This application claims benefit of priority to Korean Patent Application No. 10-2022-0135931 filed on Oct. 20, 2022 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.
The present disclosure relates to a coil component.
An inductor, a coil component, is a representative passive electronic component used in an electronic device together with a resistor and a capacitor.
As electronic devices gradually become more sophisticated and miniaturized, the number of electronic components used in electronic devices is also increased and their sizes are miniaturized.
In order to implement a coil component with high capacity and high efficiency even in a small package, there is a demand for a coil structure in which a central core of a coil has a larger area.
An aspect of the present disclosure may provide a coil component with an improved saturation current (Isat) characteristic in which a central core of a coil has a larger area to thus facilitate a flow of magnetic flux.
Another aspect of the present disclosure may provide a coil component suppressing a side effect which is caused by the condition that direct current (DC) resistance Rdc is increased due to a reduced cross-sectional area of a lead portion.
According to some embodiments of the present disclosure, a coil component may include: a body having a first surface and a second surface opposing each other in a first direction, and a third surface and a fourth surface opposing each other in a second direction, perpendicular to the first direction; a support member disposed in the body; a coil disposed on the support member, and including a coil pattern having at least one turn and a lead portion extending from the coil pattern to at least one of the first surface and second surface of the body; and an external electrode disposed on the body and connected to the lead portion, wherein a partial region of an outermost turn of the coil pattern has a line width smaller than that of the other region, and at least one of the lead portions is off-centered and disposed on one side of the body based on a center line passing through a center of the coil pattern while being parallel to the first direction.
The above and other aspects, features and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
Hereinafter, exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.
In the drawings, an L direction refers to a first direction or length direction, a W direction refers to a second direction or width direction, and a T direction refers to a third direction or thickness direction.
Hereinafter, a coil component according to exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the exemplary embodiments of the present disclosure with reference to the accompanying drawings, components that are the same as or correspond to each other will be denoted by the same reference numerals, and an overlapping description thereof will be omitted.
Various kinds of electronic components may be used in an electronic device, and various kinds of coil components may be appropriately used between these electronic components depending on their purposes in order to remove noise or the like.
That is, the coil component used in the electronic device may be a power inductor, high frequency (HF) inductor, a general bead, a bead for a high frequency (GHz), a common mode filter, or the like.
Meanwhile, the drawings omit an insulating layer disposed on a body 100 that is applied to this exemplary embodiment to more clearly show coupling between components.
Referring to
The body 100 may form an exterior of the coil component 1000 according to this exemplary embodiment, and may embed the support member 200 and the coil 300.
The body 100 may generally have a hexahedral shape.
The body 100 may include a first surface 101 and a second surface 102 opposing each other in the length (L) direction or first direction, a third surface 103 and a fourth surface 104 opposing each other in the width (W) direction or second direction, and a fifth surface 105 and a sixth surface 106 opposing each other in the thickness (T) direction or third direction. Each of the first to fourth surfaces 101, 102, 103, and 104 of the body 100 may correspond to a wall surface of the body 100 that connects the fifth and sixth surfaces 105 and 106 of the body 100 to each other.
For example, the body 100 may be formed for the coil component 1000 according to this exemplary embodiment including the external electrodes 400 and 500 described below to have: a length of 2.5 mm, a width of 2.0 mm, and a thickness of 1.0 mm; a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.65 mm; a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.8 mm; a length of 1.0 mm, a width of 0.5 mm, and a thickness of 0.8 mm; or a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.65 mm. However, the present disclosure is not limited thereto. Meanwhile, the above exemplary dimensions for the length, width, and thickness of the coil component 1000 may be dimensions that do not reflect process errors, and a range of the dimensions recognized to include the process errors may thus fall within that of the above-described exemplary dimensions.
The above length of the coil component 1000 may indicate the maximum value of respective dimensions of a plurality of line segments spaced apart from each other in the thickness (T) direction, and connecting two outermost boundary lines opposing each other in the length (L) direction of the coil component 1000 shown in the following image to be parallel to the length (L) direction, based on the optical microscope image or scanning electron microscope (SEM) image of a cross-section of the coil component 1000 in a length (L)-thickness (T) direction that is taken from its center in the width (W) direction. Alternatively, the length of the coil component 1000 may indicate the minimum value of the respective dimensions of the plurality of line segments described above. Alternatively, the length of the coil component 1000 may indicate an arithmetic average value of at least three of the respective dimensions of the plurality of line segments described above. Here, the plurality of line segments parallel to the length (L) direction may be equally spaced from each other in the thickness (T) direction, and the scope of the present disclosure is not limited thereto.
The above thickness of the coil component 1000 may indicate the maximum value of respective dimensions of a plurality of line segments spaced apart from each other in the length (L) direction, and connecting two outermost boundary lines opposing each other in the thickness (T) direction of the coil component 1000 shown in the following image to be parallel to the thickness (T) direction, based on the optical microscope image or scanning electron microscope (SEM) image of the cross-section of the coil component 1000 in the length (L)-thickness (T) direction that is taken from its center in the width (W) direction. Alternatively, the thickness of the coil component 1000 may indicate the minimum value of the respective dimensions of the plurality of line segments described above. Alternatively, the thickness of the coil component 1000 may indicate an arithmetic average value of at least three of the respective dimensions of the plurality of line segments described above. Here, the plurality of line segments parallel to the thickness (T) direction may be equally spaced from each other in the length (L) direction, and the scope of the present disclosure is not limited thereto.
The above width of the coil component 1000 may indicate the maximum value of respective dimensions of a plurality of line segments spaced apart from each other in the length (L) direction, and connecting two outermost boundary lines opposing each other in the width (W) direction of the coil component 1000 shown in the following image to be parallel to the width (W) direction, based on the optical microscope image or scanning electron microscope (SEM) image of a cross-section of the coil component 1000 in a length (L)-width (W) direction that is taken from its center in the thickness (T) direction. Alternatively, the width of the coil component 1000 may indicate the minimum value of the respective dimensions of the plurality of line segments described above. Alternatively, the width of the coil component 1000 may indicate an arithmetic average value of at least three of the respective dimensions of the plurality of line segments described above. Here, the plurality of line segments parallel to the width (W) direction may be equally spaced from each other in the length (L) direction, and the scope of the present disclosure is not limited thereto.
Alternatively, each of the length, width and thickness of the coil component 1000 may be measured using a micrometer measurement method. The micrometer measurement method may be used by setting a zero point with a micrometer using a repeatability and reproducibility (Gage R&R), inserting the coil component 1000 according to this exemplary embodiment between tips of the micrometer, and turning a measurement lever of the micrometer. Meanwhile, when measuring the length of the coil component 1000 by using the micrometer measurement method, the length of the coil component 1000 may indicate a value measured once or an arithmetic average of values measured several times. This method may be equally applied to measure the width or thickness of the coil component 1000.
The body 100 may include a magnetic material and a resin. In detail, the body 100 may be formed by laminating one or more magnetic composite sheets in which the magnetic material is dispersed in the resin. However, the body 100 may also have a structure other than the structure in which the magnetic material is dispersed in the resin. For example, the body 100 may be made of a magnetic material such as ferrite or a non-magnetic material.
The magnetic material may include the ferrite or metal magnetic powders.
The ferrite may include, for example, at least one of a spinel type ferrite such as Mg—Zn-based ferrite, Mn—Zn-based ferrite, Mn—Mg-based ferrite, Cu—Zn-based ferrite, Mg—Mn—Sr-based ferrite or Ni—Zn-based ferrite, a hexagonal type ferrite such as Ba—Zn-based ferrite, Ba—Mg-based ferrite, Ba—Ni-based ferrite, Ba—Co-based ferrite or Ba—Ni—Co-based ferrite, a garnet type ferrite such as Y-based ferrite, and Li-based ferrite.
The metal magnetic powders may include at least one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu) and nickel (Ni). For example, the metal magnetic powders may be at least one or more of pure iron powders, Fe—Si-based alloy powders, Fe—Si—Al-based alloy powders, Fe—Ni-based alloy powders, Fe—Ni—Mo-based alloy powders, Fe—Ni—Mo—Cu-based alloy powders, Fe—Co-based alloy powders, Fe—Ni—Co-based alloy powders, Fe—Cr-based alloy powders, Fe—Cr—Si-based alloy powders, Fe—Si—Cu—Nb-based alloy powders, Fe—Ni—Cr-based alloy powders, and Fe—Cr—Al-based alloy powders.
The metal magnetic powders may be amorphous or crystalline. For example, the metal magnetic powders may include Fe—Si—B—Cr-based amorphous alloy powders, and are not necessarily limited thereto.
The ferrite and the metal magnetic powders may respectively have average diameters of about 0.1 μm to 30 μm, but the present disclosure is not limited thereto.
The body 100 may include two or more types of magnetic materials dispersed in the resin. Here, different types of magnetic materials may indicate that the magnetic materials dispersed in the resin are distinguished from each other by any one of an average diameter, a composition, crystallinity, and a shape.
The resin may include an epoxy, a polyimide, a liquid crystal polymer (LCP), or the like, or mixtures thereof, but the present disclosure is not limited thereto.
The body 100 may include a core 110 passing through the support member 200 and the coil 300, described below. The core 110 may be formed by filling a through hole of the support member 200 with the magnetic composite sheet, but the present disclosure is not limited thereto.
The support member 200 may be disposed in the body 100. The support member 200 is a component supporting the coil 300 described below. Meanwhile, the support member 200 may be excluded in some exemplary embodiments, such as a case where the coil 300 correspond to a wound coil or has a coreless structure.
The support member 200 may be made of an insulating material including thermosetting resin such as an epoxy resin, a thermoplastic insulating resin such as polyimide, or a photosensitive insulating resin, or may be made of an insulating material having a reinforcement material such as a glass fiber or an inorganic filler impregnated in the insulating resin. For example, the support member 200 may be made of a material such as prepreg, an Ajinomoto Build-up Film (ABF), FR-4, bismaleimide triazine (BT) resin, a photo imagable dielectric (PID) or a copper clad laminate (CCL), but the present disclosure is not limited thereto.
The inorganic filler may use at least one or more materials selected from the group consisting of silica (or silicon dioxide, SiO2), alumina (or aluminum oxide, Al2O3), silicon carbide (SiC), barium sulfate (BaSO4), talc, clay, mica powders, aluminum hydroxide (Al(OH)3), magnesium hydroxide (Mg(OH)2), calcium carbonate (CaCO3), magnesium carbonate (MgCO3), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO3), barium titanate (BaTiO3), and calcium zirconate (CaZrO3).
Here, when made of the insulating material including the reinforcing material, the support member 200 may have more excellent rigidity. The support member 200 may be made of the insulating material including no glass fiber. In this case, an entire thickness of the support member 200 and the coil 300 (indicating a sum of the respective dimensions of the coil 300 and the support member 200 in the third or T direction of
The coil 300 may be disposed on the support member 200. The coil 300 may be embedded in the body 100 to express a characteristic of the coil component. For example, when the coil component 1000 of this exemplary embodiment is used as the power inductor, the coil 300 may store an electric field as a magnetic field to maintain an output voltage, thereby stabilizing power of the electronic device.
The coil 300 may be disposed on at least one of both surfaces of the support member 200 that oppose each other, and have at least one turn. In this exemplary embodiment, the coil 300 may include first and second coil patterns 311 and 312, the via 320, and first and second lead portions 331 and 332.
Referring to
Referring to
Referring to
Referring to
Referring to
Referring to
Referring to
In the first and second coil patterns 311 and 312 disposed on both the surfaces of the support member 200, respectively, the first cut portion 311a and 312a may be spaced apart from the first and second lead portions 331 and 332, respectively, and the second cut portion 311b and 312b may be adjacent to the lead portion 331 or 332, respectively. For example, referring to
Referring to
Referring to
Referring to
Through this structure in which the first or second lead portion 331 or 332 is off-centered and disposed on one side of the body based on the center line CL, the coil pattern 311 or 312 may be disposed more outward in a coil component of the same size when compared to a case where the lead portion 331 or 332 is disposed on the center line CL. As a result, the core 110 may have a larger cross-sectional area, thereby improving the inductance characteristic of the coil component 1000.
Referring to
Referring to
In addition, the lead portion 331 or 332 of this exemplary embodiment may be spaced apart from the center line CL in the second or W direction. That is, the center of the surface where the lead portion 331 or 332 is exposed to the body 100 may be spaced apart from the center line CL, while the outermost boundary line of the lead portion 331 or 332 is completely spaced from the center line CL. For example, referring to
Referring to
Through the structure of the present embodiments, it is possible to increase a contact area between the first or second lead portion 331 and 332 and the external electrode 400 and 500, respectively, thereby reducing direct current (DC) resistance Rdc of the coil 300, and improving an adhesion strength of the lead portion with the external electrode 400 or 500.
Referring to
At least one of the coil patterns 311 and 312, the via 320, and the lead portions 331 and 332 may include at least one conductive layer.
For example, the first coil pattern 311, the via 320, and the first lead portion 331 may be plated on the lower surface of the support member 200 (based on the directions shown in
Each of the coil patterns 311 and 312, the via 320, and the lead portions 331 and 332 may be formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo) or an alloy thereof, but the present disclosure is not limited thereto. Meanwhile, the cut portion 311a, 311b, 312a, or 312b may be patterned using a plating resist when the first or second coil pattern 311 or 312 is plated, but the present disclosure is not limited thereto, and may be formed by removing a predetermined region after forming the coil pattern 311 or 312.
The first and second external electrodes 400 and 500 may respectively be disposed on the first surface 101 and the second surface 102 of the body 100, and respectively connected to the first and second lead portions 331 and 332. In detail, the first external electrode 400 may be disposed on the first surface 101 of the body 100 and in contact with the first lead portion 331. In addition, the second external electrode 500 may be disposed on the second surface 102 of the body 100 and in contact with the second lead portion 332.
The external electrodes 400 and 500 may electrically connect the coil component 1000 to a printed circuit board or the like when the coil component 1000 according to this exemplary embodiment is mounted on the printed circuit board or the like. For example, each of the external electrodes 400 and 500 disposed on the first surface 101 and second surface 102 of the body 100 while being spaced apart from each other may be electrically connected to a connection part of the printed circuit board.
The external electrode 400 or 500 may be made of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Cr), titanium (Ti), or an alloy thereof, but the present disclosure is not limited thereto.
Each of the external electrodes 400 and 500 may include a plurality of layers. For example, the first external electrode 400 may include a first layer in contact with the first lead portion 331 and a second layer disposed on the first layer. Here, the first layer may be a conductive resin layer including conductive powders including at least one of copper (Cu) or silver (Ag) and insulating resin, or may be a copper (Cu) plating layer. The second layer may have a double layer structure of a nickel (Ni) plating layer and/or a tin (Sn) plating layer.
Referring to
Meanwhile, the coil component 1000 according to this exemplary embodiment may further include an insulating layer disposed in a region other than the regions where the external electrodes 400 and 500 are disposed while covering the third to sixth surfaces 103, 104, 105, and 106 of the body 100.
The insulating layer may be formed, for example, by coating and curing an insulating material including the insulating resin on the surface of the body 100. In this case, the insulating layer may include at least one of thermoplastic resin such as polystyrene-based resin, vinyl acetate-based resin, polyester-based resin, polyethylene-based resin, polypropylene-based resin, polyamide-based resin, rubber-based resin, acrylic-based resin, thermosetting insulating resin such as phenol-based resin, epoxy-based resin, urethane-based resin, melamine-based resin, or alkyd-based resin, or the photosensitive insulating resin.
When comparing
Therefore, in describing this exemplary embodiment, the corner portion 311c or 312c, which is different from the configuration in a first exemplary embodiment of the present disclosure, is only described, and the descriptions of the other components in a first exemplary embodiment of the present disclosure may be equally applied to descriptions of those in this exemplary embodiment.
Referring to
Here, the maximum line width of the outermost turn of the coil pattern 311 or 312 may indicate, for example, the maximum value of the respective dimensions of the plurality of line segments spaced apart from each other and connecting the respective boundaries of the inner surface IS and outer surface OS of the coil pattern 311 or 312 shown in the following image, based on the optical microscope image or scanning electron microscope (SEM) image of the cross-section of the coil pattern 311 or 312 of the coil component 1000 in the length (L)-width (W) direction that is taken from its center in the thickness (T) direction. However, the scope of the present disclosure is not limited thereto.
Referring to
The outermost turn of the first coil pattern 311 may include at least one corner portion 311c1, 311c2 or 311c3 disposed in a region adjacent to a corner of the body 100, or the outermost turn of the second coil pattern 312 may include at least one corner portion 312c1, 312c2 or 312c3.
In detail, the corner portion 311c1, 311c2 and 311c3 may be disposed in a region spaced apart from the first lead portion 331 or the corner portion 312c1, 312c2 and 312c3 may be disposed in a region spaced apart from the second lead portion 332 among diagonal regions where the corners of the body 100 formed by the first to fourth surfaces 101, 102, 103, and 104 of the body 100 are connected to each other, on the cross-section of the first or second coil pattern 311 or 312 that is perpendicular to its coil axis. For example, referring to
Referring to
Referring to
Here, the distance between the corner of the body 100 and the corner portion 311c1, 311c2, 311c3, 312c1, 312c2, or 312c3 may indicate, for example, the minimum value of respective dimensions of a plurality of line segments spaced apart from each other and connecting a tangent of the outer surface of the outermost turn of the coil pattern 311 or 312 with the corner of the body 100 shown in the following image, based on the optical microscope image or scanning electron microscope (SEM) image of the cross-section of the coil pattern 311 or 312 of the coil component 1000 in the length (L)-width (W) direction that is taken from its center in the thickness (T) direction. Alternatively, this distance on the image may be measured using a program of image J, but the present disclosure is not limited thereto.
The corner portions 311c1, 311c2, 311c3, 312c1, 312c2, and 312c3 may include the first to third corner portions 311c1, 311c2, 311c3, 312c1, 312c2, and 312c3 sequentially disposed in the directions in which the outermost turns of the first and second coil patterns 311 and 312 are wound from the outside, where closer to the body, to the inside, where closer to the core. In detail, the first coil pattern 311 may include the first to third corner portions 311c1, 311c2, and 311c3, sequentially disposed in the direction in which its outermost turn is wound from the outside to the inside. In detail, the second coil pattern 312 may include the first to third corner portions 312c1, 312c2, and 312c3, sequentially disposed in the direction in which its outermost turn is wound from the outside to the inside.
The coil component 2000 according to this exemplary embodiment may include the corner portion 311c1, 311c2, 311c3, 312c1, 312c2, and 312c3 of the outermost turn of the first or second coil pattern 311 or 312, and each of the corner portion 311c1, 311c2, 311c3, 312c1, 312c2, and 312c3 may have the large line width LW3′ to thus lower the Rdc, thereby offsetting the Rdc characteristic deterioration (or Rdc increase) occurring due to the formation of the cut portion 311a, 311b, 312a, or 312b.
When comparing
Therefore, in describing this exemplary embodiments, the number of turns of the first and second coil pattern 311 or 312, the disposition of the via 320, and the area S2 of the remaining area in the support member 200, which are different from those in a first exemplary embodiment of the present disclosure, are only described, and the descriptions of the other components in a first exemplary embodiment in the present disclosure may be equally applied to descriptions of those in this exemplary embodiment.
Referring to
When comparing
On the other hand, in a third exemplary embodiment(shown in
When comparing
Therefore, in describing this exemplary embodiment, the shape of at least one of the first or second lead portion 331 or 332 and the width Wo of the lead surface, which is different from one in the first exemplary embodiment of the present disclosure, is only described, and the descriptions of the other components in the first exemplary embodiment of the present disclosure may be equally applied to descriptions of those in this exemplary embodiment.
Referring to
Through this structure, it is possible to reduce the volume of the lead portion 331 or 332 in the coil component of the same size to thus increase the effective volume in which the magnetic material may be disposed, thereby improving the inductance characteristic.
As set forth above, according to some embodiments of the present disclosure, it is possible to provide the coil component with the improved Isat characteristic in which the central core of the coil has the larger area to thus facilitate the flow of the magnetic flux.
According to some embodiments of the present disclosure, it is possible to provide the coil component with the improved Isat characteristic while minimizing the side effect in which the Rac is increased due to the reduced cross-sectional area of the lead portion.
While the exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present disclosure as defined by the appended claims.
Number | Date | Country | Kind |
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10-2022-0135931 | Oct 2022 | KR | national |