Coil electronic component

Abstract

To provide a coil electronic component having a coupled inductor structure that can ensure high inductance while easily adjusting a coupling coefficient and preventing displacement of a stacked coil.SOLUTION: The disclosed 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 partially embedded inside the first magnetic body, and a second coil at least partially embedded inside the second magnetic body, the first magnetic body has an integral structure including a base portion, a protruding portion protruding from the base portion, and a support portion protruding from the base portion while being spaced apart from the protruding portion, and the first coil can be wound around the protruding portion.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to coil electronics. [Background technology]

[0002] Recently, as the functions of mobile devices become more diverse and power consumption increases, coil electronic components with low loss and excellent efficiency are being adopted around power semiconductors (PMIC, power management integrated circuit) to increase battery life in mobile devices.

[0003] When a coil electronic component has a coupled inductor structure in which a primary coil and a secondary coil are stacked, a method is required to easily adjust a coupling coefficient (k) while ensuring high inductance.

[0004] In addition, it is necessary to prevent the primary coil and secondary coil from becoming misaligned with each other during the lamination process. Summary of the Invention [Problem to be solved by the invention]

[0005] An aspect of the embodiment provides a coil electronic component having a coupled inductor structure that ensures high inductance while allowing easy adjustment of a coupling coefficient.

[0006] Another aspect of the embodiment provides a coil electronic component having a coupled inductor structure capable of preventing displacement of the stacked coils.

[0007] However, the problem to be solved by the present embodiment is not limited to the above problem, and can be variously expanded within the scope of the technical ideas included in the present embodiment. [Means for solving the problem]

[0008] A coil electronic component according to one embodiment includes a main body including a first magnetic body and a second magnetic body facing the first magnetic body; a first coil at least partially embedded within the first magnetic body; and a second coil at least partially embedded within the second magnetic body, wherein the first magnetic body is an integral structure and includes a base portion, a protruding portion protruding from the base portion, and a support portion protruding from the base portion while being spaced apart from the protruding portion, and the first coil can be wound around the protruding portion.

[0009] The body may further include a third magnetic body disposed between the first magnetic body and the second magnetic body.

[0010] In addition, an outer surface of the third magnetic body and an outer surface of the first magnetic body may form an outer surface of the main body.

[0011] The third magnetic body may be at least partially in contact with the second coil and the second magnetic body.

[0012] The height of the protrusion and the height of the support may be different.

[0013] 3. The coil electronic component according to claim 2, wherein the third magnetic body may be at least partially in contact with the first coil, the protruding portion, and the supporting portion.

[0014] The first coil may be surrounded by the base portion, the protruding portion, the support portion, and the third magnetic body.

[0015] The third magnetic body may include a portion disposed between the first coil and the protruding portion.

[0016] The third magnetic body may include a portion disposed between the first coil and the support.

[0017] The aspect ratio of the first coil may be greater than or equal to 1.25:1 and less than or equal to 5:1, and the aspect ratio of the second coil may be greater than or equal to 1.25:1 and less than or equal to 5:1.

[0018] Furthermore, a coupling coefficient between the first coil and the second coil may be equal to or greater than 0.17 and equal to or less than 0.33.

[0019] The coil electronic component may further include a first external electrode disposed outside the body and connected to a first lead-out portion of the first coil; a second external electrode disposed outside the body and connected to a second lead-out portion of the first coil; a third external electrode disposed outside the body and connected to the first lead-out portion of the second coil; and a fourth external electrode disposed outside the body and connected to the second lead-out portion of the second coil.

[0020] 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.

[0021] Moreover, the first electrode layer and the fourth electrode layer may contain copper (Cu).

[0022] The first electrode layer and the fourth electrode layer may be conductive resin layers.

[0023] Also, 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.

[0024] Moreover, an insulating film may be provided on a surface of the first coil and a surface of the second coil.

[0025] Moreover, the third magnetic body can have a magnetic permeability different from the magnetic permeability of the first magnetic body and the second magnetic body.

[0026] Moreover, the third magnetic body can be formed from a material different from that of the first magnetic body and the second magnetic body.

[0027] Moreover, the first magnetic body, the second magnetic body, and the third magnetic body can include metal magnetic particles made of a soft magnetic alloy. Effect of the Invention

[0028] According to the coil electronic component according to the embodiment, a high inductance is ensured while the coupling coefficient can be easily adjusted.

[0029] According to the coil electronic component according to the embodiment, it is possible to prevent the position of the stacked coils from becoming misaligned. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view showing a coil electronics component according to an embodiment; [Diagram 2] FIG. 2 is a plan view illustrating the coil electronic component of FIG. [Diagram 3] FIG. 2 is a bottom view showing the coil electronic component of FIG. 1. [Figure 4] FIG. 2 is a schematic cross-sectional view taken along line IV-IV′ in FIG. [Diagram 5] FIG. 2 is a perspective view showing a schematic view of a first magnetic body of the coil electronic component of FIG. [Figure 6] 6 is a schematic cross-sectional view taken along line VI-VI' in FIG. 5. [Figure 7] FIG. 11 is a cross-sectional view that illustrates a schematic view of a first magnetic body of a coil electronic component according to a modified example. [Figure 8] FIG. 13 is a perspective view showing a schematic view of a first magnetic body of a coil electronic component according to another modified example. [Figure 9] FIG. 11 is a cross-sectional view showing a coil electronic component according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. In order to clearly explain the present invention in the drawings, parts that are not necessary for the explanation are omitted, and the same or similar components are given the same reference numerals throughout the specification. In addition, in the accompanying drawings, some components are exaggerated, omitted, or shown in a schematic manner, and the size of each component does not entirely reflect the actual size.

[0032] The attached drawings are merely intended to facilitate understanding of the embodiments disclosed in this specification, and the attached drawings do not limit the technical ideas disclosed in this specification, and it should be understood that the attached drawings include all modifications, equivalents, or alternatives included in the idea and technical scope of the present invention.

[0033] Terms including ordinal numbers such as first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another.

[0034] Furthermore, when a part such as a layer, film, region, or plate is said to be "on" or "above" another part, this includes not only the case where it is directly on top of the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly on" another part, it means that there is no other part in between. Furthermore, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "on" or "above" the direction opposite to gravity.

[0035] Throughout the specification, the terms "comprise" or "have" are intended to specify the presence of any feature, numeral, step, operation, component, part, or combination thereof described in the specification, but should be understood as not precluding the presence or additional possibility of one or more other features, numerals, steps, operations, components, parts, or combinations thereof. Thus, when a part is said to "comprise" a certain element, this means that it can further include other elements, but not to the exclusion of other elements, unless specifically stated to the contrary.

[0036] Also, throughout the specification, a reference to "in a plane" means a view of the part as viewed from above, and a reference to "in cross section" means a view of the part as viewed from the side through a vertical cut.

[0037] In addition, throughout the specification, when the term "connected" is used, this does not only mean that two or more components are directly connected, but also that two or more components are indirectly connected through other components, or that they are not only physically connected, but also electrically connected, or that they are referred to by different names depending on their position or function but are still one body.

[0038] FIG. 1 is a schematic perspective view of a coil electronic component according to one embodiment, FIG. 2 is a schematic plan view of the coil electronic component of FIG. 1, FIG. 3 is a schematic bottom view of the coil electronic component of FIG. 1, FIG. 4 is a schematic cross-sectional view taken along line IV-IV' in FIG. 1, FIG. 5 is a schematic perspective view of a first magnetic body of the coil electronic component of FIG. 1, and FIG. 6 is a schematic cross-sectional view taken along line VI-VI' in FIG. 5.

[0039] 1, 2, 3, 4, 5 and 6, a coil electronic component 1000 according to one embodiment includes a main 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.

[0040] The body 100 may be formed in a roughly rectangular hexahedron shape, but the present embodiment is not limited thereto. The body 100 may have a substantially rectangular hexahedron shape, but not a perfect rectangular hexahedron shape, due to shrinkage of the magnetic powder during sintering. For example, the body 100 may have a roughly rectangular hexahedron shape, but the corners and vertices may be rounded.

[0041] In this embodiment, for ease of explanation, the two surfaces facing each other in the longitudinal direction (L-axis direction) are defined as the first surface S1 and the second surface S2, the two surfaces facing each other in the width direction (W-axis direction) are defined as the third surface S3 and the fourth surface S4, and the two surfaces facing each other in the thickness direction (T-axis direction) are defined as the fifth surface S5 and the sixth surface S6.

[0042] The length of the coil electronic component 1000 may refer to the maximum length of a plurality of line segments parallel to the length direction (L axis direction) by connecting two outermost boundary lines facing each other in the length direction (L axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph described above, based on an optical microscope or SEM (Scanning Electron Microscope) photograph of a cross section in the length direction (L axis direction)-thickness direction (T axis direction) at the center of the width direction (W axis direction) of the coil electronic component 1000. Alternatively, the length of the coil electronic component 1000 may refer to the minimum length of a plurality of line segments parallel to the length direction (L axis direction) by connecting two outermost boundary lines facing each other in the length direction (L axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph described above. Alternatively, the length of the coil electronic component 1000 may refer to the arithmetic average value of the lengths of at least two line segments parallel to the length direction (L axis direction) by connecting two outermost boundary lines facing each other in the length direction (L axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph described above.

[0043] The thickness of the coil electronic component 1000 may refer to the maximum value of the lengths of a plurality of line segments parallel to the thickness direction (T axis direction) by connecting two outermost boundary lines facing each other in the thickness direction (T axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph, based on an optical microscope or SEM (Scanning Electron Microscope) photograph of a length direction (L axis direction)-thickness direction (T axis direction) cross section at the center of the width direction (W axis direction) of the coil electronic component 1000. Alternatively, the thickness of the coil electronic component 1000 may refer to the minimum value of the lengths of a plurality of line segments parallel to the thickness direction (T axis direction) by connecting two outermost boundary lines facing each other in the thickness direction (T axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph. Alternatively, the thickness of the coil electronic component 1000 may refer to the arithmetic average value of the lengths of at least two line segments parallel to the thickness direction (T axis direction) by connecting two outermost boundary lines facing each other in the thickness direction (T axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph.

[0044] The width of the coil electronic component 1000 may refer to the maximum value of the lengths of a plurality of line segments parallel to the width direction (W axis direction) by connecting two outermost boundary lines facing each other in the width direction (W axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph described above, based on an optical microscope or SEM (Scanning Electron Microscope) photograph of a length direction (L axis direction)-width direction (W axis direction) cross section at the center of the thickness direction (T axis direction) of the coil electronic component 1000. Alternatively, the width of the coil electronic component 1000 may refer to the minimum value of the lengths of a plurality of line segments parallel to the width direction (W axis direction) by connecting two outermost boundary lines facing each other in the width direction (W axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph described above. Alternatively, the width of the coil electronic component 1000 may refer to the arithmetic average value of the lengths of at least two line segments parallel to the width direction (W axis direction) by connecting two outermost boundary lines facing each other in the width direction (W axis direction) of the coil electronic component 1000 shown in the cross-sectional photograph described above.

[0045] Meanwhile, the length, width and thickness of the coil electronic component 1000 may be measured by a micrometer measurement method. The micrometer measurement method may be performed by setting a zero point with a micrometer that has been subjected to Gage R&R (Repeatability and Reproducibility), inserting the coil electronic component 1000 according to the present embodiment between the tips of the micrometer, and rotating the measurement lever of the micrometer. Meanwhile, when the length of the coil electronic component 1000 is measured by the micrometer measurement method, the length of the coil electronic component 1000 may mean a value measured once or may mean an arithmetic average of values ​​measured multiple times. This may be similarly applied to the measurement of the width and thickness of the coil electronic component 1000.

[0046] The main body 100 forms the exterior of the coil electronic component 1000, and is a space in which a magnetic path is formed, which is a path through which the magnetic flux induced in the first coil 200 and the magnetic flux induced in the second coil 300 pass, when a current is applied to the first coil 200 through the first external electrode 500 and the second external electrode 600 and a current is applied to the second coil 300 through the third external electrode 700 and the fourth external electrode 800.

[0047] The body 100 encapsulates the first coil 200 and the second coil 300 and includes a magnetic material. The body 100 includes magnetic particles, and an insulating material may be interposed between the magnetic particles.

[0048] For example, the main body 100 may include a first magnetic body 110, a second magnetic body 120, and a third magnetic body 130, and the first magnetic body 110, the second magnetic body 120, and the third magnetic body 130 may each include magnetic particles, and an insulating material may be interposed between the magnetic particles. The first magnetic body 110, the second magnetic body 120, and the third magnetic body 130 will be described later.

[0049] The magnetic material may include a first metal magnetic powder, a second metal magnetic powder having a larger particle size than the first metal magnetic powder, and a third metal magnetic powder having a larger particle size than the second metal magnetic powder. The average particle size (D 50 ) may be 0.1 μm or more and 0.2 μm or less, and the average particle size (D 50 ) may be 1 μm or more and 2 μm or less, and the average particle size (D 50 ) may be 25 μm or more and 30 μm or less.

[0050] The magnetic particles may be ferrite particles or metallic magnetic particles that exhibit magnetic properties.

[0051] The ferrite particles may be, for example, at least one of spinel-type ferrites such as Mg-Zn, Mn-Zn, Mn-Mg, Cu-Zn, Mg-Mn-Sr, and Ni-Zn-based ferrites; hexagonal-type ferrites such as Ba-Zn, Ba-Mg, Ba-Ni, Ba-Co, and Ba-Ni-Co-based ferrites; garnet-type ferrites such as Y-based ferrites; and Li-based ferrites.

[0052] The metal magnetic particles may be composed of two or more kinds of powders with 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 pure iron or a soft magnetic alloy. When the metal magnetic particles are soft magnetic alloys, the metal magnetic particles may be at least one of 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, the different compositions of the metal magnetic particles may mean different contents.

[0053] The metal magnetic particles may be amorphous or crystalline. For example, the metal magnetic particles may be Fe-Si-B-Cr based amorphous alloys, but the present embodiment is not limited thereto. The metal magnetic particles may have an average particle size of about 0.1 μm to 30 μm, but is not limited thereto. In this specification, the average particle size is defined as D 90 Or D 50 Particle size distribution can refer to the particle size distribution expressed as: D 50 (Particle size corresponding to 50% cumulative volume of particle size distribution) indicates the average particle size.

[0054] The metal magnetic particles may be two or more different types of metal magnetic particles, where different types of metal magnetic particles means that the metal magnetic particles are distinguished from one another in at least one of the average particle size, composition, component ratio, crystallinity, and shape.

[0055] The insulating material may include, but is not limited to, epoxy, polyimide, liquid crystal polymer, and the like, either alone or in combination.

[0056] The first coil 200 and the second coil 300 are disposed inside the body 100 and exhibit the characteristics of a coil electronic component. For example, when the coil electronic component 1000 of the present embodiment is used as a power inductor, when a current is applied to the first coil 200 and the second coil 300, the coil electronic component 1000 can serve to stabilize the power supply of an electronic device by storing energy in the form of a magnetic field and maintaining an output voltage.

[0057] The first coil 200 and the second coil 300 may be magnetically coupled to each other to form a coupled inductor structure.

[0058] The first coil 200 and the second coil 300 may be in the form of a metal (e.g., copper (Cu) or silver (Ag)) wire whose surface is coated with an insulating material and wound in a spiral shape. That is, the first coil 200 and the second coil 300 may be a wire-wound coil. The first coil 200 and the second coil 300 are not limited to a single wire, and may be a twisted wire or a wire consisting of two or more wires.

[0059] The first coil 200 and the second coil 300 may be, but are not limited to, a circular coil, and may be any of various known coils, such as a rectangular coil, a race track shaped coil, etc.

[0060] The cross sections of the individual wires of the first coil 200 and the second coil 300 may have various known shapes such as a square, a circle, an ellipse, or the like.

[0061] When the cross-sectional shape of the individual wires of the first coil 200 is approximately rectangular, it 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 face each other along 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 face each other along the length direction (L-axis direction).

[0062] When the cross-sectional shape of the individual wires of the second coil 300 is approximately rectangular, it 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 face each other along 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 face each other along the length direction (L-axis direction).

[0063] Each of the first coil 200 and the second coil 300 may be composed of 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 and disposed on the upper side of the lower coil 200A, i.e., on the fifth surface S5 side of the body 100 to form a layer. 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 and disposed on the upper side of the lower coil 300A, i.e., on the fifth surface S5 side of the body 100 to form a layer.

[0064] The first coil 200 and the second coil 300 may have multiple turns.

[0065] For example, the first coil 200 may include, in sequence from the outer surface side of the body 100 toward the inside, an outermost turn coil C1, at least one intermediate turn coil C2, and an innermost turn coil C3.

[0066] Similarly, the second coil 300 may include, in sequence from the outer surface side of the body 100 toward the inside, an outermost turn coil C1', at least one intermediate turn coil C2', and an innermost turn coil C3'.

[0067] An insulating film IF may be provided along the surface of each of the multiple turns of the first coil 200 and the second coil 300. The insulating film IF is for protecting and insulating the multiple turns of the first coil 200 and the second coil 300, and may include a known insulating material such as Parylene. The insulating material included in the insulating film IF may be any material and is not particularly limited. For example, the insulating film IF may be a polyurethane resin, a polyester resin, an epoxy resin, or a polyamideimide resin. The insulating film IF may be formed by a method such as vapor phase deposition, but is not limited thereto.

[0068] The first coil 200 may include a winding portion 210 and a lead-out portion 220 .

[0069] The winding portion 210 is a portion in which the metal wire makes at least one turn.

[0070] The lead-out portions 220 extend from both ends of the winding portion 210 and are exposed to the sixth surface S6 of the main 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 to the sixth surface S6 of the main body 100, and the second lead-out portion 225 extends from the other end of the winding portion 210 and is exposed to the sixth surface S6 of the main body 100.

[0071] Meanwhile, the portions of the first and second drawers 223 and 225 exposed on the sixth surface S6 of the body 100 may be spaced apart from each other in the length direction (L-axis direction), but are not limited thereto.

[0072] The second coil 300 may include a winding portion 310 and an extraction portion 320 .

[0073] The winding portion 310 is a portion in which the metal wire makes at least one turn.

[0074] The lead-out portions 320 extend from both ends of the winding portion 310 and are exposed to the sixth surface S6 of the main 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 to the sixth surface S6 of the main body 100, and the second lead-out portion 325 extends from the other end of the winding portion 310 and is exposed to the sixth surface S6 of the main body 100.

[0075] Meanwhile, the portions of the first and second drawers 323 and 325 exposed on the sixth surface S6 of the body 100 may be spaced apart from each other in the length direction (L-axis direction), but are not limited thereto.

[0076] If the length of the coil electronic component is constant, the wider the core of the main body, the larger the area of ​​the magnetic path, and therefore the greater the capacity. Also, the smaller the margin in the length direction (L-axis direction) of the main body, the greater the capacity. In other words, if the size of the margin is reduced, the coil is positioned farther away from the center of the main body, and the width of the core increases, increasing the capacity.

[0077] In order to increase the capacity by increasing the width of the core of the coil electronic component and decreasing the size of the margin portion, in this embodiment, the ratio of the thickness to the width of the cross section of the first coil 200 and the second coil 300, i.e., the aspect ratio, can be adjusted.

[0078] The aspect ratio of the cross section of the first coil 200 may be greater than or equal to 1.25:1 and less than or equal to 5:1, and the aspect ratio of the cross section of the second coil 300 may be greater than or equal to 1.25:1 and less than or equal to 5:1.

[0079] If the aspect ratio is less than 1.25:1, the core width may be too small, resulting in a reduced capacitance. That is, the coupling coefficient between the first coil 200 and the second coil 300 may have a negative value. If the aspect ratio is more than 5:1, the core width may be too large, resulting in a reduced capacitance. That is, the coupling coefficient between the first coil 200 and the second coil 300 may have a negative value.

[0080] The aspect ratio of the cross section of the first coil 200 and the aspect ratio of the cross section of the second coil 300 are calculated based on 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 measured based on an optical microscope or a scanning electron microscope (SEM) photograph of a cross section (hereinafter referred to as an “LT cross section”) cut perpendicular to the width direction (W axis direction) from the center of the width direction (W axis direction) of the coil electronic component 1000 in the length direction (L axis direction) - thickness direction (T axis direction).

[0081] For example, the thickness of the cross section of the first coil 200 (or the second coil 300) may refer to the maximum length of a plurality of line segments connecting both ends of the cross section in the thickness direction in the above-mentioned 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 length of a plurality of line segments connecting both ends of the cross section in the width direction in the above-mentioned LT cross section photograph.

[0082] As another example, the thickness of the cross section of the first coil 200 (or the second coil 300) may mean the arithmetic average value of the maximum and minimum values ​​of the lengths of a plurality of line segments connecting both ends of the cross section in the thickness direction in the above-mentioned LT cross section photograph, and the width of the cross section of the first coil 200 (or the second coil 300) may mean the arithmetic average value of the maximum and minimum values ​​of the lengths of a plurality of line segments connecting both ends of the cross section in the width direction in the above-mentioned LT cross section photograph. However, if the cross section has a protruding or convex region in the thickness direction, the width may be measured in the remaining region excluding this region.

[0083] The aspect ratio of the first coil 200 (or the second coil 300) can be calculated based on the thickness and width of the cross section of the first coil 200 (or the second coil 300) measured as described above. For example, the aspect ratio of the first coil 200 (or the second coil 300) may be the arithmetic average value of the aspect ratios of the cross sections measured in the above-mentioned LT cross section photograph.

[0084] The main body 100 may include a first magnetic body 110, a second magnetic body 120, and a third magnetic body 130.

[0085] The first magnetic body 110 includes a magnetic material and encapsulates the first coil 200. The first magnetic body 110 includes magnetic particles, and an insulating material may be interposed between the magnetic particles.

[0086] The first magnetic body 110 includes a base 111, a protruding portion 113, a supporting portion 115, and a recess 117, and forms part of the exterior of the main body 100. The first magnetic body 110 can form part of the first surface S1, part of the second surface S2, part of the third surface S3, part of the fourth surface S4, and the sixth surface S6 of the main body 100. Meanwhile, the first magnetic body 110 may be an integral structure. That is, the base 111, the protruding portion 113, and the supporting portion 115 of the first magnetic body 110 can be integrally formed. For example, the first magnetic body 110 can be formed by filling a magnetic material into a mold. The first magnetic body 110 can be formed by filling a composite material including a magnetic material and an insulating resin into a mold.

[0087] 6, the cross section of the first magnetic body 110 in the length direction (L-axis direction) and thickness direction (T-axis direction) may be in the shape of the letter E. That is, a protrusion 113 is disposed at the center of a base 111, and support parts 115 spaced apart from the protrusion 113 are disposed on both side edges of the base 111. A height H1 of the protrusion 113 and a height H2 of the support part 115 may be the same.

[0088] The heights of the protrusions 113 and the supports 115 are measured based on an optical microscope or scanning electron microscope (SEM) photograph of a cross section in the length direction (L axis direction)-thickness direction (T axis direction) at the center in the width direction (W axis direction) of the coil electronic component 1000. The heights of the protrusions 113 and the supports 115 may be the arithmetic average of the heights of the protrusions 113 and the supports 115 at five points equally spaced apart from the protrusions 113 and the supports 115 of the coil electronic component 1000 shown in the cross-sectional photograph.

[0089] 7, the heights of the protrusion 113 and the support 115' may be different. For example, the height H2' of the support 115' may be smaller than the height H1' of the protrusion 113. However, since the support 115' protrudes from the surface of the base 111, the height H2' of the support 115' is greater than 0.

[0090] The base portion 111 forms part of the exterior of the first magnetic body 110, and a protrusion portion 113 and a support portion 115 are disposed on one surface of the base portion 111.

[0091] For example, the base 111 may include a front surface 111A and a back surface 111B that face each other in the width direction (W-axis direction), and a bottom surface 111C and a top surface 111D that face each other in the thickness direction (T-axis direction). The bottom surface 111C of the base 111 may form a sixth surface S6 of the main body 100.

[0092] The protruding portion 113 is a portion protruding from the upper surface 111D of the base portion 111. For example, the protruding portion 113 may protrude in the thickness direction (T-axis direction) from the center of the base portion 111. The first coil 200 is wound around the protruding portion 113. The shape of the protruding portion 113 as viewed from the thickness direction (T-axis direction) is not particularly limited, and may be a polygon such as a circle, an ellipse, a triangle, or a rectangle. The protruding portion 113 may have various known shapes that can be accommodated in the hollow of the first coil 200. For example, the shape of the protruding portion may be the same as the hollow shape of the first coil in the longitudinal (L-axis)-width (W-axis) cross section.

[0093] The support portion 115 is a portion that protrudes from the upper surface 111D of the base portion 111. The support portion 115 protrudes from the edge of the base portion 111 in the thickness direction (T-axis direction) and is therefore separated from the protrusion portion 113.

[0094] The support portion 115 may be multiple.

[0095] 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).

[0096] The first to fourth support parts 115A, 115B, 115C, and 115D may not be connected to each other. That is, first to fourth grooves 117A, 117B, 118A, and 118B may be present between the respective support parts 115A, 115B, 115C, and 115D, as described below. Lead-out parts 223, 225, 323, and 325 of the first coil 200 and the second coil 300 may be led out through the first to fourth grooves 117A, 117B, 118A, and 118B and connected to the external electrodes 500, 600, 700, and 800.

[0097] The recess 117 is a region between the protrusion 113 and the support 115. The first coil 200 can be disposed in the recess 117 while being wound around the protrusion 113. That is, the protrusion 113 is disposed to penetrate the hollow space of the first coil 200, so that the first coil 200 can be accommodated in the recess 117 of the first magnetic body 110. The recess 117 can have a size large enough to accommodate the first coil 200. However, thereafter, in the process of pressing the second magnetic body 120 and the third magnetic body 130 to the first magnetic body 110, the protrusion 113 and the support 115 of the first magnetic body 110 are pressured and expand laterally, so that the recess 117 can be contracted. As the recess 117 contracts, the first coil 200 can be in close contact with the protrusion 113 and the support 115. Meanwhile, during this process, the third magnetic body 130 may be extended between the first coil 200 and the protruding portion 113 while being subjected to pressure, and may be extended between the first coil 200 and the supporting portion 115. That is, a portion of the third magnetic body 130 may be present between the first coil 200 and the protruding portion 113, and a portion of the third magnetic body 130 may be present between the first coil 200 and the supporting portion 115. In other words, the third magnetic body 130 may be at least partially in contact with the first coil 200, the protruding portion 113, and the supporting portion 115.

[0098] On the other hand, when the first magnetic body 110 does not have the support portion 115 but only has the protrusion portion 113, that is, when the cross section of the first magnetic body 110 in the length direction (L axis direction)-thickness direction (T axis direction) is in the shape of an alphabet T, the second magnetic body 120 and the third magnetic body 130 fill the area around the protrusion portion 113 of the first magnetic body 110 in the process of pressing the second magnetic body 120 and the third magnetic body 130 to the first magnetic body 110. However, since the first magnetic body 110 does not have the support portion 115, the second magnetic body 120 and the third magnetic body 130 flow (or permeate) into the area around the protrusion portion 113 without receiving pressure (or resistance force) in the opposite direction from the support portion 115, and the second coil 300 moves together with the movement of the second magnetic body 120 and the third magnetic body 130, and the position of the second coil 300 may be shifted.

[0099] On the other hand, according to this embodiment, the first magnetic body 110 has an E shape including the support portion 115 as well as the protrusion portion 113, so that the second magnetic body 120 and the third magnetic body 130 flow (or permeate) into the recess 117 of the first magnetic body 110 while receiving opposite pressure (or resistance force) from the support portion 115, and therefore the movement of the second coil 300 is relatively restricted, thereby reducing misalignment.

[0100] The base portion 111 may be provided with first to fourth grooves 117A, 117B, 118A, and 118B.

[0101] The first groove 117A and the second groove 117B may be disposed on both 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 portion 223 and the second lead portion 225 of the first coil 200. For example, the first lead portion 223 may extend along the first groove 117A and be connected to the first external electrode 500, and the second lead portion 225 may extend along the second groove 117B and be connected to the second external electrode 600. However, this embodiment is not limited thereto, and the first lead portion and the second lead portion may extend in various directions.

[0102] The first groove 117A and the second groove 117B may have a depth and width capable of accommodating the first lead portion 223 and the second lead portion 225, respectively. For example, the depth of the first groove 117A and the second groove 117B may be equal to or smaller than the thickness of the first lead portion 223 and the second lead portion 225, and the width of the first groove 117A and the second groove 117B may be equal to or larger than the width of the first lead portion 223 and the second lead portion 225.

[0103] The third groove 117C and the fourth groove 117D may be disposed on both 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 portion 323 and the second lead portion 325 of the second coil 300. For example, the first lead portion 323 may extend along the third groove 117C and be connected to the third external electrode 700, and the second lead portion 325 may extend along the fourth groove 117D and be connected to the fourth external electrode 800. However, this embodiment is not limited thereto, and the first lead portion and the second lead portion may extend in various directions.

[0104] The third groove 117C and the fourth groove 117D may have a depth and width capable of respectively accommodating the first lead portion 323 and the second lead portion 325. For example, the depth of the third groove 117C and the fourth groove 117D may be equal to or smaller than the thickness of the first lead portion 323 and the second lead portion 325, and the width of the third groove 117C and the fourth groove 117D may be equal to or larger than the width of the first lead portion 323 and the second lead portion 325.

[0105] 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. Here, the side surface 1151 of the first support portion 115A may be flush with the exposed surface 119A of the base 111, and the side surface 1152 of the fourth support portion 115D may be flush 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'.

[0106] However, the base does not necessarily need to have a groove, and depending on the method of forming the base and the method of arranging the lead-out portions, the groove may be omitted.

[0107] The second magnetic body 120 includes a second core 123. The second core 123 may be a region in which a hollow space of the second coil 300 is at least partially filled with the second magnetic body 120.

[0108] The second magnetic body 120 forms part of the exterior of the main body 100 while surrounding at least a portion of the second coil 300. That is, the second magnetic body 120 can form part of the first surface S1, part of the second surface S2, part of the third surface S3, part of the fourth surface S4, and part of the fifth surface S5 of the main body 100.

[0109] There is no particular limitation on the method for forming the second magnetic body 120. For example, the second magnetic body 120 may be formed by disposing a sheet made of a magnetic material on the upper portion of the second coil 300, and then compressing and curing the sheet.

[0110] In this manner, the second core 123 may be a portion formed by filling the hollow space of the second coil 300 in the 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 is an integrated structure, the protruding portion 113 of the first magnetic body 110 penetrates the hollow space of the first coil 200 while protruding from the base portion 111.

[0111] 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 be in contact with both the first magnetic body 110 and the second magnetic body 120.

[0112] The third magnetic body 130 may include a first surface 131 and a second surface 133 that face each other in the thickness direction (T-axis direction). The first surface 131 of the third magnetic body 130 may be in contact with the protruding portion 113 and the supporting portion 115 of the first magnetic body 110. The first surface 131 of the third magnetic body 130 may be in contact with a portion of the first coil 200, for example, the first coil surface 201. That is, the third magnetic body 130 may be in contact with all of the protruding portion 113 and the supporting portion 115 of the first magnetic body 110 and the first coil 200.

[0113] Meanwhile, the third magnetic body 130 may be in contact with a part of the second magnetic body 120 and a part of the second coil 300. That is, the second surface 133 of the third magnetic body 130 may be in contact with the surface of the second magnetic body 120 facing the first magnetic body 110, and the second surface 133 of the third magnetic body 130 may be in contact with the second coil surface 302 of the second coil 300.

[0114] The third magnetic body 130 may have a rectangular shape when viewed in the thickness direction (T-axis direction), but is not limited thereto. The third magnetic body 130 may have a shape similar to that of the winding part 210 of the first coil 200 or the winding part 310 of the second coil 300, for example.

[0115] 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 the outer surface of the main body 100 (e.g., the first surface S1 or the second surface S2).

[0116] Meanwhile, the third magnetic body 130 does not have to extend to the edge of the first magnetic body 110. In this case, the third magnetic body 130 does not form the outer surface of the main body 100. In other words, the edge of the third magnetic body 130 contacts the first magnetic body 110.

[0117] The third magnetic body 130 may include a magnetic material and may affect the 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 may be interposed between the magnetic particles.

[0118] The permeability of the third magnetic body 130 may be smaller than that of the first magnetic body 110 and smaller than that of the second magnetic body 120. In this case, the third magnetic body 130 may be formed of a material different from that of the first magnetic body 110 and the second magnetic body 120. The composition of the material constituting the magnetic body can be inferred from a scanning electron microscope (SEM) photograph of the coil electronic component. Furthermore, the permeability of the first magnetic body 110, the permeability of the second magnetic body 120, and the permeability of the third magnetic body 130 may be appropriately set to adjust the coefficient of coupling (k) between the first coil 200 and the second coil 300.

[0119] For example, in 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 volume fraction of the first magnetic particles contained in the first magnetic body 110 (or the second magnetic body 120) and the volume fraction of the second magnetic particles contained in the third magnetic body 130 may be made different from each other. Here, the volume fraction of the magnetic particles means 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 permeability of the first magnetic body 110 (or the second magnetic body 120) and the third magnetic body 130 by the volume fraction of the first magnetic particles and the second magnetic particles, the first magnetic particles and the second magnetic particles may be realized with the same material, for example, a metal alloy of the same composition. Meanwhile, by 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 contained in the first magnetic body 110 (or the second magnetic body 120) and the area fraction of the second magnetic particles contained in the third magnetic body 130 can be made different from each other when viewed cross-sectionally. Here, the area fraction of the magnetic particles means 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.

[0120] When the magnetic permeability of the third magnetic body 130 is smaller than that of the first magnetic body 110 (or the second magnetic body 120), the volume fraction of the second magnetic particles contained in the third magnetic body 130 may be smaller than the volume fraction of the first magnetic particles contained in the first magnetic body 110 (or the second magnetic body 120). When the magnetic permeability of the third magnetic body 130 is smaller than that of the first magnetic body 110 (or the second magnetic body 120), the coupling coefficient between the first coil 200 and the second coil 300 may increase relatively. Here, the relatively increase in the coupling coefficient means that the coupling coefficient is larger than when 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. When the magnetic permeability of the third magnetic body 130 is relatively small, the amount of magnetic flux flowing through 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 becomes large. Here, the magnetic flux flowing through the third magnetic body 130 can be understood to flow in the length direction (L-axis direction) of the third magnetic body 130 in FIG.

[0121] As a result, the mutual inductance between the first coil 200 and the second coil 300 becomes large and the leakage inductance formed only in the first coil 200 or the second coil 300 becomes small, so that the coupling coefficient between the first coil 200 and the second coil 300 becomes large.

[0122] The first external electrode 500 and the second external electrode 600 are provided outside the body 100 and are electrically connected to the first coil 200 .

[0123] The first external electrode 500 is disposed on a sixth surface S6 of the body 100 , and the first lead-out portion 223 of the first coil 200 is exposed to the sixth surface S6 of the body 100 and connected to the first external electrode 500 .

[0124] The second external electrode 600 is disposed on a sixth surface S6 of the body 100 , and the second lead-out portion 225 of the first coil 200 is exposed to the sixth surface S6 of the body 100 and connected to the second external electrode 600 .

[0125] The first external electrode 500 and the second external electrode 600 may be formed from a conductive material such as, but not limited to, copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Cr), titanium (Ti), or an alloy thereof.

[0126] The first external electrode 500 and the second external electrode 600 may include a plurality of metal layers formed by plating a conductive metal.

[0127] Referring to the left circle of FIG. 1, the first external electrode 500 may include a first metal layer 501 , a second metal layer 502 , and a third metal layer 503 .

[0128] The first metal layer 501 is 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 is a plating layer covering the first metal layer 501, and may include nickel (Ni). The third metal layer 503 is 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 a two-layer structure in which only one plating layer is added on the first metal layer 501 is also possible.

[0129] Referring to the right circle of FIG. 1, the second external electrode 600 may include a first metal layer 601 , a second metal layer 602 , and a third metal layer 603 .

[0130] The first metal layer 601 is 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 is a plating layer covering the first metal layer 601, and may include nickel (Ni). The third metal layer 603 is 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 a two-layer structure in which only one plating layer is added on the first metal layer 601 is also possible.

[0131] Thus, the first external electrode 500 and the second external electrode 600 may 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 be formed in a combination of nickel (Ni), copper (Cu), nickel / copper (Ni / Cu), palladium / nickel (Pd / Ni), palladium / nickel / copper (Pd / Ni / Cu), and copper / nickel / copper (Cu / Ni / Cu).

[0132] In some cases, the outermost layer may be made of tin (Sn). Since a tin-plated layer has a relatively low melting point, it is possible to improve the ease of mounting the first external electrode 500 and the second external electrode 600 on a board.

[0133] In general, the tin plating layer can be bonded to the electrode pad on the substrate through a solder containing a tin (Sn)-copper (Cu)-silver (Ag) alloy paste. That is, the tin plating layer can be melted and bonded to the solder during a heat treatment (reflow) process.

[0134] As another example, the first external electrode 500 and the second external electrode 600 may include a plurality of electrode layers. For example, the first external electrode 500 and the second external electrode 600 may 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) or may be a conductive resin layer. The conductive resin layer may include a conductive metal for ensuring electrical conductivity and a resin for shock absorption. The resin is not particularly limited as long as it has bonding and shock absorption properties and can be mixed with a conductive metal powder to make a paste, and may include, for example, a phenol resin, an acrylic resin, a silicon resin, an epoxy resin, or a polyimide resin. The conductive metal may include, for example, copper (Cu), tin (Sn), nickel (Ni), silver (Ag), palladium (Pd), gold (Au), platinum (Pt), tungsten (W), titanium (Ti), an alloy thereof, or a combination thereof.

[0135] The third external electrode 700 and the fourth external electrode 800 are provided outside the body 100 and are electrically connected to the second coil 300 .

[0136] The third external electrode 700 is disposed on a sixth surface S6 of the body 100, and the first lead-out portion 323 of the second coil 300 is exposed to the sixth surface S6 of the body 100 and connected to the third external electrode 700.

[0137] The fourth external electrode 800 is disposed on a sixth surface S6 of the body 100, and the second lead-out portion 325 of the second coil 300 is exposed to the sixth surface S6 of the body 100 and connected to the fourth external electrode 800.

[0138] The structures and components of the third external electrode 700 and the fourth external electrode 800 are the same as those of the first external electrode 500 and the second external electrode 600 described above, and therefore a duplicated description thereof will be omitted.

[0139] Meanwhile, the main body 100 of the coil electronic component 1000 according to the present embodiment may be provided with an insulating layer 900 in an area other than the areas where the first external electrode 500, the second external electrode 600, the third external electrode 700, and the fourth external electrode 800 are arranged. Alternatively, an insulating layer may be present in an area between an exposed portion of the first lead portion 223 of the first coil 200, an exposed portion of the second lead portion 225 of the first coil 200, an exposed portion of the first lead portion 323 of the second coil 300, and an exposed portion of the second lead portion 325 of the second coil 300 on the sixth surface S6 of the main body 100. 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.

[0140] In this manner, the insulating layer 900 is disposed on at least a portion 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 main body 100, thereby preventing electrical shorts between other electronic components and the external electrodes 500, 600, 700, 800.

[0141] The insulating layer 900 can be used as a resist when forming the external electrodes 500, 600, 700, and 800 by electrolytic plating, but is not limited thereto.

[0142] Meanwhile, the shapes of the external electrodes 500, 600, 700, and 800 according to the present embodiment are not limited to those described above, and may be various shapes.

[0143] For example, the first external electrode 500 may be connected to the first lead-out portion 223 of the first coil 200 at the sixth surface S6 of the body 100 and may extend to the second surface S2 of the body 100. Also, the second external electrode 600 may be connected to the second lead-out portion 225 of the first coil 200 at the sixth surface S6 of the body 100 and may extend to the first surface S1 of the body 100. The third external electrode 700 may be connected to the first lead-out portion 323 of the second coil 300 at the sixth surface S6 of the body 100 and may extend to the first surface S1 of the body 100. Also, the fourth external electrode 800 may be connected to the second lead-out portion 325 of the second coil 300 at the sixth surface S6 of the body 100 and may extend to the second surface S2 of the body 100.

[0144] As another example, the first external electrode 500 may be connected to the first lead-out portion 223 of the first coil 200 at the sixth surface S6 of the body 100 and may extend to the second surface S2 and the fifth surface S5 of the body 100. Also, the second external electrode 600 may be connected to the second lead-out portion 225 of the first coil 200 at the sixth surface S6 of the body 100 and may extend to the first surface S1 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 at the sixth surface S6 of the body 100 and may extend to the first surface S1 and the fifth surface S5 of the body 100. Also, the fourth external electrode 800 may be connected to the second lead-out portion 325 of the second coil 300 at the sixth surface S6 of the body 100 and may extend to the second surface S2 and the fifth surface S5 of the body 100.

[0145] FIG. 9 is a cross-sectional view that illustrates a coil electronic component according to another embodiment.

[0146] 9, a coil electronic component 2000 includes 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.

[0147] The body 1100 can include a first magnetic body 1110 , a second magnetic body 1120 , and a third magnetic body 1130 .

[0148] The first magnetic body 1110 encapsulates the first coil 200 and includes a magnetic material. The first magnetic body 1110 includes a base portion 111, a protruding portion 113, and a supporting portion 115, and the cross section in the length direction (L-axis direction)-thickness direction (T-axis direction) may have an alphabet E shape.

[0149] The second magnetic body 1120 surrounds and seals the second coil 300 and includes a magnetic material. The second magnetic body 1120 includes a base 1111, a protrusion 1113, and a support 1115, and may have an E-shaped cross section in the length direction (L-axis direction) and thickness direction (T-axis direction). That is, the protrusion 1113 is disposed at the center of the base 1111, and the support 1115 spaced apart from the protrusion 1113 is disposed on both side edges of the base 1111. The second magnetic body 1120 has the same shape as or a corresponding shape to the first magnetic body 1110, and therefore a duplicated description thereof will be omitted.

[0150] The third magnetic body 1130 is disposed between the first magnetic body 1110 and the second magnetic body 1120 .

[0151] The third magnetic body 1130 may be in contact with all of the protruding portion 113 and the supporting portion 115 of the first magnetic body 1110, and the first coil 200. A part of the third magnetic body 1130 may be present between the first coil 200 and the protruding portion 113, and a part of the third magnetic body 1130 may be present between the first coil 200 and the supporting portion 115.

[0152] In addition, the third magnetic body 1130 may be in contact with all of the protruding portion 1113 and the supporting portion 1115 of the second magnetic body 1120 and the second coil 300. A part of the third magnetic body 1130 may be present between the second coil 300 and the protruding portion 1113, and a part of the third magnetic body 1130 may be present between the second coil 300 and the supporting portion 1115.

[0153] The remaining components other than those described above are the same as those of the coil electronic component shown in FIG. 1, so a duplicated description thereof will be omitted.

[0154] Specific examples of the present disclosure are presented below. However, the examples described below are merely intended to specifically illustrate or explain the invention, and should not be construed as limiting the scope of the invention. EXAMPLES

[0155] [Manufacturing example: Manufacturing of coil electronic parts] Example 1 A coil electronic component is manufactured in which the thickness of the first coil and the second coil is 200 um, the width of the first coil and the second coil is 40 um, and the aspect ratio is 5:1.

[0156] Example 2 The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 198 um, the width of the first coil and the second coil is 41 um, and the aspect ratio is about 4.83:1.

[0157] Example 3 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 195 um, a width of 41 um, and an aspect ratio of about 4.76:1.

[0158] Example 4 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 193 um, a width of 42 um, and an aspect ratio of about 4.59:1.

[0159] Example 5 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 190 um, a width of 42 um, and an aspect ratio of about 4.52:1.

[0160] Example 6 The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 188 um, the width of the first coil and the second coil is 43 um, and the aspect ratio is about 4.37:1.

[0161] Example 7 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 185 um, a width of 43 um, and an aspect ratio of about 4.3:1.

[0162] Example 8 The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 183 um, the width of the first coil and the second coil is 44 um, and the aspect ratio is about 4.16:1.

[0163] Example 9 The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 180 um, the width of the first coil and the second coil is 44 um, and the aspect ratio is about 4.09:1.

[0164] Example 10 The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 178 um, the width of the first coil and the second coil is 45 um, and the aspect ratio is about 3.96:1.

[0165] Example 11 The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 175 um, the width of the first coil and the second coil is 46 um, and the aspect ratio is about 3.8:1.

[0166] Example 12 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 150 um, a width of 53 um, and an aspect ratio of about 2.83:1.

[0167] (Example 13) The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 125 um, a width of 64 um, and an aspect ratio of about 1.95:1.

[0168] Example 14 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 123 um, a width of 65 um, and an aspect ratio of about 1.89:1.

[0169] Example 15 The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 120 um, the width of the first coil and the second coil is 67 um, and the aspect ratio is about 1.79:1.

[0170] (Example 16) The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 118 um, a width of 68 um, and an aspect ratio of about 1.74:1.

[0171] (Example 17) The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 115 um, a width of 70 um, and an aspect ratio of about 1.64:1.

[0172] (Example 18) The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 113 um, the width of the first coil and the second coil is 71 um, and the aspect ratio is about 1.59:1.

[0173] (Example 19) The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 110 um, a width of 73 um, and an aspect ratio of about 1.5:1.

[0174] (Example 20) The coil electronic component is the same as the first embodiment except that the thickness of the first coil and the second coil is 108 um, the width of the first coil and the second coil is 74 um, and the aspect ratio is about 1.46:1.

[0175] Example 21 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 105 um, a width of 76 um, and an aspect ratio of about 1.38:1.

[0176] Example 22 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 103 um, a width of 78 um, and an aspect ratio of about 1.32:1.

[0177] (Example 23) The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 100 um, a width of 80 um, and an aspect ratio of 1.25:1.

[0178] Comparative Example 1 The coil electronic component is the same as the first embodiment except that the first and second coils have a thickness of 300 um, a width of 27 um, and an aspect ratio of about 11.1:1.

[0179] Comparative Example 2 The coil electronic component is the same as Comparative Example 1 except that the thickness of the first coil and the second coil is 275 um, the width of the first coil and the second coil is 29 um, and the aspect ratio is about 9.48:1.

[0180] Comparative Example 3 The coil electronic component is the same as Comparative Example 1 except that the thickness of the first coil and the second coil of the coil electronic component is 250 um, the width of the first coil and the second coil is 32 um, and the aspect ratio is about 7.81:1.

[0181] Comparative Example 4 The coil electronic component is the same as Comparative Example 1 except that the thickness of the first coil and the second coil of the coil electronic component is 225 um, the width of the first coil and the second coil is 36 um, and the aspect ratio is 6.25:1.

[0182] Comparative Example 5 The coil electronic component is the same as Comparative Example 1 except that the thickness of the first coil and the second coil is 75 um, the width of the first coil and the second coil is 107 um, and the aspect ratio is about 0.7:1.

[0183] Comparative Example 6 The coil electronic component is the same as Comparative Example 1 except that the thickness of the first coil and the second coil of the coil electronic component is 50 um, the width of the first coil and the second coil is 160 um, and the aspect ratio is about 0.31:1.

[0184] [Experimental example: Checking for defective inductance in coil electronic components] After manufacturing 30 coil electronic components each of Examples 1-23 and Comparative Examples 1-6, cross-sectional samples are prepared by polishing the lengthwise (L-axis direction)-thicknesswise (T-axis direction) surfaces to a depth of about 1 / 2 in the widthwise (W-axis direction).

[0185] For the prepared cross-sectional sample, measure the coil width (w) and thickness (t) to calculate the aspect ratio (w:t), measure the core diameter (d), and then check whether the coupling coefficient (k) of the coil electronic components is within the allowable range (greater than 0.1 and less than 0.9). The results are summarized in Table 1. [Table 1] Referring to Table 1, it can be seen that the inductance of the coil electronic components manufactured in Comparative Examples 1-6 was a minus value, so it deviated from the allowable range (more than 0.1 and less than 0.9). In the case of Comparative Examples 1-4, the core diameter was relatively small and the magnetic path area was also small, resulting in a negative coupling coefficient. In the case of Comparative Examples 5-6, the core diameter was relatively large, but the aspect ratio of the coil was very small at 0.7:1 and 0.31:1, respectively, so there was a problem with the coupling coefficient characteristics.

[0186] Meanwhile, it can be confirmed that the inductance of the coil electronic component manufactured in Example 1-23 is within the allowable range (more than 0.1 and less than 0.9).

[0187] Although the embodiment of the present invention has been described above, the present invention is not limited thereto, and can be embodied in various modified forms within the scope of the claims, the description of the invention, and the accompanying drawings, which of course also fall within the scope of the present invention. [Explanation of symbols]

[0188] 1000: Coil electronic components 100:Main body 110: First magnetic material 111: Base 113:Protrusion 115: Support part 117: Recess 120:Second magnetic material 123: Second Core 130:Third magnetic material 200: First coil 210: Winding section 220:Drawer part 223: 1st drawer 225:Second drawer 300: Second coil 310: Winding section 320:Drawer part 323: 1st drawer 325:Second drawer 500: 1st external electrode 600: 2nd external electrode 700: Third external electrode 800: 4th external electrode 900: Insulating layer IF: Insulating film

Claims

1. 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 which is embedded within the first magnetic body; and A second coil, at least a portion of which is embedded inside the second magnetic body. Including, The first magnetic body is an integral structure and includes a base portion, a protruding portion protruding from the base portion, and a support portion protruding from the base portion while being spaced apart from the protruding portion, The first coil is wound around the protruding portion.

2. The coil electronic component according to claim 1 , wherein the main body further includes a third magnetic body disposed between the first magnetic body and the second magnetic body.

3. The coil electronic component according to claim 2 , wherein an outer surface of the third magnetic body and an outer surface of the first magnetic body form an outer surface of the main body.

4. The coil electronic component according to claim 3 , wherein the third magnetic body is at least partially in contact with the second coil and the second magnetic body.

5. The coil electronic component according to claim 4 , wherein the height of the protrusion and the height of the support are different.

6. The coil electronic component according to claim 2 , wherein the third magnetic body is at least partially in contact with the first coil, the protruding portion, and the supporting portion.

7. The coil electronic component according to claim 6 , wherein the first coil is surrounded by the base portion, the protruding portion, the supporting portion, and the third magnetic body.

8. The coil electronic component according to claim 6 , wherein the third magnetic body includes a portion disposed between the first coil and the protruding portion.

9. The coil electronic component according to claim 6 , wherein the third magnetic body includes a portion disposed between the first coil and the support portion.

10. The aspect ratio of the first coil is greater than or equal to 1.25:1 and less than or equal to 5:1; The coil electronic component according to claim 1 or 2, wherein the aspect ratio of the second coil is 1.25:1 or more and 5:1 or less.

11. The coil electronic component according to claim 1 , wherein a coupling coefficient between the first coil and the second coil is equal to or greater than 0.17 and equal to or less than 0.

33.

12. The coil electronic component according to claim 10 , wherein a coupling coefficient between the first coil and the second coil is equal to or greater than 0.17 and equal to or less than 0.

33.

13. a first external electrode disposed outside the body and connected to a first lead portion of the first coil; a second external electrode disposed outside the body and connected to a second lead portion of the first coil; a third external electrode disposed outside the body and connected to the first lead of the second coil; a fourth external electrode disposed outside the body and connected to the second lead of the second coil; The coil electronics of claim 1 further comprising:

14. the first external electrode and the second external electrode 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; 14. The coil electronic component of claim 13, wherein the third external electrode and the fourth external electrode 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.

15. The coil electronics of claim 14 , wherein the first electrode layer and the fourth electrode layer comprise copper.

16. The coil electronic component according to claim 14 , wherein the first electrode layer and the fourth electrode layer are conductive resin layers.

17. The coil electronic component according to claim 13 , further comprising 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.

18. The coil electronic component according to claim 1 , wherein an insulating film is provided on a surface of the first coil and a surface of the second coil.

19. The coil electronic component according to claim 2 , wherein the third magnetic body has a magnetic permeability different from the magnetic permeability of the first magnetic body and the magnetic permeability of the second magnetic body.

20. The coil electronic component according to claim 19 , wherein the third magnetic body is made of a material different from the first magnetic body and the second magnetic body.

21. The coil electronic component according to claim 2 , wherein the first magnetic body, the second magnetic body, and the third magnetic body each include metallic magnetic particles made of a soft magnetic alloy.

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