Coil electronic component

Abstract

The present disclosure provides a coil electronic component, which may include: a magnetic body having a first surface and a second surface opposite to each other; a first coil embedded in the magnetic body and wound around the first core; a second coil embedded in the magnetic body and wound around a second core spaced apart from the first core; a first electrode pad and a second electrode pad disposed on the second surface of the magnetic body and connected to the first coil; and a third electrode pad and a fourth electrode pad disposed on the second surface of the magnetic body and connected to the second coil, and a first distance from the first coil and the second coil to the first surface is greater than a second distance from the first coil and the second coil to the second surface.

Description

Technical Field

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

[0002] In recent years, as the functions of mobile devices have diversified, power consumption has increased. Therefore, in order to extend the battery life in mobile devices, coil electronic components with low loss and high efficiency have been adopted around power management integrated circuits (PMICs).

[0003] When a coil electronic component has a coupled inductor structure in which a first coil and a second coil are arranged vertically, even if the length of the first coil and the length of the second coil are the same, a direct current (DC) resistance (Rdc) may increase as the length of an external electrode coupled to the first coil and the second coil increases. Therefore, a method for reducing the DC resistance of a coil in a coupled inductor structure is needed. Summary of the invention

[0004] An aspect of an embodiment provides a coil electronic component capable of reducing a DC resistance of a coil in a coupled inductor structure.

[0005] However, the objects achieved by the embodiments are not limited to the above objects, and various extensions can be made without departing from the technical spirit and scope of the embodiments.

[0006] According to an embodiment, a coil electronic component may include: a magnetic body having a first surface and a second surface opposite to each other, and including a first core and a second core spaced apart from the first core; a first coil embedded in the magnetic body and wound around the first core; a second coil embedded in the magnetic body and wound around the second core; a first electrode pad and a second electrode pad, which are arranged on the second surface of the magnetic body and connected to the first coil; and a third electrode pad and a fourth electrode pad, which are arranged on the second surface of the magnetic body and connected to the second coil, and a first distance from the first coil and the second coil to the first surface is greater than a second distance from the first coil and the second coil to the second surface.

[0007] Furthermore, a difference between the first distance and the second distance may be in the range of 5µm to 160µm.

[0008] In addition, the coil electronic component may also include a supporting member, the supporting member having a first supporting surface and a second supporting surface, the first supporting surface facing the first surface of the magnetic body, the second supporting surface facing the second surface of the magnetic body, and the first coil may include a first coil pattern, a second coil pattern and a first via, the first coil pattern is arranged on the first supporting surface of the supporting member, the second coil pattern is arranged on the second supporting surface of the supporting member, the first via passes through the supporting member and connects the first coil pattern and the second coil pattern, and the second coil may include a third coil pattern, a fourth coil pattern and a second via, the third coil pattern is arranged on the first supporting surface of the supporting member, the fourth coil pattern is arranged on the second supporting surface of the supporting member, the second via passes through the supporting member and connects the third coil pattern and the fourth coil pattern.

[0009] In addition, the first coil pattern may include a first winding pattern wound around the first core and a first extension pattern wound around the first core and the second core, the second coil pattern may include a second winding pattern wound around the first core and a second extension pattern wound around the first core and the second core, the third coil pattern may include a third winding pattern wound around the second core and a third extension pattern wound around the first core and the second core, and the fourth coil pattern may include a fourth winding pattern wound around the second core and a fourth extension pattern wound around the first core and the second core.

[0010] In addition, a winding direction of the first winding pattern and a winding direction of the second winding pattern may be opposite to each other, and a winding direction of the third winding pattern and a winding direction of the fourth winding pattern may be opposite to each other.

[0011] Furthermore, the winding direction of the first winding pattern and the winding direction of the third winding pattern may be identical to each other, and the winding direction of the second winding pattern and the winding direction of the fourth winding pattern may be identical to each other.

[0012] Furthermore, the winding direction of the first winding pattern and the winding direction of the first extending pattern may be identical to each other, and the winding direction of the second winding pattern and the winding direction of the second extending pattern may be identical to each other.

[0013] Furthermore, the winding direction of the third winding pattern and the winding direction of the third extension pattern may be identical to each other, and the winding direction of the fourth winding pattern and the winding direction of the fourth extension pattern may be identical to each other.

[0014] In addition, the first coil pattern may include a first winding pattern wound around the first core and a first extension pattern wound around the first core and the second core, the second coil pattern may include a second winding pattern wound around the first core and a second extension pattern extending from the second winding pattern toward the second core, the third coil pattern may include a third winding pattern wound around the second core and a third extension pattern wound around the first core and the second core, and the fourth coil pattern may include a fourth winding pattern wound around the second core and a fourth extension pattern extending from the fourth winding pattern toward the first core.

[0015] In addition, a winding direction of the first winding pattern and a winding direction of the second winding pattern may be opposite to each other, and a winding direction of the third winding pattern and a winding direction of the fourth winding pattern may be opposite to each other.

[0016] Furthermore, the winding direction of the first winding pattern and the winding direction of the third winding pattern may be identical to each other, and the winding direction of the second winding pattern and the winding direction of the fourth winding pattern may be identical to each other.

[0017] Furthermore, the winding direction of the first winding pattern and the winding direction of the first extension pattern may be identical to each other, and the winding direction of the third winding pattern and the winding direction of the third extension pattern may be identical to each other.

[0018] In addition, the first coil pattern may include a first winding pattern wound around the first core and a first extension pattern extending from the first winding pattern toward the second core, the second coil pattern may be wound around the first core and the second core, the third coil pattern may include a third winding pattern wound around the second core and a third extension pattern extending from the third winding pattern toward the first core, and the fourth coil pattern may be wound around the first core and the second core.

[0019] In addition, a winding direction of the first winding pattern and a winding direction of the second winding pattern may be opposite to each other, and a winding direction of the third winding pattern and a winding direction of the fourth winding pattern may be opposite to each other.

[0020] Furthermore, the winding direction of the first winding pattern and the winding direction of the third winding pattern may be identical to each other, and the winding direction of the second winding pattern and the winding direction of the fourth winding pattern may be identical to each other.

[0021] In addition, the coil electronic component may also include: a first connecting electrode, embedded in the magnetic body and connecting the first electrode pad to the first coil; a second connecting electrode, embedded in the magnetic body and connecting the second electrode pad to the first coil; a third connecting electrode, embedded in the magnetic body and connecting the third electrode pad to the second coil; and a fourth connecting electrode, embedded in the magnetic body and connecting the fourth electrode pad to the second coil.

[0022] In addition, the coil electronic component may also include: a first dummy pad, embedded in the magnetic body and separated from the first coil, and the first connecting electrode passes through the first dummy pad; and a second dummy pad, embedded in the magnetic body and separated from the second coil, and the third connecting electrode passes through the second dummy pad.

[0023] In addition, the magnetic body may also have a third surface and a fourth surface opposite to each other and connecting the first surface and the second surface, the first coil may include a first lead-out portion and a second lead-out portion, the first lead-out portion extends from the third surface and is connected to the first electrode pad, the second lead-out portion extends from the fourth surface and is connected to the second electrode pad, and the second coil may include a third lead-out portion and a fourth lead-out portion, the third lead-out portion extends from the fourth surface and is connected to the third electrode pad, and the fourth lead-out portion extends from the third surface and is connected to the fourth electrode pad.

[0024] In addition, the magnetic body may also have a third surface and a fourth surface opposite to each other and connecting the first surface and the second surface, the first coil may include a first lead-out portion and a second lead-out portion, the first lead-out portion extends from the third surface and is connected to the first electrode pad, the second lead-out portion extends from the third surface and is connected to the second electrode pad, and the second coil may include a third lead-out portion and a fourth lead-out portion, the third lead-out portion extends from the fourth surface and is connected to the third electrode pad, and the fourth lead-out portion extends from the fourth surface and is connected to the fourth electrode pad.

[0025] The magnetic body may also have: a first covering layer located between the first surface and the first coil and between the first surface and the second coil; and a second covering layer located between the second surface and the first coil and between the second surface and the second coil, and the first covering layer may be thicker than the second covering layer.

[0026] A difference between a thickness of the first cover layer and a thickness of the second cover layer may be in a range of 5 μm to 160 μm.

[0027] The first electrode pad, the second electrode pad, the third electrode pad, and the fourth electrode pad may not be disposed on the first surface.

[0028] In the coil electronic component according to the embodiment, the DC resistance of the coil in the coupled inductor structure can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a view schematically showing a coil electronic component according to an embodiment.

[0030] Figure 2 It is schematically shown Figure 1 A top view of the coil electronics assembly.

[0031] Figure 3 It is schematically shown Figure 1 A view of a first coil pattern and a third coil pattern is shown.

[0032] Figure 4 It is schematically shown Figure 1 A view of the second coil pattern and the fourth coil pattern is shown.

[0033] Figure 5 It is along Figure 1 Schematic cross-sectional view taken along line V-V' in FIG.

[0034] Figure 6 is a view schematically showing a coil electronic component according to another embodiment.

[0035] Figure 7 It is schematically shown Figure 6 A view of a first coil pattern and a third coil pattern is shown.

[0036] Figure 8 It is schematically shown Figure 6 A view of the second coil pattern and the fourth coil pattern is shown.

[0037] Fig. 9 is a cross-sectional view schematically showing a coil electronic component according to another embodiment.

[0038] Fig.10 It is schematically shown Fig. 9 A view of a first coil pattern and a third coil pattern is shown.

[0039] Fig.11 It is schematically shown Fig. 9 A view of the second coil pattern and the fourth coil pattern is shown.

[0040] Fig.12is a view schematically showing a coil electronic component according to another embodiment.

[0041] Fig.13 It is schematically shown Fig.12 A view of some of the components of the coil electronics assembly.

[0042] Fig.14 is a view schematically showing a coil electronic component according to another embodiment.

[0043] Fig.15 It is schematically shown Fig.14 A view of some of the components of the coil electronics assembly. DETAILED DESCRIPTION

[0044] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments of the present disclosure. The accompanying drawings and descriptions are considered to be illustrative rather than restrictive in nature. Throughout the specification, the same reference numerals represent the same elements. In addition, some of the constituent elements in the drawings may be exaggerated, omitted or schematically shown, and the size of each constituent element does not fully reflect the actual size.

[0045] The accompanying drawings are provided to help easily understand the embodiments disclosed in this specification, and the technical spirit disclosed in this specification is not limited by the accompanying drawings, and it should be understood that the present disclosure includes all modifications, equivalents, and alternatives included in the spirit and technical scope of the present disclosure.

[0046] In order to describe various constituent elements, terms including ordinal numbers such as first and second are used, but the constituent elements are not limited by these terms. These terms are used only to distinguish one constituent element from another constituent element.

[0047] Furthermore, it should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, the element can be directly on the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements. Furthermore, when an element is "on" a reference portion, the element is above or below the reference portion, and does not necessarily mean that the element is "above" or "on" in a direction opposite to gravity.

[0048] Throughout the specification, it should be understood that the terms "include" and "have" are intended to specify the presence of the features, quantities, steps, operations, constituent elements, components, or combinations thereof described in the specification, and do not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, constituent elements, components, or combinations thereof. Therefore, unless explicitly described to the contrary, the word "include" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of the stated elements without excluding any other elements.

[0049] Furthermore, throughout the specification, when “on a plane” is mentioned, it means a case where a target portion is viewed from above, and when “on a cross section” is mentioned, it means a case where a cross section obtained by vertically cutting the target portion is viewed from the side.

[0050] Furthermore, throughout the specification, when “connected” is mentioned, this not only means that two or more constituent elements are directly connected, but also means that two or more constituent elements are indirectly connected through another constituent element, or means a physical connection or an electrical connection, or means that although two or more constituent elements are called different names according to positions and functions, they are integrated.

[0051] Figure 1 is a 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. Figure 3 It is schematically shown Figure 1 A view of the first coil pattern and the third coil pattern shown, Figure 4 It is schematically shown Figure 1 A view of the second coil pattern and the fourth coil pattern shown, and Figure 5 It is along Figure 1 Schematic cross-sectional view taken along line V-V' in FIG.

[0052] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the coil electronic component 1000 according to the embodiment includes a magnetic body 100 , a first coil 200 , a second coil 300 , a support member 400 , a first external electrode 500 , a second external electrode 600 , a third external electrode 700 , and a fourth external electrode 800 .

[0053] The magnetic body 100 may have a substantially rectangular parallelepiped shape, but the present embodiment is not limited thereto. Due to the shrinkage of the magnetic powder during sintering, the magnetic body 100 may have a substantially rectangular parallelepiped shape, although not a perfect rectangular parallelepiped shape. For example, the magnetic body 100 may have a substantially rectangular parallelepiped shape, for example, may have rounded edges or vertices.

[0054] In this embodiment, for the sake of convenience of explanation, the two surfaces of the magnetic body opposite to each other in the length direction (L-axis direction) are respectively defined as the first surface S1 and the second surface S2, the two surfaces of the magnetic body opposite to each other in the width direction (W-axis direction) are respectively defined as the third surface S3 and the fourth surface S4, and the two surfaces of the magnetic body opposite to each other in the thickness direction (T-axis direction) are respectively defined as the fifth surface S5 and the sixth surface S6.

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

[0056] The thickness of the coil electronic component 1000 may refer to the maximum value among the lengths of a plurality of line segments, each of which connects the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the thickness direction (T-axis direction) shown in an optical microscope photograph or SEM (scanning electron microscope) photograph of a cross section in the length direction (L-axis direction) and the thickness direction (T-axis direction) at a region where an external electrode is provided in the width direction (W-axis direction) of the coil electronic component 1000, and is parallel to the thickness direction (T-axis direction). Optionally, the thickness of the coil electronic component 1000 may refer to the minimum value among the lengths of a plurality of line segments, each of which connects the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the thickness direction (T-axis direction) shown in the above-mentioned cross-sectional photograph, and is parallel to the thickness direction (T-axis direction). Alternatively, the thickness of the coil electronic component 1000 may refer to the arithmetic mean of the lengths of at least two of a plurality of line segments, each of the plurality of line segments connecting two outermost boundary lines of the coil electronic component 1000 opposite to each other in the thickness direction (T-axis direction) shown in the above-mentioned cross-sectional photograph, and being parallel to the thickness direction (T-axis direction).

[0057] The width of the coil electronic component 1000 may refer to the maximum value among the lengths of a plurality of line segments, each of which connects the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the width direction (W axis direction) shown in an optical microscope photograph or SEM (scanning electron microscope) photograph of a length direction (L axis direction) and width direction (W axis direction) cross section at the center in the thickness direction (T axis direction) of the coil electronic component 1000, and is parallel to the width direction (W axis direction). Optionally, the width of the coil electronic component 1000 may refer to the minimum value among the lengths of a plurality of line segments, each of which connects the two outermost boundary lines of the coil electronic component 1000 opposite to each other in the width direction (W axis direction) shown in the above cross-sectional photograph, and is parallel to the width direction (W axis direction). Alternatively, the width of the coil electronic component 1000 may refer to the arithmetic mean of the lengths of at least two of a plurality of line segments, each of the plurality of line segments connecting two outermost boundary lines of the coil electronic component 1000 shown in the above-mentioned cross-sectional photograph, which are opposite to each other in the width direction (W-axis direction), and are parallel to the width direction (W-axis direction).

[0058] In addition, each of the length, width, and thickness of the coil electronic component 1000 can be measured using a micrometer measurement method. In the micrometer measurement method, a micrometer with gauge repeatability and reproducibility (R&R) can be used to measure by the following steps: setting a zero point, inserting the coil electronic component 1000 according to the present embodiment between the tips of the micrometer, and rotating the measuring rod of the micrometer. In addition, in the case of measuring the length of the coil electronic component 1000 by the micrometer measurement method, the length of the coil electronic component 1000 may refer to a single measurement value, or may refer to the arithmetic mean of multiple measurement values. This can also be applied to measuring the width and thickness of the coil electronic component 1000.

[0059] The magnetic body 100 constitutes the appearance of the coil electronic component 1000 and has a space for forming a magnetic circuit when current is applied to the first coil 200 through the first external electrode 500 and the second external electrode 600 and current is applied to the second coil 300 through the third external electrode 700 and the fourth external electrode 800. The magnetic circuit is a path through which the magnetic flux induced by the first coil 200 and the magnetic flux induced by the second coil 300 pass.

[0060] The magnetic body 100 encloses the first coil 200, the second coil 300, and the supporting member 400, and includes a magnetic material. For example, the magnetic body 100 may include magnetic particles, and an insulating material may be interposed between the magnetic particles.

[0061] The magnetic material may include first metal magnetic particles, second metal magnetic particles having a larger particle size than the first metal magnetic particles, and third metal magnetic particles having a larger particle size than the second metal magnetic particles. 50 The average particle size D of the second metal magnetic particles may be in the range of 0.1µm to 0.2µm. 50 The average particle size D of the third metal magnetic particles may be in the range of 1µm to 2µm. 50 Available in the range of 25µm to 30µm.

[0062] The magnetic particles may be ferrite particles or metal magnetic particles exhibiting magnetic properties.

[0063] The ferrite particles may include, for example, at least one of spinel ferrites (such as Mg-Zn-based ferrites, Mn-Zn-based ferrites, Mn-Mg-based ferrites, Cu-Zn-based ferrites, Mg-Mn-Sr-based ferrites, and Ni-Zn-based ferrites), hexagonal ferrites (such as Ba-Zn-based ferrites, Ba-Mg-based ferrites, Ba-Ni-based ferrites, Ba-Co-based ferrites, and Ba-Ni-Co-based ferrites), garnet-type ferrites (such as Y-based ferrites), and Li-based ferrites.

[0064] The metal magnetic particles may be composed of two or more powder particles having different compositions, and may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metal magnetic particles may be at least one of pure iron, Fe-Si-based alloys, Fe-Si-Al-based alloys, Fe-Ni-based alloys, Fe-Ni-Mo-based alloys, Fe-Ni-Mo-Cu-based alloys, Fe-Co-based alloys, Fe-Ni-Co-based alloys, Fe-Cr-based alloys, Fe-Cr-Si-based alloys, Fe-Si-Cu-Nb-based alloys, Fe-Ni-Cr-based alloys, and Fe-Cr-Al-based alloys. Here, different compositions of the metal magnetic particles may also mean different contents.

[0065] The metal magnetic particles may be amorphous or crystalline. For example, the metal magnetic particles may be Fe-Si-B-Cr based amorphous alloy, but the present embodiment is not limited thereto. The average particle size of the metal magnetic particles may be in the range of about 0.1 µm to about 30 µm, but is not limited thereto. In this specification, the average particle size may be referred to as D 90 , D 50 The particle size distribution is known to those skilled in the art as an indicator of the proportion of particles of a certain size (particle diameter) contained in the particle group to be measured. 50 (Particle size corresponding to 50% of the cumulative volume of the particle size distribution) refers to the average particle size.

[0066] The metal magnetic particles may be two or more different types of metal magnetic particles. Here, different types of metal magnetic particles means that the metal magnetic particles are distinguished from each other in at least one of average particle size, composition, component ratio, crystallinity and shape.

[0067] The insulating material may include epoxy resin, polyimide, liquid crystal polymer, etc., alone or in combination, but is not limited thereto.

[0068] There is no particular limitation on the method of forming the magnetic body 100. For example, the magnetic body 100 may be formed by placing magnetic material sheets on the upper and lower portions of the first and second coils 200 and 300 and compacting and curing the magnetic material sheets.

[0069] The first coil 200 and the second coil 300 are disposed inside the magnetic body 100, and exhibit the characteristics of a coil electronic component. 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 coil electronic component can be used to stabilize the power supply of the electronic device by storing energy in the form of a magnetic field and maintaining an output voltage.

[0070] The first coil 200 and the second coil 300 are magnetically coupled to each other, thereby including a coupled inductor structure.

[0071] The supporting member 400 is disposed inside the magnetic body 100 , and supports the first coil 200 and the second coil 300 .

[0072] The support member 400 may be made of an insulating material including a thermosetting insulating resin (such as epoxy resin), a thermoplastic insulating resin (such as polyimide), or a photosensitive insulating resin, or may be made of an insulating material prepared by impregnating a reinforcing member (such as glass fiber or an inorganic filler) in the insulating resin. For example, the support member 400 may be made of an insulating material such as a prepreg, an Ajinomoto Build-up Film (ABF), FR-4, a bismaleimide triazine (BT) film, a photosensitive dielectric (PID) film, etc., but the present embodiment is not limited thereto.

[0073] The inorganic filler may include at least one selected from the group consisting of silicon dioxide (SiO2), aluminum oxide (Al2O3), silicon carbide (SiC), barium sulfate (BaSO4), talc, clay, mica powder, aluminum hydroxide (Al(OH)3), magnesium hydroxide (Mg(OH)2), calcium carbonate (CaCO3), magnesium carbonate (MgCO3), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO3), barium titanate (BaTiO3) and calcium zirconate (CaZrO3).

[0074] The support member 400 has first and second through holes 410 and 420. The first and second through holes 410 and 420 may be filled with the same magnetic material as included in the magnetic body 100 to form the first and second cores 110 and 120, thereby improving performance of the coil electronic component 1000.

[0075] The support member 400 may have a first support surface 430 and a second support surface 440 that are opposite to each other in the thickness direction (T-axis direction).

[0076] The first coil 200 may be disposed on the first support surface 430 and the second support surface 440 of the support member 400 , and the second coil 300 may be disposed on the first support surface 430 and the second support surface 440 of the support member 400 .

[0077] The first coil 200 may include a first coil pattern 210, a second coil pattern 220, and a first via 230. The first coil pattern 210 is disposed on a first supporting surface 430 of the supporting member 400 and is wound around the first core 110. The second coil pattern 220 is disposed on a second supporting surface 440 of the supporting member 400 and is wound around the first core 110. The first via 230 connects the first coil pattern 210 and the second coil pattern 220. In other words, the first coil pattern 210 and the second coil pattern 220 may be electrically connected to each other through the first via 230.

[0078] The first coil pattern 210 has a first lead-out portion 213 at one end. The first lead-out portion 213 may be exposed (or extended) from the fourth surface S4 of the magnetic body 100 and connected to the first external electrode 500. The second coil pattern 220 has a second lead-out portion 223 at one end. The second lead-out portion 223 may be exposed (or extended) from the third surface S3 of the magnetic body 100 and connected to the second external electrode 600.

[0079] In addition, when the first coil pattern 210, the first lead-out portion 213 and the first via 230 are formed on the support member 400 by plating, each of the first coil pattern 210, the first lead-out portion 213 and the first via 230 may include a seed layer (such as, no electroplating layer) and an electroplating layer. Here, the electroplating layer may have a single-layer structure or may have a multi-layer structure. The electroplating layer having a multi-layer structure may be formed as a conformal film structure in which one electroplating layer covers another electroplating layer, or may be formed as a shape in which the electroplating layer is only stacked on one surface of another electroplating layer. The seed layer of the first coil pattern 210, the seed layer of the first lead-out portion 213 and the seed layer of the first via 230 may be formed integrally so that no boundary is formed between them, but the embodiment is not limited thereto. The electroplating layer of the first coil pattern 210, the electroplating layer of the first lead-out portion 213 and the electroplating layer of the first via 230 may be formed integrally so that no boundary is formed between them, but the embodiment is not limited thereto. This may be similarly applied to the second coil pattern 220 and the second lead-out portion 223 , the third coil pattern 310 and the third lead-out portion 313 , and the fourth coil pattern 320 and the fourth lead-out portion 323 .

[0080] Each of the first coil pattern 210 , the second coil pattern 220 , and the first via 230 may be made of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or an alloy thereof, but the embodiment is not limited thereto.

[0081] The insulating film IF may be disposed between the first coil pattern 210 and the magnetic body 100 and between the second coil pattern 220 and the magnetic body 100. The insulating film IF may be disposed along the surface of the support member 400, the surface of the first coil pattern 210, and the surface of the second coil pattern 220. The insulating film IF does not exist at the position where the first coil pattern 210 is connected to the first external electrode 500 and the position where the second coil pattern 220 is connected to the second external electrode 600. The insulating film IF is used to insulate the first coil pattern 210 and the second coil pattern 220 from the magnetic body 100, and may include a known insulating material such as polyparaxylene, but is not limited thereto. The insulating film IF may be formed by a method such as vapor deposition, but is not limited thereto. For example, the insulating film IF may be formed by stacking insulating films on both surfaces of the support member 400. This may be applied to the third coil pattern 310 and the fourth coil pattern 320 in the same manner.

[0082] The second coil 300 may include a third coil pattern 310, a fourth coil pattern 320, and a second via 330. The third coil pattern 310 is disposed on the first supporting surface 430 of the support member 400 and is wound around the second core 120. The fourth coil pattern 320 is disposed on the second supporting surface 440 of the support member 400 and is wound around the second core 120. The second via 330 connects the third coil pattern 310 and the fourth coil pattern 320. In other words, the third coil pattern 310 and the fourth coil pattern 320 may be electrically connected to each other through the second via 330.

[0083] The third coil pattern 310 has a third lead-out portion 313 at one end. The third lead-out portion 313 may be exposed (or extended) from the third surface S3 of the magnetic body 100 and connected to the third external electrode 700. The fourth coil pattern 320 has a fourth lead-out portion 323 at one end. The fourth lead-out portion 323 may be exposed (or extended) from the fourth surface S4 of the magnetic body 100 and connected to the fourth external electrode 800.

[0084] Hereinafter, the shape of the first coil pattern 210 , the shape of the second coil pattern 220 , the shape of the third coil pattern 310 , and the shape of the fourth coil pattern 320 will be described in more detail.

[0085] Reference Figure 3, the first coil pattern 210 may include a first winding pattern 215 and a first extension pattern 217. The first winding pattern 215 is a portion wound at least once around the first core 110, and the first extension pattern 217 is a portion wound around the first core 110 and the second core 120. In other words, the first coil pattern 210 may include a first winding pattern 215 extending from the first via 230 and wound about 1.75 times clockwise around the first core 110, and a first extension pattern 217 extending from the first winding pattern 215 and wound about once clockwise around the first core 110 and the second core 120. However, the number of turns of the first winding pattern 215 and the number of turns of the first extension pattern 217 are not limited thereto and may be changed in various ways. The first lead-out portion 213 may be provided at one end of the first extension pattern 217.

[0086] Reference Figure 4 , the second coil pattern 220 may include a second winding pattern 225 and a second extension pattern 227. The second winding pattern 225 is a portion wound at least once around the first core 110, and the second extension pattern 227 is a portion wound around the first core 110 and the second core 120. In other words, the second coil pattern 220 may include a second winding pattern 225 extending from the first via 230 and wound about 1.75 times counterclockwise around the first core 110 and a second extension pattern 227 extending from the second winding pattern 225 and wound about once counterclockwise around the first core 110 and the second core 120. However, the number of turns of the second winding pattern 225 and the number of turns of the second extension pattern 227 are not limited thereto and may be changed in various ways. The second lead-out portion 223 may be provided at one end of the second extension pattern 227.

[0087] The cross-sections of the first coil pattern 210 and the second coil pattern 220 may have various well-known shapes, such as a rectangular shape, a circular shape, an elliptical shape, etc. Here, the cross-section refers to a cross-section parallel to the thickness direction (T-axis direction).

[0088] Still refer to Figure 3 , the third coil pattern 310 may include a third winding pattern 315 and a third extension pattern 317. The third winding pattern 315 is a portion wound around the second core 120 at least once, and the third extension pattern 317 is a portion wound around the first core 110 and the second core 120. In other words, the third coil pattern 310 may include a third winding pattern 315 extending from the second via 330 and wound about 1.75 times clockwise around the second core 120, and a third extension pattern 317 extending from the third winding pattern 315 and wound about once clockwise around the first core 110 and the second core 120. However, the number of turns of the third winding pattern 315 and the number of turns of the third extension pattern 317 are not limited thereto and may be changed in various ways. The third lead-out portion 313 may be provided at one end of the third extension pattern 317.

[0089] Still refer to Figure 4 , the fourth coil pattern 320 may include a fourth winding pattern 325 and a fourth extension pattern 327. The fourth winding pattern 325 is a portion wound at least once around the second core 120, and the fourth extension pattern 327 is a portion wound around the first core 110 and the second core 120. In other words, the fourth coil pattern 320 may include a fourth winding pattern 325 extending from the second via 330 and wound about 1.75 times counterclockwise around the second core 120, and a fourth extension pattern 327 extending from the fourth winding pattern 325 and wound about once counterclockwise around the first core 110 and the second core 120. However, the number of turns of the fourth winding pattern 325 and the number of turns of the fourth extension pattern 327 are not limited thereto and may be changed in various ways. The fourth lead-out portion 323 may be provided at one end of the fourth extension pattern 327.

[0090] The cross-sections of the third coil pattern 310 and the fourth coil pattern 320 may have various well-known shapes, such as a rectangular shape, a circular shape, an elliptical shape, etc. Here, the cross-section refers to a cross-section parallel to the thickness direction (T-axis direction).

[0091] The first and second external electrodes 500 and 600 are disposed outside the magnetic body 100 and are electrically connected to the first coil 200 .

[0092] The first external electrode 500 may include a first electrode pad 510 and a first connection portion 520 .

[0093] The first electrode pad 510 is disposed on the sixth surface S6 of the magnetic body 100, and the first connection portion 520 extends from the first electrode pad 510 to the fourth surface S4 of the magnetic body 100. The first lead-out portion 213 of the first coil 200 is exposed (or extended) from the fourth surface S4 of the magnetic body 100 and connected to the first connection portion 520. Therefore, the first coil 200 is electrically connected to the first external electrode 500. In addition, the first electrode pad 510 and the first connection portion 520 may be an integral structure.

[0094] The second external electrode 600 may include a second electrode pad 610 and a second connection portion 620 .

[0095] The second electrode pad 610 is disposed on the sixth surface S6 of the magnetic body 100, and the second connection portion 620 extends from the second electrode pad 610 to the third surface S3 of the magnetic body 100. The second lead-out portion 223 of the first coil 200 is exposed (or extended) from the third surface S3 of the magnetic body 100 and connected to the second connection portion 620. Therefore, the first coil 200 is electrically connected to the second external electrode 600. In addition, the second electrode pad 610 and the second connection portion 620 may be an integral structure.

[0096] Even if the length of the first coil 200 is constant, the length of the first connection portion 520 of the first external electrode 500 and the length of the second connection portion 620 of the second external electrode 600 may be different according to the structure of the magnetic body 100. In particular, when the length of the first connection portion 520 of the first external electrode 500 and the length of the second connection portion 620 of the second external electrode 600 increase, the DC resistance Rdc of the first coil 200 may increase.

[0097] According to the present embodiment, the structure of the magnetic body 100 may be changed so that the length of the first connection portion 520 and the length of the second connection portion 620 are reduced, thereby reducing the DC resistance Rdc of the first coil 200 .

[0098] Reference Figure 5 , the first distance D1 from the first coil 200 and the second coil 300 to the fifth surface S5 of the magnetic body 100 may be greater than the second distance D2 from the first coil 200 and the second coil 300 to the sixth surface S6 of the magnetic body 100. According to the present embodiment, compared with the case where the first distance D1 and the second distance D2 are the same, the second distance D2 is smaller, so the length of the first connection portion 520 of the first external electrode 500 and the length of the second connection portion 620 of the second external electrode 600 are reduced by the same amount as the reduction in the second distance. Therefore, the DC resistance Rdc of the first coil 200 can be reduced.

[0099] Here, the first distance D1 and the second distance D2 are measured based on a scanning electron microscope (SEM) photograph of the following cross section: a cross section (hereinafter referred to as "LT 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) and perpendicular to the width direction (W axis direction). The first distance D1 may be: in the above LT cross section photograph, the arithmetic mean of the distances from the fifth surface S5 of the magnetic body 100 to three equally spaced points on the outer surface in the thickness direction (T axis direction) of each turn in the first coil pattern 210 and the third coil pattern 310. The second distance D2 may be: in the above LT cross section photograph, the arithmetic mean of the distances from the sixth surface S6 of the magnetic body 100 to three equally spaced points on the outer surface in the thickness direction (T axis direction) of each turn in the second coil pattern 220 and the fourth coil pattern 320. Even if not described in the present disclosure, other methods and / or other tools understood by a person of ordinary skill in the art may be used.

[0100] In addition, a difference between the first distance D1 and the second distance D2 may be in the range of 5µm to 160µm.

[0101] If the difference between the first distance D1 and the second distance D2 is less than 5µm, the DC resistance reduction effect may not be significant. If the difference between the first distance D1 and the second distance D2 exceeds 160µm, the amount (i.e., degree) of inductance reduction may be greater than the amount of DC resistance reduction, and thus the overall characteristics of the coil electronic component may be degraded.

[0102] In other words, according to the present embodiment, in the magnetic body 100, the thickness T1 of the upper cover layer 130 may be greater than the thickness T2 of the lower cover layer 140. Here, the upper cover layer 130 is a region between the fifth surface S5 of the magnetic body 100 and the first coil 200 and the second coil 300, and the lower cover layer 140 is a region between the sixth surface S6 of the magnetic body 100 and the first coil 200 and the second coil 300. In the present embodiment, the thickness T1 of the upper cover layer 130 may be increased and the thickness T2 of the lower cover layer 140 may be reduced while the volume of the magnetic body 100 is constant. Therefore, the length of the first connection portion 520 of the first external electrode 500 and the length of the second connection portion 620 of the second external electrode 600 may be reduced, thereby reducing the DC resistance Rdc of the first coil 200. The difference between the thickness of the upper cover layer 130 and the thickness of the lower cover layer 140 may be in the range of 5µm to 160µm. In some embodiments, the first distance D1 and the thickness T1 may be used interchangeably, and the thickness T1 may be measured according to the measurement method for the first distance D1. In some embodiments, the second distance D2 and the thickness T2 may be used interchangeably, and the thickness T2 may be measured according to the measurement method for the second distance D2. Even if not described in the present disclosure, other methods and / or other tools understood by those of ordinary skill in the art may be used.

[0103] In addition, the first external electrode 500 and the second external electrode 600 may 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 alloys thereof, but are not limited thereto.

[0104] The first and second external electrodes 500 and 600 may include a plurality of metal layers formed by plating a conductive metal.

[0105] Reference Figure 1 As shown in the right 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 .

[0106] The first metal layer 501 may be a plating layer in contact with the first lead-out portion 213 of the first coil 200 and the outer surface of the magnetic 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 such a three-layer structure, and may be a two-layer structure in which only one plating layer is added to the first metal layer 501.

[0107] Reference Figure 1 As shown in the left 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 .

[0108] The first metal layer 601 may be a plating layer in contact with the second lead-out portion 223 of the first coil 200 and the outer surface of the magnetic 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 such a three-layer structure, and may be a two-layer structure in which only one plating layer is added to the first metal layer 601.

[0109] 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 nickel (Ni) layer or a copper (Cu) layer, or a combination of layers such as 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.

[0110] In some embodiments, the outermost layer may be made of tin (Sn). Since the tin plating layer has a relatively low melting point, the ease of substrate mounting of the first and second external electrodes 500 and 600 may be improved.

[0111] Typically, the tin plated layer can be bonded to the electrode pad on the substrate through a solder containing a tin (Sn)-copper (Cu)-silver (Ag) alloy paste. In other words, the tin plated layer can be melted and combined with the solder in a heat treatment (reflow) process.

[0112] The third and fourth external electrodes 700 and 800 are disposed outside the magnetic body 100 and are electrically connected to the second coil 300 .

[0113] The third external electrode 700 may include a third electrode pad 710 and a third connection portion 720 .

[0114] The third electrode pad 710 is disposed on the sixth surface S6 of the magnetic body 100, and the third connection portion 720 extends from the third electrode pad 710 to the third surface S3 of the magnetic body 100. The third lead-out portion 313 of the second coil 300 is exposed (or extends) from the third surface S3 of the magnetic body 100 and is connected to the third connection portion 720. Therefore, the second coil 300 is electrically connected to the third external electrode 700. In addition, the third electrode pad 710 and the third connection portion 720 may be an integral structure.

[0115] The fourth external electrode 800 may include a fourth electrode pad 810 and a fourth connection portion 820 .

[0116] The fourth electrode pad 810 is disposed on the sixth surface S6 of the magnetic body 100, and the fourth connection portion 820 extends from the fourth electrode pad 810 to the fourth surface S4 of the magnetic body 100. The fourth lead-out portion 323 of the second coil 300 is exposed (or extended) from the fourth surface S4 of the magnetic body 100 and is connected to the fourth connection portion 820. Therefore, the second coil 300 is electrically connected to the fourth external electrode 800. In addition, the fourth electrode pad 810 and the fourth connection portion 820 may be an integral structure.

[0117] The structures and components of the third and fourth external electrodes 700 and 800 are the same as those of the above-described first and second external electrodes 500 and 600 , and thus a repeated description thereof will be omitted.

[0118] In addition, on the magnetic body 100 of the coil electronic component 1000 according to the present embodiment (except for the regions where the first external electrode 500, the second external electrode 600, the third external electrode 700, and the fourth external electrode 800 are disposed), an insulating layer 900 may be disposed. However, on the fourth surface S4 of the magnetic body 100, the insulating layer may exist between the portion where the first lead-out portion 213 of the first coil 200 is exposed and the portion where the fourth lead-out portion 323 of the second coil 300 is exposed, and on the third surface S3 of the magnetic body 100, the insulating layer may exist between the portion where the second lead-out portion 223 of the first coil 200 is exposed and the portion where the third lead-out portion 313 of the second coil 300 is exposed. In this case, the first connection portion 520 of the first external electrode 500, the second connection portion 620 of the second external electrode 600, the third connection portion 720 of the third external electrode 700, and the fourth connection portion 820 of the fourth external electrode 800 may cover a portion of the insulating layer.

[0119] As described above, the insulating layer 900 may be disposed on at least a portion of each of the first surface S1, the second surface S2, the third surface S3, the fourth surface S4, the fifth surface S5, and the sixth surface S6 of the magnetic body 100 to prevent electrical short circuits between other electronic components and the first external electrode 500, the second external electrode 600, the third external electrode 700, and the fourth external electrode 800.

[0120] When the first to fourth external electrodes 500 , 600 , 700 , and 800 are formed by electroplating, the insulating layer 900 may be used as a plating resist, but is not limited thereto.

[0121] Figure 6 is a view schematically showing a coil electronic component according to another embodiment, Figure 7 It is schematically shown Figure 6 A view of the first coil pattern and the third coil pattern shown, and Figure 8 It is schematically shown Figure 6 A view of the second coil pattern and the fourth coil pattern is shown.

[0122] Reference Figure 6 , Figure 7 and Figure 8 According to another embodiment, a coil electronic component 2000 may include a magnetic body 100 , a first coil 1200 , a second coil 1300 , a support member 400 , a first external electrode 500 , a second external electrode 600 , a third external electrode 700 , and a fourth external electrode 800 .

[0123] The first coil 1200 may be disposed on the first support surface 430 and the second support surface 440 of the support member 400 , and the second coil 1300 may be disposed on the first support surface 430 and the second support surface 440 of the support member 400 .

[0124] The first coil 1200 may include a first coil pattern 1210, a second coil pattern 1220, and a first via 1230. The first coil pattern 1210 is disposed on the first supporting surface 430 of the supporting member 400 and is wound around the first core 110. The second coil pattern 1220 is disposed on the second supporting surface 440 of the supporting member 400 and is wound around the first core 110. The first via 1230 connects the first coil pattern 1210 and the second coil pattern 1220. In other words, the first coil pattern 1210 and the second coil pattern 1220 may be electrically connected to each other through the first via 1230.

[0125] The first coil pattern 1210 has a first lead-out portion 1213 at one end. The first lead-out portion 1213 may be exposed (or extended) from the fourth surface S4 of the magnetic body 100 and connected to the first external electrode 500. The second coil pattern 1220 has a second lead-out portion 1223 at one end. The second lead-out portion 1223 may be exposed (or extended) from the fourth surface S4 of the magnetic body 100 and connected to the second external electrode 600.

[0126] The second coil 1300 may include a third coil pattern 1310, a fourth coil pattern 1320, and a second via 1330. The third coil pattern 1310 is disposed on the first supporting surface 430 of the supporting member 400 and is wound around the second core 120. The fourth coil pattern 1320 is disposed on the second supporting surface 440 of the supporting member 400 and is wound around the second core 120. The second via 1330 connects the third coil pattern 1310 and the fourth coil pattern 1320. In other words, the third coil pattern 1310 and the fourth coil pattern 1320 may be electrically connected to each other through the second via 1330.

[0127] The third coil pattern 1310 has a third lead-out portion 1313 at one end. The third lead-out portion 1313 may be exposed (or extended) from the third surface S3 of the magnetic body 100 and connected to the third external electrode 700. The fourth coil pattern 1320 has a fourth lead-out portion 1323 at one end. The fourth lead-out portion 1323 may be exposed (or extended) from the third surface S3 of the magnetic body 100 and connected to the fourth external electrode 800.

[0128] Hereinafter, the shape of the first coil pattern 1210 , the shape of the second coil pattern 1220 , the shape of the third coil pattern 1310 , and the shape of the fourth coil pattern 1320 will be described in more detail.

[0129] Reference Figure 7 , the first coil pattern 1210 may include a first winding pattern 1215 and a first extension pattern 1217. For example, the first coil pattern 1210 may include a first winding pattern 1215 extending from the first via 1230 and winding about once counterclockwise around the first core 110 and a first extension pattern 1217 extending from the first winding pattern 1215 and winding about 0.75 times counterclockwise around the first core 110 and the second core 120. However, the number of turns of the first winding pattern 1215 and the number of turns of the first extension pattern 1217 are not limited thereto and may be changed in various ways. The first lead-out portion 1213 may be provided at one end of the first extension pattern 1217.

[0130] Reference Figure 8, the second coil pattern 1220 may include a second winding pattern 1225 and a second extension pattern 1227. For example, the second coil pattern 1220 may include a second winding pattern 1225 extending from the first via 1230 and wound about 1.5 times clockwise around the first core 110, and a second extension pattern 1227 extending from the second winding pattern 1225 toward the second core 120. However, the number of turns of the second winding pattern 1225 and the number of turns of the second extension pattern 1227 are not limited thereto and may be changed in various ways. The second lead-out portion 1223 may be provided at one end of the second extension pattern 1227.

[0131] Still refer to Figure 7 , the third coil pattern 1310 may include a third winding pattern 1315 and a third extension pattern 1317. The third coil pattern 1310 may include a third winding pattern 1315 extending from the second via 1330 and winding about once counterclockwise around the second core 120, and a third extension pattern 1317 extending from the third winding pattern 1315 and winding about 0.75 times counterclockwise around the first core 110 and the second core 120. However, the number of turns of the third winding pattern 1315 and the number of turns of the third extension pattern 1317 are not limited thereto and may be changed in various ways. The third lead-out portion 1313 may be provided at one end of the third extension pattern 1317.

[0132] Still refer to Figure 8 , the fourth coil pattern 1320 may include a fourth winding pattern 1325 and a fourth extension pattern 1327. The fourth coil pattern 1320 may include a fourth winding pattern 1325 extending from the second via 1330 and winding about 1.5 times clockwise around the second core 120, and a fourth extension pattern 1327 extending from the fourth winding pattern 1325 toward the first core 110. However, the number of turns of the fourth winding pattern 1325 and the number of turns of the fourth extension pattern 1327 are not limited thereto and may be changed in various ways. The fourth lead-out portion 1323 may be provided at one end of the fourth extension pattern 1327.

[0133] In addition to the above components, the components Figure 1 The constituent elements in the coil electronic components shown are the same, so their repeated description will be omitted.

[0134] Fig. 9 is a cross-sectional view schematically showing a coil electronic component of another embodiment, Fig.10 It is schematically shown Fig. 9 A view of the first coil pattern and the third coil pattern shown, Fig.11 It is schematically shown Fig. 9 A view of the second coil pattern and the fourth coil pattern is shown.

[0135] Reference Fig. 9 , Fig.10 and Fig.11 , a coil electronic component 3000 according to another embodiment includes a magnetic body 100 , a first coil 2200 , a second coil 2300 , a support member 400 , a first external electrode 500 , a second external electrode 600 , a third external electrode 700 , and a fourth external electrode 800 .

[0136] The first coil 2200 may be disposed on the first support surface 430 and the second support surface 440 of the support member 400 , and the second coil 2300 may be disposed on the first support surface 430 and the second support surface 440 of the support member 400 .

[0137] The first coil 2200 may include a first coil pattern 2210, a second coil pattern 2220, and a first via 2230. The first coil pattern 2210 is disposed on the first supporting surface 430 of the supporting member 400 and is wound around the first core 110. The second coil pattern 2220 is disposed on the second supporting surface 440 of the supporting member 400 and is wound around the first core 110 and the second core 120. The first via 2230 connects the first coil pattern 2210 and the second coil pattern 2220. In other words, the first coil pattern 2210 and the second coil pattern 2220 may be electrically connected to each other through the first via 2230.

[0138] The first coil pattern 2210 has a first lead-out portion 2213 at one end. The first lead-out portion 2213 may be exposed (or extended) from the fourth surface S4 of the magnetic body 100 and connected to the first external electrode 500. The second coil pattern 2220 has a second lead-out portion 2223 at one end. The second lead-out portion 2223 may be exposed (or extended) from the fourth surface S4 of the magnetic body 100 and connected to the second external electrode 600.

[0139] The second coil 2300 may include a third coil pattern 2310, a fourth coil pattern 2320, and a second via 2330. The third coil pattern 2310 is disposed on the first supporting surface 430 of the supporting member 400 and is wound around the second core 120. The fourth coil pattern 2320 is disposed on the second supporting surface 440 of the supporting member 400 and is wound around the first core 110 and the second core 120. The second via 2330 connects the third coil pattern 2310 and the fourth coil pattern 2320. In other words, the third coil pattern 2310 and the fourth coil pattern 2320 may be electrically connected to each other through the second via 2330.

[0140] The third coil pattern 2310 has a third lead-out portion 2313 at one end. The third lead-out portion 2313 may be exposed (or extended) from the third surface S3 of the magnetic body 100 and connected to the third external electrode 700. The fourth coil pattern 2320 has a fourth lead-out portion 2323 at one end. The fourth lead-out portion 2323 may be exposed (or extended) from the third surface S3 of the magnetic body 100 and connected to the fourth external electrode 800.

[0141] Hereinafter, the shape of the first coil pattern 2210 , the shape of the second coil pattern 2220 , the shape of the third coil pattern 2310 , and the shape of the fourth coil pattern 2320 will be described in more detail.

[0142] Reference Fig.10 , the first coil pattern 2210 may include a first winding pattern 2215 and a first extension pattern 2217. The first coil pattern 2210 may include a first winding pattern 2215 extending from the first via 2230 and winding about 1.25 times counterclockwise around the first core 110, and a first extension pattern 2217 extending from the first winding pattern 2215 toward the second core 120. However, the number of turns of the first winding pattern 2215 and the number of turns of the first extension pattern 2217 are not limited thereto and may be changed in various ways. The first lead-out portion 2213 may be provided at one end of the first extension pattern 2217.

[0143] Reference Fig.11 , the second coil pattern 2220 may extend from the first via 2230 and may be wound clockwise about 0.75 times around the first core 110 and the second core 120. However, the number of turns of the second coil pattern 2220 is not limited thereto and may be changed in various ways. The second lead-out portion 2223 may be provided at one end of the second coil pattern 2220.

[0144] Still refer to Fig.10 , the third coil pattern 2310 may include a third winding pattern 2315 and a third extension pattern 2317. The third coil pattern 2310 may include a third winding pattern 2315 extending from the second via 2330 and winding about 1.25 times counterclockwise around the second core 120, and a third extension pattern 2317 extending from the third winding pattern 2315 toward the first core 110. However, the number of turns of the third winding pattern 2315 and the number of turns of the third extension pattern 2317 are not limited thereto and may be changed in various ways. The third lead-out portion 2313 may be provided at one end of the third extension pattern 2317.

[0145] Still refer to Fig.11, the fourth coil pattern 2320 may extend from the second via 2330 and may be wound clockwise about 0.75 times around the first core 110 and the second core 120. However, the number of turns of the fourth coil pattern 2320 is not limited thereto and may be changed in various ways. The fourth lead-out portion 2323 may be provided at one end of the fourth coil pattern 2320.

[0146] In addition to the above components, the components Figure 1 The constituent elements in the coil electronic components shown are the same, so their repeated description will be omitted.

[0147] Fig.12 is a view schematically showing a coil electronic component according to another embodiment, and Fig.13 It is schematically shown Fig.12 A view of some of the components of the coil electronics assembly.

[0148] Reference Fig.12 and Fig.13 , a coil electronic component 4000 according to another embodiment includes a magnetic body 100, a first coil 3200, a second coil 3300, a support member 400, a first external electrode 3500, a second external electrode 3600, a third external electrode 3700, and a fourth external electrode 3800. Among the constituent elements of the coil electronic component 4000 according to the present embodiment, the constituent elements other than the structure in which the first external electrode 3500 and the second external electrode 3600 are connected to the first coil 3200 and the structure in which the third external electrode 3700 and the fourth external electrode 3800 are connected to the second coil 3300 are the same as Figure 6 The constituent elements of the coil electronic components shown are the same, so their repeated description will be omitted.

[0149] The first external electrode 3500 may include a first electrode pad 3510 and a first connection electrode 3520 .

[0150] The first electrode pad 3510 is disposed on the sixth surface S6 of the magnetic body 100, and in the magnetic body 100, the first connection electrode 3520 extends from the first electrode pad 3510 and is connected to the first lead-out portion 3213 of the first coil 3200. In other words, the first connection electrode 3520 is embedded in the magnetic body 100, and connects the first electrode pad 3510 to the first coil 3200. Therefore, the first coil 3200 is electrically connected to the first external electrode 3500. The first connection electrode 3520 may be made of, for example, copper (Cu), but is not limited thereto.

[0151] The second external electrode 3600 may include a second electrode pad 3610 and a second connection electrode 3620 .

[0152] The second electrode pad 3610 is disposed on the sixth surface S6 of the magnetic body 100, and in the magnetic body 100, the second connection electrode 3620 extends from the second electrode pad 3610 and is connected to the second lead-out portion 3223 of the first coil 3200. In other words, the second connection electrode 3620 is embedded in the magnetic body 100, and connects the second electrode pad 3610 to the first coil 3200. Therefore, the first coil 3200 is electrically connected to the second external electrode 3600. The second connection electrode 3620 may be made of, for example, copper (Cu), but is not limited thereto.

[0153] The third external electrode 3700 may include a third electrode pad 3710 and a third connection electrode 3720, and the third connection electrode 3720 connects the third electrode pad 3710 and the third lead-out portion 3313 of the second coil 3300 in the magnetic body 100. In other words, the third connection electrode 3720 is embedded in the magnetic body 100, and connects the third electrode pad 3710 to the second coil 3300. Therefore, the second coil 3300 is electrically connected to the third external electrode 3700. In addition, the fourth external electrode 3800 may include a fourth electrode pad 3810 and a fourth connection electrode 3820, and the fourth connection electrode 3820 connects the fourth electrode pad 3810 and the fourth lead-out portion 3323 of the second coil 3300 in the magnetic body 100. In other words, the fourth connection electrode 3820 is embedded in the magnetic body 100, and connects the fourth electrode pad 3810 to the second coil 3300. Therefore, the second coil 3300 is electrically connected to the fourth external electrode 3800. The third external electrode 3700 and the fourth external electrode 3800 may be made of, for example, copper (Cu), but are not limited thereto.

[0154] Fig.14 is a view schematically showing a coil electronic component according to another embodiment, and Fig.15 It is schematically shown Fig.14 A view of some of the components of the coil electronics assembly.

[0155] Reference Fig.14 and Fig.15 According to another embodiment, the coil electronic component 5000 includes a magnetic body 100, a first coil 4200, a second coil 4300, a support member 400, a first external electrode 4500, a second external electrode 4600, a third external electrode 4700, a fourth external electrode 4800, a first dummy pad 4530, and a second dummy pad 4730. Among the constituent elements of the coil electronic component 5000 according to this embodiment, the constituent elements other than the first dummy pad 4530 and the second dummy pad 4730 are the same as Fig.12 The constituent elements of the coil electronic components shown are the same, so their repeated description will be omitted.

[0156] The first dummy pad 4530 is disposed inside the magnetic body 100, and the first connection electrode 4520 of the first external electrode 4500 passes through the first dummy pad 4530. For example, the first dummy pad 4530 may be disposed between the first electrode pad 4510 and the first lead-out portion 4213 of the first coil 4200, and may be spaced apart from the second coil pattern 4220.

[0157] The second dummy pad 4730 is disposed inside the magnetic body 100, and the third connection electrode 4720 of the third external electrode 4700 passes through the second dummy pad 4730. For example, the second dummy pad 4730 may be disposed between the third electrode pad 4710 and the third lead-out portion 4313 of the second coil 4300, and may be spaced apart from the fourth coil pattern 4320.

[0158] In addition, the second external electrode 4600 may include a second electrode pad 4610 and a second connection electrode 4620, and the second connection electrode 4620 is connected to the second lead-out portion 4223 of the first coil 4200. The fourth external electrode 4800 may include a fourth electrode pad 4810 and a fourth connection electrode 4820, and the fourth connection electrode 4820 is connected to the fourth lead-out portion 4323 of the second coil 4300.

[0159] In addition to the above components, the components Fig.12 The constituent elements in the coil electronic components shown are the same, so their repeated description will be omitted.

[0160] Hereinafter, specific embodiments of the present disclosure will be presented. However, the following embodiments are only intended to illustrate or describe the present disclosure and should not be construed as limiting the scope of the present disclosure.

[0161] [Manufacturing example: Manufacture of coil electronic components] (Example 1) The coil electronic component was manufactured such that the thickness of the upper cover layer was 177 μm and the thickness of the lower cover layer was 172 μm.

[0162] (Example 2) The coil electronic component was manufactured such that the thickness of the upper cover layer was 179.5 μm and the thickness of the lower cover layer was 169.5 μm.

[0163] (Example 3) The coil electronic component was manufactured such that the thickness of the upper cover layer was 184.5 μm and the thickness of the lower cover layer was 164.5 μm.

[0164] (Example 4) The coil electronic component was manufactured such that the thickness of the upper cover layer was 194.5 μm and the thickness of the lower cover layer was 154.5 μm.

[0165] (Example 5) The coil electronic component was manufactured such that the thickness of the upper cover layer was 214.5 μm and the thickness of the lower cover layer was 134.5 μm.

[0166] (Example 6) The coil electronic component was manufactured such that the thickness of the upper cover layer was 234.5 μm and the thickness of the lower cover layer was 114.5 μm.

[0167] (Example 7) The coil electronic component was manufactured such that the thickness of the upper cover layer was 254.5 μm and the thickness of the lower cover layer was 94.5 μm.

[0168] (Comparative Example 1) The coil electronic component was manufactured such that the thickness of the upper cover layer was 174.5 μm and the thickness of the lower cover layer was 174.5 μm.

[0169] (Comparative Example 2) The coil electronic component was manufactured such that the thickness of the upper cover layer was 274.5 μm and the thickness of the lower cover layer was 74.5 μm.

[0170] (Comparative Example 3) The coil electronic component was manufactured such that the thickness of the upper cover layer was 294.5 μm and the thickness of the lower cover layer was 54.5 μm.

[0171] [Experimental example: Performance of coil electronic components] After manufacturing 30 coil electronic components according to each of Examples 1 to 7 and Comparative Examples 1 to 3, the thickness T1 of the upper covering layer, the thickness T2 of the lower covering layer, the inductance L1 of the first coil, the inductance L2 of the second coil, the DC resistance Rdc1 of the first coil, the DC resistance Rdc2 of the second coil, and the coupling coefficient k were measured, and the results are summarized in Tables 1 and 2.

[0172] (Table 1) (Table 2) Referring to Tables 1 and 2, in the coil electronic components manufactured according to Examples 1 to 7, the reduction rate of the inductance of the first coil is in the range of 0.01% to 5.64%, and the reduction rate of the DC resistance is in the range of 0.18% to 5.71%. In other words, when the thickness difference between the upper cover layer and the lower cover layer is in the range of 5µm to 160µm, the degree of reduction in DC resistance is greater than the degree of reduction in inductance of the first coil, thereby improving the overall characteristics of the coil electronic component.

[0173] In addition, in the coil electronic components manufactured according to Comparative Examples 2 and 3, the reduction rate of the inductance of the first coil is in the range of 9.44% to 14.94%, and the reduction rate of the DC resistance is in the range of 7.05% to 8.25%. In other words, when the thickness difference between the upper cover layer and the lower cover layer exceeds 160µm, the degree of reduction in the inductance of the first coil is greater than the degree of reduction in the DC resistance, thereby deteriorating the overall characteristics of the coil electronic component. This is because the thickness of the lower cover layer is too small compared to the thickness of the upper cover layer.

[0174] While the present disclosure has been described in conjunction with what are presently considered to be practical embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments. Rather, the present disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A coil electronic assembly, comprising: a magnetic body having a first surface and a second surface opposite to each other and including a first core and a second core spaced apart from the first core; a first coil embedded in the magnetic body and wound around the first core; a second coil embedded in the magnetic body and wound around the second core; a first electrode pad and a second electrode pad disposed on the second surface of the magnetic body and connected to the first coil; as well as a third electrode pad and a fourth electrode pad disposed on the second surface of the magnetic body and connected to the second coil, Wherein, a first distance from the first coil and the second coil to the first surface is greater than a second distance from the first coil and the second coil to the second surface.

2. The coil electronic component according to claim 1, wherein: The difference between the first distance and the second distance is in the range of 5µm to 160µm.

3. The coil electronic component according to claim 1 or 2, further comprising: a supporting member having a first supporting surface and a second supporting surface, wherein the first supporting surface faces the first surface of the magnetic body and the second supporting surface faces the second surface of the magnetic body, wherein the first coil comprises: a first coil pattern disposed on the first supporting surface of the supporting member; a second coil pattern disposed on the second supporting surface of the supporting member; and a first via hole penetrating the supporting member and connecting the first coil pattern and the second coil pattern, and The second coil includes: a third coil pattern disposed on the first supporting surface of the supporting member; a fourth coil pattern disposed on the second supporting surface of the supporting member; and a second via hole penetrating the supporting member and connecting the third coil pattern and the fourth coil pattern.

4. The coil electronic component according to claim 3, wherein: The first coil pattern includes a first winding pattern wound around the first core and a first extension pattern wound around the first core and the second core, The second coil pattern includes a second winding pattern wound around the first core and a second extension pattern wound around the first core and the second core, the third coil pattern includes a third winding pattern wound around the second core and a third extension pattern wound around the first core and the second core, and The fourth coil pattern includes a fourth winding pattern wound around the second core and a fourth extending pattern wound to surround the first core and the second core.

5. The coil electronic component according to claim 4, wherein: The winding direction of the first winding pattern and the winding direction of the second winding pattern are opposite to each other, and A winding direction of the third winding pattern and a winding direction of the fourth winding pattern are opposite to each other.

6. The coil electronic component according to claim 5, wherein: The winding direction of the first winding pattern and the winding direction of the third winding pattern are identical to each other, and The winding direction of the second winding pattern and the winding direction of the fourth winding pattern are identical to each other.

7. The coil electronic component according to claim 6, wherein: The winding direction of the first winding pattern and the winding direction of the first extending pattern are identical to each other, and The winding direction of the second winding pattern and the winding direction of the second extending pattern are identical to each other.

8. The coil electronic component according to claim 7, wherein: The winding direction of the third winding pattern and the winding direction of the third extending pattern are identical to each other, and The winding direction of the fourth winding pattern and the winding direction of the fourth extending pattern are identical to each other.

9. The coil electronic component according to claim 3, wherein: The first coil pattern includes a first winding pattern wound around the first core and a first extension pattern wound around the first core and the second core, The second coil pattern includes a second winding pattern wound around the first core and a second extension pattern extending from the second winding pattern toward the second core, The third coil pattern includes a third winding pattern wound around the second core and a third extension pattern wound to surround the first core and the second core, and The fourth coil pattern includes a fourth winding pattern wound around the second core and a fourth extension pattern extending from the fourth winding pattern toward the first core.

10. The coil electronic component according to claim 9, wherein: The winding direction of the first winding pattern and the winding direction of the second winding pattern are opposite to each other, and A winding direction of the third winding pattern and a winding direction of the fourth winding pattern are opposite to each other.

11. The coil electronic component according to claim 10, wherein: The winding direction of the first winding pattern and the winding direction of the third winding pattern are identical to each other, and The winding direction of the second winding pattern and the winding direction of the fourth winding pattern are identical to each other.

12. The coil electronic component according to claim 11, wherein: The winding direction of the first winding pattern and the winding direction of the first extending pattern are identical to each other, and The winding direction of the third winding pattern and the winding direction of the third extending pattern are identical to each other.

13. The coil electronic component according to claim 3, wherein: The first coil pattern includes a first winding pattern wound around the first core and a first extension pattern extending from the first winding pattern toward the second core, the second coil pattern is wound around the first core and the second core, The third coil pattern includes a third winding pattern wound around the second core and a third extension pattern extending from the third winding pattern toward the first core, and The fourth coil pattern is wound around the first core and the second core.

14. The coil electronic component according to claim 13, wherein: The winding direction of the first winding pattern and the winding direction of the second winding pattern are opposite to each other, and A winding direction of the third winding pattern and a winding direction of the fourth winding pattern are opposite to each other.

15. The coil electronic component according to claim 14, wherein: The winding direction of the first winding pattern and the winding direction of the third winding pattern are identical to each other, and The winding direction of the second winding pattern and the winding direction of the fourth winding pattern are identical to each other.

16. The coil electronics assembly according to claim 1, further comprising: a first connecting electrode embedded in the magnetic body and connecting the first electrode pad to the first coil; a second connecting electrode embedded in the magnetic body and connecting the second electrode pad to the first coil; a third connecting electrode embedded in the magnetic body and connecting the third electrode pad to the second coil; as well as A fourth connection electrode is embedded in the magnetic body and connects the fourth electrode pad to the second coil.

17. The coil electronics assembly according to claim 16, further comprising: a first dummy pad embedded in the magnetic body and spaced apart from the first coil, and the first connection electrode passes through the first dummy pad; as well as A second dummy pad is embedded in the magnetic body and spaced apart from the second coil, and the third connection electrode passes through the second dummy pad.

18. The coil electronic component according to claim 1 or 2, wherein: The magnetic body further has a third surface and a fourth surface that are opposite to each other and connect the first surface and the second surface. The first coil includes: a first lead portion extending from the third surface and connected to the first electrode pad; and a second lead portion extending from the fourth surface and connected to the second electrode pad, and The second coil includes a third lead-out portion extending from the fourth surface and connected to the third electrode pad, and a fourth lead-out portion extending from the third surface and connected to the fourth electrode pad.

19. The coil electronic component according to claim 1 or 2, wherein: The magnetic body further has a third surface and a fourth surface that are opposite to each other and connect the first surface and the second surface. The first coil includes: a first lead portion extending from the third surface and connected to the first electrode pad; and a second lead portion extending from the third surface and connected to the second electrode pad, and The second coil includes a third lead-out portion extending from the fourth surface and connected to the third electrode pad, and a fourth lead-out portion extending from the fourth surface and connected to the fourth electrode pad.

20. The coil electronic component according to claim 1 or 2, wherein: The magnetic body further comprises: a first covering layer located between the first surface and the first coil and between the first surface and the second coil; and a second covering layer located between the second surface and the first coil and between the second surface and the second coil, and The first cover layer is thicker than the second cover layer.

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