Coil component

Abstract

The invention provides a coil assembly. The coil component may include: a body including a first surface and a second surface opposite to each other in a first direction, and a third surface connecting the first surface and the second surface; the supporting component is arranged in the main body; a coil disposed on the support member 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 electrode part extending from the lead-out part to the outside of the main body, provided on the main body, and having an average thickness smaller than an average thickness of the lead-out part.

Description

[0001] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0109908 filed on August 22, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

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

[0003] An inductor (coil component) is a representative passive electronic component used in electronic devices together with a resistor and a capacitor.

[0004] As electronic devices continue to achieve higher performance and smaller size, electronic components used in the electronic devices are also increasing in number and becoming smaller.

[0005] In addition, in the case of obtaining a thin film coil assembly by forming a coil on a supporting member by plating, it can be advantageous for miniaturization, but there may be a problem that the bonding force between the external electrode and the coil may be reduced, so that a structure is required that can maintain the connection reliability between the coil and the external electrode despite vibration or impact. Summary of the invention

[0006] An aspect of the present disclosure provides a coil component which can maintain connection reliability between a coil of the coil component and an external electrode despite vibration or external impact.

[0007] Another aspect of the present disclosure is to enhance a physical coupling force between an electrode part and a body through a structure in which the electrode part is bent to surround the body.

[0008] According to one aspect of the present disclosure, a coil component may include: a main body, including a first surface and a second surface opposite to each other in a first direction, and a third surface connecting the first surface and the second surface; a support member, disposed in the main body; a coil, disposed on the support member 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 electrode portion, extending from the lead-out portion to the outside of the main body and disposed on the main body, and having an average thickness less than an average thickness of the lead-out portion.

[0009] According to another aspect of the present disclosure, a coil assembly may include: a main body; a first coil and a second coil, which are arranged in the main body and have at least one turn; a first electrode portion and a second electrode portion, which extend from both ends of the first coil to the outside of the main body, respectively, and are arranged on the main body; and a third electrode portion and a fourth electrode portion, which extend from both ends of the second coil to the outside of the main body, respectively, and are arranged on the main body, wherein the average thickness of each of the first electrode portion and the second electrode portion is less than the average thickness of the first coil, and the average thickness of each of the third electrode portion and the fourth electrode portion is less than the average thickness of the second coil.

[0010] According to another aspect of the present disclosure, a coil assembly may include: a main body; a support member disposed within the main body; a coil disposed on the support member within the main body and having at least one turn; and an electrode portion extending from a lead-out portion of the coil to the outside of the main body and disposed on an outer surface of the main body to serve as an external electrode, wherein the electrode portion includes a reduced thickness portion at one end of the coil, and the electrode portion is integrally formed with the lead-out 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 schematically showing a coil component according to a first embodiment of the present disclosure; Figure 2 is along Figure 1 A cross-sectional view taken along line II'; Figure 3 is along Figure 1 A cross-sectional view taken along line II-II'; Figure 4A yes Figure 1 right side view, and Figure 4B , Figure 4C and Figure 4D yes Figure 4A Variation examples of ; Figure 5 is a first modified example of the coil component according to the first embodiment of the present disclosure. Figure 2 The corresponding diagram; Figure 6 is a second modified example of the coil component according to the first embodiment of the present disclosure, and is Figure 5 The corresponding diagram; Figure 7 is a perspective view schematically showing a coil component according to a second embodiment of the present disclosure; Fig. 8A yes Figure 7 A bottom view of Figure 8B , Figure 8C , Fig.8D and Fig. 8E yes Fig. 8A Variation examples of ; Fig. 9 is a perspective view schematically showing a coil component according to a third embodiment of the present disclosure; Fig.10 It is shown Fig. 9 An exploded stereogram of the connection relationship between the coils; Fig.11 yes Fig. 9 Left side view; Fig.12 yes Fig. 9 Right side view; Fig.13 is a process diagram schematically illustrating an operation for forming a coil of the coil component according to the first embodiment of the present disclosure; Fig.14 is a process diagram schematically illustrating an operation for forming a body of the coil component according to the first embodiment of the present disclosure; and Fig.15 1 is a process diagram schematically illustrating a bending operation of an electrode portion of a coil component according to a first embodiment of the present disclosure. DETAILED DESCRIPTION

[0012] The terms used in this application are only used to describe specific embodiments and are not intended to limit the present disclosure. Unless the context clearly stipulates otherwise, singular expressions include plural expressions. In this application, terms such as "including" or "having" are intended to specify the features, quantities, operations, components, parts and / or combinations thereof described in the specification, and should be understood as not excluding the feasibility of adding or having one or more other features, quantities, operations, components, parts and / or combinations thereof. Throughout the specification, "on" refers to being located above or below an object component, and does not necessarily refer to being located on the upper side relative to the direction of gravity.

[0013] In addition, in the contact relationship between respective components, the term “coupled” refers not only to the case where the respective components are in direct physical contact, but is used for a concept including even the case where other components are interposed between the respective components and the components are in contact with other components, respectively.

[0014] The size and thickness of each component shown in the drawings are arbitrarily illustrated for convenience of description, and thus the present disclosure is not necessarily limited to the drawings.

[0015] In the drawings, the L direction may be defined as a first direction or a length direction, the W direction may be defined as a second direction or a width direction, and the T direction may be defined as a third direction or a thickness direction.

[0016] Hereinafter, a coil component according to an embodiment will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same reference numerals are attached to the same or corresponding components, and a repeated description thereof will be omitted.

[0017] Various electronic components are used in electronic devices, and among these electronic components, various types of coil components are appropriately used for noise removal and the like.

[0018] For example, in electronic devices, coil components can be used as power inductors, high-frequency inductors, ordinary magnetic beads, high-frequency (GHz) magnetic beads, common mode filters, etc.

[0019] First embodiment Figure 1 is a perspective view schematically showing a coil component according to a first embodiment of the present disclosure. Figure 2 is along Figure 1 A cross-sectional view taken along line II'. Figure 3 is along Figure 1 A cross-sectional view taken along line II-II'. Figure 4A yes Figure 1 right side view, and FIG. 4B to FIG. 4D yes Figure 4A A variation example of .

[0020] In addition, in order to more clearly illustrate the coupling between components, an insulating layer that may be applied to the body of the present disclosure is omitted.

[0021] Reference Figure 1 4 , the coil component 1000 according to the first embodiment of the present disclosure may include a body 100 , a support member 210 , a coil 300 , and first and second electrode parts 510 and 520 .

[0022] The coil component 1000 according to the present embodiment may include a first electrode portion 510 and a second electrode portion 520 which are integrally formed with the coil and extend from the coil 300 to the outside of the body 100 and are bent along the side surface and the lower surface of the body 100. The coil component 1000 according to the present embodiment may not include a separate external electrode.

[0023] Therefore, compared with a structure in which a separate external electrode is connected to the coil 300, the bonding force between the coil 300 and the external electrode can be improved, and due to the structure in which the first electrode portion 510 and the second electrode portion 520 are bent to surround the main body 100, the physical bonding force between the first electrode portion 510 and the main body 100 and between the second electrode portion 520 and the main body 100 can also be enhanced.

[0024] Therefore, the coil component 1000 according to the present embodiment may have an effect of maintaining connection reliability between the coil 300 and the first electrode portion 510 and between the coil 300 and the second electrode portion 520 even in the case of external shock or vibration.

[0025] Hereinafter, main components constituting the coil component 1000 according to the present embodiment will be described in detail.

[0026] The body 100 forms an appearance of the coil component 1000 according to the present embodiment, and the support member 210 and the coil 300 are embedded in the body 100 .

[0027] The body 100 may be formed to have an overall hexahedral shape.

[0028] The main body 100 has a first surface 101 and a second surface 102 opposite to each other in the length direction L (first direction), a third surface 103 and a fourth surface 104 opposite to each other in the thickness direction T (third direction), and a fifth surface 105 and a sixth surface 106 opposite to each other in the width direction W (second direction). Each of the first surface 101, the second surface 102, the fifth surface 105, and the sixth surface 106 of the main body 100 corresponds to a wall surface of the main body 100 connecting the third surface 103 and the fourth surface 104 of the main body 100.

[0029] In the body 100, as an example, the coil component 1000 including the first electrode portion 510 and the second electrode portion 520 according to the present embodiment can be formed to 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 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 present disclosure is not limited thereto. On the other hand, the above exemplary values ​​of the length, width, and thickness of the coil component 1000 refer to values ​​that do not reflect process errors, and values ​​within a range that can be identified as process errors should be considered to correspond to the above exemplary values.

[0030] Based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-thickness direction T cross section taken from the central portion of the coil component 1000 in the width direction W, the length of the coil component 1000 may refer to the maximum value of the sizes of a plurality of corresponding line segments obtained by connecting two outermost boundary lines of the coil component 1000 shown in the image in the length direction L to each other so as to be parallel to the length direction L and spaced apart from each other in the thickness direction T. Alternatively, the length of the coil component 1000 may refer to the minimum value of the sizes of the plurality of corresponding line segments. Alternatively, the length of the coil component 1000 may refer to the arithmetic mean of at least 3 of the sizes of the plurality of corresponding line segments. In this case, the plurality of line segments parallel to the length direction L may be spaced apart from each other equidistantly in the thickness direction T, but the scope of the present disclosure is not limited thereto.

[0031] Based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-thickness direction T cross section taken from the central portion of the coil component 1000 in the width direction W, the thickness of the coil component 1000 may refer to the maximum value of the sizes of a plurality of corresponding line segments obtained by connecting two outermost boundary lines of the coil component 1000 shown in the image in the thickness direction T to each other in parallel with the thickness direction T and spaced apart from each other in the length direction L. Alternatively, the thickness of the coil component 1000 may refer to the minimum value of the sizes of the plurality of corresponding line segments. Alternatively, the thickness of the coil component 1000 may refer to the arithmetic mean of at least 3 of the sizes of the plurality of corresponding line segments. In this case, the plurality of line segments parallel to the thickness direction T may be equally spaced apart from each other in the length direction L, but the scope of the present disclosure is not limited thereto.

[0032] Based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-width direction W cross section taken from the central portion of the coil component 1000 in the thickness direction T, the width of the coil component 1000 may refer to the maximum value of the sizes of a plurality of corresponding line segments obtained by connecting two outermost boundary lines of the coil component 1000 shown in the image in the width direction W to each other in parallel with the width direction W and spaced apart from each other in the length direction L. Alternatively, the width of the coil component 1000 may refer to the minimum value of the sizes of the plurality of corresponding line segments. Alternatively, the width of the coil component 1000 may refer to the arithmetic mean of at least 3 of the sizes of the plurality of corresponding line segments. In this case, the plurality of line segments parallel to the width direction W may be spaced apart from each other equidistantly in the length direction L, but the scope of the present disclosure is not limited thereto.

[0033] Optionally, the length, width and thickness of the coil component 1000 can be measured by a micrometer measurement method. The micrometer measurement method can be performed by the following method: setting the zero point with a micrometer measuring repeatability and reproducibility (R&R), inserting the coil component 1000 according to the present embodiment between the tips of the micrometer and rotating the measuring rod of the micrometer. On the other hand, when measuring the length of the coil component 1000 by the micrometer measurement method, the length of the coil component 1000 can refer to a value measured once, and can also refer to the arithmetic mean of the values ​​measured multiple times. This can be applied to the width and thickness of the coil component 1000 in the same manner.

[0034] 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 a structure in which a magnetic material is dispersed in a resin. For example, the main body 100 may be formed of a magnetic material such as ferrite.

[0035] The magnetic material can be ferrite or magnetic metal powder.

[0036] The ferrite may be, for example, at least one of spinel ferrite (such as Mg-Zn-based ferrite, Mn-Zn-based ferrite, Mn-Mg-based ferrite, Cu-Zn-based ferrite, Mg-Mn-Sr-based ferrite, Ni-Zn-based ferrite, etc.), hexagonal ferrite (such as Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite and Ba-Ni-Co-based ferrite, etc.), garnet-type ferrite (such as Y-based ferrite, etc.), and Li-based ferrite.

[0037] The magnetic metal 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), boron (B), zirconium (Zr), hafnium (Hf), phosphorus (P) and nickel (Ni). For example, the magnetic metal powder may be at least one of pure iron powder, Fe-Si alloy powder, Fe-Si-Al alloy powder, Fe-Ni alloy powder, Fe-Ni-Mo alloy powder, Fe-Ni-Mo-Cu alloy powder, Fe-Co alloy powder, Fe-Ni-Co alloy powder, Fe-Cr alloy powder, Fe-Cr-Si alloy powder, Fe-Si-Cu-Nb alloy powder, Fe-Ni-Cr alloy powder and Fe-Cr-Al alloy powder.

[0038] The magnetic metal powder may include amorphous and / or crystalline. For example, the magnetic metal powder may be a Fe-Si-B-Cr based amorphous alloy powder, but is not limited thereto.

[0039] Each of the ferrite and the magnetic metal powder may have an average diameter of about 0.1 μm to 30 μm, but the present disclosure is not limited thereto.

[0040] The body 100 may include two or more types of magnetic materials dispersed in the resin. In this case, different types of magnetic materials refer to that the magnetic materials dispersed in the resin are distinguished from each other by any one of average diameter, composition, crystallinity, and shape.

[0041] The resin may include, but is not limited to, epoxy resin, polyimide, liquid crystal polymer, etc., alone or in combination.

[0042] The body 100 has a core 110 penetrating the support member 200 and the coil 300. The core 110 may be formed by filling a through hole of the support member 210 with a magnetic composite sheet, but the present disclosure is not limited thereto.

[0043] The support member 210 may be disposed within the body 100. The support member 210 is a component for supporting the coil 300. In addition, according to an embodiment such as when the coil 300 corresponds to a wound coil or has a coreless structure, the support member 210 may not be included.

[0044] The support member 210 may be formed of an insulating material including a thermosetting insulating resin such as epoxy resin, a thermoplastic insulating resin such as polyimide, a photosensitive insulating resin, or may be formed of an insulating material in which a reinforcing material such as glass fiber or an inorganic filler is impregnated in the insulating resin. For example, the support member 210 may include a prepreg, an Ajinomoto Build-up Film (ABF), FR-4, a bismaleimide triazine (BT) resin, a photosensitive dielectric (PID), etc., but the present disclosure is not limited thereto.

[0045] As the inorganic filler, at least one selected from the group consisting of silicon dioxide (SiO2), aluminum oxide (Al2O3), silicon carbide (SiC), barium sulfate (BaSO4), talc, 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.

[0046] When the support member 210 is formed of an insulating material including a reinforcing material, the support member 210 can provide more excellent rigidity. When the support member 210 is formed of an insulating material not including glass fiber, it is advantageous to reduce the total thickness of the support member 210 and the coil 300 (referring to the thickness of the coil 300 and the support member 210). Figure 1The thickness of the component is reduced by 20 (the sum of the dimensions in the thickness direction T in FIG. 1 ). When the support member 210 is formed of an insulating material including a photosensitive insulating resin, since the number of processes for forming the coil 300 is reduced, it is possible to reduce production costs and form a fine via hole 320. The thickness of the support member 210 may be, for example, greater than or equal to 10 μm and less than or equal to 50 μm, but is not limited thereto.

[0047] The coil 300 is disposed on the support member 210. The coil 300 is embedded in the body 100 and exhibits the characteristics of a coil component. For example, when the coil component 1000 according to the present embodiment is used as a power inductor, the coil 300 can store an electric field as a magnetic field to maintain an output voltage, thereby stabilizing the power of the electronic device.

[0048] The coil 300 is formed on at least one of two surfaces of the support member 210 facing each other and forms at least one turn. In this embodiment, the coil 300 may include coil patterns 311 and 312 , a via 320 , and first and second lead-out portions 331 and 332 .

[0049] In addition, first and second electrode parts 510 and 520 to be described later may integrally extend from first and second lead-out parts 331 and 332 and extend to the outside of body 100 with a thickness less than that of first and second lead-out parts 331 and 332 .

[0050] Reference Figures 1 to 3 , each of the coil patterns may be disposed on two surfaces of the support member 210 that are opposite to each other, and may have a planar spiral shape that forms at least one turn with the core 110 of the body 100 as the center. Figure 1 The first coil pattern 311 may be disposed on the upper surface of the support member 210 to form at least one turn centered on the core 110. The second coil pattern 312 is disposed on the lower surface of the support member 210 and forms at least one turn centered on the core 110. The first coil pattern 311 may be formed in a form such that the end of the outermost turn connected to the first lead-out portion 331 extends in a direction toward the first surface 101 of the body 100, and the second coil pattern 312 may be formed in a form such that the end of the outermost turn connected to the second lead-out portion 332 extends in a direction toward the second surface 102 of the body 100.

[0051] Reference Figures 1 to 3 The first lead-out portion 331 and the second lead-out portion 332 may extend from the coil patterns 311 and 312 to the first surface 101 or the second surface 102 of the body 100 .

[0052] Specifically, the first lead-out portion 331 may be connected to the first electrode portion 510, extending from the outer end of the first coil pattern 311 to the first surface 101 of the body 100, and the first electrode portion 510 extends to the outside of the body 100 to be bent. However, the first lead-out portion 331 and the first electrode portion 510 may have a structure in which they are integrally formed and connected to each other only with different thicknesses.

[0053] Similarly, the second lead-out portion 332 may be connected to the second electrode portion 520, extending from the outer end of the second coil pattern 312 to the second surface 102 of the body 100, and the second electrode portion 520 extends to the outside of the body 100 to be bent. However, the second lead-out portion 332 and the second electrode portion 520 may have a structure in which they are integrally formed and connected to each other only with different thicknesses.

[0054] Reference Figure 3 , 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 penetrate the support member 210 and connect the inner ends of the innermost turns of each of the first coil pattern 311 and the second coil pattern 312 to each other. Therefore, the signal input to the first electrode portion 510 may be output to the second electrode portion 520 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 various components of the coil 300 may function as a coil connected between the first electrode portion 510 and the second electrode portion 520 as a whole.

[0055] At least one of the coil patterns 311 and 312 , the via 320 , and the first and second lead-out portions 331 and 332 may include at least one conductive layer.

[0056] For example, when the first coil pattern 311, the via hole 320, and the first lead-out portion 331 are formed on the upper surface of the support member 210 by plating (based on Figure 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 electroplating layer. The seed layer may be formed by electroless plating or a vapor deposition method such as sputtering. Each of the seed layer and the electroplating layer may have a single-layer structure or a multi-layer structure. The electroplating layer with a multi-layer structure may be formed as a conformal film structure in which one electroplating layer is covered by another electroplating layer, and may also be formed as a shape in which another electroplating layer is laminated only on 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 so that no boundary is formed between them, but the present disclosure 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 so that no boundary is formed between them, but the present disclosure is not limited thereto.

[0057] Each of the coil patterns 311 and 312, the via 320, and the first and second lead-out portions 331 and 332 may include a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo), or alloys thereof, but the present disclosure is not limited thereto.

[0058] In addition, the first electrode portion 510 and the second electrode portion 520 , which are respectively integrated with the first lead portion 331 and the second lead portion 332 , may also include the above-mentioned conductive material.

[0059] Reference Figure 1 and Figure 2 The first electrode portion 510 and the second electrode portion 520 may extend from the first lead portion 331 and the second lead portion 332 to the outside of the body 100 and be disposed on the body 100, and may be formed to have an average thickness less than that of the first lead portion 331 and the second lead portion 332, respectively.

[0060] Since the first and second lead portions 331 and 332 have substantially the same thickness as the coil patterns 311 and 312 , an operating region with discontinuously varying thickness may be formed between the first and second lead portions 331 and 332 and the first and second electrode portions 510 and 520 .

[0061] In addition, the average thickness of the first and second electrode parts 510 and 520 may be formed to be smaller than the average thickness of the support member 210. For example, the average thickness of the support member 210 may be 68 μm, and the average thickness of the first and second electrode parts 510 and 520 may be 30 μm or less, but the present disclosure is not limited thereto.

[0062] In this case, based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-thickness direction T cross section taken from a central portion of the coil component 1000 in the width direction W, the average thickness of the first lead-out portion 331 and the second lead-out portion 332 or the average thickness of the support member 210 may refer to the arithmetic mean of at least three of the sizes of a plurality of corresponding line segments obtained by connecting two outermost boundary lines of each of the first lead-out portion 331 and the second lead-out portion 332 or the support member 210 opposite in the thickness direction T shown in the image to each other so as to be parallel to the thickness direction T and spaced apart from each other in the length direction L. In this case, the plurality of line segments may be spaced apart from each other at equal distances, but the scope of the present disclosure is not limited thereto.

[0063] In addition, based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-thickness direction T cross section taken from a central portion of the coil component 1000 in the width direction W, the average thickness of the first electrode portion 510 and the second electrode portion 520 may refer to an arithmetic mean of at least three of the sizes of a plurality of corresponding line segments obtained by connecting two outermost boundary lines opposite to each other in the length direction L shown in the image of each of the first electrode portion 510 and the second electrode portion 520 to be parallel to the length direction L and spaced apart from each other in the thickness direction T. In this case, the plurality of line segments may be spaced apart from each other at equal distances, but the scope of the present disclosure is not limited thereto.

[0064] Reference Figure 2 , the first electrode portion 510 and the second electrode portion 520 may be formed integrally with the first lead portion 331 and the second lead portion 332, respectively, so that no boundary may appear between the first electrode portion 510 and the first lead portion 331 and between the second electrode portion 520 and the second lead portion 332. That is, the first electrode portion 510 may be formed integrally with the first lead portion 331 without an interface, and the second electrode portion 520 may be formed integrally with the second lead portion 332 without an interface.

[0065] Reference Figure 2 The first electrode portion 510 and the second electrode portion 520 may be directly connected to the first lead portion 331 and the second lead portion 332, respectively, and may include extension portions 511 and 521 disposed on the first surface 101 or the second surface 102 of the body 100 and pad portions 512 and 522 disposed on the third surface 103 of the body 100.

[0066] The extension portions 511 and 521 and the pad portions 512 and 522 may be integrally formed with each other and may be connected without an interface.

[0067] Reference Figure 1 and Figure 2 The extensions 511 and 521 may include a bent portion BP bent toward the third surface 103 of the body 100 in a region contacting the lead-out portions 331 and 332 , and an outer surface of the bent portion BP may include a curved surface. The extensions 511 and 521 may further extend onto the third surface 103 .

[0068] The bent portion BP of the present embodiment corresponds to a feature obtained by integrally forming the first and second electrode portions 510 and 520 from the first and second lead portions 331 and 332, respectively, and bending downward to closely contact the surface of the body 100. Therefore, the outer surface of the bent portion BP may be formed in a rounded shape.

[0069] Reference Figure 2, the first extension portion 511 may extend outward from the first lead-out portion 331 and be disposed on the first surface 101 of the body 100 .

[0070] Similarly, the second extension portion 521 may extend outward from the second lead-out portion 332 and be disposed on the second surface 102 of the body 100 .

[0071] Reference Figure 2 , an average length H1 of the first extension portion 511 may be different from an average length H2 of the second extension portion 521 , and the average length H1 of the first extension portion 511 may be longer than the average length H2 of the second extension portion 521 .

[0072] The above features may be caused by the difference in extension distance when the extension portions 511 and 521 extending from the respective first and second lead-out portions 331 and 332 are bent downward and disposed on the body 100 , and the difference in extension distance may be equal to the sum of the thickness of the support member 210 and the thickness of the bent portion BP.

[0073] In this case, based on an optical microscope image or a scanning electron microscope (SEM) image of a length direction L-thickness direction T cross section taken from a central portion of the coil component 1000 in the width direction W, the average length of the extension 511 or 521 may refer to an arithmetic mean of at least three of the sizes of a plurality of line segments obtained by connecting the uppermost boundary line and the lowermost boundary line of the extension 511 or 521 shown in the image, which are opposite in the thickness direction T, to each other so as to be parallel to the thickness direction T and spaced apart from each other in the length direction L. In this case, the plurality of line segments may be spaced apart from each other at equal distances, but the scope of the present disclosure is not limited thereto.

[0074] Figure 4A yes Figure 1 Right side view, FIG. 4B to FIG. 4D yes Figure 4A A variation example of .

[0075] Reference Figure 4A , the extending portions 511 and 521 of the present embodiment may have a constant width in the second direction W. For example, the extending portions 511 and 521 may have a rectangular shape based on a WT cross section.

[0076] However, the scope of the present disclosure is not limited thereto, and the shapes of the extensions 511 and 521 may be variously modified as follows.

[0077] Reference Figure 4B , the widths of the extension portions 511 and 521 in the second direction W may be greatest in regions contacting the pad portions 512 and 522. For example, the extension portions 511 and 521 may have a trapezoidal shape based on a WT cross section.

[0078] Optionally, refer to Figure 4C , the widths of the extension portions 511 and 521 in the second direction W may be smallest in regions contacting the pad portions 512 and 522. For example, the extension portions 511 and 521 may have an inverted trapezoidal shape based on a WT cross section.

[0079] Optionally, refer to Figure 4D , the widths of the extensions 511 and 521 in the second direction W may be greatest in the central regions of the extensions 511 and 521. For example, the extensions 511 and 521 may have a hexagonal shape based on a WT cross section.

[0080] Reference Figure 1 , the widths of the pad parts 512 and 522 in the second direction W may be greatest in a region closest to the center of the third surface 103 of the body 100 .

[0081] In addition, the widths of the pad parts 512 and 522 in the second direction W may gradually increase toward the center of the third surface 103 of the body 100 .

[0082] In addition, the widths of the pad parts 512 and 522 in the second direction W may be formed to be minimum in regions contacting the extension parts 511 and 521 .

[0083] Since the respective areas of the first electrode portion 510 and the second electrode portion 520 have the above-mentioned shapes, the physical bonding force between the main body 100 and the first electrode portion 510 and between the main body 100 and the second electrode portion 520 can be enhanced, and the width of the extension portions 511 and 521 can be narrow, so that when the coil component 1000 according to the present embodiment is mounted on a printed circuit board (PCB), the risk of short circuit with adjacent components can be reduced.

[0084] In addition, refer to Figure 2 The first electrode portion 510 and the second electrode portion 520 may further include a first metal layer 11 disposed on the pad portions 512 and 522. For example, the first metal layer 11 may be a nickel (Ni) plated layer.

[0085] In addition, the first electrode portion 510 and the second electrode portion 520 may further include a second metal layer 22 disposed on the first metal layer 11. For example, the second metal layer 22 may be a tin (Sn) plated layer.

[0086] The first metal layer 11 and the second metal layer 22 may be formed by electroplating, but the present disclosure is not limited thereto.

[0087] Reference Figure 2 and Figure 3, the insulating film IF is provided between the coil 300 and the body 100 to cover the coil 300. The insulating film IF may be formed along the surfaces of the support member 210 and the coil 300. The insulating film IF is used to insulate the coil 300 from the body 100, and may include a known insulating material such as polyparaxylene, but the present disclosure is not limited thereto. The insulating film IF may be formed by a method such as vapor deposition, but the present disclosure is not limited thereto, and may be formed by laminating an insulating film on the surfaces of the support member 210 and the coil 300.

[0088] <Modification Example of First Embodiment> Figure 5 is a first modified example of the coil component according to the first embodiment of the present disclosure corresponding to Figure 2 .

[0089] Will Figure 5 and Figure 2 For comparison, Figure 5 and Figure 2 The difference is that an adhesive layer AL disposed between the body 100 and the pad parts 512 and 522 is further included.

[0090] Therefore, when describing this modified example, only the adhesive layer AL that is different from the first embodiment of the present disclosure will be described, and the description in the first embodiment of the present disclosure can be applied to the remaining components of this modified example as it is.

[0091] Reference Figure 5 The coil component 1000 ′ according to the present embodiment may further include an adhesive layer AL disposed between the pad parts 512 and 522 and the third surface 103 of the body 100 .

[0092] The adhesive layer AL is a component that may enhance the bonding force between the pad parts 512 and 522 and the body 100 , and may include epoxy resin.

[0093] The adhesive layer AL may be a conductive epoxy layer containing metal particles, but the present disclosure is not limited thereto and may be a non-conductive epoxy layer.

[0094] Reference Figure 5 , the adhesive layer AL of the present embodiment is formed of a single layer, but the present disclosure is not limited thereto and may be formed of a plurality of layers.

[0095] The adhesive layer AL may be formed in the form of a sheet or paste including epoxy resin, but the present disclosure is not limited thereto.

[0096] The coil component 1000 ′ according to the present embodiment may further include an adhesive layer AL disposed between the pad parts 512 and 522 and the third surface 103 of the body 100 , so that mechanical properties capable of withstanding shock or vibration may be improved.

[0097] Figure 6 is a second modified example of the coil component according to the first embodiment of the present disclosure.

[0098] Will Figure 6 and Figure 5 For comparison, Figure 6 and Figure 5 The difference is that the insulating layer 700 is further provided between the third surface 103 of the body 100 and the adhesive layer AL.

[0099] Therefore, when describing the present modified example, only the insulating layer 700 which is different from the first modified example of the present disclosure will be described, and for the remaining components, the description in the first embodiment of the present disclosure can be applied as it is.

[0100] Reference Figure 6 , the insulating layer 700 may be disposed on the third surface 103 of the body 100 , and at least a portion of the insulating layer 700 may be disposed to extend between the third surface 103 of the body 100 and the adhesive layer AL.

[0101] That is to say, Figure 6 , the insulating layer 700 is shown to cover the entire third surface 103 of the body 100, but the present disclosure is not limited thereto, and a portion of the insulating layer 700 may extend between the third surface 103 of the body 100 and the adhesive layer AL, so that the adhesive layer AL and a portion of the insulating layer 700 may overlap.

[0102] For example, the insulating layer 700 may be formed by applying and curing a material including an insulating resin to the surface of the body 100. In this case, the insulating layer 700 may include at least one of a thermoplastic resin (such as a polystyrene-based resin, a vinyl acetate-based resin, a polyester-based resin, a polyethylene-based resin, a polypropylene-based resin, a polyamide-based resin, a rubber-based resin, an acrylic resin, etc.), a thermosetting resin (such as a phenolic resin, an epoxy-based resin, a polyurethane-based resin, a melamine-based resin, an alkyd-based resin, etc.), and a photosensitive insulating resin.

[0103] The coil component 1000 ″ according to the present embodiment may reduce the risk of leakage current occurring along the surface of the body 100 between the pad parts 512 and 522 .

[0104] In addition, since the insulating layer 700 is interposed between the body 100 and the adhesive layer AL, the bonding force may be enhanced compared to the case where the adhesive layer AL is directly disposed on the body 100 .

[0105] Second embodiment Figure 7 is a perspective view schematically showing a coil component 2000 according to a second embodiment of the present disclosure.

[0106] Will Figure 7 and Figure 1 In comparison, the shapes of the land parts 512 and 522 of the coil component 2000 according to the present embodiment are different from those of the first embodiment.

[0107] Therefore, when describing the present embodiment, only the shapes of the pad parts 512 and 522 that are different from the first embodiment of the present disclosure will be described, and for the remaining components of the present embodiment, the description in the first embodiment of the present disclosure may be applied as it is.

[0108] Reference Figure 7 , the pad parts 512 and 522 of the coil component 2000 according to the present embodiment may be formed to have a constant width in the second direction W, and may be formed to have the same width as that of the body 100 .

[0109] As a result, the pad portions 512 and 522 of the coil component 2000 according to the present embodiment may have a larger area than the pad portions in the first embodiment. Therefore, since the area of ​​the first electrode portion 510 and the second electrode portion 520 surrounding the main body 100 is also increased, the physical bonding force between the first electrode portion 510 and the main body 100 and between the second electrode portion 520 and the main body 100 can be further enhanced.

[0110] In addition, the coil component 2000 according to the present embodiment may have large-area pad parts 512 and 522 , and thus a direct current resistance (Rdc) generated in the pad parts 512 and 522 may be reduced when the coil component 2000 is mounted on a printed circuit board (PCB).

[0111] In addition, when the first electrode portion 510 and the second electrode portion 520 are formed in a state where a plurality of coils 300 are connected to each other, the design process of the first electrode portion 510 and the second electrode portion 520 may also be simplified.

[0112] Fig. 8A yes Figure 7 Bottom view of FIG. 8B to FIG. 8E yes Fig. 8A A variation example of .

[0113] Reference Fig. 8A In this embodiment, the pad portions 512 and 522 may have an overall flat outer surface.

[0114] However, the scope of the present disclosure is not limited thereto, and the pad parts 512 and 522 may have at least one groove part GP formed on the outer surface, and the groove part GP may be modified into various forms as follows.

[0115] Reference Figure 8B , the groove portion GP may have a circular shape based on the LW cross section.

[0116] In addition, refer to Figure 8C , the groove portion GP may have a quadrilateral shape based on the LW cross section.

[0117] In addition, refer to Fig.8D , the groove portion GP may have a rhombus shape based on the LW cross section.

[0118] In addition, refer to Fig. 8E , the groove portion GP may have a straight line shape in the second direction based on the LW cross section.

[0119] The groove part GP may be formed as a through hole penetrating the pad parts 512 and 522 , but the present disclosure is not limited thereto, and the groove part GP may be formed in a form in which a region of the groove part GP is recessed without penetrating the pad parts 512 and 522 .

[0120] As in the present embodiment and the modified examples, when the pad parts 512 and 522 have at least one groove part GP, the surface area of ​​the outer surface of the pad parts 512 and 522 may be increased so that the bonding force may be enhanced when mounted on a printed circuit board (PCB).

[0121] In addition, when the groove portion GP is formed to penetrate the pad portions 512 and 522 , the groove portion GP may be filled with a bonding member such as solder when mounted on a printed circuit board (PCB), thereby increasing bonding force and preventing the component from rotating.

[0122] Third embodiment Fig. 9 is a perspective view schematically showing a coil component 3000 according to a third embodiment of the present disclosure. Fig.10 It is shown Fig. 9 An exploded perspective view of the connection relationship between coils 300 and 400. Fig.11 yes Fig. 9 Left side view. Fig.12 yes Fig. 9 Right side view.

[0123] Will Fig. 9 and Figure 1 In comparison, the components of the coils 300 and 400 , the support members 210 and 220 , and the electrode parts 510 , 520 , 530 , and 540 are different. That is, the coil component 3000 may further include a second coil 400 , a second support member 220 , a third electrode part 530 , and a fourth electrode part 540 .

[0124] Therefore, when describing the present embodiment, only the second coil 400, the second support member 220, the third electrode portion 530 and the fourth electrode portion 540 and the connection relationship between the components which are different from those of the first embodiment will be described, and the description in the first embodiment of the present disclosure can be applied as is to the remaining components of the present embodiment.

[0125] Reference Fig. 9 and Fig.10 , the coil component 3000 according to the present embodiment may include a first coil 300 and a second coil 400 that may be magnetically coupled when powered on.

[0126] The magnitude of the coupling coefficient k may be adjusted according to the interval between the first coil 300 and the second coil 400 , and the sign of the mutual inductance may be determined according to the winding directions of the first coil 300 and the second coil 400 .

[0127] In the case of the coil component 3000 according to the present embodiment, the first coil 300 and the second coil 400 may be wound in opposite directions, but the present disclosure is not limited thereto, and the first coil 300 and the second coil 400 may be wound in the same direction.

[0128] Reference Fig. 9 and Fig.10 The first coil pattern 311 and the second coil pattern 312 may be respectively disposed on both surfaces of the first support member 210 , and the first coil pattern 311 and the second coil pattern 312 may be connected through a first via hole 320 penetrating the first support member 210 .

[0129] Similarly, the third coil pattern 411 and the fourth coil pattern 412 may be respectively disposed on both surfaces of the second support member 220 , and the third coil pattern 411 and the fourth coil pattern 412 may be connected through a second via hole 420 penetrating the second support member 220 .

[0130] The first to fourth electrode portions 510 , 520 , 530 , and 540 may extend outward from the first to fourth lead-out portions 331 , 332 , 431 , and 432 , respectively, and may be bent toward the third surface 103 of the body 100 .

[0131] Reference Fig.11 and Fig.12 According to the present embodiment, each of the electrode portions 510, 520, 530 and 540 of the coil component 3000 may include extension portions 511, 521, 531 and 541 and pad portions 512, 522, 532 and 542, respectively, and each of the first extension portion 511, the second extension portion 521, the third extension portion 531 and the fourth extension portion 541 may have a different average length.

[0132] Specifically, Fig.11 The illustrated average length H31 of the first extension 511 may be longer than the average length H33 of the third extension 531 .

[0133] in addition, Fig.12 The average length H32 of the second extension 521 shown may be longer than the average length H34 of the fourth extension 541 .

[0134] In addition, refer to Figures 9 to 12 , an average length H31 of the first extension portion 511, an average length H32 of the second extension portion 521, an average length H33 of the third extension portion 531, and an average length H34 of the fourth extension portion 541 may satisfy H31>H32>H33>H34.

[0135] Coil assembly manufacturing process Figures 13 to 15 is a process diagram schematically showing a step-by-step manufacturing process of a coil component according to a first embodiment of the present disclosure, Fig.13 is a process diagram schematically illustrating operations for forming the coil component according to the first embodiment of the present disclosure. Fig.14 is a process diagram schematically illustrating a forming operation of a body of a coil component according to the first embodiment of the present disclosure. Fig.15 1 is a process diagram schematically illustrating a bending operation of an electrode portion of a coil component according to a first embodiment of the present disclosure.

[0136] The process of forming the coil component according to the present embodiment may be performed in a state where the plurality of coils 300 are connected to each other in the coil bar, and the bending process of the first and second electrode parts 510 and 520 may be performed based on separate components after cutting.

[0137] Reference Fig.13 First, the thin coil 300P and the first and second electrode parts 510 and 520 may be formed on both surfaces of the support member 210 by primary plating to a thickness of the first and second electrode parts 510 and 520 .

[0138] Next, a plating resist may be disposed only on the first electrode portion 510 and the second electrode portion 520 , and then only the coil pattern may be grown to a desired thickness through secondary plating.

[0139] Next, when the plating resist having completed the dam mask function is removed, a structure in which the coil 300 and the thin electrode parts 510 and 520 are integrated may be realized.

[0140] Reference Fig.14 , the dummy component DM can be set in Fig.13The coil 300 implemented in the embodiment and the first and second electrode parts 510 and 520 are placed above and below the coil 300, and the magnetic sheet MS can be compressed in the vertical direction and hardened to form the body 100. Thereafter, the coil component 1000 having the exposed thin electrode parts 510 and 520 can be obtained as individual component units through a cutting process.

[0141] Reference Fig.15 , can be bent downward through the curved member BM Fig.14 The first electrode part 510 and the second electrode part 520 of the coil component obtained in the embodiment apply pressure so that the first electrode part 510 and the second electrode part 520 may be bent to closely contact with the side surface of the body 100 .

[0142] Next, the first and second electrode parts 510 and 520 may be disposed on the guide member GM, and pressure is applied downward to bend the first and second electrode parts 510 and 520 again so as to closely contact the lower surface of the body 100 .

[0143] Through the above manufacturing process, the coil component 1000 according to the first embodiment of the present disclosure may be realized.

[0144] As described above, according to an aspect of the present disclosure, connection reliability between the coil and the external electrode may be maintained within the coil component despite vibration or external impact.

[0145] According to another aspect of the present disclosure, a physical coupling force between the electrode part and the body may be enhanced through a structure in which the electrode part is bent to surround the body.

[0146] While example embodiments have been shown and described above, it will be readily apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: a main body, comprising a first surface and a second surface opposite to each other in a first direction, and a third surface connecting the first surface and the second surface; A support member, disposed in the main body; a coil disposed on the support member 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 The electrode portion extends from the lead portion to the outside of the main body and is disposed on the main body, and has an average thickness smaller than an average thickness of the lead portion.

2. The coil assembly according to claim 1, wherein: The electrode portion is formed integrally with the lead portion.

3. The coil assembly according to claim 1, wherein: The electrode portion is directly connected to the lead-out portion, and includes an extension portion provided on the first surface or the second surface and a pad portion provided on the third surface.

4. The coil assembly according to claim 3, wherein: The extending portion includes a bent portion that is bent toward the third surface in a region that contacts the lead-out portion, and An outer surface of the curved portion includes a curved surface.

5. The coil assembly according to claim 3, wherein: The extension portion has a constant width in a second direction perpendicular to the first direction.

6. The coil assembly according to claim 3, wherein: The width of the extension portion in a second direction perpendicular to the first direction is greatest in a region contacting the pad portion.

7. The coil assembly according to claim 3, wherein: The width of the extension portion in a second direction perpendicular to the first direction is smallest in a region contacting the pad portion.

8. The coil assembly according to claim 3, wherein: The width of the extending portion in a second direction perpendicular to the first direction is greatest in a central region of the extending portion.

9. The coil assembly according to claim 3, wherein: The width of the pad portion in a second direction perpendicular to the first direction is largest in a region closest to the center of the third surface.

10. The coil assembly according to claim 9, wherein: The width of the pad portion in the second direction gradually increases toward the center of the third surface.

11. The coil assembly according to claim 9, wherein: The width of the pad portion in the second direction is smallest in a region contacting the extension portion.

12. The coil assembly according to claim 3, wherein: At least one groove portion is formed on an outer surface of the pad portion.

13. The coil assembly according to claim 12, wherein: The at least one groove portion penetrates the pad portion.

14. The coil assembly according to claim 3, wherein: An adhesive layer is provided between the pad portion and the third surface.

15. The coil assembly according to claim 14, wherein: The adhesive layer includes epoxy resin.

16. The coil assembly according to claim 14, wherein: The adhesive layer includes a plurality of layers.

17. The coil assembly according to claim 14, wherein: An insulating layer is disposed on the third surface, and at least a portion of the insulating layer extends between the third surface and the adhesive layer.

18. The coil assembly according to claim 3, wherein: The electrode portion further includes a first metal layer disposed on the pad portion.

19. The coil assembly according to claim 18, wherein: The electrode portion further includes a second metal layer disposed on the first metal layer.

20. The coil assembly according to claim 1, wherein The average thickness of the electrode part is smaller than an average thickness of the support member.

21. The coil assembly according to claim 1, wherein: The coil pattern includes a first coil pattern disposed on one surface of the support member and a second coil pattern disposed on the other surface of the support member, The lead-out portion includes a first lead-out portion extending from the first coil pattern toward the first surface and a second lead-out portion extending from the second coil pattern toward the second surface. The electrode portion includes a first electrode portion extending from the first lead portion and disposed on the first surface, and a second electrode portion extending from the second lead portion and disposed on the second surface, and Each of the first electrode portion and the second electrode portion also extends onto the third surface.

22. The coil assembly according to claim 21, wherein The first electrode portion is directly connected to the first lead portion and includes a first extension portion disposed on the first surface and a first pad portion disposed on the third surface. The second electrode portion is directly connected to the second lead portion and includes a second extension portion disposed on the second surface and a second pad portion disposed on the third surface. An average length of the first extension portion between the first lead portion and the first pad portion is different from an average length of the second extension portion between the second lead portion and the second pad portion.

23. The coil assembly according to claim 22, wherein: The average length of the first extension portion between the first lead portion and the first pad portion is longer than the average length of the second extension portion between the second lead portion and the second pad portion.

24. A coil assembly, comprising: main body; a first coil and a second coil disposed in the body and having at least one turn; A first electrode portion and a second electrode portion respectively extend from two ends of the first coil to the outside of the main body and are arranged on the main body; as well as The third electrode portion and the fourth electrode portion extend from both ends of the second coil to the outside of the main body, respectively, and are arranged on the main body. wherein an average thickness of each of the first electrode portion and the second electrode portion is smaller than an average thickness of the first coil, and An average thickness of each of the third electrode portion and the fourth electrode portion is smaller than an average thickness of the second coil.

25. The coil assembly according to claim 24, wherein: The first coil and the second coil are spaced apart from each other and are wound in opposite directions.

26. The coil assembly according to claim 24, wherein: The first electrode portion and the second electrode portion are formed integrally with the first coil, and The third electrode portion and the fourth electrode portion are formed integrally with the second coil.

27. The coil assembly according to claim 24, wherein: The body includes a first surface and a second surface opposite to each other in a first direction, and a third surface connecting the first surface and the second surface. The first electrode portion and the third electrode portion are disposed on the first surface and extend onto the third surface, and The second electrode portion and the fourth electrode portion are disposed on the second surface and extend onto the third surface.

28. The coil assembly according to claim 27, wherein: The average lengths of each of the first electrode portion and the third electrode portion provided on the first surface are different from each other, and Average lengths of each of the second electrode section and the fourth electrode section provided on the second surface are different from each other.

29. The coil assembly of claim 24, further comprising: a first supporting member, the first coil being disposed on the first supporting member; as well as A second supporting member, the second coil is disposed on the second supporting member.

30. A coil assembly comprising: main body; A support member, disposed in the main body; a coil disposed on the support member within the body and having at least one turn; as well as an electrode portion extending from the lead-out portion of the coil toward the outside of the body and disposed on the outer surface of the body to serve as an external electrode, wherein the electrode portion includes a reduced thickness portion at one end of the coil, and The electrode portion is formed integrally with the lead portion.

31. The coil assembly according to claim 30, wherein: An average thickness of the electrode portion is smaller than an average thickness of the lead portion.

32. The coil assembly according to claim 30, wherein: The electrode portion is disposed on two connected surfaces of the body.

33. The coil assembly according to claim 30, wherein: The body includes a first surface and a second surface opposite to each other in a first direction, and a third surface connecting the first surface and the second surface, and The electrode portion includes an extension portion provided on the first surface or the second surface and a pad portion provided on the third surface.

34. The coil assembly according to claim 33, wherein: The extension portion has a constant width in a second direction perpendicular to the first direction, The width of the pad portion in the second direction gradually increases toward the center of the third surface of the body, and A portion of the pad portion having the smallest width in the second direction is spaced apart from the first surface or the second surface.

35. The coil assembly according to claim 34, wherein The extension portion further extends onto the third surface.

36. The coil assembly of claim 33, wherein: The extension is in contact with an exposed surface of the support member.

Images