KR20240077379A - Coil component - Google Patents

Abstract

According to an embodiment of the present invention, provided is a coil component which comprises: a body including a first surface and a second surface facing each other; a coil disposed in the body and having a concave portion formed on a portion of the surface; an external electrode disposed on the first surface of the body; and a connection conductor connecting the coil and the external electrode. The connection conductor includes a charging region filled in at least a portion of the concave portion of the coil and a tapered region having a side surface inclined with respect to the first surface.

Description

Coil component {COIL COMPONENT}

The present invention relates to coil parts.

The inductor, one of the coil components, is a representative passive electronic component used in electronic devices along with resistors and capacitors.

As electronic devices become increasingly miniaturized, multi-functional, and high-performance, inductors are also required to be miniaturized, and at the same time, demand for inductors that do not reduce capacity due to miniaturization is increasing.

In order to minimize the decrease in capacity due to such miniaturization, it is required to maximize the volume of the magnetic material in the inductor. Additionally, in terms of power consumption efficiency, inductors with low direct current resistance (R _dc ) are required.

Domestic Published Patent No. 2016-0031391

One purpose of the present invention is to provide a coil component with a low direct current resistance (R _dc ) value.

Another object of the present invention is to provide a coil component with high inductance by minimizing the loss of the magnetic material.

According to one aspect of the present invention, a body including a first surface and a second surface opposing each other, a coil disposed within the body and having a concave portion formed on a portion of the surface, and an external coil disposed on the first surface of the body. It includes an electrode and a connecting conductor connecting the coil and the external electrode, wherein the connecting conductor includes a charging area filled in at least a portion of the concave portion of the coil and a tapered area having a side surface inclined with respect to the first surface. Coil parts that do are provided.

According to one embodiment of the present invention, the direct current resistance (R _dc ) value of the coil component can be reduced.

Additionally, according to one embodiment of the present invention, it is possible to secure high inductance by minimizing the loss of the magnetic material of the coil component.

1 is a diagram schematically showing a coil component according to a first embodiment of the present invention.
Figure 2 is an exploded perspective view of the coil as seen from the top.
Figure 3 is a perspective view of the coil of Figure 2 viewed from below.
Figures 4 to 6 are diagrams corresponding to cross-sections taken along line II' of Figure 1 and showing various charging structures of connecting conductors.
7 and 8 are plan views of a coil component according to a modified example as seen from one direction.
9 to 11 are views corresponding to a cross section taken along line II' of FIG. 1 as a modified example of the coil part according to the first embodiment.
FIG. 12 is a view corresponding to a cross section taken along line II′ of FIG. 1 as another modified example of the coil component according to the first embodiment.
Figure 13 is a diagram schematically showing a coil component according to a second embodiment of the present invention.
Figures 14 to 16 are diagrams corresponding to cross-sections taken along line II-II' of Figure 11 and showing various charging structures of connecting conductors.
FIG. 17 is a view corresponding to a cross section taken along line II-II' of FIG. 13 as a modified example of the coil part according to the second embodiment of FIG. 13.
Figure 18 is a diagram showing a connecting conductor of a coil component according to a second embodiment of the present invention.
Figure 19 is a diagram schematically showing a coil component according to a third embodiment of the present invention.
Figures 20 to 22 are diagrams corresponding to cross-sections taken along line III-III' of Figure 19 and showing various charging structures of connecting conductors.
FIG. 23 is a view corresponding to a cross section taken along line III-III' of FIG. 19 as a modified example of the coil part according to the third embodiment of FIG. 19.

Hereinafter, embodiments of the present invention will be described with reference to specific embodiments and attached drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Additionally, embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation, and elements indicated by the same symbol in the drawings are the same element.

Various types of electronic components are used in electronic devices, and various types of coil components can be appropriately used among these electronic components for purposes such as noise removal. In other words, coil parts in electronic devices are used as power inductors, HF inductors, general beads, GHz beads, common mode filters, etc. It can be.

(First Example)

1 is a diagram schematically showing a coil component according to a first embodiment of the present invention. Figure 2 is an exploded perspective view of the coil as seen from the top. Figure 3 is a perspective view of the coil of Figure 2 viewed from below. Figures 4 to 6 are views corresponding to cross-sections taken along line II' of Figure 1 and are views showing various charging structures of connecting conductors.

Referring to Figures 1 to 6, the coil component 1000 according to the present embodiment includes a body 100, a coil 300, external electrodes 400 and 500, and connecting conductors 710 and 720, and a support member. It may further include (200) and an insulating layer (600). Here, the connecting conductors (710, 720) have a side surface inclined with respect to the charging area (F) and the first surface (101) of the body (100) in at least a portion of the concave portions (D ₁ and D ₂ ) of the coil 300. It includes a tapered area (T) having. As in the present embodiment, the connecting conductors 710 and 720 are implemented in a form including a filling region (F) and a tapered region (T), so that plating can be advantageous during via hole fill plating by adjusting the aspect ratio of the via hole.

The body 100 forms the exterior of the coil component 1000, and the coil 300 and the support member 200 are disposed inside it. As shown, the body 100 may be formed as an overall hexahedron. The body 100 has a first surface 101 and a second surface 102 facing each other in a first direction (X direction), and a third surface 103 and a fourth surface facing each other in a second direction (Y direction). It may include a surface 104, a fifth surface 105, and a sixth surface 106 facing in the third direction (Z direction). Here, the second direction (Y direction) and the third direction (Z direction) may be perpendicular to the first direction (X direction). As an example, the body 100 has a length of 2.5 mm, a width of 2.0 mm, and a thickness of 1.0 mm, or a coil component 1000 according to this embodiment on which external electrodes 400 and 500, which will be described later, are formed, or 2.0 mm. It has a length of 1.2 mm, a width of 1.2 mm and a thickness of 0.65 mm, or it has a length of 1.6 mm, a width of 0.8 mm and a thickness of 0.8 mm, or it has a length of 1.0 mm, a width of 0.5 mm and a thickness of 0.5 mm. Alternatively, it may be formed to have a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.65 mm, but is not limited thereto. Meanwhile, since the above-mentioned values are merely design values that do not reflect process errors, etc., the range that can be recognized as a process error should be considered to fall within the scope of the present invention.

The first direction (X direction) length of the coil component 1000 described above is the first direction (X direction) - third direction (Z direction) cross section at the center of the second direction (Y direction) of the coil component 1000 ( Based on an optical microscope or SEM (Scanning Electron Microscope) photo for cross-section, the two outermost border lines facing in the first direction (X direction) of the coil part 1000 shown in the cross-section photo are connected, respectively, It may mean the maximum value among the dimensions of each of a plurality of line segments parallel to the first direction (X direction). Alternatively, the two outermost boundary lines facing each other in the first direction (X direction) of the coil component 1000 shown in the cross-sectional photograph are connected and the dimensions of each of a plurality of line segments parallel to the first direction (X direction) ) may mean the minimum value. Alternatively, the two outermost boundary lines facing each other in the first direction (X direction) of the coil component 1000 shown in the cross-sectional photograph are connected and the dimensions of each of a plurality of line segments parallel to the first direction (X direction) ) may mean the arithmetic average of at least three of the following. Here, a plurality of line segments parallel to the first direction (X direction) may be equally spaced from each other in the third direction (Z direction), but the scope of the present invention is not limited thereto.

The second direction (Y direction) length of the coil part 1000 described above is the first direction (X direction) - second direction (Y direction) cross section at the center of the third direction (Z direction) of the coil part 1000 ( Based on an optical microscope or SEM (Scanning Electron Microscope) photo for cross-section, the two outermost border lines facing in the second direction (Y direction) of the coil part 1000 shown in the cross-section photo are connected, respectively, It may mean the maximum value among the dimensions of each of a plurality of line segments parallel to the second direction (Y direction). Alternatively, the dimensions of each of a plurality of line segments connecting the two outermost boundary lines facing in the second direction (Y direction) of the coil component 1000 shown in the cross-sectional photo and parallel to the second direction (Y direction) ) may mean the minimum value. Alternatively, the dimensions of each of a plurality of line segments connecting the two outermost boundary lines facing in the second direction (Y direction) of the coil component 1000 shown in the cross-sectional photo and parallel to the second direction (Y direction) ) may mean the arithmetic average of at least three of the following. Here, a plurality of line segments parallel to the second direction (Y direction) may be equally spaced from each other in the first direction (X direction), but the scope of the present invention is not limited thereto.

The length of the above-described coil part 1000 in the third direction (Z direction) is the first direction (X direction) - third direction (Z direction) cross section at the center of the second direction (Y direction) of the coil part 1000 ( Based on an optical microscope or SEM (Scanning Electron Microscope) photo for cross-section, the two outermost border lines facing in the third direction (Z direction) of the coil part 1000 shown in the cross-section photo are connected, respectively, It may mean the maximum value among the dimensions of each of a plurality of line segments parallel to the third direction (Z direction). Alternatively, the dimensions of each of a plurality of line segments connecting the two outermost boundary lines facing in the third direction (Z direction) of the coil component 1000 shown in the cross-sectional photo and parallel to the third direction (Z direction) ) may mean the minimum value. Alternatively, the dimensions of each of a plurality of line segments connecting the two outermost boundary lines facing in the third direction (Z direction) of the coil component 1000 shown in the cross-sectional photo and parallel to the third direction (Z direction) ) may mean the arithmetic average of at least three of the following. Here, a plurality of line segments parallel to the third direction (Z direction) may be equally spaced from each other in the first direction (X direction), but the scope of the present invention is not limited thereto.

Meanwhile, each of the lengths of the coil component 1000 in the first to third directions may be measured using a micrometer measurement method. The micrometer measurement method is to set the zero point with a micrometer with Gage R&R (Repeatability and Reproducibility), insert the coil part 1000 according to this embodiment between the tips of the micrometer, and use the measuring lever of the micrometer. You can measure it by turning it. Meanwhile, when measuring the length of the coil part 1000 using the micrometer measurement method, the length of the coil part 1000 may mean a value measured once, or it may mean the arithmetic average of the values measured multiple times. .

Body 100 may include resin and magnetic material. Specifically, the body 100 may be formed by stacking one or more magnetic composite sheets in which magnetic materials are dispersed in resin. The magnetic material may be ferrite or metal magnetic powder. Ferrites include, for example, Mg-Zn-based, Mn-Zn-based, Mn-Mg-based, Cu-Zn-based, Mg-Mn-Sr-based, and spinel-type ferrites such as Ni-Zn-based, Ba-Zn-based, and Ba- It may be at least one of hexagonal ferrites such as Mg-based, Ba-Ni-based, Ba-Co-based, and Ba-Ni-Co-based, garnet-type ferrites such as Y-based, and Li-based ferrite. Metal magnetic powders include iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). It may include any one or more selected from the group consisting of. For example, metal magnetic powders include 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, and Fe-Ni-Mo-based alloy powder. 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- It may be at least one of Ni-Cr-based alloy powder and Fe-Cr-Al-based alloy powder. Magnetic metal powders may be amorphous or crystalline. For example, the metal magnetic powder may be Fe-Si-B-Cr based amorphous alloy powder, but is not necessarily limited thereto. Ferrite and magnetic metal powder may each have an average diameter of about 0.1㎛ to 30㎛, but are not limited thereto. The body 100 may include two or more types of magnetic materials dispersed in resin. Here, saying that the magnetic materials are of different types means that the magnetic materials dispersed in the resin are distinguished from each other by any one of average diameter, composition, crystallinity, and shape. For example, the magnetic material may use multiple types of metal magnetic powders having different sizes. Specifically, the first to third metal magnetic powders may each have a first to third diameter range. Here, the first diameter range may be 5-61 μm, the second diameter range may be 0.6-4.5 μm, and the third diameter range may be 10-900 nm. Meanwhile, the following description will be made on the premise that the magnetic material is a metal magnetic powder, but the scope of the present invention does not extend only to the body 100 having a structure in which metal magnetic powder is dispersed in resin. The resin may include epoxy, polyimide, liquid crystal polymer, etc., alone or in combination, but is not limited thereto.

The body 100 includes a core 110 that penetrates a coil 300, which will be described later. The core 110 may be formed by filling the through hole of the coil 300 with a magnetic composite sheet, but is not limited thereto.

The coil component 1000 according to this embodiment may further include a support member 200. The support member 200 is disposed within the body 100 and may support the coil 300. The support member 200 has one side facing the first side 101 and the second side 102 of the body 100 (in this embodiment, based on the drawings) and the other side (in this embodiment, based on the drawings). It has a top surface as the standard.

The support member 200 is formed of an insulating material containing a thermosetting insulating resin such as epoxy resin, a thermoplastic insulating resin such as polyimide, or a photosensitive insulating resin, or is an insulating material impregnated with reinforcing material such as glass fiber or inorganic filler. It can be formed from any material. For example, the support member 200 may be formed of insulating materials such as prepreg, Ajinomoto Build-up Film (ABF), FR-4, Bismaleimide Triazine (BT) resin, and Photo Imagable Dielectric (PID). , but is not limited to this. Inorganic fillers include silica (silicon dioxide, SiO ₂ ), alumina (aluminum oxide, Al ₂ O ₃ ), silicon carbide (SiC), barium sulfate (BaSO ₄ ), talc, clay, mica powder, and aluminum hydroxide (Al(OH). ) ₃ ), magnesium hydroxide (Mg(OH) ₂ ), calcium carbonate (CaCO ₃ ), magnesium carbonate (MgCO ₃ ), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO ₃ ), barium titanate ( At least one selected from the group consisting of BaTiO ₃ ) and calcium zirconate (CaZrO ₃ ) may be used. When the support member 200 is made of an insulating material including a reinforcing material, the support member 200 can provide better rigidity. When the support member 200 is formed of an insulating material that does not contain glass fiber, it may be advantageous to reduce the thickness of the coil component 1000 according to this embodiment. Additionally, based on the body 100 of the same size, the volume occupied by the coil 300 and/or the magnetic metal powder can be increased, thereby improving component characteristics. When the support member 200 is formed of an insulating material containing a photosensitive insulating resin, the number of processes for forming the coil 300 is reduced, which can be advantageous in reducing production costs. The thickness of the support member 200 may be, for example, 10 μm or more and 50 μm or less, but is not limited thereto.

Coil 300 is disposed within body 100. Specifically, the coil 300 includes a first coil 310 disposed on one side of the support member 200 (in the case of this embodiment, based on the drawing), and the other side of the support member 200 (in the case of this embodiment). In this case, it may include a second coil 320 disposed on the upper surface (based on the drawing). Hereinafter, the structure of the coil will be described with reference to FIGS. 1 to 3.

Figure 2 is an exploded perspective view of the coil as seen from the top.

The coil 300 may include a first coil 310, a first lead-out part 331, and a second lead-out part 332 disposed on one surface of the support member 200.

The coil 300 may include a second coil 320 and a second auxiliary draw-out portion 342 disposed on the other surface of the support member 200.

The first coil 310 and the second coil 320 form one or more turns around the core 110 and may have a planar spiral shape. However, it is not limited thereto, and the first coil 310 and the second coil 320 may also have an angled shape.

Referring to FIG. 2, on the lower surface of the support member 200, the first coil 310 is in contact with and connected to the first draw-out portion 331, and the first coil 310 and the first draw-out portion 331 are connected to the first pull-out portion 331. 2 It is spaced apart from the draw-out portion 332. In addition, on the upper surface of the support member 200, the second coil 320 is in contact with and connected to the second auxiliary draw-out portion 342, and the second coil 320 and the second auxiliary draw-out portion 342 are connected to the first auxiliary draw-out portion 342. It is spaced apart from the draw-out portion 341. That is, the first coil 310 is connected to the first lead-out unit 331, and the second coil 320 is connected through the second lead-out unit 332 and the second auxiliary lead-out unit 342. Meanwhile, since the first auxiliary draw-out unit 341 is unrelated to the electrical connection between the remaining components of the coil 300, it can be omitted in the present invention. In the case of an asymmetric structure in which the auxiliary draw-out portion 340 is formed only on one side of the body 100, the effective volume of the body 100 increases and the inductance characteristics can be improved.

The first via (V ₁ ) penetrates the support member 200 and contacts the first coil 310 and the second coil 320, respectively, for example, one area of the innermost turn of the first coil 310 and the second coil 310. 2 One area of the inner turn of the coil 320 can be connected. The second via (V ₂ ) penetrates the support member 200 and contacts the first draw-out portion 331 and the first auxiliary draw-out portion 341, respectively, and the third via (V ₃ ) penetrates the support member 200. It passes through and comes into contact with the second draw-out portion 332 and the second auxiliary draw-out portion 342, respectively. By doing this, the coil 300 can function as one coil as a whole.

The draw-out portions 331 and 332 and the auxiliary draw-out portions 341 and 342 may extend to the third and fourth faces 103 and 104 facing each other in the second direction (Y direction) of the body 100. there is. Specifically, the first draw-out portion 331 and the first auxiliary draw-out portion 341 may extend to the third surface 103 of the body 100, and the second draw-out portion 332 and the second auxiliary draw-out portion ( 342 may extend to the fourth side 104 of the body 100.

Figure 3 is a perspective view of the coil of Figure 2 viewed from below.

Referring to FIG. 3, concave portions D ₁ and D ₂ are formed on a portion of the surface of the coil 300. Specifically, recesses D ₁ and D ₂ are formed on a portion of the surface of the coil 300 (in the case of this embodiment, based on the drawing) facing the first surface 101 of the body 100. do. When processing a via hole in the body 100 using a laser or the like, the concave portions D ₁ and D ₂ may be formed as the via hole penetrates a portion of the coil 300. That is, the concave portions D ₁ and D ₂ may be formed on the surface of the coil 300 during the via hole processing process. Accordingly, some of the surfaces of the coil 300 may be more recessed inside the coil 300 than the rest.

The coil 300 is disposed on one side of the support member 200 and connected to the first coil 310, and is connected to the first draw-out portion 331 having a first concave portion (D ₁ ) and one side of the support member 200. It is disposed and connected to the second coil 320 and may include a second draw-out portion 332 having a second concave portion D ₂ .

As will be described later, the coil 300 and the external electrodes 400 and 500 are formed by filling at least a portion of the concave portions D ₁ and D ₂ of the coil 300 to form connecting conductors 710 and 720. You can connect. Specifically, the concave portions D ₁ and D ₂ may be charged by the charging area F and the vertical area V of the connecting conductors 710 and 720.

At least one of the components constituting the coil 300 may include one or more conductive layers. For example, when forming the coil 300 by applying a plating process to the surface of the support member 200, at least one of the components constituting the coil 300 includes a first conductive layer formed by electroless plating, etc. , may include a second conductive layer disposed on the first conductive layer. The first conductive layer may be a seed layer for forming the second conductive layer on the support member 200 by plating, 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 with a multi-layer structure may be formed as a conformal film structure in which one electroplating layer is covered by another electroplating layer, and another electroplating layer is laminated only on one side of one electroplating layer. It can also be formed into a shape. The coil 300 is made of copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloys thereof. It may be formed of a conductive material, but is not limited thereto.

Although not shown in the drawing, an insulating film may be formed on the surface of the coil 300. The insulating film may integrally cover the coil 300 and the support member 200. Specifically, the insulating film may be disposed between the coil 300 and the body 100, and between the support member 200 and the body 100. The insulating film may be formed along the surface of the support member 200 on which the coil 300 is formed, but is not limited thereto. The insulating film is used to electrically separate the coil 300 and the body 100, and may include a known insulating material such as paralene, but is not limited thereto. As another example, the insulating film may include an insulating material such as epoxy resin rather than paralene. The insulating film may be formed by vapor deposition, but is not limited thereto. As another example, the insulating film may be formed by laminating and curing an insulating film for forming an insulating film on both sides of the support member 200 on which the coil 300 is formed, and on both sides of the support member 200 on which the coil 300 is formed. It may also be formed by applying and curing an insulating paste to form an insulating film. Meanwhile, for the reasons described above, the insulating film is a configuration that can be omitted in this embodiment. That is, if the body 100 has sufficient electrical resistance at the designed operating current and voltage of the coil component 1000, the insulating film may be omitted in this embodiment.

The external electrodes 400 and 500 are disposed on the first surface 101 of the body 100. The external electrodes 400 and 500 may be disposed only on the first surface 101 of the body 100 as shown. In contrast, some of the external electrodes 400 and 500 may be disposed on the side of the body 100, that is, at least some of the third to sixth surfaces 103-106. The external electrode may include first and second external electrodes 400 and 500 connected to the first and second coils 310 and 320, respectively. Specifically, the first and second external electrodes 400 and 500 are arranged to be spaced apart from each other on the first surface 101 of the body 100, and are connected to the coil 300 through connection conductors 710 and 720, which will be described later. is connected to The first and second external electrodes 400 and 500 may serve to electrically connect the coil 300 within the coil component 1000 to the electronic device when the coil component 1000 is mounted on an electronic device. .

The first and second external electrodes 400 and 500 are copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), and chromium. It may be formed of a conductive material such as (Cr), titanium (Ti), or an alloy thereof, but is not limited thereto. The first and second external electrodes 400 and 500 may be formed in a multi-layer structure. For example, the first and second external electrodes 400 and 500 may be formed as a single layer, or alternatively, may be implemented as a multi-layer structure as shown in FIG. 4. Specifically, the external electrodes 400 and 500 are disposed on the first conductive layers 401 and 501 containing at least one of copper (Cu) and silver (Ag) and nickel ( It may include second conductive layers 402 and 502 containing Ni) and third conductive layers 403 and 503 disposed on the second conductive layers 402 and 403 and containing tin (Sn). The first conductive layers 401 and 501 may be a plating layer or a conductive resin layer formed by applying and curing a conductive resin containing a resin and a conductive powder containing at least one of copper (Cu) and silver (Ag). The second conductive layers 402 and 502 and the third conductive layers 403 and 503 may be plating layers, but the scope of the present invention is not limited thereto. Additionally, for purposes such as ensuring reliability, the first conductive layer 410 may include a plurality of the above-described conductive resin layers as needed.

The coil component 1000 according to this embodiment covers the outer surface of the body 100 and exposes the first surface 101, that is, the first and second external electrodes 400 and 500 disposed on the mounting surface. It may further include an insulating layer 600 disposed so as to For example, the insulating layer 600 may be formed by applying and curing an insulating material containing an insulating resin to the surface of the body 100. In this case, the insulating layer 600 is made of thermoplastic resin such as polystyrene-based, vinyl acetate-based, polyester-based, polyethylene-based, polypropylene-based, polyamide-based, rubber-based, acrylic-based, phenol-based, epoxy-based, urethane-based, and melamine-based. , may include at least one of a thermosetting resin such as an alkyd resin and a photosensitive insulating resin.

The connecting conductors 710 and 720 penetrate a portion of the body 100 and connect the coil 300 and the external electrodes 400 and 500. One end of the connecting conductors (710, 720) extends to the first surface (101) of the body (100) and is connected to the external electrodes (400, 500) disposed on the first surface (101), and the other end is connected to the coil (300). connected. By connecting the coil 300 and the external electrodes 400 and 500 with the connecting conductors 710 and 720 in this way, it is possible to implement a coil component with high inductance by minimizing the loss of the magnetic body.

The connecting conductors 710 and 720 connect the first connecting conductor 710 connecting the first drawing part 331 and the first external electrode 400, and the second drawing part 332 and the second external electrode 500. It may include a second connecting conductor 720 for connecting.

As will be described below, the connecting conductors 710 and 720 can be formed by irradiating the body 100 and the coil 300 with a laser, etc. to process via holes, and then performing fill plating within the via holes. When processing a via hole by laser drilling, the shape of the via hole can vary. Specifically, the via hole may have an inclined side with respect to the first surface 101 of the body 100, a side substantially perpendicular to the first surface 101 of the body 100, or a curved surface. You can have it. Alternatively, the via hole may include a first side and a second side having different inclination angles with respect to the first surface 101 of the body 100.

The connecting conductors 710 and 720 may be formed by fill plating a via hole. In this case, the shape of the connecting conductors 710 and 720 may be substantially the same as the shape of the via hole. That is, the connecting conductors 710 and 720 may be vias obtained by fill-plating via holes. Hereinafter, the shape and charging structure of the connecting conductors 710 and 720 will be described in detail with reference to FIGS. 4 to 6.

Figures 4 to 6 are views corresponding to cross-sections taken along line II' of Figure 1 and are views showing various charging structures of connecting conductors.

As described above, the connecting conductors 710 and 720 have a charging region F filled at least in part of the concave portions D ₁ and D ₂ of the coil 300 and the first surface 101 of the body 100. It includes a tapered region (T) having a side surface inclined with respect to . The tapered region (T) and the vertical region (V), which will be described later, can be formed by filling via holes with fill plating like the filling region (F), but in order to distinguish them from the filling region (F), they can be formed as above. refers to

The charging area F may charge at least a portion of the concave portions D ₁ and D ₂ of the coil 300 . As described above, the concave portions D ₁ and D ₂ are the first concave portion D ₁ formed in the first draw-out portion 331 and the second concave portion D formed in the second draw-out portion 332. ₂ ), each charging area (F) of the connecting conductors (710, 720) can charge at least a portion of the first and second concave portions (D ₁ , D ₂ ).

The side surfaces of the connecting conductors 710 and 720 forming the tapered region T are inclined with respect to the first surface 101 of the body 100. Accordingly, the cross section parallel to the first surface 101 of the tapered area T may gradually become larger or smaller in the first direction, and accordingly, a portion of the tapered area T may be formed as shown in the figure. It can deviate from the lead-out portions D1 and D2 in one direction (X direction) without overlapping them. The tapered region T may extend to the first surface 101 of the body 100 and be connected to the external electrodes 400 and 500. One purpose of this embodiment is to adjust the aspect ratio of the via hole so that plating is advantageous when plating the via hole fill. Via holes can be formed with various aspect ratios. The higher the aspect ratio, the more defects such as voids occur during plating, making fill plating more difficult. Specifically, when the aspect ratio is high, the depth of the via hole becomes deeper, making it difficult for the plating solution to circulate inside the via hole, which increases the occurrence of defects during fill plating. Accordingly, in this embodiment, a via hole with a tapered side surface is introduced, so that fill plating can be performed smoothly even when a via hole with a high aspect ratio is formed. Meanwhile, the side of the tapered area T does not necessarily have to have only one inclination angle, and the tapered area T may be implemented in a shape with multiple inclination angles or may even include a curved area.

The connecting conductors 710 and 720 may include a vertical region V having a side perpendicular to the first surface 101 of the body 100. Here, the meaning of 'perpendicular' includes the case where the side surfaces of the connecting conductors 710 and 720 and the first surface 101 form a substantially right angle. Accordingly, the area of the cross section parallel to the first surface 101 in the vertical region V may be substantially the same. However, the side of the vertical area (V) does not have to be perfectly perpendicular to the first surface 101, and means that the side of the vertical area (V) is substantially perpendicular to the first surface 101 when viewed as a whole. Therefore, for example, when the surfaces of the connecting conductors 710 and 720 have a high level of roughness, the side of the vertical region V may include some regions that are not vertical. The vertical region (V) may be disposed between the filling region (F) and the tapered region (T) to connect the filling region (F) and the tapered region (T). In other words, a via hole with a high aspect ratio can be designed through the vertical region (V), and at this time, the plating solution can be smoothly circulated inside the via hole through the tapered region (T).

Referring to FIGS. 4 and 5 , at least a portion of the vertical area V may be disposed in the concave portions D ₁ and D ₂ . In this case, at least part of the vertical area V is in contact with the recesses D ₁ , D ₂ . That is, at least a portion of the vertical area V may fill the concave portions D ₁ and D ₂ . Figure 4 is a diagram showing that the entire vertical area (V) is placed in the concave portions (D ₁ and D ₂ ), and Figure 5 shows a portion of the vertical area (V) being placed in the concave portions (D ₁ and D ₂ ). This is a drawing showing what has been done. However, the present invention is not limited thereto, and the vertical area V may not be disposed in the concave portions D ₁ and D ₂ .

Referring to FIG. 6 , the vertical region V may not be in contact with the concave portions D ₁ and D ₂ of the coil 300 . That is, the vertical area V may not fill the concave portions D ₁ and D ₂ of the coil 300.

The connecting conductors 710 and 720 may include a curved surface, and the curved surface may form part of the above-described charging area F. That is, the curved surfaces of the connecting conductors 710 and 720 may contact the concave portions D ₁ and D ₂ of the coil 300.

The charging structure of the connecting conductors 710 and 720 of the coil component 1000 according to the first embodiment can be confirmed as follows. A cross-sectional sample passing through the connecting conductors 710 and 720 is collected among the cross-sections in the first direction (X direction) and the second direction (Y direction) of the coil component. The recesses (D ₁ , D ₂ ) of the coil 300 may form part of a via hole, and the recesses (D ₁ , D ₂ ) are the charging area (F) and the vertical area of the connecting conductors (710, 720). Since it can be charged by (V), a boundary is formed between the concave portions of the coil (D ₁ , D ₂ ) and the connecting conductors 710 and 720. The filled structure can be confirmed by observing the boundary of the collected cross-sectional sample using an optical microscope or SEM (Scanning Electron Microscope) photo.

The aspect ratio of the tapered via hole can be designed as follows. The average value of the maximum and minimum diameters of the cross section parallel to the first surface 101 in the tapered area T of the connecting conductors 710 and 720 is referred to as a, and the first direction length of the tapered area T is referred to as c. When, c/a is greater than 0.18 and may be less than 12.25. The maximum diameter may be the diameter of the cross section extending to the body first surface 101 of the tapered area (T), and the minimum diameter may be the cross section at the point where the tapered area (T) meets the vertical area (or filling area). It may be the diameter of

The diameters of the connecting conductors 710 and 720 of the coil component 1000 according to this embodiment can be measured as follows. A cross-sectional sample passing through the center of the connecting conductors 710 and 720 is collected from the first direction (X direction) - second direction (Y direction) cross section of the coil component. Specifically, since the tapered region T has a truncated cone shape, one cross section parallel to the body first surface 101 and the other cross section at both ends of the tapered region in the first direction may be circular. The cross section passing through the center of the connecting conductors (710, 720) refers to the cross section passing through the centers of one cross section and the other cross section (circle) of the connecting conductors (710, 720). The diameter of the circle can be obtained by analyzing the collected cross-sectional sample using an optical microscope or SEM (Scanning Electron Microscope) photo. a may be the arithmetic mean of the maximum and minimum diameter values of the measured circle.

The first direction length of the tapered area T of the coil component 1000 according to this embodiment is the connection conductor 710, 720 among the first direction (X direction) - second direction (Y direction) cross sections of the coil component described above. ) can be obtained by collecting a cross-sectional sample passing through the center and measuring the distance between one cross-section and the other cross-section of the connecting conductors (710, 720) using an optical microscope or SEM (Scanning Electron Microscope) photo. .

The first connection conductor 710 is first drawn out inside the center line of the first draw out part 331 based on the direction (second direction) from the first draw out part 331 to the second draw out part 332. It may be connected to the portion 331, where the location of the first connection conductor 710 may be an area corresponding to the center of the first concave portion D1. Likewise, the second connecting conductor 720 is connected to a second outlet inside the center line of the second outlet 332 based on the direction (second direction) from the second outlet 332 to the first outlet 331. It may be connected to the lead-out portion 332, where the location of the second connection conductor 720 may be an area corresponding to the center of the second concave portion D2. That is, the first and second connecting conductors 710 and 720 may not be disposed at the center of the lead-out portions 331 and 332, but may be disposed to be biased toward the inside of the coil component 1000.

The first and second connecting conductors 710 and 720 may be disposed in positions that are symmetrical to each other. That is, if this is explained with reference to FIGS. 7 and 8, FIGS. 7 and 8 correspond to a plan view of the coil component according to a modified example as seen from one direction (a plan view viewed from below with respect to FIG. 1). First, referring to FIG. 7, when the first and second connecting conductors 710 and 720 face each other in the second direction (Y direction), the first and second connecting conductors 710 and 720 are connected to each other on one side parallel to the first side 101 of the body 100. The first and second connecting conductors 710 and 720 may have a symmetrical structure with respect to the center point (P) of the one surface or the center line (L) perpendicular to the second direction (Y direction). Here, the shape symmetrical with respect to the center line (L) of the one side corresponds to the embodiment of FIG. 1. Next, referring to FIG. 8, due to process errors, etc., the first and second connecting conductors 710 and 720 on one side parallel to the first side 101 of the body 100 are located at the center point ( It may be an asymmetric structure with respect to the center line (L) perpendicular to the P) or second direction (Y direction).

The method of forming the connecting conductors 710 and 720 is, for example, as follows. First, via holes are processed in the body 100 and the coil 300 using a method such as laser drilling or mechanical drilling. For example, via holes can be formed using two or more types of lasers with different processing widths. First, a via hole with an inclined side is processed by irradiating a laser with a large processing width, and then a via hole with a vertical or inclined side is processed using a laser with a small processing width. Next, fill plating, that is, filling with a conductive material, can be formed in the formed via hole.

Accordingly, the connecting conductors 710 and 720 may be fill-plated vias and may include a plating layer. The plating layer of the connecting conductors 710 and 720 may include copper (Cu), but is not limited thereto.

FIGS. 9 to 11 are views corresponding to a cross section taken along line II′ of FIG. 1 as a modified example of the coil component according to the first embodiment.

As will be explained below, R _dc tends to decrease as the connecting conductors (710, 720) are disposed inside the coil part, so as shown in FIGS. 9 to 11, the connecting conductors (710, 720) are connected to the lead-out portions (331, 332). ) can be in contact with the medial side.

Specifically, referring to FIGS. 9 to 11, the first connecting conductor 710 is connected to the side facing the inner turn of the first coil 310 in the first lead-out portion 331, and the second connecting conductor 720 may be connected to the side of the second draw-out portion 332 facing the first coil 310. In this case, inductor characteristics with lower direct current resistance (R _dc ) can be implemented.

Tables 1 and 2 below compare the inductor characteristics with a general bottom electrode inductor without forming a via (connecting conductor) when forming connecting conductors 710 and 720 having a tapered area (T).

Table 1 below is a table comparing the inductor characteristics according to the processing positions of the connection electrodes 710 and 720 and the first direction length c of the taper area (T) for the 1412 0.33μH model. Here, 1412 corresponds to a coil part whose width, length, and height are 1.4mm, 1.2mm, and 0.8mm, respectively.

AC D.C. size inductance electrode c
(μm) Connecting conductor position (μm) L _s @1Mhz
(μH) R _dc (mohm) I _sat
(A) L _s
(μH) 1412 R33 bottom electrode - - 0.3012 17.06 5.65 0.303 connecting conductor 32.5 outer 50 0.3049 21.29 5.65 0.3061 outer 25 0.3046 17.68 - 0.306 0 0.3044 17.04 5.64 0.3056 Medial 25 0.3041 16.79 - 0.3054 Medial 50 0.3037 16.64 5.62 0.305 65 outer 50 0.3048 20.4 5.63 0.3058 outer 25 0.3046 17.54 - 0.3058 0 0.3043 17.03 5.62 0.3057 Medial 25 0.304 16.73 - 0.3053 Medial 50 0.3035 16.64 6.63 0.3048 130 outer 50 0.3047 18.73 5.64 0.306 outer 25 0.3042 17.23 - 0.3058 0 0.3041 16.89 5.65 0.3054 Medial 25 0.3037 16.69 - 0.305 Medial 50 0.303 16.57 5.62 0.3044

Table 2 below is a table comparing the characteristics of the inductor according to the processing position of the connection electrodes 710 and 720 and the first direction length c of the taper area (T) for the 0804 0.68μH model. Here, 0804 corresponds to a coil part whose width, length, and height are 0.8mm, 0.4mm, and 0.65mm, respectively.

AC D.C. size inductance electrode c
(μm) Connecting conductor position (μm) L _s @1Mhz
(μH) R _dc (mohm) I _sat
(A) L _s
(μH) 0804 R68 bottom electrode - - 0.6378 326.27 0.8599 0.6397 connecting conductor 37.5 outer 50 0.6548 330.8 0.8419 0.6562 outer 25 0.6539 326.69 0.8427 0.6553 0 0.6524 325.79 0.8447 0.6539 Medial 24 0.6499 325.38 0.8472 0.6515 - - - - - 75 outer 50 0.6546 330.12 0.8412 0.6555 outer 25 0.6537 326.49 0.8428 0.6551 0 0.6521 325.72 0.8441 0.6536 Medial 24 0.6494 325.35 0.8476 0.6504 - - - - - 150 outer 50 0.6543 328.12 0.8413 0.6559 outer 25 0.653 326.08 0.843 0.6539 0 0.6508 325.57 0.8465 0.6524 Medial 24 0.6475 325.23 0.8503 0.6492 - - - - -

Referring to Tables 1 and 2 above, when forming the connection conductors 710 and 720, the inductance has a larger value compared to the bottom electrode inductor. In addition, it can be seen that the direct current resistance (R _dc ) tends to become smaller as the connecting conductors 710 and 720 move inside the electronic component.

FIG. 12 is a view corresponding to a cross section taken along line II′ of FIG. 1 as another modified example of the coil component according to the first embodiment.

Referring to FIG. 12, the filling area (F) includes a first side that is inclined with respect to the first surface 101 of the body 100, and the tapered area (T) includes a first side that is inclined with respect to the first surface 101 of the body 100. It may include a second side that is inclined with respect to the second side. That is, the side surface of the charging area F may not be a curved surface and may have a certain inclination angle from the first surface 101 of the body 100.

The first side and the second side may have different inclinations with respect to the first side 101 of the body 100. By forming via holes with different inclination angles, the circulation of the plating solution within the via hole can be facilitated, and a via hole with a high aspect ratio can be implemented.

The first side may have a lower inclination with respect to the first side 101 of the body 100 than the second side.

The inclination angle of the side of the connecting conductors 710 and 720 of the coil component 1000 according to this embodiment can be measured as follows. A cross-sectional sample passing through the center of the connecting conductors 710 and 720 is collected from the first direction (X direction) - second direction (Y direction) cross section of the coil component. Specifically, since the tapered region T has a truncated cone shape, one cross section parallel to the body first surface 101 and the other cross section at both ends of the tapered region in the first direction are circular. The cross section passing through the center of the connecting conductors (710, 720) refers to the cross section passing through the centers of one cross section and the other cross section (circle) of the connecting conductors (710, 720). The inclination angle can be obtained by measuring the angle formed by the first surface of the body 101 and the side surfaces of the connecting conductors 710 and 720 using an optical microscope or SEM (Scanning Electron Microscope) photo of the collected cross-sectional sample.

(Second Embodiment)

Figure 13 is a diagram schematically showing a coil component according to a second embodiment of the present invention. FIGS. 14 to 16 are views corresponding to cross sections taken along line II-II' of FIG. 11 and are views showing various charging structures of connecting conductors. FIG. 17 is a view corresponding to a cross section taken along line II-II' of FIG. 13 as a modified example of the coil component according to the second embodiment of FIG. 13. Figure 18 is a diagram showing a connecting conductor of a coil component according to a second embodiment of the present invention.

Hereinafter, with reference to FIGS. 13 to 18, the coil component 2000 according to the second embodiment will be described, and differences from the coil component 1000 according to the first embodiment will be described in detail.

One side of the connecting conductors 710 and 720 of the coil component 2000 according to the second embodiment extends to the third side 103 or the fourth side 104 of the body 100. Specifically, the first connecting conductor 710 extends to the third side 103 of the body 100, and the second connecting conductor 720 extends to the fourth side 104 of the body 100. This is a design to reduce the number of via holes processed, and may be the result of the fill-plated vias being cut. That is, fill-plated vias can be distributed to two adjacent chips when individual chips are cut. The coil component 2000 according to the second embodiment has a structure in which the connection conductors 710 and 720 extend to the side of the body 100, and the process can be simplified by reducing the number of via holes processed.

At least a portion of the cross-section parallel to the body first surface 101 of the connecting conductors 710 and 720 may have a semicircular shape. That is, the fill-plated vias can be split in half and distributed to two adjacent chips when individual chips are cut. Since the cross-section parallel to the first side of the via before individual chip cutting is circular, the cross-section of the connecting conductors 710 and 720 after cutting may have a semicircular shape. However, it is not limited to this, and some of the fill-plated vias may be removed when cutting individual chips and may not be distributed to two adjacent chips. In this case, as shown in FIG. 18 below, the cross section of the tapered region T of the connecting conductors 710 and 720 parallel to the first surface 101 of the body 100 may have an arc shape.

The body 100 may include a recess in which the connection conductors 710 and 720 are disposed. As previously described, a via hole may be formed across two different adjacent chips, and a portion of the via hole formed in either chip may be referred to as a recess. The recess is formed by drilling the body 100 and the coil 300 and then distributing fill-plated vias to different adjacent chips through a dicing process.

One side of the connecting conductors 710 and 720 and one side of the body may form a coplanar surface. Specifically, the first connecting conductor 710 has one side extending to the third surface 103 of the body 100, and one side of the first connecting conductor 710 extends to the third surface 103 of the body 100. ) can be substantially coextensive with. The second connecting conductor 720 has one side extending to the fourth surface 104 of the body 100, and one side of the second connecting conductor 720 is connected to the fourth surface 104 of the body 100. In practice, coexistence can be achieved. Here, one side of the first and second connecting conductors 710 and 720 may be a cut surface of a fill-plated via.

The aspect ratio of the recess of the coil component 2000 according to the second embodiment can be measured as follows.

If at least some of the cross sections parallel to the first surface 101 of the body in the connecting conductors 710 and 720 are semicircular, the maximum and minimum radii of the cross sections parallel to the first surface 101 in the tapered area T The average value of can be called a. Regarding the method of measuring the average value, the description in the first embodiment can be applied by analogy.

Figure 18 is a diagram showing the connecting conductor of the coil component 2000 according to the second embodiment of the present invention. Specifically, Figure 18(a) shows the second connecting conductor 720 in the case where the connecting conductors 710 and 720 have a vertical area V, and Figure 18(b) shows the connecting conductors 710 and 720 having a vertical area. The second connection conductor 720 is shown in the case where there is no area (V).

Referring to FIG. 18, a cross section of the tapered region T of the connecting conductors 710 and 720 parallel to the first surface 101 of the body 100 may have an arc shape. When one cross section and the other cross section parallel to the first surface 101 of the body 100 at both ends of the tapered region T in the first direction are referred to as S1 and S2, respectively, between the arc and the chord in the cross sections S1 and S2 The maximum values of the lengths along the second direction are called a ₁ and a ₂ , respectively. At this time, the average value of a ₁ and a ₂ is called a, and the length of the tapered area T in the first direction is called c. The aspect ratio of the recess is defined as c/a, and as in the first embodiment, c/a may be 0.18 or more and 12.25 or less.

The a value of the coil component 2000 according to this embodiment can be measured as follows. A cross-sectional sample passing through the center of the connecting conductors 710 and 720 is collected from the first direction (X direction) - second direction (Y direction) cross section of the coil component. The cross section passing through the center of the connecting conductors (710, 720) refers to the cross section passing through the center of one cross section and the other cross section (circle) of the via having a tapered area before cutting, and the description in the first embodiment can be inferred and applied. You can. The collected cross-sectional sample is analyzed using an optical microscope or SEM (Scanning Electron Microscope) photo to obtain the maximum value of the length along the second direction between the arc and chord of the connecting conductors (710, 720).

Table 3 below is a table showing the c/a range of the connecting conductors 710 and 720 of the coil component according to the second embodiment. Depending on the chip size (0804, 1007, 1412), connection conductor processing location, and cover thickness (thickness of the body embedding the coil), it can have various c/a ranges as shown in Table 3 below. c1, c2, and c3 are various examples of the first direction length (c) of the tapered region (T). Here, 0804 corresponds to a coil part whose width and height are 0.8mm and 0.4mm, respectively. Here, 1007 corresponds to a coil part whose width and height are 1.0 mm and 0.7 mm, respectively. Here, 1412 corresponds to a coil part whose width and height are 1.4 mm and 1.2 mm, respectively.

Chip size Central design processing standard Based on coil maximum inner shift Based on coil maximum outer shift c/a range 0804 a ₁ 115 142.6 65 0.28
~
5.25 a ₂ 65 92.6 15 a 90 117.6 40 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 100 μm) 33 67 100 33 67 100 33 67 100 c/a 0.37 0.74 1.11 0.28 0.57 0.85 0.83 1.68 2.50 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 150 μm) 50 100 150 50 100 150 50 100 150 c/a 0.56 1.11 1.67 0.43 0.85 1.28 1.25 2.50 3.75 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 180 μm) 60 120 180 60 120 180 60 120 180 c/a 0.67 1.33 2.00 0.51 1.02 1.53 1.50 3.00 4.50 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 210 μm) 70 140 210 70 140 210 70 140 210 c/a 0.78 1.56 2.33 0.60 1.19 1.79 1.75 3.50 5.25 1007 a ₁ 115 142.6 65 0.20
~
5.0 a ₂ 65 92.6 15 a 90 117.6 40 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 100 μm) 33 67 100 33 67 100 33 67 100 c/a 0.37 0.74 1.11 0.20 0.42 0.62 0.83 1.68 2.50 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 150 μm) 50 100 150 50 100 150 50 100 150 c/a 0.56 1.11 1.67 0.31 0.62 0.93 1.25 2.50 3.75 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 190 μm) 63 127 190 63 127 190 63 127 190 c/a 0.70 1.41 2.11 0.39 0.79 1.18 1.58 3.17 4.75 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 200 μm) 50 100 200 50 100 200 50 100 200 c/a 0.56 1.11 2.22 0.31 0.62 1.24 1.25 2.50 5.00 1412 a ₁ 115 142.6 65 0.18
~
12.25 a ₂ 65 92.6 15 a 90 117.6 40 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 100 μm) 33 66 100 33 66 100 33 66 100 c/a 0.37 0.73 1.11 0.18 0.36 0.54 0.83 1.65 2.50 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 130 μm) 32.5 65 130 32.5 65 130 32.5 65 130 c/a 0.36 0.72 1.44 0.18 0.35 0.70 0.81 1.63 3.25 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 150 μm) 37.5 75 150 37.5 75 150 37.5 75 150 c/a 0.42 0.83 1.67 0.20 0.41 0.81 0.94 1.88 3.75 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 317 μm) 106 211 317 106 211 317 106 211 317 c/a 1.17 2.35 3.52 0.57 1.14 1.71 2.64 5.28 7.93 c1 c2 c3 c1 c2 c3 c1 c2 c3 c (when cover t is 490 μm) 163 327 490 163 327 490 163 327 490 c/a 1.81 3.63 5.44 0.88 1.77 2.65 4.08 8.17 12.25

Other details regarding the connecting conductors 710 and 720 of the coil component 2000 according to the second embodiment are substantially the same as those described above in the description of the first embodiment, and the description of the first embodiment is the same. It can be applied. That is, as shown in FIGS. 12 to 14, various charging structures of the connecting conductors can be shown, and as shown in FIG. 15, the connecting conductors can be modified to have sides with different inclination angles.

Specifically, the connecting conductors 710 and 720 are perpendicular to the first side 101 of the body 100, except for one side exposed to the third side 103 or the fourth side 104 of the body 100. It can have one side. Among the connecting conductors (710, 720), except for one side exposed to the third side (103) or fourth side (104) of the body (100), the side side perpendicular to the first side (101) of the body (100) The area it has can be referred to as a vertical area (V) as in the first embodiment.

The vertical area (V) is disposed between the filling area (F) and the tapered area (T) to connect the filling area (F) and the tapered area (T).

At least a portion of the vertical area V may be disposed in the concave portions D ₁ and D ₂ . In the second embodiment, the recesses D ₁ , D ₂ may form part of a recess. This is because, as described above, in the case of the second embodiment, the via hole may be formed across two different adjacent chips, and a portion of the via hole formed in either chip may be referred to as a recess.

The connecting conductors (710, 720) include a curved surface, and the curved surface of the connecting conductors (710, 720) may form part of the charging area (F).

In the coil component 2000 according to the second embodiment, the insulating layer 600 covers the side surfaces of the connecting conductors 710 and 720 exposed from the body 100. As described above, the side surfaces of the first and second connecting conductors 710 and 720 extend to the third side 103 and the fourth side 104 of the body 100, respectively, and on the side surfaces extending from each side An insulating layer 600 is disposed.

Other contents are substantially the same as those described above in the description of the first embodiment, so detailed descriptions are omitted.

(Third Embodiment)

Figure 19 is a diagram schematically showing a coil component according to a third embodiment of the present invention. Figures 20 to 22 are views corresponding to cross-sections taken along line III-III' of Figure 19 and are views showing various charging structures of connecting conductors. FIG. 23 is a view corresponding to a cross section taken along line III-III' of FIG. 19 as a modified example of the coil component according to the third embodiment of FIG. 19.

Hereinafter, with reference to FIGS. 19 to 23, the coil component 3000 according to the third embodiment will be described, and differences from the coil components 1000 and 2000 according to the first and second embodiments will be described in detail.

In the case of the coil component 3000 according to the third embodiment, the connecting conductors 710 and 720 partially fill the recess of the body 100. The connecting conductors 710 and 720 may be formed along the surface of the recess of the body 100 and may fill only a portion of the recess.

The connecting conductors 710 and 720 of the coil component 3000 according to the third embodiment are formed as follows. In the third embodiment, unlike the first and second embodiments, the via hole may be partially plated rather than completely fill-plated. The partially plated vias can be cut and distributed to two adjacent chips, forming connecting conductors 710 and 720 that partially fill the recesses.

The coil component 3000 according to the third embodiment has the advantage of minimizing the amount of conductive material filling the via hole.

The aspect ratio of the recess of the coil component 3000 according to the third embodiment can be obtained by analogizing the method in the second embodiment. In other words, the a value can be obtained by analyzing the collected cross-sectional sample using an optical microscope or SEM (Scanning Electron Microscope) photo, assuming that the connecting conductors 710 and 720 have completely plated recesses.

Other contents are substantially the same as those described above in the description of the first and second embodiments, and detailed descriptions will be omitted.

Above, an embodiment of the present invention has been described, but those of ordinary skill in the art will understand that addition, change or deletion of components can be made without departing from the spirit of the present invention as set forth in the patent claims. The present invention may be modified and changed in various ways, and this will also be included within the scope of the rights of the present invention.

100: body
110: core
200: Support member
300: coil
310, 320: first and second coils
331, 332: first and second draw-out portions
341, 342: 1st and 2nd auxiliary withdrawal units
400, 500: external electrode
600: Insulating layer
710, 720: first and second connecting conductors
D ₁ , D ₂ : Concave portion
F: charging area
V: vertical area
T: Tapered area

Claims (33)

A body including a first surface and a second surface opposing each other;
a coil disposed within the body and having a concave portion formed on a portion of its surface;
an external electrode disposed on the first surface of the body; and
A connecting conductor connecting the coil and the external electrode; Includes,
The connecting conductor includes a charging region filled in at least a portion of the concave portion of the coil and a tapered region having a side surface inclined with respect to the first surface.
Coil parts.
According to claim 1,
The connecting conductor further includes a vertical region having a side perpendicular to the first surface,
Coil parts.
According to clause 2,
The vertical area is disposed between the filling area and the tapered area to connect the filling area and the tapered area,
Coil parts.
According to clause 2,
At least a portion of the vertical area is disposed in the recess,
Coil parts.
According to claim 1,
The tapered area is connected to the external electrode,
Coil parts.
According to claim 1,
The connecting conductor includes a curved surface,
Coil parts.
According to clause 6,
The curved surface forms part of the charging area,
Coil parts.
According to claim 1,
One side of the connecting conductor extends to the side of the body,
Coil parts.
According to clause 8,
The connecting conductor includes a vertical region having a side perpendicular to the first surface,
Coil parts.
According to clause 9,
The vertical area is disposed between the filling area and the tapered area to connect the filling area and the tapered area,
Coil parts.
According to clause 9,
At least a portion of the vertical area is disposed in the recess,
Coil parts.
According to clause 8,
The connecting conductor includes a curved surface,
Coil parts.
According to claim 12,
The curved surface forms part of the filling area,
Coil parts.
According to clause 8,
The body includes a recess in which the connecting conductor is disposed,
Coil parts.
According to claim 14,
One side of the connecting conductor and one side of the body form a coplanar surface,
Coil parts.
According to claim 14,
The connecting conductor partially fills the recess of the body,
Coil parts.
According to clause 8,
Further comprising an insulating layer covering a side of the connecting conductor exposed from the body,
Coil parts.
According to clause 8,
At least a portion of the cross section parallel to the first surface of the connecting conductor has a semicircular shape,
Coil parts.
According to claim 1,
wherein the filling area includes a first side slanted with respect to the first face, and the tapered area includes a second side slanted with respect to the first face,
Coil parts.
According to clause 19,
The first side and the second side have different inclinations with respect to the first side,
Coil parts.
According to claim 20,
The first side has a lower inclination relative to the first side than the second side,
Coil parts.
According to claim 1,
When the direction in which the first and second surfaces face each other is referred to as the first direction,
The average value (a) of the maximum and minimum diameters of the cross section parallel to the first surface in the tapered area and the first direction length (c) of the tapered area satisfy 0.18≤c/a≤12.25,
Coil parts.
According to claim 1,
The connecting conductor includes a plating layer,
Coil parts.
According to claim 1,
The external electrode includes first to third conductive layers sequentially disposed on the first side of the body,
Coil parts.
According to clause 24,
The first conductive layer is a conductive resin layer,
The first and second conductive layers are plating layers,
Coil parts.
According to clause 24,
The first to third conductive layers are plating layers,
Coil parts.
According to claim 1,
It further includes a support member disposed within the body and having one surface and the other surface facing the first and second surfaces of the body, respectively,
The coil includes a first coil disposed on one side of the support member and a second coil disposed on the other side of the support member,
The external electrode includes first and second external electrodes connected to the first and second coils, respectively.
Coil parts.
According to clause 27,
Further comprising a first via that penetrates the support member and connects an area of the innermost turn of the first coil and an area of the innermost turn of the second coil,
Coil parts.
According to clause 27,
The coil includes a first draw-out portion disposed on one surface of the support member, connected to the first coil, and having a first concave portion, and a first drawout portion disposed on one side of the support member, connected to the second coil, and having a second concave portion. It further includes 2 draw-out portions,
The connecting conductor includes a first connecting conductor connecting the first lead portion and the first external electrode, and a second connecting conductor connecting the second lead portion and the second external electrode.
Coil parts.
According to clause 29,
The first connection conductor is connected to the first lead-out part on the inner side of the center line of the first lead-out part, based on the direction from the first lead-out part to the second lead-out part,
The second connecting conductor is connected to the second lead out part inside the center line of the second lead out part, based on the direction from the second lead out part to the first lead out part,
Coil parts.
According to claim 30,
The first connecting conductor is connected to a side of the first lead-out portion facing the inner turn of the first coil,
The second connecting conductor is connected to a side of the second lead-out portion facing the first coil,
Coil parts.
According to clause 29,
When the direction in which the first and second surfaces face each other is referred to as the first direction, and the direction in which the first and second connecting conductors face each other while being perpendicular to the first direction is referred to as the second direction,
The first and second connecting conductors on one surface parallel to the first surface have a symmetrical structure with respect to the center point of the one surface or a center line perpendicular to the second direction,
Coil parts.
According to clause 29,
When the direction in which the first and second surfaces face each other is referred to as the first direction, and the direction in which the first and second connecting conductors face each other while being perpendicular to the first direction is referred to as the second direction,
The first and second connecting conductors on one surface parallel to the first surface have an asymmetric structure with respect to the center point of the one surface or the center line perpendicular to the second direction,
Coil parts.