Patent Publication Number: US-2022239808-A1

Title: Camera module and camera device comprising same

Description:
TECHNICAL FIELD 
     An embodiment relates to a camera module and a camera device comprising the same. 
     BACKGROUND ART 
     The camera module captures a subject and stores it as an image or video, and is installed in mobile terminals such as cell phones, laptops, drones, and vehicles. 
     On the other hand, portable devices such as smartphones, tablet PCs, and laptops have built-in micro camera modules, and such a camera module may perform an autofocus (AF) function that automatically adjusts a distance between an image sensor and a lens to align the focal lengths of the lenses. 
     In addition, recent camera modules may perform a zooming function of zooming up or zooming out by increasing or decreasing a magnification of a distant subject through a zoom lens. 
     In addition, recent camera modules employ Image Stabilization (IS) technology to correct or prevent image shake due to camera movement caused by unstable fixing devices or user movement. 
     The image stabilization (IS) technology includes an optical image stabilizer (OIS) technology and an image stabilization prevention technology using an image sensor. 
     OIS technology is a technology that corrects motion by changing the path of light, and image stabilization technology using an image sensor is a technology that compensates movement by mechanical and electronic methods, but OIS technology is being adopted more and more. 
     On the other hand, OIS technology is a method of correcting the image quality by moving the lens or image sensor of the camera to correct the optical path, in particular, OIS technology detects camera movement through a gyro sensor and calculates a distance that a lens or image sensor should move based on this. 
     For example, the OIS correction method includes a lens movement method and a module tilting method. In the lens movement method, only the lens in the camera module is moved to realign a center of the image sensor and the optical axis. On the other hand, the module tilting method is a method of moving an entire module including the lens and image sensor. 
     In particular, the module tilting method has a wider correction range than the lens movement method, and since the focal length between the lens and the image sensor is fixed, it has the advantage of minimizing image distortion. 
     On the other hand, in the case of the lens movement method, a Hall sensor is used to detect the position and movement of the lens. However, the Hall sensor as described above has linearity when the lens movement distance is small, but has a problem in that the linearity decreases as the lens movement distance increases. In addition, the Hall sensor is greatly affected by a surrounding environment, and in particular, has a problem of poor reliability due to heat generated when the camera module is driven. 
     DISCLOSURE 
     Technical Problem 
     An embodiment provides a camera module including a position detection sensor having excellent linearity and hysteresis even when a lens movement distance increases, and a camera device including the same. 
     In addition, an embodiment provides a camera module and a camera device including the same, which can solve reliability problems that may occur in various usage environments of the camera module and facilitate assembly by making a base and a rail separable from each other. 
     In addition, an embodiment provides a camera module and a camera device including the same, which can facilitate the design of the lens barrel and the design of the mover by making the lens barrel and the mover separable from each other. It also provides a camera module and device that facilitates assembly of the lens barrel, mover, base and rail. 
     In addition, an embodiment provides a camera module capable of preventing friction torque from being generated when a lens is moved through zooming in the camera module, and a camera device including the same. 
     In addition, an embodiment provides a camera module and a camera device including the same, which can prevent the occurrence of a phenomenon in which a lens decent or a lens tilt or the center of the lens and the center axis of the image sensor do not coincide when the lens is moved through zooming in the camera module. 
     In addition, an embodiment provides an ultra-slim and ultra-small camera module and a camera device including the same. 
     In addition, an embodiment provides a camera actuator capable of securing a sufficient amount of light by resolving a size limitation of a lens in a lens assembly of an optical system when OIS is implemented, and a camera module including the same. 
     In addition, an embodiment provides a camera module capable of exhibiting the best optical characteristics by minimizing the occurrence of a decent or tilt phenomenon when implementing OIS, and a camera device including the same. 
     In addition, an embodiment provides a camera module capable of preventing magnetic field interference with a magnet for AF or Zoom and a camera device including the same when implementing OIS. 
     In addition, one of the technical tasks of the embodiment is to provide a camera module capable of implementing OIS with low power consumption and a camera device including the same. 
     The technical problems of the embodiments are not limited to those described in this item, and include those that can be grasped from the entire description of the invention. 
     Technical Solution 
     A camera module according to an embodiment includes base; a guide portion disposed on an inner side of the base; a lens assembly moving along the guide portion; and a substrate disposed on an outer side of the base, wherein the lens assembly includes a conductor disposed under a lower surface thereof, and wherein the substrate includes a resonance coil disposed in a region facing the lower surface of the lens assembly and overlapping at least a part of the conductor in a direction perpendicular to an optical axis direction in response to movement of the lens assembly. 
     In addition, the guide portion includes a first guide portion disposed on a first inner side of the base; and a second guide portion disposed on a second inner side facing the first inner side of the base, wherein the lens assembly includes a first lens assembly moving along the first guide portion; and a second lens assembly moving along the second guide portion. 
     In addition, the conductor includes a first conductor disposed under a lower surface of the first lens assembly; and a second conductor disposed under a lower surface of the second lens assembly; wherein the resonance coil includes a first resonance coil overlapping at least a part of the first conductor within a movement range of the first conductor corresponding to a stroke of the first lens assembly; and a second resonance coil overlapping at least a part of the second conductor within a movement range of the second conductor corresponding to a stroke of the second lens assembly. 
     In addition, the first resonance coil is disposed on the substrate to be spaced apart from the second resonance coil. 
     In addition, the movement range of the first conductor does not overlap the movement range of the second conductor in a direction perpendicular to the optical axis direction. 
     In addition, the first resonance coil is spaced apart from the first conductor by a first distance, wherein the second resonance coil is spaced apart from the second conductor by a second distance, wherein at least one of the first and second distances is in the range of 1.0 mm to 2.0 mm. 
     In addition, at least one of the first and second resonance coils has a thickness of 50 μm or more. 
     In addition, at least one of the first and second resonance coils has a width in the range of 50 um to 1 mm. 
     In addition, at least one of the first and second resonance coils is disposed by turning a plurality of times with a spacing in the range of 50 um to 300 um on the substrate. 
     In addition, at least one of the first and second resonance coils has an outer width that is at least three times greater than an inner width. 
     In addition, the substrate includes a plurality of insulating layers, and each of the first and second resonance coils is disposed on the plurality of insulating layers to have a plurality of layer structures. 
     In addition, the plurality of insulating layers includes first to fourth insulating layers, wherein each of the first and second resonance coils includes a first portion disposed on the first insulating layer and disposed by turning in a first direction; a second portion disposed on the second insulating layer, connected to the first portion, and disposed by turning in a second direction opposite to the first direction; a third portion disposed on the third insulating layer, connected to the second portion, and disposed by turning in the first direction; and a fourth portion disposed on the fourth insulating layer, connected to the third portion, and disposed by turning in the second direction. 
     In addition, each of the first and second resonance coils includes an oscillation coil and a first and second receiving coil, and the oscillation coil is disposed to surround an outer side of the first and second receiving coils. 
     In addition, the plurality of insulating layers includes first to sixth insulating layers, wherein each of the first and second resonance coils includes a first portion of the oscillation coil disposed on the first insulating layer and disposed by turning in a first direction; a second portion of the oscillation coil disposed on the second insulating layer, connected to the first portion of the oscillation coil, and disposed by turning in a second direction opposite to the first direction; a first portion of the first receiving coil disposed on the second insulating layer; a second portion of the first receiving coil disposed on the third insulating layer and connected to the first portion of the first receiving coil; a first portion of the second receiving coil disposed on the fourth insulating layer; a third portion of the oscillation coil disposed on the fifth insulating layer, connected to the second portion of the oscillation coil, and disposed by turning in the first direction; a second portion of the second receiving coil disposed on the fifth insulating layer and connected to the first portion of the second receiving coil; and a fourth portion of the oscillation coil disposed on the sixth insulating layer, connected to the third portion of the oscillation coil, and disposed by turning in the second direction. 
     In addition, the first receiving coil and the second receiving coil have a shape in which a sine wave and a cosine wave are combined. 
     In addition, the sine wave and the cosine wave include a rising part and a falling part, and a rising part of the first receiving coil is disposed on a different layer from a falling part of the first receiving coil, and a rising part of the second receiving coil is disposed on a different layer from a falling part of the first receiving coil. 
     On the other hand, a camera module according to an embodiment includes a base; a guide portion disposed on an inner side of the base; a lens assembly moving along the guide portion; and a substrate disposed on an outer side the base, wherein the lens assembly includes a mover on which the driving portion is disposed; and a lens barrel detachably coupled to the mover and on which a lens is disposed. 
     In addition, the guide portion, a first guide portion disposed on a first inner side of the base; and a second guide portion disposed on a second inner side facing the first inner side of the base, wherein the lens assembly includes a first lens assembly moving along the first guide portion; and a second lens assembly moving along the second guide portion. 
     In addition, the first lens assembly includes a first lens barrel on which a first lens is disposed and a first mover on which a first driving portion is disposed, and the second lens assembly includes a second lens barrel on which a second lens is disposed. and a second mover on which a second driving portion is disposed. 
     In addition, the first mover includes a first coupling portion to which the first driving portion is coupled and a second coupling portion to which the first lens barrel is coupled, and the second mover includes a third coupling portion to which the second driving portion is coupled, and a fourth coupling portion to which the second lens barrel is coupled, wherein the first lens barrel is detachably coupled to the second coupling portion, and the second lens barrel is detachably coupled to the fourth coupling portion. 
     In addition, the substrate includes a first region disposed on an outer side of a lower surface of the base; a second region disposed on a first outer side corresponding to the first inner side of the base; and a third region disposed on a second outer side corresponding to the second inner side of the base. 
     In addition, the first lens barrel includes a first yoke receiving portion coupled to the second coupling portion and receiving the first yoke therein, and the second lens barrel includes a second yoke receiving portion coupled to the fourth coupling portion and receiving the second yoke therein. 
     In addition, the camera module further includes a first ball disposed between the first guide portion and the first mover; and a second ball disposed between the second guide portion and the second mover. 
     In addition, the first ball includes at least one first-first ball disposed on an upper side of the first mover and at least one first-second ball disposed on a lower side of the first mover, and wherein the second ball includes at least one second-first ball disposed on an upper side of the second mover and at least one second-second ball disposed on a lower side of the second mover. 
     In addition, the first mover includes a first-first arrangement portion having a first shape so that the first-first ball is disposed on an upper surface thereof, and a first-second arrangement portion having a second shape so that the second-first ball is disposed on a lower surface thereof, wherein the second mover includes a second-first arrangement portion having the first shape so that the second-first ball is disposed on an upper surface thereof, and a second-second arrangement portion having the second shape so that the second-second ball is disposed on a lower surface thereof, and wherein the first shape is different from the second shape. 
     In addition, the first shape has a groove shape into which the first-first ball or the second-first ball is inserted, and the second shape has a rail shape in which the first-second ball or the second-second ball is disposed and extends in an optical axis direction. 
     In addition, at least one of the first to third regions of the substrate is a rigid region, and the substrate includes a first flexible region between the first and second regions and a second flexible region between the second and third regions, wherein the first and second flexible regions are bent along an outer side of the base, and the each of the first to third regions is disposed on different outer surfaces of the base. 
     In addition, the first lens assembly includes a first conductor disposed on a lower surface of the first lens barrel, and the second lens assembly includes a second conductor disposed on a lower surface of the second lens barrel. 
     In addition, the substrate includes a first resonance coil disposed on a first part of the first region and a second resonance coil disposed on a second part of the first region, and wherein the first resonance coil is spaced apart from the second resonance coil by a predetermined interval. 
     In addition, the camera module according to an embodiment includes a base; a first guide portion disposed on a first inner side of the base; a second guide portion disposed on a second inner side of the base; a first lens assembly moving along the first guide portion; a second lens assembly moving along the second guide portion; and a substrate disposed on an outer side of the base, wherein the substrate includes: a first region disposed on a lower surface of the base; a second region disposed on a first outer side corresponding to the first inner side of the base, and a third region disposed on a second outer side corresponding to the second inner side of the base. 
     In addition, the first lens assembly includes a first lens barrel on which a first lens is disposed and a first mover on which a first driving portion is disposed, and the second lens assembly includes a second lens barrel on which a second lens is disposed, and a second mover on which a second driving portion is disposed, wherein the substrate includes a third driving portion disposed on the second region to face the first driving portion, and a fourth driving portion disposed on the third region to face the second driving portion. 
     In addition, at least one of the first to third regions of the substrate is a rigid region, and the substrate includes a first flexible region between the first and second regions; and a second flexible region between the second and third regions, and wherein the first and second flexible regions are bent along the outer side of the base. 
     In addition, the first lens assembly includes a first conductor disposed under a lower surface of the first lens barrel, and the second lens assembly includes a second conductor disposed on a lower surface of the second lens barrel. 
     In addition, a width of at least one of the first conductor and the second conductor changes in the optical axis direction. 
     In addition, at least one of the first and second conductors has any one of a triangular shape and a rhombus shape. 
     In addition, the width of the first and second conductors is linearly changed in the optical axis direction. 
     In addition, the substrate includes a first resonance coil disposed on a first part of the first region and a second resonance coil disposed on a second part of the first region, wherein the first resonance coil is spaced apart from the second resonance coil by a predetermined interval. 
     In addition, an opening is formed on a lower surface of the base in an overlapping region of the first resonance coil and the second resonance coil. 
     In addition, the first part of the first region overlaps with a movement range of the first conductor corresponding to a stroke of the first lens assembly in a first direction, and the second part of the first region is a portion overlapping with a movement range of the second conductor corresponding to the stroke of the second lens assembly in the first direction, and the movement range of the first conductor does not overlap with the movement range of the second conductor in the first direction. 
     In addition, the first resonance coil is spaced apart from the first conductor by a first distance, the second resonance coil is spaced apart from the second conductor by a second distance, and wherein each of the first and second distances satisfies a range of 1.0 mm to 2.0 mm. 
     Advantageous Effects 
     According to the embodiment, the first barrel assembly  121  and the first mover  122 , which are separately formed and assembled, are separately adopted, without disposing the driving portion on the lens barrel so that the movement-related operation is performed in the lens barrel itself. Accordingly, design easiness of the first barrel assembly  121  and the first mover  122  may be improved. That is, the first barrel assembly  121  in the embodiment may be designed in consideration of only the lens specifications, the first mover  122  only needs to be designed in consideration of matters related to the movement, and accordingly, design easiness can be improved. 
     In addition, in the prior art, when the reliability of the actuator is evaluated, since all movement-related parts such as a magnet or a ball are disposed in the first lens barrel, and as described above, the reliability evaluation of the actuator was performed only in a state in which all parts such as the first lens barrel, the magnet, and the ball were combined. Accordingly, in the prior art, when a problem occurs in the performance of the actuator, the lens barrel itself must be discarded, resulting in costly waste. 
     On the other hand, according to the embodiment, the first mover  122  and the first barrel assembly  121  are designed separately. In this case, when evaluating the reliability of the actuator in the embodiment, the reliability evaluation related to the movement of the first mover  122  may be performed in a state in which the first barrel assembly  121  is not coupled to the first mover  122 , and accordingly, the ease of reliability evaluation can be improved. In addition, when a problem occurs in the reliability evaluation of the first mover  122 , only the first mover  122  needs to be discarded, and accordingly, the manufacturing cost can be significantly reduced. 
     In addition, in the embodiment, the position of the lens assembly is sensed through an inductive change instead of the Hall sensor for detecting the position of the lens assembly in the prior art, and accordingly, it is possible to increase the position detection accuracy of the lens assembly, thereby improving the operation reliability of the camera module. 
     In addition, in the embodiment, the movement positions of the first lens assembly and the second lens assembly are sensed using the first resonator and the second resonator, and accordingly, it is possible to provide a position detection sensor having excellent linearity and hysteresis even when the lens movement distance is increased. 
     According to the camera module according to the embodiment, there is a technical effect that can solve the problem of friction torque generation during zooming (zooming). 
     For example, in the embodiment, as the lens assembly is driven in a state in which the first guide portion and the second guide portion, which are precisely numerically controlled in the base, are driven, frictional resistance can be reduced by reducing frictional torque, and accordingly there are technical effects such as improvement of driving force during zooming, reduction of power consumption, and improvement of control characteristics. 
     Accordingly, according to the embodiment, when zooming, there is a complex technical effect that can significantly improve image quality or resolution by minimizing the friction torque and preventing the occurrence of a lens tilt or a lens decenter or a phenomenon in which the lens group and a central axis of the image sensor are not aligned. 
     In addition, the camera module according to the embodiment may align the plurality of lens groups by solving the problem of lens decenter or tilt during zooming, and through this, there is a technical effect of remarkably improving image quality or resolution by preventing a change in the angle of view or defocusing. 
     For example, according to the embodiment, the first guide portion includes the first-first rail and the first-second rail, so that the first-first rail and the first-second rail guide the first lens assembly, accordingly, there is a technical effect that can increase the alignment accuracy. 
     In addition, by providing two rails per lens assembly, there is a technical effect of ensuring accuracy with the other one even when one of the rails is misaligned. 
     In addition, according to the embodiment, by providing two rails per lens assembly, when a ball friction force issue, which will be described later, occurs in one of the rails, the rolling operation can be smoothly performed in the other rail, and accordingly, there is a technical effect that can secure the driving force. 
     In addition, according to the embodiment, by providing two rails per lens assembly, it is possible to secure a wide gap between the balls to be described later, through this, driving force can be improved, magnetic field interference can be prevented, and there is a technical effect of preventing tilt of the lens assembly. 
     In the prior art, when the guide rail is disposed on the base itself, a gradient occurs depending on the injection direction, so there is a difficulty in dimensional management, and there is a technical problem in that the friction torque increases and the driving force decreases when it is not properly injected. 
     On the other hand, according to the embodiment, the guide rail is not disposed on the base itself, but the first guide portion and the second guide portion are separately formed and assembled separately from the base, and this has a special technical effect that can prevent the generation of gradients depending on the injection direction. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a camera module according to an embodiment. 
         FIG. 2  is a perspective view in which some components are omitted from the camera module according to the embodiment shown in  FIG. 1 . 
         FIG. 3  is an exploded perspective view in which some components are omitted from the camera module according to the embodiment shown in  FIG. 1 . 
         FIG. 4  is an enlarged perspective view of a guide portion in the camera module according to the embodiment. 
         FIG. 5 a    is an exploded perspective view of a first lens assembly in the camera module according to the embodiment shown in  FIG. 3 . 
         FIG. 5 b    is a perspective view in which the driving portion is coupled to the lens portion and the mover shown in  FIG. 5   a.    
         FIG. 5 c    is a perspective view of a first lens assembly in which a lens portion and a mover are coupled according to an embodiment; 
         FIG. 5 d    is a perspective view in which a ball is coupled to the first lens assembly. 
         FIG. 6  is a view showing an example of driving a camera module according to an embodiment. 
         FIG. 7  is a view showing a lower portion of the first lens assembly in the camera module according to the embodiment. 
         FIG. 8  is a perspective view of a third lens assembly in the camera module according to the embodiment shown in  FIG. 3  in a first direction. 
         FIG. 9  is a perspective view of the third lens assembly  140  shown in  FIG. 8  in the second direction. 
         FIG. 10 a    is a perspective view of a base in the camera module according to the embodiment shown in  FIG. 3  in a first direction. 
         FIG. 10 b    is a perspective view of the base shown in  FIG. 10A  in a second direction. 
         FIG. 11  is a perspective view of a guide cover in the camera module according to the embodiment shown in  FIG. 3 . 
         FIG. 12 a    is a perspective view showing a first substrate in a first state in a camera module according to an embodiment. 
         FIG. 12 b    is a plan view of the first substrate of  FIG. 12 a    in a second state. 
         FIG. 12 c    is a circuit diagram showing an equivalent circuit of a first resonator disposed on a first substrate in a camera module according to an embodiment. 
         FIG. 13  is a view for explaining an operation principle of the first and second resonators according to the embodiment. 
         FIG. 14  is a cross-sectional view taken along line A-A′ in the camera module of  FIG. 1 . 
         FIG. 15  is a view showing a change in characteristics of a resonator according to a resonance frequency according to an embodiment. 
         FIG. 16  is a view for explaining a position sensing operation of the lens assembly according to the embodiment. 
         FIG. 17  is a graph showing a positional relationship of a lens assembly corresponding to an output value of an inductance digital converter (LDC) according to an embodiment. 
         FIG. 18 a    is a view showing various embodiments of a shape of a conductor in a camera module according to an embodiment. 
         FIG. 18 b    is a view for explaining a problem in the case where the conductor has a rectangular shape. 
         FIG. 19 a    is a cross-sectional view schematically showing a resonator according to an embodiment. 
         FIG. 19 b    is a plan view of the resonator shown in  FIG. 19   a.    
         FIG. 20 a    is a cross-sectional view schematically showing a resonator according to another exemplary embodiment. 
         FIG. 20 b    is a view specifically showing a resonance coil in the resonator shown in  FIG. 20   a.    
         FIG. 20 c    is an equivalent circuit diagram of the resonator shown in  FIGS. 20 a    and  20   b.    
         FIG. 21  is a block diagram showing a resonator according to another exemplary embodiment. 
         FIGS. 22 a  to 22 f    are plan views showing layer-by-layer structure of  FIG. 21 . 
         FIG. 22 g    is a view for explaining a planar shape of the receiving coil shown in  FIGS. 22 a    to  22   f.    
         FIG. 23  is a view showing an equivalent circuit diagram of the resonance coil shown in  FIG. 21 . 
         FIG. 24  is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied. 
     
    
    
     MODES OF THE INVENTION 
     Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and, as long as it is within the scope of the technical spirit of the present invention, one or more of the components may be selectively combined and substituted between the embodiments. 
     In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as meanings that can be generally understood by those of ordinary skill in the art to which the present invention pertains unless explicitly defined and described, and the meanings of commonly used terms such as predefined terms may be interpreted in consideration of the contextual meaning of the related art. In addition, 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 may also include the plural unless specifically stated in the phrase, and when it is described as “A and (and) at least one (or more than one) of B and C”, it may include one or more of all combinations that can be combined with A, B, and C. In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. 
     These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component by the term. And, when it is described that a component is ‘connected’, ‘coupled’ or ‘contacted’ to another component, the component is not only directly connected, coupled or contacted to the other component, but also with the component it may also include a case of ‘connected’, ‘coupled’ or ‘contacted’ due to another element between the other elements. 
     In addition, when it is described as being formed or disposed on “above (on) or below (under)” of each component, the above (on) or below (under) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components. In addition, when expressed as “above (up) or below (under)”, it may include not only the upward direction but also the meaning of the downward direction based on one component. 
     EMBODIMENT 
       FIG. 1  is a perspective view of a camera module according to an embodiment,  FIG. 2  is a perspective view in which some components are omitted from the camera module according to the embodiment shown in  FIG. 1 , and  FIG. 3  is an exploded perspective view in which some components are omitted from the camera module according to the embodiment shown in  FIG. 1 . 
     Referring to  FIG. 1 , a camera module  100  according to an embodiment may include a base  110 , a substrate  160  disposed on an outer side of the base  110 , a driver IC  165  disposed on one surface of the substrate  160 , a first lens assembly  120 , a second lens assembly  130 , a third lens assembly  140 , a driving portion  170 , and a guide cover  190 . 
       FIG. 2  is a perspective view in which the base  110 , the substrate  160 , the guide cover  190 , and the driver IC  165  are omitted in  FIG. 1 , and referring to  FIG. 2 , the camera module according to the embodiment may include a guide portion  150  including a first guide portion  151  and a second guide portion  152 , a third driving portion  171 , the fourth driving portion  172 , a first lens assembly  120 , and a second lens assembly  130 . 
     The third driving portion  171  and the fourth driving portion  172  may include a coil or a magnet. 
     For example, when the third driving portion  171  and the fourth driving portion  172  include a coil, the third driving portion  171  may include a first coil portion  171   a  and a first yoke  171   b , and, the fourth driving portion  172  may include a second coil portion  172   a  and a second yoke  172   b.    
     Alternatively, the third driving portion  171  and the fourth driving portion  172  may include a magnet. 
     In the xyz-axis direction shown in  FIG. 3 , the z-axis means an optical axis direction or a direction parallel to this, the xz plane represents a ground, and the x-axis means a direction perpendicular to the z-axis in the ground (xz plane), and the y-axis may mean a direction perpendicular to the ground. 
     Referring to  FIG. 3 , the camera module  100  according to the embodiment may include a base  110 , a first guide portion  151  disposed on one side of the base, a second guide portion  152  disposed on the other side of the base  110 , a first lens assembly  120  corresponding to the first guide portion  151 , a second lens assembly  130  corresponding to the second guide portion  152 , a first ball  181  (to be described later) disposed between the first guide portion and the first lens assembly  120 , and a second ball (to be described later) disposed between the second guide portion  152  and the second lens assembly  130 . 
     In addition, the embodiment may include a third lens assembly  140  disposed in front of the first lens assembly  120  in the optical axis direction. 
     Hereinafter, specific features of the camera module according to the embodiment will be described in detail with reference to attached drawings. 
     &lt;Guide Portion&gt; 
     Referring to  FIGS. 2 and 3 , in the embodiment, the first guide portion  151  is disposed adjacent to a first sidewall ( 111 , to be described later) of the base  110 , and a second guide portion  152  disposed adjacent to a second sidewall  112  (described later) opposite to the first sidewall  111  of the base  110 . 
     The first guide portion  151  may be disposed between the first lens assembly  120  and the first sidewall  111  of the base  110 . 
     The second guide portion  152  may be disposed between the second lens assembly  130  and the second sidewall  112  of the base  110 . The first sidewall  111  and the second sidewall  112  of the base  110  may be disposed to face each other. 
     According to the embodiment, as the lens assembly is driven in a state in which the first guide portion  151  and the second guide portion  152 , which are precisely numerically controlled in the base  110 , are driven, frictional resistance can be reduced by reducing frictional torque, and accordingly there are technical effects such as improvement of driving force during zooming, reduction of power consumption, and improvement of control characteristics. 
     Accordingly, according to the embodiment, when zooming, there is a complex technical effect that can significantly improve image quality or resolution by minimizing the friction torque and preventing the occurrence of a lens tilt or a lens decenter or a phenomenon in which the lens group and a central axis of the image sensor are not aligned. 
     In the prior art, when the guide rail is disposed on the base itself, a gradient occurs depending on the injection direction, so there is a difficulty in dimensional management, and there is a technical problem in that the friction torque increases and the driving force decreases when it is not properly injected. 
     In addition, in the prior art, the base and the guide rail are integrally formed. In this case, the base may be formed of plastic that can be molded by injection, and thus the guide rail is also made of plastic. However, the camera module is exposed to various dangerous situations (e.g., falling) in use environment, thereby causing a reliability problem. For example, when a dangerous situation such as a fall occurs in the environment in which the camera module is used, a problem such as nicking of the guide rail occurs, and thus the lens assembly cannot be moved to an accurate position. 
     On the other hand, according to the embodiment, instead of arranging the guide rail on the base itself, the first guide portion  151  and the second guide portion  152  that are separately formed and assembled are separately adopted, and thereby, there is a special technical effect that can prevent the generation of gradient depending on the injection direction. In addition, as the base  110  and the guide portions  151  and  152  are separately employed, the base  110  may be formed of plastic, and the guide portions  151  and  152  may be formed of a metal strong against impact. 
     The base  110  may be injected in the z-axis direction. When the rail is integrally formed with the base in the prior art, there is a problem in that a straight line of the rail is distorted due to a gradient occurring while the rail is injected in the z-axis. 
     According to the embodiment, by the first guide portion  151 , the second guide portion  152  is injected separately from the base  110 , it is possible to significantly prevent the generation of gradients compared to the prior art, so precise injection is possible, and there is a special technical effect that can prevent the generation of gradients due to injection. 
     In the embodiment, a length of the first guide portion  151  and the second guide portion  152  is shorter than that of the base  110  as they are injected in the X-axis direction. In this case, when the rails  151   a  and  152   a  are disposed on the first guide portion  151  and the second guide portion  152 , it is possible to minimize the generation of gradient during injection, and there is a technical effect that the straight line of the rail is less likely to be distorted. 
       FIG. 4  is an enlarged perspective view of a guide portion in the camera module according to the embodiment. 
     Referring to  FIG. 4 , the first guide portion  151  may include a single or a plurality of first rails  151   a . Also, the second guide portion  152  may include a single or a plurality of second rails  152   a.    
     For example, the first rail  151   a  of the first guide portion  151  may include a first-first rail  151   b  and a first-second rail  151   c . The first guide portion  151  may include a first support portion  151   d  between the first-first rail  151   b  and the first-second rail  151   c.    
     Specifically, the first guide portion  151  may include a first support portion  151   d . In addition, the first-first rail  151   b  of the first guide portion  151  may be disposed to protrude from an upper end of an inner surface of the first support portion  151   d  in the direction in which the second guide portion  152  is disposed (or the direction in which the second sidewall  112  of the base  110  is disposed). In addition, the first-second rail  151   c  of the first guide portion  151  may be disposed to protrude from a lower end of the inner surface of the first support portion  151   d  in the direction in which the second guide portion  152  is disposed (or the direction in which the second sidewall  112  of the base  110  is disposed). 
     According to the embodiment, by providing two rails per lens assembly, there is a technical effect of ensuring accuracy with the other one even when one of the rails is misaligned. 
     In addition, according to the embodiment, by providing two rails per lens assembly, when a ball friction force issue, which will be described later, occurs in one of the rails, the rolling operation can be smoothly performed in the other rail, and accordingly, there is a technical effect that can secure the driving force. 
     The first rail  151   a  may be connected from one surface disposed in the optical axis direction of the first guide portion  151  to the other surface. 
     A camera actuator and the camera module including the same according to the embodiment may align the plurality of lens groups by solving the problem of lens decenter or tilt during zooming, and through this, there is a technical effect of remarkably improving image quality or resolution by preventing a change in the angle of view or defocusing. 
     For example, according to the embodiment, the first guide portion  151  includes a first-first rail  151   b  and a first-second rail  151   c , since the first-first rail  151   b  and the first-second rail  151   c  guide the first lens assembly  120 , there is a technical effect of increasing alignment accuracy. 
     In addition, according to an embodiment, by providing two rails per lens assembly, it is possible to secure a wide spacing between the balls to be described later, this can improve the driving force, and there is a technical effect of preventing magnetic field interference and preventing tilt in a stopping or moving state of the lens assembly. 
     In addition, the first guide portion  151  may include a first guide protrusion extending in a lateral direction perpendicular to the extending direction of the first rail  151   a.    
     That is, the first guide portion  151  may include a first guide protrusion protruding from an outer surface of the first support portion  151   d  in a direction opposite to the direction in which the first rail  151   a  is disposed. 
     The first guide protrusion includes a first-first guide protrusion  151   e  protruding from the upper end of the outer surface of the first support portion  151   d  in a direction in which the first sidewall  111  of the base  110  is disposed, and a first-second guide protrusion  151   f  protruding from the lower end of the outer surface of the first support portion  151   d  in a direction in which the first sidewall  111  of the base  110  is disposed. The positions of the first-first guide protrusion  151   e  and the first-second guide protrusion  151   f  may be fixed as they are coupled to a guide coupling portion (described later) provided on the base  110 . This will be described later. 
     Also, referring to  FIG. 4 , the second guide portion  152  in the embodiment may include a single or a plurality of second rails  152   a.    
     For example, the first rail  152   a  of the second guide portion  152  may include a second-first rail  152   b  and a second-second rail  152   c . The second guide portion  152  may include a second support portion  152   d  between the second-first rail  152   b  and the second-second rail  152   c.    
     Specifically, the second guide portion  152  may include a second support portion  152   d . In addition, the second-first rail  152   b  of the second guide portion  152  may be disposed to protrude from an upper end of an inner surface of the second support portion  152   d  in the direction in which the first guide portion  151  is disposed (or the direction in which the first sidewall  111  of the base  110  is disposed). In addition, the second-second rail  152   c  of the second guide portion  152  may be disposed to protrude from a lower end of the inner surface of the second support portion  152   d  in the direction in which the first guide portion  151  is disposed (or the direction in which the first sidewall  112  of the base  110  is disposed). 
     According to the embodiment, by providing two rails per lens assembly, there is a technical effect of ensuring accuracy with the other one even when one of the rails is misaligned. 
     In addition, according to the embodiment, by providing two rails per lens assembly, when a ball friction force issue, which will be described later, occurs in one of the rails, the rolling operation can be smoothly performed in the other rail, and accordingly, there is a technical effect that can secure the driving force. 
     The second rail  152   a  may be connected from one surface disposed in the optical axis direction of the second guide portion  152  to the other surface. 
     A camera actuator and the camera module including the same according to the embodiment may align the plurality of lens groups by solving the problem of lens decenter or tilt during zooming, and through this, there is a technical effect of remarkably improving image quality or resolution by preventing a change in the angle of view or defocusing. 
     For example, according to the embodiment, the second guide portion  152  includes a second-first rail  152   b  and a second-second rail  152   c , since the second-first rail  152   b  and the second-second rail  152   c  guide the second lens assembly  130 , there is a technical effect of increasing alignment accuracy. 
     In addition, according to an embodiment, by providing two rails per lens assembly, it is possible to secure a wide spacing between the balls to be described later, this can improve the driving force, and there is a technical effect of preventing magnetic field interference and preventing tilt in a stopping or moving state of the lens assembly. 
     In addition, the second guide portion  152  may include a second guide protrusion extending in a lateral direction perpendicular to the extending direction of the second rail  152   a.    
     That is, the second guide portion  152  may include a second guide protrusion protruding from an outer surface of the second support portion  152   d  in a direction opposite to the direction in which the second rail  152   a  is disposed. 
     The second guide protrusion includes a second-first guide protrusion  152   e  protruding from the upper end of the outer surface of the second support portion  152   d  in a direction in which the second sidewall  112  of the base  110  is disposed, and a second-second guide protrusion (not shown) protruding from the lower end of the outer surface of the second support portion  152   d  in a direction in which the second sidewall  112  of the base  110  is disposed. The positions of the second-first guide protrusion  152   e  and the second-second guide protrusion may be fixed as they are coupled to a guide coupling portion (described later) provided on the base  110 . This will be described later. 
     Meanwhile, the first rail  151   a  of the first guide portion  151  may include a first-first rail  151   b  having a first shape R 1  and a first-second rail  151   c  having a second shape R 2 . 
     In addition, the second rail  152   a  of the second guide portion  152  may include a second-first rail  152   b  having a first shape R 1  and a second-second rail  152   c  having a second shape R 2 . 
     In this case, the first shape R 1  and the second shape R 2  of the first guide portion  151  may be different from each other. 
     For example, the first shape R 1  of the first guide portion  151  and the second guide portion  152  may have a straight shape. In other words, the first-first rail  151   b  and the second-first rail  152   b  may have a flat plate shape. 
     Also, the second shape R 2  of the first guide portion  151  and the second guide portion  152  may have an L-shape. However, this is only an embodiment, and the first shape R 1  and the second shape R 2  of the first guide portion  151  and the second guide portion  152  may be deformed into various shapes according to embodiments. 
     Meanwhile, although not shown in the drawing, at least one of rib (not shown) may be respectively disposed in a region adjacent to the first-second rail  151   c  and the second-second rail  152   c  among the inner surfaces of the first support portion  151   d  and the second support portion  152   d.    
     In the prior art, as the number of injection-molded products increases or the thickness of the injection-molded products increases, shrinkage occurs, making it difficult to manage dimensions, and when an amount of injection-molded products is reduced, contradictions such as weakening of strength occur. 
     According to this embodiment, by arranging at least one rib between the first support portion  151   d  and the first-second rails  151   c  and between the second support portion  152   d  and the second-second rails  152   c , and there is a complex technical effect that can increase the accuracy of numerical management and secure strength at the same time by reducing the amount of injection molded product. 
     Meanwhile, the first guide portion  151  may include a first open region OR 1 . Also, the second guide portion  152  may include a second open region OR 2 . The first open region OR 1  may be an opening exposing the third driving portion  171 . Preferably, the first open region OR 1  may be an opening exposing the first coil portion  171   b  constituting the third driving portion  171 . Preferably, the first open region OR 1  may overlap and align with the first coil portion  171   b  in the x-axis direction. 
     The second open region OR 2  may be an opening exposing the fourth driving portion  172 . Preferably, the second open region OR 2  may be an opening exposing the second coil portion  172   b  constituting the fourth driving portion  172 . Preferably, the second open region OR 2  may overlap and be aligned with the second coil portion  172   b  in the x-axis direction. 
     &lt;First and Second Lens Assemblies and Balls&gt; 
     Next,  FIG. 5 a    is an exploded perspective view of a first lens assembly  120  in the camera module according to the embodiment shown in  FIG. 3 ,  FIG. 5 b    is a perspective view in which the driving portion is coupled to the lens portion and the mover shown in  FIG. 5 a   ,  FIG. 5 c    is a perspective view of a first lens assembly  120  in which a lens portion and a mover are coupled according to an embodiment, and  FIG. 5 d    is a perspective view in which a ball is coupled to the first lens assembly  120 . 
     Referring briefly to  FIG. 3 , the embodiment may include a first lens assembly  120  moving along the first guide portion  151  and a second lens assembly  130  moving along the second guide portion  152 . 
     Referring back to  FIGS. 5 a  to 5 d   , the first lens assembly  120  may include a first barrel assembly  121  including a first lens barrel  121   a  in which a first lens  121   b  is disposed, a first mover  122  in which a first driving portion  173  is disposed. The first lens barrel  121   a  and the first mover  122  may be a first housing, and the first housing may have a barrel or barrel shape. The first driving portion  173  may be a magnet driving portion, but is not limited thereto, and may be a coil driving portion including a coil in some cases. 
     Meanwhile, although only the first lens assembly  120  is showed in the drawings, the second lens assembly  130  may also have a structure corresponding to the first lens assembly  120 . That is, the second lens assembly  130  may include a second barrel assembly (not shown) including a second lens barrel in which a second lens (not shown) is disposed, and a second mover (not shown) in which a second driving portion (not shown) is disposed. Here, the second lens barrel and the second mover may be a second housing, and the second housing may have a barrel or barrel shape. The second driving portion may be a magnet driving portion, but is not limited thereto, and may be a coil driving portion including a coil in some cases. 
     The first driving portion  173  may correspond to the two first rails  151   a , and the second driving portion may correspond to the two second rails  152   a.    
     In an embodiment, the first barrel assembly  121  and the first mover  122  may be separated from each other. To this end, the first lens barrel  121   a  constituting the first barrel assembly  121  has a receiving space for receiving the first lens  121   b  therein, and an outer surface protrudes in a direction in which the first mover  122  is disposed, and includes a first yoke receiving portion  121   c  for receiving one configuration of the first driving portion  173  in the protruding interior. A third yoke  173   b  constituting the first driving portion  173  may be received in the first yoke receiving portion  121   c . The first yoke receiving portion  121   c  may also be referred to as a protruding portion or protrusion coupled to the first mover  122 . In addition, a second yoke receiving portion (not shown) in which the fourth yoke is received may also be formed in the second mover corresponding to the second lens assembly  130 . 
     Meanwhile, the first mover  122  includes a first coupling portion  122   a . The first coupling portion  122   a  may have a receiving space therein. Preferably, the receiving space of the first coupling portion  122   a  may be formed to correspond to the shape of an outer surface of the yoke receiving portion  121   c . The yoke receiving portion  121   c  may be fitted and coupled to the first coupling portion  122   a.    
     In the camera module according to the embodiment, the first lens assembly  120  as a component of the camera actuator may be assembled after the first mover  122  and the first barrel assembly  121  are not integrally formed, but are separately formed. 
     That is, in the first lens assembly  120  in the prior art, the first mover and the first barrel assembly are integrally formed. In this case, the first barrel assembly should be manufactured in consideration of many factors during manufacturing. That is, in the prior art, the first barrel assembly is designed in consideration of various factors such as the shape and size of the first lens barrel based on the specification of the first lens. However, when the first mover and the first barrel assembly are integrally formed as described above, in addition to the lens specifications, matters related to the movement that the first mover must have should be considered in consideration of the design of the first lens barrel, and accordingly, there was a difficulty in designing the first barrel assembly. That is, in the prior art, when designing the lens barrel, in addition to the lens specification, the movement-related configuration such as the ball arrangement position or the magnet position must also be considered, and accordingly, there were too many considerations, which made the design difficult. 
     On the other hand, according to the embodiment, the driving portion is disposed on the lens barrel so that movement-related operations are not performed in the lens barrel itself, and by separately employing the first barrel assembly  121  and the first mover  122  that are separately formed and assembled, the easiness of designing the first barrel assembly  121  and the first mover  122  may be improved. That is, the first barrel assembly  121  in the embodiment may be designed in consideration of only the lens specifications, the first mover  122  only needs to be designed in consideration of matters related to the movement, and accordingly, design easiness can be improved. 
     In addition, in the prior art, when the reliability of the actuator is evaluated, since all movement-related parts such as a magnet or a ball are disposed in the first lens barrel, and as described above, the reliability evaluation of the actuator was performed only in a state in which all parts such as the first lens barrel, the magnet, and the ball were combined. Accordingly, in the prior art, when a problem occurs in the performance of the actuator, the lens barrel itself must be discarded, resulting in costly waste. 
     On the other hand, according to the embodiment, the first mover  122  and the first barrel assembly  121  are designed separately. In this case, when evaluating the reliability of the actuator in the embodiment, the reliability evaluation related to the movement of the first mover  122  may be performed in a state in which the first barrel assembly  121  is not coupled to the first mover  122 , and accordingly, the ease of reliability evaluation can be improved. In addition, when a problem occurs in the reliability evaluation of the first mover  122 , only the first mover  122  needs to be discarded, and accordingly, the manufacturing cost can be significantly reduced. 
     In addition, the first mover  122  includes a second coupling portion  122   b  to which the first magnet  173   a  of the first driving portion  731  is coupled, and a first coupling portion  122   a  to which a yoke receiving portion  121   c  received the third yoke  173   b  therein is coupled, and are respectively disposed to opposite surfaces with respect to a frame. Accordingly, a gap between the first magnet  173   a  and the third yoke  173   b  can be minimized, due to this, the magnetic force between the first coil  171   b  and the first magnet  173   a  is strengthened to maximize the driving force of the first mover  122 . 
     Meanwhile, in the embodiment, the first mover  122  and the second mover  132  (refer to  FIG. 14 ) may be driven using a single or a plurality of balls. For example, the embodiment may include a first ball  181  disposed between the first guide portion  151  and the first mover  122  of the first lens assembly  120 , and a second ball  185 ,  186  disposed between the second guide portion  152  and the second mover  132  of the second lens assembly  130 . 
     For example, the first ball  181  of the embodiment includes a single or a plurality of first-first balls  182  disposed on an upper side of the first mover  122  and a single or a plurality of first-second balls  183  disposed on a lower side of the first mover  122 . 
     In an embodiment, the first-first ball  182  of the first balls  181  moves along the first-first rail  151   b  that is one of the first rails  151   a , and the first-second ball  183  of the first balls  181  may move along a first-second rail  151   c  that is the other one of the first rails  151   a.    
     A camera actuator and the camera module the same according to the embodiment may align the plurality of lens groups by solving the problem of lens decenter or tilt during zooming, and through this, there is a technical effect of remarkably improving image quality or resolution by preventing a change in the angle of view or defocusing. 
     For example, according to the embodiment, the first guide portion includes a first-first rail and a first-second-2 rail, and the first-first rail and the first-second rail guide the first lens assembly  120 , and accordingly, when the first lens assembly  1120  moves, there is a technical effect of increasing the accuracy of the optical axis alignment with the second lens assembly  130 . 
     Meanwhile, in the embodiment, the first mover  122  of the first lens assembly  120  may include a first arrangement portion  122   c  in which the first ball  181  is disposed. In addition, the second mover  132  of the second lens assembly  130  may include a second arrangement portion  187  (refer to  FIG. 14 ) in which the second ball  185  is disposed. 
     The first arrangement portions  122   c  of the first mover  122  of the first lens assembly  120  may be plural. Preferably, the first arrangement portion  122   c  may include a first-first arrangement portion  122   c   1  in which the first-first ball  182  of the first balls  181  is disposed, and a first-second arrangement portion  122   c   2  in which the first-second ball  183  of the first balls  181  is disposed. The second arrangement portion of the second mover  132  of the second lens assembly  130  may be plural. Preferably, the second arrangement portion may include a second-first arrangement portion  187  in which the second-first ball  185  of the second balls is disposed, and a second-second arrangement portion (not shown) in which the second-second ball  186  of the second balls is disposed 
     In this case, the first-first arrangement portion  122   c   1  and the first-second arrangement portion  122   c   2  may have different shapes from each other. For example, the first-first arrangement portion  122   c   1  may be spaced apart from each other by a predetermined interval, and may have a groove shape into which a plurality of first-first balls  182  are respectively inserted. In this case, a distance between the plurality of grooves constituting the first-first arrangement portion  122   c   1  may be longer than a thickness of the first lens barrel  121   a  based on the optical axis direction. 
     Also, in an embodiment, the first-second arrangement portion  122   c   2  may have a rail shape. In other words, the first-second arrangement portion  122   c   2  may be a ball rail extending in the optical axis direction. In this case, the first-second arrangement portion  122   c   2  may have an L-shape, but is not limited thereto. For example, the rail of the first-second arrangement portion  122   c   2  may be in a U-shape or V-shape or a shape in contact with the plurality of first-second balls  183  at two or three points, other than the L shape. 
     In addition, the first-second ball  183  of the first balls  181  is disposed on the rail of the first-second arrangement portion  122   c   2 . At this time, when the first-second balls  183  composed of a plurality are simply disposed on the rail of the first-second arrangement portion  122   c   2 , a change may occur in an interval between the plurality of first-second balls  183  according to the movement of the first lens assembly  120 . In addition, when the plurality of first-second balls  183  come into contact with each other according to a change in the spacing between the plurality of first-second balls  183 , movement characteristics of the first lens assembly  120  may be affected, and a position shift of the first lens assembly  120  may occur. Accordingly, the first ball guide portion  184  may be disposed between the first-second arrangement portion  122   c   2  and the first-second rail  151   c . The first ball guide portion  184  may be a plate-shaped member. The first ball guide portion  184  may include a groove (not shown) into which the plurality of first-second balls  183  are inserted. In addition, the plurality of first-second balls  183  may be inserted into the groove of the first ball guide portion  184 , and disposed between the first-second arrangement portion  122   c   2  of the first mover  122  and the first-second rail  151   c . In addition, a second ball guide portion  188  (refer to  FIG. 14 ) may be disposed between the second-second arrangement portion and the second-second rail. 
     Next,  FIG. 6  is a view showing an example of driving a camera module according to an embodiment. 
     Referring to  FIG. 6 , an interaction in which electromagnetic force DEM is generated between the first magnet  173   a  and the first coil portion  171   b  in the camera module according to the embodiment will be described. 
     As in  FIG. 6 , a magnetization method of the first magnet  173   a  in the camera module according to the embodiment may be a vertical magnetization method. For example, in the embodiment, both the N pole  173   a N and the S pole  173   a S of the first magnet  173   a  may be magnetized to face the first coil portion  171   b . Accordingly, the N pole  173   a N and the S pole  173   a S of the first magnet  173   a  may be respectively disposed on the first coil portion  171   b  to correspond to a region in which current flows in the y-axis direction perpendicular to the ground. 
     In the embodiment, when a magnetic force DM is applied in the direction opposite to the x-axis at the N pole  173   a N of the first magnet  173   a  and a current DE flows in the y-axis direction in the region of the first coil portion  171   b  corresponding to the N pole  173   a N, an electromagnetic force (DEM) acts in the z-axis direction according to Fleming&#39;s left hand rule. 
     In addition, in the embodiment, when a magnetic force DM is applied in the x-axis direction at the S pole  173   a S of the first magnet  173   a  and the current DE flows in the opposite direction to the y-axis perpendicular to the ground in the first coil portion  171   b  corresponding to the S pole  173   a S, an electromagnetic force (DEM) acts in the z-axis direction according to Fleming&#39;s left hand rule. 
     At this time, since the third driving portion  171  including the first coil portion  171   b  is in a fixed state, the first lens assembly  120  including a first mover  122  on which a first magnet  173   a  is disposed and a first lens barrel coupled to the first mover  122  may be moved backward and forward along the rail of the first guide portion  151  in a direction parallel to the z-axis direction by the electromagnetic force DEM according to the current direction. The electromagnetic force DEM may be controlled in proportion to the current DE applied to the first coil portion  171   b.    
     Similarly, in the camera module according to the embodiment, when an electromagnetic force (DEM) between the second magnet (not shown) and the second coil portion  172   b  is generated, the second lens assembly  130  may move along the rail of the second guide portion  152  horizontally to the optical axis. 
       FIG. 7  is a view showing a lower portion of the first lens assembly in the camera module according to the embodiment. 
     Referring to  FIG. 7 , the first lens assembly  120  includes a first conductor  123 . In addition, the second lens assembly  130  includes a second conductor (not shown). The first conductor  123  may be made of a metal material through which electricity may pass, and may include, for example, gold (Au), but is not limited thereto. 
     Specifically, the first conductor  123  is attached to a lower surface of the first lens assembly  120 . Specifically, the first conductor  123  is attached to the lower surface of the first lens barrel  121   a  constituting the first barrel assembly  121  of the first lens assembly  120 . 
     The first conductor  123  may have a shape whose width changes in the optical axis direction (z-axis direction). For example, the first conductor  123  may have a triangular shape in which the width linearly decreases or increases in the optical axis direction. A position of the first conductor  123  in the base  110  may change according to the movement of the first lens assembly  120 . The first conductor  123  may be a target for detecting the position of the first lens assembly  120 . In addition, the second conductor may have the same shape as the first conductor  123 , but is not limited thereto. For example, the first conductor  123  may have a triangular shape, and the second conductor  123  may have a rhombus shape. 
     Preferably, the first conductor  123  interferes with the magnetic field generated by the first resonator  161   a  (to be described later) disposed on a first substrate  161 . That is, an interfering magnetic field corresponding to the reverse direction of the magnetic field generated in the first resonator  161   a  is generated in the first conductor  123 . In addition, the interfering magnetic field reduces the inductance of the first resonator  161   a . In this case, the intensity of the interfering magnetic field generated in the first conductor  123  is changed according to the position of the first lens assembly  120 . At this time, the width of the first conductor  123  is changed toward the optical axis direction corresponding to the moving direction of the first lens assembly  120  as described above. Accordingly, the intensity of the interfering magnetic field generated by the first conductor  123  also increases or decreases as the first lens assembly  120  moves in the optical axis direction. 
     At this time, assuming that the first resonator  161   a  has a reference inductance, the first resonator  161   a  has a first inductance smaller than the reference inductance due to the interfering magnetic field generated from the first conductor  123  according to the position of the first lens assembly  120 . The position of the first conductor  123  may be detected based on the first inductance, and the position of the first lens assembly  120  may be detected based on the position of the first conductor  123 . 
     In addition, the second conductor disposed on the second lens assembly  130  interferes with the magnetic field generated by the second resonator  16   ba  (to be described later) disposed on a first substrate  161 . That is, an interfering magnetic field corresponding to the reverse direction of the magnetic field generated in the second resonator  161   b  is generated in the second conductor. In addition, the interfering magnetic field reduces the inductance of the second resonator  161   b . In this case, the intensity of the interfering magnetic field generated in the second conductor is changed according to the position of the second lens assembly  130 . At this time, the width of the second conductor is changed toward the optical axis direction corresponding to the moving direction of the second lens assembly  120  as described above. Accordingly, the intensity of the interfering magnetic field generated by the second conductor also increases or decreases as the second lens assembly  130  moves in the optical axis direction. 
     At this time, assuming that the second resonator  161   b  has a reference inductance, the second resonator  161   b  has a second inductance smaller than the reference inductance due to the interfering magnetic field generated from the second conductor according to the position of the second lens assembly  130 . The position of the second conductor may be detected based on the second inductance, and the position of the second lens assembly  130  may be detected based on the position of the second conductor. 
     Positions on the first conductor  123  and the second conductor, and a relationship between the first resonator  161   a  and the second resonator  161   b , and position sensing operation of the first lens assembly  120  and the second lens assembly  130  will be described in more detail below. 
     &lt;Third Lens Assembly&gt; 
     Next,  FIG. 8  is a perspective view of a third lens assembly in the camera module according to the embodiment shown in  FIG. 3  in a first direction, and  FIG. 9  is a perspective view of the third lens assembly  140  shown in  FIG. 8  in the second direction, and this is a perspective view from which the third lens was removed. 
     Referring to  FIG. 8 , in the embodiment, the third lens assembly  140  may include a third housing  142 , a third barrel  141 , and a third lens  143 . 
     In the embodiment, the third lens assembly  140  may include a barrel recess  142   r  on an upper end of the third barrel  141  so that the thickness of the third barrel  141  of the third lens assembly  140  can be uniformly matched. There is a complex technical effect that can increase the accuracy of numerical management by reducing the amount of injection molded products. 
     Also, according to an embodiment, the third lens assembly  140  may include a housing rib  142   a  and a housing recess  142   b  in the third housing  142 . 
     In the embodiment, the third lens assembly  140  includes a housing recess  142   b  in the third housing  142 , thereby reducing the amount of injection products to increase the accuracy of numerical management and at the same time providing the third housing  142  with the housing rib  142   a , there is a complex technical effect that can secure the strength. 
     Next, referring to  FIG. 9 , the third lens assembly  140  may include a single or a plurality of housing holes in the third housing  142 . For example, the housing hole may include a third regular hole  142   ha  and a third long hole  142   hb  around the third barrel  141  of the third housing  142 . 
     The housing hole may be coupled to a first protrusion (not shown) that may be provided on the first guide portion  151  or the base  110 , and a second protrusion that may be provided on the second guide portion  152  or the base  110  (not shown). 
     The third regular hole  142   ha  may be a circular hole, and the third long hole  142   hb  may have different diameters in a uniaxial direction and in a biaxial direction perpendicular thereto. For example, the third long hole  142   hb  may have a larger diameter in a y-axis direction perpendicular to the x-axis than a diameter in an x-axis direction horizontal to the ground. 
     The housing hole of the third lens assembly may include two third regular holes  142   ha  and two third long holes  142   hb.    
     The third regular hole  142   ha  may be disposed on the lower side of the third housing  142 , and the third long hole  142   hb  may be disposed on the upper side of the third housing  142 , but is not limited thereto. However, the present invention is not limited thereto, and the third long hole  142   hb  may be positioned in a diagonal direction to each other, and the third long hole  142   ha  may be positioned in a diagonal direction to each other. 
     In an embodiment, the third housing  142  of the third lens assembly  140  may include a single or a plurality of housing protrusions  142   p . In the embodiment, reverse insertion can be prevented by providing the housing protrusion  142   p  on an inner side the third housing  142 , and it can be prevented from being reversed left and right from being coupled to the base  110 . 
     The housing protrusion  142   p  may be plural, for example, four, but is not limited thereto. At this time, although not shown in the drawing, the housing protrusion  142   p  may be coupled to a side recess (not shown) disposed to protrude from the side surface of the base  110 . 
     &lt;Base&gt; 
     Next,  FIG. 10 a    is a perspective view of a base in the camera module according to the embodiment shown in  FIG. 3  in a first direction, and  FIG. 10 b    is a perspective view of the base shown in  FIG. 10A  in a second direction. 
     Referring to  FIG. 3 , a first guide portion  151 , a second guide portion  152 , a first lens assembly  120 , and a second lens assembly  130  are disposed in the base  110  according to the embodiment. The third lens assembly  140  may be disposed on one side of the base  110 . 
     Referring back to  FIG. 10 a   , the base  110  may have a shape in which the upper surface is removed in a rectangular parallelepiped shape having a space therein. 
     For example, the base  110  may include a first sidewall  111 , a second sidewall  112 , a third sidewall  113 , a fourth sidewall  114 , and a lower end of the first sidewall and a second sidewall  114 , and a base lower surface connecting between a lower end of the first sidewall  111  and a lower end of the second sidewall  112 . At this time, the base  110  in the figure has a form in which a base upper surface connecting between an upper end of the first sidewall and an upper end of the second sidewall is removed, but the present invention is not limited thereto, according to an embodiment, the base  110  may include a base upper surface (not shown). 
     For example, the base  110  may include a first sidewall  111  and a second sidewall  112  corresponding to the first sidewall  111 . For example, the second sidewall  112  may be disposed in a direction facing the first sidewall  111 . 
     Meanwhile, the first sidewall  111  may include a third open region OR 3 . Also, the second sidewall  112  may include a fourth open region OR 4 . The third open region OR 3  may be an opening exposing the third driving portion  171 . Preferably, the third open region OR 3  may be an opening exposing the first coil portion  171   b  constituting the third driving portion  171 . Preferably, the third open region OR 3  may overlap and be aligned with the first coil portion  171   b  and the first open region OR 1  of the first guide portion  151  in the x-axis direction. 
     The fourth open region OR 4  may be an opening exposing the fourth driving portion  172 . Preferably, the fourth open region OR 4  may be an opening exposing the second coil portion  172   b  constituting the fourth driving portion  172 . Preferably, the fourth open region OR 4  may overlap and align with the second coil portion  172   b  and the second open region OR 2  of the second guide portion  152  in the x-axis direction. 
     The base  110  further includes a third sidewall  113  disposed between the first sidewall  111  and the second sidewall and connecting the first sidewall  111  and the second sidewall  112 . The third sidewall  113  may be disposed in a direction perpendicular to the first sidewall  111  and the second sidewall  112 . 
     The first, second, and third sidewalls  111 ,  112 , and  113  may be formed in an integral injection type with each other or may have a combined configuration to each other. 
     Meanwhile, although not shown in the figure, a base protrusion (not shown) may be disposed on the fourth sidewall  114  of the base  110 . 
     A plurality of the base protrusions may be disposed on the fourth sidewall  114 . 
     The base protrusion may be coupled to a third regular hole and a third long hole of the third lens assembly  140 . 
     The fourth sidewall  114  may have an open shape, and thus may include a fifth open region (not shown). 
     The first guide portion  151 , the second guide portion  152 , the first lens assembly  120 , and the second lens assembly  130  may be detachably coupled to the inner side of the base  110  through the fifth open region. 
     An outer surface of the first sidewall  111  may include first base protrusions  111   a  and  111   b  protruding in the x-axis direction. For example, the first sidewall  111  may include a first-first base protrusion  111   a  and a first-second base protrusion  111   b  extending in the y-axis direction. In the embodiment, by providing the first-first base protrusion  111   a  and the first-second base protrusion  111   b  on the first sidewall  111 , when the first substrate  161  is assembled, epoxy or adhesive may be applied for bonding between the second rigid region RO 2  (to be described later) of the first substrate  161  and the base  110  to improve a strong bonding force. 
     Meanwhile, a lower end of the outer surface of the first sidewall  111  includes a plurality of first-third base protrusions  111   c  extending in the z-axis direction and spaced apart from each other by a predetermined interval. In addition, a space between the plurality of first-third base protrusions  111   c  may form a first recess  111   d . When the first substrate  161  is coupled to the base  110  through bending, the first flexible region FO 1  of the first substrate  161  may be positioned in the first recess  111   d , and accordingly, when the first substrate  161  is bent and coupled to the base  110  through bending, it may serve as a guide. 
     In addition, second recesses  111   e  may be formed in the first-first base protrusion  111   a  and the first-second base protrusion  111   b , respectively. The second recess  111   e  may serve as a guide when the first yoke  171   a  of the third driving portion  171  is coupled, and accordingly, the coupling force of the first yoke  171   a  may be improved. 
     The outer surface of the second sidewall  112  may include second base protrusions  112   a  and  112   b  protruding in the x-axis direction. For example, the second sidewall  112  may include a second-first base protrusion  112   a  and a second-second base protrusion  112   b  extending in the y-axis direction. In the embodiment, by providing the second-first base protrusion  112   a  and the second-second base protrusion  112   b  on the second sidewall  112 , When assembling the first substrate  161 , an epoxy or adhesive is applied for bonding between the third rigid region RO 3  (to be described later) of the first substrate  161  and the base  110 , thereby improving a strong bonding force. 
     On the other hand, the lower end of the outer surface of the second sidewall  112  includes a plurality of second-third base protrusions (not shown) extending in the z-axis direction and spaced apart from each other by a predetermined interval. In addition, a space between the plurality of second-third base protrusions may form a third recess (not shown). A second flexible region FO 2  of the first substrate  161  may be positioned in the third recess when the first substrate  161  is coupled to the base  110  through bending. Accordingly, the third recess may serve as a guide when the first substrate  161  is coupled to the base  110  through bending. 
     In addition, fourth recesses (not shown) may be formed in the second-first base protrusion  112   a  and the second-second base protrusion  112   b , respectively. The fourth recess may serve as a guide when the second yoke  172   a  of the fourth driving portion  172  is coupled, and accordingly, the coupling force of the second yoke  172   a  may be improved. 
     Meanwhile, a second coupling portion  112   c  may be disposed on an inner surface of the second sidewall  112 . In addition, a first coupling portion (not shown) may be disposed on an inner surface of the first sidewall  111 . 
     The first coupling portion may be coupled to the first guide protrusion of the first guide portion  151 , and accordingly, it is possible to guide the first guide portion  151  to be stably and firmly coupled to the base  110 . 
     In addition, the second coupling portion  112   c  is coupled to the second guide protrusion of the second guide portion  152 , accordingly, it is possible to guide the second guide portion  152  to be stably and firmly coupled to the base  110 . 
     The base  110  may include a base lower surface  115 . 
     An upper groove  115   a  may be formed on an upper surface of the base lower surface  115 . In the embodiment, by providing the upper groove  115   a  on the upper surface of the base lower surface  115 , and it is possible to prevent shrinkage during injection by maintaining a constant cross-sectional thickness for assembling the first guide portion  151  and the second guide portion  152 . 
     In addition, an upper recess  115   b  may be provided on the upper surface of the base lower surface  115 . A cover protrusion (described later) of the guide cover  190  may be fitted into the upper recess  115   b . In an embodiment, while maintaining the rigidity of the camera module, a guide cover  190  for protecting the first guide portion  151  and the second guide portion  152  may be provided, and the coupling force with the guide cover  190  may be increased by providing the upper recess  115   b  in the base  110 . 
     Also, referring to  FIG. 10 b   , the lower surface of the base lower surface  115  may include a first lower groove  115   c . In the embodiment, since the first lower groove  115   c  is provided on the lower surface of the base lower surface  115 , when the first substrate  161  is coupled, an epoxy or adhesive is applied for bonding between the first rigid region RO 1  of the first substrate  161  and the base  110 , thereby improving a strong bonding force. 
     On the other hand, the lower surface of the base lower surface  115  may include a second lower groove  115   d . In the embodiment, by providing the second lower groove  115   d  on the lower surface of the base lower surface  115 , when the first substrate  161  is coupled, bending of the first flexible region FO 1  may be guided while fixing the first flexible region FO 1  of the first substrate  161 . 
     In addition, the lower surface of the base lower surface  115  may include a third lower groove  115   e . In the embodiment, by providing the third lower groove  115   e  in the lower surface of the base lower surface  115 , when the first substrate  161  is coupled, bending of the second flexible region FO 2  may be guided while fixing the second flexible region FO 2  of the first substrate  161 . 
     In addition, a sixth open region OR 6  may be provided in the base lower surface  115 . The sixth open region OR 6  may expose the first rigid region RO 1  of the first substrate  161  coupled thereunder. For example, the sixth open region OR 6  may expose the first resonator  161   a  and the second resonator  161   b  disposed on the first rigid region RO 1  of the first substrate  161 . Preferably, the sixth open region OR 6  may overlap and be aligned with the first resonator  161   a , the second resonator  161   b , the first conductor  123 , and the second conductor in the y-axis direction. 
     &lt;Guide Cover&gt; 
       FIG. 11  is a perspective view of a guide cover  190  in the camera module according to the embodiment shown in  FIG. 3 . 
     The guide cover  190  may be disposed in the base  110 . The guide cover  190  may cover the first guide portion  151  and the second guide portion  152  disposed in the base  110 . 
     To this end, the guide cover  190  may include a first cover sidewall  191  and a second cover sidewall  192 . In addition, the guide cover  190  may include a cover lower surface  193  connecting a lower end of the first cover side wall  191  and a lower end of the second cover side wall  192 . 
     For example, the guide cover  190  may include a first cover sidewall  191  and a second cover sidewall  192  corresponding to the first cover sidewall  191 . For example, the second cover sidewall  192  may be disposed in a direction facing the first cover sidewall  191 . 
     Meanwhile, the first cover sidewall  191  may include a seventh open region OR 7 . Also, the second cover sidewall  192  may include an eighth open region OR 8 . The seventh open region OR 7  may be an opening exposing the first barrel assembly  121  of the first lens assembly  120 . Preferably, the eighth open region OR 8  may be an opening into which the first barrel assembly  121  is inserted. 
     The eighth open region OR 8  may be an opening exposing the second barrel assembly of the second lens assembly  130 . Preferably, the eighth open region OR 8  may be an opening into which the second barrel assembly is inserted. 
     The first cover sidewall  191  may be disposed on an inner side of the first mover  122  to cover the inner side of the first mover  122 . The second cover sidewall  192  may be disposed on an inner side the second mover to cover the inner side of the second mover. 
     In addition, the guide cover  190  may include a first extension portion  194  extending in the x-axis direction from the upper end of the first cover sidewall  191 . The first extension portion  194  may be disposed on the upper surface of the first mover  122  to cover the upper surface of the first mover  122 . 
     The guide cover  190  may include a second extension portion  195  extending in the x-axis direction from the upper end of the second cover sidewall  192 . The second extension portion  195  may be disposed on the upper surface of the second mover to cover the upper surface of the second mover. 
     In addition, the guide cover  190  may include a cover lower surface  193 . The cover lower surface  193  may be disposed in a direction perpendicular to the first cover sidewall  191  and the second cover sidewall  192 . 
     The first cover sidewall  191 , the second cover sidewall  192 , and the cover lower surface  193  may be formed in an integral injection shape with each other or may have a combined configuration. 
     The cover lower surface  193  may include a ninth open region OR 9 . The ninth open region OR 9  may expose a lower surface of the first barrel assembly  121  of the first lens assembly  120  disposed thereon and a lower surface of the second barrel assembly of the second lens assembly  130 . In addition, the cover lower surface  193  may expose the first resonator  161   a  and the second resonator  161   b  of the first substrate  161  disposed thereunder. 
     Meanwhile, a cover protrusion  193   a  may be provided on the cover lower surface  193 . The cover protrusion  193  may be fitted in the upper recess provided in the base  110 . 
     The embodiment arranges the guide cover  190  in the base  110 , and the strength of the camera module can be improved while protecting the first guide portion  151  and the second guide portion  152  through the guide cover  190 . 
     &lt;First Substrate&gt; 
       FIG. 12 a    is a perspective view showing a first substrate in a first state in a camera module according to an embodiment,  FIG. 12 b    is a plan view of the first substrate of  FIG. 12 a    in a second state, and  FIG. 12 c    is a circuit diagram showing an equivalent circuit of a first resonator disposed on a first substrate in a camera module according to an embodiment. 
     Referring to  FIG. 12 a   , the first substrate  161  may be connected to a predetermined power supply unit (not shown) and supplied to the third driving portion  171 , the fourth driving portion  172 , the first resonator  161   a , and the second resonator  161   b . The first substrate  161  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). Preferably, the first substrate  161  may be a rigid flexible printed circuit board (Rigid Flexible PCB). 
     Accordingly, the first substrate  161  may include a rigid region and a flexible region. Specifically, the first substrate  161  may include a rigid region on which components are disposed and a flexible region excluding the rigid region. 
     Specifically, the first substrate  161  may include a first rigid region RO 1  in which the first resonator  161   a  and the second resonator  161   b  are disposed, a second rigid region RO 2  in which the first coil portion  171   b  of the third driving portion  171 , a third rigid region RO 3  in which the second coil portion  172   b  of the fourth driving portion  172 , a first flexible region FO 1  between the first rigid region RO 1  and the second rigid region RO 2 , and a second flexible region FO 2  between the first rigid region RO 1  and the third rigid region RO 3 . 
     Each of the first rigid region RO 1 , the second rigid region RO 2 , the third rigid region RO 3 , the first flexible region FO 1 , and the second flexible region FO 2  may have a structure in which a plurality of insulating layers are stacked. 
     In this case, the plurality of insulating layers constituting the first rigid region RO 1 , the second rigid region RO 2 , and the third rigid region RO 3  may be rigid or flexible. For example, the plurality of insulating layers constituting the first rigid region RO 1 , the second rigid region RO 2 , and the third rigid region RO 3  may include glass or plastic. In detail, the plurality of insulating layers constituting the first rigid region RO 1 , the second rigid region RO 2 , and the third rigid region RO 3  may include chemically strengthened/semi-tempered glass such as soda lime glass or aluminosilicate glass, reinforced or flexible plastics such as polyimide (PI), polyethylene terephthalate (PET), propylene glycol (PPG), polycarbonate (PC), or sapphire. 
     In addition, the plurality of insulating layers constituting the first flexible region FO 1  and the second flexible region FO 2  may have a flexible characteristic having a stretchable characteristic. The insulating layer constituting the first flexible region FO 1  and the second flexible region FO 2  may be an insulating layer having a curved or bent characteristic. 
     Accordingly, the first substrate  161  may be bent while partially having a flat surface and partially having a curved surface. Preferably, the first flexible region FO 1  and the second flexible region FO 2  may be curved while having a random curvature, or may have a surface including a random curvature and may be bent or curved. 
     The first substrate  161  may be disposed on the outer side of each of the base lower surface  115 , the first sidewall  111 , and the second sidewall  112  of the base  110  by bending the first flexible region FO 1  and the second flexible region FO 2 . 
     The first rigid region RO 1  is a region in which the first resonator  161   a  and the second resonator  161   a  are disposed. The first rigid region RO 1  may be disposed on an outer side the base lower surface  115  of the base  110 . That is, the first rigid region RO 1  may be coupled to the first lower groove  115   c  provided in the base lower surface  115  of the base  110 . 
     The second rigid region RO 2  is a region in which the third driving portion  171  for moving the first lens assembly  120  is disposed. The second rigid region RO 2  may be disposed on an outer side the first sidewall  111  of the base  110 . That is, the second rigid region RO 2  may be coupled to the base  110  between the first-first base protrusion  111   a  and the first-second base protrusion  111   b  provided on the first sidewall  111  of the base  110 . 
     The third rigid region RO 3  is a region in which the fourth driving portion  172  for moving the second lens assembly  130  is disposed. The third rigid region RO 3  may be disposed on an outer side the second sidewall  112  of the base  110 . That is, the third rigid region RO 3  may be coupled to the base  110  between the second-first base protrusion  112   a  and the second-second base protrusion  112   b  provided on the second sidewall  112  of the base  110 . 
     The first flexible region FO 1  may also be referred to as a first bending region. The first flexible region FO 1  may connect the first rigid region RO 1  disposed on an outer side of the base lower surface  115  of the base  110  and the second rigid region RO 2  disposed on an outer side of the first sidewall  111  of the base  110 , by bending at one point. Accordingly, a part of the first flexible region FO 1  may be disposed on the outer side of the base lower surface  115  of the base  110  based on a bending point, and the remaining part of the first flexible region FO 1  may be disposed on the outer side of the first sidewall  111  of the base  110 . That is, a part of the first flexible region FO 1  may be coupled to the second lower groove  115   d  provided on the base lower surface  115 , and the remaining part may be coupled to the first recess  111   d  provided on the first sidewall  111 . 
     The second flexible region FO 2  may also be referred to as a second bending region. The second flexible region FO 2  may connect the first rigid region RO 1  disposed on the outer side of the base lower surface  115  of the base  110  and the third rigid region RO 3  disposed on an outer side of the second sidewall  112  of the base  110 , by bending at one point. Accordingly, a part of the second flexible region FO 2  may be disposed on the outer side of the base lower surface  115  of the base  110  based on a bending point, and the remaining part of the second flexible region FO 2  may be disposed on the outer side of the second sidewall  112  of the base  110 . That is, a part of the second flexible region FO 2  may be coupled to the third lower groove  115   e  provided on the base lower surface  115 , and the remaining part may be coupled to a recess (not shown) provided on the second sidewall  112 . 
     Referring to  FIG. 12 b   , the first substrate  161  has a bent shape based on the first flexible region FO 1  and the second flexible region FO 2  as shown in  FIG. 12 a    in a first state (e.g., a state coupled to the base), but first flexible region FO 1  and the second flexible region FO 2  of the first substrate  161  have a flat shape as shown in  FIG. 12 b    in a second state (e.g., a state before being coupled to the base). 
     In addition, the first resonator  161   a  and the second resonator  161   b  are disposed on the first rigid region RO 1  of the first substrate  161  to be spaced apart from each other by a predetermined distance. 
     In this case, the first resonator  161   a  may include a first resonance coil  161   a   1 . In addition, although not shown in the figure, the first resonator  161   a  may include a first resonance capacitor  161   a   2  connected with the first resonance coil  161   a   1  in series. The first resonator  161   a  may generate a magnetic field by resonating with a resonance frequency f. The first resonator  161   a  may be a first position sensor for detecting the position of the first lens assembly  120  based on an inductance value that changes according to a change in the strength of the generated magnetic field. 
     The second resonator  161   b  may include a second resonance coil  161   b   1 . In addition, although not shown in the figure, the second resonator  161   b  may include a second resonance capacitor (not shown) connected with the second resonance coil  161   b   1  in series. The second resonator  161   b  may generate a magnetic field by resonating with a resonance frequency f. The second resonator  161   b  may be a second position sensor for detecting the position of the second lens assembly  130  based on an inductance value that changes according to a change in the strength of the generated magnetic field. 
     Also, the first substrate  161  may further include a third flexible region FO 3  extending from the first rigid region R 01 . The third flexible region FO 3  may have a flat surface, and may be bent to have a curved surface in some cases. A terminal (not shown) connected to the second substrate  162  or a terminal (not shown) connected to a main board (not shown) other than the second substrate  162  may be disposed in the third flexible region FO 3  of the first substrate  161 . 
     Also, a circuit pattern  161   c  connected to the first resonator  161   a , the second resonator  161   b , the third driving portion  171 , and the fourth driving portion  172  may be disposed on the first substrate  161 . For example, the circuit pattern  151   c  may be disposed on the first rigid region RO 1 , the second rigid region RO 2 , the third rigid region RO 3 , the first flexible region FO 1 , the second flexible region FO 2  and the third flexible region FO 3  of the first substrate to transmit an electric signa. For example, the circuit pattern  161   c  may be included a first circuit pattern  161   c   1  connected to the third driving portion  171  and a second circuit pattern  161   c   2  connected to the fourth driving portion  172 . 
     A third driving portion  171  may be disposed on the second rigid region RO 2 . Specifically, the first coil portion  171   b  constituting the third driving portion  171  may be disposed on the second rigid region RO 2 . 
     In addition, the fourth driving portion  172  may be disposed on the third rigid region RO 3 . Specifically, the second coil portion  172   b  constituting the fourth driving portion  172  may be disposed on the third rigid region RO 3 . 
     Meanwhile, a width of the first rigid region RO 1  in the z-axis direction, a width of the second rigid region RO 2  in the z-axis direction, and a width of the third rigid region RO 3  in the z-axis direction may be the same, but is not limited thereto. 
     However, the width in the z-axis direction of the first flexible region FO 1  of the first substrate  161  and the width in the z-axis direction of the second flexible region FO 2  may be narrower than the width of the rigid regions RO 1 , RO 2 , and RO 3 . In an embodiment, bending of the first substrate  161  may be facilitated by adjusting the widths of the first flexible region FO 1  and the second flexible region FO 2 . 
     Referring to  FIG. 12 c   , the first resonator  161   a  may include a first resonance coil  161   a   1  and a first resonance capacitor  161   a   2 . In this case, the first resonance coil  161   a   1  and the first resonance capacitor  161   a   2  may be connected in series with each other. Also, although not shown in the drawing, an oscillator (not shown) may be disposed on the first substrate  161 . The oscillator may generate an alternating signal. That is, the oscillator may generate an AC signal having a predetermined resonance frequency, and the generated AC signal may be applied to the first resonator  161   a  and the second resonator  161   b.    
     In addition, the first resonator  161   a  may perform a resonance operation by receiving the AC signal generated from the oscillator. That is, the first resonator  161   a  may generate a magnetic field in a peripheral region by the applied AC signal. 
     The first resonance coil  161   a   1  and the first resonance capacitor  161   a   2  may be referred to as an LC resonance circuit, and may oscillate by forming a so-called tank circuit. 
       FIG. 13  is a view for explaining an operation principle of the first and second resonators according to the embodiment. 
     Referring to  FIG. 13 , when an AC signal corresponding to a resonance frequency is applied to the first resonator  161   a  or the second resonator  161   b  by an oscillator, a first magnetic field is generated around the resonance coils  161   a   1  and  161   b   1  constituting the first resonator  161   a  and the second resonator  161   b.    
     In this case, the first and second conductors may be selectively present in a region around the first magnetic field generated by the resonance coils  161   a   1  and  161   b   1 . The first conductor  123  is attached to the lower surface of the first lens assembly  120 , and the second conductor is attached to the lower surface of the second lens assembly  130 . 
     Here, the positions of the first conductor  123  and the second conductor change as the first lens assembly  120  and the second lens assembly  130  move. 
     In this case, the first conductor  123  is positioned in the upper region of the first resonance coil  161   a   1 , and the position moves within the upper region of the first resonance coil  161   a   1  according to the movement of the first lens assembly  120 . 
     In addition, the second conductor is positioned in the upper region of the second resonance coil  161   b   1 , and the position moves within the upper region of the second resonance coil  161   b   1  according to the movement of the second lens assembly  130 . 
     In this case, the upper region of the first resonance coil  161   a   1  and the upper region of the second resonance coil  161   b   1  do not overlap each other. That is, the first conductor moves only in the upper region of the first resonance coil  161   a   1  and does not move in the upper region of the second resonance coil  161   b   1 . In other words, the first lens assembly  120  has a first stroke. In this case, the first lens assembly  120  may be a zoom lens assembly. Accordingly, the first lens assembly  120  has a first stroke between a tele position and a wide position. In addition, the first conductor  123  within the first stroke between the tele position and the wide position where the first lens assembly  120  can move is positioned only in the upper region of the first resonance coil  161   a   1  and, not positioned in the upper region of the second conductor. 
     In the embodiment, the first conductor  123  is positioned only in the upper region of the first resonance coil  161   a   1  within the first stroke of the first lens assembly  120 , the inductance changed by the first conductor  123  can be accurately measured in the first resonator  161   a , and it is possible to prevent the inductance of the second resonator  161   b  from being changed by the first conductor  123 . 
     In addition, the second conductor moves only in the upper region of the second resonance coil  161   b   1  and does not move in the upper region of the first resonance coil  161   a   1 . In other words, the second lens assembly  130  has a second stroke. In this case, the second lens assembly  130  may be a focus lens assembly. Accordingly, the second lens assembly  130  has a second stroke between the first focus position (the position closest to the image sensor within the range where the second lens assembly can move) and the second focus position (the position furthest from the image sensor within the range that the second lens assembly can move). In addition, the second conductor within the second stroke between the first focus position and the second focus position where the second lens assembly  130  can move is positioned only in the upper region of the second resonance coil  161   b   1  and, not positioned in the upper region of the first conductor. 
     In the embodiment, the second conductor is positioned only in the upper region of the second resonance coil  161   b   1  within the second stroke of the second lens assembly  130 , the inductance changed by the second conductor can be accurately measured in the second resonator  161   b , and it is possible to prevent the inductance of the first resonator  161   a  from being changed by the first conductor  123 . 
     On the other hand, when the first conductor  123  is positioned in the upper region of the first resonance coil  161   a   1  in the state in which the first magnetic field corresponding to the AC signal based on the resonance frequency f is being generated in the first resonance coil  161   a   1  as described above, an eddy current is induced on the surface of the first conductor  123  by the first magnetic field. 
     In addition, the first conductor  123  generates a second magnetic field by the induced eddy current. At this time, the second magnetic field is generated in the opposite direction to the first magnetic field, and thus interferes with the first magnetic field generated by the first resonance coil  161   a   1 . That is, the second magnetic field generated by the first conductor  123  acts as an interfering magnetic field that interferes with the first magnetic field. In addition, the second magnetic field reduces the strength of the first magnetic field, and thus reduces the inductance of the first resonator  161   a . Here, the decrease in the strength of the first magnetic field may mean that a voltage applied to the first resonance coil  161   a   1  decreases, and also may mean that a current flowing in the first resonance coil  161   a   1  decreases. 
     In this case, a reduction width of the inductance increases in proportion to the strength of the second magnetic field. That is, as the distance between the first conductor  123  and the first resonance coil  161   a   1  increases, the reduction width of the inductance increases. Also, as the overlapping region of the first conductor  123  and the first resonance coil  161   a   1  in the y-axis direction increases, the reduction width of the inductance increases. 
     In addition, the inductance digital converter LDC may be connected to the first resonator  161   a , and accordingly obtain a digital value corresponding to a change in the inductance value of the first resonator  161   a.    
     At this time, the digital value output from the inductance digital converter (LDC) indicates how much the current position is moved based on the initial position of the first lens assembly  120  or the second lens assembly  130 , and the current position of the first lens assembly  120  or the second lens assembly  130  may be detected based on the digital value. 
       FIG. 14  is a cross-sectional view taken along line A-A′ in the camera module of  FIG. 1 . 
     Referring to  FIG. 14 , the first guide portion  151 , the second guide portion  152 , the first lens assembly  120 , and the second lens assembly  130  are disposed in the base  110 . 
     In addition, a first conductor  123  is disposed on a lower surface of the first lens assembly  120 , and a second conductor is disposed on a lower surface of the second lens assembly  130 . 
     Also, on the upper surface of the first substrate  161 , the first resonator  161   a  is disposed in a lower region corresponding to the first stroke of the first lens assembly  120 , and the second resonator  161   b  is disposed in the lower region corresponding to the second stroke of the second lens assembly  130 . 
     In addition, a linear distance in the y-axis direction at which the first resonator  161   a  and the first conductor  123  are disposed, that is, a region between the first resonator  161   a  and the lower surface of the first lens assembly  120  on which the first conductor  123  is disposed includes a gap corresponding to a first distance G. In this case, an inductance change width of the first resonator  161   a  varies according to the first distance G. Here, the inductance change width may mean an inductance change amount of the first resonator  161   a  when the first conductor  123  moves from the first position to the second position. At this time, it was confirmed that as the first distance G decreased, the amount of change in inductance increased, and thus the position detection accuracy was improved. And, as the first distance G increases, the amount of change in inductance decreases, and thus it can be confirmed that accurate position detection is difficult. 
     The amount of change in inductance of the first resonator  161   a  according to the first distance G is shown in Table 1 below. 
     
       
         
           
               
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                   
                 First distance 
               
               
                   
                 (G)(mm) 
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 0.1 
                 0.2 
                 0.3 
                 0.4 
                 0.5 
                 0.6 
               
               
                   
               
               
                 amount of 
                 1.611 
                 1.534 
                 1.437 
                 1.324 
                 1.246 
                 1.164 
               
               
                 change (uH) 
               
               
                   
               
            
           
         
       
     
     As described above, it was confirmed that the magnetic flux with respect to the second magnetic field generated in the first conductor  123  increases as the first distance G decreases, and accordingly, it was confirmed that the amount of change in inductance of the first resonator  161   a  can be increased. 
     However, if the first distance G becomes too small, the movement of the first lens assembly  120  may be affected, and the inductance of the first resonator  161   a  may be changed by being influenced by the second conductor other than the first conductor  123 . Therefore, the first distance G in the embodiment is to have a range of 0.1 mm to 0.2 mm. In this case, when the first distance G is less than 0.1 mm, the first resonator  161   a  may affect the movement characteristics of the first lens assembly  120 . In addition, when the first distance G is smaller than 0.1 mm, the inductance of the first resonator  161   a  is changed by being influenced by the second conductor attached to the second lens assembly  130  other than the first conductor  123 , accordingly, it may be difficult to accurately detect the position of the first lens assembly  120 . In addition, when the first distance G is greater than 0.2 mm, the amount of change in inductance of the first resonator according to a change in the position of the first lens assembly is small, and accordingly, it may be difficult to accurately detect the position of the first lens assembly. 
     Also, the second resonator  161   b  may be designed to correspond to the design condition of the first resonator  161   a.    
     Meanwhile, inductive sensing is basically measured by changes in inductance of the resonator and resonance impedance (Rp). In this case, the two parameters are affected by the design, components, and driving conditions of the resonance coil. In this case, Rp is affected by the thermal constant of a coil and a conductor, and the inductance of the resonator is affected by the coefficient of thermal expansion (CTE) of the coil structure (e.g., the substrate). And, since this effect has a very small effect on the inductance change of the entire resonance coil, the inductance change of the resonator is not affected by the thermal change compared to the Hall sensor. 
       FIG. 15  is a view showing a change in characteristics of a resonator according to a resonance frequency according to an embodiment. 
     Meanwhile, the first resonator  161   a  or the second resonator  161   b  constitutes a resonance circuit and performs an oscillation operation corresponding to the resonance frequency f. At this time, the resonance frequency f is 
     
       
         
           
             
               f 
               [ 
               Hz 
               ] 
             
             - 
             
               
                 1 
                 
                   2 
                   ⁢ 
                   π 
                   ⁢ 
                   
                     LC 
                   
                 
               
               . 
             
           
         
       
     
     Here, L is the inductance of the resonance coil constituting the first resonator  161   a  or the second resonator  161   b , and C is the capacitance of the resonance capacitor constituting the first resonator  161   a  or the second resonator  161   b . And, as shown in  FIG. 15 , the inductance of the resonance coil and the capacitance of the resonance capacitor change according to the resonance frequency. 
       FIG. 16  is a view for explaining a position sensing operation of the lens assembly according to the embodiment. 
     Referring to  FIG. 16 , a first resonance coil  161   a   1  and a second resonator  161   b  may be disposed on the first substrate  161  to be spaced apart from each other by a predetermined interval. The upper region of the substrate  161  may be divided into a first region R 1  and a second region R 2 . In this case, the first region R 1  is a position sensing region provided by the first resonance coil  161   a   1 , and the second region R 2  is a position sensing region provided by the second resonance coil  161   b   1 . 
     In other words, when a metal material is present on the first region R 1 , the inductance of the first resonator  161   a  may be changed by the metal material. Also, when a metal material is present on the second region R 2 , the inductance of the second resonator  161   b  may be changed by the metal material present on the second region R 2 . 
     In this case, the first conductor  123  attached to the lower surface of the first lens assembly  120  may move only within a range between the first position P 1  and the third position P 3  corresponding to the first stroke S 1  having the first lens assembly  120 . In this case, the movable region of the first conductor  123  does not overlap the second region R 2 . Accordingly, the inductance of the second resonator  161   b  does not change due to the first conductor  123 . 
     The second conductor  133  attached to the lower surface of the second lens assembly  130  may move only within a range between the first position P 1 ′ and the third position P 3 ′ corresponding to the second stroke S 2  having the second lens assembly  130 . In this case, the movable region of the second conductor  133  does not overlap the first region R 1 . Accordingly, the inductance of the first resonator  161   a  does not change due to the second conductor  133 . 
     On the other hand, as the distance between the first resonator  161   a  and the first conductor  123  increases, furthermore, as the overlapping region between the first conductor  123  and the first resonance coil  161   a   1  increases in the y-axis direction, the inductance of the first resonator  161   a  is reduced under the influence of the interfering magnetic field generated in the first conductor  123 . 
     In addition, as the distance between the second resonator  161   b  and the second conductor  133  increases, furthermore, as the overlapping region between the second conductor  133  and the second resonance coil  161   b   1  increases in the y-axis direction, the inductance of the second resonator  161   b  is reduced under the influence of the interfering magnetic field generated in the second conductor  133 . 
     Referring to  FIG. 16( a ) , when the first lens assembly  120  is in the tele position, and thus the first conductor  123  is present in the first position P 1 , the first resonator  161   a  may have a first-first inductance. In this case, the first-first inductance may have a value similar to that of the first reference inductance. Here, the first reference inductance may mean an inductance of the first resonator  161   a  in a state in which an interfering magnetic field does not exist. However, even when the first conductor  123  is present at the first position P 1 , the inductance of the first resonator  161   a  may be reduced by the interfering magnetic field generated in the first conductor  123 , and, accordingly, the first-first inductance may be smaller than the first reference inductance. 
     In addition, when the second lens assembly  130  is in the first focus position, and thus the second conductor  133  is present in the first position P 1 ′, the second resonator  161   b  may have second-first inductance. In this case, the second-first inductance may have a value similar to that of the second reference inductance. Here, the second reference inductance may mean an inductance of the second resonator  161   b  in a state in which an interfering magnetic field does not exist. However, even when the second conductor  123  is present at the first position P 1 ′, the inductance of the second resonator  161   b  may be reduced by the interfering magnetic field generated in the second conductor  133 , and, accordingly, the second-first inductance may be smaller than the second reference inductance. 
     Referring to  FIG. 16( b ) , when the first lens assembly  120  is in a position between the tele position and the wide position, and thus the first conductor  123  is present in the second position P 2 , the first resonator  161   a  may have a first-second inductance. In this case, the first-second inductance may have a value similar to that of the first reference inductance and the first-first inductance. That is, as the position of the first lens assembly  120  moves, the position of the first conductor  123  also moves. In addition, when the first conductor  123  is in the second position P 2  than when it is in the first position P 1 , the intensity of the interfering magnetic field is greater, and accordingly, the inductance of the first resonator  161   a  may have the first-second inductance that is decreased by a predetermined value from the first-first inductance. 
     In addition, when the second lens assembly  130  is in a second focus position, and thus the second conductor  133  is present in the second position P 2 ′ between the first position P 1 ′ and the second position P 3 ′, the second resonator  161   b  may have a second-second inductance. In this case, the second-second inductance may have a value similar to that of the second reference inductance and the second-first inductance. That is, as the position of the second lens assembly  130  moves, the position of the second conductor  133  also moves. In addition, when the second conductor  133  is in the second position P 2 ′ than when it is in the first position P 1 ′, the intensity of the interfering magnetic field is greater, and accordingly, the inductance of the second resonator  161   b  may have the second-second inductance that is decreased by a predetermined value from the second-first inductance. 
     Referring to  FIG. 16( c ) , when the first lens assembly  120  is moved to the wide position, which is a maximum movable position, and thus the first conductor  123  is present in the third position P 3 , the first resonator  161   a  may have a first-third inductance. In this case, the first-third inductance may have a value similar to that of the first reference inductance, the first-first inductance and the first-second inductance. That is, as the position of the first lens assembly  120  moves, the position of the first conductor  123  also moves. In addition, when the first conductor  123  is in the third position P 3  than when it is in the first position P 1  or the second position P 2 , the intensity of the interfering magnetic field is greater, and accordingly, the inductance of the first resonator  161   a  may have the first-third inductance that is decreased by a predetermined value from the first-second inductance. 
     In addition, when the second lens assembly  120  is moved to the third focus position, which is a maximum movable position, and thus the second conductor  133  is present in the third position P 3 ′, the second resonator  161   b  may have a second-third inductance. In this case, the second-third inductance may have a value similar to that of the second reference inductance, the second-first inductance and the second-second inductance. That is, as the position of the second lens assembly  130  moves, the position of the second conductor  133  also moves. In addition, when the second conductor  133  is in the third position P 3 ′ than when it is in the first position P 1 ′ or the second position P 2 ′, the intensity of the interfering magnetic field is greater, and accordingly, the inductance of the second resonator  161   b  may have the second-third inductance that is decreased by a predetermined value from the second-second inductance. 
     As described above, when the first lens assembly  120  moves, the first conductor  123  attached to the first lens assembly  120  causes an inductance change of the first resonator  161   a . At this time, the inductance is changed in proportion to the amount of movement of the first lens assembly  120 , accordingly, the position of the first conductor  123  and the position of the first lens assembly  120  corresponding thereto can be detected by sensing the inductance of the first resonator  161   a.    
     As described above, when the second lens assembly  130  moves, the second conductor  133  attached to the second lens assembly  130  causes an inductance change of the second resonator  161   b . At this time, the inductance is changed in proportion to the amount of movement of the second lens assembly  130 , accordingly, the position of the second conductor  133  and the position of the second lens assembly  130  corresponding thereto can be detected by sensing the inductance of the second resonator  161   b.    
       FIG. 17  is a graph showing a positional relationship of a lens assembly corresponding to an output value of an inductance digital converter (LDC) according to an embodiment. 
     An inductance digital converter LDC detects the inductance of the first resonator  161   a , converts and outputs it into a first digital value. In this case, the inductance digital converter LDC may detect the resonance impedance Rp. In this case, the resonance impedance Rp may be calculated as follows. 
         Rp=L /( Rs*c ) 
     Here, Rp is the resonance impedance, L is the inductance, Rs is the series resistance value of the resonator, and C is the capacitance of the resonator. 
     The inductance digital converter LDC detects the inductance of the first resonator  161   a , converts and outputs it into a first digital value. In this case, the inductance of the first resonator  161   a  is linearly changed according to the movement of the first lens assembly  120  within the first stroke of the first lens assembly  120 . And, as shown in  FIG. 17 , a position of the first lens assembly  120  may be detected based on the first digital value (LDC output (Rp)). 
     The inductance digital converter LDC detects the inductance of the second resonator  161   b , converts and outputs it into a second digital value. At this time, the inductance of the second resonator  161   b  is linearly changed according to the movement of the second lens assembly  130  within the second stroke of the second lens assembly  130 . And, as shown in  FIG. 17 , a position of the second lens assembly  130  may be detected based on the second digital value (LDC output (Rp)). 
       FIG. 18 a    is a view showing various embodiments of a shape of a conductor in a camera module according to an embodiment. 
     Referring to  FIG. 18 a   , the conductors  123  and  133  may have a shape in which the width gradually changes in the direction of the optical axis. For example, as shown in  FIG. 7 , the conductors  123  and  133  may have a triangular shape in a plane shape and a straight line at each side thereof. 
     Alternatively, referring to  FIG. 18 a    (a), the conductors  123  and  133  may have a triangular shape in a plane shape and a curve at each side thereof. 
     Also, alternatively, referring to  FIG. 18 a    (b), the conductors  123  and  133  may have a rhombus shape in a plane shape and a straight line at each side thereof. 
     Also, alternatively, referring to  FIG. 18 a    (c), the conductors  123  and  133  may have a rhombic shape in a plane shape and a curve at each side thereof. 
     However, the conductors  123  and  133  in the embodiment are not limited to the above-described shapes, and any shape in which the width linearly increases or decreases in the optical axis direction may be used as the shape of the conductors  123  and  133 . 
     Meanwhile, when the conductors  123  and  133  have a rectangular shape with no change in width in the optical axis direction, it may be difficult to accurately detect the position of the lens assembly. 
       FIG. 18 b    is a view for explaining a problem in the case where the conductor has a rectangular shape. 
     Referring to  FIG. 18 b   , when the conductor  20  has a rectangular shape, there is a problem in that position sensing is impossible or accurate position sensing is difficult depending on the position of the lens assembly. 
     That is, referring to  FIG. 18 b    (a), when the conductor  20  is in the first position, an area of the overlapping region the y-axis direction between the conductor  20  and the resonance coil  10  may be ‘A’. 
     At this time, referring to  FIG. 18 b    (b), even when the conductor  123  moves from the first position to the second position, an area of the overlapping region between the conductor  20  and the resonance coil  10  in the y-axis direction may be ‘A’. In other words, when the conductor  20  has a rectangular shape with no change in width in the optical axis direction, the inductance of the resonator may be the same even when the positions of the conductors  20  are different from each other. In this case, since there are two conditions corresponding to one result value, it is impossible to detect at which position the lens assembly is positioned among the two, thereby reducing the reliability of the camera module. 
     On the other hand, in the embodiment, the first conductor  123  and the second conductor  133  have a shape in which the width changes in the direction of the optical axis. Preferably, the first conductor  123  and the second conductor  133  may have a triangular planar shape. Accordingly, in the embodiment, only one condition corresponding to one result value exists, and accordingly, the position of the lens assembly may be accurately recognized using the digital value output from the inductance digital converter LDC. 
     &lt;Resonator&gt; 
     Hereinafter, the resonator according to the embodiment will be described in detail. 
       FIG. 19 a    is a cross-sectional view schematically showing a resonator according to an embodiment, and  FIG. 19 b    is a plan view of the resonator shown in  FIG. 19   a.    
     Referring briefly to  FIGS. 12 a  and 12 b   , the first substrate  161  includes a first resonator  161   a  and a second resonator  161   b . And, in this case, the first resonator  161   a  may include a first resonance coil  161   a   1 . In addition, although not shown in the drawing, the first resonator  161   a  may include a first resonance capacitor  161   a   2  connected with the first resonance coil  161   a   1  in series. The first resonator  161   a  may generate a magnetic field by resonating with a resonance frequency f. The first resonator  161   a  may be a first position sensor for detecting the position of the first lens assembly  120  based on an inductance value that changes according to a change in the strength of the generated magnetic field. 
     That is, the first resonance capacitor  161   a   2  forms a first LC resonance circuit together with the first resonance coil  161   a   1 . Preferably, the first resonance capacitor  161   a   2  and the first resonance coil  161   a   1  may be a first parallel LC resonance circuit connected in parallel with each other. The first parallel LC resonance circuit may vibrate at a resonance frequency f to generate a magnetic field having a magnitude corresponding to the resonance frequency f. 
     The second resonator  161   b  may include a second resonance coil  161   b   1 . In addition, although not shown in the drawing, the second resonator  161   b  may include a second resonance capacitor (not shown) connected with the second resonance coil  161   b   1  in series. The second resonator  161   b  may generate a magnetic field by resonating with the resonance frequency f. The second resonator  161   b  may be a second position sensor for detecting the position of the second lens assembly  130  based on an inductance value that changes according to a change in the strength of the generated magnetic field. 
     That is, the second resonance capacitor forms a second LC resonance circuit together with the second resonance coil  161   b   1 . Preferably, the second resonance capacitor and the second resonance coil  161   b   1  may be a second parallel LC resonance circuit connected in parallel with each other. The second parallel LC resonance circuit may vibrate at the resonance frequency f to generate a magnetic field having a magnitude corresponding to the resonance frequency f. 
     Referring back to  FIG. 19 a   , the first substrate  161  includes an insulating layer  161   d  and resonance coils  161   a   1  and  161   b   1  disposed on the insulating layer  161   d . In this case, a resonance capacitor (not shown) disposed adjacent to the resonance coils  161   a   1  and  161   b   1  may be included on the insulating layer  161   d . That is, each of the resonance coils  161   a   1  and  161   b   1  include one end and the other end. In addition, one end of the resonance capacitor may be connected to one end of the resonance coils  161   a   1  and  161   b   1 , and the other end of the resonance capacitor may be connected to the other end of the resonance coils  161   a   1  and  161   b   1 . Also, both ends of the resonance capacitor may be connected to an input terminal (not shown) of the inductance digital converter LDC. 
     Meanwhile, the insulating layer  161   d  may have a plurality of layer structures. In this case, the insulating layer  161   d  may include an insulating layer material having a flexible characteristic and an insulating layer material having a rigid characteristic such that a portion of the region has a flexible characteristic and the remaining partial region has a rigid characteristic. In addition, the insulating layer  161   d  disposed on the rigid region may include both the insulating layer material having a rigid characteristic and a flexible characteristic. In addition, an insulating layer material having a flexible characteristic may be only disposed in the insulating layer  161   d  disposed on the flexible region. 
     Resonance coils  161   a   1  and  161   b   1  may be disposed on the insulating layer  161   d . In this case, the resonance coils  161   a   1  and  161   b   1  may be disposed to be spaced apart from each other by a predetermined interval on the insulating layer  161   d.    
     Meanwhile, as shown in  FIG. 19 a    (a), the resonance coils  161   a   1  and  161   b   1  may have a structure in which they protrude from the insulating layer  161   d . Also, as shown in  FIG. 19 a    (b), a groove  161   dg  corresponding to a coil shape may be formed on a surface of the insulating layer  161   d , and accordingly, the resonance coils  161   a   1  and  161   b   1  may have a structure buried in the groove  161   dg.    
     Such resonance coils  161   a   1  and  161   b   1  may be formed by performing an etching process, and may be formed by performing a plating process differently from this. 
     When the resonance coils  161   a   1  and  161   b   1  are formed through an etching process, a metal layer (not shown) may be disposed on the insulating layer  161   d , and the metal layer may be etched to correspond to the coil shape to form the resonance coils  161   a   1 ,  161   b   1 . 
     In addition, when the resonance coils  161   a   1  and  161   b   1  are formed through the plating process, a mask (not shown) having an opening corresponding to the coil shape may be formed on the insulating layer  161   d , and accordingly, the resonance coils  161   a   1  and  161   b   1  may be formed by performing plating (electroless plating or electrolytic plating) to fill the opening of the mask. 
     Referring to  FIG. 19B , the resonance coils  161   a   1  and  161   b   1  may be disposed on the insulating layer  161   d  by turning the plurality of times. That is, the resonance coils  161   a   1  and  161   b   1  may be wound on the insulating layer  161   d  with a predetermined number of turns. The resonance coils  161   a   1  and  161   b   1  may be disposed as a single layer on the insulating layer  161   d . An outer surface of the resonance coils  161   a   1  and  161   b   1  may be coated with an insulating material or covered with an insulating layer, but are not limited thereto. The resonance coils  161   a   1  and  161   b   1  may be disposed on the insulating layer  161   d  with the number of turns in the range of 7 to 11 turns. Preferably, the resonance coils  161   a   1  and  161   b   1  may be disposed on the insulating layer  161   d  with the number of turns in the range of 8 to 10 turns. More preferably, the resonance coils  161   a   1  and  161   b   1  may be disposed on the insulating layer  161   d  by turning 9 times. The number of turns of the resonance coils  161   a   1  and  161   b   1  is related to the total inductance of the resonance part. As the number of turns of the resonance coils  161   a   1  and  161   b   1  increases, the total inductance of the resonator also increases, and the range of change in inductance also increases. In addition, when the change range of the inductance increases, the position of the lens assembly may be more accurately detected. However, as the number of turns of the resonance coils  161   a   1  and  161   b   1  increases, there is a problem in that the size of the camera module increases or the product price increases. Accordingly, in the embodiment, the resonance coils  161   a   1  and  161   b   1  are turned 9 times to be disposed on the insulating layer  161   d.    
     Meanwhile, the resonance coils  161   a   1  and  161   b   1  have a predetermined thickness and are disposed on the insulating layer  161   d . At this time, as the thickness of the resonance coils  161   a   1  and  161   b   1  increases, the total inductance of the resonator also increases. The thicker the thickness of the resonance coils  161   a   1  and  161   b   1  is, the better. However, when the thickness of the resonance coils  161   a   1  and  161   b   1  is thin, the total inductance becomes small, the number of turns of the resonance coils  161   a   1  and  161   b   1  must be increased to compensate for this, however, it is constrained by limited PCB space. In addition, when the thickness of the resonance coils  161   a   1  and  161   b   1  is thin, the resistance increases and signal loss occurs in the process of transmitting high-frequency signals (MHz or higher), and it may be more affected by the parasitic capacitor generated between the inductance. Therefore, in the embodiment, the thickness of the resonance coils  161   a   1  and  161   b   1  is set to have a minimum thickness of 50 μm or more. In addition, in the embodiment, the thickness (H, see  FIG. 19A ) of the resonance coils  161   a   1  and  161   b   1  is 1 mm or less. For example, the thickness H of the resonance coils  161   a   1  and  161   b   1  may range from 50 um to 1 mm. When the thickness H of the resonance coils  161   a   1  and  161   b   1  exceeds 1 mm, the thickness of the insulating layer must also increase as much as the thickness of the resonance coils  161   a   1  and  161   b   1 , accordingly, there is a problem in that the overall size of the resonator increases. 
     Also, the resonance coils  161   a   1  and  161   b   1  may be disposed on the insulating layer  161   d  to have a predetermined width W, have the above-described number of turns, and be spaced apart from each other by a predetermined interval S. In this case, the width W of the resonance coils  161   a   1  and  161   b   1  may range from 50 um to 1 mm. That is, when the width of the resonance coils  161   a   1  and  161   b   1  is smaller than 50 um, the total inductance decreases, the number of turns of the resonance coils  161   a   1  and  161   b   1  must be increased to compensate for this, and this is limited by the limited PCB space. In addition, when the width of the resonance coils  161   a   1  and  161   b   1  is smaller than 50 um, the resistance increases and signal loss occurs in the process of transmitting a signal of a high-frequency signal (MHz or higher), and it may be more affected by the parasitic capacitor generated between the inductance. 
     Also, for the same reason as described above, the spacing S of the resonance coils  161   a   1  and  161   b   1  may be in a range of 50 μm to 300 μm. When the spacing S of the resonance coils  161   a   1  and  161   b   1  is less than 50 μm, accurate inductance sensing may not be possible due to mutual interference between neighboring coils. Also, when the spacing S between the resonance coils  161   a   1  and  161   b   1  is greater than 300 μm, the PCB space occupied by the resonance coils increases under the condition that the resonance coils have the same total inductance. 
     Meanwhile, the resonance coils  161   a   1  and  161   b   1  may be disposed on the insulating layer  161   d  to surround the first region and have the above-described number of turns. In this case, the width of the first region may correspond to an inner width Din of the resonance coils  161   a   1  and  161   b   1 . The inner width Din may mean a width of a portion having the smallest distance of a straight line crossing the centers of the resonance coils  161   a   1  and  161   b   1  on the inner surfaces of the resonance coils  161   a   1  and  161   b   1 . Also, the resonance coils  161   a   1  and  161   b   1  may have a predetermined outer width Dout. The outer width Dout may mean a width of a portion on the outer surface of the resonance coils  161   a   1  and  161   b   1  in which the distance of a straight line crossing the centers of the resonance coils  161   a   1  and  161   b   1  is greatest. In this case, in the embodiment, the outer width Dout is at least three times greater than the inner width Din. When the outer width Dout is less than three times the inner width Din, the change width decreases as the total inductance decreases, and accordingly, it may be difficult to accurately detect the position of the lens assembly. 
       FIG. 20 a    is a cross-sectional view schematically showing a resonator according to another exemplary embodiment,  FIG. 20 b    is a view specifically showing a resonance coil in the resonator shown in  FIG. 20 a   , and  FIG. 20 c    is an equivalent circuit diagram of the resonator shown in  FIGS. 20 a    and  20   b.    
     Referring to  FIG. 20 a   , the camera module includes a resonator  400 . In this case, the resonator  400  may be any one of the previously described first resonator  161   a  and the second resonator  161   b . Hereinafter, for convenience of description of the first resonator  161   a  and the second resonator  161   b , one of them will be referred to as the resonator  400 . However, it should be borne in mind that the resonator  400  below may replace the first resonator  161   a  and the second resonator  161   b.    
     The resonator  400  may have a plurality of layer structures. More preferably, as described above, the resonator  400  may include an insulating layer  410 , a resonance coil  420  and a resonance capacitor  430  disposed on the insulating layer  410 . In addition, the insulating layer  410  may have a plurality of stacked structures. 
     The insulating layer  410  may include a first insulating layer  411 , a second insulating layer  412 , a third insulating layer  413 , and a fourth insulating layer  414 . That is, the insulating layer  410  may have a four-layer structure, but is not limited thereto. 
     In addition, the resonance coil  420  includes a first coil portion  421  disposed on the first insulating layer  411 , a second coil portion  422  disposed on the second insulating layer  412 , a third coil portion  423  disposed on the third insulating layer  413 , and a fourth coil portion  424  disposed on the fourth insulating layer  414 . 
     That is, in the embodiment, the resonance coil  420  has a plurality of layer structures and is disposed on the plurality of insulating layers. Accordingly, in the embodiment, the length of the resonance coil  420  may be increased, and correspondingly, the total inductance of the resonator may be increased to increase the change width. 
     At this time, each of the first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion  424  is disposed to have a circular spiral structure as shown in  FIG. 19   b.    
     The first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion  424  may be connected to each other in series through the vias V 1 , V 2 , V 3 , and V 4 . Accordingly, in the embodiment, it is possible to provide a resonator having a high inductance within a minimum PCB area. 
     To this end, a first via V 1  is formed in the second insulating layer  412 . The first via V 1  may have one end connected to the first coil portion  421  and the other end connected to the second coil portion  422 . In addition, the first coil portion  421  may be connected in series with the second coil portion  422  through the first via V 1 . 
     A second via V 2  is formed in the third insulating layer  413 . The second via V 2  may have one end connected to the second coil portion  422  and the other end connected to the third coil portion  423 . In addition, the second coil portion  422  may be connected in series with the third coil portion  423  through the second via V 2 . 
     A third via V 3  is formed in the fourth insulating layer  414 . The third via V 3  may have one end connected to the third coil portion  423  and the other end connected to the fourth coil portion  424 . In addition, the third coil portion  423  may be connected in series with the fourth coil portion  424  through the third via V 3 . 
     At this time, the first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion may be formed by an additive process, a subtractive process, a modified semi additive process (MSAP) and a semi additive process (SAP) method, which is a typical printed circuit board manufacturing process, and a detailed description thereof will be omitted herein. 
     In addition, each of the first to third vias V 1 , V 2 , and V 3  is disposed to pass through any one of the second to fourth insulating layers  412 ,  413 , and  414 . Preferably, each of the first to third vias V 1 , V 2 , and V 3  may be formed by filling an inside of a via hole (not shown) passing through any one of the second to fourth insulating layers  412 ,  413 , and  414  with a conductive material or plating with a conductive material. 
     A metal material for forming the first to third vias V 1 , V 2 , V 3  may be any one material selected from Cu, Ag, Sn, Au, Ni, and Pd, and the metal material may be filled using any one of electroless plating, electrolytic plating, screen printing, sputtering, evaporation, ink jetting and dispensing or combination thereof. 
     In this case, the via hole may be formed by any one of processing methods, including mechanical, laser, and chemical processing. 
     When the via hole is formed by mechanical processing, methods such as milling, drilling, and routing may be used, and when the via hole is formed by laser processing, a UV or CO 2  laser method may be used, and when the via hole is formed by chemical processing, drugs containing aminosilane, ketones, etc. may be used, and the like, thereby the insulating layers may be opened. 
     Meanwhile, a pad portion  440  is disposed on the fourth insulating layer  414 , and a resonance capacitor  430  may be attached to the pad portion  440 . In this case, one end of the resonance capacitor  430  is connected to the fourth coil portion  424 , and the other end of the resonance capacitor  430  is connected to the first coil portion  421 . To this end, the resonator  400  may include a fourth via V 4  disposed to pass through the second insulating layer  412 , the third insulating layer  413 , and the fourth insulating layer  414  in common. The fourth via V 4  may have one end connected to the first coil portion  421  and the other end connected to the resonance capacitor  430 . 
     Referring to  FIG. 20 b   , currents may flow in the same direction as each other in the first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion  424 . To this end, the first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion  424  may be disposed on the insulating layer  410  by turning in different directions. 
     Preferably, the first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion  424  may include one end and the other end, respectively. 
     In this case, one end of each of the first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion  424  may be an end disposed on an inner side of the coil, and the other end may be an end disposed on an outer side the coil. 
     In addition, the turning direction of each of the first coil portion  421 , the second coil portion  422 , the third coil portion  423 , and the fourth coil portion  424  may mean a direction starting from the other end and turning to one end, differently, it may mean a direction starting from the other end and turning to one end. Hereinafter, the turning direction of each coil portion will be described as a rotational direction from the other end positioned on the inner side to one end positioned on the outer side. 
     For example, the first coil portion  421  may be disposed on the first insulating layer  411  by turning in a clockwise direction. In addition, the second coil portion  422  may be disposed on the second insulating layer  412  by turning in a counterclockwise direction opposite to the turning direction of the first coil portion  421 . Also, the third coil portion  423  may be disposed on the third insulating layer  413  by turning in a clockwise direction opposite to the turning direction of the second coil portion  422 . In addition, the fourth coil portion  424  may be disposed on the fourth insulating layer  414  by turning in a counterclockwise direction opposite to the turning direction of the third coil portion  423 . In other words, each coil portion may be disposed by turning in a direction opposite to the turning direction of the coil portion disposed in a neighboring layer. 
     Meanwhile, the resonance capacitor  430  of the resonator  400  has one end connected to the first coil portion  421  and the other end connected to the fourth coil portion  424 . In addition, one end of the resonance capacitor may be connected to the first output terminal T 1  connected to the inductance digital converter LDC, and the other end of the resonance capacitor may be connected to the second output terminal T 2  connected to the inductance digital converter LDC. 
     Referring to  FIG. 20 c   , the resonator  400  as described above includes a resonance coil  420  including a first coil portion  421 , a second coil portion  422 , a third coil portion  423 , and a fourth coil portion  424  connected in series with each other, and a resonance capacitor  430  may be connected to both ends thereof, and both ends of the resonance capacitor  430  may constitute a resonance circuit connected to the inductance digital converter (LDC). 
     As described above, in the embodiment, the resonance coil  420  is disposed on the plurality of insulating layers to have a plurality of layer structures, so that the total inductance of the resonator  400  can be maximally increased within a limited space. Meanwhile, the thickness of the resonator having the four-layer structure (more specifically, the thickness of the substrate in the first rigid region) may be in the range of 0.4 mm to 0.8 mm. Preferably, the thickness of the resonator having a four-layer structure may be in the range of 0.5 mm to 0.6 mm. 
     Hereinafter, a resonator according to another embodiment will be described. 
       FIG. 21  is a block diagram showing a resonator according to another exemplary embodiment. 
     The resonator described with reference to  FIGS. 19A to 20C  includes only an oscillation coil that generates a magnetic field by an AC signal having a predetermined resonance frequency generated by an oscillator (not shown). In addition, the inductance of the oscillation coil is changed by a conductor approaching the surroundings, and the position of the lens assembly is sensed by detecting the changed inductance by an inductance digital converter LDC. 
     On the other hand, referring to  FIG. 21 , the resonance coil of the resonator  500  according to another embodiment of the present invention includes an oscillation coil  520  and a receiving coil  530 . In addition, the oscillation coil  520  generates a magnetic field by an AC signal applied from the oscillator  510 . At this time, the magnetic field generated in the oscillation coil  520  induces a voltage in the receiving coil  530 . At this time, when the conductor approaches the periphery of the resonator  500 , the magnitude of the magnetic field generated in the oscillation coil  520  is reduced, thereby reducing the voltage induced in the receiving coil  530 . Then, the sensing device  540  is connected to the receiving coil  530  to sense the voltage induced in the receiving coil  540 , and to sense the position of the lens assembly based on this. 
     More specifically, the magnetic field generated in the oscillation coil  520  may be induced in the receiving coil  530 . In this case, as the position of the conductor changes in a situation where a magnetic field is generated in the receiving coil  530 , the overlap area between the receiving coil  530  and the conductor changes. 
     At this time, the receiving coil  530  resonates with the oscillation coil  520  to generate an AC frequency having a constant amplitude, the amount of eddy current generated varies according to the overlap area with the conductor. And, by the flow of such the eddy current, a magnetic flux in the opposite direction to the magnetic flux generated in the receiving coil  530  is generated, and the amplitude of the signal output to the oscillator  510  is reduced by the influence of the magnetic flux. Therefore, in the embodiment, an AC signal having a different amplitude is generated according to the overlap area between the receiving coil  530  and the conductor, and the sensing device  540  may sense the position of the lens assembly by sensing the intensity of the generated AC signal. 
     That is, the resonator described with reference to  FIGS. 19 a  to 20 c    has a structure including only an oscillation coil, and the resonator of  FIG. 21  has a structure including an oscillation coil and a receiving coil. In this case, the structure including the oscillation coil and the receiving coil may acquire an accurate sensing value without being affected by external noise compared to the structure including only the oscillation coil. That is, in the resonator including only the oscillation coil, the oscillation operation by the resonance frequency and the position sensing operation of the lens assembly by the conductor are performed using only the oscillation coil. Accordingly, in the resonator including only the oscillation coil, noise generated by an external magnetic material other than the conductor corresponding to the target directly affects the sensing value, and thus it may be difficult to accurately detect the position of the lens assembly. On the other hand, in the resonator including the oscillation coil and the receiving coil, a coil for performing an oscillation operation and a coil for acquiring a position sensing value by a conductor exist separately. Accordingly, in the resonator including the oscillation coil and the receiving coil, the external noise as described above is mutually canceled out between the oscillating coil and the receiving coil, so that the sensed value is not greatly affected, accordingly, it is possible to obtain a sensed value having a strong noise characteristic. 
     Hereinafter, a detailed arrangement structure of the resonance coil shown in  FIG. 21  will be described. 
       FIGS. 22 a  to 22 f    are plan views showing layer-by-layer structure of  FIG. 21 , and  FIG. 22 g    is a view for explaining a planar shape of the receiving coil shown in  FIGS. 22 a    to  22   f.    
     The resonator  500  according to the embodiment includes an insulating layer  550 , a receiving coil  530 , and an oscillation coil  520 . 
     In this case, the oscillation coil  520  may have the same structure as the resonance coil  420  described with reference to  FIG. 20 b   . For example, the oscillation coil  520  may include first to fourth portions  521 ,  522 ,  523 , and  524  having a four-layer structure. 
     In addition, the first to fourth portions  521 ,  522 ,  523 , and  524  may be connected in series with each other. In this case, the turn directions of adjacent portions may be opposite to each other so that the directions of currents flowing in the first to fourth portions  521 ,  522 ,  523 , and  524  are the same. 
     The insulating layer  550  may have a six-layer structure. That is, the insulating layer  550  may include a first insulating layer  551  disposed on the uppermost portion and a sixth insulating layer  556  disposed on the bottommost portion. In addition, second to fifth insulating layers  552 ,  553 ,  554 , and  555  may be sequentially disposed between the first insulating layer  551  and the sixth insulating layer  556 . 
     In this case, the upper surfaces of the first to sixth insulating layers  551 ,  552 ,  553 ,  554 ,  555  and  556  may be divided into a region where an oscillation coil is disposed and a region where a receiving coil is disposed. 
     For example, an edge region (or an outer region) of an upper surface of the first to sixth insulating layers  551 ,  552 ,  553 ,  554 ,  555  and  556  may be a first region in which an oscillation coil is disposed. In addition, a second region other than the first region among upper surfaces of the first to sixth insulating layers  551 ,  552 ,  553 ,  554 ,  555  and  556  may be a region in which a receiving coil is disposed. Preferably, the second region may be a central region of the upper surface of the first to sixth insulating layers  551 ,  552 ,  553 ,  554 ,  555 ,  556 , and the first region may be an outer region that surrounds the first region. 
     A first portion  521  of the oscillation coil  520  may be disposed on the first insulating layer  551 . Preferably, the first portion  521  of the oscillation coil  520  may be disposed on the first region of the first insulating layer  551 . 
     A second portion  522  of the oscillation coil  520  and a portion of the receiving coil  530  may be disposed on the second insulating layer  552 . In this case, the number of receiving coils  530  in the embodiment may be plural. For example, the receiving coil  530  in the embodiment may include a first receiving coil  530   a  and a second receiving coil  530   b.    
     In addition, the second portion  522  of the oscillation coil  520  and the first portion  531  of the first receiving coil  530   a  may be disposed in the first region of the second insulating layer  552 . 
     A portion of the receiving coil  530  may be disposed on the third insulating layer  553 . Preferably, the second portion  532  of the first receiving coil  530   a  connected to the first portion  531  may be disposed in the second region of the third insulating layer  553 . The first portion  531  and the second portion  532  of the first receiving coil  530   a  may be interconnected at a plurality of points through vias (not shown). In this case, the first receiving coil  530   a  including the first portion  531  and the second portion  532  may have a shape in which a sine wave and a cosine wave are mixed. 
     A portion of the receiving coil  530  may be disposed on the fourth insulating layer  554 . Preferably, the first portion  533  of the second receiving coil  530   b  may be disposed on the second region of the fourth insulating layer  554 . 
     A third portion  523  of the oscillation coil  520  and a second portion  534  of the second receiving coil  530   b  may be disposed on the fifth insulating layer  555 . Preferably, the third portion  523  of the oscillation coil  520  may be disposed in the first region of the upper surface of the fifth insulating layer  555 . In addition, the second portion  534  of the second receiving coil  530   b  may be disposed in the second region of the upper surface of the fifth insulating layer  555 . 
     The second receiving coil  530   b  may include a first portion  533  and a second portion  534  respectively disposed on the fourth insulating layer  554  and the fifth insulating layer  555 . The first portion  533  and the second portion  534  of the second receiving coil  530   b  may be interconnected at a plurality of points through vias (not shown). In this case, the second receiving coil  530   b  including the first portion  533  and the second portion  534  may have a shape in which a sine wave and a cosine wave are mixed. 
     A fourth portion  524  of the oscillation coil  520  may be disposed on the sixth insulating layer  556 . Preferably, the fourth portion  524  of the oscillation coil  520  may be disposed in the first region of the sixth insulating layer  556 . 
     Referring to  FIG. 22 g   , each of the first receiving coil  530   a  and the second receiving coil  530   b  constituting the receiving coil  530  may have a shape in which a sine wave and a cosine wave are mixed. In addition, each of the first receiving coil  530   a  and the second receiving coil  530   b  has the above shape through interconnection of coil patterns disposed on a plurality of layers, respectively. In this case, the sine wave and the cosine wave may include a rising part and a falling part. 
     In addition, a rising part and a falling part of each of the first receiving coil  530   a  and the second receiving coil  530   b  may be disposed on different layers. 
     For example, a rising part of the first receiving coil  530   a  may be disposed on the second insulating layer  552 , and a falling part of the first receiving coil  530   a  may be disposed on the third insulating layer  553 . That is, the first portion  531  of the first receiving coil  530   a  disposed on the second insulating layer  552  may be the rising part, and the second portion  532  of the first receiving coil  530   a  disposed on the third insulating layer  553  may be the falling part. 
     For example, a rising part of the second receiving coil  530   b  may be disposed on the fourth insulating layer  554 , and a falling part of the second receiving coil  530   b  may be disposed on the fifth insulating layer  555 . That is, the first portion  533  of the second receiving coil  530   b  disposed on the fourth insulating layer  554  may be the rising part, and the second portion  534  of the second receiving coil  530   b  disposed on the fifth insulating layer  555  may be the falling part. 
       FIG. 23  is a view showing an equivalent circuit diagram of the resonance coil shown in  FIG. 21 . 
     Referring to  FIG. 23 , it may be connected to the oscillator  510  of the oscillation coil  520 . 
     In addition, one end of the first receiving coil  530   a  and one end of the second receiving coil  530   b  may be connected to each other, and thus may be commonly grounded to the ground. 
     In addition, the other end of the first receiving coil  530   a  may be connected to one end of the sensing device  540 , and the other end of the second receiving coil  530   b  may be connected to the other end of the sensing device  540 . 
     Accordingly, the sensing device  540  may mutually subtract and/or add signals sensed from the first receiving coil  530   a  and the second receiving coil  530   b , and may detect the position of the lens assembly based on this. 
     Next,  FIG. 24  is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied. 
     Referring to  FIG. 24 , the mobile terminal  1500  according to the embodiment may include a camera module  1000 , a flash module  1530 , and an autofocus device  1510  provided on the rear side. 
     The camera module  1000  may include an image capturing function and an auto focus function. For example, the camera module  1000  may include an auto-focus function using an image. 
     The camera module  1000  processes an image frame of a still image or a moving image obtained by an image sensor in a shooting mode or a video call mode. The processed image frame may be displayed on a predetermined display unit and stored in a memory. A camera (not shown) may also be disposed on the front of the mobile terminal body. 
     For example, the camera module  1000  may include a first camera module  1000 A and a second camera module  1000 B, and OIS may be implemented together with an AF or zoom function by the first camera module  1000 A. 
     The flash module  1530  may include a light emitting device emitting light therein. The flash module  1530  may be operated by a camera operation of a mobile terminal or a user&#39;s control. 
     The autofocus device  1510  may include one of the packages of the surface light emitting laser device as a light emitting part. 
     The auto focus device  1510  may include an auto focus function using a laser. The auto focus device  1510  may be mainly used in a condition in which the auto focus function using the image of the camera module  1000  is deteriorated, for example, in proximity of 10 m or less or in a dark environment. The autofocus device  1510  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.