Patent Publication Number: US-11664153-B2

Title: Coil component

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims benefit of priority to Korean Patent Application No. 10-2018-0147489 filed on Nov. 26, 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 typical passive electronic component used in electronic devices, along with a resistor and a capacitor. 
     With higher performance and smaller sizes gradually implemented in electronic devices, coil components used in electronic devices have been increasing in number and becoming smaller. 
     In the case of a thin film type inductor, a magnetic composite sheet including magnetic metal powder particles is stacked and cured on a substrate on which a coil portion is formed using a plating process, to form a body, and external electrodes are formed on a surface of the body. 
     In order to reduce thicknesses of the components, the external electrodes may be formed using a plating process. In this case, a magnetic metal powder particle exposed from the surface of the body may cause plating blur. 
     SUMMARY 
     An aspect of the present disclosure is to provide a coil component capable of preventing deteriorations in reliability due to plating blur in a plating process for forming external electrodes. 
     Another aspect of the present disclosure is to provide a coil component which may be lighter, thinner, shorter, and smaller. 
     Another aspect of the present disclosure is to provide a coil component having an improved breakdown voltage (BDV) by increasing an insulation distance between external electrodes. 
     According to an aspect of the present disclosure, a coil component includes a body having one surface and the other surface opposing each other, having a plurality of wall surfaces respectively connecting the one surface and the other surface, and including a magnetic metal powder particle and an insulating resin; a coil portion embedded in the body and having end portions respectively exposed from end surfaces opposing each other, among the plurality of wall surfaces of the body; first and second external electrodes arranged to be spaced apart from each other on the one surface of the body and extending to the end surfaces of the body to be connected to both end portions of the coil portion, respectively; an external insulating layer disposed between each of the first and second external electrodes and the one surface of the body; and a cover insulating layer disposed on the other surface of the body and the plurality of wall surfaces of the body, to cover at least a portion of each of the first and second external electrodes. A magnetic metal powder particle exposed on the wall surface of the body, among the magnetic metal powder particle, has a plating prevention film disposed on at least a portion of a surface of the exposed magnetic metal powder particle and including metal ions of the magnetic metal powder particle. 
     According to an aspect of the present disclosure, a coil component includes a body comprising a magnetic metal powder particle and an insulating resin; a coil portion embedded in the body; first and second external electrodes arranged to be spaced apart from each other on one surface of the body, and extending to end surfaces of the body to be connected to end portions of the coil portion, respectively; and an external insulating layer disposed between each of the first and second external electrodes and the one surface of the body. An oxide film is at least partially embedded in the body and covers only a portion of the magnetic metal powder particle, and the magnetic metal powder particle covered by the oxide film is spaced apart from the one surface of the body. 
    
    
     
       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 view illustrating a coil component according to a first embodiment of 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 an enlarged view of portion A of  FIG.  1   ; 
         FIG.  5    is an enlarged view of portion B of  FIG.  4   ; 
         FIG.  6    is a schematic view illustrating a coil component according to a second embodiment of the present disclosure, corresponding to a cross-section taken along line I-I′ of  FIG.  1   ; and 
         FIG.  7    is a schematic view illustrating a coil component according to a third embodiment of the present disclosure, corresponding to a cross-section taken along line I-I′ of  FIG.  1   . 
     
    
    
     DETAILED DESCRIPTION 
     The terms used in the description of the present disclosure are used to describe a specific embodiment, and are not intended to limit the present disclosure. A singular term includes a plural form unless otherwise indicated. The terms “include,” “comprise,” “is configured to,” etc. of the description of the present disclosure are used to indicate the presence of features, numbers, steps, operations, elements, parts, or combination thereof, and do not exclude the possibilities of combination or addition of one or more additional features, numbers, steps, operations, elements, parts, or combination thereof. Also, the terms “disposed on,” “positioned on,” and the like, may indicate that an element is positioned on or beneath an object, and does not necessarily mean that the element is positioned above the object with reference to a gravity direction. 
     The term “coupled to,” “combined to,” and the like, may not only indicate that elements are directly and physically in contact with each other, but also include the configuration in which another element is interposed between the elements such that the elements are also in contact with the other component. 
     Sizes and thicknesses of elements illustrated in the drawings are indicated as examples for ease of description, and the present disclosure are not limited thereto. 
     In the drawings, an L direction is a first direction or a length (longitudinal) direction, a W direction is a second direction or a width direction, a T direction is a third direction or a thickness direction. 
     Hereinafter, a coil component according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. Referring to the accompanying drawings, the same or corresponding components may be denoted by the same reference numerals, and overlapped descriptions will be omitted. 
     In electronic devices, various types of electronic components may be used, and various types of coil components may be used between the electronic components to remove noise, or for other purposes. 
     In other words, in electronic devices, a coil component may be used as a power inductor, a high frequency (HF) inductor, a general bead, a high frequency (GHz) bead, a common mode filter, and the like. 
     First Embodiment 
       FIG.  1    is a schematic view illustrating a coil component according to a first embodiment of 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 an enlarged view of portion A of  FIG.  1   .  FIG.  5    is an enlarged view of portion B of  FIG.  4   . 
     Referring to  FIGS.  1  to  5   , a coil component  1000  according to an embodiment of the present disclosure may include a body  100 , an inner insulating layer  200 , a coil portion  300 , external electrodes  400  and  500 , and an insulation film  600 . 
     The body  100  may form an exterior of the coil component  1000  according to this embodiment, and the coil portion  300  may be embedded therein. 
     The body  100  may be formed to have a hexahedral shape overall. 
     Referring to  FIGS.  1  to  3   , the body  100  may include a first surface  101  and a second surface  102  opposing each other in a longitudinal direction L, a third surface  103  and a fourth surface  104  opposing each other in a width direction W, and a fifth surface  105  and a sixth surface  106  opposing each other in a thickness direction T. Each of the first to fourth surfaces  101 ,  102 ,  103 , and  104  of the body  100  may correspond to wall surfaces of the body  100  connecting the fifth surface  105  and the sixth surface  106  of the body  100 . Hereinafter, both end surfaces of the body  100  may refer to the first surface  101  and the second surface  102  of the body, and both side surfaces of the body  100  may refer to the third surface  103  and the fourth surface  104  of the body. Further, one surface and the other surface of the body  100  may refer to the sixth surface  106  and the fifth surface  105  of the body  100 , respectively. 
     The body  100  may be formed such that the coil component  1000  according to this embodiment in which the external electrodes  400  and  500  to be described later are formed has a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.65 mm, but is not limited thereto. 
     The body  100  may include magnetic metal powder particles  20  and  30  and an insulating resin  10 , and may have an internal portion  110  and an outer portion  120  constituting first to fifth surfaces  101 ,  102 ,  103 ,  104  and  105  of the internal portion  110 . 
     Specifically, the body  100  may be formed using stacking at least one magnetic composite sheet containing the insulating resin  10  and the magnetic metal powder particles  20  and  30  dispersed in the insulating resin  10 . 
     The magnetic metal powder particles  20  and  30  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 magnetic metal powder particles  20  and  30  may be at least one or more of a pure iron powder, a Fe—Si-based alloy powder, a Fe—Si—Al-based alloy powder, a Fe—Ni-based alloy powder, a Fe—Ni—Mo-based alloy powder, a Fe—Ni—Mo—Cu-based alloy powder, a Fe—Co-based alloy powder, a Fe—Ni—Co-based alloy powder, a Fe—Cr-based alloy powder, a Fe—Cr—Si-based alloy powder, a Fe—Si—Cu—Nb-based alloy powder, a Fe—Ni—Cr-based alloy powder, and a Fe—Cr—Al-based alloy powder. 
     The magnetic metal powder particles  20  and  30  may be amorphous or crystalline. For example, the magnetic metal powder particles  20  and  30  may be a Fe—Si—B—Cr-based amorphous alloy powder, but are not limited thereto. The magnetic metal powder particles  20  and  30  may have an average diameter of 0.1 μm to 30 μm, respectively, but are not limited thereto. 
     The magnetic metal powder particles  20  and  30  may include a first powder particle  20  and a second powder particle  30  having a particle diameter smaller than a particle diameter of the first powder particle  20 . In the present specification, the term “particle diameter” refers to a particle size distribution represented by D 90  or D 50 . In the case of the present disclosure, since the magnetic metal powder particles  20  and  30  include the first powder particle  20  and the second powder particle  30  having a particle diameter smaller than that of the first powder particle  20 , the second powder particle  30  may be disposed in a space between the first powder particles  20  to improve a filling ratio of the magnetic material in the body  100 . 
     The insulating resin  10  may include an epoxy, a polyimide, a liquid crystal polymer, or the like, in a single form or in combined forms, but is not limited thereto. 
     The outer portion  120  may constitute the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 . The outer portion  120  may be formed to surround the upper surface and the four side surfaces of the internal portion  110  except for the lower surface of the internal portion  110 , based on the directions of  FIGS.  1  to  3   . The internal portion  110  and the outer portion  120  of the body  100  may be not formed as separate members. For example, the outer portion  120  may be a region of the body  100  corresponding to an etching depth of an acid solution in an acid treatment, which will be described later, and may be described to be distinguished from the internal portion  110 . As a non-limiting example, the outer portion  120  may be defined as a depth of about 1.5 times than a particle size of the first powder particle  20 , described above, from each of the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 . Since the external insulating layer  700  to be described later is disposed on the sixth surface  106  of the body  100  during the acid treatment process for forming the outer portion  120  in this embodiment, the external insulating layer  700  may prevent the acid solution applied in the acid treatment process from permeating to a portion of the body  100  covered by the external insulating layer  700 . As such, a portion of the body  100  within a depth of, for example, 1.5 times a particle size of the first powder particle  20 , from the external insulating layer may not have properties corresponding to the outer portion  120 . Such a portion of the body  100  may have properties the same as, or similar to, those of the internal portion  110 . That is, the outer portion  120  may be formed only on the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 . The outer portion  120  of the present disclosure may be distinguished from the technique that a separate insulating layer is stacked or coated on the surface of the body  100 , after the formation of the body  100 . The acid solution for forming the outer portion  120  may react with the magnetic metal powder particles  20  and  30 , and may not react with both end portions of the coil portion  300  exposed from the first and second surfaces  101  and  102  of the body  100 . 
     The magnetic metal powder particles  20  and  30  disposed in the outer portion  120  may have a plating prevention film  21  on at least a portion of a surface of each of the magnetic metal powder particles  20  and  30 . For example, the magnetic metal powder particles  20  and  30  exposed from the first to fourth surfaces  101 ,  102 ,  103 , and  104  of the body  100 , among the magnetic metal powder particles  20  and  30  disposed in the outer portion  120 , may have a plating prevention film  21  on at least a portion of a surface of each of the magnetic metal powder particles  20  and  30 . The magnetic metal powder particles  20  and  30  which may be covered with the insulating resin  10  and may not be exposed from the surface of the body  100 , among the magnetic metal powder particles  20  and  30  disposed in the outer portion  120 , may also have a plating prevention film  21  on at least a portion of a surface of each of the magnetic metal powder particles  20  and  30 . The latter case may be because an acidic solution passes through to a boundary between the outer portion  120  and the internal portion  110  in the body  100  in an acid treatment of the body  100  due to a porous structure of the insulating resin  10 , one portion of the body  100 . 
     Since a particle diameter of the first powder particle  20  is greater than a particle diameter of the second powder particle  30 , the plating prevention film  21  may be formed on a surface of the first powder particle  20  in general. For example, both the first powder particle  20  and the second powder particle  30  may be exposed from the surface of the body  100 , but the second powder particle  30  exposed from the surface of the body  100  may be dissolved in an acidic solution during an acid treatment due to a relatively small particle diameter of the second powder particle  30 . The second powder particle  30  may be dissolved in the acidic solution to form voids V in the insulating resin  10  of the outer portion  120 . As a result, a volume of each of the voids V formed in the insulating resin  10  of the outer portion  120  may correspond to a volume of the second powder particle  30  remaining in the insulating resin  10  of the outer portion  120 . As described above, since the particle diameter of the second powder particle  30  refers to the particle diameter distribution, the volume of the second powder particle  30  means volume distribution. Therefore, the volume of the voids V corresponding to the volume of the second powder particle  30  refers to the fact that the volume distribution in the volume of the voids is substantially equal to the volume distribution in the volume of the second powder particle. 
     The plating prevention film  21  may be formed using reacting the magnetic metal powder particles  20  and  30  of the outer portion  120  with the acid. The plating prevention film  21  may include, or may be, an oxide of a metal magnetic component constituting the magnetic metal powder particles and be formed by oxidizing the magnetic metal powder particles  20  and  30  by the acid. Therefore, the plating prevention film  21  may be discontinuously formed on each of the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 . That is, the plating prevention film  21  may be distributed on the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100  according to a distribution of the magnetic metal powder particles  20  or a distribution of the magnetic metal powder particles  20  and  30  on the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 . In addition, a concentration of oxygen ions in the plating prevention film  21  may be reduced toward a center of each of the magnetic metal powder particles  20  and  30  from the outside. For example, since the surface of each of the magnetic metal powder particles  20  and  30  is exposed to the acid solution for a period longer than that of the center of each of the magnetic metal powder particles  20  and  30 , the concentration of oxygen ions in the plating prevention film  21  may vary, depending on a depth of the plating prevention film  21 . As a result, cracks CR may be formed in the plating prevention film  21 , due to unbalance of metal ions or the like by the oxidation-reduction reaction. A thickness of the plating prevention film  21  on one of the magnetic metal powder particles  20  and  30  may decrease in a direction from the surface of the body  100  to an inner portion of the body  100 . For example, the thickness of the plating prevention film  21  on one of the magnetic metal powder particles  20  and  30  may decrease in a direction substantially perpendicular to the surface of the body  100 . In one example, the plating prevention film  21  may cover a first portion of one of the magnetic metal powder particles  20  and  30  and may not cover a second portion of the one of the magnetic metal powder particles  20  and  30  which is farther away from the surface as compared to the first portion. The plating prevention film  21  of the present disclosure may be distinguished from technique in which a separate oxide film is applied or coated on the magnetic metal powder particles  20  and  30 . 
     Since the plating prevention film  21  contains metal ions and oxygen ions of the magnetic metal powder particles  20  and  30 , the plating insulation film  21  may be excellent in electrical insulation. Therefore, in forming a plating layer on the external electrodes  400  and  500  to be described later, a plating blurring phenomenon and the like may be prevented without forming a separate plating resist on the surface of the body  100 . 
     The plating prevention film  21  may be formed on a cut surface of each of the magnetic metal powder particles  20  and  30 . The cut surface may be a flat surface intersecting the curved outer surface of the remaining portion of the magnetic metal powder particle  20 . The coil component  1000  according to this embodiment may form a plurality of unit coils on a substrate of a strip level or a panel level, may stack the magnetic composite sheets, and may then dice the substrate to individualize a plurality of components. In this case, a dicing tip may cut the plurality of components along a dicing line, and the magnetic metal powder particles  20  and  30  arranged on the dicing line may be cut by the dicing tip, to have the cut surface. For the above reason, the cut surface of the magnetic metal powder particles  20  and  30  may be exposed from the first to fourth surfaces  101 ,  102 ,  103 , and  104  of the body  100 , and the plating prevention film  21  may be formed on the cut surface of the magnetic metal powder particles  20  and  30  after the acid treatment. In one example, the dicing operation may not be performed to the fifth surface  105 , and thus, the magnetic metal powder particles  20  and  30  having a cut surface may be exposed from only the first to fourth surfaces  101 ,  102 ,  103 , and  104  of the body  100 , and are spaced apart from the fifth and sixth surfaces  105  and  106 . 
     A thickness of the plating prevention film  21  may be more than 0 μm and 20 μm or less. Here, the thickness of the plating prevention film  21  may refer to a thickness of the plating prevention film  21  on a portion of one of the magnetic metal powder particles  20  and  30  facing the surface of the body or exposed from the body  100 . When the thickness of the plating prevention film is more than 20 μm, the magnetic properties of the first powder particle  20  may be deteriorated. 
     As illustrated in  FIG.  4   , the plating prevention film  21  may be formed on the entire surface of any one of the magnetic metal powder particles  20  and  30  disposed on the outer portion  120 , or may be formed only on a region of any one of the magnetic metal powder particles  20  and  30 . 
     The body  100  may include a magnetic core C passing through the coil portion  300  to be described later. The magnetic core C may be formed by filling the through-holes of the coil portion  300  with the magnetic composite sheet, but is not limited thereto. 
     The inner insulating layer  200  may be embedded in the body  100 . The inner insulating layer  200  may be configured to support the coil portion  300  to be described later. 
     The inner insulating layer  200  may be formed of an insulating material including a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as polyimide, or a photosensitive insulating resin, or may be formed of an insulating material in which a reinforcing material such as a glass fiber or an inorganic filler is impregnated with such an insulating resin. For example, the inner insulating layer  200  may be formed of an insulating material such as prepreg, Ajinomoto Build-up Film (ABF), FR-4, a bismaleimide triazine (BT) resin, a photoimageable dielectric (PID), a copper clad laminate (CCL), and the like, but are not limited thereto. 
     As the inorganic filler, at least one or more selected from a group consisting of silica (SiO 2 ), alumina (Al 2 O 3 ), silicon carbide (SiC), barium sulfate (BaSO 4 ), talc, mud, a mica powder, aluminium hydroxide (Al(OH) 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 inner insulating layer  200  is formed of an insulating material including a reinforcing material, the inner insulating layer  200  may provide better rigidity. When the inner insulating layer  200  is formed of an insulating material not containing glass fibers, the inner insulating layer  200  may be advantageous for reducing a thickness of the overall coil portion  300 . When the inner insulating layer  200  is formed of an insulating material containing a photosensitive insulating resin, the number of processes for forming the coil portion  300  may be reduced. Therefore, it may be advantageous in reducing production costs, and a fine via may be formed. 
     The coil portion  300  may be embedded in the body  100  to manifest the characteristics of the coil portion. For example, when the coil component  1000  of this embodiment is used as a power inductor, the coil portion  300  may function to stabilize the power supply of an electronic device by storing an electric field as a magnetic field and maintaining an output voltage. 
     The coil portion  300  may be formed on at least one of both surfaces of the inner insulating layer  200 , and may form at least one turn. In this embodiment, the coil portion  300  may include first and second coil patterns  311  and  312  formed on both surfaces of the inner insulation layer  200  opposing each other in the thickness direction T of the body  100 , and a via  320  passing through the inner insulating layer  200  to connect the first and second coil patterns  311  and  312  to each other. 
     Each of the first coil pattern  311  and the second coil pattern  312  may have a spiral planar shape forming at least one turn with reference to the magnetic core C. For example, the first coil pattern  311  may format least one turn with reference to the magnetic core C on a lower surface of the inner insulating layer  200  and the second coil pattern  312  may form at least one turn with reference to the magnetic core C on an upper surface of the inner insulation layer  200 , based on the direction of  FIG.  3   . 
     End portions of the first and second coil patterns  311  and  312  may be connected to the first and second external electrodes  400  and  500 , respectively, which will be described later. For example, the end portions of the first coil pattern  311  may be connected to the first external electrode  400 , and the end portions of the second coil pattern  312  may be connected to the second external electrode  500 . 
     As an example, the end portions of the first coil pattern  311  may extend to be exposed from the first surface  101  of the body  100 , and the end portions of the second coil pattern  312  may extend to be exposed from the second surface  102  of the body  100 , to be in contact with and be connected to the first and second external electrodes  400  and  500 , formed on the first and second surfaces  101  and  102  of the body  100 , respectively. In this case, each of the coil patterns  311  and  312  including the end portions may be integrally formed. 
     At least one of the coil patterns  311  and  312 , and the via  320  may include at least one conductive layer. 
     For example, when the second coil pattern  312  and the via  320  are formed on a side of the other surface of the inner insulating layer  200  by a plating process, the second coil pattern  312  and the via  320  may be formed using a seed layer of electroless plating layers, or the like, and an electroplating layer. In this case, each of the seed layer and the electroplating layer may have a single-layer structure or a multilayer structure. The electroplating layer of the multilayer structure may be formed using a conformal film structure in which one electroplating layer is covered by another electroplating layer, and another electroplating layer is only stacked on one side of the one electroplating layer, or the like. The seed layer of the second coil pattern  312  and the seed layer of the via  320  may be integrally formed, and no boundary therebetween may occur, but are not limited thereto. The electroplating layer of the second coil pattern  312  and the electroplating layer of the via  320  may be integrally formed, and no boundary therebetween may occur, but are not limited thereto. 
     As another example, referring to  FIGS.  2  and  3   , when the first coil pattern  311  disposed on a side of the lower surface of the inner insulating layer  200  and the second coil pattern  311  disposed on a side of the upper surface of the inner insulating layer  200  are separately formed, and are then stacked on the inner insulating layer  200  in a batch, the via  320  may include a high melting point metal layer, and a low melting point metal layer having a melting point lower than a melting point of the high melting point metal layer. In this case, the low melting point metal layer may be formed of a solder containing lead (Pb) and/or tin (Sn). The low melting point metal layer may be melted at least in part due to the pressure and the temperature at the time of stacking in a batch. As a result, an intermetallic compound (IMC) layer may be formed at least at a portion of a boundary between the low melting point metal layer and the second coil pattern  312 , and a boundary between the low melting point metal layer and the high melting point metal layer. 
     The coil patterns  311  and  312  may protrude from both surfaces of the inner insulating layer  200 , for example, based on the directions of  FIGS.  2  and  3   . As another example, based on the directions of  FIGS.  2  and  3   , the first coil pattern  311  may protrude from one surface of the inner insulating layer  200 , the second coil pattern  312  may be embedded in the other surface of the inner insulating layer  200 , to expose one surface of the second coil pattern  312  from the other surface of the inner insulating layer  200 . In this case, since a recess may be formed in the one surface of the second coil pattern  312 , the other surface of the inner insulating layer  200  and the one surface of the second coil pattern  312  may not be located on the same plane. As another example, based on the directions of  FIGS.  2  and  3   , the second coil pattern  312  may protrude from the other surface of the inner insulating layer  200 , and the first coil pattern  311  may be embedded in one surface of the inner insulating layer  200 , to expose one surface of the first coil pattern  311  from the one surface of the inner insulating layer  200 . In this case, since a recess may be formed in the one surface of the first coil pattern  312 , the one surface of the inner insulating layer  200  and the one surface of the first coil pattern  312  may not be located on the same plane. 
     Each of the coil patterns  311  and  312  and the via  320  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 are not limited thereto. 
     The external electrodes  400  and  500  may be disposed to be spaced from each other on the sixth surface  106  of the body  100 , and may be connected to both end portions of the coil portion  300 , respectively. In particular, the first external electrode  400  may include a first connection portion  410  disposed on the first surface  101  of the body  100  and connected to an end portion of the first coil pattern  311 , and a first pad portion  420  extending from the first connection portion  410  to the sixth surface  106  of the body  100 . The second external electrode  500  may include a second connection portion  510  disposed on the second surface  102  of the body  100  and connected to an end portion of the second coil pattern  312 , and a second pad portion  520  extending from the second connection portion  510  to the sixth surface  106  of the body  100 . Since the first pad portion  410  and the second pad portion  510  respectively disposed on the sixth surface of the body  100  are spaced apart from each other, an electrical short between the first external electrode  400  and the second external electrode  500  may be prevented. 
     The external electrodes  400  and  500  electrically connect the coil component  1000  to a printed circuit board or the like, when the coil component  1000  according to this embodiment is mounted on the printed circuit board or the like. For example, the coil component  1000  according to this embodiment may be mounted such that the sixth surface  106  of the body  100  faces an upper surface of the printed circuit board, the pad portions  420  and  520  of the external electrodes  400  and  500  may be electrically connected to the connection portions of the printed circuit board. 
     The external electrodes  400  and  500  may be formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Ti), titanium (Ti), or alloys thereof, but are not limited thereto. 
     Each of the external electrodes  400  and  500  may be formed in a multilayer structure. For example, each of the external electrodes  400  and  500  may include a first metal layer (L1) disposed to contact the surface of the body  100 , and second metal layers (L2 and L3) arranged on the first metal layer (L1) and thicker than the first metal layer (L1). The first metal layer (L1) may be formed by a vapor deposition process such as sputtering. In this case, at least a portion of metal elements constituting the first metal layer (L1) may pass through the surface of the body. The second metal layers (L2 and L3) may be formed by an electrolytic plating process using the first metal layer (L1) as a seed layer. The second metal layers (L2 and L3) may be formed in a multilayer structure and may include a first plating layer (L2) and a second plating layer (L3) formed on the first plating layer (L2). For example, the first metal layer (L1) may include copper (Cu), the first plating layer (L  2 ) may include nickel (Ni), and the second plating layer (L3) may include tin (Sn). 
     Since the first metal layer (L1) is formed by a vapor deposition process such as sputtering, the first metal layer (L1) may be formed on the first and second surfaces  101  and  102  of the body  100  on which the plating prevention film  21  is formed. As a result, the first metal layer (L1) may be formed to contact both end portions of the coil portion  300 . The plating prevention film  21  may function as a plating resist in forming the first plating layer (L2) and the second plating layer (L3) by an electrolytic plating process. The plating prevention film  21  may prevent plating blur or the like in which the first plating layer (L2) and the second plating layer (L3) are extended to regions, except a region in which the external electrodes  400  and  500  are formed in the surface of the body  100 . 
     The external insulating layer  700  may be disposed between the sixth surface  106  of the body  100  and the first and second external electrodes  400  and  500 . Specifically, the external insulating layer  700  may be disposed on the sixth surface  106  of the body  100 , and the pad portions  420  and  520  of the external electrodes  400  and  500  may be arranged to be spaced apart from each other on the external insulating layer  700 . The external insulating layer  700  may increase the insulation distance between the first and second external electrodes  400  and  500 , to improve breakdown voltage (BDV) of the coil component  1000  according to this embodiment. 
     In addition, the external insulating layer  700  may lower surface roughness of the exposed surfaces of the first and second external electrodes  400  and  500 . For example, since the body  100  shrinks due to heating and pressurization in the forming process, the surface of the body  100  may have a relatively high surface roughness. When external electrodes, which may be relatively thin, are directly formed on a surface of a body, surface roughness of the exposed surface of the external electrodes may be increased. However, in the case of this embodiment, since an external insulating layer  700  may be formed on the sixth surface  106  of the body  100 , and pad portions  420  and  520  of the external electrodes  400  and  500  may be formed on the external insulating layer  700 , the external insulating layer  700  may reduce the relatively high surface roughness of the sixth surface  106  of the body  100  to lower the surface roughness of the exposed surface of the pad portions  420  and  520 . 
     The external insulating layer  700  may include a thermoplastic resin such as a polystyrene-based resin, a vinyl acetate-based resin, a polyester-based resin, a polyethylene-based resin, a polypropylene-based resin, a polyamide-based resin, a rubber-based resin, an acrylic-based resin, or the like, a thermosetting resin such as a phenol-based resin, an epoxy-based resin, a urethane-based resin, a melamine-based resin, an alkyd-based resin, or the like, a photosensitive resin, parylene, SiO x , or SiN x . 
     The external insulating layer  700  may be formed by applying a liquid insulating resin to the sixth surface  106  of the body  100 , by stacking an insulating film on the sixth surface  106  of the body  100 , or by forming an insulating resin on the sixth surface  106  of the body  100 , using a vapor deposition process. In the case of the insulating film, a dry film (DF) containing a photosensitive insulating resin, an Ajinomoto Build-up Film (ABF) containing no photosensitive insulating resin, a polyimide film, or the like may be used. Further, the insulating film may include a reinforcing material such as glass fiber or an inorganic filler, and an insulating resin. When the insulating film is stacked on the surface of the body  100  and the insulating film is heated and pressed to form the external insulating layer  700 , it is advantageous that the exposed surface of the external electrodes  400  and  500  may be formed to be flatter. 
     The external insulating layer  700  may be formed in a thickness range of 10 nm to 100 μm. When the thickness of the external insulating layer  700  is less than 10 nm, the Q characteristic, the breakdown voltage (BDV), the self-resonant frequency (SRF) may decrease to deteriorate the characteristics of the component. When the thickness of the external insulating layer  700  exceeds 100 μm, the thickness of the component may increase, to be disadvantageous for thinning. 
     A cover insulating layer  800  may be disposed on the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100  to cover at least a portion of each of the first and second external electrodes  400  and  500 . Specifically, the cover insulating layer  800  may be disposed on the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 , to cover the connection portions  410  and  510  of the external electrodes  400  and  500 , and to expose the pad portions  420  and  520 . 
     The cover insulating layer  800  may include at least one of a thermoplastic resin such as a polystyrene-based resin, a vinyl acetate-based resin, a polyester-based resin, a polyethylene-based resin, a polypropylene-based resin, a polyamide-based resin, a rubber-based resin or an acrylic-based resin, or the like, a thermosetting resin such as a phenol-based resin, an epoxy-based resin, a urethane-based resin, a melamine-based resin, an alkyd-based resin, or the like, and a photosensitive resin. 
     The cover insulating layer  800  may be formed by stacking an insulating film on the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 , for example. As another example, the cover insulating layer  800  may be formed on the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100  by forming a material using a vapor deposition process such as chemical vapor deposition (CVD). 
     The cover insulating layer  800  may be formed in a thickness range of 10 nm to 100 μm. When the thickness of the cover insulating layer  800  is less than 10 nm, the insulating properties may be deteriorated, and possibility that the connection portions  410  and  510  are electrically short-circuited with other components outside the coil component may increase. When the thickness of the cover insulating layer  800  may be more than 100 μm, the total length and width of the coil component may increase, to be disadvantageous for miniaturization of components. 
     The coil component  1000  according to this embodiment may further include an insulating film  600  formed along the surfaces of the coil patterns  311  and  312 , the inner insulating layer  200 , and the magnetic core C. The insulating film  600  may be for insulating the coil patterns  311  and  312  from the body  100 , and may include a known insulating material such as parylene. An insulating material included in the insulating film  600  may be any insulating material, and is not particularly limited. The insulating film  600  may be formed using a vapor deposition process or the like, but not limited thereto, and may be formed by stacking an insulating film on both surfaces of the inner insulating layer  200 . 
     Second Embodiment 
       FIG.  6    is a schematic view illustrating a coil component according to a second embodiment of the present disclosure, corresponding to a cross-section taken along line I-I′ of  FIG.  1   . 
     Referring to  FIGS.  1  to  6   , a coil component  2000  according to this embodiment may be different from the coil component  1000  according to the first embodiment of the present disclosure, in view of external electrodes  400  and  500 . Therefore, in describing this embodiment, only the external electrodes  400  and  500  different from the first embodiment of the present disclosure will be described. The remaining configuration of this embodiment may be applied, as it is in the first embodiment of the present disclosure. 
     Referring to  FIG.  6   , second metal layers (L2 and L3) of external electrodes  400  and  500  according to this embodiment may not be arranged in a region of a first metal layer (L1) disposed on the first and second surfaces  101  and  102  of the body  100 . For example, second metal layers (L2 and L3) applied to this embodiment may be arranged only on the pad portions  420  and  520  of the external electrodes  400  and  500 , and may not be arranged on the connection portions  410  and  510  of the external electrodes  400  and  500 . 
     A difference between this embodiment and the first embodiment of the present disclosure may be attributed to a sequential relationship between an operation of forming the second metal layers (L2 and L3) and an operation of forming the cover insulating layer  800 . For example, in the case of the first embodiment of the present disclosure, the cover insulating layer  800  may be formed after the second metal layers (L2 and L3) are formed on the body  100 . In this embodiment, after only the metal layer (L1) is formed on the body  100 , the cover insulating layer  800  may be formed, and then the second metal layers (L2 and L3) may be formed by an electrolytic plating process. 
     Third Embodiment 
       FIG.  7    is a schematic view illustrating a coil component according to a third embodiment of the present disclosure, corresponding to a cross-section taken along line I-I′ of  FIG.  1   . 
     Referring to  FIGS.  1  to  7   , a coil component  3000  according to this embodiment may be different from the coil components  1000  and  2000  according to the first and second embodiments of the present disclosure, in view of an external insulating layer  700 . Therefore, in describing this embodiment, only the external insulating layer  700  different from the first and second embodiments of the present disclosure will be described. The remaining configuration of this embodiment may be applied, as it is in the first embodiment or the second embodiment of the present disclosure. 
     Referring to  FIG.  7   , an external insulating layer  700  applied to this embodiment may be also disposed on the fifth surface  105  of the body  100 . For example, the external insulating layer  700  may be disposed on each of the fifth and sixth surfaces  105  and  106  of the body  100 . 
     In this embodiment, after the external insulating layer is disposed on the fifth and sixth surfaces  105  and  106  of the body  100 , an acid treatment process for forming the plating prevention film  21  may be carried out. Therefore, in a different manner to the first embodiment of the present disclosure, an outer portion  120  may constitute only the first to fourth surfaces  101 ,  102 ,  103 , and  104  of the body  100 , not the fifth surface  105  of the body  100 . 
     According to the present disclosure, it is possible to prevent deteriorations in reliability due to plating blur in a plating process for forming external electrodes. 
     In addition, according to the present disclosure, it is possible for the coil component to become lighter, thinner, shorter, and smaller. 
     Also, according to the present disclosure, breakdown voltage (BDV) may be improved by increasing the insulation distance between the external electrodes. 
     While example 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 disclosure as defined by the appended claims.