Patent Publication Number: US-2023161229-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. 
     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, a zoom actuator is used for a zooming function in the camera module. Such an actuator moves the positions of a plurality of zoom lens groups for auto-focusing and change of zoom magnification. 
     At this time, the actuator must accurately sense the current positions of the plurality of zoom lens groups in order to move the positions of the plurality of zoom lens groups, and accordingly move the plurality of zoom lens groups to the target positions. 
     Accordingly, the conventional camera module includes a sensing part for sensing the position of the zoom lens group. 
     For example, the sensing part may include a Hall sensor and a single-pole magnet. At this time, the camera module needs a stroke of 5 to 10 mm or more to realize a high magnification zoom. However, there is a limit to sensing the position of a zoom lens group having a stroke of 5 to 10 mm or more using only the Hall sensor and the single pole magnet. 
     As another example, the sensing part may include a photo interrupter (PI) sensor. However, when the position of the lens group is sensed using the PI sensor, light generated from the PI sensor may enter the image sensor, but there is a problem in that image quality deterioration such as flare occurs. In addition, the PI sensor as described above is difficult to miniaturize, and accordingly, there is a limit in application to a camera module mounted on a terminal. 
     In addition, in the conventional camera module, an initial position of the lens group is measured using a mechanical stopper. However, there is a problem in that the accuracy of the initial position measurement of the lens group using the mechanical stopper decreases due to injection conditions and assembly deviations of various components included in the camera module. 
     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 capable of autofocus and high magnification zoom. 
     In addition, the embodiment provides a camera actuator and a camera module capable of accurately sensing a current position of a lens group. 
     In addition, the embodiment provides a camera actuator and a camera module that can precisely move the lens group to an initial position. 
     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 a lens group is moved. 
     In addition, the embodiment provides a camera actuator and a camera module that can have improved process efficiency. 
     Technical problems to be solved by the proposed embodiments are not limited to the above-mentioned technical problems, and other technical problems not mentioned may be clearly understood by those skilled in the art to which the embodiments proposed from the following descriptions belong. 
     Technical Solution 
     A lens driving device according to an embodiment includes a moving part including a lens; a driving part for driving the moving part in an optical axis direction; and a sensing part for sensing a position of the moving part; wherein the moving part includes: a magnet scaler in which a first pole and a second pole are alternately arranged in a first direction; and a reference magnet corresponding to the magnet scaler and having a first pole and a second pole disposed in a second direction perpendicular to the first direction. 
     In addition, the reference magnet is a single magnet. 
     In addition, the first pole of the reference magnet is disposed to face at least one of the first pole and the second pole of the magnet scaler. 
     In addition, the magnet scaler and the reference magnet are coupled to each other. 
     In addition, the sensing part outputs a first sensing signal corresponding to a movement position of the reference magnet and a second sensing signal corresponding to a movement position of the magnet scaler; wherein the first sensing signal is a sensing value for moving the moving part to an initial position, and wherein the second sensing signal is a sensing value for moving the moving part to a target position within a movement stroke of the moving part. 
     In addition, the lens driving device further includes a housing, wherein the housing includes a hole in which at least a portion of the sensing part is disposed, and wherein the magnet part and the sensing part overlaps to each other in the second direction. 
     In addition, the hole includes: a first sub hole corresponding to the magnet scaler, and a second sub hole corresponding to the reference magnet, wherein the sensing part includes: a first sub sensing part disposed to face the magnet scaler with respect to the first sub hole; and a second sub sensing part disposed to face the reference magnet with respect to the second sub hole. 
     In addition, the lens driving device further includes a substrate disposed on an outer peripheral surface of the housing, wherein at least a portion of the sensing part is positioned in the hole in a state in which the sensing part is disposed on the substrate. 
     In addition, the lens driving device further includes a fixed part disposed in the housing and including a first lens part, wherein the moving part includes: a first lens barrel disposed to be spaced apart from the fixed part in the optical axis direction in the housing; and a second lens barrel disposed to be spaced apart from the moving part in the optical axis direction in the housing, wherein the driving part includes: a first driving part coupled to the first lens barrel in the housing and driving the first lens barrel in the optical axis direction; and a second driving part coupled to the second lens barrel in the housing and driving the second lens barrel in the optical axis direction; wherein the magnet part includes: a first magnet part including a first magnet scaler and a first reference magnet disposed on one surface of the first lens barrel; and a second magnet part including a second magnet scaler and a second reference magnet disposed on the other surface of the second lens barrel, wherein the sensing part includes: a first sensing part disposed adjacent to the first magnet part; and a second sensing part disposed adjacent to the second magnet part. 
     In addition, the housing includes: a first housing in which the fixed part is disposed; and a second housing in which the first lens barrel and the second lens barrel are disposed, wherein the hole includes: a first hole formed on a lower surface of the second housing and vertically overlapping with the first magnet part and the first sensing part; and a second hole disposed on an upper surface of the second housing and vertically overlapping with the second magnet part and the second sensing part. 
     In addition, the first lens barrel includes a first barrel part including a second lens part; a first guide part extending outwardly from the first barrel part; and a first elastic part connected to the first driving part, wherein the second lens barrel includes: a second barrel part including a third lens part; a second guide part extending outwardly from the second barrel part; and a second elastic part connected to the second driving part. 
     In addition, the first driving part includes a first piezoelectric device disposed in the housing; and a first extension bar extending in the optical axis direction from the first piezoelectric device, wherein the second driving part includes a second piezoelectric device disposed in the housing; and a second extension bar extending in the optical axis direction from the second piezoelectric device, wherein one region of the first extension bar is connected to the first elastic part, and wherein one region of the second extension bar is connected to the second elastic part. 
     In addition, the lens driving device includes first and second pins extending in the optical axis direction within the housing and spaced apart from each other, wherein the first pin is disposed to be inserted into a first insertion hole of the first lens barrel, wherein the second pin is disposed to be inserted into a second insertion hole of the second lens barrel, wherein the first lens barrel moves along the first pin, and wherein the second lens barrel moves along the second pin. 
     In addition, the first lens barrel further includes a first guide groove in which the second pin is disposed, and the second lens barrel further includes a second guide groove in which the first pin is disposed, and wherein each of the first and second guide grooves has an open shape at one side. 
     In addition, the first magnet part is a first single magnetized magnet in which the first magnet scaler and the first reference magnet are integrally formed, and wherein the second magnet part is a second single magnetized magnet in which the second magnet scaler and the second reference magnet are integrally formed. 
     On the other hand, the lens driving device according to the embodiment includes a lens barrel including a lens; a piezo driving part for driving the lens barrel in an optical axis direction; a magnet part disposed on the lens barrel; and a sensing part corresponding to the magnet part, wherein the magnet part includes: a magnet scaler in which a first pole and a second pole are alternately disposed in an optical axis direction; and a reference magnet corresponding to the magnet scaler and having a first pole and a second pole disposed in a direction perpendicular to the optical axis direction. 
     In addition, the reference magnet is a single magnet including a first pole disposed to face at least one of the first pole and the second pole of the magnet scaler. 
     In addition, the sensing part outputs a first sensing signal corresponding to a movement position of the reference magnet and a second sensing signal corresponding to a movement position of the magnet scaler; wherein the first sensing signal is a sensing value for moving the moving part to an initial position, and wherein the second sensing signal is a sensing value for moving the moving part to a target position within a movement stroke of the moving part. 
     On the other hand, the camera device according to the embodiment includes a first lens barrel including a first lens part, a second lens barrel including a second lens part spaced apart from the first lens part in an optical axis direction, and a third lens barrel including a third lens part spaced apart from the second lens part in the optical axis direction; a first driving part for driving the second lens barrel in the optical axis direction; a second driving part for driving the third lens barrel in the optical axis direction; a first magnet part including a first magnet scaler and a first reference magnet disposed on one surface of the second lens barrel; a second magnet part including a second magnet scaler and a second reference magnet disposed on the other surface of the third lens barrel; a first sensing part configured to acquire a first sensing signal corresponding to a change in magnetic force of the first magnet part; a second sensing part configured to acquire a second sensing signal corresponding to a change in magnetic force of the second magnet part; and a controller configured to control movement of the second lens barrel and the third lens barrel based on the first and second sensing signals. 
     In addition, the controller outputs a control signal for moving the first lens barrel to an initial position and a target position to the first driving part based on the first sensing signal acquired through the first sensing part, and outputs a control signal for moving the second lens barrel to an initial position and a target position to the second driving part based on a second sensing signal acquired through the second sensing part. 
     In addition, the first sensing part includes: a first-first sub sensing part configured to acquire a first sensing signal corresponding to a change in magnetic force of the first reference magnet; and a first-second sensing part for obtaining a second sensing signal corresponding to a change in magnetic force of the first magnet scaler, wherein the second sensing part includes a second-first sub sensing part configured to acquire a third sensing signal corresponding to a change in magnetic force of the second reference magnet; and a second-second sub sensing part configured to acquire a fourth sensing signal corresponding to a change in magnetic force of the second magnet scaler. 
     In addition, the controller moves the first lens barrel to an initial position based on the first sending signal, moves the first lens barrel to a target position based on the second sensing signal, moves the second lens barrel to an initial position based on the third sensing signal, and moves the second lens barrel to a target position based on the fourth sensing signal. 
     Advantageous Effects 
     The camera actuator and the camera module according to the embodiment may have improved optical properties. In detail, the camera actuator and the camera module according to the embodiment include a driving part for driving the lens group including a piezoelectric device, the lens group can be more precisely controlled by the driving part, and friction generated when the lens group is moved can be minimized. Accordingly, the embodiment may provide more improved autofocus and zoom functions. 
     In addition, the camera actuator and the camera module according to the embodiment may have improved operational reliability. In detail, the embodiment includes a first magnet part and a second magnet part mounted on the lens barrel. In this case, the first magnet part may include a reference magnet, and the second magnet part may include a magnet scaler. Also, the embodiment may include a sensing part disposed adjacent to the first magnet part and the second magnet. The sensing part may measure a change in a magnetic field by the first magnet part and the second magnet part. That is, the sensing part may precisely move the lens group to the initial position by using the change in the magnetic field by the first magnet part. Also, the sensing part may precisely move the lens group to the target position by using the change in the magnetic field by the second magnet part. Accordingly, the embodiment may improve the accuracy of the autofocus and zoom functions of the camera module, and thus the operation reliability may be improved. 
     In addition, the camera actuator and the camera module according to the embodiment can eliminate assembly deviation. In detail, although the embodiment includes the first magnet part and the second magnet part, this may be an integrally formed magnet part. That is, the integrally formed magnet part may be a magnet configured by magnetizing a magnet scaler corresponding to the second magnet part and a reference magnet corresponding to the first magnet part at once. Therefore, according to the embodiment, it is possible to solve the position erroneous detection that occurs due to the assembly deviation between the magnet scaler and the reference magnet, and thus the operation reliability can be further improved. 
     In addition, the camera actuator and the camera module according to the embodiment enable the position of the lens group to be sensed using a magnet scaler and a reference magnet rather than a conventional PI sensor, so that the position of the lens group can be sensed without image deterioration and thus image quality can be improved. 
     In addition, the camera actuator and the camera module according to the embodiment may have improved process efficiency. In detail, the camera actuator and the camera module according to the embodiment include a housing accommodating a plurality of lens groups, for example, a plurality of lens barrels, and a guide jaw may be disposed on an inner lower surface of the housing facing the lens barrel. In this case, the guide jaw may have a position and a distance corresponding to a set lens barrel among the plurality of lens barrels, thereby preventing an unset lens barrel from being disposed. Accordingly, it is possible to effectively arrange the set lens barrels at the set positions, and it is possible to prevent other lens barrels from being misplaced. Accordingly, the embodiment may reduce defects caused by misalignment of the plurality of lens barrels, and may have improved process efficiency. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of a camera actuator according to an embodiment. 
         FIG.  2    is an exploded perspective view of a camera actuator according to an embodiment. 
         FIG.  3    is a cross-sectional view of a camera actuator according to an embodiment. 
         FIG.  4    is a front view of a camera actuator according to an embodiment. 
         FIG.  5    is a perspective view illustrating first and second driving parts disposed in a housing in a camera actuator according to an embodiment. 
         FIG.  6    is an exploded perspective view of a first driving part according to an embodiment. 
         FIG.  7    is an exploded perspective view of a second driving part according to an embodiment. 
         FIG.  8    is a perspective view of a part of a camera actuator according to an embodiment. 
         FIG.  9    is an exploded perspective view of a housing according to an embodiment. 
         FIG.  10    is a front view of a second housing according to an embodiment. 
         FIG.  11    is a front view of a second driving part disposed in a second housing according to an exemplary embodiment. 
         FIG.  12    is a front view of first and second driving parts disposed in a second housing according to an exemplary embodiment. 
         FIG.  13    is a view illustrating first and second driving parts according to an embodiment. 
         FIG.  14    is a front view of a second driving part disposed in a second housing according to another exemplary embodiment. 
         FIG.  15    is a view illustrating a sensing signal acquired through a sensing part according to an exemplary embodiment. 
         FIG.  16    is a view illustrating the second sensing signal shown in  FIG.  15    in more detail. 
         FIG.  17    is a view illustrating a sensing signal acquired through a sensing part according to another exemplary embodiment. 
         FIG.  18    is a flowchart for explaining an initial operation method of a camera module according to an embodiment. 
         FIG.  19    is a flowchart for explaining a method of operating a function of a camera module according to an embodiment. 
         FIG.  20    is a perspective view of a camera module according to an embodiment. 
         FIG.  21    is a perspective view in which some components are omitted in a camera module according to an embodiment. 
         FIG.  22    is an exploded perspective view of a second camera actuator according to an embodiment. 
         FIG.  23    is a view of a third driving part of a second camera actuator according to an embodiment. 
         FIG.  24    is a view of a third housing of a second camera actuator according to an embodiment. 
         FIGS.  25  and  26    are views of a prism unit of a second camera actuator according to an embodiment. 
         FIG.  27    is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied. 
         FIG.  28    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 acquired 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 a perspective view of a camera actuator according to an embodiment,  FIG.  2    is an exploded perspective view of a camera actuator according to an embodiment,  FIG.  3    is a cross-sectional view of a camera actuator according to an embodiment,  FIG.  4    is a front view of a camera actuator according to an embodiment,  FIG.  5    is a perspective view illustrating first and second driving parts disposed in a housing in a camera actuator according to an embodiment,  FIG.  6    is an exploded perspective view of a first driving part according to an embodiment,  FIG.  7    is an exploded perspective view of a second driving part according to an embodiment,  FIG.  8    is a perspective view of a part of a camera actuator according to an embodiment. 
     Referring to  FIGS.  1  to  8   , the camera actuator  1000  according to the embodiment may include a housing  100 , a first lens part  105 , a first lens barrel  200 , a first driving part  300 , a second lens barrel  400  and a second driving part  500 . 
     The housing  100  may form the exterior of the camera actuator  1000 . The housing  100  may have upper and lower partial regions open and may have a hexahedral shape. 
     The housing  100  may include an accommodating space therein. The first lens barrel  200 , the first driving part  300 , the second lens barrel  400 , and the second driving part  500  may be accommodated in the accommodating space of the housing  100 . 
     Here, the first lens part  105  is disposed in a fixed position within the housing  100 , and accordingly, it may be referred to as a ‘fixed part’. In addition, the positions of the first lens barrel  200  and the second lens barrel  400  may be moved within the housing  100  for a zoom function or an autofocus function, and accordingly, this may be referred to as a ‘moving part’. 
     The housing  100  may include a first housing  110  and a second housing  120 . 
     The first housing  110  may include a first hole  111 . The first hole  111  may be formed on one side of the first housing  110 . The first hole  111  may be a hollow hole passing through an outside and an inside of the first housing  110 . 
     The first housing  110  may further include a second hole  112  and a third hole  113 . The second hole  112  and the third hole  113  may be disposed on one side of the first housing  110 . The second hole  112  and the third hole  113  may be hollow holes passing through the outside and the inside of the first housing  110 . The second hole  112  and the third hole  113  may be spaced apart from the first hole  111 . 
     In detail, the first hole  111  may be disposed between the second hole  112  and the third hole  113 . The first hole  111  may be disposed at equal intervals to the second hole  112  and the third hole  113 . 
     The second hole  112  may include a plurality of protrusions protruding from an inner circumferential surface of the second hole  112  toward a center of the second hole  112 . For example, the plurality of protrusions may include a first protrusion  112   a  disposed at an upper end of the second hole  112  and a second protrusion  112   b  disposed at a lower end of the second hole  112  in the optical axis direction. 
     In detail, the first protrusion  112   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  112  along a circumference of a concentric circle shape. Also, the second protrusion  112   b  may be spaced apart from the first protrusion  112   a  in the optical axis direction. The second protrusion  112   b  may be disposed below the first protrusion  112   a.  The second protrusion  112   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  112  along a circumference of a concentric circle shape. The first protrusion  112   a  and the second protrusion  112   b  may provide a space in which a portion of the first driving part  300  to be described later, for example, a first buffer member  321  is disposed. 
     The third hole  113  may include a plurality of protrusions protruding from the inner circumferential surface of the third hole  113  toward the center of the third hole  113 . The plurality of protrusions may include a third protrusion  113   a  disposed at an upper end of the third hole  113  and a fourth protrusion  1134  disposed at a lower end of the second hole  112  with respect to the optical axis direction. 
     The third protrusion  113   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  113  along the circumference of a concentric circle. Also, the fourth protrusion  1134  may be spaced apart from the third protrusion  113   a  in the optical axis direction. The fourth protrusion  1134  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  113  along the circumference of a concentric circle. The third protrusion  113   a  and the fourth protrusion  1134  may provide a space in which a portion of the second driving part  500  to be described later, for example, a third buffer member  521  is disposed. 
     The second housing  120  may be disposed under the first housing  110 . In detail, the second housing  120  may be disposed under the first housing  110  in a third direction (z-axis, optical-axis direction). The second housing  120  may be disposed closer to the image sensor  900  to be described later than the first housing  110 . The first lens barrel  200 , the first driving part  300 , the second lens barrel  400 , and the second driving part  500  may be disposed in the second housing  120 . 
     The second housing  120  may be coupled to the first housing  110 . For example, the first housing  110  and the second housing  120  may be coupled by a separate fastening member (not shown) such as a screw. In addition, the first housing  110  and the second housing  120  may be coupled to each other by physical coupling of coupling jaws and coupling grooves respectively formed therein. 
     The second housing  120  may include a plurality of holes. As an embodiment, the second housing  120  may include at least one hole formed in a region overlapping a magnet part, which will be described later, in the second direction (or the y-axis direction). 
     Specifically, the second housing  120  may include a first hole (to be described later) formed in a region overlapping the magnet parts  610  and  615  disposed in the first lens barrel  200  in the second direction. Also, the second housing  120  may include a second hole (to be described later) formed in a region overlapping with the magnet parts  620  and  625  disposed in the second lens barrel  400  in the second direction. The first hole may correspond to at least a portion of the magnet parts  610  and  615 . Also, the second hole may correspond to at least a portion of the magnet parts  620  and  625 . At this time, the magnet parts  610  and  615  included in the first lens barrel  200  are disposed below the first lens barrel  200 , and accordingly, the first hole may be formed at a lower side of the second housing  120 . In addition, the magnet parts  620  and  625  included in the second lens barrel  400  are disposed on the second lens barrel  400 , and accordingly, the second hole may be formed on an upper side of the second housing  120 . This will be described in more detail below. 
     The first lens part  105  is disposed in the housing  100  and may include at least one lens. For example, the first lens part  105  may be disposed in the first housing  110 . In detail, the first lens part  105  may be disposed in the first hole  111  of the first housing  110 . For example, the first lens part  105  may be coupled to the first housing  110  by a thread formed on an inner circumferential surface of the first hole  111 . 
     The first lens barrel  200  may be disposed in the housing  100 . The first lens barrel  200  may be disposed in the second housing  120 . The first lens barrel  200  may be disposed under the first lens part  105 . For example, the first lens barrel  200  may be disposed below the first lens part  105  in the optical axis direction, and may be closer to the image sensor  900  than the first lens part  105 . The first lens barrel  200  may be coupled to the first driving part  300 . The first lens barrel  200  may be moved in the housing  100  by the first driving part  300 . In detail, the first lens barrel  200  may be moved in the optical axis direction by the first driving part  300 . 
     The first lens barrel  200  may include a first barrel part  210 , a second lens part  205 , a first guide part  220 , and a first elastic part  230 . 
     The first barrel part  210  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  210  may have a cylindrical shape in which one surface and the other surface are open. 
     The first barrel part  210  may include the first through hole  211 . The first through hole  211  may be a through hole penetrating through one surface and the other surface of the first barrel part  210 . Here, one surface of the first barrel part  210  may be a surface facing the first lens part  105 , and the other surface may be a surface opposite to the one surface and facing the image sensor  900 . 
     The second lens part  205  may be disposed on the first barrel part  210 . In detail, the second lens part  205  may be disposed in the first through hole  211 . For example, a thread may be formed on an inner circumferential surface of the first through hole  211 , and the second lens part  205  may be coupled to the first barrel part  210  by the thread. 
     The second lens part  205  may include at least one lens. The second lens part  205  may perform a zoom function. The second lens part  205  may move in the optical axis direction. In detail, the second lens part  205  may move in the optical axis direction with respect to the first lens part  105 . 
     The first guide part  220  may extend outwardly from the first barrel part  210 . For example, the first guide part  220  may extend from the first barrel part  210  in a direction perpendicular to the optical axis, for example, in a first direction (x-axis direction). 
     The first guide part  220  may include a first upper surface  211 , a first side surface  222 , and a first lower surface  223 . 
     The first upper surface  221  may face an inner upper surface  122  of the housing  100  to be described later. The first upper surface  221  may face the inner upper surface  122  of the housing  100  in the second direction (y-axis direction). The first upper surface  221  may include a plurality of sub upper surfaces. In detail, the first upper surface  221  may include a first sub upper surface  221   a  and a second sub upper surface  221   b  disposed lower in the second direction (y-axis direction) than the first sub upper surface  221   a.  That is, the second sub upper surface  221   b  may be disposed adjacent to the first lower surface  223  than the first sub upper surface  221   a.  At least one first fastening protrusion (not shown) may be disposed on the second sub upper surface  221   b.  The first fastening protrusion may have a shape protruding upward on the second sub upper surface  221   b.  The first fastening protrusion may be inserted into a first fixing groove (not shown) formed in a first elastic part  230  to be described later. 
     Also, the first upper surface  221  may include a first stepped surface  225  disposed between the first sub upper surface  221   a  and the second sub upper surface  221   b.  The first stepped surface  225  may be connected to ends of the first sub upper surface  221   a  and the second sub upper surface  221   b.  The first stepped surface  225  may be defined as the first stepped portion  225 . That is, the first upper surface  221  may include the first sub upper surface  221   a,  the second sub upper surface  221   b,  and the first stepped portion  225  and may have a stepped structure. 
     The first lower surface  223  may face the inner lower surface  121  of the housing  100  to be described later. A first groove  2231  may be disposed on the first lower surface  223 . The first groove  2231  may have a concave shape in a direction from the first lower surface  223  to the first upper surface  221 . The first groove  2231  may have a T-shape, but is not limited thereto. A first magnet part  610  and  615  to be described later may be disposed in the first groove  2231 . Specifically, a first-first magnet  610  and a first-second magnet  615  to be described later may be disposed in the first groove  2231 . Accordingly, the first groove  2231  may include a first-first sub groove in which the first-first magnet  610  is disposed, and a first-second sub-groove in which the first-second magnets  615  are disposed. The first-first sub groove and the first-second sub groove may be connected to each other, and differently, they may be partitioned by a partition wall formed in a middle. Meanwhile, although it is illustrated that the first groove  2231  has a T-shape in the drawing and the first magnet part  610  and  615  is disposed therein, the embodiment is not limited thereto. In detail, the first-second sub groove of the first groove  2231  may be formed to have the same area as the first-first sub groove so as to enlarge a length of a neutral zone around the first-second magnet  615 . For example, a sum of a size of the first-second magnet  615  and a size of the neutral zone of the first-second magnet  615  may be the same as the size of the first-first magnet  610 , and otherwise it may be larger than this. 
     The first-first magnet  610  may be a magnet scaler having a structure in which a plurality of magnets having different polarities are sequentially disposed in a third direction corresponding to the optical axis direction. The first-second magnet  615  may be a reference magnet. Also, the first-second magnet  615  may be a single-pole magnet. In detail, the first-second magnets  615  are single-pole magnetized magnets, and accordingly, it may be referred to as ‘single-pole magnets’. In addition, the first-second magnet  615  is provided to move the lens barrel to an initial position as a reference, and accordingly, it may be referred to as a ‘reference magnet’. Hereinafter, this will be described as a single-pole magnet. 
     The first-first magnet  610  may be disposed adjacent to the first-second magnet  615 . For example, the first-first magnet  610  may be disposed in direct contact with the first-second magnet  615  in the first groove  2231 . As another example, the first-first magnet  610  may be disposed to be spaced apart from the first-second magnet  615  in the first groove  2231  by a predetermined interval. 
     The first-first magnet  610  and the first-second magnet  615  may be separated from each other. That is, the first-first magnet  610  and the first-second magnet  615  may be a magnet scaler and a single-pole magnet manufactured by being individually magnetized to each other. 
     Also, the first-first magnet  610  and the first-second magnet  615  may be integrally formed with each other. That is, the first-first magnet  610  and the first-second magnet  615  may be an integrated magnet formed by being magnetized at once. 
     In addition, a second groove  2232  may be disposed on the first lower surface  223 . The second groove  2232  may be spaced apart from the first groove  2231 . The second groove  2232  may be disposed in an edge region of the first lower surface  223 . The second groove  2232  may provide a region in which a portion of the first elastic part  230 , which will be described later, is disposed. In detail, the second groove  2232  may provide a region in which the first elastic part  230  is mounted and fixed. 
     The first side surface  222  may be disposed between the first upper surface  221  and the first lower surface  223 . In detail, the first side surface  222  may be a surface connecting the first upper surface  221  and the first lower surface  223 . In more detail, the first side surface  222  may be a surface connecting the second sub upper surface  221   b  and the first lower surface  223 . The first side surface  222  may face a second inner surface  124  of the second housing  120  to be described later. 
     A first recess  2221  may be disposed on the first side surface  222 . The first recess  2221  may have a concave shape in a direction from the first side surface  222  to the first barrel part  210 . Also, the first recess  2221  may have a groove shape extending in the optical axis direction (z-axis direction). The first recess  2221  may have a V-shape when viewed from the front. 
     The first guide part  220  may include a first insertion hole  220   h   1 . The first insertion hole  220   h   1  may be a hole passing through one surface and the other surface of the first guide part  220 . Here, one surface of the first guide part  220  may be a surface facing the first lens part  105 , and the other surface may be a surface opposite to the one surface and facing the image sensor  900 . 
     A first pin  250  may be disposed in the first insertion hole  220   h   1 . The first pin  250  may be disposed to pass through the first insertion hole  220   h   1 . The first pin  250  has a shape extending in the optical axis direction (z-axis direction), and may have a longer optical axis direction length than the first lens barrel  200 . The first pin  250  may be coupled to at least one of the first housing  110  and the second housing  120 . The first lens barrel  200  may move the first pin  250  as a movement axis in the optical axis direction. Through this, the second lens part  205  disposed in the first lens barrel  200  may perform a zoom function and/or an autofocus function. 
     The first elastic part  230  may be disposed on the first guide part  220 . For example, the first elastic part  230  may be disposed on the first upper surface  221 , the first lower surface  223 , and the first side surface  222  of the first guide part  220 . The first elastic part  230  may be coupled to the first guide part  220 . 
     The first elastic part  230  may include a first elastic member  231  and a second elastic member  232 . 
     The first elastic member  231  may be coupled to the first guide part  220 . The first elastic member  231  may be disposed at a set position on the first side surface  222 . 
     The first elastic member  231  may have a shape corresponding to the first side surface  222 . For example, the first elastic member  231  may include a first region  231   a,  a second region  231   b,  and a third region  231   c.    
     The first region  231   a  and the second region  231   b  may be disposed on the first side surface  222  of the first guide part  220  and may be spaced apart from each other. The first region  231   a  and the second region  231   b  may be disposed on a region of the first side surface  222  in which the first recess  2221  is not disposed. 
     The third region  231   c  may be disposed between the first region  231   a  and the second region  231   b  to connect the two regions  231   a  and  231   b.  The third region  231   c  may be disposed in a region corresponding to the first recess  2221 . The third region  231   c  may have a V-shape corresponding to the first recess  2221 . 
     The second elastic member  232  may be disposed on the first guide part  220 . The second elastic member  232  may be coupled to the first guide part  220 . 
     The second elastic member  232  may include a fourth region  232   a,  a fifth region  232   b,  and a sixth region  232   c.    
     The fourth region  232   a  may be disposed on the first upper surface  221  of the first guide part  220 . In detail, the fourth region  232   a  may be disposed on the second sub upper surface  221   b  of the first guide part  220 . 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  232   b  may be connected to the fourth region  232   a.  For example, the fifth region  232   b  may be bent at one end of the fourth region  232   a  and disposed on the first side surface  222  of the first guide part  220 . The fifth region  232   b  may be disposed on the first elastic member  231 . The fifth region  232   b  may be parallel to the first region  231   a  and the second region  231   b.  The fifth region  232   b  may be disposed to cover the first elastic member  231 . 
     The sixth region  232   c  may be connected to the fifth region  232   b.  For example, the sixth region  232   c  may be bent at one end of the fifth region and disposed on the first lower surface  223  of the first guide part  220 . A portion of the sixth region  232   c  may be inserted into the second groove  2232  disposed on the first lower surface  223 . 
     That is, the second elastic member  232  may be physically coupled to the first guide part  220  as the first fixing groove formed in the fourth region  232   a  engages with the first fastening protrusion, the sixth region  232   c  is inserted into the second groove  2232 . Accordingly, the first elastic part  230  may maintain a state firmly coupled to the first guide part  220 . 
     In addition, the first lens barrel  200  may further include a first guide groove ( 210   h   1 ). The first guide groove  210   h   1  may be disposed in a region extending outwardly from the first barrel part  210 . The first guide groove  210   h   1  may be disposed in a region corresponding to a second pin  450  to be described later. The first guide groove  210   h   1  may provide a space into which the second pin  450  is inserted. The first lens barrel  200  may move in the optical axis direction by the first pin  250  and the second pin  450 . In this case, the first guide groove  210   h   1  may have an open shape at one side. For example, the first guide groove  210   h   1  may have an open shape at one side facing the first inner surface of the housing  100 . Accordingly, friction and vibration generated when the first lens barrel  200  is moved by the first driving part  300  can be minimized. 
     The camera actuator  1000  may include a first driving part  300 . The first driving part  300  may be disposed in the housing  100 . The first driving part  300  may be coupled to the first lens barrel  200 . The first driving part  300  may move the first lens barrel  200  in the optical axis direction (z-axis direction). 
     The first driving part  300  may include a first piezoelectric device  310 , a first extension bar  320 , a first buffer member  321 , and a second buffer member  322 . 
     The first piezoelectric device  310  may include a piezo-electric device. For example, the first piezoelectric device  310  may include a material that causes mechanical deformation by an applied voltage. The first piezoelectric device  310  may contract or expand by an applied voltage and may cause mechanical deformation in a set direction. For example, the first piezoelectric device  310  may generate a vibration while causing mechanical deformation in the optical axis direction (z-axis direction) by an applied voltage. 
     The first piezoelectric device  310  may include a first disk portion  311  and a first protrusion  512 . The first disk portion  311  may have a plate shape and may be disposed on the second hole  112 . For example, the first disk portion  311  may be disposed on the first protrusion  112   a  of the second hole  112 . In detail, the first disk portion  311  may be disposed on the plurality of first sub-protrusions. The first protrusion  112   a  may support the first disk portion  311 . 
     The first protrusion  512  may be disposed under the first disk portion  311 . In detail, the first protrusion  512  may be disposed under the first disk portion  311  in the third direction (z-axis direction) and may be connected to the first disk portion  311 . A portion of the first protrusion  512  may be disposed in the second hole  112 . The first protrusion  512  may have a shape protruding toward the image sensor  900 . A width (x-axis, y-axis direction) of the first protrusion  512  may change toward the optical axis direction. For example, the width of the first protrusion  512  may decrease as it approaches the image sensor  900 . 
     The first extension bar  320  may extend in the optical axis direction. The first extension bar  320  may be disposed parallel to the optical axis and may be connected to the first piezoelectric device  310 . For example, an upper end of the first extension bar  320  may be connected to the first protrusion  512 . In addition, the lower end of the first extension bar  320  may be inserted into the lower end of the housing  100 , for example, a fourth hole (not shown) formed at the lower end of the second housing  120 . 
     In addition, one region of the first extension bar  320  may be connected to the first lens barrel  200 . For example, the first extension bar  320  may be connected to the first lens barrel  200  by the first elastic part  230 . In detail, the first extension bar  320  may be disposed between the first elastic member  231  and the second elastic member  232 . In more detail, the first extension bar  320  may be disposed between the third region  231   c  of the first elastic member  231  and the fifth region  232   b  of the second elastic member  232 . The first extension bar  320  may be fixed by the elastic force of the first elastic member  231  and the second elastic member  232 . 
     The first extension bar  320  may transmit the vibration generated by the first piezoelectric device  310  to the first lens barrel  200 . The first lens barrel  200  may move upward or downward (z-axis direction, optical-axis direction) according to the vibration direction of the first extension bar  320 . Through this, the second lens part  205  in the first lens barrel  200  may move to perform a zooming function of zooming up or zooming out. 
     The first buffer member  321  may be disposed on the first extension bar  320 . The first buffer member  321  may be disposed on an upper region of the first extension bar  320 . The first buffer member  321  may be disposed in the second hole  112  of the housing  100 . For example, the first buffer member  321  may be disposed between the first protrusion  112   a  and the second protrusion  112   b  of the second hole  112 . The first buffer member  321  may be fixed to a position set by the first protrusion  112   a  and the second protrusion  112   b.  In addition, the first buffer member  321  may include a through hole into which the first extension bar  320  is inserted. 
     The second buffer member  322  may be disposed on the first extension bar  320 . The second buffer member  322  may be disposed on a lower region of the first extension bar  320 . The second buffer member  322  may be spaced apart from the first buffer member  321  in the optical axis direction. The second buffer member  322  may be disposed in a fourth hole (not shown) of the housing  100 . The second buffer member  322  may be disposed to be inserted into the fourth hole. The second buffer member  322  may include a through hole into which the first extension bar  320  is inserted. 
     The first buffer member  321  and the second buffer member  322  may prevent noise caused by the vibration of the first extension bar  320 . In addition, the first buffer member  321  and the second buffer member  322  may prevent the first extension bar  320  from being deformed or damaged by an external impact. 
     The second lens barrel  400  may be disposed in the housing  100 . The second lens barrel  400  may be disposed in the second housing  120 . The second lens barrel  400  may be disposed under the first lens barrel  200 . For example, the second lens barrel  400  may be disposed below the first lens barrel  200  in the optical axis direction, and may be closer to the image sensor  900  than the first lens barrel  200 . The second lens barrel  400  may be coupled to the second driving part  500 . The second lens barrel  400  may be moved in the housing  100  by the second driving part  500 . In detail, the second lens barrel  400  may be moved in the optical axis direction by the second driving part  500 . 
     The second lens barrel  400  may include a second barrel part  410 , a third lens part  405 , a second guide part  420 , and a second elastic part  430 . 
     The second barrel part  410  is disposed in a region overlapping the optical axis and may have an open shape on one side and the other side. For example, the second barrel part  410  may have a cylindrical shape in which one surface and the other surface are open. 
     The second barrel part  410  may include the second through hole  411 . The second through hole  411  may be a through hole passing through one surface and the other surface of the second barrel part  410 . Here, one surface of the second barrel part  410  may be a surface facing the first lens barrel  200 , and the other surface may be a surface opposite to the one surface and facing the image sensor  900 . 
     The third lens part  405  may be disposed on the second barrel part  410 . In detail, the third lens part  405  may be disposed in the second through hole  411 . For example, a thread may be formed on an inner circumferential surface of the second through hole  411 , and the third lens part  405  may be coupled to the second barrel part  410  by the thread. 
     The third lens part  405  may include at least one lens. The third lens part  405  may perform an auto focus function. The third lens part  405  may move in the optical axis direction. In detail, the third lens part  405  may move in the optical axis direction with respect to the first lens part  105 . The third lens part  405  may move separately from the second lens part  205 . Also, the distance at which the third lens part  405  can move in the optical axis direction may be the same as or different from that of the second lens part  205 . 
     The second guide part  420  may extend outwardly from the second barrel part  410 . For example, the second guide part  420  may extend from the second barrel part  410  in a direction perpendicular to the optical axis, for example, in a first direction (x-axis direction). In this case, the second guide part  420  may extend in a direction opposite to the first guide part  220 . For example, the first guide part  220  may extend in the +x-axis direction from the first barrel part  210 , and the second guide part  420  may extend in the-x-axis direction from the second barrel part  410 . 
     The second guide part  420  may include a second lower surface  421 , a second side surface  422 , and a second upper surface  423 . 
     The second upper surface  423  may face the inner upper surface  122  of the housing  100 . The second upper surface  423  may face the inner upper surface  122  of the housing  100  in the second direction (y-axis direction). A third groove  4231  may be disposed on the second upper surface  423 . The third groove  4231  may have a concave shape in a direction from the second upper surface  423  to the second lower surface  421 . A second magnetic scaler  620  to be described later may be disposed in the third groove  4231 . 
     The third groove  4231  may have a T-shape, but is not limited thereto. A second magnet part  620  and  625  to be described later may be disposed in the third groove  4231 . Specifically, a second-first magnet  620  and a second-second magnet  625 , which will be described later, may be disposed in the third groove  4231 . Accordingly, the third groove  4231  may include a second-first sub groove in which the second-first magnet  620  is disposed and a third-second sub-groove in which the second-second second magnet  625  is disposed. The third-first sub groove and the third-second sub groove may be connected to each other, and differently, they may be partitioned by a partition wall formed in the middle. 
     Meanwhile, although it is illustrated that the third groove  4231  has a T-shape in the drawing and the second magnet parts  620  and  625  are disposed therein, the embodiment is not limited thereto. In detail, the third-second sub groove of the third groove  4231  may be formed to have the same area as the third-first sub groove so as to enlarge the length of the neutral zone around the second-second magnet  615 . For example, the sum of the size of the second-second magnet  625  and the size of the neutral zone of the second-second magnet  615  may be the same as the size of the second-first magnet  620 , and otherwise it may be larger than this. 
     The second-first magnet  620  may be a magnet scaler having a structure in which a plurality of magnets having different polarities are sequentially disposed in a third direction corresponding to the optical axis direction. The second-second magnet  625  may be a reference magnet. The second-second magnet  625  may be a single-pole magnet. In detail, the second-second magnet  625  is a single-pole magnetized magnet, and accordingly, it may be referred to as a ‘single-pole magnet’. In addition, the second-second magnet  625  is provided to move the lens barrel to the initial position as a reference, and accordingly, it may be referred to as a ‘reference magnet’. Hereinafter, the second-second magnet  625  will be described as a single-pole magnet. 
     The second-first magnet  620  may be disposed adjacent to the second-second magnet  625 . For example, the second-first magnet  620  may be disposed in direct contact with the second-second magnet  625  in the third groove  4231 . As another example, the second-first magnet  620  may be disposed to be spaced apart from the second-second magnet  625  in the third groove  4231  by a predetermined interval. 
     The second-first magnet  620  and the second-second magnet  625  may be separated from each other. That is, the second-first magnet  620  and the second-second magnet  625  may be a magnet scaler and a single-pole magnet manufactured by being individually magnetized to each other. 
     Also, the second-first magnet  620  and the second-second magnet  625  may be integrally formed with each other. That is, the second-first magnet  620  and the second-second magnet  625  may be an integrated magnet formed by being magnetized at once. 
     In addition, a fourth groove  4232  may be disposed on the second upper surface  423 . The fourth groove  4232  may be spaced apart from the third groove  4231 . The fourth groove  4232  may be disposed in an edge region of the second upper surface  423 . The fourth groove  4232  may provide a region in which a portion of the second elastic part  430 , which will be described later, is disposed. In detail, the fourth groove  4232  may provide a region in which the second elastic part  430  is mounted and fixed. 
     The second lower surface  421  may face the inner lower surface  121  of the housing  100 . The second lower surface  421  may face the inner lower surface  121  of the housing  100  in the second direction (y-axis direction). The second lower surface  421  may include a plurality of sub lower surfaces. In detail, the second lower surface  421  may include a first sub-lower surface  421   a  and a second sub-lower surface  421   b  disposed above the first sub-lower surface  421   a  in the second direction (y-axis direction). That is, the second sub lower surface  421   b  may be disposed adjacent to the second upper surface  423  than the first sub lower surface  421   a.  At least one second fastening protrusion (not shown) may be disposed on the second sub lower surface  421   b.  The second fastening protrusion may have a shape protruding downward from the second sub-lower surface  421   b.  The second fastening protrusion may be inserted into a second fixing groove (not shown) formed in a second elastic part  430  to be described later. 
     Also, the second lower surface  421  may include a second stepped surface  425  disposed between the first sub lower surface  421   a  and the second sub lower surface  421   b.  The second stepped surface  425  may be connected to ends of the first sub-lower surface  421   a  and the second sub-lower surface  421   b.  The second stepped surface  425  may be defined as the second stepped portion  425 . That is, the second lower surface  421  may include the first sub lower surface  421   a,  the second sub lower surface  421   b,  and the second stepped portion  425  and may have a stepped structure. 
     The second side surface  422  may be disposed between the second upper surface  423  and the second lower surface  421 . In detail, the second side surface  422  may be a surface connecting the second upper surface  423  and the second lower surface  421 . In more detail, the second side surface  422  may be a surface connecting the second sub lower surface  421   b  and the second upper surface  423 . The second side surface  422  may face the first inner surface  123  of the second housing  120  to be described later. 
     A second recess  4421  may be disposed on the second side surface  422 . The second recess  4421  may have a concave shape from the second side surface  422  toward the second barrel part  410 . Also, the second recess  4421  may have a groove shape extending in the optical axis direction (z-axis direction). The second recess  4421  may have a V-shape when viewed from the front. 
     The second guide part  420  may include a second insertion hole  420   h   1 . The second insertion hole  420   h   1  may be a hole passing through one surface and the other surface of the second guide part  420 . Here, one surface of the second guide part  420  may be a surface facing the first lens barrel  200 , and the other surface may be a surface opposite to the one surface and facing the image sensor  900 . 
     A second pin  450  may be disposed in the second insertion hole  420   h   1 . The second pin  450  may be disposed to pass through the second insertion hole  420   h   1 . The second pin  450  may have a shape extending in the optical axis direction (z-axis direction). The second pin  450  may be spaced apart from the first pin  250  and may be parallel to the first pin  250 . The second pin  450  may have a length in the optical axis direction longer than that of the second lens barrel  400 . The second pin  450  may be coupled to at least one of the first housing  110  and the second housing  120 . The second lens barrel  400  may move the second pin  450  as a movement axis in the optical axis direction. Through this, the third lens part  405  disposed in the second lens barrel  400  may perform a zoom function and/or an autofocus function. 
     The second elastic part  430  may be disposed on the second guide part  420 . For example, the second elastic part  430  may be disposed on the second upper surface  423 , the second lower surface  421 , and the second side surface  422  of the second guide part  420 . The second elastic part  430  may be coupled to the second guide part  420 . 
     The second elastic part  430  may include a third elastic member  431  and a fourth elastic member  432 . 
     The third elastic member  431  may be coupled to the second guide part  420 . The third elastic member  431  may be disposed at a set position on the second side surface  422 . 
     The third elastic member  431  may have a shape corresponding to the second side surface  422 . For example, the third elastic member  431  may include a seventh region  431   a,  an eighth region  431   b,  and a ninth region  431   c.    
     The seventh region  431   a  and the eighth region  431   b  may be disposed on the second side surface  422  of the second guide part  420  and may be spaced apart from each other. The seventh region  431   a  and the eighth region  431   b  may be disposed on a region of the second side surface  422  in which the second recess  4221  is not disposed. 
     The ninth region  431   c  may be disposed between the first region  231   a  and the second region  231   b  to connect the two regions  431   a  and  431   b.  The ninth region  431   c  may be disposed in a region corresponding to the second recess  4421 . The ninth region  431   c  may have a V-shape corresponding to the second recess  4421 . 
     The fourth elastic member  432  may be disposed on the second guide part  420 . The fourth elastic member  432  may be coupled to the second guide part  420 . 
     The fourth elastic member  432  may include a tenth region  432   a,  an eleventh region  432   b,  and a twelfth region  432   c.    
     The tenth region  432   a  may be disposed on the second lower surface  421  of the second guide part  420 . In detail, the tenth region  432   a  may be disposed on the second sub lower surface  421   b  of the second guide part  420 . The tenth region 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  432   b  may be connected to the tenth region  432   a.  For example, the eleventh region  432   b  may be bent at one end of the tenth region  432   a  and disposed on the second side surface  422  of the second guide part  420 . The eleventh region  432   b  may be disposed on the third elastic member  431 . The eleventh region  432   b  may be parallel to the seventh region  431   a  and the eighth region  431   b.  The eleventh region  432   b  may be disposed to cover the third elastic member  431 . 
     The twelfth region  432   c  may be connected to the eleventh region  432   b.  For example, the twelfth region  432   c  may be bent at one end of the eleventh region and disposed on the second upper surface  423  of the second guide part  420 . A portion of the twelfth region  432   c  may be inserted into the second groove  2232  disposed on the second upper surface  423 . 
     That is, the fourth elastic member  432  may be physically coupled to the second guide part  420  as the twelfth region  432   c  is inserted into the fourth groove  4232  while the second fixing groove formed in the seventh region  431   a  is coupled to the second fastening protrusion. 
     In addition, the second lens barrel  400  may further include a second guide groove  4221 . The second guide groove  4221  may be disposed in a region extending outwardly from the second barrel part  410 . The second guide groove  4221  may be disposed in a region corresponding to the first pin  250 . The second guide groove  4221  may provide a space into which the first pin  250  is inserted. The second lens barrel  400  may move in the optical axis direction by the first pin  250  and the second pin  450 . In this case, the second guide groove  4221  may have an open shape at one side. For example, the second guide groove  4221  may have an open side facing the second inner surface of the housing  100 . Accordingly, friction and vibration generated when the second lens barrel  400  is moved by the second driving part  500  can be minimized. 
     The camera actuator  1000  may include a second driving part  500 . The second driving part  500  may be disposed in the housing  100 . The second driving part  500  may be coupled to the second lens barrel  400 . The second driving part  500  may move the second lens barrel  400  in the optical axis direction (z-axis direction). 
     The second driving part  500  may include a second piezoelectric device  510 , a second extension bar  520 , a third buffer member  521 , and a fourth buffer member  522 . 
     The second piezoelectric device  510  may include a piezo-electric device. For example, the second piezoelectric device  510  may include a material that causes mechanical deformation by an applied voltage. The second piezoelectric device  510  may contract or expand by an applied voltage and may cause mechanical deformation in a set direction. For example, the second piezoelectric device  510  may generate vibration while causing mechanical deformation in the optical axis direction (z-axis direction) by an applied voltage. 
     The second piezoelectric device  510  may include a second disk portion  511  and a second protrusion portion  512 . The second disk portion  511  has a plate shape and may be disposed on the third hole  113 . For example, the second disk portion  511  may be disposed on the third protrusion  113   a  of the third hole  113 . 
     In detail, the second disk portion  511  may be disposed on the plurality of third sub-protrusions. The third protrusion  113   a  may support the second disc portion  511 . 
     The second protrusion  512  may be disposed under the second disk portion  511 . In detail, the second protrusion  512  may be disposed under the second disk portion  511  in the third direction (z-axis direction) and may be connected to the second disk portion  511 . A portion of the first protrusion  512  may be disposed in the third hole  113 . The second protrusion  512  may have a shape protruding toward the image sensor  900 . The width (x-axis, y-axis direction) of the second protrusion  512  may change toward the optical axis direction. For example, the width of the second protrusion  512  may decrease as it approaches the image sensor  900 . 
     The second extension bar  520  may extend in the optical axis direction. The second extension bar  520  may be disposed parallel to the optical axis and may be connected to the second piezoelectric device  510 . For example, an upper end of the second extension bar  520  may be connected to the second protrusion  512 . In addition, the lower end of the second extension bar  520  may be inserted into the lower end of the housing  100 , for example, a fifth hole (not shown) formed at the lower end of the second housing  120 . 
     In addition, one region of the second extension bar  520  may be connected to the second lens barrel  400 . For example, the second extension bar  520  may be connected to the second lens barrel  400  by the second elastic part  430 . In detail, the second extension bar  520  may be disposed between the third elastic member  431  and the fourth elastic member  432 . In more detail, the second extension bar  520  may be disposed between the ninth region  431   c  of the third elastic member  431  and the eleventh region  432   b  of the fourth elastic member  432 . The second extension bar  520  may be fixed by the elastic force of the third elastic member  431  and the fourth elastic member  432 . 
     The second extension bar  520  may transmit the vibration generated by the second piezoelectric device  510  to the second lens barrel  400 . The second lens barrel  400  may move upward or downward (z-axis direction, optical-axis direction) according to the vibration direction of the second extension bar  520 . Through this, the third lens part  405  in the second lens barrel  400  may move to perform a zooming function of zooming up or out. 
     The third buffer member  521  may be disposed on the second extension bar  520 . The third buffer member  521  may be disposed on an upper region of the second extension bar  520 . The third buffer member  521  may be disposed in the third hole  113  of the housing  100 . For example, the third buffer member  521  may be disposed between the third protrusion  113   a  and the fourth protrusion  1134  of the third hole  113 . The third buffer member  521  may be fixed to a position set by the third protrusion  113   a  and the fourth protrusion  1134 . In addition, the third buffer member  521  may include a through hole into which the second extension bar  520  is inserted. 
     The fourth buffer member  522  may be disposed on the second extension bar  520 . The fourth buffer member  522  may be disposed on a lower region of the second extension bar  520 . The fourth buffer member  522  may be spaced apart from the third buffer member  521  in the optical axis direction. The fourth buffer member  522  may be disposed in a fifth hole (not shown) of the housing  100 . The fourth buffer member  522  may be disposed to be inserted into the fifth hole. The second buffer member  322  may include a through hole into which the second extension bar  520  is inserted. 
     The third buffer member  521  and the fourth buffer member  522  may prevent noise caused by the vibration of the second extension bar  520 . In addition, the third buffer member  521  and the fourth buffer member  522  may prevent the second extension bar  520  from being deformed or damaged by an external impact. 
     The camera actuator  1000  may include a first sensing part  830 , a first magnet part  610  and  615 , a second sensing part  840 , and a second magnet part  620  and  625 . 
     The first magnet part  610  and  615  may include a first-first magnet  610  and a first-second magnet  615 . As described above, the first-first magnet  610  is a magnet scaler. Also, the first-second magnets  615  are reference magnets, which may also be single-pole magnetized single-pole magnets. 
     Hereinafter, for convenience of description, the first-first magnet  610  will be referred to as a first magnet scaler  610 , and the first-second magnet  615  will be described as a first single-pole magnet  615 . In addition, the first magnet part  610  and  615  are disposed on the first lens barrel  200  to move together with the first lens barrel  200 , and accordingly, it may be referred to as a ‘moving part’. 
     The first magnet scaler  610  may be disposed on the first lens barrel  200 . For example, the first magnet scaler  610  may be disposed on the first lower surface  223 . In detail, the first magnet scaler  610  may be disposed in the first groove  2231  of the first lens barrel  200 . For example, the first groove  2231  may include a first-first sub groove and a first-second sub groove. In addition, the first magnet scaler  610  may be disposed in the first-first sub groove of the first groove  2231 . 
     The first magnet scaler  610  may move along the optical axis direction together with the first lens barrel  200 . 
     The first magnet scaler  610  may include a plurality of magnets. For example, the first magnet scaler  610  may have an N pole and an S pole alternately disposed in the optical axis direction. 
     The first single-pole magnet  615  may be disposed on the first lens barrel  200 . For example, the first single-pole magnet  615  may be disposed on the first lower surface  223  together with the first magnet scaler  610 . In detail, the first single-pole magnet  615  may be disposed in the first groove  2231  of the first lens barrel  200  together with the first magnet scaler  610 . For example, the first groove  2231  may include a first-first sub groove and a first-second sub groove. In addition, the first single-pole magnet  615  may be disposed in the first-second sub groove of the first groove  2231 . 
     The first single-pole magnet  615  may move along the optical axis direction together with the first lens barrel  200  like the first magnet scaler  610 . 
     The first single-pole magnet  615  may include one single magnet. For example, the first single-pole magnet  615  may be a single-pole magnet in which an N pole and an S pole are disposed in a direction perpendicular to the optical axis direction. 
     Also, the first single-pole magnet  615  may be a magnet including a neutral zone. Here, the neutral zone of the first single-pole magnet  615  may be formed in a direction parallel to the optical axis direction, but is not limited thereto. Here, the neutral zone means the interface between the N pole and the S pole of the magnet. The neutral zone of the first single-pole magnet  615  may be formed through a magnetization process. The magnetization process refers to the process of making a ferromagnetic material, not a magnet, into a magnet, and it refers to making a permanent magnet by applying a strong external magnetic field to a ferromagnetic material to be manufactured as a magnet. When the magnetization process is performed, the surface in contact with the magnetization applying an external magnetic field becomes the N pole (or S pole), and the other side automatically becomes the S pole (N pole). At this time, the automatically generated boundary between the N pole and the S pole is called a neutral zone. 
     The first sensing part  830  may be disposed adjacent to the first magnet scaler  610  and the first single-pole magnet  615 . For example, the first sensing part  830  may be disposed to face the first magnet scaler  610  in a first direction (x-axis direction) or a second direction (y-axis direction). Specifically, the first sensing part  830  may be disposed to face the first magnet scaler  610  and the first single-pole magnet  615  in the second direction (y-axis direction). As will be described later, the first sensing part  830  is disposed on the substrate  800 . In this case, the substrate  800  may be disposed to surround a partial region of the housing  100 . In this case, the substrate  800  may be disposed to surround a region overlapping a region where the first magnet scaler  610  and the single-pole magnet  615  are disposed in the second direction. 
     Specifically, the second housing  120  may include a first hole  126  formed in a region overlapping a region where the first magnet scaler  610  and the first single-pole magnet  615  are disposed in the second direction. That is, the second housing  120  may include a first hole  126  corresponding to the first magnet scaler  610  and the first single-pole magnet  615 . 
     In addition, the substrate  800  may be disposed to cover the first hole  126 . In this case, the first sensing part  830  may be disposed in a region of the substrate  800  corresponding to the first hole  126 . Specifically, the first sensing part  830  disposed on the substrate  800  may be positioned in the first hole  126 . That is, the first sensing part  830  may be disposed to face the first magnet scaler  610  and the first single-pole magnet  615  through the first hole  126 . 
     The first sensing part  830  may sense the position of the first magnet scaler  610  and the position of the first single-pole magnet  615 . Accordingly, the first sensing part  830  may sense the position and movement of the first lens barrel  200  moving together with the first magnet scaler  610  and the first single-pole magnet  615 . 
     The first magnet scaler  610  may have a length corresponding to a stroke of the first lens barrel  200 . For example, the first magnet scaler  610  may sense the current position of the first lens barrel  200  through the first sensing part  830  within the stroke of the first lens barrel  200 . 
     The second magnet part  620  and  625  may include a second-first magnet  620  and a second-second magnet  625 . As described above, the second-first magnet  620  may be a magnet scaler, and the second-second magnet  615  may be a single-pole magnet, but is not limited thereto. In addition, the second magnet part  620  and  625  is disposed on the second lens barrel  400  to move together with the second lens barrel  400 , and accordingly, it may be referred to as a ‘moving part’. 
     Hereinafter, for convenience of description, the second-first magnet  620  will be referred to as a second magnet scaler  620 , and the second-second magnet  625  will be described as a second single-pole magnet  625 . 
     The second magnet scaler  620  may be disposed on the second lens barrel  400 . 
     For example, the second magnet scaler  620  may be disposed on the second upper surface  423 . In detail, the second magnet scaler  660  may be disposed in the third groove  4231  of the second lens barrel  400 . For example, the third groove  4231  may include a third-first sub groove and a third-second sub groove. In addition, the second magnet scaler  620  may be disposed in the third-first sub groove of the third groove  4231 . 
     The second magnet scaler  620  may move along the optical axis direction together with the second lens barrel  400 . 
     The second magnet scaler  620  may include a plurality of magnets. For example, the second magnet scaler  620  may have an N pole and an S pole alternately disposed in the optical axis direction. 
     The second single-pole magnet  625  may be disposed on the second lens barrel  400 . For example, the second single-pole magnet  625  may be disposed on the second upper surface  423  together with the second magnet scaler  620 . In detail, the second single-pole magnet  625  may be disposed in the third groove  4231  of the second lens barrel  400  together with the second magnet scaler  620 . For example, the second single-pole magnet  625  may be disposed in the third-second sub-groove of the third groove  4231 . 
     The second single-pole magnet  625  may move along the optical axis direction together with the second lens barrel  400  like the second magnet scaler  620 . 
     The second single-pole magnet  625  may include one single magnet. For example, the second single-pole magnet  625  may be a single-pole magnet in which an N pole and an S pole are disposed in a second direction (y-axis direction) perpendicular to the optical axis direction. 
     Also, the second single-pole magnet  625  may be a magnet including a neutral zone. Here, the neutral zone of the second single-pole magnet  625  may be formed in a direction parallel to the optical axis direction, but is not limited thereto. Here, the neutral zone means the interface between the N pole and the S pole of the magnet. The neutral zone of the second single-pole magnet  625  may be formed through a magnetization process. Magnetization process refers to the process of making a ferromagnetic material, not a magnet, into a magnet, and it refers to making a permanent magnet by applying a strong external magnetic field to a ferromagnetic material to be manufactured as a magnet. When the magnetization process is performed, the surface in contact with the magnetization applying an external magnetic field becomes the N pole (or S pole), and the other side automatically becomes the S pole (N pole). At this time, the automatically generated boundary between the N pole and the S pole is called a neutral zone. 
     The second sensing part  840  may be disposed adjacent to the second magnet scaler  620  and the second single-pole magnet  625 . For example, the second sensing part  840  may be disposed to face the second magnet scaler  620  in a first direction (x-axis direction) or a second direction (y-axis direction). Also, the second sensing part  840  may be disposed to face the second single-pole magnet  625  in a first direction (x-axis direction) or a second direction (y-axis direction). 
     Specifically, the second sensing part  840  may be disposed to face the second magnet scaler  620  and the second single-pole magnet  625  in the second direction (y-axis direction). As will be described later, the second sensing part  840  is disposed on the substrate  800 . In this case, the substrate  800  may be disposed to surround a partial region of the housing  100 . In this case, the substrate  800  may be disposed to surround a region overlapping a region where the second magnet scaler  620  and the single-pole magnet  625  are disposed in the second direction. 
     Specifically, the second housing  120  may include a second hole  127  formed in a region overlapping a region in which the second magnet scaler  620  and the second single-pole magnet  625  are disposed in the second direction. That is, the second housing  120  may include a second hole  127  corresponding to the second magnet scaler  620  and the second single-pole magnet  625 . 
     In addition, the substrate  800  may be disposed to cover the second hole  127 . In this case, the second sensing part  840  may be disposed in a region of the substrate  800  corresponding to the second hole  127 . Specifically, the second sensing part  840  disposed on the substrate  800  may be position in the second hole  127 . The second sensing part  840  may be disposed to face the second magnet scaler  620  and the second single-pole magnet  625  through the second hole  127 . 
     The second sensing part  840  may sense the position of the second magnet scaler  620  and the position of the second single-pole magnet  625 . Accordingly, the second sensing part  840  may sense the position and movement of the second lens barrel  400  moving together with the second magnet scaler  620  and the second single pole magnet  625 . 
     The second magnet scaler  620  may have a length corresponding to the stroke of the second lens barrel  400 . For example, the second magnet scaler  620  may sense the current position of the second lens barrel  400  through the second sensing part  840  in the stroke of the second lens barrel  400 . 
     Meanwhile, as described above, the first magnet scaler  610  and the first single pole magnet  615  are disposed in the first lens barrel  200 . 
     In addition, the second magnet scaler  620  and the second single pole magnet  625  are disposed in the second lens barrel  400 . 
     The first magnet scaler  610  may be provided to sense a position of the first lens barrel  200  in a movement stroke of the first lens barrel  200 . 
     The second magnet scaler  620  may be provided to sense a position of the second lens barrel  400  in a movement stroke of the second lens barrel  400 . 
     The first single-pole magnet  615  may be provided to sense the initial position of the first lens barrel  200 . That is, the first single-pole magnet  615  may be disposed in a region corresponding to the initial position of the first lens barrel  200 . 
     The second single pole magnet  625  may be provided to sense the initial position of the second lens barrel  400 . That is, the second single-pole magnet  625  may be disposed in a region corresponding to the initial position of the second lens barrel  400 . 
     A position sensing operation of the first lens barrel  200  using the first magnet scaler  610  and the first single pole magnet  615  and a position sensing operation of the second lens barrel  400  using the second magnet scaler  620  and the second single pole magnet  625  will be described in more detail below. 
     In addition, the first magnet scaler  610  and the first single pole magnet  615  are disposed on one surface of the first lens barrel  200 . In addition, the second magnet scaler  620  and the second single-pole magnet  625  are disposed on the other surface of the second lens barrel. In detail, the first magnet scaler  610  and the first single-pole magnet  615  may be disposed on an upper surface or a lower surface of the first lens barrel  200 . In addition, the second magnet scaler  620  and the second single pole magnet  625  may be disposed on a lower surface or an upper surface of the first lens barrel  200  that is opposite to a surface on which the first magnet scaler  610  and the first single-pole magnet  615  are disposed. For example, as shown in the drawings, the first magnet scaler  610  and the first single-pole magnet  615  may be disposed on a lower surface of the first lens barrel  200 . In addition, the second magnet scaler  620  and the second single pole magnet  625  may be disposed on an upper surface of the second lens barrel. Accordingly, in the embodiment, it is possible to minimize the interference between the first magnet scaler  610 , the first single-pole magnet  615 , the second magnet scaler  620 , and the second single-pole magnet  625 , and, thus the positions of the first lens barrel  200  and the second lens barrel  400  can be accurately measured. 
     Also, although not shown in the drawings, the camera actuator  1000  according to the embodiment may further include a gyro sensor (not shown). The gyro sensor may be disposed in the housing  100 . The gyro sensor may detect a movement of a user using the camera actuator. 
     The camera actuator  1000  according to the embodiment may include a substrate  800 . The substrate  800  may be disposed on the housing  100 . The substrate  800  may be disposed to surround a partial region of the housing  100 . For example, the substrate  800  may be disposed to surround a portion of the outer side of the second housing  120 . The substrate  800  may provide power or current to components disposed in the housing  100 . That is, the substrate  800  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 substrate  800  may include a first end  810 . The first end  810  may be disposed on the first piezoelectric device  310  of the first driving part  300 . For example, the first end  810  may be disposed on the first disk portion  311  of the first piezoelectric device  310 . In detail, the first end  810  may be disposed on one surface of the first disk portion  311 . Also, the first end  810  may be disposed on the second piezoelectric device  510  of the second driving part  500 . For example, the second end  820  may be disposed on the second disk portion  511  of the second piezoelectric device  510 . In detail, the first end  810  may be disposed on one surface of the second disc portion  511 . 
     The substrate  800  may include a second end  820 . The first end  810  may be spaced apart from the first end  810 . Also, the second end  820  may be disposed in a region that does not overlap the first end  810  in the optical axis direction. 
     The second end  820  may be disposed on the first piezoelectric device  310  of the first driving part  300 . For example, the second end  820  may be disposed on the first disk portion  311  of the first piezoelectric device  310 . In detail, the first end  810  may be disposed on the other surface opposite to one surface of the first disk portion  311 . Also, the second end  820  may be disposed on the second piezoelectric device  510  of the second driving part  500 . For example, the second end  820  may be disposed on the second disk portion  511  of the second piezoelectric device  510 . In detail, the second end  820  may be disposed on the other surface opposite to one surface of the second disk portion  511 . 
     That is, the substrate  800  may supply power to the first piezoelectric device  310  and the second piezoelectric device  510 . Accordingly, the first driving part  300  and the second driving part  500  may drive the first lens barrel  200  and the second lens barrel  400  by the applied power, respectively. 
     A driver IC (not shown) may be disposed on the substrate  800 . The driver IC may control the operations of the first driving part  300  and the second driving part  500 . Specifically, the driver IC may control intensity or polarity of power supplied to the first piezoelectric device  310  and the second piezoelectric device  310 . 
     That is, the driver IC may control the first driving part  300  to move the first lens barrel  200  in a -optic axis direction or a +optic axis direction based on the initial position. In addition, the driver IC may control the second driving part  500  to move the second lens barrel  400  in the − optical axis direction or + optical axis direction based on the initial position. 
     Meanwhile, the driver IC may control the first driving part  300  and the second driving part  500  according to the sensing signal sensed through the first sensing part  830  and the second sensing part  840 . 
     First, the driver IC allows the first sensing part  830  to acquire a first sensing signal by the magnetic force generated from the first single-pole magnet  615 . In addition, the driver IC may control the first driving part  300  to move the first lens barrel  200  to an initial position using the first sensing signal. That is, as the first lens barrel  200  moves, the first single-pole magnet  615  also moves. Accordingly, a difference occurs in the first sensing signal acquired through the first sensing part  830  according to the position of the first lens barrel  200 . Accordingly, the driver IC may store a first reference value for the first sensing signal corresponding to the initial position of the first lens barrel  200 . In addition, the driver IC may move the position of the first lens barrel  200  so that a first sensing signal corresponding to the first reference value is received through the sensing part  830 . 
     In addition, the driver IC allows the first sensing part  830  to acquire a second sensing signal by the magnetic force generated from the first magnet scaler  610 . In addition, the driver IC may control the first driving part  300  to move the first lens barrel  200  to a target position using the second sensing signal. A difference occurs in the second sensing signal acquired through the first sensing part  830  according to the position of the first lens barrel  200 . Accordingly, the driver IC may control the first driving part  300  using a second reference value for a second sensing signal corresponding to the target position of the first lens barrel  200 . 
     In addition, the driver IC allows the second sensing part  840  to acquire a third sensing signal by the magnetic force generated from the second single-pole magnet  625 . In addition, the driver IC may control the second driving part  500  to move the second lens barrel  400  to an initial position using the third sensing signal. That is, as the second lens barrel  400  moves, the second single-pole magnet  625  also moves. Accordingly, a difference occurs in the third sensing signal acquired through the second sensing part  840  according to the position of the second lens barrel  400 . Accordingly, the driver IC may store a third reference value for a third sensing signal corresponding to the initial position of the second lens barrel  400 . In addition, the driver IC may move the position of the second lens barrel  400  so that a second sensing signal corresponding to the third reference value is received through the second sensing part  840 . 
     In addition, the driver IC allows the second sensing part  840  to acquire a fourth sensing signal by the magnetic force generated from the second magnet scaler  620 . In addition, the driver IC may control the second driving part  500  to move the second lens barrel  400  to a target position using the fourth sensing signal. A difference occurs in the fourth sensing signal acquired through the second sensing part  840  according to the position of the second lens barrel  400 . Accordingly, the driver IC may control the first driving part  300  to a position at which a fourth sensing signal corresponding to the fourth reference value is received based on the fourth reference value corresponding to the target position of the second lens barrel  400 . 
     The camera actuator  1000  according to the embodiment may include an image sensor  900 . The image sensor  900  may collect light passing in the order of the first lens part  105 , the second lens part  205 , and the third lens part  405  and convert it into an image. The image sensor  900  may be disposed to coincide with the optical axis of the lenses of the lens parts  105 ,  205 , and  405 . The optical axis of the image sensor  900  and the optical axis of the lens may be aligned. 
       FIG.  9    is an exploded perspective view of the housing according to the embodiment, and  FIG.  10    is a front view of the second housing according to the embodiment. The housing  100  according to the embodiment will be described in more detail with reference to  FIGS.  9  and  10   . 
     The housing  100  may have upper and lower partial regions open, and may include an accommodating space therein. The housing  100  may include a first housing  110  and a second housing  120 . The first housing  110  and the second housing  120  may be coupled to each other to form an accommodating space therein, and may be provided in a separable structure. 
     The first housing  110  may accommodate the first lens part  105 . For example, the first lens part  105  may be disposed in the first hole  111  of the first housing  110 . In addition, the first lens barrel  200  and the second lens barrel  400  may be disposed inside the second housing  120 . 
     The second housing  120  may include an inner lower surface  121 , an inner upper surface  122 , a first inner surface  123 , and a second inner surface  124 . 
     The inner lower surface  121  of the second housing  120  may be a surface facing the first lower surface  223  of the first lens barrel  200  and the second lower surface  421  of the second lens barrel  400 . The inner lower surface  121  may be a surface facing the second stepped portion  425 . 
     The inner upper surface  122  may face the inner lower surface  121  in the second direction (y-axis direction). The inner upper surface  122  of the second housing  120  may be a surface facing the first upper surface  221  of the first lens barrel  200  and the second upper surface  423  of the second lens barrel  400 . The inner upper surface  122  may be a surface facing the first stepped portion  225 . 
     The first inner surface  123  of the second housing  120  may be disposed between the inner lower surface  121  and the inner upper surface  122 . The first inner surface  123  may connect one end of the inner lower surface  121  and one end of the inner upper surface  122 . The first inner surface  123  of the second housing  120  may face a side portion of the second lens barrel  400 . For example, the first inner surface  123  may be a surface facing the second side surface  422  of the second lens barrel  400 . In detail, the first inner surface  123  may face the eleventh region  432   b  of the fourth elastic member  432 . 
     The second inner surface  124  of the second housing  120  may be disposed between the inner lower surface  121  and the inner upper surface  122 . The second inner surface  124  may connect the other end of the inner lower surface  121  and the other end of the inner upper surface  122 . The second inner surface  124  may face the first inner surface  123  in a first direction (x-axis direction). The second inner surface  124  of the second housing  120  may face a side portion of the first lens barrel  200 . For example, the second inner surface  124  may be a surface facing the first side surface  222  of the first lens barrel  200 . In detail, the second inner surface  124  may face the fifth region  232   b  of the second elastic member  232 . 
     The second housing  120  may include a guide jaw  125 . The guide jaw  125  may be disposed on the inner lower surface  121 . The guide jaw  125  has a shape that protrudes from the inner lower surface  121  toward the inner upper surface  122  and may extend in the optical axis direction. 
     An optical axis direction length of the guide jaw  125  may be the same as an optical axis direction length of the inner lower surface  121 . In this case, the guide jaw  125  may extend in the optical axis direction from the boundary of the inner lower surface  121  connected to the first housing  110  to the end of the inner lower surface  121 . 
     Also, the optical axis direction length of the guide jaw  125  may be shorter than the optical axis direction length of the inner lower surface  121 . In this case, the guide jaw  125  may extend from the boundary of the inner lower surface  121  in the optical axis direction, and may be spaced apart from the end of the inner lower surface  121 . 
     The guide jaw  125  may be disposed adjacent to the second driving part  500  than the first driving part  300 . In addition, the guide jaw  125  may be disposed closer to the second pin  450  than the first pin  250 . 
     Also, the second housing  120  may include a first hole  126  and a second hole  127 . 
     The first hole  126  may be an arrangement in which the first sensing part  830  disposed on the substrate  800  is disposed. 
     Specifically, the first hole  126  may correspond to the first magnet scaler  610  and the first single-pole magnet  615  of the first lens barrel  200  disposed in the second housing  120 . Accordingly, the first hole  126  may be formed to correspond to a region in which the first magnet scaler  610  and the first single-pole magnet  615  are disposed. For example, the first hole  126  may be formed in the inner lower surface  121  of the second housing  120 . Specifically, the first hole  126  may be formed in a region overlapping the first magnet scaler  610  and the first single-pole magnet  615  in the y-axis of the inner lower surface  121 . In addition, the substrate  800  is disposed to cover the first hole  126 . In this case, the first sensing part  830  may be disposed on the substrate  800 , and at least a portion of the first sensing part  830  may be positioned in the first hole  126 . Accordingly, the first sensing part  830 , the first magnet scaler  610 , and the first single-pole magnet  615  may be disposed to face each other through the first hole  126 . 
     The second hole  127  may be an arrangement in which the second sensing part  840  disposed on the substrate  800  is disposed. 
     Specifically, the second hole  127  may correspond to the second magnet scaler  620  and the second single pole magnet  625  of the second lens barrel  400  disposed in the second housing  120 . Accordingly, the second hole  127  may be formed to correspond to a region in which the second magnet scaler  620  and the second single-pole magnet  625  are disposed. For example, the second hole  127  may be formed in the inner upper surface  122  of the second housing  120 . Specifically, the second hole  127  may be formed in a region overlapping the second magnet scaler  620  and the second single-pole magnet  625  in the y-axis of the inner upper surface  122 . In addition, the substrate  800  is disposed to cover the second hole  127 . In this case, the second sensing part  840  may be disposed on the substrate  800 , and at least a portion of the second sensing part  840  may be positioned in the second hole  127 . Accordingly, the second sensing part  840 , the second magnet scaler  620 , and the second single-pole magnet  625  may be disposed to face each other through the second hole  127 . 
       FIG.  11    is a front view of a second driving part disposed in a second housing according to an exemplary embodiment,  FIG.  12    is a front view in which first and second driving parts are disposed in a second housing according to an embodiment, and  FIG.  13    is a view showing first and second driving parts according to an embodiment. 
     Specifically,  FIGS.  11  and  12    are views illustrating a state in which the first driving part, the second driving part, the first lens barrel, and the second lens barrel are disposed in the second housing and the substrate  800  is disposed on the outer circumferential surface of the second housing. 
     Referring to  FIGS.  11  to  13   , the first lens barrel  200  and the second lens barrel  400  may be disposed in the housing  100 . 
     For example, when manufacturing the camera actuator  1000  according to the embodiment, the second lens barrel  400  may be inserted into the second housing  120  before the first lens barrel  200  as shown in  FIG.  11   . In this case, the second lens barrel  400  may be disposed at a position set by the first pin  250  and the second pin  450 . 
     In detail, the second lens barrel  400  may be disposed so that the second lower surface  421  faces the inner lower surface  121 , and the second upper surface  423  may be disposed to face the inner upper surface  122 . In addition, the second lens barrel  400  may be disposed so that the second side surface  422  faces the first inner surface  123 , and the second guide groove  4221  may be disposed to face the second inner surface  124 . That is, the second stepped portion  425  of the second lens barrel  400  may face the inner lower surface  121 . 
     The guide jaw  125  may guide the second lens barrel  400 . To this end, the guide jaw  125  may be positioned in a region corresponding to the second lens barrel  400 . For example, the guide jaw  125  may be disposed in a region corresponding to the second lower surface  421  and the second stepped portion  425  of the second lens barrel  400 . In detail, the guide jaw  125  may be disposed in a region overlapping the second sub lower surface  421   b  of the second lens barrel  400  in the second direction (y-axis direction), and may be disposed in a region that does not overlap the first sub lower surface  421   a.    
     In this case, the upper surface of the guide jaw  125  may be positioned above the first sub lower surface  421   a  in the second direction (y-axis direction). Also, the upper surface of the guide jaw  125  may be disposed to face the second sub lower surface  421   b.  In this case, the upper surface of the guide jaw  125  may be disposed in contact with the second sub lower surface  421   b,  or may be spaced apart from each other by a predetermined interval. 
     In addition, one side of the guide jaw  125  may be disposed to face the second stepped portion  425  in the first direction (x-axis direction). At this time, one side of the guide jaw  125  may be disposed in contact with the second stepped portion  425  or may be spaced apart from each other by a predetermined interval. 
     In detail, the second lens barrel  400  may include a first distance d 1 . Here, the first distance d 1  may be defined as a distance from one side of the second lens barrel  400  to the second stepped portion  425 . In detail, the first distance d 1  may be defined as a distance in the first direction (x-axis direction) from the second side surface  422  to the second stepped portion  425 . The first distance d 1  may be greater than or equal to a distance in the first direction from the second side surface  422  to the guide jaw  125 . For example, when the first distance d 1  is the same as the distance from the second side surface  422  to the guide jaw  125 , the guide jaw  125  may come into contact with the first stepped portion  225 . 
     In addition, when the first distance d 1  is longer than the distance from the second side surface  422  to the guide jaw  125 , the guide jaw  125  may be spaced apart from the first stepped portion  225  by a predetermined distance. In this case, the driving friction of the second lens barrel  400  may be reduced. 
     Alternatively, when the first distance d 1  is shorter than the distance from the second side surface  422  to the guide jaw  125 , the second lens barrel  400  may not be inserted into the second housing  120 . In detail, in the above-described case, the guide jaw  125  may be positioned in a region corresponding to the first sub lower surface  421   a.  Accordingly, the second lens barrel  400  may not be inserted into the second housing  120  by the guide jaw  125 . 
     That is, the second lens barrel  400  preferably satisfies the first distance d 1  in the above-described range. Accordingly, the second lens barrel  400  can be effectively inserted in the manufacturing process, and the driving friction between the guide jaw  125  and the second lens barrel  400  may be minimized when the second lens barrel  400  is driven. 
     In addition, the first lens barrel  200  may be inserted and disposed after the second lens barrel  400  is first disposed in the housing  100  as shown in  FIG.  12   . In this case, the first lens barrel  200  may be disposed at a position set by the first pin  250  and the second pin  450 . 
     In detail, the first lens barrel  200  may be disposed so that the first lower surface  223  faces the inner lower surface  121 , and the first upper surface  221  may be disposed to face the inner upper surface  122 . In addition, in the first lens barrel  200 , the first side surface  222  may be disposed to face the second inner surface  124 , and the first guide groove  210   h   1  may be disposed to face the first inner surface  123 . That is, the first stepped portion  225  may face the inner upper surface  122 . 
     The guide jaw  125  may be spaced apart from the first lens barrel  200 . For example, the first lens barrel  200  may be disposed in a region that does not correspond to the guide jaw  125 . In detail, the first lens barrel  200  may not overlap the guide jaw  125  in the second direction (y-axis direction). Accordingly, the first lens barrel  200  may be inserted without being caught in the guide jaw  125  during the process of disposing it in the housing  100 . 
     The first lens barrel  200  may include a second distance d 2 . Here, the second distance d 2  may be defined as a distance from one side of the first lens barrel  200  to the first stepped portion  225 . In detail, the first distance d 1  may be defined as a distance in the first direction (x-axis direction) from the first side surface  222  to the first stepped portion  225 . 
     In this case, the first distance d 1  and the second distance d 2  may be different from each other. In detail, the first distance d 1  may be longer than the second distance d 2 . Also, the second distance d 2  may be shorter than a distance in the first direction from the second side surface  422  to the guide jaw  125 . Accordingly, it is possible to prevent the first lens barrel  200  from being first inserted and disposed at the position of the second lens barrel  400 . 
     In detail, the first lens barrel  200  and the second lens barrel  400  may have the same or similar appearance to each other. For this reason, in the process of manufacturing the camera actuator, the first lens barrel  200  is mistaken for the second lens barrel  400 , and is first inserted into the second lens barrel  400  position and assembled. Accordingly, there is a problem in that an optical characteristic of the camera actuator  1000  is changed and a defect occurs. 
     However, the first lens barrel  200  and the second lens barrel  400  according to the embodiment may include a first stepped portion  225  and a second stepped portion  425 . In addition, the first lens barrel  200  and the second lens barrel  400  may be included a first distance d 1  and a second distance d 2  different from each other by the first stepped portion  225  and the second stepped portion  425 . The distance d 2 . 
     In addition, the housing  100  according to the embodiment may include a guide jaw  125  disposed on the inner lower surface  121 . In this case, the guide jaw  125  may be disposed at a position corresponding to the second stepped portion  425 . In addition, the guide jaw  125  may have a distance characteristic corresponding to the first distance d 1 . 
     Accordingly, the second lens barrel  400  can be effectively inserted into the housing  100  in the process of assembling the first lens barrel  200  and the second lens barrel  400 . In addition, it is possible to prevent the first lens barrel  200  from being mistakenly mistaken for the second lens barrel  400  to be preferentially disposed at the second lens barrel  400  position during the assembling process. 
     In detail, the second distance d 2  may be shorter than the first distance d 1 . Accordingly, when the first lens barrel  200  is first inserted into the position of the second lens barrel  400 , the first sub upper surface  221   a  of the first lens barrel  200  may be in contact with the guide jaw  125 . That is, the first lens barrel  200  may be caught on the guide jaw  125  so that insertion into the second housing  120  may not be possible. 
     That is, in the embodiment, the second lens barrel  400  can be easily disposed in the process of manufacturing the camera actuator  1000 , and it is possible to prevent the first lens barrel  200  from being inserted in reverse and misplaced. Accordingly, the embodiment may reduce defects due to misplacement and may have improved process efficiency. 
     Meanwhile, each of the first sensing part  830  and the second sensing part  840  in an embodiment may be configured as a single unit. That is, the first sensing part according to an embodiment  830  may acquire a sensing signal by magnetic force generated from the first magnet scaler  610  and the first single-pole magnet  615  using one sensor. In addition, the second sensing part  840  according to an embodiment may acquire a sensing signal by magnetic force generated from the second magnet scaler  620  and the second single-pole magnet  625  using one sensor. 
     Accordingly, one first hole  126  may be formed in the inner lower surface  121  of the second housing  120 . In addition, one first sensing part  830  disposed on the substrate  800  may be inserted into the first hole  126 . That is, in an embodiment, a sensing signal corresponding to the positions of the first magnet scaler  610  and the first single-pole magnet  615  may be acquired by using the first sensing part  830  including one sensor. Accordingly, the first sensing part  830  may be disposed to overlap at least a portion of the first magnet scaler  610  in the y-axis direction. Also, the first sensing part  830  may be disposed to overlap at least a portion of the first single-pole magnet  615  in the y-axis direction. Specifically, the first sensing part  830  may include a first portion overlapping the first magnet scaler  610  in the y-axis direction, and a second portion overlapping the first monopole magnet  615 . And, the first sensing part  830  in an embodiment may acquire a first sensing signal corresponding to the magnetic force generated by the combination of the first magnet scaler  610  and the first single-pole magnet  615 . 
     In addition, one second hole  127  may be formed in the inner upper surface  122  of the second housing  120 . In addition, one second sensing part  840  disposed on the substrate  800  may be inserted into the second hole  127 . That is, in an embodiment, a sensing signal corresponding to the positions of the second magnet scaler  620  and the second single-pole magnet  625  may be acquired using the second sensing part  840  configured with one sensor. Accordingly, the second sensing part  840  may be disposed to overlap at least a portion of the second magnet scaler  620  in the y-axis direction. Also, the second sensing part  830  may be disposed to overlap with at least a portion of the second single-pole magnet  625  in the y-axis direction. Specifically, the second sensing part  840  may include a first portion overlapping the second magnet scaler  620  in the y-axis direction, and a second portion overlapping the second single-pole magnet  625 . And, the second sensing part  840  in an embodiment may acquire a second sensing signal corresponding to the magnetic force generated by the combination of the second magnet scaler  620  and the second single-pole magnet  625 . 
       FIG.  14    is a front view of first and second driving parts disposed in a second housing according to another exemplary embodiment. Specifically,  FIG.  14    is a view showing a state in which the first and second driving parts are disposed in the second housing, and the substrate is disposed on the outer circumferential surface of the second housing. 
     Before describing  FIG.  14   , the characteristics of the first driving part, the second driving part, the first lens barrel, and the second lens barrel are the same as those described in the previous embodiment, and accordingly, a detailed description thereof will be omitted. 
     Referring to  FIG.  14   , each of the first sensing part  830  and the second sensing part  840  in another embodiment may be configured in plurality. That is, the first sensing part  830  may acquire first and second sensing signals by magnetic force generated from the first magnet scaler  610  and the first single-pole magnet  615  using two sensors, respectively. Also, the second sensing part  840  may acquire third and fourth sensing signals by magnetic force generated from the second magnet scaler  620  and the second single pole magnet  625  using two sensors, respectively. 
     Specifically, the first sensing part  830  may include a first-first sub sensing part  831  and a first-second sub sensing part  832 . The first-first sub-sensing part  831  may acquire a first sensing signal by a magnetic force generated through the first single-pole magnet  615 . To this end, the first-first sub sensing part  831  may be disposed to overlap the first single-pole magnet  615  in the y-axis direction. Also, the first-second sub-sensing part  832  may acquire a second sensing signal by the magnetic force generated through the first magnet scaler  610 . To this end, the first-second sub sensing part  832  may be disposed to overlap the first magnet scaler  610  in the y-axis direction. 
     In addition, the second sensing part  840  may include a second-first sub sensing part  841  and a second-second sub sensing part  842 . The second-first sub-sensing part  841  may acquire a third sensing signal by a magnetic force generated through the second single-pole magnet  625 . To this end, the second-first sub-sensing part  841  may be disposed to overlap the second single-pole magnet  625  in the y-axis direction. Also, the second-second sub-sensing part  842  may acquire a fourth sensing signal by the magnetic force generated through the second magnet scaler  620 . To this end, the second-second sub sensing part  842  may be disposed to overlap the second magnet scaler  620  in the y-axis direction. 
     Accordingly, two first holes  126  may be formed in the inner lower surface  121  of the second housing  120 . In detail, a first-first sub-hole  126   a  and a first-second sub-hole  126   b  may be formed in the inner lower surface  121  of the second housing  120 . The first-first sub-hole  126   a  may overlap the first single-pole magnet  615  and the first-first sub sensing part  831  in the y-axis direction. Accordingly, at least a portion of the first-first sub sensing part  831  may be positioned in the first-first sub-hole  126   a.  The first-second sub-hole  126   b  may overlap the first magnet scaler  610  and the first-second sub sensing part  832  in the y-axis direction. Accordingly, at least a portion of the first-second sub sensing part  832  may be positioned in the first-second sub-hole  126   b.    
     In addition, two second holes  127  may be formed in the inner upper surface  122  of the second housing  120 . In detail, a second-first sub-hole  127   a  and a second-second sub hole  127   b  may be formed on the inner upper surface  122  of the second housing  120 . The second-first sub hole  127   a  may overlap the second single-pole magnet  625  and the second-first sub-sensing part  841  in the y-axis direction. Accordingly, at least a portion of the second-first sub-sensing part  841  may be positioned in the second-first sub-hole  127   a.  The second-second sub-hole  127   b  may overlap the second magnet scaler  620  and the second-second sub sensing part  842  in the y-axis direction. Accordingly, at least a portion of the second-second sub-sensing part  842  may be positioned in the second-second sub hole  127   b.    
     Hereinafter, the characteristics of a first magnet scaler  610 , a second magnet scaler  620 , a first single-pole magnet  615  and a second single-pole magnet  625 , a first sensing part  830 , and a second sensing part  840  will be described with reference to the drawings. Before explaining this, the operations of the first sensing part  830  and the second sensing part  840  are substantially the same, and accordingly, hereinafter, the operation of the first sensing part  830  will be mainly described. 
       FIG.  15    is a view illustrating a sensing signal acquired through a sensing part according to an exemplary embodiment, and  FIG.  16    is a view illustrating the second sensing signal shown in  FIG.  15    in more detail. 
     Referring to  FIG.  15   , the first sensing part  830  may acquire a first sensing signal by a magnetic force generated by the first single-pole magnet  615 . Also, the first sensing part  830  may acquire a second sensing signal by the magnetic force generated by the first magnet scaler  610 . Specifically, the first sensing part  830  may include a first-first sub sensing part  831  and a first-second sub sensing part  832  as described above. 
     In addition, the first-first sub sensing part  831  may acquire a first sensing signal by a magnetic force generated from the first single-pole magnet  615 . Also, the first-second sub sensing part  832  may acquire a second sensing signal by a magnetic force generated from the first magnet scaler  610 . To this end, the embodiment may further include a separate shielding member (not shown) for preventing the magnetic force generated by the first single-pole magnet  615  from being transmitted to the first-second sub sensing part  832  while preventing the magnetic force generated by the first magnet scaler  610  from being transmitted to the first-first sub sensing part  831 . For example, the embodiment may enable accurate sensing signals to be acquired from the first-first sub sensing part  831  and the first-second sub sensing part  832  while suppressing mutual magnetic field interference between the first magnet scaler  610  and the first single-pole magnet  615  using a shielding member. Alternatively, the first-first sub sensing part  831  and the first-second sub-sensing part  832  may acquire a first sensing signal and a second sensing signal in different frequency bands, respectively. 
     In this case, the first sensing signal may be a pulse waveform whose magnitude is changed according to a change in the magnetic force generated by the first single-pole magnet  615 . Here, the voltage range of the pulse waveform may correspond to an operating voltage of the first-first sub sensing part  831 . For example, the pulse waveform may have a specific voltage value corresponding to the magnetic force within a range of −5V to +5V, but is not limited thereto. 
     Here, the first sensing part  830  and the second sensing part  840  in the embodiment may be Hall sensors, but is not limited thereto. For example, the first sensing part  830  and the second sensing part  840  may be implemented as any sensor capable of sensing a change in magnetic force in addition to the Hall sensor. For example, the first sensing part  830  and the second sensing part  840  may be implemented as a Giant Magneto Resistance (GMR) sensor. 
     The first sensing signal is a pulse waveform corresponding to a change in magnetic force generated from the first single-pole magnet  615 . Accordingly, the first sensing signal may appear as a pulse waveform having a constant voltage value only in a specific region in which the first single-pole magnet  615  is disposed in the entire movement stroke of the first lens barrel  200 . For example, the first sensing signal may have a pulse maintaining 0V, and may appear as a pulse waveform in which a voltage value gradually increases as the first lens barrel  200  approaches an initial position. Also, the first sensing signal may have a pulse waveform having a maximum voltage value V 1  when the first lens barrel  200  is moved to the initial position. Also, when the first lens barrel  200  moves from the initial position to another position, the pulse waveform of the first sensing signal may gradually decrease from the maximum voltage value V 1 . 
     Accordingly, when the first lens barrel  200  is positioned at the initial position, the pulse waveform of the first sensing signal may have the maximum voltage value V 1  corresponding to a first preset reference value. 
     When the camera module is initially driven, the driver IC may control the first driving part  300  to move the first lens barrel  200  in the + or − optical axis direction. In addition, the driver IC may monitor the first sensing signal that changes according to the movement of the first lens barrel  200 . In addition, when the first sensing signal has the first reference value, the driver IC may determine the position of the first lens barrel  200  at the point in time when the first sensing signal corresponding to the first reference value is acquired as the initial position. 
     Also, the driver IC may move the first lens barrel  200  from the initial position to a target position. In this case, the target position may be determined by at least one of gyro data acquired through the gyro sensor, zoom magnification, and auto-focusing information. 
     In this case, sensing signal information corresponding to each step position of the first lens barrel  200  in the entire movement stroke of the first lens barrel  200  may be stored in the driver IC. The sensing signal information may be a voltage value or a sensing value of a second sensing signal corresponding to each step position of the first lens barrel  200 . That is, the first lens barrel  200  may move by a predetermined step in the + optical axis or the − optical axis direction based on the initial position. For convenience of explanation,  FIG.  15    shows that the first lens barrel  200  is movable by 8 steps in the + optical axis direction and 8 steps in the − optical axis direction based on the initial position IP. However, the embodiment is not limited thereto. For example, as shown in  FIG.  16   , the first lens barrel  200  may be movable by X steps in the + optical axis direction based on the initial position IP and may be movable by Y steps in the − optical axis direction. Here, the X step and the Y step may be the same as or different from each other. For example, the X step may be 1000 steps, and the Y step may be 500 steps, but is not limited thereto. 
     For example, the first lens barrel  200  may be movable by 8 steps in the + optical axis direction, and may be movable by 8 steps in the − optical axis direction, based on the initial position IP. 
     Accordingly, the first lens barrel  200  may be movable to positions corresponding to a +first step (S 1 ′), a +second step (S 2 ′), a +third step (S 3 ′), a +fourth step (S 4 ′), a +fifth step (S 5 ′), a +sixth step (S 6 ′), a +seventh step (S 7 ′), a +eighth step (S 8 ′) in the +optical axis direction with respect to the initial position IP. In addition, the first lens barrel  200  may be movable to positions corresponding to a −first step (S 1 ), a −second step (S 2 ), a −third step (S 3 ), a −fourth step (S 4 ), a −fifth step (S 5 ), a −sixth step (S 6 ), a −seventh step (S 7 ), a −eighth step (S 8 ) in the − optical axis direction with respect to the initial position IP. 
     In addition, the driver IC stores sensing signal information corresponding to each of the 16 steps. Then, when the target position is determined, the driver IC checks sensing signal information corresponding to the target position. In addition, the first lens barrel  200  may be moved until a point in time when a second sensing signal corresponding to the checked sensing signal is received. 
     At this time, as shown in the drawing, the sensing signal information of the +first step (S 1 ′) and the +fifth step (S 5 ′) may be the same as ‘V 3 ’. In addition, the sensing signal information of the +second step (S 2 ′), the +fourth step (S 4 ′), the +sixth step (S 6 ′) and the +eighth step (S 8 ′) may be the same as ‘0V’. Also, the sensing signal information of the +third step (S 3 ′) and the +seventh step (S 7 ′) may be the same as ‘V 2 ’. 
     However, the first lens barrel  200  moves stepwise from the initial position IP. For example, when the first lens barrel  200  is positioned at the initial position IP and moved in the + optical axis direction, the next position of the first lens barrel  200  corresponds to the + first step (S 1 ). The driver IC may recognize the position at the point in time when the sensing signal of the first ‘V 3 ’ is sensed as the position corresponding to the +first step (S 1 ′), and the position at the point in time when the sensing signal of the second ‘V 3 ’ is sensed may be recognized as a position corresponding to the +fifth step (S 5 ′) of the target position. However, even if the first lens barrel  200  moves stepwise, a slight positional deviation may occur due to various factors. Accordingly, the driver IC may control the first driver to minutely move the first lens barrel  200  until the voltage value corresponding to the second sensing signal becomes the second ‘V 3 ’ value. 
     Meanwhile, as shown in  FIG.  16   , the moving step of the lens barrel in the embodiment may increase. For example, a plurality of sub steps may be additionally included between the initial position IP and the +first step (S 1 ′). For example, six additional sub steps Sa may exist between the initial position IP and the +first step (S 1 ′). In addition, the driver IC may store sensing signal information corresponding to each of the sub steps Sa. For example, first to sixth sub steps may exist in the + optical axis direction from the initial position IP. In addition, the driver IC may store sensing signal information corresponding to the first sub step as ‘V 4 ’. Also, the driver IC may store sensing signal information corresponding to the second sub-step as ‘V 5 ’. Also, the driver IC may store sensing signal information corresponding to the third sub step as ‘V 6 ’. Also, the driver IC may store sensing signal information corresponding to the fourth sub step as ‘V 7 ’. Also, the driver IC may store sensing signal information corresponding to the fifth sub step as ‘V 8 ’. Also, the driver IC may store sensing signal information corresponding to the sixth sub step as ‘V 9 ’. 
     Meanwhile, in one embodiment as described above, each sensing part includes two sub sensing parts, and each sensing signal corresponding to the magnet scaler and the single-pole magnet was acquired from each sub sensing part. Alternatively, in another embodiment, each sensing part is configured with only one sensing part, and accordingly, each sensing part may acquire only one sensing signal corresponding to the magnet scaler and the single-pole magnet. 
       FIG.  17    is a view illustrating a sensing signal acquired through a sensing part according to another exemplary embodiment. 
     As shown in  FIG.  17   , the first sensing part  830  and the second sensing part  840  may acquire a sensing signal by a magnetic force generated by a corresponding magnet scaler and a single-pole magnet, respectively. 
     At this time, each sensing signal corresponding to the magnet scaler and the single-pole magnet in the previous embodiment was respectively acquired from the two sub-sensing parts. 
     Alternatively, the first sensing part  830  and the second sensing part  840  may acquire one sensing signal by the magnetic force generated by the magnet scaler and the single-pole magnet. 
     In this case, one sensing signal sensed by the first sensing part  830  has a pulse waveform in which the first sensing signal and the second sensing signal described with reference to  FIG.  15    are mixed. 
     In addition, one sensing signal sensed by the second sensing part  840  also has a pulse waveform in which the third sensing signal and the fourth sensing signal are mixed. 
     In this case, the sensing signal may be the same as the second sensing signal or the fourth sensing signal described above in the remaining region except for a first region R 1  in the entire movement stroke. 
     For example, the sensing signal acquired by the first sensing part  830  may be the same as the above-described second sensing signal in the remaining region except for the first region R 1  in the entire movement stroke of the first lens barrel  200 . In addition, the sensing signal acquired by the second sensing part  840  may be the same as the above-described fourth sensing signal in the remaining region except for the first region R 1  within the entire movement stroke of the second lens barrel  400 . At this time, the sensing signals respectively acquired by the first sensing part  830  and the second sensing part  840  have substantially the same characteristics, and accordingly, hereinafter, the sensing signal acquired by the first sensing part  830  will be mainly described. 
     The first region R 1  of the sensing signal may have a voltage value in which both the magnetic force generated by the first magnet scaler  610  and the first single-pole magnet  615  are reflected. In this case, the pulse waveform in the first region R 1  may be different from the pattern of the pulse waveform in other regions except for this. That is, the pulse waveform in the region other than the first region R 1  has a regular sinusoidal waveform. However, the first region R 1  may have a shape such as a broken waveform instead of a regular sine wave. Accordingly, the embodiment may check whether the first lens barrel  200  exists in a position corresponding to the first region R 1  by analyzing the pulse waveform of the sensing signal. Also, sensing signal information corresponding to the pulse waveform in the first region R 1  may be separately stored. As an example, the driver IC may store sensing signal information corresponding to the initial position IP of the first lens barrel  200  in the first region R 1  and positions other than this for each step. Accordingly, it is possible to accurately measure the initial position of the first lens barrel  200  using only the one sensing part, and also to accurately move the first lens barrel  200  to a target position. 
     Meanwhile, the sensing signal in another embodiment may be a mixed waveform in which two pulse waveforms (eg, a pulse waveform of a first sensing signal and a pulse waveform of a second sensing signal) are mixed. Accordingly, the driver IC may use a band-pass filter (not shown) to separate the mixed waveform into two separate waveforms (eg, a pulse waveform of the first sensing signal and a pulse waveform of the second sensing signal). In addition, the driver IC may accurately move the first lens barrel  200  to an initial position and a target position by using each of the separated individual waveforms. 
       FIG.  18    is a flowchart for explaining an initial operation method of a camera module according to an embodiment, and  FIG.  19    is a flowchart for explaining a method of operating a function of a camera module according to an embodiment. 
     Hereinafter, a method of operating a camera module according to an embodiment will be described. 
     Referring to  FIG.  18   , the driver IC moves the lens barrel S 100 . In detail, the driver IC controls the first driving part  300  to move the first lens barrel  200  in the + optical axis direction or the − optical axis direction. In addition, the driver IC controls the second driver  500  to move the second lens barrel  400  in the + optical axis direction or the − optical axis direction. 
     Then, the driver IC confirms the sensing signal acquired from the first sensing part  830  and the second sensing part  840  according to the movement of the first lens barrel  200  or the second lens barrel  400  S 110 . In detail, the driver IC checks the first sensing signal acquired through the first sensing part  830  and acquires a first sensing value (eg, a voltage value of the first sensing signal) according to the check. In addition, the driver IC checks the third sensing signal acquired through the second sensing part  840  to acquire a corresponding sensing value (eg, a voltage value of the third sensing signal). 
     Next, the driver IC determines whether the acquired sensing value corresponds to a preset reference value S 120 . The reference value may include a voltage value (eg, a first reference value) of the first sensing signal in a state in which the first lens barrel  200  is positioned at the initial position IP. Also, the reference value may include a voltage value (eg, a second reference value) of the second sensing signal in a state in which the second lens barrel  400  is positioned at the initial position IP. 
     In addition, when the voltage value of the first sensing signal is the same as the first reference value, the driver IC may determine that the first lens barrel  200  is positioned at the initial position IP and end the initial operation. In addition, when the voltage value of the third sensing signal is the same as the preset second reference value, the driver IC may determine that the second lens barrel  400  is located at the initial position IP and end the initial operation. 
     In addition, when the voltage value of the first sensing signal acquired through the first sensing part  830  is different from the first reference value, the driver IC returns to step S 100  to move the first lens barrel  200  to the next step. In addition, when the voltage value of the third sensing signal acquired through the second sensing part  840  is different from the second reference value, the driver IC returns to step S 100  to move the second lens barrel  400  to the next step. 
     Referring to  FIG.  19   , the driver IC may move the first lens barrel  200  and/or the second lens barrel  400  to a target position in a state in which the first lens barrel  200  and the second lens barrel  400  are positioned at the initial position IP. 
     To this end, the driver IC may determine a target position of the first lens barrel  200  and determine first sensing signal information corresponding to the determined target position. Also, the driver IC may determine a target position of the second lens barrel  400  and determine second sensing signal information corresponding to the determined target position S 200 . The first sensing signal information may mean a voltage value of a second sensing signal acquired through the first sensing part  830  in a state in which the first lens barrel  200  is positioned at a target position. Also, the second sensing signal information may refer to a voltage value of a fourth sensing signal acquired through the second sensing part  840  in a state in which the second lens barrel  400  is positioned at a target position. 
     Thereafter, the driver IC controls the first driving part  300  to move the first lens barrel  200  stepwise in the + optical axis direction or the − optical axis direction. In addition, the driver IC controls the second driver  500  to move the second lens barrel  400  stepwise in the + optical axis direction or the − optical axis direction S 210 . 
     In addition, the driver IC acquires a second sensing value for the second sensing signal acquired through the first sensing part  830  according to the movement of the first lens barrel  200 . That is, as the first lens barrel  200  moves, the driver IC acquires a voltage value of the second sensing signal acquired at the moved position. In addition, the driver IC acquires a sensing value for the fourth sensing signal acquired through the second sensing part  840  according to the movement of the second lens barrel  400 . That is, as the second lens barrel  400  moves, the driver IC acquires a voltage value of the fourth sensing signal acquired at the moved position. 
     Thereafter, the driver IC determines whether the voltage value of the second sensing signal corresponds to the target position of the first lens barrel  200 . Also, the driver IC determines whether the voltage value of the fourth sensing signal corresponds to the target position of the second lens barrel  400  S 220 . 
     Then, when the voltage value of the second sensing signal corresponds to the target position of the first lens barrel  200 , the driver IC ends the moving operation of the first lens barrel  200 . Also, when the voltage value of the fourth sensing signal corresponds to the target position of the second lens barrel  400 , the driver IC ends the movement of the second lens barrel  400 . 
     In addition, if the voltage value of the second sensing signal does not correspond to the target position of the first lens barrel  200 , the driver IC returns to the step S 210  to move the first lens barrel  200  to a position corresponding to the next step. Also, if the voltage value of the fourth sensing signal does not correspond to the target position of the second lens barrel  400 , the driver IC returns to the step S 210  to move the second lens barrel  400  to a position corresponding to the next step. 
       FIG.  20    is a perspective view of a camera module according to an embodiment, and  FIG.  21    is a perspective view in which some components are omitted from the camera module according to the embodiment. 
     Referring to  FIGS.  20  and  21   , 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 a first camera actuator  1000  and a second camera actuator  2000 , and a cover case  15  for protecting the first camera actuator  1000  and the second camera actuator  2000  may be included. 
     The first camera actuator  1000  may support a plurality of lenses and may perform a zoom function or an autofocus function by moving the lenses in the optical axis direction in response to a control signal from the controller. That is, the first camera actuator  1000  may be the camera actuator of  FIGS.  1  to  19    described above. 
     The second camera actuator  2000  may be an optical image stabilizer (OIS) actuator. In this case, the light incident on the camera module  10  from the outside may be preferentially incident on the second camera actuator  2000 . In addition, the light incident on the second camera actuator  2000  may be incident on the first camera actuator  1000  by changing the path of the light, and the light passing through the first camera actuator  1000  may be incident on the image sensor  900 . 
       FIG.  22    is an exploded perspective view of a second camera actuator according to an embodiment. Also,  FIG.  23    is a view of a third driving part of the second camera actuator according to the embodiment, and  FIG.  24    is a view of a third housing of the second camera actuator according to the embodiment.  FIGS.  25  and  26    are views of the prism unit of the second camera actuator according to the embodiment. 
     The second camera actuator according to the embodiment will be described in more detail with reference to  FIGS.  22  to  26   . 
     Referring to  FIG.  22   , the second camera actuator  2000  may include a cover member  2100 , a third housing  2200 , a third driving part  2300 , and a prism unit  2400 . 
     The cover member  2100  may include an accommodating space therein, and at least one side surface may be open. For example, the cover member  2100  may have a structure in which a plurality of side surfaces connected to each other are opened. In detail, the cover member  2100  may have a structure in which a front surface through which light is incident from the outside, a lower surface corresponding to the first camera actuator  1000 , and a rear surface opposite the front surface, and a light movement path of the prism unit  2400 , which will be described later, may be provided. 
     The cover member  2100  may include a rigid material. For example, the cover member  2100  may include a material such as resin, metal, or ceramic, and may support the third housing  2200  disposed in the accommodation space. For example, the cover member  2100  is disposed to surround the third housing  2200 , the third driving part  2300 , the prism unit  2400 , and the like, and may support the components. 
     Referring to  FIG.  23   , the third driving part  2300  may include a driving part circuit board  2310 , a coil unit  2330 , and a magnet  2350 . 
     The driving part circuit board  2310  may be connected to a power source (not shown) to apply power to the coil unit  2330 . The driving part circuit board  2310  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 coil unit  2330  may be electrically connected to the driving part circuit board  2310 . The coil unit  2330  may include one or a plurality of coil units. For example, the coil unit  2330  may include a first coil unit  2331 , a second coil unit  2332 , and a third coil unit  2333 . 
     The first to third coil units  2331 ,  2332 , and  2333  may be spaced apart from each other. For example, the driving part circuit board  2310  may have a ‘C’ shape, and the first coil unit  2331  and the second coil unit  2332  may be respectively disposed on first and second surfaces of the driving part circuit board  2310  facing each other. Also, the third coil unit  2333  may be disposed on a third surface connecting the first and second surfaces of the driving part circuit board  2310 . 
     The magnet  2350  may include one or a plurality of magnets. For example, the magnet  2350  may include a first magnet  2351 , a second magnet  2352 , and a third magnet  2353  disposed in a region corresponding to the coil unit  2330 . In detail, the first magnet  2351  may be disposed on a region corresponding to the first coil unit  2331  on the first surface of the driving part circuit board  2310 . Also, the second magnet  2352  may be disposed on a region corresponding to the second coil unit  2332  on the second surface of the driving part circuit board  2310 . Also, the third magnet  2353  may be disposed on a region corresponding to the third coil unit  2333  on the third surface of the driving part circuit board  2310 . 
     The third driving part  2300  may further include a Hall sensor. For example, the Hall sensor includes a first Hall sensor (not shown) disposed adjacent to one coil unit selected from among the first coil unit  2331  and the second coil unit  2332 , and a second Hall sensor (not shown) disposed adjacent to the third coil unit  2333 . 
     The third driving part  2300  may tilt the prism unit  2400 . The third driving part  2300  may control the tilting of the prism unit  2400  along a first axis or a second axis. 
     Referring to  FIG.  24   , the third housing  2200  may include an accommodation space for accommodating the prism unit  2400 . The third housing  2200  may include a plurality of inner surfaces. For example, the third housing  2200  may be included a first surface  2200 S 1  corresponding to a first region of the driving part circuit board  2310  and a second surface  2200 S 2  corresponding to a second region of the driving part circuit board  2310 , and a third surface  2200 S 3  corresponding to the third region of the driving part circuit board  2310 . 
     In detail, the third housing  2200  includes a first surface  2200 S 1  corresponding to the first coil unit  2331 , a second surface  2200 S 2  corresponding to the second coil unit  2332 , and the third surface  2200 S 3  corresponding to the third coil unit  2333 . In addition, the third housing  2200  may include a fourth surface  2200 S 4  connected to the first surface  2200 S 1  and the second surface  2200 S 2  and connected to the third surface  2200 S 3 . 
     The third housing  2200  may include a plurality of housing holes  2210 . The housing hole  2210  may be a through hole penetrating the outer and inner surfaces of the third housing  2200 . The plurality of housing holes  2210  may include first to third housing holes  2211 ,  2212 , and  2213 . The first housing hole  2211  may be a through hole passing through the first surface  2200 S 1  and an outer surface corresponding to the first surface  2200 S 1 . The second housing hole  2212  may be a through hole passing through the second surface  2200 S 2  and an outer surface corresponding to the second surface  2200 S 2 . The third housing hole  2213  may be a through hole passing through the third surface  2200 S 3  and an outer surface corresponding to the third surface  2200 S 3 . 
     The first housing hole  2211  may be disposed in a region corresponding to the first coil unit  2331 . Also, the first housing hole  2211  may have a size and shape corresponding to that of the first coil unit  2331 . Accordingly, the first coil unit  2331  may be partially or entirely inserted into the first housing hole  2211 . 
     The second housing hole  2212  may be disposed in a region corresponding to the second coil unit  2332 . Also, the second housing hole  2212  may have a size and shape corresponding to that of the second coil unit  2332 . Accordingly, the second coil unit  2332  may be partially or entirely inserted into the second housing hole  2212 . 
     The third housing hole  2213  may be disposed in a region corresponding to the third coil unit  2333 . Also, the third housing hole  2213  may have a size and shape corresponding to that of the third coil unit  2333 . Accordingly, the third coil unit  2333  may be partially or entirely inserted into the third housing hole  2213 . 
     Referring to  FIGS.  25  and  26   , the prism unit  2400  may be disposed in the third housing  2200 . In detail, the prism unit  2400  may be disposed in the accommodation space of the third housing  2200 . 
     The prism unit  2400  may include a prism  2410  and a prism mover  2430  disposed on the prism  2410 . 
     The prism  2410  may be a right-angle prism. The prism  2410  may reflect the direction of light incident from the outside. That is, the prism  2410  may change the path of the light incident to the second camera actuator  2000  from the outside toward the first camera actuator  1000 . 
     The prism mover  2430  may be disposed on the prism  2410 . The prism mover  2430  may be disposed to surround the prism  2410 . At least one side of the prism mover  2430  may be open and may include an accommodating space therein. In detail, the prism mover  2430  may have a structure in which a plurality of outer surfaces connected to each other are opened. For example, the prism mover  2430  may have a structure in which an outer surface corresponding to the prism  2410  is open, and may include an accommodation space defined as a first space  2435  therein. 
     The prism mover  2430  may include an inner surface  2435 S. The inner surface  2435 S may be an inner surface constituting the first space  2435 . The first space  2435  may have a shape corresponding to the prism  2410 . The inner surface  2435 S of the first space  2435  may directly contact the prism  2410 . 
     The prism mover  2430  may include a step  2436 . The step  2436  may be disposed in the first space  2435 . The step  2436  may serve as a guide and/or a seating part for the prism  2410 . In detail, a protrusion corresponding to the step  2436  may be formed on the outside of the prism  2410 . The prism  2410  may be disposed in the first space  2435  such that the protrusion is guided by the step  2436  of the prism mover  2430 . Accordingly, the prism mover  2430  may effectively support the prism  2410 . In addition, the prism  2410  may be seated at a set position, and may have improved alignment characteristics within the prism mover  2430 . 
     The prism unit  2400  may include a plurality of outer surfaces. For example, the prism mover  2430  may include a plurality of outer surfaces. The prism mover  2430  may include a first outer surface  2430 S 1  corresponding to the first surface  2200 S 1  of the third housing  2200 , a second outer surface  2430 S 2  corresponding to the second surface  2200 S 2 , a third outer surface  2430 S 3  corresponding to the third surface  2200 S 3  and a fourth outer surface  2430 S 4  corresponding to the fourth surface  2200 S 4 . 
     Also, the prism mover  2430  may include a plurality of recesses. The recess may be a groove having a concave shape on the outer surface of the prism mover  2430  in the direction of the first space  2435 . The plurality of recesses may include a third recess  2433 R 1 , a fourth recess  2433 R 2 , and a fifth recess  2433 R 3 . For example, the third recess  2433 R 1  may be disposed on the first outer surface  2430 S 1 . The third recess  2433 R 1  may be disposed in a region corresponding to the first housing hole  2211 . Also, the fourth recess  2433 R 2  may be disposed on the second outer surface  2430 S 2 . The fourth recess  2433 R 2  may be disposed in a region corresponding to the second housing hole  2212 . Also, the fifth recess  2433 R 3  may be disposed on the third outer surface  2430 S 3 . The fifth recess  2433 R 3  may be disposed in a region corresponding to the third housing hole  2213 . That is, the first housing hole  2211  may correspond to the first coil unit  2331 , and the second housing hole  2212  may correspond to the second coil unit  2332 . Also, the third housing hole  2213  may correspond to the third coil unit  2333 . 
     The magnet  2350  may be disposed in the recess. For example, the first magnet  2351  is in the third recess  2433 R 1 , the second magnet  2352  is in the fourth recess  2433 R 2 , and the third magnet  2353  is in the third recess  2433 R 1  so that they can be spaced apart from each other. 
     The prism unit  2400  may control tilting in a first axis (x-axis) or a second axis (y-axis) by a driving part of the third driving part  2300 . Here, the first axis tilting may mean tilting in the vertical direction (y-axis direction; second direction) with the x-axis direction shown in the drawing as the rotation axis, and the second axis tilting may mean tilting in the left and right direction (x-axis direction; first direction) with the y-axis direction shown in the drawing as the rotation axis. 
     The prism unit  2400  may be tilt-controlled based on attractive and repulsive forces generated from the third coil unit  2333  and the third magnet  2353  when power is applied. 
     In detail, the third driving part  2300  includes a virtual first formed by the first coil unit  2331 , the second coil unit  2332 , the first magnet  2351 , and the second magnet  2352 . The prism unit  2400  may be provided rotatably about a line (not shown) as an axis. Here, the first line may be a line extending in the first direction (x-axis direction). 
     The third coil unit  2333  and the third magnet  2353  may rotate the prism unit  2400  in an up-down direction (y-axis direction) with the first line as a rotation axis. 
     For example, a repulsive force is generated between the third coil unit  2333  and the third-first magnet of the third magnet  2353 , and an attractive force may be generated between the third coil unit  2333  and the third magnet third-second of the third magnet  2353 . Here, the third-first magnet and the third-second magnet may face each other in a third direction (z-axis direction). In this case, the prism unit  2400  may be tilted in the upper direction (based on the y-axis direction) by the generated electromagnetic force. 
     In addition, an attractive force is generated between the third coil unit  2333  and the third-first magnet of the third magnet  2353 , and a repulsive force may be generated between the third coil unit  2333  and the third-second magnet of the third magnet  2353 . In this case, the prism unit  2400  may be tilted in the lower direction (based on the y-axis direction) by the generated electromagnetic force. 
     The prism unit  2400  may be tilt-controlled based on attractive and repulsive forces generated from the first coil unit  2331 , the second coil unit  2332 , the first magnet  2351 , and the second magnet  2352  when power is applied. 
     In detail, the third driving part  2300  may be provided such that the prism unit  2400  can be rotated about a second virtual line (not shown) formed by the third magnet  2353  and the third coil unit  2333  as an axis. Here, the second line may be a line extending in the second direction (y-axis direction). 
     The first coil unit  2331 , the second coil unit  2332 , the first magnet  2351  and the second magnet  2352  may rotate and move the prism unit  2400  in a left-right direction (x-axis direction) with the second line as a rotation axis. 
     For example, a repulsive force is generated between the first coil unit  2331  and the first-first magnet of the first magnet  351 , and an attractive force may be generated between the first coil unit  2331  and the first-second magnet of the first magnet  2351 . In addition, an attractive force is generated between the second coil unit  2332  and the second-first magnet of the second magnet  2352 , and a repulsive force may be generated between the second coil unit  2332  and the second-second magnet of the second magnet  2352 . Here, the first-first magnet and the second-first magnet may face each other in a first direction, and the first-second magnet and the second-second magnet may face each other in a first direction. In this case, the prism unit  2400  may be tilted in the left direction (based on the x-axis direction) by the generated electromagnetic force. 
     In addition, an attractive force is generated between the first coil unit  2331  and the first-first magnet of the first magnet  2351 , and a repulsive force may be generated between the first coil unit  2331  and the first-second magnet of the first magnet  2351 . In addition, a repulsive force is generated between the second coil unit  2332  and the second-first magnet of the second magnet  2352 , and an attractive force may be generated between the second coil unit  2332  and the second-second magnet of the second magnet  2352 . In this case, the prism unit  2400  may be tilted in the right direction (based on the x-axis direction) by the generated electromagnetic force. 
     That is, the second camera actuator  2000  according to the embodiment may control the movement path of the light incident by the third driving part  2300  including the VCM (Voice Coil Motor) method. However, the embodiment is not limited thereto, and the third driving part  2300  may include a piezoelectric device, for example, a piezo-electric device or a shape memory alloy, and the movement path of the incident light may be controlled by using the piezo element and/or the shape memory alloy. 
       FIG.  27    is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied. 
     Referring to  FIG.  27   , 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 auto-focus function using an image. 
     The camera module  10  processes an image frame of a still image or a moving image acquired 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.  28    is a perspective view of the vehicle  5  to which the camera module according to the embodiment is applied. For example,  FIG.  28    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.  28   , 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  10  according to the embodiment 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 acquire 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 acquired by an image sensor (eg, CMOS or CCD). The image processing module may process a still image or a moving image acquired 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. 
     The camera actuator and the camera module according to the embodiment may have improved optical properties. In detail, the camera actuator and the camera module according to the embodiment include a driving part for driving the lens group including a piezoelectric device, the lens group can be more precisely controlled by the driving part, and friction generated when the lens group is moved can be minimized. Accordingly, the embodiment may provide more improved autofocus and zoom functions. 
     In addition, the camera actuator and the camera module according to the embodiment may have improved operational reliability. In detail, the embodiment includes a first magnet part and a second magnet part mounted on the lens barrel. In this case, the first magnet part may include a reference magnet, and the second magnet part may include a magnet scaler. Also, the embodiment may include a sensing part disposed adjacent to the first magnet part and the second magnet. The sensing part may measure a change in a magnetic field by the first magnet part and the second magnet part. That is, the sensing part may precisely move the lens group to the initial position by using the change in the magnetic field by the first magnet part. Also, the sensing part may precisely move the lens group to the target position by using the change in the magnetic field by the second magnet part. Accordingly, the embodiment may improve the accuracy of the autofocus and zoom functions of the camera module, and thus the operation reliability may be improved. 
     In addition, the camera actuator and the camera module according to the embodiment can eliminate assembly deviation. In detail, although the embodiment includes the first magnet part and the second magnet part, this may be an integrally formed magnet part. That is, the integrally formed magnet part may be a magnet configured by magnetizing a magnet scaler corresponding to the second magnet part and a reference magnet corresponding to the first magnet part at once. Therefore, according to the embodiment, it is possible to solve the position erroneous detection that occurs due to the assembly deviation between the magnet scaler and the reference magnet, and thus the operation reliability can be further improved. 
     In addition, the camera actuator and the camera module according to the embodiment enable the position of the lens group to be sensed using a magnet scaler and a reference magnet rather than a conventional PI sensor, so that the position of the lens group can be sensed without image deterioration and thus image quality can be improved. 
     In addition, the camera actuator and the camera module according to the embodiment may have improved process efficiency. In detail, the camera actuator and the camera module according to the embodiment include a housing accommodating a plurality of lens groups, for example, a plurality of lens barrels, and a guide jaw may be disposed on an inner lower surface of the housing facing the lens barrel. In this case, the guide jaw may have a position and a distance corresponding to a set lens barrel among the plurality of lens barrels, thereby preventing an unset lens barrel from being disposed. Accordingly, it is possible to effectively arrange the set lens barrels at the set positions, and it is possible to prevent other lens barrels from being misplaced. Accordingly, the embodiment may reduce defects caused by misalignment of the plurality of lens barrels, and may have improved process efficiency. 
     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.