Patent Publication Number: US-2020294712-A1

Title: Coil electronic component

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit of priority to Korean Patent Application No. 10-2019-0028763 filed on Mar. 13, 2019 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a coil electronic component. 
     BACKGROUND 
     An inductor, one type of coil component, is a passive electronic component used in electronic devices along with a resistor and a capacitor. 
     Among coil components, a thin film coil component may be manufactured by manufacturing a coil substrate by forming a coil on an insulating substrate through a plating method, manufacturing a body by layering magnetic composite sheets including a magnetic power and resin mixed therein on the coil substrate, and forming external electrodes on an external portion of the body. 
     As electronic devices have been designed to have high performance and reduced sizes, an increased number of coil components have been used in electronic devices and sizes of coil components have been reduced. Accordingly, thicknesses of a thin film coil component and a coil substrate have been reduced. 
     However, as a coil component has been designed to have a reduced size, stress may be concentrated on a portion in which a lead-out portion is connected to a coil portion in a coil component, which may degrade connection reliability between the lead-out portion and the coil portion. 
     SUMMARY 
     An aspect of the present disclosure is to provide a coil component which may improve connection reliability between a lead-out portion and a coil portion. 
     Another aspect of the present disclosure is to provide a coil component which may prevent separation between a conductor and a body in the component. 
     According to an aspect of the present disclosure, a coil electronic component may include a body having a first surface and a second surface opposing each other, and a third surface and a fourth surface connecting the first surface to the second surface and opposing each other; an insulating substrate disposed in the body; first and second coil portions respectively disposed on a first surface and a second surface of the insulating substrate opposing each other; a first lead-out portion disposed on the first surface of the insulating substrate and exposed to the first surface and the third surface of the body; a second lead-out portion disposed on the first surface of the insulating substrate and exposed to the second surface and the third surface of the body; a first connection conductor disposed on the first surface of the insulating substrate and connecting the first lead-out portion and the first coil portion; and a second connection conductor disposed on the second surface of the insulating substrate and connecting the second lead-out portion and the second coil portion, wherein the first connection conductor and the second connection conductor respectively include a plurality of first connection conductors and a plurality of second connection conductors, and the plurality of first connection conductors are spaced apart from one another and the plurality of second connection conductors are spaced apart from one another. 
     According to another aspect of the present disclosure, a coil electronic component may include a body; an insulating substrate disposed in the body; first and second coil portions respectively disposed on a first surface and a second surface of the insulating substrate opposing each other; a first lead-out portion disposed on the first surface of the insulating substrate and exposed to at least two external surfaces of the body; a second lead-out portion disposed on the first surface of the insulating substrate and exposed to at least two external surfaces of the body; a first connection conductor disposed on the first surface of the insulating substrate and connecting the first lead-out portion and the first coil portion; and a second connection conductor disposed on the second surface of the insulating substrate and connecting the second lead-out portion and the second coil portion, wherein the first connection conductor and the second connection conductor respectively include a plurality of first connection conductors and a plurality of second connection conductors, the plurality of first connection conductors are spaced apart from one another and the plurality of second connection conductors are spaced apart from one another, each of the plurality of first connection conductors extends in a diagonal direction with reference to the first to fourth surface of the body between the first coil portion and the first lead-out portion, and each of the plurality of second connection conductors extends in the diagonal direction between the second coil portion and the second lead-out 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 perspective diagram illustrating a coil electronic component according to an example embodiment of the present disclosure; 
         FIG. 2  is a diagram illustrating coil portions of a coil electronic component illustrated in  FIG. 1  according to an example embodiment of the present disclosure; 
         FIG. 3  is a diagram illustrating portion A illustrated in  FIG. 2 ; 
         FIG. 4  is a diagram illustrating portion A illustrated in  FIG. 3  viewed in an I direction; 
         FIG. 5  is graphs illustrating a difference in plating thickness of a line width between a coil portion and a lead-out portion; 
         FIGS. 6A-6C  are diagrams illustrating coil portions according to a modified example; 
         FIG. 7  is a diagram illustrating coil portions of a coil electronic component according to another example embodiment; 
       and 
         FIG. 8  is a diagram illustrating coil portions of a coil electronic component of a modified example of another example embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be described as follows with reference to the attached drawings. 
     The terms used in the following description are provided to explain a specific exemplary embodiment and are not intended to be limiting. A singular term includes a plural form unless otherwise indicated. The terms, “include,” “comprise,” “is configured to,” etc. of the description 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 features, numbers, steps, operations, elements, parts or combination thereof. Also, the terms “disposed on,” “positioned on,” “mounted on,” and the like, may indicate that an element may be disposed on or below another element, and do not necessarily indicate that an element is only disposed in an upper portion with reference to a gravitational direction. 
     It will be understood that when an element is “coupled with/to” or “connected with” another element, the element may be directly coupled with/to another element, and there may be an intervening element between the element and another element. 
     Sizes and thicknesses of elements illustrated in the drawings are merely examples to help understanding of technical matters of the present disclosure. 
     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. 
     In the drawings, same elements will be indicated by same reference numerals. Also, redundant descriptions and detailed descriptions of known functions and elements that may unnecessarily make the gist of the present invention obscure will not be provided. 
     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, and other purposes. 
     In an electronic device, a coil component may be used as a power inductor, an HF inductor, a general bead, a GHz bead, a common mode filter, and the like. 
     In the description below, an example embodiment in which a coil electronic component  10  is implemented as a thin film inductor used in a power line of a power supply circuit will be described. The coil component in example embodiments may also be implemented as a chip bead, a chip filter, and the like, other than a thin film inductor. 
     First Example Embodiment 
       FIG. 1  is a perspective diagram illustrating a coil electronic component according to an example embodiment.  FIG. 2  is a diagram illustrating coil portions of a coil electronic component illustrated in  FIG. 1  according to an example embodiment.  FIG. 3  is a diagram illustrating portion A illustrated in  FIG. 2 .  FIG. 4  is a diagram illustrating portion A illustrated in  FIG. 3  viewed in an I direction.  FIG. 5  is graphs illustrating a difference in plating thickness of a line width between a coil portion and a lead-out portion.  FIGS. 6A-6C  are diagrams illustrating coil portions according to a modified example. 
     Referring to  FIGS. 1 to 6A-6C , a coil electronic component  10  may include a body  50 , an insulating substrate  23 , coil portions  42  and  44 , lead-out portions  62  and  64 , and connection conductors  31  and  32 , and may further include external electrodes  851  and  852  and dummy lead-out portions  63  and  65 . 
     The body  50  may form an exterior of the coil electronic component  10 , and may include the insulating substrate  23  disposed therein. 
     The body  50  may have a hexahedral shape. 
     The body  50  may include a first surface  101  and a second surface  102  opposing each other in a length direction (X), a third surface  103  and a fourth surface  104  opposing each other in a thickness direction (Z), and a fifth surface  105  and a sixth surface  106  opposing each other in a width direction (Y). The third surface  103  and the fourth surface  104  of the body  50  opposing each other may connect the first surface  101  and the second surface  102  of the body  50  opposing each other. 
     The body  50  may be configured such that the coil electronic component  10  including the external electrodes  851  and  852  disposed therein may have a length of 0.2±0.1 mm, a width of 0.25±0.1 mm, and a thickness of 0.4 mm, but an example embodiment thereof is not limited thereto. 
     The body  50  may include a magnetic material and an insulating resin. For example, the body  50  may be formed by layering one or more magnetic material sheets including an insulating resin and a magnetic material dispersed in the insulating resin. The body  50  may also have a structure different from the structure in which a magnetic material is disposed in an insulating resin. For example, the body  50  may be formed of a magnetic material such as ferrite. 
     The magnetic material may be ferrite power or magnetic metal power. 
     The ferrite power may be one or more of spinel ferrite 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 ferrite 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 ferrite such as Y based ferrite, and Li based ferrite, for example. 
     The magnetic metal power 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) or alloys thereof. For example, the magnetic metal power may be at least one or more of pure iron powder, Fe—Si based alloy power, Fe—Si—Al based alloy power, Fe—Ni based alloy power, Fe—Ni—Mo based alloy power, Fe—Ni—Mo—Cu based alloy power, Fe—Co based alloy power, Fe—Ni—Co based alloy power, Fe—Cr based alloy power, Fe—Cr—Si based alloy power, Fe—Si—Cu—Nb based alloy power, Fe—Ni—Cr based alloy power, and Fe—Cr—Al based alloy power. 
     The magnetic metal power may be amorphous or crystalline. For example, the magnetic metal power may be Fe—Si—B—Cr based amorphous alloy power, but an example embodiment thereof is not limited thereto. 
     An average diameter of each of the ferrite power and the magnetic metal power may be 0.1 μm to 30 μm, but an example embodiment thereof is not limited thereto. 
     The body  50  may include two or more different types of magnetic materials disposed in an insulating resin. The notion that different types of magnetic materials may be included indicates that the magnetic materials may be distinguished from each other by one of an average diameter, a composition, crystallinity, and a shape. 
     The insulating resin may include one of epoxy, polyimide, a liquid crystal polymer, and the like, or combinations thereof, but an example embodiment thereof is not limited thereto. 
     The insulating substrate  23  may be disposed in the body  50 , and the coil portions  42  and  44  may be disposed in both surfaces of the insulating substrate  23 , respectively. The insulating substrate  23  may include a support portion  24  supporting the coil portions  42  and  44 , and end portions  231  and  232  supporting the lead-out portions  62  and  64 . 
     The insulating substrate  23  may be formed of a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as a polyimide resin, or an insulating material including a photosensitive insulating resin, or may be formed of an insulating material in which a reinforcement such as glass fiber or an inorganic filler is impregnated in the above-mentioned insulating materials. For example, the insulating substrate  23  may be formed of an insulating material such as prepreg, ajinomoto build-up film (ABF), FR-4, bismaleimide triazine (BT), a photoimageable dielectric (PID), or the like, but an example of the material may not be limited thereto. 
     As the inorganic filler, at least one or more elements selected from among a group consisting of silica (SiO 2 ), aluminum oxide (Al 2 O 3 ), silicon carbide (SiC), barium sulfate (BaSO 4 ), talc, mud, mica power, 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 (BaTiO3), and calcium zirconate (CaZrO 3 ) may be used. 
     When the insulating substrate  23  is formed of an insulating material including reinforcement, the insulating substrate  23  may provide improved stiffness. When the insulating substrate  23  is formed of an insulating material which does not include glass fiber, overall thicknesses of the coil portions  42  and  44  may be easily reduced. 
     The support portion  24  may be disposed between the coil portions  42  and  44  of the insulating substrate  23  and may support the coil portions  42  and  44 . The first end portion  231  may extend from the support portion  24 , may be disposed between the first lead-out portion  62  and the first dummy lead-out portion  63 , and may support the first lead-out portion  62  and the first dummy lead-out portion  63 . The second end portion  232  may extend from the support portion  24 , may be disposed between the second lead-out portion  64  and a second dummy lead-out portion  65 , and may support the second lead-out portion  64  and the second dummy lead-out portion  65 . 
     The coil portions  42  and  44  may be disposed on both surfaces of the insulating substrate  23  opposing each other, and may implement properties of the coil electronic component. For example, when the coil electronic component  10  is used as a power inductor, the coil portions  42  and  44  may maintain an output voltage by storing electric fields as magnetic fields, thereby stabilizing power of an electronic device. 
     The coil portions  42  and  44  in an example embodiment may be disposed perpendicularly to the third surface  103  or the fourth surface  104  of the body  50 . 
     The notion that the coil portions  42  and  44  may be disposed perpendicularly to the third surface  103  or the fourth surface  104  may indicate that the surfaces of the coil portions  42  and  44  adjacent to the insulating substrate  23  may be disposed perpendicularly or almost perpendicularly to the third surface  103  or the fourth surface  104  of the body  50 . For example, the coil portions  42  and  44  may be disposed perpendicularly to the third surface  103  or the fourth surface  104  of the body  50  within an angle of 80 to 100°. 
     The coil portions  42  and  44  may be disposed in parallel to the fifth surface  105  and the sixth surface  106  of the body  50 . Thus, surfaces of the coil portions  42  and  44  in contact with the insulating substrate  23  may be in parallel to the fifth surface  105  and the sixth surface  106  of the body  50 . 
     The coil portions  42  and  44  may include at least one or more conductive layers. 
     The coil portions  42  and  44  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, but an example embodiment thereof is not limited thereto. 
     As a size of the body  50  decreases to a 1608 size or 1006 or less, a thickness of the body  50  may be greater than a width, and an area of a cross-sectional surface of the body  50  taken in an X-Z direction may be greater than an area of a cross-sectional surface taken in an X-Y direction. Accordingly, as the coil portions  42  and  44  are disposed perpendicularly to the third surface  103  or the fourth surface  104  of the body  50 , an area in which the coil portions  42  and  44  are disposed may increase. 
     For example, when a length of the body  50  is 1.6±0.2 mm, and a width is 0.8±0.05 mm, a thickness may satisfy a range of 1.0±0.05 mm (1608 size), and when a length of the body  50  is 0.2±0.1 mm, and a width is 0.25±0.1 mm, a thickness may satisfy a range of a maximum 0.4=(1006 size). As the thickness is greater than the width, the coil portions  42  and  44  may secure a greater area when the coil portions  42  and  44  are disposed perpendicularly to the third surface  103  or the fourth surface  104  of the body  50  as compared to an example in which the coil portions  42  and  44  are disposed horizontally to the third surface  103  or the fourth surface  104  of the body  50 . The greater the area of the coil portions  42  and  44 , the more inductance (L) and quality factor (Q) may increase. 
     The first coil portion  42  disposed on one surface of the insulating substrate  23  may oppose the second coil portion  44  disposed on the other surface of the insulating substrate  23 , and may be electrically connected to each other through a via electrode  46  disposed on the insulating substrate  23 . 
     Each of the first coil portion  42  and the second coil portion  44  may have a planar spiral form forming at least one turn with reference to a core portion  71  as a shaft. As an example, the first coil portion  42  may form at least one turn on one surface of the insulating substrate  23  with reference to the core portion  71  as a shaft. 
     The coil portions  42  and  44  and the via electrode  46  may include a metal having high conductivity. For example, the coil portions  42  and  44  and the via electrode  46  may be formed of silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni), titanium (Ti), gold (Au), copper (Cu), platinum (Pt), or alloys thereof, or other elements. 
     The lead-out portions  62  and  64  may be exposed to the first surface  101  and the second surface  102  of the body  50 . For example, the first lead-out portion  62  and the first dummy lead-out portion  63  may be exposed to the first surface  101  of the body  50 , and the second lead-out portion  64  and the second dummy lead-out portion  65  may be exposed to the second surface  102  of the body  50 . 
     Referring to  FIG. 1 , one end of the first coil portion  42  formed on one surface of the insulating substrate  23  may extend and may form the first lead-out portion  62 , and the first lead-out portion  62  may be exposed to the first surface  101  and the third surface  103  of the body  50 . Also, one end of the second coil portion  44  may extend to the other surface of the insulating substrate  23 , opposing the one surface, and may form the second lead-out portion  64 , and the second lead-out portion  64  may be exposed to the second surface  102  and the third surface  103  of the body  50 . 
     Referring to  FIGS. 1 to 4 , the external electrodes  851  and  852  may be connected to the coil portions  42  and  44  through the lead-out portions  62  and  64  disposed in the body  50 . 
     The lead-out portions  62  and  64  may be disposed in the body and may have an “L” shaped form. An area in which the lead-out portions  62  and  64  are disposed may be narrower than a width of the body  50 . The lead-out portions  62  and  64  may extend from the first surface  101  and the second surface  102  of the body  50 , respectively, and may be led out to the third surface  103 , and may not be disposed on the fourth surface  104 , the fifth surface  105 , and the sixth surface  106  of the body  50 . As the lead-out portions  62  and  64  are formed on the third surface  103  of the body  50 , the effect of the lead-out portions  62  and  64  interfering with a flow of magnetic flux may decrease such that an inductor performance such as inductance (L), quality factor (Q), and the like, may improve. 
     The lead-out portions  62  and  64  may include a conductive metal such as copper (Cu), and may be formed in integrated form while the coil portions are plated. As the lead-out portions  62  and  64  formed consecutively on the first to third surfaces of the body  50  are formed in the body  50 , a contact area between the lead-out portions and the external electrodes may increase as compared to a general lower electrode structure, and accordingly, a size of the coil electronic component may decrease, and high capacity may be implemented. 
     The connection conductors  31  and  32  may be disposed on both surfaces of the insulating substrate  23  and may connect the lead-out portions  62  and  64  and the coil portions  42  and  44 . For example, the first connection conductor  31  may be disposed on one surface of the insulating substrate  23  and may connect the first lead-out portion  62  and the first coil portion  42 , and the second connection conductor  32  may be disposed on the other surface opposing the one surface of the insulating substrate  23  and may connect the second lead-out portion  64  and the second coil portion  44 . 
     Referring to  FIGS. 2 and 6 , a plurality of the first connection conductors  31  and a plurality of the second connection conductors  32  may be provided, and the plurality of connection conductors  31  and  32  may be spaced apart from each other. Referring to  FIGS. 6B and 6C , the number of each of the connection conductors  31  and  32  may be four or five, but an example embodiment thereof is not limited thereto. Referring to  FIGS. 2, 6A, 6B, and 6C , as a plurality of the connection conductors  31  and  32  are provided and spaced apart from each other, connection reliability between the coil portions  42  and  44  and the lead-out portions  62  and  64  may improve as compared to a structure in which each of the connection conductors  31  and  32  has a single form. As an example, the first coil portion  42  is connected to the first lead-out portion  62  by the plurality of first connection conductors  31  spaced apart from each other, even when one of the plurality of first connection conductors  31  is broken, electrical and physical connections between the first coil portion  42  and the first lead-out portion  62  may be maintained through the remaining first connection conductors  31 . 
     As the plurality of the connection conductors  31  and  32  are disposed, the body  50  may be charged between the connection conductors  31  and  32 . As an example, as a plurality of the first connection conductors  31  are disposed and are spaced apart from each other, the body  50  may be charged in every space between the plurality of first connection conductors  31 . Accordingly, cohesion force between the first connection conductor  31  and the body  50  may increase (anchoring effect). 
     Referring to  FIG. 2 , when a line width of each of the connection conductors  31  and  32  is t, and a line width of each of the coil portions  42  and  44  is T, t and T may satisfy T≤t≤2T. When the line width t of the connection conductors  31  and  32  is less than the line width T of the coil portions  42  and  44 , connection reliability between the coil portions  42  and  44  and the lead-out portions  62  and  64  may degrade, and a surface area of the connection conductors  31  and  32  surrounded by a magnetic material may relatively decrease, and accordingly, cohesion force between the connection conductors  31  and  32  and the body  50  may decrease (decrease of anchoring effect). When the line width t of the connection conductors  31  and  32  exceeds twice the line width T of the coil portions  42  and  44 , a plating thickness may be greater than a plating thickness of the coil portions  42  and  44 , and an area occupied by the line width t of the connection conductors  31  and  32  may be greater than an area occupied by the external electrodes  851  and  852  in the overall coil component. Referring to  FIG. 5 , when the line width t of the connection conductors  31  and  32  exceeds twice the line width T of the coil portions  42  and  44 , the line width t of the connection conductors  31  and  32  may become similar to a plating thickness of the lead-out portions  62  and  64 , and accordingly, a deviation in plating thickness between the line width t of the connection conductors  31  and  32  and the line width T of the coil portions  42  and  44  may increase. As a deviation in plating thickness increases, the amount of a magnetic material may decrease in the same volume of a coil electronic component, and mechanical strength and an inductance value of a coil component may degrade. 
     Referring to  FIG. 4 , a cross-sectional surface of each of the connection conductors  31  and  32  may have a square shape, and the connection conductors  31  and  32  may be disposed on the insulating substrate  23  and may be supported by the insulating substrate  23 . As an example, a 2-1 connection conductor  32   a , a 2-2 connection conductor  32   b , and a 2-3 connection conductor  32   c , each of which has a square shaped cross-sectional surface, may be disposed on the end portion  232 . However, an example embodiment thereof may not be limited to the example illustrated in the diagram, and a portion of the insulating substrate  23  supporting the connection conductors  31  and  32  may be removed during a trimming process for processing the insulating substrate  23 . In this case, the amount of a magnetic material may further increase. 
     Although not illustrated in detail, a cross-sectional surface of each of the connection conductors  31  and  32  may include at least one portion having a curved shape. As elasticity rates (Young&#39;s modulus) of the body  50  and the coil portions  42  and  44  are different, when stress is applied to the coil electronic component  10 , cracks may be created in a portion in which the coil portions  42  and  44  are connected to the external electrodes  851  and  852 . By configuring portions of cross-sectional surfaces or overall cross-sectional surfaces of the connection conductors  31  and  32  to be curved, concentration of stress on edge portions may be prevented such that deformation of the coil electronic component  10  may be significantly reduced as compared to an example in which portions of or overall cross-sectional surfaces of the connection conductors  31  and  32  are configured to be straight. 
     In example embodiments, the coil portions  42  and  44 , the lead-out portions  62  and  64 , and the connection conductors  31  and  32  may be integrated with one another. For example, the first coil portion  42 , the first lead-out portion  62 , and the first connection conductor  31  may be integrated with one another, and the second coil portion  44 , the second lead-out portion  64 , and the second connection conductor  32  may be integrated with one another. A plating resist for forming the coil portions  42  and  44 , the lead-out portions  62  and  64 , and the connection conductors  31  and  32  may be formed in integrated form, and when the coil portions  42  and  44  are plated, the lead-out portions  62  and  64  and the connection conductors  31  and  32  may be plated together with the coil portions  42  and  44 . 
     The dummy lead-out portions  63  and  65  may be disposed on one surface and the other surface of the insulating substrate  23 , opposing each other, to correspond to lead-out portions  62  and  64 , respectively. For example, the first dummy lead-out portion  63  may be disposed on the other surface of the insulating substrate  23 , and may be configured to correspond to the first lead-out portion  62  disposed on one surface of the insulating substrate  23 . The second dummy lead-out portion  65  may be disposed on one surface of the insulating substrate  23 , and may be configured to correspond to the second lead-out portion  64  disposed on the other surface of the insulating substrate  23 . By further including the dummy lead-out portions  63  and  65  having a shape symmetrical to the lead-out portions  62  and  64 , in the coil electronic component  10  in the example embodiment, the external electrodes  851  and  852  may be disposed more symmetrically by a plating process. Thus, the coil electronic component  10  of the example embodiment may be more stably connected to a mounting substrate. 
     Referring to  FIGS. 1 to 4 , the external electrodes  851  and  852  may be connected to the coil portions  42  and  44  through the lead-out portions  62  and  64  and the dummy lead-out portions  63  and  65  disposed in the body  50 . The dummy lead-out portions  63  and  65  may be electrically connected to the lead-out portions  62  and  64  through a via, and may be directly connected to the external electrodes  851  and  852 . As the dummy lead-out portions  63  and  65  are connected to the external electrodes  851  and  852 , adhesion force between the external electrodes  851  and  852  and the body  50  may improve. As the body  50  includes an insulating resin and a magnetic metal material, and the external electrodes  851  and  852  include a conductive metal, the body  50  and the external electrodes  851  and  852  may be formed of different materials and may thus not tend to be mixed with each other. Thus, by disposing the dummy lead-out portions  63  and  65  in the body  50  and exposing the dummy lead-out portions  63  and  65  externally of the body  50 , additional connection between the external electrodes  851  and  852  and the dummy lead-out portions  63  and  65  may be performed. As the connection between the dummy lead-out portions  63  and  65  and the external electrodes  851  and  852  is connection between metals, adhesion force between the dummy lead-out portions  63  and  65  and the external electrodes  851  and  852  may be stronger than adhesion force between the body  50  and the external electrodes  851  and  852 , and thus, adhesion strength of the external electrodes  851  and  852  with the body  50  may improve. 
     At least one of the coil portions  42  and  44 , the via electrode  46 , the lead-out portions  62  and  64 , the connection conductors  31  and  32  and the dummy lead-out portions  63  and  65  may include at least one or more conductive layers. 
     As an example, when the coil portions  42  and  44 , the lead-out portions  62  and  64 , the connection conductors  31  and  32 , the dummy lead-out portions  63  and  65 , and the via electrode  46  are formed on both surfaces of the insulating substrate  23  by a plating process, each of the coil portions  42  and  44 , the lead-out portions  62  and  64 , the connection conductors  31  and  32 , the dummy lead-out portions  63  and  65 , and the via electrode  46  may include a seed such as an electroless plating layer, and an electroplating layer. The electroplating layer may have a single layer structure, or may have a multilayer structure. The electroplating layer having a multilayer structure may be formed in a conformal film structure in which one of the electroplating layers covers the other electroplating layer, or may be formed in a form in which one of the electroplating layers is layered only on one surface of the other electroplating layer. The seed layers of the coil portions  42  and  44 , the seed layers of the lead-out portions  62  and  64 , the seed layers of the connection conductors  31  and  32 , the seed layers of the dummy lead-out portions  63  and  65 , and the seed layer of the via electrode  46  may be integrated with one another such that a boundary may not be formed therebetween, but an example embodiment thereof is not limited thereto. The electroplating layers of the coil portions  42  and  44 , the electroplating layers of the lead-out portions  62  and  64 , the electroplating layers of the connection conductors  31  and  32 , the electroplating layers of the dummy lead-out portions  63  and  65 , and the electroplating layer of the via electrode  46  may be integrated with one another such that a boundary may not be formed therebetween, but an example embodiment thereof is not limited thereto. 
     Each of the coil portions  42  and  44 , the lead-out portions  62  and  64 , the connection conductors  31  and  32 , the dummy lead-out portions  63  and  65 , and the via electrode  46  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, but an example embodiment thereof is not limited thereto. 
     The external electrodes  851  and  852  may be disposed on the first surface  101 , the second surface  102 , and the third surface  103  of the body  50 . 
     In an example embodiment, the external electrodes  851  and  852  may be disposed on the first surface  101  and the third surface  103  of the body  50  to be connected to the first lead-out portion  62  and the second lead-out portion  64  exposed to the first surface  101  and the third surface  103  of the body  50 . An area in which the external electrodes  851  and  852  are disposed may be narrower than a width of the body  50 . The first external electrode  851  may cover the first lead-out portion  62 , may extend from the first surface  101  of the body  50 , and may be disposed on the third surface  103 , and may not be disposed on the fourth surface  104 , the fifth surface  105 , and the sixth surface  106  of the body  50 . The second external electrode  852  may cover the second lead-out portion  64 , may extend from the second surface  102  of the body  50 , and may be disposed on the third surface  103 , and may not be disposed on the fourth surface  104 , the fifth surface  105 , and the sixth surface  106  of the body  50 . 
     The external electrodes  851  and  852  may have a single layer structure or a multilayer structure. Each of the external electrodes  851  and  852  may include a first layer  85   a  covering the lead-out portions  62  and  64 , and a second layer  85   b  covering the first layer  85   a . For example, the first layer  85   a  may include nickel (Ni), and the second layer  85   b  may include tin (Sn) in the coil electronic component  10 . 
     Further Example Embodiment 
       FIG. 7  is a diagram illustrating coil portions of a coil electronic component according to another example embodiment.  FIG. 8  is a diagram illustrating coil portions of a coil electronic component of a modified example of another example embodiment. 
     Referring to  FIGS. 7 and 8 , in the coil electronic component illustrated in the diagrams, shapes of corners of lead-out portions  62  and  64  may be different as compared to the coil electronic component  10  described in the aforementioned example embodiment. Thus, in the example embodiment, only the shapes of the lead-out portions  62  and  64 , different from the example described in the aforementioned example embodiment, will be described. The descriptions of the other elements may be the same as in the aforementioned example embodiment. 
     The lead-out portions  62  and  64  may be disposed in a body  50  and may have an “L” shaped form, and generally, in the lead-out portions  62  and  64  disposed in the body  50 , an edge of the lead-out portions  62  and  64  connecting corners thereof may be configured to be a straight line. Referring to  FIG. 7 , a cross-sectional surface of each of the lead-out portions  62  and  64  disposed in the body  50  may be configured to include at least one portion having a curved shape. Accordingly, a region filled with a magnetic material may increase in the body  50  as compared to the coil electronic component  10  in which cross-sectional surfaces of the lead-out portions  62  and  64  are formed by straight lines. As elasticity rates (Young&#39;s modulus) of the body and the coil portions  42  and  44  are different, when stress is applied to the coil electronic component  10 , cracks may be created in a portion in which the coil portions  42  and  44  are connected to the external electrodes  851  and  852 . Accordingly, by disposing the lead-out portions  62  and  64  such that each of cross-sectional surfaces of the lead-out portions  62  and  64  may have at least one portion having a curved shape in the body  50 , a sufficient distance between an outermost turn of the coil portions  42  and  44  and the lead-out portions  62  and  64  may secured, and stress may be dispersed. Also, by disposing the lead-out portions  62  and  64  such that each of cross-sectional surfaces of the lead-out portions  62  and  64  may have at least one portion having a curved shape, stress concentration may be alleviated as compared to the example in which the cross-sectional surfaces are formed by straight lines, thereby significantly reducing the deformation of the coil electronic component  10 . 
     Referring to  FIG. 8 , overall shapes of cross-sectional surfaces of the lead-out portions  62  and  64  may be configured to be curved. As overall cross-sectional surfaces of the lead-out portions  62  and  64  disposed in the body are configured to have curved shapes, widths of the lead-out portions  62  and  64  in the body  50  may not be uniform. Thus, as compared to the example in which only portions of cross-sectional surfaces of the lead-out portions  62  and  64  have curved shapes, a region filled with a magnetic material may increase in the body  50  and inductance may improve. 
     According to the aforementioned example embodiments, connection reliability between the lead-out portion and the coil portion may be improved. 
     Also, separation between the conductor and the body in the coil electronic component may be prevented such that quality of the coil electronic component may be improved. 
     While the 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.