Coil electronic component

Abstract

A coil electronic component according to one embodiment comprises a magnetic body including a magnetic material, a coil embedded in the magnetic body and including at least one turn of a conductive wire, a lead terminal connected to the coil, and a frame including a recess in which the lead terminal is received, and a conductive layer may be disposed between the lead terminal and the recess.

Description

Technology Field

[0001] The present disclosure relates to a coil electronic component. Background Technology

[0002] Recently, as the functions of mobile devices have become more diverse and power consumption has increased, low-loss and highly efficient coil electronic components are being adopted around power management integrated circuits (PMICs) to extend battery life within mobile devices.

[0003] Coil electronic components may include a coil embedded in a magnetic body and a frame connected to the coil that functions as an electrode; however, the connection between the coil and the frame may be damaged by external vibrations. Furthermore, if the frame is thick, the size of the magnetic body is relatively reduced, which may degrade the electromagnetic properties of the coil electronic component. Additionally, if the coil and the frame are connected by welding, the cross-sectional area of ​​the welded joint is smaller than the cross-sectional area of ​​the coil's conductor, which may increase the DC resistance (Rdc). The problem to be solved

[0004] One aspect of the embodiment aims to provide a coil electronic component that can maintain a strong connection between the coil and the frame, reduce DC resistance, and improve electromagnetic characteristics.

[0005] However, the problems that these embodiments aim to solve are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in these embodiments. means of solving the problem

[0006] A coil electronic component according to one embodiment comprises a magnetic body including a magnetic material, a coil embedded in the magnetic body and including at least one turn of a conductive wire, a lead terminal connected to the coil, and a frame including a recess in which the lead terminal is received, and a conductive layer may be disposed between the lead terminal and the recess.

[0007] The above-mentioned concave portion includes a bottom surface, a first inner surface, and a second inner surface, and the withdrawal terminal can contact the first inner surface and the second inner surface.

[0008] The conductive layer can be disposed between the withdrawal terminal and the bottom surface.

[0009] The above-mentioned concave portion further includes a third inner surface connecting the first inner surface and the second inner surface, and the withdrawal terminal can contact the third inner surface.

[0010] The above-mentioned concave portion includes a bottom surface, a first inner surface, and a second inner surface, and the conductive layer may be disposed between the withdrawal terminal and the bottom surface, between the withdrawal terminal and the first inner surface, and between the withdrawal terminal and the second inner surface, respectively.

[0011] The above-mentioned concave portion further includes a third inner surface connecting the first inner surface and the second inner surface, and the withdrawal terminal can contact the third inner surface.

[0012] The above frame may include a frame body and an extension protruding from the frame body.

[0013] The maximum width of the above-mentioned concave portion may be smaller than the width of the above-mentioned frame body.

[0014] The thickness of the above frame body may be smaller than the thickness of the above extension.

[0015] The maximum width of the above-mentioned concave portion may be the same as the width of the above-mentioned frame body.

[0016] The above frame body can be placed outside the magnetic body.

[0017] The above extension may include a first extension disposed outside the magnetic body and a second extension connected to the first extension and disposed inside the magnetic body.

[0018] The second extension may have a shape that is bent relative to the first extension.

[0019] The above frame body may include a first frame body including the concave portion and a second frame body connected to the first frame body.

[0020] The second frame body may have a shape that is bent relative to the first frame body.

[0021] The first frame body may be disposed on the end surface in the longitudinal direction of the magnetic body, and the second frame body may be disposed on the lower surface of the magnetic body.

[0022] The first frame body includes a first main surface close to the longitudinal cross-section of the magnetic body and a second main surface opposite to the first main surface, and the concave portion may be disposed on the side of the first main surface.

[0023] The first frame body includes a first main surface close to the longitudinal cross-section of the magnetic body and a second main surface opposite to the first main surface, and the concave portion may be disposed on the side of the second main surface.

[0024] The length of the above-mentioned withdrawal terminal may be 50% or more and 70% or less of the length of the above-mentioned frame.

[0025] The thickness of the above-mentioned withdrawal terminal may be smaller than the depth of the above-mentioned concave portion.

[0026] The above-mentioned withdrawal terminal may include copper (Cu).

[0027] The above frame may include copper (Cu), tin (Sn), or an alloy thereof.

[0028] The conductive layer may include silver (Ag), copper (Cu), annealed copper, gold (Au), aluminum (Al), calcium (Ca), tungsten (W), zinc (Zn), nickel (Ni), lithium (Li), iron (Fe), platinum (Pt), tin (Sn), or an alloy thereof.

[0029] The above conductive layer may include an intermetallic compound.

[0030] The conductive layer may include Cu6Sn5 and / or Cu3Sn.

[0031] The above conductive layer may include metal nanoparticles. Effects of the invention

[0032] According to an embodiment, a coil electronic component can be provided that can maintain a strong connection between the coil and the frame, reduce DC resistance, and improve electromagnetic characteristics. Brief explanation of the drawing

[0033] FIG. 1 is a perspective view schematically showing a coil electronic component according to one embodiment. Figure 2 is a schematic plan view of Figure 1. Figure 3 is a schematic side perspective view of Figure 1. Figure 4 is a schematic perspective view showing the frame of the coil electronic component of Figure 1. FIG. 5 is a schematic perspective view showing an example in which a conductive layer is placed in the frame of FIG. 4. FIG. 6 is a perspective view showing the connection structure between the coil and the frame of the coil electronic component of FIG. 1. Figure 7 is a schematic cross-sectional view showing the connection structure between the lead terminal of the coil electronic component of Figure 1 and the frame. Figure 8 is a schematic cross-sectional view taken along the line I-I' of Figure 6. FIG. 9 is a schematic exploded perspective view showing an example in which the coil and frame of the coil electronic component of FIG. 1 are placed in a magnetic body. FIG. 10 is a schematic perspective view showing the coil and frame of FIG. 9 placed in a magnetic body. FIG. 11 is a plan view schematically showing a coil electronic component according to a comparative example. Fig. 12 is a schematic side perspective view of Fig. 11. FIG. 13 is a perspective view schematically showing a coil electronic component according to another comparative example. Fig. 14 is a partial side perspective view of Fig. 13. FIG. 15 is a schematic cross-sectional view showing the connection structure between the lead terminal of a coil electronic component and the frame according to another embodiment. FIG. 16 is a schematic perspective view showing a modified example of the frame of FIG. 4. FIG. 17 is a schematic perspective view showing a state in which a conductive layer is placed in the frame of FIG. 16. FIG. 18 is a schematic perspective view showing the state in which a coil is connected to the frame of FIG. 16. FIG. 19 is a schematic perspective view showing another variation of the frame of FIG. 4. Fig. 20 is a side view of Fig. 19. FIG. 21 is a schematic perspective view showing the state in which a coil is connected to the frame of FIG. 19. FIG. 22 is a schematic cross-sectional view taken along the line II-II' of FIG. 21. FIG. 23 is a plan view schematically showing a coil electronic component according to another embodiment. Fig. 24 is a schematic side perspective view of Fig. 23. FIG. 25 is a schematic perspective view showing the frame of the coil electronic component of FIG. 23. Specific details for implementing the invention

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. In order to clearly explain the invention in the drawings, parts unrelated to the explanation have been omitted, and the same reference numerals have been used for identical or similar components throughout the specification. Furthermore, in the attached drawings, some components may be exaggerated, omitted, or schematically depicted, and the size of each component does not entirely reflect its actual size.

[0035] The attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the concept and technical scope of the present invention are included.

[0036] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0037] Furthermore, when it is said that a part, such as a layer, membrane, region, or plate, is "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when it is said that a part is "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" in the direction opposite to gravity.

[0038] Throughout the specification, terms such as “comprising” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Accordingly, when a part is said to “comprising” a certain component, unless specifically stated otherwise, this means that it may include additional components rather than excluding other components.

[0039] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.

[0040] Furthermore, throughout the specification, when the term "connected" is used, it does not mean only that two or more components are directly connected, but may also mean that two or more components are indirectly connected through other components, that they are connected not only physically but also electrically, or that they are a single unit although referred to by different names depending on their location or function.

[0041] FIG. 1 is a perspective view schematically showing a coil electronic component according to one embodiment, FIG. 2 is a schematic plan view of FIG. 1, and FIG. 3 is a schematic side perspective view of FIG. 1.

[0042] Referring to FIGS. 1, 2, and 3, a coil electronic component (1000) according to one embodiment includes a magnetic body (100), a coil (200), an extraction terminal (300), and a frame (400).

[0043] The magnetic body (100) may be formed in a roughly rectangular shape, but the present embodiment is not limited thereto. Due to shrinkage of magnetic powder, etc. during sintering, the magnetic body (100) may not have a perfect rectangular shape but may substantially have a rectangular shape. For example, the magnetic body (100) may have a roughly rectangular shape, but the corners or vertices may have a rounded shape.

[0044] In this embodiment, for convenience of explanation, two faces of the magnetic body (100) facing in the length direction (L-axis direction) are defined as the first face (S1) and the second face (S2), respectively; two faces of the magnetic body (100) facing in the width direction (W-axis direction) are defined as the third face (S3) and the fourth face (S4), respectively; and two faces of the magnetic body (100) facing in the thickness direction (T-axis direction) are defined as the fifth face (S5) and the sixth face (S6), respectively.

[0045] The length of the coil electronic component (1000) may mean the maximum value among the lengths of multiple line segments parallel to the length direction (L-axis direction) by connecting each of the two outermost boundary lines facing in the length direction (L-axis direction) of the coil electronic component (1000) shown in the aforementioned cross-sectional photograph, based on an optical microscope or SEM (Scanning Electron Microscope) photograph of the cross section in the length direction (L-axis direction) at the center of the coil electronic component (1000) in the width direction (W-axis direction). Alternatively, the length of the coil electronic component (1000) may mean the minimum value among the lengths of multiple line segments parallel to the length direction (L-axis direction) by connecting each of the two outermost boundary lines facing in the length direction (L-axis direction) of the coil electronic component (1000) shown in the aforementioned cross-sectional photograph. Alternatively, the length of the coil electronic component (1000) may mean the arithmetic mean of the lengths of at least two of the multiple line segments parallel to the length direction (L-axis direction) by connecting the two outermost boundary lines facing each other in the length direction (L-axis direction) of the coil electronic component (1000) shown in the cross-sectional photograph above.

[0046] The thickness of the coil electronic component (1000) may be the maximum value among the lengths of multiple line segments parallel to the thickness direction (T-axis direction) by connecting each of the two outermost boundary lines facing in the thickness direction (T-axis direction) of the coil electronic component (1000) shown in the aforementioned cross-section photograph, based on an optical microscope or SEM (Scanning Electron Microscope) photograph of the cross section in the length direction (L-axis direction) and thickness direction (T-axis direction) at the center of the width direction (W-axis direction) of the coil electronic component (1000). Alternatively, the thickness of the coil electronic component (1000) may be the minimum value among the lengths of multiple line segments parallel to the thickness direction (T-axis direction) by connecting each of the two outermost boundary lines facing in the thickness direction (T-axis direction) of the coil electronic component (1000) shown in the aforementioned cross-section photograph. Alternatively, the thickness of the coil electronic component (1000) may mean the arithmetic mean of the lengths of at least two of the multiple line segments parallel to the thickness direction (T-axis direction) by connecting the two outermost boundary lines facing each other in the thickness direction (T-axis direction) of the coil electronic component (1000) shown in the cross-sectional photograph above.

[0047] The width of the coil electronic component (1000) may be the maximum value among the lengths of multiple line segments parallel to the width direction (W-axis direction) by connecting each of the two outermost boundary lines facing in the width direction (W-axis direction) of the coil electronic component (1000) shown in the aforementioned cross-section photograph, based on an optical microscope or SEM (Scanning Electron Microscope) photograph of the cross section in the length direction (L-axis direction) and width direction (W-axis direction) at the center of the coil electronic component (1000) in the thickness direction (T-axis direction). Alternatively, the width of the coil electronic component (1000) may be the minimum value among the lengths of multiple line segments parallel to the width direction (W-axis direction) by connecting each of the two outermost boundary lines facing in the width direction (W-axis direction) of the coil electronic component (1000) shown in the aforementioned cross-section photograph. Alternatively, the width of the coil electronic component (1000) may mean the arithmetic mean of the lengths of at least two of the multiple line segments parallel to the width direction (W-axis direction) by connecting the two outermost boundary lines facing each other in the width direction (W-axis direction) of the coil electronic component (1000) shown in the cross-sectional photograph above.

[0048] Meanwhile, the length, width, and thickness of the coil electronic component (1000) may each be measured using a micrometer measurement method. The micrometer measurement method can be performed by setting the zero point with a micrometer that has Gage R&R (Repeatability and Reproducibility), inserting the coil electronic component (1000) according to the present embodiment between the tips of the micrometer, and rotating the measuring lever of the micrometer. Meanwhile, when measuring the length of the coil electronic component (1000) using the micrometer measurement method, the length of the coil electronic component (1000) may refer to a value measured once, or it may refer to the arithmetic mean of values ​​measured multiple times. This can be applied equally to the measurement of the width and thickness of the coil electronic component (1000).

[0049] The magnetic body (100) forms the exterior of the coil electronic component (1000) and is a space in which a magnetic path is formed, which is a path through which the magnetic flux induced in the coil (200) passes when current is applied to the coil (200) through the frame (400).

[0050] The magnetic body (100) encapsulates the coil (200) and contains a magnetic material. The magnetic body (100) contains magnetic particles, and an insulating material may be interposed between the magnetic particles.

[0051] The magnetic material may include a first metal magnetic particle, a second metal magnetic particle having a smaller particle size than the first metal magnetic particle, and a third metal magnetic particle having a smaller particle size than the second metal magnetic particle. The average particle size (D) of the first metal magnetic particle. 50 ) may be 5㎛ or more and 30㎛ or less, and the average particle size (D) of the second metallic magnetic particle 50 ) may be 1㎛ or more and 5㎛ or less, and the average particle size (D) of the third metal magnetic particle 50 ) may be 0.05㎛ or more and 0.5㎛ or less.

[0052] The magnetic particles can be ferrite particles or metallic magnetic particles that exhibit magnetic properties.

[0053] The ferrite particles may be at least one of spinel-type ferrites such as Mg-Zn, Mn-Zn, Mn-Mg, Cu-Zn, Mg-Mn-Sr, and Ni-Zn systems, hexagonal ferrites such as Ba-Zn, Ba-Mg, Ba-Ni, Ba-Co, and Ba-Ni-Co systems, garnet-type ferrites such as Y-type ferrites, and Li-type ferrites.

[0054] The metallic magnetic particles may be composed of two or more particles with different compositions and 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 particles may be at least one of pure iron, Fe-Si alloy, Fe-Si-Al alloy, Fe-Ni alloy, Fe-Ni-Mo alloy, Fe-Ni-Mo-Cu alloy, Fe-Co alloy, Fe-Ni-Co alloy, Fe-Cr alloy, Fe-Cr-Si alloy, Fe-Si-Cu-Nb alloy, Fe-Ni-Cr alloy, and Fe-Cr-Al alloy. Here, having different compositions of the metallic magnetic particles may mean having different content.

[0055] The metallic magnetic particles may be amorphous or crystalline. For example, the metallic magnetic particles may be an Fe-Si-B-Cr-based amorphous alloy, but the present embodiment is not limited thereto. The metallic magnetic particles may have an average particle size of about 0.1 μm to 30 μm, but are not limited thereto. In this specification, the average particle size is D 90 or D 50 It can refer to a particle size distribution expressed as such. Particle size distribution is well known to ordinary skilled technicians as an indicator representing the proportion of particles of a certain size (particle diameter) included within the particle group being measured. D 50 (Particle size corresponding to 50% of the volume cumulative of the particle size distribution) refers to the average particle size.

[0056] The metal magnetic particles may be two or more different types of metal magnetic particles. Here, the different types of metal magnetic particles mean that the metal magnetic particles are distinguished from each other in at least one of average particle size, composition, component ratio, crystallinity, and shape.

[0057] The insulating material may include epoxy, polyimide, liquid crystal polymer, etc., either alone or in combination, but is not limited thereto.

[0058] The method of forming the magnetic body (100) is not particularly limited. For example, the magnetic body (100) can be formed by placing a sheet made of magnetic material on the upper and lower parts of the coil (200) and then compressing and curing it.

[0059] The coil (200) is placed inside the magnetic body (100) and exhibits the characteristics of the coil electronic component (1000). For example, when the coil electronic component (1000) of the present embodiment is utilized as a power inductor, when current is applied to the coil (200), it can store energy in the form of a magnetic field and maintain an output voltage, thereby serving to stabilize the power supply of an electronic device.

[0060] The coil (200) may include at least one turn of a conductive wire. For example, the coil (200) may have a spirally wound shape of a metal wire (e.g., copper (Cu) or silver (Ag)) whose surface is covered with an insulating material. The coil (200) is not limited to a single wire and may be made of a stranded wire or two or more wires.

[0061] When viewed in the thickness direction (T-axis direction), the coil (200) may be circular, but is not limited thereto. For example, when viewed in the thickness direction (T-axis direction), the coil (200) may have various known shapes, such as a rectangle.

[0062] The cross-section intersecting the extension direction of the individual conductive wire of the coil (200) can have various known shapes such as square, circular, or elliptical.

[0063] The withdrawal terminal (300) connects the coil (200) and the frame (400).

[0064] The withdrawal terminal (300) may have a plate shape. For example, the longitudinal (L-axis direction) and thickness (T-axis direction) cross-section of the withdrawal terminal (300) may have an approximately rectangular shape. However, the present embodiment is not limited thereto.

[0065] The withdrawal terminal (300) may be made of the same or different material as the coil (200). For example, the withdrawal terminal (300) may include copper (Cu), but the present embodiment is not limited thereto.

[0066] For example, the withdrawal terminal (300) can be formed by rolling the end of the coil (200). In this case, the withdrawal terminal (300) is made of the same material as the coil (200).

[0067] As another example, the withdrawal terminal (300) may be manufactured separately from the coil (200) and joined to the coil (200). In this case, the withdrawal terminal (300) may be made of the same or different material as the coil (200).

[0068] The withdrawal terminal (300) includes a first withdrawal terminal (310) and a second withdrawal terminal (320).

[0069] The first withdrawal terminal (310) connects the first end (201) of the coil (200) with the first frame (410, described later). The second withdrawal terminal (320) connects the second end (203) of the coil (200) with the second frame (420, described later).

[0070] The frame (400) includes a first frame (410) and a second frame (420). The frame (400) may include copper (Cu), tin (Sn), or an alloy thereof, but the present embodiment is not limited thereto.

[0071] The first frame (410) is connected to the first withdrawal terminal (310), and the second frame (420) is connected to the second withdrawal terminal (320).

[0072] Hereinafter, with reference to FIGS. 4, 5, 6, 7, and 8, the structure of the frame and the connection structure between the frame and the extraction terminal will be explained in detail.

[0073] FIG. 4 is a schematic perspective view showing the frame of the coil electronic component of FIG. 1, and FIG. 5 is a schematic perspective view showing an example in which a conductive layer is disposed on the frame of FIG. 4. FIG. 6 is a perspective view showing the connection structure between the coil and the frame of the coil electronic component of FIG. 1, and FIG. 7 is a schematic cross-sectional view showing the connection structure between the lead terminal of the coil electronic component of FIG. 1 and the frame. FIG. 8 is a schematic cross-sectional view taken along the line I-I' of FIG. 6. For convenience of explanation, the aforementioned drawings show the frame in an unbent state.

[0074] Referring to FIG. 4, the first frame (410) generally has a plate shape and may include a first frame body (411), a first extension (413), and a first concave portion (415). Likewise, the second frame (420) generally has a plate shape and may include a second frame body (421), a second extension (423), and a second concave portion (425). Since the second frame (420) corresponds to the first frame (410) except for its position, the following description will focus on the first frame (410).

[0075] The first frame (410) may include a first main surface (FS1) and a second main surface (FS2) facing each other in the thickness direction (T-axis direction). The first concave portion (415) may have a shape formed by a portion of the second main surface (FS2) of the first frame (410) being sunken. One end of the first concave portion (415) in the length direction (L-axis direction) is open and the other end is closed.

[0076] The first frame body (411) forms the overall appearance of the first frame (410), and the first extension (413) is a part protruding from the first frame body (411).

[0077] The first extension (413) may include a third extension (413L) and a fourth extension (413R) that protrude from the first frame body (411), respectively. The third extension (413L) and the fourth extension (413R) may face each other in the width direction (W-axis direction).

[0078] The first frame (410) may have a first width (w1) and a second width (w2). The first width (w1) may be the width of the part without the first extension (413), i.e., the first frame body (411). The second width (w2) may be the width of the part with the first extension (413). For example, the minimum width of the first frame (410) may be the first width (w1) and the maximum width may be the second width (w2). Meanwhile, depending on the shape of the first extension (413), there may be a region where the width of the first frame (410) changes from the first width (w1) to the second width (w2). However, the present embodiment is not limited thereto.

[0079] The width (w3) of the first concave portion (415) may be smaller than the first width (w1) of the first frame (410). For example, the maximum width of the first concave portion (415) may be smaller than the width of the first frame body (411).

[0080] In another embodiment, the first frame (410) may not include the first extension (413). In this case, the first frame (410) viewed in the thickness direction (T-axis direction) may be approximately rectangular in shape.

[0081] Referring to FIG. 5, a first conductive layer (510) is disposed within a first concave portion (415), and a second conductive layer (520) is disposed within a second concave portion (425). For example, the first conductive layer (510) and the second conductive layer (520) can be formed by applying silver (Ag) nano paste to the first concave portion (415) and the second concave portion (425). However, the present embodiment is not limited thereto.

[0082] Subsequently, as shown in FIG. 6, the first withdrawal terminal (310) can be received within the first recess (415), thereby allowing the first withdrawal terminal (310) and the first frame (410) to be connected to each other. For example, when the first withdrawal terminal (310) is placed within the first recess (415), the first withdrawal terminal (310) comes into contact with silver (Ag) nano paste. Accordingly, the first withdrawal terminal (310) and the first frame (410) are connected through the first conductive layer (510). Subsequently, when a curing process is performed in a temperature range of 150°C or higher and 200°C or lower, the silver (Ag) nanoparticles are sintered. Accordingly, the first withdrawal terminal (310) and the first frame (410) are joined to each other. Similarly, the second withdrawal terminal (320) and the second frame (420) can be joined to each other.

[0083] Here, the length (L1) of the first withdrawal terminal (310) may be 50% or more and 70% or less of the length (L2) of the first frame (410). If the first withdrawal terminal (310) is less than 50% of the length of the first frame (410), the bonding strength between the first withdrawal terminal (310) and the first frame (410) is insufficient, so it may be vulnerable to external vibrations.

[0084] Referring to FIGS. 7 and 8, the first concave portion (415) may include a bottom surface (417), a first inner surface (418a), a second inner surface (418b), and a third inner surface (418c), and a first conductive layer (510) may be disposed between the first concave portion (415) and the first extraction terminal (310).

[0085] The first conductive layer (510) may be positioned between the first withdrawal terminal (310) and the bottom surface (417). In this case, the first withdrawal terminal (310) may directly contact the first inner surface (418a), the second inner surface (418b), and the third inner surface (418c) of the first concave portion (415), respectively, but may not directly contact the bottom surface (417).

[0086] In another embodiment, the first conductive layer (510) may be disposed between the third inner surface (418c) of the first concave portion (415) and the first withdrawal terminal (310). In this case, the first withdrawal terminal (310) may not come into direct contact with the third inner surface (418c).

[0087] The first conductive layer (510) may include silver (Ag), copper (Cu), annealed copper, gold (Au), aluminum (Al), calcium (Ca), tungsten (W), zinc (Zn), nickel (Ni), lithium (Li), iron (Fe), platinum (Pt), tin (Sn), or an alloy thereof. However, the present embodiment is not limited thereto.

[0088] The first conductive layer (510) may include an intermetallic compound. For example, the first conductive layer (510) may include Cu6Sn5 and / or Cu3Sn.

[0089] Meanwhile, the first conductive layer (510) may include metal nanoparticles. The type of metal nanoparticles is not particularly limited and may include nanoparticles of gold (Au), silver (Ag), copper (Cu), platinum (Pt), ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), etc.

[0090] Here, the thickness (t1) of the first withdrawal terminal (310) may be smaller than the depth (d1) of the first recess (415). In this case, the first withdrawal terminal (310) does not protrude further than the second main surface (FS2) of the first frame (410) in the thickness direction (T-axis direction).

[0091] Below, a method for manufacturing a coil electronic component will be briefly described with reference to FIGS. 9 and FIGS. 10.

[0092] FIG. 9 is a schematic exploded perspective view showing an example in which the coil and frame of the coil electronic component of FIG. 1 are placed in a magnetic body, and FIG. 10 is a schematic perspective view showing the state in which the coil and frame of FIG. 9 are placed in a magnetic body.

[0093] Referring to FIG. 9, a coil (200) connected to the first frame (410) and the second frame (420) can be placed between the lower magnetic sheet (M1) and the upper magnetic sheet (M2), and the lower magnetic sheet (M1) and the upper magnetic sheet (M2) can be compressed. For example, after placing the coil (200) in the internal space (C1) of the lower magnetic sheet (M1), pressure can be applied to the lower magnetic sheet (M1) and the upper magnetic sheet (M2), and a curing process can be performed.

[0094] Accordingly, as illustrated in FIG. 10, a magnetic body (100) with a coil (200) embedded therein can be formed. A portion of the first frame (410) and a portion of the second frame (420) are exposed to the outside of the magnetic body (100). Here, the exposed portion of the first frame (410) is folded twice so that the portion contacts the first surface (S1) and the sixth surface (S6) of the magnetic body (100). Likewise, the exposed portion of the second frame (420) is folded twice so that the portion contacts the second surface (S2) and the sixth surface (S6) of the magnetic body (100). Accordingly, a coil electronic component, such as that illustrated in FIG. 1, can be manufactured. For example, the first main surface (FS1) of the first frame (410) may come into contact with the first surface (S1) and the sixth surface (S6) of the magnetic body (100), and the second main surface (FS2) may not come into contact with the magnetic body (100).

[0095] Referring again to FIGS. 1, FIGS. 2, and FIGS. 3, the first frame body (411) can be placed outside the magnetic body (100).

[0096] Referring to FIG. 3, the first frame body (411) may include a third frame body (411a) and a fourth frame body (411b). The third frame body (411a) is a portion disposed on the first surface (S1) of the magnetic body (100), and the fourth frame body (411b) is a portion disposed on the sixth surface (S6) of the magnetic body (100). The fourth frame body (411b) may have a shape that is bent relative to the third frame body (411a). For example, the third frame body (411a) may contact the first surface (S1) of the magnetic body (100), and the fourth frame body (411b) may contact the sixth surface (S6) of the magnetic body (100). However, the present embodiment is not limited thereto.

[0097] The first withdrawal terminal (310) can be received in the first recess (415, see FIG. 4) of the first frame body (411). For example, the first recess (415, see FIG. 4) can be formed in the third frame body (411a). Referring to FIG. 2 and FIG. 3, the outer surface (310S) of the first withdrawal terminal (310) may not protrude in the longitudinal direction (L-axis direction) from the outer surface (411S) of the third frame body (411a). That is, the outer surface (310S) of the first withdrawal terminal (310) and the outer surface (411S) of the third frame body (411a) may form the same plane.

[0098] The first extension (413) may include a third extension (413L) and a fourth extension (413R) that protrude from the first frame body (411), respectively.

[0099] Referring to FIG. 2, the third extension (413L) may include an outer portion (414a) and an inner portion (414b). The outer portion (414a) is a portion disposed outside the magnetic body (100), and the inner portion (414b) is a portion disposed inside the magnetic body (100). The outer portion (414a) may have a shape that is bent relative to the inner portion (414b). For example, the outer portion (414a) may be parallel to the first surface (S1) of the magnetic body (100), and the inner portion (414b) may be parallel to the fifth surface (S5) of the magnetic body (100). However, the present embodiment is not limited thereto.

[0100] The fourth extension (413R) faces the third extension (413L) in the width direction (W-axis direction). The fourth extension (413R) may include an outer portion (414c) and an inner portion (414b). Since the fourth extension (413R) corresponds to the third extension (413L) except for its location, a repeated description regarding it will be omitted.

[0101] The second frame body (421) can be placed outside the magnetic body (100).

[0102] Referring to FIG. 3, the second frame body (421) may include a fifth frame body (421a) and a sixth frame body (421b). The fifth frame body (421a) is a portion disposed on the first surface (S1) of the magnetic body (100), and the sixth frame body (421b) is a portion disposed on the sixth surface (S6) of the magnetic body (100). The sixth frame body (421b) may have a shape that is bent relative to the fifth frame body (421a). For example, the fifth frame body (421a) may contact the first surface (S1) of the magnetic body (100), and the sixth frame body (421b) may contact the sixth surface (S6) of the magnetic body (100). However, the present embodiment is not limited thereto.

[0103] The second withdrawal terminal (320) can be received in the second recess (425, see FIG. 4) of the second frame body (421). For example, referring to FIG. 2 and FIG. 3, the outer surface (320S) of the second withdrawal terminal (320) may not protrude in the longitudinal direction (L-axis direction) from the outer surface (421S) of the fifth frame body (421a). That is, the outer surface (320S) of the second withdrawal terminal (320) and the outer surface (421S) of the fifth frame body (421a) may form the same surface.

[0104] The second extension (423) may include a fifth extension (423L) and a sixth extension (423R) that protrude from the second frame body (421), respectively.

[0105] Referring to FIG. 2, the fifth extension (423L) may include an outer portion (424a) and an inner portion (424b). The outer portion (424a) is a portion disposed outside the magnetic body (100), and the inner portion (424b) is a portion disposed inside the magnetic body (100). The outer portion (424a) may have a shape that is bent relative to the inner portion (424b). For example, the outer portion (424a) may be parallel to the second surface (S2) of the magnetic body (100), and the inner portion (424b) may be parallel to the fifth surface (S5) of the magnetic body (100). However, the present embodiment is not limited thereto.

[0106] The sixth extension (423R) faces the fifth extension (423L) in the width direction (W-axis direction). The sixth extension (423R) may include an outer portion (424c) and an inner portion (424b). Since the sixth extension (423R) corresponds to the third extension (413L) except for its location, a repeated description thereof will be omitted.

[0107] FIG. 11 is a plan view schematically showing a coil electronic component according to a comparative example, and FIG. 12 is a schematic side perspective view of FIG. 11.

[0108] Referring to FIGS. 11 and 12, the first lead terminal (310') of the coil electronic component (1000') is positioned to protrude in the longitudinal direction (L-axis direction) from the first frame body (411'). Since the size of the magnetic body (100') can be relatively reduced by the amount of the first lead terminal (310') protruding, the electromagnetic properties of the coil electronic component (1000') can be reduced.

[0109] On the other hand, according to the present embodiment, since the first withdrawal terminal (310) does not protrude in the longitudinal direction (L-axis direction) from the first frame body (411), the size of the magnetic body (100) can be relatively larger, and accordingly, the electromagnetic characteristics of the coil electronic component (1000) can be improved.

[0110] FIG. 13 is a schematic perspective view showing a coil electronic component according to another comparative example, and FIG. 14 is a partial side perspective view of FIG. 13.

[0111] Referring to FIGS. 13 and 14, the first lead terminal (310) of the coil electronic component (1000) is joined to the first frame (410) by welding. That is, the first lead terminal (310) and the first frame (410) are spot welded, and a point joint (P) is formed between the first lead terminal (310) and the first frame (410).

[0112] The point junction (P) serves as a via connecting the first lead terminal (310) and the first frame (410). Since the point junction (P) has a smaller cross-sectional area than the conductor of the coil (200), current may not flow smoothly through the point junction (P) compared to when it flows through the conductor of the coil. As a result, the DC resistance (Rdc) may increase. The DC resistance (Rdc) may also increase when the cross-sectional area of ​​the first lead terminal (310) is smaller than the cross-sectional area of ​​the conductor of the coil (200). Additionally, since the size of the point junction (P) is smaller than the size of the part where the first lead terminal (310) and the first frame (410) face each other, stress may be concentrated on the point junction (P) and it may break if continuous vibration is transmitted from the outside.

[0113] On the other hand, according to the present embodiment, since the first outgoing terminal (310) is received in the first recess (415) of the first frame (410), the first outgoing terminal (310) and the first frame (410) are surface-bonded by the first conductive layer (510). In this case, since current flows through the entire contact surface between the first outgoing terminal (310) and the first frame (410), the DC resistance (Rdc) can be reduced even if the cross-sectional area of ​​the first outgoing terminal (310) is smaller than the cross-sectional area of ​​the conductor of the coil (200). Furthermore, since surface bonding is stronger than point bonding, there is a low possibility of damage caused by vibrations transmitted from the outside.

[0114] FIG. 15 is a schematic cross-sectional view showing the connection structure between the lead terminal of a coil electronic component and the frame according to another embodiment.

[0115] Referring to FIG. 15, the first conductive layer (510') may be in direct contact with at least three surfaces of the first concave portion (415) of the first frame (410). The first conductive layer (510') may be disposed between the first outgoing terminal (310) and the bottom surface (417), between the first outgoing terminal (310) and the first inner surface (418a), and between the first outgoing terminal (310) and the second inner surface (418b), respectively.

[0116] Except for the above, the remaining components are identical to the components of the coil electronic component shown in Fig. 1, so a repetitive description thereof will be omitted.

[0117] FIG. 16 is a schematic perspective view showing a modified example of the frame of FIG. 4, FIG. 17 is a schematic perspective view showing a state in which a conductive layer is placed on the frame of FIG. 16, and FIG. 18 is a schematic perspective view showing a state in which a coil is connected to the frame of FIG. 16.

[0118] Referring to FIG. 16, the frame (1400) includes a first frame (1410) and a second frame (1420).

[0119] The first frame (1410) may include a first frame body (1411), a first extension (1413), and a first concave portion (1415). The second frame (1420) may include a second frame body (1421), a second extension (1423), and a second concave portion (1425). Since the second frame (1420) corresponds to the first frame (1410) except for its position, only the first frame (1410) will be described below, and the description of the second frame (1420) will be omitted.

[0120] The first concave portion (1415) may have a shape formed by a portion of the surface in the thickness direction (T-axis direction) of the first frame body (1411) being sunken. Both ends of the first concave portion (1415) in the length direction (L-axis direction) are open.

[0121] Referring to FIG. 17, a first conductive layer (1510) is disposed in the first concave portion (1415). For example, the first conductive layer (1510) can be formed by applying silver (Ag) nano paste to the first concave portion (1415). However, the present embodiment is not limited thereto.

[0122] Since both ends of the first concave portion (1415) in the longitudinal direction (L-axis direction) are open, when the first frame (1410) and the first frame (410) shown in FIG. 4 are the same size, the first concave portion (1415) may be larger than the first concave portion (415) of FIG. 4. Therefore, the first conductive layer (1510) formed in the first concave portion (1415) may be larger than the first conductive layer (510) of FIG. 5, and the bonding strength may also be stronger.

[0123] Subsequently, as shown in FIG. 18, the first withdrawal terminal (310) can be received within the first recess (1415) so that the first withdrawal terminal (310) and the first frame (1410) can be connected to each other. Likewise, the second withdrawal terminal (320) can be received within the second recess (1425) so that the second withdrawal terminal (320) and the second frame (1420) can be connected to each other.

[0124] Here, since both ends in the longitudinal direction (L-axis direction) of the first concave portion (1415) are open, a portion of the first conductive layer (1510) may be exposed without contacting the first withdrawal terminal (310). A portion of the second conductive layer (1520) may also be exposed without contacting the second withdrawal terminal (320). However, the present embodiment is not limited thereto.

[0125] Except for the above, the remaining components are identical to or correspond to the frame of FIG. 4, so a repetitive description thereof will be omitted.

[0126] FIG. 19 is a schematic perspective view showing another variation of the frame of FIG. 4, FIG. 20 is a side view of FIG. 19, FIG. 21 is a schematic perspective view showing a state in which a coil is connected to the frame of FIG. 19, and FIG. 22 is a schematic cross-sectional view taken along the line II-II' of FIG. 21.

[0127] Referring to FIG. 19, the first frame (2410) may include a first frame body (2411), a first extension (2413), and a first concave portion (2415). Since the second frame (2420) corresponds to the first frame (2410) except for its position, the following description will focus on the first frame (2410).

[0128] The first extension (2413) may include a third extension (2413L) and a fourth extension (2413R) that protrude from the first frame body (2411), respectively.

[0129] The first concave portion (2415) may have a shape formed by the surface of the first frame body (2411) in the thickness direction (T-axis direction) being recessed. The portion of the first concave portion (2415) excluding the portion that contacts the first extension portion (2413) is open. That is, one end of the first concave portion (2415) in the length direction (L-axis direction) is open, and a portion of the other end is open. A portion of one end and a portion of the other end in the width direction (W-axis direction) of the first concave portion (2415) are each open.

[0130] In the area between the third extension (2413L) and the fourth extension (2413R), the first concave portion (2415) may have a shape in which its width decreases, and in the remaining area, the first concave portion (2415) may have a width of a constant size. For example, the maximum width (w4) of the first concave portion (2415) may be the same as the width (w5) of the frame body (2411). However, the present embodiment is not limited thereto.

[0131] Referring to FIG. 20, the thickness (t2) of the first frame body (2411) in the area where the first concave portion (2415) is formed may be smaller than the thickness (t3) of the first extension portion (2413).

[0132] Referring to FIG. 21, the first withdrawal terminal (310) can be connected to the first frame (2410) by being seated in the first concave portion (2415). In the same way, the second withdrawal terminal (310) and the second frame (2420) can be connected to each other.

[0133] For example, referring to FIG. 22, a clad metal structure in which the first lead terminal (310) and the first frame (2410) are joined together can be formed by placing the first lead terminal (310) in the first concave portion (2415) and then rolling it. In particular, when the first lead terminal (310) and the first frame (2410) contain different types of metals, an intermetallic compound layer (2510) can be formed at the interface between the first lead terminal (310) and the first concave portion (2415). The intermetallic compound layer thus formed can function as a conductive layer.

[0134] FIG. 23 is a plan view schematically showing a coil electronic component according to another embodiment, FIG. 24 is a schematic side perspective view of FIG. 23, and FIG. 25 is a schematic perspective view showing a frame of the coil electronic component of FIG. 23.

[0135] Referring to FIGS. 23 and 24, the first extraction terminal (1310) of the coil electronic component (2000) may be positioned between the first frame body (1411) and the magnetic body (1100). For example, the first extraction terminal (1310) may be in contact with the first surface (S1) of the magnetic body (1100), and the first frame body (1411) may be in contact with the first extraction terminal (1310) and also in contact with the first surface (S1) of the magnetic body (1100). In this case, the first extraction terminal (1310) may be received in the first recess (1415) of the first frame body (1411). For example, referring to FIG. 25, the first frame (1410) may include a first surface (FS1') and a second surface (FS2'). The first concave portion (1415) may have a shape formed by a portion of the first surface (FS1') of the first frame body (410) being recessed. The first extraction terminal (1310) may be accommodated in the first concave portion (1415). For example, the structure of the first frame (1410), excluding the location of the first concave portion (1415), may be identical to the structure of the first frame (410) of FIG. 4. Therefore, referring to FIG. 24 and FIG. 25 together, the first surface (FS1') of the first frame (1410) may come into contact with the first surface (S1) and the sixth surface (S6) of the magnetic body (1100), and the second surface (FS2') may not come into contact with the magnetic body (1100).

[0137] Except for the above, the remaining components are identical to or correspond to the components of the coil electronic component shown in FIG. 1, so a repetitive description thereof will be omitted.

[0139] Although embodiments of the present invention have been described above, the present invention is not limited thereto and can be implemented with various modifications within the scope of the claims, the description of the invention, and the attached drawings, and it is obvious that such modifications also fall within the scope of the present invention. Explanation of the symbols

[0140] 1000: Coil electronic components 100: Magnetic body 200: Coil 300: Withdrawal terminal 310: First withdrawal terminal 320: Second withdrawal terminal 400: Frame 410: 1st Frame 411: First frame body 413: 1st Extension 415: First depression 420: Frame 2 421: Second Frame Body 423: Second Expansion 425: Second depression 510: 1st Challenge Floor

Claims

Claim 1 A coil electronic component comprising a magnetic body including a magnetic material, a coil embedded in the magnetic body and including at least one turn of a conductive wire, a lead terminal connected to the coil, and a frame including a recess receiving the lead terminal, wherein a conductive layer is disposed between the lead terminal and the recess. Claim 2 In claim 1, the above-mentioned concave portion comprises a bottom surface, a first inner surface, and a second inner surface, and the above-mentioned withdrawal terminal contacts the first inner surface and the second inner surface, a coil electronic component. Claim 3 In paragraph 2, the conductive layer is disposed between the lead terminal and the bottom surface, forming a coil electronic component. Claim 4 In paragraph 2, the above-mentioned concave portion further comprises a third inner portion connecting the first inner portion and the second inner portion, and the extraction terminal contacts the third inner portion, a coil electronic component. Claim 5 A coil electronic component according to claim 1, wherein the concave portion comprises a bottom surface, a first inner surface, and a second inner surface, and the conductive layer is disposed between the lead terminal and the bottom surface, between the lead terminal and the first inner surface, and between the lead terminal and the second inner surface, respectively. Claim 6 In paragraph 5, the above-mentioned concave portion further comprises a third inner portion connecting the first inner portion and the second inner portion, and the extraction terminal contacts the third inner portion, a coil electronic component. Claim 7 In claim 1, the above-mentioned frame comprises a frame body and an extension protruding from the frame body, a coil electronic component. Claim 8 In claim 7, the maximum width of the concave portion is smaller than the width of the frame body, in a coil electronic component. Claim 9 In claim 7, the thickness of the frame body is smaller than the thickness of the extension, a coil electronic component. Claim 10 In paragraph 7, the maximum width of the concave portion is the same as the width of the frame body, a coil electronic component. Claim 11 In paragraph 7, the above-mentioned frame body is a coil electronic component disposed outside the above-mentioned magnetic body. Claim 12 In claim 11, the extension comprises a first extension disposed outside the magnetic body and a second extension connected to the first extension and disposed inside the magnetic body, a coil electronic component. Claim 13 In paragraph 12, the second extension portion has a bent shape relative to the first extension portion, a coil electronic component. Claim 14 In claim 11, the above-mentioned frame body comprises a first frame body including the above-mentioned concave portion and a second frame body connected to the first frame body, forming a coil electronic component. Claim 15 In claim 14, the second frame body is a coil electronic component having a shape bent relative to the first frame body. Claim 16 In claim 14, the coil electronic component, wherein the first frame body is disposed on the longitudinal end surface of the magnetic body and the second frame body is disposed on the lower surface of the magnetic body. Claim 17 In claim 14, the first frame body comprises a first main surface near the longitudinal cross-section of the magnetic body and a second main surface opposite to the first main surface, and the concave portion is disposed on the side of the first main surface, a coil electronic component. Claim 18 In claim 14, the first frame body comprises a first main surface near the longitudinal cross-section of the magnetic body and a second main surface opposite to the first main surface, and the concave portion is disposed on the side of the second main surface, a coil electronic component. Claim 19 A coil electronic component according to claim 1, wherein the length of the lead terminal is 50% or more and 70% or less of the length of the frame. Claim 20 In claim 1, a coil electronic component in which the thickness of the lead terminal is smaller than the depth of the concave portion. Claim 21 In claim 1, the lead terminal is a coil electronic component comprising copper (Cu). Claim 22 In claim 1, the frame is a coil electronic component comprising copper (Cu), tin (Sn), or an alloy thereof. Claim 23 A coil electronic component according to claim 1, wherein the conductive layer comprises silver (Ag), copper (Cu), annealed copper, gold (Au), aluminum (Al), calcium (Ca), tungsten (W), zinc (Zn), nickel (Ni), lithium (Li), iron (Fe), platinum (Pt), tin (Sn), or an alloy thereof. Claim 24 In claim 1, the conductive layer comprises an intermetallic compound, forming a coil electronic component. Claim 25 In paragraph 24, the above conductive layer comprises Cu6Sn5 and / or Cu3Sn, a coil electronic component. Claim 26 In claim 1, the conductive layer comprises metal nanoparticles, a coil electronic component.

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