KR20130112241A

KR20130112241A - Multilayer type inductor

Info

Publication number: KR20130112241A
Application number: KR1020120034474A
Authority: KR
Inventors: 임봉섭
Original assignee: 삼성전기주식회사
Priority date: 2012-04-03
Filing date: 2012-04-03
Publication date: 2013-10-14

Abstract

In one embodiment, a stacked inductor includes a main body in which a plurality of sheets in which internal electrodes are formed are stacked; An external electrode formed on an outer surface of the main body; And a connection reinforcing pattern formed on at least one of the plurality of sheets so as to be implemented at a plurality of points at which electrical connections between the inner electrode and the outer electrode are spaced apart from each other.

Description

Multilayer Inductor {Multilayer type inductor}

The present invention relates to a multilayer inductor.

An inductor, which is one of the multilayer chip electronic components, is a representative passive element used as a component that forms an electronic circuit together with a resistor and a capacitor to remove noise, or forms an LC resonant circuit.

These inductors are manufactured by winding coils around a ferrite core or printing and forming electrodes on both ends of the inductor, and then stacking a plurality of magnetic bodies or dielectrics after printing internal electrodes on magnetic or dielectric materials. And the like.

On the other hand, recently, the multilayer inductor has been widely used, and the multilayer inductor has a structure in which a plurality of magnetic layers or dielectric layers in which internal electrodes are formed, as described above, and internal electrodes are via electrodes formed in respective layers. By sequentially connecting by forming a coil structure as a whole, it is possible to implement characteristics such as target inductance and impedance.

Here, in order to realize the characteristics of the inductance and impedance, which are intended for the multilayer inductor, the internal electrode and the external electrode must be electrically connected, and the stability of the connection is an important factor that determines the performance of the multilayer inductor.

However, in the related art, miniaturization and thinning of the multilayer inductor have been made, and even when the multilayer inductor is manufactured as designed, a problem occurs in that the connection between the internal electrode and the external electrode is weak, resulting in delamination or poor connection. Occurred.

Patent Document 1 described in the following prior art document still has a problem that the performance may be degraded by poor electrical connection between the internal electrode and the external electrode.

Korean Laid-Open Patent Publication No. 2012-0004868

An object of the present invention is to reinforce the electrical connection between the internal electrode and the external electrode to improve the electrical properties and at the same time to ensure the stability of the external mechanical impact to the multilayer inductor.

The connection reinforcing pattern of the multilayer inductor according to an exemplary embodiment may be in contact with the external electrode.

Internal electrodes formed on the plurality of sheets of the multilayer inductor according to an exemplary embodiment of the present invention are connected to each other to form one coil, and the connection reinforcement pattern is configured to connect the external electrodes from the internal electrodes forming one end of the coil. It can be formed extending toward.

An internal electrode forming one end of the coil of the multilayer inductor according to an embodiment of the present invention includes a connection electrode extending along one side edge of the main body, and the connection reinforcement pattern is formed from the connection electrode. A plurality may be formed to extend toward.

The connection reinforcing pattern of the stacked inductor according to an exemplary embodiment of the present invention may be formed on at least some of the sheets sequentially stacked among the plurality of sheets.

The connection reinforcing pattern of the stacked inductor according to the exemplary embodiment of the present invention may be connected by a via electrode along the stacking direction.

The sheet of the multilayer inductor according to an exemplary embodiment of the present invention may include a first sheet disposed on an uppermost side, a second sheet disposed on a lowermost side, and between the first sheet and the second sheet. At least one inner sheet is disposed, and the connection reinforcing pattern may be formed on the inner electrodes formed on the first sheet and the second sheet.

The internal electrodes formed on the first sheet and the second sheet of the multilayer inductor according to an embodiment of the present invention include a connection electrode extending along one edge of the main body, and the connection reinforcing pattern is the connection electrode. A plurality of extending from the toward the external electrode may be formed from.

The connection reinforcing pattern of the multilayer inductor according to an exemplary embodiment of the present invention may be formed in at least some of the inner sheets sequentially stacked from one surface of the first sheet and the second sheet, respectively.

According to the multilayer inductor according to the present invention, the electrical connection between the internal electrode and the external electrode can be strengthened.

In addition, stability can be ensured even against mechanical shocks and external shocks generated when the substrate or the like is mounted.

1 is a schematic perspective view showing a stacked inductor according to an embodiment of the present invention.
2 is a schematic exploded perspective view showing a multilayer inductor according to an embodiment of the present invention.
3 is a schematic exploded perspective view showing a multilayer inductor according to another embodiment of the present invention.
4 is a schematic cross-sectional view showing a multilayer inductor according to another embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

1 is a schematic perspective view of a multilayer inductor according to an embodiment of the present invention, and FIG. 2 is a schematic exploded perspective view of a multilayer inductor according to an embodiment of the present invention.

1 and 2, the multilayer inductor 100 according to an exemplary embodiment of the present invention includes a main body 110, an external electrode 120, and a connection reinforcement pattern 140 in which a plurality of sheets 112 to 119 are stacked. ) May be included.

Here, all of the internal electrodes 130 formed on the plurality of sheets 112 to 119 will be described using the same reference numerals.

The main body 110 is a laminate in which a plurality of sheets 112 to 119, which are ceramic layers, magnetic layers, nonmagnetic layers, or dielectric layers, are stacked. The main body 110 may have a rectangular parallelepiped or a similar shape, and may include an internal electrode 130 therein. Can be.

Ferrite may be used when the sheets 112 to 119 are formed of a magnetic material, and the ferrite may be appropriately selected according to a magnetic property required as an electronic component, but it may be advantageous that the resistivity is large and relatively low loss. Can be.

Specifically, the sheets 112 to 119 may be Ni-Zu-Cu based ferrite, and a dielectric having a dielectric constant of about 5 to about 100 may be used.

In addition, when the sheets 112 to 119 are made of a nonmagnetic dielectric, the sheets 112 to 119 may be made of a ceramic material made of zirconium silicate, potassium zirconium, zirconium, or the like.

In the case where the multilayer inductor 100 is formed of a ceramic layer formed of a magnetic material or a nonmagnetic material, the difference in the coefficient of linear expansion may be reduced according to the material selection.

Meanwhile, the sheets 111 to 119 constituting the main body 110 may also include a sheet 111 on which the internal electrodes 130 are not formed, and the sheets 112 to 119 on which the internal electrodes 130 are formed. The first sheet 112 disposed on the uppermost side, the second sheet 119 disposed on the lowermost side, and the at least one inner sheet 113 disposed between the first sheet 112 and the second sheet 119. 118).

In this case, the inner sheets 113 to 118 are not necessarily determined, and may be variously changed in consideration of the size of inductance or impedance to be implemented.

In addition, a cover sheet 111 may be stacked on an upper side of the first sheet 112 and a lower side of the second sheet 119, and the cover sheet 111 may be stacked according to an embodiment of the present invention. It may function as a cover that protects the inside of the filter 100.

Here, the components of the cover sheet 111 is not particularly limited, and may be formed of the same material as the sheets 112 to 119 in which the internal electrodes 130 are formed.

The internal electrodes 130 may be formed on the plurality of sheets 112 to 119, and coils may be formed in the main body 110 formed by stacking the sheets 112 to 119.

That is, the internal electrodes 130 formed on the sheets 112 to 119 may be electrically connected to the via electrodes 150 to form one coil, thereby implementing inductance or impedance.

Here, the internal electrode 130 may be made of a conductive material, and may be made of one or more of Ag, Pt, Pd, Cu, Au, and Ni or an alloy thereof.

Specifically, the internal electrodes 130 formed on the first sheet 112 disposed on the uppermost side and the second sheet 119 disposed on the lowermost side of the sheets 112 to 119 on which the internal electrodes 130 are formed are the main body. The external electrode 120 formed on the outer surface of the 110 and the connection reinforcement pattern 140 may be electrically connected to each other, and for this purpose, the connection electrode 132 may be provided.

That is, the connection electrode 132 may be one component of the internal electrode 130 formed on the first sheet 112 and the second sheet 119, and may be formed to extend along one edge of the main body 110. Can be.

The external electrodes 120 may be formed on the outer surface of the main body 110, that is, on both sides, and may be a pair.

The external electrodes 120 may be electrically connected to the internal electrodes 130 formed on the first sheet 112 and the second sheet 119, respectively.

Here, the external electrode 120 may be formed by a method of immersing the body 110 in a conductive paste, a printing method, deposition or sputtering.

In this case, the conductive paste may include silver (Ag), silver-palladium (Ag-Pd), nickel (Ni), copper (Cu), or the like.

In addition, a nickel (Ni) plating layer and tin (Sn) plating layer may be further formed on the surface of the external electrode 120 if necessary.

The connection reinforcement pattern 140 is formed on at least one of the plurality of sheets 111 to 119 to make electrical connection between the internal electrode 130 and the external electrode 120. ) And may be implemented at a plurality of points at which the electrical connection is spaced apart.

In other words, the internal electrodes 130 formed on the plurality of sheets 112 ˜ 119 may form coils by the via electrodes 150, and the connection reinforcement pattern 140 may form one end of the coil. The internal electrode 130 may extend toward the external electrode 120.

That is, the internal electrode 130 forming one end of the coil may include a connection electrode 132 extending along one side edge of the main body 110, and the connection reinforcing pattern 140 may be connected to the internal electrode 130. It may be formed extending from the electrode 132 toward the external electrode 120.

Specifically, the connection electrode 132 is formed on the first sheet 112 disposed on the uppermost side of the sheets 112 to 119 on which the internal electrodes 130 are formed, and on the second sheet 119 disposed on the lowermost side. It may be one configuration of the internal electrode 130, the connection reinforcing pattern 140 may be formed extending from the connecting electrode 132 toward the external electrode 120 spaced apart.

Therefore, the internal electrode 130 and the external electrode 120 may be connected at a plurality of points spaced apart from each other by the connection reinforcing pattern 140, thereby enhancing the electrical connection to prevent delamination. At the same time, it can ensure stability against mechanical shock.

That is, in the case of a conventional inductor in which a connection terminal extends to an external electrode and an electrical connection is made between an internal electrode and an external electrode, a delamination may occur at a portion where the internal electrode is exposed to the outside of the main body. When mounting on the substrate may also cause a problem that the connection between the internal electrode and the external electrode is broken by the stress generated by the solder and mechanical impact caused by the outside.

In addition, since the connecting portion of the internal electrode and the external electrode should be formed on both sides of the main body and the lower side of the main body to realize a high capacity inductor, the connection between the internal electrode and the external electrode is inevitably weaker.

However, in the case of the stacked inductor 100 according to the exemplary embodiment of the present invention, the portion where the connection between the internal electrode 130 and the external electrode 120 is connected by the connection reinforcing pattern 140 has a smaller width X than before. By forming a plurality, it is possible to strengthen the electrical connection and at the same time ensure the stability against mechanical shock or external impact.

On the other hand, the connection reinforcement pattern 140 when the internal electrode 130 is formed on the first sheet 112 and the second sheet 119, the formation of the internal electrode 130, that is, the internal electrode 130 Can be formed at the same time, and the number is also varied, so that the connection between the internal electrode 130 and the external electrode 120, that is, the internal electrode 130 and the external electrode 120 in the width direction (X) The contact part of the can be changed in various ways.

3 is a schematic exploded perspective view illustrating a multilayer inductor according to another exemplary embodiment of the present invention, and FIG. 4 is a schematic cross-sectional view illustrating a multilayer inductor according to another exemplary embodiment of the present invention.

Referring to FIGS. 3 and 4, the multilayer inductor 200 according to another exemplary embodiment of the present inventive concept is described with reference to FIGS. 1 and 2 except for the connection reinforcement pattern 240. Since the structure and effects are the same as those of the stacked inductor 100, descriptions other than the connection reinforcement pattern 240 will be omitted.

The connection reinforcement pattern 240 may be formed on at least some sheets 112 to 114 and 117 to 119 sequentially stacked among the plurality of sheets 111 to 119, and each sheet 112 to 114 and 117 to 119. The connection reinforcement pattern 240 formed at the bottom surface of the bottom surface may be electrically connected to each other by the via electrode 250 along the stacking direction (Y).

Specifically, the connection reinforcement pattern 240 may be formed on at least some inner sheets 112 to 114 and 117 to 119 that are sequentially stacked from one surface of the first sheet 112 and the second sheet 119, respectively. have.

More specifically, the inner sheets 117 and 118 which may be continuously formed on a part of the inner sheets 113 and 114 stacked downward from the first sheet 112 and are stacked upward from the second sheet 119. It can be formed continuously in part of.

However, the number of inner sheets 113, 114, 117, and 118 on which the connection reinforcement pattern 240 is formed is not fixed, and the contact area with the external electrode 120 in the thickness direction (Y direction) is determined. It can be changed in various ways.

Therefore, the multilayer inductor 200 according to another exemplary embodiment of the present invention has an internal electrode 130 in consideration of a delamination phenomenon, electrical connection between the internal electrode 130 and the external electrode 120, and mechanical strength improvement. ) And the contact area between the external electrode 120 may be variously changed.

While 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 exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that such modifications or variations are within the scope of the appended claims.

100, 200: multilayer inductor 110: main body
111-119: Sheet 112: 1st sheet
113 to 118: inner sheet 119: second sheet
120: external electrode 130: internal electrode
140 and 240: connection reinforcement pattern 150 and 250: via electrode

Claims

A main body in which a plurality of sheets in which internal electrodes are formed are stacked;
An external electrode formed on an outer surface of the main body; And
And a connection reinforcing pattern formed on at least one of the plurality of sheets so that electrical connections between the internal electrodes and the external electrodes are spaced apart from each other.

The method of claim 1,
The connection reinforcement pattern is a stacked inductor in contact with the external electrode.

The method of claim 1,
Internal electrodes formed on the plurality of sheets are connected to each other to form a coil,
The connection reinforcement pattern is a multilayer inductor is formed extending from the internal electrode forming one end of the coil toward the external electrode.

The method of claim 3,
The internal electrode forming one end of the coil has a connection electrode extending along one side edge of the body,
The connection reinforcement pattern is a multilayer inductor is formed by extending a plurality from the connection electrode toward the external electrode.

5. The method according to any one of claims 1 to 4,
The connection reinforcement pattern is a stacked inductor is formed on at least a portion of the plurality of sheets that are sequentially stacked.

The method of claim 5,
The connection reinforcement pattern is a stacked inductor electrically connected by a via electrode along a stacking direction.

The method of claim 1,
The sheet includes a first sheet disposed on the uppermost side of the sheet on which the internal electrodes are formed, a second sheet disposed on the lowermost side, and at least one inner sheet disposed between the first sheet and the second sheet. ,
The connection reinforcing pattern is a stacked inductor is formed on the internal electrodes formed on the first sheet and the second sheet.

The method of claim 7, wherein
The internal electrodes formed on the first sheet and the second sheet have connection electrodes extending along one edge of the main body,
The connection reinforcement pattern is a multilayer inductor is formed to extend from the connection electrode toward the external electrode.

9. The method according to claim 7 or 8,
The connection reinforcing pattern is a stacked inductor is formed on at least a portion of the inner sheet which is sequentially laminated from one surface of the first sheet and the second sheet, respectively.

10. The method of claim 9,
The connection reinforcement pattern is a stacked inductor electrically connected by a via electrode along a stacking direction.