JP3329487B2 - Composite inductor components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor component, and more particularly to a composite inductor component in which a plurality of inductor portions are provided in a ferrite laminate.

[0002]

2. Description of the Related Art Conventionally, as a noise removing interface (noise removing filter element) used for an interface line of OA equipment such as a computer, for example,
A composite inductor component as shown in FIG. 4 is used. This composite inductor component has a band-shaped straight internal electrode (straight internal electrode) between layers of a ferrite laminate 21 formed by laminating a plurality of ferrite layers so that a mounting area can be reduced and high-density mounting can be performed. electrode)
22 (four in this conventional example) and a plurality of external electrodes 23 electrically connected to each straight internal electrode 22 on the outside of the ferrite laminate 21. Is a composite inductor component.

[0003]

However, in the above-mentioned conventional composite inductor component, the internal electrodes (straight internal electrodes) 22 provided between the layers of the ferrite laminate 21 are not provided.
Is formed in a belt-like and straight shape, so that a high impedance cannot be obtained and a sufficient noise removing effect cannot be obtained.

The present invention has been made to solve the above-mentioned problems, and it is possible to obtain a high impedance without hindering miniaturization and the resulting high density of mounting (surface mounting). It is an object of the present invention to provide a composite inductor component having the same.

[0005]

In order to achieve the above object, a composite inductor component according to the present invention comprises a coil formed by alternately laminating ferrite layers and internal electrode layers and conducting each internal electrode layer. The cross-sectional shape perpendicular to the axis is
A plurality of inductor portions made of a substantially rectangular coil conductor are formed on the same plane inside the ferrite laminate , and the sides facing each other in parallel with each other between adjacent inductor portions.
So that each inductor portion is alternately arranged one by one on one side and the other side of the ferrite laminate, and on the surface of the ferrite laminate, It is characterized in that a plurality of external electrodes that are electrically connected to each inductor section are formed.

[0006]

[Action] on the same plane of the ferrite stack section, the inductor section Nitsu that a plurality of inductor unit cross section perpendicular to the coil axis is a coil conductor substantially rectangular, adjacent
The fate laminates are alternately arranged one by one on one side and the other side (ie, in a zigzag shape) so that sides facing each other do not substantially occur. It is possible to reduce the size of the product and increase the mounting density, and to obtain high impedance because each inductor section is formed from a coil conductor whose cross section orthogonal to the coil axis is substantially square. In addition to this, the impedance characteristic can be adjusted by changing the number of turns of the coil, so that the degree of freedom in design is improved and noise can be effectively removed.

Further, since the inductor portions are arranged in a zigzag shape, the distance between adjacent inductor portions can be made larger than when the inductor portions are arranged in a straight line on the same plane. become.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a composite inductor component according to one embodiment of the present invention, and FIG. 2 is a plan view thereof.

The composite inductor component of this embodiment is shown in FIG.
As shown in FIG. 3, a plurality (four in this embodiment) of inductor portions 2 formed by forming the internal electrode layer 12 (FIG. 3) into a coil shape having a substantially square cross section orthogonal to the coil axis,
A plurality of ferrite layers 11 (FIG. 3) are provided inside the ferrite laminate 1, which is laminated, and are provided outside the ferrite laminate 1 with the above-described inductor sections 2 through the lead-out electrode sections 13. Are formed by arranging the external electrodes 3. Then, as shown in FIG. 2, the inductor portions 2 are arranged on the same plane inside the ferrite laminate 1 so that the adjacent inductor portions 2 and 2 face each other.
The ferrite laminate 1 is alternately moved to one side 1a side and the other side 1b side of the ferrite laminate 1 one by one so that substantially no opposing sides are engaged (that is, when viewed from the top side). , So that the lines connecting the inductor sections 2 are in a zigzag shape).

Next, a method of manufacturing the composite inductor component will be described with reference to FIG. First, a conductor pattern (internal electrode layer) 12 is provided at a position where an inductor portion 2 (FIG. 1) of a plurality of ferrite sheets (ferrite layers) 11 having through holes 14 formed at predetermined positions is to be formed. At this time, the conductor patterns 12 are alternately arranged one by one on different long sides of the ferrite sheet 11. In addition,
The conductive pattern (internal electrode layer) 12 can be formed, for example, by printing a conductive paste on an unfired ferrite green sheet so as to have a predetermined pattern.

Then, a plurality of ferrite sheets 11
The ferrite sheets 15 on which the conductor patterns on the upper and lower surfaces are not formed are laminated and crimped, and the conductor patterns 12 formed on the respective ferrite sheets 11 are connected through the through-holes 14, so that the entirety is predetermined. The coil pattern (inductor portion) 2 having the number of turns (several turns) is formed. Note that the lead electrode portion 13 is formed integrally with each of the uppermost and lowermost conductor patterns 12a and 12b of the conductor pattern 12. Next, a block in which a plurality of such units are formed is cut at a predetermined position and fired. Then, on the outside of the fired ferrite laminate 1,
A plurality of external electrodes 3 electrically connected to the inductor portion 2 through the external electrodes 3
Is formed, a composite inductor component as shown in FIG. 1 is formed. The external electrode 3 can be formed, for example, by printing and printing the same or a different conductive paste as that used to form the internal electrode layer 12, and by plating or vapor deposition. It can be formed by other methods.

In the composite inductor component formed as described above, the plurality of inductor portions 2 are formed in a coil shape by laminating the internal electrode layers 12 and connecting the internal electrode layers 12 through the through holes 14. And forming each inductor part 2 with adjacent inductor parts 2 , 2.
Are arranged alternately one by one on one side 1a side and the other side 1b side of the ferrite laminate 1 so that sides facing each other do not substantially occur. In addition, high impedance characteristics can be obtained without hindering the increase in mounting density, thereby improving the noise removing effect. Further, since the impedance characteristics can be adjusted by changing the number of turns of the coil, noise can be effectively removed.

Further, since the inductor portions 2 are alternately arranged one by one on the different side surface 1a or 1b side of the ferrite laminate 1, each inductor portion 2 is located at the same position inside the ferrite laminate 1. Compared to the case of arranging in a line on a plane, it is possible to increase the distance between the adjacent inductor parts 2, suppress magnetic coupling and capacitive coupling, improve crosstalk characteristics, and reduce noise and signals. It is possible to prevent jumping to another inductor portion and improve the reliability of signal transmission.

In the above embodiment, a composite inductor component in which four inductor portions are provided inside a ferrite laminate has been described. However, the number of inductor portions to be provided is not particularly limited. It is possible to increase or decrease the number according to the application and the use.

The number of turns (turn number) of the coil pattern constituting the inductor section is not particularly limited, and a preferable number of turns can be selected in consideration of use conditions and applications.

Also, various applications can be applied to the materials and shapes of the ferrite layer, the internal electrode layer, the external electrode, and the like as long as the effects of the present invention are not impaired.

[0017]

As described above, according to the composite inductor component of the present invention, a plurality of inductor portions made of a coil conductor having a substantially quadrangular cross section orthogonal to the coil axis are formed on the same plane inside the ferrite laminate. , the inductor section adjacent
Then , the ferrite laminates are alternately arranged one by one toward one side and the other side (ie, in a zigzag shape) so that substantially no opposing sides face each other. This makes it possible to reduce the size of the product and increase the mounting density, and since each inductor is formed from a coil conductor, it is possible to obtain high impedance and change the number of coil turns. Thus, the impedance characteristics can be adjusted, the degree of design freedom is high, and noise can be effectively removed.

[0018]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a composite inductor component according to one embodiment of the present invention.

FIG. 2 is a plan view showing a composite inductor component according to one embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a method for manufacturing a composite inductor component according to one embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional composite inductor component.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ferrite laminated body 1a One side of ferrite laminated body 1b The other side of ferrite laminated body 2 Inductor part 3 External electrode 11 Ferrite layer (ferrite sheet) 12 Internal electrode layer 13 Leading electrode part

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Claims (1)

(57) [Claims] 1. A plurality of inductor portions formed by alternately laminating a ferrite layer and an internal electrode layer and conducting each internal electrode layer, and formed by a coil conductor having a substantially square cross section orthogonal to the coil axis. On the same plane inside the ferrite laminate ,
The inductors are alternately arranged one by one on one side and the other side of the ferrite laminate so that there is substantially no side facing the outside of the ferrite laminate. A plurality of external electrodes that are electrically connected to each inductor portion.