Coil component

Abstract

To provide a coil component which is suitable for effectively realizing a coupling coefficient as a target, and improve characteristics of saturation current and / or the like.SOLUTION: A coil component includes: a main body; a first coil 121 that is arranged in the main body, and includes a first coil part 121C having a winding axis oriented in a first direction D1, and also includes first and second lead-out parts 121A, B; a second coil 122 that is separated away from the first coil part in the first direction and includes a second coil part 122C having a winding axis oriented in the first direction, and also includes third and fourth lead-out parts 122A and B; a coupling adjustment part 130 that is arranged between the first and second coils, and includes a first region R1 positioned in a part of regions overlapping the first core of the first coil part and the second core of the second coil part in the first direction, and also includes a second region R2 positioned in at least a part of regions surrounding the first region to a side direction and having magnetic permeability different from that of the first region; first and second external electrodes that are coupled to the first and second leading parts, respectively; and third and fourth external electrodes that are coupled to the third and fourth leading parts, respectively.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a coil component. [Background technology]

[0002] As electronic devices such as digital TVs, mobile phones, and notebooks become smaller and thinner, there is a demand for the coil components used in these electronic devices to also become smaller and thinner. To meet these demands, research and development of various types of wound or thin-film type coil components is being actively conducted.

[0003] The main issue with making coil components smaller and thinner is how to achieve the same characteristics as before despite the smaller and thinner coils. To meet this requirement, it is necessary to increase the proportion of magnetic material in the core that is filled with the magnetic material, but there is a limit to how much the proportion can be increased due to factors such as the strength of the inductor body and changes in frequency characteristics due to insulation.

[0004] Meanwhile, there is an increasing demand for array-type components, which have the advantage of reducing the mounting area of ​​coil components. Such array-type coil components can be in the form of non-coupled or coupled inductors, or a combination of the above, depending on the coupling coefficient or mutual inductance between multiple coils. Inductors in such array types can achieve a desired coupling coefficient while maintaining a low saturation current (I sat ) and other characteristics must be ensured. Summary of the Invention [Problem to be solved by the invention]

[0005] One of the objectives of the present invention is to provide a MOSFET that is suitable for effectively achieving a target coupling coefficient and has a saturation current (I sat The present invention aims to provide a coil component capable of improving the characteristics such as the above. [Means for solving the problem]

[0006] In a method for solving the above-mentioned problems, the present invention proposes a novel structure of a coil device through an example, and specifically, the present invention includes a main body, a first coil disposed within the main body, the first coil including a first coil section having a winding axis in a first direction, and a first lead section and a second lead section, a second coil disposed within the main body, spaced apart from the first coil section in the first direction, the second coil including a third lead section and a fourth lead section, a coupling adjustment section disposed between the first coil and the second coil to support the first coil and the second coil, the coupling adjustment section including a first region located in at least a part of a region overlapping with a first core of the first coil section and a second core of the second coil section in the first direction, and a second region located in at least a part of a region laterally surrounding the first region and having a magnetic permeability different from that of the first region, and a first external electrode and a second external electrode connected to the first lead section and the second lead section, respectively, and a third external electrode and a fourth external electrode connected to the third lead section and the fourth lead section, respectively.

[0007] In an embodiment, the first coil portion and the second coil portion may be disposed on a first surface and a second surface facing each other in the second region of the coupling adjustment portion, respectively.

[0008] In one embodiment, the second region may be configured to extend along a side of the body.

[0009] In one embodiment, the second region may be disposed at an outer region of the first coil portion and the second coil portion.

[0010] In one embodiment, the second region may be laterally surrounded by the main body.

[0011] In an embodiment, the first region may extend in a region where the first coil portion and the second coil portion overlap in the first direction.

[0012] In an embodiment, the second region may extend in a direction in which a first core of the first coil portion and a second core of the second coil portion are located.

[0013] In one embodiment, the first region may form a unitary structure with the body.

[0014] In one embodiment, the second region may have a lower magnetic permeability than the first region.

[0015] In one embodiment, the first region may have a higher filling rate of magnetic particles than the second region.

[0016] In one embodiment, the first region may contain two or more types of magnetic particles having different D50 sizes.

[0017] In one embodiment, the second region may include a magnetic sheet.

[0018] In one embodiment, the magnetic sheet may include ferrite.

[0019] In one embodiment, the first lead-out portion may be disposed at the same level as the first coil portion, the second lead-out portion may be disposed at the same level as the second coil portion, the third lead-out portion may be disposed at the same level as the second coil portion, and the fourth lead-out portion may be disposed at the same level as the first coil portion.

[0020] In one embodiment, the first coil portion includes a plurality of coil layers, the first and second pull-out portions being arranged on the first coil portion side with respect to the coupling adjustment portion, and the second coil portion includes a plurality of coil layers, and the third and fourth pull-out portions being arranged on the second coil portion side with respect to the coupling adjustment portion.

[0021] In an embodiment, the absolute value of a coupling coefficient between the first coil and the second coil may be equal to or greater than 0.495 and less than 0.605.

[0022] Another embodiment of the present invention comprises: a first coil disposed within the main body, the first coil including a first coil section having a winding axis in a first direction, and a first lead section and a second lead section; a second coil disposed within the main body, spaced apart from the first coil section in the first direction, the second coil including a third lead section and a fourth lead section; a coupling adjuster disposed between the first coil and the second coil, the coupling adjuster including a first region located in at least a portion of a region overlapping with a first core of the first coil section and a second core of the second coil section in the first direction, and a second region located in at least a portion of a region surrounding the first region in a lateral direction; and first and second external electrodes connected to the first and second lead sections, respectively, and third and fourth external electrodes connected to the third and fourth lead sections, respectively, the coupling adjuster including an Fe-based alloy, and the Fe-based alloy included in the first region and the Fe-based alloy included in the second region have different compositions.

[0023] In an embodiment, the Fe-based alloy included in the first region may have a higher Fe content than the Fe-based alloy included in the second region.

[0024] In one embodiment, the Fe-based alloy is an Fe-Si-based alloy, and the Fe-Si-based alloy included in the first region may have a higher Si content than the Fe-Si-based alloy included in the second region.

[0025] In one embodiment, the Si content in the Fe-Si alloy contained in the first region may be 6.5 wt% or more, and the Si content in the Fe-Si alloy contained in the second region may be less than 6.5 wt%.

[0026] In one embodiment, the Si content in the Fe—Si system contained in the second region may be 1 wt % or more and 5 wt % or less.

[0027] Yet another embodiment of the present invention comprises: The present invention provides a coil component including a main body, a first coil disposed within the main body, the first coil including a plurality of first coil layers having a winding axis in a first direction, and a first lead-out portion and a second lead-out portion, a second coil disposed within the main body, the second coil including a plurality of second coil layers having a winding axis in the first direction, and a third lead-out portion and a fourth lead-out portion, a coupling adjustment portion disposed between the plurality of first coil layers and between the plurality of second coil layers, the coupling adjustment portion including a first region located in at least a portion of a region overlapping in the first direction with a first core of the first coil and a second core of the second coil, and a second region located in at least a portion of a region laterally surrounding the first region and having a magnetic permeability different from that of the first region, and a first external electrode and a second external electrode connected to the first lead-out portion and the second lead-out portion, respectively, and a third external electrode and a fourth external electrode connected to the third lead-out portion and the fourth lead-out portion, respectively. Effect of the Invention

[0028] The coil component according to an example of the present invention is suitable for effectively achieving a target coupling coefficient, and the saturation current (I sat ) and other properties can be improved. [Brief description of the drawings]

[0029] [Figure 1] 1 is a transparent perspective view that shows a schematic view of a coil device according to a first embodiment of the present invention. [Diagram 2] 2 is a plan view of the coil device of FIG. 1 as viewed from above. [Diagram 3] 2 is an exploded perspective view of a coil and a coupling adjuster in the coil device of FIG. 1. FIG. [Figure 4] FIG. 2 is a cross-sectional view of the coil component of FIG. [Diagram 5] 4 is an enlarged cross-sectional view of a first region of the coupling adjustment portion. FIG. [Figure 6] 11 is an enlarged cross-sectional view of a second region of the coupling adjustment portion. FIG. [Figure 7] 11 is an enlarged cross-sectional view of a first region of a coupling adjustment portion in a modified example. FIG. [Figure 8] 11 is an enlarged cross-sectional view of a first region of a coupling adjustment portion in a modified example. FIG. [Figure 9] FIG. 11 is a cross-sectional view of a coil part according to a modified example. [Figure 10] FIG. 11 is a cross-sectional view of a coil part according to a modified example. [Figure 11] FIG. 11 is a cross-sectional view of a coil part according to a modified example. [Figure 12] FIG. 11 is a transparent perspective view that shows a schematic view of a coil device according to a second embodiment of the present invention. [Figure 13] 13 is an exploded perspective view of a first coil and a second coil in the coil device of FIG. 12. [Figure 14] FIG. 13 is a cross-sectional view of the coil component of FIG. [Figure 15] FIG. 11 is a transparent perspective view that shows a schematic view of a coil device according to a third embodiment of the present invention. [Figure 16] 16 is an exploded perspective view of a coil and a coupling adjuster in the coil device of FIG. 15. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, the embodiments of the present invention will be described with reference to specific embodiments and the accompanying drawings. However, the embodiments of the present invention can be modified into several other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Therefore, the shapes and sizes of elements in the drawings may be enlarged or reduced (or highlighted or simplified) for clearer explanation, and elements indicated by the same reference numerals in the drawings are the same elements.

[0031] Various types of electronic components are used in electronic devices, and various types of coil components can be appropriately used between such electronic components for the purpose of noise removal, etc. That is, coil components in electronic devices can be used as power inductors, HF inductors, general beads, GHz beads, common mode filters, etc.

[0032] FIG. 1 is a transparent perspective view showing a coil device according to a first embodiment of the present invention, FIG. 2 is a plan view of the coil device of FIG. 1 seen from above, FIG. 3 is an exploded perspective view of a coil and a coupling adjustment part, and FIG. 4 is a cross-sectional view of the coil device of FIG. 1.

[0033] 1 to 4, the coil device 100 according to the present embodiment includes a main body 110, a first coil 121, a second coil 122, a coupling adjustment unit 130, a first external electrode 141, a second external electrode 142, a third external electrode 143, and a fourth external electrode 144, and the first coil 121 and the second coil 122 are realized as an array-type inductor in which they are magnetically coupled. Here, the coupling adjustment unit 130 includes a first region R1 and a second region R2 surrounding the first region R1 in a lateral direction, and the first region R1 and the second region R2 are realized in a form in which the magnetic permeability is different from each other, so that the degree of coupling between the first coil 121 and the second coil 122 can be appropriately adjusted. This will be described in detail later, and the main elements constituting the coil device 100 according to the present embodiment will be described below.

[0034] The main body 110 may have the first coil 121 and the second coil 122 disposed therein, and may form the overall appearance of the coil device 100. In this case, the main body 110 may include an upper surface and a lower surface facing the first direction D1, and a plurality of side surfaces connecting the upper surface and the lower surface. The main body 110 may include an insulating resin and a magnetic material. Specifically, the main body 110 may be formed by stacking one or more magnetic composite sheets in which a magnetic material is dispersed in an insulating resin. The magnetic material may be ferrite or a metal magnetic powder. The ferrite may be, for example, at least one of spinel-type ferrites such as Mg-Zn-based, Mn-Zn-based, Mn-Mg-based, Cu-Zn-based, Mg-Mn-Sr-based, and Ni-Zn-based ferrites, hexagonal-type ferrites such as Ba-Zn-based, Ba-Mg-based, Ba-Ni-based, Ba-Co-based, and Ba-Ni-Co-based ferrites, garnet-type ferrites such as Y-based, and Li-based ferrites. The metal magnetic powder may include at least one selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu) and nickel (Ni). For example, the metal magnetic 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 metal magnetic powder may be amorphous or crystalline. For example, the metal magnetic powder may be Fe-Si-B-Cr amorphous alloy powder, but is not necessarily limited thereto. The ferrite and metal magnetic powder may each have an average diameter of about 0.1 μm to 30 μm, but are not limited thereto. The main body 110 may include two or more types of magnetic materials dispersed in a resin. Here, different types of magnetic materials means that the magnetic materials dispersed in the resin are distinguished from each other in any one of average diameter, composition, crystallinity, and shape.The insulating resin may include, but is not limited to, epoxy, polyimide, liquid crystal polymer, and the like, either alone or in combination.

[0035] In relation to an example of a manufacturing method, the main body 110 may be formed by a lamination method. Specifically, a number of unit laminates for manufacturing the main body 110 may be prepared and stacked on the upper and lower parts of the first coil 121 and the second coil 122. Here, the unit laminate may be manufactured in a sheet shape by mixing magnetic particles such as metal with organic substances such as a thermosetting resin, a binder, and a solvent to manufacture a slurry, applying the slurry to a thickness of several tens of μm on a carrier film by a doctor blade method, and then drying the slurry. Thus, the unit laminate may be manufactured in a form in which magnetic particles are dispersed in a thermosetting resin such as an epoxy resin or polyimide.

[0036] The first coil 121 is disposed in the main body 110 and includes a first coil portion 121C having a winding axis in the first direction D1, a first lead portion 121A, and a second lead portion 121B. The second coil 122 is disposed in the main body 110 and includes a second coil portion 122C, a third lead portion 122A, and a fourth lead portion 122B, which are spaced apart from the first coil portion 121C in the first direction D1 and have a winding axis in the first direction D1. In this embodiment, the first coil portion 121C and the second coil portion 122C may each have a single-layer structure. That is, the first lead portion 121A of the first coil 121 may be disposed at the same level as the first coil portion 121C, and the second lead portion 121B may be disposed at the same level as the second coil portion 122C. Here, the end of the first coil portion 121C and the second lead portion 121B may be connected by a conductive via V1. Similarly, the third lead-out portion 122A of the second coil 122 may be disposed at the same level as the second coil portion 122C, and the fourth lead-out portion 122B may be disposed at the same level as the first coil portion 121C. Here, the end of the second coil portion 122C and the fourth lead-out portion 122B may be connected by a conductive via V2.

[0037] 2, the first coil portion 121C and the second coil portion 122C may have a shape including all of the regions where the cores C1 and C2 of each other overlap in the winding axis direction and the regions where they do not overlap. Specifically, a part of the first core C1 of the first coil portion 121C may form a shared core region that overlaps with the second core C2 of the second coil portion 122C in the first direction D1, and at least a part of the other region may form a non-shared core region that does not overlap with the second core C2 of the second coil portion 122C. Similarly, a part of the second core C2 of the second coil portion 122C may form a non-shared core region that does not overlap with the first core C1 of the first coil portion 121C in the first direction D1.

[0038] Meanwhile, the first coil 121 and the second coil 122 may be a plating pattern formed using a plating process used in the art, such as pattern plating, anisotropic plating, isotropic plating, etc., and may be formed in a multi-layer structure using a plurality of these processes. Examples of materials constituting the first coil 121 and the second coil 122 include, but are not limited to, conductive materials such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), or alloys thereof.

[0039] The first external electrode 141 and the second external electrode 142 are connected to the first coil 121, specifically to the first lead portion 121A and the second lead portion 121B, respectively. The third external electrode 143 and the fourth external electrode 144 are connected to the second coil 122, specifically to the third lead portion 122A and the fourth lead portion 122B, respectively. In this case, the first external electrode 141 and the second external electrode 142 may be disposed on the same side surface of the main body 110 and may extend to the lower surface, and similarly, the third external electrode 143 and the fourth external electrode 144 may be disposed on the same side surface of the main body 110 and may extend to the lower surface. The first to fourth external electrodes 141 to 144 may be formed using a paste containing a metal with excellent electrical conductivity, and may be, for example, a conductive paste containing nickel (Ni), copper (Cu), tin (Sn), silver (Ag), or the like alone or an alloy thereof. Also, a plating layer may be provided to cover each of the first to fourth external electrodes 141 to 144. In this case, the plating layer may include at least one selected from the group consisting of nickel (Ni), copper (Cu) and tin (Sn), and for example, a nickel (Ni) layer and a tin (Sn) layer may be formed in sequence.

[0040] The coupling adjustment unit 130 includes the first coil unit 121C and the second coil unit 122C, and includes a first region R1 and a second region R2 having different magnetic permeability. More specifically, the first region R1 is located in at least a part of a region overlapping the first core C1 of the first coil unit 121C and the second core C2 of the second coil unit 122C in the first direction D1. As a result, the first coil unit 121C and the second coil unit 122C can form a coupled magnetic flux (solid arrow in FIG. 4) in at least a part of the first region R1. The second region R2 is located in at least a part of a region surrounding the first region R1 in the lateral direction, and has a different magnetic permeability from the first region R1. At least a part of the second region R2 can be located in a leakage magnetic flux path (dotted arrow in FIG. 4) of each of the first coil unit 121C and the second coil unit 122C. In this way, the first region R1 and the second region R2 located in the coupling magnetic flux path and the leakage magnetic flux path, respectively, have different magnetic permeabilities, so that the coupling coefficient of the first coil 121 and the second coil 122 can be effectively adjusted. For example, when the coupling coefficient of the first coil 121 and the second coil 122 is targeted to be 0.495 or more and less than 0.605 on an absolute value basis, it is not easy to precisely adjust the distance between the first coil 121 and the second coil 122 and the magnetic material of the main body 110 to match the coupling coefficient. Therefore, the inventors of the present invention have arranged a coupling adjustment unit 130 between the first coil 121 and the second coil 122, so that the target coupling coefficient value can be achieved without making the distance between the first coil 121 and the second coil 122 too far or too close.

[0041] As a specific example, the second region R2 may have a lower magnetic permeability than the first region R1. The first region R1 may be integrally formed with the main body 110. However, the first region R1 may be manufactured separately from the main body 110 and may be formed of magnetic particles of a different type or size. By setting the magnetic permeability of the second region R2 relatively low as in this embodiment, the magnitude of leakage magnetic flux of each of the first coil portion 121C and the second coil portion 122C can be reduced without excessively reducing the spacing between the first coil portion 121C and the second coil portion 122C, thereby reducing the saturation current (I sat ) can be reduced. The first region R1 has a relatively high magnetic permeability, but if the magnetic permeability of the first region R1 is reduced to a level similar to that of the second region R2, the magnitude of the coupling magnetic flux may be reduced, and in order to compensate for this, it is necessary to increase the number of turns of the first coil portion 121C and the second coil portion 122C or reduce the interval between them. By making the first region R1 have a relatively high level of magnetic permeability as in this embodiment, it is possible to sufficiently ensure the magnitude of the coupling magnetic flux without increasing the number of turns of the first coil portion 121C and the second coil portion 122C or reducing the interval between them excessively, and thus it is possible to effectively achieve the target coupling coefficient.

[0042] A specific form of the coupling adjuster 130 will be described in detail. First, as in the present embodiment, the first coil part 121C and the second coil part 122C may be disposed on the first and second surfaces (corresponding to the upper and lower surfaces, respectively, based on the drawing) facing each other in the second region R2 of the coupling adjuster 130. In this case, the first coil 121 and the second coil 122 may be supported by the coupling adjuster 130 and may be formed on the first and second surfaces of the coupling adjuster 130 using a plating process or the like. In addition, the second region R2 of the coupling adjuster 130 may extend to the side of the main body 110. As a result, the second region R2 may be disposed in an outer region of the first coil part 121C and the second coil part 122C. In this way, by disposing the second region R2, which has a relatively low magnetic permeability in the coupling adjustment part 130, in the region between the first coil part 121C and the second coil part 122C and in the region outside the region, the magnitude of leakage magnetic flux of the first coil 121 and the second coil 122 can be effectively reduced.

[0043] The region where the coupling adjustment unit 130 is formed may vary depending on the magnitude of the desired coupling coefficient and other characteristics, which will be described with reference to the modified examples of FIGS. 9 to 11. First, as in the modified example of FIG. 9, the second region R2 of the coupling adjustment unit 130 may be realized in a form surrounded by the main body 110 in the lateral direction. In this case, the second region R2 may be formed limited to the region where the first coil part 121C and the second coil part 122C are formed, and may not be formed outside the first coil part 121C and the second coil part 122C. When the coupling adjustment unit 130 has such an arrangement, the magnitude of the coupling magnetic flux of the first coil 121 and the second coil 122 may be increased outside the first coil part 121C and the second coil part 122C.

[0044] 10, the coupling adjuster 130 may have a shape in which the first region R1 is expanded. That is, the first region R1 may extend to a region where the first coil portion 121C and the second coil portion 122C overlap in the first direction D1, and in this case, the region where the second region R2 is formed may be limited to the outside of the first coil portion 121C and the second coil portion 122C.

[0045] 11, the second region R2 of the coupling adjuster 130 may be partially expanded inwardly, that is, the second region R2 may be realized in a form extending in a direction in which the cores of the first coil portion 121C and the second coil portion 122C are located.

[0046] As described above, the coupling adjustment unit 130 has different magnetic permeabilities in the first region R1 and the second region R2. For example, the magnetic permeability of the second region R2 may be lower than that of the first region R1. If it is difficult to measure the magnetic permeability of each region in the coil component 100, the magnetic permeability may be compared by analyzing the type, particle size, packing rate, etc. of the magnetic material contained in the first region R1 and the second region R2. Hereinafter, with reference to Figs. 5 to 9, a form in which the magnetic permeability of the first region R1 and the second region R2 is adjusted will be described. In addition, the packing rate of the magnetic particles in the second region R2 is adjusted to be lower than that of the first region R1.

[0047] 5 and 6, the first region R1 includes magnetic particles P11, and an insulating material 131 such as resin is interposed between the magnetic particles P11. Similarly, the second region R2 includes magnetic particles P21, and an insulating material 132 such as resin is interposed between the magnetic particles P12. As shown in the figures, the packing rate of the magnetic particles P11 in the first region R1 may be higher than that of the magnetic particles P21 in the second region R2. As an example of a method for obtaining the packing rate, after obtaining SEM images of the first region R1 and the second region R2, the ratio of the area occupied by the magnetic particles P11 and P21 to the total area may be calculated, and in this case, the packing rate value may be obtained for multiple cross sections to obtain a more accurate value.

[0048] When there is no large difference in size between the magnetic particles P11 and P21 in the first region R1 and the second region R2, for example, when the difference between the D50 of the magnetic particles P11 in the first region R1 and the D50 of the magnetic particles P21 in the second region R2 is 10% or less, the packing ratio of the magnetic particles P11 and P21 may affect the magnetic permeability in the region. Here, the difference in D50 being 10% or less means that the ratio of the difference between the large value and the small value of D50 to the large value of D50 is 10% or less. As an example, the magnetic particles P11 included in the first region R1 may have a diameter range of 5 to 61 μm, and similarly, the magnetic particles P21 included in the second region R2 may have a diameter range of 5 to 61 μm.

[0049] In order to increase the filling rate of the magnetic particles, magnetic particles with different particle size distributions can be used. That is, the first region R1 can contain two or more types of magnetic particles with different D50 sizes, and FIG. 7 shows an example using two types of particles P11 and P12, and FIG. 8 shows an example using three types of particles P11, P12, and P13. In this way, by using a plurality of magnetic particles with different D50 sizes, the filling rate of the magnetic particles can be improved, and the magnetic permeability of the corresponding region can be increased. In this case, the first magnetic particles P11 included in the first region R1 can have a diameter range of 5 to 61 μm, the second magnetic particles P12 can have a diameter range of 0.9 to 4.5 μm, and the third magnetic particles P13 can have a diameter range of 10 to 800 nm.

[0050] The diameters of the magnetic particles P11 to P13, P21 present in the coupling adjustment part 130 can be measured at the cross section of the coupling adjustment part 130. Specifically, after photographing a plurality of areas (e.g., 5 or 10 areas) at equal intervals in the D2 direction with respect to the D1-D3 cross section passing through the center of the main body 110 with a scanning electron microscope, the diameters of the magnetic particles P11 to P13, P21 can be obtained using an image analysis program. In this case, as a specific example, the image pixel size in the SEM image can be fixed to 10 nm×10 nm, and the working distance can be fixed to 8 mm. In addition, the back scattered mode can be used as the mode. Then, the average diameter can be calculated using an image analysis program (e.g., Deep learning tool by ORS). The magnetic particles P11 to P13, P21 can be spherical or nearly spherical, but are not limited thereto. That is, the magnetic particles P11 to P13, P21 can also have a non-spherical shape. Such a shape can be obtained by the sphericity being reduced during the oxidation process of the magnetic particles P11-P13 and P21. If the magnetic particles P11-P13 and P21 have any shape that does not maintain a spherical shape, the above-mentioned diameter can be interpreted as a ferret diameter, and the average diameter can be interpreted as an average pellet diameter. As a method for calculating the average diameter, a tool of image processing software can be used, and a size distribution can be obtained by particle size analysis for each region. In the above description, the diameters of the magnetic particles P11-P13 and P21 can be measured by taking multiple cross sections of the magnetic component, but if it is difficult to take multiple cross sections, they can also be measured in one cross section, for example, D1-D3 cross section or D1-D2 cross section passing through the center of the main body 110.

[0051] Meanwhile, in the above embodiment, the magnetic permeability of the coupling control unit 130 of the magnetic particles is made different, and the filling rate in each region is adjusted for this purpose. Alternatively, the first R1 and second R2 regions may be made of different materials constituting the magnetic particles, thereby adjusting the magnetic permeability. Specifically, the coupling control unit 130 includes an Fe-based alloy, and the Fe-based alloy included in the first region R1 and the Fe-based alloy included in the second region R2 may have different compositions. In this case, the Fe-based alloy included in the first region R1 may have a higher Fe content than the Fe-based alloy included in the second region R2, and the Fe content may be in wt%. In addition, considering that Si may affect the magnetic permeability in addition to Fe, the Si content may be adjusted together with or independently of Fe. For example, the Fe-based alloy included in the coupling control unit 130 may be an Fe-Si-based alloy, and the Fe-Si-based alloy included in the first region R1 may have a higher Si content than the Fe-Si-based alloy included in the second region R2. Specifically, the Si content in the Fe-Si alloy included in the first region R1 may be 6.5 wt% or more, and the Si content in the Fe-Si alloy included in the second region R2 may be less than 6.5 wt%. More specifically, the Si content in the Fe-Si alloy included in the second region R2 may be 1 wt% or more and 5 wt% or less. In addition, when the Fe-based alloy included in the first region R1 and the Fe-based alloy included in the second region R2 have different compositions, the types of elements included therein may be different from each other. For example, an element included in the Fe-based alloy in the first region R1 may not be included in the Fe-based alloy in the second region R2, and vice versa.

[0052] Meanwhile, unlike the previous embodiment, the second region R2 may be realized in a sheet shape rather than magnetic particles in the coupling adjustment part 130. That is, the second region R2 may include a magnetic sheet, where the magnetic sheet may include ferrite. In this case, the first region R1 may include magnetic particles formed of an Fe-based alloy having a relatively higher magnetic permeability than ferrite.

[0053] Hereinafter, an embodiment in which the specific form of the coil is different from the previous embodiment will be described. Without any specific description, all of the previous embodiments can be applied to the following second and third embodiments. First, in the case of the second embodiment shown in Figs. 12 to 14, the coil device 200 includes a main body 210, a first coil 221, a second coil 222, a coupling adjuster 230, a first external electrode 241, a second external electrode 242, a third external electrode 243, and a fourth external electrode 244, and the first coil 221 and the second coil 222 are realized as an array-shaped inductor in which they are magnetically coupled. Here, the coupling adjuster 230 includes a first region R1 and a second region R2 surrounding the first region R1 in a lateral direction, and the first region R1 and the second region R2 are realized in a form having different magnetic permeability from each other, so that the degree of coupling between the first coil 221 and the second coil 222 can be appropriately adjusted.

[0054] As a structure different from the previous embodiment, in this embodiment, the first coil 221 and the second coil 222 each have multiple coil layers. Specifically, the first coil unit includes a plurality of coil layers 221C1 and 221C2. An insulating layer 221D may be interposed between the plurality of coil layers 221C1 and 221C2, and the plurality of coil layers 221C1 and 221C2 may be connected to each other by conductive vias V1. The first lead-out portion 221A and the second lead-out portion 221B may be disposed on the first coil unit side (upper side based on the drawing) based on the coupling adjustment portion 230. The second coil unit includes a plurality of coil layers 222C1 and 222C2. An insulating layer 222D may be interposed between the plurality of coil layers 222C1 and 222C2, and the plurality of coil layers 222C1 and 222C2 may be connected to each other by conductive vias V2. The third lead-out portion 222A and the fourth lead-out portion 222B may be disposed on the second coil portion side (lower side in the drawing) with respect to the coupling adjustment portion 230.

[0055] 15 and 16, the coil device 300 includes a main body 310, a first coil 321, a second coil 322, a coupling adjuster 330, a first external electrode 341, a second external electrode 342, a third external electrode 343, and a fourth external electrode 344, and is realized as an array-type inductor in which the first coil 321 and the second coil 322 are magnetically coupled. Here, the coupling adjuster 330 includes a first region R1 and a second region R2 surrounding the first region R1 in a lateral direction, and the first region R1 and the second region R2 are realized in a form having different magnetic permeability from each other, so that the degree of coupling between the first coil 321 and the second coil 322 can be appropriately adjusted.

[0056] As a configuration different from the previous embodiment, in this embodiment, a part of the first coil 321 and the second coil 322 have a form in which they are wound alternately around the same winding axis. Specifically, the first coil 321 includes a plurality of first coil layers 321C1, 321C2, a first lead portion 321A, and a second lead portion 321B, and the second coil 322 includes a plurality of second coil layers 322C1, 322C2, a third lead portion 322A, and a fourth lead portion 322B. The coupling adjustment unit 330 is disposed between the plurality of first coil layers 321C1, 321C2 and between the plurality of second coil layers 322C1, 322C2. The first coil layer 321C1 and the second coil layer 322C1 are disposed above the coupling adjustment unit 330, and they may have a structure in which they are wound alternately around a winding axis in the same direction. A first coil layer 321C2 and a second coil layer 322C2 are disposed at a distance below the coupling adjustment part 330 and may be connected to the upper coil layers 321C1 and 322C1 by conductive vias V1 and V2, respectively.

[0057] The present invention is not limited by the above-described embodiments and the accompanying drawings, but is limited by the scope of the appended claims. Therefore, within the scope of the claims, various substitutions, modifications and changes can be made by a person having ordinary knowledge in the art, and these also belong to the scope of the present invention. [Explanation of symbols]

[0058] 100, 200, 300 Coil parts 110 Main unit 121 First coil 122 Second coil 121C First coil section 122C Second coil section 121A First drawer 121B Second drawer 122A 3rd drawer 122B 4th drawer 130 Coupling adjustment part 131, 132 Insulation materials R1 1st area R2 2nd area V1 First conductive via V2 Second conductive via 141 1st external electrode 142 2nd external electrode 143 Third external electrode 144 4th external electrode C1 First Core C2 2nd Core P11, P12, P13, P21 magnetic particles

Claims

1. The main body, a first coil disposed within the body, the first coil including a first coil portion having a winding axis in a first direction, a first lead portion and a second lead portion; a second coil including a second coil portion disposed in the main body, the second coil portion being spaced apart from the first coil portion in the first direction and having a winding axis in the first direction, a third lead portion and a fourth lead portion; a coupling adjustment section disposed between the first coil and the second coil, supporting the first coil and the second coil, the coupling adjustment section including a first region located in at least a part of a region overlapping with a first core of the first coil section and a second core of the second coil section in the first direction, and a second region located in at least a part of a region laterally surrounding the first region, the second region having a different magnetic permeability from the first region; a first external electrode and a second external electrode connected to the first extension portion and the second extension portion, respectively; a third external electrode connected to the third lead portion and a fourth external electrode connected to the fourth lead portion, respectively.

2. The coil component according to claim 1 , wherein the first coil portion and the second coil portion are respectively disposed on a first surface and a second surface opposed to each other in the second region of the coupling adjustment portion.

3. The coil component according to claim 1 , wherein the second region extends along a side surface of the main body.

4. The coil component according to claim 1 , wherein the second region is disposed in an outer region of the first coil portion and the second coil portion.

5. The coil component according to claim 1 , wherein the second region is laterally surrounded by the main body.

6. The coil component according to claim 1 , wherein the first region extends to a region where the first coil portion and the second coil portion overlap in the first direction.

7. The coil component according to claim 1 , wherein the second region extends in a direction in which a first core of the first coil portion and a second core of the second coil portion are located.

8. The coil component of claim 1 , wherein the first region forms a unitary structure with the body.

9. The coil component according to claim 1 , wherein the second region has a lower magnetic permeability than the first region.

10. The coil component according to claim 9 , wherein the first region has a higher filling rate of magnetic particles than the second region.

11. The coil component according to claim 10 , wherein the first region contains two or more types of magnetic particles having different D50 sizes.

12. The coil component according to claim 1 , wherein the second region includes a magnetic sheet.

13. The coil component according to claim 12 , wherein the magnetic sheet includes ferrite.

14. the first lead-out portion is disposed at the same level as the first coil portion, and the second lead-out portion is disposed at the same level as the second coil portion, The coil component according to claim 1 , wherein the third lead portion is disposed at the same level as the second coil portion, and the fourth lead portion is disposed at the same level as the first coil portion.

15. the first coil portion includes a plurality of coil layers, and the first lead-out portion and the second lead-out portion are disposed on a side of the first coil portion with respect to the coupling adjustment portion; 14. The coil component according to claim 1, wherein the second coil portion includes a plurality of coil layers, and the third lead portion and the fourth lead portion are arranged on the second coil portion side with respect to the coupling adjustment portion.

16. The coil component according to claim 1 , wherein a coupling coefficient between the first coil and the second coil has an absolute value of not less than 0.495 and less than 0.

605.

17. The main body, a first coil disposed within the body, the first coil including a first coil portion having a winding axis in a first direction, a first lead portion and a second lead portion; a second coil including a second coil portion disposed in the main body, the second coil portion being spaced apart from the first coil portion in the first direction and having a winding axis in the first direction, a third lead portion and a fourth lead portion; a coupling adjustment section disposed between the first coil and the second coil, the coupling adjustment section including a first region located in at least a portion of a region overlapping with a first core of the first coil section and a second core of the second coil section in the first direction, and a second region located in at least a portion of a region laterally surrounding the first region; a first external electrode and a second external electrode connected to the first extension portion and the second extension portion, respectively; a third external electrode connected to the third extension portion and a fourth external electrode connected to the fourth extension portion, The coupling adjustment portion includes an Fe-based alloy, and the Fe-based alloy included in the first region and the Fe-based alloy included in the second region have different compositions.

18. The coil component according to claim 17 , wherein the Fe-based alloy contained in the first region has a higher Fe content than the Fe-based alloy contained in the second region.

19. The coil component according to claim 17, wherein the Fe-based alloy is an Fe-Si-based alloy, and the Fe-Si-based alloy contained in the first region has a higher Si content than the Fe-Si-based alloy contained in the second region.

20. The coil component according to claim 19, wherein the Si content in the Fe-Si alloy contained in the first region is 6.5 wt % or more, and the Si content in the Fe-Si alloy contained in the second region is less than 6.5 wt %.

21. The coil component according to claim 20, wherein the Si content in the Fe-Si system contained in the second region is 1 wt % or more and 5 wt % or less.

22. The main body, a first coil including a plurality of first coil layers disposed within the body and having a winding axis in a first direction, a first lead portion and a second lead portion; a second coil including a plurality of second coil layers disposed within the body and having a winding axis in the first direction, a third lead portion, and a fourth lead portion; a coupling adjustment section including a first region disposed between the plurality of first coil layers and between the plurality of second coil layers, the first region being located in at least a portion of a region overlapping with a first core of the first coil and a second core of the second coil in the first direction, and a second region being located in at least a portion of a region laterally surrounding the first region, the second region having a different magnetic permeability from the first region; a first external electrode and a second external electrode connected to the first extension portion and the second extension portion, respectively; a third external electrode connected to the third lead portion and a fourth external electrode connected to the fourth lead portion, respectively.

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