Coil electronic component

Abstract

Disclosed is a coil electronic component including: a body including a first magnetic body and a second magnetic body facing the first magnetic body; a first coil, at least a portion of which is embedded in the first magnetic body; and a second coil, at least a portion of the second coil is embedded in the second magnetic body, the first magnetic body is an integrated structure having a recess, and the first coil is disposed in the recess.

Description

Technical Field

[0001] The present disclosure relates to a coil electronic assembly. Background Art

[0002] Recently, the functions of mobile devices have been diversified, which has increased power consumption. In order to extend the operating time of a battery in a mobile device, coil electronic components with low loss and high efficiency are adopted around a power management integrated circuit (PMIC).

[0003] In the case where a coil electronic component has a coupled inductor structure in which a first coil and a second coil are arranged vertically, a method capable of easily adjusting a coupling coefficient (k) while ensuring high inductance is required.

[0004] In addition, during the process of stacking the first coil and the second coil, it is necessary to prevent the first coil and the second coil from being misaligned with each other. Summary of the invention

[0005] The present disclosure attempts to provide a coil electronic component having a coupled inductor structure and capable of easily adjusting a coupling coefficient while ensuring high inductance.

[0006] The present disclosure also seeks to provide a coil electronic component having a coupled inductor structure and capable of preventing misalignment of stacked coils.

[0007] However, the objects to be achieved by the present disclosure are not limited to the above-mentioned objects, but can be variously extended without departing from the technical spirit of the present disclosure.

[0008] According to an embodiment, a coil electronic component includes: a main body, including a first magnetic body and a second magnetic body facing the first magnetic body; a first coil, at least a portion of the first coil is embedded in the first magnetic body; and a second coil, at least a portion of the second coil is embedded in the second magnetic body, wherein the first magnetic body is an integrated structure having a recess, and the first coil is arranged in the recess.

[0009] In addition, the first magnetic body may include a base, a protrusion protruding from the base, and a support portion spaced apart from the protrusion and protruding from the base, the recess is defined by the base, the protrusion, and the support portion, and the first coil is wound around the protrusion.

[0010] In addition, the body may further include a third magnetic body located between the first magnetic body and the second magnetic body.

[0011] Additionally, an outer surface of the third magnetic body and an outer surface of the first magnetic body may form a portion of an outer surface of the body.

[0012] In addition, the third magnetic body may at least partially contact the second coil and the second magnetic body.

[0013] In addition, the height of the protrusion and the height of the support may be different.

[0014] In addition, the third magnetic body may at least partially contact the first coil, the protrusion, and the support portion.

[0015] In addition, the first coil may be surrounded by the base, the protrusion, the support, and the third magnetic body.

[0016] In addition, the third magnetic body may include a portion located between the first coil and the protrusion.

[0017] In addition, the third magnetic body may include a portion located between the first coil and the support portion.

[0018] In addition, the aspect ratio of the first coil may be 1.25:1 or greater and 5:1 or less, and the aspect ratio of the second coil may be 1.25:1 or greater and 5:1 or less, wherein the aspect ratio is defined as the ratio of the thickness to the width of a cross-section of the first coil or the second coil.

[0019] In addition, a coupling coefficient between the first coil and the second coil may be 0.17 or more and 0.33 or less.

[0020] In addition, the coil electronic component may also include: a first external electrode, which is arranged outside the main body and connected to the first lead-out portion of the first coil; a second external electrode, which is arranged outside the main body and connected to the second lead-out portion of the first coil; a third external electrode, which is arranged outside the main body and connected to the first lead-out portion of the second coil; and a fourth external electrode, which is arranged outside the main body and connected to the second lead-out portion of the second coil.

[0021] In addition, the first external electrode and the second external electrode may each include a first electrode layer connected to the first coil, a second electrode layer covering the first electrode layer, and a third electrode layer covering the second electrode layer, and the third external electrode and the fourth external electrode may each include a fourth electrode layer connected to the second coil, a fifth electrode layer covering the fourth electrode layer, and a sixth electrode layer covering the fifth electrode layer.

[0022] In addition, the first electrode layer and the fourth electrode layer may each include copper (Cu).

[0023] In addition, the first electrode layer and the fourth electrode layer may each be a conductive resin layer.

[0024] In addition, the coil electronic component may further include an insulating layer covering a surface of the body between the first external electrode, the second external electrode, the third external electrode, and the fourth external electrode.

[0025] In addition, the coil electronic component may further include an insulating film on a surface of the first coil and a surface of the second coil.

[0026] In addition, the third magnetic body may have a magnetic permeability different from those of the first and second magnetic bodies.

[0027] In addition, the third magnetic body may include a material different from that of the first and second magnetic bodies.

[0028] In addition, the first magnetic body, the second magnetic body, and the third magnetic body may each include metal magnetic particles made of a soft magnetic alloy.

[0029] A coil electronic component according to an embodiment includes: a first coil having a first lead-out portion and a second lead-out portion; a second coil having a third lead-out portion and a fourth lead-out portion, the second coil being magnetically coupled to the first coil; a first magnetic body including an integrated structure, the integrated structure including a base, a protrusion protruding from a central area of ​​an upper surface of the base, and a support protruding from a peripheral area of ​​the upper surface of the base and spaced apart from the protrusion; a first external electrode, a second external electrode, a third external electrode, and a fourth external electrode arranged on a bottom surface of the base, wherein the first coil is wound around the protrusion, wherein the base includes a first groove and a second groove respectively arranged at opposite sides in a length direction across a front surface of the base and a third groove and a fourth groove respectively arranged at opposite sides in a length direction across a rear surface of the base opposite to the front surface, and wherein the first lead-out portion, the second lead-out portion, the third lead-out portion, and the fourth lead-out portion are respectively connected to the first external electrode, the second external electrode, the third external electrode, and the fourth external electrode via the first groove, the second groove, the third groove, and the fourth groove, respectively.

[0030] According to the coil electronic component according to the embodiment, it is possible to easily adjust the coupling coefficient while ensuring high inductance.

[0031] According to the coil electronic component according to the embodiment, it is possible to prevent stacked coils from being misaligned. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1is a perspective view schematically showing a coil electronic component according to an embodiment.

[0033] Figure 2 It is schematically shown Figure 1 A top view of the coil electronics assembly in Figure 1.

[0034] Figure 3 It is schematically shown Figure 1 Bottom view of the coil electronics assembly in FIG.

[0035] Figure 4 It is along Figure 1 Schematic cross-sectional view taken along line IV-IV' in FIG.

[0036] Figure 5 It is schematically shown Figure 1 A stereoscopic view of a first magnetic body of a coil electronics assembly.

[0037] Figure 6 It is along Figure 5 Schematic cross-sectional view taken along line VI-VI'.

[0038] Figure 7 is a cross-sectional view schematically showing a first magnetic body of a coil electronic component according to a modified example.

[0039] Figure 8 is a perspective view schematically showing a first magnetic body of a coil electronic component according to another modified example.

[0040] Fig. 9 Schematically shows a coil electronic component according to another embodiment Figure 4 The corresponding cross-sectional view.

[0041] <Description of Reference Numerals> 1000: Coil electronic components 100: Main body 110: First magnetic body 111: Base 113: Protrusion 115: Support 117: concave part 120: Second magnetic body 123: Second core 130: Third magnetic body 200: First coil 210: Winding Department 220: Lead-out 223: First lead-out section 225: Second lead-out section 300: Second coil 310: Winding 320: Lead-out 323: First lead-out section 325: Second lead-out section 500: First outer electrode 600: Second outer electrode 700: Third outer electrode 800: Fourth outer electrode 900: Insulation layer IF: Insulating film. DETAILED DESCRIPTION

[0042] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that a person skilled in the art to which the present disclosure belongs can easily perform the embodiments. In the accompanying drawings, parts irrelevant to the description will be omitted to clearly describe the present disclosure, and the same or similar constituent elements will be represented by the same reference numerals throughout the specification. Some constituent elements in the accompanying drawings are shown or omitted in an exaggerated or schematic form. The size of each constituent element does not fully reflect the actual size.

[0043] In addition, it should be understood that the drawings are provided only to enable those skilled in the art to easily understand the embodiments disclosed in this specification, and that the technical spirit disclosed in this specification is not limited by the drawings, and that the present disclosure includes all changes, equivalents, and alternatives contained in the technical spirit and technical scope of the present disclosure.

[0044] Terms including ordinal numbers such as "first", "second", etc. may be used to describe various constituent elements, but the constituent elements are not limited by the terms. These terms are only used to distinguish one constituent element from another constituent element.

[0045] In addition, when a component (such as a layer, film, region, or plate) is described as being "above" or "on" another component, the component may be "directly" "on" the other component, and the component may also be on the other component with other components interposed therebetween. Conversely, when a component is described as being "directly" "above" another component, there are no components between them. In addition, when a component is described as being "above" or "on" a reference component, the component may be "above" or "below" the reference component, and such a configuration does not necessarily mean that the component is "above" or "on" the reference component in a direction opposite to the direction of gravity.

[0046] Throughout the specification, it should be understood that the terms "comprises", "includes", "contains", "has" or other variations thereof are inclusive, thus specifying the presence of the features, quantities, steps, operations, elements, components or combinations thereof, but not excluding the presence or addition of one or more other features, quantities, steps, operations, elements, components or combinations thereof. Therefore, unless explicitly described to the contrary, the words "includes / comprising" and variations thereof will be understood to imply the inclusion of the stated elements without excluding any other elements.

[0047] In addition, throughout the specification, the phrase "in a plan view" means observing an object from above, and the phrase "in a cross-sectional view" means observing a cross section obtained by vertically cutting the object from a lateral side.

[0048] Furthermore, throughout the specification, when one constituent element is referred to as being “connected to” another constituent element, one constituent element may be “directly connected to” another constituent element, and one constituent element may also be “indirectly connected to”, “physically connected to”, or “electrically connected to” another constituent element with other elements interposed therebetween. Furthermore, constituent elements are defined as different names according to their positions or functions, but the constituent elements may be integrated.

[0049] Figure 1 is a perspective view schematically showing a coil electronic component according to an embodiment, Figure 2 It is schematically shown Figure 1 A top view of the coil electronics assembly in Figure 3 It is schematically shown Figure 1 Bottom view of the coil electronics assembly in Figure 4 It is along Figure 1 A schematic cross-sectional view taken along line IV-IV' in FIG. Figure 5 It is schematically shown Figure 1 A perspective view of a first magnetic body of a coil electronic assembly, Figure 6 It is along Figure 5 A schematic cross-sectional view taken along line VI-VI' in FIG. Figure 7 is a cross-sectional view schematically showing a first magnetic body of a coil electronic component according to a modified example, Figure 8 is a perspective view schematically showing a first magnetic body of a coil electronic component according to another modified example.

[0050] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8, the coil electronic component 1000 according to the embodiment includes a body 100 , a first coil 200 , a second coil 300 , a first external electrode 500 , a second external electrode 600 , a third external electrode 700 , and a fourth external electrode 800 .

[0051] The main body 100 may have an approximately right parallelepiped shape. However, the present embodiment is not limited thereto. Due to the shrinkage of the magnetic powder during the sintering process, the main body 100 may have a substantially right parallelepiped shape rather than a perfect right parallelepiped shape. For example, the main body 100 has an approximately right parallelepiped shape, but a portion of the main body 100 corresponding to an edge or vertex may have a rounded shape.

[0052] In this embodiment, for the convenience of description, two surfaces of the main body 100 opposite to each other in the length direction (L-axis direction) are respectively defined as a first surface S1 and a second surface S2, two surfaces of the main body 100 opposite to each other in the width direction (W-axis direction) are respectively defined as a third surface S3 and a fourth surface S4, and two surfaces of the main body 100 opposite to each other in the thickness direction (T-axis direction) are respectively defined as a fifth surface S5 and a sixth surface S6.

[0053] Based on an optical microscope or scanning electron microscope (SEM) photograph of a cross section (taken in the length direction (L axis direction) and the thickness direction (T axis direction)) of the central portion of the coil electronic component 1000 in the width direction (W axis direction), the length of the coil electronic component 1000 may refer to the maximum value of the lengths of a plurality of line segments connecting the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the length direction (L axis direction) and parallel to the length direction (L axis direction) shown in the above cross-sectional photograph. Alternatively, the length of the coil electronic component 1000 may refer to the minimum value of the lengths of a plurality of line segments connecting the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the length direction (L axis direction) and parallel to the length direction (L axis direction) shown in the above cross-sectional photograph. Optionally, the length of the coil electronic component 1000 may refer to the arithmetic mean of the lengths of at least two of the multiple line segments connecting the two outermost boundary lines of the coil electronic component 1000 shown in the photograph of the above cross section that are opposite to each other in the length direction (L-axis direction) and are parallel to the length direction (L-axis direction).

[0054] Based on an optical microscope or scanning electron microscope (SEM) photograph of a cross section (taken in the length direction (L axis direction) and the thickness direction (T axis direction)) of the central portion of the coil electronic component 1000 in the width direction (W axis direction), the thickness of the coil electronic component 1000 may refer to the maximum value of the lengths of a plurality of line segments connecting the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the thickness direction (T axis direction) and parallel to the thickness direction (T axis direction) shown in the above cross section photograph. Alternatively, the thickness of the coil electronic component 1000 may refer to the minimum value of the lengths of a plurality of line segments connecting the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the thickness direction (T axis direction) and parallel to the thickness direction (T axis direction) shown in the above cross section photograph. Optionally, the thickness of the coil electronic component 1000 may refer to the arithmetic mean of the lengths of at least two of the multiple line segments connecting the two outermost boundary lines of the coil electronic component 1000 shown in the photograph of the above cross section that are opposite to each other in the thickness direction (T-axis direction) and are parallel to the thickness direction (T-axis direction).

[0055] Based on an optical microscope or scanning electron microscope (SEM) photograph of a cross section (taken in the length direction (L axis direction) and the width direction (W axis direction)) of the central portion of the coil electronic component 1000 in the thickness direction (T axis direction), the width of the coil electronic component 1000 may refer to the maximum value of the lengths of a plurality of line segments connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross section photograph that are opposite to each other in the width direction (W axis direction) and are parallel to the width direction (W axis direction). Alternatively, the width of the coil electronic component 1000 may refer to the minimum value of the lengths of a plurality of line segments connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross section photograph that are opposite to each other in the width direction (W axis direction) and are parallel to the width direction (W axis direction). Optionally, the width of the coil electronic component 1000 may refer to the arithmetic mean of the lengths of at least two of the multiple line segments connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above-mentioned cross-sectional photograph that are opposite to each other in the width direction (W-axis direction) and parallel to the width direction (W-axis direction).

[0056] In addition, the length, width, and thickness of the coil electronic component 1000 can be measured by a micrometer measurement method. The micrometer measurement method can be performed in the following manner: the zero point is set by using a micrometer with a gauge R&R (repeatability and reproducibility), the coil electronic component 1000 according to the present embodiment is inserted between the tips of the micrometer, and the measuring rod of the micrometer is rotated. In addition, when the length of the coil electronic component 1000 is measured by using the micrometer measurement method, the length of the coil electronic component 1000 may refer to a value measured once or an arithmetic mean of values ​​measured multiple times. This is also applicable to the measurement of the width and thickness of the coil electronic component 1000.

[0057] The body 100 forms the appearance of the coil electronic component 1000 and provides a space for forming a magnetic circuit when current is applied to the first coil 200 through the first and second external electrodes 500 and 600 and current is applied to the second coil 300 through the third and fourth external electrodes 700 and 800, which is a route through which the magnetic flux induced by the first coil 200 and the magnetic flux induced by the second coil 300 pass.

[0058] The body 100 surrounds and encloses the first coil 200 and the second coil 300, and includes a magnetic material. The body 100 may include magnetic particles and an insulating material interposed between the magnetic particles.

[0059] For example, the body 100 may include a first magnetic body 110, a second magnetic body 120, and a third magnetic body 130. The first magnetic body 110, the second magnetic body 120, and the third magnetic body 130 may include magnetic particles and insulating materials between the magnetic particles, respectively. The first magnetic body 110, the second magnetic body 120, and the third magnetic body 130 will be described below. At least a portion of the first coil 200 may be embedded in the first magnetic body 110, and at least a portion of the second coil 300 may be embedded in the second magnetic body 120.

[0060] The magnetic particles may include first metal magnetic particles, second metal magnetic particles and third metal magnetic particles, the particle size of the second metal magnetic particles is larger than the particle size of the first metal magnetic particles, and the particle size of the third metal magnetic particles is larger than the particle size of the second metal magnetic particles. 50 The average particle size D of the second metal magnetic particles may be greater than or equal to 0.1 μm and less than or equal to 0.2 μm. 50 The average particle size D of the third metal magnetic particles may be greater than or equal to 1 μm and less than or equal to 2 μm. 50 It may be greater than or equal to 25 μm and less than or equal to 30 μm.

[0061] The magnetic particles may be ferrite particles or metal magnetic particles exhibiting magnetism.

[0062] For example, the ferrite particles 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 or Ni-Zn-based ferrite) particles, hexagonal ferrite (such as Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite or Ba-Ni-Co-based ferrite) particles, garnet-type ferrite (such as Y-based ferrite) particles and Li-based ferrite particles.

[0063] The metal magnetic particles may include two or more types of particles having different compositions, and include one or more types selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metal magnetic particles may be made of pure iron or a soft magnetic alloy. In the case where the metal magnetic particles are made of a soft magnetic alloy, the metal magnetic particles may be made of one or more of a Fe-Si-based alloy, a Fe-Si-Al-based alloy, a Fe-Ni-based alloy, a Fe-Ni-Mo-based alloy, a Fe-Ni-Mo-Cu-based alloy, a Fe-Co-based alloy, a Fe-Ni-Co-based alloy, a Fe-Cr-based alloy, a Fe-Cr-Si-based alloy, a Fe-Si-Cu-Nb-based alloy, a Fe-Ni-Cr-based alloy, and a Fe-Cr-Al-based alloy. In this case, the different compositions of the metal magnetic particles may also mean different contents.

[0064] The metal magnetic particles may be amorphous or crystalline. For example, the metal magnetic particles may be made of Fe-Si-B-Cr based amorphous alloy. However, the present embodiment is not limited thereto. The average particle size of the metal magnetic particles may be about 0.1 μm to about 30 μm. However, the present embodiment is not limited thereto. In this specification, the average particle size may refer to the particle size calculated by D 90 , D 50 The particle size distribution is expressed as the particle size distribution of the particle size to be measured. The particle size distribution is well known to those skilled in the art as an indicator of the proportion of particles of what size (particle diameter) are included in the particle group to be measured. 90 and D 50 (particle diameters corresponding to 90% and 50% of the cumulative volume of the particle size distribution) represents the average particle diameter.

[0065] The metal magnetic particles may be two or more different types of metal magnetic particles. In this case, different types of metal magnetic particles mean that the metal magnetic particles are distinguished from each other in at least one of average particle size, composition, composition ratio, crystallinity and shape.

[0066] The insulating material may include at least one of epoxy resin, polyimide, liquid crystal polymer, etc. However, the present embodiment is not limited thereto.

[0067] The first coil 200 and the second coil 300 may be disposed inside the body 100 and exhibit characteristics of the coil electronic component 1000. For example, in the case where the coil electronic component 1000 of the present embodiment is used as a power inductor, when current is applied to the first coil 200 and the second coil 300, the first coil 200 and the second coil 300 store energy in the form of a magnetic field and maintain an output voltage, thereby stabilizing the power of the electronic device.

[0068] The first coil 200 and the second coil 300 may be magnetically coupled and form a coupled inductor structure.

[0069] The first coil 200 and the second coil 300 may be in the form of a spirally wound metal (e.g., copper (Cu) or silver (Ag)) wire with an insulating material coated on the surface. That is, the first coil 200 and the second coil 300 may be wound coils. The first coil 200 and the second coil 300 are not limited to a single wire, but may include a twisted wire or two or more wires.

[0070] The first coil 200 and the second coil 300 may each be a circular coil. However, the present embodiment is not limited thereto. For example, the first coil 200 and the second coil 300 may each be various well-known coils, such as a rectangular coil, an oval or elliptical coil, and the like.

[0071] The cross-section of a single conductive wire of each of the first coil 200 and the second coil 300 may have various well-known shapes such as a rectangular shape, a circular shape, and an elliptical shape.

[0072] In the case where the cross section of a single wire of the first coil 200 has an approximately rectangular shape, the single wire of the first coil 200 may have a first coil surface 201, a second coil surface 202, a third coil surface 203, and a fourth coil surface 204. The first coil surface 201 and the second coil surface 202 are opposite to each other in the thickness direction (T-axis direction). The third coil surface 203 and the fourth coil surface 204 connect the first coil surface 201 and the second coil surface 202, and are opposite to each other in the length direction (L-axis direction).

[0073] In the case where the cross section of a single wire of the second coil 300 has an approximately rectangular shape, the single wire of the second coil 300 may have a first coil surface 301, a second coil surface 302, a third coil surface 303, and a fourth coil surface 304. The first coil surface 301 and the second coil surface 302 are opposite to each other in the thickness direction (T-axis direction). The third coil surface 303 and the fourth coil surface 304 connect the first coil surface 301 and the second coil surface 302, and are opposite to each other in the length direction (L-axis direction).

[0074] The first coil 200 and the second coil 300 may each include a plurality of layers. The first coil 200 may include a lower coil 200A and an upper coil 200B. The upper coil 200B may be connected to the lower coil 200A. The upper coil 200B may be arranged above the lower coil 200A, that is, relatively closer to the fifth surface S5 of the body 100, and include one or more layers. The second coil 300 may include a lower coil 300A and an upper coil 300B. The upper coil 300B may be connected to the lower coil 300A. The upper coil 300B may be arranged above the lower coil 300A, that is, relatively closer to the fifth surface S5 of the body 100, and include one or more layers.

[0075] The first coil 200 and the second coil 300 may each have a plurality of turns.

[0076] For example, the first coil 200 may sequentially have an outermost turn coil C1 , at least one middle turn coil C2 , and an innermost turn coil C3 in a direction from the outer surface of the body 100 toward the inside of the body 100 .

[0077] Likewise, the second coil 300 may sequentially have an outermost turn coil C1 ′, at least one middle turn coil C2 ′, and an innermost turn coil C3 ′ in a direction from the outer surface of the body 100 toward the inside of the body 100 .

[0078] The insulating film IF may be disposed along the surface of each of the multiple turns of each of the first coil 200 and the second coil 300. The insulating film IF may be used to protect the multiple turns of the first coil 200 and the second coil 300 and to insulate the multiple turns of the first coil 200 and the second coil 300, and includes a well-known insulating material such as polyparaxylene. Any material may be used as the insulating material included in the insulating film 1F, and the insulating material is not particularly limited. For example, the insulating film IF may include a polyurethane resin, a polyester resin, an epoxy resin, or a polyamide-imide resin. The insulating film IF may be formed by a method such as vapor deposition. However, the present embodiment is not limited thereto.

[0079] The first coil 200 may include a winding portion 210 and a lead-out portion 220 .

[0080] The winding portion 210 is a portion of the metal conductive wire including at least one turn.

[0081] The lead-out portion 220 extends from opposite ends of the winding portion 210, respectively, and is exposed from the sixth surface S6 of the body 100. The lead-out portion 220 includes a first lead-out portion 223 and a second lead-out portion 225. The first lead-out portion 223 extends from one end of the winding portion 210 and is exposed from the sixth surface S6 of the body 100, and the second lead-out portion 225 extends from the other end of the winding portion 210 and is exposed from the sixth surface S6 of the body 100.

[0082] In addition, portions of the first and second lead-out portions 223 and 225 exposed from the sixth surface S6 of the body 100 may be spaced apart from each other in the length direction (L-axis direction). However, the present embodiment is not limited thereto.

[0083] The second coil 300 may include a winding portion 310 and a lead-out portion 320 .

[0084] The winding portion 310 is a portion of the metal conductive wire including at least one turn.

[0085] The lead-out portion 320 extends from opposite ends of the winding portion 310, respectively, and is exposed from the sixth surface S6 of the body 100. The lead-out portion 320 includes a first lead-out portion 323 and a second lead-out portion 325. The first lead-out portion 323 extends from one end of the winding portion 310 and is exposed from the sixth surface S6 of the body 100, and the second lead-out portion 325 extends from the other end of the winding portion 310 and is exposed from the sixth surface S6 of the body 100. The first lead-out portion 323 and the second lead-out portion 325 of the lead-out portion 320 may be the third lead-out portion and the fourth lead-out portion of the second coil 300, respectively.

[0086] In addition, portions of the first and second lead-out portions 323 and 325 exposed from the sixth surface S6 of the body 100 may be spaced apart from each other in the length direction (L-axis direction). However, the present embodiment is not limited thereto.

[0087] If the length of the coil electronic component is constant, the larger the width of the core of the body, the larger the area of ​​the magnetic circuit, which can increase the inductance. In addition, the smaller the size of the edge portion of the body in the length direction (L-axis direction), the larger the inductance can be. That is, if the size of the edge portion is reduced, the coil can be arranged farther away from the center of the body to that extent, so that the width of the core can be increased and the inductance can be increased.

[0088] To increase inductance by increasing the width of the core of the coil electronic component and reducing the size of the edge portion, in this embodiment, a ratio of thickness to width of a cross section of each of the first coil 200 and the second coil 300 , ie, an aspect ratio, may be adjusted.

[0089] An aspect ratio of a cross section of the first coil 200 may be 1.25:1 or more and 5:1 or less, and an aspect ratio of a cross section of the second coil 300 may be 1.25:1 or more and 5:1 or less.

[0090] If the aspect ratio is less than 1.25:1, the width of the core is too large and the inductance may be reduced. That is, the coupling coefficient of the first coil 200 and the second coil 300 may have a negative value. If the aspect ratio is greater than 5:1, the width of the core is too small and the inductance may be reduced. That is, the coupling coefficient of the first coil 200 and the second coil 300 may have a negative value.

[0091] The aspect ratio of the cross-section of the first coil 200 is calculated based on the thickness and width of the cross-section of the first coil 200, and the aspect ratio of the cross-section of the second coil 300 is calculated based on the thickness and width of the cross-section of the second coil 300, and the thickness and width of the cross-section of the first coil 200 and the thickness and width of the cross-section of the second coil 300 are measured based on an optical microscope or scanning electron microscope (SEM) photograph of a cross-section (hereinafter, referred to as "LT cross-section"), and the LT cross-section is intercepted at the central part of the coil electronic component 1000 in the width direction (W-axis direction) along the length direction (L-axis direction) and the thickness direction (T-axis direction) perpendicular to the width direction (W-axis direction).

[0092] For example, the thickness of the cross section of the first coil 200 (or the second coil 300) may refer to the maximum value among the lengths of a plurality of line segments connecting opposite ends of the cross section in the thickness direction in the above LT cross section photograph. The width of the cross section of the first coil 200 (or the second coil 300) may refer to the maximum value among the lengths of a plurality of line segments connecting opposite ends of the cross section in the width direction in the above LT cross section photograph.

[0093] As another example, the thickness of the cross section of the first coil 200 (or the second coil 300) may refer to the arithmetic mean between the maximum and minimum values ​​of the lengths of a plurality of line segments connecting opposite ends of the cross section in the thickness direction in the above-mentioned LT cross-sectional photograph. The width of the cross section of the first coil 200 (or the second coil 300) may refer to the arithmetic mean between the maximum and minimum values ​​of the lengths of a plurality of line segments connecting opposite ends of the cross section in the width direction in the above-mentioned LT cross-sectional photograph. However, if the cross section has a protruding area or a convex area in the thickness direction, the width may be measured from the remaining area other than the area.

[0094] Based on the thickness and width of the cross section of the first coil 200 (or the second coil 300) measured as above, the aspect ratio of the first coil 200 (or the second coil 300) can be calculated. For example, the aspect ratio of the first coil 200 (or the second coil 300) can be the arithmetic mean of the aspect ratios of the cross sections measured based on the above LT cross-sectional photograph.

[0095] The body 100 may include a first magnetic body 110 , a second magnetic body 120 , and a third magnetic body 130 .

[0096] The first magnetic body 110 surrounds and encloses the first coil 200 and includes a magnetic material. The first magnetic body 110 may include magnetic particles and an insulating material interposed between the magnetic particles.

[0097] The first magnetic body 110 includes a base 111, a protrusion 113, a support 115, and a recess 117, and forms a part of the appearance of the body 100. In other words, the first magnetic body 110 includes a recess defined by the base 111, the protrusion 113, and the support 115, and the first coil 200 is disposed in the recess. The first magnetic body 110 may form a part of the first surface S1, a part of the second surface S2, a part of the third surface S3, a part of the fourth surface S4, and a sixth surface S6 of the body 100. In addition, the first magnetic body 110 may be an integrated structure. That is, the base 111, the protrusion 113, and the support 115 of the first magnetic body 110 may be formed integrally. For example, the first magnetic body 110 may be formed by filling a mold with a magnetic material. The first magnetic body 110 may be formed by filling a mold with a composite material including a magnetic material and an insulating resin.

[0098] In some embodiments, Figure 6 As shown, the cross-section of the first magnetic body 110 taken in the length direction (L-axis direction) and the thickness direction (T-axis direction) may have the shape or appearance of the letter E. That is, the protrusion 113 is provided at the center of the base 111, and the support portions 115 are respectively provided at two opposite edges of the base 111 and spaced apart from the protrusion 113. The height H1 of the protrusion 113 and the height H2 of the support portion 115 may be the same.

[0099] The height of the protrusion 113 and the height of the support portion 115 are measured based on an optical microscope or scanning electron microscope (SEM) photograph of a cross section (taken in the length direction (L axis direction) and the thickness direction (T axis direction)) at the central portion of the coil electronic component 1000 in the width direction (W axis direction). The height of the protrusion 113 and the height of the support portion 115 may be the arithmetic mean of the height of the protrusion 113 and the height of the support portion 115 at five equally spaced points on the protrusion 113 and the support portion 115 of the coil electronic component 1000 shown in the above cross-sectional photograph.

[0100] In some embodiments, Figure 7 As shown, the protrusion 113 and the support portion 115' may have different heights. For example, the height H2' of the support portion 115' may be less than the height H1 of the protrusion 113. However, since the support portion 115' protrudes from the surface of the base 111, the height H2' of the support portion 115' is greater than 0.

[0101] The base 111 forms a part of the appearance of the first magnetic body 110 , and the protrusion 113 and the support 115 are provided on a surface of the base 111 .

[0102] For example, the base 111 may include a front surface 111A and a rear surface 111B opposite to each other in the width direction (W-axis direction) and a bottom surface 111C and an upper surface 111D opposite to each other in the thickness direction (T-axis direction). The bottom surface 111C of the base 111 may form the sixth surface S6 of the body 100.

[0103] The protrusion 113 is a portion protruding from the upper surface 111D of the base 111. For example, the protrusion 113 may protrude from the center of the base 111 in the thickness direction (T-axis direction). The first coil 200 is wound around the protrusion 113. The shape of the protrusion 113 as viewed in the thickness direction (T-axis direction) is not particularly limited, and may be a circular shape, an elliptical shape, a polygonal shape (such as a triangular shape and a quadrilateral shape), etc. The protrusion 113 may have various known shapes that can be accommodated in the hollow space of the first coil 200. For example, in a cross section taken along the length direction (L-axis direction) and the width direction (W-axis direction), the shape of the protrusion may be the same as the shape of the hollow space of the first coil.

[0104] The support portion 115 is a portion protruding from the upper surface 111D of the base 111. Since the support portion 115 protrudes from the edge of the base 111 in the thickness direction (T-axis direction), the support portion 115 is spaced apart from the protruding portion 113.

[0105] There may be a plurality of support portions 115 .

[0106] The support portion 115 may include a first support portion 115A, a second support portion 115B, a third support portion 115C, and a fourth support portion 115D. The first support portion 115A and the second support portion 115B face each other in the length direction (L-axis direction), and the third support portion 115C and the fourth support portion 115D face each other in the width direction (W-axis direction).

[0107] The first support portion 115A, the second support portion 115B, the third support portion 115C, and the fourth support portion 115D may not be connected to each other. That is, between adjacent support portions among the first support portion 115A, the second support portion 115B, the third support portion 115C, and the fourth support portion 115D, there may be a first groove 117A, a second groove 117B, a third groove 117C, or a fourth groove 117D as described below. Through the first groove 117A, the second groove 117B, the third groove 117C, and the fourth groove 117D, the lead-out portions 223 and 225 of the first coil 200 may be led out and connected to the external electrodes 500 and 600, and the lead-out portions 323 and 325 of the second coil 300 may be led out and connected to the external electrodes 700 and 800.

[0108] The recess 117 is an area between the protrusion 113 and the support 115. The first coil 200 may be disposed in the recess 117 and wound around the protrusion 113. That is, by arranging the protrusion 113 to penetrate the hollow space of the first coil 200, the first coil 200 may be accommodated in the recess 117 of the first magnetic body 110. The size of the recess 117 may fully accommodate the first coil 200. However, during the process of pressing the second magnetic body 120 and the third magnetic body 130 onto the first magnetic body 110, as the protrusion 113 and the support 115 of the first magnetic body 110 extend laterally under pressure, the recess 117 may subsequently shrink. As the recess 117 shrinks, the first coil 200 may be in close contact with the protrusion 113 and the support 115. In addition, in this process, the third magnetic body 130 may extend between the first coil 200 and the protrusion 113 under pressure, and may extend between the first coil 200 and the support 115. That is, a portion of the third magnetic body 130 may exist between the first coil 200 and the protrusion 113, and a portion of the third magnetic body 130 may exist between the first coil 200 and the support 115. In other words, at least a portion of the third magnetic body 130 may be in contact with the first coil 200, the protrusion 113, and the support 115.

[0109] On the other hand, in the case where the support portion 115 is not provided in the first magnetic body 110 and only the protrusion 113 is provided, that is, in the case where the cross section of the first magnetic body 110 taken in the length direction (L-axis direction) and the thickness direction (T-axis direction) is in the shape of the letter T, in the process of pressing the second magnetic body 120 and the third magnetic body 130 onto the first magnetic body 110, the area around the protrusion 113 of the first magnetic body 110 is filled with the second magnetic body 120 and the third magnetic body 130. However, since the support portion 115 is not provided in the first magnetic body 110, the second magnetic body 120 and the third magnetic body 130 may flow (or penetrate) into the area around the protrusion 113 without receiving the opposite pressure (or resistance) from the support portion 115, so that the second coil 300 moves with the movement of the second magnetic body 120 and the third magnetic body 130, resulting in the misalignment of the second coil 300.

[0110] In contrast, according to the present embodiment, since the first magnetic body 110 including the protrusion 113 and the support portion 115 is in the shape of the letter E, the second magnetic body 120 and the third magnetic body 130 can flow (penetrate) into the recess 117 of the first magnetic body 110 under the opposite pressure (or resistance) from the support portion 115, so that the movement of the second coil 300 is relatively restricted, thereby reducing misalignment.

[0111] The base 111 may have a first groove 117A, a second groove 117B, a third groove 117C, and a fourth groove 117D.

[0112] The first groove 117A and the second groove 117B may be respectively arranged at two opposite sides in the length direction (L-axis direction) across the front surface 111A and the bottom surface 111C of the base 111. The first groove 117A and the second groove 117B do not extend to the rear surface 111B of the base 111. The first groove 117A and the second groove 117B may guide the first lead-out portion 223 and the second lead-out portion 225 of the first coil 200. For example, the first lead-out portion 223 may extend along the first groove 117A and be connected to the first external electrode 500, and the second lead-out portion 225 may extend along the second groove 117B and be connected to the second external electrode 600. However, the present embodiment is not limited thereto. The first lead-out portion and the second lead-out portion may extend in various directions.

[0113] The first groove 117A and the second groove 117B may respectively have a depth and a width that can accommodate the first lead-out portion 223 and the second lead-out portion 225. For example, the depth of each of the first groove 117A and the second groove 117B may be the same as or less than the thickness of each of the first lead-out portion 223 and the second lead-out portion 225. The width of each of the first groove 117A and the second groove 117B may be the same as or greater than the width of each of the first lead-out portion 223 and the second lead-out portion 225.

[0114] The third groove 117C and the fourth groove 117D may be respectively arranged at two opposite sides in the length direction (L-axis direction) across the rear surface 111B and the bottom surface 111C of the base 111. The third groove 117C and the fourth groove 117D do not extend to the front surface 111A of the base 111. The third groove 117C and the fourth groove 117D may guide the first lead-out portion 323 and the second lead-out portion 325 of the second coil 300. For example, the first lead-out portion 323 may extend along the third groove 117C and be connected to the third external electrode 700, and the second lead-out portion 325 may extend along the fourth groove 117D and be connected to the fourth external electrode 800. However, the present embodiment is not limited thereto. The first lead-out portion and the second lead-out portion may extend in various directions.

[0115] The third groove 117C and the fourth groove 117D may respectively have a depth and a width that can accommodate the first lead-out portion 323 and the second lead-out portion 325. For example, the depth of each of the third groove 117C and the fourth groove 117D may be the same as or less than the thickness of each of the first lead-out portion 323 and the second lead-out portion 325, and the width of each of the third groove 117C and the fourth groove 117D may be the same as or greater than the width of each of the first lead-out portion 323 and the second lead-out portion 325.

[0116] As another example, refer to Figure 8 , the first groove 117A' may have a shape in which a portion of the front surface 111A of the base 111 is recessed toward the rear surface 111B. In this case, the side surface 1151 of the first support portion 115A may be coplanar with the exposed surface 119A of the base 111, and the side surface 1152 of the fourth support portion 115D may be coplanar with the exposed surface 119B of the base 111. The second groove 117B', the third groove 117C', and the fourth groove 117D' may also have the same shape as the first groove 117A'.

[0117] However, the base may not necessarily have the groove, and may not have the groove depending on how the base is formed or how the lead-out portion is arranged.

[0118] The second magnetic body 120 includes a second core 123. The second core 123 may be a portion of the second magnetic body 120 filled in at least a portion of the hollow space of the second coil 300.

[0119] The second magnetic body 120 surrounds at least a portion of the second coil 300 and forms a portion of the appearance of the body 100. That is, the second magnetic body 120 may form a portion of the first surface S1, a portion of the second surface S2, a portion of the third surface S3, a portion of the fourth surface S4, and a fifth surface S5 of the body 100.

[0120] There is no particular limitation on the method of forming the second magnetic body 120. For example, the second magnetic body 120 may be formed by placing a sheet made of a magnetic material on an upper portion of the second coil 300, pressing the sheet, and solidifying it.

[0121] As described above, the second core 123 may be a portion formed by filling the hollow space of the second coil 300 during a process of forming the second magnetic body 120 by pressing a sheet made of a magnetic material onto the second coil 300. On the other hand, since the first magnetic body 110 has an integrated structure, the protrusion 113 of the first magnetic body 110 protrudes from the base 111 and penetrates the hollow space of the first coil 200.

[0122] The third magnetic body 130 is disposed between the first magnetic body 110 and the second magnetic body 120. For example, the third magnetic body 130 may contact the first magnetic body 110 and the second magnetic body 120, respectively.

[0123] The third magnetic body 130 may include a first surface 131 and a second surface 133 that are opposite in the thickness direction (T-axis direction). The first surface 131 of the third magnetic body 130 may contact the protrusion 113 and the support portion 115 of the first magnetic body 110. In addition, the first surface 131 of the third magnetic body 130 may contact a portion of the first coil 200. That is, the third magnetic body 130 may contact the first coil 200, the protrusion 113 and the support portion 115 of the first magnetic body 110.

[0124] In addition, the third magnetic body 130 may contact a portion of the second magnetic body 120 and a portion of the second coil 300. That is, the second surface 133 of the third magnetic body 130 may contact a surface of the second magnetic body 120 opposite to the first magnetic body 110, and the second surface 133 of the third magnetic body 130 may contact the second coil surface 302 of the second coil 300.

[0125] When viewed in the thickness direction (T-axis direction), the third magnetic body 130 may have a rectangular shape. However, the present embodiment is not limited thereto. For example, the third magnetic body 130 may have a shape similar to the winding portion 210 of the first coil 200 or the winding portion 310 of the second coil 300.

[0126] The third magnetic body 130 may extend to the edge of the first magnetic body 110. That is, the outer surface of the third magnetic body 130 and the outer surface of the first magnetic body 110 may form a portion of the outer surface of the body 100 (eg, the first surface S1 or the second surface S2).

[0127] In addition, the third magnetic body 130 may not extend to the edge of the first magnetic body 110. In this case, the third magnetic body 130 does not form an outer surface of the body 100. In other words, the edge of the third magnetic body 130 contacts the first magnetic body 110.

[0128] The third magnetic body 130 may include a magnetic material to affect magnetic coupling characteristics of the first coil 200 and the second coil 300. The third magnetic body 130 may include magnetic particles and an insulating material interposed between the magnetic particles.

[0129] The magnetic permeability of the third magnetic body 130 may be less than the magnetic permeability of the first magnetic body 110 and less than the magnetic permeability of the second magnetic body 120. In this case, the third magnetic body 130 may be made of a material different from the materials of the first magnetic body 110 and the second magnetic body 120. The composition of the material of the magnetic body may be inferred from a scanning electron microscope (SEM) photograph of the coil electronic component. In addition, the magnetic permeability of the first magnetic body 110, the magnetic permeability of the second magnetic body 120, and the magnetic permeability of the third magnetic body 130 may be appropriately set to adjust the coupling coefficient (k) of the first coil 200 and the second coil 300.

[0130] For example, as a method of adjusting the magnetic permeabilities of the first magnetic body 110 (or the second magnetic body 120) and the third magnetic body 130, the volume fraction of the first magnetic particles included in the first magnetic body 110 (or the second magnetic body 120) and the volume fraction of the second magnetic particles included in the third magnetic body 130 may be made different. In this case, the volume fraction of the magnetic particles refers to the ratio of the volume of the first magnetic particles to the volume of the first magnetic body 110 (or the second magnetic body 120) or the ratio of the volume of the second magnetic particles to the volume of the third magnetic body 130. In order to adjust the relative magnetic permeabilities of the first magnetic body 110 (or the second magnetic body 120) and the third magnetic body 130 respectively by the volume fraction of the first magnetic particles and the volume fraction of the second magnetic particles, the first magnetic particles and the second magnetic particles may be made of the same material, for example, a metal alloy of the same composition. In addition, as a method of adjusting the magnetic permeability of the first magnetic body 110 (or the second magnetic body 120) and the third magnetic body 130, the area fraction of the first magnetic particles included in the first magnetic body 110 (or the second magnetic body 120) may be made different (confirmed by the cross-sectional area) from the area fraction of the second magnetic particles included in the third magnetic body 130. In this case, the area fraction of the magnetic particles refers to the ratio of the cross-sectional area of ​​the first magnetic particles to the cross-sectional area of ​​the first magnetic body 110 (or the second magnetic body 120) or the ratio of the cross-sectional area of ​​the second magnetic particles to the cross-sectional area of ​​the third magnetic body 130.

[0131] The case where the magnetic permeability of the third magnetic body 130 is less than that of the first magnetic body 110 (or the second magnetic body 120) may be a case where the volume fraction of the second magnetic particles included in the third magnetic body 130 is less than the volume fraction of the first magnetic particles included in the first magnetic body 110 (or the second magnetic body 120). If the magnetic permeability of the third magnetic body 130 is less than that of the first magnetic body 110 (or the second magnetic body 120), the coupling coefficient of the first coil 200 and the second coil 300 may be relatively increased. In this case, the relatively increased coupling coefficient means that the coupling coefficient is greater than the case where the magnetic permeability of the third magnetic body 130 and the magnetic permeability of the first magnetic body 110 (or the second magnetic body 120) are the same. In the case where the magnetic permeability of the third magnetic body 130 is relatively small, the magnetic flux flowing in the third magnetic body 130 is relatively small, and the mutual inductance due to the magnetic flux shared by the first coil 200 and the second coil 300 increases. In this case, the magnetic flux flowing in the third magnetic body 130 may be understood as flowing through the third magnetic body 130 in the length direction (L-axis direction), such as Figure 4 shown.

[0132] As a result, the mutual inductance of the first coil 200 and the second coil 300 increases, and the leakage inductance generated only in the first coil 200 or the second coil 300 decreases, so the coupling coefficient of the first coil 200 and the second coil 300 increases.

[0133] The first and second external electrodes 500 and 600 are disposed outside the body 100 and are electrically connected to the first coil 200 .

[0134] The first external electrode 500 is disposed on the sixth surface S6 of the body 100 , and the first lead-out portion 223 of the first coil 200 is exposed from the sixth surface S6 of the body 100 and connected to the first external electrode 500 .

[0135] The second external electrode 600 is disposed on the sixth surface S6 of the body 100 , and the second lead-out portion 225 of the first coil 200 is exposed from the sixth surface S6 of the body 100 and connected to the second external electrode 600 .

[0136] The first external electrode 500 and the second external electrode 600 may each be made of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Cr), titanium (Ti), or an alloy thereof. However, the present embodiment is not limited thereto.

[0137] The first external electrode 500 and the second external electrode 600 may each include a plurality of metal layers formed by plating a conductive metal.

[0138] Reference Figure 1 As shown in the left circle in FIG. , the first external electrode 500 may include a first metal layer 501 , a second metal layer 502 and a third metal layer 503 .

[0139] The first metal layer 501 may be a plating layer in contact with the first lead-out portion 223 of the first coil 200 and the outer surface of the body 100, and may include copper (Cu). The second metal layer 502 may be a plating layer covering the first metal layer 501, and may include nickel (Ni). The third metal layer 503 may be a plating layer covering the second metal layer 502, and may include tin (Sn). However, the present embodiment is not limited to a three-layer structure, and may have a double-layer structure (only one plating layer is added to the first metal layer 501).

[0140] Reference Figure 1 As shown in the right circle in FIG. , the second external electrode 600 may include a first metal layer 601 , a second metal layer 602 and a third metal layer 603 .

[0141] The first metal layer 601 may be a plating layer in contact with the second lead-out portion 225 of the first coil 200 and the outer surface of the body 100, and may include copper (Cu). The second metal layer 602 may be a plating layer covering the first metal layer 601, and may include nickel (Ni). The third metal layer 603 may be a plating layer covering the second metal layer 602, and may include tin (Sn). However, the present embodiment is not limited to a three-layer structure, and may have a double-layer structure (only one plating layer is added to the first metal layer 601).

[0142] As described above, the first external electrode 500 and the second external electrode 600 may each include nickel (Ni), copper (Cu), palladium (Pd), gold (Au), or an alloy thereof, and may include a plurality of plating layers. For example, the first external electrode 500 and the second external electrode 600 may each be made of a combination of a nickel (Ni) layer, a copper (Cu) layer, a nickel / copper (Ni / Cu) layer, a palladium / nickel (Pd / Ni) layer, a palladium / nickel / copper (Pd / Ni / Cu) layer, and a copper / nickel / copper (Cu / Ni / Cu) layer.

[0143] In some embodiments, the outermost layer may include tin (Sn). Since the tin plating layer has a relatively low melting point, the ease of mounting the first and second external electrodes 500 and 600 on the substrate may be improved.

[0144] Typically, the tin plated layer may be connected to an electrode pad on a substrate through a solder containing a tin (Sn)-copper (Cu)-silver (Ag) alloy paste. That is, the tin plated layer may be melted and bonded to the solder during a heat treatment (reflow) process.

[0145] As another example, the first external electrode 500 and the second external electrode 600 may each include a plurality of electrode layers. For example, the first external electrode 500 and the second external electrode 600 may each include a first electrode layer, a second electrode layer covering the first electrode layer, and a third electrode layer covering the second electrode layer. The first electrode layer may include copper (Cu) and may be a conductive resin layer. The conductive resin layer may include a conductive metal for ensuring conductivity and a resin for absorbing impact. The resin is not particularly limited as long as it has adhesive properties and impact absorbing properties and can be mixed with conductive metal powder to form a paste, and may include, for example, phenolic resin, acrylic resin, silicone resin, epoxy resin, or polyimide resin. For example, the conductive metal may include at least one of copper (Cu), tin (Sn), nickel (Ni), silver (Ag), palladium (Pd), gold (Au), platinum (Pt), tungsten (W), and titanium (Ti).

[0146] The third and fourth external electrodes 700 and 800 are disposed outside the body 100 and are electrically connected to the second coil 300 .

[0147] The third external electrode 700 is disposed on the sixth surface S6 of the body 100 , and the first lead-out portion 323 of the second coil 300 is exposed from the sixth surface S6 of the body 100 and connected to the third external electrode 700 .

[0148] The fourth external electrode 800 is disposed on the sixth surface S6 of the body 100 , and the second lead-out portion 325 of the second coil 300 is exposed from the sixth surface S6 of the body 100 and connected to the fourth external electrode 800 .

[0149] Since the structures and components of the third and fourth external electrodes 700 and 800 are the same as those of the first and second external electrodes 500 and 600 , a repeated description thereof will be omitted.

[0150] In addition, the insulating layer 900 may be provided on the body 100 of the coil electronic component 1000 according to the present embodiment (except for the region where the first external electrode 500, the second external electrode 600, the third external electrode 700, and the fourth external electrode 800 are provided). Optionally, on the sixth surface S6 of the body 100, the insulating layer may exist between the exposed portion of the first lead-out portion 223 of the first coil 200, the exposed portion of the second lead-out portion 225 of the first coil 200, the exposed portion of the first lead-out portion 323 of the second coil 300, and the exposed portion of the second lead-out portion 325 of the second coil 300. In this case, the first external electrode 500, the second external electrode 600, the third external electrode 700, and the fourth external electrode 800 may cover a portion of the insulating layer, respectively.

[0151] As described above, the insulating layer 900 may be disposed on at least a portion of the first surface S1, at least a portion of the second surface S2, at least a portion of the third surface S3, at least a portion of the fourth surface S4, at least a portion of the fifth surface S5, and a portion of the sixth surface S6 of the body 100, and prevent electrical short circuits between other electronic components and the external electrodes 500, 600, 700, and 800.

[0152] The insulating layer 900 may be used as a plating resist when the external electrodes 500 , 600 , 700 , and 800 are formed by electroplating. However, the present embodiment is not limited thereto.

[0153] In addition, the shapes of the external electrodes 500 , 600 , 700 , and 800 according to the present embodiment are not limited to the above-mentioned shapes, but may be various shapes.

[0154] For example, the first external electrode 500 may be connected to the first lead-out portion 223 of the first coil 200 on the sixth surface S6 of the body 100 and extend to the first surface S1 of the body 100. In addition, the second external electrode 600 may be connected to the second lead-out portion 225 of the first coil 200 on the sixth surface S6 of the body 100 and extend to the second surface S2 of the body 100. The third external electrode 700 may be connected to the first lead-out portion 323 of the second coil 300 on the sixth surface S6 of the body 100 and extend to the first surface S1 of the body 100. In addition, the fourth external electrode 800 may be connected to the second lead-out portion 325 of the second coil 300 on the sixth surface S6 of the body 100 and extend to the second surface S2 of the body 100.

[0155] As yet another example, the first external electrode 500 may be connected to the first lead-out portion 223 of the first coil 200 on the sixth surface S6 of the body 100, and extend to the first surface S1 and the fifth surface S5 of the body 100. In addition, the second external electrode 600 may be connected to the second lead-out portion 225 of the first coil 200 on the sixth surface S6 of the body 100, and extend to the second surface S2 and the fifth surface S5 of the body 100. The third external electrode 700 may be connected to the first lead-out portion 323 of the second coil 300 on the sixth surface S6 of the body 100, and extend to the first surface S1 and the fifth surface S5 of the body 100. In addition, the fourth external electrode 800 may be connected to the second lead-out portion 325 of the second coil 300 on the sixth surface S6 of the body 100, and extend to the second surface S2 and the fifth surface S5 of the body 100.

[0156] Fig. 9 Schematically shows a coil electronic component according to another embodiment Figure 4 The corresponding cross-sectional view.

[0157] Reference Fig. 9 The coil electronic component 2000 may include a body 1100 , a first coil 200 , a second coil 300 , a first external electrode 500 , a second external electrode 600 , a third external electrode 700 , and a fourth external electrode 800 .

[0158] The body 1100 may include a first magnetic body 1110 , a second magnetic body 1120 , and a third magnetic body 1130 .

[0159] The first magnetic body 1110 surrounds and encloses the first coil 200 and includes a magnetic material. The first magnetic body 1110 may include a base 111, a protrusion 113, and a support 115, and a cross section taken in a length direction (L-axis direction) and a thickness direction (T-axis direction) may have a letter E shape.

[0160] The second magnetic body 1120 surrounds and encloses the second coil 300 and includes a magnetic material. The second magnetic body 1120 may include a base 1111, a protrusion 1113, and a support 1115, and a cross section taken in a length direction (L-axis direction) and a thickness direction (T-axis direction) may have a letter E shape. That is, the protrusion 1113 is provided at the center of the base 1111, and the support 1115 is respectively provided at two opposite edges of the base 1111 and spaced apart from the protrusion 1113. The second magnetic body 1120 has the same or corresponding shape as the first magnetic body 1110, and therefore a redundant description thereof will be omitted.

[0161] The third magnetic body 1130 is disposed between the first magnetic body 1110 and the second magnetic body 1120 .

[0162] The third magnetic body 1130 may contact the first coil 200 and the protrusion 113 and the support 115 of the first magnetic body 1110. A portion of the third magnetic body 1130 may exist between the first coil 200 and the protrusion 113, and a portion of the third magnetic body 1130 may exist between the first coil 200 and the support 115.

[0163] In addition, the third magnetic body 1130 may contact the second coil 300 and the protrusion 1113 and the support 1115 of the second magnetic body 1120. A portion of the third magnetic body 1130 may exist between the second coil 300 and the protrusion 1113, and a portion of the third magnetic body 1130 may exist between the second coil 300 and the support 1115.

[0164] In addition to the above, the remaining components are Figure 1 The components of the coil electronic assembly shown in are the same, so a redundant description thereof will be omitted.

[0165] Hereinafter, specific examples of the present disclosure will be described. However, the examples described below are only intended to specifically illustrate and explain the present disclosure, and the scope of the present disclosure should not be limited thereto.

[0166] [Preparation Example: Manufacture of Coil Electronic Components] (Example 1) A coil electronic component in which the thickness of each of the first coil and the second coil was 200 μm, the width of each of the first coil and the second coil was 40 μm, and the aspect ratio was 5.00:1 was manufactured.

[0167] (Example 2) Example 2 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 198 μm, the width of each of the first coil and the second coil is 41 μm, and the aspect ratio is about 4.83:1.

[0168] (Example 3) Example 3 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 195 μm, the width of each of the first coil and the second coil is 41 μm, and the aspect ratio is about 4.76:1.

[0169] (Example 4) Example 4 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 193 μm, the width of each of the first coil and the second coil is 42 μm, and the aspect ratio is about 4.60:1.

[0170] (Example 5) Example 5 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 190 μm, the width of each of the first coil and the second coil is 42 μm, and the aspect ratio is about 4.52:1.

[0171] (Example 6) Example 6 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 188 μm, the width of each of the first coil and the second coil is 43 μm, and the aspect ratio is about 4.37:1.

[0172] (Example 7) Example 7 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 185 μm, the width of each of the first coil and the second coil is 43 μm, and the aspect ratio is about 4.30:1.

[0173] (Example 8) Example 8 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 183 μm, the width of each of the first coil and the second coil is 44 μm, and the aspect ratio is about 4.16:1.

[0174] (Example 9) Example 9 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 180 μm, the width of each of the first coil and the second coil is 44 μm, and the aspect ratio is about 4.09:1.

[0175] (Example 10) Example 10 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 178 μm, the width of each of the first coil and the second coil is 45 μm, and the aspect ratio is about 3.96:1.

[0176] (Example 11) Example 11 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 175 μm, the width of each of the first coil and the second coil is 46 μm, and the aspect ratio is about 3.80:1.

[0177] (Example 12) Example 12 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 150 μm, the width of each of the first coil and the second coil is 53 μm, and the aspect ratio is about 2.83:1.

[0178] (Example 13) Example 13 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 125 μm, the width of each of the first coil and the second coil is 64 μm, and the aspect ratio is about 1.95:1.

[0179] (Example 14) Example 14 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 123 μm, the width of each of the first coil and the second coil is 65 μm, and the aspect ratio is about 1.89:1.

[0180] (Example 15) Example 15 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 120 μm, the width of each of the first coil and the second coil is 67 μm, and the aspect ratio is about 1.79:1.

[0181] (Example 16) Example 16 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 118 μm, the width of each of the first coil and the second coil is 68 μm, and the aspect ratio is about 1.74:1.

[0182] (Example 17) Example 17 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 115 μm, the width of each of the first coil and the second coil is 70 μm, and the aspect ratio is about 1.64:1.

[0183] (Example 18) Example 18 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 113 μm, the width of each of the first coil and the second coil is 71 μm, and the aspect ratio is about 1.59:1.

[0184] (Example 19) Example 19 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 110 μm, the width of each of the first coil and the second coil is 73 μm, and the aspect ratio is about 1.51:1.

[0185] (Example 20) Example 20 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 108 μm, the width of each of the first coil and the second coil is 74 μm, and the aspect ratio is about 1.46:1.

[0186] (Example 21) Example 21 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 105 μm, the width of each of the first coil and the second coil is 76 μm, and the aspect ratio is about 1.38:1.

[0187] (Example 22) Example 22 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronics component is 103 μm, the width of each of the first coil and the second coil is 78 μm, and the aspect ratio is about 1.32:1.

[0188] (Example 23) Example 23 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronic component is 100 μm, the width of each of the first coil and the second coil is 80 μm, and the aspect ratio is 1.25:1.

[0189] (Comparative Example 1) Comparative Example 1 is the same as Example 1, except that the thickness of each of the first coil and the second coil of the coil electronic component is 300 μm, the width of each of the first coil and the second coil is 27 μm, and the aspect ratio is about 11.11:1.

[0190] (Comparative Example 2) Comparative Example 2 is the same as Comparative Example 1, except that the thickness of each of the first coil and the second coil of the coil electronic component is 275 μm, the width of each of the first coil and the second coil is 29 μm, and the aspect ratio is about 9.48:1.

[0191] (Comparative Example 3) Comparative Example 3 is the same as Comparative Example 1, except that the thickness of each of the first coil and the second coil of the coil electronic component is 250 μm, the width of each of the first coil and the second coil is 32 μm, and the aspect ratio is about 7.81:1.

[0192] (Comparative Example 4) Comparative Example 4 is the same as Comparative Example 1, except that the thickness of each of the first coil and the second coil of the coil electronic component is 225 μm, the width of each of the first coil and the second coil is 36 μm, and the aspect ratio is 6.25:1.

[0193] (Comparative Example 5) Comparative Example 5 is the same as Comparative Example 1, except that the thickness of each of the first coil and the second coil of the coil electronic component is 75 μm, the width of each of the first coil and the second coil is 107 μm, and the aspect ratio is about 0.70:1.

[0194] (Comparative Example 6) Comparative Example 6 is the same as Comparative Example 1, except that the thickness of each of the first coil and the second coil of the coil electronic component is 50 μm, the width of each of the first coil and the second coil is 160 μm, and the aspect ratio is about 0.31:1.

[0195] [Experimental example: Is the inductance of the coil electronic component poor?] After manufacturing 29 coil electronic components of Examples 1 to 23 and Comparative Examples 1 to 6, cross-sectional samples were prepared by grinding the surfaces in the length direction (L-axis direction) and the thickness direction (T-axis direction) to a depth of about 1 / 2 in the width direction (W-axis direction).

[0196] For the prepared cross-sectional samples, the aspect ratio (t:w) was calculated by measuring the width (w) and thickness (t) of the coil, the diameter (d) of the core was measured, the coupling coefficient (k) of the coil electronic components was checked to see if it was within the allowable range (greater than 0.1 and less than 0.9), and the results are summarized in Table 1, where the width (w), thickness (t), t:w, diameter (d), and coupling coefficient (k) are all rounded results.

[0197] [Table 1] Referring to Table 1, it can be confirmed that the coupling coefficients of the coil electronic components manufactured according to Comparative Examples 1 to 6 are negative and therefore outside the allowable range (greater than 0.1 and less than 0.9). In Comparative Examples 1 to 4, the core diameter is relatively small, so the magnetic path area is also small, and as a result, the coupling coefficient is negative. In Comparative Examples 5 and 6, the core diameter is relatively very large, but the aspect ratio of the coil is very small, 0.70:1 and 0.31:1, respectively, and as a result, the coupling coefficient is negative.

[0198] In addition, it can be confirmed that the coupling coefficients of the coil electronic components manufactured according to Examples 1 to 23 are within the allowable range (greater than 0.1 and less than 0.9).

[0199] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited thereto, and various modifications may be made and performed within the scope of the claims, the detailed description of the present disclosure, and the drawings, and these modifications also fall within the scope of the present disclosure.

Claims

1. A coil electronic assembly, comprising: A body, comprising a first magnetic body and a second magnetic body facing the first magnetic body; a first coil, at least a portion of which is embedded in the first magnetic body; as well as a second coil, at least a portion of which is embedded in the second magnetic body, Wherein, the first magnetic body is an integrated structure having a recess, and Wherein, the first coil is arranged in the recess.

2. The coil electronic component according to claim 1, wherein: The first magnetic body includes a base, a protrusion protruding from the base, and a support portion spaced apart from the protrusion and protruding from the base. The recess is defined by the base, the protrusion and the support, and The first coil is wound around the protrusion.

3. The coil electronic assembly according to claim 2, wherein: The body further includes a third magnetic body located between the first magnetic body and the second magnetic body.

4. The coil electronic assembly according to claim 3, wherein: An outer surface of the third magnetic body and an outer surface of the first magnetic body form a portion of an outer surface of the body.

5. The coil electronic assembly according to claim 4, wherein: The third magnetic body at least partially contacts the second coil and the second magnetic body.

6. The coil electronics assembly according to claim 5, wherein: The height of the protrusion is different from the height of the support portion.

7. The coil electronics assembly according to claim 3, wherein: The third magnetic body at least partially contacts the first coil, the protrusion, and the support portion.

8. The coil electronics assembly according to claim 7, wherein: The first coil is surrounded by the base, the protrusion, the support, and the third magnetic body.

9. The coil electronics assembly according to claim 7, wherein: The third magnetic body includes a portion located between the first coil and the protrusion.

10. The coil electronics assembly according to claim 7, wherein: The third magnetic body includes a portion located between the first coil and the support portion.

11. The coil electronics assembly according to claim 1, wherein: The aspect ratio of the first coil is 1.25:1 or greater and 5:1 or less, and The aspect ratio of the second coil is 1.25:1 or greater and 5:1 or less, The aspect ratio is defined as the ratio of the thickness to the width of the cross section of the first coil or the second coil.

12. The coil electronics assembly of claim 1, wherein: A coupling coefficient between the first coil and the second coil is 0.17 or more and 0.33 or less.

13. The coil electronics assembly according to claim 1, further comprising: a first external electrode disposed outside the main body and connected to a first lead-out portion of the first coil; a second external electrode disposed outside the main body and connected to a second lead-out portion of the first coil; a third external electrode disposed outside the main body and connected to the first lead-out portion of the second coil; as well as A fourth external electrode is disposed outside the main body and connected to the second lead-out portion of the second coil.

14. The coil electronics assembly according to claim 1, further comprising: An insulating film is located on a surface of the first coil and a surface of the second coil.

15. The coil electronics assembly of claim 3, wherein: The third magnetic body has a magnetic permeability different from magnetic permeabilities of the first and second magnetic bodies.

16. The coil electronics assembly of claim 15, wherein: The third magnetic body includes a material different from materials of the first and second magnetic bodies.

17. The coil electronics assembly of claim 3, wherein: Each of the first magnetic body, the second magnetic body, and the third magnetic body includes metal magnetic particles made of a soft magnetic alloy.

18. The coil electronic component according to claim 2, wherein: The second magnetic body includes a second base, a second protrusion protruding from the second base, and a second support portion spaced apart from the second protrusion and protruding from the second base, and wherein the second coil is wound around the second protrusion. 19 . The coil electronic component of claim 18 , further comprising a third magnetic body in contact with the first coil, the protrusion, the support portion, the second coil, the second protrusion, and the second support portion.

20. The coil electronics assembly according to claim 19, wherein: A portion of the third magnetic body is disposed between the second coil and the second protrusion.

21. The coil electronics assembly according to claim 19, wherein: A portion of the third magnetic body is disposed between the second coil and the second support portion.

22. A coil electronic assembly comprising: A first coil having a first lead-out portion and a second lead-out portion; a second coil having a third lead portion and a fourth lead portion, the second coil being magnetically coupled to the first coil; a first magnetic body including an integrated structure including a base, a protrusion protruding from a central region of an upper surface of the base, and a support protruding from a peripheral region of the upper surface of the base and spaced apart from the protrusion; The first external electrode, the second external electrode, the third external electrode and the fourth external electrode are disposed on the bottom surface of the base, wherein the first coil is wound around the protrusion, wherein the base comprises a first groove and a second groove respectively arranged at opposite sides in the length direction across a front surface of the base, and a third groove and a fourth groove respectively arranged at opposite sides in the length direction across a rear surface of the base opposite to the front surface, and Among them, the first lead portion, the second lead portion, the third lead portion and the fourth lead portion are respectively connected to the first external electrode, the second external electrode, the third external electrode and the fourth external electrode via the first groove, the second groove, the third groove and the fourth groove respectively.

23. The coil electronics assembly according to claim 22, further comprising a second magnetic body, wherein: At least a portion of the second coil is embedded in the second magnetic body, and wherein the first magnetic body and the second magnetic body form a body of the coil electronics assembly.

24. The coil electronics assembly according to claim 22, wherein: The aspect ratio of the first coil is in the range of 1.25:1 to 5:1, wherein the aspect ratio is defined as a ratio of a thickness to a width of a cross section of the first coil.

25. The coil electronic component according to claim 23, further comprising a third magnetic body disposed between the first magnetic body and the second magnetic body, wherein: The third magnetic body includes a magnetic material different from magnetic materials of the first and second magnetic bodies.

26. The coil electronics assembly according to claim 25, wherein: The first coil is surrounded by the base, the protrusion, the support, and the third magnetic body, and the third magnetic body is at least partially in contact with the second coil and the second magnetic body.

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