Patent Publication Number: US-11380478-B2

Title: Coil component

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims benefit of priority to Korean Patent Application Nos. 10-2018-0028217 filed on Mar. 9, 2018 and 10-2018-0051913 filed on May 4, 2018 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to a coil component. 
     BACKGROUND 
     An inductor, a coil component, is a representative passive electronic component used in an electronic device, together with a resistor and a capacitor. 
     In accordance with gradual performance improvement and size decrease of the electronic device, the number of electronic components used in an electronic device has increased, while sizes of such electronic components have been decreased. 
     For the reason described above, demand for removal of a noise generation source such as electromagnetic interference (EMI) of the electronic components has gradually increased. 
     In current general EMI shielding technology, electronic components are mounted on a board, and the electronic components and the board are then simultaneously surrounded by a shield can. 
     SUMMARY 
     An aspect of the present disclosure may provide a coil component in which a leaked magnetic flux may be decreased. 
     An aspect of the present disclosure may also provide a coil component in which magnetic fluxes leaked to opposite end surfaces are made uniform. 
     According to an aspect of the present disclosure, a coil component may include: a body having a first surface and a second surface opposing each other in one direction and including a core extending in the one direction; a coil portion embedded in the body and having at least one turn around the core; and an external electrode disposed at least on the first surface of the body and connected to the coil portion. A first distance from the coil portion to a third surface of the body may be greater than a second distance from the coil portion to a fourth surface of the body. The third and fourth surfaces may oppose each other and have the core disposed therebetween. Turns of the coil portion disposed between the third surface of the body and the core may be more than those of the coil portion disposed between the fourth surface of the body and the core. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a schematic perspective view illustrating a coil component according to a first exemplary embodiment in the present disclosure; 
         FIG. 2  is a cross-sectional view taken along line I-I′ of  FIG. 1 ; 
         FIG. 3  is a cross-sectional view taken along line II-II′ of  FIG. 1 ; 
         FIG. 4  is a plan view illustrating a coil portion; 
         FIG. 5  is a cross-sectional view illustrating a coil component according to a second exemplary embodiment in the present disclosure and corresponding to the cross-sectional view taken along line I-I′ of  FIG. 1 ; 
         FIG. 6  is a cross-sectional view illustrating a coil component according to a third exemplary embodiment in the present disclosure and corresponding to the cross-sectional view taken along line I-I′ of  FIG. 1 ; 
         FIG. 7  is a cross-sectional view illustrating a coil component according to a modified example of a third exemplary embodiment in the present disclosure and corresponding to the cross-sectional view taken along line I-I′ of  FIG. 1   
         FIG. 8  is a schematic perspective view illustrating a coil component according to a fourth exemplary embodiment in the present disclosure; and 
         FIG. 9  is a cross-sectional view taken along an LT plane of  FIG. 8 . 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. 
     In the drawings, an L direction refers to a first direction or a length direction, a W direction refers to a second direction or a width direction, and a T direction refers to a third direction or a thickness direction. 
     Hereinafter, coil components according to exemplary embodiment in the present disclosure will be described in detail with reference to the accompanying drawings. In describing exemplary embodiments in the present disclosure with reference to the accompanying drawings, components that are the same as or correspond to each other will be denoted by the same reference numerals, and an overlapping description therefor will be omitted. 
     Various kinds of electronic components may be used in an electronic device, and various kinds of coil components may be appropriately used between these electronic components depending on their purposes in order to remove noise, or the like. 
     That is, the coil components used in the electronic device may be a power inductor, high frequency (HF) inductors, a general bead, a bead for a high frequency (GHz), a common mode filter, and the like. 
     First Exemplary Embodiment 
       FIG. 1  is a schematic perspective view illustrating a coil component according to a first exemplary embodiment in the present disclosure.  FIG. 2  is a cross-sectional view taken along line I-I′ of  FIG. 1 .  FIG. 3  is a cross-sectional view taken along line II-II′ of  FIG. 1 .  FIG. 4  is a plan view illustrating a coil portion. 
     Referring to  FIGS. 1 through 4 , a coil component  1000  according to a first exemplary embodiment in the present disclosure may include a body  100 , a coil portion  200 , external electrodes  300  and  400 , a shielding layer  500 , an insulating layer  600 , and a gap portion G, and may further include a cover layer  700 , an internal insulating layer IL, and an insulating film IF. 
     The body  100  may form an appearance of the coil component  1000  according to the present exemplary embodiment, and may bury the coil portion  200  therein. 
     The body  100  may generally have a hexahedral shape. 
     A first exemplary embodiment in the present disclosure will hereinafter be described on the assumption that the body  100  has the hexahedral shape. However, such a description does not exclude a coil component including a body having a shape other than the hexahedral shape from the scope of the present exemplary embodiment. 
     The body  100  may have a first surface and a second surface opposing each other in the length direction (L), a third surface and a fourth surface opposing each other in the width direction (W), and a fifth surface and a sixth surface opposing each other in the thickness direction (T). The first to fourth surfaces of the body  100  may correspond to walls of the body  100  connecting the fifth and sixth surfaces of the body  100  to each other. The walls of the body  100  may include the first and second surfaces, which are opposite end surfaces opposing each other, and the third and fourth surfaces, which are opposite side surfaces opposing each other. 
     The body  100  may be formed so that the coil component  1000  according to the present exemplary embodiment in which external electrodes  300  and  400 , an insulating layer  600 , a shielding layer  500 , and a cover layer  700  to be described below are formed may have a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.65 mm by way of example, but is not limited thereto. Meanwhile, the numerical values of the length, the width, and the thickness of the coil component described above, which are numeral values except for tolerances, may be different from actual numerical values of the length, the width, and the thickness of the coil component. 
     The body  100  may include magnetic materials and a resin. In detail, the body may be formed by stacking one or more magnetic composite sheets in which the magnetic materials are dispersed in the resin. However, the body  100  may also have a structure other than a structure in which the magnetic materials are dispersed in the resin. For example, the body  100  may be formed of a magnetic material such as ferrite. 
     The magnetic material may be ferrite or metal magnetic powder particles. 
     The ferrite may be, for example, one or more of spinel type ferrites such as Mg—Zn-based ferrite, Mn—Zn-based ferrite, Mn—Mg-based ferrite, Cu—Zn-based ferrite, Mg—Mn—Sr-based ferrite, or Ni—Zn-based ferrite, hexagonal ferrites such as Ba—Zn-based ferrite, Ba—Mg-based ferrite, Ba—Ni-based ferrite, Ba—Co-based ferrite, or Ba—Ni—Co-based ferrite, garnet type ferrite such as Y-based ferrite, Li-based ferrite. 
     The metal magnetic powder particles may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metal magnetic powder particles may be one or more of pure iron powder particles, Fe—Si-based alloy powder particles, Fe—Si—Al-based alloy powder particles, Fe—Ni-based alloy powder particles, Fe—Ni—Mo-based alloy powder particles, Fe—Ni—Mo—Cu-based alloy powder particles, Fe—Co-based alloy powder particles, Fe—Ni—Co-based alloy powder particles, Fe—Cr-based alloy powder particles, Fe—Cr—Si-based alloy powder particles, Fe—Si—Cu—Nb-based alloy powder particles, Fe—Ni—Cr-based alloy powder particles, and Fe—Cr—Al-based alloy powder particles. 
     The metal magnetic powder particles may be amorphous or crystalline. For example, the metal magnetic powder particles may be Fe—Si—B—Cr based amorphous alloy powder particles, but are not necessarily limited thereto. 
     The ferrite and the metal magnetic powder particles may have average diameters of about 0.1 μm to 30 μm, respectively, but are not limited thereto. 
     The body  100  may include two kinds or more of magnetic materials dispersed in the resin. Here, different kinds of magnetic materials mean that the magnetic materials dispersed in the resin are distinguished from each other by any one of an average diameter, a composition, crystallinity, and a shape. 
     The resin may include epoxy, polyimide, liquid crystal polymer (LCP), or the like, or mixtures thereof, but is not limited thereto. 
     The body  100  may include a core  110  penetrating through a coil portion  200  to be described below. The core  110  may be formed by filling a through-hole of the coil portion  200  with the magnetic composite sheet, but is not limited thereto. 
     The coil portion  200  may be embedded in the body  100 , and may implement characteristics of the coil component. For example, when the coil component  1000  is used as a power inductor, the coil portion  200  may serve to store an electric field as a magnetic field to maintain an output voltage, resulting in stabilization of power of an electronic device. 
     The coil portion  200  may include a first coil pattern  211 , a second coil pattern  212 , and a via  220 . 
     The first coil pattern  211 , the second coil pattern  212 , and an internal insulating layer IL to be described below may be stacked in the thickness direction (T) of the body  100 . 
     Each of the first coil pattern  211  and the second coil pattern  212  may have a planar spiral shape. As an example, in  FIG. 1 , the first coil pattern  211  may form at least one turn around the core  110  of the body  100  on a lower surface of the internal insulating layer IL, and the second coil pattern  212  may form at least one turn around the core  110  of the body  100  on an upper surface of the internal insulating layer IL. 
     The via  220  may penetrate through the internal insulating layer IL to electrically connect the first coil pattern  211  and the second coil pattern  212  to each other, and may be in contact with each of the first coil pattern  211  and the second coil pattern  212 . Resultantly, the coil portion  200  according to the present exemplary embodiment may be formed of one coil generating a magnetic field in the thickness direction (T) of the body  100 . 
     At least one of the first coil pattern  211 , the second coil pattern  212 , and the via  220  may include one or more conductive layers. 
     As an example, when the second coil pattern  212  and the via  220  are formed by plating, each of the second coil pattern  212  and the via  220  may include a seed layer of an electroless plating layer and an electroplating layer. Here, the electroplating layer may have a single-layer structure or have a multilayer structure. The electroplating layer having the multilayer structure may be formed in a conformal film structure in which another electroplating layer covers any one electroplating layer, or may be formed in a shape in which another electroplating layer is stacked on only one surface of anyone electroplating layer. The seed layer of the second coil pattern  212  and the seed layer of the via  220  may be formed integrally with each other, such that a boundary therebetween may not be formed, but are not limited thereto. The electroplating layer of the second coil pattern  212  and the electroplating layer of the via  220  may be formed integrally with each other, such that a boundary therebetween may not be formed, but are not limited thereto. 
     As another example, when the coil portion  200  is formed by separately forming the first coil pattern  211  and the second coil pattern  212  and then collectively stacking the first coil pattern  211  and the second coil pattern  212  beneath and on the internal insulating layer IL, respectively, the via  220  may include a high melting point metal layer and a low melting point metal layer having a melting point lower than that of the high melting point metal layer. Here, the low melting point metal layer may be formed of a solder including lead (Pb) and/or tin (Sn). At least a portion of the low melting point metal layer may be melted due to a pressure and a temperature at the time of the collective stacking, such that an inter-metallic compound (IMC) layer may be formed on a boundary between the low melting point metal layer and the second coil pattern  212 . 
     The first coil pattern  211  and the second coil pattern  212  may protrude on the lower surface and the upper surface of the internal insulating layer IL, respectively, as an example. As another example, the first coil pattern  211  may be embedded in the lower surface of the internal insulating layer IL, such that a lower surface of the first coil pattern  211  may be exposed to the lower surface of the internal insulating layer IL, and the second coil pattern  212  may protrude on the upper surface of the internal insulating layer IL. In this case, concave portions may be formed in the lower surface of the first coil pattern  211 , such that the lower surface of the internal insulating layer IL and the lower surface of the first coil pattern  211  may not be disposed to be coplanar with each other. As another example, the first coil pattern  211  may be embedded in the lower surface of the internal insulating layer IL, such that a lower surface of the first coil pattern  211  may be exposed to the lower surface of the internal insulating layer IL, and the second coil pattern  212  may be embedded in the upper surface of the internal insulating layer IL, such that an upper surface of the second coil pattern  212  may be exposed to the upper surface of the internal insulating layer IL. 
     End portions of the first coil pattern  211  and the second coil pattern  212  may be exposed to the first surface and the second surface of the body  100 , respectively. The end portion of the first coil pattern  211  exposed to the first surface of the body  100  may be in contact with a first external electrode  300  to be described below, such that the first coil pattern  211  may be electrically connected to the first external electrode  300 . The end portion of the second coil pattern  212  exposed to the second surface of the body  100  may be in contact with a second external electrode  400  to be described below, such that the second coil pattern  212  may be electrically connected to the second external electrode  400 . 
     Each of the first coil pattern  211 , the second coil pattern  212 , and the via  220  may be formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof, but is not limited thereto. 
     The internal insulating layer IL may be formed of an insulating material including at least one of a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as a polyimide resin, and a photosensitive insulating resin or be formed of an insulating material having a reinforcement material such as a glass fiber or an inorganic filler impregnated in such an insulating resin. As an example, the internal insulating layer IL may be formed of an insulating material such as prepreg, an Ajinomoto Build-up Film (ABF), FR-4, a Bismaleimide Triazine (BT) resin, a photoimageable dielectric (PID), or the like, but is not limited thereto. 
     As the inorganic filler, one or more materials selected from the group consisting of silica (SiO 2 ), alumina (Al 2 O 3 ), silicon carbide (SiC), barium sulfate (BaSO 4 ), talc, clay, mica powder particles, aluminum hydroxide (AlOH 3 ), magnesium hydroxide (Mg(OH) 2 ), calcium carbonate (CaCO 3 ), magnesium carbonate (MgCO 3 ), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO 3 ), barium titanate (BaTiO 3 ), and calcium zirconate (CaZrO 3 ) may be used. 
     When the internal insulating layer IL is formed of the insulating material including the reinforcing material, the internal insulating layer IL may provide more excellent rigidity. When the internal insulating layer IL is formed of an insulating material that does not include a glass fiber, the internal insulating layer IL may be advantageous for decreasing an entire thickness of the coil portion  200 . When the internal insulating layer IL is formed of the insulating material including the photosensitive insulating resin, the number of processes may be decreased, which is advantageous for decreasing a production cost, and a fine hole may be drilled. 
     The insulating film IF may be formed along surfaces of the first coil pattern  211 , the internal insulating layer IL, and the second coil pattern  212 . The insulating film IF may be provided in order to protect and insulate the first and second coil patterns  211  and  212 , and may include any known insulating material such as parylene, or the like. The insulating material m included in the insulating film IF is not particularly limited, but may be any insulating material. The insulating film IF may be formed by a method such as vapor deposition, or the like, but is not limited thereto. That is, the insulating film IF may be formed by stacking insulating films on opposite surfaces of the internal insulating layer IL on which the first and second coil patterns  211  and  212  are formed. 
     Meanwhile, although not illustrated, the number of at least one of first and second coil patterns  211  and  212  may be plural. As an example, the coil portion  200  may include a plurality of first coil patterns  211 , and may have a structure in which another first coil pattern is stacked on a lower surface of any one first coil pattern. In this case, an additional insulating layer may be disposed between the plurality of first coil patterns  211 , and the plurality of first coil patterns  211  may be connected to each other by a connection via penetrating through the additional insulating layer. However, the coil portion is not limited thereto. 
     In the present disclosure, the coil portion  200  may be embedded in an asymmetric structure in the body  100 . That is, the body  100  may include one region and the other region positioned symmetrically to each other in relation to the core  110  in the width direction of the body  100 , and one region of the body may be formed at a width a greater than a width b of the other region of the body  100 . This will be described. The width a may refer to a distance from the coil portion  200  to the third surface of the body  100 , and the width b may refer to a distance from the coil portion  200  to the fourth surface of the body  100 . 
     Referring to  FIGS. 3 and 4 , the second coil pattern  212  may format least one turn around the core  110 , and may be formed to have different turns at both sides of the core  110  in the width direction of the body  100 . That is, in  FIG. 3 , turns of the second coil pattern  212  formed on a left side of the core  110  may be more than those of the second coil pattern  212  formed on a right side of the core  110 . In  FIG. 4 , which is a plan view, turns of the second coil pattern  212  formed on an upper side of the core  110  may be more than those of the second coil pattern  121  formed on a lower side of the core  110 . Here, the third surface of the body  100  may correspond to a left side surface of the body  100  illustrated in  FIG. 3  and an upper side surface of the body  100  illustrated in  FIG. 4 , and the fourth surface of the body  100  may correspond to a right side surface of the body  100  illustrated in  FIG. 3  and a lower side surface of the body  100  illustrated in  FIG. 3 . 
     Due to such a difference between the turns of the coil portion, magnetic fluxes leaked to the third and fourth surfaces of the body  100  opposing each other in the width direction of the body  100  may be different from each other. In this case, an additional process of distinguishing the third and fourth surfaces of the coil component from each other may be required in consideration of electromagnetic interference with another electronic component in mounting the coil component on a printed circuit board, or the like. 
     In the present disclosure, the magnetic fluxes leaked to the third and fourth surfaces of the body  100  may be made uniform by forming the body at a relatively large thickness at an outer side of a region in which a larger number of turns of the coil portion are disposed and forming the body at a relatively small thickness at an outer side of a region in which a smaller number of turns of the coil portion are disposed. That is, one region of the body may be formed at the width a greater than the width b of the other region of the body to control the magnetic fluxes leaked to the third and fourth surfaces of the body  100  to be substantially the same as each other. Therefore, the coil component according to the present exemplary embodiment does not require the additional process of distinguishing the third and fourth surfaces from each other in being mounted on the printed circuit board, or the like. 
     A different between the width a of one region of the body and the width b of the other region of the body may exceed 0 and be 50 μm or less. When the difference between the width a and the width b is 0, the coil portion is embedded in a substantially symmetrical structure, and thus, the effect of the present exemplary embodiment described above may not be accomplished. When the difference between the width a and the width b exceeds 50 μm, an entire size of the coil component may be increased, which is disadvantageous for thinness of the coil component, and characteristics of the coil component such as a quality (Q) factor, and the like, may be deteriorated. 
     The external electrodes  300  and  400  may be disposed on the first and second surfaces of the body  100 , respectively, and may be connected to the coil patterns  211  and  212 , respectively. The external electrodes  300  and  400  may include the first external electrode  300  connected to the first coil pattern  211  and the second external electrode  400  connected to the second coil pattern  212 . In detail, the first external electrode  300  may include a first connected portion  310  disposed on the first surface of the body  100  and connected to the end portion of the first coil pattern  211  and a first extending portion  320  extending from the first connected portion  310  to the sixth surface of the body  100 . The second external electrode  400  may include a second connected portion  410  disposed on the second surface of the body  100  and connected to the end portion of the second coil pattern  212  and a second extending portion  420  extending from the second connected portion  410  to the sixth surface of the body  100 . The first extending portion  320  and the second extending portion  420  each disposed on the sixth surface of the body  100  may be spaced apart from each other so that the first external electrode  300  and the second external electrode  400  are not in contact with each other. 
     The external electrodes  300  and  400  may electrically connect the coil component  1000  to the printed circuit board, or the like, when the coil component  1000  according to the present exemplary embodiment is mounted on the printed circuit board, or the like. As an example, the coil component  1000  according to the present exemplary embodiment may be mounted on the printed circuit board so that the sixth surface of the body  100  faces an upper surface of the printed circuit board, and the extending portions  320  and  420  of the external electrodes  300  and  400  disposed on the sixth surface of the body  100  and connection portions of the printed circuit board may be electrically connected to each other by solders, or the like. 
     The external electrodes  300  and  400  may include a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof, but are not limited thereto. 
     The external electrodes  300  and  400  may be formed by at least one of a paste printing method, a plating method, and a vapor deposition method. As an example, each of the external electrodes  300  and  400  may include a conductive resin layer formed by printing a conductive paste including conductive metal powder particles and a thermosetting resin and a conductive layer formed on the conductive resin layer by plating. 
     The shielding layer  500  may be disposed on the first to fifth surfaces of the body  100 . That is, the shielding layer  500  may include a cap portion  510  disposed on the fifth surface of the body opposing the sixth surface of the body  100  and sidewall portions  521 ,  522 ,  523 , and  524  disposed, respectively, on the first to fourth surfaces of the body connecting the sixth surface of the body  100  and the fifth surface of the body  100  to each other and connected to the cap portion  510 . The shielding layer  500  according to the present exemplary embodiment may be disposed on all the surfaces of the body  100  except for the sixth surface of the body  100 , which is a mounting surface of the coil component  1000  according to the present exemplary embodiment. 
     The first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with one another. That is, the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be formed by the same process, such that boundaries therebetween may not be formed. As an example, the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with one another by stacking a single shielding sheet having an insulating film and a shielding film on the first to fourth surfaces of the body  100 . Here, the insulating film of the shielding sheet may correspond to an insulating layer  600  to be described below. Meanwhile, in the above example, a cross section of a region in which any one sidewall portion and another sidewall portion are connected to each other may be formed as a curved surface due to physical processing of the shielding sheet. As another example, when the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  are formed by performing vapor deposition such as sputtering, or the like, on the first to fourth surfaces of the body  100  on which the insulating layer  600  is formed, the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with one another. As another example, when the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  are formed by performing plating on the first to fourth surfaces of the body  100  on which the insulating layer  600  is formed, the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with one another. 
     The cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with each other. That is, the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  may be formed by the same process, such that boundaries therebetween may not be formed. As an example, the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with each other by attaching a single shielding sheet including an insulating film and a shielding film to the first to fifth surfaces of the body  100 . Here, the insulating film of the shielding sheet may correspond to an insulating layer  600  to be described below. As another example, the cap portion  510  and the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with one another by performing a vapor deposition process such as sputtering on the first to fifth surfaces of the body  100  on which the insulating layer  600  is formed. As another example, the cap portion  510  and the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be formed integrally with one another by performing a plating process on the first to fifth surfaces of the body  100  on which the insulating layer  600  is formed. 
     Each of connected portions between the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  may have a curved surface shape. As an example, when the shielding sheet is processed to correspond to a shape of the body and is attached to the first to fifth surfaces of the body  100 , a cross section of a region in which the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  are connected to each other may be formed as a curved surface. As another example, when the shielding layer  500  is formed on the first to fifth surfaces of the body  100  on which the insulating layer  600  is formed, by the vapor deposition such as the sputtering, a cross section of a region in which the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  are connected to each other may be formed as a curved surface. As another example, when the shielding layer  500  is formed on the first to fifth surfaces of the body  100  on which the insulating layer  600  is formed, by the plating, a cross section of a region in which the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  are connected to each other may be formed as a curved surface. 
     Each of the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may have one end connected to the cap portion  510  and the other end opposing the one end, and the other end of each of the first to fourth sidewall portions  521 ,  522 ,  523 , and  524  may be spaced apart from the sixth surface of the body  100  by a predetermined distance by a gap portion G to be described below. 
     The shielding layer  500  may be formed at a thickness of 10 nm to 100 μm. When the thickness of the shielding layer  500  is less than 10 nm, a shielding effect may not substantially exist, and when the thickness of the shielding layer  500  exceeds 100 μm, an entire length, width, and thickness of the coil component may be increased, which is disadvantageous for thinness of the coil component. 
     The shielding layer  500  may include at least one of a conductor and a magnetic material. As an example, the conductor may be a metal or an alloy including one or more selected from the group consisting of copper (Cu), silver (Ag), gold (Au), aluminum (Al), iron (Fe), silicon (Si), boron (B), chromium (Cr), niobium (Nb), and nickel (Ni), and may be Fe—Si or Fe—Ni. In addition, the shielding layer  500  may include one or more selected from the group consisting of ferrite, permalloy, and an amorphous ribbon. The shielding layer  500  may be, for example, a copper plating layer, but is not limited thereto. The shielding layer  500  may have a multilayer structure. As an example, the shielding layer  500  may be formed in a double layer structure including a conductor layer and a magnetic layer formed on the conductor layer, a double layer structure including a first conductor layer and a second conductor layer formed on the first conductor layer, or a structure of a plurality of conductor layers. Here, the first and second conductor layers may include different conductors, but may also include the same conductor. 
     The shielding layer  500  may include two or more fine structures separated from each other. As an example, when each of the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  is formed of an amorphous ribbon sheet separated into a plurality of pieces, each of the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  may include a plurality of fine structures separated from each other. As another example, when each of the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  is formed by the sputtering, each of the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  may include a plurality of fine structures distinguished from each other by grain boundaries. 
     The insulating layer  600  may be disposed between the body  100  and the shielding layer  500  to electrically isolate m the shielding layer  500  from the body  100  and the external electrodes  300  and  400 . In the present exemplary embodiment, the insulating layer  600  may be disposed on the first to fifth surfaces of the body  100 . Since the connected portions  310  and  410  of the external electrodes  300  and  400  are formed on the first and second surfaces of the body  100 , respectively, the connected portions  310  and  410  of the external electrodes  300  and  400 , the insulating layer  600 , and the sidewall portions  521  and  522  of the shielding layer  500  may be sequentially disposed on each of the first and second surfaces of the body  100 . Since the connected portions  310  and  410  of the external electrodes  300  and  400  are not formed on the third and fourth surfaces of the body  100 , respectively, the insulating layer  600 , and the sidewall portions  523  and  524  of the shielding layer  500  may be sequentially disposed on each of the third and fourth surfaces of the body  100 . 
     The insulating layer  600  may include a thermoplastic resin such as polystyrenes, vinyl acetates, polyesters, polyethylenes, polypropylenes, polyamides, rubbers, or acryls, a thermosetting resin such as phenols, epoxies, urethanes, melamines, or alkyds, a photosensitive resin, parylene, SiO x , or SiN x . 
     The insulating layer  600  may have an adhesive function. As an example, when the insulating layer  600  and the shielding layer  500  are formed of a shielding sheet including an insulating film and a shielding film, the insulating film of the shielding sheet may include an adhesive component to adhere the shielding film to surfaces of the body  100 . In this case, an adhesive layer may separately be formed between one surface of the insulating layer  600  and the body  100 . However, when the insulating layer  600  is formed using an insulating film in a B-stage, a separate adhesive layer may not be formed on one surface of the insulating layer  600 . 
     The insulating layer  600  may be formed by applying a liquid-phase insulating resin to the surfaces of the body  100 , stacking an insulating film such as a dry film (DF) on the surfaces of the body  100 , or forming an insulating resin on the surfaces of the body  100  by vapor deposition. The insulating film may be an ABF that does not include a photosensitive insulating resin, a polyimide film, or the like. 
     The insulating layer  600  may be formed in a thickness range of 10 nm to 100 μm. When a thickness of the insulating layer  600  is less than 10 nm, characteristics of the coil component such as a Q factor, or the like, may be deteriorated, and when a thickness of the insulating layer  600  exceeds 100 μm, an entire length, width, and thickness of the coil component may be increased, which is disadvantageous for thinness of the coil component. 
     The cover layer  700  may be disposed on the shielding layer  500  in order to prevent the shielding layer  500  from being electrically connected to another external electronic component and/or the external electrodes  300  and  400 . The cover layer  700  may cover the cap portion  510  and the first to fourth sidewall portions  521 ,  522 ,  523 , and  524 . 
     The cover layer  700  may include at least one of a thermoplastic resin such as polystyrenes, vinyl acetates, polyesters, polyethylenes, polypropylenes, polyamides, rubbers, or acryls, a thermosetting resin such as phenols, epoxies, urethanes, melamines, or alkyds, a photosensitive insulating resin, parylene, SiO x , and SiN x . 
     As an example, the cover layer  700  may be formed simultaneously with the insulating layer  600  and the shielding layer  500  by disposing an insulating film of a shielding sheet including the insulating film, a shielding film, and a cover film to face the body  100  and then stacking the shielding sheet on the body  100 . As another example, the cover layer  700  may be formed by stacking a cover film on the shielding layer  500  formed on the body  100 . As another example, the cover layer  700  may be formed on the first to fifth surfaces of the body  100  by forming an insulating material by vapor deposition such as chemical vapor deposition (CVD), or the like. 
     The cover layer  700  may have an adhesive function. As an example, the cover film may include an adhesive component to be bonded to the shielding film in the shielding sheet including the insulating film, the shielding film, and the cover film. 
     The cover layer  700  may be formed in a thickness range of 10 nm to 100 μm. When a thickness of the cover layer  700  is less than 10 nm, an insulation property may be weak, such that a short-circuit between an external electronic component and the coil component may occur, and when a thickness of the cover layer  700  exceeds 100 μm, an entire length, width, and thickness of the coil component may be increased, which is disadvantageous for thinness of the coil component. 
     The sum of the thicknesses of the insulating layer  600 , the shielding layer  500 , and the cover layer  700  may exceed 30 nm and be 100 μm or less. When the sum of the thicknesses of the insulating layer  600 , the shielding layer  500 , and the cover layer  700  is less than 30 nm, a problem such as an electrical short-circuit, a decrease in characteristics of the coil component such as a Q factor, and the like, may occur, and when the sum of the thicknesses of the insulating layer  600 , the shielding layer  500 , and the cover layer  700  exceeds 100 μm, the entire length, width, and thickness of the coil component may be increased, which is disadvantageous for thinness of the coil component. 
     Meanwhile, in forming the cover layer  700 , the cover layer  700  may be formed to expose the other ends of the sidewall portions  521 ,  522 ,  523 , and  524  due to tolerances or characteristics of a forming method. In this case, it is likely m that the shielding layer  500  will be electrically connected to the external electrodes  300  and  400 . Therefore, in the present disclosure, the gap portion G between the sidewall portions  521 ,  522 ,  523 , and  524  and the sixth surface of the body  100  may solve the problem described above. 
     The gap portion G may be formed in the insulating layer  600 , the sidewall portions  521 ,  522 ,  523 , and  524 , and the cover portion  700  to expose portions of walls of the body  100 . In the present exemplary embodiment, the connected portions  310  and  410  of the external electrodes  300  and  400  may be formed on the first and second surfaces of the body  100 , respectively. Therefore, the gap portion G may externally expose at least portions of the connected portions  310  and  410  and the third and fourth surfaces of the body  100 . 
     The gap portion G may allow the other end of each of the sidewall portions  521 ,  522 ,  523 , and  524  to be spaced apart from the sixth surface of the body  100 , which is the mounting surface of the coil component  1000 . More specifically, lower surfaces of the extending portions  320  and  420  of the external electrodes  300  and  400  may be spaced apart from the sixth surface of the body  100  by a predetermined distance. As an example, when the coil component  1000  is mounted on the printed circuit board, or the like, solders, or the like, may go up along the connected portions  310  and  410 . However, the gap portion G may be formed on the other ends of the sidewall portions  521 ,  522 ,  523 , and  524  to prevent the sidewall portions  521 ,  522 ,  523 , and  524  and the external electrodes  300  and  400  from being electrically connected to each other by the solders, or the like. 
     Meanwhile, although not illustrated in  FIGS. 1 through 3 , a separate additional insulating layer distinguished from the insulating layer  600  may be formed on regions of the first to sixth surfaces of the body  100  on which the external electrodes  300  and  400  are not formed. That is, the separate additional insulating layer distinguished from the insulating layer  600  may be formed on the third to fifth surfaces of the body  100  and on a region of the sixth surface of the body on which the extending portions  320  and  420  are not formed. In this case, the insulating layer  600  according to the present exemplary embodiment may be formed on the surfaces of the body  100  to be in contact with the additional insulating layer. The additional insulating layer may serve as a plating resist in forming the external electrodes  300  and  400  by plating, but is not limited thereto. 
     Since the insulating layer  600  and the cover layer  700  according to the present disclosure are disposed in the coil component itself, the insulating layer  600  and the cover layer  700  may be distinguished from a molding material molding the coil component and the printed circuit board in a process of mounting the coil component on the printed circuit board. Therefore, the insulating layer  600  according to the present disclosure may not be in contact with the printed circuit board, and may not be supported and fixed by the printed circuit board unlike the molding material. In addition, unlike the molding material surrounding connection members such as solder balls connecting the coil component and the printed circuit board to each other, the insulating layer  600  and the cover layer  700  according to the present disclosure may not be formed to surround the connection members. In addition, since the insulating layer  600  according to the present disclosure is not the molding material formed by heating an epoxy molding compound (EMC), or the like, moving the EMC onto the printed circuit board, and then hardening the EMC, generation of voids at the time of forming the molding material, occurrence of warpage of the printed circuit board due to a difference between a coefficient of thermal expansion (CTE) of the molding material and a CTE of the printed circuit board, and the like, need not to be considered. 
     In addition, since the shielding layer  500  according to the present disclosure is disposed in the coil component itself, the shielding layer  500  may be distinguished from a shield can coupled to the printed circuit board in order to shield electromagnetic interference (EMI), or the like, after the coil component is mounted on the printed circuit board. As an example, it may not be considered to connect the shielding layer  500  according to the present disclosure to a ground layer of the printed circuit board, unlike the shield can. 
     In the coil component according to the present exemplary embodiment, the shielding layer  500  is formed in the coil component itself, but the gap portion G may be formed in the sidewall portions  521 ,  522 ,  523 , and  524 , to prevent an electrical short-circuit between the shielding layer  500  and the external electrodes  300  and  400  while blocking leaked magnetic fluxes generated in the coil component. In accordance with thinness and performance improvement of an electronic device, the total number of electronic components included in the electronic device and a distance between adjacent electronic components has decreased. However, in the present disclosure, the respective coil components themselves may be shielded, such that leaked magnetic fluxes generated in the respective coil components may be more efficiently blocked, which may be more advantageous for thinness and performance improvement of the electronic device. In addition, an amount of effective magnetic material in a shielding region may be increased as compared to a case of using the shield can, and characteristics of the coil component may thus be improved. 
     In addition, in the coil component according to the present exemplary embodiment, the magnetic fluxes leaked to the third and fourth surfaces of the body  100  opposing each other in the width direction may be made substantially the same as each other, such that directivity does not need to be considered in mounting the coil component on the printed circuit board, or the like. Therefore, the coil component may be more simply and efficiency mounted in a mounting process, a packaging process, or the like. 
     Second Exemplary Embodiment 
       FIG. 5  is a cross-sectional view illustrating a coil component according to a second exemplary embodiment in the present disclosure and corresponding to the cross-sectional view taken along line I-I′ of  FIG. 1 . 
     Referring to  FIGS. 1 through 5 , a coil component  2000  according to the present exemplary embodiment may be different in a cap portion  510  from the coil component  1000  according to the first exemplary embodiment in the present disclosure. Therefore, in describing the present exemplary embodiment, only the cap portion  510  different from that of the first exemplary embodiment in the present disclosure will be described. The description in the first exemplary embodiment in the present disclosure may be applied to other components of the present exemplary embodiment as it is. 
     Referring to  FIG. 5 , a central portion of the cap portion  510  may be formed at a thickness T 1  greater than a thickness T 2  of an outer side portion thereof. This will be described in detail. 
     The respective coil patterns  211  and  212  constituting the coil portion  200  according to the present exemplary embodiment may form a plurality of turns from the center of the internal insulating layer IL to an outer side of the internal insulating layer IL on opposite surfaces of the internal insulating layer IL, respectively, and may be stacked in the thickness direction (T) of the body  100  and be connected to each other by the via  220  (shown in  FIG. 3 ). Resultantly, in the coil component  2000  according to the present exemplary embodiment, a magnetic flux density may be highest at a central portion of a length direction (L)-width direction (W) plane of the body  100  perpendicular to the thickness direction (T) of the body  100 . Therefore, in the present exemplary embodiment, in forming the cap portion  510  disposed on the fifth surface of the body  100  substantially parallel with the length direction (L)-width direction (W) plane of the body  100 , the central portion of the cap portion  510  may be formed at the thickness T 1  greater than the thickness T 2  of the outer side portion thereof in consideration of a magnetic flux density distribution on the length direction (L)-width direction (W) plane of the body  100 . 
     In this way, in the coil component  2000  according to the present exemplary embodiment, a leaked magnetic flux may be more efficiency decreased depending on the magnetic flux density distribution. 
     Third Exemplary Embodiment 
       FIG. 6  is a cross-sectional view illustrating a coil component according to a third exemplary embodiment in the present disclosure and corresponding to the cross-sectional view taken along line I-I′ of  FIG. 1 .  FIG. 7  is a cross-sectional view illustrating a coil component according to a modified example of a third exemplary embodiment in the present disclosure and corresponding to the cross-sectional view taken along line I-I′ of  FIG. 1   
     Referring to  FIGS. 1 through 7 , a coil component  3000  according to the present exemplary embodiment and a coil component  3000 ′ according to the modified example of the present exemplary embodiment may be different in a cap portion  510  and sidewall portions  521 ,  522 ,  523 , and  524  from the coil components  1000  and  2000  according to the first and second exemplary embodiments in the present disclosure. Therefore, in describing the present exemplary embodiment and the modified example of the present exemplary embodiment, only the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  different from those of the first and second exemplary embodiments in the present disclosure will be described. The description in the first and second exemplary embodiments in the present disclosure may be applied to other components of the present exemplary embodiment and the modified example of the present exemplary embodiment as it is. 
     Referring to  FIG. 6 , a thickness T 3  of the cap portion  510  may be greater than a thickness T 4  of each of the sidewall portions  521 ,  522 ,  523 , and  524 . 
     As described above, the coil portion  200  may generate a magnetic field in the thickness direction (T) of the body  100 . Resultantly, a magnetic flux leaked in the thickness direction (T) of the body  100  may be greater than those leaked in other directions. Therefore, the cap portion  510  disposed on the fifth surface of the body  100  perpendicular to the thickness direction (T) of the body  100  may be formed at a thickness greater than that of each of the sidewall portions  521 ,  522 ,  523 , and  524  disposed on walls of the body  100  to more efficiently decrease the leaked magnetic flux. 
     As an example, the cap portion  510  may be formed at the thickness greater than that of each of the sidewall portions  521 ,  522 ,  523 , and  524  by forming a shielding layer on the first to fifth surfaces of the body  100  using a shielding sheet including an insulating film and a shielding film and additionally forming a shielding material on only the fifth surface of the body  100 . As another example, the cap portion  510  may be formed at the thickness greater than that of each of the sidewall portions  521 ,  522 ,  523 , and  524  by disposing the body  100  so that the fifth surface of the body  100  faces a target and then performing sputtering for forming the shielding layer  500 . However, the scope of the present exemplary embodiment is not limited to the example described above. 
     Referring to  FIG. 7 , a thickness T 5  of one end of each of the sidewall portions  521 ,  522 ,  523 , and  524  may be greater than that of the other end of the sidewall portion  520 . 
     As an example, when the cap portion  510  and the sidewall portions  521 ,  522 ,  523 , and  524  are formed by plating, a current density may be concentrated due to edged shapes in edge portions of the body  100  at which the fifth surface of the body  100  and the first to fourth surfaces of the body  100  are connected to each other, that is, regions in which one end of the sidewall portion  520  is formed. Therefore, one end of the sidewall portion  520  may be formed at a thickness relatively greater than that of the other end of the sidewall portion  520 . As another example, one end of the sidewall portion  520  may be formed at a thickness relatively greater than that of the other end of the sidewall portion  520  by disposing the body  100  so that the fifth surface of the body  100  faces a target and then performing sputtering for forming the shielding layer  500 . However, the scope of the present modified example is not limited to the example described above. 
     Fourth Exemplary Embodiment 
       FIG. 8  is a schematic perspective view illustrating a coil component according to a fourth exemplary embodiment in the present disclosure.  FIG. 9  is a cross-sectional view taken along an LT plane of  FIG. 8 . 
     Referring to  FIGS. 1 through 9 , a coil component  4000  according to the present exemplary embodiment may be different in a structure of a shielding layer  500  from the coil components  1000 ,  2000 , and  3000  according to the first to third exemplary embodiments in the present disclosure. Therefore, in describing the present exemplary embodiment, only the shielding layer  500  different from those of the first to third exemplary embodiments in the present disclosure will be described. The description in the first to third exemplary embodiments in the present disclosure may be applied to other components of the present exemplary embodiment as it is. 
     In detail, in the present exemplary embodiment, the shielding layer  500  may include only a cap portion  510 . 
     As described above in another exemplary embodiment in the present disclosure, in the coil portion  200 , the largest leaked magnetic flux may be generated in the thickness direction (T) of the body  100 . Therefore, in the present exemplary embodiment, the shielding layer  500  may be formed on only the fifth surface of the body  100  perpendicular to the thickness direction (T) of the body  100  to more simply and efficiently block the leaked magnetic flux. 
     Meanwhile, although a case in which the external electrodes  300  and  400  used in the present disclosure are L-shaped electrodes including the connected portions  310  and  410  and the extending portions  320  and  420 , respectively, has been described in the exemplary embodiments in the present disclosure described above, this is only for convenience of explanation, and the external electrodes  300  and  400  may be modified into various forms. As an example, the external electrodes  300  and  400  are not formed on the first and second surfaces of the body  100 , respectively, but may be formed on only the sixth surface of the body  100  and be connected to the coil portion  200  through via electrodes, or the like. As another example, the external electrodes  300  and  400  may be ⊏-shaped electrodes including connected portions formed on the first and second surfaces of the body, respectively, extending portions extending from the connected portions and disposed on the sixth surface of the body  100 , and band portions extending from the connected portions and disposed on the fifth and sixth surfaces of the body  100 . As another example, the external electrodes  300  and  400  may be five-sided electrodes including connected portions formed on the first and second surfaces of the body  100 , respectively, extending portions extending from the connected portions and disposed on the sixth surface of the body  100 , and band portions extending from the connected portions and disposed on the third to fifth surfaces of the body  100 . 
     In addition, a case in which a structure of the coil portion is a thin film type coil in which the coil patterns are formed by the plating, the sputtering, or the like, has been described in the exemplary embodiments in the present disclosure described above, but a multilayer coil and a vertical disposition type coil may also be included in the scope of the present disclosure. The multilayer coil refers to a coil formed by applying a conductive paste to the respective magnetic sheets and then stacking, hardening, and sintering a plurality of magnetic sheets to which the conductive paste is applied. The vertical disposition type coil refers to a coil of which a coil pattern has a turn formed perpendicular to a lower surface of a coil component, which is a mounting surface. 
     As set forth above, according to an exemplary embodiment in the present disclosure, a leaked magnetic flux of the coil component may be decreased. 
     In addition, magnetic fluxes leaked to opposite end surfaces may be made relatively uniform. 
     While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present invention as defined by the appended claims.