KR20150089211A

KR20150089211A - Chip-type Coil Component

Info

Publication number: KR20150089211A
Application number: KR1020140009552A
Authority: KR
Inventors: 이정철
Original assignee: 삼성전기주식회사
Priority date: 2014-01-27
Filing date: 2014-01-27
Publication date: 2015-08-05

Abstract

A body formed by stacking a plurality of magnetic body layers and having a lower face provided with a mounting face and an upper face corresponding thereto, both side faces in the longitudinal direction and both lateral faces in the width direction; A conductor pattern formed on the magnetic body layer and connected to have a coil structure; Side external electrodes formed on both longitudinal sides of the main body; And a bottom outer electrode formed on the bottom surface of the main body and divided into arbitrary pieces at both ends in the longitudinal direction, thereby minimizing the mounting height.

Description

Chip-type Coil Component [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip-type coil component, and more particularly, to a chip-type coil component having a bottom surface external electrode divided into arbitrary pieces.

An inductor is one of the important passive components of an electronic circuit together with a resistor and a capacitor, and can be used for a component removing noise or forming an LC resonance circuit.

Such an inductor can be classified into various types such as a wound-type or thin-film type inductor and a stacked-type inductor according to its structure.

The wound or thin film type inductor may be manufactured by winding a coil on a ferrite core or by printing and forming electrodes at both ends.

The multilayer inductor may be manufactured by printing a conductive pattern on a plurality of sheets of magnetic material, dielectric, or the like, and then stacking the conductive patterns along the thickness direction.

In particular, such a multilayer inductor has advantages in that it can be downsized and reduced in thickness as compared with the above-mentioned wound type inductor, and is also advantageous in direct current resistance, so that it is widely used in a power supply circuit requiring miniaturization and high current.

On the other hand, in accordance with the tendency of electronic products to be made smaller and thinner, requirements for lowering the height of an inductor mounted on a substrate are also increasing. At this time, a method of lowering the height of the inductor main body can be considered, but there is a limit in reducing the height of the main body in connection with the performance of the inductor.

Therefore, a method of reducing the height of the external electrode provided on the lower surface of the inductor can be considered. On the other hand, since the external electrode must have a high fixing force with the inductor main body, a small amount of glass is added to the silver (Ag) paste and formed by a screen printing method. However, such a screen printing method has a problem that the printing thickness can not be lowered to 25 탆 or less due to its nature.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is to provide a chip-type coil component having external electrodes at the bottom divided into arbitrary pieces.

A chip-type coil component according to the present invention is a chip-type coil component formed by stacking a plurality of magnetic body layers and having a lower surface provided with a mounting surface and an upper surface corresponding to the lower surface, both side surfaces in the longitudinal direction and both side surfaces in the width direction, A side external electrode formed on both sides in the longitudinal direction of the main body, and a bottom external electrode formed by dividing into arbitrary pieces at both ends in the longitudinal direction of the main body, can do.

In the chip-type coil component according to the present invention, the lower surface external electrodes may be formed by being divided into a checkered pattern.

In the chip-type coil component according to the present invention, at least one piece of the lower outer electrode may be connected to the lateral outer electrode.

In the chip-type coil component according to the present invention, the lower external electrode may have a trapezoidal shape whose width gradually decreases from both ends in the longitudinal direction to the center.

In the chip-type coil component according to the present invention, the side external electrodes may be additionally formed on both sides in the width direction of the main body.

According to the present invention, it is possible to minimize the height at which chip-type coil components are mounted on a substrate by providing a chip-type coil component having external electrodes at the bottom divided into arbitrary pieces.

1 is a perspective view of a chip-type coil component according to an embodiment of the present invention;
2 is an exploded perspective view of a chip-type coil component according to an embodiment of the present invention;
3 is a cross-sectional view taken along line A-A 'in Fig.
4 is a bottom view of a chip-type coil component according to an embodiment of the present invention.
5 is a perspective view of a chip-type coil component according to another embodiment of the present invention;

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. 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.

In the following description, the same reference numerals are used to designate the same components in the same reference numerals in the drawings.

FIG. 1 is a perspective view of a chip-type coil component 100 according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a chip-type coil component 100 according to an embodiment of the present invention, Fig. 4 is a bottom view of a chip-type coil component 100 according to an embodiment of the present invention.

L, W and T denote the longitudinal direction, the width direction and the thickness direction, respectively, as shown in the figure, when directions are defined to clearly explain the embodiment of the present invention. Here, the dimension in the longitudinal direction of the chip-type coil component 100 may be larger than the dimension in the width direction. Further, the thickness direction can be used in the same concept as the lamination direction in which the magnetic substance layers 111 are laminated.

1 to 4, a chip-type coil component 100 according to an embodiment of the present invention includes a body 110 formed by stacking a plurality of magnetic material layers 111, a plurality of magnetic material layers 111 formed on the magnetic material layer 111, A plurality of via electrodes 130 connecting the conductor patterns 121, 122 and 123 and the conductor patterns 121, 122 and 123 to form coils; An electrode 140 and a bottom outer electrode 150 formed at both ends of the lower surface of the main body 110 in the longitudinal direction.

The main body 110 may be formed by stacking a plurality of magnetic substance layers 111 and then firing, and may have a lower surface provided with a mounting surface, upper surfaces corresponding to the mounting surface, both side surfaces in the longitudinal direction and both side surfaces in the width direction .

The magnetic material layer 111 may be a sheet made of a magnetic material powder. The magnetic material powder may be mixed with a binder or the like in a solvent, and then the magnetic material powder may be uniformly dispersed in the solvent through ball milling or the like. Or the like.

At this time, upper and lower cover layers 112 and 113 are formed on the upper and lower surfaces of the main body 110 to protect the plurality of conductor patterns 121, 122 and 123 printed inside the main body 110 . The upper and lower cover layers 112 and 113 may be formed by laminating a single or a plurality of dielectric layers formed of a ferrite sheet in the thickness direction.

The conductor patterns 121, 122, and 123 may be formed by printing a conductive paste containing a conductive metal to a predetermined thickness on each of the magnetic layer 111.

For example, the conductor patterns 121, 122 and 123 may be made of a material containing silver (Ag), copper (Cu), or an alloy thereof. However, the present invention is not limited thereto.

The total number of stacked layers of the magnetic layers 111 formed with the conductor patterns 121, 122, and 123 may be variously determined in consideration of electrical characteristics such as inductance values required for the chip-type coil component 100 to be designed .

At least two of the conductor patterns 121, 122 and 123 are formed of first and second connection patterns 121 and 122 having lead portions led out through the side surface in the longitudinal direction of the main body 110, .

The lead portions may be electrically connected to the side external electrodes 140 formed on both sides of the main body 110 in the longitudinal direction.

The via-electrode 130 may be formed by filling a via hole formed in the magnetic substance layer 111 with a conductive paste having excellent electrical conductivity.

The conductive paste may be composed of at least one of silver (Ag), silver-palladium (Ag-Pd), nickel (Ni) and copper (Cu), or an alloy thereof, .

The side external electrodes 140 are formed on both sides of the main body 110 in the longitudinal direction and electrically connected to both ends of the coil, that is, lead portions led out to the outside of the first and second connection patterns 121 and 122, Lt; / RTI >

The side external electrodes 140 may be formed of a conductive metal material having excellent electrical conductivity.

For example, the side external electrode 140 may be made of a material including at least one of silver (Ag) and copper (Cu), or an alloy thereof, but the present invention is not limited thereto.

In addition, a nickel (Ni) layer (not shown) and a tin (Sn) layer (not shown) may be sequentially formed on the outer surface of the side external electrode 140 from the inside as necessary.

3, the external electrode 150 may be divided into arbitrary pieces.

At this time, the external electrode 150 may be divided into a checkerboard shape, and at least one piece may be electrically connected to the external electrode 140.

In addition, the outer electrode 150 may have a trapezoidal shape in which the width gradually decreases from both ends in the longitudinal direction toward the center. The term " trapezoidal shape " as used herein refers not to a trapezoidal geometric definition, but to a shape in which the width gradually decreases from both end portions in the longitudinal direction to the center. It is possible to prevent the solder from protruding outward in the width direction of the body portion 110 when mounted on a substrate or the like.

The external electrode 150 may be made of a conductive metal material having excellent electrical conductivity, as in the case of the side external electrode 140.

For example, the outer electrode 150 may be made of a material containing at least one of silver (Ag) and copper (Cu), or an alloy thereof. However, the present invention is not limited thereto.

In addition, the external electrode 150 may be formed by adding a small amount of glass to improve adhesion of the external electrode 150 to the body 110.

As described above, the lower external electrode 150 formed by dividing into arbitrary pieces can be formed by screen printing.

When forming the external electrode 150 by screen printing, it is very difficult to reduce the thickness of the external electrode 150 to 25 mu m or less in the case of forming the external electrode 150 as an integral unit not divided into pieces. However, The external electrode 150 can be formed with a thickness of less than 12 占 퐉, that is, less than half the thickness of the integrated body.

5 is a perspective view of a chip-type coil component 200 according to another embodiment of the present invention.

5, in the chip-type coil component 200 according to another embodiment of the present invention, the lateral external electrodes 240 may be additionally formed on both sides of the body 210 in the width direction.

Components other than the side external electrodes 240 are the same as those of the chip-type coil component 200 according to the embodiment of the present invention, and detailed description thereof will be omitted.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. And will be apparent to those skilled in the art.

100, 200: chip type coil parts
110, 210:
121, 122, 123: Conductor pattern
130: Via electrode
140, 240: side external electrode
150, 250: When the external electrode

Claims

A body formed by stacking a plurality of magnetic body layers and having a lower face provided with a mounting face and an upper face corresponding thereto, both side faces in the longitudinal direction and both lateral faces in the width direction;
A conductor pattern formed on the magnetic body layer and connected to have a coil structure;
Side external electrodes formed on both longitudinal sides of the main body; And
And a lower outer electrode formed on the lower surface of the main body so as to be divided into arbitrary pieces at both ends in the longitudinal direction.

The method according to claim 1,
The chip-type coil part formed by dividing the external electrode into a checkered pattern.

The method according to claim 1,
Wherein at least one piece of the outer electrode is connected to the lateral outer electrode.

The method according to claim 1,
Wherein the outer electrode has a trapezoidal shape whose width gradually decreases from both ends in the longitudinal direction toward the center.

The method according to claim 1,
Wherein the side external electrodes are additionally formed on both sides in the width direction of the main body.