Coil component

Abstract

The present disclosure provides a coil component including: a body including a first surface and a second surface opposite to each other in a first direction, and a third surface connecting the first surface to the second surface; a coil disposed in the main body and including a lead-out portion led out to the first surface or the second surface; and an external electrode disposed on the main body and connected to the lead-out portion, and including a first metal layer and a second metal layer. The first metal layer includes a first side surface facing the body and a second side surface opposite to the first side surface, and the second metal layer is disposed on each of the first side surface and the second side surface of the first metal layer.

Description

[0001] This application claims the benefit of priority of Korean Patent Application No. 10-2023-0158359 filed in the Korean Intellectual Property Office on November 15, 2023, and Korean Patent Application No. 10-2023-0094559 filed in the Korean Intellectual Property Office on July 20, 2023, the disclosures of which are incorporated herein in their entirety by reference. Technical Field

[0002] The present disclosure relates to a coil assembly. Background Art

[0003] An inductor, a type of coil component, may be a representative passive electronic component used with resistors and capacitors in electronic devices.

[0004] As electronic devices have been designed to have high performance and to be reduced in size, the number of electronic components used in the electronic devices has increased and the sizes of the electronic components have been reduced.

[0005] In addition, a thin film coil assembly in which a coil is plated on a supporting member can be easily miniaturized, but the bonding force between the external electrode and the coil may be reduced. Therefore, a structure with enhanced bonding force is required to maintain the connection reliability between the coil and the external electrode regardless of vibration or impact. Summary of the invention

[0006] An aspect of the present disclosure is a coil component in which connection reliability between a coil and an external electrode in the coil component can be maintained regardless of vibration or external impact.

[0007] An aspect of the present disclosure is to enhance a physical coupling force between a body and an external electrode by bending one region of an end portion of the external electrode toward a recess formed in the body.

[0008] According to one aspect of the present disclosure, a coil component includes: a main body including a first surface and a second surface opposite to each other in a first direction and a third surface connecting the first surface to the second surface; a coil disposed in the main body and including a lead-out portion leading to the first surface or the second surface; and an external electrode disposed on the main body and connected to the lead-out portion, and including a first metal layer and a second metal layer. The first metal layer includes a first side surface facing the main body and a second side surface opposite to the first side surface, and the second metal layer is disposed on each of the first side surface and the second side surface of the first metal layer.

[0009] According to another aspect of the present disclosure, a coil component includes: a main body including a first surface and a second surface opposite to each other in a first direction and a third surface connecting the first surface to the second surface; a coil disposed in the main body and including a lead-out portion leading to the first surface or the second surface; a conductive resin layer disposed on the main body and connected to the lead-out portion; and an external electrode disposed on the conductive resin layer and including a first metal layer and a second metal layer. The first metal layer includes a first side surface facing the main body and a second side surface opposite to the first side surface, the second metal layer is disposed on each of the first side surface and the second side surface of the first metal layer, and the conductive resin layer is disposed between the lead-out portion and the second metal layer, and includes at least a portion extending to the third surface.

[0010] According to another aspect of the present disclosure, a coil component includes: a body including a first surface and a second surface opposite to each other in a first direction and a third surface connecting the first surface to the second surface; a coil disposed in the body and including a lead-out portion extending to the first surface or the second surface; an external electrode disposed on the first surface or the second surface to be connected to the lead-out portion and disposed on the third surface; and an adhesive layer disposed between the third surface of the body and the external electrode. The grains included in the portion of the external electrode disposed on the first surface or the second surface of the body have a long axis arranged parallel to the first surface of the body.

[0011] According to another aspect of the present disclosure, a coil component includes: a body including a first surface and a second surface opposite to each other in a first direction and a third surface and a fourth surface opposite to each other and connected to the first surface and the second surface; a coil provided in the body and including a lead-out portion leading to the first surface or the second surface; an external electrode provided on the first surface or the second surface to be connected to the lead-out portion and provided on the third surface and the fourth surface; and an adhesive layer provided between the third surface of the body and the external electrode. An end of the external electrode is provided in a recess in the fourth surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other aspects, features and advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which: Figure 1 is a perspective view showing a coil component according to a first embodiment of the present disclosure; Figure 2 yes Figure 1 An exploded perspective view of the coil assembly in FIG. Figure 3 is a LT cross-sectional view showing a first external electrode; Figure 4 is along Figure 1 A cross-sectional view taken along line II' in FIG. Figure 5 is a cross-sectional view taken along line II-II' and an enlarged view showing area A; Figure 6 It is shown Figure 5 Magnified images of area B and area C in FIG. Figure 7 is a LT cross-sectional view of a coil component according to a second embodiment of the present disclosure and an enlarged view showing a region D (with Figure 5 correspond); Figure 8 is a diagram showing a LT cross section of a coil component according to a third embodiment of the present disclosure (with Figure 7 correspond); Fig. 9 is a diagram showing a LT cross section of a coil component according to a fourth embodiment of the present disclosure (with Figure 5 correspond); Fig.10 is a diagram showing an LT cross section of a coil component according to a modified example of the fourth embodiment of the present disclosure (with Fig. 9 correspond); Fig.11 is a diagram showing a LT cross section of a coil component according to a fifth embodiment of the present disclosure (with Fig. 9 correspond); Fig.12 is a diagram showing an LT cross section of a coil component according to a modified example of the fifth embodiment of the present disclosure (with Fig.11 corresponding); and Fig.13 and Fig.14 is a diagram showing a part of the process of the method of manufacturing the coil component according to the first embodiment of the present disclosure. DETAILED DESCRIPTION

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0014] However, the present disclosure can be illustrated in many different forms and should not be construed as being limited to the specific embodiments set forth herein. Unless the context has a significantly different meaning, expressions used in the singular include expressions in the plural. The terms "comprise", "include", "constructed to", etc. in the specification are used to indicate the presence of features, quantities, steps, operations, elements, parts, or combinations thereof, and do not exclude the possibility of combining or adding one or more features, quantities, steps, operations, elements, parts, or combinations thereof. In addition, the expression that an element is set "on..." may indicate that the element may be set above or below the target portion, and does not necessarily indicate that the element is set above the target portion in the direction of gravity.

[0015] It will be understood that when an element is “coupled” / “connected” or “coupled to” another element, the element may be directly coupled / directly coupled to the other element, and there may be intervening elements between the element and the other element. In contrast, it will be understood that when an element is “directly coupled” / “directly coupled to” or “directly connected to” another element, there are no intervening elements between the element and the other element.

[0016] For example, structures, shapes, and sizes described as examples in the embodiments of the present disclosure may be implemented in other exemplary embodiments without departing from the spirit and scope of the present disclosure.

[0017] In the drawings, L may be defined as a first direction or a length direction, T may be defined as a second direction or a thickness direction, and W may be defined as a third direction or a width direction.

[0018] In the accompanying drawings, the same elements will be denoted by the same reference numerals. In addition, redundant descriptions and detailed descriptions of known functions and elements that may unnecessarily obscure the subject matter of the present disclosure will not be provided.

[0019] Various electronic components are used in electronic devices, and various coil components may also be appropriately used between these electronic components for the purpose of removing noise.

[0020] That is, in electronic devices, the coil component may be used as a power inductor, a high frequency (HF) inductor, a general magnetic bead, a high frequency (eg, GHz) magnetic bead, a common mode filter, and the like.

[0021] (First embodiment) Figure 1 is a perspective view showing a coil component according to a first embodiment. Figure 2 yes Figure 1 Exploded perspective view of the coil assembly. Figure 3 is a LT cross-sectional view showing the first external electrode. Figure 4 is along Figure 1 A cross-sectional view taken along line II' in FIG. Figure 5 It is a cross-sectional view taken along line II-II' and an enlarged view showing region A. Figure 6 It is shown Figure 5 Magnified images of area B and area C in FIG. Figure 7 is a LT cross-sectional view of the coil component according to the second embodiment and an enlarged view showing a region D (with Figure 5 correspond).

[0022] exist Figure 1 and Figure 2 In the figure, the insulating layer 500 applicable to the first embodiment on the body 100 may not be shown to more clearly show the combination between the components.

[0023] Reference Figures 1 to 6 The coil component 1000 according to the first embodiment may include a body 100 , a coil 300 , and external electrodes 410 and 420 , and may further include a support member 200 , an insulating layer 500 , and adhesive layers 610 and 620 .

[0024] Unlike the structure in which the external electrodes 410 and 420 are formed on the main body 100 by plating, the coil component 1000 according to the first embodiment may have the following structure: the external electrodes 410 and 420 including the first metal layers 411 and 421 and the second metal layers 412 and 422 coating the first metal layers 411 and 421 can be formed separately by a process such as rolling, and can be fused to the lead-out portions 331 and 332 exposed through the main body 100 by ultrasonic welding, laser welding or resistance welding.

[0025] Therefore, in the coil component 1000 in the first embodiment, the external electrodes 410 and 420 can be formed by a process such as rolling so that the major axis direction of the grains included in the first metal layers 411 and 421 of the external electrodes 410 and 420 can be formed to be substantially parallel to the surface of the body 100.

[0026] In addition, the lead portions 331 and 332 and the external electrodes 410 and 420 can be contacted and connected to each other by fusion of ultrasonic welding, laser welding or resistance welding, so that a uniform solid solution can be formed in the area where the lead portions 331 and 332 and the second metal layers 412 and 422 can contact each other.

[0027] Through the above structure, since the bonding force and connection reliability between the coil 300 and the external electrodes 410 and 420 are improved, the coil component 1000 in the first embodiment can have a strong characteristic of resisting vibration or external impact, In the following description, main components included in the coil component 1000 according to the first embodiment will be described in detail.

[0028] The body 100 may form the appearance of the coil component 1000 in the first embodiment, and the coil 300 and the support member 200 may be disposed in the body 100 .

[0029] The body 100 may have a hexahedral shape.

[0030] The body 100 may include a first surface 101 and a second surface 102 opposite to each other in a length direction (L, a first direction), a third surface 103 and a fourth surface 104 opposite to each other in a thickness direction (T, a second direction), and a fifth surface 105 and a sixth surface 106 opposite to each other in a width direction (W, a third direction). Each of the first surface 101, the second surface 102, the fifth surface 105, and the sixth surface 106 of the body 100 may be a wall surface of the body 100 connecting the third surface 103 and the fourth surface 104 of the body 100.

[0031] The body 100 may be formed so that the coil component in which the external electrodes 410 and 420 are formed may have a length of 2.5 mm, a width of 2.0 mm, and a thickness of 0.8 mm, a length of 2.0 mm, a width of 1.2 mm, and a thickness of 1.0 mm, a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.6 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.6 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.4 mm, a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm, a length of 1.0 mm, a width of 0.7 mm, and a thickness of 0.65 mm, a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.65 mm, or a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.5 mm, but embodiments thereof are not limited thereto.

[0032] Since the above exemplary dimensions of the length, width, and thickness of the coil component 1000 may refer to dimensions that do not reflect process errors, dimensions within the range identified as process errors fall within the scope of the present disclosure.

[0033] With respect to an optical microscope image or a scanning electron microscope (SEM) image of a LT cross section in the length direction L-thickness direction T taken from the central portion of the coil component 1000 in the width direction W, the length of the coil component 1000 may be the maximum value of the sizes of the plurality of line segments, which connect the two outermost boundary lines of the coil component 1000 that are opposite to each other in the length direction L and are parallel to the length direction L. Optionally, the length of the coil component 1000 may refer to the minimum value of the sizes of the plurality of line segments. Optionally, the length of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the plurality of line segments. Here, the plurality of line segments parallel to the length direction L may be spaced apart from each other by equal distances in the thickness direction T, but embodiments thereof are not limited thereto.

[0034] With respect to an optical microscope image or a scanning electron microscope (SEM) image of a cross section LT in the length direction L-thickness direction T taken from the central portion of the coil component 1000 in the width direction W, the thickness of the coil component 1000 may be the maximum value of the sizes of the plurality of line segments, which connect the two outermost boundary lines of the coil component 1000 that are opposite to each other in the thickness direction T and are parallel to the thickness direction T. Alternatively, the thickness of the coil component 1000 may refer to the minimum value of the sizes of the plurality of line segments. Alternatively, the thickness of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the plurality of line segments. Here, the plurality of line segments parallel to the thickness direction T may be spaced apart from each other by equal distances in the length direction L, but embodiments thereof are not limited thereto.

[0035] With respect to an optical microscope image or a scanning electron microscope (SEM) image of an LW cross section in the length direction L-width direction W taken from the central portion of the coil component 1000 in the thickness direction T, the width of the coil component 1000 may be the maximum value of the sizes of the plurality of line segments, which connect the two outermost boundary lines of the coil component 1000 that are opposite to each other in the width direction W and are parallel to the width direction W. Alternatively, the width of the coil component 1000 may refer to the minimum value of the sizes of the plurality of line segments. Alternatively, the width of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the plurality of line segments. Here, the plurality of line segments parallel to the width direction W may be spaced apart from each other by equal distances in the length direction L, but embodiments thereof are not limited thereto.

[0036] Optionally, each of the length, width and thickness of the coil component 1000 can be measured by a micrometer measurement method. The micrometer measurement method can be measured with a gauge (Gage) repeatability and reproducibility (R&R) micrometer in the following manner: determine the zero point, insert the coil component 1000 in the embodiment between the tips of the micrometer, and rotate the measuring rod of the micrometer. When measuring the length of the coil component 1000 by the micrometer measurement method, the length of the coil component 1000 may refer to a value measured once, or may refer to an arithmetic mean of values ​​measured multiple times, which can also be applied to the measurement of the width and thickness of the coil component 1000.

[0037] The main body 100 may include a magnetic material and a resin. Specifically, the main body 100 may be formed by laminating one or more magnetic composite sheets in which a magnetic material is dispersed in an insulating resin. The main body 100 may have a structure other than a structure in which a magnetic material is dispersed in a resin. For example, the main body 100 may be formed using a magnetic material such as ferrite.

[0038] The magnetic material can be ferrite or magnetic metal powder.

[0039] The ferrite may be, for example, at least one of spinel ferrite (such as Mg-Zn-based ferrite, Mn-Zn-based ferrite, Mn-Mg-based ferrite, Cu-Zn-based ferrite, Mg-Mn-Sr-based ferrite and Ni-Zn-based ferrite), hexagonal ferrite (such as Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite and Ba-Ni-Co-based ferrite), garnet-type ferrite (such as Y-based ferrite) and Li-based ferrite.

[0040] The magnetic metal powder 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 magnetic metal powder may be at least one of pure iron powder, Fe-Si alloy powder, Fe-Si-Al alloy powder, Fe-Ni alloy powder, Fe-Ni-Mo alloy powder, Fe-Ni-Mo-Cu alloy powder, Fe-Co alloy powder, Fe-Ni-Co alloy powder, Fe-Cr alloy powder, Fe-Cr-Si alloy powder, Fe-Si-Cu-Nb alloy powder, Fe-Ni-Cr alloy powder, and Fe-Cr-Al alloy powder. The magnetic metal powder may have a granular state.

[0041] The magnetic metal powder may be amorphous and / or crystalline. For example, the magnetic metal powder may be Fe-Si-B-Cr amorphous alloy powder, but the embodiment is not limited thereto.

[0042] Each particle of the ferrite and the magnetic metal powder may have an average diameter of about 0.1 µm to about 30 µm, but the embodiment is not limited thereto.

[0043] The body 100 may include two or more types of magnetic materials dispersed in the resin. Here, the different types of magnetic materials may indicate that the magnetic materials dispersed in the resin can be distinguished from each other by at least one of average diameter, composition, crystallinity, and shape.

[0044] The resin may include at least one of epoxy resin, polyimide, and liquid crystal polymer, but the embodiment is not limited thereto.

[0045] The body 100 may include a core 110 passing through the support member 200 and the coil 300. The core 110 may be formed by filling through holes in the support member 200 and the coil 300 with a magnetic composite sheet, but the embodiment is not limited thereto.

[0046] The support member 200 may be provided in the body 100. The support member 200 may be a component that supports the coil 300. In an embodiment, such as when the coil 300 corresponds to a wound coil or has a coreless structure, the support member 200 may not be included.

[0047] The support member 200 may be formed using a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as polyimide, an insulating material including a photosensitive insulating resin, or an insulating material in which a reinforcing material such as glass fiber or an inorganic filler is impregnated in the insulating resin. For example, the support member 200 may be formed using an insulating material such as a prepreg, an Ajinomoto built-up film (ABF), FR-4, a bismaleimide triazine (BT) film, and a photosensitive dielectric (PID) film, but embodiments thereof are not limited thereto.

[0048] As the inorganic filler, 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) can be used.

[0049] When the support member 200 is formed using an insulating material including a reinforcing material, the support member 200 can provide improved rigidity. When the support member 200 is formed using an insulating material not including glass fiber, the support member 200 can be made thicker by reducing the total thickness of the support member 200 and the coil 300 (indicating that the coil 300 and the support member 200 are thicker). Figure 1The thickness of the coil component can be easily reduced by using the sum of the dimensions in the second direction T of the support member 200. When the support member 200 is formed using an insulating material including a photosensitive insulating resin, the number of processes for forming the coil 300 can be reduced, which is beneficial for reducing production costs, and a fine via 320 can be formed. The thickness of the support member 200 can be, for example, greater than or equal to 10µm and less than or equal to 50µm, but embodiments thereof are not limited thereto.

[0050] The coil 300 may be disposed on the support member 200. The coil 300 may be buried in the body 100 and may exhibit characteristics of a coil component. For example, when the coil component 1000 in the first embodiment is used as a power inductor, the coil 300 may store an electric field as a magnetic field to maintain an output voltage, thereby stabilizing the power of the electronic device.

[0051] The coil 300 may be formed on at least one of two surfaces of the support member 200 facing each other and may form at least one turn. In the embodiment, the coil 300 may include coil patterns 311 and 312 , a via 320 , and lead-out portions 331 and 332 .

[0052] Reference Figure 1 , Figure 4 and Figure 5 , the first coil pattern 311 and the second coil pattern 312 may be respectively disposed on the upper and lower surfaces of the support member 200 opposite to each other, and may be in the form of a planar spiral forming at least one turn around the core 110 of the body 100. For example, with respect to Figure 1 The first coil pattern 311 may be disposed on the upper surface of the support member 200 and may form at least one turn around the core 110. The second coil pattern 312 may be disposed on the lower surface of the support member 200 and may form at least one turn around the core 110. The first coil pattern 311 and the second coil pattern 312 may be formed so that ends of the outermost turns connected to the lead-out portions 331 and 332 may extend in the directions of the first surface 101 and the second surface 102 of the body 100, respectively.

[0053] The lead-out portions 331 and 332 may extend from the coil patterns 311 and 312 to the first surface 101 or the second surface 102 of the body 100 .

[0054] Specifically, the first lead-out portion 331 may extend from an outer end of the first coil pattern 311 to the first surface 101 of the body 100 and may be connected to the first external electrode 410. In addition, the first lead-out portion 331 may be integrally formed with the first coil pattern 311.

[0055] Similarly, the second lead-out portion 332 may extend from the outer end of the second coil pattern 312 to the second surface 102 of the body 100 and may be connected to the second external electrode 420. In addition, the second lead-out portion 332 may be integrally formed with the second coil pattern 312.

[0056] Reference Figure 4 , the coil 300 may further include a via 320 connecting the first coil pattern 311 to the second coil pattern 312. Specifically, the via 320 may connect the inner end of the innermost turn of the first coil pattern 311 and the inner end of the innermost turn of the second coil pattern 312 to each other through the support member 200. Therefore, the signal input to the first external electrode 410 may be output to the second external electrode 420 through the first lead-out portion 331, the first coil pattern 311, the via 320, the second coil pattern 312, and the second lead-out portion 332. With this structure, all components of the coil 300 may be used as a single coil connected between the first external electrode 410 and the second external electrode 420.

[0057] At least one of the coil patterns 311 and 312 , the via 320 , and the lead-out portions 331 and 332 may include at least one conductive layer.

[0058] As an example, when the upper surface (relative to the upper surface of the support member 200) Figure 1 When the first coil pattern 311, the via 320 and the first lead-out portion 331 are formed by plating in a direction (in a direction of the first coil pattern 311), each of the first coil pattern 311, the via 320 and the first lead-out portion 331 may include a seed layer and a plating layer (e.g., an electroplating layer). The seed layer may be formed by electroless plating or a vapor deposition method (such as sputtering). Each of the seed layer and the plating layer may have a single-layer structure or a multi-layer structure. The plating layer having a multi-layer structure may be formed as a conformal film structure in which one plating layer is covered by another plating layer, or may be formed into a shape in which another plating layer is only stacked on one surface of one plating layer. The seed layer of the first coil pattern 311, the seed layer of the via 320 and the seed layer of the first lead-out portion 331 may be formed integrally, and no boundary may be formed between them, but the embodiment thereof is not limited thereto. The plating layer of the first coil pattern 311, the plating layer of the via 320 and the plating layer of the first lead-out portion 331 may be formed integrally, and no boundary may be formed between them, but the embodiment thereof is not limited thereto.

[0059] Each of the coil patterns 311 and 312 , the via 320 , and the lead-out portions 331 and 332 may include a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo), or alloys thereof, but is not limited thereto.

[0060] Reference Figure 1 , Figure 2 and Figure 5 , the coil component 1000 according to the first embodiment may include external electrodes 410 and 420 disposed on the body 100 and connected to the coil 300 .

[0061] The external electrodes 410 and 420 may be components that electrically connect the coil component 1000 to the circuit substrate when the coil component 1000 according to the first embodiment is mounted on the circuit substrate. For example, the connection portions of the first and second external electrodes 410 and 420 spaced apart from each other on the third surface 103 of the body 100 and the circuit substrate may be electrically connected to each other.

[0062] Specifically, the first external electrode 410 may be disposed on the first surface 101 of the main body 100 and may contact and be connected to the first lead-out portion 331 extending to the first surface 101 of the main body 100, and the second external electrode 420 may be disposed on the second surface 102 of the main body 100 and may contact and be connected to the second lead-out portion 332 extending to the second surface 102 of the main body 100.

[0063] The first external electrode 410 may be disposed on the first surface 101 of the body 100 , and may extend to at least a portion of the third to sixth surfaces 103 , 104 , 105 , and 106 of the body 100 .

[0064] The second external electrode 420 may be disposed on the second surface 102 of the body 100 , and may extend to at least a portion of the third to sixth surfaces 103 , 104 , 105 , and 106 of the body 100 .

[0065] A portion of the first external electrode 410 extending to at least a portion of the third to sixth surfaces 103 , 104 , 105 , and 106 of the body 100 and a portion of the second external electrode 420 extending to at least a portion of the third to sixth surfaces 103 , 104 , 105 , and 106 of the body 100 may be spaced apart from each other.

[0066] Reference Figure 1 , Figure 2 and Figure 5 According to the first embodiment, the coil component 1000 may have a first external electrode 410 and a second external electrode 420 respectively disposed on the first surface 101 and the second surface 102 of the body 100, and the first external electrode 410 and the second external electrode 420 may have a structure extending only to the third surface 103 of the body 100.

[0067] In this case, the first external electrode 410 may include a first pad portion disposed on the third surface 103 of the body 100 and a first extension portion disposed on the first surface 101 of the body 100 and connecting the first lead-out portion 331 to the first pad portion.

[0068] In addition, the second external electrode 420 may include a second pad portion spaced apart from the first pad portion on the third surface 103 of the body 100 , and a second extension portion disposed on the second surface 102 of the body 100 and connecting the second lead-out portion 332 to the second pad portion.

[0069] The pad portion and the extension portion may be formed together in the same process, and may be integrated with each other without a boundary therebetween.

[0070] Reference Figure 3 and Figure 5 , the external electrodes 410 and 420 according to the first embodiment may include first metal layers 411 and 421 and second metal layers 412 and 422 .

[0071] The first metal layers 411 and 421 of the external electrodes 410 and 420 may include an inner surface opposite to the body 100 and an outer surface opposite to the inner surface, and the second metal layers 412 and 422 of the external electrodes 410 and 420 may be respectively disposed on the inner and outer surfaces of the first metal layers 411 and 421. That is, the second metal layers 412 and 422, the first metal layers 411 and 421, and the second metal layers 412 and 422 may be sequentially disposed on the external electrodes 410 and 420 from the inner side relative to the outer side of the coil component 1000. The second metal layers 412 and 422 may cover the ends of the first metal layers 411 and 421.

[0072] The first metal layers 411 and 421 of the external electrodes 410 and 420 may be coated with the second metal layers 412 and 422. That is, with respect to the LT cross section of the coil component 1000 in the first embodiment, the second metal layers 412 and 422 of the external electrodes 410 and 420 may be disposed to surround the first metal layers 411 and 421. However, embodiments thereof are not limited thereto, and the second metal layers 412 and 422 may be disposed to expose partial regions of the first metal layers 411 and 421 on both ends of the external electrodes 410 and 420.

[0073] The first metal layers 411 and 421 of the external electrodes 410 and 420 may include copper (Cu), and the second metal layers 412 and 422 may include nickel (Ni). For example, the external electrodes 410 and 420 in the first embodiment may be equivalent to the form of nickel (Ni) coated on the surface of copper (Cu).

[0074] Reference Figure 5 The second metal layers 412 and 422 of the external electrodes 410 and 420 may directly contact the lead-out portions 331 and 332 on the first surface 101 or the second surface 102 of the body 100 and may be fused together by a process such as ultrasonic welding, laser welding, or resistance welding.

[0075] Therefore, the metal included in the lead-out portions 331 and 332 and the metal included in the second metal layers 412 and 422 may form a uniform solid solution in the region where they contact each other. Here, the uniform solid solution may be a solid solution in which the crystal structure does not change due to forming a single composition regardless of the ratio in which the two materials are mixed.

[0076] Figure 5 The enlarged view of area A in FIG. 4 shows in detail the contact area between the second lead portion 332 and the second external electrode 420 , and a uniform solid solution area CS1 may be formed in the area where the metal included in the second lead portion 332 and the metal included in the second metal layer 422 of the second external electrode 420 contact each other.

[0077] In the solid solution region CS1 where a uniform solid solution is formed, there may be a point where the content ratio (e.g., weight ratio) between the metal included in the second lead-out portion 332 and the metal included in the second metal layer 422 is 1:1, which may be a feature presented due to a gradual change in the contents of the two metals in the uniform solid solution region CS1, which is different from an intermetallic compound (IMC).

[0078] For example, in the case where the second lead portion 332 includes copper (Cu) and the second metal layer 422 includes nickel (Ni), when the second lead portion 332 and the second external electrode 420 are fused by a process such as ultrasonic welding, laser welding, or resistance welding, the copper (Cu) in the second lead portion 332 and the nickel (Ni) in the second metal layer 422 may form a uniform solid solution. In the uniform solid solution region CS1, the nickel (Ni) content may gradually increase from the second lead portion 332 to the second metal layer 422, and the copper (Cu) content may gradually decrease, and in the middle region, there may be a point where the content ratio between copper (Cu) and nickel (Ni) is 1:1.

[0079] Figure 6 It is shown Figure 5 FIG. 4 is an enlarged view of a region B included in the second lead-out portion 332 and a region C included in the first metal layer 421 in a region A of FIG.

[0080] Reference Figure 6 , metal grains G1 and G2 can be observed in the enlarged views of region B and region C, respectively. For example, in region B, grains G1 of copper (Cu) included in the second lead-out portion 332 can be observed, and in region C, grains G2 of copper (Cu) included in the first metal layer 421 can be observed.

[0081] When comparing the enlarged view showing region B with the enlarged view showing region C, a size of a grain G2 of copper (Cu) included in the first metal layer 421 may be greater than a size of a grain G1 of copper (Cu) included in the second lead-out portion 332 , and the grain G2 may have directionality.

[0082] The lead-out portions 331 and 332 as components of the coil 300 may be formed on the support member 200 by electroplating, and the first metal layer 421 of the external electrodes 410 and 420 may be formed by a rolling process including pressurization and heating using a roller, so that the size of the grains G2 may increase and may have directionality due to recrystallization.

[0083] Here, the sizes of the grains G1 and G2 may be determined by, for example, a line intercept method, but embodiments are not limited thereto.

[0084] Reference Figure 5 and Figure 6 , the long axis La direction of the crystal grains G2 included in the first metal layer 421 may be arranged parallel to the surface of the body 100. That is, in the region where the first metal layer 421 is disposed on the second surface 102 of the body 100, the long axis La direction of the crystal grains G2 may be arranged parallel to the second direction T, and in the region where the first metal layer 421 is disposed on the third surface 103 of the body 100, the long axis La direction of the crystal grains G2 may be arranged parallel to the first direction L.

[0085] Here, the concept that the long axis La of the grain G2 included in the first metal layer 421 is arranged basically parallel to the second direction T may mean that, relative to an imaginary extension line VL passing through the body 100 and parallel to the first direction L, the internal angle θ formed between the long axis La of the grain G2 included in the first metal layer 421 and the imaginary extension line VL may be defined as 80 degrees or greater and 110 degrees or less, but it is not limited thereto.

[0086] Similarly, the concept that the long axis La of the grain G2 included in the first metal layer 421 is arranged basically parallel to the first direction L can be expressed that, relative to an imaginary extension line passing through the body 100 and parallel to the second direction T, the internal angle θ formed between the long axis La of the grain G2 included in the first metal layer 421 and the extension line can be defined as 80 degrees or greater and 110 degrees or less, but it is not limited to this.

[0087] In this case, the major axis La of the grain G2 included in the first metal layer 421 may refer to an axis having a maximum length of the grain G2 and may be observed on an optical microscope image or a scanning electron microscope (SEM) image of an LT cross section taken from a central portion of the coil component 1000 in the third direction.

[0088] The internal angle θ between the imaginary extension line VL perpendicular to the surface of the body 100 and the major axis La of the grain G2 may refer to an arithmetic mean value obtained by measuring the angle between the major axis La and the imaginary extension line VL for each grain G2 appearing in an area of ​​20 μm×20 μm or more in the SEM image.

[0089] The external electrodes 410 and 420 may be formed by coating the second metal layers 412 and 422 on the surfaces of the first metal layers 411 and 421 and performing a rolling process using a roller, but embodiments thereof are not limited thereto, and the first metal layers 411 and 421 may be first formed by a rolling process, and the second metal layers 412 and 422 may be formed on the surfaces of the first metal layers 411 and 421 by a vapor deposition method such as sputtering and / or a plating method.

[0090] The external electrodes 410 and 420 formed by the above method may be disposed on the body 100, and may be in contact with the lead portions 331 and 332 and connected to the lead portions 331 and 332 by ultrasonic welding, laser welding, or resistance welding. In at least a portion of the contact area between the external electrodes 410 and 420 and the lead portions 331 and 332, a uniform solid solution may be formed between the metal included in the lead portions 331 and 332 and the metal included in the second metal layers 412 and 422 of the external electrodes 410 and 420.

[0091] Therefore, compared with forming the external electrodes 410 and 420 by plating, the bonding force and connection reliability between the external electrodes 410 and 420 and the lead-out portions 331 and 332 may be improved.

[0092] The coil component 1000 according to the first embodiment may further include an insulating layer 500 disposed on the third to sixth surfaces 103, 104, 105, and 106 of the body 100. The insulating layer 500 may be disposed in a region of the surface of the body 100 except for a region where the external electrodes 410 and 420 are disposed.

[0093] At least a portion of the insulating layer 500 disposed on the third to sixth surfaces 103 , 104 , 105 , and 106 of the body 100 may be formed by the same process and may be integrated with each other without a boundary therebetween, but the embodiment is not limited thereto.

[0094] Reference Figure 5 , at least a portion of the insulating layer 500 may extend to a region between the third surface 103 of the body 100 and the external electrodes 410 and 420 .

[0095] When the insulating layer 500 extends to the area between the third surface 103 of the body 100 and the external electrodes 410 and 420, the insulation distance between the first external electrode 410 and the second external electrode 420 can be increased, so that current leakage that may occur between the first external electrode 410 and the second external electrode 420 can be effectively prevented.

[0096] When the coil component 1000 according to the first embodiment includes adhesive layers 610 and 620 to be described later, the insulating layer 500 may extend to a region between the third surface 103 of the body 100 and the adhesive layers 610 and 620. The adhesive layers 610 and 620 may extend from the third surface 103 to cover at least a portion of the first surface 101 or at least a portion of the second surface 102.

[0097] When the insulating layer 500 extends to the area between the third surface 103 of the main body 100 and the adhesive layers 610 and 620, the effect of preventing current leakage that may occur between the first external electrode 410 and the second external electrode 420 can be increased, and the bonding force between the insulating layer 500 and the adhesive layers 610 and 620 can be enhanced, so that the bonding force between the external electrodes 410 and 420 and the main body 100 can also be enhanced.

[0098] The insulating layer 500 may be formed by methods such as printing, vapor deposition, spraying, and film lamination, but embodiments thereof are not limited thereto.

[0099] The insulating layer 500 may also include thermoplastic resins (such as polystyrene resins, vinyl acetate resins, polyester resins, polyethylene resins, polypropylene resins, polyamide resins, rubber resins, and acrylic resins), thermosetting resins (such as phenolic resins, epoxy resins, polyurethane resins, melamine resins, alkyd resins, etc.), and photosensitive resins, polyparaxylene, SiO x or SiN x The insulating layer 500 may further include an insulating filler such as an inorganic filler, but the embodiment is not limited thereto.

[0100] Reference Figure 1 , Figure 2 and Figure 5 The coil component 1000 according to the first embodiment may further include adhesive layers 610 and 620 disposed between the third surface 103 of the body 100 and the external electrodes 410 and 420. The adhesive layers 610 and 620 may be components for enhancing the bonding force between the body 100 and the external electrodes 410 and 420.

[0101] Specifically, the first adhesive layer 610 may be disposed between the third surface 103 of the body 100 and the first external electrode 410 , and the second adhesive layer 620 may be disposed between the third surface 103 of the body 100 and the second external electrode 420 .

[0102] The adhesive layers 610 and 620 in the first embodiment may include a conductive resin or a non-conductive resin. As an example, the adhesive layers 610 and 620 may include a conductive paste. In addition, the adhesive layers 610 and 620 may include one or more of epoxy resin, polyurethane, silicone resin, polyimide, phenol, and polyester thermosetting resin, but the embodiment is not limited thereto.

[0103] Reference Figure 4 and Figure 5 , the insulating film IF may be provided between the coil 300 and the body 100 to cover the coil 300. The insulating film IF may be formed along the surfaces of the support member 200 and the coil 300. The insulating film IF may insulate the coil 300 from the body 100, and may include a known insulating material such as polyparaxylene, but embodiments thereof are not limited thereto. The insulating film IF may be formed by a method such as vapor deposition, but embodiments thereof are not limited thereto, and the insulating film IF may be formed by laminating insulating films on both surfaces of the support member 200.

[0104] (Second embodiment) Figure 7 is a LT cross-sectional view of the coil component according to the second embodiment and an enlarged view showing a region D (with Figure 5 correspond).

[0105] When the general Figure 7 and Figure 5 When compared, the coil component 2000 according to the second embodiment may differ in a configuration in which the third metal layers 430 and 440 are further interposed between the body 100 and the second metal layers 412 and 422 , and a formation position of the uniform solid solution region CS2 is determined by the configuration.

[0106] Therefore, when describing the second embodiment, only the formation positions of the third metal layers 430 and 440 and the uniform solid solution region CS2 which are different from the first embodiment will be described, and the description in the first embodiment can be applied to other components in the second embodiment.

[0107] Reference Figure 7 The coil component 2000 according to the embodiment may further include third metal layers 430 and 440 disposed between the lead-out portions 331 and 332 and the second metal layers 412 and 422 .

[0108] The third metal layers 430 and 440 may be disposed to cover the first surface 101 or the second surface 102 of the body 100 .

[0109] The third metal layers 430 and 440 may be formed by electroplating and may include a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo), or alloys thereof, but are not limited thereto.

[0110] The third metal layers 430 and 440 in the second embodiment may include the same metal as that of the lead-out portions 331 and 332 , and thus, the connection reliability and physical bonding force between the lead-out portions 331 and 332 and the external electrodes 410 and 420 may be further enhanced.

[0111] Reference Figure 7 , the metal included in the third metal layers 430 and 440 and the metal included in the second metal layers 412 and 422 may form a uniform solid solution in a region contacting each other.

[0112] That is, unlike the first embodiment, the uniform solid solution region CS2 may be formed between the third metal layers 430 and 440 and the second metal layers 412 and 422 , that is, may be formed in the third metal layers 430 and 440 and the second metal layers 412 and 422 .

[0113] For example, referring to the enlarged view showing region D, a uniform solid solution region CS2 may be formed in at least a portion of a region where the third metal layer 440 and the second metal layer 422 contact each other.

[0114] In the solid solution region CS2 where a uniform solid solution is formed, there may be a point where the content ratio between the metal included in the third metal layer 440 and the metal included in the second metal layer 422 is 1:1, which may be a feature presented in the uniform solid solution region CS2 due to a gradual change in the content of the two metals, which is different from an intermetallic compound (IMC).

[0115] For example, in the case where the third metal layer 440 includes copper (Cu) and the second metal layer 422 includes nickel (Ni), when the third metal layer 440 and the second external electrode 420 are fused by a process such as ultrasonic welding, laser welding, or resistance welding, the copper (Cu) of the third metal layer 440 and the nickel (Ni) of the second metal layer 422 may form a uniform solid solution. In the uniform solid solution region CS2, the copper (Cu) content may gradually decrease and the nickel (Ni) content may gradually increase from the third metal layer 440 to the second metal layer 422, and in the middle region, there may be a point where the content ratio between copper (Cu) and nickel (Ni) is 1:1.

[0116] In the coil component 2000 in the second embodiment, the third metal layers 430 and 440 corresponding to the pre-plating layers can be first arranged on the surfaces of the exposed lead-out portions 331 and 332 of the main body 100, that is, on the first surface 101 and the second surface 102, and then, the separately formed external electrodes 410 and 420 can be fused to the third metal layers 430 and 440 by ultrasonic welding, laser welding or resistance welding, so that the area of ​​the fused surface can be increased, and the connection reliability and bonding force between the coil 300 and the external electrodes 410 and 420 can be further enhanced.

[0117] (Third embodiment) Figure 8 is a diagram showing a LT cross section of a coil component according to a third embodiment (with Figure 7 correspond).

[0118] When the general Figure 8 and Figure 7 When compared, the coil component 3000 according to the third embodiment is different from the second embodiment in a configuration in which recesses R1 and R2 are formed in a body 100 and a configuration in which external electrodes 410 and 420 include bent portions BP1 and BP2 extending to the recesses R1 and R2 .

[0119] Therefore, when describing the third embodiment, only the recesses R1 , R2 and the bent portions BP1 and BP2 extending to the recesses R1 and R2 that are different from the second embodiment will be described, and the description of the second embodiment can be applied to other components in the third embodiment.

[0120] Reference Figure 8 , the upper surface (ie, the fourth surface 104) of the body 100 may include at least one recess R1 and R2. The recesses R1 and R2 in the third embodiment may be formed in the body 100, and may further generate a physical fixing force between the body 100 and the external electrodes 410 and 420 by accommodating a portion of the external electrodes 410 and 420.

[0121] A portion of the external electrodes 410 and 420 may extend into the recesses R1 and R2. In addition, the recesses R1 and R2 may be spaced apart from the first and second surfaces 101 and 102 of the body 100, respectively. In addition, the recesses R1 and R2 may extend to the fifth and sixth surfaces 105 and 106 of the body 100.

[0122] Specifically, in the third embodiment, the first recess R1 and the second recess R2 may be formed on the fourth surface 104 of the body 100, and the first recess R1 may be spaced apart from the first surface 101 of the body 100 by a predetermined distance, and may accommodate and fix at least a portion of the end of the first external electrode 410. For example, the at least a portion of the first external electrode 410 disposed in the first recess R1 in the fourth surface 104 may include a portion spaced apart from and extending across a wall surface of the first recess R1, and the wall surface of the first recess R1 is closer to the first surface 101 than a portion spaced apart from the wall surface of the first recess R1. Similarly, the second recess R2 may be spaced apart from the second surface 102 of the body 100 by a predetermined distance, and may accommodate and fix at least a portion of the end of the second external electrode 420. For example, the at least a portion of the second external electrode 420 in the second recess R2 disposed in the fourth surface 104 may include a portion that is spaced apart from and extends across a wall surface of the second recess R2, and the wall surface of the second recess R2 is closer to the second surface 102 than the portion that is spaced apart from the wall surface of the second recess R2.

[0123] Reference Figure 8 , the external electrodes 410 and 420 in the third embodiment may include bent portions BP1 and BP2 formed at one end, and the bent portions BP1 and BP2 may be bent toward the recessed portions R1 and R2.

[0124] Specifically, the first external electrode 410 may be disposed on the first surface 101 of the body 100, and the first external electrode 410 may extend to the fourth surface 104 of the body 100 along an area where the first surface 101 of the body 100 and the first recess R1 are spaced apart from each other, and an extended end of the first external electrode 410 may include a first bent portion BP1 that is bent to be accommodated in the first recess R1.

[0125] Similarly, the second external electrode 420 may be disposed on the second surface 102 of the body 100, and the second external electrode 420 may extend to the fourth surface 104 of the body 100 along a region where the second surface 102 of the body 100 and the second recess R2 are spaced apart from each other. The extended end of the second external electrode 420 may include a second bent portion BP2 that is bent to be accommodated in the second recess R2.

[0126] The angle at which the bent portions BP1 and BP2 are bent may be selected without limitation within a range greater than 0 degrees and less than 180 degrees as long as a physical fixing force can be provided between the bent portions BP1 and BP2 and the recessed portions R1 and R2 at the angle.

[0127] In the coil component 3000 according to the third embodiment, recesses R1 and R2 may be formed on the body 100, and since the bends BP1 and BP2 formed at the ends of the external electrodes 410 and 420 are accommodated in the recesses R1 and R2, additional physical fixing force may be provided between the body 100 and the external electrodes 410 and 420, so that resistance to external shock or vibration may be enhanced.

[0128] (Fourth Embodiment and Modifications) Fig. 9 is a diagram showing a LT cross section of a coil component according to a fourth embodiment (with Figure 5 correspond).

[0129] When the general Fig. 9 and Figure 5 In comparison, unlike the first embodiment, in the coil component 4000 according to the fourth embodiment, the adhesive layers 610 and 620 arranged on the third surface 103 of the main body 100 are not provided, and the first conductive resin layers 711 and 721 having an L shape are inserted between the second metal layers 412 and 422 and the main body 100.

[0130] Therefore, when describing the fourth embodiment, only the first conductive resin layers 711 and 721 having an L shape which are different from the first embodiment will be described, and the description in the first embodiment can be applied to other components in the fourth embodiment.

[0131] Reference Fig. 9 The coil component 4000 according to the fourth embodiment may further include first conductive resin layers 711 and 721 disposed between the external electrodes 410 and 420 and the body 100. In the fourth embodiment, the functions of the adhesive layers 610 and 620 in the first embodiment may also be replaced by the first conductive resin layers 711 and 721, so that the adhesive layers 610 and 620 may not be disposed.

[0132] The first conductive resin layers 711 and 721 of the fourth embodiment may be disposed on the body 100 and may be connected to the lead-out portions 331 and 332. In addition, the first conductive resin layers 711 and 721 may connect the lead-out portions 331 and 332 to the external electrodes 410 and 420.

[0133] In addition, the first conductive resin layers 711 and 721 may be disposed between the lead-out portions 331 and 332 and the second metal layers 412 and 422 of the external electrodes 410 and 420 , and at least a portion of the first conductive resin layers 711 and 721 may extend to the third surface 103 of the body 100 .

[0134] The first conductive resin layers 711 and 721 in the fourth embodiment may be formed as a layer including a resin and a metal component dispersed in the resin. The resin may be a thermosetting resin, for example, may include an epoxy resin. The metal component may include a silver (Ag) or copper (Cu) component. As an example, in the fourth embodiment, the first conductive resin layers 711 and 721 may be an Ag epoxy resin layer or a Cu epoxy resin layer, but the embodiment is not limited thereto.

[0135] The first conductive resin layers 711 and 721 may include a metal component and current may flow, and the first conductive resin layers 711 and 721 may include a resin component having flexibility and elasticity, so that the first conductive resin layers 711 and 721 may have stronger characteristics against vibration or external impact than metal layers.

[0136] In addition, in the coil component 4000 according to the fourth embodiment, the first conductive resin layers 711 and 721 can be directly set on the body 100, and the bonding force and flexibility between the body 100 and the external electrodes 410 and 420 can be enhanced by the bonding between the resin component of the body 100 and the resin component of the first conductive resin layers 711 and 721.

[0137] Fig.10 is a diagram showing an LT cross section of a coil component according to a modified example of the fourth embodiment (with Fig. 9 correspond).

[0138] When the general Fig.10 and Fig. 9 In comparison, unlike the fourth embodiment, the modified example further includes second conductive resin layers 712 and 722 provided between the first conductive resin layers 711 and 721 and the second metal layers 412 and 422 .

[0139] Therefore, when describing the modified example, only the second conductive resin layers 712 and 722 that are different from the fourth embodiment will be described, and the description in the fourth embodiment can be applied to other components in the modified example.

[0140] Reference Fig.10 , the coil component 4000 ′ according to the modified example may include a plurality of conductive resin layers extending to the third surface 103 of the body 100 .

[0141] Specifically, the first conductive resin layers 711 and 721 may be disposed on the first surface 101 of the body 100, and a portion of the first conductive resin layers 711 and 721 may extend to the third surface 103. The second conductive resin layers 712 and 722 may be further disposed on the extensions of the first conductive resin layers 711 and 721 disposed on the third surface 103.

[0142] The second conductive resin layers 712 and 722 in the modified example may be formed using a layer including a resin and a metal component dispersed in the resin. The resin may be a thermosetting resin, for example, may include an epoxy resin. The metal component may include a silver (Ag) or copper (Cu) component. As an example, in the modified example, the second conductive resin layers 712 and 722 may be an Ag epoxy resin layer or a Cu epoxy resin layer, but the embodiment is not limited thereto.

[0143] The external electrodes 410 and 420 of the coil component 4000' according to the modified example can be mounted on a circuit substrate, and a conductive resin layer having a double-layer structure of first conductive resin layers 711 and 721 and second conductive resin layers 712 and 722 can be disposed in a pad portion (a portion where stress is concentrated), so that a bonding force between the body 100 and the external electrodes 410 and 420 can be enhanced.

[0144] In addition, due to the flexibility and elasticity of the resin component of the conductive resin layer, the conductive resin layer becomes strong against vibration and external impact, and by providing the second conductive resin layers 712 and 722 only on the pad region, the DC resistance (R dc ) characteristics may not be degraded.

[0145] (Fifth Embodiment and Modifications) Fig.11 is a diagram showing a LT cross section of a coil component according to a fifth embodiment (with Fig. 9 correspond).

[0146] When the general Fig.11 and Fig. 9 When compared, the coil component 5000 according to the fifth embodiment is different from the fourth embodiment in that recesses R1 and R2 are formed in the body 100 and that the external electrodes 410 and 420 include bent portions BP1 and BP2 extending into the recesses R1 and R2.

[0147] Therefore, when describing the fifth embodiment, only the recesses R1 and R2 and the bent portions BP1 and BP2 extending to the recesses R1 and R2 that are different from the fourth embodiment will be described, and the description of the fourth embodiment can be applied to other components in the fifth embodiment.

[0148] Reference Fig.11 , the upper surface (ie, the fourth surface 104) of the body 100 may include at least one recess R1 and R2. The recesses R1 and R2 in the fifth embodiment may be formed in the body 100, and may further generate a physical fixing force between the body 100 and the external electrodes 410 and 420 by accommodating a portion of the external electrodes 410 and 420.

[0149] A portion of the external electrodes 410 and 420 may extend into the recesses R1 and R2. In addition, the recesses R1 and R2 may be spaced apart from the first and second surfaces 101 and 102 of the body 100, respectively. In addition, the recesses R1 and R2 may extend to the fifth and sixth surfaces 105 and 106 of the body 100.

[0150] Specifically, in the fifth embodiment, the first recess R1 and the second recess R2 may be formed on the fourth surface 104 of the body 100, the first recess R1 may be spaced apart from the first surface 101 of the body 100 by a predetermined distance, and may receive and fix at least a portion of the end of the first external electrode 410. Similarly, the second recess R2 may be spaced apart from the second surface 102 of the body 100 by a predetermined distance, and may receive and fix at least a portion of the end of the second external electrode 420.

[0151] Reference Fig.11 , the external electrodes 410 and 420 of the fifth embodiment may include bent portions BP1 and BP2 formed at one end, and the bent portions BP1 and BP2 may be bent toward the recessed portions R1 and R2.

[0152] Specifically, the first external electrode 410 may be disposed on the first surface 101 of the body 100, and the first external electrode 410 may extend to the fourth surface 104 of the body 100 along an area where the first surface 101 of the body 100 and the first recess R1 are spaced apart from each other, and an extended end of the first external electrode 410 may include a first bent portion BP1 that is bent to be accommodated in the first recess R1.

[0153] Similarly, the second external electrode 420 may be disposed on the second surface 102 of the body 100 and may extend to the fourth surface 104 of the body 100 along a region where the second surface 102 and the second recess R2 are spaced apart from each other. The extended end of the second external electrode 420 may include a second bent portion BP2 bent to be accommodated in the second recess R2.

[0154] The angle at which the bent portions BP1 and BP2 are bent may be selected without limitation within a range greater than 0 degrees and less than 180 degrees as long as a physical fixing force can be provided between the bent portions BP1 and BP2 and the recessed portions R1 and R2 at the angle.

[0155] In the coil component 5000 according to the fifth embodiment, recesses R1 and R2 may be formed on the body 100, and when the bends BP1 and BP2 formed on the ends of the external electrodes 410 and 420 are accommodated in the recesses R1 and R2, additional physical fixing force may be provided between the body 100 and the external electrodes 410 and 420, thereby obtaining characteristics of resisting external shocks or vibrations.

[0156] In addition, the coil component 5000 according to the fifth embodiment may include first conductive resin layers 711 and 721 between the external electrodes 410 and 420 and the body 100, so that due to the flexibility and elasticity of the resin components of the first conductive resin layers 711 and 721, strong resistance to vibration and external impact can be obtained.

[0157] In other words, the coil component 5000 in the fifth embodiment can be mounted on a circuit substrate, and even when the coil component 5000 is exposed to an environment generating vibration or external shock, due to the flexibility and elasticity of the first conductive resin layers 711 and 721 and the physical fixation of the recesses R1 and R2 and the bends BP1 and BP2, the bonding force between the body 100 and the external electrodes 410 and 420 or the connection reliability between the coil 300 and the external electrodes 410 and 420 can be further enhanced.

[0158] Fig.12 is a diagram showing a LT cross section of a coil component according to a modified example of the fifth embodiment (with Fig.11 correspond).

[0159] When the general Fig.12 and Fig.11 When compared, the modified example is different from the fifth embodiment in that the modified example further includes second conductive resin layers 712 and 722 provided between the first conductive resin layers 711 and 721 and the second metal layers 412 and 422 .

[0160] Therefore, when describing the modified example, only the second conductive resin layers 712 and 722 that are different from the fifth embodiment will be described, and the description in the fifth embodiment can be applied to other components in the modified example.

[0161] Reference Fig.12 , the coil component 5000 ′ according to the modified example may include a plurality of conductive resin layers extending to the third surface 103 of the body 100 .

[0162] Specifically, the first conductive resin layers 711 and 721 may be disposed on the first surface 101 of the body 100 , a portion of the first conductive resin layers 711 and 721 may extend to the third surface 103 , and the second conductive resin layers 712 and 722 may be further disposed on the region where the first conductive resin layers 711 and 721 extend to the third surface 103 .

[0163] The second conductive resin layers 712 and 722 in the modified example may be formed using a layer including a resin and a metal component dispersed in the resin. The resin may be a thermosetting resin, for example, may include an epoxy resin. The metal component may include a silver (Ag) or copper (Cu) component. As an example, in the modified example, the second conductive resin layers 712 and 722 may be an Ag epoxy resin layer or a Cu epoxy resin layer, but the embodiment is not limited thereto.

[0164] The external electrodes 410 and 420 of the coil component 5000' according to the modified example can be mounted on a circuit substrate, and a conductive resin layer having a double-layer structure of first conductive resin layers 711 and 721 and second conductive resin layers 712 and 722 can be disposed in a pad portion (a portion where stress is concentrated), so that a bonding force between the body 100 and the external electrodes 410 and 420 can be enhanced.

[0165] In addition, due to the flexibility and elasticity of the resin component of the conductive resin layer, the conductive resin layer becomes strong against vibration and external impact, and by providing the second conductive resin layers 712 and 722 only on the pad region, the DC resistance (R dc ) characteristics may not be degraded.

[0166] Process for manufacturing coil assembly Fig.13 and Fig.14 is a diagram showing a part of the process of the method of manufacturing the coil component according to the first embodiment.

[0167] Reference Fig.13 , the external electrodes 410 and 420 connected to the electrode frame EF may be formed by a rolling process using a roller. Here, the external electrodes 410 and 420 may be formed by coating a second metal layer on a surface of a first metal layer and performing a rolling process using a roller, but the embodiment is not limited thereto, and the external electrodes 410 and 420 may be formed by first forming a first metal layer by a rolling process and forming the second metal layer on the surface of the first metal layer by vapor deposition such as sputtering and / or plating.

[0168] Subsequently, adhesive layers 610 and 620 may be disposed on pad regions of the external electrodes 410 and 420 connected to the electrode frame EF, and the body 100 including the coil 300 embedded therein may be loaded.

[0169] Here, a conductive resin layer may be provided instead of the adhesive layers 610 and 620. When the conductive resin layer is provided, the conductive resin layer is not limited to be provided in the pad region, and may be extended and provided to a region contacting the lead-out portion of the coil 300.

[0170] Then, refer to Fig.14In order to form the individual coil components 1000 , the outer electrodes 410 and 420 connected to the electrode frame EF may be cut using a finishing member TM.

[0171] Subsequently, regarding portions of the external electrodes 410 and 420 not disposed on the body 100 , ie, regions except the pads, the external electrodes 410 and 420 may be bent and in close contact with the side surface of the body 100 by applying upward pressure using the bending member BM.

[0172] Subsequently, the lead-out portion of the coil 300 exposed to the side surface of the body 100 may be fused with the external electrodes 410 and 420 using ultrasonic welding, laser welding, or resistance welding.

[0173] According to the above-described embodiments, the connection reliability between the coil and the external electrode in the coil component can be maintained regardless of vibration or external impact.

[0174] According to another aspect, by including a structure in which one region on an end portion of the external electrode is bent toward a recess formed in the body, a physical coupling force between the body and the external electrode may be enhanced.

[0175] While embodiments have been shown and described above, it will be readily apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: a body including a first surface and a second surface opposite to each other in a first direction and a third surface connecting the first surface to the second surface; a coil disposed in the body and including a lead-out portion led out to the first surface or the second surface; as well as an external electrode, disposed on the main body and connected to the lead-out portion, and comprising a first metal layer and a second metal layer, wherein the first metal layer includes a first side surface facing the main body and a second side surface opposite to the first side surface, and Wherein, the second metal layer is disposed on each of the first side surface and the second side surface of the first metal layer.

2. The coil assembly according to claim 1, wherein: The first metal layer is coated by the second metal layer.

3. The coil assembly according to claim 1, wherein: The second metal layer surrounds the first metal layer in a cross section perpendicular to the first surface and the third surface.

4. The coil assembly according to claim 1, wherein: The first metal layer includes copper.

5. The coil assembly according to claim 1, wherein: The second metal layer includes nickel.

6. The coil assembly according to claim 1, wherein: The metal included in the lead-out portion and the metal included in the second metal layer form a uniform solid solution in a region in contact with each other.

7. The coil assembly according to claim 6, wherein: In the region having the uniform solid solution, there is a point where the content ratio between the metal included in the lead-out portion and the metal included in the second metal layer is 1:

1.

8. The coil assembly according to claim 1, wherein: The long axis directions of the crystal grains included in the first metal layer are arranged substantially parallel to the surface of the body.

9. The coil assembly according to claim 1, wherein: With respect to an imaginary extension line passing through the body and parallel to the first direction, an interior angle formed by the major axis of the grain included in the first metal layer and the imaginary extension line is 80 degrees or more and 110 degrees or less.

10. The coil assembly according to claim 1, wherein: Crystal grains included in the first metal layer disposed on one of the first to third surfaces of the body have long axes aligned parallel to the one of the first to third surfaces of the body.

11. The coil assembly according to claim 1, further comprising: A supporting member is provided in the body and supports the coil.

12. The coil assembly according to claim 1, further comprising: an insulating layer, disposed on the third surface of the main body, Wherein, at least a portion of the insulating layer extends to a region between the third surface of the body and the external electrode.

13. The coil assembly according to claim 1, further comprising: The third metal layer is arranged between the lead-out portion and the second metal layer.

14. The coil assembly according to claim 13, wherein: The third metal layer covers the first surface or the second surface.

15. The coil assembly according to claim 13, wherein: The third metal layer includes copper.

16. The coil assembly according to claim 13, wherein: The metal included in the third metal layer and the metal included in the second metal layer have a uniform solid solution in a region contacting each other.

17. The coil assembly according to claim 16, wherein: In the region having the uniform solid solution, there is a point where the content ratio between the metal included in the third metal layer and the metal included in the second metal layer is 1:

1.

18. The coil assembly according to claim 13, in, The body further includes a fourth surface opposite to the third surface, wherein the fourth surface comprises at least one recess, and Wherein, a portion of the external electrode extends to the recess.

19. The coil assembly according to claim 18, wherein: The recess is spaced apart from each of the first surface and the second surface.

20. The coil assembly according to claim 18, wherein One end of the external electrode includes a bent portion, and the bent portion is bent toward the recessed portion.

21. The coil assembly according to claim 18, further comprising: An adhesive layer is disposed between the third surface of the body and the external electrode.

22. The coil assembly according to claim 21, wherein The adhesive layer includes a conductive layer.

23. The coil assembly according to claim 13, further comprising: An adhesive layer is disposed between the third surface of the body and the external electrode.

24. The coil assembly according to claim 23, wherein: The adhesive layer includes a conductive layer.

25. The coil assembly of claim 1, further comprising: An adhesive layer is disposed between the third surface of the body and the external electrode.

26. The coil assembly according to claim 25, wherein: The adhesive layer includes a conductive layer.

27. A coil assembly comprising: a body including a first surface and a second surface opposite to each other in a first direction and a third surface connecting the first surface to the second surface; a coil disposed in the body and including a lead-out portion led out to the first surface or the second surface; a conductive resin layer disposed on the main body and connected to the lead-out portion; as well as an external electrode disposed on the conductive resin layer and comprising a first metal layer and a second metal layer, wherein the first metal layer includes a first side surface facing the main body and a second side surface opposite to the first side surface, wherein the second metal layer is disposed on each of the first side surface and the second side surface of the first metal layer, and The conductive resin layer is disposed between the lead-out portion and the second metal layer, and includes at least a portion extending to the third surface.

28. The coil assembly according to claim 27, wherein: The coil component includes a plurality of conductive resin layers extending to the third surface.

29. The coil assembly according to claim 27, wherein: The conductive resin layer includes at least one of silver and copper.

30. The coil assembly according to claim 27, wherein: The first metal layer includes copper, and the second metal layer includes nickel.

31. The coil assembly according to claim 27, wherein: The long axis directions of the crystal grains included in the first metal layer are arranged substantially parallel to the surface of the body.

32. The coil assembly of claim 27, wherein: With respect to an imaginary extension line passing through the body and parallel to the first direction, an internal angle formed by the major axis of the grain included in the first metal layer and the imaginary extension line is 80 degrees or more and 110 degrees or less.

33. The coil assembly according to claim 27, in, The body includes at least one recess, and One end of the external electrode is bent along the surface of the body and inserted into the recess.

34. The coil assembly according to claim 27, wherein: Crystal grains included in the first metal layer disposed on one of the first to third surfaces of the body have long axes aligned parallel to the one of the first to third surfaces of the body.

35. A coil assembly comprising: a body including a first surface and a second surface opposite to each other in a first direction and a third surface connecting the first surface to the second surface; a coil disposed in the body and including a lead-out portion led out to the first surface or the second surface; an external electrode disposed on the first surface or the second surface to be connected to the lead-out portion and disposed on the third surface; as well as an adhesive layer disposed between the third surface of the body and the external electrode, The crystal grains included in a portion of the external electrode disposed on the first surface or the second surface of the body have long axes arranged parallel to the first surface of the body.

36. The coil assembly according to claim 35, wherein Relative to an imaginary extension line passing through the body and parallel to the first direction, an internal angle formed by the long axis of the grain included in the portion of the external electrode arranged on the first surface or the second surface of the body and the imaginary extension line is 80 degrees or more and 110 degrees or less.

37. The coil assembly of claim 35, wherein: The grains are copper grains.

38. The coil assembly of claim 37, wherein: The external electrode also includes nickel.

39. The coil assembly of claim 38, wherein: The metal included in the external electrode and the metal included in the lead-out portion form a uniform solid solution of nickel and copper in a region contacting each other.

40. The coil assembly of claim 35, wherein: The adhesive layer extends from the third surface to cover at least a portion of the first surface.

41. The coil assembly according to claim 40, wherein The adhesive layer is a conductive resin layer.

42. The coil assembly according to claim 41, wherein The conductive resin layer includes a silver epoxy layer or a copper epoxy layer.

43. A coil assembly comprising: A body including a first surface and a second surface opposite to each other in a first direction and a third surface and a fourth surface opposite to each other and connected to the first surface and the second surface; a coil disposed in the body and including a lead-out portion led out to the first surface or the second surface; an external electrode disposed on the first surface or the second surface to be connected to the lead-out portion, and disposed on the third surface and the fourth surface; as well as an adhesive layer disposed between the third surface of the body and the external electrode, Wherein, the end of the external electrode is arranged in the recess in the fourth surface.

44. The coil assembly according to claim 43, wherein Of the third surface and the fourth surface, the recessed portion is provided only in the fourth surface.

45. The coil assembly of claim 44, wherein: The end portion of the external electrode disposed in the recess in the fourth surface includes a portion that is spaced apart from and extends across a wall surface of the recess, and The wall surface of the recessed portion is closer to the first surface than a portion of the end portion spaced apart from the wall surface of the recessed portion.

46. ​​The coil assembly of claim 43, wherein: The adhesive layer extends from the third surface to cover at least a portion of the first surface.

47. The coil assembly of claim 46, wherein: The adhesive layer is spaced apart from the recess.

48. The coil assembly of claim 46, wherein: The adhesive layer is a conductive resin layer.

49. The coil assembly of claim 48, wherein: The conductive resin layer includes a silver epoxy layer or a copper epoxy layer.

50. The coil assembly of claim 47, wherein: The external electrode includes copper and nickel.

51. The coil assembly of claim 50, wherein: The metal included in the lead-out portion and the metal included in the external electrode form a uniform solid solution of nickel and copper in a region contacting each other.

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