KR20230038984A - Coil component - Google Patents

Abstract

A coil component is disclosed. The coil component according to one aspect of the present invention comprises: a body having one surface and the other surface facing each other and one side surface and the other side surface connecting the one surface and the other surface and having first and second cores spaced apart from each other; a substrate disposed in the body; first and second coil parts disposed on the substrate and wound around the first and second cores, respectively; a first dummy draw-out part disposed between the first and second coil parts to connect the first and second coil parts and having both ends exposed to the one side surface and the other side surface of the body, respectively; and first and second external electrodes spaced apart from each other on the body and connected to the first and second coil parts, respectively. Accordingly, a coil component with a high self-resonant frequency (SRF) can be provided.

Description

Coil component {COIL COMPONENT}

The present invention relates to coil components.

An inductor, one of coil parts, is a typical passive electronic component used in electronic devices along with resistors and capacitors.

BACKGROUND OF THE INVENTION [0002] As electronic devices become more high-performance and smaller, the number of electronic components used in electronic devices increases and becomes smaller.

Meanwhile, as the driving frequency of coil components increases, the demand for coil components having a high SRF (Self-Resonant Frequency) is increasing.

Japanese Patent Laid-Open No. 1997-283335 (published on October 31, 1997)

One of the objects according to an embodiment of the present invention is to provide a coil component having a high self-resonant frequency (SRF) by reducing parasitic capacitance (C _p ) inside the coil component.

According to one aspect of the present invention, one side and the other side facing each other, a body having first and second cores spaced apart from each other, having one side and the other side facing each other connecting the one side and the other side, and a substrate disposed in the body , disposed on the substrate, first and second coil parts wound on the first and second cores, and disposed between the first and second coil parts to connect the first and second coil parts; A first dummy lead-out part having both ends exposed to one side and the other side of the body, and first and second external electrodes spaced apart from each other on the body and connected to the first and second coil parts, respectively. A coil part to do is provided.

According to embodiments of the present invention, by disposing two series-connected coil units and a dummy draw-out unit therebetween, the parasitic capacitance (C _p ) inside the coil component is reduced and the coil has a high SRF (Self-Resonant Frequency). parts can be provided.

1 is a perspective view schematically illustrating a coil component according to an embodiment of the present invention.
FIG. 2 is a view showing a cross section taken along the line Ⅰ-Ⅰ′ of FIG. 1 .
FIG. 3 is a view showing a cross section taken along line II-II' of FIG. 1 .
FIG. 4 is a view showing a cross section taken along line III-III' of FIG. 1 .
5 is a diagram schematically illustrating a connection relationship between first and second coil units.
FIG. 6 is a view showing a cross section taken along line IV-IV′ of FIG. 1 .
7 is a perspective view schematically illustrating a coil component according to another embodiment of the present invention.
FIG. 8 is a view showing a cross section taken along line V-V′ of FIG. 7 .
FIG. 9 is a view showing a cross section taken along the line VI-VI' of FIG. 7 .
10 is a diagram schematically showing parasitic capacitance and an equivalent circuit inside a coil component according to an embodiment of the present invention.
11 is a graph showing an effect of increasing a Self-Resonant Frequency (SRF) of a coil component according to an embodiment of the present invention.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded. And, throughout the specification, "on" means to be located above or below the target part, and does not necessarily mean to be located on the upper side with respect to the direction of gravity.

In addition, coupling does not mean only the case of direct physical contact between each component in the contact relationship between each component, but another configuration intervenes between each component so that the component is in the other configuration. It should be used as a concept that encompasses even the case of contact with each other.

Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to the shown bar.

In the drawings, an L direction may be defined as a first direction or length direction, a W direction may be defined as a second direction or width direction, and a T direction may be defined as a third direction or thickness direction.

Hereinafter, a coil component according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are assigned the same reference numerals and overlapping descriptions thereof. will be omitted.

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.

That is, in electronic devices, coil parts are used as power inductors, HF inductors, general beads, GHz beads, common mode filters, etc. It can be.

(First embodiment)

1 is a perspective view schematically illustrating a coil component 1000 according to an embodiment of the present invention. FIG. 2 is a view showing a cross section taken along the line Ⅰ-Ⅰ′ of FIG. 1 . FIG. 3 is a view showing a cross section taken along line II-II' of FIG. 1 . FIG. 4 is a view showing a cross section taken along line III-III' of FIG. 1 . 5 is a diagram schematically illustrating a connection relationship between the first and second coil units 300 and 400 . FIG. 6 is a view showing a cross section taken along line IV-IV′ of FIG. 1 .

Meanwhile, in order to more clearly show the coupling between components, the external insulating layer on the body 100 applied to the present embodiment is omitted and illustrated.

1 to 6 , a coil component 1000 according to an embodiment of the present invention includes a body 100, a substrate 200, first and second coil units 300 and 400, and first and second coil units. 2 external electrodes 510 and 520, first and second dummy pull-outs 610 and 620, and may further include an insulating film IF.

The body 100 forms the exterior of the coil component 1000 according to the present embodiment, and the coil unit 300 and the substrate 200 are disposed inside.

The body 100 may be formed in the shape of a hexahedron as a whole.

Body 100, based on the direction of FIGS. 1 to 5, the first surface 101 and the second surface 102 facing each other in the longitudinal direction (L), the second surface facing each other in the width direction (W) It includes three surfaces 103 and a fourth surface 104, and a fifth surface 105 and a sixth surface 106 facing each other in the thickness direction T. Each of the first to fourth surfaces 101, 102, 103, and 104 of the body 100 connects the fifth surface 105 and the sixth surface 106 of the body 100 to the wall surface of the body 100. corresponds to Hereinafter, both end surfaces (one end and the other end) of the body 100 mean the first side 101 and the second side 102 of the body, and both sides (one side and the other side) of the body 100 ) means the third side 103 and the fourth side 104 of the body, and one side and the other side of the body 100 respectively form the fifth side 105 and the sixth side 106 of the body 100. can mean

For example, the body 100 has a length of 2.5 mm, a width of 2.0 mm, and a thickness of 1.0 mm, the coil part 1000 according to the present embodiment in which the external electrodes 510 and 520 to be described later are formed, or 2.0 mm long, 1.2 mm wide and 0.65 mm thick, or 1.6 mm long, 0.8 mm wide and 0.8 mm thick, or 1.0 mm long, 0.5 mm wide and 0.5 mm thick. Or, it may be formed to have a length of 0.8mm, a width of 0.4mm and a thickness of 0.65mm, but is not limited thereto. On the other hand, since the above-described numerical values are only design values that do not reflect process errors, etc., it should be regarded that the range that can be recognized as a process error belongs to the scope of the present invention.

The above-described length of the coil component 1000 refers to an optical microscope or SEM for a cross-section in the longitudinal direction (L)-thickness direction (T) of the central portion in the width direction (W) of the coil component 1000. Based on the (Scanning Electron Microscope) photograph, the two outermost boundary lines facing each other in the longitudinal direction (L) of the coil part 1000 shown in the cross-sectional photograph are connected to each of a plurality of line segments parallel to the longitudinal direction (L). It may mean the maximum value among the dimensions of . Alternatively, the minimum value of the dimensions of each of a plurality of line segments that connect the two outermost boundary lines facing each other in the longitudinal direction (L) of the coil component 1000 shown in the cross-sectional photograph and are parallel to the longitudinal direction (L) it could mean Alternatively, at least 3 of the dimensions of each of a plurality of line segments that connect the two outermost boundary lines facing each other in the longitudinal direction (L) of the coil component 1000 shown in the cross-sectional photograph and are parallel to the longitudinal direction (L) It may mean one or more arithmetic average values. Here, the plurality of line segments parallel to the longitudinal direction (L) may be equally spaced from each other in the thickness direction (T), but the scope of the present invention is not limited thereto.

The above-described thickness of the coil component 1000 refers to an optical microscope or SEM for a cross-section in the longitudinal direction (L)-thickness direction (T) of the central portion in the width direction (W) of the coil component 1000. Based on the (Scanning Electron Microscope) photograph, each of a plurality of line segments parallel to the thickness direction (T) connects the two outermost boundary lines facing each other in the thickness direction (T) of the coil part 1000 shown in the cross-sectional photograph. It may mean the maximum value among the dimensions of . Alternatively, the minimum value of the dimensions of each of a plurality of line segments parallel to the thickness direction (T) and connecting the two outermost boundary lines facing each other in the thickness direction (T) of the coil component 1000 shown in the cross-sectional photograph it could mean Alternatively, at least 3 of the dimensions of each of a plurality of line segments that connect the two outermost boundary lines facing each other in the thickness direction (T) of the coil component 1000 shown in the cross-sectional photograph and are parallel to the thickness direction (T) It may mean one or more arithmetic average values. Here, the plurality of line segments parallel to the thickness direction (T) may be equally spaced from each other in the longitudinal direction (L), but the scope of the present invention is not limited thereto.

The above-described width of the coil component 1000 refers to an optical microscope or SEM of a cross-section in the longitudinal direction (L)-width direction (W) of the coil component 1000 at the central portion in the thickness direction (T). Based on the (Scanning Electron Microscope) photograph, each of a plurality of line segments parallel to the width direction (W) connects the two outermost boundary lines facing each other in the width direction (W) of the coil component 1000 shown in the cross-sectional photograph. It may mean the maximum value among the dimensions of . Alternatively, the minimum value of the dimensions of each of a plurality of line segments parallel to the width direction (W) and connecting the two outermost boundary lines facing each other in the width direction (W) of the coil component 1000 shown in the cross-sectional photograph it could mean Alternatively, at least 3 of the dimensions of each of a plurality of line segments that connect the two outermost boundary lines facing each other in the width direction (W) of the coil component 1000 shown in the cross-sectional photograph and are parallel to the width direction (W) It may mean one or more arithmetic average values. Here, the plurality of line segments parallel to the width direction (W) may be equally spaced from each other in the length direction (L), but the scope of the present invention is not limited thereto.

Alternatively, each of the length, width, and thickness of the coil component 1000 may be measured by a micrometer measurement method. The micrometer measurement method is to measure by setting the zero point with a Gage R&R (Repeatability and Reproducibility) micrometer, inserting the coil part 1000 according to the present embodiment between the tips of the micrometer, and turning the measurement lever of the micrometer. can Meanwhile, in measuring the length of the coil component 1000 by the micrometer measurement method, the length of the coil component 1000 may mean a value measured once or may mean an arithmetic average of values measured a plurality of times. . This may be equally applied to the width and thickness of the coil component 1000 .

The body 100 may include an insulating resin and a magnetic material. Specifically, the body 100 may be formed by stacking one or more magnetic composite sheets in which a magnetic material is dispersed in an insulating resin. The magnetic material may be ferrite or metallic magnetic powder.

Ferrites include, for example, Mg-Zn-based, Mn-Zn-based, Mn-Mg-based, Cu-Zn-based, Mg-Mn-Sr-based, Ni-Zn-based spinel ferrite, Ba-Zn-based, 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 ferrites, garnet-type ferrites such as Y-based ferrites, and Li-based ferrites.

The metal magnetic powder includes 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, 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- It may be at least one of Ni-Cr-based alloy powder and Fe-Cr-Al-based alloy powder.

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

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

The body 100 may include two or more types of magnetic materials dispersed in resin. Here, when the magnetic materials are of different types, it means that the magnetic materials dispersed in the resin are distinguished from each other by one of average diameter, composition, crystallinity, and shape.

Meanwhile, hereinafter, description will be made on the premise that the magnetic material is a magnetic metal powder, but the scope of the present invention does not extend only to the body 100 having a structure in which the magnetic metal powder is dispersed in an insulating resin.

The insulating resin may include epoxy, polyimide, liquid crystal polymer, etc. alone or in combination, but is not limited thereto.

The body 100 includes cores 110 and 120 penetrating a substrate 200 and coil units 300 and 400 to be described later. Specifically, the first core 110 may pass through the substrate 200 and the first coil unit 300 , and the second core 120 may pass through the substrate 200 and the second coil unit 400 . .

The first and second cores 110 and 120 may be formed by filling a through hole penetrating the central portion of each of the first and second coil units 300 and 400 and the substrate 200 with a magnetic composite sheet. It is not limited thereto.

The substrate 200 is disposed inside the body 100 . The substrate 200 supports the coil units 300 and 400 and the dummy pull-out units 610 and 620 to be described later.

The substrate 200 is formed of an insulating material including a thermosetting insulating resin such as epoxy resin, a thermoplastic insulating resin such as polyimide, or a photosensitive insulating resin, or an insulating material in which a reinforcing material such as glass fiber or inorganic filler is impregnated into such an insulating resin. It can be made of material. For example, the substrate 200 may be formed of an insulating material such as prepreg, ABF (Ajinomoto Build-up Film), FR-4, BT (Bismaleimide Triazine) resin, PID (Photo Imagable Dielectric), It is not limited thereto.

Inorganic fillers include silica (silicon dioxide, SiO ₂ ), alumina (aluminum oxide, Al ₂ O ₃ ), silicon carbide (SiC), barium sulfate (BaSO ₄ ), talc, mud, mica powder, 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 ( BaTiO ₃ ) and at least one selected from the group consisting of calcium zirconate (CaZrO ₃ ) may be used.

When the substrate 200 is formed of an insulating material including a reinforcing material, the substrate 200 may provide superior rigidity. When the substrate 200 is formed of an insulating material that does not contain glass fibers, it is advantageous to reduce the thickness of the coil component 1000 according to the present embodiment. In addition, based on the body 100 of the same size, the volume occupied by the coil parts 300 and 400 and/or the magnetic metal powder can be increased, so that component characteristics can be improved. When the substrate 200 is formed of an insulating material including a photosensitive insulating resin, the number of processes for forming the coil units 300 and 400 is reduced, which is advantageous in reducing production costs, and fine vias 320 and 420 can be formed.

The thickness of the substrate 200 may be, for example, 10 μm or more and 50 μm or less, but is not limited thereto.

The coil parts 300 and 400 are disposed inside the body 100 to express the characteristics of the coil part 1000 . For example, when the coil part 1000 of the present embodiment is used as a power inductor, the coil parts 300 and 400 may play a role of stabilizing the power of an electronic device by maintaining an output voltage by storing an electric field as a magnetic field. there is. Meanwhile, in the coil component 1000 according to the present embodiment, the first and second coil units 300 and 400 are connected in series to each other and disposed in a body, and the first coil unit 300 and the second coil unit ( 400), by disposing the first dummy draw-out unit 610 to be described later, parasitic capacitance (C _p ) can be reduced, and as a result, a high Self-Resonant Frequency (SRF) can be obtained. Detailed principles and effects will be described later.

The coil component 1000 according to the present embodiment includes a first coil unit 300 and a second coil unit 400 connected in series to each other inside the body 100 .

Referring to FIG. 2 , the first coil part 300 includes first and second coil patterns 311 and 312, a first via 320, a first lead-out part 330, and a first connection part 340. do. Specifically, the first coil pattern 311 and the first lead-out part 330 are formed on the upper surface of the substrate 200 facing the fifth surface 105 of the body 100 based on the directions of FIGS. 1 to 6 is disposed, and the second coil pattern 312 and the first connection part 340 are disposed on the lower surface of the substrate 200 facing the sixth surface 106 of the body 100 .

In addition, the second coil part 400 includes the third and fourth coil patterns 411 and 412 , the second via 420 , the second lead-out part 430 and the second connection part 440 . Specifically, based on the directions of FIGS. 1 to 6 , the third coil pattern 411 and the second connection part 440 are formed on the lower surface of the substrate 200 facing the sixth surface 106 of the body 100. and the fourth coil pattern 412 and the second lead-out part 430 are disposed on the upper surface of the substrate 200 facing the fifth surface 105 of the body 100 .

Referring to FIGS. 2 and 3 , the first via 320 penetrates the substrate 200 and is connected to inner ends of the first coil pattern 311 and the second coil pattern 312 , respectively. The first lead-out portion 330 is connected to the first coil pattern 311, exposed to the first surface 101 of the body 100, and connected to a first external electrode 510 to be described later. One end of the first connection part 340 is connected to the second coil pattern 312 , and the other end of the first connection part 340 is connected to a first dummy drawing part 610 to be described later.

Referring to FIGS. 2 and 4 , the second via 420 penetrates the substrate 200 and is connected to inner ends of the third coil pattern 411 and the fourth coil pattern 412 , respectively. The second lead-out portion 430 is connected to the fourth coil pattern 412, exposed to the second surface 102 of the body 100, and connected to a second external electrode 520 to be described later. One end of the second connection part 440 is connected to the third coil pattern 411, and the other end of the second connection part 440 is connected to a first dummy drawing part 610 to be described later.

That is, referring to FIG. 5 , the input from the first external electrode 510 includes the first lead-out part 330, the first coil pattern 311, the first via 320, the second coil pattern 312, The first connecting part 340, the first dummy drawing part 610, the second connecting part 440, the third coil pattern 411, the second via 420, the fourth coil pattern 412, and the second drawing part It may be output through the second external electrode 520 after passing through 430 in turn.

In this way, the first and second coil units 300 and 400 may function as a single coil as a whole between the first and second external electrodes 510 and 520 .

Referring to FIGS. 1 and 2 , each of the first coil pattern 311 and the second coil pattern 312 has a planar spiral shape in which at least one turn is formed around the first core 110 as an axis. can be The first coil pattern 311 may form at least one turn on the upper surface of the substrate 200 with the first core 110 as an axis. The second coil pattern 312 may form at least one turn on the lower surface of the substrate 200 with the first core 110 as an axis.

In addition, each of the third coil pattern 411 and the fourth coil pattern 412 may have a planar spiral shape in which at least one turn is formed around the second core 120 as an axis. The third coil pattern 411 may form at least one turn on the lower surface of the substrate 200 with the second core 120 as an axis. The fourth coil pattern 412 may form at least one turn on the upper surface of the substrate 200 with the second core 120 as an axis.

The first and second lead parts 330 and 430 are exposed to the first and second surfaces 101 and 102 of the body 100, respectively. Specifically, the first lead-out portion 330 is exposed to the first surface 101 of the body 100, and the second lead-out portion 430 is exposed to the second surface 102 of the body 100.

The first connection part 340 may connect the second coil pattern 312 and the first dummy drawing part 610 . Also, the second connection part 440 may connect the third coil pattern 411 and the first dummy drawing part 610 .

At least one of the coil patterns 311 , 312 , 411 , and 412 , vias 320 and 420 , lead portions 330 and 430 , and connection portions 340 and 440 may include at least one conductive layer.

For example, the first and fourth coil patterns 311 and 412, the first and second vias 320 and 420, and the first and second lead-out portions 330 and 430 are plated on the top surface of the substrate 200. In the case of forming, the first and fourth coil patterns 311 and 412, the first and second vias 320 and 420, and the first and second lead-out portions 330 and 430 form a seed layer and an electrolytic plating layer, respectively. can include Here, the electrolytic plating layer may have a single-layer structure or a multi-layer structure. The electroplating layer of the multi-layer structure may be formed in a conformal film structure in which another electroplating layer is formed along the surface of one electroplating layer, and the other electroplating layer is only on one surface of the one electroplating layer. It may be formed in this laminated shape. The seed layer may be formed by a vapor deposition method such as electroless plating or sputtering. The seed layers of the first and fourth coil patterns 311 and 412, the first and second vias 320 and 420, and the first and second lead-out portions 330 and 430 are integrally formed so that there is no boundary between them. It may not be formed, but is not limited thereto. The electroplating layers of the first and fourth coil patterns 311 and 412, the first and second vias 320 and 420, and the first and second lead-out portions 330 and 430 are integrally formed, so that there is no boundary between them. It may not be formed, but is not limited thereto.

The coil patterns 311, 312, 411, and 412, the vias 320 and 420, the lead-out parts 330 and 430, and the connection parts 340 and 440, respectively, are made of copper (Cu), aluminum (Al), or silver (Ag). , tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), or may be formed of a conductive material such as alloys thereof, but is not limited thereto.

The first dummy drawing unit 610 may be disposed between the first and second coil units 300 and 400 to reduce the total parasitic capacitance (C _p ) of the coil component 1000 .

Referring to FIGS. 1 to 2 and 5 to 6 , in the coil component 1000 according to the present embodiment, the first dummy lead-out portion 610 faces the sixth surface 106 of the body 100. It may be disposed on the lower surface of 200 and connected to the first and second coil units 300 and 400, respectively. Specifically, the first dummy lead-out part 610 is directly connected to the first connection part 340 extending from the second coil pattern 312 and is directly connected to the second connection part 440 extending from the third coil pattern 411. are directly connected

The first dummy pull-out unit 610 may be formed in a bar shape parallel to the width direction (W direction) of the body 100 . Both ends of the first dummy pull-out part 610 may be exposed to the third surface 103 and the fourth surface 104 of the body 100 , respectively. In the coil component 1000 according to the present embodiment, the first dummy pull-out part 610 may be disposed perpendicular to the direction in which the first and second draw-out parts 330 and 430 are pulled out, respectively. In this case, the length of the first dummy draw-out part 610 may have substantially the same dimension as the width of the body 100, but is not limited thereto.

Referring to FIG. 6 , the first dummy draw-out part 610 may be disposed on the lower surface of the substrate 200 and may be covered by an insulating film IF to be described later.

The first dummy drawing part 610 may include at least one conductive layer. For example, when the first dummy lead-out portion 610 is formed on the lower surface of the substrate 200 by plating, the first dummy draw-out portion 610 may include a seed layer and an electroplating layer. Here, the electrolytic plating layer may have a single-layer structure or a multi-layer structure. The electroplating layer of the multi-layer structure may be formed in a conformal film structure in which another electroplating layer is formed along the surface of one electroplating layer, and the other electroplating layer is only on one surface of the one electroplating layer. It may also be formed in this laminated shape. The seed layer may be formed by a vapor deposition method such as electroless plating or sputtering.

Meanwhile, the first dummy drawing part 610 performs a plating process of the second and third coil patterns 312 and 411, the first and second vias 320 and 420, and the first and second connection parts 340 and 440. It can be formed in the same process as In this case, each of the first dummy draw-out part 610, the second and third coil patterns 312 and 411, the first and second vias 320 and 420, and the first and second connection parts 340 and 440 The seed layers may be integrally formed so that a boundary may not be formed between them, but is not limited thereto. In addition, electrolysis of the first dummy draw-out part 610, the second and third coil patterns 312 and 411, the first and second vias 320 and 420, and the first and second connection parts 340 and 440, respectively. The plating layers may be integrally formed so that a boundary may not be formed between them, but is not limited thereto.

The first dummy draw-out part 610 includes copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium It may be formed of a conductive material such as (Cr) or an alloy thereof, but is not limited thereto.

The insulating film IF is disposed between the coil units 300 and 400 and the body 100 , between the first dummy pull-out unit 610 and the body 100 , and between the substrate 200 and the body 100 . The insulating film IF covers the surface of the substrate 200 on which the coil patterns 311, 312, 411, and 412, the lead parts 330 and 340, the connection parts 340 and 440, and the first dummy draw part 610 are formed. It may be formed according to, but is not limited thereto.

The insulating film IF is for insulating the coil units 300 and 400 from the body 100, and may include a known insulating material such as parylene, but is not limited thereto. As another example, the insulating layer IF may include an insulating material such as epoxy resin other than parylene. The insulating film IF may be formed by a vapor deposition method, but is not limited thereto. As another example, the insulating film IF may be formed by laminating and curing an insulating film for forming the insulating film IF on both sides of the substrate 200 on which the coil parts 300 and 400 are formed. 400) may be formed by applying and curing an insulating paste for forming the insulating film IF on both sides of the substrate 200 formed thereon. Meanwhile, for the reasons described above, the insulating film IF is a component 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 according to the present embodiment, the insulating film IF may be omitted in the present embodiment.

The external electrodes 510 and 520 are spaced apart from each other on the body 100 and connected to the coil units 300 and 400, respectively. Specifically, the first external electrode 510 is disposed on the first surface 101 of the body 100, and the first surface of the first coil unit 300 exposed through the first surface 101 of the body 100. The second external electrode 520 is connected in contact with the lead-out part 330 and is disposed on the second surface 102 of the body 100 so as to expose the second nose through the second surface 102 of the body 100. It is contact-connected with the second lead-out portion 430 of the part 400 .

The first external electrode 510 may be disposed on the first surface 101 of the body 100 and may extend to at least a portion of the third to sixth surfaces 103, 104, 105, and 106 of the body 100. . The second external electrode 520 may be disposed on the second surface 102 of the body 100 and may extend to at least a portion of the third to sixth surfaces 103, 104, 105, and 106 of the body 100. .

The external electrodes 510 and 520 may be formed by a vapor deposition method such as sputtering and/or a plating method, but are not limited thereto.

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

The external electrodes 510 and 520 may have a single-layer or multi-layer structure. For example, the external electrodes 510 and 520 are disposed on the first conductive layer and the first conductive layer containing copper (Cu) and disposed on the second conductive layer and the second conductive layer containing nickel (Ni). A third conductive layer containing tin (Sn) may be included. At least one of the second conductive layer and the third conductive layer may be formed to cover the first conductive layer, but the scope of the present invention is not limited thereto. The first conductive layer may be a plating layer or a conductive resin layer formed by applying and curing a conductive resin containing a resin and conductive powder containing at least one of copper (Cu) and silver (Ag). The second and third conductive layers may be plating layers, but the scope of the present invention is not limited thereto.

The coil component 1000 according to the present embodiment may further include external insulating layers disposed on the third to sixth surfaces 103 , 104 , 105 , and 106 of the body 100 . The external insulating layer may be disposed in a region other than the region where the external electrodes 510 and 520 are disposed.

At least some of the external insulating layers disposed on each of the third to sixth surfaces 103, 104, 105, and 106 of the body 100 are formed in the same process and formed integrally without a boundary between them. However, the scope of the present invention is not limited thereto.

The external insulating layer may be formed by forming an insulating material for forming the external insulating layer using a printing method, vapor deposition, spray coating method, film lamination method, or the like, but is not limited thereto.

The outer insulating layer is made of a thermoplastic resin such as polystyrene, vinyl acetate, polyester, polyethylene, polypropylene, polyamide, rubber, acrylic, phenol, epoxy, urethane, melamine, alkyd, etc. Thermosetting resin, photosensitive resin, parylene, SiO _x or SiN _x may be included. The external insulating layer may further include an insulating filler such as an inorganic filler, but is not limited thereto.

(Second embodiment)

7 is a schematic perspective view of a coil component 2000 according to another embodiment of the present invention. FIG. 8 is a view showing a cross section taken along line V-V′ of FIG. 7 . FIG. 9 is a view showing a cross section taken along the line VI-VI′ of FIG. 7 .

Meanwhile, in order to more clearly show the coupling between components, the external insulating layer on the body 100 applied to the present embodiment is omitted and illustrated.

7 to 9 , the coil component 2000 according to another embodiment of the present invention, compared to the coil component 1000 according to one embodiment of the present invention, the second dummy draw-out part 620 is added. There is a difference in that it is placed as . Therefore, in describing the present embodiment, only the second dummy pullout 620 different from the first embodiment of the present invention will be described. The description of the first embodiment of the present invention can be applied to the rest of the configuration of this embodiment as it is.

The coil component 2000 according to another embodiment of the present invention may further include a second dummy pull-out part 620 .

When the second dummy pull-out unit 620 is further included, between the first coil pattern 311 and the second dummy pull-out unit 620 and between the fourth coil pattern 412 and the second dummy pull-out unit 620 Since parasitic capacitance (C _p ) is generated, the parasitic capacitance (C _p ) component connected in series increases, thereby further reducing the parasitic capacitance (C _p ) of the entire coil part 2000. It can be.

Additionally, the second dummy draw-out unit 620 may also perform a mutual separation function of parasitic capacitance (C _p ) that may be formed between the first coil unit 300 and the second coil unit 400 . For example, the second dummy pull-out unit 620 may be formed between the first coil unit 300 and the second external electrode 520, or between the second coil unit 400 and the first external electrode 510, or between the first and second external electrodes 510. And parasitic capacitance (C _p ) that may be formed between the fourth coil patterns 311 and 412 may be separated. Through this structure, the effect of increasing SRF (Self-Resonant Frequency) can be further improved.

Referring to FIG. 8 , the second dummy pull-out part 620 is disposed on the upper surface of the substrate 200 facing the fifth surface 105 of the body 100, and the first and second coil parts 300 and 400 And may be arranged to be spaced apart from each other.

The second dummy pull-out part 620 may be formed in a bar shape parallel to the width direction (W direction) of the body 100 . Both ends of the second dummy pull-out part 620 may be exposed to the third surface 103 and the fourth surface 104 of the body 100 , respectively. In the coil component 2000 according to the present embodiment, the second dummy pull-out part 620 may be disposed perpendicular to the direction in which the first and second pull-out parts 330 and 430 are pulled out, respectively. In this case, the length of the second dummy draw-out part 620 may have substantially the same dimension as the width of the body 100, but is not limited thereto.

Referring to FIG. 9 , the first and second dummy pull-outs 610 and 620 may be respectively disposed on both sides of the substrate 200 and may be covered by an insulating layer IF.

(Principle of SRF rise and experimental data)

10 is a diagram schematically illustrating a parasitic capacitance (C _p ) and an equivalent circuit inside a coil component 1000 according to an embodiment of the present invention. 11 is a graph showing an effect of increasing a Self-Resonant Frequency (SRF) of the coil component 1000 according to an embodiment of the present invention.

Referring to FIGS. 1 and 10 , an approximate location and type of parasitic capacitance (C _p ) are generated in a schematic diagram of a coil component 1000 according to an embodiment of the present invention.

First, parasitic capacitance (C _pc ) between coils may be generated between the coil patterns on both sides of the substrate 200 in the cores 110 and 120 of each of the coil units 300 and 400 . In addition, parasitic capacitance C _pe may also be generated between the external electrodes 510 and 520 and adjacent coil patterns.

Also, a parasitic capacitance C _pd may be generated between the first dummy drawing unit 610 and an adjacent coil pattern.

Meanwhile, the self-resonant frequency (SRF) of the coil component is determined as follows.

And, when the coils are connected in series from the point of view of the equivalent circuit, the L and C values are as follows.

,

,

Therefore, when the coil parts are connected in series, the L value increases and the C value decreases. In addition, even if the L value is maintained, the total value of C _p is reduced due to the series addition of the parasitic capacitance (C _p ), and as a result, Self-Resonant Frequency (SRF) may be increased.

Table 1 is the experimental data for L, Cp _{, and} SRF of a general coil component with one coil unit and no dummy lead-out unit.

Table 2 is experimental data for L, C _{p, and} SRF of the coil component 1000 according to an embodiment of the present invention.

Referring to Table 1, Table 2 and FIG. 11, like the coil part 1000 according to the embodiment of the present invention, the coil parts 300 and 400 are connected in series and arranged in the body 100, and the first lead-out part ( 610) in between, compared to the case of one coil unit, even if the L value is kept the same, the effect of increasing the SRF (Self-Resonant Frequency) due to the reduction of the total parasitic capacitance (C _p ) can be confirmed. there is.

Referring to the graph of FIG. 11, in a structure in which a coil part having two coil parts connected in series has a higher SRF (Self-Resonant Frequency) than a coil part having only one coil part, and a dummy draw part is further added thereto It can be seen that it represents the highest SRF (Self-Resonant Frequency).

Specifically, when compared to a general coil component having one coil unit and no dummy draw-out unit, the coil component 1000 according to the embodiment of the present invention has an effect of reducing parasitic capacitance (C _p ) of the entire component by 42.6%. As a result, the effect of increasing the Self-Resonant Frequency (SRF) by 24.5% was confirmed. In the course of the experiment, some error occurred in the L value of the coil component to be compared, but if the L value is assumed to be the same value, it can be seen that the SRF (Self-Resonant Frequency) increases by 33%.

Therefore, as in the present invention, through the structure of the two coil parts 300 and 400 connected in series and the dummy pull-out parts 610 and 620 disposed therebetween, even when the driving frequency is high, component characteristics can be maintained, A coil component having a high SRF (Self-Resonant Frequency) can be provided.

As above, the embodiments of the present invention have been described, but those skilled in the art can add, change, or delete components within the range not departing from the spirit of the present invention described in the claims. It will be possible to modify and change the invention in various ways, which will also be said to be included within the scope of the present invention.

100: body
110: first core, 120: second core
200: substrate
300: first coil unit
311: first coil pattern, 312: second coil pattern
320: first via
330: first drawing unit
340: first connection
400: second coil unit
411: third coil pattern, 412: fourth coil pattern
420: second via
430: second drawing unit
440: second connection part
510: first external electrode, 520: second external electrode
610: first dummy draw-out unit, 620: second dummy draw-out unit
IF: insulating film
1000, 2000: coil parts

Claims (11)

A body having one side and the other side facing each other, first and second cores having first and second cores spaced apart from each other, having one side and the other side facing each other and connecting the one side and the other side;
a substrate disposed within the body;
first and second coil units disposed on the substrate and wound around the first and second cores, respectively;
a first dummy pull-out unit disposed between the first and second coil units to connect the first and second coil units, and having both ends exposed to one side and the other side of the body, respectively; and
first and second external electrodes spaced apart from each other on the body and connected to the first and second coil units, respectively; including,
coil parts.
According to claim 1,
The first coil part,
First and second coil patterns disposed on both surfaces of the substrate facing each other, first vias penetrating the substrate and connecting inner ends of the first and second coil patterns, the first coil pattern and the first via 1 including a first lead-out portion connecting external electrodes and a first connection portion connecting the second coil pattern and the first dummy draw-out portion;
The second coil part,
third and fourth coil patterns disposed on both surfaces of the substrate facing each other, second vias penetrating the substrate and connecting inner ends of the third and fourth coil patterns, the third coil pattern and the first via; A second connection part connecting one dummy draw-out part, and a second draw-out part connecting the fourth coil pattern and the second external electrode,
coil parts.
According to claim 2,
The first and second coil patterns have a planar spiral shape forming at least one turn around the first core,
The third and fourth coil patterns have a flat spiral shape forming at least one turn around the second core,
coil parts.
According to claim 2,
The first dummy pullout is disposed on one surface of the substrate and is connected to the second and third coil patterns, respectively.
coil parts.
According to claim 1,
The first dummy drawing part has a bar shape and is disposed perpendicular to the drawing direction of the first and second coil parts.
coil parts.
According to claim 1,
The first dummy draw-out part includes a conductive metal material,
coil parts.
According to claim 6,
The conductive metal material is copper (Cu),
coil parts.
According to claim 2,
Further comprising a second dummy lead-out part disposed on the other surface of the substrate and spaced apart from the first and fourth coil patterns, respectively.
coil parts.
According to claim 8,
The second dummy drawing part has a bar shape and is disposed perpendicular to the drawing direction of the first and second coil parts.
coil parts.
According to claim 8,
The second dummy draw-out part includes a conductive metal material,
coil parts.
According to claim 10,
The conductive metal material is copper (Cu),
coil parts.

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