Coil components

Abstract

This invention provides a coil component with enhanced vibration resistance during circuit board mounting due to improved bonding force between the main body and the external electrodes. [Solution] A coil component 1000 according to one aspect of the present invention includes a main body 100 including a first and second surface facing a first direction L, and a third and fourth surface facing a second direction W perpendicular to the first direction, a coil 200 disposed within the main body, and external electrodes 300, 400 disposed within the main body and connected to the coil, wherein the external electrodes include base portions 320, 420 disposed on the first or second surface, insertion portions 310, 410 bent from the base portion and at least a part of which is disposed within the main body, and extension portions 331, 332, 433, 434 bent from the base portion and extending to the third and fourth surfaces, respectively.

Description

[Technical Field]

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

[0002] An inductor, a type of coil component, is a typical passive electronic component used in electronic devices along with resistors and capacitors. It regulates the flow of current through a coil, removes noise, and protects electronic devices by preventing sudden changes in current.

[0003] As electronic devices become increasingly high-performance and smaller, the number of inductors used in these devices is also increasing, and the size of the inductors themselves is also tending to decrease.

[0004] On the other hand, as the number of electronic devices used in vehicles increases, and especially as the number of electronic devices directly mounted in the engine compartment increases, there is a demand for inductors with enhanced vibration resistance and improved heat dissipation. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2018-022793 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] One of the objectives of the embodiment of the present invention is to provide a coil component in which the coupling force between the main body and the external electrode is strengthened, thereby improving vibration resistance when mounted on a circuit board.

[0007] Another objective of the embodiment of the present invention is to provide a coil component in which heat dissipation is improved by increasing the exposed area of ​​the external electrodes. [Means for solving the problem]

[0008] According to one aspect of the present invention, a coil component can be provided that includes a main body comprising a first surface and a second surface facing a first direction, a third surface and a fourth surface facing a second direction perpendicular to the first direction, a coil disposed within the main body, and an external electrode disposed within the main body and connected to the coil, wherein the external electrode comprises a base portion disposed on the first surface or the second surface, an insertion portion bent from the base portion and at least a portion of which is disposed within the main body, and extension portions bent from the base portion and extending to the third surface and the fourth surface, respectively.

[0009] According to another aspect of the present invention, a coil component can be provided which includes a body having first and second surfaces facing in a first direction, third and fourth surfaces facing in a second direction, and fifth and sixth surfaces facing in a third direction; a coil disposed within the body; and a first external electrode and a second external electrode disposed within the body and connected to the coil, facing in a first direction, wherein each of the first and second external electrodes includes an insertion portion, at least a portion of which is disposed within the body; extension portions extending to both sides along the second direction and each being bent in the first direction; and a pad portion extending to the fifth surface, wherein each end of the extension portion faces in a second direction, and the insertion portion and the pad portion are arranged to face in a third direction. [Effects of the Invention]

[0010] In one embodiment of the present invention, the coil component has an extended portion of the external electrode, which strengthens the coupling force between the main body and the external electrode, thereby improving vibration resistance when mounted on a circuit board.

[0011] The coil component according to one embodiment of the present invention can improve heat dissipation by increasing the exposed area of ​​the external electrodes. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic perspective view showing a coil component according to the first embodiment of the present invention. [Figure 2] It is a perspective view showing the internal structure of FIG. 1. [Figure 3] It is a view showing a cross section along the line I-I' of FIG. 1. [Figure 4] It is a side view of FIG. 1 seen from the first direction. [Figure 5] It is a side view of FIG. 1 seen from the second direction. [Figure 6] It is a view showing the state before bending the external electrode. [Figure 7] It is a graph showing the standard value of the equivalent stress due to the change in the minimum distance T1 between the uppermost end extension line of the insertion part and the uppermost end of the extension part. [Figure 8] It is a perspective view schematically showing the coil component according to the second embodiment of the present invention. [Figure 9] It is a perspective view schematically showing the coil component according to a modification of the second embodiment of the present invention. [Figure 10] It is a perspective view schematically showing the coil component according to the third embodiment of the present invention. [Figure 11] It is a perspective view schematically showing the coil component according to the fourth embodiment of the present invention. [Figure 12] It is a view showing the form in which the coil component of FIG. 1 is mounted on a circuit board via a pad portion. [Figure 13] It is a view showing the form in which the coil component of FIG. 1 is mounted on a circuit board via an extension portion. [Figure 14] It is a perspective view schematically showing the coil component according to the fifth embodiment of the present invention. [Figure 15] It is a perspective view schematically showing the coil component according to the sixth embodiment of the present invention. [Figure 16] It is a perspective view schematically showing the coil component according to the seventh embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0013] The terminology used in this application is used solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “includes” or “having” are intended to specify the existence of features, figures, stages, actions, components, parts, or combinations thereof described in the specification, and should be understood not to preemptively exclude the possibility of the existence or addition of one or more other features, figures, stages, actions, components, parts, or combinations thereof. Throughout the specification, “above” means located above or below the part in question, and does not necessarily mean located above the direction of gravity.

[0014] Furthermore, the term "connection" shall not refer only to cases where each component is in direct physical contact with another component, but shall also encompass cases where other components are interposed between the components, and each component is in contact with the other components.

[0015] The dimensions and thicknesses of each component shown in the drawings are arbitrary for illustrative purposes, and the present invention is not necessarily limited to those shown.

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

[0017] Hereinafter, coil components according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing these components with reference to the accompanying drawings, the same drawing number will be assigned to identical or corresponding components, and redundant explanations will be omitted.

[0018] Electronic devices utilize various types of electronic components, and various types of coil components can be appropriately used between these electronic components for purposes such as noise reduction.

[0019] In other words, coil components in electronic devices can be used in power inductors, high-frequency inductors (HF inductors), general beads, high-frequency beads (GHz beads), common-mode filters, and so on.

[0020] First Embodiment Figure 1 is a schematic perspective view of a coil component 1000 according to the first embodiment of the present invention; Figure 2 is a perspective view showing the internal structure of Figure 1; Figure 3 is a cross-sectional view along the line I-I' in Figure 1; Figure 4 is a side view of Figure 1 viewed from the first direction (L direction); and Figure 5 is a side view of Figure 1 viewed from the second direction (W direction).

[0021] Referring to Figures 1 to 5, the coil component 1000 according to the first embodiment of the present invention may include a main body 100, a coil 200, and external electrodes 300 and 400. The external electrodes 300 and 400 may also include insertion portions 310 and 410, base portions 320 and 420, extension portions 330 and 340, and may further include pad portions 340 and 440.

[0022] The coil component 1000 according to this embodiment includes extensions 330 and 340 to which the external electrodes 300 and 400 extend on both sides along the second direction (W direction). At least a portion of the extensions 330 and 430 are bent in the first direction (L direction) and extended to the third surface 103 and the fourth surface 104, thereby reducing the stress acting during mounting on the circuit board and thereby reinforcing the vibration resistance of the coil component 1000 against vibrations in the second direction (W direction).

[0023] On the other hand, the stress reduction effect is observed along the maximum length T of the third direction (T direction) of the external electrodes 300 and 400. E In contrast, the ratio T1 / T is the minimum distance T1 between the uppermost extension line of the insertion parts 310 and 410 and the uppermost part of the extension parts 330 and 430. E This can vary depending on the circumstances, and this will be discussed later with reference to Figure 4.

[0024] The main components constituting the coil component 1000 according to this embodiment will be described in detail below.

[0025] The main body 100 has the external appearance of the coil component 1000 according to this embodiment, and a coil 200 can be embedded inside it.

[0026] The main body 100 can be formed into a hexahedral shape overall.

[0027] The main body 100 may include a first surface 101 and a second surface 102 facing in the first direction (L direction), a third surface 103 and a fourth surface 104 facing in the second direction (W direction), and a fifth surface 105 and a sixth surface 106 facing in the third direction (T direction). Each of the first surface 101, second surface 102, third surface 103, and fourth surface 104 of the main body 100 can correspond to a wall surface of the main body 100 connecting the fifth surface 105 and the sixth surface 106 of the main body 100.

[0028] The main body 100 can be formed, for example, such that the coil component 1000 according to this embodiment, including external electrodes 300, 400, has a length of 4.0 mm, a width of 4.0 mm, and a thickness of 2.0 mm, or a length of 4.0 mm, a width of 4.0 mm, and a thickness of 1.5 mm, or a length of 4.0 mm, a width of 4.0 mm, and a thickness of 1.2 mm, or a length of 3.2 mm, a width of 2.5 mm, and a thickness of 1.2 mm, or a length of 2.5 mm, a width of 2.0 mm, and a thickness of 1.2 mm, or a length of 2.0 mm, a width of 1.6 mm, and a thickness of 1.2 mm. However, it is not limited to these. On the other hand, the above-mentioned exemplary values ​​for the length, width, and thickness of the coil component 1000 refer to values ​​that do not reflect process errors, so values ​​within the range that can be recognized as process errors should be considered to correspond to the above-mentioned exemplary values.

[0029] The length of the coil component 1000 described above can mean the maximum value among the dimensions of multiple line segments that are spaced apart in the thickness direction T, connected parallel to the length direction L, using an optical microscope image or SEM (Scanning Electron Microscope) image of a cross-section taken in the length direction L-thickness direction T at the center of the width direction W of the coil component 1000 as a reference. Alternatively, the length of the coil component 1000 can mean the minimum value among the dimensions of multiple line segments described above. Alternatively, the length of the coil component 1000 can mean the arithmetic mean of at least three or more of the dimensions of multiple line segments described above. Here, the multiple line segments parallel to the length direction L may be equally spaced in the thickness direction T, but the scope of the present invention is not limited thereto.

[0030] The thickness of the coil component 1000 described above can mean the maximum value among the numerical values ​​(dimensions) of multiple line segments that are spaced apart in the length direction L, connected parallel to the thickness direction T by two outermost boundary lines of the coil component 1000 facing the thickness direction T as shown in the optical microscope image or SEM (Scanning Electron Microscope) image of the cross-section (length direction L - thickness direction T) taken at the center of the width direction W of the coil component 1000. Alternatively, the thickness of the coil component 1000 can mean the minimum value among the numerical values ​​(dimensions) of the multiple line segments described above. Alternatively, the thickness of the coil component 1000 can mean the arithmetic mean of at least three or more numerical values ​​(dimensions) of the multiple line segments described above. Here, the multiple line segments parallel to the thickness direction T may be equally spaced in the length direction L, but the scope of the present invention is not limited thereto.

[0031] The width of the coil component 1000 described above can mean the maximum value among the numerical values ​​(dimensions) of multiple line segments that are spaced apart in the length direction L, connected parallel to the width direction W, based on an optical microscope image or SEM (Scanning Electron Microscope) image of a cross-section (length direction L - width direction W) taken at the center of the coil component 1000 in the thickness direction T. Alternatively, the width of the coil component 1000 can mean the minimum value among the numerical values ​​(dimensions) of the multiple line segments described above. Alternatively, the width of the coil component 1000 can mean the arithmetic mean of at least three or more numerical values ​​(dimensions) of the multiple line segments described above. Here, the multiple line segments parallel to the width direction W may be equally spaced in the length direction L, but the scope of the present invention is not limited thereto.

[0032] Alternatively, the length, width, and thickness of the coil component 1000 may be measured by micrometer measurement. Micrometer measurement involves setting a zero point with a Gage R&R (Repeatability and Reproducibility) micrometer, inserting the coil component 1000 according to this embodiment between the tips of the micrometer, and rotating the micrometer's measuring lever to perform the measurement. On the other hand, when measuring the length of the coil component 1000 using micrometer measurement, the length may represent a single measurement or the arithmetic mean of multiple measurements. This can be similarly applied to the width and thickness of the coil component 1000.

[0033] The main body 100 may include a magnetic material and a resin. The main body 100 can be formed by filling a mold with a magnetic material, or by filling a mold with a composite material containing a magnetic material and a resin. A molding process in which high temperature and high pressure are applied to the magnetic material or composite material in the mold may be carried out further, but is not limited thereto.

[0034] The main body 100 can, for example, be formed by separating two regions, upper and lower, around a coil 200, and then joining them together to form a single main body 100. In this case, the two regions of the main body 100 may have different densities depending on the formation temperature and pressure, and may also have some differences in the components they contain, but this is not limited to this.

[0035] The magnetic material contained in the main body 100 may, for example, be ferrite or metallic magnetic powder.

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

[0037] The metallic magnetic powder may contain one or more elements selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metallic magnetic powder may be at least one of the following: pure iron powder, Fe-Si alloy powder, Fe-Si-Al alloy powder, Fe-Ni alloy powder, Fe-Ni-Mo alloy powder, Fe-Ni-Mo-Cu alloy powder, Fe-Co alloy powder, Fe-Ni-Co alloy powder, Fe-Cr alloy powder, Fe-Cr-Si alloy powder, Fe-Si-Cu-Nb alloy powder, Fe-Ni-Cr alloy powder, or Fe-Cr-Al alloy powder.

[0038] The metallic magnetic powder may be amorphous or crystalline. For example, the metallic magnetic powder may be an Fe-Si-B-Cr amorphous alloy powder, but is not necessarily limited to this.

[0039] The ferrite and metallic magnetic powders may each have an average diameter of approximately 0.1 μm to 30 μm, but are not limited to this.

[0040] The main body 100 may contain two or more types of magnetic materials dispersed in the resin. Here, different types of magnetic materials mean that the magnetic materials dispersed in the resin are distinguishable from each other by any one of the following: average diameter, composition, crystallinity, and shape.

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

[0042] Referring to Figures 2 and 3, the body 100 may include a core 110. The core 110 can mean a region of the body 100 that is filled so as to penetrate the air core of the coil 200. The core 110 may be located in the inner region of the coil 200 that forms at least one turn, and the cross-section of the core 110 may be circular or elliptical on a cross-section perpendicular to the winding axis of the coil 200, but is not limited thereto, and if the coil 200 has a square shape, the cross-section of the core 100 may also have a square shape.

[0043] Referring to Figure 3, recesses R1 and R2 can be formed in at least one of the regions between the first surface 101 and the fifth surface 105 of the main body 100, and between the second surface 102 and the fifth surface 105. In one embodiment, the first recess R1 formed on the first surface 101 can be extended to the fifth surface 105, and the second recess R2 formed on the second surface 102 can be extended to the fifth surface 105.

[0044] In this embodiment, recesses R1 and R2 correspond to areas on the inside of the main body 100 where steps are formed to accommodate the lead-out sections 210 and 220 and the external electrodes 300 and 400. By arranging the lead-out sections 210 and 220 of the coil 200, the insertion sections 310 and 410 of the external electrodes 300 and 400, the base sections 320 and 420, and the pad sections 340 and 440 in recesses R1 and R2, the size of the coil component 1000 can be reduced.

[0045] On the other hand, for the sake of explanation, the regions in which recesses R1 and R2 are formed are also defined as being included in the first surface 101, the second surface 102, and the fifth surface 105 of the main body 100.

[0046] The insertion portion 310, base portion 320, and pad portion 340 of the first external electrode 300 are arranged in the first recess R1, and the insertion portion 410, base portion 420, and pad portion 440 of the second external electrode 400 are arranged in the second recess R2. However, it is not limited thereto, and in one embodiment, the lead-out portions 210, 220 and the external electrodes 300, 400 may be arranged in a form that protrudes from the flat surface of the main body 100 without recesses R1, R2.

[0047] The coil 200 is located inside the main body 100 and is configured to exhibit the characteristics of the coil component 1000. For example, when the coil component 1000 of this embodiment is used as a power inductor, the coil 200 can stabilize the power supply of electronic equipment by storing the electric field in a magnetic field and maintaining the output voltage.

[0048] Referring to Figures 2 and 3, the coil 200 can form at least one turn around the core 110 and include lead-out sections 210 and 220 at both ends of the outermost turn. Specifically, the coil 200 can include a first lead-out section 210 that extends to the first surface 101 of the body 100, and a second lead-out section 220 that extends to the second surface 102 of the body 100.

[0049] The first lead-out portion 210 may be positioned between the main body 100 and the first external electrode 300, and the second lead-out portion 220 may be positioned between the main body 100 and the second external electrode 400. The first lead-out portion 210 may extend along the surface of a first recess R1 formed on the first surface 101 of the main body 100, and the second lead-out portion 220 may extend along the surface of a second recess R2 formed on the second surface 102 of the main body 100. However, it is not limited thereto, and each of the first lead-out portion 210 and the second lead-out portion 220 may extend along the surfaces of the first recess R1 and the second recess R2 formed spaced apart on the fifth surface 105.

[0050] Referring to Figures 2 and 3, the drawout portions 210 and 220 can be formed by rolling both ends of the coil 200, and the rolling process can give them a flat shape. That is, the thickness of the drawout portions 210 and 220 may be formed to be thinner than the diameter of the coil 200, and the width of the surface where the drawout portions 210 and 220 contact the external electrodes 300 and 400 may be formed to be wider than the diameter of the coil 200.

[0051] In one embodiment, when a surface bonding structure is provided between the lead-out portions 210, 220 and the external electrodes 300, 400 as described above, the contact area is increased, improving the coupling reliability between the lead-out portions 210, 220 and the external electrodes 300, 400, and also improving the Rdc characteristics.

[0052] The coil 200 in this embodiment corresponds to an air-core coil and may be a wound coil, but is not limited to this. The coil 200 may be coated with an insulating material in the remaining area, excluding the lead-out portions 210 and 220 that connect to the external electrodes 300 and 400. Therefore, the surface of each turn of the coil 200 is coated with an insulating material, and insulation can be maintained even after winding.

[0053] Specifically, the coil 200 can be formed by spirally winding a metal wire whose surface is coated with an insulating material. The metal wire may be, but is not limited to, a copper wire.

[0054] On the other hand, while the coil component 1000 according to this embodiment is illustrated as an example where the coil 200 is formed from a circular conductor, it is not limited to this, and when the coil 200 is formed using a metal wire that is a flat rectangular wire, the cross-section of each turn of the coil 200 may be square.

[0055] The coil 200 of this embodiment may include, but is not limited to, conductive materials such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo), or alloys thereof.

[0056] Referring to Figures 1 to 5, the coil component 1000 according to this embodiment may include external electrodes 300 and 400 that are arranged on the main body 100 and connected to the coil 200.

[0057] The external electrodes 300 and 400 are configured to electrically connect the coil component 1000 to a circuit board when mounting the coil component 1000 according to this embodiment onto a circuit board or the like. For example, the pad portion 340 of the first external electrode 300 and the pad portion 440 of the second external electrode 400, which are spaced apart from each other on the fifth surface 105 of the main body 100, can be electrically connected to the connection portion of the circuit board.

[0058] Referring to Figures 2 and 3, the first external electrode 300 is positioned on the first surface 101 of the main body 100 and is in contact with and connected to the first lead-out portion 210 that extends out from the first surface 101 of the main body 100, and the second external electrode 400 is positioned on the second surface 102 of the main body 100 and can be in contact with and connected to the second lead-out portion 220 that extends out from the second surface 102 of the main body 100.

[0059] In one embodiment, the external electrodes 300, 400 may include base portions 320, 420 positioned on the first surface 101 or second surface 102 of the main body 100, insertion portions 310, 420 bent from the base portions 320, 420 and at least a portion of which is positioned inside the main body 100, and extension portions 330, 430 bent from the base portions 320, 420 and extending to the third surface 103 and fourth surface 104 of the main body 100, respectively. Furthermore, in one embodiment, the external electrodes 300, 400 may further include pad portions 340, 440 extending from the base portions 320, 420 to the fifth surface 105 of the main body 100.

[0060] Here, the insertion portions 310, 410, the base portions 320, 420, the extension portions 330, 430, and the pad portions 340, 440 may be formed integrally, and for the sake of explanation, the regions of the external electrodes 300, 400 are simply defined separately.

[0061] Referring to Figures 2 to 4, the insertion sections 310 and 410 can have one end positioned inside the main body 100 and the other end bent to connect to the base sections 320 and 420. The insertion sections 310 and 410 can also come into contact with the pull-out sections 210 and 220. At least a portion of the pull-out sections 210 and 220 can be exposed to the outside through the opening O.

[0062] The insertion portions 310 and 410 can perform the function of fixing the external electrodes 300 and 400 to the main body 100, and by being arranged to face the pad portions 340 and 440 in the third direction (T direction), the coil component 1000 according to this embodiment can enhance vibration resistance against vibrations in the third direction (T direction).

[0063] In one embodiment, the other ends of the insertion portions 310 and 410, that is, at least a portion of the area where the insertion portions 310 and 410 are bent and in contact with the base portions 320 and 420, may include an opening O.

[0064] The opening O is a region that penetrates the external electrodes 300 and 400, and reduces the load when bending the external electrodes 300 and 400, thereby preventing damage to the external electrodes 300 and 400. On the other hand, if the external electrodes 300 and 400 have sufficient rigidity to withstand the load generated during the bending process, the opening O in this embodiment may be omitted.

[0065] Referring to Figures 2 and 3, the base portions 320 and 420 of the external electrodes 300 and 400 are configured to extend from the other ends of the insertion portions 310 and 410 and be positioned on the first surface 101 or the second surface 102. Specifically, the base portion 320 of the first external electrode 300 can be positioned on the first surface 101 and connected to the first lead-out portion 210, and the base portion 420 of the second external electrode 400 can be positioned on the second surface 102 and connected to the second lead-out portion 220.

[0066] On the other hand, the drawer sections 210 and 220 may also be covered by a metal layer (not shown) while positioned on the base sections 320 and 420. The metal layer may contain at least one of nickel (Ni), tin (Sn), and copper (Cu), and may be composed of multiple layers. The metal layer may be formed by processes such as dipping and soldering, but is not limited to these. When the drawer sections 210 and 220 are covered with a metal layer and fixed to the base sections 320 and 420, the bonding force between the drawer sections 210 and 220 and the base sections 320 and 420 can be strengthened.

[0067] Referring to Figures 2, 4, and 5, the external electrodes 300 and 400 of the coil component 1000 according to this embodiment may include extensions 330 and 430 that extend from the base portions 320 and 420 to both sides along the second direction (W direction).

[0068] The extensions 330 and 430 extend to both sides along the second direction (W direction) and are bent along the first direction (L direction) and positioned on the third surface 103 and fourth surface 104, thereby strengthening the coupling force between the main body 100 and the external electrodes 300 and 400, and mitigating stress when mounting the coil component 1000 onto the circuit board.

[0069] Specifically, the first external electrode 300 may include a first extension 331 extending from the base portion 320 to the third surface 103, and a second extension 332 extending from the base portion 320 to the fourth surface 104, and a second extension 332 extending from the base portion 420 to the fourth surface 104, and a second extension 434 extending from the base portion 420 to the third surface 103, and a fourth extension 434 extending from the base portion 420 to the fourth surface 104, and a third extension 433 extending from the base portion 420 to the fourth surface 104, and a third extension 434 extending from the base portion 420 to the fourth surface 104, and a third extension 434 extending from the base portion 420 to the fourth surface 104, and a third extension 434 extending from the base portion 420 to the fourth surface 104, and a second extension 331 extending from the base portion 320 to the third surface 103, and a second extension 332 extending from the base portion 320 to the third surface 103, and a second extension 434 extending from the base portion 420 to the fourth surface 104, and a second extension 434 extending from the base portion 420 to the fourth surface 104, and a second extension 434 extending from the base portion 420 to the third surface 104, and a second extension 331 extending from the base portion 320 to the third surface 103, and a second extension 332 extending from the base portion 320 to the third surface 104

[0070] The first extension 331 and the second extension 332 are arranged to face each other in the second direction (W direction), and the third extension 433 and the fourth extension 434 can also be arranged to face each other in the second direction (W direction). With the above configuration, the coil component 1000 according to this embodiment can enhance vibration resistance to vibrations in the second direction (W direction), which can be vulnerable when it has a general electrode configuration without extensions.

[0071] Referring to Figures 2 and 4, the external electrodes 300 and 400 may further include pad portions 340 and 440 that extend from the base portions 320 and 420 to the fifth surface 105 of the main body 100. The pad portions 340 and 440 are configured to be bent from the base portions 320 and 420 and extend to the fifth surface 105 of the main body 100. The pad portions 340 and 440 can be bent and extended in a first direction (L direction) and placed in recesses R1 and R2 formed on the fifth surface 105 of the main body 100. However, the configuration is not limited to this, and if the fifth surface 105 of the main body 100 is a flat surface without recesses R1 and R2, the pad portions 340 and 440 may be placed directly on the fifth surface 105.

[0072] Figure 12 shows the coil component from Figure 1 mounted on a circuit board via a pad.

[0073] Referring to Figures 2, 3, and 12, the pad portions 340 and 440 are configured to be connected to the connection portion of the circuit board when mounting the coil component 1000 according to this embodiment onto the circuit board. For example, by placing a bonding member such as solder between the pad portions 340 and 440 and the connection portion of the circuit board, the coil component 1000 and the circuit can be electrically connected.

[0074] Referring to Figures 1 and 2, the first external electrode 300 of this embodiment may include an insertion portion 310 and a base portion 320 arranged on the first surface 101 of the main body 100, a first extension portion 331 arranged across the first surface 101 and the third surface 103, a second extension portion 332 arranged across the first surface 101 and the fourth surface 104, and a pad portion 340 arranged on the fifth surface 105.

[0075] Furthermore, the second external electrode 400 of this embodiment may include an insertion portion 410 and a base portion 420 arranged on the second surface 102 of the main body 100, a third extension portion 433 arranged across the second surface 102 and the third surface 103, a fourth extension portion 434 arranged across the second surface 102 and the fourth surface 104, and a pad portion 440 arranged on the fifth surface 105.

[0076] Therefore, the external electrodes 300 and 400 of this embodiment are arranged on the first to fifth surfaces 105 of the main body 100 and can be separated from the sixth surface 106. On the other hand, when mounting the coil component 1000 of this embodiment onto a circuit board, stress acting in the first direction (L direction) can be relieved by the base portions 320 and 420 facing the first direction (L direction), stress acting in the second direction (W direction) can be relieved by the ends of the extension portions 331, 332; 433 and 434 facing the second direction (W direction), and stress acting in the third direction (T direction) can be relieved by the insertion portions 310 and 410 and pad portions 340 and 440 facing the third direction (T direction).

[0077] Figure 6 shows the state of the external electrodes 300 and 400 before bending.

[0078] Referring to Figures 2 and 6, after the main body 100 including the coil 200 is formed, with the lead-out portions 210 and 220 connected to the external electrodes 300 and 400 respectively, the external electrodes 300 and 400 are bent in a third direction (T direction) to position the base portions 320 and 420, then bent further in a first direction (L direction) to position the pad portions 340 and 440, and the extension portions 330 and 430 extending from the base portions 320 and 420 are bent in a first direction (L direction) to fix them to the surface of the main body 100.

[0079] Therefore, the external electrodes 300 and 400 of this embodiment make contact with the lead-out portions 210 and 220 over a wide area and include regions that can be bent while surrounding the main body 100. This strengthens the bonding force between the main body 100 and the coil 200, and can alleviate stress acting in the three-axis (L-axis, W-axis, T-axis) directions.

[0080] Figure 7 is a graph showing the standard values ​​of equivalent stress as the minimum distance T1 between the uppermost extension lines of the insertion sections 310 and 410 and the uppermost ends of the extension sections 330 and 440 changes. Here, the standard value of equivalent stress refers to the ratio of the equivalent stress acting on the coil component 1000 according to this embodiment to the equivalent stress acting on the coil component including the external electrodes 300 and 400 without the extension sections 330 and 430.

[0081] Referring to Figures 4, 5, and 7, the maximum length T along the third direction (T direction) of the external electrodes 300 and 400 is E The ratio T1 / T of the minimum distance T1 between the uppermost extension lines of the insertion parts 310 and 410 and the uppermost extensions of the extension parts 330 and 440. E It may be between 13.3% and 50%.

[0082] Here, the maximum length T along the third direction (T direction) of the external electrodes 300 and 400 is EThis may refer to the maximum value among the numerical values ​​(dimensions) of multiple line segments that are connected parallel to the third direction (T direction) and separated from each other in the second direction (W direction), using a side view image as shown in Figure 4 as a reference. For example, the uppermost boundary line of the insertion portion 310 and the lowermost boundary line of the base portion 320 are connected parallel to the third direction (T direction). Multiple line segments parallel to the third direction (T direction) may be equally spaced from each other in the second direction (W direction), but the scope of the present invention is not limited thereto.

[0083] Furthermore, the minimum distance T1 between the uppermost extension lines of the insertion sections 310 and 410 and the uppermost ends of the extension sections 330 and 430 can also be measured in a similar manner. For example, using a side view image as shown in Figure 4 as a reference, an extension line is set by extending the uppermost boundary line of the insertion section 310 shown in the image in parallel with the second direction (W direction), and the distance between this extension line and the uppermost end of the first extension section 331 or the second extension section 332 is connected parallel to the third direction (T direction), and the minimum value among the numerical values ​​(dimensions) of each of the multiple line segments spaced apart from each other in the second direction (W direction) may be used. The multiple line segments parallel to the third direction (T direction) may be equally spaced from each other in the second direction (W direction), but the scope of the present invention is not limited thereto.

[0084] The equivalent stress measurement data related to the graph in Figure 7 is as follows:

[0085] [Table 1]

[0086] Table 1 above shows the maximum length T along the third direction (T direction) of the external electrodes 300 and 400. E The ratio T1 / T of the minimum distance T1 between the uppermost extension lines of the insertion parts 310 and 410 and the uppermost extensions of the extension parts 330 and 440. E This is simulation data showing the equivalent stress acting on coil component 1000 while varying the coefficient of stress.

[0087] Referring to Table 1, FIG. 4, and FIG. 7 above, first, the reference experimental example (Ref.) in Table 1 means a coil component in which external electrodes 300 and 400 that do not include extension parts 330 and 430 are arranged. Based on the equivalent stress of 13.2 MPa acting under such a structure, the maximum length T along the third direction (T direction) of the external electrodes 300 and 400 E The ratio T1 / T of the minimum distance T1 between the uppermost extension lines of the insertion parts 310 and 410 and the uppermost ends of the extension parts 330 and 440 with respect to E was standardized to represent the standard value of the equivalent stress. Here, the length along the third direction (T direction) of the extension parts 330 and 430 was set to 1 mm.

[0088] Referring to Table 1 and FIG. 7, it can be seen that as T1 / T E increases, the standard values of the equivalent stress also increase together. In Experimental Example #9, when T1 / T E reaches 58.3%, the equivalent stress standard value becomes 1.02, and it can be seen that it even exceeds the equivalent stress acting on the reference experimental example (Ref.). In this case, since the stress relaxation effect disappears, T1 / T E is preferably set within the range of 50.〇% or less of Experimental Example #8.

[0089] On the other hand, as T1 / T E decreases, the standard values of the equivalent stress also decrease together. However, referring to Experimental Examples #1 and #, when T1 / T E is lower than 13.3%, the equivalent stress standard value has a difference of 0.01, which can be regarded as a fine difference within the error range. Therefore, the stress relaxation effect becomes constant starting from Experimental Example #2 where T1 / T E is 13.3%. Considering the Poisson's ratio of the materials of the external electrodes 300 and 400 and the margin required during the bending process of the insertion parts 310 and 410, etc., T1 / T E is preferably set within the range of 13.3% or more of Experimental Example #2.

[0090] Therefore, the maximum length T along the third direction (T direction) of the external electrodes 300 and 400 EThe ratio T1 / T of the minimum distance T1 between the uppermost extension lines of the insertion parts 310 and 410 and the uppermost extensions of the extension parts 330 and 440. E It is preferable that this be set to between 13.3% and 50%.

[0091] On the other hand, the external electrodes 300 and 400 of this embodiment may contain conductive materials such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo), or alloys thereof, and may be formed in multiple layers, but are not limited thereto. Furthermore, the external electrodes 300 and 400 may be formed by fixing them to the frame through a rolling process, but are not limited thereto.

[0092] Furthermore, the coil component 1000 according to this embodiment may further include an insulating layer (not shown) that covers the surface of the main body 100.

[0093] The insulating layer can be formed by methods such as printing, vapor deposition, spray coating, and film lamination, but is not limited to these.

[0094] The insulating layer may include thermoplastic resins such as polystyrene, vinyl acetate, polyester, polyethylene, polypropylene, polyamide, rubber, and acrylic; thermosetting resins such as phenol, epoxy, urethane, melamine, and alkyd; photosensitive resins; parylene; SiOx or SiNx. The insulating layer may further contain insulating fillers such as inorganic fillers, but is not limited thereto.

[0095] Second Embodiment and Modified Example Figure 8 is a schematic perspective view showing a coil component 2000 according to a second embodiment of the present invention.

[0096] Comparing Figure 8 with Figure 1, the coil component 2000 according to this embodiment has a different shape for the extensions 330 and 430. Therefore, in describing this embodiment, only the shape of the extensions 330 and 430 that differs from that of the first embodiment of the present invention will be described, and the description in the first embodiment of the present invention can be applied as is to the remaining components.

[0097] Referring to Figure 8, the length L1 of the first extension 331 along the first direction (L direction) in this embodiment may be different from the length L2 of the second extension 332 along the first direction (L direction).

[0098] Furthermore, at least one of the first extension 331 and the second extension 332 may be arranged on the main body 100 so as to pass through a center line CL perpendicular to the first direction (L direction).

[0099] Similarly, the length L3 of the third extension 433 along the first direction (L direction) in this embodiment may be different from the length L4 of the fourth extension 434 along the first direction (L direction).

[0100] Furthermore, at least one of the third extension 433 and the fourth extension 434 may be arranged on the main body 100 so as to pass through a center line perpendicular to the first direction (L direction).

[0101] In this embodiment, the coil component 2000 can improve heat dissipation by increasing the length of the extensions 330 and 340 in the first direction (L direction), thereby increasing the surface area exposed to the outside. Furthermore, diagonal symmetry is maintained between the first external electrode 300 and the second external electrode 400, and the stress acting on the two opposing surfaces of the main body 100 can be kept constant.

[0102] Figure 9 is a schematic perspective view showing a coil component according to a modified example 2000' of the second embodiment of the present invention.

[0103] Comparing Figure 8 and Figure 9, the coil component 2000' in this modified example has a different shape for the extensions 330 and 430. Therefore, in describing this embodiment, only the shape of the extensions 330 and 430 that differs from that of the second embodiment of the present invention will be described, and the description in the second embodiment of the present invention can be applied as is to the remaining components.

[0104] Referring to Figure 9, the extensions 331 and 332 of the first external electrode 300 and the extensions 433 and 434 of the second external electrode 400 can have different lengths. That is, the length L1 of the first extension 331 along the first direction (L direction) may be different from the length L3 of the third extension 433 along the first direction (L direction).

[0105] Furthermore, the length L1 of the second extension 332 along the first direction (L direction) may be different from the length L4 of the fourth extension 434 along the first direction (L direction).

[0106] In this modified example, in addition to the heat dissipation and stress relaxation effects, it is possible to distinguish between the external electrodes 300 and 400, and the mounting direction can be easily identified without separate markings.

[0107] Third Embodiment Figure 10 is a schematic perspective view showing a coil component 3000 according to a third embodiment of the present invention.

[0108] Comparing Figure 10 with Figure 1, the coil component 3000 according to this embodiment has a different shape for the extensions 330 and 430. Therefore, in describing this embodiment, only the shape of the extensions 330 and 430 that differs from that of the first embodiment of the present invention will be described, and the description in the first embodiment of the present invention can be applied as is to the remaining components.

[0109] Referring to Figure 10, each extension 331, 332; 433, 434 of this embodiment can achieve a longer length along the first direction (L direction) than each extension of the first embodiment.

[0110] On the other hand, the first extension 331 and the second extension 332 can each be positioned at a distance from the center line CL perpendicular to the first direction (L direction) on the first surface 101. Similarly, the third extension 433 and the fourth extension 434 can each be positioned at a distance from the center line perpendicular to the first direction (L direction) on the second surface 102.

[0111] In this embodiment, the coil component 3000 can achieve a higher stress relaxation effect as the length of the extensions 330 and 440 increases, and the total area of ​​the extensions 330 and 440 increases, improving the heat dissipation effect via the external electrodes 300 and 400. Furthermore, by symmetrically arranging the extensions 331, 332; 433, and 434 so as not to pass through the center line CL, not only horizontal mounting via the pad portions 340 and 440 as shown in Figure 12, but also vertical mounting via the extensions 330 and 430 as shown in Figure 13 becomes possible.

[0112] Fourth Embodiment Figure 11 is a schematic perspective view showing a coil component 4000 according to a fourth embodiment of the present invention.

[0113] Comparing Figure 11 with Figure 1, the coil component 4000 according to this embodiment differs in that it includes a first groove G1 formed on the main body 100. Therefore, in describing this embodiment, only the first groove G1, which differs from that of the first embodiment of the present invention, will be described, and the description in the first embodiment of the present invention can be applied as is to the remaining components.

[0114] Referring to Figure 11, a first groove G1 is formed on at least one of the third surface 103 and the fourth surface 104 of the main body 100, and the ends of the extensions 331, 332; 433, 434 can each be fixed to the first groove G1. The first groove G1 may also be arranged in a direction parallel to the third direction (T direction).

[0115] The first groove G1 may be multiple in number, preferably formed in the same number as the extensions 331, 332; 433, 434. For example, the third surface 103 and the fourth surface 104 may each contain two first grooves G1, for a total of four grooves G1, but this is not limited to this.

[0116] In this embodiment, the coil component 4000 has its ends fixed into the first groove G1 formed in the main body 100, thereby strengthening the bonding force between the main body 100 and the external electrodes 300 and 400, and improving the vibration resistance of the coil component 4000.

[0117] Fifth Embodiment Figure 12 shows the coil component 1000 of Figure 1 mounted on the circuit board 10 via pad portions 340 and 440, Figure 13 shows the coil component 1000 of Figure 1 mounted on the circuit board via extension portions 332 and 433, and Figure 14 is a schematic perspective view showing the coil component 5000 according to the fifth embodiment of the present invention.

[0118] When mounting the coil component 1000 onto the circuit board 10, it is generally mounted horizontally as shown in Figure 12, with the pad portions 340 and 440 of the coil component 1000 connected to the connection portion 11 of the circuit board 10. However, when the mounting area is limited, the coil component 1000 can be mounted vertically as shown in Figure 13, with the extension portions 332 and 433 of the coil component 1000 connected to the connection portion 11 of the circuit board 10.

[0119] The coil component 5000 according to the fifth embodiment of the present invention corresponds to an embodiment suitable for vertical mounting as shown in Figure 13.

[0120] Comparing Figure 14 with Figure 1, the coil component 5000 according to this embodiment differs in that it includes a second groove G2 formed on the main body 100. Therefore, in describing this embodiment, only the second groove G2, which differs from that of the first embodiment of the present invention, will be described, and the description in the first embodiment of the present invention can be applied as is to the remaining components.

[0121] Referring to Figure 14, a second groove G2 is formed in at least one of the regions between the first surface 101 and the third surface 103 of the main body 100, and between the second surface 102 and the third surface 103, and the ends of the extensions 331 and 433 can be fixed to the second groove G2.

[0122] There may be multiple second grooves G2, and it is preferable that the number of second grooves G2 be equal to the number of extensions 331 and 433 that are not mounted on the circuit board. For example, as in this embodiment, two second grooves G2 may be formed on the main body 100, and the ends of the first extension 331 and the ends of the third extension 433 may each be fixed to the second grooves G2.

[0123] Sixth and seventh embodiments Figure 15 is a schematic perspective view showing a coil component 6000 according to the sixth embodiment of the present invention, and Figure 16 is a schematic perspective view showing a coil component 7000 according to the seventh embodiment of the present invention.

[0124] Comparing Figures 15 and 16 with Figure 1, respectively, this embodiment differs in the shape of the extensions 330 and 430. Therefore, in describing this embodiment, only the shape of the extensions 330 and 430 that differ from the first embodiment of the present invention will be described, and the description in the first embodiment of the present invention can be applied as is to the remaining configuration.

[0125] Referring to Figure 15, the coil component 6000 according to the sixth embodiment of the present invention may be formed with a larger size along the third direction (T direction) of the extensions 331, 332, 433, and 434 than the extensions 331, 332, 433, and 434 of the first embodiment.

[0126] In this embodiment, as the size of the extensions 331, 332, 433, and 434 along the third direction (T direction) increases, the coupling force between the main body 100 and the external electrodes 300 and 400 can be further strengthened, and the vibration resistance of the coil component 6000 can be further improved when mounted on a circuit board.

[0127] Referring to Figure 16, the coil component 7000 according to the seventh embodiment of the present invention can have at least one of the first extension 331, second extension 332, third extension 433, and fourth extension 434 branched into two regions. For example, the first extension 331 may be branched into two regions 331a and 331b, and the second extension 332 may be branched into two regions 332a and 332b. Similarly, the third extension 433 may be branched into two regions 433a and 433b, and the fourth extension 434 may be branched into two regions 434a and 434b.

[0128] In this embodiment, when the extensions 331, 332, 433, and 434 are formed by branching into two regions, even if one of the regions is damaged, the remaining region can maintain the bonding force between the main body 100 and the external electrodes 300 and 400. The gap between the two regions allows elastic force to act in part, improving vibration resistance against vertical vibrations.

[0129] Although one embodiment of the present invention has been described above, any person with ordinary skill in the art can modify and change the present invention in various ways by adding, changing, or deleting components, etc., without departing from the spirit of the invention as described in the claims, and this can also be said to be within the scope of the rights of the present invention. [Explanation of Symbols]

[0130] 10: Circuit board 11: Connection part 100: Main unit 110: Core G1: 1st Groove G2: 2nd Groove R1: First recess R2: Second recess 200: Coil 210: 1st drawer 220:Second drawer 300: 1st external electrode 400: 2nd external electrode 310, 410: Insertion part 320, 420: Base section 330, 430: Extension part 331: 1st extension 332:Second extension part 433:Third extension 434: 4th extension 340, 440: Pad section O: Opening 500: Metal layer 1000, 2000, 2000', 3000, 4000, 5000, 6000, 7000: Coil parts

Claims

1. A body including a first surface and a second surface facing in the first direction, and a third surface and a fourth surface facing in the second direction perpendicular to the first direction, A coil arranged inside the main body, The body includes an external electrode arranged on the main body and connected to the coil, The external electrode is a coil component comprising a base portion disposed on the first or second surface, an insertion portion bent from the base portion and at least a portion of which is disposed inside the main body, and extension portions bent from the base portion and extending to the third and fourth surfaces, respectively.

2. The main body further includes a fifth and a sixth surface facing a third direction perpendicular to the first and second directions, respectively. The coil component according to claim 1, wherein the external electrode further includes a pad portion extending from the base portion to the fifth surface.

3. The coil component according to claim 2, wherein the base portion, the insertion portion, the extension portion, and the pad portion are integrally formed.

4. The coil component according to claim 2, wherein the external electrode is spaced apart from the sixth surface.

5. The maximum length T of the external electrode along the third direction Ｅ The ratio T1 / T of the minimum distance T1 between the uppermost extension line of the insertion portion and the uppermost end of the extension portion. Ｅ The coil component according to claim 2, wherein the ratio is 13.3% or more and 50% or less.

6. The extension includes a first extension that extends at least a portion of the third surface, and a second extension that extends at least a portion of the fourth surface. The coil component according to claim 1, wherein the length of the first extension along the first direction is different from the length of the second extension along the first direction.

7. The coil component according to claim 6, wherein at least one of the first extension and the second extension passes through a center line perpendicular to the first direction on the main body.

8. The coil component according to claim 6, wherein each of the first extension and the second extension is spaced apart from a center line perpendicular to the first direction on the main body.

9. The external electrode includes a first external electrode disposed on the first surface and a second external electrode disposed on the second surface. The first external electrode includes a first extension portion that extends to the third surface in at least a portion thereof, and a second extension portion that extends to the fourth surface in at least a portion thereof. The coil component according to claim 1, wherein the second external electrode includes a third extension portion that extends at least a portion of the third surface, and a fourth extension portion that extends at least a portion of the fourth surface.

10. The coil component according to claim 9, wherein the length of the first extension along the first direction is different from the length of the third extension along the first direction.

11. The coil component according to claim 9, wherein at least one of the first extension, the second extension, the third extension, and the fourth extension is branched into two regions.

12. A first groove is formed on at least one of the third and fourth surfaces. The coil component according to claim 2, wherein the end of the extension is fixed to the first groove.

13. The coil component according to claim 12, wherein the first groove is arranged in parallel with the third direction.

14. A second groove is formed in at least one of the regions between the first surface and the third surface, and the region between the second surface and the third surface. The coil component according to claim 2, wherein the end of the extension is fixed to the second groove.

15. The coil component according to claim 14, wherein the second groove is arranged in parallel with the third direction.

16. The coil component according to any one of claims 1 to 15, wherein at least a portion of the other end of the insertion portion includes an opening.

17. The coil component according to any one of claims 1 to 15, wherein the coil includes a lead-out portion that is drawn out onto the main body, and the lead-out portion is disposed between the main body and the external electrode.

18. A recess is formed in at least one of the regions between the first surface and the fifth surface, and the region between the second surface and the fifth surface. The coil component according to claim 2, wherein the base portion and the pad portion are arranged in the recess.

19. A main body including a first and second surface facing in the first direction, a third and fourth surface facing in the second direction, and a fifth and sixth surface facing in the third direction, A coil arranged inside the main body, The main body is arranged and connected to the coil, and includes a first external electrode and a second external electrode facing each other in the first direction, Each of the first external electrode and the second external electrode includes an insertion portion which is at least partly disposed within the main body, extension portions which extend to both sides along the second direction and are bent in the first direction, and a pad portion which extends to the fifth surface. A coil component in which each end of the extension portion faces the second direction, and the insertion portion and the pad portion face the third direction.

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