KR20180006247A - Coil component - Google Patents

Abstract

The present invention relates to a coil part, which can be miniaturized and has Q characteristics. The coil part according to an embodiment of the invention comprises: a body; a coil disposed inside the body and forming a coil trajectory when penetrating in a stacking direction; and an external electrode disposed outside the body, wherein the coil trajectory includes an edge part and a linear part connecting the edge part, and the line width of the edge part is larger than the line width of the linear part.

Description

Coil Components {COIL COMPONENT}

The present invention relates to a coil component capable of miniaturization and having a high Q characteristic.

The inductor, which is one of the coil parts, is a passive element which is a typical passive element that removes noise by forming an electronic circuit together with a resistor and a capacitor. It is a coil part that combines with a capacitor using electromagnetic characteristics, A resonant circuit for amplification, and a filter circuit.

In recent years, miniaturization and thinning of IT devices such as various communication devices and display devices have been accelerated. Researches for miniaturization and thinning of various devices such as inductors, capacitors, and transistors employed in IT devices have been continuously carried out .

In recent years, in the case of smartphones, signals of many frequency bands are used due to the application of LTE multi-band. As a result, it is mainly used as an impedance matching circuit in an RF system for transmitting and receiving a high frequency signal.

Passive elements such as high-frequency inductors are increasingly required to reduce the mounting area due to the reduction of the overall size and insufficient space for mounting due to the addition of additional functions, thereby increasing the demand for miniaturization and thinning of the passive elements.

Therefore, a coil part can be downsized and a product with a high Q characteristic is required.

Japanese Patent Application Laid-Open No. 2004-200406

One of the objects of the present invention is to provide a coil component which can be downsized and has a high Q characteristic at the same time.

As a method for solving the above-mentioned problems, the present invention proposes a novel structure of a coil part by way of example, and specifically, a body; A coil disposed inside the body and forming a coil trajectory when viewed in a stacking direction; And an outer electrode disposed on the outer side of the body, wherein the coil trajectory includes a linear portion connecting the corner portion and each corner portion, and the line width of the corner portion is larger than the line width of the linear portion.

As another method for solving the above-mentioned problems, the present invention proposes a novel structure of a coil part through another example. A coil disposed inside the body and forming a coil trajectory when viewed in a stacking direction; And an external electrode disposed outside the body, wherein the coil trajectory includes a linear portion connecting the corner portion and each corner portion, and assuming a circle tangent to the inside of the corner portion, the radius of the circle is 0.008 mm to 0.016 mm.

The coil part according to an embodiment of the present invention can increase the Q factor by preventing the problem that the current is stagnated at the corner part because the line width of the corner part of the coil is larger than the line width of the linear part.

1 schematically shows a cross-sectional view of a coil part according to an embodiment of the invention.
2 is an enlarged view of a portion A in Fig.
FIG. 3 is a graph schematically illustrating a comparison of Q factors of a coil component and a conventional coil component according to an embodiment of the present invention.

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. Further, the embodiments of the present invention are provided for a more complete description of the present invention to the ordinary artisan. 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. Further, throughout the specification, when an element is referred to as "including" an element, it means that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Figure 1 schematically illustrates a cross-sectional view of a coil component according to one embodiment of the invention, and Figure 2 is an enlarged view of portion A of Figure 1.

Referring to FIGS. 1 and 2, a coil component according to an embodiment of the present invention includes a body 10 and an external electrode 30.

The body 10 may be formed using a magnetic material, for example, a magnetic ceramic material.

The body 10 may be formed by laminating a magnetic ceramic sheet. The magnetic ceramic sheet is a sheet in which a ceramic slurry having a magnetic material such as a Cu-Zn ferrite powder or a Ni-Cu-Zn-Mg ferrite powder as a main material is molded to a predetermined thickness and on which a coil can be printed have. That is, the body 10 may be formed by alternating lamination of a ceramic sheet and a coil pattern.

The external electrode 30 may be disposed outside the body 10 and may be electromagnetically connected to the lead-out portion 22 of the coil 20.

The external electrodes 30 may be disposed on the lower surface of the body 10. In this case,

The external electrode 30 may extend from the lower surface of the body 10 to the side of the body 10 and surround the lower edge of the body 10.

The first electrode layer 30a formed by using the conductive paste may be formed on the external electrode 30 and the second electrode layer 30b and the third electrode layer 30c may be formed on the first electrode layer 30a have.

The second electrode layer 30b and the third electrode layer 30c are formed by sequentially plating Cu on the surface of the substrate with copper, Ni, tin or Ni and tin Lt; / RTI >

A coil (20) is disposed inside the body (10).

The coil 20 may be arranged to form a coil trajectory when a plurality of coil patterns are viewed in the stacking direction. Each of the coil patterns is electrically connected to each other through the connecting portion 21 to constitute a coil 20 which is wound in a clockwise or anticlockwise pattern.

That is, the coil patterns of the respective layers are connected to each other through the connection portion 21 formed at a predetermined position of the magnetic ceramic sheet to form one coil which spirally turns. That is, the coil pattern of each layer can be printed on each ceramic sheet in the form of a single coil being split plated.

At both ends of the coil 20, lead portions 22 are arranged. The lead portion 22 is electrically connected to the external electrode 30 disposed on the outside of the body 10.

The coil pattern may be formed by applying a metal paste, for example, at least one kind of metal selected from Ni, Al, Fe, Cu, Ti, Cr, Au, Ag, Pd and Pt, As shown in FIG.

As shown in FIG. 1, the coil part according to an embodiment of the present invention may be arranged such that when the surface on which all the external electrodes 30 are formed is a mounting surface, the coil 20 may be disposed perpendicular to the mounting surface .

As described above, when projected in a direction perpendicular to the winding direction of the coil 20, one orbit is formed, and the lead portion 22 is disposed outside the orbit.

The lead portion 22 may be disposed in a layer where the end portion of the coil 20 is not disposed in order to improve contact between the external electrode 30 and the body.

In order to improve the inductance of the coil component, it is necessary to increase the internal area of the trajectory of the coil 20. [

In general, the coil trajectory of the coil 20 is formed in a quadrangular shape in order to maximize the internal area of the orbit of the coil 20 because the body of the laminated or thin film coil component is hexahedral.

That is, the coil trajectory includes the rolls of the linear portion 20a and the edge portion 20b.

The coil trajectories are formed such that each linear portion 20b is connected by the corner portion 20b to form one coil trajectory.

When the lead portion 22 is disposed outside the orbit, the trajectory of the coil 20 is formed so that the trailing portion 22 and the portion of the coil 20, which form the trajectory of the coil 20, It is formed only linearly in the vicinity.

However, as can be seen from the coil pattern disposed at the lower end of the coil trajectory in FIG. 1, the coil part according to an embodiment of the present invention includes the lead portion 22 disposed at both ends in one direction inside the body 10 The inductance of the coil component can be improved by extending the trajectory of the coil 20 to the region between the coil component and the coil component.

That is, in order to extend the trajectory of the coil 20 to the region between the lead portions 22 disposed at both ends in one direction of the inside of the body 10, the trajectory of the coil 20 has an inwardly protruding corner portion I have.

At this time, the corner portion protruding outward from the coil track is referred to as a first corner portion 25a, and the corner portion protruding inward from the coil track is referred to as a second corner portion 25b.

When the external electrode 30 is formed in the shape of "┗" or "┛" so as to surround the edge of the mounting surface of the body 10, the lead portion 22 is formed in the shape of "┗" or "┛" do.

That is, when the lead portion 22 has a shape such as "┗" or "┛", the trajectory 20 of the coil has a second edge portion that protrudes inward to correspond to a shape such as "┗" (25b) to extend the trajectory of the coil (20) to a point between the straight line of the bottom such as "┗" or "┛.

Accordingly, the second corner portion 25b can be disposed at a position corresponding to the end portion of the lead portion 22. [ For example, the second corner portion 25b may be disposed at a position corresponding to the end of the horizontal portion of "┗" or " ┛ " when the lead portion 22 has a shape such as " .

In addition, when having a shape such as "┗" or "┛, " the orbit 20 of the coil projects outwardly of the A region so as to have a certain distance from the vertical portion of the shape such as" The corner portion, for example, the first corner portion 25a, may be formed such that the inside is acute. By forming the first corner portion 25a at an acute angle, the distance between the lead portion 22 or the external electrode 30 and the coil can be increased, and the parasitic capacitance can be lowered.

Generally, the trajectory of the coil 20 is bent at the corner portion, and the current density is increased at the corner portion of the trajectory of the coil 20 of this type.

Therefore, the resistance R of the coil component increases due to the skin effect occurring at the portion where the current density increases, and the current distribution on the surface becomes uneven, resulting in loss of Q factor.

Particularly, the first edge 25a protruding outward of the A region so that the orbit 20 of the coil has a certain distance from the vertical portion of the shape of " ┗ "or " The increase in the current density is further intensified. As a result, the skin effect increases the resistance (R) of the coil component, and the current distribution on the surface becomes uneven, resulting in loss of Q factor . ≪ / RTI >

However, the coil component according to an embodiment of the present invention includes the coil 20 having the corner portion 20b where the coil pattern is bent and the linear portion 20a connecting each corner portion 20b, and the corner portion 20b Is made larger than the line width t1 of the linear portion 20a so that the current density is evenly distributed in the corner portion 20b and the resistance of the coil due to the skin effect is reduced. Thus, the Q factor of the coil component can be improved.

For example, when t ₁ is 14 탆, the coil 20 can be formed so that t ₂ is 18 탆, so that the Q factor of the coil component can be improved.

That is, in order to improve the Q factor of the coil component, the line width t2 of the corner portion 20b may be increased by 30 to 40% with respect to the line width t1 of the linear portion 20a.

Further, in order to obtain the same effect as described above, the coil pattern can be formed such that the surface area of the corner portion 20b is larger than the surface area of the linear portion 20a.

Assuming a circle tangent to one side of the corner portion 20b when the coil 20 includes the corner portion 20b where the coil pattern is bent and the linear portion 20a connecting each corner portion 20b, The radius (r ₁ ) of the circle can be formed to be 0.008 mm to 0.016 mm.

In the case of the first edge portion (25a) case, assuming a circle in contact with the inner side of the coil track, and a second edge portion (25b) has assumed a circle tangent to the outer side of the coil track, the radius of the circle (r ₁₎ May be formed to be 0.008 mm to 0.016 mm.

Table 1 below shows characteristics of L, Q, and Rs for each frequency of a coil component by analyzing characteristics by changing the configuration of the corners of the same capacity model (line width of 12 mu m in line width). 3 is a graph schematically illustrating a comparison of Q factors of a coil component and a conventional coil component according to an embodiment of the present invention.

3, the radius of the circle is 0.016 mm (t ₂ : 0.0156 mm), assuming a circle tangent to the inside of the corner portion 20b. And the Q value when the radius of the circle is 0.01 mm (t ₂ : 0.0115 mm). That is, it is a graph when the line width of the embodiment is increased by 35% as compared with the comparative example.

Sample
r ₁ (mm)
t ₂ (mm) L [nH] Q Rs [Ω] 0.5
GHz 2.4
GHz 0.5
GHz 2.4
GHz 0.5
GHz 2.4
GHz 1.0
MHz One 0.006 0.0086 1.0414 1.0360 21.9857 50.7810 0.1488 0.3076 0.0607 2 0.008 0.0088 1.0412 1.0358 21.8873 50.9024 1.1494 0.3069 0.0609 3 0.010 0.0115 1.0381 1.0322 21.6554 51.0818 0.1506 0.3047 0.0598 4 0.012 0.0118 1.0380 1.0330 22.1177 51.7718 0.1474 0.3009 0.0594 5 0.014 0.0126 1.0380 1.0338 22.4118 53.3030 0.1455 0.2980 0.0590 6 0.016 0.0156 1.0364 1.0324 22.6291 53.2023 0.1439 0.2926 0.0577 7 0.018 0.0150 1.0357 1.0307 22.1129 52.0951 0.1471 0.2983 0.0581

The following Table 2 shows the rate of change of L value measured at 0.5 GHz, the rate of change of Q value measured at 2.4 GHz, the rate of change of Rs measured at 2.4 GHz, and the rate of change of Rdc. However, the change rate of Rdc is based on the Rs value measured at 1.0 MHz.

Sample
r ₁ (mm)
t ₂ (mm) ΔL ΔQ ΔRs ΔRdc Rate of change
(%) Rate of change
(%) Rate of change
(%) Rate of change
(%) One 0.006 0.0086 0.00 0.00 0.00 0.00 2 0.008 0.0088 -0.02 0.24 -0.23 0.33 3 0.010 0.0115 -0.32 0.59 -0.94 -1.48 4 0.012 0.0118 -0.33 1.95 -2.18 -2.14 5 0.014 0.0126 -0.33 3.00 -3.12 -2.80 6 0.016 0.0156 -0.48 4.77 -4.88 -4.94 7 0.018 0.0150 -0.55 2.59 -3.02 -4.28

Referring to Tables 1 and 2, the inductance (L) value is reduced to about 0.5% due to the decrease in the linkage area due to the change in the linewidth of the corner portion, but the Q The value is increased by up to 4.77%. However, rather than increasing the line width to more than 40% (Example 7), it can be seen that the Q characteristic decreases.

Therefore, in order to improve the Q factor, the line width t ₂ of the corner portion 20b may be increased by 30 to 40% compared to the line width t ₁ of the linear portion 20a.

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.

10: Body
20: Coil
20a:
20b:
21: Connection
22:
30: external electrode
30a: first electrode layer
30b: second electrode layer
30c: third electrode layer

Claims (15)

body;
A coil disposed inside the body and forming a coil trajectory when viewed in a stacking direction; And
And an external electrode disposed outside the body,
Wherein the coil trajectory includes a linear portion connecting an edge portion and each corner portion,
And the line width of the corner portion is larger than the line width of the linear portion.
The method according to claim 1,
And the line width of the corner portion is 30 to 40% larger than the line width of the linear portion.
The method according to claim 1,
Wherein the corner portion includes a first corner portion protruding outwardly in the coil track and a second corner portion protruding inward in the coil track.
The method according to claim 1,
Further comprising a lead portion disposed outside the coil trajectory and connecting the external electrode to an end portion of the coil.
5. The method of claim 4,
Wherein the corner portion includes a first corner portion protruding outward in the coil track and a second corner portion protruding inward in the coil track,
And the second corner portion is disposed at a position corresponding to an end of the lead portion.
The method according to claim 1,
Wherein the corner portion includes a first corner portion protruding outward in the coil track and a second corner portion protruding inward in the coil track,
And the first corner portion has an acute angle inward in the coil track.
The method according to claim 1,
Wherein the coil is disposed perpendicular to a mounting view of the body.
The method according to claim 1,
Wherein the external electrode is disposed in a mounting surface of the body.
body;
A coil disposed inside the body and forming a coil trajectory when viewed in a stacking direction; And
And an external electrode disposed outside the body,
Wherein the coil trajectory includes a linear portion connecting an edge portion and each corner portion,
Assuming a circle tangent to one side of the corner, the radius of the circle is 0.008 mm to 0.016 mm.
8. The method of claim 7,
Wherein the corner portion includes a first corner portion protruding outwardly in the coil track and a second corner portion protruding inward in the coil track.
8. The method of claim 7,
Further comprising a lead portion disposed outside the coil trajectory and connecting the external electrode to an end portion of the coil.
12. The method of claim 11,
Wherein the corner portion includes a first corner portion protruding outward in the coil track and a second corner portion protruding inward in the coil track,
And the second corner portion is disposed at a position corresponding to an end of the lead portion.
8. The method of claim 7,
Wherein the corner portion includes a first corner portion protruding outward in the coil track and a second corner portion protruding inward in the coil track,
And the first corner portion has an acute angle inward in the coil track.
8. The method of claim 7,
Wherein the coil is disposed perpendicular to a mounting view of the body.
8. The method of claim 7,
Wherein the external electrode is disposed in a mounting surface of the body.

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