Coil component

Abstract

The invention provides a coil assembly. According to one aspect of the present disclosure, the coil component includes: a body including a first surface and a second surface opposite to each other in a first direction; and a coil disposed in the body and including a coil pattern and a lead-out portion extending from the coil pattern, in which the coil pattern is divided into a first region in which the lead-out portion is disposed and a second region in which the lead-out portion is not disposed with respect to a center line perpendicular to the first direction and passing through a center of the coil pattern, and wherein an outermost turn of the second region includes a plurality of corner portions and a first connecting portion connecting the plurality of corner portions, and a length of the first connecting portion is shorter than a length of each of the corner portions.

Description

[0001] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0097947 filed on July 27, 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] An inductor, a type of coil component, may be a typical passive electronic component used in electronic devices along with resistors and capacitors.

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

[0005] In a miniaturized coil component, since parasitic capacitance (Cp) is formed between the outer electrode and the coil, the self-resonant frequency (SRF) may be reduced. When the spacing distance between the outer electrode and the coil is increased to increase the SRF, the area of ​​the central core may be reduced and the saturation current (Isat) characteristics may be deteriorated.

[0006] Therefore, there is a need for a coil structure that can maintain the area of ​​the central core while increasing the separation distance between the outer electrodes and the coil. Summary of the invention

[0007] An aspect of the present disclosure is to increase a self-resonant frequency (SRF) by increasing a separation distance between an outer electrode and a coil.

[0008] Another aspect of the present disclosure is to prevent deterioration of saturation current (Isat) characteristics by increasing a separation distance between an outer electrode and a coil and maintaining or minimizing an area of ​​a central core.

[0009] According to one aspect of the present disclosure, a coil component includes: a main body, including a first surface and a second surface opposite to each other in a first direction and a third surface and a fourth surface opposite to each other in a second direction perpendicular to the first direction; a coil, arranged in the main body and including a coil pattern having at least one turn and a lead-out portion extending from an outer end of the coil pattern to the first surface or the second surface; and an external electrode, arranged on the main body and connected to the lead-out portion, wherein, on a cross section perpendicular to a winding axis of the coil pattern, the coil pattern is divided into a first area where the lead-out portion is provided and a second area where the lead-out portion is not provided, relative to a center line perpendicular to the first direction and passing through the center of the coil pattern, and wherein the outermost turn of the second area includes a plurality of corner portions having a quadrant arc shape and a first connecting portion having a straight line shape connecting the plurality of corner portions to each other, and the length of the first connecting portion is shorter than the length of each of the plurality of corner portions.

[0010] According to another aspect of the present disclosure, a coil component includes: a coil, including a coil pattern having at least one turn and a lead-out portion extending from an outer end of the coil pattern, the coil pattern being divided into a first area where the lead-out portion is provided and a second area where the lead-out portion is not provided, the second area including a first curved corner portion, a first straight line connection portion, and a second curved corner portion connected to each other, wherein the length of the first straight line connection portion is shorter than the length of the first curved corner portion and the length of the second curved corner portion; a main body, in which the coil is embedded; and an external electrode, provided on opposite end surfaces of the main body and connected to the lead-out portion, wherein the first straight line connection portion is provided to be parallel to an end surface of the end surface of the main body that is closest to the first straight line connection portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other aspects, features and advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which: Figure 1 is a perspective view showing a coil component according to a first embodiment of the present disclosure; Figure 2 yes Figure 1 Plan view and partial enlarged view in the figure; Figure 3 It is shown Figure 1 A diagram of an inner corner and a quadrant area between an extension line of a boundary between a corner portion and a first connecting portion and an extension line of a boundary between a corner portion and a second connecting portion in a plan view; Figure 4 It is along Figure 1 A cross-sectional view taken along line II' in FIG. Figure 5It is along Figure 1 A cross-sectional view taken along line II-II'; Figure 6 FIG. 1 is a diagram showing a coil component according to a second embodiment of the present disclosure. Figure 2 The corresponding floor plan; Figure 7 FIG. 2 is a diagram showing a coil component according to a third embodiment of the present disclosure. Figure 4 The corresponding LT cross-section; Figure 8 FIG. 2 is a diagram showing a coil component according to a third embodiment of the present disclosure. Figure 5 Corresponding WT cross-section; Fig. 9 is a graph showing SRF characteristics of the coil component according to the first embodiment of the present disclosure; Fig.10 FIG. 1 is a diagram showing a coil component according to a first comparative example not including a first connection portion. Figure 2 The corresponding floor plan; Fig.11 is a graph showing SRF characteristics of a coil component according to a first comparative example; Fig.12 FIG. 1 is a diagram showing a coil component according to a second comparative example not including a first connection portion. Fig.10 the corresponding floor plan; and Fig.13 is a graph of SRF characteristics of a coil component according to a second comparative example. DETAILED DESCRIPTION

[0012] Hereinafter, embodiments of the present disclosure will be described as follows with reference to the accompanying drawings.

[0013] However, the present disclosure can be illustrated in many different forms and should not be construed as being limited to the specific embodiments set forth herein. Unless the context has a significantly different meaning, the expression used in the singular includes the expression of the plural. The terms "comprise", "include", "be constructed as", etc. of the specification are used to indicate the presence of features, quantities, steps, operations, elements, parts, or combinations thereof, and do not exclude the possibility of combining or adding one or more features, quantities, steps, operations, elements, parts, or combinations thereof. In addition, the expression that the element is set "on..." may indicate that the element may be set above or below the target portion, and does not necessarily indicate that the element is set above the target portion in the direction of gravity.

[0014] It will be understood that when an element is “coupled to another element” or “connected to another element”, the element may be directly coupled to another element and there may be intervening elements between the element and the other element. On the contrary, it will be understood that when an element is “directly coupled to another element” or “directly connected to another element”, there are no intervening elements between the element and the other element.

[0015] For example, structures, shapes, and sizes described as examples in the embodiments in the present disclosure may be implemented in another exemplary embodiment without departing from the spirit and scope of the present disclosure.

[0016] In the drawings, L(1) may be defined as a first direction or a length direction, W(2) may be defined as a second direction or a width direction, and T(3) may be defined as a third direction or a thickness direction.

[0017] In the accompanying drawings, the same elements will be denoted by the same reference numerals. In addition, redundant descriptions and detailed descriptions of known functions and elements that may unnecessarily obscure the gist of the present disclosure will not be provided.

[0018] Various types of electronic components are used in electronic devices, and various types of coil components may be appropriately used between these electronic components for the purpose of removing noise.

[0019] That is, in electronic devices, the coil component can be used as a power inductor, a high-frequency inductor, a general magnetic bead, a high-frequency magnetic bead (for example, a magnetic bead suitable for a GHz band), a common mode filter, and the like.

[0020] First embodiment Figure 1 is a perspective view showing a coil component according to a first embodiment. Figure 2 yes Figure 1 The plan view and partial enlargement view in. Figure 3 It is shown Figure 1 An illustration of the inner corner and quadrant area between an extension line of a boundary between a corner portion and a first connecting portion and an extension line of a boundary between a corner portion and a second connecting portion in a plan view in FIG. Figure 4 It is along Figure 1 A cross-sectional view taken along line II' in FIG. Figure 5 It is along Figure 1 A cross-sectional view taken along line II-II'.

[0021] In order to more clearly illustrate the combination between components, an insulating layer that may be applied to the body 100 of the embodiment is not shown. Figure 2 and Figure 3 , the outer electrodes 400 and 500 are not shown.

[0022] Reference Figures 1 to 5 , the coil component 1000 according to the first embodiment may include a body 100 , a support member 200 , a coil 300 , and external electrodes 400 and 500 .

[0023] The coil component 1000 according to the embodiment may include first connection portions 311 a and 312 a having a straight line shape in regions of the coil patterns 311 and 312 disposed opposite to the lead-out portions 331 and 332 .

[0024] The first connection portion 311a may connect the plurality of corner portions 311c having a quadrant arc shape to each other, the first connection portion 312a may connect the plurality of corner portions 312c having a quadrant arc shape to each other, the first connection portions 311a and 312a may be arranged along the second direction W, and may be spaced apart from the surfaces 101 and 102 of the adjacent body 100 at a constant spacing distance d1.

[0025] Since the coil component according to the embodiment may include the first connection portions 311a and 312a having a straight line shape in the coil patterns 311 and 312, the spacing distance d1 between the coil patterns 311 and 312 and the external electrodes 400 and 500 provided on the body 100 may be widened compared to the first connection portions 311a and 312a having a curved shape, and thus, the parasitic capacitance Cp between the coil patterns 311 and 312 and the external electrodes 400 and 500 may be reduced, and the self-resonant frequency (SRF) may be increased.

[0026] In addition, since the coil component according to the embodiment may include the first connection portions 311a and 312a having a straight line shape in the coil patterns 311 and 312, the reduction in the area of ​​the core 110 disposed in the center of the coil patterns 311 and 312 can be reduced compared to the first connection portions 311a and 312a having a curved shape, and thus, the degradation of the saturation current (Isat) characteristics can be prevented.

[0027] In the following description, main components included in the coil component 1000 according to the embodiment will be described in more detail.

[0028] In an embodiment, the body 100 may form an outer shape of the coil component 1000 , and the coil 300 and the support member 200 may be embedded in the body 100 .

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

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

[0031] The body 100 may be formed so that the coil component in which the external electrodes 400 and 500 are formed may have a length of 2.5 mm, a width of 2.0 mm, and a thickness of 0.8 mm, a length of 2.0 mm, a width of 1.2 mm, and a thickness of 1.0 mm, a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.6 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.6 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.4 mm, a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm, a length of 1.0 mm, a width of 0.7 mm, and a thickness of 0.65 mm, a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.65 mm, or a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.5 mm, but the embodiment is not limited thereto. Since the above exemplary dimensions of the length, width, and thickness of the coil component 1000 may refer to dimensions that do not reflect process errors, dimensions within a range identified as process errors may correspond to the above exemplary dimensions.

[0032] The length of the coil component 1000 may be the maximum value among the sizes of the multiple line segments connecting the two outermost boundary lines of the coil component 1000 opposite to each other in the length direction L and parallel to the length direction L, based on an optical microscope image or a scanning electron microscope (SEM) image of a cross section in the length direction L-thickness direction T taken from the central portion of the coil component 1000 in the width direction W. Optionally, the length of the coil component 1000 may refer to the minimum value among the sizes of the multiple line segments. Optionally, the length of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the multiple line segments. Here, the multiple line segments parallel to the length direction L may be spaced apart from each other by equal distances in the thickness direction T, but embodiments thereof are not limited thereto.

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

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

[0035] Optionally, each of the length, width, and thickness of the coil assembly 1000 can be measured by a micrometer measurement method. The micrometer measurement method can be performed in the following manner: determine the zero point with a micrometer having metrological repeatability and reproducibility (R&R), insert the coil assembly 1000 in the embodiment between the tips of the micrometer, and measure by rotating the measuring rod of the micrometer. When measuring the length of the coil assembly 1000 by the micrometer measurement method, the length of the coil assembly 1000 may refer to a value measured once, or may refer to an arithmetic mean of values ​​measured multiple times, which may also apply to the width and thickness of the coil assembly 1000.

[0036] The main body 100 may include a magnetic material and a resin. Specifically, the main body 100 may be formed by laminating one or more magnetic composite sheets including a resin and a magnetic material dispersed in the resin, and then curing the magnetic composite sheets. The main body 100 may have a structure other than a structure including a resin and a magnetic material. For example, the main body 100 may be formed using a magnetic material such as ferrite.

[0037] The magnetic material can be ferrite powder or metal magnetic powder.

[0038] The ferrite powder may be, for example, at least one of spinel ferrite (such as Mg-Zn-based ferrite, Mn-Zn-based ferrite, Mn-Mg-based ferrite, Cu-Zn-based ferrite, Mg-Mn-Sr-based ferrite, Ni-Zn-based ferrite), hexagonal ferrite (such as Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite, Ba-Ni-Co-based ferrite), garnet-type ferrite (such as Y-based ferrite) and Li-based ferrite.

[0039] The metal magnetic powder may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metal magnetic powder may be at least one of 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.

[0040] The metal magnetic powder may be amorphous or crystalline. For example, the metal magnetic powder may be Fe-Si-B-Cr based amorphous alloy powder, but the embodiment is not limited thereto.

[0041] Each of the ferrite powder and the metal magnetic powder may have an average diameter of about 0.1 μm to about 30 μm, but the embodiment is not limited thereto.

[0042] The body 100 may include two or more types of magnetic materials dispersed in the resin. Here, the different types of magnetic materials may mean that the magnetic materials dispersed in the resin can be distinguished from each other by at least one of average diameter, composition, crystallinity, and shape.

[0043] The resin may include epoxy resin, polyimide, liquid crystal polymer, etc., alone or in combination, but the embodiment is not limited thereto.

[0044] The body 100 may include a core 110 penetrating the support member 200 and the coil 300. The core 110 may be formed by filling through holes in the support member 200 and the coil 300 with a magnetic composite sheet, but the embodiment is not limited thereto.

[0045] The support member 200 may be provided in the body 100. The support member 200 may be a component that supports the coil 300. The support member 200 may not be included in an embodiment, such as when the coil 300 is a wound coil or has a coreless structure.

[0046] The support member 200 may be formed using an insulating material including a thermosetting insulating resin such as epoxy resin, a thermoplastic insulating resin such as polyimide, or a photosensitive insulating resin, or may be formed using an insulating material formed by impregnating a reinforcing material such as glass fiber or an inorganic filler in the insulating resin. For example, the support member 200 may be formed using an insulating material such as a prepreg, an Ajinomoto build-up film (ABF), FR-4, a bismaleimide triazine (BT) film, and a photosensitive dielectric (PID) film, but embodiments thereof are not limited thereto.

[0047] As the inorganic filler, silicon dioxide (SiO 2 )、Alumina(Al 2 O 3 ), silicon carbide (SiC), barium sulfate (BaSO 4 ), talc, clay, mica powder, aluminum hydroxide (Al(OH) 3 )、Magnesium hydroxide(Mg(OH) 2 ), calcium carbonate (CaCO 3 )、Magnesium carbonate(MgCO 3 ), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO 3 ), barium titanate (BaTiO 3 ) and calcium zirconate (CaZrO 3 )

[0048] When the support member 200 is formed using an insulating material including a reinforcing material, the support member 200 can provide improved rigidity. When the support member 200 is formed using an insulating material not including glass fiber, the support member 200 can be made thicker by reducing the total thickness (representing the thickness of the support member 200 and the coil 300) of the support member 200. Figure 1 The thickness of the component can be easily reduced by forming the support member 200 with a thickness of 0.40 mm (the sum of the dimensions of the coil 300 and the support member 200 in the third direction T). When the support member 200 is formed using an insulating material including a photosensitive insulating resin, the number of processes for forming the coil 300 can be reduced, which can be beneficial for reducing production costs, and a fine via hole 320 can be formed. 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 embodiments thereof are not limited thereto.

[0049] The coil 300 may be disposed on the support member 200. The coil 300 may be embedded in the body 100 and may exhibit characteristics of a coil component. For example, when the coil component 1000 in the embodiment is used as a power inductor, the coil 300 may store an electric field as a magnetic field and maintain an output voltage, thereby stabilizing the power supply of the electronic device.

[0050] The coil 300 may be formed on at least one of two surfaces of the support member 200 facing each other, and may form at least one turn. In an embodiment, the coil 300 may include coil patterns 311 , 312 , a via 320 , and lead-out portions 331 and 332 .

[0051] Reference Figures 1 to 5 , the first coil pattern 311 and the second coil pattern 312 may be respectively disposed on two surfaces of the support member 200 opposite to each other, and may be in the form of a planar spiral that forms at least one turn around the core 110 of the body 100. For example, with respect to Figure 1 In the direction of the first coil pattern 311, the first coil pattern 311 may be disposed on the upper surface of the support member 200 and may form at least one turn around the core 110. The second coil pattern 312 may be disposed on the lower surface of the support member 200 and may form at least one turn around the core 110. The first coil pattern 311 and the second coil pattern 312 may be formed so that the ends of the outermost turns connected to the lead-out portions 331 and 332 may extend toward the first surface 101 and the second surface 102 of the body 100, respectively.

[0052] Reference Figure 2 , on an LW cross section perpendicular to the winding axis of the first coil pattern 311, relative to a center line CL perpendicular to the first direction L and passing through the center of the first coil pattern 311, the first coil pattern 311 may be divided into a first region R1 in which the first lead-out portion 331 is disposed and a second region R2 in which the first lead-out portion 331 is not disposed.

[0053] Hereinafter, the embodiments will be described with respect to the first coil pattern 311 and the second external electrode 500 , and the description may also be applied to the second coil pattern 312 and the first external electrode 400 .

[0054] When relative to Figure 2 When describing the first coil pattern 311 in FIG. 1 , the outermost turn of the portion of the first coil pattern 311 corresponding to the second region R2 may include a plurality of corner portions 311 c having a quadrant arc shape and a first connection portion 311 a having a straight line shape connecting the plurality of corner portions 311 c to each other.

[0055] Reference Figure 1 and Figure 2 The first connection portion 311 a may be disposed along the second direction W and may be disposed parallel to the second surface 102 of the body 100 .

[0056] Here, since the second surface 102 of the body 100 corresponds to a surface on which the second external electrode 500 is disposed, when the first coil pattern 311 includes the first connection portion 311 a having a straight line shape, a constant spacing distance d1 between the first coil pattern 311 and the second external electrode 500 may be ensured.

[0057] Reference Figure 2 The outermost turn of a portion of the first coil pattern 311 corresponding to the second region R2 may further include a second connection portion 311 b disposed along the first direction L and parallel to the third surface 103 or the fourth surface 104 of the body 100 .

[0058] The first connection portion 311 a and / or the second connection portion 311 b may have a straight line shape including a curvature of 0.

[0059] In addition, the first connection portion 311 a and / or the second connection portion 311 b may include an inner surface opposite to the center of the first coil pattern 311 and an outer surface opposite to the inner surface, and the curvature of each of the inner surface and the outer surface may be formed to be zero.

[0060] Here, the curvature of 0 is not limited to an exact straight line shape, and may mean that a curvature close to 0 may be formed including a process error and a position deviation occurring during a manufacturing process and a measurement error.

[0061] The second connection portion 311b may have a straight line shape including a curvature of 0. Here, the curvature of 0 is not limited to an exact straight line shape, and may mean that a curvature close to 0 may be formed including process errors and position deviations occurring during a manufacturing process and measurement errors.

[0062] Reference Figure 3 , an angle θ formed by a conceptual line formed by extending a boundary between the first connection portion 311a and the corner portion 311c and a conceptual line formed by extending a boundary between the second connection portion 311b and the corner portion 311c is at least 80 degrees and does not exceed 100 degrees.

[0063] Here, a conceptual line formed by extending the boundary between the first connection portion 311a and the corner portion 311c and a conceptual line formed by extending the boundary between the second connection portion 311b and the corner portion 311c may ideally form a right angle, but an error of ±10 degrees may be allowed considering process errors and positional deviations occurring during the manufacturing process and measurement errors.

[0064] Reference Figures 1 to 3 , the corner portion 311c may be a component connecting the first connection portion 311a to the second connection portion 311b. That is, one end of the corner portion 311c may be connected to the first connection portion 311a, and the other end of the corner portion 311c may be connected to the second connection portion 311b.

[0065] The corner portion 311 c may have a curved shape including a curvature greater than 0, and may form a turn less than 1 / 4 turn.

[0066] In addition, the corner portion 311 c may include an inner side surface opposite to the center of the first coil pattern 311 and an outer side surface opposite to the inner side surface, and a curvature of at least one of the inner side surface and the outer side surface may be greater than 0.

[0067] Reference Figure 3 , a cross-section perpendicular to the winding axis of the first coil pattern 311 can be divided into quadrant areas formed by a first axis CL1 parallel to the first direction L and passing through the center of the body 100 and a second axis CL2 parallel to the second direction W and passing through the center of the body 100, and the corner portion 311c can be set in a corresponding quadrant area in the quadrant area.

[0068] In addition, the first axis CL1 may be disposed to pass through the first connection portion 311a, and the second axis CL2 may be disposed to pass through the second connection portion 311b. For example, the first axis CL1 may be the center line of the first connection portion 311a, and the second axis CL2 may be the center line of the second connection portion 311b.

[0069] For ease of description, Figures 1 to 3 In the figure, a conceptual boundary line may be displayed between the first connection portion 311a, the corner portion 311c, and the second connection portion 311b and the first connection portion 311a, the corner portion 311c, and the second connection portion 311b may be drawn with different shadows, but the first connection portion 311a, the corner portion 311c, and the second connection portion 311b may correspond to respective areas of the integrated first coil pattern 311.

[0070] In addition, the boundaries between the first connection portion 311 a , the corner portion 311 c , and the second connection portion 311 b may be defined as a conceptual line connecting points where the curvature changes on each of the inner and outer side surfaces.

[0071] In addition, the characteristics of the first connection portion 311a, the corner portion 311c, and the second connection portion 311b have been described with respect to the outermost turn of the first coil pattern 311, but example embodiments thereof are not limited thereto, and as shown in FIG. Figures 1 to 3 As shown in , a plurality of turns (e.g., each of the plurality of turns) of the first coil pattern 311 may include a first connection portion 311a, a corner portion 311c, and a second connection portion 311b. In addition, a plurality of turns (e.g., each of the plurality of turns) of the second coil pattern 312 may include a first connection portion 312a, a corner portion 312c, and a second connection portion 312b.

[0072] Reference Figure 2, the length SW1 of the first connection portion 311a may be shorter than the length C1 of each corner portion 311c.

[0073] Since the first connection portion 311a having a straight shape is formed to be shorter than the corner portion 311c having a curved shape, compared with a case where the first connection portion 311a having a straight shape is longer than the corner portion 311c having a curved shape, when current flows through the first coil pattern 311, magnetic flux can be prevented from concentrating around the corner portion 311c.

[0074] Here, the length SW1 of the first connection portion 311a may refer to, based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-width direction W cross section intercepted from the central portion of the first coil pattern 311 of the coil component 1000 in the thickness direction T, the arithmetic mean of at least three of the sizes of multiple line segments connecting the two end boundaries of the first connection portion 311a in the outermost turn of the first coil pattern 311 appearing in the above image and spaced from each other in the width direction W.

[0075] In addition, the length C1 of the corner portion 311c may refer to a dimension value of a line connecting the center of the line width calculated using an Image J program tool between the two end boundaries of the corner portion 311c in the outermost turn of the first coil pattern 311 appearing on the above image based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-width direction W cross section intercepted from the central portion of the first coil pattern 311 in the thickness direction T of the coil component 1000, but the example embodiment thereof is not limited thereto.

[0076] Reference Figures 1 to 4 , the first lead portion 331 may extend from the first coil pattern 311 to the first surface 101 of the body 100, and the second lead portion 332 may extend from the second coil pattern 312 to the second surface 102 of the body 100. Specifically, the first lead portion 331 may be connected to the outer end of the first coil pattern 311, may extend to the first surface 101 of the body 100, and may be connected to the first external electrode 400. In addition, the second lead portion 332 may be connected to the outer end of the second coil pattern 312, may extend to the second surface 102 of the body 100, and may be connected to the second external electrode 500.

[0077] Reference Figure 5, the coil 300 may further include a via 320 connecting the first coil pattern 311 to the second coil pattern 312. Specifically, the via 320 may connect the inner end of the innermost turn of the first coil pattern 311 and the inner end of the innermost turn of the second coil pattern 312 to each other through the support member 200. Therefore, the signal input to the first external electrode 400 may be output to the second external electrode 500 through the first lead-out portion 331, the first coil pattern 311, the via 320, the second coil pattern 312, and the second lead-out portion 332. Through this structure, the individual components of the coil 300 may be used as a single coil connected between the first external electrode 400 and the second external electrode 500.

[0078] At least one of the coil patterns 311 , 312 , the via 320 , and the lead-out portions 331 and 332 may include at least one conductive layer.

[0079] As an example, when the upper surface (relative to the upper surface of the support member 200) Figure 1 When the first coil pattern 311, the via 320 and the first lead-out portion 331 are formed by plating in the direction of the first coil pattern 311, the via 320 and the first lead-out portion 331, each of the first coil pattern 311, the via 320 and the first lead-out portion 331 may include a seed layer and an electroplating layer. The seed layer may be formed by an electroless plating method or a vapor deposition method such as sputtering. 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 as a conformal film structure in which one electroplating layer is covered by another electroplating layer, or may be formed as a shape in which another electroplating layer is laminated only to one surface of one electroplating layer. The seed layer of the first coil pattern 311, the seed layer of the via 320 and the seed layer of the first lead-out portion 331 may be formed integrally, and no boundary may be formed between them, but the embodiment is not limited thereto. The electroplating layer of the first coil pattern 311, the electroplating layer of the via 320 and the electroplating layer of the first lead-out portion 331 may be formed integrally, and no boundary may be formed between them, but the embodiment is not limited thereto.

[0080] Each of the coil patterns 311 , 312 , the via 320 , and the lead-out portions 331 and 332 may include a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo), or an alloy thereof, but is not limited thereto.

[0081] The external electrode 400 or 500 may be disposed on the first surface 101 or the second surface 102 of the body 100, respectively, and may be connected to the first lead-out portion 331 or the second lead-out portion 332. Specifically, the first external electrode 400 may be disposed on the first surface 101 of the body 100 and may be in contact with and connected to the first lead-out portion 331. In addition, the second external electrode 500 may be disposed on the second surface 102 of the body 100 and may be in contact with and connected to the second lead-out portion 332.

[0082] When the coil component 1000 according to the embodiment is mounted on a printed circuit board, the external electrodes 400 and 500 may electrically connect the coil component 1000 to the printed circuit board. For example, the external electrodes 400 and 500 located on the first surface 101 and the second surface 102 of the body 100 and spaced apart from each other and the connection portions of the printed circuit board may be electrically connected to each other.

[0083] The external electrodes 400 and 500 may be formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Cr), titanium (Ti), or alloys thereof, but example embodiments thereof are not limited thereto.

[0084] A plurality of external electrodes 400 and a plurality of external electrodes 500 may be formed. As an example, the first external electrode 400 may include a first layer in contact with the first lead-out portion 331 and a second layer disposed on the first layer. Here, the first layer may be a conductive resin layer including conductive powder (including at least one of copper (Cu) and silver (Ag)) and an insulating resin, or may be a copper (Cu) plating layer. The second layer may have a double-layer structure of a nickel (Ni) plating layer and a tin (Sn) plating layer.

[0085] Reference Figure 4 and Figure 5 , the insulating film IF may be provided between the coil 300 and the body 100 to cover the coil 300. The insulating film IF may be formed along the surface of the support member 200 and the surface of the coil 300. The insulating film IF may be provided to insulate the coil 300 from the body 100, and may include a known insulating material such as polyparaxylene, but example embodiments thereof are not limited thereto. The insulating film IF may be formed by a method such as vapor deposition, but example embodiments thereof are not limited thereto, and the insulating film IF may be formed by laminating insulating films on both surfaces of the support member 200.

[0086] The coil component 1000 according to the embodiment may further include an insulating layer disposed on the third surface 103 , the fourth surface 104 , the fifth surface 105 , and the sixth surface 106 of the body 100 in regions other than regions in which the external electrodes 400 and 500 are disposed.

[0087] For example, the insulating layer may be formed by applying and curing an insulating material including an insulating resin to the surface of the body 100. The insulating layer may further include at least one of a thermoplastic resin (such as polystyrene resin, vinyl acetate resin, polyester resin, polyethylene resin, polypropylene resin, polyamide resin, rubber resin, and acrylic resin), a thermosetting resin (such as phenolic resin, epoxy resin, polyurethane resin, melamine resin, alkyd resin, etc.), and a photosensitive resin.

[0088] Second embodiment Figure 6 FIG. 1 is a diagram showing a coil component according to a second embodiment. Figure 2 The corresponding floor plan.

[0089] Will Figure 6 and Figure 2 In comparison, the coil component 2000 according to the embodiment may have a length SW2 of the first connection portion 311a, a length C2 of the corner portion 311c, and a spacing distance d2 between the second surface 102 of the body 100 and the first connection portion 311a different from those of the first embodiment.

[0090] Therefore, when describing this embodiment, only the length SW2 of the first connection portion 311a, the length C2 of the corner portion 311c, and the spacing distance d2 between the second surface 102 of the body 100 and the first connection portion 311a that are different from the first embodiment will be described. The description in the first embodiment can be applied to other components.

[0091] Reference Figure 6 , the length SW2 of the first connection portion 311 a of the coil component 2000 according to the embodiment may be formed to be longer than the length SW1 of the first connection portion 311 a of the first embodiment.

[0092] In addition, the length C2 of the corner portion 311 c of the coil component 2000 according to the embodiment may be shorter than the length C1 of the corner portion 311 c of the first embodiment.

[0093] However, similar to the first embodiment, the length SW2 of the first connection portion 311 a may be shorter than the length C2 of the corner portion 311 c .

[0094] In the coil component 2000 according to the embodiment, the spacing distance d2 between the second surface 102 of the body 100 on which the second external electrode 500 is disposed and the coil pattern 311 may be increased compared to the first embodiment, thereby improving the effects of reducing the parasitic capacitance Cp and increasing the self-resonant frequency (SRF).

[0095] In addition, the length SW2 of the first connection portion 311a having a straight shape can be increased, the length C2 of the corner portion 311c can be reduced, and the length SL1 of the second connection portion 311b can be maintained, thereby offsetting the reduction in the area of ​​the central core caused by increasing the spacing distance d2 between the second surface 102 of the body 100 and the coil pattern 311.

[0096] Therefore, the coil component 2000 according to the embodiment may maintain the saturation current (Isat) characteristic while increasing the self-resonance frequency (SRF).

[0097] Third embodiment Figure 7 FIG. 2 is a diagram showing a coil component according to a third embodiment of the present disclosure. Figure 4 Corresponding LT cross-section. Figure 8 FIG. 2 is a diagram showing a coil component according to a third embodiment of the present disclosure. Figure 5 Corresponding WT cross-section.

[0098] Will Figure 7 and Figure 8 and Figure 4 and Figure 5 In comparison, when the support member 200 is not disposed between the first coil pattern 311 and the second coil pattern 312 , the distance between the first coil pattern 311 and the second coil pattern 312 may be different.

[0099] Therefore, in the third embodiment, the supporting member 200 is not disposed between the first coil pattern 311 and the second coil pattern 312, which is different from the first embodiment, and a description will be given of a distance between the first coil pattern 311 and the second coil pattern 312. The description in the first embodiment can be applied to other components.

[0100] Reference Figure 7 and Figure 8 , the coil 300 may be integrally covered and supported by the insulating film IF. The embodiment may correspond to a coreless structure in which the support member 200 is not provided, and may be implemented by providing the coil 300 on the support member 200, completely removing the support member 200 and forming the insulating film IF.

[0101] Reference Figure 8 , the first coil pattern 311 and the second coil pattern 312 may be connected to each other through a via hole 320 penetrating the insulating film IF.

[0102] In embodiments, the insulating film IF may include parylene or polyimide, and may be formed by a method such as vapor deposition or film lamination, but example embodiments thereof are not limited thereto.

[0103] Since the insulating film IF can be formed to have a thickness smaller than that of the supporting member 200, in the coil component 3000 according to the embodiment, the distance between the first coil pattern 311 and the second coil pattern 312 can reduce the space occupied by the supporting member 200 compared to the first embodiment, and therefore, space for filling the magnetic material can be ensured in the body 100 of a limited size, thereby increasing the effective volume.

[0104] Therefore, the inductance characteristics of the coil component 3000 according to the embodiment may be improved as the effective volume increases.

[0105] Comparison of SRF improvement effects Fig. 9 is a graph showing the SRF characteristics of the coil component according to the first embodiment. Fig.10 FIG. 1 is a diagram showing a coil component according to a first comparative example not including a first connection portion. Figure 2 The corresponding floor plan. Fig.11 is a graph of SRF characteristics of a coil component according to a first comparative example. Fig.12 FIG. 1 is a diagram showing a coil component according to a second comparative example not including a first connection portion. Fig.10 The corresponding floor plan. Fig.13 is a graph of SRF characteristics of a coil component according to a second comparative example.

[0106] Fig. 9 Corresponding to a graph showing inductance variation according to frequency variation applied to the coil component 1000 according to the first embodiment, a sample used in the experiment may be the coil component 1000 having a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm.

[0107] In the sample, the spacing distance d1 between the second external electrode 500 and the first coil pattern 311 may be 120 μm, the spacing distance between the first coil pattern 311 and the third surface 103 of the body 100 may be 70 μm, and the area of ​​the central core may be 0.3054 mm 2 .

[0108] Reference Fig. 9 , when the frequency of the coil component 1000 according to the first embodiment is 157.5300 MHz, the inductance is almost 0, and thus the SRF is measured to be 157.5300 MHz.

[0109] Reference Fig.10 Unlike the coil component 1000 according to the first embodiment, the coil component 10 according to the first comparative example may not include the first connection portion 311a having a straight line shape, and therefore, the spacing distance d0 between the first coil pattern 311 and the second surface 102 of the body 100 may be shorter than that in the first embodiment.

[0110] The sample used in the experiment is a coil component 10 having a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm, and the spacing distance d0 between the second external electrode 500 and the first coil pattern 311 in the sample is 80 μm. The spacing distance between the first coil pattern 311 and the third surface 103 of the body 100 is 70 μm, and the area of ​​the central core is 0.2961 mm 2 .

[0111] Reference Fig.11 , when the frequency of the coil component 10 according to the first comparative example is 141.9700 MHz, the inductance is 0, and thus the SRF is measured to be 141.9700 MHz.

[0112] As shown in the above results, in the coil component 1000 according to the first embodiment, the spacing distance d1 between the first coil pattern 311 and the second surface 102 of the body 100 on which the second external electrode 500 is disposed is widened by the first connection portion 311a having a straight line shape, so that the parasitic capacitance is reduced and the SRF is increased by 10.96%.

[0113] Reference Fig.12 , when compared with the coil component 1000 according to the first embodiment, the coil component 20 according to the second comparative example may not include the first connection portion 311a having a straight line shape, but the spacing distance d1 between the first coil pattern 311 and the second surface 102 of the body 100 may be formed to be the same as the spacing distance d1 in the first embodiment.

[0114] The sample used in the test is a coil component 20 having a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm, and the spacing distance d1 between the second external electrode 500 and the first coil pattern 311 in the sample is 120 μm (the same as the spacing distance d1 in the first embodiment), the spacing distance between the first coil pattern 311 and the third surface 103 of the body 100 is 70 μm, and the area of ​​the central core is 0.2536 mm 2 .

[0115] Here, with respect to the area of ​​the central core, the coil component 20 according to the second comparative example does not include the first connecting portion 311a having a straight line shape, and when the spacing distance d1 between the first coil pattern 311 and the second surface 102 of the body 100 is the same as the spacing distance d1 in the coil component 1000 according to the first embodiment, the area of ​​the central core is smaller.

[0116] The Isat value of the coil component 1000 according to the first embodiment is 4.0 A, whereas the Isat value of the coil component 20 according to the second comparative example is measured to be 3.7625 A, which is considered to be a side effect due to the reduction in the area of ​​the central core.

[0117] Reference Fig.13 , when the frequency of the coil component 20 according to the second comparative example is 155.0700 MHz, the inductance is 0, and thus the SRF is measured to be 155.0700 MHz.

[0118] As shown in the above results, in the case of the coil component 1000 according to the first embodiment, compared with the coil component 20 according to the second comparative example which does not have the first connecting portion 311a including a straight line shape, the spacing distance d1 between the first coil pattern 311 and the second surface 102 of the body 100 is similar, and the SRF is increased by 1.59%.

[0119] In particular, the area of ​​the central core of the coil component 1000 according to the first embodiment is increased due to the first connection portion 311 a having a straight line shape, so that the saturation current (Isat) is increased by 6.31% compared to the coil component 20 according to the second comparative example.

[0120] In summary, in the coil component 1000 according to the first embodiment, it is confirmed that the SRF characteristic is improved while the saturation current (Isat) characteristic is not deteriorated, compared with the first comparative example and the second comparative example.

[0121] According to the above-described embodiments, when the spacing distance between the outer electrode and the coil increases, the self-resonant frequency (SRF) of the coil component may increase.

[0122] According to another aspect, when the SRF increases, the area of ​​the central core of the coil may be maintained or may be minimally reduced, and degradation of saturation current (Isat) characteristics of the coil component may be reduced.

[0123] While embodiments have been shown and described above, it will be readily apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: A body including a first surface and a second surface opposite to each other in a first direction and a third surface and a fourth surface opposite to each other in a second direction perpendicular to the first direction; a coil disposed in the body and including a coil pattern having at least one turn and a lead-out portion extending from an outer end of the coil pattern to the first surface or the second surface; as well as an external electrode, disposed on the main body and connected to the lead-out portion, wherein, on a cross section perpendicular to the winding axis of the coil pattern, the coil pattern is divided into a first region where the lead-out portion is provided and a second region where the lead-out portion is not provided, relative to a center line perpendicular to the first direction and passing through the center of the coil pattern, and The outermost turn of the second region includes at least two curved corner portions and a first connection portion having a straight line shape connecting adjacent corner portions to each other, and a length of the first connection portion is shorter than a length of each of the at least two curved corner portions.

2. The coil assembly according to claim 1, wherein: The first connection portion is disposed along the second direction and is parallel to the first surface or the second surface of the main body adjacent to the first connection portion.

3. The coil assembly according to claim 1, wherein: The outermost turn of a portion of the coil pattern corresponding to the second region further includes a second connection portion disposed along the first direction and parallel to the third surface or the fourth surface of the body.

4. The coil assembly according to claim 3, wherein: An angle formed by a conceptual line formed by extending a boundary between the first connection portion and one of the at least two curved corner portions and a conceptual line formed by extending a boundary between the second connection portion and the one of the at least two curved corner portions is in the range of 80 degrees to 100 degrees.

5. The coil assembly according to claim 3, wherein: One of the at least two curved corner portions connects the first connection portion to the second connection portion.

6. The coil assembly according to claim 3, in, A cross section perpendicular to a winding axis of the coil pattern is divided into quadrant regions formed by a first axis parallel to the first direction and passing through a center of the body and a second axis parallel to the second direction and passing through the center of the body, and Wherein, the at least two curved corner portions are respectively arranged in corresponding quadrant areas of the quadrant areas.

7. The coil assembly according to claim 6, wherein: The first axis passes through the first connecting portion.

8. The coil assembly according to claim 6, wherein: The second axis passes through the second connecting portion.

9. The coil assembly according to claim 1, wherein: The curvature of the first connecting portion is 0.

10. The coil assembly according to claim 1, wherein: The curvature of the at least two curved corner portions is greater than zero.

11. The coil assembly according to claim 3, wherein: The curvature of the second connecting portion is 0.

12. The coil assembly according to claim 3, wherein: Each of the at least two curved corner portions forms a turn that is less than 1 / 4 turn.

13. The coil assembly according to claim 1, in, The first connection portion includes an inner side surface facing the center of the coil pattern and an outer side surface opposite to the inner side surface, and Wherein, the curvature of each of the inner surface and the outer surface is 0.

14. The coil assembly according to claim 1, in, The corner portion includes an inner side surface facing the center of the coil pattern and an outer side surface opposite to the inner side surface, and Wherein, a curvature of at least one of the inner surface and the outer surface is greater than 0.

15. The coil assembly according to claim 3, in, The second connection portion includes an inner side surface facing the center of the coil pattern and an outer side surface opposite to the inner side surface, and Wherein, the curvature of each of the inner surface and the outer surface is 0.

16. The coil assembly according to claim 3, wherein: The coil pattern has a plurality of turns, and each turn includes the first connection portion.

17. The coil assembly according to claim 1, further comprising: a supporting member, disposed in the main body, Wherein, the coil is arranged on the supporting member.

18. The coil assembly according to claim 17, in, The support member includes a first surface and a second surface opposite to each other, and Wherein, the coil includes: a first coil pattern, which is arranged on the first surface of the supporting member; a first lead-out portion, which extends from the first coil pattern to the first surface; a second coil pattern, which is arranged on the second surface of the supporting member; a second lead-out portion, which extends from the second coil pattern to the second surface; and a via, which connects the inner end of the first coil pattern to the inner end of the second coil pattern.

19. The coil assembly according to claim 18, wherein: Each of the first coil pattern and the second coil pattern includes the at least two bent corner portions and the first connection portion.

20. A coil assembly, comprising: A coil, comprising a coil pattern having at least one turn and a lead-out portion extending from an outer end of the coil pattern, the coil pattern being divided into a first region where the lead-out portion is provided and a second region where the lead-out portion is not provided, the second region comprising a first curved corner portion, a first straight connecting portion, and a second curved corner portion connected to each other, wherein a length of the first straight connecting portion is shorter than a length of the first curved corner portion and a length of the second curved corner portion; a main body, wherein the coil is embedded in the main body; external electrodes, provided on opposite end surfaces of the body and connected to the lead-out portion, The first straight connecting portion is arranged to be parallel to an end surface of the end surface of the main body that is closest to the first straight connecting portion.

21. The coil assembly according to claim 20, further comprising: A second straight connecting portion is arranged to be parallel to one of the side surfaces of the main body, wherein the first straight connecting portion, the second curved corner portion and the second straight connecting portion are connected to each other.

22. The coil assembly according to claim 20, wherein: A cross section perpendicular to the winding axis of the coil pattern is divided into quadrant areas formed by a first axis connecting the end surfaces and passing through the center of the body and a second axis connecting the side surfaces of the body and passing through the center of the body, and Wherein, the first curved corner portion and the second curved corner portion are respectively arranged in corresponding quadrant areas of the quadrant areas.

23. The coil assembly according to claim 20, further comprising a support member disposed in the body, in, The coil is disposed on the support member, and Wherein, the coil pattern comprises: a first coil pattern having a first lead-out portion and disposed on a first surface of the support member, the first lead-out portion being connected to one of the external electrodes, a second coil pattern having a second lead-out portion connected to another of the external electrodes and disposed on a second surface of the support member opposite to the first surface, The inner end of the first coil pattern and the inner end of the second coil pattern are connected through a via hole penetrating the supporting member.

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