  2422 . 
     The third elastic member  2431  may have a shape corresponding to the second side surface  2422 . For example, the third elastic member  2431  may include a seventh region  2431   a , an eighth region  2431   b , and a ninth region  2431   c.    
     The seventh region  2431   a  and the eighth region  2431   b  may be disposed on the second side surface  2422  of the second guide part  2420  and may be spaced apart from each other. The seventh region  2431   a  and the eighth region  2431   b  may be disposed on a region of the second side surface  2422  in which the second recess  2422   h  is not disposed. 
     The ninth region  2431   c  may be disposed between the first region  2231   a  and the second region  2231   b  to connect the two regions  2431   a  and  2431   b . The ninth region  2431   c  may be disposed in a region corresponding to the second recess  2422   h . The ninth region  2431   c  may have a V-shape corresponding to the second recess  2422   h.    
     The fourth elastic member  2432  may be disposed on the second guide part  2420 . The fourth elastic member  2432  may be coupled to the second guide part  2420 . 
     The fourth elastic member  2432  may include a tenth region  2432   a , an eleventh region  2432   b , and a twelfth region  2432   c.    
     The tenth region  2432   a  may be disposed on the second lower surface  2421  of the second guide part  2420 . In detail, the tenth region  2432   a  may be disposed on the second sub lower surface  2421   b  of the second guide part  2420 . The tenth region  2431   a  may include a second fixing groove (not shown). The second fixing groove may be disposed in a region corresponding to the second fastening protrusion, and may have a shape corresponding to the second fastening protrusion. 
     The eleventh region  2432   b  may be connected to the tenth region  2432   a . For example, the eleventh region  2432   b  may be bent at one end of the tenth region  2432   a  and may be disposed on the second side surface  2422  of the second guide part  2420 . The eleventh region  2432   b  may be disposed on the third elastic member  2431 . The eleventh region  2432   b  may be parallel to the seventh region  2431   a  and the eighth region  2431   b . The eleventh region  2432   b  may be disposed to cover the third elastic member  2431 . 
     The twelfth region  2432   c  may be connected to the eleventh region  2432   b . For example, the twelfth region  2432   c  may be bent at one end of the eleventh region  2432   b  and may be disposed on the second upper surface  2423  of the second guide part  2420 . A portion of the twelfth region  2432   c  may be inserted into the fourth groove  2423   h   2  disposed on the second upper surface  2423 . 
     That is, the fourth elastic member  243  may be physically coupled to the second guide part  2420  by inserting the twelfth region  2432   c  into the fourth groove  2423   h   2  while the second fixing groove formed in the seventh region  2431   a  engages the second fastening protrusion. Accordingly, the second elastic part  2430  may maintain a state firmly coupled to the second guide part  2420 . 
     In addition, the second lens barrel  2400  may further include a second guide groove  2410   h   1 . The second guide groove  2410   h   1  may be disposed in a region extending outwardly from the second barrel part  2410 . The second guide groove  2410   h   1  may be disposed in a region corresponding to the first pin  2250 . The second guide groove  2410   h   1  may provide a space into which the first pin  2250  is inserted. The second lens barrel  2400  may move in the optical axis direction by the first pin  2250  and the second pin  2450 . In this case, the second guide groove  2410   h   1  may have an open shape at one side. For example, the second guide groove  2410   h   1  may have an open shape at one side facing the second inner surface of the second housing  2100 . Accordingly, friction and vibration generated when the second lens barrel  2400  is moved by the fourth driving unit  2500  can be minimized. 
     The second camera actuator  2000  may include a fourth driving unit  2500 . The fourth driving unit  2500  may be disposed in the second housing  2100 . The fourth driving unit  2500  may be coupled to the second lens barrel  2400 . The fourth driving unit  2500  may move the second lens barrel  2400  in the optical axis direction (z-axis direction). 
     The fourth driving unit  2500  may include a second piezoelectric device  2510 , a second extension part  2520 , a third buffer member  2521 , and a fourth buffer member  2522 . 
     The second piezoelectric device  2510  may include a piezo-electric device. For example, the second piezoelectric device  2510  may include a material that causes mechanical deformation by applied power. The second piezoelectric device  2510  may contract or expand by applied power and may cause mechanical deformation in a set direction. For example, the second piezoelectric device  2510  may generate vibration while causing mechanical deformation in the optical axis direction (z-axis direction) by the applied power. 
     The second piezoelectric device  2510  may include a second disk part  2511  and a second protrusion  2512 . The second disk part  2511  has a plate shape and may be disposed on the third hole  2113 . For example, the second disk part  2511  may be disposed on the third protrusion  2113   a  of the third hole  2113 . In detail, the second disk part  2511  may be disposed on the plurality of third sub-protrusions. The third protrusion  2113   a  may support the second disc part  2511 . 
     The second protrusion  2512  may be disposed under the second disk part  2511 . In detail, the second protrusion  2512  may be disposed under the second disc part  2511  in the third direction (z-axis direction) and may be connected to the second disc part  2511 . A portion of the first protrusion  2512  may be disposed in the third hole  2113 . The second protrusion  2512  may have a shape protruding toward the image sensor  2900 . A width (x-axis, y-axis direction) of the second protrusion  2512  may change toward the optical axis direction. For example, the width of the second protrusion  2512  may decrease as it approaches the image sensor  2900 . 
     The second extension part  2520  may extend in the optical axis direction. The second extension part  2520  may be disposed parallel to the optical axis and may be connected to the second piezoelectric device  2510 . For example, an upper end of the second extension part  2520  may be connected to the second protrusion  2512 . Also, the lower end of the second extension part  2520  may be inserted into the lower end of the second housing  2100 , for example, a fifth hole (not shown) formed at the lower end of the second sub-housing  2120 . 
     In addition, one region of the second extension part  2520  may be connected to the second lens barrel  2400 . For example, the second extension part  2520  may be connected to the second lens barrel  2400  by the second elastic part  2430 . In detail, the second extension part  2520  may be disposed between the third elastic member  2431  and the fourth elastic member  2432 . In more detail, the second extension part  2520  may be disposed between the ninth region  2431   c  of the third elastic member  2431  and the eleventh region  2432   b  of the fourth elastic member  2432 . The second extension part  2520  may be fixed by the elastic force of the third elastic member  2431  and the fourth elastic member  2432 . 
     The second extension part  2520  may transmit the vibration generated in the second piezoelectric device  2510  to the second lens barrel  2400 . The second lens barrel  2400  may move upward or downward (z-axis direction, optical-axis direction) according to the vibration direction of the second extension part  2520 . Through this, the third lens unit  2405  in the second lens barrel  2400  may move to perform a zooming function of zooming up or zooming out. 
     The third buffer member  2521  may be disposed on the second extension part  2520 . The third buffer member  2521  may be disposed on an upper region of the second extension part  2520 . The third buffer member  2521  may be disposed in the third hole  2113  of the second housing  2100 . For example, the third buffer member  2521  may be disposed between the third protrusion  2113   a  and the fourth protrusion  2113   b  of the third hole  2113 . The third buffer member  2521  may be fixed to a position set by the third protrusion  2113   a  and the fourth protrusion  2113   b . In addition, the third buffer member  2521  may include a through hole into which the second extension part  2520  is inserted. 
     The fourth buffer member  2522  may be disposed on the second extension part  2520 . The fourth buffer member  2522  may be disposed on a lower region of the second extension part  2520 . The fourth buffer member  2522  may be spaced apart from the third buffer member  2521  in the optical axis direction. The fourth buffer member  2522  may be disposed in a fifth hole (not shown) of the second housing  2100 . The fourth buffer member  2522  may be disposed to be inserted into the fifth hole. The second buffer member  2322  may include a through hole into which the second extension part  2520  is inserted. 
     The third buffer member  2521  and the fourth buffer member  2522  may prevent noise caused by vibration of the second extension part  2520 . In addition, the third buffer member  2521  and the fourth buffer member  2522  may prevent the second extension part  2520  from being deformed or damaged by an external impact. 
     The second camera actuator  2000  may include a first magnetic scaler  2610 , a first sensing unit (not shown), a second magnetic scaler  2620 , and a second sensing unit (not shown). 
     The first magnetic scaler  2610  may be disposed on the first lens barrel  2200 . For example, the first magnetic scaler  2610  may be disposed on the first lower surface  2223 . In detail, the first magnetic scaler  2610  may be disposed in the first groove  223   h   1  of the first lens barrel  2200 . The first magnetic scaler  2610  may move along the optical axis direction together with the first lens barrel  2200 . 
     The first magnetic scaler  2610  may include a plurality of magnets. For example, the first magnetic scaler  2610  may have an N pole and an S pole alternately disposed in the optical axis direction. 
     The first sensing unit may be disposed adjacent to the first magnetic scaler  2610 . For example, the first sensing unit may be disposed to face the first magnetic scaler  2610  in a first direction (x-axis direction) or a second direction (y-axis direction). The first sensing unit may detect a position of the first magnetic scaler  2610 . Through this, the first sensing unit may detect the position and movement of the first lens barrel  2200  moving together with the first magnetic scaler  2610 . 
     The second magnetic scaler  2620  may be disposed on the second lens barrel  2400 . For example, the second magnetic scaler  2620  may be disposed on the second upper surface  2423 . In detail, the second magnetic scaler  2620  may be disposed in the third groove  2423   h   1  of the second lens barrel  2400 . The second magnetic scaler  2620  may move along the optical axis direction together with the second lens barrel  2400 . 
     The second magnetic scaler  2620  may include a plurality of magnets. For example, the second magnetic scaler  2620  may have an N pole and an S pole alternately disposed in the optical axis direction. 
     Also, the second sensing unit may be disposed adjacent to the second magnetic scaler  2620 . For example, the second sensing unit may be disposed to face the second magnetic scaler  2620  in a first direction (x-axis direction) or a second direction (y-axis direction). The second sensing unit may detect a position of the second magnetic scaler  2620 . Through this, the second sensing unit may detect the position and movement of the second lens barrel  2400  moving together with the second magnetic scaler  2620 . 
     Also, although not shown in the drawings, the second camera actuator  2000  according to the embodiment may further include a gyro sensor (not shown). The gyro sensor may be disposed in the second housing  2100 . The gyro sensor may detect a movement of a user using the camera actuator. 
     The second camera actuator  2000  according to the embodiment may include a second substrate  2800 . The second substrate  2800  may be disposed on the second housing  2100 . The second substrate  2800  may be disposed to surround a partial region of the second housing  2100 . For example, the second substrate  2800  may be disposed to surround a portion of the outer side of the second sub-housing  2120 . The second substrate  2800  may provide power or current to components disposed in the second housing  2100 . That is, the second substrate  2800  may be a circuit board, and may include a circuit board having a wiring pattern that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), and a rigid flexible printed circuit board (Rigid Flexible PCB). The second substrate  2800  may be electrically connected to the above-described first circuit board  310 . 
     The second substrate  2800  may include a first end  2810 . The first end  2810  may be disposed on the first piezoelectric device  2310  of the third driving unit  2300 . For example, the first end  2810  may be disposed on the first disk part  2311  of the first piezoelectric device  2310 . In detail, the first end  2810  may be disposed on one surface of the first disk part  2311 . Also, the first end  2810  may be disposed on the second piezoelectric device  2510  of the fourth driving unit  2500 . For example, the second end  2820  may be disposed on the second disk part  2511  of the second piezoelectric device  2510 . In detail, the first end  2810  may be disposed on one surface of the second disk part  2511 . 
     The second substrate  2800  may include a second end  2820 . The first end  2810  may be spaced apart from the first end  2810 . Also, the second end  2820  may be disposed in a region that does not overlap the first end  2810  in the optical axis direction. 
     The second end  2820  may be disposed on the first piezoelectric device  2310  of the third driving unit  2300 . For example, the second end  2820  may be disposed on the first disk part  2311  of the first piezoelectric device  2310 . In detail, the first end  2810  may be disposed on the other surface opposite to one surface of the first disk part  2311 . Also, the second end  2820  may be disposed on the second piezoelectric device  2510  of the fourth driving unit  2500 . For example, the second end  2820  may be disposed on the second disk part  2511  of the second piezoelectric device  2510 . In detail, the second end  2820  may be disposed on the other surface opposite to one surface of the second disk part  2511 . 
     That is, the second substrate  2800  may supply power to the first piezoelectric device  2310  and the second piezoelectric device  2510 . Accordingly, the third driving unit  2300  and the fourth driving unit  2500  may drive the first lens barrel  2200  and the second lens barrel  2400  by the applied power, respectively. 
     As described above, the second camera actuator  2000  according to the embodiment includes a third driving unit  2300  and a fourth driving unit  2500  including a piezoelectric device, and the first and second lens barrels  2200  and  2400  may be moved in the optical axis direction by the third and fourth driving units  2300  and  2500 . However, the embodiment is not limited thereto, and the third and fourth driving units  2300  and  2500  may include a voice coil motor (VCM) or a shape memory alloy. In this case, the third and fourth driving units  2300  and  2500  may move the first and second lens barrels  2200  and  2400  by using the electromagnetic force of the VCM or a physical change of the shape memory alloy. 
     The second camera actuator  2000  according to the embodiment may include an image sensor  2900 . The image sensor  2900  may collect light passing in the order of the first lens unit  2105 , the second lens unit  2205 , and the third lens unit  2405  and convert it into an image. The image sensor  2900  may be disposed to coincide with an optical axis of a lens of the lens units  105 ,  205 , and  405 . The optical axis of the image sensor  2900  and the optical axis of the lens may be aligned. 
       FIG.  38    is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied. 
     Referring to  FIG.  38   , the mobile terminal  3  may include a camera module  10 , an autofocus device  31 , and a flash module  33  provided on the rear side. 
     The camera module  10  may include an image capturing function and an auto focus function. For example, the camera module  10  may include an autofocus function using an image. 
     The camera module  10  processes an image frame of a still image or a moving image obtained by an image sensor in a shooting mode or a video call mode. The processed image frame may be displayed on a predetermined display unit and stored in a memory. A camera (not shown) may also be disposed on the front of the mobile terminal body. 
     For example, the camera module  10  may include a first camera module  10 A and a second camera module  10 B. In this case, at least one of the first camera module  10 A and the second camera module  10 B may include the aforementioned camera module, for example, the camera module  10  according to  FIGS.  1  to  20   . Accordingly, the camera module  10  may implement an OIS function together with a zoom function and an autofocus function. 
     The auto focus device  31  may include an auto focus function using a laser. The auto focus device  31  may be mainly used in a condition in which the auto focus function using the image of the camera module  10  is deteriorated, for example, in proximity of 10 m or less or in a dark environment. The autofocus device  31  may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor device and a light receiving unit that converts light energy such as a photodiode into electrical energy. 
     The flash module  33  may include a light emitting device emitting light therein. The flash module  33  may be operated by a camera operation of a mobile terminal or by a user&#39;s control. 
     Next,  FIG.  39    is a perspective view of the vehicle  5  to which the camera module according to the embodiment is applied. For example,  FIG.  39    is an external view of a vehicle including a vehicle driving assistance device to which the camera module  10  according to the embodiment is applied. 
     Referring to  FIG.  39   , the vehicle  5  according to the embodiment may include wheels  53 FL and  53 RL that rotate by a power source and a predetermined sensor. The sensor may be the camera sensor  51 , but is not limited thereto. 
     The camera  51  may be a camera sensor to which the camera module according to the embodiment, for example, the camera module  10  according to  FIGS.  1  to  37    is applied. 
     The vehicle  5  of the embodiment may acquire image information through a camera sensor  51  that captures a front image or a surrounding image, and it is possible to determine a lane non-identification situation using the image information, and generate a virtual lane when the lane is not identified. 
     For example, the camera sensor  51  may acquire a front image by photographing the front of the vehicle  5 , and a processor (not shown) may obtain image information by analyzing an object included in the front image. 
     For example, when an object such as a median, curb, or street tree corresponding to a lane, an adjacent vehicle, a driving obstacle, and an indirect road marking is captured in the image captured by the camera sensor  51 , the processor may detect such an object and include it in the image information. 
     In this case, the processor may further supplement the image information by acquiring distance information from the object detected through the camera sensor  51 . The image information may be information about an object photographed in an image. 
     The camera sensor  51  may include an image sensor and an image processing module. The camera sensor  51  may process a still image or a moving image obtained by an image sensor (eg, CMOS or CCD). The image processing module may process a still image or a moving image obtained through the image sensor, extract necessary information, and transmit the extracted information to the processor. 
     In this case, the camera sensor  51  may include a stereo camera to improve the measurement accuracy of the object and further secure information such as the distance between the vehicle  5  and the object, but is not limited thereto. 
     Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment, and it is not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and variations should be interpreted as being included in the scope of the embodiments. 
     In the above, the embodiment has been mainly described, but this is only an example and does not limit the embodiment, and those of ordinary skill in the art to which the embodiment pertains will appreciate that various modifications and applications not illustrated above are possible without departing from the essential characteristics of the present embodiment. For example, each component specifically shown in the embodiment can be implemented by modification. And the differences related to these modifications and applications should be interpreted as being included in the scope of the embodiments set forth in the appended claims.