Coil component

Abstract

To provide a coil component that increases the spacing between an external electrode and a coil and increases an SRF.SOLUTION: A coil component includes a coil pattern and lead-out portion 331 having at least one turn, and an external electrode connected to the coil lead-out portion, and is divided into a first region R1 in which the lead-out portion is arranged and a second region R2 in which the lead-out portion is not arranged, on the basis of a center line CL passing through the center of the coil pattern, and the outermost turn of the second region R2 includes a plurality of corner portions 331c having a quadrantal arc shape and a straight-line first connecting portion 311a connecting the plurality of corner portions 331c, and the length of the first connecting portion 311a is shorter than the length of each of the corner portions 331c.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] An inductor, which is a type of coil component, is a typical passive electronic component used in electronic devices along with resistors and capacitors.

[0003] As electronic devices become increasingly more powerful and smaller, the number of electronic components used in the electronic devices is also increasing and becoming smaller.

[0004] The miniaturized coil components reduce the parasitic capacitance (C p As the external electrode is formed, the self-resonant frequency (SRF) may decrease. However, if the distance between the external electrode and the coil is increased to increase the SRF, the central core area may decrease, which may result in a decrease in the saturation current (Isat) characteristics.

[0005] Therefore, there is a need for a coil structure in which the central core area is maintained while increasing the spacing between the outer electrodes and the coil. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-076700 A Summary of the Invention [Problem to be solved by the invention]

[0007] One objective of embodiments of the present invention is to increase the Self-Resonant Frequency (SRF) by increasing the spacing between the external electrode and the coil.

[0008] Another objective of embodiments of the present invention is to prevent degradation of saturation current (Isat) characteristics by increasing the spacing between the external electrodes and the coil while maintaining or minimizing the area of ​​the central core. [Means for solving the problem]

[0009] According to one aspect of the present invention, there is provided a coil component including: a main body including first and second surfaces facing each other in a first direction, and third and fourth surfaces facing each other in a second direction perpendicular to the first direction; a coil pattern disposed within the main body and having at least one turn; a coil including an extension portion extending from an outer end of the coil pattern to the first surface or the second surface; and an external electrode disposed on the main body and connected to the coil, wherein, on a cross section perpendicular to a winding axis of the coil pattern, the coil pattern is perpendicular to the first direction and is divided into a first region in which the extension portion is disposed and a second region in which the extension portion is not disposed, based on a center line passing through a center of the coil pattern, and an outermost turn of the second region includes a plurality of corner portions having a quadrant arc shape and a linear first connecting portion connecting the plurality of corner portions, and a length of the first connecting portion is shorter than each length of the corner portions. Effect of the Invention

[0010] According to one aspect of the present invention, as the distance between the external electrode and the coil increases, the self-resonant frequency (SRF) of the coil component can be increased.

[0011] In accordance with another aspect of the present invention, the area of ​​the central core of the coil may be maintained or minimized while increasing the SRF to minimize degradation of the saturation current (Isat) characteristics of the coil component. [Brief description of the drawings]

[0012] [Figure 1] 1 is a perspective view showing a coil device according to a first embodiment of the present invention; [Diagram 2] 2 is a plan view and a partially enlarged view of FIG. 1. [Diagram 3] 1, the plan view of FIG. 1 is a diagram showing the interior angle between the extension line of the boundary between the corner portion and the first connecting portion and the extension line of the boundary between the corner portion and the second connecting portion, and the quadrant area. [Figure 4] 2 is a cross-sectional view taken along line II' of FIG. 1. [Diagram 5] 2 is a cross-sectional view taken along line II-II' of FIG. 1. [Figure 6] 10 is a plan view of a coil device according to a second embodiment of the present invention, and corresponds to FIG. 2; [Figure 7] 11 is a view showing a LT cross section of a coil device according to a third embodiment of the present invention, and corresponds to FIG. 4. [Figure 8] 11 is a view showing a WT cross section of a coil device according to a third embodiment of the present invention, and corresponds to FIG. 5 . [Figure 9] 4 is a graph showing SRF characteristics of the coil component according to the first embodiment of the present invention. [Figure 10] 3 is a plan view of a coil component according to a first comparative example that does not include a first connecting portion, and is a drawing corresponding to FIG. 2. [Figure 11] 1 is a graph showing SRF characteristics of a coil component according to a first comparative example of the present invention. [Figure 12] 11 is a plan view of a coil component according to a second comparative example that does not include a first connecting portion, and is a drawing corresponding to FIG. 10. [Figure 13] 13 is a graph showing SRF characteristics of a coil component according to a second comparative example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The terms used in this application are merely used to describe certain embodiments and are not intended to limit the present invention. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this application, the terms "include" or "have" specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and should be understood not to preclude the presence or additional possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. And, in the entire specification, "on" means to be located above or below the target part, and does not necessarily mean to be located on the upper side based on the direction of gravity.

[0014] In addition, the term "bonding" does not only refer to cases where the components are in direct physical contact with each other in the contact relationship between the components, but is used as a concept that also encompasses cases where other components are present between the components and the components are in contact with each other.

[0015] The size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and the present invention is not necessarily limited to those shown.

[0016] In the drawings, the L direction can be defined as the first direction or length direction, the W direction can be defined as the second direction or width direction, and the T direction can be defined as the third direction or thickness direction.

[0017] Hereinafter, coil parts according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same or corresponding components are given the same drawing numbers, and duplicate descriptions thereof will be omitted.

[0018] 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 removing noise, etc.

[0019] That is, in electronic devices, coil components can be used as power inductors, high frequency inductors, general beads, high frequency beads (GHz beads), common mode filters, and the like.

[0020] First Example FIG. 1 is a schematic perspective view of a coil device 1000 according to a first embodiment of the present invention, FIG. 2 is a plan view and a partially enlarged view of FIG. 1, FIG. 3 is a drawing showing the interior angle between the extension line of the boundary between the corner portion and the first connecting portion and the extension line of the boundary between the corner portion and the second connecting portion, and the quadrant area in the plan view of FIG. 1, FIG. 4 is a drawing showing a cross-section along line I-I' in FIG. 1, and FIG. 5 is a drawing showing a cross-section along line II-II' in FIG. 1.

[0021] Meanwhile, in order to more clearly show the connections between the components, the insulating layer on the body 100 that may be applied in this embodiment is omitted. Also, in Figs. 2 and 3, the external electrodes 400 and 500 are omitted.

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

[0023] The coil device 1000 according to this embodiment may include linear first coupling portions 311a, 312a in areas of the coil patterns 311, 312 that are arranged on the opposite side to the lead-out portions 331, 332.

[0024] The first connecting portions 311a, 312a connect a plurality of corner portions 311c, 312c having a quadrant arc shape to each other, are disposed in the second direction W, and can be spaced apart from the adjacent body surfaces 101, 102 by a constant distance d1.

[0025] In the coil component according to the present embodiment, the coil patterns 311, 312 include linear first connecting portions 311a, 312a, so that the separation distance d1 between the coil patterns 311, 312 and the external electrodes 400, 500 arranged on the main body 100 can be increased compared to when this portion is curved. As a result, the parasitic capacitance (Cp) between the coil patterns 311, 312 and the external electrodes 400, 500 can be reduced, and the Self-Resonant Frequency (SRF) can be increased.

[0026] In addition, since the coil component according to this embodiment includes linear first connecting portions 311a, 312a in the coil patterns 311, 312, the reduction in the area of ​​the core 110 located at the center of the coil patterns 311, 312 can be minimized compared to when this portion is curved, thereby preventing a deterioration in the saturation current (Isat) characteristics.

[0027] The main components constituting the coil device 1000 according to this embodiment will be described in detail below.

[0028] The main body 100 forms the exterior of the coil device 1000 according to this embodiment, and has a support member 200 and a coil 300 embedded therein.

[0029] The main body 100 may be formed in an overall hexahedral shape.

[0030] The main body 100 includes a first surface 101 and a second surface 102 that face each other in a length direction L (first direction), a third surface 103 and a fourth surface 104 that face each other in a width direction W (second direction), and a fifth surface 105 and a sixth surface 106 that face each other in a thickness direction T (third direction). Each of the first to fourth surfaces 101, 102, 103, and 104 of the main body 100 corresponds to a wall surface of the main body 100 that connects the fifth surface 105 and the sixth surface 106 of the main body 100.

[0031] The main body 100 may be exemplarily formed such that the coil device 1000 according to the present embodiment, on which the external electrodes 400 and 500 described below are formed, has 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 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 is not limited thereto. Meanwhile, the above-mentioned exemplary values ​​for the length, width, and thickness of the coil part 1000 are values ​​that do not reflect process errors, and therefore values ​​within the range that can be recognized as process errors should be considered to fall within the above-mentioned exemplary values.

[0032] The length of the coil part 1000 may refer to the maximum value of the dimensions of a plurality of line segments that are spaced apart from each other in the thickness direction T by connecting two outermost boundary lines facing each other in the length direction L of the coil part 1000 in parallel with 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 at the center of the width direction W of the coil part 1000. Alternatively, the length of the coil part 1000 may refer to the minimum value of the dimensions of the above-mentioned plurality of line segments. Alternatively, the length of the coil part 1000 may refer to the arithmetic average value of at least three or more of the dimensions of the above-mentioned plurality of line segments. Here, the plurality of line segments parallel to the length direction L may be equally spaced from each other in the thickness direction T, but the scope of the present invention is not limited thereto.

[0033] The thickness of the coil part 1000 may refer to the maximum value among the dimensions of a plurality of line segments spaced apart from each other in the length direction L by connecting two outermost boundary lines facing each other in the thickness direction T of the coil part 1000 shown in the image 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 at the center of the width direction W of the coil part 1000. Alternatively, the thickness of the coil part 1000 may refer to the minimum value among the dimensions of the above-mentioned plurality of line segments. Alternatively, the thickness of the coil part 1000 may refer to an arithmetic average value of at least three or more of the dimensions of the above-mentioned plurality of line segments. Here, the plurality of line segments parallel to the thickness direction T may be equally spaced from each other in the length direction L, but the scope of the present invention is not limited thereto.

[0034] The width of the coil part 1000 may refer to the maximum value among the dimensions of a plurality of line segments spaced apart from each other in the length direction L by connecting two outermost boundary lines facing each other in the width direction W of the coil part 1000 in parallel with 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 at the center of the thickness direction T of the coil part 1000. Alternatively, the width of the coil part 1000 may refer to the minimum value among the dimensions of the above-mentioned plurality of line segments. Alternatively, the width of the coil part 1000 may refer to an arithmetic average value of at least three or more of the dimensions of the above-mentioned plurality of line segments. Here, the plurality of line segments parallel to the width direction W may be equally spaced from each other in the length direction L, but the scope of the present invention is not limited thereto.

[0035] Alternatively, each of the length, width, and thickness of the coil device 1000 may be measured by a micrometer measurement method. The micrometer measurement method may be performed by setting a zero point with a micrometer that has been subjected to Gage R&R (Repeatability and Reproducibility), inserting the coil device 1000 according to the present embodiment between the tips of the micrometer, and rotating the measurement lever of the micrometer. Meanwhile, in measuring the length of the coil device 1000 by the micrometer measurement method, the length of the coil device 1000 may mean a value measured once, or may mean an arithmetic average of values ​​measured multiple times. This may be similarly applied to the width and thickness of the coil device 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 in which a magnetic material is dispersed in a resin. However, the main body 100 may have a structure other than the structure in which a magnetic material is dispersed in a resin. For example, the main body 100 may be made of a magnetic material such as ferrite, or may be made of a non-magnetic material.

[0037] The magnetic material may be ferrite or metallic magnetic powder.

[0038] The ferrite can 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 ferrites; and Li-based ferrites.

[0039] 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.

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

[0041] The ferrite and metal magnetic powders may each have an average diameter of about 0.1 μm to 30 μm, but are not limited thereto.

[0042] The body 100 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.

[0043] The resin may include, but is not limited to, epoxy, polyimide, liquid crystal polymer, and the like, either alone or in combination.

[0044] The body 100 has a core 110 that passes through the support member 200 and the coil 300. The core 110 may be formed by filling the through hole of the support member 200 with a magnetic composite sheet, but is not limited thereto.

[0045] The support member 200 may be disposed within the body 100. The support member 200 is configured to support the coil 300. Meanwhile, in some embodiments, the support member 200 may be omitted, for example, when the coil 300 corresponds to a wound coil or has a coreless structure.

[0046] The support member 200 may be formed of an insulating material including a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as a polyimide, or a photosensitive insulating resin, or may be formed of an insulating material obtained by impregnating such an insulating resin with a reinforcing material such as glass fiber or an inorganic filler. For example, the support member 200 may be formed of a material such as prepreg, ABF (Ajinomoto Build-up Film), FR-4, BT (Bismaleimide Triazine) resin, PID (Photo Imagable Dielectric), Copper Clad Laminate (CCL), etc., but is not limited thereto.

[0047] As the inorganic filler, at least one selected from the group consisting of silica (SiO2), alumina (Al2O3), silicon carbide (SiC), barium sulfate (BaSO4), talc, mud, mica powder, aluminum hydroxide (Al(OH)3), magnesium hydroxide (Mg(OH)2), calcium carbonate (CaCO3), magnesium carbonate (MgCO3), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO3), barium titanate (BaTiO3), and calcium zirconate (CaZrO3) can be used.

[0048] When the support member 200 is made of an insulating material including a reinforcing material, the support member 200 can provide better rigidity. When the support member 200 is made of an insulating material including no glass fiber, it is advantageous to reduce the overall thickness (meaning the sum of the dimensions of the coil 300 and the support member 200 along the thickness direction T in FIG. 1) of the support member 200 and the coil 300, thereby reducing the thickness of the components. When the support member 200 is made of an insulating material including a photosensitive insulating resin, the number of processes for forming the coil 300 is reduced, which is advantageous to reduce production costs, and fine vias 320 can be formed. The thickness of the support member 200 can be, for example, 10 μm to 50 μm, but is not limited thereto.

[0049] The coil 300 is disposed on the support member 200. The coil 300 is embedded in the body 100 to exhibit the characteristics of a coil component. For example, when the coil component 1000 of the present embodiment is used as a power inductor, the coil 300 can stabilize the power supply of an electronic device by storing an electric field in a magnetic field and maintaining an output voltage.

[0050] The coil 300 is formed on at least one of the opposing surfaces of the support member 200 and has at least one turn. In this embodiment, the coil 300 may include coil patterns 311 and 312, a via 320, and lead-out portions 331 and 332.

[0051] 1 to 5, the first coil pattern 311 and the second coil pattern 312 may be disposed on both sides of the support member 200 facing each other and may have a planar spiral shape with at least one turn around the core 110 of the main body 100. For example, based on the direction of FIG. 1, the first coil pattern 311 is disposed on the upper surface of the support member 200 and forms at least one turn around the core 110. The second coil pattern 312 is disposed on the lower surface of the support member 200 and forms at least one turn around the core 110. The first and second coil patterns 311 and 312 are formed such that the ends of the outermost turns connected to the lead-out portions 331 and 332 extend in the directions of the first surface 101 and the second surface 102 of the main body 100, respectively.

[0052] Referring to FIG. 2, on an LW cross section perpendicular to the winding axis of the coil patterns 311, 312, the coil patterns 311, 312 can be divided into a first region R1 in which the lead-out portions 331, 332 are arranged, and a second region R2 in which the lead-out portions 331, 332 are not arranged, based on a center line CL that is perpendicular to a first direction L and passes through the center of the coil patterns 311, 312.

[0053] Hereinafter, a description will be given based on the first coil pattern 311 and the second external electrode 500, and the second coil pattern 312 and the first external electrode 400 can be similarly described.

[0054] Referring to the first coil pattern 311 in FIG. 2, 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 311c having a quadrantal arc shape, and a linear first connecting portion 311a connecting the plurality of corner portions 311c.

[0055] 1 and 2, the first connecting portion 311a may be disposed in a second direction W and may be disposed parallel to the second surface 102 of the body 100 adjacent to the first connecting portion 311a.

[0056] Here, since the second surface 102 of the main body 100 corresponds to the surface on which the second external electrode 500 is arranged, the first coil pattern 311 includes a linear first connecting portion 311a, thereby ensuring a distance d1 with the second external electrode 500.

[0057] 1 to 3, the outermost turn of the portion of the first coil pattern 311 corresponding to the second region R2 is arranged in the first direction L and may further include a second connecting portion 311b aligned with the third surface 103 or the fourth surface 104 of the main body 100.

[0058] The first connecting portion 311a and / or the second connecting portion 312a may have a straight line shape with a curvature of zero.

[0059] In addition, the first connecting portion 311a and / or the second connecting portion 312a may include an inner surface facing the center of the first coil pattern 311 and an outer surface facing the inner surface, and the curvature of each of the inner surface and the outer surface may be zero.

[0060] Here, the curvature of 0 is not limited to a perfectly straight line, but means that the curvature is close to 0, taking into account process errors, positional deviations, and measurement errors that occur during the manufacturing process.

[0061] The second connection portion 311b may have a linear shape with a curvature of 0. Here, the curvature of 0 is not limited to a completely linear shape, but means that the curvature is close to 0, taking into account process errors, positional deviations, and measurement errors that occur during the manufacturing process.

[0062] Referring to FIG. 3, the angle θ between an imaginary line extending from the boundary between the first connecting portion 311a and the corner portion 311c and an imaginary line extending from the boundary between the second connecting portion 311b and the corner portion 311c may be greater than or equal to 80 degrees and less than or equal to 100 degrees.

[0063] Here, an imaginary line extending from the boundary between first connecting portion 311a and corner portion 311c and an imaginary line extending from the boundary between second connecting portion 311b and corner portion 311c ideally form a right angle, but an error of ±10 degrees may be allowed taking into account process errors, positional deviations, measurement errors, etc. that occur in the manufacturing process.

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

[0065] The corner portion 311c has a curved shape with a curvature greater than 0 and can form fewer turns than 1 / 4 turn.

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

[0067] Referring to FIG. 3, a cross section perpendicular to the winding axis of the first coil pattern 311 is divided into quadrants formed by a first axis CL1 passing through the center of the body 100 parallel to the first direction L and a second axis CL2 passing through the center of the body 100 parallel to the second direction W, and the corner portion 311c may be disposed in one of the quadrants.

[0068] Also, the first connecting portion 311a may be disposed so as to pass through the first axis CL1, and the second connecting portion 311b may be disposed so as to pass through the second axis CL2.

[0069] Meanwhile, for ease of explanation, in Figures 1 to 3, etc., imaginary boundary lines between the first connecting portion 311a, the corner portion 311c, and the second connecting portion 311b are shown and hatched differently, but the first connecting portion 311a, the corner portion 311c, and the second connecting portion 311b may correspond to each region of a single integrated first coil pattern 311.

[0070] In addition, the boundary between the first connecting portion 311a, the corner portion 311c, and the second connecting portion 311b may be defined as an imaginary line connecting points where the curvature changes on the inner surface and the outer surface, respectively.

[0071] Furthermore, the characteristics of the first connecting portion 311a, corner portion 311c, and second connecting portion 311b have been described based on the outermost turn of the first coil pattern 311, but this is not limited to this, and as shown in Figures 1 to 3, each of the multiple turns of the coil patterns 311 and 312 may include the first connecting portions 311a, 312a, corner portions 311c, 312c, and second connecting portions 311b, 312b.

[0072] Referring to FIG. 2, the length SW1 of the first connecting portion 311a may be shorter than the length C1 of each of the corner portions 311c.

[0073] By forming the straight-line first connecting portion 311a shorter than the curved corner portion 311c, when a current flows through the first coil pattern 311, concentration of magnetic flux around the corner portion 311c can be prevented, compared to a case in which the straight-line first connecting portion 311a is longer than the curved corner portion 311c.

[0074] Here, the length SW1 of the first connecting portion 311a may refer to, for example, the arithmetic mean value of at least three or more dimensions of a plurality of line segments spaced apart from each other, connecting both end boundaries of the first connecting portion 311a in the width direction W in the outermost turn of the first coil pattern 311 shown in an optical microscope image or a scanning electron microscope (SEM) image of a cross-section in the length direction L and width direction W taken at the center of the thickness direction T of the first coil pattern 311 of the coil device 1000. Here, the plurality of line segments may be equally spaced from each other, but the scope of the present invention is not limited thereto.

[0075] In addition, the length C1 of the corner portion 311c may be, for example, a dimension of a line connecting along the center of the line width between both end boundaries of the corner portion 311c in the outermost turn of the first coil pattern 311 shown in an optical microscope image or a SEM (Scanning Electron Microscope) image of a cross-section in the length direction L and width direction W taken at the center of the thickness direction T of the first coil pattern 311 of the coil device 1000, calculated using an Image J program tool, but is not limited thereto.

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

[0077] 5, the coil 300 may further include a via 320 connecting the first coil pattern 311 and the second coil pattern 312. Specifically, the via 320 may pass through the support member 200 to connect inner ends of the innermost turns of the first and second coil patterns 311 and 312 to each other. Thus, a 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. With this configuration, each component of the coil 300 may function as one coil connected between the first and second external electrodes 400 and 500 as a whole.

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

[0079] For example, when the first coil pattern 311, the via 320, and the first lead-out portion 331 are formed by plating on the upper surface of the support member 200 (based on the direction of FIG. 1), each of the first coil pattern 311, the via 320, and the first lead-out portion 331 may include a seed layer and an electrolytic plating layer. The seed layer may be formed by an electroless plating method or a vapor phase deposition method such as sputtering. Each of the seed layer and the electrolytic plating layer may have a single layer structure or a multilayer structure. The multilayer electrolytic plating layer may be formed in a conformal film structure in which one electrolytic plating layer is covered by the other electrolytic plating layer, or may be formed in a shape in which the other electrolytic plating layer is laminated only on one surface of one electrolytic plating layer. The seed layer of the first coil pattern 311, the seed layer of the via 320, and the seed layer of the first lead-out portion 331 may be formed integrally, and no boundary may be formed between them, but the present invention is not limited thereto. The electrolytic plating layer of the first coil pattern 311, the electrolytic plating layer of the via 320, and the electrolytic plating layer of the first extraction portion 331 may be integrally formed so that no boundaries are formed between them, but is not limited to this.

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

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

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

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

[0084] Each of the external electrodes 400, 500 may be formed of a plurality of layers. For example, the first external electrode 400 may include a first layer in contact with the first lead 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 insulating resin, or may be a copper (Cu) plating layer. The second layer may be a double-layer structure of a nickel (Ni) plating layer / tin (Sn) plating layer.

[0085] 4 and 5, the insulating film IF is disposed between the coil 300 and the body 100 so as to cover the coil 300. The insulating film IF may be formed along the surfaces of the support member 200 and the coil 300. The insulating film IF is for insulating the coil 300 from the body 100, and may include, but is not limited to, a known insulating material such as paralyzed. The insulating film IF may be formed by, but is not limited to, a method such as vapor deposition, and may also be formed by laminating insulating films on both sides of the support member 200.

[0086] Meanwhile, the coil device 1000 according to this embodiment may further include an insulating layer that covers the third to sixth surfaces 103, 104, 105, and 106 of the body 100, but is disposed in areas excluding the areas where the external electrodes 400 and 500 are disposed.

[0087] The insulating layer may be formed, for example, by applying and curing an insulating material containing an insulating resin onto the surface of the main body 100. In this case, the insulating layer may contain at least one of thermoplastic resins such as polystyrene-based, vinyl acetate-based, polyester-based, polyethylene-based, polypropylene-based, polyamide-based, rubber-based, and acrylic-based, thermosetting resins such as phenol-based, epoxy-based, urethane-based, melamine-based, and alkyd-based, and photosensitive insulating resins.

[0088] Second Example FIG. 6 is a plan view of a coil device 2000 according to a second embodiment of the present invention, and corresponds to FIG.

[0089] Comparing Figure 6 with Figure 2, the length SW2 of the first connecting portion 311a of the coil device 2000 in this embodiment, the length C2 of the corner portion 311c, and the separation distance d2 between the second surface 102 of the main body 100 and the first connecting portion 311a are different from those in the first embodiment.

[0090] Therefore, in describing this embodiment, only the length SW2 of the first connecting portion 311a, the length C2 of the corner portion 311c, and the separation distance d2 between the second surface 102 of the main body 100 and the first connecting portion 311a, which are different from the first embodiment of the present invention, will be described; however, the description of the first embodiment of the present invention can be applied as is to the remaining configurations of this embodiment.

[0091] 6, the length SW2 of the first connecting portion 311a of the coil device 2000 according to the present embodiment may be formed to be longer than the length SW1 of the first connecting portion 311a of the first example.

[0092] Furthermore, the length C2 of the corner portion 311c of the coil device 2000 according to this embodiment can be formed to be shorter than the length C1 of the corner portion 311c of the first example.

[0093] However, similarly to the first embodiment, the length SW2 of the first connecting portion 311a can be formed to be shorter than the length C2 of the corner portion 311c.

[0094] In the case of the coil device 2000 according to this embodiment, compared to the first embodiment, the distance d2 between the second surface 102 of the main body 100 on which the second external electrode 500 is arranged and the coil pattern 311 is increased, so that the effect of reducing the parasitic capacitance (Cp) and increasing the SRF (Self-Resonant Frequency) can be further increased.

[0095] At the same time, the length SW2 of the straight first connecting portion 311a increases, the length C2 of the corner portion 311c decreases, and the length SL1 of the second connecting portion 311b is maintained, thereby offsetting the reduction in the central core area due to the increase in the separation distance d2 between the second surface 102 of the main body 100 and the first coil pattern 311.

[0096] As a result, the coil device 2000 according to this embodiment can maintain the saturation current (Isat) characteristics while increasing the self-resonant frequency (SRF).

[0097] Third Example FIG. 7 is a schematic diagram showing an LT cross section of a coil device 3000 according to a third embodiment of the present invention, and corresponds to FIG. 4. FIG. 8 is a schematic diagram showing a WT cross section of a coil device 3000 according to a third embodiment of the present invention, and corresponds to FIG. 5.

[0098] 7 and 8 are compared with FIGS. 4 and 5, respectively, and the presence or absence of a support member 200 between the first coil pattern 311 and the second coil pattern 312 and the distance between the first coil pattern 311 and the second coil pattern 312 are different.

[0099] Therefore, in describing this embodiment, only the presence or absence of a support member 200 between the first coil pattern 311 and the second coil pattern 312, and the spacing between the first coil pattern 311 and the second coil pattern 312, which are different from the first embodiment of the present invention, will be described, and the description of the first embodiment of the present invention can be applied as is to the remaining configuration of this embodiment.

[0100] 7 and 8, the coil 300 may be integrally covered and supported by the insulating film IF. This embodiment corresponds to a coreless structure in which the support member 200 is omitted, and can be realized by disposing the coil 300 on the support member 200, completely removing the support member 200, and then forming the insulating film IF.

[0101] Referring to FIG. 8, the first coil pattern 311 and the second coil pattern 312 may be connected to each other by a via 320 penetrating the insulating film IF.

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

[0103] Since the insulating film IF can be formed thinner than the support member 200, the coil component 3000 of this embodiment can narrow the gap between the first coil pattern 311 and the second coil pattern 312 by the space previously occupied by the support member 200 compared to the first embodiment, thereby ensuring space for filling with magnetic material within the body 100 of limited size and increasing the effective volume.

[0104] As a result, the coil device 3000 according to this embodiment can improve inductance characteristics in accordance with an increase in effective volume.

[0105] Comparison of SRF improvement effects Fig. 9 is an SRF characteristic graph of the coil device 1000 according to the first embodiment of the present invention. Fig. 10 is a plan view of the coil device 10 according to the first comparative example not including the first connecting portion 311a, and corresponds to Fig. 2. Fig. 11 is an SRF characteristic graph of the coil device 10 according to the first comparative example of the present invention. Fig. 12 is a plan view of the coil device 20 according to the second comparative example not including the first connecting portion 311a, and corresponds to Fig. 10. Fig. 13 is an SRF characteristic graph of the coil device 20 according to the second comparative example of the present invention.

[0106] First, FIG. 9 is a graph showing the change in inductance depending on the change in frequency applied to the coil device 1000 according to the first embodiment, and the sample used in the experiment is a coil device 1000 having a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm.

[0107] In this sample, the separation distance d1 between the external electrode 500 and the first coil pattern 311 is 120 μm, the separation 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 0.3054 mm2 It is.

[0108] Referring to FIG. 9, in the coil device 1000 according to the first embodiment of the present invention, when the frequency was 157.530 MHz, the inductance was nearly 0 and the SRF was measured to be 157.530 MHz.

[0109] Referring to FIG. 10, the coil device 10 according to the first comparative example does not include a straight-line first connecting portion 311a when compared with the coil device 1000 according to the first embodiment of the present invention, and as a result, the distance d0 between the first coil pattern 311 and the second surface 102 of the main body 100 is narrower than that of the first embodiment.

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

[0111] With reference to FIG. 11, in the coil device 10 according to the first comparative example, when the frequency was 141.970 MHz, the inductance became 0 and the SRF was measured to be 141.970 MHz.

[0112] As a result of the above, in the case of the coil device 1000 according to the first embodiment of the present invention, it was confirmed that the parasitic capacitance is reduced and the SRF is increased by 10.96% as the distance d1 between the second surface 102 of the body 100 on which the second external electrode 500 is disposed is widened due to the linear first connecting portion 311a.

[0113] Next, referring to FIG. 12, the coil device 20 according to the second comparative example does not include a straight-line first connecting portion 311a when compared with the coil device 1000 according to the first embodiment of the present invention, but the distance d1 between the first coil pattern 311 and the second surface 102 of the main body 100 is formed to be the same as that of the first embodiment.

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

[0115] Here, considering the central core area, it can be seen that the coil device 20 according to the second comparative example also does not include the linear first connecting portion 311a, and therefore has a smaller central core area when the distance d1 between the first coil pattern 311 and the second surface 102 of the body 100 is the same as that of the coil device 1000 according to the first embodiment of the present invention. This may result in a decrease in saturation current (Isat) characteristics.

[0116] The coil device 1000 according to the first embodiment of the present invention has an Isat value of 4.0 A, whereas the coil device 20 according to the second comparative example has an Isat value of 3.7625 A, which can be assumed to be a side effect of the reduction in the central core area.

[0117] 13, in the coil device 20 according to the second comparative example, when the frequency was 155.070 MHz, the inductance became 0 and the SRF was measured to be 155.070 MHz.

[0118] As shown by the above results, in the case of the coil device 1000 according to the first embodiment of the present invention, when compared with the coil device 20 according to the second comparative example which does not have the linear first connecting portion 311a, the separation distance d1 between the first coil pattern 311 and the second surface 102 of the main body 100 is similar, and the SRF is increased by 1.59%.

[0119] In particular, in the coil device 1000 according to the first embodiment of the present invention, the area of ​​the central core is increased by the linear first connecting portion 311a, so that the saturation current (Isat) is increased by 6.31% compared to the coil device 20 according to the second comparative example.

[0120] In summary, in the case of the coil device 1000 according to the first embodiment of the present invention, it was confirmed that the SRF characteristics were improved while the saturation current (Isat) characteristics were not deteriorated compared to the first and second comparative examples.

[0121] Although one embodiment of the present invention has been described above, a person having ordinary knowledge in the relevant technical field may modify and change the present invention in various ways by adding, changing or deleting components, without departing from the concept of the present invention described in the claims, and this also falls within the scope of the claims of the present invention. [Explanation of symbols]

[0122] 100 Body 110 cores 200 Support member 300 coils 311 first coil pattern, 312 second coil pattern 311a, 312a 1st connection part 311b, 312b 2nd connection part 311c, 312c corner section 320 Beer 331 first drawer section, 332 second drawer section 400, 500 external electrode IF insulating film CL center line CL1 1st axis, CL2 2nd axis θ The internal angle between the extension line of the boundary between the corner portion and the first connecting portion and the extension line of the boundary between the corner portion and the second connecting portion R1 1st area, R2 2nd area d0, d1, d2 L-direction spacing C1, C2 Corner length SW1, SW2 Length of the first connecting part SL1, SL2 Length of the second connecting part 1000, 2000, 3000 Coil parts 10, 20 Comparative Example

Claims

1. a main body including a first surface and a second surface facing each other in a first direction, and a third surface and a fourth surface facing each other in a second direction perpendicular to the first direction; a coil disposed within the body, the coil including a coil pattern having at least one turn and an extractor extending from an outer end of the coil pattern to the first surface or the second surface; an external electrode disposed on the body and coupled to the coil; On a cross section perpendicular to a winding axis of the coil pattern, the coil pattern is divided into a first region in which the lead-out portion is arranged and a second region in which the lead-out portion is not arranged, with respect to a center line perpendicular to the first direction and passing through a center of the coil pattern; a coil component, wherein the outermost turn of the second region includes a plurality of corner portions having a quadrant arc shape and a linear first connecting portion connecting the plurality of corner portions, the length of the first connecting portion being shorter than each of the lengths of the plurality of corner portions.

2. The coil component according to claim 1 , wherein the first connecting portion is disposed in the second direction and aligned with a main body surface adjacent to the first connecting portion.

3. The coil component according to claim 1 , wherein the outermost turn of the second region further includes a second connecting portion disposed in the first direction and aligned with a third surface or a fourth surface of the body.

4. 4. The coil component according to claim 3, wherein an angle formed by an imaginary line extending a boundary between the first connecting portion and the corner portion and an imaginary line extending a boundary between the second connecting portion and the corner portion is greater than or equal to 80 degrees and less than or equal to 100 degrees.

5. The coil component according to claim 3 , wherein the corner portion connects between the first connecting portion and the second connecting portion.

6. The cross section perpendicular to the winding axis of the coil pattern is a first axis passing through a center of the body parallel to the first direction and a second axis passing through a center of the body parallel to the second direction; The coil component according to claim 3 , wherein the corner portion is disposed in one of the quadrants.

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

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

9. The coil component according to claim 1 , wherein the first connecting portion has a curvature of zero.

10. The coil component according to claim 1 , wherein the corner portion has a curvature greater than zero.

11. The coil component according to claim 3 , wherein the second connecting portion has a curvature of zero.

12. The coil component according to claim 1 , wherein the corner portion forms fewer than a quarter turn.

13. the first connection portion includes an inner surface facing a center of the coil pattern and an outer surface facing the inner surface, The coil component according to claim 1 , wherein each of the inner surface and the outer surface has a curvature of zero.

14. the corner portion includes an inner surface facing a center of the coil pattern and an outer surface facing the inner surface, The coil component according to claim 1 , wherein at least one of the inner surface and the outer surface has a curvature greater than zero.

15. the second connection portion includes an inner surface facing a center of the coil pattern and an outer surface facing the inner surface, The coil component according to claim 3 , wherein each of the inner side surface and the outer side surface has a curvature of zero.

16. The coil component according to claim 1 , wherein the coil pattern has a plurality of turns, and each turn includes the first connecting portion.

17. a support member disposed within the body; The coil component according to claim 1 , wherein the coil is disposed on the support member.

18. The support member includes one surface and another surface facing each other, The coil is 18. The coil component according to claim 17, comprising: a first coil pattern arranged on one surface of the support member, a first lead-out portion extending from the first coil pattern to the first surface, a second coil pattern arranged on the other surface of the support member, a second lead-out portion extending from the second coil pattern to the second surface, and a via connecting inner ends of the first coil pattern and the second coil pattern.

19. The coil component according to claim 18 , wherein each of the first coil pattern and the second coil pattern includes the corner portion and the first connecting portion.

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