Patent Publication Number: US-11640870-B2

Title: Coil component

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit of priority to Korean Patent Application No. 10-2018-0110409 filed on Sep. 14, 2018 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to a coil component. 
     BACKGROUND 
     An inductor, a coil component, is a representative passive electronic component used together with a resistor and a capacitor in electronic devices. 
     As electronic devices are designed to have higher performance and to be reduced in size, electronic components used in electronic devices have been increased in number and reduced in size. 
     Accordingly, an inductor has been reduced in size as well. To implement high capacity and to improve a quality factor (Q) while reducing a size of an inductor, it may be necessary to configure a coil to occupy a relatively large area in a small-sized body. 
     In addition to increasing an area of a coil, it may also be necessary to facilitate a flow of magnetic flux to improve a performance of an inductor such as inductance (L), quality factor (Q), and the like. 
     SUMMARY 
     An aspect of the present disclosure is to provide a coil component reduced in size and capable of implementing high capacity by increasing an area occupied by a coil in the same volume. 
     Another aspect of the present disclosure is to provide a coil component having an improved performance in relation to inductance (L), quality factor (Q), and the like, of the coil component by reducing impacts from a mounting substrate and an external electrode which impede a flow of magnetic flux. 
     According to an aspect of the present disclosure, a coil component includes a body having one surface and the other surface opposing each other in a first direction; an internal insulating layer buried in the body; a coil portion disposed in the internal insulating layer, and forming at least one turn centering on an axis in a second direction perpendicular to the first direction; first and second external electrodes disposed on one surface of the body and spaced apart from each other, and connected to the coil portion; an external insulating layer covering the body and exposing the first and second external electrodes. Lengths of the first and second external electrodes taken in the second direction are shorter than a length of the external insulating layer taken in the second direction. 
    
    
     
       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 diagram illustrating a coil component according to an exemplary embodiment in the present disclosure; 
         FIG.  2    is a diagram illustrating a coil component in which some of elements illustrated in  FIG.  1    are omitted; 
         FIG.  3    is a diagram illustrating a coil component, viewing from an A direction according to an exemplary embodiment in the present disclosure; 
         FIG.  4    is a cross-sectional diagram taken along line I-I′ in  FIG.  1   ; and 
         FIG.  5    is a diagram illustrating portion B illustrated in  FIG.  4    in magnified form. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be described as follows with reference to the accompanying drawings. The shape and size of constituent elements in the drawings may be exaggerated or reduced for clarity. 
     The terms used in the exemplary embodiments are used to simply describe an exemplary embodiment, and are not intended to limit the present disclosure. A singular term includes a plural form unless otherwise indicated. The terms used in the exemplary embodiments are used to simply describe an exemplary 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 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 term “disposed on,” “positioned on,” and the like, may indicate that an element is positioned on or below an object, and does not necessarily mean that the element is positioned on the object with reference to a gravity direction. 
     Herein, a lower side, a lower portion, a lower surface, and the like, are used to refer to a direction toward a mounted surface of the fan-out semiconductor package in relation to cross sections of the drawings, while an upper side, an upper portion, an upper surface, and the like, are used to refer to an opposite direction to the direction. However, these directions are defined for convenience of explanation, and the claims are not particularly limited by the directions defined as described above. 
     It can be understood that when an element is referred to with “first” and “second”, the element is not limited thereby. The terms “first,” “second,” etc. may be used only for a purpose of distinguishing the element from the other elements, and may not limit the sequence or importance of the elements. In some cases, a first element may be referred to as a second element without departing from the scope of the claims set forth herein. Similarly, a second element may also be referred to as a first element. 
     The term “an exemplary embodiment” used herein does not refer to the same exemplary embodiment, and is provided to emphasize a particular feature or characteristic different from that of another exemplary embodiment. However, exemplary embodiments provided herein are considered to be able to be implemented by being combined in whole or in part one with another. For example, one element described in a particular exemplary embodiment, even if it is not described in another exemplary embodiment, may be understood as a description related to another exemplary embodiment, unless an opposite or contradictory description is provided therein. 
     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 the other 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 exemplary embodiments in the present disclosure are not limited thereto. 
     In the drawings, a T direction is a first direction or a thickness direction, a W direction is a second direction or a width direction, an L direction is a third direction or a length direction. 
     In the descriptions described with reference to the accompanied drawings, the same elements or elements corresponding to each other will be described using the same reference numerals, and overlapped descriptions will not be repeated. 
     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 inductor, a general bead, a high frequency bead, a common mode filter, and the like. 
     In the description below, a coil component according to an exemplary embodiment will be described, and an example in which a coil component is implemented as a power inductor will be described. However, an exemplary embodiment of the coil component is not limited thereto, and coil components other than an inductor may not be excluded from a scope of the exemplary embodiment. 
       FIG.  1    is a schematic diagram illustrating a coil component according to an exemplary embodiment.  FIG.  2    is a diagram illustrating a coil component in which some of elements illustrated in  FIG.  1    are omitted.  FIG.  3    is a diagram illustrating a coil component, viewing from an A direction according to an exemplary embodiment.  FIG.  4    is a cross-sectional diagram taken along line I-I′ in  FIG.  1   .  FIG.  5    is a diagram illustrating portion B illustrated in  FIG.  4    in magnified form. 
     Referring to  FIGS.  1  to  5   , a coil component  1000  may include a body  100 , an internal insulating layer IL, a coil portion  200 , external electrodes  300  and  400 , and an external insulating layer  500 . 
     The body  100  may have a hexahedral shape. 
     Referring to  FIGS.  1  to  4   , the body  100  may include a first surface  101  and a second surface  102  opposing each other in a length direction L, a third surface  103  and a fourth surface  104  opposing each other in a width direction W, a fifth surface  105  and a sixth surface  106  opposing each other in a thickness direction T. The first to fourth surfaces  101 ,  102 ,  103 , and  104  of the body  100  may be walls of the body  100  connecting the fifth surface  105  and the sixth surface  106  of the body  100 . In the description below, “both front and rear surfaces of the body” may refer to the first surface  101  and the second surface  102 , “both side surfaces of the body” may refer to the third surface  103  and the fourth surface  104 , and “one surface and the other surface” of the body  100  may refer to the fifth surface  105  and the sixth surface  106  of the body  100 . 
     As an example, the body  100  may be configured such that the coil component  1000  in which the external electrodes  300  and  400  and the external insulating layer  500  are disposed, which will be described later, may have a length of 1.0 mm, a width of 0.6 mm, and a thickness of 0.8 mm, but an exemplary embodiment thereof is not limited thereto. 
     The body  100  may include a magnetic material and a resin material. For example, the body  110  may be formed by layering one or more magnetic composite sheets including a magnetic material dispersed in a resin. 
     The magnetic material may be a ferrite or a magnetic metal powder. 
     The ferrite powder may include, for example, one or more materials among a spinel ferrite such as an Mg—Zn ferrite, an Mn—Zn ferrite, an Mn—Mg ferrite, a Cu—Zn ferrite, an Mg—Mn—Sr ferrite, an Ni—Zn ferrite, and the like, a hexagonal ferrite such as a Ba—Zn ferrite, a Ba—Mg ferrite, a Ba—Ni ferrite, a Ba—Co ferrite, a Ba—Ni—Co ferrite, and the like, a garnet ferrite such as a Y ferrite, and a Li ferrite. 
     The magnetic metal powder may include one or more materials selected from a 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 may be one or more materials among a pure iron powder, a Fe—Si alloy powder, a Fe—Si—Al alloy powder, a Fe—Ni alloy powder, a Fe—Ni—Mo alloy powder, Fe—Ni—Mo—Cu alloy powder, a Fe—Co alloy powder, a Fe—Ni—Co alloy powder, a Fe—Cr alloy powder, a Fe—Cr—Si alloy powder, a Fe—Si—Cu—Nb alloy powder, a Fe—Ni—Cr alloy powder, and a Fe—Cr—Al alloy powder. 
     The magnetic metal powder may be amorphous or crystalline. For example, the magnetic metal powder may be a Fe—Si—B—Cr amorphous alloy powder, but an example of the magnetic metal powder is not limited thereto. 
     The ferrite and the magnetic metal powder may have an average diameter of 0.1 μm to 30 μm, but an example of the average diameter is not limited thereto. 
     The body  100  may include two or more types of magnetic materials dispersed in a resin. The notion that types of the magnetic materials are different may indicate that one of an average diameter, a composition, crystallinity, and a form of one of magnetic materials is different from those of the other magnetic material. 
     The resin may include one of an epoxy, a polyimide, a liquid crystal polymer, or mixture thereof, but an example of the resin is not limited thereto. 
     The body  100  may include a core  110  penetrating through a coil portion  200 , which will be described later. The core  110  may be formed by filling a through hole of the coil portion  200  with magnetic composite sheets, but an exemplary embodiment thereof is not limited thereto. 
     The internal insulating layer IL may be buried in the body  100 . For example, the internal insulating layer IL may have a planar shape, and the internal insulating layer IL having a planar shape may be buried in the body  100  in a form in which the internal insulating layer IL is substantially parallel to a thickness direction of the body  100 . In other words, the internal insulating layer IL may be disposed to substantially be perpendicular to the fifth and sixth surfaces  105  and  106  of the body  100 . The internal insulating layer IL may support the coil portion  200 . The notion that the internal insulating layer IL having a planar shape is substantially perpendicular to the fifth and sixth surfaces  105  and  106  of the body  100  may indicate that both surfaces of the internal insulating layer IL opposing each other and having the largest area among a plurality of surfaces of the internal insulating layer IL may be disposed to substantially be parallel to the first direction of the body  100  such that the both surfaces of the internal insulating layer IL may substantially and respectively be perpendicular to the fifth and sixth surfaces  105  and  106  of the body  100 . 
     The internal insulating layer IL 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 internal insulating layer IL 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), and the like, but an example of the material of the internal insulating layer is not limited thereto. 
     As an inorganic filler, one or more materials 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 internal insulating layer IL is formed of an insulating material including a reinforcing material, the internal insulating layer IL may provide improved stiffness. When the internal insulating layer IL is formed of an insulating material which does not include a glass fiber, the internal insulating layer IL may be desirable to reducing an overall thickness of the coil portion  200 . When the internal insulating layer IL is formed of an insulating material including a photosensitive insulating resin, the number of processes for forming the coil portion  200  may be reduced such that manufacturing costs may be reduced, and a fine hole may be processed. 
     The coil portion  200  may be buried in the body  100 , and may embody properties of the coil component. For example, the coil component  1000  may be implemented as a power inductor as described above, and in this case, the coil portion  200  may store electric fields as magnetic fields such that an output voltage may be maintained, thereby stabilizing power of an electronic device. 
     The coil portion  200  may include a first coil pattern  211 , a second coil pattern  212 , and a via  220 . 
     The first coil pattern  211 , the second coil pattern  212 , and the internal insulating layer IL may be layered in order in a thickness direction T of the body  100  such that the first coil pattern  211 , the second coil pattern  212 , and the internal insulating layer IL may be disposed to substantially be perpendicular to the fifth and sixth surfaces  105  and  106  of the body  100 . 
     The first coil pattern  211  and the second coil pattern  212  each may have a planar spiral shape. For example, the first coil pattern  211  may form at least one turn on one surface of the internal insulating layer IL centering on an axis in a thickness direction T of the body  100 . 
     The via  220  may penetrate through the internal insulating layer IL to electrically connect the first coil pattern  211  and the second coil pattern  212 , and may be in contact with the first coil pattern  211  and the second coil pattern  212 . 
     Accordingly, the coil portion  200  in the exemplary embodiment may be formed as a single coil generating a magnetic field in a width direction W of the body  100 . The notion that the coil portion  200  generates a magnetic field in a width direction W of the body  100  may indicate that a direction of a magnetic field in a core portion  110  may substantially be parallel to a width direction W of the body  100 . 
     At least one of the first coil pattern  211 , the second coil pattern  212 , and the via  220  may include at least one or more of conductive layers. 
     For example, when the second coil pattern  212  and the via  220  are formed through a plating process, the second coil pattern  212  and the via  220  each may have a seed layer such as an electroless plating layer, and an electroplating layer. The electroless plating layer may have a single-layer structure, or may have a multiple-layer structure. The electroplating layer having a multiple-layer structure may have a conformal film structure in which one of the electroplating layers is covered by the other electroplating layer, or may have a form in which one of the electroplating layers is disposed on one surface of the other plating layers. The seed layer of the second coil pattern  212 , and the seed layer of the via  220  may be integrated with each other such that no boundary may be formed between the seed layers, but an exemplary embodiment thereof is not limited thereto. Also, an electroplating layer of the second coil pattern  212  and an electroplating layer of the via  220  may be integrated with each other such that no boundary may be formed between the electroplating layers, but an exemplary embodiment thereof is not limited thereto. 
     As another example, when the coil portion  200  is formed by, after forming the first coil pattern  211  and the second coil pattern  212  individually, layering the first coil pattern  211  and the second coil pattern  212 , the via  220  may include a metal layer having a high melting point, and a metal layer having a low melting point relatively lower than the melting point of the metal layer having a high melting point. The metal layer having a low melting point may be formed of a solder including lead (Pb) and/or tin (Sn). The metal layer having a low melting point may have at least a portion melted due to pressure and temperature generating during the layering process, and an inter-metallic compound layer (IMC layer) may be formed between the metal layer having a low melting point and the second coil pattern  212 , for example. 
     As an example, the first coil pattern  211  and the second coil pattern  212  may be formed on and protrude from the internal insulating layer IL. As another example, the first coil pattern  211  may be buried in one surface of the internal insulating layer IL, and one surface of the first coil pattern  211  may be exposed to one surface of the internal insulating layer IL, and the second coil pattern  212  may be formed on and protrude from the other surface of the internal insulating layer IL. In this case, a concave portion may be formed on one surface of the first coil pattern  211 , and one surface of the internal insulating layer IL and one surface of the first coil pattern  211  may not be coplanar with each other. As another example, the first coil pattern  211  may be buried in one surface of the internal insulating layer IL, and one surface of the first coil pattern  211  may be exposed to one surface of the internal insulating layer IL, and the second coil pattern  212  may be buried in the other surface of the internal insulating layer IL, and the other surface of the second coil pattern  212  may be exposed to the other surface of the internal insulating layer IL. 
     Ends of the first coil pattern  211  and the second coil pattern  212  may be exposed respectively to the first surface  101  and the second surface  102  of the body  100 . The first coil pattern  211  may be electrically connected to the first external electrode  300 , which will be described later, as the end exposed to the first surface of the body  100  is in contact with the first external electrode  300 . The second coil pattern  212  may be electrically to the second external electrode  400 , which will be described later, as the end exposed to the second surface of the body  100  is in contact with the second external electrode  400 . 
     The first coil pattern  211 , the second coil pattern  212 , and the via  220  each may include a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof, but an example of the material is not limited thereto. 
     Although not illustrated, at least one of the first coil pattern  211  and the second coil pattern  212  may be formed as a plurality of coil patterns. For example, the coil portion  200  may have a structure in which a plurality of the first coil patterns  211  are formed, and one of the first coil patterns  211  is formed on one surface of the other first coil pattern  211 . In this case, an additional insulating layer may be disposed between the plurality of first coil patterns  211 . 
     The external electrodes  300  and  400  may be disposed on one surface of the body  100 , and may be connected to the coil portion  200 . 
     The external electrodes  300  and  400  may include the first external electrode  300  connected to the first coil pattern  211 , and the second external electrode  400  connected to the second coil pattern  212 . For example, the first external electrode  300  may include a first connection portion  310  disposed on the first surface  101  of the body  100  and being in contact with ends of the first coil pattern  211 , and a first extended portion  320  extending from the first connection portion  310  to the fifth surface  105  of the body  100 . The second external electrode  400  may include a second connection portion  410  disposed on the second surface  102  of the body  100  and being in contact with ends of the second coil pattern  212 , and a second extended portion  420  extending from the second connection portion  410  to the fifth surface  105  of the body  100 . The first extended portion  320  and the second extended portion  420  disposed on the fifth surface  105  of the body  100  may be spaced apart from each other such that the first external electrode  300  and the second external electrode  400  may not be directly in contact with each other. 
     The external electrodes  300  and  400  may electrically connect the coil component  1000  to a printed circuit board, and the like, when the coil component  1000  is mounted on the printed circuit board, and the like. As an example, the coil component  1000  in the exemplary embodiment may be mounted such that the fifth surface  105  of the body  100  faces an upper surface of a printed circuit board, and the extended portions  320  and  420  of the external electrodes  300  and  400  disposed on the fifth surface of the body  100  may be electrically connected to a connecting portion of the printed circuit board. 
     The external electrodes  300  and  400  may include at least one of a conductive resin layer and an electroplating layer. The conductive resin layer may be formed through a printing process, and may include a thermosetting resin, and one or more of conductive metals selected from a group consisting of copper (Cu), nickel (Ni), and silver (Ag). The electroplating layer may include one or more materials selected from a group consisting of nickel (Ni), copper (Cu), and tin (Sn). 
     For example, the external electrodes  300  and  400  in the exemplary embodiment each may include a copper plated layer directly formed on a surface of the body  100  through an electroplating process. 
     The external insulating layer  500  may cover the body  100 , and may expose the first and second external electrodes  300  and  400 . In other words, the external insulating layer  500  may cover the first to sixth surfaces  101 ,  102 ,  103 ,  104 ,  105 , and  106  of the body  100 , and an exposing portion  510  exposing regions in which the external electrodes  300  and  400  are formed among surfaces of the body  100  may be formed. The exposing portion  510  may expose at least portions of the first and second surfaces  101  and  102  of the body  100  and at least a portion of the fifth surface  105  of the body  100 . In other words, the exposing portion  510  may expose regions in which the connection portions  310  and  410  and the extended portions  320  and  420  are formed among surfaces of the body  100 . 
     The external insulating layer  500  may include a thermoplastic resin such as a polystyrene resin, a vinyl acetate resin, a polyester resin, a polyethylene resin, a polypropylene resin, a polyamide resin, a rubber resin, an acrylic resin, and the like, or a thermosetting resin such as a phenolic resin, an epoxy resin, a urethane resin, a melamine resin, an alkyd resin, and the like. 
     The external insulating layer  500  may be formed by layering a plurality of insulating films on each of the first to sixth surfaces  101 ,  102 ,  103 ,  104 ,  105 , and  106  of the body  100 , or by dipping the body  100  in an insulating resin. In the former example above, the external insulating layer  500  may be configured such that boundaries may be formed among the plurality of insulating films, and in the later example above, the external insulating layer  500  may be formed in integrated form without boundaries. 
     The external insulating layer  500  may have a thickness within a range from 10 nm to 100 μm. When a thickness of the external insulating layer  500  is lower than 10 nm, properties of a coil component such as a Q factor may reduce, and when a thickness of the external insulating layer  500  is greater than 100 μm, an overall length, width, and thickness of the coil component may increase such that it may be difficult to reduce a size of the coil component. 
     The exposing portion  510  may be formed by, after forming the external insulating layer  500  to cover the first to sixth surfaces  101 ,  102 ,  103 ,  104 ,  105 , and  106  of the body  100 , removing a portion of the external insulating layer  500 . Alternatively, the exposing portion  510  may be formed by selectively forming the external insulating layer  500  in a region other than regions in which the external electrodes  300  and  400  are formed among the first to sixth surfaces  101 ,  102 ,  103 ,  104 ,  105 , and  106  of the body  100 . In the former example above, the exposing portion  510  may be formed by removing a portion of the external insulating layer  500  using a laser, through an etching process, or the like. 
     When the exposing portion  510  is formed on the external insulating layer  500  using a laser, through an etching process, or the like, a portion of the body  100  may be removed along with the external insulating layer  500 . Thus, a recess R may be formed in regions of the body  100  (a region corresponding to the exposing portion  510 ) in which the external electrodes  300  and  400  are disposed. 
     The exposing portion  510  may be formed between both ends of the external insulating layer  500  disposed in a width direction of the body  100 . In other words, a finish portion  520  of the external insulating layer  500  may be disposed in each of outer portions of both ends of the exposing portion  510  disposed in a width direction W of the body  100 . Accordingly, distance L 2  between both ends of the external electrodes  300  and  400  opposing each other in a width direction W of the body  100  may be configured to be shorter than distance L 1  between both ends of the external insulating layer  500  opposing each other in a width direction W of the body  100 , and a finish portion  520  of the external insulating layer  500  may be disposed in outer portions of both side surfaces of the external electrodes  300  and  400  opposing each other in a width direction W of the body  100  such that the both side surfaces of the external electrodes  300  and  400  opposing each other in a width direction W of the body  100  may be covered. 
     In the exemplary embodiment, the external electrodes  300  and  400  may include the connection portions  310  and  410  and the extended portions  320  and  420 , and thus, the finish portion  520  may be disposed on the first and second surfaces  101  and  102  of the body  100  on which the connection portions  310  and  410  are formed, and on the fifth surface  105  of the body  100  on which the extended portions  320  and  420  are formed. 
     By the finish portion  520 , widths of the external electrodes  300  and  400  may be formed to be smaller than a width of the external insulating layer  500 , a width of the coil component, and the external electrodes  300  and  400  may be disposed between both ends of the external insulating layer  500  in a width direction. Accordingly, in the coil component  1000  in the exemplary embodiment, the number of a coupling member such as a solder, and the like, may be reduced when the coil component is mounted on a printed circuit board. In other words, an increase of a substantial mounting area of the coil component on a printed circuit board, which should be determined in consideration of spreading of a solder, and the like, rather than a width and a length of the coil component, may be prevented. 
     Lengths L 4  of the connection portions  310  and  410  taken in a first direction may be shorter than a length L 3  of the external insulating layer  500  taken in the first direction. When the coil component is mounted, a coupling member such as a solder, and the like, may climb the connection portions  310  and  410  and may extend onto both front and rear surfaces of the body  100 . The issue above may be prevented by configuring the lengths L 4  of the connection portions  310  and  410  taken in the first direction of the body  100  to be shorter than the length L 3  of the external insulating layer  500  taken in the first direction of the body  100 . 
     A ratio between the length L 3  of the external insulating layer  500  taken in the first direction and the lengths L 4  of the connection portions  310  and  410  taken in the first direction may be greater than 0 and may be 0.5 or less. When the ratio between the length L 3  of the external insulating layer  500  taken in the first direction and the lengths L 4  of the connection portions  310  and  410  taken in the first direction is greater than 0.5, a volume of a coupling member such as a solder, and the like, extending onto both front and rear surfaces of the body  100  may increase such that a substantial mounting area of the coil component on a printed circuit board may excessively increase greater than a width and a length of the coil component. 
     Although not illustrated, the coil component  1000  may further include an insulating film formed along surfaces of the first coil pattern  211 , the internal insulating layer IL, and the second coil pattern  212 . The insulating film may protect and insulate the coil patterns  211  and  212 , and may include an insulating material such as a parylene, and the like. An insulating material included in the insulating film may not be limited to any particular material. The insulating film may be formed through a vapor deposition process, and the like, but the method of forming the insulating film is not limited thereto. The insulating film may be formed by layering the insulating films on both surfaces of the internal insulating layer IL on which the first and second coil patterns  211  and  212  are formed. 
     According to the aforementioned exemplary embodiments, even when a size of the coil component is reduced, high capacity may be implemented. 
     Further, by significantly reducing impacts from a mounting substrate and an external electrode which impede a flow of magnetic flux of a coil component, a performance of a coil component such as inductance (L), quality factor (Q), and the like, may improve. 
     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.