Coil assembly

Abstract

The present invention provides a coil assembly comprising: a wound coil including a coil portion and a first lead and a second lead respectively connected to the coil portion; a body in which the wound coil is disposed, the first lead and the second lead of the wound coil being exposed from the body; a noise removal portion including a patterned portion and a third lead, the patterned portion being spaced apart from the metal wire of the wound coil in the body and having two spaced-apart ends to have an open loop, the third lead being connected to the patterned portion and exposed from the body; an insulating layer disposed between the wound coil and the noise removal portion; and a first external electrode, a second external electrode, and a third external electrode disposed on the body spaced apart from each other and respectively connected to the first lead, the second lead, and the third lead.

Description

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2020-0065100, filed on May 29, 2020, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

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

[0003] An example of a coil assembly is a wire-wound coil assembly. In the case of a wire-wound coil assembly, a wire-wound coil can be made by winding a coated metal wire in a coil shape.

[0004] As electronic devices become more high-performance and smaller, the number of electronic components used in such devices can increase, the electronic components can be miniaturized, and the operating frequency of the electronic components can be increased.

[0005] For these reasons, the likelihood of problems due to the relatively high-frequency noise of the coil assembly increases. Summary of the Invention

[0006] One aspect of this disclosure is to provide a coil assembly capable of easily removing high-frequency noise.

[0007] According to one aspect of this disclosure, a coil assembly includes: a wound coil including a coil portion and a first lead and a second lead respectively connected to the coil portion; a body in which the wound coil is disposed, the first lead and the second lead of the wound coil being exposed from the body; a noise removal portion including a patterned portion and a third lead, the patterned portion being spaced apart from the metal wire of the wound coil in the body and having two spaced-apart ends to have an open loop, the third lead being connected to the patterned portion and exposed from the body; an insulating layer disposed between the wound coil and the noise removal portion; and a first external electrode, a second external electrode, and a third external electrode disposed on the body, spaced apart from each other and respectively connected to the first lead, the second lead, and the third lead. Attached Figure Description

[0008] The above and other aspects, features and advantages of this disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

[0009] Figure 1 This is a schematic diagram illustrating a coil assembly according to a first embodiment of the present disclosure.

[0010] Figure 2 It shows along Figure 1A diagram showing the cross section taken by line I-I'.

[0011] Figure 3 It shows along Figure 1 A diagram showing the cross section taken from line II-II'.

[0012] Figure 4 It is a schematic representation when viewed from above. Figure 1 The diagram is shown when the image is displayed.

[0013] Figure 5 yes Figure 2 An enlarged view of part A.

[0014] Figure 6 This is a diagram illustrating the signal transmission characteristics (S-parameters) of a coil assembly according to a first embodiment and a comparative example of this disclosure.

[0015] Figure 7 This is an illustrative example of a first modification of the first embodiment of this disclosure and is related to... Figure 4 The corresponding diagram.

[0016] Figure 8 This is an illustrative example of a second modification to the first embodiment of this disclosure and is related to... Figure 5 The corresponding diagram.

[0017] Figure 9 This is an illustrative example of a third modification to the first embodiment of this disclosure and is related to... Figure 3 The corresponding diagram.

[0018] Figure 10 This schematically illustrates a coil assembly according to a second embodiment of the present disclosure and is related to... Figure 2 The corresponding diagram.

[0019] Figure 11 This schematically illustrates a coil assembly according to a second embodiment of the present disclosure and is related to... Figure 3 The corresponding diagram.

[0020] Figure 12 yes Figure 10 An enlarged view of part B.

[0021] Figure 13 This is an illustrative example of a modification to the second embodiment of this disclosure and is related to... Figure 12 The corresponding diagram.

[0022] Figure 14 This is a schematic diagram illustrating a coil assembly according to a third embodiment of the present disclosure.

[0023] Figure 15This is an exploded view of the noise removal section and the wound coil of the coil assembly applied according to the third embodiment of the present disclosure.

[0024] Figure 16 It shows along Figure 14 A diagram showing the cross section taken from line III-III'.

[0025] Figure 17 It shows along Figure 14 A diagram showing the cross section taken by line IV-IV'.

[0026] Figure 18 This is an illustrative example of a modification to the third embodiment of this disclosure and is related to... Figure 17 The corresponding diagram.

[0027] Figure 19 This is a schematic diagram illustrating a coil assembly according to a fourth embodiment of the present disclosure.

[0028] Figure 20 It is shown schematically. Figure 19 A diagram of the molding section.

[0029] Figure 21 It shows along Figure 19 A diagram showing the cross section taken by line V-V'.

[0030] Figure 22 It shows along Figure 19 A diagram showing the cross section taken by line VI-VI'. Detailed Implementation

[0031] The terminology used in the description of this disclosure is for describing particular embodiments and is not intended to limit the disclosure. Unless otherwise indicated, singular terms include plural forms. Terms such as “comprising,” “including,” “constructed as,” etc., in the description of this disclosure are used to indicate the presence of features, quantities, steps, operations, elements, components, or combinations thereof, without excluding the possibility of combining or adding one or more additional features, quantities, steps, operations, elements, components, or combinations thereof. Furthermore, terms such as “set on,” “located on,” etc., may indicate that an element is located on or below an object, and do not necessarily mean that the element is above the object with respect to the direction of gravity.

[0032] The terms “joined to” and “combined to” can indicate not only that elements are in direct and physical contact with each other, but can also include a configuration in which another element is placed between the elements so that the element is also in contact with the other element.

[0033] For ease of description, the dimensions and thicknesses of the elements shown in the accompanying drawings are illustrated by way of example, and this disclosure is not limited thereto.

[0034] In the attached figures, the X direction is the first direction or length direction of the main body, the Y direction is the second direction or width direction of the main body, and the Z direction is the third direction or thickness direction of the main body.

[0035] In the following, a coil assembly according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. Referring to the drawings, the same or corresponding components may be designated by the same reference numerals, and repeated descriptions will be omitted.

[0036] In electronic devices, various types of electronic components can be used, and various types of coil assemblies can be used between electronic components to remove noise or for other purposes.

[0037] In other words, in electronic devices, coil assemblies can be used as power inductors, high-frequency (HF) inductors, ordinary ferrite beads, high-frequency (GHz) ferrite beads, common-mode filters, etc.

[0038] First Implementation Example & Modification Example

[0039] Figure 1 This is a schematic diagram illustrating a coil assembly according to a first embodiment of the present disclosure. Figure 2 It shows along Figure 1 A diagram showing the cross section taken by line I-I'. Figure 3 It shows along Figure 1 A diagram showing the cross section taken from line II-II'. Figure 4 It is a schematic representation when viewed from above. Figure 1 The diagram is shown when the image is displayed. Figure 5 yes Figure 2 An enlarged view of part A. Figure 6 This is a diagram illustrating the signal transmission characteristics (S-parameters) of a coil assembly according to a first embodiment and a comparative example of this disclosure.

[0040] Reference Figures 1 to 5 According to the first embodiment of the present disclosure, the coil assembly 1000 may include a main body 100, a wound coil 200, a noise removal part 300, and a first external electrode 410, a second external electrode 420, and a third external electrode 430.

[0041] The body 100 may form the appearance of the coil assembly 1000 according to this embodiment, and the wound coil 200 may be embedded in the body 100.

[0042] The main body 100 can be formed into a hexahedral shape as a whole.

[0043] Reference Figure 1The main body 100 may include a first surface 101 and a second surface 102 opposite to each other in the longitudinal direction X of the main body 100, a third surface 103 and a fourth surface 104 opposite to each other in the width direction Y of the main body 100, and a fifth surface 105 and a sixth surface 106 opposite to each other in the thickness direction Z of the main body 100. Each of the first surface 101, the second surface 102, the third surface 103, and the fourth surface 104 of the main body 100 may correspond 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. In the following, the two end surfaces of the main body 100 may refer to the first surface 101 and the second surface 102 of the main body 100, and the two side surfaces of the main body 100 may refer to the third surface 103 and the fourth surface 104 of the main body 100. In addition, one surface and the other surface of the main body 100 may refer to the sixth surface 106 and the fifth surface 105 of the main body 100, respectively.

[0044] The main body 100 may, for example, be configured such that the coil assembly 1000 according to this embodiment (in which the first external electrode 410, the second external electrode 420, and the third external electrode 430, which will be described later, are formed) have a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.65 mm, but is not limited thereto. Since the above values ​​are merely design values ​​that do not reflect process errors, values ​​that reach the level of being identified as process errors should be considered to fall within the scope of this disclosure.

[0045] The length, width, and thickness of the coil assembly 1000 described above can be measured using a micrometer. The micrometer measurement is performed by zeroing a micrometer (device) equipped with Gage R&R technology (gauge repeatability and reproducibility technology), inserting the coil assembly 1000 between the tips of the micrometer, and rotating the measuring rod. When measuring the length of the coil assembly 1000 using the micrometer method, the length can refer to a single measurement or the arithmetic mean of multiple measurements. The same applies to the width and thickness of the coil assembly 1000.

[0046] The length, width, and thickness of the coil assembly 1000 described above can be measured using cross-sectional analysis. As an example, a method for measuring the length of the coil assembly 1000 using cross-sectional analysis will be described. Based on photographs of a cross-section of the body 100 at its central portion in the width direction Y, taken using an optical microscope or scanning electron microscope (SEM), the length of the coil assembly 1000 can be defined as the maximum length of a plurality of line segments parallel to the length direction X of the body 100 and connecting the outermost boundary line of the coil assembly 1000. Alternatively, as shown in the photographs, the length of the coil assembly 1000 can be defined as the minimum length of a plurality of line segments parallel to the length direction X of the body 100 and connecting the outermost boundary line of the coil assembly 1000. Alternatively, as shown in the photographs, the length of the coil assembly 1000 can be defined as the arithmetic mean of at least three lengths of a plurality of line segments parallel to the length direction X of the body 100 and connecting the outermost boundary line of the coil assembly 1000. This can be applied similarly to the width and thickness of the coil assembly 1000.

[0047] The body 100 may include a magnetic material and a resin. Specifically, the body 100 may be formed by stacking one or more magnetic composite sheets comprising a resin and a magnetic material dispersed in the resin. The body 100 may have a structure other than one in which the magnetic material is dispersed in the resin. For example, the body 100 may be made using a magnetic material such as ferrite.

[0048] Magnetic materials can be ferrite powder particles or metallic magnetic powder particles.

[0049] Examples of ferrite powder particles may include at least one of spinel-type ferrites (such as Mg-Zn-based ferrites, Mn-Zn-based ferrites, Mn-Mg-based ferrites, Cu-Zn-based ferrites, Mg-Mn-Sr-based ferrites, Ni-Zn-based ferrites, etc.), hexagonal ferrites (such as Ba-Zn-based ferrites, Ba-Mg-based ferrites, Ba-Ni-based ferrites, Ba-Co-based ferrites, Ba-Ni-Co-based ferrites, etc.), garnet-type ferrites (such as Y-based ferrites, etc.), and Li-based ferrites.

[0050] The metallic magnetic powder particles may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metallic magnetic powder particles may be at least one selected from pure iron powder, Fe-Si based alloy powder, Fe-Si-Al based alloy powder, Fe-Ni based alloy powder, Fe-Ni-Mo based alloy powder, Fe-Ni-Mo-Cu based alloy powder, Fe-Co based alloy powder, Fe-Ni-Co based alloy powder, Fe-Cr based alloy powder, Fe-Cr-Si based alloy powder, Fe-Si-Cu-Nb based alloy powder, Fe-Ni-Cr based alloy powder, and Fe-Cr-Al based alloy powder.

[0051] The metallic magnetic powder particles can be amorphous or crystalline. For example, the metallic magnetic powder particles can be Fe-Si-B-Cr based amorphous alloy powder particles, but are not limited to this.

[0052] Ferrite powder particles and metallic magnetic powder particles may each have an average diameter of about 0.1 μm to 30 μm, but are not limited thereto.

[0053] The body 100 may include two or more types of magnetic materials dispersed in the resin. In this context, the term "different types of magnetic materials" means that the magnetic materials dispersed in the resin are distinguished from each other by average diameter, composition, crystallinity, and shape.

[0054] The resin may include, but is not limited to, epoxy resins, polyimides, liquid crystal polymers, etc., in single or combined forms.

[0055] The main body 100 may include a core C (described later) that penetrates the central portion of each of the coil portion 210 of the wound coil 200 and the patterned portion 310 of the noise removal portion 300. The core C may be formed by filling the through holes formed in the central portions of each of the coil portion 210 and the noise removal portion 300 with a magnetic composite sheet, but is not limited thereto.

[0056] The wound coil 200 can exhibit the characteristics of a coil assembly. For example, when the coil assembly 1000 of this embodiment is used as a power inductor, the wound coil 200 can stabilize the power of the electronic device by storing the electric field as a magnetic field and maintaining the output voltage.

[0057] A wound coil 200 may be disposed within a body 100, and a first lead-out portion 221 and a second lead-out portion 222 may be exposed from the surface of the body 100. Specifically, the wound coil 200 may include a coil portion 210 forming at least one turn around a core C of the body 100, and a first lead-out portion 221 and a second lead-out portion 222 connected to the coil portion 210 and exposed from a first surface 101 and a second surface 102 of the body 100, respectively. The wound coil 200 may be formed by winding a metal wire, such as copper wire (Cu wire), including the metal wire and a coating CL covering the surface of the metal wire. Therefore, the entire surface of each of the plurality of turns of the wound coil 200 may be coated with the coating CL. The metal wire may be a rectangular wire, but is not limited thereto. When the wound coil 200 is formed using a rectangular wire, for example, as Figure 2 and Figure 3 As shown, each turn of the wound coil 200 may have a rectangular cross-section.

[0058] The coil portion 210 may form an innermost turn, at least one intermediate turn, and an outermost turn from the core C toward the outside of the body 100 along the length direction X or the width direction W of the body 100. The coil portion 210 may have an upper surface and a lower surface (generally resembling a ring shape) and an inner surface and an outer surface connecting the upper surface and the lower surface, thus generally having a cylindrical shape with a cylindrical hollow portion formed in the central portion. The coil portion 210 may be a hollow coil, and the core C may be disposed in the hollow of the coil portion 210.

[0059] The first lead-out portion 221 and the second lead-out portion 222 can be the two ends of a wound coil 200, and can be exposed from the first surface 101 and the second surface 102 of the body 100 to be spaced apart from each other. The first lead-out portion 221 and the second lead-out portion 222 can be retained after the coil portion 210 is formed in a metal wire (such as copper wire whose surface is covered with a coating CL). As a result, no boundary can be formed between the first lead-out portion 221 and the second lead-out portion 222 and the coil portion 210. Furthermore, similar to the coil portion 210, the coating CL can be formed on the surfaces of the first lead-out portion 221 and the second lead-out portion 222.

[0060] The coating CL may include, but is not limited to, epoxy resins, polyimides, liquid crystal polymers, etc., in a single or combined form.

[0061] The noise removal section 300 may be configured to be electrically insulated from the wound coil 200 in the body 100 to discharge high-frequency noise transmitted to and / or generated from the coil assembly 1000 according to this embodiment to the outside of the coil assembly 1000 (such as a mounting substrate). For example, the patterned section 310 and the metal wires of the wound coil 200 may be spaced apart from each other by a coating CL. Specifically, the noise removal section 300 may include a patterned section 310 having two ends spaced apart from each other to form an open loop, and a third lead-out section 320 extending from the patterned section 310 to be exposed from the surface of the body 100. In this embodiment, the noise removal section 300 may be configured such that the patterned section 310 contacts the coating CL of the wound coil 200 forming the upper surface of the coil section 210. As a result, the patterned section 310 and the coil section 210 may be capacitively coupled by the coating CL to form a capacitor. Since the patterned portion 310 and the coil portion 210 form a capacitor through the coating CL, high-frequency noise transmitted to the conductor elements of the wound coil 200 and / or high-frequency noise generated from the conductor elements of the wound coil 200 can be transmitted to the patterned portion 310, and the high-frequency noise transmitted to the patterned portion 310 can be transmitted to the third external electrode 430 through the third lead 320 connected to the patterned portion 310. In this case, when designing the coil assembly 1000 according to this embodiment, the term "high-frequency noise" may refer to a signal having a frequency exceeding the upper limit of the frequency range set as the operating frequency. As a non-limiting example, in this embodiment, high-frequency noise may refer to a signal of 600 MHz or higher.

[0062] The pattern portion 310 has two spaced-apart ends to form an open loop. For example, the pattern portion 310 may be formed with a loop shape (generally corresponding to the shape of the upper surface of the coil portion 210), but a gap S may be formed in the pattern portion 310 to form an open loop. The two ends of the pattern portion 310 can be separated from each other by the gap S, and the pattern portion 310 forms an open loop. In this case, "the pattern portion 310 can form an open loop" may refer to, for example... Figure 4 As shown, the patterned portion 310 may have a plate-shaped ring (with a through hole formed in the central portion), but due to gaps S, one end and the other end of the patterned portion 310 may be completely spaced apart from each other to form a structure that does not contact each other. Optionally, "the patterned portion 310 may form an open loop" may refer to a structure in which a virtual path starting from one end of the patterned portion 310 toward the other end of the patterned portion 310 does not loop back to one end of the patterned portion 310. Additionally, the open loop of the patterned portion 310 may include one end completely disposed within the body 100. This is acceptable as long as the patterned portion 310 satisfies the condition that one end and the other end may be spaced apart from each other to form an open loop (e.g., Figure 1 , Figure 4(as shown in the examples), and the inner and outer surfaces may all be formed in a circular shape, but are not limited thereto. As another example, the patterned portion 310 may be formed in a ring shape with an inner surface that is completely circular and an outer surface that is completely rectangular.

[0063] In the conductive pattern provided in the body 100, the pattern portion 310 may be connected only to the third lead 320. The third lead 320 may extend from the pattern portion 310 and may be exposed from the surface of the body 100. Specifically, in this embodiment, the third lead 320 may extend from the pattern portion 310 and may be exposed from the third surface 103 of the body 100. The third lead 320 may be connected to the third external electrode 430, which will be described later.

[0064] The noise removal section 300 may be formed in the same process into an integral shape, with no boundary between the patterned section 310 and the third lead-out section 320, but the scope of this disclosure is not limited thereto.

[0065] The patterned portion 310 can be configured to correspond to an area of ​​the coil portion 210 on which the wound coil 200 is disposed. For example, the area of ​​the patterned portion 310 can correspond to an area of ​​the upper surface of the coil portion 210. In this case, "the area of ​​the patterned portion 310 can correspond to an area of ​​the upper surface of the coil portion 210" can refer to the center of the two (e.g., Figure 1 The center line of the core C is basically the same, and the areas of the two are basically the same. For example, based on Figure 2 The cross-section shown shows the line width of the patterned portion 310 (the line width of the patterned portion 310 in...). Figure 2 The distance in the X direction can be approximately equal to the distance between the innermost surface of the coil portion 210 closest to the core C and the outermost surface of the coil portion 210 furthest from the core C. Since the pattern portion 310 is configured to correspond to the coil portion 210, the overlap area between the conductor elements of the pattern portion 310 and the coil portion 210 can be maximized. Therefore, the capacitance generated between the pattern portion 310 and the coil portion 210 can be increased, and the effect for removing high-frequency noise can be improved.

[0066] The noise removal unit 300 may be formed using conductive materials such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), or alloys thereof, but is not limited thereto.

[0067] The first external electrode 410, the second external electrode 420, and the third external electrode 430 may be spaced apart from each other on the surface of the main body 100 and may be connected to the first lead-out portion 221, the second lead-out portion 222, and the third lead-out portion 320, respectively. Specifically, the first external electrode 410 may be disposed on the first surface 101 of the main body 100 to contact and connect to the first lead-out portion 221 of the wound coil 200 exposed from the first surface 101 of the main body 100. The second external electrode 420 may be disposed on the second surface 102 of the main body 100 to contact and connect to the second lead-out portion 222 of the wound coil 200 exposed from the second surface 102 of the main body 100. The third external electrode 430 may be disposed on the third surface 103 of the main body 100 to contact and connect to the third lead-out portion 320 of the noise removal portion 300 exposed from the third surface 103 of the main body 100. Each of the first external electrode 410, the second external electrode 420, and the third external electrode 430 may extend to the sixth surface 106 of the body 100, but may be spaced apart from each other on the sixth surface 106 of the body 100. Additionally, each of the first external electrode 410 and the second external electrode 420 may extend from the first surface 101 and the second surface 102 of the body 100 to a portion of each of the third surface 103, the fourth surface 104, and the fifth surface 105 of the body 100, and the third external electrode 430 may extend to the fifth surface 105 of the body 100. Figure 1 The shapes of the first external electrode 410, the second external electrode 420, and the third external electrode 430 shown are merely illustrative, and the scope of this disclosure is not limited thereto. For example, each of the first external electrode 410 and the second external electrode 420 may be modified to have a shape that does not extend to a portion of each of the third surface 103, the fourth surface 104, and the fifth surface 105 of the body 100, such as having an L-shape, etc.

[0068] When the coil assembly 1000 according to this embodiment is mounted on a mounting substrate such as a printed circuit board, the first external electrode 410 and the second external electrode 420 can electrically connect the coil assembly 1000 to the mounting substrate. The first external electrode 410 and the second external electrode 420 can be signal electrodes of the coil assembly 1000 according to this embodiment. The coil assembly 1000 according to this embodiment can be mounted such that the sixth surface 106 of the body 100 faces the upper surface of the printed circuit board, and the first external electrode 410 and the second external electrode 420 extending to the sixth surface 106 of the body 100 can be electrically connected to the connection portion of the printed circuit board through a conductive bonding member such as solder.

[0069] When the coil assembly 1000 according to this embodiment is mounted on a mounting substrate or the like, the third external electrode 430 can be connected to a grounding element of the mounting substrate; or when the coil assembly 1000 according to this embodiment is packaged in an electronic component package, the third external electrode 430 can be connected to a grounding element of the electronic component package. The third external electrode 430 can be a grounding electrode of the coil assembly 1000 according to this embodiment.

[0070] Each of the first external electrode 410, the second external electrode 420, and the third external electrode 430 may include at least one of a conductive resin layer and an electroplated layer. The conductive resin layer may be formed by printing conductive paste onto the surface of the body 100 and curing the printed conductive paste, and may include any one or more conductive metals selected from the group consisting of copper (Cu), nickel (Ni), and silver (Ag), as well as a thermosetting resin. The electroplated layer may include any one or more metals selected from the group consisting of nickel (Ni), copper (Cu), and tin (Sn).

[0071] A first insulating layer 510 may be provided between the noise removal section 300 and the main body 100. The first insulating layer 510 may be formed along the upper and side surfaces of the noise removal section 300 to contact the coating CL formed on the upper surface of the coil section 210 through the gap S formed in the patterned section 310, but is not limited thereto. Alternatively, the first insulating layer 510 may not be provided on the exposed surface of the third lead-out section 320 exposed from the third surface 103 of the main body 100. Figure 3 The second insulating layer 520 can cover the lower surface of the third lead 320 that is not coated with insulating material.

[0072] Each of the first insulating layer 510 and the second insulating layer 520 may include, but is not limited to, epoxy resin, polyimide, liquid crystal polymer, etc., in a single or combined form.

[0073] The noise removal section 300, the first insulating layer 510, and the second insulating layer 520 can be formed using edge-wise metal wire. In this case, the first insulating layer 510 and the second insulating layer 520 can correspond to the coating of the metal wire, so that no boundary is formed between them. After performing the gap S treatment on the metal wire, the coating of the metal wire can be partially removed, so that the coating CL of the coil section 210 and the conductor element of the metal wire come into contact with each other.

[0074] Figure 6 These are diagrams showing the signal transmission characteristics (S-parameters) of the experimental example and the comparative example, respectively.

[0075] The comparative example is a coil assembly excluding the noise removal section 300, and the experimental example is a coil assembly including the noise removal section 300. In both the comparative and experimental examples, all conditions are identical except for the presence or absence of the noise removal section 300. For example, the number of turns of the coil, the diameter of the metal wire constituting the coil, and the size of the main body can all be the same in both examples. In both the comparative and experimental examples, the signal transmission characteristics between ports are confirmed using a three-dimensional electromagnetic simulator (HFSS) with the first external electrode as the input terminal and the second external electrode as the output terminal (S21). In both the comparative and experimental examples, the signal transmission characteristics at frequencies of 600MHz, 800MHz, and 1GHz are confirmed (S21). In summary, the results are shown in Table 1 below.

[0076] [Table 1]

[0077]

[0078] Reference Figure 6 As shown in Table 1, high-frequency signals are removed better in the experimental examples compared to the comparative examples. For example, it can be seen that the comparative example without a noise removal section allows relatively high-frequency signals to pass through. This means that high-frequency signals can be transmitted relatively well from the input terminal to the output terminal, and that the effect of removing high-frequency noise is negligible. It can also be seen that the experimental example with a noise removal section does not allow relatively high-frequency signals to pass through well. As a result, it can be seen that when comparing the experimental examples and the comparative examples, the experimental examples effectively prevent unwanted high-frequency noise.

[0079] Figure 7 This is an illustrative example of a first modification of the first embodiment of this disclosure and is related to... Figure 4 The corresponding diagram.

[0080] Reference Figure 4 and Figure 7 In the first embodiment, the position of the slit S in the patterned portion 310 can be varied. Specifically, in this modified example, refer to... Figure 7The distance d1 from one end of the pattern portion 310 to the third surface 103 of the body 100 can be greater than or equal to the distance d2 from the other end of the pattern portion 310 to the fourth surface 104 of the body 100. In this case, the distance d1 from one end of the pattern portion 310 to the third surface 103 of the body 100 can refer to the shortest straight-line distance d1 from the center of the inner wall side surface of the forming slit S at one end of the pattern portion 310 in the linewidth direction to the third surface 103 of the body 100. Furthermore, the distance d2 from the other end of the pattern portion 310 to the fourth surface 104 of the body 100 can refer to the shortest straight-line distance d2 from the center of the inner wall side surface of the forming slit S at the other end of the pattern portion 310 in the linewidth direction to the fourth surface 104 of the body 100. In this modified example, since the gap S can be formed in the region of the patterned portion 310 adjacent to the fourth surface 104 of the body 100, the path of high-frequency noise transmitted to the patterned portion 310 can be minimized. For example, the effect of removing high-frequency noise can be improved.

[0081] Figure 8 This is an illustrative example of a second modification to the first embodiment of this disclosure and is related to... Figure 5 The corresponding diagram.

[0082] Reference Figure 5 and Figure 8 In the first embodiment, the structure of the patterned portion 310 can be modified. Specifically, the patterned portion 310 may include a first conductive layer 311 disposed on a coating CL on the upper surface of the coil forming portion 210, and a second conductive layer 312 disposed on the first conductive layer 311. The first conductive layer 311 may be a seed layer for forming the second conductive layer 312 by an electroplating process, and the second conductive layer 312 may be an electroplated layer deposited on the first conductive layer 311. The first conductive layer 311 may be formed by a vapor deposition process such as sputtering or electroless plating. Each of the first conductive layer 311 and the second conductive layer 312 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof, but is not limited thereto. In this modified example, only the patterned portion 310 has been described, but the above description can also be applied to the third lead-out portion 320.

[0083] Figure 9 This is an illustrative example of a third modification to the first embodiment of this disclosure and is related to... Figure 3 The corresponding diagram.

[0084] Reference Figure 3 and Figure 9In the first embodiment, the structure of the third external electrode 430 can be modified. Specifically, the third external electrode 430 can be formed to extend from the third surface 103 of the body 100 via the sixth surface 106 to the fourth surface 104. Alternatively, the third external electrode 430 can be formed to extend to the fifth surface 105 of the body 100. For example, the third external electrode 430 can be entirely formed into a ring shape having a rectangular cross-section in which a portion of the upper side is removed.

[0085] Optionally, with Figure 9 Unlike other examples, the third external electrode 430 in this modified example can be formed as a separate portion disposed on the third surface 103 of the body 100 and having two ends extending to the fifth surface 105 and the sixth surface 106 of the body 100, and another portion disposed on the fourth surface 104 of the body 100 and having two ends extending to the fifth surface 105 and the sixth surface 106 of the body 100, respectively. The portion and the other portion of the third external electrode 430 may not be in contact with each other and may be disposed on the fifth surface 105 and the sixth surface 106 spaced apart from each other. In this case, when the coil assembly according to this modified example is mounted, the other portion of the third external electrode 430 can be used as a non-contact terminal to connect to a grounding element such as a mounting substrate, or to a grounding element of the package. When the third external electrode 430 is formed on the third surface 103 and the fourth surface 104 of the body 100 by a TWA printing process or the like, the aforementioned separate structure of the third external electrode 430 can be easily formed.

[0086] The first insulating layer 510 and the second insulating layer 520 disposed on the surface of the noise removal section 300 may be optional structures that can be omitted in this embodiment and its modified examples.

[0087] Furthermore, although not shown, the external insulating layer may be formed in areas other than the areas where the first external electrode 410, the second external electrode 420, and the third external electrode 430 are formed on the first surface 101, the second surface 102, the third surface 103, the fourth surface 104, the fifth surface 105, and the sixth surface 106 of the body 100, but the scope of this disclosure is not limited thereto.

[0088] Second Implementation Example & Modification Example

[0089] Figure 10 This schematically illustrates a coil assembly according to a second embodiment of the present disclosure and is related to... Figure 2 The corresponding diagram. Figure 11 This schematically illustrates a coil assembly according to a second embodiment of the present disclosure and is related to... Figure 3 The corresponding diagram. Figure 12 yes Figure 10 An enlarged view of part B. Figure 13This is an illustrative example of a modification to the second embodiment of this disclosure and is related to... Figure 12 The corresponding diagram.

[0090] Reference Figures 1 to 5 as well as Figures 10 to 12 Compared to the coil assembly 1000 according to the first embodiment of this disclosure, the coil assembly 2000 according to this embodiment may further include a third insulating layer 530. Therefore, in describing this embodiment, only the third insulating layer 530, which differs from the first embodiment of this disclosure, will be described. For the remainder of the construction of this embodiment, the description of the first embodiment and the description of the modified examples of the first embodiment of this disclosure can be applied as is.

[0091] Reference Figures 10 to 12 According to this embodiment, the coil assembly 2000 may further include a third insulating layer 530 disposed between the coating CL of the wound coil 200 and the noise removal portion 300. Based on Figure 10 and Figure 11 In the direction of the third insulating layer 530, the third insulating layer 530 may be formed on the lower surface of the patterned portion 310 and the lower surface of the third lead-out portion 320, and may contact the coating CL on the upper surface of the coil portion 210.

[0092] The wound coil 200 can be manufactured by winding a metal wire including a coating CL, but the coating CL may be damaged due to pressure and heat during winding. In this case, leakage current may occur in the wound coil 200, thereby degrading the performance of the component. In this embodiment, by arranging a third insulating layer 530 between the coating CL forming the upper surface of the coil portion 210 and the lower surface of the noise removal portion 300, the electric field coupling between the conductor element of the coil portion 210 and the patterned portion 310 can be more stably ensured.

[0093] Reference Figure 12 The first insulating layer 510 and the third insulating layer 530 may be integrally formed so that there is no boundary between them, but the scope of this embodiment is not limited thereto. Figure 13 As shown in the modified example of this embodiment, a boundary can also be formed between the first insulating layer 510 and the third insulating layer 530. Figure 13 In the modified example of this embodiment shown, insulating material for forming the third insulating layer 530 can be stacked on the coating CL on the upper surface of the coil portion 210, the first conductive layer 311 and the second conductive layer 312 can be formed sequentially, and then the first insulating layer 510 can be formed. The insulating material can be appropriately selected by considering the capacitance that the coil portion 210 and the patterned portion 310 should form. For example, the insulating material can be Ajinomoto Build-up Film (ABF) or the like, but is not limited to this.

[0094] Third Embodiment & Modification Example

[0095] Figure 14 This is a schematic diagram illustrating a coil assembly according to a third embodiment of the present disclosure. Figure 15 This is an exploded view of the noise removal section and the wound coil of the coil assembly applied according to the third embodiment of the present disclosure. Figure 16 It shows along Figure 14 A diagram showing the cross section taken from line III-III'. Figure 17 It shows along Figure 14 A diagram showing the cross section taken by line IV-IV'. Figure 18 This is an illustrative example of a modification to the third embodiment of this disclosure and is related to... Figure 17 The corresponding diagram.

[0096] Reference Figures 1 to 5 and Figures 14 to 17 When comparing the coil assembly 3000 according to this embodiment with the coil assembly 1000 according to the first embodiment of this disclosure, the noise removal section 300, the noise removal section 300', and the third external electrode 430 may be provided differently. Therefore, in describing this embodiment, only the noise removal sections 300 and 300' and the third external electrode 430, which differ from those in the first embodiment of this disclosure, will be described. For the remaining parts of the construction of this embodiment, the description of the first embodiment and the description of the modified examples of the first embodiment of this disclosure can be applied as is.

[0097] Reference Figures 1 to 5 and Figures 14 to 17 In this embodiment, noise removal units 300 and 300' can be respectively disposed on the upper and lower surfaces of the coil portion 210. In this embodiment, by disposing noise removal units 300 and 300' on the upper and lower surfaces of the coil portion 210 respectively, the effect of removing high-frequency noise can be improved. The description of noise removal unit 300 in the first embodiment and its modified examples can be applied in the same way to the noise removal unit 300 disposed on the upper surface of the coil portion 210 and the noise removal unit 300' disposed on the lower surface of the coil portion 210.

[0098] The third lead-out portion 320 of the noise removal portion 300, which is disposed on the upper surface of the coil portion 210, is exposed from the third surface 103 of the main body 100, and the third lead-out portion 320' of the noise removal portion 300', which is disposed on the lower surface of the coil portion 210, is exposed from the fourth surface 104 of the main body 100. The third external electrode 430 can be disposed on the third surface 103, the sixth surface 106, and the fourth surface 104 of the main body 100 to contact the third leads-out portions 320 and 320', respectively. In a modified example, with... Figure 17As shown, the third lead-out portion 320 and the third lead-out portion 320' can be exposed together from either the third surface 103 or the fourth surface 104 of the body 100.

[0099] According to Figure 18 In the case of the modified example of the embodiment shown, a fourth external electrode 440 may also be included, which is disposed on the fourth surface 104 of the body 100 to contact and connect to the third lead-out portion 320'. During installation, each of the third external electrode 430 and the fourth external electrode 440 can be used as a grounding electrode.

[0100] Fourth Implementation Example & Modification Example

[0101] Figure 19 This is a schematic diagram illustrating a coil assembly according to a fourth embodiment of the present disclosure. Figure 20 It is shown schematically. Figure 19 A diagram of the molding section. Figure 21 It shows along Figure 19 A diagram showing the cross section taken by line V-V'. Figure 22 It shows along Figure 19 A diagram showing the cross section taken by line VI-VI'.

[0102] Reference Figures 1 to 5 as well as Figures 19 to 22 When comparing the coil assembly 4000 according to this embodiment with the coil assembly 1000 according to the first embodiment of this disclosure, the structure of the main body 100 may be configured differently. Therefore, in describing this embodiment, only the main body 100 that differs from the first embodiment of this disclosure will be described. For the rest of the construction of this embodiment, the description of the first embodiment of this disclosure and the description of the modified examples of the first embodiment can be applied as is.

[0103] Reference Figures 19 to 22 The main body 100 may include a molding portion 110 and a cover portion 120 disposed on one surface of the molding portion 110. The side surfaces of the molding portion 110 and the cover portion 120 may form a first surface 101, a second surface 102, a third surface 103, a fourth surface 104, and a fifth surface 105 of the main body 100, and another surface of the molding portion 110 (e.g., based on...) Figure 19 and Figure 20 The lower surface of the molding portion 110 in the direction of the molding portion 110 can form the sixth surface 106 of the body 100. In the following text, the other surface of the molding portion 110 and the sixth surface of the body 100 can be used with the same meaning.

[0104] The molding portion 110 may have one surface and another surface that are opposite to each other. The coil portion 210 of the wound coil 200 may be disposed between one surface of the molding portion 110 and the cover portion 120. The core C may be configured to protrude in the center of one surface of the molding portion 110 to penetrate the center of the coil portion 210 and the pattern portion 310.

[0105] The cover portion 120 can cover the wound coil 200 and the noise removal portion 300 together with the molding portion 110. The cover portion 120 can be formed by placing the wound coil 200 and the noise removal portion 300 in the molding portion 110 and pressing the material for forming the cover portion 120 thereon.

[0106] At least one of the molding portion 110, the cover portion 120 and the core C may include a magnetic material.

[0107] For example, the molding portion 110 can be formed by filling a mold for forming the molding portion 110 with magnetic material. As another example, the molding portion 110 can be formed by filling a mold with a composite material including magnetic material and insulating resin. A process of applying high temperature and high pressure to the magnetic material or composite material in the mold can be performed, but is not limited thereto. The molding portion 110 and the core C can be integrally formed using the aforementioned mold, such that no boundary is formed between them. The cover portion 120 can be formed by placing a magnetic composite sheet in which magnetic material is dispersed in insulating resin on the molding portion 110, the wound coil 200, and the noise removal portion 300, and then heating and pressurizing it.

[0108] The first lead 221 and the second lead 222 of the wound coil 200 may be exposed to be spaced apart from each other on another surface of the molding portion 110. The first lead 221 and the second lead 222 may have a shape that extends from the other surface of the molding portion 110 in the width direction Y of the body 100. The first lead 221 and the second lead 222 may be configured to be spaced apart from each other on the other surface 106 of the molding portion 110 along the length direction X of the body 100. A portion of the coating CL of the first lead 221 and the second lead 222 may be removed to facilitate the connection between the first lead 221 and the second lead 222 and the first external electrode 410 and the second external electrode 420.

[0109] The first lead-out portion 221 and the second lead-out portion 222 can be exposed from the sixth surface 106 of the body 100. For example, as Figures 19 to 21As shown, in the molding portion 110, recesses R and R' may be formed along the side surface and the other surface of the molding portion 110. A first lead-out portion 221 and a second lead-out portion 222 may be respectively provided in the recesses R and R'. Recesses R and R' may be formed to have shapes corresponding to the first lead-out portion 221 and the second lead-out portion 222. Recesses R and R' may be formed in a process of forming the molding portion 110 using a mold, or may be formed in the molding portion 110 in a process of pressing the cover portion 120. As another example, the first lead-out portion 221 and the second lead-out portion 222 may penetrate the molding portion 110 to be exposed from the other surface of the molding portion 110.

[0110] According to embodiments of this disclosure, high-frequency noise can be easily removed.

[0111] Although exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations may be made without departing from the scope of this disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: A wound coil includes a coil portion and a first lead and a second lead respectively connected to the coil portion; The main body, wherein the wound coil is disposed in the main body, and the first lead and the second lead of the wound coil are exposed from the main body; The noise removal section includes a patterned section and a third lead-out section. The patterned section is spaced apart from the metal wire of the wound coil in the body and has two ends spaced apart from each other to have an open loop. The third lead-out section is connected to the patterned section and exposed from the body. An insulating layer is disposed between the wound coil and the noise removal section; as well as A first external electrode, a second external electrode, and a third external electrode are arranged on the main body, spaced apart from each other, and respectively connected to the first lead-out portion, the second lead-out portion, and the third lead-out portion. The wound coil is formed by winding a metal wire whose surface is coated with a coating. The insulating layer includes the coating, and the coating is in contact with the noise removal section.

2. The coil assembly according to claim 1, wherein, In the conductive pattern provided in the main body, the pattern portion is connected only to the third lead-out portion.

3. The coil assembly according to claim 1, wherein, The main body has a core that penetrates the central portion of each of the coil portion and the pattern portion.

4. The coil assembly according to claim 3, wherein, The coil portion has at least one turn wound around the core. The area of ​​the patterned portion corresponds to the area of ​​the upper surface of the coil portion provided by the at least one turn.

5. The coil assembly according to claim 1, wherein, The noise removal section is configured to be spaced apart from the metal wire of the wound coil by the coating.

6. The coil assembly according to claim 5, wherein, The patterned portion includes a seed layer disposed on the coating on the upper surface of the coil portion and a plating layer disposed on the seed layer.

7. The coil assembly according to claim 1, wherein, The noise removal section is disposed on the upper or lower surface of the coil section.

8. The coil assembly according to claim 1, wherein, The patterned portion has a ring shape, and the two ends of the patterned portion are spaced apart from each other by a gap provided in the patterned portion.

9. The coil assembly according to claim 1, wherein, The main body includes a molded part and a cover part disposed on the molded part. The wound coil and the noise removal part are arranged between the molding part and the cover part.

10. The coil assembly according to claim 1, wherein, The main body has one surface and another surface opposite to each other, and two side surfaces that connect the one surface and the other surface and are opposite to each other. The two ends of the patterned portion are spaced apart from each other by a gap provided in the patterned portion. The third lead-out portion is exposed from one of the two side surfaces of the main body, and The distance from one end of the patterned portion to one of the two side surfaces of the body is equal to or greater than the distance from the other end of the patterned portion to the other of the two side surfaces of the body.

11. The coil assembly according to claim 1, wherein, The main body has one surface and another surface opposite to each other, two end surfaces connecting the one surface and the other surface and opposite to each other, and two side surfaces connecting the two end surfaces and opposite to each other. The first external electrode, the second external electrode, and the third external electrode are arranged on one surface of the body and spaced apart from each other.

12. The coil assembly according to claim 11, wherein, The third external electrode extends to one of the two side surfaces of the body and contacts and connects to the third lead-out of the noise removal section exposed from the one side surface of the body.

13. The coil assembly according to claim 12, wherein, The third external electrode extends to and is disposed on the other side of the two side surfaces of the body.

14. The coil assembly of claim 11, wherein, The noise removal components are respectively disposed on the upper and lower surfaces of the coil portion. The noise removal portion, which is respectively disposed on the upper surface and the lower surface of the coil portion, is connected to the third external electrode.

15. The coil assembly of claim 11, further comprising a fourth external electrode disposed on said one surface of the body and spaced apart from the first to the third external electrodes, respectively. The noise removal components are respectively disposed on the upper and lower surfaces of the coil portion. in, The noise removal portion disposed on the upper surface of the coil portion is connected to the third external electrode, and The noise removal portion disposed on the lower surface of the coil portion is connected to the fourth external electrode.

16. The coil assembly according to claim 1, wherein, The open loop of the noise removal unit includes one end that is fully disposed in the main body.

17. A coil assembly, comprising: A wound coil includes a coil portion and a first lead and a second lead respectively connected to the coil portion; The main body, wherein the wound coil is disposed in the main body, and the first lead and the second lead of the wound coil are exposed from the main body; The noise removal section includes a patterned section and a third lead-out section. The patterned section is spaced apart from the metal wire of the wound coil in the body and has two ends spaced apart from each other to have an open loop. The third lead-out section is connected to the patterned section and exposed from the body. An insulating layer is disposed between the wound coil and the noise removal section; as well as A first external electrode, a second external electrode, and a third external electrode are arranged on the main body, spaced apart from each other, and respectively connected to the first lead-out portion, the second lead-out portion, and the third lead-out portion. The wound coil is formed by winding a metal wire whose surface is coated with a coating. The insulating layer includes the coating, and the insulating layer further includes an additional insulating layer disposed between the coating and the noise removal portion.

18. The coil assembly of claim 17, wherein, The patterned portion includes a seed layer disposed on the additional insulating layer and a plating layer disposed on the seed layer.

19. The coil assembly of claim 17, wherein, The main body has one surface and another surface opposite to each other, and two side surfaces that connect the one surface and the other surface and are opposite to each other. The third lead-out portion is exposed from one of the two side surfaces of the body, and the patterned portion is spaced apart from the other side surface of the two side surfaces of the body.

20. The coil assembly of claim 17, wherein, The noise removal section is disposed on the upper and / or lower surface of the coil section.

21. The coil assembly of claim 17, wherein, The patterned portion has a ring shape, and the two ends of the patterned portion are spaced apart from each other by a gap provided in the patterned portion.

22. A coil assembly, comprising: A wound coil includes a coil portion and a first lead and a second lead respectively connected to the coil portion; The main body, wherein the wound coil is disposed in the main body, and the first lead and the second lead of the wound coil are exposed from the main body; The noise removal section includes a patterned section and a third lead-out section. The patterned section is spaced apart from the metal wire of the wound coil in the body and has two ends spaced apart from each other to have an open loop. The third lead-out section is connected to the patterned section and exposed from the body. An insulating layer is disposed between the wound coil and the noise removal section; as well as A first external electrode, a second external electrode, and a third external electrode are arranged on the main body, spaced apart from each other, and respectively connected to the first lead-out portion, the second lead-out portion, and the third lead-out portion. The main body has one surface and another surface opposite to each other, and two side surfaces that connect the one surface and the other surface and are opposite to each other. The two ends of the patterned portion are spaced apart from each other by a gap provided in the patterned portion. The third lead-out portion is exposed from one of the two side surfaces of the main body, and The distance from one end of the patterned portion to one of the two side surfaces of the body is equal to or greater than the distance from the other end of the patterned portion to the other of the two side surfaces of the body.

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