Coil component

Abstract

The present disclosure provides a coil component including a body having a first surface, a second surface opposite the first surface, and one or more side surfaces connecting the first surface and the second surface to each other. A first coil and a second coil disposed inside the body each include an upper coil layer and a lower coil layer, respectively, the first coil including a first core, and the second coil including a second core. The upper coil layer of the second coil is disposed between the upper coil layer and the lower coil layer of the first coil. And the lower coil layer of the first coil is arranged between the upper coil layer and the lower coil layer of the second coil. The first core includes a first common core overlapping the second core and a first non-common core not overlapping the second core, and the second core includes the second common core overlapping the first core and a second non-common core not overlapping the first core.

Description

[0001] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0146313 filed on October 30, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. Technical Field

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

[0003] According to the miniaturization and slimming of electronic devices such as digital televisions (TVs), mobile phones, and laptop computers, miniaturization and slimming of coil components used in such electronic devices have been required. In order to meet such requirements, research and development of various winding type coil components or film type coil components have been actively carried out.

[0004] In addition, in a coupled inductor (which has the advantage of reducing the installation area of ​​the coil component), two or more coils may be arranged in a vertical direction or a horizontal direction based on the installation surface of the component. In a coupled inductor in which two or more coils are arranged in a vertical direction, when the coils are arranged to be separated into an upper coil and a lower coil, the characteristic deviation between the coils may increase, which may have a negative impact on the component characteristics. Summary of the invention

[0005] An aspect of the present disclosure may enable effective control of characteristic deviations between coils through an arrangement structure of coils.

[0006] According to one aspect of the present disclosure, a coil component includes: a main body having a first surface, a second surface opposite to the first surface in a first direction, and one or more side surfaces connecting the first surface and the second surface to each other; and a first coil and a second coil, which are arranged inside the main body and each includes an upper coil layer and a lower coil layer, respectively, the first coil includes a first core, and the second coil includes a second core, wherein the upper coil layer of the second coil is arranged between the upper coil layer of the first coil and the lower coil layer of the first coil, the lower coil layer of the first coil is arranged between the upper coil layer of the second coil and the lower coil layer of the second coil, the first core includes a first common core stacked with the second core and a first non-common core not stacked with the second core, and the second core includes a second common core stacked with the first core and a second non-common core not stacked with the first core.

[0007] According to another aspect of the present disclosure, a coil component includes: a main body having a first surface, a second surface opposite to the first surface in a first direction, and one or more side surfaces connecting the first surface and the second surface to each other; a support member arranged inside the main body; and an upper coil layer and a lower coil layer, respectively arranged on both sides of the support member, wherein the upper coil layer includes a first upper coil layer and a second upper coil layer, the lower coil layer includes a first lower coil layer connected to the first upper coil layer and a second lower coil layer connected to the second upper coil layer, the first upper coil layer forms a first core, and the second upper coil layer forms a second core, the first core includes a first common core stacked with the second core and a first non-common core not stacked with the second core, and the second core includes a second common core stacked with the first core and a second non-common core not stacked with the first core. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] 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:

[0009] Figure 1 is a schematic perspective view showing a coil component according to a first exemplary embodiment of the present disclosure;

[0010] Figure 2 It is shown Figure 1 An exploded perspective view of a coil connection structure of a coil assembly;

[0011] Figure 3 yes Figure 1 A plan view of the coil assembly when viewed from above;

[0012] Figure 4 yes Figure 1 A plan view of the coil when viewed layer by layer from above;

[0013] Figure 5 It is along Figure 1 A cross-sectional view taken along line II';

[0014] Figure 6 It is along Figure 1 A cross-sectional view taken along line II-II';

[0015] Figure 7 is a schematic perspective view showing a coil component according to a second exemplary embodiment of the present disclosure;

[0016] Figure 8 It is shown Figure 7 An exploded perspective view of a coil connection structure of a coil assembly;

[0017] Fig. 9 yes Figure 7 A plan view of the coil assembly when viewed from above;

[0018] Fig.10 yes Figure 7 A plan view of the coil when viewed layer by layer from above;

[0019] Fig.11 It is along Figure 7 A cross-sectional view taken along line III-III';

[0020] Fig.12 It is along Figure 7 A cross-sectional view taken along line IV-IV';

[0021] Fig.13 is a schematic perspective view showing a coil component according to a comparative example; and

[0022] Fig.14 yes Fig.13 A plan view of the coil assembly when viewed from above. DETAILED DESCRIPTION

[0023] The terms used in this specification are only for describing specific exemplary embodiments and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, a singular form is intended to include a plural form.

[0024] It should be understood that the terms "include" or "have" used herein specify the presence of the features, quantities, steps, operations, components, parts or combinations thereof mentioned in the specification, but do not exclude the presence or addition of one or more other features, quantities, steps, operations, components, parts or combinations thereof.

[0025] In addition, throughout the specification, “on” does not necessarily mean that any element is positioned on the upper side based on the gravity direction, but means that any element is positioned above or below the target portion.

[0026] Furthermore, in a connection relationship of two components, the term “coupled” refers not only to a situation where the two components are in direct physical contact with each other but also to a situation where the two components are in contact with another component with the other component interposed therebetween.

[0027] As used herein, the expression "substantially parallel" may refer to two or more surfaces that lie on non-intersecting imaginary planes as will be understood by those skilled in the art, and allows for approximations, imprecisions, and limitations of measurement in relevant circumstances. In one or more aspects, the terms "substantially," "about," and "approximately" may provide industry-accepted tolerances for their corresponding terms and / or relativity between items, such as ±1%, ±5%, or ±10% of the actual value, as well as other suitable tolerances.

[0028] Since the dimensions (e.g., thickness) of the various components shown in the drawings are arbitrarily shown for convenience of explanation, the present disclosure is not necessarily limited to those shown in the drawings. In the drawings, the X direction refers to the first direction or thickness direction, the Y direction refers to the second direction or width direction, and the Z direction refers to the third direction or length direction.

[0029] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The exemplary embodiments of the present disclosure may be modified in many different forms, and the scope of the present disclosure should not be limited to the exemplary embodiments set forth herein. More specifically, exemplary embodiments are provided to fully convey the concept of the present disclosure to those of ordinary skill in the art. In the accompanying drawings, shapes and sizes may be exaggerated for clarity, and the same reference numerals will always be used to refer to the same or similar components.

[0030] Various electronic components can be used in electronic devices, and various coil components can be appropriately used between these electronic components according to their uses to remove noise, etc. That is, the coil components used in electronic devices can be power inductors, high frequency (HF) inductors, ordinary magnetic beads, magnetic beads for high frequencies (for example, magnetic beads for GHz bands), common mode filters, etc.

[0031] First Exemplary Embodiment

[0032] Will refer to Figures 1 to 6 A coil component 1000 according to a first exemplary embodiment in the present disclosure is described.

[0033] Figure 1 is a schematic perspective view showing a coil component according to a first exemplary embodiment in the present disclosure. Figure 2 It is shown Figure 1 An exploded perspective view of the coil connection structure of the coil assembly. Figure 3 yes Figure 1 A plan view of the coil assembly when viewed from above. Figure 4 yes Figure 1 A plan view of the coil when viewed layer by layer from above. Figure 5 It is along Figure 1 A cross-sectional view taken along line II'. Figure 6 It is along Figure 1 A cross-sectional view taken along line II-II′.

[0034] Reference Figures 1 to 6 According to the first exemplary embodiment of the present disclosure, the coil component 1000 may include a body 100, a support member 200, a first coil 300 and a second coil 400, and may also include a first external electrode 531, a second external electrode 532, a third external electrode 541, a fourth external electrode 542, an insulating layer 600 and an insulating film IF.

[0035] The body 100 may form an appearance of the coil component 1000 according to the first exemplary embodiment in the present disclosure, and may have the support member 200 and the coils 300 and 400 embedded therein.

[0036] The main body 100 may have a first surface 101 and a second surface 102 opposite to each other in a first direction (X direction) and a plurality of side surfaces (third surface 103 to sixth surface 106) connecting the first surface and the second surface to each other. Specifically, the third surface 103 and the fourth surface 104 opposite to each other in the second direction (Y direction) connect the first surface 101 and the second surface 102, and the fifth surface 105 and the sixth surface 106 opposite to each other in the third direction (Z direction) connect the first surface 101 and the second surface 102. Here, the first direction (X direction), the second direction (Y direction) and the third direction (Z direction) may be perpendicular to each other. The first direction (X direction) may correspond to the thickness direction of the main body 100. In the following description, the first direction (X direction), the second direction (Y direction) and the third direction (Z direction) each represent two directions. For example, the first direction (X direction) includes both the upward direction and the downward direction in the accompanying drawings. In the following, for ease of explanation, the expressions "up" and "down" are used. This is for ease of explanation of the relative arrangement between components, and “upper” and “lower” do not necessarily refer to the upper side and the lower side in the gravity direction.

[0037] The main body 100 may include a resin and a magnetic material. Specifically, the main body 100 may be formed by stacking one or more magnetic composite sheets (in which the magnetic material is dispersed in the resin). The magnetic material may be a ferrite or a magnetic metal powder. The ferrite may be, for example, a spinel ferrite (such as Mg-Zn-based ferrite, Mn-Zn-based ferrite, Mn-Mg-based ferrite, Cu-Zn-based ferrite, Mg-Mn-Sr-based ferrite or Ni-Zn-based ferrite), a hexagonal ferrite (such as Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite or Ba-Ni-Co-based ferrite), a garnet ferrite (such as Y-based ferrite) and at least one of Li-based ferrite. The magnetic metal powder may include one or more selected from the group consisting of iron (Fe), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu) and nickel (Ni). In addition, the magnetic metal powder may also include silicon (Si). For example, the magnetic metal powder may be pure iron powder, Fe-Si-based alloy powder, Fe-Si-Al-based alloy powder, Fe-Ni-based alloy powder, Fe-Ni-Mo-based alloy powder, Fe-Ni-Mo-Cu-based alloy powder, Fe-Co-based alloy powder, Fe-Ni-Co-based alloy powder, Fe-Cr-based alloy powder, Fe-Cr-Si-based alloy powder, Fe-Si-Cu-Nb-based alloy powder, Fe-Ni-Cr-based alloy powder and Fe-Cr-Al-based alloy powder. The magnetic metal powder may be amorphous or crystalline. For example, the magnetic metal powder may be a Fe-Si-B-Cr-based amorphous alloy powder, but is not necessarily limited thereto. Both ferrite and magnetic metal powder may have an average diameter of about 0.1 μm to 30 μm, but is not limited thereto. The body 100 may include two or more magnetic materials dispersed in a resin. Here, different kinds of magnetic materials refer to magnetic materials dispersed in the resin being distinguished from each other by any one of average diameter, composition, crystallinity, and shape. The resin may include epoxy resin, polyimide, liquid crystal polymer (LCP), or a mixture thereof, etc., but is not limited thereto.

[0038] As an example of a manufacturing method, the main body 100 can be formed by a stacking method. Specifically, a plurality of unit stacks for manufacturing the main body 100 can be prepared and stacked on the coils 300 and 400 and under the coils 300 and 400. The unit stack can be manufactured into a sheet by mixing magnetic metal particles, thermosetting resins, and organic materials (such as adhesives and solvents) with each other to prepare a slurry, applying the slurry to a thickness of tens of microns on a carrier film by, for example, a doctor blade method, and then drying the slurry. Therefore, the unit stack can be manufactured in a form in which magnetic particles are dispersed in a thermosetting resin such as an epoxy resin or a thermoplastic resin such as a polyimide resin.

[0039] In addition, the body 100 may include cores 130 and 140 that penetrate the support member 200 and the coils 300 and 400 described below. The core may be formed by filling a through hole that penetrates the center of the support member 200 and the coils 300 and 400 with a magnetic composite sheet containing a magnetic material. Therefore, the first core 130 may be formed in the first coil 300 and the second core 140 may be formed in the second coil 400, which will be described in detail in the following description of the coils.

[0040] The support member 200 may be disposed inside the body 100 and support the coils 300 and 400. However, according to some exemplary embodiments, the support member 200 may not be provided. For example, in the case of using a winding type coil, the support member 200 may not be provided. The coil component 1000 according to the first exemplary embodiment may relate to a thin film inductor in which electroplating is performed on the support member 200.

[0041] During trimming for forming the cores 130 and 140 , a central portion of the support member 200 may be removed to form the through hole H. As shown in FIG.

[0042] The supporting member 200 may have a surface ( Figure 2 The upper surface of the main body 100 and the other surface ( Figure 2 the lower surface in the middle).

[0043] In addition, the support member 200 may be formed using an insulating material including a thermosetting insulating resin (such as an epoxy resin), a thermoplastic insulating resin (such as a polyimide resin), or a photosensitive insulating resin, or may be formed using an insulating material formed by impregnating a reinforcing material (such as glass fiber or an inorganic filler) in such an insulating resin. As an 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) resin, or a photosensitive dielectric (PID) film, but is not limited thereto. One or more materials 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 as the material of the inorganic filler. In the case where the support member 200 is formed using an insulating material including a reinforcing material, the support member 200 can provide more excellent rigidity. In the case where the support member 200 is formed using an insulating material that does not contain glass fiber, the support member 200 can be conducive to reducing the thickness of the coil component 1000 according to the present exemplary embodiment, and on the basis of the main body 100 having substantially the same size, the volume occupied by the coils 300 and 400 and / or the magnetic metal powder can be increased, so that the component characteristics can be improved. When the support member 200 is formed of an insulating material including a photosensitive insulating resin, the number of processes for forming the coils 300 and 400 can be reduced, which can be beneficial for reducing production costs and forming fine vias. The thickness of the support member 200 can be, for example, greater than or equal to 10 μm and less than or equal to 50 μm, but is not limited thereto.

[0044] Will refer to Figure 2 Describe the coil connection structure.

[0045] The coil component 1000 according to the present exemplary embodiment may include a first coil 300 and a second coil 400. That is, the coil component according to the present exemplary embodiment may be an array type coil component, and specifically may be a coupled inductor. However, the coil component according to the present exemplary embodiment is not necessarily limited thereto.

[0046] As described below, the first coil 300 and the second coil 400 may be spaced apart from each other in the first direction (X direction). Specifically, the first coil 300 and the second coil 400 may each have an upper coil layer and a lower coil layer alternately arranged in the first direction (X direction). The first coil 300 may not be physically connected to the second coil 400. That is, the coil assembly 1000 according to this exemplary embodiment may be a coil array in which the coils are arranged in a vertical direction.

[0047] Will refer to Figure 2 , Figure 4 , Figure 5 , Figure 6 The first coil 300 is described.

[0048] The first coil 300 may include an upper coil layer 310 and a lower coil layer 320 spaced apart from each other in a first direction (X direction). Figure 2 In the embodiment of the present invention, the upper coil layer 310 is arranged on the upper side, and the lower coil layer 320 is arranged on the lower side. For convenience, the upper coil layer 310 of the first coil 300 may be referred to as the first upper coil layer 310. For convenience, the lower coil layer 320 of the first coil 300 may be referred to as the first lower coil layer 320. As described above, the expressions "upper" and "lower" are used for convenience of description. This is to facilitate the description of the relative arrangement between components, and "upper" and "lower" do not necessarily refer to the upper side and the lower side in the direction of gravity.

[0049] The first upper coil layer 310 may be disposed on one surface of the support member 200 ( Figure 2 ), and the first lower coil layer 320 may be disposed on another surface ( Figure 2 on the lower surface of the ).

[0050] The upper coil layer 310 and the lower coil layer 320 of the first coil 300 may form at least one turn.

[0051] Reference Figure 1 and Figure 6 , one end of the first upper coil layer 310 may extend to the third surface 103 of the body 100 , and the other end of the first upper coil layer 310 may be connected to the first lower coil layer 320 .

[0052] One end of the first lower coil layer 320 may extend to the third surface 103 of the body 100 , and the other end of the first lower coil layer 320 may be connected to the first upper coil layer 310 .

[0053] The second upper coil layer 410 (described below) may be disposed between the first upper coil layer 310 and the first lower coil layer 320 , but the first upper coil layer 310 and the first lower coil layer 320 are not connected (eg, electrically connected) to the second upper coil layer 410 .

[0054] The first via hole V1 may connect the other end of the first upper coil layer 310 and the corresponding other end of the first lower coil layer 320. A first external electrode 531 and a second external electrode 532 described below may be disposed on the third surface 103 of the body 100 and may be respectively connected to one end of the first upper coil layer 310 and one end of the first lower coil layer 320. As a result, the first coil 300 may be used as a single coil.

[0055] Reference Figure 4 , the first upper coil layer 310 may have a first straight portion L1 and a second straight portion L2, the first straight portion L1 being adjacent to and substantially parallel to the third surface 103 of the body 100, and the second straight portion L2 being adjacent to and substantially parallel to the fourth surface 104 of the body 100. Here, the straight portion may refer to an outermost coil portion having a curvature of substantially 0. That is, since the straight portion is substantially parallel to the third surface 103 and the fourth surface 104, the curvature of the straight portion may be substantially 0.

[0056] The length of the first straight portion L1 may be greater than the length of the second straight portion L2. The length of the first straight portion L1 of the first upper coil layer 310 may be greater than the length of the second straight portion L2, so that when viewed from the first direction (X direction), the core 130 may have a tapered shape (for example, a shape tapered in the second direction (Y direction)), but the shape of the core 130 is not necessarily limited thereto.

[0057] The first straight portion L1 may be disposed closer to the sixth surface 106 of the body 100 than the second straight portion L2. Therefore, as described below, the first common core 131 may be disposed closer to the fifth surface 105 of the body 100 than the first non-common core 132.

[0058] Will refer to Figure 2 , Figure 4 , Figure 5 , Figure 6 The second coil 400 is described.

[0059] The second coil 400 may include an upper coil layer 410 and a lower coil layer 420 along the first direction (X direction). Figure 2 , the upper coil layer 410 is disposed on the upper side, and the lower coil layer 420 is disposed on the lower side. For convenience, the upper coil layer 410 of the second coil 400 may be referred to as the second upper coil layer 410. For convenience, the lower coil layer 420 of the second coil 400 may be referred to as the second lower coil layer 420.

[0060] The second upper coil layer 410 may be disposed on one surface of the support member 200 ( Figure 2 ), and the second lower coil layer 420 may be disposed on another surface ( Figure 2on the lower surface of the ).

[0061] Hereinafter, the arrangement of the coil layers, which is one of the characteristic configurations of the present disclosure, will be described in detail. The second coil 400 may be disposed inside the body 100 without contacting the first coil 300. The coil layers of the first coil 300 and the coil layers of the second coil 400 may be arranged alternately. In some embodiments, the upper coil layer 410 of the second coil 400 may be disposed between the upper coil layer 310 of the first coil 300 and the lower coil layer 320 of the first coil 300, and the lower coil layer 320 of the first coil 300 may be disposed between the upper coil layer 410 of the second coil 400 and the lower coil layer 420 of the second coil 400. Reference Figure 2 and Figure 5 , it can be seen that the first upper coil layer 310 , the second upper coil layer 410 , the first lower coil layer 320 , and the second lower coil layer 420 are arranged in this order.

[0062] Figure 13 to Figure 14 is a diagram showing a coil component according to a comparative example. Fig.13 is a schematic perspective view showing a coil component according to a comparative example. Fig.14 yes Fig.13 A plan view of the coil assembly when viewed from above.

[0063] In the coil assembly according to the comparative example, the first coil and the second coil are formed on one surface and the other surface of the support member, respectively. Therefore, the coil positioned on the lower side is arranged close to the mounting surface of the coil assembly. The coil close to the mounting surface of the coil assembly has a problem that the magnetic flux and capacity are reduced due to the influence of the pad pattern of the mounting surface or the metal layer of the substrate. In addition, compared with the coil positioned on the lower side, for the coil positioned on the upper side, the path through which the signal flows is longer, so the resistance is higher.

[0064] That is, in the case where the coil is arranged to be separated into an upper coil and a lower coil as in the comparative example, characteristic deviation between the coils may easily occur in the coupled inductor.

[0065] In the coil component 1000 according to the present disclosure, the first coil 300 and the second coil 400 are alternately arranged in the first direction (X direction) to solve the above-mentioned problem. Since the coil layers of the first coil 300 and the coil layers of the second coil 400 are alternately arranged, the deviation of the capacity and resistance characteristics can be reduced. Table 1 below is a table comparing the characteristics (Rdc and Ls) of the coil component according to the comparative example and the coil component according to the first exemplary embodiment.

[0066]

[0067] Table 1

[0068] Referring to Table 1, it can be seen that in the comparative example, the difference (ratio) of Rdc and Ls between the first coil and the second coil is 3.68% and 3.00%, respectively, and in the first exemplary embodiment, the difference (ratio) of Rdc and Ls between the first coil and the second coil is 1.78% and 0.67%, respectively. That is, it can be confirmed that the characteristic deviation between the first coil 300 and the second coil 400 of the coil component according to the exemplary embodiment in the present disclosure is reduced compared with the comparative example.

[0069] The upper coil layer 410 and the lower coil layer 420 of the second coil 400 may form at least one turn.

[0070] Reference Figure 1 and Figure 6 , one end of the second upper coil layer 410 may extend to the fourth surface 104 of the body 100 , and the other end of the second upper coil layer 410 may be connected to the second lower coil layer 420 .

[0071] One end of the second lower coil layer 420 may extend to the fourth surface 104 of the body 100 , and the other end of the second lower coil layer 420 may be connected to the second upper coil layer 410 .

[0072] The first lower coil layer 320 may be disposed between the second upper coil layer 410 and the second lower coil layer 420 , but the second upper coil layer 410 and the second lower coil layer 420 are not electrically connected to the lower coil layer 320 .

[0073] The second via hole V2 may connect the other end of the second upper coil layer 410 and the other end of the second lower coil layer 420. A third external electrode 541 and a fourth external electrode 542 described below may be disposed on the fourth surface 104 of the body 100 and may be respectively connected to one end of the second upper coil layer 410 and one end of the second lower coil layer 420. As a result, the second coil 400 may be used as a single coil.

[0074] Reference Figure 4 , the second upper coil layer 410 may have a third straight portion L3 and a fourth straight portion L4, the third straight portion L3 being adjacent to and substantially parallel to the third surface 103 of the body 100, and the fourth straight portion L4 being adjacent to and substantially parallel to the fourth surface 104 of the body 100. Here, the straight portion may refer to an outermost coil portion having a curvature of substantially 0. That is, since the straight portion is substantially parallel to the third surface 103 and the fourth surface 104, the curvature of the straight portion may be substantially 0.

[0075] The length of the fourth straight portion L4 may be greater than the length of the third straight portion L3. The length of the fourth straight portion L4 of the second upper coil layer 410 being greater than the length of the third straight portion L3 may result in the core 140 having a tapered shape (e.g., a tapered shape in the second direction (Y direction)) when viewed from the first direction (X direction), but the shape of the core 140 is not necessarily limited thereto.

[0076] The fourth straight portion L4 may be disposed closer to the sixth surface 106 of the body 100 than the third straight portion L3. Therefore, as described below, the second common core 141 may be disposed closer to the fifth surface 105 of the body 100 than the second non-common core 142.

[0077] The coils 300 and 400 and the vias V1 and V2 may be formed by a plating method used in the prior art (such as a pattern plating method, an anisotropic plating method, or an isotropic plating method), and may also be formed to have a multilayer structure by using a variety of these methods. In addition, examples of materials of the coils 300 and 400 and the vias V1 and V2 include conductive materials (such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), and alloys thereof), but are not limited thereto.

[0078] In the case where the coil layers 310, 320, 410 and 420 are formed by plating, each coil layer may include a seed layer and an electroplating layer. The seed layer may be formed by a vapor deposition method such as an electroless plating method or a sputtering method. Each of the seed layer and the electroplating layer may have a single-layer structure or a multi-layer structure. The electroplating layer having a multi-layer structure may be formed into a conformal film structure in which any one electroplating layer is covered by another electroplating layer, or may be formed into a shape having another electroplating layer only stacked on one surface of any one electroplating layer. The seed layer of the coil layer and the seed layer of the via may be formed integrally, and may not form a boundary between them, but the seed layer is not limited thereto. The electroplating layer of the coil layer and the electroplating layer of the via may be formed integrally, and may not form a boundary between them, but the electroplating layer is not limited thereto.

[0079] In the following, reference will be made to Figure 3 The shapes and arrangements of the cores 130 and 140 according to the present disclosure are described. For ease of explanation, Figure 3 The supporting member 200 is omitted.

[0080] The coil component 1000 according to the first exemplary embodiment in the present disclosure may include a first core 130 and a second core 140 .

[0081] The first coil 300 may form at least one turn, and the first core 130 may be formed by filling a region passing through the center of the first coil 300 with a portion of the body 100. For convenience of explanation, the region passing through the center of the first upper coil layer 310 may be referred to as the first core 130.

[0082] Similarly, the second coil 400 may form at least one turn, and the second core 140 may be formed by filling a region passing through the center of the second coil 400 with a portion of the body 100. For convenience of explanation, the region passing through the center of the second upper coil layer 410 may be referred to as the second core 140.

[0083] Reference Figure 3 , the first core 130 may include a first common core 131 overlapped with the second core 140 and a first non-common core 132 not overlapped with the second core 140. Here, "overlapping" may refer to when the cores 130 and 140 are viewed from the axial direction ( Figure 3 The regions overlap each other when viewed in the X direction (in the X direction).

[0084] Similarly, the second core 140 may include a second shared core 141 overlapped with the first core 130 and a second non-shared core 142 not overlapped with the first core 130 .

[0085] In the coil component 1000 according to the exemplary embodiment in the present disclosure, the coils 300 and 400 may be formed adjacent to each other and share cores 130 and 140. Therefore, the coupling coefficient may be adjusted by appropriately increasing or decreasing the relative area ratio of the shared core and the non-shared core. The leakage inductance and the mutual inductance may be adjusted to a desired value. The closer the value of the coupling coefficient is to 1, the greater the degree of coupling, and the negative (-) sign indicates negative coupling.

[0086] The first common core 131 may be disposed closer to the fifth surface 105 of the body 100 than the first non-common core 132. The first non-common core 132 may be disposed closer to the sixth surface 106 of the body 100 than the first common core 131.

[0087] Similarly, the second shared core 141 may be disposed closer to the fifth surface 105 of the body 100 than the second non-shared core 142. The second non-shared core 142 may be disposed closer to the sixth surface 106 of the body 100 than the second shared core 141. That is, the first non-shared core 132 and the second non-shared core 142 may be disposed on the same side relative to the first shared core 131 and the second shared core 141 in the third direction (Z direction).

[0088] The first non-shared core 132 may be closer to the third surface 103 of the body 100 than the second non-shared core 142. The second non-shared core 142 may be closer to the fourth surface 104 of the body 100 than the first non-shared core 132.

[0089] Since the first non-shared core 132 and the second non-shared core 142 are arranged on the same side of the main body 100 in the third direction (Z direction) relative to the first shared core 131 and the second shared core 141, the coil misalignment caused by process variations during coil formation can be minimized, thereby reducing the characteristic deviation of the coil component and increasing the yield.

[0090] The coil component 1000 according to the first exemplary embodiment in the present disclosure may further include external electrodes 531 , 532 , 541 , and 542 .

[0091] The first external electrode 531, the second external electrode 532, the third external electrode 541, and the fourth external electrode 542 may be disposed outside the body 100 and connected to the coils 300 and 400. Specifically, the first external electrode 531 and the second external electrode 532 may be disposed on the third surface 103 of the body 100, and the third external electrode 541 and the fourth external electrode 542 may be disposed on the fourth surface 104 of the body 100.

[0092] The first and second external electrodes 531 and 532 may be disposed to be spaced apart from each other on the third surface 103 of the body 100 and may be respectively connected to one end of the first upper coil layer 310 and one end of the first lower coil layer 320. The third and fourth external electrodes 541 and 542 may be disposed to be spaced apart from each other on the fourth surface 104 of the body 100 and may be respectively connected to one end of the second upper coil layer 410 and one end of the second lower coil layer 420.

[0093] The first external electrode 531, the second external electrode 532, the third external electrode 541, and the fourth external electrode 542 may be formed using a paste containing a metal having excellent electrical conductivity (such as a conductive paste containing nickel (Ni), copper (Cu), tin (Sn), or silver (Ag) or an alloy thereof). In addition, a plating layer may be provided to cover each of the first external electrode 531, the second external electrode 532, the third external electrode 541, and the fourth external electrode 542. In this case, the plating layer may include one or more selected from the group consisting of nickel (Ni), copper (Cu), and tin (Sn). For example, a nickel (Ni) layer and a tin (Sn) layer may be sequentially formed in the plating layer.

[0094] The coil component 1000 according to the first exemplary embodiment in the present disclosure may further include an insulating layer 600 .

[0095] Reference Figure 5 and Figure 6 , the coil component according to the first exemplary embodiment may include an upper insulating layer 610 disposed between the first upper coil layer 310 and the second upper coil layer 410 , and a lower insulating layer 620 disposed between the first lower coil layer 320 and the second lower coil layer 420 .

[0096] Reference Figure 5 The upper insulating layer 610 may be disposed between the first upper coil layer 310 and the second upper coil layer 410 and cover the second upper coil layer 410. The lower insulating layer 620 may be disposed between the first lower coil layer 320 and the second lower coil layer 420 and cover the first lower coil layer 320.

[0097] The insulating layers 610 and 620 may be formed using an insulating material including a thermosetting insulating resin (such as an epoxy resin), a thermoplastic insulating resin (such as a polyimide resin), or a photosensitive insulating resin, or may be formed using an insulating material formed by impregnating a reinforcing material (such as glass fiber or an inorganic filler) in such an insulating resin. For example, the insulating layers 610 and 620 may be formed by stacking insulating films on both surfaces of the support member 200 on which the second upper coil layer 410 and the first lower coil layer 320 are provided. Specifically, the insulating layers 610 and 620 may be formed by stacking a thin film type insulating material such as a prepreg, an Ajinomoto built-up film (ABF), FR-4, a bismaleimide triazine (BT) film, or a photosensitive dielectric (PID) film, but are not limited thereto, and may be formed by coating and then curing a liquid insulating resin.

[0098] Reference Figure 6 , the first via hole V1 may penetrate the support member 200 and the upper insulating layer 610 to connect the first upper coil layer 310 and the first lower coil layer 320 to each other.

[0099] Similarly, the second via hole V2 may penetrate the support member 200 and the lower insulating layer 620 to connect the second upper coil layer 410 and the second lower coil layer 420 to each other.

[0100] The insulating film IF may be formed on the surface of each of the first upper coil layer 310 and the second lower coil layer 420. The insulating film IF may be disposed between the first upper coil layer 310 and the second lower coil layer 420 and the main body 100. The insulating film IF may fill an area such as a space between adjacent turns of the first upper coil layer 310 and an area of ​​the space between adjacent turns of the second lower coil layer 420. The insulating film IF may be used to electrically separate the first upper coil layer 310 and the second lower coil layer 420 from the main body 100, and may include known insulating materials such as polyparaxylene, but is not limited thereto. As another example, the insulating film IF may include an insulating material such as epoxy resin instead of polyparaxylene. The insulating film IF may be formed by a vapor deposition method, but is not limited thereto. As another example, the insulating film IF may be formed by stacking an insulating film for forming the insulating film IF on each of the surface of the first upper coil layer 310 and the surface of the second lower coil layer 420 in a state where the first upper coil layer 310 and the second lower coil layer 420 are formed and then curing, or may be formed by applying an insulating paste for forming the insulating film IF to the surface of the first upper coil layer 310 and the surface of the second lower coil layer 420 in a state where the first upper coil layer 310 and the second lower coil layer 420 are formed and then curing. In addition, when the body 100 has sufficient resistance at the designed operating current and voltage of the coil component 1000, the insulating film IF may be omitted in the present exemplary embodiment. That is, for the above-mentioned reasons, the insulating film IF may be omitted in the present exemplary embodiment.

[0101] Second Exemplary Embodiment

[0102] Will refer to Figures 7 to 12 A coil component 2000 according to a second exemplary embodiment in the present disclosure is described.

[0103] Figure 7 is a schematic perspective view showing a coil component according to a second exemplary embodiment in the present disclosure. Figure 8 It is shown Figure 7 An exploded perspective view of the coil connection structure of the coil assembly. Fig. 9 yes Figure 7 A plan view of the coil assembly when viewed from above. Fig.10 yes Figure 7 A plan view of the coil when viewed layer by layer from above. Fig.11 It is along Figure 7 A cross-sectional view taken along line III-III'. Fig.12 It is along Figure 7 A cross-sectional view taken along line IV-IV'.

[0104] The coil component 2000 according to the second exemplary embodiment is different from the coil component 1000 according to the first exemplary embodiment in that the support member 200 and the insulating layers 610 and 620 are omitted. Fig.11 and Fig.12 , it can be confirmed that the support member 200 and the insulating layers 610 and 620 are omitted.

[0105] The first coil 300 and the second coil 400 of the coil component 2000 according to the second exemplary embodiment can be a winding coil formed by winding a metal wire (such as a copper wire (Cu-wire)) including a metal wire and a coating CL covering the surface of the metal wire in a spiral shape. The metal wire can be a flat wire, but is not limited to this. In the case where the coils 300 and 400 are formed using flat wires, the cross section of each turn of the coil may have a rectangular shape. The metal wire can be formed using 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 an alloy thereof, but is not limited thereto. The coating CL may include epoxy resin, polyimide, liquid crystal polymer, etc. or a mixture thereof, but is not limited thereto.

[0106] The description in the first exemplary embodiment can be applied to other components of the present exemplary embodiment as it is, and thus, description of the other components is omitted.

[0107] As described above, according to exemplary embodiments in the present disclosure, the coil component may enable effective control of characteristic deviations between coils through an arrangement structure of the coils.

[0108] While example 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 having a first surface, a second surface opposite to the first surface in a first direction, and a third surface, a fourth surface, a fifth surface, and a sixth surface, the third surface, the fourth surface, the fifth surface, and the sixth surface being side surfaces connecting the first surface and the second surface to each other; as well as A first coil and a second coil are disposed inside the body and each includes an upper coil layer and a lower coil layer, respectively, the first coil includes a first core, and the second coil includes a second core, wherein the upper coil layer of the second coil is disposed between the upper coil layer of the first coil and the lower coil layer of the first coil, The lower coil layer of the first coil is disposed between the upper coil layer of the second coil and the lower coil layer of the second coil, The first core includes a first common core stacked with the second core and a first non-common core not stacked with the second core, and The second core includes a second common core stacked with the first core and a second non-common core not stacked with the first core.

2. The coil assembly according to claim 1, wherein: The first shared core and the second shared core are disposed closer to the fifth surface of the body than the first non-shared core and the second non-shared core, and The first non-shared core and the second non-shared core are disposed closer to the sixth surface of the body than the first shared core and the second shared core.

3. The coil assembly according to claim 1, wherein: The first non-shared core is disposed closer to the third surface of the body than the second non-shared core, and The second non-shared core is disposed closer to the fourth surface of the body than the first non-shared core.

4. The coil assembly according to claim 1, wherein: The first coil and the second coil are spaced apart from each other.

5. The coil assembly according to claim 1, wherein: The upper coil layer of the first coil and the lower coil layer of the first coil form at least one turn, and the upper coil layer of the second coil and the lower coil layer of the second coil form at least one turn.

6. The coil assembly according to claim 1, wherein: The upper coil layer of the first coil has a first straight portion and a second straight portion, the first straight portion being adjacent to and parallel to the third surface of the body, and the second straight portion being adjacent to and parallel to the fourth surface of the body, The upper coil layer of the second coil has a third straight portion and a fourth straight portion, the third straight portion being adjacent to and parallel to the third surface of the body, and the fourth straight portion being adjacent to and parallel to the fourth surface of the body, The length of the first straight portion is greater than the length of the second straight portion, and The length of the fourth straight portion is greater than the length of the third straight portion.

7. The coil assembly according to claim 6, wherein: The first straight portion is disposed closer to the sixth surface of the body than the second straight portion, and The fourth straight portion is disposed closer to the sixth surface of the body than the third straight portion.

8. The coil assembly according to claim 1, wherein: One end of the upper coil layer of the first coil extends to the third surface of the body, One end of the lower coil layer of the first coil extends to the third surface of the body, One end of the upper coil layer of the second coil extends to the fourth surface of the body, and One end of the lower coil layer of the second coil extends to the fourth surface of the body.

9. The coil assembly of claim 1, further comprising: A first external electrode and a second external electrode are disposed on the third surface of the body; as well as A third external electrode and a fourth external electrode are disposed on the fourth surface of the body.

10. A coil assembly, comprising: a body having a first surface, a second surface opposite to the first surface in a first direction, and a third surface, a fourth surface, a fifth surface, and a sixth surface, the third surface, the fourth surface, the fifth surface, and the sixth surface being side surfaces connecting the first surface and the second surface to each other; A supporting member, disposed inside the main body; as well as The upper coil layer and the lower coil layer are respectively arranged on both sides of the supporting member. Wherein, the upper coil layer includes a first upper coil layer and a second upper coil layer, The lower coil layer includes a first lower coil layer connected to the first upper coil layer and a second lower coil layer connected to the second upper coil layer, The first upper coil layer forms a first core, and the second upper coil layer forms a second core, The first core includes a first common core stacked with the second core and a first non-common core not stacked with the second core, and The second core includes a second common core stacked with the first core and a second non-common core not stacked with the first core.

11. The coil assembly according to claim 10, wherein: The first upper coil layer, the second upper coil layer, the first lower coil layer, and the second lower coil layer are arranged in order of the first upper coil layer, the second upper coil layer, the first lower coil layer, and the second lower coil layer in the first direction.

12. The coil assembly of claim 10, further comprising: a first insulating layer, disposed between the first upper coil layer and the second upper coil layer; as well as The second insulating layer is disposed between the first lower coil layer and the second lower coil layer.

13. The coil assembly of claim 10, further comprising: a first via hole, connecting the first upper coil layer and the first lower coil layer; as well as The second via hole connects the second upper coil layer and the second lower coil layer.

14. The coil assembly according to claim 13, wherein: The first via hole and the second via hole penetrate the supporting member.

15. The coil assembly according to claim 10, wherein: The first shared core and the second shared core are disposed closer to the fifth surface of the body than the first non-shared core and the second non-shared core, and The first non-shared core and the second non-shared core are disposed closer to the sixth surface of the body than the first shared core and the second shared core.

16. The coil assembly according to claim 10, wherein: The first non-shared core is disposed closer to the third surface of the body than the second non-shared core, and The second non-shared core is disposed closer to the fourth surface of the body than the first non-shared core.

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