Patent Publication Number: US-11664148-B2

Title: Coil component

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of priority to Korean Patent Application No. 10-2019-0025796 filed on Mar. 6, 2019 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 
     With the miniaturization and thinning of electronic devices such as digital TVs, mobile phones, notebook PCs and the like, coil components applied to such electronic devices are required to be downsized and thinned. In order to meet such needs, research and development of various coiled type or thin film type coil components are actively proceeding. 
     The major issue in the miniaturization and thinning of coil components is to realize the same characteristics as existing coil components, despite such miniaturization and thinning. In order to satisfy such a demand, it is necessary to increase the filling ratio of the magnetic material in the core filled with the magnetic material. However, there is a limit to increasing the ratio of the magnetic material, due to the strength of the inductor body, the change of the frequency characteristics depending on the insulating properties, and the like. 
     There is increasing demand for array type components having the advantage of reducing the mounting area of coil components. Such array type coil components may have a non-coupled or coupled inductor form or a mixed form thereof, depending on a coupling coefficient or a mutual inductance between a plurality of coil portions. 
     In the coupled inductor, leakage inductance may be related to output current ripple, and mutual inductance may be related to inductor current ripple. For the coupled inductor to have the same output current ripple as an existing non-coupled inductor, the leakage inductance of the coupled inductor should be equal to the inductance of a conventional non-coupled inductor. When the mutual inductance increases, the coupling coefficient (k) may increase, thereby reducing the inductor current ripple. 
     Therefore, when a coupled inductor having the same size as the existing non-coupled inductors has the same output current ripple as the conventional non-coupled inductor and reduces the inductor current ripple, the efficiency may increase without an increase in the mounting area. In order to increase the efficiency of the inductor array chip while maintaining the chip size, a coupled inductor having a large coupling coefficient by increasing mutual inductance may be needed. On the other hand, depending on the needs of the application, coupled inductors having a relatively low coupling coefficient may be required, in which case the coupling coefficient between the coil portions needs to be reduced to an appropriate level. 
     SUMMARY 
     An aspect of the present disclosure is to effectively control the coupling inductance between coil portions in a coil component having a coupled inductor structure. 
     According to an aspect of the present disclosure, a coil component includes a body; a first coil portion disposed inside of the body and having a first core portion; a first external electrode and a second external electrode disposed outside of the body and connected to both ends of the first coil portion, respectively; a second coil portion disposed on the first coil portion in the body and having a second core portion; and a third external electrode and a fourth external electrode disposed outside of the body and connected to both ends of the second coil portion, respectively, wherein the first core portion comprises a first shared core portion overlapping the second core portion and a first non-shared core portion not overlapping the second core portion, and the second core portion comprises a second shared core portion overlapping the first core portion and a second non-shared core portion not overlapping the first core portion. 
    
    
     
       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 transmission perspective view schematically illustrating a coil portion according to an embodiment of the present disclosure. 
         FIG.  2    is an exploded perspective view illustrating a coil portion included in the coil component of  FIG.  1   . 
         FIG.  3    is a cross-sectional view illustrating a core portion included in the coil component of  FIG.  1   . 
         FIG.  4    is a transmission perspective view schematically illustrating a coil portion according to an embodiment of the present disclosure. 
         FIG.  5    is an exploded perspective view illustrating a coil portion included in the coil component of  FIG.  4   . 
         FIG.  6    is a transmission perspective view schematically illustrating a coil portion according to a modified embodiment of an embodiment of the present disclosure. 
         FIG.  7    is a transmission perspective view schematically illustrating a coil portion according to a modified embodiment of an embodiment of the present disclosure. 
         FIG.  8    is a transmission perspective view schematically illustrating a coil portion according to another embodiment of the present disclosure. 
         FIG.  9    is an exploded perspective view illustrating a coil portion included in the coil component of  FIG.  8   . 
     
    
    
     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 X direction is a first direction or a length direction, a Y direction is a second direction or a width direction, a Z 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. 
     Thin Film Type Coil Component 
     First Embodiment 
       FIG.  1    is a transmission perspective view schematically illustrating a coil portion according to an embodiment of the present disclosure. 
       FIG.  2    is an exploded perspective view illustrating a coil portion included in the coil component of  FIG.  1   . 
       FIG.  3    is a cross-sectional view illustrating a core portion included in the coil component of  FIG.  1   . 
       FIG.  4    is a transmission perspective view schematically illustrating a coil portion according to an embodiment of the present disclosure. 
       FIG.  5    is an exploded perspective view illustrating a coil portion included in the coil component of  FIG.  4   . 
       FIG.  6    is a transmission perspective view schematically illustrating a coil portion according to a modified embodiment of an embodiment of the present disclosure. 
       FIG.  7    is a transmission perspective view schematically illustrating a coil portion according to a modified embodiment of an embodiment of the present disclosure. 
       FIG.  8    is a transmission perspective view schematically illustrating a coil portion according to another embodiment of the present disclosure. 
       FIG.  9    is an exploded perspective view illustrating a coil portion included in the coil component of  FIG.  8   . 
     Referring to  FIGS.  1  to  8   , a coil component  10  according to an embodiment of the present disclosure may include a body  50 , an insulation layer, coil portions  11  and  12 , and external electrodes  41 ,  42 ,  43 , and  44 , and may further include non-shared core portions A and B, a shared core portion C, and a substrate  25 . 
     The body  50  may form appearance of the coil component  10  according to the present embodiment, and the insulation layer may be disposed therein. 
     The body  50  may be formed in a hexahedral shape as a whole. 
     Referring to  FIG.  1   , the body  50  may include a first surface  101  and a second surface  102  facing each other in a longitudinal direction X, a third surface  103  and a fourth surface  104  facing each other in a thickness direction Z, and a fifth surface  105  and a sixth surface  106  facing each other in a width direction Y. Each of the third surface  103  and the fourth surface  104  of the body  50  facing each other may connect the first surface  101  and the second surface  102  of the body  50  facing each other. 
     The body  50  may include a magnetic material and an insulating resin. Specifically, the body  50  may be formed by stacking one or more magnetic sheets including an insulating resin and a magnetic material dispersed in the insulating resin. In some embodiments, the body  50  may have a structure other than a structure in which the magnetic material is dispersed in the insulating resin. For example, the body  50  may be made of a magnetic material such as ferrite. 
     The magnetic material may be a ferrite powder or a metal magnetic powder. 
     Examples of the ferrite powder may include at least 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, Ni—Zn-based ferrite, and the like, hexagonal ferrites such as Ba—Zn-based ferrite, Ba—Mg-based ferrite, Ba—Ni-based ferrite, Ba—Co-based ferrite, Ba—Ni—Co-based ferrite, and the like, garnet type ferrites such as Y-based ferrite, and the like, and Li-based ferrites. 
     The metal magnetic powder may include at least one of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni), and alloys thereof. For example, the metal magnetic powder 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 metal magnetic powder may be amorphous or crystalline. For example, the metal magnetic powder may be a Fe—Si—B—Cr-based amorphous alloy powder, but is not limited thereto. 
     The ferrite powder and the metal magnetic powder may have an average diameter from about 0.1 μm to about 30 μm, respectively, but are not limited thereto. As used herein, when the phrase “about” precedes a dimension or quantity, the dimension or quantity following the phrase “about” includes dimensions or quantities greater or smaller than the corresponding dimension or quantity within process variation or measuring variation. Thus, in context of the particular dimension or quantity being referred, the phrase “about” may include values that are, e.g., ±5% or ±10% of the particular dimension or quantity. 
     The body  50  may include two or more types of magnetic materials dispersed in the insulating resin. In this case, the term “different types of magnetic materials” means that magnetic materials dispersed in an insulating resin are distinguished from each other by an average size, a composition, a crystallinity, and a shape. 
     The insulating resin may include an epoxy, a polyimide, a liquid crystal polymer, or the like, in a single form or in combined form, but is not limited thereto. 
     The insulation layers may be disposed inside of the body  50  to be staggered parallel to each other. For example, a first insulation layer  21  disposed inside of the body, and a second insulation layer  22  disposed on the first insulation layer  21  may be included. First coil portion  11  may be disposed on at least one surface of the first insulation layer  21 , and second coil portion  12  may be disposed on at least one surface of the second insulation layer  22 . Since the second coil portion  12  may be disposed on the first coil portion  11 , and the coil portions  11  and  12  may be arranged to be staggered parallel to each other, the first insulation layer  21  may be disposed to be staggered on the second insulation layer  22 . 
     The insulation layer may be formed of an insulating material including a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as a 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 insulation layer may be formed of an insulating material such as prepreg, Ajinomoto Build-up Film (ABF), FR-4, a bismaleimide triazine (BT) film, a photoimageable dielectric (PID) film, 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 insulation layer is formed of an insulating material including a reinforcing material, better rigidity may be provided to the insulation layer. When the insulation layer is formed of an insulating material not containing glass fibers, the insulation layer may be advantageous for thinning a thickness of the entire coil portions  11  and  12 . When the insulation layer is formed of an insulating material including a photosensitive insulating resin, the number of processes for forming the coil portions  11  and  12  may be reduced, which may be advantageous in reducing the production cost and may form fine vias. 
     The coil portions  11  and  12  may be respectively disposed on both surfaces of the insulation layer facing each other, and may exhibit the characteristics of the coil component. For example, when a coil component  10  of an embodiment of the present disclosure is used as a power inductor, the coil portions  11  and  12  may function to stabilize power of an electronic device by storing an electric field as a magnetic field and maintaining an output voltage. 
     The first coil portion  11  may be disposed inside of the body  50 , and the second coil portion  12  may be disposed on the first coil portion  11  in the body  50 . In an embodiment of the present disclosure, the first and second coil portions  11  and  12  may be coiled in the same direction, and the first and second coil portions  11  and  12  may be coiled in opposite directions. For example, turn directions of the coil portions  11  and  12  may be the same or different. The coil portions  11  and  12  may have a structure in which a plurality of coil patterns are stacked. For example, the first coil portion  11  may include first and second coil patterns  11   a  and  11   b , the second coil portion  12  may include third and fourth coil patterns  12   a  and  12   b . The first and second coil patterns  11   a  and  11   b , and the third and fourth coil patterns  12   a  and  12   b  may be connected to each other by vias  11   v  and  12   v , respectively. 
     The coil portions  11  and  12  and the via may be formed by including a metal having excellent electrical conductivity, and may be formed of silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni), titanium (Ti), gold (Au), copper (Cu), platinum (Pt), alloys thereof, or the like. 
     The external electrodes  41 ,  42 ,  43 , and  44  may be disposed outside of the body  50 , and may be connected to both ends of the coil portions  11  and  12 , respectively. Specifically, the first and second external electrodes  41  and  42  may be disposed outside of the body  50 , and may be connected to both ends of the first coil portion  11 , respectively. The third and fourth external electrodes  43  and  44  may be disposed outside of the body  50 , and may be connected to both ends of the second coil portion  12 , respectively. Specifically, the first and second external electrodes  41  and  42  may be connected to the lead-out portions  51 ,  52 ,  53 , and  54  of the first coil portion  11 , respectively, and the third and fourth external electrodes  43  and  44  may be connected to the lead-out portions  51 ,  52 ,  53 , and  54  of the second coil portion  12 , respectively. 
     As illustrated in  FIG.  1   , the first and second external electrodes  41  and  42  may be disposed in positions opposite to each other with the first coil portion  11  interposed therebetween, and similarly, the third and fourth external electrodes  43  and  44  may be disposed in positions opposite to each other with the second coil portion  12  interposed therebetween. Therefore, the first external electrode  41  and the third external electrode  43  may be arranged adjacent to each other, and the second external electrode  42  and the fourth external electrode  44  may be arranged adjacent to each other. 
     The first and third external electrodes  41  and  43  may be input terminals, and the second and fourth external electrodes  42  and  44  may be output terminals, but are not limited thereto. Therefore, electric current input from the first external electrode  41 , which may be the input terminal, may flow to the second external electrode  42 , which may be the output terminal, through the first coil portion  11 . Likewise, electric current input from the third external electrode  43 , which may be the input terminal, may flow to the fourth external electrode  44 , which may be the output terminal, through the second coil portion  12 . 
     The external electrodes  41 ,  42 ,  43 , and  44  may be formed using a paste containing a metal having excellent electrical conductivity. For example, the external electrodes  41 ,  42 ,  43 , and  44  may be a conductive paste containing nickel (Ni), copper (Cu), tin (Sn), silver (Ag), or the like, in a single form, or an alloy thereof, or the like. Further, a plated layer may further be formed on each of the external electrodes  41 ,  42 ,  43 , and  44 . In this case, the plated layer may include one or more selected from the group consisting of nickel (Ni), copper (Cu), and tin (Sn). For example, a nickel (Ni) layer and a tin (Sn) may be sequentially formed. 
     The core portions A, B, and C may each correspond to one region disposed in the first coil portion  11  and the second coil portion  12  in the body  50 . In a coil component according to the embodiment of the present disclosure, since the coil portions  11  and  12  located in upper and lower portions of the body  50  on the basis of a central portion of the body  50  may be formed adjacent to each other while sharing the core portion, the coupling coefficient may be controlled by appropriately increasing or decreasing relative areal ratio of the shared core portion and non-shared core portions. 
     Therefore, leakage inductance and mutual inductance may be controlled and realized to desired values. When the coupling coefficient is a value close to 1, the coupling coefficient may be relatively large, and the (−) sign means a negative coupling. 
     Specifically, the first coil portion  11  may have first core portions A and C, and the second coil portion  12 , disposed on the first coil portion  11 , may have second core portions B and C. Referring to  FIGS.  1  to  4   , the first core portions A and C may include a first shared core portion C overlapping the second core portion C, and a first non-shared core portion A not overlapping the second core portions B and C, when viewed from an upper portion of the first coil portion  11 ; and the second core portions B and C may include a second shared core portion C overlapping the first core portion C, and a second non-shared core portion B not overlapping the first core portions A and C, when viewed from an upper portion of the second coil portion  12 . 
     In an embodiment of the present disclosure, a case in which an area of the first and second shared core portions C is larger than an area of each of the first and second non-shared core portions A and B, respectively, may be included. As the area of the core portion shared between the two coil portions  11  and  12  increases, the mutual inductance may increase and the coupling coefficient (k) may increase. Also, a case in which an area of the first and second shared core portions C is smaller than an area of each of the first and second non-shared core portions A and B, respectively, may be included. As the area of the non-shared core increases, the leakage inductance may increase, thereby decreasing the coupling coefficient (k). 
     In the conventional coupled inductor, the coupling coefficient may be controlled by using a thickness between the coil portions  11  and  12 , arranged in a vertical direction. There may be a limit in reducing the thickness of the coil component. When a gap between the coil portions  11  and  12  increases, there may be a problem in that a size of the component increases. In the present embodiment, the coupling coefficient (k) may be controlled without increasing the mounting area in the X-Y plane having a relatively large spatial margin, by controlling the relative area ratio of the core portions C shared by the coil portions  11  and  12 , and the core portions A and B not shared by the coil portions  11  and  12 . 
     Manufacturing Method of Coil Component 
     The insulation layer may be applied in all cases as long as thin film type members have an insulating property. For example, the insulation layer may be a prepreg (ppg), or a conventional copper clad laminate from which upper and lower copper foil layers are removed. The specific thickness thereof is not limited, and it may be sufficient when a support function is suitably performed. For example, in order to utilize the existing facilities as they are, it is preferable that the thickness be about 60 μm. 
     Next, a copper foil layer may be formed on an insulation layer, and may be usually made of copper (Cu), although it is not limited as long as it is a material having electrical conductivity. There is no limitation on a method of forming the copper foil layer, and it may be a chemical plating method or a sputtering method, and may be appropriately selected by a person skilled in the art, depending on the process conditions and the required specifications. 
     An insulation resist may be disposed on the copper foil layer, and the resist may be derived by exposing/developing a dry film having a predetermined thickness to have a coil-shaped pattern. The insulation resist may be removed to form coil patterns  11   a ,  11   b ,  12   a , and  12   b , and vias, having a spiral shape as a whole. 
     Next, an insulation layer may be separately separated to form a plurality of bodies  50 . As a result, at least two bodies  50  may be formed on upper and lower portions of the insulation layer. Therefore, it may be advantageous to improve symmetry and yield between the bodies  50 . 
     Then, through-holes penetrating a central portion of the body  50  may be processed, and the inside of the through-hole and the inside of the body  50  may be filled with a magnetic material, to seal the entire coil portions  11  and  12 . 
     Second Embodiment 
     Referring to  FIGS.  6  and  7   , a coil component  100  according to the present embodiment may further include a substrate  25  between two coil portions  11  and  12 , compared with the coil component  10  according to the first embodiment of the present disclosure. Therefore, in describing the present embodiment, only the substrate  25  different from the first embodiment will be described. The remaining configuration of the present embodiment may be applied, as it is in the first embodiment of the present disclosure. 
     The substrate  25  may be disposed between the first coil portion  11  and the second coil portion  12  to support the coil portions  11  and  12 . In an embodiment of the present disclosure, the substrate  25  may include a third region overlapping first and second shared core portions, a first region overlapping a first non-shared core portion, and a second region overlapping a second non-shared core portion. The substrate  25  may have three separate regions A1, B1, and C1, corresponding to each of the core portions A, B, and C of the first and second coil portions  11  and  12 . The substrate  25  may further include end portions  61 ,  62 ,  63 , and  64  extending to a fifth surface and a sixth surface of a body  50 . Each of the end portions  61 ,  62 ,  63 , and  64  may be arranged to be spaced apart from each other on a plane parallel to a third surface  103  of the body  50 . The end portions  61 ,  62 ,  63 , and  64  may be shapes corresponding to lead-out portions  51 ,  52 ,  53 , and  54  of the coil portions  11  and  12 , and may be arranged to be spaced apart from each other in a direction parallel to the lead-out portions  51 ,  52 ,  53 , and  54 , and a fifth surface  105  of the body  50 . The first and second end portions  61  and  62  may be shapes corresponding to the first and second lead-out portions  51  and  52  of the first coil portion  11 , respectively, and may be arranged to be spaced apart from the first and second lead-out portions  51  and  52 . The third and fourth end portions  63  and  64  may be shapes corresponding to the third and fourth lead-out portions  53  and  54  of the second coil portion  12 , and may be arranged to be spaced apart from the third and fourth lead-out portions  53  and  54 . 
     The substrate  25  may be formed of an insulating material including a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as a 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 substrate  25  may be formed of an insulating material such as prepreg, Ajinomoto Build-up Film (ABF), FR-4, a bismaleimide triazine (BT) film, a photoimageable dielectric (PID) film, and the like, but is not limited thereto. 
     The substrate  25  may also be formed of a copper clad laminate. In this case, a sheet in which insulating material such as paper or glass fiber may be impregnated with insulating resin may be stacked several times, and then copper foil (Cu) may be bonded. In an embodiment of the present disclosure, by using the copper clad laminate as the substrate  25 , the coupling with the first and second coil portions  11  and  12  may be facilitated, to enhance function of supporting the coil. 
     The following Table 1 illustrates an experimental example in which values of coupling coefficient (k) according to an area of a shared core portion(s) may be compared in an embodiment of the present disclosure. In Comparative Example 1 and Comparative Example 2, values of the coupling coefficient (k) were measured by varying an area of a shared core portion(s). 
     
       
         
           
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 Comparative 
                 Area of Shared 
                 Coupling 
               
               
                 Example 
                 Core Portion (mm 2 ) 
                 Coefficient (k) 
               
               
                   
               
             
            
               
                 1 
                 0.7323 
                 −0.26668 
               
               
                 2 
                 1.3803 
                 −0.46719 
               
               
                   
               
            
           
         
       
     
     As can be seen from the experimental results in Table 1, the absolute value of the coupling coefficient increased, as the area of the shared core portion C of the coupled inductor increases. As the area of the core portion C shared between the two coil portions  11  and  12  increases, the mutual inductance increases, thereby increasing the coupling coefficient (k). As the area of the shared core portion C decreases, the leakage inductance increases, thereby decreasing the coupling coefficient (k). According to an embodiment of the present disclosure, the inductor current ripple may be effectively controlled, without increasing the mounting area, by controlling the relative area ratio of the shared core portion C and the non-shared core portions A and B. 
     Manufacturing Method of Coil Component 
     Referring to  FIGS.  6  and  7   , the substrate  25  may be further disposed between the first and second coil portions  11  and  12 . Due to the presence of the substrate  25 , the thin film type coil component  100  of the present disclosure has three separate regions overlapping the three core portions, as compared to the conventional thin film type coil component. 
     Referring to  FIG.  6   , the coil portions  11  and  12  may be supported by the substrate  25 . The first coil portion  11  may be formed on one surface of the substrate  25 , and the second coil portion  12  may be formed on the other surface of the substrate  25 , facing the one surface of the substrate  25 . The first and second coil portions  11  and  12  may be formed to be arranged alternately to each other on both surfaces of the substrate  25 , because the second coil portion  12  may be disposed on the first coil portion  11  in parallel with each other. The first insulation layer  21  may be formed on a first coil pattern  11   a  of the first coil portion  11 , and the second insulation layer  22  may be formed on a third coil pattern  12   a  of the second coil portion  12 , to surround the first and second coil portions  11  and  12  by the insulation layers, respectively. After the formation of the insulation layer, a second coil pattern  11   b  may be formed on the first coil pattern  11   a , and a fourth coil pattern  12   b  may be formed on the third coil pattern  12   a.    
     Thereafter, a first via may be formed in the first insulation layer  21  to electrically connect the first coil pattern  11   a  of the first coil portion  11  to the second coil pattern  11   b . A second via may be formed in the second insulation layer  22  to electrically connect the third coil pattern  12   a  of the second coil portion  12  to the fourth coil pattern  12   b . Therefore, a coil pattern surrounded by an insulation layer and electrically connected may be formed on both surfaces of the substrate  25 . 
     The substrate  25  on which the coil portions  11  and  12  are formed on both surfaces may be trimmed into three separate regions A1, B1, and C1, and, for example, may be separated as a third region C1 overlapping the core portion in which the first and second coil portions  11  and  12  overlap each other, a first region A1 overlapping the first non-shared core portion A, and a second region B1 overlapping the second non-shared core portion B, respectively. 
     As illustrated in  FIG.  6   , since the second coil portion  12  is disposed on the first coil portion  11  to be staggered parallel to each other, a region in which a coil pattern is not formed on each of the first and second insulation layers  21  and  22  may occur. An operation of removing an insulation layer in which the coil pattern is not disposed in the trimming operation may be also performed. 
     After the trimming operation, a magnetic sheet including the metal magnetic powder may be filled to form the body  50 . 
     Third Embodiment (Stacked Coil Component) 
     Referring to  FIGS.  8  and  9   , a coil component  1000  according to the present embodiment may be manufactured in a thin film type according to the first embodiment of the present disclosure, but may also be manufactured in a stack type. Therefore, in describing the present embodiment, only the stack coil component different from the first embodiment will be described. The remaining configuration of the present embodiment may be applied, as it is in the first embodiment of the present disclosure. 
     Another embodiment of the present disclosure may provide a coil component comprising a ceramic body  50  in which an insulation sheet is stacked. 
     The ceramic body  50  may be formed by stacking a plurality of insulation sheets. The plurality of insulation sheets for forming the ceramic body  50  may be sintered, and may be integrated in a degree to be difficult to confirm without using a scanning electron microscope (SEM). The ceramic body  50  may have a hexahedronal shape, and the ceramic body  50  may include a known ferrite such as an Al 2 O 3 -based dielectric, or Mn—Zn-based ferrite, Ni—Zn-based ferrite, Ni—Zn—Cu-based ferrite, Mn—Mg-based ferrite, Ba-based ferrite, Li-based ferrite, and the like. 
     The coil portions  11  and  12  may be formed by electrically connecting internal coil patterns  11   a ,  11   b ,  11   c ,  12   a ,  12   b  and  12   c , formed by printing a conductive paste containing a conductive metal in a predetermined thickness, to a plurality of insulation sheets forming the ceramic body  50 . Vias ( 11   v  and  12   v ) may be formed at predetermined positions in the respective insulation sheets on which the coil patterns  11   a ,  11   b ,  11   c ,  12   a ,  12   b  and  12   c  are printed, and the internal coil patterns  11   a ,  11   b ,  11   c ,  12   a , and  12   c  may be electrically connected to each other, to form a single coil. 
     The stacked body  50  may include a magnetic body. For example, the body  50  may include Mn—Zn-based ferrite, Ni—Zn-based ferrite, Ni—Zn—Cu-based ferrite, Mn—Mg-based ferrite, Ba-based ferrite, Li-based ferrite, and the like, and may include a variety of known magnetic bodies. 
     The conductive metal forming the coil patterns  11   a ,  11   b ,  11   c ,  12   a ,  12   c  and  12   c  is not particularly limited as long as it is a metal having excellent electric conductivity, and, for example, may be silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni), titanium (Ti), gold (Au), copper (Cu), platinum (Pt), or the like, in a single form, or alloys thereof. Copper (Cu) may be used most preferably, when both the improvement of the electrical conductivity and the reduction of the manufacturing cost are taken into consideration. 
     Two internal coil patterns  11   a ,  11   b ,  12   a , and  12   b , among the plurality of coil patterns  11   a ,  11   b ,  11   c ,  12   a ,  12   b  and  12   c  forming the coil portions  11  and  12 , may include the lead-out portions  51 ,  52 ,  53 , and  54  leading out to the outside of the stacked body  50  to be connected to the stack body  50 , to be connected to the outer electrodes  41 ,  42 ,  43 , and  44 . 
     The present disclosure is not limited by the above-described embodiments and the accompanying drawings, but is intended to be limited only by the appended claims. 
     The coil component according to an embodiment of the present disclosure may adjust the coupling coefficient and the leakage inductance by controlling the area and permeability of the core portion shared by the two coil portions disposed inside of the body. 
     In addition, through the above, the leakage inductance and the mutual inductance may be controlled to desired values. 
     While example embodiments have been illustrated 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.