JPH05326270A - Composite inductor part - Google Patents

Abstract

PURPOSE:To enhance noise removing capability by giving high impedance to an inductance part without preventing miniaturization or high concentration mounting. CONSTITUTION:A ferrite layer and an internal electrode layer are mutually laminated and a current passes through each internal electrode layer in order to form an inductor part 2 having a plurality of coil shapes arranged on the same plane inside the ferrite laminated body 1 so that a distance between the adjoining inductor parts 2 can enlarge and each of the inductor parts 2 can come relatively close alternatively one by one to one side surface 1a side and the other side surface 1b side of the ferrite laminated body 1, and also a plurality of external electrodes 3 which are electrically connected to each inductor part 2 are formed outside the ferrite laminated body 1.

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 parts are arranged in a ferrite laminate.

[0002]

2. Description of the Related Art Conventionally, as a noise elimination interface (noise elimination 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 strip-shaped straight internal electrode (straight internal electrode) between the layers of a ferrite laminate 21 formed by laminating a plurality of ferrite layers so that the mounting area can be reduced and high-density mounting can be performed. electrode)
An integral firing type formed by arranging a plurality of 22 (4 in this conventional example) and a plurality of external electrodes 23 electrically connected to the respective straight internal electrodes 22 outside the ferrite laminate 21. Is a composite inductor component of.

[0003]

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

The present invention solves the above-mentioned problems, and it is possible to obtain a high impedance without hindering the miniaturization and the high density of mounting (surface mounting) by it, and it is possible to obtain an excellent noise removing effect. It is an object of the present invention to provide a composite inductor component having the above.

[0005]

In order to achieve the above object, a composite inductor component of the present invention comprises a plurality of layers formed by alternately laminating ferrite layers and internal electrode layers and conducting each internal electrode layer. Place the coil-shaped inductor parts on the same plane inside the ferrite laminate, alternating one inductor part at a time so that the distance between adjacent inductor parts is large, and It is characterized in that the plurality of external electrodes, which are arranged close to the side surface and are electrically connected to the respective inductor parts, are formed outside the ferrite laminate.

[0006]

[Function] On the same plane inside the ferrite laminated body, the inductor portions are alternately shifted one by one to one side surface side and the other side surface side of the ferrite laminated body (that is, in a zigzag shape).
Since it is arranged, the product can be miniaturized to achieve high packaging density, and since each inductor part is formed in a coil shape, high impedance can be obtained and the coil It is possible to adjust the impedance characteristics by changing the number of turns of
The degree of freedom in design is improved, and noise can be effectively removed.

Further, since the inductor parts are arranged in a zigzag shape, the distance between the adjacent inductor parts can be increased as compared with the case where the inductor parts are arranged in a straight line on the same plane. Therefore, it is possible to suppress the porcelain coupling and the capacitive coupling, improve the crosstalk characteristics, prevent noise and signals from jumping to other inductor portions, and improve the reliability of signal transmission.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing a composite inductor component according to an 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 of (four in this embodiment) inductor portions 2 formed by forming the internal electrode layers 12 (FIG. 3) in a coil shape are laminated with ferrite layers 11 (FIG. 3). It is formed by arranging it inside the laminated body 1 and, on the outside of the ferrite laminated body 1, a plurality of external electrodes 3 which are electrically connected to the above-mentioned inductor portions 2 through the lead electrode portions 13. There is. Then, as shown in FIG. 2, the inductor portions 2 are alternately arranged one by one on the same plane inside the ferrite laminated body 1 toward the side surface 1a side and the other side surface 1b side of the ferrite laminated body 1. Position (that is, when viewed from the top side, each inductor portion 2
Are arranged so that the line connecting them becomes zigzag.

Next, a method of manufacturing this composite inductor component will be described with reference to FIG. First, a conductor pattern (internal electrode layer) 12 is arranged at a position where the 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 conductor pattern (internal electrode layer) 12 can be formed, for example, by printing an unbaked ferrite green sheet with a conductive paste so as to form a predetermined pattern.

Then, a plurality of ferrite sheets 11
And the ferrite sheets 15 on which conductor patterns on the upper and lower sides thereof are not formed are laminated and pressure-bonded, and the conductor patterns 12 formed on each ferrite sheet 11 are connected through the through holes 14, whereby a predetermined overall pattern is obtained. The coil pattern (inductor portion) 2 having the number of turns (several turns) is formed. Note that the lead electrode portions 13 are integrally formed on the uppermost and lowermost conductor patterns 12a and 12b of the conductor pattern 12, respectively. 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, the extraction electrode portion 1
A plurality of external electrodes 3 that are electrically connected to the inductor section 2 via
By forming, the composite inductor component as shown in FIG. 1 is formed. The external electrode 3 can be formed, for example, by printing and baking a conductive paste that is the same as or different from that used to form the internal electrode layer 12, or 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 coiled by stacking the internal electrode layers 12 and connecting the internal electrode layers 12 through the through holes 14. Since the inductor portions 2 are formed one by one and are alternately arranged close to one side surface 1a side and the other side surface 1b side of the ferrite laminate 1, downsizing and high mounting density by the same can be achieved. It is possible to bring out a high impedance characteristic without disturbing the noise and improve the noise removing effect. Moreover, since the impedance characteristic 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 toward the different side faces 1a or 1b of the ferrite laminated body 1, the inductor portions 2 are arranged inside the ferrite laminated body 1 in the same manner. Compared to the case where they are arranged in a line on a plane, it is possible to increase the distance between the adjacent inductor portions 2, suppress the porcelain coupling and the capacitive coupling, improve the crosstalk characteristics, and reduce noise and signals. The reliability of signal transmission can be improved by preventing jumping to another inductor section.

In the above embodiment, the composite inductor component in which four inductor parts are arranged inside the ferrite laminate is described, but there is no particular limitation on the number of inductor parts to be arranged, and the usage condition is not limited. It is possible to increase or decrease the number according to the application and the like.

Further, there is no particular restriction on the shape or the number of turns (the number of turns) of the coil pattern forming the inductor portion, and a preferable shape and the number of turns can be selected in consideration of usage conditions and applications.

Further, it is possible to add various applications to the materials and shapes of the ferrite layer, the internal electrode layers, the external electrodes, etc. within a range not impairing the effects of the present invention.

[0017]

As described above, according to the composite inductor component of the present invention, each inductor portion formed in a coil shape is alternately arranged on the same plane inside the ferrite laminated body and one side surface of the ferrite laminated body. Side and the other side surface side are arranged, and a plurality of external electrodes that conduct with each inductor section are formed on the outside of the ferrite laminated body, so miniaturization and high density mounting by that are achieved. High impedance characteristics can be obtained without hindrance,
Since desired impedance characteristics can be obtained by changing the number of turns of the coil, the degree of freedom in design is improved, and noise can be effectively removed.

Further, since each inductor portion is alternately arranged at a position closer to a different side surface of the ferrite laminate, it is possible to increase the distance between the adjacent inductor portions. Crosstalk characteristics can be improved by suppressing porcelain coupling and capacitive coupling, noise and signals can be prevented from jumping to other inductor sections, and the reliability of signal transmission can be improved.

[Brief description of drawings]

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

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

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

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

[Explanation of symbols]

1 Ferrite Laminate 1a One Side of Ferrite Laminate 1b Other Side of Ferrite Laminate 2 Inductor Part 3 External Electrode 11 Ferrite Layer (Ferrite Sheet) 12 Internal Electrode Layer 13 Lead-out Electrode Part

Claims (1)

[Claims] 1. A plurality of coil-shaped inductor portions formed by alternately stacking ferrite layers and internal electrode layers and electrically connecting the internal electrode layers to each other are provided adjacent to each other on the same plane inside the ferrite laminate. In order to increase the distance between the parts, the inductor parts are alternately arranged one by one close to one side surface side and the other side surface side of the ferrite laminate, and the inductor parts are arranged outside the ferrite laminate body. A composite inductor component, comprising a plurality of external electrodes that are electrically connected to each other.