Coil assembly

Abstract

A coil assembly is provided, including a main body including first and second side surfaces opposite to each other in a first direction and third and fourth side surfaces opposite to each other in a second direction, the main body including a magnetic material, a coil disposed in the main body, the coil forming at least one turn, and a lead frame connected to both ends of the coil in the main body, the lead frame being disposed on the first and second side surfaces of the main body. When a shortest distance between the coil and the third side surface of the main body is denoted by M and a length of the main body in the second direction is denoted by W, M / W satisfies greater than or equal to 0 and less than or equal to 0.1. y y ​​

Description

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0172495, filed on November 27, 2024, 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 Technology

[0003] An inductor (a type of coil assembly) is a typical passive electronic component used in electronic devices, along with resistors and capacitors.

[0004] The market for high-current power inductors used in artificial intelligence (AI), automotive electronics, and robotics has recently grown rapidly. In particular, automotive components may require high-reliability technologies to enhance safety and may also need vibration resistance while meeting high-current characteristics.

[0005] Specifically, when the body is formed using magnetic metal particles, the coil can be embedded within the body. However, the size of the hollow coil may not be able to increase indefinitely, which could limit the design margin of the coil assembly. Summary of the Invention

[0006] One aspect of this disclosure is to improve the fill rate of the coil hollow by adjusting the design margin of the coil assembly.

[0007] According to one aspect of this disclosure, a coil assembly is provided, the coil assembly comprising: a body including a first side surface and a second side surface opposite to each other in a first direction, and a third side surface and a fourth side surface opposite to each other in a second direction, the body comprising a magnetic material; a coil disposed in the body, the coil forming at least one turn; and a lead frame connected to both ends of the coil in the body, the lead frame being disposed on the first side surface and the second side surface of the body. When the shortest distance between the coil and the third side surface of the body is M... y When M represents the length of the body in the second direction, and W represents the length of the body in the second direction, M y / W can satisfy a value greater than or equal to 0 and less than or equal to 0.1.

[0008] According to another aspect of this disclosure, a coil assembly is provided, the coil assembly comprising: a body including a first side surface and a second side surface opposite to each other in a first direction, and a third side surface and a fourth side surface opposite to each other in a second direction, the body comprising a magnetic material; a coil disposed in the body, the coil forming at least one turn; and a lead frame connected to both ends of the coil in the body, the lead frame being disposed on the first side surface and the second side surface of the body. When the shortest distance between the coil and the first side surface of the body is M... x When M represents the length of the body in the first direction, and L represents the length of the body in the first direction, M x / L can satisfy a value greater than or equal to 0 and less than or equal to 0.1.

[0009] According to an example embodiment of this disclosure, the coil assembly can improve the fill rate of the coil hollow by adjusting the design margin of the coil assembly. Attached Figure Description

[0010] The above and other aspects, features and advantages of this disclosure will become clearer from the following detailed embodiments, taken in conjunction with the accompanying drawings, in which: Figure 1 This is a perspective view of a coil assembly according to an exemplary embodiment of the present disclosure; Figure 2 It is along Figure 1 A cross-sectional view of the coil assembly taken from line I-I'; Figure 3 yes Figure 1 A diagram showing the main body (molded part and cover part); Figure 4 Is as Figure 3 A diagram showing the main body (molded part and cover part) of the variant; Figure 5 Is as Figure 3 A diagram of another variant of the main body (molded part and cover part); Figure 6 This is a perspective view of the coil assembly when viewed in the Z direction; Figure 7 yes Figure 6 Variations; Figure 8A When observed in the Y direction Figure 7 A diagram illustrating the coil assembly; Figure 8B Is as Figure 8A The variant when viewed in the Y direction Figure 7 A diagram illustrating the coil assembly; Figure 9 yes Figure 6 Another variant; and Figure 10 yes Figure 6 Another variation. Detailed Implementation

[0011] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit the exemplary embodiments. As used herein, the singular form is intended to include the meaning of the plural form as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more. It will be further understood that the terms "comprising" and / or "including" specify the presence of the stated features, quantities, operations, elements, components, or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, elements, components, and / or combinations thereof. Additionally, the terms "set on," "located on," etc., may mean that an element is located above or below a target portion, and do not necessarily mean that the element is located on the upper side of the target portion relative to the direction of gravity.

[0012] The terms “integrated into” and “connected to” can refer not only to elements that are in direct and physical contact with each other, but also to a structure in which another element is located between the elements such that the elements are also in contact with the other element.

[0013] For ease of description, the dimensions and thicknesses of each element shown in the accompanying drawings are arbitrarily represented, but this disclosure is not limited to the dimensions and thicknesses shown herein.

[0014] In the accompanying drawings, the X direction can be defined as a first direction or a length direction, the Y direction can be defined as a second direction or a width direction, and the Z direction can be defined as a third direction or a thickness direction.

[0015] In the following description, a coil assembly according to an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In the description with reference to the drawings, the same or corresponding elements are indicated by the same reference numerals, and repeated descriptions thereof will be omitted.

[0016] Various types of electronic components can be used in electronic devices, and various types of coil components can be appropriately used among such electronic components to remove noise.

[0017] In other words, in electronic devices, coil assemblies can be used as power inductors, high-frequency inductors, ordinary ferrite beads, high-frequency ferrite beads (such as ferrite beads suitable for the GHz band), common-mode filters, etc.

[0018] Figure 1 This is a perspective view of a coil assembly according to an exemplary embodiment of the present disclosure. Figure 2 It is along Figure 1 A cross-sectional view of the coil assembly taken from line I-I'.

[0019] Reference Figure 1 A coil assembly according to an exemplary embodiment of the present disclosure may include: a body 100 comprising a magnetic material; a coil 300 disposed in the body 100; and lead frames 400 and 500 disposed on a first side surface 101 and a second side surface 102 of the body.

[0020] The body 100 may form the overall appearance of the coil assembly 1000 according to this example embodiment, and may include a coil 300 embedded in the body 100.

[0021] The main body 100 may have an overall hexahedral shape. (Refer to...) Figure 1 The main body 100 may include a first side surface 101 and a second side surface 102 that are opposite to each other in a first direction (X direction), a third side surface 103 and a fourth side surface 104 that are opposite to each other in a second direction (Y direction), and a surface 105 and another surface 106 that are opposite to each other in a third direction (Z direction). Each of the first side surface 101, the second side surface 102, the third side surface 103 and the fourth side surface 104 of the main body 100 may correspond to a side surface of the main body 100 that connects one surface 105 and the other surface 106 of the main body 100 to each other.

[0022] Relative to optical microscope images or scanning electron microscope (SEM) images of cross-sections in the length direction X and thickness direction Z obtained by cutting the central portion of the coil assembly 1000 in the width direction Y, the length of the coil assembly 1000 can refer to: the maximum value among the lengths of multiple line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite each other in the length direction X, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the length direction X. Alternatively, the length of the coil assembly 1000 can refer to: the minimum value among the lengths of multiple line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite each other in the length direction X, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the length direction X. Alternatively, the length of the coil assembly 1000 can refer to: the arithmetic mean of the lengths of at least two line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite each other in the length direction X, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the length direction X.

[0023] Relative to optical microscope or SEM images of cross-sections in the length direction X and thickness direction Z obtained by cutting the central portion of the coil assembly 1000 in the width direction Y, the thickness of the coil assembly 1000 can refer to: the maximum value among the lengths of multiple line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite to each other in the thickness direction Z, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the thickness direction Z. Alternatively, the thickness of the coil assembly 1000 can refer to: the minimum value among the lengths of multiple line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite to each other in the thickness direction Z, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the thickness direction Z. Alternatively, the thickness of the coil assembly 1000 can refer to: the arithmetic mean of the lengths of at least two line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite to each other in the thickness direction Z, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the thickness direction Z.

[0024] Relative to optical microscope or SEM images of cross-sections in the length direction X and width direction Y obtained by cutting the central portion of the coil assembly 1000 in the thickness direction Z, the width of the coil assembly 1000 can refer to: the maximum value among the lengths of multiple line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite to each other in the width direction Y, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the width direction Y. Optionally, the width of the coil assembly 1000 can refer to: the minimum value among the lengths of multiple line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite to each other in the width direction Y, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the width direction Y. Optionally, the length of the coil assembly 1000 can refer to: the arithmetic mean of the lengths of at least two line segments connecting the two outermost boundary lines of the coil assembly 1000 that are opposite to each other in the width direction Y, as shown in the cross-sectional image, wherein the multiple line segments are parallel to the width direction Y.

[0025] The length, width, and thickness of the coil assembly 1000 can each be measured using a micrometer measurement method. According to the micrometer measurement method, each of the length, width, and thickness of the coil assembly 1000 can be measured by: setting the zero point using a micrometer with repeatability and reproducibility (R&R) gauges, inserting the coil assembly 1000 according to this example embodiment between the tips of the micrometer, and rotating the measuring rod of the micrometer. When measuring the length of the coil assembly 1000 using the micrometer measurement method, the length of the coil assembly 1000 can refer to a single measurement or the arithmetic mean of multiple measurements; this can be applied in the same way to the width and thickness of the coil assembly 1000.

[0026] The length, width, and thickness of the coil assembly 1000 may refer to the length, width, and thickness of the body 100, respectively. However, this disclosure is not limited thereto, and the length, width, and thickness of the coil assembly 1000 may refer to the overall length, width, and thickness including the body 100 and the insulating layer formed on the outer side of the body 100, or may refer to the overall length, width, and thickness including the body 100 and the lead frames 400 and 500 formed on the body 100, respectively.

[0027] The body 100 may include a magnetic material. The body 100 can be formed by filling a mold with a magnetic material, or by filling a mold with a composite material comprising a magnetic material and an insulating resin. A molding process involving applying high temperature and high pressure to the magnetic material or composite material in the mold may also be performed, but this disclosure is not limited thereto.

[0028] The magnetic material included in the main body 100 can be ferrite particles or magnetic metal particles.

[0029] The ferrite particles can be, for example, spinel-type ferrite particles (such as Mg-Zn-based ferrite particles, Mn-Zn-based ferrite particles, Mn-Mg-based ferrite particles, Cu-Zn-based ferrite particles, Mg-Mn-Sr-based ferrite particles, Ni-Zn-based ferrite particles, etc.), hexagonal ferrite particles (such as Ba-Zn-based ferrite particles, Ba-Mg-based ferrite particles, Ba-Ni-based ferrite particles, Ba-Co-based ferrite particles, Ba-Ni-Co-based ferrite particles, etc.), garnet-type ferrite particles (such as Y-based ferrite particles, etc.), and Li-based ferrite particles.

[0030] Magnetic metal 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, magnetic metal particles may be at least one of pure iron particles, Fe-Si based alloy particles, Fe-Si-Al based alloy particles, Fe-Ni based alloy particles, Fe-Ni-Mo based alloy particles, Fe-Ni-Mo-Cu based alloy particles, Fe-Co based alloy particles, Fe-Ni-Co based alloy particles, Fe-Cr based alloy particles, Fe-Cr-Si based alloy particles, Fe-Si-Cu-Nb based alloy particles, Fe-Ni-Cr based alloy particles, and Fe-Cr-Al based alloy particles.

[0031] The magnetic metal particles can be amorphous or crystalline. For example, the magnetic metal particles can be Fe-Si-B-Cr based amorphous alloy particles, but this disclosure is not limited thereto.

[0032] Each of the ferrite particles and the magnetic metal particles may have an average diameter of about 0.1 μm to about 30 μm, but this disclosure is not limited thereto.

[0033] The body 100 may include two or more types of magnetic materials. Here, different types of magnetic materials mean that the magnetic materials dispersed in the resin are distinguishable from each other in at least one aspect of average diameter, composition, crystallinity, and shape. For example, the body 100 may include two or more magnetic particles with different diameters.

[0034] The insulating resin may include, alone or in combination, epoxy resin, polyimide, liquid crystal polymer, etc., but this disclosure is not limited thereto.

[0035] Figure 3 This is a diagram illustrating the molded portion and the cover portion according to an exemplary embodiment of the present disclosure. (Refer to...) Figure 3 The main body 100 may include a molding part 110 and a cover part 120, with the coil disposed in the molding part 110 and the cover part 120 disposed on the molding part 110.

[0036] According to the present disclosure, the main body 100 of the coil assembly 1000 can change the shape of the molding part 110 and the cover part 120 to E-plate shape and I-plate shape respectively when forming the molding part 110 and the cover part 120, thereby effectively adjusting the allowance between the coil 300 and the side surface of the main body and improving the core filling rate.

[0037] The molding portion 110 may be disposed on the lower part of the cover portion 120, and the coil 300 is disposed in the molding portion 110. The molding portion 110 may have a surface (upper surface), another surface opposite to said one surface (lower surface), and a plurality of side surfaces connecting said one surface and said other surface to each other. The plurality of side surfaces of the molding portion 110 may be included in a portion of the plurality of side surfaces of the body 100.

[0038] The molding section 110 may include a core C passing through the coil 300. Here, "passing through the coil 300" may mean that the core passes through the hollow of the coil 300 forming at least one turn. The core C may be disposed in the internal region of the coil 300 forming at least one turn, and may have a circular cross-section or an elliptical cross-section.

[0039] An opening Ox exposing the coil 300 in the first direction (X direction) may be formed in the molding portion 110. Similarly, an opening Oy exposing the coil in the second direction (Y direction) may be formed in the molding portion 110. Openings Ox and Oy may be formed on the surfaces of the molding portion 110 that are included in the side surfaces 101, 102, 103, and 104 of the body 100. Therefore, when the body 100 is formed by pressing, the distance (allowance) between the coil 300 and the side surfaces 101, 102, 103, and 104 of the body 100 can be effectively adjusted.

[0040] A cover 120 may be disposed on the upper surface (one surface) of the molding portion 110 and may cover the coil 300. After the cover 120 is disposed on the molding portion 110 and the coil 300, the cover 120 may be pressed and bonded to the molding portion 110. The cover 120 may have one surface (lower surface) opposite to the molding portion 110, another surface (upper surface) opposite to said one surface, and a plurality of side surfaces connecting said one surface and said other surface. The plurality of side surfaces of the cover 120 may be included together with the plurality of side surfaces of the molding portion 110 in the plurality of side surfaces of the body 100.

[0041] Figure 4 Is as Figure 3 A diagram showing the modified main body (molded part and cover part).

[0042] Reference Figure 4 An opening Oy can be formed that exposes the coil in the second direction (Y direction), but an opening that exposes the coil in the first direction (X direction) is not formed.

[0043] Figure 5 Is as Figure 3 An illustration of another variant of the main body (molded part and cover part).

[0044] Reference Figure 5 The molding portion 110 may have an opening Ox that exposes the coil in a first direction (X direction) and no opening that exposes the coil in a second direction (Y direction).

[0045] As described above, openings Ox and / or Oy can be formed in the first direction (X direction) and / or the second direction (Y direction), thereby allowing for free design of the allowance of the coil 300 in the first direction and / or the second direction.

[0046] The coil 300 may be disposed in the body 100 to exhibit the characteristics of the coil assembly 1000. For example, when the coil assembly 1000 according to this example embodiment is used as a power inductor, the coil 300 may store an electric field as a magnetic field to maintain the output voltage, thereby stabilizing the power of the electronic device.

[0047] The coil 300 may include a winding portion 310 and leads 331 and 332, the winding portion 310 forming at least one turn around the core C, and the leads 331 and 332 being connected to the winding portion 310 and the lead frame, which will be described below.

[0048] Reference Figure 1 and Figure 2The winding portion 310 can form multiple turns from the core 110 toward the outside of the body 100. The winding portion 310 can be configured to be parallel to a surface 105 of the body (a surface of the body 100 in a first direction (X direction) and a second direction (Y direction)), and the winding axis of the winding portion 310 can be configured to be parallel to a third direction (Z direction).

[0049] The winding portion 310 can be wound into an overall circular or elliptical shape, and the core C can be located at the center of the winding portion 310.

[0050] The first lead-out portion 331 and the second lead-out portion 332 may correspond to the two ends of the coil 300, and may be connected to the lead frame 400 and 500 in the main body 100. That is, referring to... Figure 2 The first lead-out portion 331 can be connected to the first lead frame 400, and the second lead-out portion 332 can be connected to the second lead frame 500.

[0051] The coil 300 may be an air coil, formed from a metal wire (MW) with a circular cross-section, or formed as a flat coil, but this disclosure is not limited thereto.

[0052] The coil 300 can be formed by winding a conductive metal, and the portion of the coil 300, except for the portion that contacts the lead frames 400 and 500 described below, can be covered with an insulating coating. Specifically, the coil 300 can be formed by spirally winding a metal wire (MW) (such as copper wire (Cu)) comprising a metal wire and an insulating coating covering the surface of the metal wire.

[0053] Figure 6 This is a perspective view when observing the coil assembly in the Z direction.

[0054] Reference Figure 6 The allowance between the coil and the side surface of the body according to this example embodiment is described in detail.

[0055] According to this example embodiment, the coil assembly 1000 can adjust the shortest distance between the coil 300 and the third side surface 103 of the body 100, or the shortest distance between the coil 300 and the fourth side surface 104 of the body 100. Specifically, when the shortest distance between the coil 300 and the third side surface 103 of the body 100 is M... y When the length of the main body 100 in the second direction is represented by W, M y / W can satisfy a value greater than or equal to 0 and less than or equal to 0.1.

[0056] The shortest distance M between coil 300 and the third side surface 103 of body 100 can be measured using the following method. y .

[0057] A sample can be obtained using non-destructive testing (NDT) methods such as X-ray inspection by transmitting light through the XY plane (LW plane) of the coil assembly 1000. In the obtained sample, multiple line segments can be obtained connecting the outermost boundary line of the outermost turn of the winding portion 310 of the coil 300 in the second direction (Y direction) to the boundary line of the third side surface 103, respectively, and these multiple line segments are parallel to the second direction (Y direction). The shortest distance between the coil 300 and the third side surface 103 of the body 100 can refer to the minimum value of the lengths of the multiple line segments, or it can refer to the arithmetic mean of the lengths of two or more line segments. The leads 331 and 332 can be independent of the winding portion 310 forming the turns. Therefore, when measuring the aforementioned distances, the distance between the leads 331 and 332 and the third side surface of the body 100 can be disregarded.

[0058] However, this disclosure is not limited thereto, and the above can be examined by obtaining a cross section of the coil assembly in the XY plane (LW plane) using a process such as polishing according to a destructive physical analysis (DPA) method.

[0059] The shortest distance between coil 300 and the fourth side surface 104 of body 100 can be equal to M. y In other words, the allowance between the coil 300 and the third side surface 103 of the main body 100 and the allowance between the coil 300 and the fourth side surface 104 of the main body 100 can be the same.

[0060] Reference Figure 6 When the shortest distance between coil 300 and the first side surface 101 of body 100 is M x When the length of the main body 100 in the first direction is represented by L, M x / L can satisfy a value greater than or equal to 0 and less than or equal to 0.1.

[0061] The shortest distance between coil 300 and the second side surface 102 of body 100 can be equal to M. x In other words, the allowance between the coil 300 and the first side surface 101 of the main body 100 and the allowance between the coil 300 and the second side surface 102 of the main body 100 can be the same.

[0062] The description of the shortest distance between coil 300 and the third side surface 103 of body 100 can be similarly applied to the shortest distance between coil 300 and the first side surface 101 of body 100.

[0063] Table 1 below shows the margin (M) when adjusting the coil assembly based on Model 1 and Model 2. x and M yThe characteristics of the coil assembly (Ls (equivalent series inductance), Rdc (DC resistance), and Isat (saturation current)) were measured at the time. In Model 1, the body has a length of 6.0 mm, a width of 6.0 mm, and a thickness of 3.0 mm. In Model 2, the body has a length of 6.0 mm, a width of 6.0 mm, and a thickness of 4.0 mm.

[0064] [Table 1]

[0065] Referring to [Table 1], it can be confirmed that Ls has a maximum value when the margin is about 100 μm or 200 μm (specifically, 200 μm for Model 1 and 100 μm for Model 2), compared to the case with a margin of 600 μm. Furthermore, Isat continues to increase as the margin decreases.

[0066] In other words, when the allowance has a length value in the range of greater than or equal to 0 and less than or equal to 1 / 10 compared to the length and width of the main body, the size of the hollow core can be adequately ensured, and the characteristics of the coil assembly can be effectively improved.

[0067] Figure 7 yes Figure 6 A variant of .

[0068] Reference Figure 7 The winding portion 310 of the coil 300 can extend to the third side surface 103 and the fourth side surface 104 of the body 100. In this case, there may be no allowance between the coil 300 and the third side surface 103 and between the coil 300 and the fourth side surface 104, therefore M y / W can be 0.

[0069] Figure 8A When observed in the Y direction Figure 7 A diagram illustrating the coil assembly. Figure 8B Is as Figure 8A The variant when viewed in the Y direction Figure 7 A diagram illustrating the coil assembly.

[0070] Reference Figure 8A and Figure 8B The winding portion 310 can extend to the third side surface 103 and the fourth side surface 104 of the main body 100. For example... Figure 8A As shown, the portion of the winding portion 310 extending to the third side surface 103 and the fourth side surface 104 of the body 100 can be linear, such that the length of this extended portion of the winding portion 310 in the first direction (X direction) can be much smaller than the length of a single turn of the winding portion 310 in the second direction (Y direction). Alternatively, referring to... Figure 8BThe portion of the winding portion 310 extending to the third side surface 103 and the fourth side surface 104 of the body 100 may be rectangular in shape, such that the length of this extended portion of the winding portion 310 in the first direction (X direction) can be significantly increased, for example, approaching the length of a single turn of the winding portion 310 in the second direction (Y direction). Although not shown in the figures, an insulating film may be additionally formed on the portion of the winding portion 310 extending to the third side surface 103 and the fourth side surface 104 of the body 100, so that the winding portion 310 is not exposed to the surface of the coil assembly.

[0071] Figure 9 yes Figure 6 Another variation.

[0072] Reference Figure 9 The winding portion 310 of the coil 300 can extend to the first side surface 101 and the second side surface 102 of the body 100. In this case, there may be no allowance between the coil 300 and the first side surface 101 and between the coil 300 and the second side surface 102, therefore M x / W can be 0. Also, refer to... Figure 8A and Figure 8B The described shape can also be applied Figure 9 Examples of variations.

[0073] Figure 10 yes Figure 6 Another variation.

[0074] Reference Figure 10 The winding portion 310 of the coil 300 can extend to the third side surface 103 and the fourth side surface 104 of the body 100. In this case, there may be no allowance between the coil 300 and the third side surface 103 and between the coil 300 and the fourth side surface 104, therefore M y / W can be 0.

[0075] Meanwhile, the winding portion 310 of the coil 300 can extend to the first side surface 101 and the second side surface 102 of the main body 100. In this case, there may be no allowance between the coil 300 and the first side surface 101, and between the coil 300 and the second side surface 102, therefore M x / W) can be 0. Additionally, refer to... Figure 8A and Figure 8B The described shape can also be applied Figure 10 Examples of variations.

[0076] Lead frames 400 and 500 are connected to both ends of coil 300 in body 100 and may be disposed on side surfaces 101 and 102 of body 100 to serve as external electrodes of coil assembly according to this example embodiment.

[0077] Reference Figure 2 The lead frames 400 and 500 may include a first lead frame 400 disposed on a first side surface 101 of the body 100 and a second lead frame 500 disposed on a second side surface 102 of the body 100. The first lead frame 400 may be connected to a first lead-out portion 331 in the body 100, and the second lead frame 500 may be connected to a second lead-out portion 332 in the body 100.

[0078] The lead frames 400 and 500 can be disposed on the first side surface 101 and the second side surface 102 of the body 100, and can be bent toward one surface 105 of the body 100.

[0079] The lead frames 400 and 500 may include metals such as Ag, Ag-Pd, Ni or Cu, and Ni plating and Sn plating may be selectively formed on the surfaces of the lead frames 400 and 500.

[0080] While exemplary embodiments have been shown and described above, it will be readily understood by 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: The body includes a first side surface and a second side surface that are opposite to each other in a first direction, and a third side surface and a fourth side surface that are opposite to each other in a second direction, the body comprising a magnetic material; A coil is disposed in the body, the coil forming at least one turn; as well as A lead frame, connected to both ends of the coil in the body, the lead frame being disposed on the first side surface and the second side surface of the body. Wherein, when the shortest distance between the coil and the third side surface of the body is M y When M represents the length of the body in the second direction, and W represents the length of the body in the second direction, M y / W satisfies a condition that is greater than or equal to 0 and less than or equal to 0.

1.

2. The coil assembly according to claim 1, wherein, The shortest distance between the coil and the fourth side surface of the body is M. y .

3. The coil assembly according to claim 1, wherein, When the shortest distance between the coil and the first side surface of the body is M x When M represents the length of the body in the first direction, and L represents the length of the body in the first direction, M x / L satisfies a condition that is greater than or equal to 0 and less than or equal to 0.

1.

4. The coil assembly according to claim 3, wherein, The shortest distance between the coil and the second side surface of the body is M. x .

5. The coil assembly according to claim 1, wherein, The coil extends to the third and fourth side surfaces of the body.

6. The coil assembly according to claim 1, wherein, The coil extends to the first side surface and the second side surface of the body.

7. The coil assembly according to claim 1, wherein, The main body includes a molded part and a cover part, the coil is disposed in the molded part, and the cover part is disposed on the molded part. The molding section includes a core that passes through the coil.

8. The coil assembly according to claim 7, wherein, The molding portion has an opening that exposes the coil in the second direction.

9. The coil assembly according to claim 7 or 8, wherein, The molding portion has an opening that exposes the coil in the first direction.

10. The coil assembly according to claim 1, wherein, The body also includes a first surface and a second surface that are opposite to each other in a third direction, and The lead frame extends to the first surface of the body.

11. The coil assembly according to claim 8, wherein, The portion of the coil, except for the part that contacts the lead frame, is covered with an insulating coating.

12. The coil assembly according to claim 9, wherein, The portion of the coil, except for the part that contacts the lead frame, is covered with an insulating coating.

13. A coil assembly, comprising: The body includes a first side surface and a second side surface that are opposite to each other in a first direction, and a third side surface and a fourth side surface that are opposite to each other in a second direction, the body comprising a magnetic material; A coil is disposed in the body, the coil forming at least one turn; as well as A lead frame, connected to both ends of the coil in the body, the lead frame being disposed on the first side surface and the second side surface of the body. Wherein, when the shortest distance between the coil and the first side surface of the body is M x When M represents the length of the body in the first direction, and L represents the length of the body in the first direction, M x / L satisfies a condition that is greater than or equal to 0 and less than or equal to 0.

1.

14. The coil assembly of claim 13, wherein, The shortest distance between the coil and the second side surface of the body is M. x .

15. The coil assembly of claim 13, wherein, The coil extends to the first side surface and the second side surface of the body.

16. The coil assembly of claim 13, wherein, The main body includes a molded part and a cover part, the coil is disposed in the molded part, and the cover part is disposed on the molded part. The molding section includes a core that passes through the coil.

17. The coil assembly of claim 16, wherein, The molding portion has an opening that exposes the coil in the first direction and / or an opening that exposes the coil in the second direction.

18. The coil assembly of claim 13, wherein, The body also includes a first surface and a second surface that are opposite to each other in a third direction, and The lead frame extends to the first surface of the body.

19. The coil assembly of claim 17, wherein, The portion of the coil, except for the part that contacts the lead frame, is covered with an insulating coating.

20. The coil assembly of claim 19, wherein, The coil includes a metal winding portion, a portion of which extends to the first and second side surfaces and / or the third and fourth side surfaces of the body, wherein the coil assembly further includes an insulating film formed on the portion of the metal winding portion.

Images