KR20160026940A - Coil component - Google Patents

Abstract

The present invention provides a coil component comprising: a body in which a plurality of coil portions are arranged; and an external electrode disposed on an outer peripheral surface of the body and connected to the coil portion, wherein the coil portions comprise: an external layer part including a first coil portion having a lead exposed to a first surface of the body and a second coil portion having a lead exposed to a second surface facing the first surface; and an internal layer part comprising two or more third coil portions disposed inside the external layer.

Description

Coil component {Coil component}

The present invention relates to a coil component.

An inductor, which is one of the coil components, is a typical passive element that removes noise by forming an electronic circuit together with a resistor and a capacitor. The inductor is a passive element that amplifies a signal of a specific frequency band in combination with a capacitor using electromagnetic characteristics. And is used in a configuration such as a filter circuit.

In recent years, there has been an increasing demand for downsizing and slimming of coil parts.

However, it is becoming difficult to realize high inductance and high direct current superimposition characteristics depending on the miniaturized volume.

Further, in order to increase the capacity of the inductor, the coil thickness tends to be thinned as much as possible and the coil turn number tends to increase.

As the thickness of the coil becomes thinner, the non-uniformity of the coil shape and the process scatter are largely issued, which directly affects the yield of the inductor.

In addition, as the number of turns of the coil increases, the area of the core portion in the coil becomes smaller. As a result, the saturation current, which is a main characteristic factor of the inductor, is lowered, Which is a cause of deterioration.

That is, research is needed to maximize the area of the core portion inside the coil as compared with the conventional inductor products.

Japanese Patent Application Laid-Open No. 2006-278479

The present invention is to provide a coil part that meets the requirements of miniaturization and high capacity.

An embodiment of the present invention includes a body having a plurality of coil portions disposed therein and an outer electrode disposed on an outer circumferential surface of the body and connected to the coil portion and the plurality of coil portions are exposed to the first surface of the body An outer layer portion including a first coil portion having a lead to be exposed to the first surface, a second coil portion having a lead exposed to a second surface facing the first surface, and at least two third coil portions disposed inside the outer layer portion A coil component comprising an inner layer portion is provided.

According to an embodiment of the present invention, a coil portion of a multi-layer structure is introduced to increase the number of coil turns, and at the same time, it is possible to secure the area of the core portion, thereby achieving a saturation current higher than the conventional one.

In addition, the number of coil turns can be increased by introducing a coil portion of a multi-layered structure, thereby realizing a coil component of high inductance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an external electrode and a body of a coil component according to an embodiment of the present invention. FIG.
2 is an exploded perspective view of FIG.
3 is a sectional view taken along the line II 'in FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying 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.

Furthermore, embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements.

Coil parts

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an external electrode and a body of a coil component according to an embodiment of the present invention. FIG.

1, a coil component 100 according to an embodiment of the present invention includes a body 50 having a plurality of coil parts 41, 42, 43, and 44 disposed therein, And outer electrodes 81 and 82 connected to the coil portions 41, 42, 43, and 44, respectively.

The body 50 may have a roughly hexahedral shape, and L, W, and T shown in FIG. 1 indicate the longitudinal direction, the width direction, and the thickness direction, respectively.

The body 50 may include a first surface and a second surface opposed to each other in the longitudinal direction, a third surface and a fourth surface opposed in the width direction, and a fifth surface and a sixth surface opposed to each other in the thickness direction. The body 50 may have a rectangular parallelepiped shape whose length in the longitudinal direction is greater than the length in the width direction.

The body 50 forms an outer appearance of the coil component 100 and may be formed by filling a magnetic material showing magnetic characteristics.

The magnetic material is not limited as long as it exhibits magnetic properties, and may be, for example, ferrite or a metal-based soft magnetic material.

The ferrite may include ferrite such as Mn-Zn ferrite, Ni-Zn ferrite, Ni-Zn-Cu ferrite, Mn-Mg ferrite, Ba ferrite or Li ferrite.

The soft magnetic material may be an alloy including at least one selected from the group consisting of Fe, Si, Cr, Al and Ni, and may include, for example, Fe-Si-B-Cr amorphous metal particles But is not limited thereto.

The metal-based soft magnetic material may have a particle diameter of 0.1 to 20 μm and may be dispersed on a polymer such as an epoxy resin or polyimide.

The thickness of the body 50 may be 1.2 mm or less, but it is not limited thereto and may be manufactured in various thicknesses.

A coil component according to an embodiment of the present invention includes first and second external electrodes 81 and 82 connected to the coil portions 41 and 42 and disposed on the outer surface of the body 50 .

The first and second external electrodes 81 and 82 may be formed of a metal having excellent electrical conductivity and may be formed of a metal such as silver (Ag), copper (Cu), nickel (Ni), aluminum (Al) Or the like.

Hereinafter, the coil portions 41, 42, 43, and 44 and the first and second external electrodes 81 and 82 will be described.

2 is an exploded perspective view of FIG.

2, the plurality of coil parts 41, 42, 43, and 44 include a first coil part 41 having a lead 41 'exposed to the first surface of the body 50, An outer layer portion including a second coil portion 42 having a lead 42 'exposed through a second surface facing the first surface and two or more third coil portions 43 and 44 disposed inside the outer layer portion, As shown in Fig.

One end of each of the first and second coil portions 41 and 42 is connected to a lead 41 'and 42', respectively, which are exposed to a first surface of the body 50 and a second surface facing the first surface, And the other end of the first coil portion 41 is connected to the other end of the coil portion 43 of one of the third coil portions 43 and 44 in the body 50 via vias 45 And the other end of the second coil portion 42 is connected to the other end of the coil portion 44 of one of the third coil portions 43 and 44 by a via 45 inside the body 50.

The third coil portions 43 and 44 are disposed in the body 50 and are disposed inside the body 50. The third coil portions 43 and 44 increase the number of turns of the entire coil without being exposed to the outside.

In FIG. 2, two third coil portions 43 and 44 are disposed, but the present invention is not limited thereto, and three or more third coil portions 43 and 44 may be disposed.

According to the embodiment of the present invention, unlike the conventional coil part, the outer coil part composed of the first coil part and the second coil part 41, 42 is composed of two or more third coil parts 43, 44 By arranging the inner layer portion, it is possible to increase the number of turns of the coil portion while ensuring the largest possible area of the core portion, thereby realizing high inductance.

In addition, by introducing a coil portion of a multi-layered structure, it is possible to increase the number of coil turns and ensure the area of the core portion, thereby achieving a higher saturation current than the conventional one.

An insulating layer 21 may be disposed between each of the plurality of coil parts 41, 42, 43, and 44.

The insulating layer 21 basically electrically insulates the coil portions formed on the different layers.

In the insulating layer 21, vias 45 are formed, through which the coil portions formed in the different layers are electrically connected.

The material of the insulating layer 21 may be any material including an insulating material. For example, a resin impregnated with a reinforcing material such as a glass fiber or an inorganic filler, for example, a prepreg may be used, and a conventional thermosetting resin and / or photo-curable resin, which may or may not include a reinforcing material, Up film may be used.

In addition, a known positive type or negative type photosensitive resin may be used. However, the present invention is not limited thereto.

The via 45 formed in the insulating layer 21 includes a metal having excellent electrical conductivity and may be formed of a metal such as silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni) , Gold (Au), copper (Cu), platinum (Pt), or an alloy thereof, but is not limited thereto.

The shape and size of the vias are not particularly limited, and can be variously applied according to design specifications.

The substrate 23 may be disposed between the two third coil parts 43, 44 at two or more third coil parts 43, 44 corresponding to the inner part.

That is, the two third coil portions 43 and 44 may be formed on the upper surface and the lower surface of the substrate 23, respectively, and may be connected to each other via vias.

The substrate 23 may be formed of a thin film, for example, a PCB substrate, a ferrite substrate, a metal soft magnetic substrate, or the like.

The central portion of the insulating substrate 23 penetrates to form a hole, and the hole may be filled with a magnetic material such as ferrite or a metal-based soft magnetic material to form a core portion. The inductance (L) can be improved by forming the core portion filled with the magnetic body.

The first to third coil portions 41, 42, 43, and 44 may include at least one selected from the group consisting of gold, silver, platinum, copper, nickel, palladium, and alloys thereof.

The first to third coil portions 41, 42, 43, and 44 may be made of a material capable of imparting conductivity to the coil, and the present invention is not limited thereto.

The first to third coil portions 41, 42, 43, and 44 may be polygonal, circular, elliptical, or irregular, and the shape is not particularly limited.

The first coil part and the second coil part 41 and 42 may be connected to the first and second external electrodes 81 and 82 through leads, respectively.

The first and second external electrodes 81 and 82 may be formed on the side of the body 50 in the longitudinal direction (" L direction ").

The first and second external electrodes 81 and 82 may be separated from each other and electrically separated from each other.

The first and second external electrodes 81 and 82 may extend to a top surface and a bottom surface of the body 50, respectively.

The first external electrode 81 may be used as an input terminal, and the second external electrode 82 may be used as an output terminal.

3 is a sectional view taken along line I-I 'of Fig.

Referring to FIG. 3, in the coil part according to the embodiment of the present invention, the two or more third coil parts 43, 44 constituting the inner layer part have a shape similar to the width direction growth degree and the thickness direction growth degree .

That is, the two or more third coil portions 43, 44 constituting the inner layer portion may be an isotropic growth plating layer.

As described above, the two or more third coil portions 43 and 44 constituting the inner layer portion are formed of an isotropic growth plating layer having the same degree of growth in the width direction and in the thickness direction, thereby reducing the thickness difference between the adjacent coils, So that the direct current resistance (Rdc) scattering can be reduced.

Further, by forming the third coil portions 43 and 44 as an isotropic growth plating layer, the third coil portions 43 and 44 can be formed straight without being bent, thereby preventing a short between adjacent coils, It is possible to prevent the defect that the insulating film is formed on a part of the insulating films 43 and 44.

According to one embodiment of the present invention, the first coil part and the second coil part (41, 42) constituting the outer layer part are formed on the isotropic growth plating layer exhibiting a similar degree of widthwise growth degree and thickness- The anisotropic growth plating layer whose growth is inhibited and which exhibits a remarkably large degree of growth in the thickness direction can be further disposed.

That is, the first coil part and the second coil part 41, 42 constituting the outer layer part are formed in the shape of an isotropic growth plating layer and an isotropic growth plating layer formed on the upper part of the isotropic growth plating layer so that the growth in the width direction is suppressed and the anisotropic growth plating layer Respectively.

As described above, the first coil part and the second coil part constituting the outer layer part are formed such that the growth in the width direction is suppressed and the growth in the thickness direction is remarkably large on the upper part of the isotropic growth plating layer, By further forming the anisotropic growth plating layer, the cross-sectional area of the coil conductor can be further increased to improve the DC resistance Rdc and the inductance Ls characteristics.

In addition, the first coil part and the second coil part constituting the outer layer part are formed such that the width direction growth is suppressed and the thickness direction growth is remarkably large on the upper portion of the isotropic growth plating layer, By further forming the anisotropic growth plating layer, it is possible to further increase the cross-sectional area of the coil conductor while preventing a short between adjacent coils.

The aspect ratio AR of the first coil part and the second coil part 41 according to the embodiment of the present invention thus formed may be 3.0 or more.

According to an embodiment of the present invention, the first and second coil parts 41 and 42 constituting the outer layer part are provided with a thin film polymer coating a first coil part and a second coil part 41, An insulating film 25 may be formed.

The surface of the thin film polymer insulating film 25 may be formed along the shapes of the surfaces of the first coil part and the second coil part 41, 42.

As shown in FIG. 3, the shape of the surface of the thin film polymer insulating film 25 is the same as that of the first coil part and the second coil part 41 , 42) is formed to be thinly coated in the shape of the surface.

The thin film polymer insulating film 25 is also formed up to the lower portion of the coil along the shapes of the surfaces of the first coil portion and the second coil portions 41 and 42 so that the exposed portions of the first coil portion and the second coil portions 41 and 42 It is possible to prevent the generation of leakage current and the defective waveform.

As described above, the thin film polymer insulating film 25 according to an embodiment of the present invention can be formed by a chemical vapor deposition (CVD) method or a dipping method using a polymer coating liquid having a low viscosity.

The thin film polymer insulating film 25 may be formed to a thickness of 3 탆 or less, more preferably 1 탆 to 3 탆.

If the thin film polymer insulating film 25 is formed to have a thickness of less than 1 탆, the insulating film may be broken during the lamination and pressing process of the magnetic material layer, resulting in a bad waveform due to contact with the external magnetic material. The volume occupied by the magnetic body decreases as the number of the magnetic bodies increases, which may cause a limit in improving the inductance.

The thin-film polymer insulating film 25 can be uniformly formed so that the thickness deviation is 1 m or less. The thickness deviation refers to the difference between the last film portion and the thin film portion in the thin film polymer insulating film 25 coated on each coil pattern when the cross section of the first coil portion and the second coil portion 41 is observed.

If the thickness deviation of the thin film polymer insulating film 25 is more than 1 mu m, the insulating film may be broken or the exposed portions of the first coil portion and the second coil portion 41 may be generated during the lamination and pressing process of the magnetic layer, Waveform defects due to contact with the material may occur.

The thin film polymer insulating film 25 is formed of a material such as poly (p-xylylene), epoxy resin, polyimide resin, phenoxy resin, polysulfone resin Or a polycarbonate resin, or the like, and is not particularly limited thereto.

The number of turns of the third coil part 43, 44 may be the same as the number of turns of the first and second coil parts 41, 42.

By setting the number of turns of the third coil portions 43 and 44 equal to the number of turns of the first and second coil portions 41 and 42, an internal area equivalent to the cutting margin can be ensured and high inductance can be realized However, the number of coil turns increases, so that a high inductance can be realized.

According to an embodiment of the present invention, the magnetic substance sheet 11 is laminated, pressed and cured on the upper and lower portions of the first and second coil sections 41 and 42 to form the body 50.

The present invention is not limited to the above-described embodiments and the accompanying drawings, but is intended to be limited only by the appended claims. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

100: coil part 50: body
11: magnetic substance sheet 21: insulating layer
23: substrate 25: insulating film
41, 42, 43, 44: first to third coil portions
81, 82: first and second outer electrodes

Claims (8)

A body having a plurality of coil portions disposed therein; And
And an external electrode disposed on an outer circumferential surface of the body and connected to the coil portion,
Wherein the plurality of coil portions include an outer layer portion including a first coil portion having a lead exposed to a first surface of the body, a second coil portion having a lead exposed to a second surface facing the first surface, And an inner layer portion composed of two or more third coil portions disposed inside the portion.
The method according to claim 1,
And the other end of the first coil part and the other end of the third coil part are connected via a via.
The method according to claim 1,
And the other end of the second coil part and the other end of the third coil part are connected via a via.
The method according to claim 1,
Wherein the number of turns of the third coil part is equal to the number of turns of the first and second coil parts.
The method according to claim 1,
And a substrate is inserted between the third coil part.
The method according to claim 1,
And an insulating layer is disposed between each of the plurality of coil parts.
The method according to claim 1,
Wherein the first and second coil portions are further structured such that an isotropic growth plating layer and an anisotropic growth plating layer in which growth in the width direction is suppressed and growth in the thickness direction is remarkably larger are further disposed on the isotropic growth plating layer.
The method according to claim 1,
And the third coil portion is an isotropic growth plating layer.

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