Coil components

Abstract

This invention provides a coil component with improved vibration resistance by avoiding resonance between the coil component's natural frequency and its operating frequency. [Solution] The coil component 1000 includes a main body 100 including a first surface 101 and a second surface 102 facing each other in a first direction, and a third surface 103 and a fourth surface 104 facing each other in a second direction perpendicular to the first direction, a coil 200 disposed within the main body and including a first lead-out portion 210 extending out to the first surface and a second lead-out portion 220 extending out to the second surface, and a first external electrode 300 connected to the first lead-out portion and a second external electrode 400 connected to the second lead-out portion, wherein the first and second external electrodes include an insertion portion which is at least a part of which is disposed within the main body, an extension portion which is bent from the insertion portion and extends in a second direction, and a pad portion which is bent from the extension portion and extends in a third direction, and the average length of the extension portion along the second direction is set to be 0.5 times or less the average thickness of the main body along the second direction and to be inversely proportional to the mass of the coil component.

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. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2017-045742 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] One of the embodiments of the present invention is to provide a coil component with improved vibration resistance by designing the average length of the region in which the external electrodes are exposed on the side surface of the main body to be inversely proportional to the mass of the coil component, thereby avoiding resonance between the natural frequency of the coil component and the operating frequency.

[0007] Another object of the embodiments of the present invention is to design the average length of the region where the external electrode is exposed on the side surface of the main body to have a proportional relationship with the cross-sectional area of the external electrode on a plane perpendicular to the winding shaft of the coil, thereby avoiding resonance between the natural frequency and the operating frequency of the coil component and providing a coil component with improved vibration resistance.

Means for Solving the Problems

[0008] According to one aspect of the present invention, a main body including a first surface and a second surface facing each other in a first direction, and a third surface and a fourth surface facing each other in a second direction perpendicular to the first direction, a coil disposed in the main body and including a first lead-out portion led out to the first surface and a second lead-out portion led out to the second surface, a first external electrode connected to the first lead-out portion, and a second external electrode connected to the second lead-out portion, wherein the first external electrode and the second external electrode include an insertion portion at least partially disposed in the main body, an extension portion bent from the insertion portion and extending in the second direction, and a pad portion bent from the extension portion and extending to the third surface, and the average length of the extension portion along the second direction is 0.5 times or less of the average thickness of the main body along the second direction, and can be set to have an inverse proportional relationship with the mass of the coil component.

[0009] According to another aspect of the present invention, a main body including a first surface and a second surface facing each other in a first direction, and a third surface and a fourth surface facing each other in a second direction perpendicular to the first direction, a coil disposed in the main body and including a first lead-out portion led out to the first surface and a second lead-out portion led out to the second surface, a first external electrode connected to the first lead-out portion, and a second external electrode connected to the second lead-out portion, wherein the first external electrode and the second external electrode include an insertion portion at least partially disposed in the main body, an extension portion bent from the insertion portion and extending in the second direction, and a pad portion bent from the extension portion and extending to the third surface, and the average length of the extension portion along the second direction is 0.5 times or less of the average thickness of the main body along the second direction, and can be set to have a proportional relationship with the cross-sectional area of the extension portion on a cross-section perpendicular to the second direction.

Effects of the Invention

[0010] According to an embodiment of the present invention, by designing the average length of the region where the external electrode is exposed on the side surface of the main body to have an inverse proportional relationship with the mass of the coil component, resonance between the natural frequency and the operating frequency of the coil component can be prevented, and the vibration resistance of the coil component can be improved.

[0011] According to an embodiment of the present invention, by designing the average length of the region where the external electrode is exposed on the side surface of the main body to have a proportional relationship with the cross-sectional area of the external electrode on a plane perpendicular to the coil axis, resonance between the natural frequency and the operating frequency of the coil component can be prevented, and the vibration resistance of the coil component can be improved.

Brief Description of the Drawings

[0012] [Figure 1] It is a perspective view schematically showing a coil component according to a first embodiment of the present invention. [Figure 2] It is a bottom view of FIG. 1. [Figure 3] It is a diagram schematically showing the process of forming the coil and the external electrode of the coil component according to the first embodiment of the present invention. [Figure 4] It is an exploded perspective view of FIG. 1. [Figure 5] It is a diagram showing a cross-section taken along line I-I' of FIG. 1. [Figure 6] It is a diagram showing a cross-section taken along line II-II' of FIG. 1. [Figure 7] It is a perspective view schematically showing a coil component according to a second embodiment of the present invention. [Figure 8] It is a diagram schematically showing the process of forming the coil and the external electrode of the coil component according to the second embodiment of the present invention. [Figure 9] It is a diagram showing a cross-section taken along line III-III' of FIG. 7. [Figure 10] It is a graph showing the average length of the extension part according to the mass of the coil component when the average thickness of the extension part is 0.15 mm. [Figure 11]This graph shows the average length of the extension portion according to the mass of the coil component, when the average thickness of the extension portion is 0.15 mm. [Figure 12] This graph shows the average length of the extension portion according to the mass of the coil component, when the average thickness of the extension portion is 0.15 mm. [Figure 13] This graph shows the average length of the extension portion according to the mass of the coil component, when the average thickness of the extension portion is 0.2 mm. [Figure 14] This graph shows the average length of the extension portion according to the mass of the coil component, when the average thickness of the extension portion is 0.2 mm. [Figure 15] This graph shows the average length of the extension portion according to the mass of the coil component, when the average thickness of the extension portion is 0.2 mm. [Modes 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, operations, components, parts, or combinations thereof described in the specification, and should be understood not to preemptively exclude the existence or possibility of the addition of one or more other features, figures, stages, operations, 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 descriptions 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 showing a coil component according to the first embodiment of the present invention; Figure 2 is a bottom view of Figure 1; Figure 3 is a schematic diagram showing the process of forming the coil and external electrode of the coil component according to the first embodiment of the present invention; Figure 4 is an exploded perspective view of Figure 1; Figure 5 is a diagram showing a cross-section along the line I-I' in Figure 1; and Figure 6 is a diagram showing a cross-section along the line II-II' in Figure 1.

[0021] On the other hand, in order to more clearly show the connections between the components in Figures 1 to 6, the insulating layer on the surface of the main body 100 applicable to this embodiment is omitted.

[0022] Referring to Figures 1 to 6, 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, 400, and may further include lead-out portions 210, 220 included at both ends of the coil 200, and a metal layer 500 covering the lead-out portions 210, 220.

[0023] Unlike the structure in which external electrodes 300 and 400 are plated onto the main body 100, the coil component 1000 according to this embodiment can have a structure in which the external electrodes 300 and 400 are separately formed using a frame such as a metal plate, and the main body 100 is formed with the coil 200 such as a winding wire connected to the external electrodes 300 and 400, and the external electrodes 300 and 400 are bent and arranged to surround the sides and bottom of the main body 100.

[0024] On the other hand, when the coil component 1000 according to this embodiment is mounted on a circuit board or the like and used, it may be exposed to vibrations depending on the operating environment. For example, there is a risk of resonance occurring between the operating frequency range (10 to 2000 kHz) according to the standard specifications for automotive electronic components such as AEC-Q200 and the natural frequency of the coil component 1000.

[0025] Therefore, in this embodiment, the coil component 1000 has a low center of gravity design, so that the extensions 320 and 420, which are regions of the external electrodes 300 and 400 that are located on the side surface of the main body 100, are positioned at a low position, and by appropriately setting the average length of the extensions 320 and 420 to have a constant relationship with the mass of the coil component 1000 or the cross-sectional area of ​​the extensions 320 and 420, the natural frequency of the coil component 1000 can be moved outside the range of operating frequencies, thereby enhancing the vibration resistance of the coil component 1000 mounted on the circuit board.

[0026] The main components constituting the coil component 1000 according to this embodiment will be described in detail below.

[0027] 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.

[0028] The main body 100 can be formed into a hexahedral shape overall.

[0029] The main body 100 includes a first surface 101 and a second surface 102 that face each other in the length direction L (first direction), a third surface 103 and a fourth surface 104 that face each other in the thickness direction T (second direction), and a fifth surface and a sixth surface that face each other in the width direction W (third direction). The first surface 101, the second surface 102, the fifth surface 105, and the sixth surface 106 of the main body 100 each correspond to the wall surfaces of the main body 100 that connect the third surface 103 and the fourth surface 104 of the main body 100.

[0030] Referring to Figures 1 and 5, the main body 100 has, for example, an average thickness T along the second direction T. B The thickness can be formed in the range of 3mm to 6mm, but is not limited to this. On the other hand, the average thickness T of the main body 100 B The example values ​​given do not reflect process errors; therefore, values ​​within the range of recognized process errors should be considered equivalent to the example values ​​mentioned above.

[0031] The average thickness T of the main body 100 mentioned above. B This can mean the arithmetic mean of at least three or more line segments whose dimensions are separated from each other in the length direction L, based on 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 main body 100. The two outermost boundary lines of the main body 10 facing the thickness direction T shown in the image are connected parallel to the thickness direction T, and the dimensions are separated from each other in the length direction L. Here, the multiple line segments parallel to the thickness direction T may be equally spaced from each other in the length direction L, but the scope of the present invention is not limited thereto.

[0032] Alternatively, the average thickness T of the main body 100 BThe average thickness T of the body 100 may be measured by the micrometer measurement method. In the micrometer measurement method, a zero point is set with a Gage R&R (Repeatability and Reproducibility) micrometer, the body 100 is inserted between the tips of the micrometer, and the measurement is taken by rotating the measuring lever of the micrometer. On the other hand, the average thickness T of the body 100 can be measured by the micrometer measurement method. B When measuring this, it can mean the arithmetic mean of the values ​​obtained by measuring the thickness of the main body 100 multiple times.

[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] Referring to Figure 3, the main body 100 can be formed, for example, by separating and forming two main body regions 100a and 100b around the coil 200, and then joining them together to form a single main body 100. In this case, the density of the two main body regions 100a and 100b may differ depending on the formation temperature and pressure, and the components they contain may also differ in some respects, 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] The body 100 may include a core 110. The core 110 may represent 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.

[0043] Referring to Figures 1 and 4, recesses R can be formed in the region where the first surface 101 and the third surface 103 of the main body 100 are connected to each other, and in the region where the second surface 102 and the third surface 103 are connected.

[0044] In this embodiment, recess R corresponds to a region where a step is formed on the inside of the main body 100 to accommodate the pull-out sections 210, 220 and the external electrodes 300, 400. For the sake of explanation, the region in which recess R is formed is defined as being included in the first surface 101, the second surface 102, and the third surface 103.

[0045] Extensions 320 and 420 of the external electrodes 300 and 400 can be placed in the recesses R formed on the first surface 101 and the second surface 102, and pad portions 330 and 430 of the external electrodes 300 and 400 can be placed in the recess R formed on the third surface 103.

[0046] On the other hand, the lead-out portions 210, 220 and external electrodes 300, 400 of this embodiment may not have recesses R formed and may be arranged in a form that protrudes from the flat surface of the main body 100, but is not limited to this.

[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 1, 4-6, 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 can be positioned between the main body 100 and the first external electrode 300, and the second lead-out portion 220 can be positioned between the main body 100 and the second external electrode 400. The first lead-out portion 210 can extend along the surface of a recess R formed on the first surface 101 and the third surface 103 of the main body 100, and the second lead-out portion 220 can extend along the surface of a recess R formed along the second surface 102 and the third surface 103 of the main body 100.

[0050] Referring to Figures 3 and 5, 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 can be made 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 can be made wider than the diameter of the coil 200.

[0051] By having a surface bonding structure between the lead-out portions 210, 220 and the external electrodes 300, 400 in this way, the contact area is increased and bonding reliability is improved, R dc It can also have the effect of improving the characteristics.

[0052] The coil 200 in this embodiment corresponds to an air-core coil and may be a wound coil, but is not limited thereto. 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 exemplifies a case 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 rectangular.

[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 6, 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 and the circuit board when mounting the coil component 1000 according to this embodiment onto a circuit board or the like. For example, the first external electrode 300 and the second external electrode 400, which are arranged spaced apart from each other on the third surface 103 of the main body 100, may be electrically connected to the connection portion of the circuit board.

[0058] Specifically, 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] Referring to Figures 1 and 5, the first external electrode 300 and the second external electrode 400 may include insertion portions 310, 410, at least a portion of which are placed inside the main body 100; extension portions 320, 420 that are bent from the insertion portions 310, 410 and extend in the second direction T; and pad portions 330, 430 that are bent from the extension portions 320, 420 and extend to the third surface 103 of the main body 100.

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

[0061] Referring to Figures 3 and 5, the insertion portions 310 and 410 can be positioned so that at least a portion of them is inserted into the main body 100 and can be in contact with the withdrawal portions 210 and 220. The insertion portions 310 and 410 serve to fix the external electrodes 300 and 400 to the main body 100 and may include protrusions P at their inner ends.

[0062] The protruding portion P performs an anchoring function within the main body 100, and is configured to further strengthen the coupling force between the external electrodes 300 and 400 and the main body 100. The protruding portion P may have a shape that protrudes from the inner ends of the insertion portions 310 and 410 along the third direction W, but is not limited to this, and the protruding direction or shape of the protruding portion P can be formed in various ways. Furthermore, the protruding portion P may be formed on both the inner ends of the insertion portions 310 and 410, or on only one of them.

[0063] Referring to Figures 1 and 5, the extensions 320 and 420 are bent from the insertions 310 and 410 and extend along the second direction T. The coil component 1000 according to this embodiment is designed to have a low center of gravity in order to improve vibration resistance, and therefore the average length L of the extensions 320 and 420 along the second direction T is E The average thickness T along the second direction T of the main body 100 is BIt can be 0.5 times or less. That is, referring to FIG. 5, when assuming a virtual center line CL parallel to the first direction L passing through the center of the main body 100, the extension parts 320 and 420 can be arranged close to the third surface 103 which is the mounting surface with reference to the center line CL.

[0064] Referring to FIGS. 4 and 5, the extension part 320 of the first external electrode 300 can be arranged in the recess R formed in the first surface 101 of the main body 100, and the extension part 420 of the second external electrode 400 can be arranged in the recess R formed in the second surface 102 of the main body 100.

[0065] When the coil component 1000 according to the present embodiment is mounted on a circuit board, the extension parts 320 and 420 that support the main body 100 on both sides can be equivalently replaced like a kind of spring in relation to the generated vibration. Therefore, referring to FIGS. 5 and 6, the average length L E of the extension parts 320 and 420 is appropriately designed according to the mass of the coil component 1000 or the cross-sectional area (A) of the extension parts 320 and 420 on the cross-section (L-W cross-section) perpendicular to the second direction T, so that the natural frequency of the coil component 1000 coincides with the operating frequency, and the risk of resonance can be reduced.

[0066] Referring to FIG. 5, the coil component 1000 according to the present embodiment has an average thickness T B along the second direction T of the main body 100 which may be 3 mm or more and 6 mm or less. On the other hand, the average length L E along the second direction of the extension parts 320 and 420 may be 1 mm or more and 2 mm or less. Considering the manufacturing process of forming the extension parts 320 and 420 by bending the metal plate-shaped external electrodes 300 and 400 twice, the extension parts 320 and 420 with an average length L E less than 1 mm are difficult to manufacture, and considering the low center of gravity design for improving vibration resistance, the extension parts 320 and 4​​​​​Since it is 0.5 times or less, preferably the average thickness T along the second direction T of the main body 100 is B The average length L of the extensions 320 and 420 along the second direction T. E Ratio (L E / T B ) can be formed to be between 0.17 and 0.5, but is not limited to this.

[0067] Here, the average length L of the extensions 320 and 420 is... E Referring to Figure 5, the average thickness T of the extensions 320 and 420 can be defined as the arithmetic mean of at least three of the numerical values ​​(dimensions) of a plurality of line segments that are spaced apart in the first direction L, connected parallel to the second direction T, with respect to an 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. The plurality of line segments parallel to the second direction T may be equally spaced in the first direction L, but the scope of the present invention is not limited thereto. E and average width W E The average length L E It can be measured using a similar method.

[0068] Furthermore, the cross-sectional area (A) of the extensions 320 and 420 on the cross section perpendicular to the second direction T (LW cross section) is, as shown in Figure 6, the average thickness T of the extensions 320 and 420 along the first direction L on the cross section perpendicular to the second direction T. E and the average width W along the third direction W. EIt can be defined as the product of . On the other hand, as another example for measuring the cross-sectional area (A) of the extensions 320 and 420, the cross-sectional area of ​​the extensions 320 and 420 shown in the image can be calculated using the Image J program tool, based on an optical microscope image or SEM (Scanning Electron Microscope) image of a cross section parallel to the third surface 103 of the main body 100 and passing through the center of the main body 100.

[0069] Average length L along the second direction T of extensions 320 and 420 E This can be set to have an inverse relationship with the mass of the coil component 1000. Also, the average length L along the second direction T of the extensions 320 and 420. E This can be set to have an inverse relationship with the mass of the coil component 1000. Also, the average length L along the second direction T of the extensions 320 and 420. E This can be set to be proportional to the cross-sectional area (A) of the extensions 320 and 420 on a cross section (LW section) perpendicular to the second direction T. As a result, the average length L of the extensions 320 and 420 along the second direction T is determined. E It can be designed to satisfy the following mathematical formula 1.

[0070] [Mathematical formula 1]

number

[0071] In the above mathematical formula 1, L E The following can be defined as follows: is the average length of the extensions 320 and 420 along the second direction T, E is the elastic modulus of the extensions 320 and 420, f is the intrinsic vibration frequency of the coil component 1000, A is the cross-sectional area of ​​the extensions 320 and 420 on the LW section, and m is the mass of the coil component 1000.

[0072] Here, the natural frequency (f) may be set to exceed 0.2 MHz. Preferably, the natural frequency (f) can be set to have a value between 0.35 MHz and 0.6 MHz, but is not limited thereto.

[0073] This is because the AEC-Q200 and other standards for automotive electronic components specify a usage frequency range of 10 to 2000 kHz. By designing the coil component 1000 to have a natural frequency higher than this usage frequency range, the risk of resonance is reduced and vibration resistance is enhanced.

[0074] In addition, the elastic modulus (E) of the extensions 320 and 420 in the above mathematical formula 1 may be set to 128 GPa, but is not limited to this.

[0075] The above mathematical formula 1 is the result of applying Hooke's Law to Hooke's Law by equivalently substituting extensions 320 and 420 with two springs connected in parallel, in order to derive the natural frequency under a vibration environment when mounting the coil component 1000 according to this embodiment onto a circuit board.

[0076] First, the spring deformation (δ) is proportional to the spring length (l) and the external force (F), and inversely proportional to the cross-sectional area (A), so it can be summarized in the following mathematical equations 2 and 3.

[0077] [Mathematical formula 2]

number

[0078] [Mathematical formula 3]

number

[0079] By introducing the elastic modulus (E) and spring constant (k) of the extensions 320 and 420 as proportionality constants into the above mathematical equation 3, it can be summarized into the following mathematical equations 4 to 6.

[0080] [Mathematical formula 4]

number

[0081] [Mathematical formula 5]

number

[0082] [Mathematical formula 6]

number

[0083] The extensions 320 and 420 of the coil component 1000 according to this embodiment can be equivalently replaced by two springs connected in parallel, and can be summarized in the following mathematical formula 7.

[0084] [Mathematical formula 7]

number

[0085] Using the relationship between the natural frequency (f), mass (m), and spring constant (k) of coil component 1000, the relationship can finally be summarized in the following mathematical equations 8 to 10.

[0086] [Mathematical formula 8]

number

[0087] [Mathematical formula 9]

number

[0088] [Mathematical formula 10]

number

[0089] Therefore, the spring length (l) in the above mathematical formula 10 is the average length L along the second direction T of the extensions 320 and 420 in this embodiment. E By substituting this, we can derive a relationship like the one shown in mathematical formula 1 above.

[0090] Specific experimental data related to this will be discussed later, referring to Figures 10 to 15.

[0091] Referring to Figures 1, 2, and 5, the pad portions 330 and 430 are bent from the extension portions 320 and 420 and extend to the third surface 103 of the main body 100. The pad portions 330 and 430 can extend in the first direction L and be positioned in the recess R formed on the third surface 103 of the main body 100.

[0092] The pad portions 330 and 430 are configured to connect to the connection portion of the circuit board when mounting the coil component 1000 according to this embodiment onto the circuit board. For example, the pad portions 330 and 430 can electrically connect the coil component 1000 and the circuit board by placing a connecting member such as solder between the connection portion of the circuit board.

[0093] On the other hand, referring to Figures 1 and 3, the external electrodes 300 and 400 of this embodiment may further include openings O formed in at least a portion of the bent region between the insertion portions 310 and 410 and the extension portions 320 and 420, and the bent region between the extension portions 320 and 420 and the pad portions 330 and 430.

[0094] The opening O is configured to penetrate the external electrodes 300 and 400, thereby reducing the load during the bending process of the external electrodes 300 and 400 and 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 can be omitted.

[0095] The external electrodes 300 and 400 in 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.

[0096] On the other hand, although not shown in the figures, the coil component 1000 according to this embodiment may further include an insulating layer that covers the surface of the main body 100.

[0097] The insulating layer can be formed by methods such as printing, vapor deposition, spray coating, and film lamination, but is not limited to these.

[0098] 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.

[0099] Coil component manufacturing process Referring to Figure 3, in this embodiment, the coil component 1000 can first have external electrodes 300 and 400 formed on a frame, and the coil 200 can be placed on the external electrodes 300 and 400. Here, the external electrodes 300 and 400 can have protrusions P and openings O formed on them before being coupled with the coil 200, and the lead-out portions 210 and 220 at both ends of the coil 200 can be coupled with the external electrodes 300 and 400 after the insulating layer on the surface is removed and the coil is rolled.

[0100] After the coil 200 is placed on the external electrodes 300, 400, a metal layer 500 can cover the coil 200 for bonding. The metal layer 500 may contain at least one of nickel (Ni), tin (Sn), and copper (Cu), and may be composed of multiple layers. The metal layer 500 may be formed by processes such as dipping and soldering, but is not limited to these.

[0101] Referring to Figure 4, the coil 200 formed in Figure 3 and the external electrodes 300 and 400 are joined together. Two regions 100a and 100b of the main body 100, formed via a mold, can be compressed and hardened vertically to form a single main body 100. In Figure 4, the orientation is inverted vertically compared to Figure 3. Using the orientation in Figure 4 as a reference, a portion of the upper region 100a of the main body 100 can fill the air core of the coil 200 to form a core 110, but this is not the only possible outcome.

[0102] Referring to Figures 4 and 5, after the formation of the main body 100, the structure in which the lead-out portions 210, 220, external electrodes 300, 400 and metal layer 500 are joined is bent once in the second direction T, and then bent once again in the first direction L, thereby forming the insertion portions 310, 410, extension portions 320, 420, and pad portions 330, 430 of the external electrodes 3000, 400.

[0103] Second Embodiment Figure 7 is a schematic perspective view showing a coil component according to a second embodiment of the present invention, and Figure 8 is a schematic diagram showing the process of forming the coil and external electrodes of the coil component according to the second embodiment of the present invention. Figure 9 shows a cross-section along the line III-III' in Figure 1.

[0104] Comparing Figures 7, 8, and 9 with Figures 1, 3, and 5 respectively, the coil component 2000 according to this embodiment differs in that the first lead portion 210 and the second lead portion 220 extend only to the first surface 101 and the second surface 102 of the main body 100, respectively, and do not extend to the third surface 103.

[0105] Therefore, in describing this embodiment, only the form and arrangement of the drawer sections 210 and 220 that differ from those 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 configurations.

[0106] Referring to Figures 7 to 9, at least one of the first lead portion 210 and the second lead portion 220 of the coil component 2000 according to this embodiment may be arranged at a distance from the pad portions 330 and 430.

[0107] Specifically, at least one of the first pull-out portion 210 and the second pull-out portion 220 can be positioned so as not to extend to the third surface 103 of the main body 100, and as a result, the pull-out portions 210 and 220 can be made shorter compared to the coil component 1000 according to the first embodiment.

[0108] In the case of the coil component 2000 according to this embodiment, since the pull-out portions 210 and 220 are not arranged on the third surface 103 of the main body 100, the pad portions 330 and 430 are in closer contact with the third surface 103 of the main body 100 by the thickness of the pull-out portions 210 and 220, which may be advantageous in reducing the overall thickness of the coil component 2000.

[0109] Furthermore, assuming that the lengths of the extensions 320 and 420 are the same as in the first embodiment, it is possible to secure an even larger effective volume for arranging the magnetic material in the main body 100, thereby improving the inductance characteristics.

[0110] Experimental data Figures 10 to 15 are graphs showing the relationship between the mass of a coil component 1000 according to the first embodiment of the present invention and the average length of the extension, showing the resulting values ​​for each natural frequency while adjusting the average width and average thickness of the extension.

[0111] Figures 10 to 12 are graphs showing the average length of the extension due to the mass of the coil component when the average thickness of the extension is 0.15 mm, and Figures 13 to 15 are graphs showing the average length of the extension due to the mass of the coil component when the average thickness of the extension is 0.2 mm.

[0112] [Table 1]

[0113] Referring to Figures 10 to 12 and Table 1 above, as the mass (m) of the coil component increases, the average length L along the second direction T of the extensions 320 and 420 increases. E As this decreases, the average length L along the second direction T of the extensions 320 and 420 decreases. E It can be seen that it is inversely proportional to the mass (m) of the coil component.

[0114] Furthermore, in Table 1, the average thickness T of the extension is shown. E With the extension fixed at 0.15mm, the average width W of the extension is... E As it increases, the average length L along the second direction T of the extensions 320 and 420 increases. E As this increases, the average length L along the second direction T of the extensions 320 and 420 increases. E It can be seen that this is proportional to the cross-sectional area (A) of the extensions 320 and 420 on a cross section perpendicular to the second direction.

[0115] [Table 2]

[0116] Referring to Figures 13 to 15 and Table 2 above, the average length L along the second direction T of the extensions 320 and 420 increases as the mass (m) of the coil component increases. E As this decreases, the average length L along the second direction T of the extensions 320 and 420 decreases. E It can be seen that it is inversely proportional to the mass (m) of the coil component.

[0117] Furthermore, in Table 2, the average thickness T of the extension is shown.E With the extension fixed at 0.15mm, the average width W of the extension is... E As it increases, the average length L along the second direction T of the extensions 320 and 420 increases. E As this increases, the average length L along the second direction T of the extensions 320 and 420 increases. E It can be seen that this is proportional to the cross-sectional area (A) of the extensions 320 and 420 on the cross section perpendicular to the second direction T.

[0118] Furthermore, comparing Table 1 and Table 2, the mass (m) of the coil component and the average width W of the extension section are as follows: E With the extension fixed, the average thickness T of the extension is... E If it increases to 0.2 mm, the average length L along the second direction T of the extensions 320 and 420 will increase. E As this increases, the average length L along the second direction T of the extensions 320 and 420 is also increased. E It can be seen that this is proportional to the cross-sectional area (A) of the extensions 320 and 420 on the cross section perpendicular to the second direction T.

[0119] As described above, one embodiment of the present invention has been explained, but a person with ordinary skill in the art can modify and change the present invention in various ways, such as by adding, changing, or deleting components, 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]

[0120] 100: Main unit 110: Core R: Recess 200: Coil 210: 1st drawer 220:Second drawer 300: 1st external electrode 400: 2nd external electrode 310, 410: Insertion part 320, 420: Extension part 330, 430: Pad section P:Protrusion O: Opening 500: Metal layer 1000, 2000: Coil parts

Claims

1. A body including a first surface and a second surface facing the first direction, and a third surface and a fourth surface facing the second direction perpendicular to the first direction, A coil disposed within the main body, including a first pull-out section extending to the first surface and a second pull-out section extending to the second surface, It includes a first external electrode connected to the first lead-out section, and a second external electrode connected to the second lead-out section, The first external electrode and the second external electrode each include an insertion portion which is at least partly disposed within the main body, an extension portion which is bent from the insertion portion and extends in the second direction, and a pad portion which is bent from the extension portion and extends in the third direction. A coil component in which the average length of the extension along the second direction is 0.5 times or less the average thickness of the main body along the second direction, and is inversely proportional to the mass of the coil component.

2. The coil component according to claim 1, wherein the average length of the extension along the second direction and the mass of the coil component satisfy the following mathematical formula. [Mathematical formula] [Math 11] (L Ｅ (E: average length of the extension, E: modulus of elasticity, f: natural frequency, A: cross-sectional area of ​​the extension, m: mass of the coil component)

3. The coil component according to claim 2, wherein the natural frequency f in the mathematical formula exceeds 0.2 MHz.

4. The coil component according to claim 1, wherein the insertion portion includes a protruding portion that protrudes in a third direction perpendicular to the first and second directions.

5. The coil component according to claim 1, wherein an opening is formed in at least a portion of the bending region between the insertion portion and the extension portion, and the bending region between the extension portion and the pad portion.

6. The coil component according to claim 1, wherein the first lead portion is disposed between the main body and the first external electrode, and the second lead portion is disposed between the main body and the second external electrode.

7. The coil component according to claim 6, further comprising a metal layer covering the first and second drawers.

8. The coil component according to claim 7, wherein the metal layer comprises at least one of Sn, Ni, and Cu.

9. The first and second surfaces are connected via the third surface. Recesses are formed in the region where the first surface and the third surface are connected, and in the region where the second surface and the third surface are connected. The coil component according to any one of claims 1 to 8, wherein the extension portion and the pad portion are arranged in the recess.

10. The coil component according to claim 9, wherein the first and second lead portions extend along the surface of the recess to the third surface.

11. The coil component according to claim 9, wherein at least one of the first and second drawer portions is separated from the pad portion.

12. A body including a first surface and a second surface facing the first direction, and a third surface and a fourth surface facing the second direction perpendicular to the first direction, A coil disposed within the main body, including a first pull-out section extending to the first surface and a second pull-out section extending to the second surface, It includes a first external electrode connected to the first lead-out section, and a second external electrode connected to the second lead-out section, The first external electrode and the second external electrode each include an insertion portion which is at least partly disposed within the main body, an extension portion which is bent from the insertion portion and extends in the second direction, and a pad portion which is bent from the extension portion and extends in the third direction. A coil component wherein the average length of the extension along the second direction is 0.5 times or less the average thickness of the main body along the second direction, and is proportional to the cross-sectional area of ​​the extension on a cross section perpendicular to the second direction.

13. The main body further includes a fifth and a sixth surface facing a third direction perpendicular to the first and second directions, The coil component according to claim 12, wherein the cross-sectional area of ​​the extension is defined as the product of the average thickness of the extension along the first direction and the average width along the third direction, on a cross section perpendicular to the second direction.

14. The coil component according to claim 12, wherein the average length of the extension along the second direction and the cross-sectional area of ​​the extension on a cross section perpendicular to the second direction satisfy the following mathematical formula. [Mathematical formula] [Math 12] (L Ｅ (E: average length of the extension, E: modulus of elasticity, f: natural frequency, A: cross-sectional area of ​​the extension, m: mass of the coil component)

15. The coil component according to claim 14, wherein the natural frequency f in the mathematical formula exceeds 0.2 MHz.

16. The coil component according to claim 12, wherein the first lead portion is disposed between the main body and the first external electrode, and the second lead portion is disposed between the main body and the second external electrode.

17. The material further includes a metal layer covering the first and second drawer sections, The coil component according to claim 16, wherein the metal layer comprises at least one of Sn, Ni, and Cu.

18. The first and second surfaces are connected via the third surface. Recesses are formed in the region where the first surface and the third surface are connected, and in the region where the second surface and the third surface are connected. The coil component according to any one of claims 12 to 17, wherein the extension portion and the pad portion are arranged in the recess.

19. The coil component according to claim 18, wherein the first and second lead portions each extend along the surface of the recess to the third surface.

20. The coil component according to claim 18, wherein at least one of the first pull-out portion and the second pull-out portion is separated from the pad portion.

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