KR20140141170A

KR20140141170A - Multi-layered inductor

Info

Publication number: KR20140141170A
Application number: KR1020130062603A
Authority: KR
Inventors: 김호윤; 한진우
Original assignee: 삼성전기주식회사
Priority date: 2013-05-31
Filing date: 2013-05-31
Publication date: 2014-12-10

Abstract

The present invention provides a multilayered inductor which includes a body on which a plurality of magnetic layers are stacked in a width direction, a plurality of first and second internal electrode patterns which are alternatively arranged to face each other by interposing the magnetic layer and are drawn to the separated position of the lower side of the body, and first and second external electrodes which are separately formed on the lower side of the body and are electrically connected to the first and second internal electrode patterns.

Description

[0001] MULTI-LAYERED INDUCTOR [0002]

The present invention relates to a stacked inductor.

Electronic components using ceramic materials include capacitors, inductors, piezoelectric elements, varistors and thermistors.

An inductor, one of these ceramic electronic components, is one of important passive elements forming an electronic circuit together with a resistor and a capacitor, and is used for a component removing noise or forming an LC resonant circuit.

The inductor includes a winding-type or thin-film type inductor which is manufactured by winding a coil on a ferrite core according to the structure, or by printing a coil on both ends of the ferrite core, and a thin film type inductor, And a stacked inductor manufactured by stacking a plurality of stacked inductors.

Among them, the multilayered inductor has advantages such as miniaturization and thickness reduction of the product compared with the wound type inductor, and also advantageous for improving the DC resistance, so that it is mainly used for a power supply circuit requiring miniaturization and high current of the product.

In general, a stacked inductor has a structure in which a punching hole is formed at an end of each internal electrode pattern to connect stacked internal electrode patterns, and via-electrodes are printed in the punching holes.

However, in such a structure, since the via-printing is required for each of the internal electrode patterns, there are troublesome manufacturing steps. In order for the via electrodes to stably connect all the internal electrode patterns, Therefore, in this case, there is a problem that loss to the inner side of the coil occurs.

In addition, in the conventional multilayer inductor, the cross-sectional area of the coil is small by forming the width-thickness surface having the smallest area among the top and bottom surfaces, the end surface and the side surface of the main body as the lamination surface of the internal electrode pattern, The number of turns of the coil must be increased to increase the size of the product.

The following Patent Document 1 discloses a bottom mount type inductor, but does not disclose a structure in which a magnetic substance layer and an internal electrode pattern are laminated in the width direction.

Korean Published Patent No. 2012-0122590

In the art, there is a demand for a new method for eliminating the via printing process, simplifying the manufacturing process, solving the problem of the loss to the inner side of the coil, and the problem of the narrow coil cross-sectional area in the multilayer inductor.

According to an aspect of the present invention, there is provided a magnetic head comprising: a main body in which a plurality of magnetic material layers are stacked in a width direction; A plurality of first and second internal electrode patterns alternately arranged so as to face each other with the magnetic material layer interposed therebetween and drawn out to positions spaced apart from each other; First and second external electrodes electrically connected to the first and second internal electrode patterns, the first and second external electrodes being spaced apart from each other on the bottom surface of the main body; The present invention provides a stacked inductor comprising:

In one embodiment of the present invention, the lower surface of the main body may be a surface mounted on the substrate.

In one embodiment of the present invention, a cover layer may be further formed on both sides of the main body.

In one embodiment of the present invention, the first and second internal electrode patterns may have a loop shape as much as possible along the periphery of the magnetic layer.

In one embodiment of the present invention, the first and second external electrodes may be formed spaced apart from the edge of the bottom surface of the main body.

According to one embodiment of the present invention, the size of a product can be reduced by laminating magnetic layers in the width direction to widen the cross-sectional area of the coil formed by the internal electrode pattern and reduce the number of laminated internal electrode patterns for the same capacity, The pattern is designed to be drawn out to the lower surface of the main body, and the via printing for connecting the internal electrode pattern is omitted, thereby preventing loss to the inner side of the coil and simplifying the manufacturing process.

1 is a perspective view showing a bottom surface of a multilayer inductor according to an embodiment of the present invention.
2 is an exploded perspective view showing a structure in which a magnetic layer and an internal electrode pattern of a multilayer inductor according to an embodiment of the present invention are formed.
3 is an exploded perspective view showing the lower surface of the multilayer inductor according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to 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 to more fully explain the present invention to those skilled in the art.

The shape and size of elements in the drawings may be exaggerated for clarity.

In the drawings, like reference numerals are used to designate like elements that are functionally equivalent to the same reference numerals in the drawings.

FIG. 1 is a perspective view showing a bottom surface of a multilayer inductor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a structure in which a magnetic layer and an internal electrode pattern of a multilayer inductor according to an embodiment of the present invention are formed. And FIG. 3 is an exploded perspective view showing the lower surface of the stacked inductor according to the embodiment of the present invention.

When directions are defined to clearly explain the embodiment of the present invention, L, W and T denoted on the drawing indicate the longitudinal direction, the width direction and the thickness direction, respectively. Here, the width direction can be used in the same concept as the lamination direction in which the magnetic material layers are laminated.

1 to 3, a multilayer inductor 100 according to an embodiment of the present invention includes a main body 110, first and second internal electrode patterns 121 and 122, (131, 132).

The main body 110 is formed by laminating a plurality of magnetic body layers 111 and 112 in the width direction and then firing such that the shape and dimensions of the main body 110 and the number of laminated layers of the magnetic body layers 111 and 112 The present invention is not limited thereto.

When the magnetic layers 111 and 112 are laminated in the width direction, the length-thickness plane is used as the lamination plane. Therefore, compared with the conventional width-thickness plane used as the lamination plane, the cross- The number of stacked internal electrode patterns can be reduced and the size of the product can be reduced.

A plurality of magnetic material layers 111 and 112 forming the main body 110 are in a sintered state and a boundary between adjacent magnetic material layers 111 and 112 is formed by using a scanning electron microscope It can be integrated so that it is difficult to confirm it.

The shape of the main body 110 is not particularly limited, and may have a hexahedral shape, for example.

In the present embodiment, for convenience of explanation, the thickness direction facing surfaces of the main body 110 are referred to as upper and lower surfaces, the surfaces in the longitudinal direction connecting the upper and lower surfaces are opposite to each other in the longitudinal direction, And the side in the width direction is defined as both sides.

At least one cover layer 113 may be formed on both sides of the main body 110 in the width direction.

The cover layer 113 may have the same material and configuration as the magnetic substance layers 111 and 112 except that it does not include the internal electrode pattern.

The cover layer 113 can basically prevent damage to the first and second internal electrode patterns 121 and 122 due to physical or chemical stress.

The magnetic material layers 111 and 112 may be sheets made of a magnetic material. The magnetic material layers 111 and 112 may be formed by mixing a ceramic magnetic material powder such as ferrite with a binder in a solvent, It may be uniformly dispersed in the solvent and then formed into a thin magnetic sheet through a method such as a doctor blade.

The first and second internal electrode patterns 121 and 122 have different polarities and constitute a coil that implements inductance. A conductive paste containing a conductive metal with a predetermined thickness is printed on the magnetic material layers 111 and 112 .

The first and second internal electrode patterns 121 and 122 are alternately arranged so as to face each other with the magnetic material layers 111 and 112 interposed therebetween. The magnetic material layers 111 and 112, Lt; / RTI >

At this time, the first and second internal electrode patterns 121 and 122 are drawn out to the lower surface of the main body 110, respectively, and one end of the first and second internal electrode patterns 121 and 122 is led out from the lower surface of the main body 110, The electrode structure is formed, so that a separate via printing for connecting adjacent internal electrode patterns is not required.

The first and second internal electrode patterns 121 and 122 can be formed in a loop shape as much as possible along the periphery of the magnetic substance layers 111 and 112 without having to form the other end portions toward the coil inner diameter. It is possible to minimize the loss with the inner coil and improve the inductance of the multilayer inductor 100.

In addition, since the length of the portion of the first and second internal electrode patterns 121 and 122 drawn out to the outside is minimized by this structure, the DC resistance characteristic can be improved.

The thickness and the number of the first and second internal electrode patterns 121 and 122 may be variously determined according to electrical characteristics such as inductance values required by the multilayer inductor 100.

The conductive metal included in the conductive paste forming the first and second internal electrode patterns 121 and 122 is at least one selected from the group consisting of silver (Ag), palladium (Pd), platinum (Pt), nickel (Ni) Or an alloy thereof, and the present invention is not limited thereto.

The conductive paste may be printed by a screen printing method or a gravure printing method, but the present invention is not limited thereto.

The first and second external electrodes 131 and 132 are spaced apart from each other on the bottom surface of the main body 110 to provide a bottom mounting surface and a plurality of first and second internal electrode patterns 121 and 122 And are electrically connected to the first and second internal electrode patterns 121 and 122, respectively, at a position corresponding to the drawn-out portion along the width direction of the main body 110. That is, the lower surface of the main body 110 may be a mounting surface on which the printed circuit board is mounted.

At this time, the first and second external electrodes 131 and 132 may be spaced apart from the bottom of the main body 110.

The first and second external electrodes 131 and 132 may be formed of a conductive paste containing a conductive metal and the conductive metal may be silver (Ag), nickel (Ni), copper (Cu) And the present invention is not limited thereto.

On the other hand, a plating layer (not shown) may be formed on the first and second external electrodes 131 and 132 if necessary.

The plating layer is intended to increase the mutual bonding strength when the multilayer inductor 100 is mounted on a printed circuit board with solder.

The plating layer may be formed of, for example, a nickel (Ni) plating layer formed on the first and second external electrodes 131 and 132 and a tin (Sn) plating layer formed on the nickel plating layer. But is not limited thereto.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, and that various changes and modifications may be made therein without departing from the scope of the invention. It will be obvious to those of ordinary skill in the art.

100; A stacked inductor 110; Body
111, 112; A magnetic body layer 113; Cover layer
121, 122; First and second internal electrode patterns 131 and 132, The first and second outer electrodes

Claims

A body in which a plurality of magnetic substance layers are stacked in a width direction;
A plurality of first and second internal electrode patterns alternately arranged so as to face each other with the magnetic material layer interposed therebetween and drawn out to positions spaced apart from each other; And
First and second external electrodes electrically connected to the first and second internal electrode patterns, the first and second external electrodes being spaced apart from each other on the bottom surface of the body; Lt; / RTI >

The method according to claim 1,
Wherein the main body bottom surface is a surface mounted on the substrate.

The method according to claim 1,
And a cover layer formed on both side surfaces of the main body.

The method according to claim 1,
Wherein the first and second internal electrode patterns are loop-shaped as much as possible along the periphery of the magnetic layer.

The method according to claim 1,
Wherein the first and second external electrodes are spaced apart from an edge of the bottom surface of the main body.