Coil component

Abstract

The invention provides a coil assembly. The coil component includes: a body including a first surface and a second surface opposite to each other in a first direction and a third surface and a fourth surface opposite to each other in a second direction; a coil disposed in the main body; a first extraction electrode connected to an outer end of the coil and protruding to the first surface; a second extraction electrode connected to an inner end of the coil and protruding to the second surface; a first external electrode disposed on the third surface, extending to the first surface, and connected to the first extraction electrode; and a second external electrode disposed on the third surface, extending to the second surface, and connected to the second extraction electrode, in which a thickness of each of the first extraction electrode and the second extraction electrode in the second direction is smaller than a thickness of the coil in the second direction.

Description

[0001] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0126742 filed in the Korean Intellectual Property Office on September 22, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

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

[0003] An inductor, a type of coil component, may be a typical passive electronic component used in electronic devices along with resistors and capacitors.

[0004] As electronic devices have been designed to have high performance and reduced size, the number of electronic components used in the electronic devices has increased and the sizes of the electronic components used in the electronic devices have decreased.

[0005] There is a need for a coil assembly having a single-layer coil structure that can facilitate thinning of the coil and reduce magnetic flux losses due to misalignment of the coil. Summary of the invention

[0006] An aspect of the present disclosure is to provide a coil component that can increase a central core area and an effective volume and can reduce a loss of magnetic flux due to misalignment of a coil by applying a single-layer coil structure.

[0007] Another aspect of the present disclosure is to strengthen the bonding force between the extraction electrode and the external electrode and to reduce the DC resistance (R) by expanding the contact area between the extraction electrode and the external electrode. dc ).

[0008] According to one aspect of the present disclosure, a coil component includes: a main body, including a first surface and a second surface opposite to each other in a first direction and a third surface and a fourth surface opposite to each other in a second direction perpendicular to the first direction; a coil, arranged in the main body and forming at least one turn; a first lead-out electrode, connected to the outer end of the coil and extending to the first surface; a second lead-out electrode, connected to the inner end of the coil and extending to the second surface; a first external electrode, arranged on the third surface, extending to the first surface and connected to the first lead-out electrode; and a second external electrode, spaced apart from the first external electrode on the third surface, extending to the second surface and connected to the second lead-out electrode, wherein the thickness of each of the first lead-out electrode and the second lead-out electrode in the second direction is smaller than the thickness of the coil in the second direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other aspects, features and advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which:

[0010] Figure 1 is a perspective view showing a coil component according to a first embodiment of the present disclosure;

[0011] Figure 2 It is shown Figure 1 An exploded perspective view of the connection relationship between some components shown in FIG.

[0012] Figure 3 It is along Figure 1 A cross-sectional view taken along line II' in FIG.

[0013] Figure 4 It is along Figure 1 A cross-sectional view taken along line II-II';

[0014] Figure 5 FIG. 1 is a diagram showing a coil component according to a second embodiment of the present disclosure. Figure 3 The corresponding diagram;

[0015] Figure 6 FIG. 2 is a diagram showing a coil component according to a third embodiment of the present disclosure. Figure 5 a corresponding diagram; and

[0016] Figure 7 FIG. 2 is a diagram showing a coil component according to a fourth embodiment of the present disclosure. Figure 5 The corresponding diagram. DETAILED DESCRIPTION

[0017] Hereinafter, embodiments of the present disclosure will be described as follows with reference to the accompanying drawings.

[0018] However, the present disclosure can be illustrated in many different forms and should not be construed as being limited to the specific embodiments set forth herein. Unless the context has a significantly different meaning, the expression used in the singular encompasses the expression of the plural. The terms "comprise", "include", "constructed to", etc. of the specification are used to indicate the presence of features, quantities, steps, operations, elements, parts, or combinations thereof, and do not exclude the possibility of combining or adding one or more features, quantities, steps, operations, elements, parts, or combinations thereof. In addition, the expression that the element is set "on..." may indicate that the element may be set above or below the target portion, and does not necessarily indicate that the element is set above the target portion in the direction of gravity.

[0019] It will be understood that when an element is “coupled to” or “connected to” another element, the element may be directly coupled to or “coupled to” the other element, and there may be intervening elements between the element and the other element. Conversely, it will be understood that when an element is “directly coupled to” or “directly coupled to” or “directly connected to” another element, there are no intervening elements between the element and the other element.

[0020] The structures, shapes, and sizes described as examples in the embodiments in the present disclosure may be implemented in another exemplary embodiment without departing from the spirit and scope of the present disclosure.

[0021] In the drawings, L(1) may be defined as a first direction or a length direction, T(2) may be defined as a second direction or a thickness direction, and W(3) may be defined as a third direction or a width direction.

[0022] In the accompanying drawings, the same elements will be denoted by the same reference numerals. In addition, detailed descriptions and redundant descriptions of known functions and elements that may unnecessarily obscure the gist of the present disclosure will not be provided.

[0023] Various types of electronic components are used in electronic devices, and various types of coil components may be appropriately used between these electronic components for the purpose of removing noise.

[0024] That is, in electronic devices, the coil assembly can be used as a power inductor, a high-frequency (HF) inductor, a general magnetic bead, a high-frequency magnetic bead (for example, a magnetic bead suitable for a GHz frequency band), a common mode filter, etc.

[0025] First embodiment

[0026] Figure 1 is a perspective view showing a coil component 1000 according to the first embodiment. Figure 2 It is shown Figure 1 An exploded perspective view of the connection relationship between some components shown in FIG. Figure 3 It is along Figure 1 A cross-sectional view taken along line II' in FIG. Figure 4 It is along Figure 1 A cross-sectional view taken along line II-II'.

[0027] exist Figure 1 , the insulating layer 600 applied on the body 100 of the embodiment will not be shown to allow a coupling relationship between components to be clearly represented.

[0028] Reference Figures 1 to 4The coil component 1000 according to the first embodiment may include a body 100 , a coil 300 , lead electrodes 410 and 420 , and external electrodes 510 and 520 , and may further include an insulating layer 600 covering the body 100 .

[0029] The coil component 1000 according to the embodiment may include the coil 300 provided as a single layer in the body 100 , and may include plate-shaped lead-out electrodes 410 and 420 connecting the coil 300 to the external electrodes 510 and 520 .

[0030] In addition, the extraction electrodes 410 and 420 may further include bent portions 411 and 421 located in the end regions and in contact with the external electrodes 510 and 520 (see Figure 5 ), and the bent portions 411 and 421 may be bent upward or downward along the inner side surface of at least one of the external electrodes 510 and 520, thereby enhancing the connection reliability and the bonding force between the lead-out electrodes 410 and 420 and the external electrodes 510 and 520. Here, the bent portions 411 and 421 may be in direct contact with the inner side surface of at least one of the external electrodes 510 and 520.

[0031] Since the coil component 1000 according to the embodiment does not include a support member such as a copper clad laminate (CCL) for supporting the coil 300, it can be advantageous to thin the coil component 1000 and secure a space where a magnetic material is to be disposed within a limited size, thereby improving inductance.

[0032] Furthermore, since the coil 300 is formed as a single layer, magnetic flux loss due to asymmetry or misalignment between the upper coil and the lower coil may be prevented compared to an example including two or more layers of coils.

[0033] In the following description, main components included in the coil component 1000 according to the embodiment will be described in more detail.

[0034] In an embodiment, the body 100 may form an outer shape of the coil component 1000 , and the coil 300 may be disposed in the body 100 .

[0035] The body 100 may have a hexahedral shape.

[0036] The body 100 may include a first surface 101 and a second surface 102 opposite to each other in a length direction (L), a third surface 103 and a fourth surface 104 opposite to each other in a thickness direction (T), and a fifth surface 105 and a sixth surface 106 opposite to each other in a width direction (W). Each of the first surface 101, the second surface 102, the fifth surface 105, and the sixth surface 106 of the body 100 may be a wall surface of the body 100 connecting the third surface 103 and the fourth surface 104 of the body 100.

[0037] The coil component 1000 formed with the external electrodes 510 and 520 may have a length of 2.5 mm, a width of 2.0 mm, and a thickness of 0.8 mm, a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.6 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.6 mm, a length of 2.0 mm, a width of 1.2 mm, and a thickness of 1.0 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.4 mm, a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm, a length of 1.0 mm, a width of 0.7 mm, and a thickness of 0.65 mm, a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.65 mm, or a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.5 mm, but embodiments thereof are not limited thereto. Since the above exemplary dimensions of the length, width, and thickness of the coil component 1000 may refer to dimensions that do not reflect process errors, dimensions within a range identified as process errors may correspond to the above exemplary dimensions.

[0038] The length of the coil assembly 1000 may be: based on an optical microscope image or a scanning electron microscope (SEM) image of a cross section in the length direction-thickness direction taken from the central portion of the coil assembly 1000 in the width direction, the maximum value among the sizes of the multiple line segments of the coil assembly 1000 that are connected to each other and parallel to the length direction. Optionally, the length of the coil assembly 1000 may refer to the minimum value among the sizes of the multiple line segments. Optionally, the length of the coil assembly 1000 may refer to the arithmetic mean of three or more of the sizes of the multiple line segments. Here, the multiple line segments parallel to the length direction may be spaced apart from each other by equal distances in the thickness direction, but embodiments thereof are not limited thereto.

[0039] The thickness of the coil component 1000 may be: based on an optical microscope image or a scanning electron microscope (SEM) image of a cross section in the length direction-thickness direction taken from the central portion of the coil component 1000 in the width direction, the two outermost boundary lines of the coil component 1000 that are opposite to each other in the thickness direction are connected to each other and the maximum value among the sizes of multiple line segments parallel to the thickness direction. Optionally, the thickness of the coil component 1000 may refer to the minimum value among the sizes of the multiple line segments. Optionally, the thickness of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the multiple line segments. Here, the multiple line segments parallel to the thickness direction may be spaced apart from each other by equal distances in the length direction, but embodiments thereof are not limited thereto.

[0040] The width of the coil component 1000 may be: based on an optical microscope image or a scanning electron microscope (SEM) image of a cross section in the length direction-width direction taken from the central portion of the coil component 1000 in the thickness direction, the maximum value among the sizes of the multiple line segments of the coil component 1000 that are connected to each other and parallel to the width direction and that are two outermost boundary lines that are opposite to each other in the width direction. Optionally, the width of the coil component 1000 may refer to the minimum value among the sizes of the multiple line segments. Optionally, the width of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the multiple line segments. Here, the multiple line segments parallel to the width direction may be spaced apart from each other by equal distances in the length direction, but embodiments thereof are not limited thereto.

[0041] Optionally, each of the length, width and thickness of the coil assembly 1000 can be measured by a micrometer measurement method. The micrometer measurement method can be performed in the following manner: determine the zero point with a micrometer with metrological repeatability and reproducibility (R&R), insert the coil assembly 1000 in the embodiment between the tips of the micrometer, and measure by rotating the measuring rod of the micrometer. When measuring the length of the coil assembly 1000 by the micrometer measurement method, the length of the coil assembly 1000 can refer to a value measured once, or can refer to the arithmetic mean of the values ​​measured multiple times, which can also be applied to the width and thickness of the coil assembly 1000.

[0042] The main body 100 may include a magnetic material and a resin. Specifically, the main body 100 may be formed by laminating one or more magnetic composite sheets in which a magnetic material is dispersed in an insulating resin. The main body 100 may have a structure other than a structure in which a magnetic material is dispersed in an insulating resin. For example, the main body 100 may be formed using a magnetic material such as ferrite.

[0043] The magnetic material can be ferrite powder or metal magnetic powder.

[0044] The ferrite powder can be, for example, at least one of spinel ferrite (such as Mg-Zn-based ferrite, Mn-Zn-based ferrite, Mn-Mg-based ferrite, Cu-Zn-based ferrite, Mg-Mn-Sr-based ferrite, Ni-Zn-based ferrite), hexagonal ferrite (such as Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite, Ba-Ni-Co-based ferrite), garnet-type ferrite (such as Y-based ferrite) and Li-based ferrite.

[0045] The metal magnetic powder may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu) and nickel (Ni). For example, the metal magnetic powder may be at least one of pure iron powder, Fe-Si-based alloy powder, Fe-Si-Al-based alloy powder, Fe-Ni-based alloy powder, Fe-Ni-Mo-based alloy powder, Fe-Ni-Mo-Cu-based alloy powder, Fe-Co-based alloy powder, Fe-Ni-Co-based alloy powder, Fe-Cr-based alloy powder, Fe-Cr-Si-based alloy powder, Fe-Si-Cu-Nb-based alloy powder, Fe-Ni-Cr-based alloy powder and Fe-Cr-Al-based alloy powder.

[0046] The metal magnetic powder may be amorphous or crystalline. For example, the metal magnetic powder may be Fe-Si-B-Cr based amorphous alloy powder, but the embodiment is not limited thereto.

[0047] Each of the ferrite powder and the metal magnetic powder may have an average diameter of about 0.1 μm to about 30 μm, but the embodiment is not limited thereto.

[0048] The body 100 may include two or more types of magnetic materials dispersed in the resin. Here, different types of magnetic materials may mean that the magnetic materials dispersed in the resin can be distinguished from each other by at least one of average diameter, composition, crystallinity, and shape.

[0049] The resin may include epoxy resin, polyimide, liquid crystal polymer, etc., alone or in combination, but the embodiment is not limited thereto.

[0050] Reference Figure 3 and Figure 4 , the body 100 may include a core 110 disposed in a central region of the coil 300. The core 110 may be formed by filling the central region of the coil 300 with a magnetic composite sheet, but the embodiment is not limited thereto.

[0051] The coil 300 may be embedded in the body 100 and may exhibit characteristics of the coil component 1000. For example, when the coil component 1000 according to the embodiment is used as a power inductor, the coil 300 may be used to stabilize power of an electronic device by storing an electric field as a magnetic field and maintaining an output voltage.

[0052] When the coil is formed by plating, generally, the coil patterns may be respectively arranged on the two surfaces of the board and may be connected to each other through vias. However, in this structure, an area in which the upper coil pattern and the lower coil pattern do not overlap each other may be formed. Therefore, a loss of magnetic flux may occur around the coil, and an area in which the core area of ​​the upper coil pattern and the core area of ​​the lower coil pattern overlap each other may become the entire core area of ​​the coil assembly, thereby possibly reducing the area of ​​the entire core area.

[0053] Unlike the above-described example, in the coil component 1000 according to the embodiment, the coil 300 may be formed in a single layer, so that the above-described loss of magnetic flux may be prevented and the area of ​​the core 110 may also be increased.

[0054] Reference Figures 1 to 4 The coil 300 may form at least one turn around the core 110 and may have a planar spiral shape, but the embodiment is not limited thereto, and the coil 300 may also have an angled shape.

[0055] Reference Figure 1 , Figure 2 and Figure 3 , the coil 300 may be disposed in the body 100 to be spaced apart from the surface of the body 100. That is, the coil 300 may be disposed to be spaced apart from the fourth surface 104, the fifth surface 105, and the sixth surface 106 of the body 100 and the first surface 101, the second surface 102, and the third surface 103 of the body 100 on which the external electrodes 510 and 520 are disposed.

[0056] Therefore, the coil 300 may not be directly connected to the external electrodes 510 and 520 , but may be electrically connected to the external electrodes 510 and 520 through the lead-out electrodes 410 and 420 .

[0057] Reference Figure 2 and Figure 3 , the outer end 310 of the coil 300 may be connected to the first lead-out electrode 410 , and the inner end 320 of the coil 300 may be connected to the second lead-out electrode 420 .

[0058] Specifically, the outer end 310 of the coil 300 (i.e., the end of the outermost turn) can be connected to the first lead-out electrode 410 through the first via V1, and the inner end 320 of the coil 300 (i.e., the end of the innermost turn) can be connected to the second lead-out electrode 420 through the second via V2.

[0059] Reference Figures 1 to 3 , the coil component 1000 according to the embodiment may include lead-out electrodes 410 and 420 .

[0060] The lead electrodes 410 and 420 may be components for connecting the single-layer coil 300 to the external electrodes 510 and 520, and in order to reduce the thickness of the coil component 1000, the lead electrodes 410 and 420 may have a thickness of Figures 1 to 3 The thin plate shape shown in .

[0061] Reference Figure 3 and Figure 4 , the thickness T of each of the first extraction electrode 410 and the second extraction electrode 420 in the second direction L The thickness T of the comparable coil 300 in the second direction C Small.

[0062] As an example, the thickness T of the extraction electrodes 410 and 420 in the embodiment is L The thickness T of the lead-out electrodes 410 and 420 may be greater than or equal to 10 μm and less than or equal to 30 μm, but the embodiment is not limited thereto. L The thickness T of the main body 100 may be B The invention relates to a method for preparing an optically conductive film having an optically conductive film and an optically conductive film. The optically conductive film has an optically conductive film of 2.7% to 8.0%, but the embodiment is not limited thereto.

[0063] When the thickness T of the extraction electrodes 410 and 420 is L Less than 10 μm or less than the thickness T of the main body 100 B 2.7%, the connection reliability between the coil 300 and the external electrodes 510 and 520 may be reduced. In addition, when the thickness T of the lead-out electrodes 410 and 420 is L More than 30 μm or more than the thickness T of the main body 100 B When the saturation current I sat Properties may be degraded by 10% or more.

[0064] Here, the thickness T of the extraction electrodes 410 and 420 is L It may refer to: based on an optical microscope image or a scanning electron microscope (SEM) image of the LT cross section of the coil component 1000 taken from the center of the coil component 1000 in the third direction, the arithmetic mean of at least three dimensions of the boundary between the two outermost sides of the lead-out electrodes 410 and 420 opposite to each other in the second direction connected in the above image, and the dimensions of a plurality of line segments parallel to the second direction and spaced apart from each other in the first direction. Here, the plurality of line segments parallel to the second direction may be spaced apart from each other by equal distances in the first direction, but embodiments thereof are not limited thereto.

[0065] The thickness T of the coil 300 C and the thickness T of the main body 100 B It can also be measured by the above method.

[0066] Reference Figure 2 and Figure 3 , the vias V1 and V2 may be components connecting the coil 300 to the lead-out electrodes 410 and 420 .

[0067] Specifically, the coil component 1000 according to the embodiment may include a first via hole V1 connecting the outer end 310 of the coil 300 to the first lead-out electrode 410 and a second via hole V2 connecting the inner end 320 of the coil 300 to the second lead-out electrode 420 .

[0068] The first and second via holes V1 and V2 may penetrate the first insulating film IF1 covering the lead-out electrodes 410 and 420 .

[0069] Through the above components, a signal input to the first external electrode 510 may pass through the first lead-out electrode 410, the first via hole V1, the coil 300, the second via hole V2, and the second lead-out electrode 420 and may be output to the second external electrode 520. Therefore, the first lead-out electrode 410, the first via hole V1, the coil 300, the second via hole V2, and the second lead-out electrode 420 may function as a single coil connected between the first external electrode 510 and the second external electrode 520 as a whole.

[0070] Reference Figure 4 , the coil 300 may include one surface opposite to the third surface 103 of the body 100 and another surface opposite to the fourth surface 104 of the body 100, and the surface roughness R of one surface of the coil 300 is L The surface roughness R of the other surface of the comparable coil 300 is U big.

[0071] After the coil 300 is formed by plating on a support member such as a CCL board, the roughness of one surface of the coil 300 may be large in a process of physically or chemically removing the support member of one surface of the coil 300. However, embodiments thereof are not limited thereto, and when a polishing process is applied to one surface of the coil 300, a difference in surface roughness between one surface and another surface of the coil 300 may not be observed.

[0072] In the embodiment, the coil 300 may have a surface roughness R L Increased and having increased bonding force with the second insulating film IF2.

[0073] In an embodiment, the surface roughness may refer to the arithmetic mean roughness R a, and may be a value measured by using an optical surface profiler (such as Zygo's 7300 optical surface profiler) or using Mitutoyo's surface roughness measuring device SV-3200. The above surface roughness may correspond to the arithmetic mean of the values ​​measured in the second direction for a WT cross section passing through the center of one surface or the other surface of the coil 300.

[0074] At least one of the coil 300, the vias V1 and V2, and the lead-out electrodes 410 and 420 may include one or more conductive layers. For example, when the coil 300 and the vias V1 and V2 are formed by plating on a support member such as a CCL board, each of the coil 300 and the vias V1 and V2 may include a first conductive layer formed by electroless plating and a second conductive layer disposed on the first conductive layer.

[0075] The first conductive layer may be a seed layer for forming a second conductive layer by plating on a support member such as a CCL board, and the second conductive layer may be an electroplating layer. Here, the electroplating layer may have a single-layer structure or a multi-layer structure. The electroplating layer having a multi-layer structure may be formed into a conformal film structure in which one electroplating layer is covered by another electroplating layer, or may be formed into a shape in which another electroplating layer is laminated only on one surface of one electroplating layer. The seed layer of the coil 300 may be formed integrally with the seed layer of the vias V1 and V2 so that no boundary may be formed between them, but embodiments thereof are not limited thereto. The electroplating layer of the coil 300 may be formed integrally with the electroplating layer of the vias V1 and V2 so that no boundary may be formed between them, but embodiments thereof are not limited thereto.

[0076] Each of the coil 300, the vias V1 and V2, and the lead electrodes 410 and 420 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof, but embodiments thereof are not limited thereto.

[0077] Reference Figure 3 and Figure 4 , the coil component 1000 according to the embodiment may further include insulating films IF1 and IF2 in the body 100 .

[0078] In an embodiment, the insulating films IF1 and IF2 may be components covering the coil 300 and the lead-out electrodes 410 and 420. The insulating films IF1 and IF2 may insulate the coil 300 from the lead-out electrodes 410 and 420 in the region except for the vias V1 and V2, and may insulate the coil 300 and the lead-out electrodes 410 and 420 from the body 100.

[0079] Reference Figure 3, the first insulating film IF1 in the embodiment may be disposed between the first lead-out electrode 410 and the coil 300 , and may insulate the first lead-out electrode 410 and the coil 300 from each other.

[0080] In addition, the first insulating film IF1 may be provided between the second lead-out electrode 420 and the coil 300 , and may insulate the second lead-out electrode 420 and the coil 300 from each other.

[0081] The coil component 1000 according to the embodiment may further include a second insulating film IF2 covering at least a portion of the coil 300 and at least a portion of the lead-out electrodes 410 and 420 .

[0082] An interface surface may be formed between the first insulating film IF1 and the second insulating film IF2 in the embodiment according to a process sequence, but the embodiment is not limited thereto, and the first insulating film IF1 and the second insulating film IF2 may be integrated with each other and may not form the interface surface.

[0083] The first insulating film IF1 and the second insulating film IF2 may be formed using a thermosetting insulating resin such as epoxy resin, a thermoplastic insulating resin such as polyimide, or an insulating material including a photosensitive insulating resin, or an insulating material formed by impregnating a reinforcing material in an insulating resin.

[0084] As a non-limiting example, the insulating films IF1 and IF2 may be formed using a film-type insulating material such as a prepreg, an Ajinomoto build-up film (ABF), and a photosensitive dielectric (PID) film, but the embodiment is not limited thereto, and the insulating films IF1 and IF2 may be formed by coating a liquid insulating resin and curing the resin. Alternatively, the insulating films IF1 and IF2 may include a commonly used insulating material such as polyparaxylene or polyimide, and may also be formed by a method such as a vapor deposition method.

[0085] Reference Figure 1 and Figure 3 , the external electrodes 510 and 520 may be disposed on the body 100 and may be connected to the lead-out electrodes 410 and 420 .

[0086] Specifically, the first external electrode 510 may be disposed on the third surface 103 of the body 100, may extend to the first surface 101 of the body 100, and may be connected to the first extraction electrode 410. In addition, the second external electrode 520 may be disposed on the third surface 103 of the body 100, may extend to the second surface 102 of the body 100, and may be connected to the second extraction electrode 420. The first external electrode 510 and the second external electrode 520 may be spaced apart from each other on the third surface 103 of the body 100.

[0087] The first external electrode 510 may include: a connection portion provided on the first surface 101 of the body 100 and connected to the first extraction electrode 410; and a pad portion extending from the connection portion to the third surface 103 of the body 100. In addition, the second external electrode 520 may include: a connection portion provided on the second surface 102 of the body 100 and connected to the second extraction electrode 420; and a pad portion extending from the connection portion to the third surface 103 of the body 100.

[0088] The connection part and the pad part may be integrated with each other, but the embodiment is not limited thereto.

[0089] The pad portions of the external electrodes 510 and 520 may be components that contact a connection member such as solder when the coil component 1000 is mounted on a circuit board, and may protrude beyond the insulating layer 600 along the second direction on the third surface 103 of the body 100. Figure 3 When the coil component 1000 is mounted, the contact area with the connecting member such as solder can be increased, thereby enhancing the adhesion strength with the connecting member, and the distance from the circuit board can be increased, so that the risk of short circuit can be reduced.

[0090] The external electrodes 510 and 520 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or an alloy thereof, but embodiments thereof are not limited thereto.

[0091] Reference Figures 1 to 3 The external electrodes 510 and 520 may be formed in a multi-layer structure. For example, the first layers 511 and 521 through which the external electrodes 510 and 520 are connected to the lead electrodes 410 and 420 may be copper (Cu) plated layers or conductive resin layers including at least one of copper (Cu) and silver (Ag).

[0092] Here, when the first layers 511 and 521 of the external electrodes 510 and 520 are formed using a conductive resin layer, the first layers 511 and 521 may include a resin and a metal dispersed in the resin, and the resin may be a thermosetting resin that may include an epoxy resin and the metal may include at least one of silver (Ag) and copper (Cu). For example, the conductive resin layer may be an Ag-epoxy layer or a Cu-epoxy layer, and may be formed by coating a conductive paste including at least one of silver (Ag) and copper (Cu) and curing the conductive paste, but embodiments are not limited thereto.

[0093] In the external electrodes 510 and 520 in the embodiment, second layers 512 and 522 may be additionally provided to cover the area of ​​the first layers 511 and 521 provided on the third surface 103 of the body 100. That is, when the coil component 1000 is mounted on a circuit board, the second layers 512 and 522 may be included in the pad portion that directly contacts the solder.

[0094] The second layers 512 and 522 of the external electrodes 510 and 520 may have a double-layered structure of a nickel (Ni) plated layer and a tin (Sn) plated layer.

[0095] The first layers 511 and 521 of the external electrodes 510 and 520 may be formed by electroplating, vapor deposition such as sputtering, or by coating a conductive paste including a conductive powder such as copper (Cu) and / or silver (Ag) and curing the conductive paste, and the second layers 512 and 522 may be formed by electroplating.

[0096] Reference Figure 3 and Figure 4 The coil component 1000 according to the embodiment may further include an insulating layer 600 disposed on the body 100 and exposing the external electrodes 510 and 520 .

[0097] The insulating layer 600 may be disposed to cover the third surface 103, the fourth surface 104, the fifth surface 105, and the sixth surface 106 of the body 100, and may be disposed in a region between the first external electrode 510 and the second external electrode 520 on the third surface 103 of the body 100, and may expose the first external electrode 510 and the second external electrode 520.

[0098] The insulating layer 600 in the embodiment may be formed to have a thickness smaller than that of the external electrodes 510 and 520, and in this case, the external electrodes 510 and 520 may have a shape that partially protrudes toward the mounting surface. For example, the outer side surfaces of the second layers 512 and 522 of the external electrodes 510 and 520 may protrude beyond the outer side surface of the insulating layer 600 in the second direction.

[0099] When the external electrodes 510 and 520 are configured to protrude beyond the insulating layer 600 in the second direction, when the coil component 1000 is installed, the contact area with the connecting member such as solder can be increased, so that the adhesion strength with the connecting member can be strengthened, and the distance from the circuit board can also be increased, thereby reducing the risk of short circuit.

[0100] For example, the insulating layer 600 may be formed by applying an insulating material including an insulating resin to the surface of the body 100 and curing it. In this case, the insulating layer 600 may include at least one of a thermoplastic resin (such as polystyrene resin, vinyl acetate resin, polyester resin, polyethylene resin, polypropylene resin, polyamide resin, rubber resin, and acrylic resin), a thermosetting resin (such as phenolic resin, epoxy resin, polyurethane resin, melamine resin, alkyd resin, etc.), and a photosensitive resin.

[0101] Second embodiment

[0102] Figure 5 FIG. 2 is a diagram showing a coil component 2000 according to a second embodiment. Figure 3 The corresponding diagram.

[0103] Will Figure 5 and Figure 3 In contrast, the configuration in which the lead-out electrodes 410 and 420 include the bent portions 411 and 421 may be different.

[0104] Therefore, when describing the embodiment, only the bent portions 411 and 421 included in the extraction electrodes 410 and 420, which are different from the first embodiment, will be described. The description in the first embodiment can be applied to other components in the present embodiment.

[0105] Reference Figure 5 , the bent portions 411 and 421 in the embodiment may be formed in a region where the lead electrodes 410 and 420 extend from the body 100 .

[0106] The bent portions 411 and 421 in the embodiment may be arranged to be bent toward the fourth surface 104 of the body 100. Specifically, the extraction electrodes 410 and 420 may be formed to be parallel to the first direction and may include bent portions 411 and 421 bent along the second direction to point to the fourth surface 104 of the body 100 in regions adjacent to the first surface 101 and the second surface 102 of the body 100, respectively.

[0107] The bent portions 411 and 421 in the embodiment may extend along inner side surfaces of the external electrodes 510 and 520 in the second direction toward the fourth surface 104 of the body 100 .

[0108] Specifically, the first bent portion 411 may be formed on an end of the first extraction electrode 410 contacting the first surface 101 of the body 100 , and may extend along an inner side surface of the first external electrode 510 in the second direction toward the fourth surface 104 of the body 100 .

[0109] In addition, the second bent portion 421 may be formed on an end portion of the second extraction electrode 420 contacting the second surface 102 of the body 100 and may extend along an inner side surface of the second external electrode 520 in the second direction toward the fourth surface 104 of the body 100 .

[0110] The thickness T1 of the bent portions 411 and 421 extending in the second direction in the first direction may be greater than the thickness T1 of the extraction electrodes 410 and 420 parallel to the first direction in the second direction. L The embodiment is large, but the embodiment is not limited thereto.

[0111] The length L1 of the bent portions 411 and 421 of the embodiment may be, for example, greater than or equal to 30 μm and less than or equal to 110 μm, but the embodiment is not limited thereto. In addition, the length L1 of the bent portions 411 and 421 may be equal to the thickness T of the body 100. B 8.0% to 29.3%, but the embodiment is not limited thereto.

[0112] When the length L1 of the bent portions 411 and 421 is less than 30 μm or less than the thickness T of the body 100 B When the length L1 of the bent portions 411 and 421 exceeds 110 μm or exceeds the thickness T of the body 100, the connection reliability between the coil 300 and the external electrodes 510 and 520 may be reduced. B When the inductance Ls characteristic is 29.3%, the inductance Ls characteristic may be degraded by 10% or more.

[0113] Here, the length L1 of the bent portions 411 and 421 may refer to: based on an optical microscope image or a scanning electron microscope (SEM) image of the LT cross section of the coil component 1000 taken from the center of the coil component 1000 in the third direction, the arithmetic mean of at least three dimensions of the boundary between the two outermost sides of the bent portions 411 and 421 opposite to each other in the second direction connected in the above image, and the dimensions of a plurality of line segments parallel to the second direction and spaced apart from each other in the first direction. Here, the plurality of line segments parallel to the second direction may be spaced apart from each other by equal distances in the first direction, but embodiments thereof are not limited thereto.

[0114] Since the bent portions 411 and 421 in the embodiment are components of the lead electrodes 410 and 420, the bent portions 411 and 421 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof.

[0115] The bent portions 411 and 421 in the embodiment may be formed by forming regions aligned with the extraction electrodes 410 and 420 in the first direction, providing a dam mask for exposing the region where the bent portions 411 and 421 are provided, and performing electroplating, but the embodiment is not limited thereto.

[0116] In the coil component 2000 according to the embodiment, the contact area between the lead electrodes 410 and 420 and the external electrodes 510 and 520 can be increased by the bent portions 411 and 421, and the connection reliability and bonding force between the lead electrodes 410 and 420 and the external electrodes 510 and 520 can be enhanced, and the DC resistance (R dc ).

[0117] Third embodiment

[0118] Figure 6 FIG. 1 is a diagram showing a coil assembly 3000 according to a third embodiment. Figure 5 The corresponding diagram.

[0119] Will Figure 6 and Figure 5 In contrast, the bending directions and shapes of the bent portions 411 and 421 included in the lead-out electrodes 410 and 420 may be different.

[0120] Therefore, when describing the embodiment, only the bending directions and shapes of the bending portions 411 and 421 that are different from those of the second embodiment will be described. The description in the second embodiment can be applied to other components in this embodiment.

[0121] Reference Figure 6 , the bent portions 411 and 421 in the embodiment may be provided in a bent shape bent toward the third surface 103 of the body 100. Specifically, the extraction electrodes 410 and 420 may be formed to be parallel to the first direction and may include the bent portions 411 and 421 bent toward the third surface 103 of the body 100 along the second direction in the region adjacent to the first surface 101 and the second surface 102 of the body 100.

[0122] The bent portions 411 and 421 in the embodiment may extend along inner side surfaces of the external electrodes 510 and 520 in the second direction toward the third surface 103 of the body 100 .

[0123] Specifically, the first bent portion 411 may be formed on an end of the first extraction electrode 410 contacting the first surface 101 of the body 100 , and may extend along an inner side surface of the first external electrode 510 in the second direction toward the third surface 103 of the body 100 .

[0124] In addition, the second bent portion 421 may be formed on an end portion of the second extraction electrode 420 contacting the second surface 102 of the body 100 and may extend along an inner side surface of the second external electrode 520 in the second direction toward the third surface 103 of the body 100 .

[0125] The thickness T2 of the bent portions 411 and 421 extending in the second direction in the first direction may be greater than the thickness T2 of the extraction electrodes 410 and 420 parallel to the first direction in the second direction. L The embodiment is large, but the embodiment is not limited thereto.

[0126] The length L2 of the bent portions 411 and 421 in the embodiment may be, for example, greater than or equal to 30 μm and less than or equal to 110 μm, but the embodiment is not limited thereto. In addition, the length L2 of the bent portions 411 and 421 may be equal to the thickness T of the body 100. B 8.0% to 29.3%, but the embodiment is not limited thereto.

[0127] When the length L2 of the bent portions 411 and 421 is less than 30 μm or less than the thickness T of the body 100 B When the length L2 of the bent portions 411 and 421 exceeds 110 μm or exceeds the thickness T of the body 100, the connection reliability between the coil 300 and the external electrodes 510 and 520 may be reduced. B When the inductance Ls characteristic is 29.3%, the inductance Ls characteristic may be degraded by 10% or more.

[0128] Here, the length L2 of the bent portions 411 and 421 may refer to: an optical microscope image or a scanning electron microscope (SEM) image of the LT cross section of the coil component 1000 taken from the center of the coil component 1000 in the third direction, connecting the boundaries between the two outermost sides of the bent portions 411 and 421 in the above image that are opposite to each other in the second direction, and the arithmetic mean of at least three dimensions of the dimensions of a plurality of line segments that are parallel to the second direction and spaced apart from each other in the first direction. Here, the plurality of line segments that are parallel to the second direction may be spaced apart from each other by equal distances in the first direction, but embodiments thereof are not limited thereto.

[0129] In the coil component 3000 according to the embodiment, the bent portions 411 and 421 may be bent toward the external electrodes 510 and 520 disposed on the third surface 103 of the body 100, so that the effect of partially shielding the area between the coil 300 and the mounting surface is reduced at the saturation current I sat The characteristic aspects can be advantageous.

[0130] Fourth embodiment

[0131] Figure 7FIG. 1 is a diagram showing a coil component according to a fourth embodiment. Figure 5 The corresponding diagram.

[0132] Will Figure 7 and Figure 5 In contrast, the bending directions and shapes of the bent portions 411 and 421 included in the lead-out electrodes 410 and 420 may be different.

[0133] Therefore, when describing the embodiment, only the bending directions and shapes of the bending portions 411 and 421 that are different from those of the second embodiment will be described. The description in the second embodiment can be applied to other components in this embodiment.

[0134] Reference Figure 7 , the bent portions 411 and 421 in the embodiment may extend in the second direction toward the third surface 103 and the fourth surface 104 of the body 100 .

[0135] Specifically, the extraction electrodes 410 and 420 may be formed parallel to the first direction and may include bent portions 411 and 421 extending along the second direction toward the third and fourth surfaces 103 and 104 of the body 100 in regions adjacent to the first and second surfaces 101 and 102 of the body 100 , respectively.

[0136] The bent portions 411 and 421 in the embodiment may extend along the inner side surfaces of the external electrodes 510 and 520 in the second direction toward the third surface 103 and the fourth surface 104 of the body 100, respectively. That is, the bent portions 411 and 421 in the embodiment may extend in two directions.

[0137] Specifically, the first bent portion 411 may be formed at an end of the first lead electrode 410 contacting the first surface 101 of the body 100 and may extend along the inner surface of the first external electrode 510 in the second direction toward the third surface 103 and the fourth surface 104 of the body 100 .

[0138] In addition, the second bent portion 421 may be formed on the end of the second lead electrode 420 contacting the second surface 102 of the body 100 and may extend along the inner side surface of the second external electrode 520 in the second direction toward the third surface 103 and the fourth surface 104 of the body 100 respectively.

[0139] Since the bent portions 411 and 421 in the embodiment extend in two directions, the length L3 of the bent portions 411 and 421 in the embodiment may be longer than the lengths L1 and L2 of the bent portions 411 and 421 in the second and third embodiments.

[0140] In the coil component 4000 according to the embodiment, the bends 411 and 421 can extend in two directions and the length L3 of the bends 411 and 421 can be formed to be relatively long, thereby increasing the contact area with the external electrodes 510 and 520, so that the connection reliability and bonding force between the coil 300 and the external electrodes 510 and 520 can be enhanced.

[0141] In addition, a portion of the area of ​​the bent portions 411 and 421 may extend toward the mounting surface and may have the effect of partially shielding the area between the coil 300 and the mounting surface, which may be reduced at the saturation current I sat The characteristic aspects can be advantageous.

[0142] According to the aforementioned embodiments, by applying a single-layer coil structure to a thin film coil component, a central core area and an effective volume may be increased, and a magnetic flux loss due to misalignment of the coil may be reduced.

[0143] According to another aspect, by enlarging the contact area between the extraction electrode and the external electrode, the bonding force between the extraction electrode and the external electrode can be strengthened, and a device with reduced R dc Coil assembly.

[0144] While embodiments have been shown and described above, it will be readily apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: A body including a first surface and a second surface opposite to each other in a first direction and a third surface and a fourth surface opposite to each other in a second direction perpendicular to the first direction; a coil disposed in the body and comprising at least one turn; a first lead-out electrode connected to an outer end of the coil and extending to the first surface; a second lead-out electrode connected to an inner end of the coil and extending to the second surface; a first external electrode disposed on the third surface, extending onto the first surface and connected to the first lead-out electrode; as well as a second external electrode, spaced apart from the first external electrode on the third surface, extending onto the second surface and connected to the second lead-out electrode, The thickness of each of the first lead-out electrode and the second lead-out electrode in the second direction is smaller than the thickness of the coil in the second direction.

2. The coil assembly according to claim 1, wherein: At least one of the first lead-out electrode and the second lead-out electrode includes a bent portion formed at a region protruding from the body.

3. The coil assembly according to claim 2, wherein: The bent portion is bent toward the fourth surface.

4. The coil assembly according to claim 2, wherein: The bent portion is bent toward the third surface.

5. The coil assembly according to claim 2, wherein: The bent portion extends in the second direction toward the third surface and the fourth surface.

6. The coil assembly according to claim 2, wherein: The bent portion extends in the second direction along an inner side surface of a corresponding one of the first and second external electrodes.

7. The coil assembly according to claim 6, wherein: The thickness of the bent portion in the first direction is greater than the thickness of the at least one of the first lead-out electrode and the second lead-out electrode in the second direction.

8. The coil assembly according to claim 1, in, The first lead electrode and the second lead electrode are covered by a first insulating film, and The first insulating film is provided between the first lead-out electrode and the coil and between the second lead-out electrode and the coil.

9. The coil assembly according to claim 8, further comprising: a first via hole, connecting the outer end of the coil to the first lead-out electrode; as well as A second via hole connects the inner end of the coil to the second lead-out electrode.

10. The coil assembly according to claim 9, wherein: The first via hole and the second via hole penetrate the first insulating film.

11. The coil assembly according to claim 8, further comprising: The second insulating film covers at least a portion of the coil and at least a portion of the first lead-out electrode and the second lead-out electrode.

12. The coil assembly according to claim 11, wherein: The first insulating film and the second insulating film are integrated with each other.

13. The coil assembly according to claim 1, in, The coil includes one surface opposite to the third surface and another surface opposite to the fourth surface, and The surface roughness of the one surface is greater than the surface roughness of the other surface.

14. The coil assembly according to claim 2, wherein: A length of the bent portion in the second direction is greater than or equal to 30 μm and less than or equal to 110 μm.

15. The coil assembly according to claim 2, wherein: The length of the bent portion in the second direction is 8.0% to 29.3% of the thickness of the body in the second direction.

16. The coil assembly according to claim 6, wherein: The bent portion directly contacts the inner side surface of the corresponding one of the first and second external electrodes.

17. The coil assembly according to claim 1, wherein: The body further includes a fifth surface and a sixth surface facing each other in a third direction perpendicular to the first direction and the second direction, an insulating layer is provided to cover the fourth surface, the fifth surface, and the sixth surface of the body, and is provided to cover a portion of the third surface between the first external electrode and the second external electrode on the third surface of the body to expose the first external electrode and the second external electrode, and The first and second external electrodes protrude in the second direction beyond an outer side surface of the insulating layer disposed on the third surface of the body.

18. The coil assembly according to claim 1, wherein: The body has no supporting member for supporting the coil.

19. The coil assembly according to claim 1, wherein: The coil is formed as a single layer.

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