Patent Publication Number: US-11653103-B2

Title: Lens moving apparatus and camera module and portable terminal including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 16/703,131, filed Dec. 4, 2019; which is a continuation of U.S. application Ser. No. 16/356,913, filed Mar. 18, 2019, now U.S. Pat. No. 10,531,012, issued Jan. 7, 2020; which is a continuation of U.S. application Ser. No. 16/149,618, filed Oct. 2, 2018, now U.S. Pat. No. 10,284,787, issued May 7, 2019; which is a continuation of U.S. application Ser. No. 15/921,202, filed Mar. 14, 2018, now U.S. Pat. No. 10,122,938, issued Nov. 6, 2018; which is a continuation of U.S. application Ser. No. 15/137,549, filed Apr. 25, 2016, now U.S. Pat. No. 9,955,086, issued Apr. 24, 2018; which claims priority under 35 U.S.C. § 119 to Korean Patent Application Nos. 10-2015-0057836, filed on Apr. 24, 2015; and 10-2015-0090872, filed on Jun. 26, 2015; which are hereby incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     Embodiments relate to a lens moving apparatus and to a camera module and a portable terminal each including the same. 
     BACKGROUND 
     Cellular phones or smart phones, which are equipped with a camera module for fulfilling a function of taking a picture of an object and storing the still image or moving image based on the picture, are continually being developed. A camera module may generally include an image sensor module and a voice coil motor (VCM) for controlling the distance between a lens and the image sensor module. 
     Information technology products, such as cellular phones, smart phones, tablet PCs, notebook computers and the like, are provided therein with an ultracompact camera module. A voice coil motor may perform auto-focusing for controlling the distance between an image sensor and a lens so as to adjust the focal length of the lens. 
     A camera module may finely shake due to trembling of user&#39;s hand while a picture of an object is being taken. In this regard, in order to correct the distortion of images or moving images caused by the trembling of a user&#39;s hand, voice coil motors incorporating optical image stabilizers (OIS) are being developed. 
     In auto-focusing performed in a lens moving apparatus, a moving position of a bobbin in a first direction is controlled by detecting displacement of the bobbin in the first direction, which is the optical direction. 
     When an additional position detecting sensor is used in order to detect displacement of a bobbin in the first direction, there is a need to provide an additional PCB to mount the mounting of the position detecting sensor and to provide a structure for securing the PCB to a housing and a bobbin. Consequently, the cost of manufacturing the lens moving apparatus is increased due to the complicated structure, and the space required to install the additional component makes it difficult to realize a lens having large diameter. 
     In addition, since the additional position detecting sensor exhibits an extremely restricted linear range in its output due to the positional relationship between the position detecting sensor and a magnet, there is a necessity for improvement. 
     SUMMARY 
     Embodiments provide a lens moving apparatus, and a camera module and a portable terminal each including the same, which are able to assure linearity over a wider range, to increase a defect rate, and to perform more accurate AF feedback control. 
     Furthermore, embodiments provide a lens moving apparatus, and a camera module and a portable terminal each including the same, which are able to detect the position of a bobbin in a first direction using a simplified structure. 
     In one embodiment, a lens moving apparatus includes a housing supporting a magnet, a bobbin having an outer circumferential surface on which a first coil is disposed, the bobbin moving in the housing in a first direction, upper and lower elastic members each connected to both the housing and the bobbin, and a second coil disposed so as to be spaced apart from the first coil in the first direction, wherein the second coil generates induction voltage resulting from inductive interaction with the first coil when the bobbin moves in the first direction. 
     In another embodiment, a lens moving apparatus includes a housing supporting a first magnet, a bobbin disposed in the housing so as to be moved in the housing in a first direction, a first coil disposed on an outer circumferential surface of the bobbin so as to be opposite to the first magnet, an upper elastic member disposed above the bobbin so as to elastically support movement of the bobbin in the first direction, a lower elastic member disposed under the bobbin so as to elastically support the movement of the bobbin in the first direction, a second coil disposed under the first magnet, and a third coil disposed outside the housing. 
     In still another embodiment, a camera module includes the lens moving apparatus, and an image sensor mounted on the lens moving apparatus. 
     In a further embodiment, a portable terminal includes a display module including a plurality of pixels, the plurality of pixels exhibiting colors that vary in response to an electrical signal, a camera module according to claim  19 , for converting an image, introduced through a lens, into an electrical signal, and a controller for controlling operation of the display module and the camera module. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Arrangements and embodiments may be described in detail with reference to the following drawings in which like reference numerals refer to like elements and wherein: 
         FIG.  1    is an exploded perspective view of a lens moving apparatus according to an embodiment of the present invention; 
         FIG.  2    is an assembled perspective view of the lens moving apparatus shown in  FIG.  1   , from which a cover member has been removed; 
         FIG.  3    is a schematic exploded perspective view illustrating a housing, a magnet and a circuit board, which are shown in  FIG.  1   ; 
         FIG.  4    is an assembled perspective view illustrating the housing, the magnet and the circuit board, which are shown in  FIG.  3   ; 
         FIG.  5    is a plan view illustrating the upper elastic member shown in  FIG.  1   ; 
         FIG.  6    is a plan view illustrating the lower elastic member shown in  FIG.  1   ; 
         FIG.  7 A  illustrates the conductive connection between the first circuit board and the upper elastic member, shown in  FIG.  1   , and the conductive connection between a first coil and the upper elastic member, shown in  FIG.  1   ; 
         FIG.  7 B  illustrates the conductive connection between the lower elastic member and a second coil, shown in  FIG.  1   ; 
         FIG.  8    is a view illustrating the second coil and a blocking member, which are mounted on a base; 
         FIG.  9    is a view illustrating the disposition of a second coil according to another embodiment; 
         FIG.  10    a view illustrating the conductive connection between the second coil and the first and second upper elastic members, shown in  FIG.  9   ; 
         FIG.  11    is an exploded perspective view of a lens moving apparatus according to another embodiment; 
         FIG.  12    is an assembled perspective view of the lens moving apparatus, from which the cover member shown in  FIG.  11    has been removed; 
         FIG.  13    is a first perspective view of the bobbin shown in  FIG.  11   ; 
         FIG.  14    is a second perspective view of the bobbin shown in  FIG.  11   ; 
         FIG.  15    is a first perspective view illustrating the housing and the second coil, which are shown in  FIG.  11   ; 
         FIG.  16    is a second perspective view illustrating the housing shown in  FIG.  11   ; 
         FIG.  17    is a perspective view illustrating the upper elastic member and the lower elastic member, which are shown in  FIG.  11   ; 
         FIG.  18    is a cross-sectional view of the lens moving apparatus, which is taken along line A-B in  FIG.  12   ; 
         FIG.  19    is an exploded perspective view illustrating the base, the circuit board, the third coil and the first and second position sensors, which are shown in  FIG.  11   ; 
         FIG.  20 A  is a schematic view illustrating the bobbin, the first coil, the magnet, the housing and the second coil, which are shown in  FIG.  1   , explaining the application of voltage to the second coil; 
         FIG.  20 B  is a schematic view explaining the inductive interaction between the first coil and the second coil; 
         FIG.  21    is an exploded perspective view illustrating a camera module according to an embodiment; 
         FIG.  22    is a perspective view illustrating a lens moving apparatus according to a further embodiment; 
         FIG.  23    is an exploded perspective view illustrating the lens moving apparatus according to the further embodiment; 
         FIG.  24    is an exploded perspective view illustrating the base, the circuit board and the second coil according to the embodiment; 
         FIG.  25    is a perspective view illustrating the lens moving apparatus according to the further embodiment, from which the cover member is removed; 
         FIG.  26    is a plan view of  FIG.  25   ; 
         FIG.  27    is a cross-sectional view of  FIG.  25   ; 
         FIG.  28    is a perspective view illustrating the lens moving apparatus shown in  FIG.  25   , from which the bobbin is removed; 
         FIG.  29    is a perspective view illustrating the lens moving apparatus shown in  FIG.  28   , from which the third coil is removed; 
         FIG.  30    is a perspective view illustrating the lens moving apparatus according to the embodiment, from which the cover member is removed; 
         FIG.  31    is a plan view of  FIG.  30   ; 
         FIG.  32    is a cross-sectional view of  FIG.  30   ; 
         FIG.  33    is a perspective view illustrating the lens moving apparatus shown in  FIG.  30   , from which the bobbin is removed; 
         FIG.  34    is a perspective view illustrating the lens moving apparatus shown in  FIG.  33   , from which the third coil is removed; 
         FIG.  35    is an enlarged view illustrating portion A in  FIG.  34   ; 
         FIG.  36    is a perspective view illustrating a portable terminal according to an embodiment of the present invention; and 
         FIG.  37    is a view illustrating the configuration of the portable terminal shown in  FIG.  36   . 
     
    
    
     DESCRIPTION OF SPECIFIC EMBODIMENTS 
     Hereinafter, embodiments will be described with reference to the annexed drawings. In the drawings, the same or similar elements are denoted by the same reference numerals even though they are depicted in different drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the disclosure rather unclear. Those skilled in the art will appreciate that some features in the drawings are exaggerated, reduced, or simplified for ease of description, and drawings and elements thereof are not always shown at the proper scale. 
     For reference, in the respective drawings, a rectangular coordinate system (x, y, z) may be used. In the drawings, the x-axis and the y-axis mean a plane perpendicular to an optical axis and, for convenience, an optical axis (z-axis) direction may be referred to as a first direction, an x-axis direction may be referred to as a second direction, and a y-axis direction may be referred to as a third direction. 
       FIG.  1    is an exploded perspective view of a lens moving apparatus  100  according to an embodiment of the present invention.  FIG.  2    is an assembled perspective view of the lens moving apparatus  100  shown in  FIG.  1   , from which a cover member  300  have been removed. 
     Referring to  FIGS.  1  and  2   , the lens moving apparatus  100  includes a cover member  300 , a bobbin  110 , a first coil  120 , a magnet  130 , a housing  140 , an upper elastic member  150 , a lower elastic member  160 , a second coil  170 , a base  210  and a circuit board  250 . 
     First, the cover member  300  will be described. 
     The cover member  300  defines an accommodation space along with the base  210  so as to accommodate different components  110 ,  120 ,  130 ,  140 ,  150 ,  160  and  250 . 
     The cover member  300  may generally take the form of a box which is open at the lower face thereof and has an upper end and side walls, and the lower portion of the cover member  300  may be coupled to the top of the base  210 . The upper end of the cover member may have a polygonal shape, for example, a rectangular shape or an octagonal shape. 
     The cover member  300  may have a hole formed in the upper end thereof in order to expose a lens (not shown) coupled to the bobbin  110  to outside light. In addition, the hole in the cover member  300  may further be provided with a window formed of a light-transmitting material, in order to inhibit impurities, such as dust or moisture, from infiltrating into a camera module. 
     The cover member  300  may be made of a non-magnetic material such as SUS in order to inhibit it from being attracted to the magnet  130 , but may also be made of a magnetic material so as to serve as a yoke. 
     Next, the bobbin  110  will be described. 
     The bobbin  110  is disposed inside the housing  140 , and is movable in the first direction (for example, the z-axis direction or the optical direction) via electromagnetic interaction between the first coil  120  and the first magnet  130 . 
     Although not shown in the drawings, the bobbin  110  may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel may be coupled inside the bobbin  110  in various manners. 
     The bobbin  110  may have therein a bore for the mounting of the lens or the lens barrel. The bore in the bobbin  110  may have a circular, elliptical, or polygonal section, which coincides with the shape of the lens or the lens barrel to be mounted, without being limited thereto. 
     The bobbin  110  may include at least one upper support protrusion  113 , which is formed on the upper surface thereof and is coupled and secured to the inner frame of the upper elastic member, and at least one lower support protrusion (not shown), which is formed on the lower surface thereof and is coupled and secured to an inner frame  161  of the lower elastic member  160 . 
     The bobbin  110  may include an upper avoidance recess  112 , which is formed in the region of the upper surface thereof that corresponds to a connection portion  153  of the upper elastic member  150 . The bobbin  110  may further include a lower avoidance recess (not shown), which is formed in a region of the lower surface thereof that corresponds to a connection portion  163  of the lower elastic member  150 . In another embodiment, the connection portion  153  of the upper elastic member  150  and the bobbin  110  may be designed so as not to interfere with each other, and the upper avoidance recess and/or the lower avoidance recess of the bobbin  110  may not be formed. 
     By virtue of the upper avoidance recess  112  and the lower avoidance recess (not shown) of the bobbin  110  according to the embodiment, when the bobbin  110  moves in the first direction, spatial interference between the connection portions  153  and  163  of the upper and lower elastic member  150  and  160  and the bobbin  110  may be inhibited, and the connection portions  153  and  163  of the upper and lower elastic members  150  and  160  may be easily and elastically deformed. 
     The bobbin  110  may include at least one recess (not shown), which is formed in the outer circumferential surface thereof such that the first coil  120  is disposed or mounted in the recess. The first coil  120  may be disposed or mounted in the recess. The shape and number of recesses may be varied so as to correspond to the shape and number of coils disposed on the outer circumferential surface of the bobbin  110 . In another embodiment, the bobbin  110  may not include the recess for mounting the coil, and the first coil  120  may be directly wound around and secured to the outer circumferential surface of the bobbin  110 . 
     Next, the first coil will be described. 
     The first coil  120  is disposed on the outer circumferential surface of the bobbin  110  so as to electromagnetically interact with the magnet  130  disposed on the housing  140 . In order to create the electromagnetic force resulting from the electromagnetic interaction with the magnet  130 , a driving signal may be applied to the first coil  120 . 
     By the electromagnetic force resulting from the electromagnetic interaction between the first coil  120  and the magnet  130 , the bobbin  110 , which is elastically supported by the upper and lower elastic members  150  and  160 , may be moved in the first direction. The movement of the bobbin  110  in the first direction may be controlled by controlling the electromagnetic force, thereby enabling the auto-focusing function to be fulfilled. 
     The first coil  120  may be wound around the outer circumferential surface of the bobbin  110  in such a manner as to wind the first coil  120  clockwise or counterclockwise about the optical axis. In another embodiment, the first coil  120  may be embodied as a coil ring, which is constructed by winding the first coil  120  clockwise or counterclockwise about an axis perpendicular to the optical axis, and the number of coil rings may be the same as the number of magnet  130 , without being limited thereto. 
     The first coil  120  may be conductively connected to at least one of the upper and lower elastic members  150  and  160 . A driving signal may be applied to the first coil  120  through at least one of the upper and lower elastic members  150  and  160 . 
     Next, the housing  140  will be described. 
       FIG.  3    is a schematic exploded perspective view illustrating the housing  140 , the magnet  130  and the circuit board  250 , which are shown in  FIG.  1   .  FIG.  4    is an assembled perspective view illustrating the housing  140 , the magnet  130  and the circuit board  250 , which are shown in  FIG.  3   . 
     Referring to  FIGS.  3  and  4   , the housing  140  supports the magnet  130  and the circuit board  250 , and accommodates the bobbin  110  therein so as to allow the bobbin  110  to move in the first direction, which is parallel to the optical axis. 
     The housing  140  may be configured to have a hollow column shape overall. For example, the housing  140  may include four side walls  140   a  to  140   d , and may have a polygonal (e.g., a square or octagonal) or circular bore. 
     The side walls  140   a  to  140   d  of the housing  140  may include magnet holes  141   a ,  141   a ′,  141   b  and  141   b ′, in which magnets  130  are mounted, disposed or secured. Although the magnet holes  141   a ,  141   a ′,  141   b  and  141   b ′ are shown in  FIG.  3    as having the form of a through-hole, the magnet hole may alternatively take the form of a recess, without being limited thereto. 
     The housing  140  may include a first stopper  143 , which protrudes from the upper surface thereof. 
     The first stopper  143  of the housing  140 , which is intended to inhibit the cover member  300  from colliding with the housing  140 , may inhibit the upper surface of the housing  140  from directly colliding with the inner surface of the upper portion of the cover member  300  upon the application of external impact. 
     The housing  140  may be provided on the upper surface thereof with a plurality of upper frame support protrusions  144  to which an outer frame  152  of the upper elastic member  150  is coupled. The housing  140  may be provided on the lower surface thereof with a plurality of lower frame support protrusions  147  to which an outer frame  162  of the lower elastic member  160  is coupled. 
     The housing  140  may be provided in the corners thereof with lower guide recesses  148 , to which guide members  216  of the base  210  are fitted, fastened or coupled. 
     Next, the magnet  130  will be described. 
     The magnet  130  may be disposed in the housing  140  so as to correspond to or to be aligned with the first coil  120 . 
     For example, the magnet  130  may be disposed in the magnet holes  141   a ,  141   a ′,  141   b  and  141   b ′ of the housing  140  so as to overlap the first coil  120  in the second and/or third direction. 
     In another embodiment, the magnet  130  may be disposed inside or outside the side walls  140   a  to  140   d  of the housing  140  without forming the magnet holes in the side walls  140   a  to  140   d  of the housing  140 . 
     The magnet  130  may be configured to have a shape corresponding to the side walls  140   a  to  140   d  of the housing  140 , for example, a rectangular shape, without being limited thereto. 
     The magnet  130  may be a monopolar magnetized magnet or a bipolar magnetized magnet, which is oriented such that the inner surface of the magnet, which faces the first coil  120  serves as an S pole, and the opposite outer surface of the magnet serves as an N pole. However, the disclosure is not limited thereto, and the reverse configuration is also possible. 
     Although the number of magnets  30  is four in the embodiment, the number of magnets may be at least two, without being limited thereto. Although the inner surface of the magnet  130  that faces the first coil  120  may be configured to be flat, the surface may be configured to be curved, without being limited thereto. 
     Next, the upper elastic member  150  and the lower elastic member  160  will be described. 
       FIG.  5    is a plan view illustrating the upper elastic member  150  shown in  FIG.  1   .  FIG.  6    is a plan view illustrating the lower elastic member  160  shown in  FIG.  1   . 
     Referring to  FIGS.  5  and  6   , the upper elastic member  150  and the lower elastic member  160  are coupled to the bobbin  110  and the housing  140  so as to elastically support the bobbin  110 . 
     For example, the upper elastic member  150  may be coupled to an upper portion, upper surface or upper end of the bobbin  110  and an upper portion, upper surface or upper end of the housing  140 , and the lower elastic member  160  may be coupled to a lower portion, lower surface or lower end of the bobbin  110  and a lower portion, lower surface of lower end of the housing  140 . 
     At least one of the upper elastic member  150  and the lower elastic member  160  may be divided into two segments. 
     For example, the upper elastic member  150  may include first and second upper elastic members  150   a  and  150   b , which are conductively separated from each other, and the lower elastic member  160  may include first and second lower elastic members  160   a  and  160   b , which are conductively separated from each other. Although each of the upper elastic member  150  and the lower elastic member  160  may be embodied as a leaf spring, they may also be embodied as a coil spring, a suspension wire or the like, without being limited thereto. 
     Each of the first and second upper elastic members  150   a  and  150   b  may include an inner frame  151  coupled to the upper support protrusion  113  of the bobbin  110 , an outer frame  152  coupled to the upper frame support protrusion  144  of the housing  140 , and a first connection portion  153  connecting the inner frame  151  and the outer frame  152  to each other. 
     Each of the first and second lower elastic members  160   a  and  160   b  may include an inner frame  161  coupled to the lower support protrusion of the bobbin  110 , an outer frame  162  coupled to the lower frame support protrusion  147  of the housing  140 , and a second connection portion  163  connecting the inner frame  161  and the outer frame  162  to each other. 
     Each of the connection portions  153  and  163  of the upper and lower elastic members  150  and  160  may be bent or curved at least once so as to form a predetermined pattern. The upward and/or downward movement in the first direction of the bobbin  110  may be elastically (flexibly) supported by positional change or fine deformation of the connection portions  153  and  163 . 
     The inner frame  151  of the first upper elastic member  150   a  may include a first inner connector R 1 , and the inner frame  151  of the second upper elastic member  150   b  may include a second inner connector R 2 . 
     One end of the first coil  120  (for example, the starting end of the first coil  120 ) may be conductively connected to the first inner connector R 1  of the first upper elastic member  150   a , and the other end of the first coil  120  (for example, the terminating end of the first coil  120 ) may be conductively connected to the second inner connector R 2  of the second upper elastic member  150   b.    
     The outer frame  152  of the first upper elastic member  150   a  may include a first outer connector Q 1 , and the outer frame  152  of the second upper elastic member  150   b  may include a second outer connector Q 2 . 
     A first terminal  251 - 1  of the circuit board  250  may be conductively connected to the first outer connector Q 1 , and a second terminal  251 - 2  of the circuit board  250  may be conductively connected to the second outer connector Q 2 . 
     The inner frame  161  of the first lower elastic member  160   a  may include a third inner connector R 3 , and the inner frame  161  of the second upper elastic member  160   b  may include a fourth inner connector R 4 . 
     One end of the second coil  170  (for example, the starting end of the second coil  170 ) may be conductively connected to the third inner connector R 3 , and the other end of the second coil  170  (for example, the terminating end of the second coil  170 ) may be conductively connected to the fourth inner connector R 4 . 
     The outer frame  162  of the first lower elastic member  160   a  may include a third outer connector Q 3 , and the outer frame  162  of the second lower elastic member  160   b  may include a fourth outer connector Q 4 . 
     A third terminal  251 - 3  of the circuit board  250  may be conductively connected to the third outer connector Q 3 , and a fourth terminal  251 - 4  of the circuit board  250  may be conductively connected to the fourth outer connector Q 4 . 
     Bonding between the first coil  120  and the first and second inner connectors R 1  and R 2 , bonding between the circuit board  250  and the first and second outer connectors Q 1  and Q 2 , bonding between the second coil  170  and the third and fourth inner connectors R 3  and R 4 , and bonding between the circuit board  250  and the third and fourth outer connectors Q 3  and Q 4  may be implemented using thermal fusion, soldering or conductive epoxy (for example, Ag epoxy). 
     The first and second inner connectors R 1  and R 2  and the first and second outer connectors Q 1  and Q 2  may be disposed at various positions in accordance with a design specification. 
     In order to facilitate connection to the circuit board  250 , the first and second inner connectors R 1  and R 2  and the first and second outer connectors Q 1  and Q 2  may be positioned at the inner frames and the outer frames of the first and second upper elastic members  150   a  and  150   b , which are positioned adjacent to the circuit board  250 . 
     The first inner connector R 1  may be positioned at one end of the inner frame  151  of the first upper elastic member  150   a , and the second inner connector R 2  may be positioned at one end of the inner frame  151  of the second upper elastic member  150   b . As illustrated in  FIG.  5   , the distance between one end of the inner frame of the first upper elastic member  150   a  and one end of the inner frame of the second upper elastic member  150   b  may be shorter than the distance between the one end of the inner frame of the first upper elastic member  150   a  and the other end of the inner frame of the second upper elastic member  150   b.    
     In another embodiment, the distance between the one end of the inner frame of the first upper elastic member  150   a  and the one end of the inner frame of the second upper elastic member  150   b  may be longer than the distance between the one end of the inner frame of the first upper elastic member  150   a  and the other end of the inner frame of the second upper elastic member  150   b.    
     The first outer connector Q 1  may be positioned at one end of the outer frame  152  of the first upper elastic member  150   a , and the second outer connector Q 2  may be positioned at one end of the outer frame  152  of the second upper elastic member  150   b . As illustrated in  FIG.  5   , the distance between the one end of the outer frame of the first upper elastic member  150   a  and the one end of the outer frame of the second upper elastic member  150   b  may be shorter than the distance between the one end of the outer frame of the first upper elastic member  150   a  and the other end of the outer frame of the second upper elastic member  150   b.    
     In another embodiment, the distance between the one end of the outer frame of the first upper elastic member  150   a  and the one end of the outer frame of the second upper elastic member  150   b  may be longer than the distance between the one end of the outer frame of the first upper elastic member  150   a  and the other end of the outer frame of the second upper elastic member  150   b.    
     Each of the first and second upper elastic members  150   a  and  150   b  may have a first through hole  151   a  or recess  151   a , which is formed in the inner frame  151  and is coupled to the upper support protrusion  113  of the bobbin  110 , and a second through hole  152   a  or recess, which is formed in the outer frame  152  and is coupled to the upper frame support protrusion  144  of the housing  140 . 
     Similarly, each of the first and second lower elastic members  160   a  and  160   b  may have therein a third through hole  161   a  or recess, which is formed in the inner frame  161  and is coupled to the lower support protrusion of the bobbin  110 , and a fourth through hole  162   a  or recess, which is formed in the outer frame  162  and is coupled to the lower frame support protrusion of the housing  140 . 
     Bonding between the upper and lower elastic members  150  and  160  and the bobbin  110  and bonding between the upper and lower elastic members  150  and  160  and the housing  140  may be implemented using, for example, thermal fusion and/or adhesive. 
     Next, the circuit board  250  will be described. 
     The circuit board  250  may be disposed at, coupled to or mounted on the housing  140 , and may be conductively connected to at least one of the upper and lower elastic members  150  and  160 . The circuit board  250  may be a printed circuit board, for example, an FPCB, a PCB or a ceramic board. 
     In an example, the circuit board  250  may be secured to, supported by or disposed on one of four side walls  140   a  to  140   d  (for example,  140   c ) of the housing  140  without being limited thereto. In another embodiment, the circuit board  250  may be supported by the upper surface of the housing  140 . 
     The circuit board  250  may include a plurality of terminals  251  so as to receive a driving signal from the outside and to supply the driving signal to the first coil  120 . 
     The circuit board  250  may receive a voltage, which is induced to the second coil  170  by electromotive force resulting from inductive interaction between the first coil  120  and the second coil  170 . 
     For example, the circuit board  250  may include two terminals  251 - 1  and  251 - 2  for supplying a first voltage (for example, +voltage) and a second voltage (for example, −voltage) to the first coil  120 , and two terminals  251 - 3  and  251 - 4  for receiving the voltage induced from the second coil  170 . 
       FIG.  7 A  illustrates the conductive connection between the first circuit board  250  and the upper elastic member  150 , shown in  FIG.  1   , and the conductive connection between the first coil  120  and the upper elastic member  150 , shown in  FIG.  1   . 
     Referring to  FIG.  7 A , the first inner connector R 1  of the first upper elastic member  150   a  may constitute a conductive connection  256   a  along with an end of the first coil  120 , and the first outer connector Q 1  of the first upper elastic member  150   a  may constitute a conductive connection  258   a  along with the circuit board  250 . 
     The second inner connector R 2  of the second upper elastic member  150   b  may constitute a conductive connection  256   b  to the other end of the first coil  120 , and the second outer connector Q 2  of the second upper elastic member  150   b  may constitute a conductive connection  258   b  to the circuit board  250 . 
       FIG.  7 B  illustrates the conductive connection between the lower elastic member  160  and the second coil  170 , shown in  FIG.  1   . 
     Referring to  FIG.  7 B , the third inner connector R 3  of the first lower elastic member  160   a  may constitute a conductive connection (not shown) to one end of the second coil  170 , and the third outer connector Q 3  of the first lower elastic member  160   a  may constitute a conductive connection (not shown) to the circuit board  250 . 
     The fourth inner connector R 4  of the second lower elastic member  160   b  may constitute a conductive connection  257   b  to the other end of the second coil  170 , and the fourth outer connector Q 4  of the second lower elastic member  160   b  may constitute a conductive connection to the circuit board  250 . 
     The first voltage (for example, +voltage) and the second voltage (for example, −voltage), which are supplied to the circuit board  250 , may be applied to the first coil  120  through the conductive connections  256   a  and  256   b ,  258   a  and  258   b.    
     The voltage induced to the second coil  170  may be supplied to the circuit board  250  through the conductive connections between the second coil  170  and the first and second lower elastic members  160   a  and  160   b  and the conductive connections between the first and second lower elastic members  160   a  and  160   b  and the circuit board  250 . 
     Next, the base  210  and the second coil  170  will be described. 
     The base  210  may be coupled to the cover member  300  so as to define a space for accommodating the bobbin  110  and the housing  140  therein. The base  210  may have a bore, which corresponds to the bore of the bobbin  110  and/or the bore of the housing  140 , and may be configured to have a shape, for example, a rectangular shape, which coincides with or corresponds to the cover member  300 . 
     The base  210  may include a stepped portion  211  (see  FIG.  2   ), to which an adhesive is applied when the base is adhesively secured to the cover member  300 . The stepped portion  211  may guide the coupling of a cover member  300  thereto, and may be coupled to the end of the cover member  300  in a surface-contact manner. 
     The base  210  may include guide members  216 , which protrude upward in the vertical direction from four corners thereof by a predetermined height. The guide members  216  may be configured to have a polygonal column shape without being limited thereto. The guide members  216  may be fitted in, fastened to or coupled to the lower guide recesses  148  of the housing  140 . 
     The second coils  170  may be placed on the upper surface of the base  210  so as to be spaced apart from the first coil  120  in the first direction. For example, the second coil  170  may be disposed between the lower elastic member  160  and the base  210 . The base  210  may be provided in the upper surface thereof with a groove  212  (see  FIG.  8   ), into which the second coil  170  is fitted, mounted and secured. In another embodiment, the second coil  170  may be mounted on the lower surface of the base  210 , or may be fitted into a groove formed in the lower surface of the base  210 . 
     The second coil  170  may be wound clockwise or counterclockwise about the optical axis without being limited thereto. The second coil  170  may correspond to the first coil  120  or may be aligned with the first coil  120  without being limited thereto. 
     Although the second coil  170  is shown in  FIG.  1    as having a ring shape, the disclosure is not limited thereto. The second coil  170  may be embodied to take the form of a PCB or an FP coil. 
       FIG.  20 A  is a schematic view illustrating the bobbin  110 , the first coil  120 , the magnet  130 , the housing  140  and the second coil  170 , which are shown in  FIG.  1   , for explaining the application of a voltage to the second coil  170 .  FIG.  20 B  is a schematic view explaining the inductive interaction between the first coil  120  and the second coil  170 . 
     Referring to  FIGS.  20 A and  20 B , a driving signal Din, which is applied to the first coil  120 , may be an AC signal, for example, a sine wave signal or a pulse signal (for example, a pulse width modulation (PWM) signal). In another embodiment, the driving signal Din, which is applied to the first coil  120 , may include an AC signal and a DC signal. The application of an AC signal is intended to induce an electromotive force or a voltage to the second coil  170  via the inductive interaction. 
     In response to the driving signal Din, the first coil  120  may be moved in the first direction along with the bobbin  110  by an electromagnetic force resulting from the electromagnetic interaction between the current flowing through the first coil  120  and the magnet  130 . 
     As the first coil  120  moves in the first direction, the distance D 1  between the first coil  120  and the second coil  170  varies, thereby inducing a voltage Dout to the second coil  170 . For example, as the distance D 1  is reduced, the voltage applied to the second coil  170  may be increased. In contrast, as the distance D 1  is increased, the voltage applied to the second coil  170  may be reduced. 
     Based on the voltage applied to the second coil  170 , displacement of the first coil  120  may be detected, and the driving signal supplied to the first coil  120  may be controlled. 
     In order to inhibit noise, for example, PWM noise, from being transmitted to an image sensor mounted on the camera module, the lens moving apparatus  100  may further include a blocking member  180  (see  FIG.  8   ), which is provided under the second coil  170  so as to block an electromagnetic field. However, another embodiment may not include an additional blocking member. 
       FIG.  8    illustrates the second coil  170  and the blocking member  180 , which are mounted on the base  210 . 
     Referring to  FIG.  8   , the blocking member  180  may be disposed in the groove  212  in the base  210 , and the second coil  170  may be placed on the blocking member  180  fitted in the groove  212  in the base  210 . For example, the blocking member  180  may be disposed between the base  210  and the second coil  170 . The blocking member  180  may be made of metal containing a Fe component. 
       FIG.  9    illustrates the disposition of a second coil  170   a  according to another embodiment. 
     Referring to  FIG.  9   , the second coil  170   a  may be disposed on the housing  140 , unlike the configuration shown in  FIG.  8   . For example, the second coil  170   a  may be disposed on the upper end of the housing  140  so as to be spaced apart from the upper elastic member  150 . Specifically, the second coil  170   a , which is disposed on the upper end of the housing  140 , may be positioned above the first coil  120  but under the upper elastic member  150 . 
     The side walls  140   a  to  140   d  of the housing  140  may include a support portion  149  supporting the second coil  170   a . The support portion  149  may be positioned on the inner surface of the side walls  140   a  to  140   d  of the housing  140 . 
     Although  FIG.  9    illustrates the second coil  170   a , which is disposed on the inner surfaces of the side walls  140   a  to  140   d  of the housing  140 , the disclosure is not limited thereto. 
     In a further embodiment, the second coil  170  may be disposed on the upper surface or the outer circumferential surface of the side walls  140   a  to  140   d  of the housing  140 . 
     Since the second coil  170  is disposed on the upper surface or the side walls  140   a  to  140   d  of the housing  140 , the second coil  170  may be disposed at higher level than the first coil  120 , which is mounted on the outer circumferential surface of the bobbin  110 . 
     Since the second coil  170  is disposed on the upper surface of the housing  140  or the upper ends of the side walls  140   a  to  140   d , it is possible to increase the distance between the second coil  170  and the image sensor of the camera module compared to the embodiment shown in  FIG.  8   . In the embodiment shown in  FIG.  9   , since the distance between the second coil  170  and the image sensor of the camera module is increased, it is possible to suppress the transmission of PWM noise to the image sensor. Accordingly, the blocking member  180  shown in  FIG.  8    may be omitted in the case where the second coil  170  is disposed on the upper surface of the housing  140  or the upper end of the side walls  140   a  to  140   d.    
     The second coil  170  may overlap the first coil  120  in the first direction. The distance between the vertical line and the first coil  120  may be the same as the distance between the vertical line and the second coil  170 . Here, the vertical line may be a line that is parallel to the optical axis or is parallel to the first direction, which is parallel to the optical axis and which extends through the center of the second coil  170 , the center of the bobbin  110  and/or the center of the housing  140 . 
     In another embodiment, the distance between the vertical line and the first coil  120  may be longer than the distance between the vertical line and the second coil  170 . 
     In a further embodiment, the distance between the vertical line and the first coil  120  may be shorter than the distance between the vertical line and the second coil  170 . 
       FIG.  10    illustrates the conductive connection between the second coil  170   a  and the first and second upper elastic members  150   a  and  150   b , shown in  FIG.  9   . 
     Referring to  FIG.  10   , one end of the second coil  170   a  (for example, the starting end of the second coil  170   a ) may be conductively connected to the first inner connector R 1  of the first upper elastic member  150   a . The other end of the second coil  170   a  (for example, the terminating end of the second coil  170   a ) may be conductively connected to the second inner connector R 2  of the second upper elastic member  150   b.    
     A conductive connection  256   a ′ may be formed between the first inner connector R 1  and the one end of the second coil  170   a , and a conductive connection  256   b ′ may be formed between the second inner connector R 2  and the other end of the second coil  170   a.    
     The conductive connection between the circuit board  250  and the first and second outer connectors Q 1  and Q 2  of the first and second upper elastic members  150   a  and  150   b  may be implemented in the same manner as the embodiment illustrated in  FIG.  7 A . 
     One end of the first coil  120  may be conductively connected to the third inner connector R 3  of the first lower elastic member  160   a , and the other end of the second coil  120  may be conductively connected to the fourth inner connector R 4  of the second lower elastic member  160   b.    
     The conductive connection between the circuit board  250  and the third and fourth outer connectors Q 3  and Q 4  of the first and second lower elastic members  160   a  and  160   b  may be implemented in the same manner as the embodiment illustrated in  FIG.  7 B . 
     With the exception of the details described with reference to  FIGS.  9  and  10   , the details described in the embodiment shown in  FIG.  1    may be equally applied to the embodiment shown in  FIGS.  9  and  10   . 
     In another embodiment, the lens moving apparatus may include the components shown in  FIG.  1    but may not include the circuit board  250 . The upper elastic member  150  may not be divided, and only the lower elastic member  160  may be divided into two segments. The base  210  may be provided with four terminal pins. Among the four terminal pins, two terminal pins may be conductively connected to the outer frames of the lower elastic members  160   a  and  160   b , and the first coil  120  may be conductively connected to the inner frames of the lower elastic members  160   a  and  160   b.    
     The remaining two terminal pins may be conductively connected to two ends of the second coil  170 . Consequently, driving power may be supplied to the first coil  120  through two of the four terminal pins provided at the base  210  and through the lower elastic members  160   a  and  160   b , and the voltage applied to the second coil  170  may be output through the remaining two of the four terminal pins. Here, all the four terminal pins may be disposed on one side of the upper surface of the base  210  or on one side surface of the base  210 . 
     Alternatively, in another embodiment, the two terminal pins connected to the lower elastic members  160   a  and  160   b  may be disposed on a first side of the upper surface of the base  210  or a first side surface of the base  210 , and the two terminal pins connected to the second coil  170  may be disposed on a second side of the upper surface of the base  210  or a second side surface of the base  210 . The first and second sides of the upper surface of the base  210  may be opposite to each other or perpendicular to each other. The first and second side surfaces of the base  210  may be opposite to each other or perpendicular to each other. 
     In a further embodiment, the lens moving apparatus may include the components shown in  FIG.  1    but may not include the circuit board  250 . The upper elastic member  150  may not be divided, and only the lower elastic member  160  may be divided into two segments. The base  210  may be provided with two terminal pins. The two terminal pins may be conductively connected to two ends of the second coil  170 . The first coil  120  may be conductively connected to the inner frames of the lower elastic members  160   a  and  160   b . The outer frame of each of the lower elastic members  160   a  and  160   b  may partially extend, and may have a bent portion functioning as a terminal pin. 
       FIG.  11    is an exploded perspective view of a lens moving apparatus  1100  according to another embodiment.  FIG.  12    is an assembled perspective view of the lens moving apparatus  1100 , from which a cover member  1300  shown in  FIG.  11    is removed.  FIG.  18    is a cross-sectional view of the lens moving apparatus, which is taken along line A-B in  FIG.  12   . 
     Referring to  FIGS.  11  and  12   , the lens moving apparatus  1100  includes a cover member  1300 , an upper elastic member  1150 , a bobbin  1110 , a first coil  1120 , a housing  1140 , a magnet  1130 , a lower elastic member  1160 , elastic support members  1220   a  to  1220   d , a second coil  1170 , a third coil  1230 , a circuit board  1250 , a base  1210  and first and second position sensors  240   a  and  240   b.    
     The description regarding the cover member  1300  shown in  FIG.  1    may be equally applied to the cover member  1300 . 
       FIG.  13    is a first perspective view of the bobbin  1110  shown in  FIG.  11   .  FIG.  14    is a second perspective view of the bobbin  1110  shown in  FIG.  11   . 
     Referring to  FIGS.  13  and  14   , the bobbin  1110  may include a bore for mounting a lens or a lens barrel, an upper support protrusion  1113  for enabling the bobbin  1110  to be coupled to the upper elastic member  1150 , and a lower support protrusion  1114  for enabling the bobbin  1110  to be coupled to the lower elastic member  1160 . 
     The bobbin  1110  may further include an upper avoidance recess  1112  for avoiding spatial interference with a connection portion  1153  of the upper elastic member  1150 , and a lower avoidance recess  1119  for avoiding spatial interference with a connection portion  1163  of the lower elastic member  1160 . 
     Although the bobbin  1110  has a shape that is different from that of the bobbin  110  shown in  FIG.  1   , the bobbin  1110  may fulfill the same function as the bobbin  110 , and the description regarding the bobbin  110  may thus be equally applied to the bobbin  1110 . 
     The first coil  1120  is disposed on the outer circumferential surface of the bobbin  1110 . A driving signal may be applied to the first coil  1120 . The description regarding the first coil  1120  shown in  FIG.  1    may be equally applied to the first coil  1120 . 
       FIG.  15    is a first perspective view illustrating the housing  1140  and the second coil  1170 , which are shown in  FIG.  11   .  FIG.  16    is a second perspective view illustrating the housing  1140  shown in  FIG.  11   . 
     Referring to  FIGS.  15  and  16   , the housing  1140  may support the magnet  1130 , and may accommodate the bobbin  1110  therein in a manner of allowing the bobbin  1110  to be moved in the first direction. 
     The housing  1140  may include an upper end portion  1710  having a bore therein, and a plurality of support portions  1720 - 1  to  1720 - 4  connected to the lower surface of the upper end portion  1710 . 
     The support portions  1720 - 1  to  1720 - 4  of the housing  1140  may be spaced apart from each other, and may be configured to have a prismatic column shape without being limited thereto. The housing  1140  may include four support portions  1720 - 1  to  1720 - 4 , and at least one pair of support portions among the support portions  1720 - 1  to  1720 - 4  may be disposed to be opposite to each other. 
     In an example, the support portions  1720 - 1  to  1720 - 4  of the housing  1140  may be disposed to correspond to the avoidance recesses  1112  and  1118  of the bobbin  1110 . In another example, the support portions  1720 - 1  to  1720 - 4  of the housing  1140  may be disposed to respectively correspond to or to be respectively aligned with four corners of the upper end portion  1710 . 
     The support portions  1720 - 1  to  1720 - 4  of the housing  1140  may be provided with respective stepped portions  1731  so as to support the magnet  1130 . 
     In order to inhibit collisions with the cover member  1300 , the housing may be provided with at least one first stopper  1143 , which protrudes from the upper surface of the housing  1140 . The first stopper  1143  of the housing  1140  may function to guide the installation position of the upper elastic member  1150 . 
     In order to inhibit collisions with the cover member  1300 , the housing  1140  may be provided with at least one second stopper  1146 , which protrudes from a side surface of the upper end portion  1710 . 
     The housing may include at least one upper frame support protrusion  1144 , which protrudes from the upper end portion  1710  for coupling to the outer frame  1152  of the upper elastic member  1150 , and at least one lower frame support protrusion  1145 , which protrudes from the lower surfaces of the support portions  1720 - 1  to  1720 - 4  for coupling to the outer frame  1162  of the lower elastic member  1160 . 
     The upper end portion  1710  of the housing  1140  may include a second coil support portion  1741 , which projects into the bore  1201  and is positioned to be lower than the upper surface by a height difference dl. The second coil  1170  may be disposed or mounted on the second coil support portion  1741 . 
     For example, the upper surface  1740  of the upper end portion  1710  of the housing  1140  may include the second coil support portion  1741  and an outer support portion  1742 , and a height difference dl in the first direction may be present between the second coil support portion  1741  and the outer support portion  1742 . 
     The outer support portion  1742  may abut the outer surface of the housing  1140 , and may be configured to have a shape corresponding to or coinciding with the outer frame  1152  of the upper elastic member  1150  so as to support the outer frame  1152  of the upper elastic member  1150 . 
     The second coil support portion  1741  may have the form of a recess or cavity, which is recessed from the outer support portion  1742 , and may be configured to have a height difference dl in the first direction with respect to the outer support portion  1742 . 
     In order to inhibit oscillation while the bobbin  1110  moves, a damper may be applied between the second coil support portion  1741  and the connection portion  1153  of the upper elastic member  1150 . 
     The housing  1140  may have slots  1751  formed in the corners of the side surfaces of the upper end portion  1710  so as to allow the elastic support members  1220   a  to  1220   d  to extend through the slots  1751 . 
     The slots  1751  of the housing may be configured to have the form of a groove, which is recessed in the second and/or third direction from the corners of the side surfaces, without being limited thereto. In another embodiment, the slots  1751  may be configured to have the form of a hole, which is formed from the upper surface to the lower surface of the upper end portion  1710  of the housing  1140 . 
     Although the depth of the slots  1751  in the housing  1140  may be greater than the thickness of the elastic support members  1220   a  to  1220   d , the disclosure is not limited thereto. The slots  1751  of the housing  1140  may function to guide or support the elastic support members  1220   a  to  1220   d.    
     The second coil  1170  may be placed on the upper surface of the housing  1400 . For example, the second coil  1170  may be disposed, seated or mounted on the second coil support portion  1741  of the upper end portion  1710  of the housing  1140 . 
     The second coil  1170  may fulfill the same function as the second coil  170  shown in  FIG.  1   , and the description regarding the second coil  170  shown in  FIG.  1    may be equally applied to the second coil  1170 . 
     The second coil  1170  may overlap the first coil  1120  in the first direction. The distance between the vertical line and the first coil  1120  may be the same as the distance between the vertical line and the second coil  1170 . Here, the vertical line may be a line that is parallel to the optical axis or is parallel to the first direction, which is parallel to the optical axis, and may extend through the center of the second coil  1170 , the center of the bobbin  1110  and/or the center of the housing  1140 . 
     In another embodiment, the distance between the vertical line and the first coil  1120  may be longer than the distance between the vertical line and the second coil  1170 . 
     In a further embodiment, the distance between the vertical line and the first coil  1120  may be shorter than the distance between the vertical line and the second coil  1170 . 
     The magnet  1130  may be disposed on the outer circumferential surface of the housing  1140  so as to correspond to or to be aligned with the first coil  1120 . For example, the magnet  1130  may be disposed on the support portions  1720 - 1  to  1720 - 4  of the housing  1140  using adhesive or double-sided adhesive tape. 
     The magnet  1130  may fulfill the same function as the magnet  130  shown in  FIG.  1   , and the description regarding the magnet  130  shown in  FIG.  1    may be equally applied to the magnet  1130 . 
       FIG.  17    is a perspective view illustrating the upper elastic member  1150  and the lower elastic member  1160 , which are shown in  FIG.  11   . 
     Referring to  FIG.  17   , each of the upper elastic member  1150  and the lower elastic member  1160  may be divided into two or more segments. 
     For example, the upper elastic member  1150  may include first and second upper elastic members  1150   a  and  1150   b , which are conductively separated from each other, and the lower elastic member  1160  may include first and second lower elastic members  1160   a  and  1160   b.    
     Each of the first and second upper elastic members  1150   a  and  1150   b  and each of the first and second lower elastic members  1160   a  and  1160   b  may include inner frames  1151  and  1161  coupled to the bobbin  1110 , outer frames  1152  and  1162  coupled to the housing  1140 , and connection portions  1153  and  1163  connecting the inner frames  1151  and  1161  to the outer frames  1152  and  1162 . 
     The inner frame  1151  of the upper elastic member  1150  may be provided with a bent portion  1151   a , which is fitted over the upper support protrusion  1113  of the bobbin  1110 . 
     The outer frame  1152  of the upper elastic member  1150  may be provided with a first through hole  1152   a , which is coupled to the upper frame support protrusion  1144  of the housing  1140 . The outer frame  1152  of the upper elastic member  1150  may be provided with a first guide hole  1153 , which is coupled to the first stopper  1143  of the housing  1140 . 
     The inner frame  1161  of the lower elastic member  1160  may be provided with a third through hole  1161   a , which is coupled to the lower support protrusion of the bobbin  1110 . The outer frame  1162  of the lower elastic member  1160  may be provided with an insertion cutout  1162   a , which is coupled to the lower frame support protrusion  1145  of the housing  1140 . 
     The upper elastic member  1150  may be conductively connected to the second coil  1170 . 
     One end of the second coil  1170  (for example, the starting end of the second coil  1170 ) may be conductively connected to the first upper elastic member  1150   a  through soldering or thermal fusion, and the other end of the second coil  1170  (for example, the terminating end of the second coil  1170 ) may be conductively connected to the second upper elastic member  1150   b  through soldering or thermal fusion. 
     The inner frame  1151  of the first upper elastic member  1150   a  may include a first inner connector S 1 , and the inner frame  1151  of the second upper elastic member  1150   b  may include a second inner connector S 2 . 
     One end of the second coil  1170  may be conductively connected to the first inner connector S 1  of the first upper elastic member  1150   a , and the other end of the second coil  1170  may be conductively connected to the second inner connector S 2  of the second upper elastic member  1150   b.    
     The upper elastic member  1150  may be conductively connected to the circuit board  1250  via the elastic support portions  1220   a  to  1220   d.    
     One end of at least one of the elastic support members  1220   a  to  1220   d  may be conductively connected to the outer frame  1152  of the first upper elastic member  1150   a , and the other end of the at least one of the elastic support members  1220   a  to  1220   d  may be conductively connected to a corresponding one of the terminals provided on the terminal surface  1250   a  of the circuit board  1250 . 
     One end of at least another one of the elastic support members  1220   a  to  1220   d  may be conductively connected to the outer frame  1152  of the second upper elastic member  1150   b , and the other end of the at least another one thereof may be conductively connected to a corresponding one of the terminals provided on the terminal surface  1250   a  of the circuit board  1250 . 
     The lower elastic member  1160  may be conductively connected to the first coil  1120 . 
     One end of the first coil  1120  (for example, the starting end of the first coil  1120 ) may be conductively connected to the first lower elastic member  1160   a  through soldering or thermal fusion, and the other end of the first coil  1120  (for example, the terminating end of the first coil  1120 ) may be conductively connected to the second lower elastic member  1160   b  through soldering or thermal fusion. 
     The inner frame  1161  of the first lower elastic member  1160   a  may include a third inner connector S 3 , and the inner frame  1161  of the second lower elastic member  1160   b  may include a fourth inner connector S 4 . 
     One end of the first coil  1120  may be conductively connected to the third inner connector S 3  of the first lower elastic member  1160   a , and the other end of the first coil  1120  may be conductively connected to the fourth inner connector S 4  of the second lower elastic member  1160   b.    
     The lower elastic member  1160  may be conductively connected to the circuit board  1250 . For example, the outer frames  1162  of the first and second lower elastic members  1160   a  and  1160   b  may include pad portions  1165   a  and  1165   b.    
     Each of the pad portions  1165   a  and  1165   b  of the first and second lower elastic members  1160   a  and  1160   b  may be conductively connected to a corresponding one of the terminals provided on the terminal surface  1250   a  of the circuit board  1250 . 
     A driving signal may be supplied to the first coil  1120  from the circuit board  250  through the first and second lower elastic members  1160   a  and  1160   b . Here, the driving signal may be the same as the driving signal applied to the first coil  120  shown in  FIG.  1   . 
     A voltage, which is induced to the second coil  1170 , may be supplied to the circuit board  1250  through the first and second upper elastic members  1150   a  and  1150   b  and two selected from among the elastic support members  220  to  220   d.    
     In another embodiment, the lower elastic member  1160  may not be divided, but the upper elastic member  1150  may be divided into four segments. Accordingly, a driving signal may be supplied to the first coil  1120  from the circuit board  1250  through two selected from among the four divided upper elastic members and two selected from among the elastic support members  220   a  to  220   d . A voltage, which is induced to the second coil  1170 , may be supplied to the circuit board  1250  through the remaining two of the four divided upper elastic members and the remaining two of the elastic support members  220   a  to  220   d.    
       FIG.  19    is an exploded perspective view illustrating the base  1210 , the circuit board  1250 , the third coil  1230  and the first and second position sensors  1240   a  and  1240   b , which are shown in  FIG.  11   . 
     Referring to  FIG.  19   , the base  1210  may include a mounting groove  1213 , which is recessed from the upper surface of the base  1210  and to which the lower frame support protrusions  1145  of the support portions  1720 - 1  to  1720 - 4  of the housing  1140  are fitted or secured. 
     The base  1210  may include a terminal surface support recess  1210   a , which is recessed inward from the side surface thereof by a predetermined depth and has a shape corresponding to the terminal surface  1250   a  of the circuit board  1250 , so as to support the terminal surface  1250   a  of the circuit board  1250 . 
     Furthermore, the base  1210  may include a first position sensor mounting recess  1215   a , which is recessed from the upper surface thereof and in which the position sensor  1240   a  is disposed, and a second position sensor mounting recess  1215   b , which is recessed from the upper surface thereof and in which the second position sensor  1240   b  is disposed. For example, an angle defined between the imaginary lines, which are connected from the centers of the first and second position sensor mounting recesses  1215   a  and  1215   b  to the center of the base  1210 , may be an angle of 90°. 
     The base  1210  may include a flange  1210   b  protruding from a lower portion of the outer circumferential surface thereof. The base  1210  may include a coupling protrusion  1212   a , which protrudes from the upper surface of the base  1210  so as to secure the circuit board  1250 . 
     The first and second position sensors  1240   a  and  1240   b  may be disposed in the position sensor mounting recesses  1215   a  and  1215   b  of the base  1210 , which is positioned under the circuit board  1250 . 
     When the housing  1140  moves in the second and/or third direction, the first and second position sensors  1240   a  and  1240   b  may detect variation in magnetic force generated from the magnet  1130 . 
     For example, the first and second position sensors  1240   a  and  1240   b  may be embodied as a Hall sensor alone or as a driver including a Hall sensor. However, this is merely an illustrative example, and the position sensors may be embodied as any sensor as long as it is able to detect a position without using magnetic force. 
     The first and second position sensors  1240   a  and  1240   b  may be conductively connected to the circuit board  1250  through soldering, thermal fusion or the like. 
     The third coil  1230  may be disposed on the upper surface of the circuit board  1250 , and the position sensors  1240   a  and  1240   b  may be disposed on the lower surface of the circuit board  1250 . 
     The circuit board  1250  may be disposed on the upper surface of the base  1210 , and may have a bore, which corresponds to the bore of the bobbin  1110 , the bore of the housing  1140  and/or the bore of the base  1210 . 
     The circuit board  1250  may include at least one terminal surface  1250   a , which is bent from the upper surface thereof and which includes a plurality of terminals or pins for receiving electrical signals from the outside or supplying electrical signals to the outside. 
     The circuit board  1250  may have a fifth through hole  1251 , which is coupled to the coupling protrusion  1212   a  of the base  1210 . Furthermore, the circuit board  1250  may include pads  1252   a  to  1252   d  to which the other ends of the elastic support members  1120   a  to  1220   d  are connected. The pads  1252   a  to  1252   d  may be conductively connected to the plurality of terminals provided on the terminal surfaces  1250   a  via a wiring pattern formed on the circuit board  1250 . 
     The terminals of the circuit board  1250  may be conductively connected to the outer frame  1152  of the first and second upper elastic member  1150   a  and  1150   b  via the elastic support members  1220   a  to  1220   d.    
     The circuit board  1250  may be a flexible printed circuit board (FPCB), without being limited thereto. The terminals of the circuit board  1250  may also be formed on a surface of a PCB or the base  1210  in a manner of forming a surface electrode. 
     The circuit board  1250  may include at least one terminal or pad  1253 , to which the starting or terminating end of the third coil  1230  is conductively connected. 
     For example, the circuit board  1250  may include first terminals, to which the starting ends of second-direction third coils  1230   a  and  1230   b  are conductively connected, second terminals, to which the terminating ends of second-direction third coils  1230   a  and  1230   b  are conductively connected, third terminals, to which the starting ends of third-direction third coils  1230   c  and  1230   d  are conductively connected, and fourth terminals, to which the terminating ends of third-direction third coils  1230   c  and  1230   d  are conductively connected. 
     The third coil  1230  is disposed on the upper surface of the circuit board  1250  so as to correspond to or to be aligned with the magnet  130 . The number of third coils  1230  may be one or more, and may be the same as the number of magnets  1130 , without being limited thereto. 
     Although  FIG.  19    illustrates four third coils  1230   a  to  1230   d , which are disposed on the upper surface of the circuit board  1250  so as to be spaced apart from each other, the disclosure is not limited thereto. In another embodiment, the third coil may be embodied as a coil formed on an additional circuit board, rather than on the circuit board  1250 . 
     For example, the third coil  1230  may include second-direction third coils  1230   a  and  1230   b , which are arranged so as to be parallel to the second direction, and third-direction third coils  1230   c  and  1230   d , which are arranged so as to be parallel to the third direction. 
     As described above, the third coil may be conductively connected to the circuit board  1250 . 
     A driving signal is supplied to the third coil  1230 , and the housing  1140  is able to be moved in the second and/or third direction, that is, in the x-axis and/or y-axis direction, by the electromagnetic force resulting from the electromagnetic interaction between the magnet  1130  and the third coil  1230 , which are disposed so as to be opposite to or aligned with each other. Handshake correction may be implemented by controlling the movement of the housing  1140 . 
     At least one of the elastic support members  1220   a  to  1220   d  conductively connects the upper elastic member  1150  to the circuit board  1250 . 
     For example, one end of each of two selected from among the elastic support members  1220   a  to  1220   d  may be conductively connected to the outer frame of a corresponding one of the first and second upper elastic members  1150   a  and  1150   b.    
     Referring to  FIG.  12   , there are shown connected portions  11   a  to  11   d , at which first ends of the elastic support members  1220   a  to  1220   d  are connected to the outer frames  1152  of the first and second upper elastic members  1150   a  and  1150   b.    
     The other end of each of the two selected elastic support members may be conductively connected to a corresponding one of the pads  1252   a  to  1252   d  of the circuit board  1250 . 
     The elastic support members  1220   a  to  1220   d  may be disposed radially symmetrically with respect to the center of the housing  1140  in the second and/or third direction, which are perpendicular to the first direction. The elastic support members  1220   a  to  1220   d  may serve as a signal channel between the circuit board  250  and the upper elastic member  1150 , through which electrical signals are transmitted, and may elastically support the housing  1140  with respect to the base  1210 . 
     The elastic support members  1220   a  to  1220   d  may be constituted separately from the upper elastic member  1150 , and may be embodied as a member capable of elastically supporting an object, such as a leaf spring, a coil spring, a suspension wire or the like. In another embodiment, the elastic support members  1220   a  to  1220   d  may be integrally formed with the upper elastic member  1150 . 
     Referring to  FIG.  18   , the second coil  1170  may be positioned between the first coil  1120  and the upper elastic members  1150   a  and  1150   b.    
     In response to a driving signal, the first coil  1120  is able to move in the first direction together with the bobbin  1110  by the electromagnetic force resulting from the electromagnetic interaction between the magnet  1130  and the current flowing through the first coil  1120 . Here, the driving signal may be the same as that described with reference to  FIGS.  20 A and  20 B . 
     As the first coil  1120  moves in the first direction, the distance D 2  between the first coil  1120  and the second coil  1170  varies. With the variation of the distance D 2 , a voltage may be induced to the second coil  1170 . Here, the magnitude of voltage, which is induced to the second coil  1170 , may be determined depending on the distance D 2 . 
     For example, the voltage induced to the second coil  1170  may increase with the decrease of the distance D 2 . In contrast, the voltage induced to the second coil  1170  may decrease with the increase of the distance D 2 . 
     In this way, displacement of the bobbin  1110  may be detected by the magnitude of voltage induced to the second coil  1170 . The auto-focusing in the first direction of the bobbin  1110  may be feedback-controlled using the detected displacement of the bobbin  1110 . 
     Generally, since there is a necessity for a position sensor capable of detecting the displacement of a movable AF unit in order to perform AF feedback control, and since there is a necessity for an additional power connecting structure in order to drive the position sensor, the cost of the lens moving apparatus may increase, and difficulties in manufacturing may arise. The movable AF unit may include the bobbin  110  or  1110 , and components, which are mounted on the bobbin  110  or  1110  and are moved along with the bobbin  110  or  1110 . For example, the movable AF unit may include the bobbin  110  or  1110 , the first coil  120  or  1120  and a lens (not shown) mounted on the bobbin  110  or  1110 . 
     The linear range (hereinafter, referred to as a “first linear range”) in a graph exhibiting the relationship between the distance by which the bobbin moves and the magnetic flux of the magnet detected by the position sensor, may be restricted by the positional relationship between the magnet and the position sensor. 
     In contrast, the embodiment makes it possible to detect displacement of the bobbin  110  or  1110  based on the voltage induced to the second coil  170  or  1170  by the interaction between the first coil  120  or  1120  and the second coil  170  or  1170 , and makes it possible to execute AF feedback control in the first direction of the bobbin  110  or  1110  using the detected displacement of the bobbin  1110 . In other words, it is possible to control the driving signal supplied to the first coil  120  or  1120  based on the voltage induced to the second coil  170  or  1170 . 
     Accordingly, since there is no necessity for an additional position sensor for detecting displacement of the bobbin  1110 , the embodiment makes it possible to reduce the cost of the lens moving apparatus and to facilitate the manufacturing operation. 
     Furthermore, since the inductive interaction between the first coil  120  or  1120  and the second coil  170  or  1170  is employed, the linear range in a graph plotted between the moving distance by which the bobbin  110  or  1110  moves and an induction voltage caused by inductive interaction may be increased compared to the above-described first linear range. Consequently, the embodiment makes it possible to assure linearity over a wider range, to decrease the defect rate, and to perform more accurate AF feedback control. 
       FIG.  21    is an exploded perspective view illustrating a camera module according to an embodiment. 
     Referring to  FIG.  21   , the camera module may include a lens barrel  400 , a lens moving apparatus, a filter  610 , an image sensor  810 , a sensor  820 , a controller  830  and a connector  840 . 
     The camera module may further include an adhesive member  710 , a first holder  600  and a second holder  800 . 
     The lens barrel  400  may be mounted in the bobbin  110  of the lens moving apparatus  450 . The lens moving apparatus  450  may be the lens moving apparatus  100  shown in  FIG.  1    or the lens moving apparatus shown in  FIG.  11   . 
     The first holder  600  may be located under the base  210  or  1210  of the lens moving apparatus  450 . The filter  610  may be mounted on the first holder  600 , and the first holder  600  may have a raised portion  500  on which the filter  610  is seated. 
     The adhesive member  710  may couple or attach the base  210  or  1210  of the lens moving apparatus  450  to the first holder  600 . In addition to the attachment function described above, the adhesive member  710  may serve to inhibit contaminants from entering the lens moving apparatus  450 . 
     For example, the adhesive member  710  may be, for example, epoxy, thermohardening adhesive, or ultraviolet hardening adhesive. 
     The filter  610  may serve to inhibit light within a specific frequency band that has passed through the lens barrel  400  from being introduced into the image sensor  810 . The filter  610  may be an infrared-light blocking filter, without being limited thereto. Here, the filter  610  may be disposed parallel to the x-y plane. 
     The region of the first holder  600  in which the filter  610  is mounted may be provided with a bore to allow the light that passes through the filter  610  to be introduced into the image sensor  810 . 
     The second holder  800  may be disposed under the first holder  600 , and the image sensor  810  may be mounted on the second holder  600 . The light, having passed through the filter  610 , is introduced into the image sensor  810  so as to form an image on the image sensor  810 . 
     The second holder  800  may include, for example, various circuits, devices, and a controller in order to convert the image, formed on the image sensor  810 , into electrical signals to thereby transmit the same to an external apparatus. 
     The second holder  800  may be embodied as a circuit board on which the image sensor  810  is mounted, on which a circuit pattern is formed, and to which various devices are coupled. 
     The image sensor  810  may receive an image included in the light introduced through the lens moving apparatus  450 , and may convert the received image into electrical signals. 
     The filter  610  and the image sensor  810  may be spaced apart from each other so as to be opposite to each other in the first direction. 
     The sensor  820  may be mounted on the second holder  800 , and may be conductively connected to the handshake controller  830  through the circuit pattern formed on the second holder  800 . 
     The sensor  820  may be a device for detecting the movement of the camera module  200 . For example, the sensor  820  may be a motion sensor, a dual-axis or triple-axis gyro sensor, an angular speed sensor, an acceleration sensor or a gravity sensor. 
     The controller  830  may include at least one of an AF feedback controller for AF feedback driving and an OIS feedback controller for performing OIS feedback control. 
     The controller  830  may be mounted on the second holder  800 . 
     The AF feedback controller may be conductively connected to the first coil  120  or  1120  and the second coil  170  or  1170  of the lens moving apparatus  450 . The AF feedback controller may control a driving signal supplied to the first coil  120  or  1120 , based on the induction voltage induced to the second coil  170  or  1170 . 
     The OIS feedback controller may be conductively connected to the position sensors  240   a  and  240   b  and the third coils  1230   a  to  1230   d . The OIS feedback controller may control a signal supplied to the third coils  1230   a  to  1230   d , based on signals supplied to the position sensors  240   a  and  240   b.    
     The connector  840  may have a port for the electrical connection of the second holder  800  and the electrical connection of an external apparatus. 
       FIG.  22    is a perspective view illustrating a lens moving apparatus according to a further embodiment.  FIG.  23    is an exploded perspective view illustrating the lens moving apparatus according to the further embodiment. 
     A handshake correction apparatus, which is applied to compact camera modules of mobile devices such as smart phones or tablet PCs, is an apparatus configured to inhibit the contour of an image, captured when taking a still image, from being unclearly formed due to vibrations caused by the trembling of the user&#39;s hand. 
     In addition, an auto-focusing apparatus is configured to automatically focus the subject image on the surface of an image sensor (not shown). The handshake correction apparatus and the auto-focusing apparatus may be configured in various manners. In the embodiments, the lens moving apparatus may perform the handshake correction and/or auto-focusing operations in such a manner as to move an optical module, composed of a plurality of lenses, in a first direction or in a plane perpendicular to the first direction. 
     As illustrated in  FIGS.  22  and  23   , the lens moving apparatus according to the embodiment may include a movable unit. Here, the movable unit may perform auto-focusing and handshake correction. The movable unit may include a bobbin  11000 , a first coil  12000 , a magnet  13000 , a housing  14000 , an upper elastic member  15000 , and a lower elastic member  16000 . 
     The bobbin  11000  may be provided inside the housing  14000 , and may be provided on the outer circumferential surface thereof with the first coil  12000 , which is located inside the magnet  13000  so as to face the magnet  13000 . 
     The first coil  12000  may be installed in the inner space of the housing  14000  so as to be reciprocally movable in the first direction via electromagnetic interaction between the magnet  13000  and the first coil  12000 . Specifically, the first coil  12000  may be movable upward and downward with respect to the initial position, at which the first coil  12000  is positioned, when current is not applied to the first coil  12000 . The first coil  12000  may be installed on the outer circumferential surface of the bobbin  11000  so as to electromagnetically interact with the magnet  13000 . 
     In addition, the bobbin  11000  may be elastically supported by the upper and lower elastic members  15000  and  16000 , thereby performing auto-focusing by moving in the first direction. 
     The bobbin  11000  may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel may be coupled in various manners within the bobbin  11000 . 
     For example, a female threaded portion may be formed on the inner circumferential surface of the bobbin  11000 , and a male threaded portion may be formed on the outer circumferential surface of the lens barrel so as to correspond to the female threaded portion. The lens barrel may be coupled to the bobbin  11000  by virtue of the threaded engagement therebetween. 
     However, the disclosure is not limited thereto, and instead of forming the threaded portion on the inner circumferential surface of the bobbin  11000 , the lens barrel may be directly secured inside the bobbin  11000  by other ways excluding the threaded engagement. Alternatively, one or more lenses may be integrally formed with the bobbin  11000 , without incorporating the lens barrel. 
     The lens coupled to the lens barrel may be constituted by a single lens, or two or more lenses may configure an optical system. Auto-focusing may be controlled in accordance with the direction of current, and may be implemented by movement in the first direction of the bobbin  11000 . 
     For example, the bobbin  11000  may move upward from the initial position thereof when forward current is applied, and the bobbin  11000  may move downward from the initial position thereof when reverse current is applied. Alternatively, the distance by which the bobbin  11000  moves in one direction may be increased or reduced by adjusting the quantity of current in one direction. 
     The bobbin  11000  may be provided on the upper surface and the lower surface thereof with a plurality of upper support protrusions and lower support protrusions. The upper support protrusions may be configured to have a cylindrical or prismatic shape, and may serve to couple and secure the upper elastic member  15000 . The lower support protrusions may be configured to have a cylindrical or prismatic shape, and may serve to couple and secure the lower elastic member  16000 , like the upper support protrusions. 
     The lens moving apparatus according to the embodiment may include a first sensor capable of detecting displacement of the bobbin  11000  while the bobbin  11000  moves in the first direction. In the embodiment, a second coil  26000  may serve as the first sensor, which will be described in detail later. 
     The upper elastic member  15000  may be provided on the bobbin  11000 , and the lower elastic member  16000  may be provided under the bobbin  11000 . Here, the upper elastic member  15000  may have through holes corresponding to the upper support protrusions, and the lower elastic member  16000  may have through holes corresponding to the lower support protrusions. The support protrusions and the through holes may be securely coupled to each other via thermal fusion bonding or an adhesive such as, for example, epoxy. 
     The housing  14000  may take the form of a hollow column to support the magnet  13000 , and may have an approximately square shape. The magnet  13000  and the support member  22000  may be coupled respectively to the side surface portions of the housing  14000 . In addition, as described above, the bobbin  11000  may be provided inside the housing  14000  so as to move in the first direction by being guided by the elastic members  15000  and  16000 . 
     The upper elastic member  15000  and the lower elastic member  16000  may be coupled to the housing  14000  and the bobbin  11000 , and may elastically support the upward and/or downward movement of the bobbin  11000  in the first direction. The upper elastic member  15000  and the lower elastic member  16000  may be embodied as leaf springs. 
     As shown in  FIG.  23   , the upper elastic member  15000  may include a plurality of upper elastic member segments, which are separated from each other. By virtue of this multi-segmented configuration, the respective segments of the upper elastic member  15000  may receive current of different polarities or different powers. In addition, the lower elastic member  16000  may also be divided into a plurality of lower elastic member segments, and may be conductively connected to the upper elastic member  15000 . 
     Meanwhile, the upper elastic member  15000 , the lower elastic member  16000 , the bobbin  11000 , and the housing  14000  may be assembled with one another via thermal fusion bonding, an adhesive or the like. 
     The base  21000  may be disposed below the bobbin  11000 , and may have an approximately square shape. A circuit board  25000  may be placed or seated on the base  21000 . 
     The surface of the base  21000  that faces the portion of the circuit board  25000  on which the terminal surface  25300  is provided may be provided with a support recess, which is sized to correspond to the terminal surface  25300 . The support recess may be indented to a given depth from the outer circumferential surface of the base  21000 , so as to inhibit the portion provided with the terminal surface  25300  from protruding outward, or to adjust the distance by which the portion provided with the terminal surface  25300  protrudes. 
     The support member  22000  may be disposed at the side surface of the housing  14000  so as to be spaced apart from the housing  14000 , and may be coupled at the upper end thereof to the upper elastic member  15000  and at the lower end thereof to the base  21000 , the circuit board  25000  or the circuit member  23100 . The support member  22000  may support the bobbin  11000  and the housing  14000  so that the bobbin  11000  and the housing  14000  are movable in the second direction and the third direction, which are perpendicular to the first direction. In addition, the support member  22000  may be conductively connected to the first coil  12000 . 
     One support member  22000  according to the embodiment is located at each outer surface of the corners of the housing  14000 , and therefore a total of four support members may be symmetrically arranged. In addition, the support member  22000  may be conductively connected to the upper elastic member  15000 . For example, the support member  22000  may be conductively connected to the portion of the upper elastic member  15000  in which the through holes are formed. 
     In addition, because the support member  22000  is formed separately from the upper elastic member  15000 , the support member  22000  and the upper elastic member  15000  may be conductively connected to each other using, for example, a conductive adhesive or solder. Accordingly, the upper elastic member  15000  may apply current to the first coil  12000  through the support member  22000  conductively connected thereto. 
     The support member  22000  may be connected to the circuit board  25000  through the through hole formed in the circuit member  23100  and the circuit board  25000 . Alternatively, the support member  22000  may be conductively connected to the corresponding portion of the circuit member  23100  by soldering, without forming the through hole in the circuit member  23100  and/or the circuit board  25000 . 
     Meanwhile, although  FIG.  23    illustrates a linear support member  22000  according to one embodiment, the disclosure is not limited thereto. That is, the support member  22000  may take the form of a plate member or the like. 
     The third coil  23000  may perform handshake correction by moving the housing  14000  in the second direction and/or the third direction via electromagnetic interaction with the magnet  13000 . 
     Here, the second direction and the third direction may include not only the x-axis direction (or the first direction) and the y-axis direction (or the second direction), but also directions that are substantially close to the x-axis and y-axis directions. 
     In the embodiment, although the housing  14000  may move parallel to the x-axis and the y-axis in terms of driving, the housing  14000  may also move slightly obliquely relative to the x-axis and the y-axis when moved while being supported by the support member  22000 . Accordingly, it is necessary to install the magnet  13000  at a position corresponding to the third coil  23000 . 
     The third coil  23000  may be disposed so as to be opposite to the magnet  13000  fixed to the housing  14000 . In one embodiment, the third coil  23000  may be disposed under the magnet  13000  so as to be spaced apart from the magnet  13000  by a predetermined distance. Alternatively, the third coil  23000  may be disposed outside the magnet  13000 . 
     According to the embodiment, a total of four second coils  23000  may be installed on four corners of a circuit member  23100 , without being limited thereto. Alternatively, only two second coils, including one second-direction second coil and one third-direction second coil, may be disposed, or four or more second coils may be disposed. 
     Alternatively, a total of six second coils including one second-direction second coil disposed at the first side of the circuit member  23100 , two second-direction second coils disposed at the second side, one third-direction second coil disposed at the third side, and two third-direction second coils disposed at the fourth side may also be disposed. In this case, the first side may be positioned adjacent to the fourth side, and the second side may be positioned adjacent to the third side. 
     In the embodiment, a circuit pattern may be formed in the third coil  23000  on the circuit member  23100 , or an additional second coil may be disposed above the circuit member  23100 , without being limited thereto. Alternatively, a circuit pattern may be directly formed in the third coil  23000  on the circuit member  23100 . 
     Alternatively, the third coil  23000  may be formed by winding a wire in a donut shape, or may be configured as an FP coil, so as to be conductively connected to the circuit board  25000 . 
     The circuit member  23100  including the third coil  23000  may be installed or disposed on the upper surface of the circuit board  25000 , which is disposed above the base  21000 . However, the disclosure is not limited thereto, and the third coil  23000  may come into close contact with the base  21000 , or may be spaced apart from the base  21000  by a predetermined distance. The third coil  23000  may be formed on a separate board, and in turn the board may be stacked on and connected to the circuit board  25000 . 
     The circuit board  25000  may be conductively connected to at least one of the upper elastic member  15000  and the lower elastic member  16000 . The circuit board  25000  may be disposed under the third coil  23000 , and may be coupled to the upper surface of the base  21000 . As illustrated in  FIG.  23   , the circuit board  25000  may have a through hole formed at a position corresponding to one end of the support member  22000 , so as to allow the support member  22000  to extend therethrough. Alternatively, the circuit board  25000  may be conductively connected and/or bonded to the support member  22000 , without forming the through hole. 
     The circuit board  25000  may have a plurality of terminals  25100 , which are disposed or formed thereon. The terminals  25100  may be disposed on a bent terminal surface  25300 . The plurality of terminals  25100  may be disposed on the terminal surface  25300 , and may receive external power so as to supply current to the first coil  12000  and/or the third coil  23000 . 
     The number of terminals formed on the terminal surface  25300  may be increased or reduced in accordance with the kind of components, which are required to be controlled. In addition, the circuit board  25000  may have one terminal surface  25300 , or may have two or more terminal surfaces  25300 . 
     A cover member  30000  may be configured to have a boxlike shape so as to accommodate, for example, the movable unit, the third coil  23000 , and a portion of the circuit board  25000 , and may be coupled to the base  21000 . 
     The cover member  30000  may protect, for example, the movable unit, the third coil  23000 , and the circuit board  25000  accommodated therein so as to inhibit the components from being damaged. In addition, the cover member  1300  may restrict the range of motion of the movable unit accommodated therein. 
       FIG.  24    is an exploded perspective view illustrating the base  21000 , the circuit board  25000  and the third coil  23000  according to the embodiment. The lens moving apparatus may further include a second sensor  24000 . 
     The second sensor  24000  is disposed at the center of the third coil  23000  so as to detect movement of the housing  14000 . Here, the second sensor  24000  may detect movement in the second and/or third direction of the housing  14000 . 
     The second sensor  24000  may be embodied as a Hall sensor or the like, and may be embodied as any sensor as long as the sensor is able to detect variation in magnetic force. As illustrated in  FIG.  24   , the second sensor  24000  may include a total of two second sensors, which are installed at side portions of the base  21000 , which is disposed under the circuit board  25000 , and the second sensors  24000  may be fitted into second sensor mounting grooves  21500  formed in the base  21000 . The lower surface of the circuit board  25000  may be the surface opposite to the surface on which the third coil  23000  is disposed. 
     The second sensor  24000  may be disposed under the third coil  23000  so as to be spaced apart from the third coil  23000  with the circuit board  25000  interposed therebetween. Specifically, the third coil  23000  may be disposed on the circuit board  25000 , and the second sensor  24000  may be disposed on the lower surface of the circuit board  25000 , without the second sensor  24000  being directly connected to the third coil  23000 . 
       FIG.  25    is a perspective view illustrating the lens moving apparatus according to the further embodiment, from which the cover member  30000  is removed.  FIG.  26    is a plan view of  FIG.  25   .  FIG.  27    is a cross-sectional view of  FIG.  25   . 
     The lens moving apparatus according to the embodiment may include the second coil  26000 . The second coil  26000  may function to detect displacement of the bobbin  11000  when the bobbin  11000  moves in the first direction for auto-focusing. 
     The second coil  26000  may be provided outside the housing  14000 . As the bobbin  11000  moves in the first direction, the second coil  26000  may generate electromotive force resulting from the inductive interaction between the second coil  26000  and the first coil  12000 . 
     Accordingly, the lens moving apparatus according to the embodiment may detect displacement in the first direction of the bobbin  11000  by measuring variation in the voltage of the electromotive force generated from the second coil  26000 . 
     A driving signal, that is, power and current, may be applied to the first coil  12000  such that the bobbin  11000  is movable in the first direction by the electromagnetic interaction between the first coil  12000  and the magnet  13000 . The driving signal may be an AC signal. 
     The AC signal may be a sine wave signal or a pulse signal. Specifically, in the case of the pulse signal, the AC signal may be a DC signal or a pulse width modulation (PWM) signal. The application of an AC signal to the first coil  12000  is intended to induce electromotive force to the second coil  26000  by the inductive interaction. 
     With the application of the driving signal, current may flow through the first coil  12000 . Electromagnetic interaction occurs between the current flowing through the first coil  12000  and the magnet  13000 , and the first coil  12000  is movable upward and downward in the first direction along with the bobbin  11000  owing to the resulting electromagnetic force. 
     As the first coil  12000  moves in the first direction, the distance in the first direction between the first coil  12000  and the second coil  26000  varies. Owing to the variation in the distance, electromotive force, current and voltage are induced to the second coil  26000  by the inductive interaction. 
     Specifically, as the distance in the first direction therebetween decreases, the electromotive force, current and voltage, which are induced to the second coil  26000 , may increase. In contrast, as the distance in the first direction therebetween increases, the electromotive force, current and voltage, which are induced to the second coil  26000 , may decrease. 
     Accordingly, the embodiment is able to detect displacement of the first coil  12000  based on the magnitude of the voltage induced to the second coil  26000 . As a result, it is possible to detect displacement in the first direction of the bobbin  11000  based on the detected displacement of the first coil  12000 . 
     Consequently, the lens moving apparatus according to the embodiment is able to perform an auto-focusing function by controlling a driving signal, that is, the magnitude of current applied to the first coil  12000  and in turn controlling the position of the bobbin  11000  in the first direction. 
     As illustrated in  FIGS.  25  to  27   , the housing  14000  may be configured to have a polygonal shape when viewed in the first direction, and the second coil  26000  may be configured to surround the outer side surface of the housing  14000 . 
     In the embodiment, although the housing  14000  is configured to have a rectangular shape when viewed in the first direction, it may also be configured to have a polygonal shape having five or more corners. In another embodiment, the second coil  26000  may be provided on the inner surface of the cover member  30000 . 
     In the embodiment, the second coil  26000  may be disposed on the upper portion of the housing  14000 , and may be disposed so as to be spaced apart from the third coil  23000  in the first direction. In other words, the second coil  26000  and the third coil  23000  may be disposed so as to be spaced apart from each other by as great a distance as possible. 
     The third coil  23000  may be disposed under the magnet  13000  so as to be spaced apart from the magnet  13000  by a predetermined distance and to be opposite to the magnet  13000 . Accordingly, the third coil  23000  and the second coil  26000  may be disposed at positions at which they have an electromagnetic effect on each other. 
     In order to perform handshake correction, a driving signal may be applied to the third coil  23000 . The driving signal may be an AC signal. The AC signal may be a sine wave signal or a pulse signal. Specifically, in the case of the pulse signal, the AC signal may be, for example, a pulse width modulation (PWM) signal. 
     When a driving signal is applied to the third coil  23000 , an electromagnetic wave or electromagnetic field may be generated from the third coil  23000 . The electromagnetic wave or electromagnetic field may generate electromotive force, current and voltage through the inductive interaction with the second coil  26000 . 
     The electromotive force and the like of the second coil  26000 , which are induced by the third coil  23000 , are not intentional, and may interfere with each other while the second coil  26000  detects the position of the bobbin  11000 , thereby hindering accurate detection of the position of the bobbin  11000  by the second coil  26000 . 
     In order to suppress the generation of electromotive force, which is induced to the second coil  26000  from the third coil  23000 , the second coil  26000  may be disposed on the upper portion of the housing  14000  such that the second coil  26000  and the third coil  23000  are spaced apart from each other in the first direction by as great a distance as possible. 
       FIG.  28    is a perspective view illustrating the lens moving apparatus shown in  FIG.  25   , from which the bobbin  11000  is removed.  FIG.  29    is a perspective view illustrating the lens moving apparatus shown in  FIG.  28   , from which the second coil  26000  is removed. In the embodiment, the housing  14000  may include a first seating portion  14100 . 
     The first seating portion  14100  is a portion that is formed on the outer side surface of the housing  14000  and on which the second coil  26000  is mounted. Specifically, the first seating portion  14100  may be formed by depressing the outer side surface of the housing  14000 , as illustrated in  FIG.  29   . 
     In the embodiment, since the second coil  26000  is disposed on the upper portion of the housing  14000 , the first seating portion  14100  may also be formed on the upper portion of the housing  14000  so as to correspond to the position of the second coil  26000 . 
     The second coil  26000  have the overall shape of a closed loop so as to surround the upper portion of the housing  14000  when viewed in the first direction. Accordingly, the first seating portion  14100  may also be configured to surround the upper portion of the housing  14000  so as to correspond to the shape of the second coil  26000  when viewed in the first direction. In another embodiment, a mounting groove may be formed in the housing  14000  such that the second coil  26000  is directly wound in the mounting groove. 
     The third coils  26000  may be mounted on the first seating portion  14100  and may be secured or coupled to the surface of the housing  14000  using an adhesive or the like. The adhesive may be, for example, epoxy, thermohardening adhesive or optical hardening adhesive. 
     In order to efficiently employ the inductive interaction between the first coil  12000  and the second coil  26000 , the first coil  12000  and the second coil  26000  may be disposed such that the direction in which the first coil  12000  is wound and the direction in which the second coil  26000  are parallel to each other. 
     As illustrated in  FIG.  28   , both the first coil  12000  and the second coil  26000  may be wound in the direction parallel to the x-y plane, defined by the second and third directions, which are perpendicular to the first direction. 
     As described above, the lens moving apparatus may further include the support member  22000 , which is disposed at the side surface of the housing  14000  so as to be spaced apart from the housing  14000  and which supports the bobbin  11000  and the housing  14000  in such a manner as to permit the bobbin  11000  and the housing  14000  to be movable in the second and/or third direction, perpendicular to the first direction. The lens moving apparatus may further include the circuit board  25000 , which is disposed under the third coil  23000 . 
     The two ends of the second coil  26000  may be conductively connected to the upper elastic member  15000 , and the upper elastic member  15000  may in turn be conductively connected to the support member  22000 . 
     The support member  22000  may be conductively connected to the circuit board  25000 . The circuit board  25000  may be conductively connected to an external device, for example, the main board (not shown) of the camera module. 
     It is sufficient for the second coil  26000  to transmit only variation in voltage, which occurs due to the inductive interaction, to the circuit board  25000  and the main board, and but there is a need to transmit an additional signal regarding the position of the bobbin  11000 . 
     Accordingly, at least four linear support members  22000  are necessary in the embodiment. Specifically, two of the support members  22000  are connected to two ends of the first coil  12000  so as to apply current to the first coil  12000 , and the remaining two support members  22000  are connected to two ends of the second coil  26000  so as to allow the variation in voltage caused by the inductive interaction to be transmitted to the circuit board  25000 . 
     In the case where an additional position sensor for the detection of displacement of the bobbin  11000 , for example, a Hall sensor, a magnetoresistive sensor or the like, is used, unlike the embodiment, it is necessary for the position sensor to have two terminals for the application of current and two terminals for transmitting the detected signal. 
     Consequently, it is necessary to provide four support members  22000  to be connected to the terminals, and it is further necessary to provide two support members  22000  to be connected to two ends of the first coil  12000 . 
     Accordingly, a lens moving apparatus, which is configured to detect displacement of the bobbin  11000  using an additional position sensor, requires at least six linear support members  22000 . In the embodiment, in the case where the second coil  26000  is used without using an additional position sensor, the minimum number of linear support members  22000  may be reduced to four from six. 
     Accordingly, the embodiment is able to simplify the structure of the lens moving apparatus and to reduce the manufacturing cost by detecting displacement of the bobbin  11000  using the second coil  26000 , which generates an electromotive force resulting from the inductive interaction, without having to use an additional position sensor. Furthermore, in the case in which an additional position sensor is used, it is necessary to provide an additional PCB, which is required to mount the position sensor, and a structure for securing the PCB to the housing  14000  and the bobbin  11000 . However, when the second coil  26000  is used, it is not necessary to provide the PCB or the structure for securing the PCB. 
     Furthermore, although the additional position sensor may greatly restrict the linear range in output due to the positional relationship between the position sensor and the magnet  13000 , the use of the second coil  26000 , which employs inductive interaction, broadens the range of linear variation in the voltage of the second coil  26000 , thereby enabling accurate detection of the position of the bobbin  11000  over a wider range. 
       FIG.  30    is a perspective view illustrating the lens moving apparatus according to the embodiment, from which the cover member  30000  is removed.  FIG.  31    is a plan view of  FIG.  30   .  FIG.  32    is a cross-sectional view of  FIG.  30   . 
     As illustrated in  FIG.  30   , the second coil  26000  may be disposed on at least one of the outer side surfaces of the housing  14000 . For example, the second coil  26000  may be configured to have a closed loop shape having a linear part  26100  and a curved part  26200 . 
     As the bobbin  11000  moves in the first direction, the second coil  26000  may generate an electromotive force resulting from the inductive interaction with the first coil  12000 . Accordingly, the lens moving apparatus according to the embodiment is able to detect displacement in the first direction of the bobbin  11000  by measuring variation in voltage of the electromotive force generated by the second coil  26000 . 
     The housing  14000  may be configured to have a polygonal shape when viewed in the first direction. Although the housing  14000  is configured to have a rectangular shape when viewed in the first direction in the embodiment, it may also be configured to have a polygonal shape having five or more corners. 
     As illustrated in  FIGS.  30  to  32   , in order to suppress the generation of electromotive force, which is induced to the second coil  26000  from the third coil  23000 , as much as possible, the second coil  26000  may be disposed on the upper portion of the housing  14000  such that the second coil  26000  and the third coil  23000  are spaced apart from each other by as great a distance as possible. 
       FIG.  33    is a perspective view illustrating the lens moving apparatus shown in  FIG.  30   , from which the bobbin  11000  has been removed.  FIG.  34    is a perspective view illustrating the lens moving apparatus shown in  FIG.  33   , from which the second coil  26000  has been removed.  FIG.  35    is an enlarged view illustrating portion A in  FIG.  34   . In the embodiment, the housing  14000  may include a second seating portion  14200 . 
     The second seating portion  14200  is a portion, which is formed on the outer side surface of the housing  14000  and on which the second coil  26000  is mounted. Specifically, the second seating portion  14200  may include a recess  14200 A and a raised support  14200   b , as illustrated in  FIG.  34   . 
     The recess  14200 A may be formed in the outer side surface of the housing  14000 . The raised support  14200   b  may be raised from the recess  14200 A. In the embodiment, although the raised support  14200   b  is illustrated as being raised at opposite ends thereof more than at the center thereof, the disclosure is not limited thereto. 
     In another embodiment, the raised support  14200   b  may be raised by the same extent at both the opposite ends and the center, or may be raised at the center thereof more than at the opposite ends thereof. 
     The inner surface of the closed loop of the second coil  26000  may be supported by the raised support, thereby seating second coil  26000  in the recess. The second coil  26000  may be seated on the second seating portion  14200 , and may be secured or coupled to the surface of the housing  14000 . 
     In order to efficiently employ the inductive interaction between the first coil  12000  and the second coil  26000 , the first coil  12000  and the second coil  26000  may be disposed such that the direction in which the first coil  12000  is wound and the direction in which the second coil  26000  is wound are parallel to each other. 
     For example, the second coil  26000  may be configured such that the linear part  26100  thereof is longer than the curved part  26200 , and may be wound in the longitudinal direction of the linear part  26100 , as illustrated in  FIG.  30   . Both the first coil  12000  and the linear part  26100  of the second coil  26000  may be wound in the direction parallel to the x-y plane defined by the second and third directions, which are perpendicular to the first direction. 
     As in the description given with reference to  FIGS.  25  to  28   , two ends of the second coil  26000  may be conductively connected to the upper elastic member  15000 . The upper elastic member  15000  may be conductively connected to the support member  22000 . The support member  22000  may be conductively connected to the circuit board  25000 . The circuit board  25000  may be connected to the main board. 
     It is sufficient for the second coil  26000  to transmit only variation in voltage, which occurs due to the inductive interaction, to the circuit board  25000  and the main board, and but there is a need to transmit an additional signal regarding the position of the bobbin  11000 . Accordingly, the embodiment requires at least four support members  22000 , as described above. Generally, the equivalent circuit of a coil is constituted by a resistance component, an inductance component and a capacitance component, and thus has an inherent electrical resonant frequency, which is referred to as a self-resonant frequency. A coil causes resonance at the resonant frequency. At this time, current and voltage that flow through the coil are maximized. 
     Accordingly, since the circuit has the maximum current and voltage at the self-resonant frequency, it is possible to create a strong electromagnetic wave and a strong electromagnetic field. The reason for this is because the magnitude of current and voltage are proportional to the magnitude of the electromagnetic wave and electromagnetic field. 
     Consequently, when the first coil  12000  and the third coil  23000  have the same self-resonant frequency, each of the circuit including the first coil  12000  and the circuit including the third coil  23000  may create a strong electromagnetic wave and a strong electromagnetic field, whereby the first coil  12000  and the third coil  23000  may cause increased electromagnetic interference with each other. 
     The electromagnetic interference between the first coil  12000  and the third coil  23000  may disrupt the function of the first coil  12000  and the third coil  23000 . As a result, the functions of auto-focusing and handshake correction of the lens moving apparatus may be deteriorated. 
     Accordingly, in order to inhibit the deterioration in the functions of auto-focusing and handshake correction of the lens moving apparatus, the first and second coils  12000  and  23000  are preferably designed so as to have different self-resonant frequencies. 
     Here, the self-resonant frequency of the first coil  12000  and the self-resonant frequency of the third coil  23000  are preferably designed so as to have a difference therebetween of 20 kHz or more. More preferably, the self-resonant frequency of the first coil  12000  and the self-resonant frequency of the third coil  23000  may have a difference therebetween of 20 kHz to 3 MHz. 
     As described previously, in order to reduce the deterioration in the functions of the third coil  23000  and the second coil  26000 , the third coil  23000  and the second coil  26000  preferably have different self-resonant frequencies. 
     Here, the self-resonant frequency of the third coil  23000  and the self-resonant frequency of the second coil  26000  are preferably designed so as to have a difference therebetween of 20 kHz or more. More preferably, the self-resonant frequency of the third coil  23000  and the self-resonant frequency of the second coil  26000  have a difference therebetween of 20 kHz to 3 MHz. 
     When the driving single applied to the third coil  23000  is a PWM signal, noise may be transmitted to the image sensor (not shown) provided under the third coil  23000  in response to the PWM signal of the third coil  23000 , thereby causing deterioration in the functionality of the image sensor. 
     The noise may cause deterioration in the function of the image sensor, and may thus cause distortion and degradation of an image formed on the image sensor. Accordingly, the third coil  23000  may be designed so as to have a self-resonant frequency of 0.5 MHz or more, and preferably a self-resonant frequency ranging from 0.5 MHz to 7 MHz. 
     Furthermore, in order to minimize the problem whereby high-frequency noise generated from the third coil  23000  is transmitted to the first coil  12000 , the self-resonant frequency of the first coil  12000  and the self-resonant frequency of the third coil  23000  need to have a difference therebetween of 20 kHz, and preferably a difference therebetween of 20 kHz to 3 MHz. 
     In addition, in order to minimize the problem whereby high-frequency noise generated from the third coil  23000  is transmitted to the second coil  26000 , the self-resonant frequency of the third coil  23000  and the self-resonant frequency of the second coil  26000  need to have a difference therebetween of 20 kHz, and preferably a difference therebetween of 20 kHz to 3 MHz. 
     The self-resonant frequency of the third coil  23000  is preferably designed so as to be higher than the self-resonant frequency of the first coil  12000 . Furthermore, the self-resonant frequency of the third coil  23000  is preferably designed so as to be higher than the self-resonant frequency of the second coil  26000 . 
     In another embodiment, in order to suppress the transmission of noise generated from the third coil  23000  to the image sensor, a blocking member (not shown) capable of blocking an electromagnetic wave or an electromagnetic field may be provided between the third coil  23000  and the image sensor. 
     In addition, in order to more efficiently suppress the transmission of noise to the image sensor and the third coil, the third coil  23000  may be designed so as to have a self-resonant frequency of 0.5 MHz to 7 MHz, and the blocking member may be provided. 
     Meanwhile, the lens moving apparatus according to the embodiments described above may be used in various applications, for example, as a camera module. The camera module may be applied to, for example, mobile appliances such as a cellular phone. 
     The camera module according to the embodiment may include a lens barrel, coupled to the bobbin  11000 , and an image sensor (not shown). The lens barrel may include at least one lens, which transmits an image to the image sensor. 
     In addition, the camera module may further include an infrared-light blocking filter (not shown). The infrared-light blocking filter serves to inhibit infrared light from being introduced to the image sensor. 
     In this case, the infrared-light blocking filter may be installed on the position of the base  21000  illustrated in  FIG.  23   , which corresponds to the image sensor, and may be coupled to a holder member (not shown). In addition, the holder member may support the lower side of the base  21000 . 
     A separate terminal member for electrical conduction with the circuit board  25000  may be installed on the base  21000 , and a terminal may be integrally formed using, for example, a surface electrode. 
     Meanwhile, the base  21000  may function as a sensor holder that protects the image sensor. In this case, a protrusion may be formed on the side surface of the base  21000  so as to protrude downward. However, the protrusion may not be necessary, and although not illustrated, a separate sensor holder may be located below the base  21000 . 
       FIG.  36    is a perspective view illustrating a portable terminal  200 A according to an embodiment, and  FIG.  37    is a view illustrating the configuration of the portable terminal illustrated in  FIG.  36   . 
     Referring to  FIGS.  36  and  37   , the portable terminal  200 A (hereinafter referred to as a “terminal”) may include a body  850 , a wireless communication unit  710   a , an A/V input unit  720 , a sensing unit  740 , an input/output unit  750 , a memory unit  760 , an interface unit  770 , a controller  780 , and a power supply unit  790 . 
     The body  850  illustrated in  FIG.  36    has a bar shape, without being limited thereto, and may be any of various types, such as for example a slide type, a folder type, a swing type, or a swivel type, in which two or more sub-bodies are coupled so as to be movable relative to each other. 
     The body  850  may include a case (i.e. casing, housing, or cover) defining the external appearance of the terminal. For example, the body  850  may be divided into a front case  851  and a rear case  852 . A variety of electronic components of the terminal may be mounted in the space defined between the front case  851  and the rear case  852 . 
     The wireless communication unit  710   a  may include one or more modules, which enable wireless communication between the terminal  200 A and a wireless communication system or between the terminal  200 A and the network in which the terminal  200 A is located. For example, the wireless communication unit  710   a  may include a broadcast receiving module  711 , a mobile communication module  712 , a wireless Internet module  713 , a near field communication module  714 , and a location information module  715 . 
     The A/V input unit  720  serves to input audio signals or video signals, and may include, for example, a camera  721  and a microphone  722 . 
     The camera  721  may be the camera  200  including the lens moving apparatus according to the embodiment illustrated in  FIGS.  11  and  23   . 
     The sensing unit  740  may sense the current state of the terminal  200 A, such as for example the opening or closing of the terminal  200 A, the location of the terminal  200 A, the occurrence of a user&#39;s touch, the orientation of the terminal  200 A, or the acceleration/deceleration of the terminal  200 A, and may generate a sensing signal to control the operation of the terminal  200 A. For example, when the terminal  200 A is a slide-type phone, the sensing unit  740  may sense whether the slide-type phone is opened or closed. In addition, the sensing unit  740  serves to sense, for example, whether power is supplied from the power supply unit  790 , or whether the interface unit  770  is coupled to an external appliance. 
     The input/output unit  750  serves to generate, for example, visual, audible, or tactile input or output. The input/output unit  750  may generate input data to control the operation of the terminal  200 A, and may display information processed in the terminal  200 A. 
     The input/output unit  750  may include a keypad unit  730 , a display module  751 , a sound output module  752 , and a touchscreen panel  753 . The keypad unit  730  may generate input data in response to input via a keypad. 
     The display module  751  may include a plurality of pixels, the color of which varies in response to electrical signals. For example, the display module  751  may include at least one of a liquid crystal display, a thin film transistor liquid crystal display, an organic light-emitting diode display, a flexible display and a 3D display. 
     The sound output module  752  may output audio data received from the wireless communication unit  710   a  in, for example, a call signal receiving mode, a calling mode, a recording mode, a voice recognition mode, or a broadcast receiving mode, or may output audio data stored in the memory unit  760 . 
     The touchscreen panel  753  may convert variation in capacitance, caused by a user&#39;s touch on a specific touchscreen region, into electrical input signals. 
     The memory unit  760  may store programs for the processing and control of the controller  780 , and may temporarily store input/output data (e.g. a phone book, messages, audio, still images, pictures, and moving images). For example, the memory unit  760  may store images captured by the camera  721 , for example, pictures or moving images. 
     The interface unit  770  serves as a passage for connection between the terminal  200 A and an external appliance. The interface unit  770  may receive power or data from the external appliance, and may transmit the same to respective constituent elements inside the terminal  200 A, or may transmit data inside the terminal  200 A to the external appliance. For example, the interface unit  770  may include, for example, a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for the connection of a device having an identification module, an audio input/output (I/O) port, a video I/O port, and an earphone port. 
     The controller  780  may control the general operation of the terminal  200 A. For example, the controller  780  may perform control and processing related to, for example, a voice call, data communication, and a video call. The controller  780  may include a panel controller of a touchscreen panel drive unit, or may perform the function of the panel controller. 
     The controller  780  may include a multimedia module  781  for the playback of a multimedia file. The multimedia module  781  may be provided inside the controller  780 , or may be provided separately from the controller  780 . 
     The controller  780  may perform pattern recognition processing, by which writing or drawing, input to a touchscreen, is perceivable as characters and images, respectively. 
     The power supply unit  790  may supply power required to operate the respective constituent elements upon receiving external power or internal power under the control of the controller  780 . 
     As is apparent from the above description, the embodiments are able to assure linearity over a wider range, to decrease a defect rate, and to perform more accurate AF feedback control. In addition, the embodiments are able to simplify the structure of the lens moving apparatus and to reduce the manufacturing cost by detecting displacement of the bobbin using the third coil, which generates an electromotive force resulting from the inductive interaction, without having to use an additional position sensor. 
     Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.