KR20170086348A - Coil component - Google Patents

Abstract

The present invention includes a body including two opposite surfaces facing each other in the thickness direction, two surfaces facing each other in the longitudinal direction, a body including both surfaces facing each other in the width direction, and an external electrode disposed on the external surface of the body, Wherein the non-magnetic region includes a coil pattern portion including a plurality of coil patterns and an insulating portion disposed so as to surround the coil pattern portion, wherein the non-magnetic region includes a non- The length from the innermost coil pattern to the outermost coil pattern in the area is A, the total length of the coil pattern part in the length A is the length B, the total length of the insulation part in the length A is the length C, (C / B) of the length C multiplied by an average width (W) of one coil pattern in the coil pattern portion is a length D, the length C of the length B (C / B), to a coil component that satisfy the C / B <30%.

Description

Coil Components {COIL COMPONENT}

The present invention relates to a coil component, for example, a power inductor and the like.

The inductor, which is one of the coil parts, is a passive element that removes noise by forming an electronic circuit together with a resistor and a capacitor. For example, the power inductor can be used as a power supply circuit or a converter circuit in which a large current flows.

Recently, miniaturization of power inductors has been continuously required according to miniaturization and thinning of mobile products, and high inductance and low resistance value are continuously required to reduce power loss.

The following Patent Document 1 discloses adjusting the inductance value by adjusting the width of the coil differently. The improvement of the inductance and the maintenance of the low resistance value can not be satisfied at the same time.

On the other hand, if the number of revolutions of the coil is increased in order to increase the inductance of the coil component, the area of the nonmagnetic part including the coil increases, thereby suppressing the increase of the inductance and increasing the length of the coil. .

Korean Patent Publication No. 2003-0043645

The present invention provides a coil component having a structure capable of improving resistance characteristics in order to reduce power loss while improving inductance characteristics.

According to an embodiment of the present invention, there is provided an electronic device comprising: a body including two opposite surfaces facing each other in the thickness direction, two surfaces facing each other in the longitudinal direction, a body including both surfaces facing each other in the width direction, and an external electrode disposed on the external surface of the body Provide coil parts. The body includes a magnetic region and a non-magnetic region, and the non-magnetic region includes a coil pattern portion including a plurality of coil patterns and an insulating portion disposed to surround the coil pattern portion. In this case, the length from the innermost coil pattern to the outermost coil pattern in the non-magnetic region is defined as a length A, the total length of the coil pattern portion in the length A is defined as a length B, the length A (C / B) of the length C to the length B and the average width (W) of one coil pattern in the coil pattern portion is the length D, And the ratio (C / B) of the length C to the length B has a value smaller than 30%.

According to another aspect of the present invention, there is provided a liquid crystal display device including a liquid crystal display panel including both sides facing each other in the thickness direction, both sides facing each other in the longitudinal direction, a body including both sides facing each other in the width direction, Coil components. The body includes a magnetic region and a non-magnetic region, and the non-magnetic region includes a coil pattern portion including a plurality of coil patterns and an insulating portion disposed to surround the coil pattern portion. In this case, the length from the innermost coil pattern to the outermost coil pattern in the non-magnetic region is defined as a length A, the total length of the coil pattern portion in the length A is defined as a length B, the length A (C / B) of the length C to the length B and the average width (W) of one coil pattern in the coil pattern portion is the length D, The length D is smaller than a value {(2 x N ^0.4 )} which is twice the square of 0.4 of the number N of revolutions of the coil pattern in the coil pattern portion.

INDUSTRIAL APPLICABILITY The present invention can provide a coil component capable of reducing power loss while improving inductance characteristics and having low resistance characteristics.

The present invention can provide a coil part that can improve the resistance characteristic of the coil part and improve the device efficiency of the electronic part.

The present invention can provide a coil part which can reduce the heat generation even in a current region where use has been limited due to the heat generation of an electronic part including a coil part, thereby enabling use to a higher current range.

1 is a schematic perspective view of a coil component according to an example of the present invention.
2 is a cross-sectional view taken along line I-I 'of FIG.
3 is an enlarged schematic view of the area A in Fig.

Hereinafter, embodiments of the present invention will be described with reference to specific embodiments and the accompanying drawings. However, the embodiments of the present invention can 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.

It is to be understood that, although the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Will be described using the symbols.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, a coil component according to an exemplary embodiment of the present invention will be described, but the present invention is not limited thereto.

Coil parts

FIG. 1 is a schematic perspective view of a coil component according to an exemplary embodiment of the present invention, and FIG. 2 is a sectional view taken along line I-I 'of FIG.

1 and 2, a coil component 100 according to an exemplary embodiment of the present invention includes a body 1 and an external electrode (not shown) disposed on the external surface of the body and electrically connected to a coil pattern embedded in the body 2).

1 and 2, external electrodes are arranged to face each other in the longitudinal direction of the body. However, the present invention is not limited thereto, and the external electrodes may be appropriately arranged according to manufacturing design and manufacturing conditions. The external electrode may be formed using a paste containing a metal having excellent electrical conductivity. For example, the external electrode may be formed of a metal such as nickel (Ni), copper (Cu), tin (Sn) Or the like, and the like. The method of forming the external electrode may be performed by not only printing but also dipping according to the shape of the external electrode.

1 and 2, the body 1 has a first surface, a second surface, and a third surface facing each other in the thickness T direction, a third surface facing the first surface, a fourth surface, a width W, The fifth and sixth surfaces facing each other in the direction of the arrows, but the present invention is not limited thereto.

The body 1 of the coil component according to an exemplary embodiment of the present invention may include a nonmagnetic region 11 including a coil pattern portion and a magnetic region 12 surrounding the surface of the nonmagnetic region.

The nonmagnetic region 11 in the body 1 may include a coil pattern portion 111 and an insulating portion 112 surrounding the outer surface of the coil pattern portion 111. [

The coil pattern portion 111 may have a spiral shape as a whole, but is not limited thereto. Further, the coil pattern portion 111 may have a winding structure or a thin film structure, but the present invention is not limited thereto.

The coil pattern portion 111 may be formed of a metal having excellent electrical conductivity and may be formed of a metal such as Ag, Pd, Al, Ni, Ti, Gold (Au), copper (Cu), platinum (Pt), an alloy thereof, or the like.

An insulating portion 112 is formed on the outer surface of the coil pattern portion 111.

The insulating portion 112 has a function of preventing a leakage current from the coil pattern portion 111, a function of preventing a short circuit between adjacent coil pattern portions, a function of stably fixing adjacent coil pattern portions, And may be a material that is disposed on the outer surface of the coil pattern unit 111 to realize a predetermined function. For example, the insulating part 112 may be a polymer insulating film formed by coating a polymer material on the surface of the coil pattern part 111, and may be an oxide film of at least one metal contained in the coil pattern part 111 But the present invention is not limited thereto.

The magnetic region 12 in the body 1 may be a region that surrounds the surface of the nonmagnetic region and buries the nonmagnetic region so that the outer shape of the coil component can be determined.

The magnetic region 12 may be formed of a magnetic powder-resin composite in which a magnetic powder and a resin mixture are mixed. The material filled in the magnetic region 12 is not limited as long as it is a material exhibiting magnetic properties. For example, the magnetic powder may be formed by filling a ferrite or a metal soft magnetic material, and the ferrite may be Mn-Zn ferrite, Ni-Zn ferrite, Ni-Zn-Cu ferrite, Mn-Mg ferrite Ferrite, Ba ferrite, Li ferrite, or the like. The metal-based soft magnetic material may be an alloy including at least one selected from the group consisting of Fe, Si, Cr, Al, and Ni. But is not limited thereto.

The metal-based soft magnetic material may have a particle diameter of 0.1 to 30 μm and may be dispersed on a polymer such as an epoxy resin or polyimide, but the present invention is not limited thereto .

FIG. 3 is a schematic cross-sectional view showing the area A of FIG. 2 in a larger scale.

Referring to FIG. 3, the coil pattern portion 111 included in the non-magnetic region 11 includes a plurality of coil patterns 111a. The number N of the coil patterns 111a coincides with the number of turns of the coil, which can be appropriately selected in consideration of the inductance and efficiency required for the coil component, and is not limited to a specific number.

Referring to FIG. 3, the length from the end of the innermost coil pattern to the end of the outermost coil pattern is referred to as 'length A', with reference to the direction of the length L of the body.

The sum of the widths of the coil patterns of the length A is referred to as a length B, with reference to the direction of the length L of the body. In this case, the width of the coil pattern means a length based on the direction of the length L of the body, and is generally the same as the width of the inner coil pattern of the coil part.

The length of the plurality of insulation portions is referred to as a length C, with the length B excluding the length B which is the sum of the widths of the coil patterns of the length A based on the direction of the length L of the body.

In other words, the length A means the sum of the length B and the length C. [

Here, the length A, the length B, and the length C mean the length of the body corresponding to the longest length in the longitudinal direction of the body. For example, when the sum of the widths of the coil patterns 111a on the lower surface of the coil pattern portion 111 is larger than the sum of the widths of the coil patterns 111a on the upper surface of the coil pattern portion 111, And the length B means the total sum of the widths of the coil patterns in the longitudinal direction of the body at the lower surface of the coil pattern portion 111. [

(C / B) of the length C to the length B and an average width (W) of the coil pattern are defined as a length D. [

On the other hand, throughout this specification, unit of length is assumed to be micrometer [mu m] unless otherwise specified.

According to an embodiment of the present invention, the length (length A) from the end of the innermost coil pattern to the end of the outermost coil pattern with respect to the entire length (length B) of the coil pattern portion with respect to the longitudinal direction of the body, By controlling the ratio (C / B) of the total length (length C) of the insulation portion excluding the entire length of the coil portion (length B), the inductance and the DC resistance value of the coil component can be simultaneously improved. Specifically, when the value of the ratio (C / B) is less than 30%, the improvement of the inductance and the reduction of the DC resistance value can be simultaneously obtained. In this case, when the value of the ratio (C / B) is 7.5% or less, the insulation part can not be secured sufficiently, and the reliability of the coil part may be deteriorated. Therefore, the value of the ratio (C / B) is preferably more than 7.5% and less than 30%.

According to one example of the present invention, when the length D is 5.5 탆 or less, a high inductance value and a low DC resistance value are secured at the same time. This is because, when the length D is larger than 5.5 占 퐉, the insulation portion is excessively arranged as compared with the coil pattern portion even if an average width of a certain degree of coil pattern is ensured, and a sufficient inductance value can not be ensured.

According to one example of the present invention, by controlling the ratio of the square of the number N of coil patterns to the length D (2 x N ^0.4 ), i.e., {D / (2 x N ^0.4 ) The inductance value and the DC resistance value can be controlled. Specifically, when the ratio D / (2 x N ^0.4 ) has a value smaller than 1, and the length D is smaller than twice the square of 0.4 of the number (N) of coil patterns, a high inductance value and a low DC resistance value Can be ensured.

Table 1 below shows the relationship between the number of coil patterns N and the width W of each coil pattern while keeping the constant value of the inductance increase rate, the DC resistance Rdc reduction rate, The composite rate of the inductance rise rate and the DC resistance decrease rate, and the resulting defect rate.

The following graph 1 shows the inductance Ls rise rate, the DC resistance Rdc decrease rate, the inductance rise rate and the combined rate of the DC resistance decrease rate (Ls rise rate-Rdc decrease rate) in the first to tenth embodiments of Table 1, .

In this case, the number N of coil patterns is 20, the width W of each coil pattern is 24 mu m, and the thickness of the insulating layer covering the upper surface of the coil pattern is 10 mu m And the coil part is used as a reference, which is the reference coil part according to the embodiment 9 of the following [Table 1].

On the other hand, when the insulating layer coated on the outer surface of the coil pattern is uniform, a value corresponding to twice the thickness of the insulating layer can be a distance between adjacent coil patterns, but the present invention is not necessarily limited thereto .

In the present invention, the length B is defined as the length occupied by the entire insulation between adjacent coil patterns within a length from the end of the innermost coil pattern to the end of the outermost coil pattern with respect to the longitudinal direction of the body. In this case, the width of the coil pattern may be constant with respect to the longitudinal direction of the body, and the widths of the adjacent coil patterns may be different from each other, and the present invention is not limited to any of the above cases.

[Graph 1]

Referring to [Table 1] and [Graph 1] above, when the thickness of the insulating layer covering the upper surface of one coil pattern is set to 1 탆 or less with respect to the thickness direction of the body, the defective BDV (BREAK DOWN VOLTAGE) The reliability is lowered due to excessive use, and it is difficult to use. In addition, when the thickness of the insulating layer is 12 占 퐉 or more, the inductance value is lowered and the Rdc value is also increased, thereby causing a problem of increasing power loss, and at the same time, there is a risk of disconnection failure.

Therefore, it is preferable that the thickness of the insulating layer covering the upper surface of the coil pattern is 1 占 퐉 or more and 12 占 퐉 or less based on the thickness direction of the body.

Referring to [Table 1] and [Graph 1] above, with respect to the longitudinal direction of the body, the length from the end of the innermost coil pattern to the end of the outermost coil pattern with respect to the entire length (length B) (C / B) of the total length (length C) of the insulation portion excluding the entire length (length B) of the coil pattern portion in the length (length A) is controlled to be more than 7.5% and less than 30%, the inductance value and the direct current The resistance value can be remarkably improved by 20% or more as a whole. Particularly, in this case, the inductance is remarkably improved to 10% or more as compared with the comparative coil part (Example 9), and the direct current resistance is remarkably improved to 10% or more as compared with the coil component to be referred to (Example 9).

Referring to Table 1 and FIG. 1, the ratio of the square of the number N of coil patterns to the value of the coil D of 2 times (2 x N ^0.4 ), that is, {D / (2 x N ^0.4 )}, The inductance value and the DC resistance value can be remarkably improved by 20% or more as a whole. This results in significantly improving the inductance characteristic and the direct current resistance characteristic by controlling the number N of coil patterns, the total length of the coil pattern portion within the entire length of the non-magnetic region, and the entire length of the insulation portion between adjacent coils .

Next, the following Table 2 shows the inductance increasing rate, the DC resistance Rdc reduction ratio (the ratio of the inductance of the coil) to the number of the coil patterns and the thickness of the insulating portion when the number N of the coil patterns and the thickness of the insulating portion are changed while keeping the average width W of the multiple coil patterns constant. , And the composite ratio of the inductance rise rate and the DC resistance decrease rate. In this case, in the case of the first to fourth embodiments, the number N of coil patterns is 12, the number of coil patterns N is 16 in the fifth to eighth embodiments, Examples 9 to 12 show the case where the number N of coil patterns is 20, and the examples 13 to 16 show the case where the number N of coil patterns is 24.

In this case, as in Table 1, the number N of coil patterns is 20, the width W of each coil pattern is 24 μm, And the length of one insulating layer covering the periphery of the coil part is 10 mu m, and the coil part of the embodiment 16 of the following [Table 2] is a reference.

The following graph 2 shows the relationship between the inductance Ls rise rate, the DC resistance Rdc decrease rate, the inductance rise rate and the DC resistance decrease rate (Ls rise rate-Rdc decrease rate) of Examples 1 to 16 of Table 2, .

[Graph 2]

Referring to [Table 2] and [Graph 2], it is preferable that the length D is less than 5.5 탆. In this case, a high inductance value and a low DC resistance value are secured at the same time. If the length D is larger than 5.5 占 퐉, even if the average width of the coil pattern is secured to a certain extent, the insulation portion is excessively disposed as compared with the coil pattern portion, and a sufficient inductance value can not be ensured.

Referring to [Table 2] and [Graph 2], the ratio of the value (2 × N ^0.4 ) of twice the square of the number N of coil patterns to the length D (ie, D / (2 × N ^0.4 ) 1, it is possible to remarkably improve the inductance value and the DC resistance value by 20% or more as a whole. This is because the relationship between the number N of coil patterns, the length of the coil pattern portion within the entire length of the nonmagnetic region, and the entire length of the insulation portion between the adjacent coil patterns is all controlled to derive significantly improved inductance characteristics and DC resistance characteristics .

According to the present invention, it is possible to provide a coil component capable of reducing power loss by having a low resistance characteristic while improving inductance characteristics, a coil component capable of improving the efficiency of the electronic component, May be provided.

The present invention is not limited by 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.

In the meantime, the expression "an example" used in this disclosure does not mean the same embodiment but is provided for emphasizing and explaining different unique features. However, the above-mentioned examples do not exclude that they are implemented in combination with the features of other examples. For example, although a matter described in a particular example is not described in another example, it may be understood as an explanation related to another example, unless otherwise stated or contradicted by that example in another example.

On the other hand, the terms used in this disclosure are used only to illustrate an example and are not intended to limit the present disclosure. Wherein the singular expressions include plural expressions unless the context clearly dictates otherwise.

100: Coil parts
1: Body
11: magnetic region
12: Non-magnetic region
111: coil pattern portion
112:
111a: coil pattern

Claims (16)

A body including two opposite surfaces facing each other in the thickness direction, two surfaces facing each other in the longitudinal direction, and both surfaces facing each other in the width direction; And
And an external electrode disposed on an outer surface of the body,
Wherein the body comprises a magnetic region and a non-magnetic region,
Wherein the nonmagnetic region includes a coil pattern portion including a plurality of coil patterns and an insulating portion disposed to surround the coil pattern portion,
A length A from the innermost coil pattern to the outermost coil pattern in the nonmagnetic region is defined as a length A, an entire length of the coil pattern portion in the length A is defined as a length B, (C / B) of the length C to the length B and the average width (W) of the coil pattern in the coil pattern portion is the length D,
(C / B) of the length C to the length B satisfies C / B < 30%
Coil parts.
The method according to claim 1,
(C / B) of the length C to the length B satisfy 7.5% < C / B,
Coil parts.
The method according to claim 1,
The length D satisfies D &amp;le; 5.5 mu m,
Coil parts.
The method according to claim 1,
The thickness of the insulating layer disposed on the upper surface of the coil pattern portion with respect to the thickness direction of the body is greater than 1 mu m,
Coil parts.
The method according to claim 1,
The thickness of the insulating layer disposed on the upper surface of the coil pattern portion with respect to the thickness direction of the body is less than 12 占 퐉,
Coil parts.
The method according to claim 1,
The length D is smaller than a value {(2 x N ^0.4 )} that is twice the square of 0.4 of the number of revolutions (N) of the coil pattern in the coil pattern portion.
Coil parts.
The method according to claim 1,
The width (W) of the coil pattern adjacent to each other with respect to the longitudinal direction of the body is the same,
Coil parts.
The method according to claim 1,
The distance between the adjacent coil patterns with respect to the longitudinal direction of the body is equal to twice the thickness of the insulating layer disposed on the upper surface of the coil pattern portion with respect to the thickness direction of the body,
Coil parts.
A body including two opposite surfaces facing each other in the thickness direction, two surfaces facing each other in the longitudinal direction, and both surfaces facing each other in the width direction; And
And an external electrode disposed on an outer surface of the body,
Wherein the body comprises a magnetic region and a non-magnetic region,
Wherein the nonmagnetic region includes a coil pattern portion including a plurality of coil patterns and an insulating portion disposed to surround the coil pattern portion,
A length A from the innermost coil pattern to the outermost coil pattern in the nonmagnetic region is defined as a length A, an entire length of the coil pattern portion in the length A is defined as a length B, (C / B) of the length C to the length B and the average width (W) of the coil pattern in the coil pattern portion is the length D,
The length D is smaller than a value {(2 x N ^0.4 )} that is twice the square of 0.4 of the number of revolutions (N) of the coil pattern in the coil pattern portion.
Coil parts.
10. The method of claim 9,
(C / B) of the length C to the length B satisfies 7.5% < C / B < 30%
Coil parts.
10. The method of claim 9,
The length D satisfies D &amp;le; 5.5 mu m,
Coil parts.
10. The method of claim 9,
The thickness of the insulating layer disposed on the upper surface of the coil pattern portion with respect to the thickness direction of the body is greater than 1 mu m,
Coil parts.
10. The method of claim 9,
The thickness of the insulating layer disposed on the upper surface of the coil pattern portion with respect to the thickness direction of the body is less than 12 占 퐉,
Coil parts.
10. The method of claim 9,
The width (W) of the coil pattern adjacent to each other with respect to the longitudinal direction of the body is the same,
Coil parts.
10. The method of claim 9,
The distance between the adjacent coil patterns with respect to the longitudinal direction of the body is equal to twice the thickness of the insulating layer disposed on the upper surface of the coil pattern portion with respect to the thickness direction of the body,
Coil parts.
10. The method of claim 9,
The widths of the coil patterns adjacent to each other with respect to the longitudinal direction of the body are different from each other,
Coil parts.

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